Some standard content:
National Standard of the People's Republic of China
Metal furniture--General technical requirements
Metal furniture--General technical requirementsSubject content and scope of application
This standard specifies the technical requirements and test methods for metal furniture. This standard applies to all types of metal furniture and metal parts of other furniture. 2 Reference standards
Determination of paint film adhesion
GB 1720
GB1730
Determination of paint film hardnessPendulum damping test
GB 1732
GB 1743
GB 1763
Determination of paint film impact resistance
Determination of paint film glossiness
Determination of paint film resistance to chemical reagents
GB/T 3324
GB/T 3326
GB/T3327
GB/T 3328
General technical requirements for wooden furniture
Main dimensions of tables, chairs and stools
Main dimensions of cabinets
Main dimensions of beds
GB3976Functional dimensions of school desks and chairs
GB4893.1~4893.9Determination of paint film on furniture surfaceGB5926
GB 5928
GB5933
GB 10357
Test method for appearance quality of metal coatings and chemical treatment layers of light industrial productsTest method for thickness of metal coatings and aluminum oxide films of light industrial productsWeight measurement methodTest method for bonding strength of metal coatings of light industrial productsTest for mechanical properties of furniture
ZBY80 002
ZB Y80 003
3 Terms
3.1 Verticality of adjacent edges
Determination of peel strength of soft covering materials on furniture surface Determination of peel strength of hard covering materials on furniture surface Verticality of adjacent edges refers to the degree of irregularity when the product (component) is rectangular in shape. 3.2 Horizontal deviation
Horizontal deviation refers to the degree of parallelism between the tabletop of the folding table product and the ground. 3.3 Flatness
Flatness refers to the local flatness of the product (component) surface within the range of 0 to 150 mm. 3.4 Roundness
Roundness refers to the degree of deformation of the product (component) at the bending point of the round tube by extrusion or stretching. 3.5 Position difference
GB/T3325-1995 approved by the State Administration of Technical Supervision on August 17, 1995
Replaced GB3325--82
Implemented on August 1, 1996
GB/T 3325-1995
Position difference refers to the distance between the two adjacent surfaces of the door and frame, door and door, door and drawer, drawer and frame, and drawer and drawer in the product. 4 Technical requirements
4.1 Main dimensions and limit deviations
4.1.1 The main dimensions of the product shall comply with the provisions of GB3326, GB3327, GB3328 and GB3976. 4.1.2 The limit deviations of the width, depth and height of the product are specified in Table 1. Table 1
Folding type
Non-folding type
4.1.3 The limit deviation of matching or combined products shall be positive or negative. 4.2 Shape and position tolerance
Shape and position tolerance are specified in Table 2.
Verticality of adjacent edges
Horizontal deviation
Flatness
Position difference
Stability on the ground
Specimen name and specification
Diagonal length ≤1000
Diagonal length>1000
Folding tabletop
Door, tabletop and drawer surface
Bending point of round tube
Distance deviation between two adjacent surfaces of door and frame, door and door, drawer and frame, drawer and door, drawer and drawer (not the distance required by design) Distance)
Length 300
Drawer and
Length ≥ 300
Height < 1000
Height ≥ 1000
Difference between base and horizontal plane
Limit deviation
Allowable value
Folding
Non-folding
4.3 Material requirements
GB/T3325—1995
4.3.1 The mechanical properties of the metal materials used in the product must meet the requirements of Article 4.6 of this standard. 4.3.2 The parts used in the product shall meet the following requirements: a. The moisture content of wood shall not be higher than the annual average wood equilibrium moisture content of the area where the product is used + 1%; insect-eaten wood must be treated with insecticides, and wood that is still being attacked by insects shall not be used; parts and components are not allowed to have through cracks;
25%;
The surface shall not be rotten, and the area of slight decay of the internal material shall not exceed 15% of the part area, the depth shall not exceed the thickness of the material, the width of the knot shall not exceed 1/3 of the visible material width, and the diameter shall not exceed 12mm. After repair, it will not affect the structural strength and appearance, e.
can be used;
There shall be no resin capsules in the painted or stored parts; f.
The twill degree exceeds 20% shall not be used.
4.4 Appearance requirements
The appearance of metal parts shall meet the following requirements:
No cracks are allowed in pipes and stampings;
No overlaps in pipes, no dislocation and scarring in welding; No delamination in stampings;
The difference between the height of wrinkles at the bends of round pipes and flat wire pipes shall not exceed 0.4mm, and the arc shape at the bends shall be smooth and consistent; The surface ripples of weld scars shall be uniform, and the difference between the height shall not exceed 1mm; There shall be no slag inclusions, pores, weld nodules, wire heads, undercuts and spatter at welds; Rivets shall be straight and smooth without obvious hammer marks. There shall be no burrs, cutting edges or edges in the parts that contact the human body or collect items. 4.4.3 There shall be no desoldering, cold welding or welding penetration at welds. There shall be no missing rivets or de-riveting at riveted joints.
4.4.5 The coating (plating) layer shall be free of peeling, rusting and paint sticking. 4.4.6 The exposed parts of the electroplating layer shall not be burnt, blistered, exposed bottom, pinholes, cracks, spots, obvious scratches and burrs. 4.4.7
The paint film coating of metal parts shall not be exposed bottom, uneven, bumpy, wrinkled, flying paint, color difference, obvious sagging and pattern defects. 4.4.8 The paint film coating of wooden parts shall not be exposed bottom, powder accumulation, debris, missing putty, brush hair, edge expansion, shrinkage, color difference, over-corrugation, sagging, wrinkled skin, white spots and obvious particles.
