Some standard content:
GB/T8947-1998
This standard is a revised version of GB8947-88 "Composite Plastic Woven Bags". This standard is based on the requirements of GB/T1.1--1993 "Guidelines for Standardization Work Unit 1: Drafting and Expression Rules of Standards Part 1: Basic Provisions for Standard Writing" and GB/T1.3---87 "Guidelines for Standardization Work Product Standard Writing Provisions", and has revised the scope of application, technical requirements, test methods, etc. in the original standard, so that products can be assessed by model and unit area quality, making it more serialized. In the technical requirements, the indicators and test methods of sanitary performance and packaging temperature are added. Compared with the original standard, the scope of application of this standard is more reasonable, the technical indicator values are higher, and the test methods are more scientific. From the date of entry into force, this standard will replace GB894788. Appendix A of this standard is the appendix of the standard. This standard is proposed by the China Light Industry Federation.
This standard is under the jurisdiction of the National Technical Committee for Standardization of Plastic Products. The drafting unit of this standard: Changzhou Plastic Weaving General Factory, a joint venture between industry and trade. The main drafters of this standard are Zheng Chazhen and Xu Yajun. 63
1 Scope
National Standard of the People's Republic of China
Composite plastic woven sack
Composite plastic woven sackGB/T8947-1998
Replaces GB8947-88
This standard specifies the product classification, technical requirements, test methods, inspection rules and marking, packaging, transportation and storage requirements of composite plastic woven sacks.
This standard is applicable to composite plastic woven sacks (cloth/film composite is two-in-one, cloth/film/paper composite is three-in-one, and sewing or bonding sewing into bags are respectively called two-in-one bags and three-in-one bags) (hereinafter referred to as bags) made of polypropylene and polyethylene resin as raw materials, extruded and stretched into flat yarns, and then woven into plastic woven cloth (hereinafter referred to as cloth) as the base material, and made by casting method for packaging powdery or granular solid materials and flexible articles.
Cited standards
The clauses contained in the following standards constitute the clauses of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T1039--92 General principles for test methods for mechanical properties of plastics GB/T1040-92
Test method for tensile properties of plastics
Counting sampling procedures and sampling tables for batch inspection (applicable to inspection of continuous batches) GB/T 2828-87
GB/T4857.5-92 Drop test method for packaging and transport packages GB/T5009.60-1996 Analysis method for hygienic standards of polyethylene, polystyrene and polypropylene molded products for food packaging GB/T8808--88 Peel test method for soft composite plastic materials Hygienic standard for polyethylene molded products for food packaging GB 9687-88
Hygienic standard for polypropylene molded products for food packaging GB 9688-88
3 Product classification
3.1 Varieties
3.1.1 According to the main material composition, it can be divided into polypropylene two-in-one bag, polypropylene three-in-one bag, polyethylene two-in-one bag, polyethylene three-in-one bag. 3.1.2 According to the sewing method, it can be divided into sewn bottom bag, sewn edge bottom bag, inserted pocket, and bonded sewn bag (see Figure 1). a) Sewn bottom bag
b) Sewn edge bottom bag
c) Insert pocket
a—Effective length; 6—Effective width
Approved by the State Administration of Quality and Technical Supervision on September 29, 199864
d) Bonded sewn bag
Implemented on May 1, 1999
GB/T8947--1998
The model and allowable loading mass shall comply with the provisions of Table 1. Table 1
Permissible loading mass, kg
3.3 Specifications
3.3.1 The effective width of the bag is divided into 450, 500, 550, 600, 650, 700 mm. If the effective width does not meet the above specifications, it shall be agreed upon by the supply and demand parties. 3.3.2 The effective length of the bag shall be determined by the supply and demand parties through negotiation. 4 Technical requirements
4.1 Appearance quality
The appearance quality shall comply with the provisions of Table 2.
