GB/T 4897.1-2003 Particleboard Part 1: Common requirements for all board types
Some standard content:
ICS 79, 060. 20
National Standard of the People's Republic of China
GB/T 4897.1--2003
Partially replaces GB/T4897-1992
Particleboard--Part 1 : General requirements for all board
types2003-01-27 release
People's Republic of China
State Administration of Quality Supervision, Inspection and Quarantine
2003-05-01 implementation
GB/T4897.1—2003
GB/T4897 "Particleboard" is divided into seven parts: Preface
Part 1: Common requirements for all board types,--Part 2: Requirements for first-class boards used in dry state,--Part 3: Requirements for furniture and interior decoration boards used in dry state,--Part 4: Requirements for structural boards used in dry state,--Part 5: Requirements for structural boards used in wet state;--Part 6: Requirements for reinforced structural boards used in dry state;--Part 7: Requirements for reinforced structural boards used in wet state. This part is the first part of GB/T4897 "Particleboard". This part adopts the common requirements of all types of board, which is not equivalent to the embedded standard EN312-1.1997, Part 1 of the particleboard. The technical requirements (except for the formaldehyde emission limit index) and marking adopt EN312-1 and add the definition, classification, appearance quality, inspection rules and other items. This part replaces the corresponding part of GB/4897--1992 particleboard. Compared with the previous version of the standard (GB/T4897-1992), the important technical change of GB/T4897-2003 "Particleboard" is that the original standard is divided into seven parts, among which the requirements for structural boards used in moist state and the requirements for reinforced structural boards used in wet state are newly added contents. This part only specifies the common requirements of all types of particleboard. This part was proposed by the State Forestry Bureau.
This part is under the jurisdiction of the National Technical Committee for Standardization of Particleboards. The responsible drafting unit of this part is: the Institute of Basic Materials Industry of the Chinese Academy of Forestry. The participating drafting units of this part are: Beijing Timber Factory and Hebei Saibo Board Industry Group. The main drafters of this part are Chen Shiying, Long Ling, Zheng Fengshan and Zhang Zhanhao. This part was first issued in February 1985, revised for the first time in August 1992, and this is the second revision. This part is entrusted to the Technical Committee for Standardization of All Wood-Based Panels for interpretation. 1 Scope
GB/T 4897.1—2003
Particleboard Part 1: Common requirements for all board types This part of GB/T4897 specifies the definition, classification, statistical calculation and determination methods, measurement and test methods, inspection rules, marking, packaging, transportation and storage, and marking of particleboard. This part applies to particleboard defined in 3.1. This part does not apply to oriented strand board (OSB). 2 Normative references
The clauses in the following documents become the clauses of this part through reference in this part of GB/T4897. For dated references, all subsequent amendments (excluding errata) or revisions are not applicable to this part. However, parties to agreements based on this part are encouraged to study whether the latest versions of these documents can be used. For undated references, the latest versions apply to this part.
GB/T28281987 Sampling procedures and sampling tables for batch inspection (applicable to inspection of continuous batches) GB/T17657-1999 Test methods for physical and chemical properties of wood-based panels and veneered wood-based panels 3 Terms and definitions
The following terms and definitions apply to this part of GB/T4897. 3.1
Particleboard
A board made by hot pressing wood chips (wood chips, sawdust or similar materials) or non-wood plant chips (flax chips, bagasse, wheat straw, rice straw or similar materials) with adhesives. 3.2
Particleboard for general purpose boards for use in dry conditionsParticleboard for boards for interior fitments (including furniture) for use in dry conditionsParticleboard for general purpose boards for use in dry conditionsParticleboard for boards for use in dry conditionsParticleboard for load-bearing boards for use in dry conditionsParticleboard for boards for interior fitments (including furniture) for use in dry conditionsParticleboard for boards for load-bearing boards ...