The surface appearance of wooden parts shall meet the following requirements: a.
There shall be no obvious glue penetration, depression or indentation on the veneer or plastic veneer; there shall be no missing nails or broken stubble at the joints;
The surface shall be chamfered, and the rounded corners and round lines shall be consistent; the surface roughness of wooden parts shall be R≤3.2μm (finished). All kinds of artificial board parts used shall be edge-sealed, and the edge banding strips shall not be debonded or bubbling. The veneer or plastic veneer shall not have degumming or obvious bubbling, scratches and glue marks. The opening and closing accessories shall be flexible, and the folding products shall be easy to fold without self-folding. 4.4.13 The product shall be labeled with a trademark or factory logo.
4.5 Physical and chemical properties of product surface coating and plating The physical and chemical properties of product surface coating and plating shall comply with the requirements of Table 3. 11
Baking varnish spray coating
Electroplating layer
Electrochemical layer
Paint film on wooden surface
4.6 Mechanical performance requirements
Impact strength
Corrosion resistance
Adhesion
Gloss
Binding strength
Roughness
Salt spray resistance
Chromium layer thickness
Oxide film thickness
Adhesion
Moisture and heat resistance
Resistance to cold and hot temperature difference
Gloss
GB/T 3325-
Technical indicators
≥3.92JNo peeling, cracks or wrinkles, etc.
Salt water resistance for 1hNo rust, blistering or crackingNot less than level 3
≥65%
The coating should not peel or fall off
R,≤1.25 μm
Rust spots≤20 points/dm, of which no more than 5 rust spots with a diameter of 1.5mm≥0.3 μm
≥3μm
10% sodium carbonate 24h, 30% acetic acid 24h, not less than level 3Not less than level 3
70℃16～24 h not less than level 3
paint film 2000 revolutions; impregnation paper, PVC veneer 400 revolutions, not less than level 3 temperature 40±2 (, -20±2℃, relative humidity 98%~99%, 3 cycles without blister cracks and obvious gloss loss
not less than level 3
mechanical properties test items and test levels shall be determined according to the type of specimen and the intended use conditions. 4.6.1 The strength and durability of tables shall meet the test items specified in Articles 7.1 and 7.2 of GB10357.1. 4.6.2 The stability of chairs and stools shall meet the minimum tipping force specified in Appendix A of GB10357.2 and the test items specified in Article 6.1 (or 6.2).
4.6.3 The strength and durability of chairs and stools shall meet the test items specified in Chapter 6 of GB10357.3 4.6.4 The stability of cabinets shall meet the test items specified in Articles 5.1, 5.2 and 5.3 of GB10357.4; the vertical loading forces for movable parts such as doors and drawers are 100N and 15N respectively. 4.6.5 The strength and durability of cabinets shall meet the test items specified in Chapters 6, 7 and 8 of GB10357.5; the allowable values of shelf deflection, clothes hanger deflection, clothes hanger support displacement, main structure and bottom frame displacement are as follows: a.
Ratio of shelf deflection to length ≤0.5%; ratio of clothes hanger deflection to length ≤0.4%; clothes hanger support displacement ≤3mm;
Main structure and bottom frame displacement value d≤15mm. 4.6.6
The strength and durability of single-layer beds shall meet the test items specified in Chapter 5 of GB10357.6. 4.7 Peel strength requirements
GB/T 3325—1995
4.7.1 The peel strength of soft surface materials shall not be less than 3.5×102N/m. 4.7.2 The peel strength of hard covering materials shall not be less than 1.4X103N/m. 5 Test methods
5.1 Determination of main dimensions and limit deviations
Use a 3m steel tape measure (or steel ruler) with an error of no more than ±0.6mm per meter to measure the test piece placed on a flat plate (or flat ground).
5.2 Determination of perpendicularity of adjacent sides
Use a 3m steel tape measure or steel ruler with an error of no more than ±0.6mm per meter to measure the two diagonals of the rectangular surface (component) of the product. The difference is the adjacent side perpendicularity assessment value.
5.3 Determination of horizontal deviation
Use a 3m steel tape measure or steel ruler with an error of no more than 0.6mm per meter to measure the height of the midpoint of each set of opposite sides of the square tabletop from the ground; for the round tabletop, measure the height of the highest point on the circumference and another point symmetrical through the center of the circle from the ground. The ratio of the difference to the side length or diameter is the horizontal deviation. 5.4 Determination of flatness
Use a measuring instrument with an error of no more than 0.03mm to place it on the three most severely uneven parts of the tested surface of the test piece, measure the distance between the reference straight line within a length of 0~150mm, and take the maximum value as the evaluation value. 5.5 Determination of roundness
Use a caliper with an error of no more than 0.05mm to measure the maximum and minimum diameters in the middle of the curved section of the round tube. The difference is the roundness. 5.6 Determination of position difference
A position difference measuring instrument with an error of no more than 0.1mm should be used. When measuring, the position with the largest distance between the two adjacent surfaces of the door and the frame (or the door and the door, the door and the drawer, the drawer and the frame, the drawer and the drawer crown) should be selected. One of the adjacent surfaces is selected as the measurement reference surface. The base surface of the instrument is placed on the measurement base surface. The measuring surface of the instrument is measured on the other adjacent surface (and one or more positions are measured along the adjacent surface). When all the measured values are positive (or negative), the maximum absolute value is used as the position difference measurement value; when the measured values are positive or negative, the sum of the maximum absolute values is used as the position difference measurement value, and the maximum measurement value is used as the position difference evaluation value. When the design requires a certain distance value between the two adjacent surfaces of the door (or drawer) and the frame, the distance value should be deducted from each measured value.
