JB/T 6527-1992 Technical specifications for thermal insulation sandwich panels for combined cold storage
Some standard content:
Machinery Industry Standard of the People's Republic of China
Technical Conditions for Insulated Sandwich Panels for Combined Cold Storage 1 Subject Content and Scope of Application
JB/T 6527—92
This standard specifies the specifications for use in combined cold storage Technical requirements, test methods, inspection rules and markings, packaging, transportation and storage of thermal insulation sandwich panels. This standard applies to insulated sandwich panels for combined cold storage (hereinafter referred to as "sandwich panels") with rigid polyurethane foam or polystyrene foam as the core layer and metal materials or other materials as the panels. 2 Reference standards
GBn168 Non-heat-treatable reinforced aluminum and aluminum alloy plates GB2406 Plastic combustion performance test method Oxygen index method GB2518 Continuous hot-dip galvanized steel sheet and steel strip plastic thermal conductivity test method GB 3399|| tt||GB6343
GB 8810
GB 8812
GB 8813
SG232
3 Technical requirements
Appearance of foam plastics and rubber Determination of density Determination of water absorption of rigid foam plastics
Bending test method for rigid foam plastics
Compression test method for rigid foam plastics
Polystyrene foam sheet||tt| |3.1 Sandwich panels shall be manufactured in accordance with the provisions of this standard and in accordance with the drawings and technical documents approved by the prescribed procedures. Special requirements shall be in accordance with the requirements of the agreement, and supplementary provisions shall be made in the corresponding technical documents. 3.2 The panel material can be polyester-coated colored steel plate, aluminum alloy plate or galvanized steel plate. The thickness of the base material should not be less than 0.5mm and should meet the following requirements:
Polyester-coated colored steel plate: base material It is BzF, the total dry film thickness of the coating is 25μm, the polyester coating is 20μm, and the primer is 5μm; a.
b. Aluminum alloy plate: brand name is LF, LFz1, supply status is M, chemical composition and other indicators should comply with the provisions of GBn168; galvanized steel plate: steel strip 275-SC-XL-GB2518. C
3.3 The exposed surface coating of the sandwich panel panel should be non-toxic, odorless and non-contaminating to food. 3.4 The physical and mechanical properties of the foam plastic in the core layer of the sandwich panel should comply with the requirements in Table 1. Table 1
item
item
density, kg/m2
compressive strength\)
flexural strength
kPa||tt| |Rigid polyurethane
32~~50
≥160
≥245
The Ministry of Mechanical and Electronics Industry of the People's Republic of China approved 1224 on December 25, 1992||tt| |Foam plastic
Polystyrene
20
≥65
≥170
1993-07-01 Implementation
item|| tt||mesh
Thermal conductivity\,W/(m2.K)
Water absorption,%(V/V)
Dimensional stability
+70~ —40℃
Oxygen index
%
JB/T 6527 -- 92
Continued Table 1
Rigid polyurethane
0.024
Note: 1) Compressive strength: refers to the compressive stress under 10% deformation. 2) The thermal conductivity measurement sample block shall be placed for no less than 28 days from the date of foaming. 3.5 The size and shape tolerances of the sandwich panel should comply with the requirements in Table 2. Table 2
item
item
length
widthbzxz.net
thickness
diagonal
straightness|| tt||Foam plastic
4
±0.5
≥30
Polyethylene
0.041
Tolerance level IT||tt ||13
15
14
≤2/1000
3.6 The tensile strength of the core foam plastic of the sandwich panel perpendicular to the board surface should comply with Table 3 Regulation. Table 3
item
item
tensile strength
rigid polyurethane
147
foam plastic
polystyrene Ethylene | | tt | | 110 | | tt | | kPa | . 3.8 The relative deflection of the sandwich panel should not exceed 1/250 under a uniform load of 500N/m2. 3.9 The sandwich panel should not have scratches, bumps and other defects. The surrounding surface of the rigid polyurethane foam sandwich panel and the polyurethane foam sandwich panel There should be no convex and concave defects with a depth or height of 2 mm and an area greater than 1 cm2 on both sides of the width of the styrene foam sandwich panel. 4 Test methods
4.1 The density, flexural strength, compressive strength, thermal conductivity, water absorption, and oxygen index of the core material of the sandwich panel are measured according to the regulations of GB6343.GB8812, GB8813.GB3399, and GB8810.GB2406 respectively. . 4.2 The dimensional stability verification method of the core layer material of the sandwich panel shall be carried out in accordance with the provisions of SG232. 4.3 Method for measuring tensile strength perpendicular to the board surface 4.3.1 Determine the
to determine the tensile strength of the core foam plastic, and test the bonding performance between the panel and the core foam plastic. 4.3.2 Sample size
Each group of 3 samples, the size is 50 (±1) mm × 50 (±1) mm × H (H is the thickness of the sandwich panel in mm). The sample is composed of a sandwich core Cut from the board, the cross-section should be perpendicular to the board surface, and the parallelism error of the board surface should be less than 0.01H. 4.3.3 Testing equipment
The range of the tensile testing machine should be selected so that the actual measured value is between 10% and 90% of the full scale. The tensile testing machine should be configured as shown in Figure 11225||tt ||JB/T6527
92
clamp. The specimen and the metal block of the fixture are firmly bonded with adhesive, and at the same time, the axes of the specimen, fixture, and tensile machine are aligned. Bonding surface
1
Mid
Mid
Figure 1
Clamp body: 2 cross pins: 3 specimen; 4 connecting block 4.3.4 Test steps
Measure 3 points along the length and width of the sample, take the arithmetic mean, and round to a multiple of 0.05mm; a.
