Some standard content:
National Standard of the People's Republic of China
Lining turnover box
Plastic container for food
1 Subject content and scope of application
GB/T5737.-1995
Replaces GB573785
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of plastic turnover boxes for food (referred to as food boxes).
This standard applies to food boxes without inner compartments produced by injection molding using polyolefin plastics as raw materials. Reference standards
GB2828 Batch inspection counting sampling procedures and sampling tables (applicable to continuous batch inspection)GB/T4857.3 Basic test for packaging and transport packages Static load stacking test methodGB/T4857.5 Basic test for packaging and transport packages Drop test methodGB5009.60 Analysis method for hygienic standards of polyethylene, polystyrene and polyrene molded products for food packagingGB9687 Hygienic standards for polyethylene molded products for food packagingProduct classification
Food boxes are classified according to their external dimensions. The recommended dimensions of the food box are shown in Table 1. Table 1
Technical requirements
4.1 Dimensional deviation
See Table 2.
Approved by the State Administration of Technical Supervision on December 8, 1995 10
Select any of the following values
Implemented on August 1, 1996
Maximum upper deviation
Maximum lower deviation
4.2 Quality deviation
GB/T 5737—1995
Technical requirements
0.5% of the product's approved size
According to the product's approved size, the corresponding deviation rate is taken in sections, and the deviation is calculated by the progressive method. The sum of the deviations below 200mm
does not exceed +3.0% to -3.0% of the approved quality. 4.3 Appearance
See Table 3.
Black spots, impurities
4.4 Side wall deformation rate
200 to 400mm part
—1. 25%
Technical requirements
Complete without cracks, smooth and flat, no obvious white marks allowed, no burrs on the edges and ends. Part above 400mm
In every 500cm2 area on each side of the box, there are no more than 5 black spots with a length of 0.5 to 2.0mm, and they are scattered. There is no black spot impurity with a length of more than 2.0mm
No obvious color difference, the color of the same batch of products is basically the same and does not affect the flatness of the box
No more than 1.0% on each side.
4.5 Matching
4.5.1 Stacking matching
Food boxes of different specifications should be stacked and matched appropriately. 4.5.2 Anti-slip stacking
Food boxes of the same specifications are not allowed to slide when stacking. 4.6 Physical properties
See Table 4.
Box bottom load bearing
Shrinkage deformation
Drop performance
Maintenance
Suspension performance
Hygiene performance
Box bottom plane deformation is not more than 10mm
The diagonal change rate in the box is not more than 1.0%Cracks are not allowed
The height change rate of the box is not more than 2.0%
Cracks are not allowed
Boxes that directly contact food should comply with the provisions of GB9687. Technical requirements
4.8 Printing
GB/T5737—1995
The printed words and patterns are clear and complete. Ink shedding is not allowed. 5 Test method
5.1 Samplewww.bzxz.net
The product can be taken as a sample only after 24 hours of demoulding. 5.2 Dimension deviation
Specification dimension inspection is measured by a general measuring tool with an accuracy of 1mm. The length and width are measured at the top of the box body. The length and width of the sample are the maximum lengths of the two connecting lines of the arcs at the four corners of its shape and the straight edge (see Figure 1). When calculating the sample length of the end protrusion, the values of the two end protrusions should be added. The height measurement position should be at the four corners, and the result is the maximum value of the four values. Accurate to 1mm. Figure 1 Schematic diagram of food box specification measurement
5.3 Mass deviation
Use a general scale with a sensitivity of 5 to weigh and calculate the percentage value with the approved mass. 5.4 Appearance
Measure under natural light conditions and use corresponding measuring tools. 5.5 Fit
5.5.1 Stacking fit
Put a box on the flat ground and put another box on it. After the matching parts are aligned, the two boxes can be stacked normally and qualified. Take 3 samples, which can be interchanged.
5.5.2 Anti-slip stacking
Stack the empty boxes on the flat ground, the stack height is not less than 2m, so that one side (short side) of the box bottom is raised, and the bottom surface of the box is at an angle of 5° with the ground plane. Slipping is not allowed. 5.6 Deformation
Use a general measuring tool with an accuracy of 0.05mm to measure. 5.6.1 Side wall deformation rate
The measurement method is shown in Figure 2. After finding the maximum deformation point on the measured surface of the sample, make the direction of the ruler parallel to the plane of the box mouth, and the ruler plane is perpendicular to the measured surface. The distance from the lower end of the ruler to this point is the side wall deformation △L of the measured surface. The length of the ruler should be consistent with the length of the II line of the measured surface. The side wall deformation rate A (%) of the test surface of the sample is calculated according to formula (1). A=
Wherein: A side wall deformation rate of the test surface of the sample, %; 1,--the length of the box side where the test surface is located, mm; Al,--the side wall deformation of the test surface, mm. 12
(1)
5.6.2 Load-bearing deformation of the bottom of the box
5.6.2.1 Test equipment
Western deformation
GB/T 5737---1995
Convex deformation
Figure 2 Schematic diagram of the measurement of the side wall deformation of the box
1 Sample; 2 Ruler; 3-Measuring tool
Flat plate, bracket and shelf (see Figure 3);
Digital indicator;
15 sand bags with a mass of 1kg.