5.7 Split measurement
Use a plug gauge to measure the maximum gap on each side.
5.8 Determination of the stability of the foot landing
Place the test piece on a flat plate. Use a feeler gauge to measure the distance between a certain foot and the flat plate. 5.9 Determination of wood moisture content
Determination shall be carried out in accordance with Article 5.2 of GB/T3324.
5.10 Determination of wrinkles and ripples
Measure the height difference of wrinkles and weld scar ripples at the bend with a caliper or wire gauge with an error of no more than 0.05mm. 5.11 Appearance inspection
It shall be inspected by three persons under natural light or near natural light with an illumination of 300 to 6001x (e.g. 40W fluorescent lamp) at a viewing distance of 700 to 1000 mm. The same conclusion of more than two persons shall be regarded as the evaluation result. 5.12 Determination of physical and chemical properties
5.12.1 The physical and chemical properties of baking varnish (spraying) coatings shall be tested in accordance with the following provisions: Hardness shall be tested in accordance with GB1730;
b. Impact strength shall be tested in accordance with GB1732
Corrosion resistance shall be tested in accordance with the heated salt water resistance method in Article 3.2 of GB1763; c.
d. Adhesion shall be tested in accordance with GB1720;
e. Glossiness shall be tested in accordance with GB1743.
GB/T3325—1995
5.12.2 The physical and chemical properties of electroplating layers shall be tested in accordance with the following provisions: Adhesion strength shall be tested in accordance with Article 2.1 of GB5933; a.
b. The surface roughness is tested in accordance with Article 3.2 of GB5926; Salt spray test: After the surface of the test piece is degreased, it is hung in a salt spray box at an angle of 15°~30°, and 5% sodium chloride solution (prepared by dissolving chemically pure NaCI reagent in distilled water) is sprayed intermittently for 8 hours (spray for 15 minutes every hour, maintain the temperature at 35±2°C), and stored for 16 hours (natural cooling during storage), 24 hours as a cycle, the salt spray deposition rate is 1±0.5mL/h·80cm2, and the test piece is washed with clean water to remove the test solution, and the size and number of rust spots on the test piece are observed; d. The thickness of the chrome plating layer of metal parts should be determined by the timed drip method. After the surface of the test piece is degreased, the test piece, reagents and test equipment are stored at 20-25℃ for at least 3h. During the test, the test piece is placed flat, and a drop of hydrochloric acid (specific gravity 1.18) is dripped onto the surface of the chromium layer using a 0.5mm dropper; a stopwatch is used to time the reaction between the hydrochloric acid and the chromium layer until the local chromium layer is dissolved and the inner layer is exposed; according to the required time, refer to Table 4 and calculate according to the following formula:
where d is the thickness of the chromium layer - μm,
the time required to dissolve the chromium layer, s;
the thickness of the chromium layer dissolved per second, μm/s.
solution temperature, ℃
K, μm/swwW.bzxz.Net
the oxide film thickness is tested in accordance with Article 4.1 of GB5928. 5.12.3The physical and chemical properties of the paint film on the surface of wooden parts are tested in accordance with the provisions of GB4893. 5.13 Determination of mechanical properties
The strength and durability of tables shall be tested in accordance with GB10357.1. 5.13.1
The stability of chairs and stools shall be tested in accordance with GB10357.2. The strength and durability of chairs and stools shall be tested in accordance with GB10357.3. 5.13.3
Solution temperature, ℃
K, um/s
CB/T3325-1995
5.13.4 The stability of cabinets shall be tested in accordance with GB10357.4. 5.13.5 The strength and durability of cabinets shall be tested in accordance with GB10357.5. 5.13.6 The strength and durability of single-layer beds shall be tested in accordance with the provisions of GB10357.6. 5.14 Determination of peel strength
The peel strength of soft and hard covers shall be tested in accordance with the provisions of ZBY80002 and ZBY80003 respectively. 6 Marking, packaging, transportation, storage
6.1 Marking
The finished product shall be marked with the manufacturer's name (trademark), factory address and qualified mark when leaving the factory. 6.2 Packaging and transportation
The finished product shall be padded or packaged during transportation to prevent damage or rain. 6.3 Storage
The finished product shall be kept dry and ventilated during storage to prevent pollution and sunlight. Padding shall be added when stacking to prevent pressure damage. Additional remarks:
This standard is proposed by China Light Industry General Association.
This standard is under the jurisdiction of the National Furniture Standardization Center. This standard was jointly drafted by Shanghai Furniture Research Institute and Shanghai Furniture Company. The main drafters of this standard are Ding Zhaoxin and Mao Yongle.6
The strength and durability of a single-layer bed shall meet the test items specified in Chapter 5 of GB10357.6. 4.7 Peel strength requirements
GB/T 3325—1995
4.7.1 The peel strength of soft surface materials shall not be less than 3.5×102N/m. 4.7.2 The peel strength of hard surface materials shall not be less than 1.4X103N/m. 5 Test methods
5.1 Determination of main dimensions and limit deviations
Use a 3m steel tape measure (or steel ruler) with an error of no more than ±0.6mm per meter to measure the test piece placed on a flat plate (or flat ground).
