This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of polystyrene foam plastic packaging materials. This standard applies to polystyrene foam plastic packaging materials with a closed-cell structure obtained by heating and pre-foaming expandable polystyrene beads and then heating and molding them in a mold. QB/T 1649-1992 Polystyrene Foam Plastic Packaging Materials QB/T1649-1992 Standard download decompression password: www.bzxz.net
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of polystyrene foam plastic packaging materials. This standard applies to polystyrene foam plastic packaging materials with a closed-cell structure obtained by heating and pre-foaming expandable polystyrene beads and then heating and molding them in a mold.

Light Industry Industry Standard of the People's Republic of China
Polystyrene Foam Plastic Packaging Materials
Subject Content and Scope of Application
QB/T1649--92
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of polystyrene foam plastic packaging materials.
This standard applies to polystyrene foam plastic packaging materials with a closed-cell structure that are made by pre-foaming expandable polystyrene beads by heating and then heating and molding them in a mold. 2
Cited standards
GB 2828
GB 2918
GB6343
GB 8811
GB 8812
GB 8813
Product classification
Batch inspection Count sampling procedure and sampling table (applicable to inspection of continuous batches) Standard environment for conditioning and testing of plastic specimens Determination of apparent density of foam plastics and rubber Test method for dimensional stability of rigid foam plastics Bend test method for rigid foam plastics
Compression test method for rigid foam plastics
Polystyrene foam plastic packaging materials are divided into four categories according to density: I, I, sub-, and N, see Table 1. Table 1
Technical requirements
4.1 The deviations of length, width, and height shall comply with the requirements of Table 2. Table 2
Basic dimensions
400~600
601~~800
801~~1 000
Approved by the Ministry of Light Industry of the People's Republic of China on January 15, 1993
15.0~19. 9
20.0~24.9
25.0~29.9
30.0~34.9
Implemented on September 1, 1993
The deviation of wall thickness shall comply with the requirements of Table 3.
Basic dimensions
4.3 The appearance shall comply with the requirements of Table 4.
QB/T1649—92
Surface is flat, without obvious bulging, shrinkage and deformation. Good sintering, without obvious grain loss
No obvious stains and impurities
Physical and mechanical properties shall meet the requirements of Table 5.
Apparent density deviation, kg/m2
Compressive strength, kPa
(Compressive stress at 10% relative deformation)
Bending load at break, N
Dimensional stability, %
Water content, %
5Test method
Limit deviation
≥100
≥130
5.1 Length, width and height are measured with a measuring tool with an accuracy of 1mm, and wall thickness is measured with a measuring tool with an accuracy of 0.5mm. 5.2 Appearance is visually inspected under normal light.
5.3 Physical and mechanical propertieswww.bzxz.net
5.3.1 Sampling
≥180
5.3.1.1 Sampling is carried out 24 hours after the product is produced.
5.3.1.2 Cut the sample from the thicker part of the product wall. If it is not possible to cut the sample from the product, a larger sample can be made with the same formula and the same process conditions, and then the sample can be cut.
5.3.2 The standard environment for sample state adjustment and testing is carried out in accordance with GB2918 at a temperature of (23 ± 2) °C and a relative humidity of 45% to 75% for 16 hours, and the test is carried out in this environment.
5.3.3 Apparent density deviation
Apparent density is carried out in accordance with GB6343. Sample size: length (50 ± 0.5) mm, width (50 ± 0.5) mm, thickness (25 ± 0.5) mm, and the number of samples is 3. The apparent density deviation value is obtained by subtracting the nominal value from the apparent density measured value. 5.3.4 Compression strength
Perform according to GB8813. Sample size: length (50±0.5) mm, width (50±0.5) mm, thickness (25±0.5) mm, sample 216
Number of 5. Test speed 10mm/min.
5.3.5 Determination of fracture bending load
Perform according to GB8812.
5.3.6 Determination of dimensional stability
QB/T 1649--92
Perform according to GB8811. Temperature (70 ± 2) °C, time 48h, sample size length (80 ± 1) mm, width (80 ± 1) mm, thickness (20 ± 1) mm, measure the length (L, L2, L:), width (W1, W2, W:) at three different positions of each sample and the thickness (T, T, T, T4, T,) at five different points of each sample. As shown in Figure 1.
5.3.7 Determination of moisture content
5.3.7.1 Sample
a. Shape and specifications
Thickness less than 25 mm, weight between 5 and 10 g; b. 3 samples.
5.3.7.2 Test steps
Weigh the original weight of the sample accurately and record it, then dry the sample in a constant temperature drying oven at (70±2)℃ until the weight of the sample is constant at a fixed value (i.e. the difference between two values ​​measured at least 1h apart is less than 0.2%), then record the weight after drying. 5.3.7.3 The result is calculated according to formula (1).
Where: X-
water content, %;
-weight before drying, nominal;
Wa-weight after drying, g.
Take the arithmetic mean of the three samples.
6 Inspection rules
6.1 Factory inspection
6.1.1 Inspection items
Dimensions, appearance.
W. - Wa
d×100
6.1.2 The number of products of the same specification in a batch shall not exceed 5,000 pieces as a batch. 6.1.3 Sampling shall be carried out in accordance with the provisions of GB2828, with AQL of 4.0, general inspection level 1, and a normal inspection sampling plan. 6.2 Type inspection
QB/T1649—-92
6.2.1 All items specified in the technical requirements for inspection items. 6.2.2 Type inspection shall be carried out in any of the following circumstances: a.
After formal production, if there are major changes in the process or raw materials, which may affect the product performance; in normal production, once every six months; when the product is stopped for more than three months and then resumed; when the national quality supervision agency proposes a type inspection requirement. 6.2.3 Sampling and judgment rules
6.2.3.1 Dimensions and appearance
Randomly select 20 samples from the qualified products of the factory inspection. If 3 or more samples are unqualified, the batch is unqualified. 6.2.3.2 Physical and mechanical properties
Randomly select a group of samples from the 20 samples. If all samples are qualified, the batch is qualified. If there are unqualified items, double samples should be taken from the original batch for retesting. If there are still unqualified items, the batch is unqualified. 7 Marking, packaging, transportation, storage
7.1 Marking
Each package (box, bundle) of products should have a qualified stamp, and each batch of products should be marked with the manufacturer's name, product name, trademark, product specification or model, production date or production batch number, and inspector's stamp.
7.2 Packaging
Products can be packaged in cartons or plastic bags, or packaged according to user requirements. 7.3 Transportation and storage
During transportation and storage, fireworks are strictly prohibited. Do not place heavy objects, drop objects, or collide with sharp objects. Prevent rain, snow, and water. Store in a dry and ventilated place. Do not expose the objects to the sun for a long time. Keep away from heat sources and avoid contact with chemicals. Additional remarks:
This standard was proposed by the Quality Standards Department of the Ministry of Light Industry. This standard is under the jurisdiction of the National Plastic Products Standardization Center. This standard was drafted by the Beijing Foam Plastic Factory. The main drafters of this standard are Wu Licheng, Liu Jingmin, Ren Juzhen, and Liang Xiaoping. This standard adopts the Japanese Industrial Standard JIS Z1536-75 (89) "Polystyrene Foam Plastics for Packaging Cushioning" and the West German Standard DIN55471-1983 "Performance Test of Polystyrene Foam Plastics for Packaging". 218
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