Figure 3 Bracket and shelf
Note: The right bracket is symmetrical to the left bracket.
5.6.2.2 Test steps
5.6.2.2.1 Under normal temperature conditions, place a sample on the frame composed of brackets and shelf bars according to the actual stacking method, see Figure 4. The length of the shelf bar is selected according to the length and width of the sample.
5.6.2.2.2 Place the dial indicator on the flat plate and calibrate the zero position, that is, the reading when the height of the striker of the indicator is equal to the height of the frame is zero. Align the striker with the center of the bottom of the sample.
5.6.2.2.3 Put 15 sand bags into the sample box, make the bottom of the box evenly loaded, and start timing. When 15 minutes have passed, the reading of the dial indicator is the bearing deformation of the bottom of the sample.
5.6.2.3 Result expression
Take the maximum value of the bearing deformation of the bottom of the three samples. 13
5.6.3 Shrinkage deformation rate
5.6.3.1 Test equipment
GB/T5737--1995
Figure 4 Schematic diagram of bracket and shelf combination
1 Shelf; 2-right bracket; 3 Left bracket; 4 Steel plate insulation water tank, universal measuring tool with an accuracy of 1mm. 5.6.3.2 Test steps
After measuring the length of the two inner diagonals of the upper mouth of the sample, immerse it completely in water at 65±5℃ and start timing. After 10 minutes, take out the sample and place it at room temperature for 30 minutes. Then measure the length of the inner diagonals of the sample and calculate the change of each diagonal. The larger value is the shrinkage deformation of the sample. The shrinkage deformation rate B (%) of the sample is calculated according to formula (2). B
Where: 1--shrinkage deformation rate, %;
L. - the length of the inner diagonal before the test, mm; L, - the length of the inner diagonal after the test, mm. 5.6.3.3 Result expression
Take the maximum value of the shrinkage deformation rate of the three specimens. 5.7 Drop
ILo L,l
Perform according to G13/T4857.5. Three specimens for each. X 100
5.7.1 Drop in a box at room temperature
Under room temperature conditions, lift the specimen with a uniform load of 20kg to a height of 1.2m, keep the bottom surface of the specimen parallel to the impact surface, and then drop it from this height for three consecutive drops.
5.7.2 Drop in an empty box at low temperature
The specimen is placed in a 10±2°C environment for 4h, then lifted to a height of 2m, dropped from this height, and the long side, short side and their angles of the bottom surface of the specimen are placed on the ground in turn, and each drop is made once. The drop should be completed within 10 minutes. 5.8 Stacking
Take 3 samples and follow GB3/T4857.3. Place an empty box with the mouth facing upwards, and the total amount of the loading plate and the weight is 2500N. The load duration is 72h. Measure the height change of the loading plate at the midpoint of the two long sides of the mouth of the sample box body, △h, accurate to 0.01mm. The box height change rate C (%) is calculated according to formula (3). 14
Formula 4: C-
-sample height change rate, %;
H-sample height, mm;
GB/T 5737-1995
△h-average change in sample height after loading, mm. 5.9 Hanging
5.9.1 Test equipment
Lifting equipment:
Hook, made of 70mm wide steel plate, with sufficient strength (see Figure 5); rope, rope with low elongation (such as 8mm diameter multi-strand polypropylene rope); weight, weighing 60kg.