5.2 Determination of verticality of adjacent sides
Use a 3m steel tape measure or steel ruler with an error of no more than ±0.6mm per meter to measure the two diagonals of the rectangular surface (component) of the product. The difference is the evaluation value of the verticality of the adjacent sides.
5.3 Determination of horizontal deviation
Use a 3m steel tape measure or steel ruler with an error of no more than ±0.6mm per meter to measure the height of the midpoint of each set of opposite sides of the square tabletop from the ground; for the round tabletop, measure the height of the highest point on the circumference and the other point symmetrical through the center of the circle from the ground. The ratio of the difference to the side length or diameter is the horizontal deviation. 5.4 Determination of flatness
Put a measuring instrument with an error of no more than 0.03mm on the three most severely uneven parts of the tested surface of the test piece, measure the distance from the reference straight line within a length of 0~150mm, and take the maximum value as the evaluation value. 5.5 Determination of roundness
Use a caliper with an error of no more than 0.05mm to measure the maximum and minimum diameters in the middle of the curved section of the round tube, and the difference is the roundness. 5.6 Determination of position difference
A position difference measuring instrument with an error of no more than 0.1mm should be used. When measuring, the part with the largest distance between the two adjacent surfaces of the door and the frame (or door and door, door and drawer, drawer and frame, drawer and drawer crown) should be selected. Among the adjacent surfaces, any one surface is selected as the measurement reference surface, and the base surface of the instrument is placed on the measurement base surface. The measuring surface of the instrument is measured on the other adjacent surface (and one or more parts are measured along the adjacent surface). When all the measured values are positive (or negative), the maximum absolute value is the position difference measurement value; when the measured values are positive or negative, the sum of the maximum absolute values is the position difference measurement value, and the maximum measured value is the position difference evaluation value. When the design requires a certain distance between the two adjacent surfaces of the door (or drawer) and the frame, the distance value should be deducted from each measured value.
5.7 Determination of gap
Use a feeler gauge to measure the maximum gap on each side.
5.8 Determination of stability of foot contact
Place the specimen on a flat plate. Use a feeler gauge to measure the distance between a certain foot and the flat plate. 5.9 Determination of wood moisture content
Determine in accordance with Article 5.2 of GB/T3324.
5.10 Determination of wrinkles and ripples
Use a caliper or wire gauge with an error of no more than 0.05mm to measure the height difference of wrinkles and weld scar ripples at the bend. 5.11 Appearance inspection
It should be inspected by three persons under natural light or near-natural light with an illumination of 300-6001x (e.g. 40W fluorescent lamp) at a viewing distance of 700-1000 mm, and the same conclusion of more than two persons shall be regarded as the evaluation result. 5.12 Determination of physical and chemical properties
5.12.1 The physical and chemical properties test of baking varnish (spraying) coating shall be carried out in accordance with the following provisions: hardness shall be tested in accordance with GB1730;
b. Impact strength shall be tested in accordance with GB1732
Corrosion resistance shall be tested in accordance with the heated salt water resistance method in Article 3.2 of GB1763;
d. Adhesion shall be tested in accordance with GB1720;
e. Glossiness shall be tested in accordance with GB1743.
GB/T3325—1995
5.12.2 The physical and chemical properties of the electroplated layer shall be tested in accordance with the following provisions: a. The bonding strength shall be tested in accordance with Article 2.1 of GB5933; b. The surface roughness shall be tested in accordance with Article 3.2 of GB5926; salt spray test: After the surface of the test piece is degreased, it shall be hung in a salt spray chamber at an angle of 15°~30°, and 5% sodium chloride solution (prepared by dissolving chemically pure NaCI reagent in distilled water) shall be sprayed intermittently for 8 hours (spraying for 15 minutes per hour, maintaining the temperature at 35±2℃), and stored for 16 hours (natural cooling during storage), 24 hours as a cycle, and the salt spray deposition rate shall be 1±0.5mL/h·80cm2. After taking out the test piece, wash the test solution with clean water, and observe the size and number of rust spots on the test piece; d. The thickness of the chrome plating layer of metal parts shall be determined by the timed drip method. After the surface of the test piece is degreased, the test piece, reagents and test equipment are stored at 20-25℃ for at least 3h. During the test, the test piece is placed flat, and a drop of hydrochloric acid (specific gravity 1.18) is dripped onto the surface of the chromium layer using a 0.5mm dropper; a stopwatch is used to time the reaction between the hydrochloric acid and the chromium layer until the local chromium layer is dissolved and the inner layer is exposed; according to the required time, refer to Table 4 and calculate according to the following formula:
where d is the thickness of the chromium layer - μm,
the time required to dissolve the chromium layer, s;
the thickness of the chromium layer dissolved per second, μm/s.