4.2 Substrate size
Technical requirements
Within 100mm interval, the number of missing warp and weft threads shall not exceed 2. The width is 3mm, and the length is 100mm. There shall be no more than 3 folds. There shall be no more than 3 obvious stains less than 100mm2 caused by oil or other reasons. The phenomenon of sewing thread falling off, thread breaking, unsewn folding is not allowed. The phenomenon of insufficient composite width, obvious shedding, air holes or hard blocks is not allowed. When the round bag is double-sided composite, both sides shall be larger than the substrate width by 5mm. 4.3 Allowable deviation
The allowable deviation of the bag shall comply with the provisions of Table 3
Length, mm
Width. mm
Mass per unit area of the bag, g/m
Thickness of composite film, mm
4.4 Physical properties
The physical properties shall comply with the provisions of Table 4.
Allowable deviation
Mass per unit area of fabric, g/m2
Tensile load, N/50mm
Not less than
Peeling force N/30mm
Not less than
Adhesion direction
Seam edge direction
Seam bottom direction
Not less than
Note: Special requirements are determined by negotiation between the supply and demand parties. 4.5 Heat resistance
No abnormality in the heat resistance test.
4.6 Hygienic performance
GB/T 8947-1998
When used for food and medicine packaging, it should comply with the provisions of GB9687 or GB9688. 4.7 Drop test
The packaging is not lost and the packaging bag is not broken.
5 Test method
5.1 Appearance inspection
Visual inspection under natural light.
5.2 Length and width
Flatten the bag and use a ruler accurate to 1mm to measure three places in the middle and 100mm from the edge. The ruler should be parallel to the edge of the bag and the maximum deviation is taken as the test result.
5.3 Unit area mass of the bag
The unit area mass of the bag is calculated according to formula (1): M = Mc + Mz + Ms
-unit area mass of the bag, g/m2;
Where: M-
Mc-unit area mass of cloth, g/m2; Mz--unit area mass of paper, g/m2; Ms---unit area mass of composite film, g/m2. (1)
Flatten the bag and take two pieces of 100cm2 from the upper and lower diagonals of the bag. The outer edge of the sample is 100mm away from the edge of the bag. Weigh the mass with a balance with a minimum graduation value of 0.018, take the arithmetic mean, and calculate the unit area mass deviation according to formula (2). T=Mi-M.
Where: T unit area mass deviation, %; M----mass of 100cm2 sample × 100, g/m; M. -
nominal unit area mass, g/m2.
5.4 Composite film thickness
GB/T 8947—1998
For the test and calculation of composite film thickness, see Appendix A (Appendix to the standard). 5.5 Tensile strength
5.5.1 Test conditions shall be in accordance with GB/T1039. The sample is conditioned at a temperature of 23℃±2C and constant humidity for 4 hours, and the test is carried out under this condition. 5.5.2 The test equipment shall comply with the relevant equipment regulations of Chapter 6 of GB/T1040-92: the distance between the clamps is 200mm, the empty car descending speed is 200mm/min±20mm/min,
5.5.3 Sampling method: Take the sewing roll folding surface of the woven fabric as the sampling surface, and take two samples in the warp direction, weft direction, seam edge direction (bonding direction), and seam bottom direction along the direction of the yarn on each bag according to the position shown in Figure 2. The length is 300mm and the width is 50mm. The seams on both sides of the seam direction sample should be appropriately left long. The flat needle method is shown in Figure 3, and the chain method is shown in Figure 4. Three knots are tied on each side. Unit: mm
Seam edge direction
5.5.4 Record the maximum value of the sample during the stretching process. The test results are expressed as the arithmetic mean, accurate to 10 N. 5.5.5 If the test specimen breaks or slips in the fixture, which affects the accuracy, the specimen should be replaced and repeated. 5.6 Peel strength test