5.9.2 Test steps
(3)
Take 3 samples. At room temperature, hook the end of the sample with a hook so that the angle of the rope is 60°±3°, and the sample is weighed 60kg (see Figure 6). Then lift it off the ground in a balanced manner and start timing. When 10 minutes have passed, lower the sample, remove the hook, and inspect it. R13
5.10 Hygienic performance
Figure 5 Schematic diagram of the hook
60 ± 3
Figure 6 Schematic diagram of suspension
1-sample; 2-hook; 3 rope
Perform in accordance with GB5009.60. There are 10 samples. 5.11 Printing
5.11.1 Test equipment
Medical adhesive tape, 25mm wide and with an adhesive force of 200±20N. 15
GB/T 5737--1995
Roller, weight 850g (excluding the handle), rubber-wrapped roller (roller width 60mm, diameter d50mm, see Figure 7). Figure 7 Schematic diagram of rolling stick
1-screw; 2-rolling stick; 3--rubber layer; 4-bracket; 5-handle5.11.2 Test steps
Take 3 samples after printing for 48 hours, and use a sharp blade to draw "#" lines on the printed surface, with parallel intervals of 5mm; stick the tape to the printed part of the box, covering an area not less than two-thirds of the printed area, and use a small roller to slowly roll the tape in one direction twice. Pull it open quickly at one end of the tape in a direction about 90° to the box surface. Then check whether the ink falls off.6 Inspection rules
6.1 Batch
Food boxes of the same specification, color, and brand of raw materials are a batch, with a maximum batch of 10,000.6.2 Sampling
Dimension deviation, quality Deviation, appearance, printing and side wall deformation shall adopt the secondary sampling plan of GB2828, and the general inspection level 1 shall be sampled according to the provisions of Table 5. Samples for other inspection items shall be randomly selected from the batch. 6.3 Inspection classification
6.3.1 Factory inspection
The inspection items are dimensional deviation, quality deviation, appearance, side wall deformation, fit, drop, sanitary performance and printing. 6.3.2 Type inspection
Type inspection shall be carried out in one of the following situations: a.
When new products or old products are transferred to the factory for trial production and type identification; when there are major changes in raw materials and technology and new molds are put into production; when the product has been discontinued for a long time and production is resumed; under normal production conditions, once every 6 months; the factory inspection results are consistent with the last type inspection results. f When there are large differences in the inspection; f When the superior quality supervision agency proposes a type inspection requirement. 6.4 Judgment rules
6.4.1 Judgment of sample units
Inspect according to the provisions of Articles 4.1 to 4.4 and Article 4.8. If all items are qualified, the sample unit is qualified. 6.4.2 Judgment of qualified batches
6.4.2.1 For dimensional deviation, quality deviation, appearance, printing, and side wall deformation, take the AQL value of 6.5 as specified in GB2828 to determine whether the batch of products is qualified (see Table 5). And according to the changes in the inspection results, adjust the sampling plan according to the transfer rules specified in GB2828. 6.4.2.2 If both the two tests are qualified, the matching performance is qualified; if one test fails, the matching performance is not qualified. If the performance fails to meet the requirements, the batch of products 16
shall be judged as unqualified.
GB/T5737—1995
If all indicators of the hygienic test are qualified, the hygienic performance is qualified. If one indicator fails to meet the requirements, the hygienic performance is unqualified and the batch of products 6.4.2.3
shall be judged as unqualified.
6.4.2.4If all physical performance tests are qualified, the physical performance is qualified; in the first physical performance test, if all samples of any item meet the requirements, the item is qualified. If unqualified products are produced and the number does not exceed 1, the item shall be tested for the second time. If no unqualified products are produced, the item is still judged as qualified, otherwise it is judged as unqualified. If one physical performance fails to meet the requirements, the batch of products shall be unqualified. Table 5
26～150
151~280
281~500
501~1200
12013200
3201~10 000
7 Marking, packaging, transportation, storage
7.1 Marking
Sample size
Cumulative sample size
Qualified judgment number A.
Unit: piece
Unqualified judgment number R.
Food boxes must be accompanied by a certificate of conformity. The manufacturer's name (mark), trademark, factory address, manufacturing date and inspector code, etc. should be indicated. 7.2 Packaging
Agreed by both the supplier and the buyer.
7.3 Transportation
Avoid rough handling during transportation and prevent mechanical damage. 7.4 Storage
Food boxes should be reasonably stacked and stored indoors, away from sunlight, rain, high temperature, heat and fire. The storage period is two years from the date of production.
Additional remarks:
This standard is proposed by the China Light Industry General Association.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Plastic Products. This standard was drafted by Shanghai Plastic Products Factory No. 3 and Beijing Plastic Factory No. 1. The main drafters of this standard are Li Hengcang and Wu Dezhen. 171 Factory inspection
ShanGuang inspection items include dimensional deviation, quality deviation, appearance, side wall deformation, fit, drop, sanitary performance and printing. 6.3.2 Type inspection
Type inspection should be carried out in any of the following situations: a.
When new products or old products are transferred to the factory for trial production and type identification; when there are major changes in raw materials and Huiyi and new molds are put into production; when the product is discontinued for a long time and production is resumed; under normal production conditions, once every 6 months; when the factory inspection results are significantly different from the last type inspection; f. When the superior quality supervision agency proposes a type inspection requirement. 6.4 Judgment rules
6.4.1 Judgment of sample units
Inspect according to the provisions of Articles 4.1 to 4.4 and Article 4.8. If all items are qualified, the sample unit is qualified. 6.4.2 Determination of qualified batches
6.4.2.1 For dimensional deviation, quality deviation, appearance, printing, and side wall deformation, the AQL value is 6.5 according to the provisions of GB2828 to determine whether the batch of products is qualified (see Table 5). And according to the changes in the inspection results, the sampling plan is adjusted according to the transfer rules specified in GB2828. 6.4.2.2 If both the two tests are qualified, the matching performance is qualified; if one test is unqualified, the matching performance is unqualified, and the batch of products is judged to be unqualified.