solution temperature, ℃
K, μm/s
the oxide film thickness is tested in accordance with Article 4.1 of GB5928. 5.12.3The physical and chemical properties of the paint film on the surface of wooden parts are tested in accordance with the provisions of GB4893. 5.13 Determination of mechanical properties
The strength and durability of tables shall be tested in accordance with GB10357.1. 5.13.1
The stability of chairs and stools shall be tested in accordance with GB10357.2. The strength and durability of chairs and stools shall be tested in accordance with GB10357.3. 5.13.3
Solution temperature, ℃
K, um/s
CB/T3325-1995
5.13.4 The stability of cabinets shall be tested in accordance with GB10357.4. 5.13.5 The strength and durability of cabinets shall be tested in accordance with GB10357.5. 5.13.6 The strength and durability of single-layer beds shall be tested in accordance with the provisions of GB10357.6 5.14 Determination of peeling strength
The peeling strength of soft and hard covers shall be tested in accordance with the provisions of ZBY80002 and ZBY80003 respectively. 6 Marking, packaging, transportation, storage
6.1 Marking
The finished product shall be marked with the manufacturer's name (trademark), factory address and qualified mark when leaving the factory. 6.2 Packaging and transportation
The finished product shall be padded or packaged during transportation to prevent damage or rain. 6.3 Storage
The finished product shall be kept dry and ventilated during storage to prevent pollution and sunlight. Padding shall be added when stacking to prevent pressure damage. Additional remarks:
This standard is proposed by China Light Industry General Association.
This standard is under the jurisdiction of the National Furniture Standardization Center. This standard was jointly drafted by Shanghai Furniture Research Institute and Shanghai Furniture Company. The main drafters of this standard are Ding Zhaoxin and Mao Yongle.6
The strength and durability of a single-layer bed shall meet the test items specified in Chapter 5 of GB10357.6. 4.7 Peel strength requirements
GB/T 3325—1995
4.7.1 The peel strength of soft surface materials shall not be less than 3.5×102N/m. 4.7.2 The peel strength of hard surface materials shall not be less than 1.4X103N/m. 5 Test methods
5.1 Determination of main dimensions and limit deviations
Use a 3m steel tape measure (or steel ruler) with an error of no more than ±0.6mm per meter to measure the test piece placed on a flat plate (or flat ground).
5.2 Determination of verticality of adjacent sides
Use a 3m steel tape measure or steel ruler with an error of no more than ±0.6mm per meter to measure the two diagonals of the rectangular surface (component) of the product. The difference is the evaluation value of the verticality of the adjacent sides.
5.3 Determination of horizontal deviation
Use a 3m steel tape measure or steel ruler with an error of no more than ±0.6mm per meter to measure the height of the midpoint of each set of opposite sides of the square tabletop from the ground; for the round tabletop, measure the height of the highest point on the circumference and the other point symmetrical through the center of the circle from the ground. The ratio of the difference to the side length or diameter is the horizontal deviation. 5.4 Determination of flatness
Put a measuring instrument with an error of no more than 0.03mm on the three most severely uneven parts of the tested surface of the test piece, measure the distance from the reference straight line within a length of 0~150mm, and take the maximum value as the evaluation value. 5.5 Determination of roundness
Use a caliper with an error of no more than 0.05mm to measure the maximum and minimum diameters in the middle of the curved section of the round tube, and the difference is the roundness. 5.6 Determination of position difference
A position difference measuring instrument with an error of no more than 0.1mm should be used. When measuring, the part with the largest distance between the two adjacent surfaces of the door and the frame (or door and door, door and drawer, drawer and frame, drawer and drawer crown) should be selected. Among the adjacent surfaces, any one surface is selected as the measurement reference surface, and the base surface of the instrument is placed on the measurement base surface. The measuring surface of the instrument is measured on the other adjacent surface (and one or more parts are measured along the adjacent surface). When all the measured values are positive (or negative), the maximum absolute value is the position difference measurement value; when the measured values are positive or negative, the sum of the maximum absolute values is the position difference measurement value, and the maximum measured value is the position difference evaluation value. When the design requires a certain distance between the two adjacent surfaces of the door (or drawer) and the frame, the distance value should be deducted from each measured value.
5.7 Determination of gap
Use a feeler gauge to measure the maximum gap on each side.
5.8 Determination of stability of foot contact
Place the specimen on a flat plate. Use a feeler gauge to measure the distance between a certain foot and the flat plate. 5.9 Determination of wood moisture content
Determine in accordance with Article 5.2 of GB/T3324.
5.10 Determination of wrinkles and ripples
Use a caliper or wire gauge with an error of no more than 0.05mm to measure the height difference of wrinkles and weld scar ripples at the bend. 5.11 Appearance inspection
It should be inspected by three persons under natural light or near-natural light with an illumination of 300-6001x (e.g. 40W fluorescent lamp) at a viewing distance of 700-1000 mm, and the same conclusion of more than two persons shall be regarded as the evaluation result. 5.12 Determination of physical and chemical properties
5.12.1 The physical and chemical properties test of baking varnish (spraying) coating shall be carried out in accordance with the following provisions: hardness shall be tested in accordance with GB1730;
b. Impact strength shall be tested in accordance with GB1732
Corrosion resistance shall be tested in accordance with the heated salt water resistance method in Article 3.2 of GB1763;
d. Adhesion shall be tested in accordance with GB1720;
e. Glossiness shall be tested in accordance with GB1743.