Particleboard for load-bearing hoards for use in humid conditions Particleboard for load-bearing hoards for use in humid conditions Particleboard for load-bearing hoards for use in humid conditions Particleboard for load-bearing hoards for use in humid conditions Particleboard for load-bearing hoards for use in humid conditions Particleboard for load-bearing hoards for use in humid conditions Particleboard for load-bearing hoards for use in humid conditions Particleboard for heavy-duty load-bearing hoards for use in humid conditions Particleboard for heavy-duty load-bearing hoards for use in humid conditions Particleboard for load-bearing hoards for use in humid conditions Particleboard for heavy-duty load-bearing hoards for use in humid conditions Particleboard for load-bearing hoards for use in humid conditions Particleboard for heavy-duty load-bearing hoards for use in humid conditions Particleboard for load-bearing hoards for use in humid conditions Particleboard for heavy-duty load-bearing hoards for use in humid conditions Particleboard for load-bearing hoards for use in humid conditions Particleboard for heavy-duty load-bearing hoards for use in humid conditions Particleboard for load-bearing hoards for use in humid conditions 3.8
Dry conditions
The state when the air temperature is kept at 20℃ and the relative humidity (RH) is within 65% for three consecutive weeks in a year. 3.9
Humid conditions
The state when the air temperature is kept at 20℃ and the relative humidity (RH) is within 85% for three consecutive weeks in a year. 4 Classification
Particleboard is classified as follows.
4.1 According to the manufacturing method
-Flat-pressed particleboard;
Roller-pressed particleboard.
4.2 According to the surface state
Final sanded board;
... Sanded board
Coated board;
-Decorative material veneer (decorative materials such as decorative veneer, Hankui film paper, decorative pressed board, film, etc.). 4.3 According to the surface shape:
- Flat board;
Moulded board.
4.4 According to the size and shape of the particles:
Chipboard;
Oriented particle board.
4.5 According to the composition of the board:
Single-layer particleboard;
- Three-layer particleboard 1
Multi-layer particleboard;
- Gradient structure particleboard.
4.6 According to the raw materials used:
Wood particleboard,
Sugarcane chipboard;
--- Yama chipboard
~ Wheat straw chipboard
---- Bamboo chipboard;
- Others.
4.7 According to the purpose:
General purpose board used in dry state, - Furniture and interior decoration board used in dry state; - Structural board used in dry state! - Structural board that expands in moist state
Reinforced structural board used in dry state, - Reinforced structural board used in wet state. 5 Technical requirements
5.1 Thickness
The nominal thickness of particleboard is 4, 6, 8.10, 12, 14, 16, 19, 22, 25.30mm, etc. 5.2-sided
The size of particleboard is 1220mm×2440mm. Note: With the agreement between the supply and demand parties, particleboards with other sizes can be produced first. 5.3 The allowable value of the difference between the diagonals shall be in accordance with the provisions of Table 1. Table 1 Allowable value of the difference between the diagonals
Board length
>1 220--1 830
≥1. 830~2 440
>2 440
5.4 The appearance quality shall comply with the provisions of Table 2.
Table 2 Appearance quality
Defect name
Broken marks, penetration
Single area>40 mm glue spots, wax spots, oil spots and other stains
The common indicators of particleboard when leaving the factory shall comply with the provisions of Table 3. Allowable value
Not allowed
Not allowed
Not allowed within nominal size
Table 3 Index of particleboard at the time of leaving the factoryNo.
Deviation of nominal size
Deviation of straightness of board edge
Moisture content
Deviation of average density in board
Formaldehyde release plate (perforation value)\
Thickness in and between boards (sanded board)
Thickness in and between boards (unsanded board)
Length and width
1) The smaller deviation of thickness in and between boards (sanded board) shall be agreed upon by the supply and demand parties. 2) Particleboard with a thickness of 10 mm is not tested.