5.6.1 Test in accordance with GB/T8808.
5.6.2 Sample pretreatment and test conditions are the same as those in 5.5.1. 5.6.3 During the test, cut two specimens in the warp and weft directions along the direction of the yarn on the other side of the bag according to the position shown in Figure 2, with a length of 200mm and a width of 30mm. GB/T 8947-1998 Separate the film and cloth by hand or adhesive tape by 50mm at one end of the specimen, and clamp them on the fixture of the test machine, with a distance of 100mm between the fixtures and a test speed of 200 mm/min±20 mm/min. The test results are expressed as arithmetic mean values, accurate to 0.1 N. If the specimen cannot be separated from the film and cloth or paper by hand or adhesive tape, making the test impossible, the specimen is deemed qualified. 5.7 Heat resistance 5.7.1 Spread the bag flat, and take two specimens in the warp and weft directions, with a length of 300mm and a width of 20mm. 5.7.2 Overlap the inner surface and apply a load of 9.8N (1kgf) on it. Put the two-in-one bag into an oven at 80℃ and the three-in-one bag into an oven at 85℃ for 1h. After taking out, immediately separate the two overlapping samples and check whether there are any abnormal conditions such as adhesion and melting marks on the surface. 5.8 Hygienic performance
Perform in accordance with GB/T5009.60.
5.9 Drop test
5.9.1 The test environment is normal temperature and humidity. bZxz.net
5.9.2 Test height
Perform in accordance with Appendix A of GB/T4857.5--92. The test site is a flat cement floor. 5.9.3 The filling factor is 0.80~~0.85.
5.9.4 Test quality and material selection
TA type bag: 20kg of polypropylene, polyethylene resin or materials of equivalent density; A type bag: 25kg of polypropylene, polyethylene resin or materials of equivalent density; B type bag: 40kg of urea or materials of equivalent density; C type bag: 50kg of urea or materials of equivalent density. 5.9.5 Test sequence
Horizontal - Lateral
First line: Longitudinal -
Second line: Horizontal
- Lateral - -
Third line: Lateral - Longitudinal -
6 Inspection rules
6.1 Batch
Products with the same raw materials, the same formula and the same model are grouped as one batch, and each batch shall not exceed 50,000 pieces. 6.2 Sampling
6.2.1 Appearance test samples shall be carried out according to the normal sampling plan specified in GB/T2828. The batch quality shall be expressed by the number of unqualified products per 100 units of products. The general sampling level is I and the qualified quality level (AQL) is 6.5, see Table 5. Table 5
5011 200
1 201 ~3 200
3201~10000
10 001~~35 000
35 001 ~~150 000
Sample size
Number of qualified judgments.A.
Number of unqualified judgments R.
6.2.2 Physical property sampling shall be carried out in batches. Five pieces shall be randomly sampled from each batch, two of which shall be reserved and three pieces shall be sampled and tested according to 5.5.3. 6.3 Inspection classification
6.3.1 Factory inspection items include the contents of 4.1, 4.2, 4.3 and 4.4. 6.3.2 Type inspection
Type inspection items include all the contents of technical requirements. Type inspection should be carried out in any of the following cases: GB/T 8947-1998
a) After formal production, if there are major changes in structure, materials and processes, which may affect product performance; b) During normal production, an inspection is carried out once a year; c) When there is a significant difference between the factory inspection result and the last type inspection result. 6.4 Judgment rules
6.4.1 Quality judgment of sample units
The appearance and deviation of the bag shall be inspected according to the requirements of 4.1 and 4.3. Each bag shall be a sample unit. If all inspection items are qualified, the sample unit shall be qualified.
6.4.2 Quality judgment of qualified batches
6.4.2.1 The appearance and deviation of the bag shall be judged according to Table 5. 6.4.2.2 If there are any unqualified items in the physical properties, double sampling should be done in the original batch, and the unqualified items should be retested. If the retest results are still unqualified, the batch is judged to be unqualified.