GB/T3325—1995
5.12.2 The physical and chemical properties of the electroplated layer shall be tested in accordance with the following provisions: a. The bonding strength shall be tested in accordance with Article 2.1 of GB5933; b. The surface roughness shall be tested in accordance with Article 3.2 of GB5926; salt spray test: After the surface of the test piece is degreased, it shall be hung in a salt spray chamber at an angle of 15°~30°, and 5% sodium chloride solution (prepared by dissolving chemically pure NaCI reagent in distilled water) shall be sprayed intermittently for 8 hours (spraying for 15 minutes per hour, maintaining the temperature at 35±2℃), and stored for 16 hours (natural cooling during storage), 24 hours as a cycle, and the salt spray deposition rate shall be 1±0.5mL/h·80cm2. After taking out the test piece, wash the test solution with clean water, and observe the size and number of rust spots on the test piece; d. The thickness of the chrome plating layer of metal parts shall be determined by the timed drip method. After the surface of the test piece is degreased, the test piece, reagents and test equipment are stored at 20-25℃ for at least 3h. During the test, the test piece is placed flat, and a drop of hydrochloric acid (specific gravity 1.18) is dripped onto the surface of the chromium layer using a 0.5mm dropper; a stopwatch is used to time the reaction between the hydrochloric acid and the chromium layer until the local chromium layer is dissolved and the inner layer is exposed; according to the required time, refer to Table 4 and calculate according to the following formula:
where d is the thickness of the chromium layer - μm,
the time required to dissolve the chromium layer, s;
the thickness of the chromium layer dissolved per second, μm/s.
solution temperature, ℃
K, μm/s
the oxide film thickness is tested in accordance with Article 4.1 of GB5928. 5.12.3The physical and chemical properties of the paint film on the surface of wooden parts are tested in accordance with the provisions of GB4893. 5.13 Determination of mechanical properties
The strength and durability of tables shall be tested in accordance with GB10357.1. 5.13.1
The stability of chairs and stools shall be tested in accordance with GB10357.2. The strength and durability of chairs and stools shall be tested in accordance with GB10357.3. 5.13.3
Solution temperature, ℃
K, um/s
CB/T3325-1995
5.13.4 The stability of cabinets shall be tested in accordance with GB10357.4. 5.13.5 The strength and durability of cabinets shall be tested in accordance with GB10357.5. 5.13.6 The strength and durability of single-layer beds shall be tested in accordance with the provisions of GB10357.6. 5.14 Determination of peel strength
The peel strength of soft and hard covers shall be tested in accordance with the provisions of ZBY80002 and ZBY80003 respectively. 6 Marking, packaging, transportation, storage
6.1 Marking
The finished product shall be marked with the manufacturer's name (trademark), factory address and qualified mark when leaving the factory. 6.2 Packaging and transportation
The finished product shall be padded or packaged during transportation to prevent damage or rain. 6.3 Storage
The finished product shall be kept dry and ventilated during storage to prevent pollution and sunlight. Padding shall be added when stacking to prevent pressure damage. Additional remarks:
This standard is proposed by China Light Industry General Association.
This standard is under the jurisdiction of the National Furniture Standardization Center. This standard was jointly drafted by Shanghai Furniture Research Institute and Shanghai Furniture Company. The main drafters of this standard are Ding Zhaoxin and Mao Yongle.1mm position difference measuring instrument. When measuring, the largest distance between the two adjacent surfaces of the door and the frame (or the door and the door, the door and the drawer, the drawer and the frame, the drawer and the drawer crown) should be selected. One of the adjacent surfaces is selected as the measurement reference surface. The base surface of the instrument is placed on the measurement base surface. The measuring surface of the instrument is measured on the other adjacent surface (and one or more parts are measured along the adjacent surface). When the measured values are all positive (or negative), the maximum absolute value is the position difference measurement value; when the measured values are positive or negative, the sum of the maximum absolute values is the position difference measurement value, and the maximum measurement value is the position difference evaluation value. When the design requires a certain distance value between the two adjacent surfaces of the door (or drawer) and the frame, the distance value should be deducted from the measured value each time.
5.7 Split measurement
Use a plug gauge to measure the maximum gap on each side.
5.8 Determination of the stability of the foot landing
Place the test piece on a flat plate. Use a feeler gauge to measure the distance between a foot and the plate. 5.9 Determination of wood moisture content
Determine in accordance with Article 5.2 of GB/T3324.
5.10 Determination of wrinkles and ripples
Use a caliper or wire gauge with an error of no more than 0.05mm to measure the height difference of wrinkles and weld scar ripples at the bend. 5.11 Appearance inspection
It should be inspected by three persons under natural light or near natural light with an illumination of 300 to 6001x (e.g. 40W fluorescent lamp) at a viewing distance of 700 to 1000 mm. The same conclusion of more than two persons shall be regarded as the evaluation result. 5.12 Determination of physical and chemical properties
5.12.1 The physical and chemical properties of baking varnish (spraying) coatings shall be tested in accordance with the following provisions: Hardness shall be tested in accordance with GB1730;
b. Impact strength shall be tested in accordance with GB1732
Corrosion resistance shall be tested in accordance with the heated salt water resistance method in Article 3.2 of GB1763; c.
d. Adhesion shall be tested in accordance with GB1720;
e. Glossiness shall be tested in accordance with GB1743.