GB/T 4897, 1---2003
The unit is millimeter
m/100g
0.1,+1.9
0.4~0.9
3) Formaldehyde emission (perforation value) is the value measured when the moisture content of the sample is 6.5%. During the determination, if the moisture content (H) of the specimen is within the range of 3% ≤ H ≤ 10%, the coefficient F is used, F==0.133H+1.85; if the moisture content of the specimen is >10%, then multiply it by the coefficient F, F=-0.636+3,12e-,H) GB/T 4897. 1—2003
6 Statistical calculation and judgment method
6. 1 Statistical calculation
6.1.1 Mean
The mean value of a board is the arithmetic mean of the test values of a specimen in the board, calculated according to formula (1): X--X+ +.-.) =-12x.
(1)
6,1,2 Find the minimum value (static bending strength, internal bonding strength, surface bonding strength, 2 h after boiling in water, internal bonding strength, screw holding force) or maximum value (water absorption thickness expansion rate). 6.2 Judgment method
6.2.1 The static bending strength, internal bonding strength, surface bonding strength of a board, the arithmetic mean value X of the internal bonding strength and screw holding force after boiling in water for 2 h and the minimum value Xu of any specimen shall meet the requirements of formula (2) and formula (3): XS.
Xnin 2 0. 8 S.
Where:
-standard specified value.
（2）
6. 2. 2~~The arithmetic mean value of the water absorption thickness expansion rate of a board and the maximum value X of any specimen shall meet the requirements of formula (4) and formula (5): xssu
Xur ≤ 1.2S.
Where:
S.—standard specified value.
（5）
6.2.3 When inspecting multiple boards, each board shall comply with the provisions of 6.2.1 and 6.2.2. If not, re-inspect and judge according to 8.4. 6.2.4 For other performance indicators not specified, only the arithmetic mean value shall be used for judgment. 7 Measurement and test methods
The following are general measurement and test methods for particleboard. 7. Specification and dimension measurement
7.1.1 Measuring tools
7.1.1.1 Micrometer, accuracy 0.01 mm. 7.1.2 Steel ruler, accuracy 0.5 mm. 7.1.1.3 Tape measure, accuracy 1 mm.
7. Hand.1.4 Fine steel wire.
7.1.2 Thickness measurement
Measure 8 points at the middle and four corners of the four sides of the board, 25 mm away from the edge of the board, and calculate the arithmetic mean, accurate to 0.01 mm.
7.1.3 Length and width measurement
Measure the length and width at any position in the width and length direction of the board with a steel ruler, accurate to 1 mm. 7.1.4 Diagonal difference measurement
Measure the diagonal length of the board with a steel tape measure, and calculate the difference between the two diagonals, accurate to 1 mm. 7.1.5 Curvature measurement
Place the particleboard with the concave surface facing up on a horizontal surface, connect the two diagonals of the board with a thin steel wire, and measure the maximum chord height with a steel ruler, accurate to 0.5 mm. The ratio of the maximum chord height to the diagonal length is the curvature, expressed as a percentage, accurate to 0.1%. 7.1.6 Measurement of edge irregularity
GB/T 4897.1—2003
Edge irregularity Use a thin steel wire to align the two corners of the board (see Figure 1), and use a steel ruler to measure the maximum deviation between the board edge and the thin steel wire, accurate to 0.5m1. The ratio of the maximum deviation to the edge length is the edge irregularity, expressed in millimeters per meter (mm/m). All four edges of the board should be measured. -4 Deviation
Fine smooth wire
Sensitive flower board
Figure 1 Measurement of edge straightness
7.2 Sampling and test piece size regulations for physical and chemical performance inspection7.2.1 Instruments and pans
7.2.1.1 Micrometer, accuracy 0.01mm,
7.2.1.2 Vernier caliper. Accuracy 0.1 mm17.2.1.3 Steel tape measure, accuracy 1mm.
7.2.1.4 Balance, maximum sensitivity 0.01g.
7.2.2 Method
7.2.2.1 Preparation of test pieces
Samples shall be drawn according to the provisions of 8.4.
According to the laying direction of the particleboard, cut three specimens according to the samples a) and b) in Figure 2, and indicate the specimen number, upper and lower surfaces and board edge positions.