6.4.2.3 Heat resistance test
If there are abnormal conditions such as adhesion and melting marks after the heat resistance test, the type inspection is judged to be unqualified. 6.4.2.4 Hygienic properties
If there are any unqualified hygienic properties, the type inspection is judged to be unqualified. 6.4.2.5 Drop test
If the packaging bag is broken and the packaging is lost in the drop test, the type inspection is judged to be unqualified. 7 Marking, packaging, transportation, storage
7.1 Marking
The product packaging should have the manufacturer's name, product name, specifications, quantity, standard number, trademark, production date, etc. 7.2 Packaging
7.2.1 The packaging of the bag should be firm, flat and suitable for transportation. 7.2.2 Each package is not allowed to contain products of different varieties, models and specifications. 7.2.3 Each package is generally divided into 300 or 500 pieces, or it can be decided by negotiation between the supply and demand parties. 7.2.4 Each package contains a product certificate. 7.3 Transportation
During transportation, the bag should not be close to fire or heat sources, and avoid direct sunlight. 7.4 Storage
The bag should be stored in a cool and clean room. The storage period shall not exceed 18 months from the date of manufacture. 69
A1 Test of coating thickness
GB/T8947—1998
Appendix A
(Appendix of the standard)
Test and calculation of coating thickness
A1.1 Sampling method: Cut three pieces of paper, woven fabric and composite two-in-one and three-in-one samples, each with an area of 100cm2. A1.2 Test method: Weigh the mass of the samples respectively with a balance with a minimum division value of 0.01g and take the arithmetic mean. Calculation of lamination thickness
m - mo - mz × 10
Lamination thickness, mm;
Where:—
The mass of two-in-one or three-in-one per square centimeter, g/cm; m-
mc-The mass of unlaminated woven fabric per square centimeter, g/cm?; mz
-The mass of unlaminated paper per square centimeter, g/cm2; D The density of the composite film, g/cm2.
...(A1)A.
Number of unqualified judgments R.
6.2.2 Physical property sampling is based on batches. Five samples are randomly sampled from each batch, two of which are reserved and three are sampled and tested according to 5.5.3. 6.3 Inspection classification
6.3.1 Factory inspection items are the contents of 4.1, 4.2, 4.3 and 4.4. 6.3.2 Type inspection
Type inspection items are all the contents of technical requirements. Type inspection should be carried out in any of the following situations: GB/T 8947-1998
a) After formal production, if there are major changes in structure, materials and processes, which may affect product performance; b) During normal production, inspection is carried out once a year; c) When the factory inspection results are significantly different from the last type inspection. 6.4 Judgment rules
6.4.1 Quality judgment of sample unit
The appearance and deviation of the bag shall be inspected according to the requirements of 4.1 and 4.3. Each bag shall be a sample unit. If all the inspection items are qualified, the sample unit shall be qualified.
6.4.2 Quality judgment of qualified batch
6.4.2.1 The appearance and deviation of the bag shall be judged according to Table 5. 6.4.2.2 If there are unqualified items in physical properties, double sampling shall be taken from the original batch and the unqualified items shall be retested. If the retest results are still unqualified, the batch shall be judged unqualified.
6.4.2.3 Heat resistance test
If there are abnormal conditions such as adhesion and melting marks after the heat resistance test, the type inspection shall be judged to be unqualified. 6.4.2.4 Hygienic properties
If there are unqualified items in the hygienic properties, the type inspection shall be judged to be unqualified. 6.4.2.5 Drop test
If the packaging bag breaks and the packaging leaks during the drop test, the type inspection is judged as unqualified. 7 Marking, packaging, transportation, storage
7.1 Marking
The product packaging should have the manufacturer's name, product name, specifications, quantity, standard number, trademark, production date and other information. 7.2 Packaging
7.2.1 The packaging of the bag should be firm and flat, suitable for transportation. 7.2.2 Each package is not allowed to have products of different varieties, models and specifications. 7.2.3 Each package is generally divided into 300 or 500 pieces, or it can be decided by negotiation between the supply and demand parties. 7.2.4 There is a product certificate in each package. 7.3 Transportation
During transportation, the bag should not be close to fire or heat sources, and should be avoided from direct sunlight. 7.4 Storage
The bags should be stored in a cool and clean room. The storage period shall not exceed 18 months from the date of leaving the factory. 69
A1 Test of film thickness
GB/T8947—1998
Appendix A
(Appendix of the standard)
Test and calculation of film thickness
A1.1 Sampling method: Cut three pieces of paper, woven cloth and composite two-in-one and three-in-one samples respectively, each with an area of 100cm2. A1.2 Test method: Weigh the mass of the samples respectively with a balance with a minimum division value of 0.01g and take the arithmetic mean. Calculation of lamination thickness
m - mo - mz × 10
Lamination thickness, mm;
Where:—
The mass of two-in-one or three-in-one per square centimeter, g/cm; m-
mc-The mass of unlaminated woven fabric per square centimeter, g/cm?; mz
-The mass of unlaminated paper per square centimeter, g/cm2; D The density of the composite film, g/cm2.