GB/T3325—1995
5.12.2 The physical and chemical properties of electroplating layers shall be tested in accordance with the following provisions: Adhesion strength shall be tested in accordance with Article 2.1 of GB5933; a.
b. The surface roughness is tested in accordance with Article 3.2 of GB5926; Salt spray test: After the surface of the test piece is degreased, it is hung in a salt spray box at an angle of 15°~30°, and 5% sodium chloride solution (prepared by dissolving chemically pure NaCI reagent in distilled water) is sprayed intermittently for 8 hours (spray for 15 minutes every hour, maintain the temperature at 35±2°C), and stored for 16 hours (natural cooling during storage), 24 hours as a cycle, the salt spray deposition rate is 1±0.5mL/h·80cm2, and the test piece is washed with clean water to remove the test solution, and the size and number of rust spots on the test piece are observed; d. The thickness of the chrome plating layer of metal parts should be determined by the timed drip method. After the surface of the test piece is degreased, the test piece, reagents and test equipment are stored at 20-25℃ for at least 3h. During the test, the test piece is placed flat, and a drop of hydrochloric acid (specific gravity 1.18) is dripped onto the surface of the chromium layer using a 0.5mm dropper; a stopwatch is used to time the reaction between the hydrochloric acid and the chromium layer until the local chromium layer is dissolved and the inner layer is exposed; according to the required time, refer to Table 4 and calculate according to the following formula:
where d is the thickness of the chromium layer - μm,
the time required to dissolve the chromium layer, s;
the thickness of the chromium layer dissolved per second, μm/s.
solution temperature, ℃
K, μm/s
the oxide film thickness is tested in accordance with Article 4.1 of GB5928. 5.12.3The physical and chemical properties of the paint film on the surface of wooden parts are tested in accordance with the provisions of GB4893. 5.13 Determination of mechanical properties
The strength and durability of tables shall be tested in accordance with GB10357.1. 5.13.1
The stability of chairs and stools shall be tested in accordance with GB10357.2. The strength and durability of chairs and stools shall be tested in accordance with GB10357.3. 5.13.3
Solution temperature, ℃
K, um/s
CB/T3325-1995
5.13.4 The stability of cabinets shall be tested in accordance with GB10357.4. 5.13.5 The strength and durability of cabinets shall be tested in accordance with GB10357.5. 5.13.6 The strength and durability of single-layer beds shall be tested in accordance with the provisions of GB10357.6. 5.14 Determination of peel strength
The peel strength of soft and hard covers shall be tested in accordance with the provisions of ZBY80002 and ZBY80003 respectively. 6 Marking, packaging, transportation, storage
6.1 Marking
The finished product shall be marked with the manufacturer's name (trademark), factory address and qualified mark when leaving the factory. 6.2 Packaging and transportation
The finished product shall be padded or packaged during transportation to prevent damage or rain. 6.3 Storage
The finished product shall be kept dry and ventilated during storage to prevent pollution and sunlight. Padding shall be added when stacking to prevent pressure damage. Additional remarks:
This standard is proposed by China Light Industry General Association.
This standard is under the jurisdiction of the National Furniture Standardization Center. This standard was jointly drafted by Shanghai Furniture Research Institute and Shanghai Furniture Company. The main drafters of this standard are Ding Zhaoxin and Mao Yongle.1mm position difference measuring instrument. When measuring, the largest distance between the two adjacent surfaces of the door and the frame (or the door and the door, the door and the drawer, the drawer and the frame, the drawer and the drawer crown) should be selected. One of the adjacent surfaces is selected as the measurement reference surface. The base surface of the instrument is placed on the measurement base surface. The measuring surface of the instrument is measured on the other adjacent surface (and one or more parts are measured along the adjacent surface). When the measured values are all positive (or negative), the maximum absolute value is the position difference measurement value; when the measured values are positive or negative, the sum of the maximum absolute values is the position difference measurement value, and the maximum measurement value is the position difference evaluation value. When the design requires a certain distance value between the two adjacent surfaces of the door (or drawer) and the frame, the distance value should be deducted from the measured value each time.
5.7 Split measurement
Use a plug gauge to measure the maximum gap on each side.
5.8 Determination of the stability of the foot landing
Place the test piece on a flat plate. Use a feeler gauge to measure the distance between a foot and the plate. 5.9 Determination of wood moisture content
Determine in accordance with Article 5.2 of GB/T3324.
5.10 Determination of wrinkles and ripples
Use a caliper or wire gauge with an error of no more than 0.05mm to measure the height difference of wrinkles and weld scar ripples at the bend. 5.11 Appearance inspection
It should be inspected by three persons under natural light or near natural light with an illumination of 300 to 6001x (e.g. 40W fluorescent lamp) at a viewing distance of 700 to 1000 mm. The same conclusion of more than two persons shall be regarded as the evaluation result. 5.12 Determination of physical and chemical properties
5.12.1 The physical and chemical properties of baking varnish (spraying) coatings shall be tested in accordance with the following provisions: Hardness shall be tested in accordance with GB1730;
b. Impact strength shall be tested in accordance with GB1732
Corrosion resistance shall be tested in accordance with the heated salt water resistance method in Article 3.2 of GB1763; c.
d. Adhesion shall be tested in accordance with GB1720;
e. Glossiness shall be tested in accordance with GB1743.