The unit is meter
Sample 1
Board storage direction
Sample length
Sample 2
Sample 3
) When the board laying direction is parallel to the sample length direction, the sample is sawed. Schematic diagram of particleboard sample preparation diagram
GB/T 4897.1—2003
Sample 1
7.2.2.2 Specimen sawing
Sample 2
Sample length
17 m Sample length
Sample 3
bh) When the board loading direction is perpendicular to the sample length direction, the sample is sawed. Schematic diagram of sample cutting Figure 2 (continued)
The unit is meter
Grass★Forest
Each sample shall be sawn according to the provisions of Figure 3 and Table 4. At least one of the static bending strength, elastic modulus, internal bonding strength and surface bonding strength specimens is cut from the edge of the sample in the paving direction. The minimum distance between two specimens of the same test item is 100mm. When sawing the specimens, the edges of the specimens should be flat and the adjacent sides should be perpendicular to each other. For particleboard with a thickness greater than 25mm, samples and specimens should be made at appropriate positions according to the above-mentioned specimen and specimen sawing principles. Table 4 Dimensions, quantity and number of specimens
Test items
Density, moisture content
Static bending strength, elastic modulus
Internal bonding strength
Surface bonding strength
Water absorption thickness expansion rate
2 h Internal bonding strength after water point
Screw forcewwW.bzxz.Net
Formaldehyde release distance
Bin size/
10x100
Length 20+50, but not less than
200, width 50
50×50
50×50
150×50
20×20
Number of specimens/
Plate surface 3
Plate edge 6
Density and moisture content are measured simultaneously on one specimen. Nominal thickness of the board.
No test is performed when the board thickness is less than 18 mm. When the thickness is ≥16 mm and s≤25 mm, three test pieces are glued into one test piece (the two test pieces can be cut at any position in the test piece)
Sawed at any position. The total mass is about 330 g. Test piece 092
7.2.2.3 Test piece measurement
20±+50
20h+50
Figure 3 Preparation of particleboard test piece
Perform the test according to 4.1 of GB/T17657:1999 7.3 Density determination
Perform according to the provisions of 4.2 of GB/T 17657-1999. 7. 4 Average density deviation within the board
7.4. Determine the density according to the provisions of 4.2 of GB/T 17657-1999. 100
7.4.2 Average density deviation in the board △ in %) is calculated according to formula (6), accurate to 0.1%4p-~m (or P-×100-
wherein:
Maximum density, unit is gram per cubic centimeter (g/cm); Minimum density, unit is gram per cubic centimeter (g/cm); Average density, unit is gram per cubic centimeter (g/cm). 7.5 Determination of moisture content
According to 4.3 of GB/T 17657-1999. 7.6 Determination of formaldehyde emission
According to 4.11 of CB/T 17657-1999. 8 Inspection regulations
8.1 Inspection classification
09+408
B/T4897.12003
Unit is meter
GB/T 4897. 1—2003
Product inspection is divided into factory inspection, delivery inspection and type inspection. 8.1.1 Factory inspection and delivery inspection include the following items: a) Appearance quality;
b) Specifications and dimensions;
c) Physical and chemical properties: density, moisture content, water absorption thickness expansion rate, internal strength, static bending strength, internal strength after 2h boiling water, free formaldehyde release.
8.1.2 Type inspection includes all items of factory inspection and adds the following items: bending elasticity mold, surface bonding strength, prying force. 8. 1,3 Type inspection should be carried out in any of the following situations: a) When there are major changes in raw materials and production processes; b) When resuming production after a long period of suspension; c) During normal production, type inspection shall be carried out no less than four times a year; 4) When the quality supervision agency makes a type inspection request. 8.2 Appearance quality inspection
Appearance quality inspection adopts the secondary normal inspection sampling plan in GB/T2828--1987, with an inspection level of 1 and a qualified quality level of AQI, = 4.0, see Table 5. Inspect sample n1 according to 5.4. Accept when the number of unqualified products ds ≤ 4, and reject when d1 ≥ R1. If A,
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