...(A1)A.
Number of unqualified judgments R.
6.2.2 Physical property sampling is based on batches. Five samples are randomly sampled from each batch, two of which are reserved and three are sampled and tested according to 5.5.3. 6.3 Inspection classification
6.3.1 Factory inspection items are the contents of 4.1, 4.2, 4.3 and 4.4. 6.3.2 Type inspection
Type inspection items are all the contents of technical requirements. Type inspection should be carried out in any of the following situations: GB/T 8947-1998
a) After formal production, if there are major changes in structure, materials and processes, which may affect product performance; b) During normal production, inspection is carried out once a year; c) When the factory inspection results are significantly different from the last type inspection. 6.4 Judgment rules
6.4.1 Quality judgment of sample unit
The appearance and deviation of the bag shall be inspected according to the requirements of 4.1 and 4.3. Each bag shall be a sample unit. If all the inspection items are qualified, the sample unit shall be qualified.
6.4.2 Quality judgment of qualified batch
6.4.2.1 The appearance and deviation of the bag shall be judged according to Table 5. 6.4.2.2 If there are unqualified items in physical properties, double sampling shall be taken from the original batch and the unqualified items shall be retested. If the retest results are still unqualified, the batch shall be judged unqualified.
6.4.2.3 Heat resistance test
If there are abnormal conditions such as adhesion and melting marks after the heat resistance test, the type inspection shall be judged to be unqualified. 6.4.2.4 Hygienic properties
If there are unqualified items in the hygienic properties, the type inspection shall be judged to be unqualified. 6.4.2.5 Drop test
If the packaging bag breaks and the packaging leaks during the drop test, the type inspection is judged as unqualified. 7 Marking, packaging, transportation, storage
7.1 Marking
The product packaging should have the manufacturer's name, product name, specifications, quantity, standard number, trademark, production date and other information. 7.2 Packaging
7.2.1 The packaging of the bag should be firm and flat, suitable for transportation. 7.2.2 Each package is not allowed to have products of different varieties, models and specifications. 7.2.3 Each package is generally divided into 300 or 500 pieces, or it can be decided by negotiation between the supply and demand parties. 7.2.4 There is a product certificate in each package. 7.3 Transportation
During transportation, the bag should not be close to fire or heat sources, and should be avoided from direct sunlight. 7.4 Storage
The bags should be stored in a cool and clean room. The storage period shall not exceed 18 months from the date of leaving the factory. 69
A1 Test of film thickness
GB/T8947—1998
Appendix A
(Appendix of the standard)
Test and calculation of film thickness
A1.1 Sampling method: Cut three pieces of paper, woven cloth and composite two-in-one and three-in-one samples respectively, each with an area of 100cm2. A1.2 Test method: Weigh the mass of the samples respectively with a balance with a minimum division value of 0.01g and take the arithmetic mean. Calculation of lamination thickness
m - mo - mz × 10
Lamination thickness, mm;
Where:—
The mass of two-in-one or three-in-one per square centimeter, g/cm; m-
mc-The mass of unlaminated woven fabric per square centimeter, g/cm?; mz
-The mass of unlaminated paper per square centimeter, g/cm2; D The density of the composite film, g/cm2.
...(A1)
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.