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National standard for plastic woven bags

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Tags: national standard for plastic woven bags, GB /t8946-2013
date: 2008-08-22
5.5.4 record the tensile load of the sample and take its arithmetic mean
5.5.5 during the test, if the sample is broken or slipped in the fixture, which affects the accuracy, it shall be replaced and redone
5.6 heat resistance
5.6.1 take two warp and weft samples from the bag, 300mm long and 20mm wide
5.6.2 overlap its surface, apply a load of 9.8 N on it, put it into an oven at 80 ℃ for 1h, and immediately separate the two overlapping samples after taking them out to check whether there are abnormal conditions such as adhesion and dissolution marks on the surface
5.7 drop resistance
5.7.1 the test environment is normal temperature and humidity
5.7.2 the test site is flat cement ground
5.7.3 the filling factor is 0.80 ~ 0.85
5.7.4 the test quality and materials shall be 20kg polypropylene, polyethylene resin or materials with equivalent density in Ta bags
a 25kg polypropylene, polyethylene resin or materials with equivalent density are packed in bags
type B bags contain 40kg urea or materials with equivalent density
type C bags contain 50kg urea or materials with equivalent density
5.7.5 test sequence
Article 1: longitudinal – horizontal – lateral
Article 2: horizontal – lateral – longitudinal
Article 3: lateral – longitudinal – Horizontal
5.7.6 place the sample at a height of 1.2m and conduct three drop tests according to the sequence specified in 5.7.5 to check whether there is bag rupture and package leakage
5.8 hygienic performance
according to GB /t5009 60
6 inspection rules
6.1 group batch
products of the same model and specification are one batch, with no more than 150000 pieces in each batch
6.2 sampling
6.2.1 the appearance and deviation of bags shall be determined according to the one-time normal sampling scheme specified in GB /t2828 (see Table 5). Each woven bag is a sample unit. Batch range sample size qualified judgment number AC unqualified judgment number RC 501-1200 32 3 6 1201-3200 50 7 8 3201-10000 80 10 11 10001-35000 125 14 35001-150000 120 21 22 6.2.2 5 pieces of tensile load are randomly sampled from each batch, of which 2 are for standby and 3 are sampled and determined according to 5.5.3
6.6.3 other inspection items shall be sampled randomly according to Chapter 5, and the number of samples shall meet the test requirements of the required items
6.3 inspection classification
6.3.1 factory inspection items are tensile loads in 4.1.2 and 4.3
6.3.2 type inspection
type inspection items are all items in the technical requirements. Generally, they are inspected once a year. In one of the following cases, type inspection shall be carried out:
A) trial production and finalization appraisal of new or old products transferred to factories
b) after formal production, if there are major changes in structure, material and process that may affect product performance
C) when production resumes after long-term shutdown
d) when the delivery inspection result is quite different from the last type inspection
e) the national quality supervision organization puts forward the requirements for type inspection
6.4 judgment rules
6.4.1 quality judgment of sample unit
the appearance and deviation of bags shall be inspected according to 4.1 and 4.2. If all items are qualified, the sample unit is qualified
6.4.2 quality determination of qualified batch
6.4.2.1 the appearance and deviation of bags are determined according to the provisions of GB /t2828. The batch quality is expressed by the number of nonconforming products per 100 units of products. The general inspection level is I and the qualified quality level (AQL) is 6.5. See table 5 for specific provisions
6.4.2.2 if there are unqualified items in the tensile load test, double samples shall be taken from the original batch for re inspection of the unqualified items. If the re inspection results are all qualified, the batch is determined to be qualified
6.4.2.3 heat resistance test
if the heat resistance test is unqualified, the type inspection is unqualified
6.4.2.4 drop test
if the drop test is unqualified, the type inspection is unqualified
6.4.2.5 hygienic performance
if the hygienic performance index is unqualified, the type inspection is unqualified
7 marks, packaging, transportation and storage
7.1 marks
the product package shall contain the manufacturer’s name, product name, specification, quantity, standard number, trademark, date of manufacture, etc. Special requirements shall be decided by both parties through negotiation
7.2 packaging
7.2.1 bag packaging shall be firm, flat and suitable for transportation
7.2.2 the number of packages per package shall be determined by the supplier and the demander through negotiation
7.2.3 each package should have a product certificate
7.3 transportation
the bags should be loaded and unloaded with care during transportation, avoid sun and rain, and keep the packaging intact
7.4 storage
the bag shall be stored in a cool and clean room, and the storage period shall not exceed 18 months from the date of manufacture

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