GB/T3325—1995
5.12.2 The physical and chemical properties of electroplating layers shall be tested in accordance with the following provisions: Adhesion strength shall be tested in accordance with Article 2.1 of GB5933; a.
b. The surface roughness is tested in accordance with Article 3.2 of GB5926; Salt spray test: After the surface of the test piece is degreased, it is hung in a salt spray box at an angle of 15°~30°, and 5% sodium chloride solution (prepared by dissolving chemically pure NaCI reagent in distilled water) is sprayed intermittently for 8 hours (spray for 15 minutes every hour, maintain the temperature at 35±2°C), and stored for 16 hours (natural cooling during storage), 24 hours as a cycle, the salt spray deposition rate is 1±0.5mL/h·80cm2, and the test piece is washed with clean water to remove the test solution, and the size and number of rust spots on the test piece are observed; d. The thickness of the chrome plating layer of metal parts should be determined by the timed drip method. After the surface of the test piece is degreased, the test piece, reagents and test equipment are stored at 20-25℃ for at least 3h. During the test, the test piece is placed flat, and a drop of hydrochloric acid (specific gravity 1.18) is dripped onto the surface of the chromium layer using a 0.5mm dropper; a stopwatch is used to time the reaction between the hydrochloric acid and the chromium layer until the local chromium layer is dissolved and the inner layer is exposed; according to the required time, refer to Table 4 and calculate according to the following formula:
where d is the thickness of the chromium layer - μm,
the time required to dissolve the chromium layer, s;
the thickness of the chromium layer dissolved per second, μm/s.
solution temperature, ℃
K, μm/s
the oxide film thickness is tested in accordance with Article 4.1 of GB5928. 5.12.3The physical and chemical properties of the paint film on the surface of wooden parts are tested in accordance with the provisions of GB4893. 5.13 Determination of mechanical properties
The strength and durability of tables shall be tested in accordance with GB10357.1. 5.13.1
The stability of chairs and stools shall be tested in accordance with GB10357.2. The strength and durability of chairs and stools shall be tested in accordance with GB10357.3. 5.13.3
Solution temperature, ℃
K, um/s
CB/T3325-1995
5.13.4 The stability of cabinets shall be tested in accordance with GB10357.4. 5.13.5 The strength and durability of cabinets shall be tested in accordance with GB10357.5. 5.13.6 The strength and durability of single-layer beds shall be tested in accordance with the provisions of GB10357.6. 5.14 Determination of peel strength
The peel strength of soft and hard covers shall be tested in accordance with the provisions of ZBY80002 and ZBY80003 respectively. 6 Marking, packaging, transportation, storage
6.1 Marking
The finished product shall be marked with the manufacturer's name (trademark), factory address and qualified mark when leaving the factory. 6.2 Packaging and transportation
The finished product shall be padded or packaged during transportation to prevent damage or rain. 6.3 Storage
The finished product shall be kept dry and ventilated during storage to prevent pollution and sunlight. Padding shall be added when stacking to prevent pressure damage. Additional remarks:
This standard is proposed by China Light Industry General Association.
This standard is under the jurisdiction of the National Furniture Standardization Center. This standard was jointly drafted by Shanghai Furniture Research Institute and Shanghai Furniture Company. The main drafters of this standard are Ding Zhaoxin and Mao Yongle.um/s
CB/T3325-1995
5.13.4 The stability of cabinets shall be tested in accordance with GB10357.4. 5.13.5 The strength and durability of cabinets shall be tested in accordance with GB10357.5. 5.13.6 The strength and durability of single-layer beds shall be tested in accordance with GB10357.65.14 Determination of peeling strength
The peeling strength of soft and hard coverings shall be tested in accordance with ZBY80002 and ZBY80003 respectively. 6 Marking, packaging, transportation, storage
6.1 Marking
The finished product shall be marked with the manufacturer's name (trademark), factory address and qualified mark when leaving the factory. 6.2 Packaging and transportation
The finished product shall be padded or packaged during transportation to prevent damage or rain. 6.3 Storage
During storage, finished products should be kept dry, ventilated, and protected from contamination and sunlight. Padding should be added when stacking to prevent damage. Additional remarks:
This standard was proposed by the China Light Industry General Association.
This standard is under the jurisdiction of the National Furniture Standardization Center. This standard was jointly drafted by the Shanghai Furniture Research Institute and Shanghai Furniture Company. The main drafters of this standard are Ding Zhaoxin and Mao Yongle. 15um/s
CB/T3325-1995
5.13.4 The stability of cabinets shall be tested in accordance with GB10357.4. 5.13.5 The strength and durability of cabinets shall be tested in accordance with GB10357.5. 5.13.6 The strength and durability of single-layer beds shall be tested in accordance with GB10357.65.14 Determination of peeling strength
The peeling strength of soft and hard coverings shall be tested in accordance with ZBY80002 and ZBY80003 respectively. 6 Marking, packaging, transportation, storage
6.1 Marking
The finished product shall be marked with the manufacturer's name (trademark), factory address and qualified mark when leaving the factory. 6.2 Packaging and transportation
The finished product shall be padded or packaged during transportation to prevent damage or rain. 6.3 Storage
During storage, finished products should be kept dry, ventilated, and protected from contamination and sunlight. Padding should be added when stacking to prevent damage. Additional remarks:
This standard was proposed by the China Light Industry General Association.
This standard is under the jurisdiction of the National Furniture Standardization Center. This standard was jointly drafted by the Shanghai Furniture Research Institute and Shanghai Furniture Company. The main drafters of this standard are Ding Zhaoxin and Mao Yongle. 15
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