GB/T5737—1995
If all the indicators of the hygiene test are qualified, the hygiene performance is qualified; if one indicator is unqualified, the hygiene performance is unqualified, and the batch of products is judged to be unqualified. 6.4.2.3
6.4.2.4 If all physical properties tests are qualified, the physical properties are qualified; in the first physical property test, if all samples of any item meet the requirements, the item is qualified. If there are unqualified products and the number does not exceed 1, the item will be tested for the second time. If there are no unqualified products, the item is still judged as qualified, otherwise it is judged as unqualified. If one of the physical properties is unqualified, the batch of products is unqualified. Table 5
26~150
151~280
281~500
501~1200
12013200
3201~10 000
7 Marking, packaging, transportation, storage
7.1 Marking
Sample size
Cumulative sample size
Qualified judgment number A.
Unit: piece
Number of unqualified judgment R.
Food boxes must be accompanied by a certificate of conformity. The name (mark), trademark, address, manufacturing date and inspector code of the manufacturer should be indicated. 7.2 Packaging
To be agreed upon by both parties.
7.3 Transportation
Avoid rough operation during transportation to prevent mechanical damage. 7.4 Storage
Food boxes should be reasonably stacked and stored indoors, avoiding sunlight, rain, high temperature heat sources and fire sources. The storage period is two years from the date of production.
Additional instructions:
This standard was proposed by the China Light Industry General Association.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Plastic Products. This standard was drafted by Shanghai Plastic Products Factory No. 3 and Beijing Plastic Factory No. 1. The main drafters of this standard are Li Hengcang and Wu Dezhen. 171 Factory inspection
ShanGuang inspection items include dimensional deviation, quality deviation, appearance, side wall deformation, fit, drop, sanitary performance and printing. 6.3.2 Type inspection
Type inspection should be carried out in any of the following situations: a.
When new products or old products are transferred to the factory for trial production and type identification; when there are major changes in raw materials and Huiyi and new molds are put into production; when the product is discontinued for a long time and production is resumed; under normal production conditions, once every 6 months; when the factory inspection results are significantly different from the last type inspection; f. When the superior quality supervision agency proposes a type inspection requirement. 6.4 Judgment rules
6.4.1 Judgment of sample units
Inspect according to the provisions of Articles 4.1 to 4.4 and Article 4.8. If all items are qualified, the sample unit is qualified. 6.4.2 Determination of qualified batches
6.4.2.1 For dimensional deviation, quality deviation, appearance, printing, and side wall deformation, the AQL value is 6.5 according to the provisions of GB2828 to determine whether the batch of products is qualified (see Table 5). And according to the changes in the inspection results, the sampling plan is adjusted according to the transfer rules specified in GB2828. 6.4.2.2 If both the two tests are qualified, the matching performance is qualified; if one test is unqualified, the matching performance is unqualified, and the batch of products is judged to be unqualified.
GB/T5737—1995
If all the indicators of the hygiene test are qualified, the hygiene performance is qualified; if one indicator is unqualified, the hygiene performance is unqualified, and the batch of products is judged to be unqualified. 6.4.2.3
6.4.2.4 If all physical properties tests are qualified, the physical properties are qualified; in the first physical property test, if all samples of any item meet the requirements, the item is qualified. If there are unqualified products and the number does not exceed 1, the item will be tested for the second time. If there are no unqualified products, the item is still judged as qualified, otherwise it is judged as unqualified. If one of the physical properties is unqualified, the batch of products is unqualified. Table 5
26~150
151~280
281~500
501~1200
12013200
3201~10 000
7 Marking, packaging, transportation, storage
7.1 Marking
Sample size
Cumulative sample size
Qualified judgment number A.
Unit: piece
Number of unqualified judgment R.
Food boxes must be accompanied by a certificate of conformity. The name (mark), trademark, address, manufacturing date and inspector code of the manufacturer should be indicated. 7.2 Packaging
To be agreed upon by both parties.
7.3 Transportation
Avoid rough operation during transportation to prevent mechanical damage. 7.4 Storage
Food boxes should be reasonably stacked and stored indoors, avoiding sunlight, rain, high temperature heat sources and fire sources. The storage period is two years from the date of production.
Additional instructions:
This standard was proposed by the China Light Industry General Association.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Plastic Products. This standard was drafted by Shanghai Plastic Products Factory No. 3 and Beijing Plastic Factory No. 1. The main drafters of this standard are Li Hengcang and Wu Dezhen. 17
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