Place the test piece that has been bonded to the clamp connection block Install the sample and fixture on the testing machine; b.
Start the testing machine and pull it at a speed of 0.5~1.5mm/min. Record the maximum load when the insulation sandwich panel sample breaks. .
Test 3 samples in sequence and take the arithmetic mean value. 4.3.5 Calculation method
Tensile strength is calculated according to the following formula:
×10
P
where:, tensile strength kPa,
P - Maximum load during specimen testing, N
L - Initial length of specimen, cm;
B
Initial length of specimen, cm.
4.4 Determination method of relative deflection
4.4.1 Sample size
......(1)
3 pieces per group, size is 24H (±1)×2.5·H±1)×H or prototype sandwich panel (H is the thickness of the sandwich panel, mm). 4.4.2 Testing equipment
4.4.2.1 The testing machine (device) with uniformly distributed test load should ensure that the load is uniform during the deformation of the sample and that the support does not shift after loading.
4.4.2.2 Dial indicator accuracy is 0.02mm. 4.4.3 Test steps (Figure 2)
Check the length of the sample according to the thickness of the sample, determine the support distance, place the sample on the support, and measure the initial position (from the reference plane to the lowest point of the sample position distance), add a uniformly distributed test load within 3 minutes, leave it for 20 minutes, measure the position after loading, and make a record. Measure three samples in sequence, take their arithmetic mean, and round the measured values ??to multiples of 0.05mm. 1226
4.4.4 Calculation method
The relative deflection is calculated according to the formula:
where: S-relative deflection;
JB/T6527 ---92|| tt||L=24H
FA -
2
20H
Figure 2
1--Sample; 2—Support; 3— Dial indicator
-f
s
L
f. Sample position under test load, mm; f, Sample initial position, mm;
L sample length, mm.
4.5 Inspection method of the overall dimensions of the sandwich panel (Figure 3) 2
H
100
12
Diagonal length
Figure 3|| tt||Basic vertebra surface
(2)
4.5.1 Distribute 4 to 6 measuring points evenly along the length L direction of the sandwich panel. Check the width B of both sides of the board. Distribute 3 measuring points, check the length L on both sides of the board, and measure the diagonal lengths on both sides at the same time. The dimensional deviation complies with the provisions of Article 3.5. 4.5.2 Distribute 4 to 6 measuring points on the plane of the sandwich panel. The edge measuring points should be distributed at least 100mm away from the end and side of the panel. Measuring the thickness of the panel should comply with the provisions of Article 3.5.
4.5.3 To measure the flatness of the sandwich panel, place the side of the 1m-long steel ruler close to the plane of the sandwich panel, and use a feeler gauge to measure the gap at the light-transmitting area. When measuring, the steel ruler should be along the edge of the sandwich panel. For multi-directional displacement of the core board surface, the inspection results shall comply with the provisions of Article 3.5. 4.6 The appearance quality of sandwich panels shall be judged by naked eye observation in accordance with the requirements of 3.9. 5 Inspection Rules
5.1 Sandwich panels shall be inspected by the quality inspection department of the manufacturer or the national quality supervision agency in accordance with this standard and relevant technical documents. 5.2 Type inspection and factory inspection
5.2.1 Type inspection shall be carried out when one of the following situations occurs: new product identification;
a.
When there are major changes in materials and processes ;
b.
1227
c. When a product is out of production for a long time and resumes production. 5.2.2 The content of type inspection is stipulated as follows: inspection of sandwich panel panel materials;
a.
JB/T 6527—92
b. Inspection of the physical and mechanical properties of the foam plastics in the core layer of the sandwich panel; Inspection of the geometric dimensions of the finished product of the sandwich panel,
c.
Performance inspection of the finished product of the sandwich panel (tensile strength perpendicular to the board surface, bonding strength , relative deflection); d.
e.
Overall macro inspection of the finished sandwich panel.
5.2.3 The contents of factory inspection shall be inspected according to items c and e in 5.2.2. 5.3 Sampling inspection
5.3.1 For mass-produced sandwich panels, 3 pieces shall be sampled for every 500 pieces or less, and the sampling inspection shall be no less than 2 times per year. 5.3.2 The content of sampling inspection shall be in accordance with the provisions of 5.2.2b.c and e. Article b may use molds to prepare samples for inspection in the same batch and under the same conditions.
5.3.3 If any item is unqualified during the sampling inspection, the sampling inspection should be doubled again. If it is still unqualified, the batch of products will be judged to be unqualified. 6 Marking, packaging, transportation, storage
6.1 Each package is accompanied by a product logo, product certificate, and packing list, which include trademark, product name, specifications, model, batch number, production date, and manufacturer name. , inspector's seal and standard number. 6.2 The packaging box shall be made in accordance with relevant standards and drawings, and protective measures shall be taken during packaging to prevent moisture, mechanical damage and rust. 6.3 Products should be packaged and shipped independently and should not be mixed with other items. They should be placed stably during transportation to prevent impact and heavy pressure to ensure that the products are not damaged.
6.4 Products should be stored in warehouses with ventilation, moisture-proof and other facilities. 6.5 During transportation and storage, it is strictly forbidden to be close to fireworks, avoid being exposed to heat, and should not be exposed to chemicals that can dissolve or destroy them. Additional notes:
This standard is proposed and administered by the Hefei General Machinery Research Institute of the Ministry of Mechanical and Electronics Industry. This standard is drafted by Dalian No. 1 Refrigeration Equipment Factory, China General Mechanical Engineering Company, and Dalian Refrigerator Factory. The main drafters of this standard: Ma Yulun, Tan Degang, Wang Jiaxiang, Song Jiajing, Cui Yufeng. 1228
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