Test Method:

Sampling method
Remove the three surface layers from the test film roll, and cut about 20 layers along the width of the film roll for appearance, specification and physical properties testing. Roll the paper core to prevent contamination of the sample.
Standard environment for sample condition regulation and testing
According to GB/T 2918. Standard environment (23/50), tolerance deviation level is 2. The state adjustment time is not less than 4h, and the test is carried out under this condition.
Width and length
According to GB/T 6673.
thickness
According to GB/T 6672.
The accuracy of the measuring instrument is little or equal to 0.2μm. The maximum deviation value is used to calculate the thickness deviation.
The average thickness is the arithmetic average of the thickness of the measured points. The average thickness deviation is the percentage of the difference between the average and nominal thickness to the ratio of the nominal thickness.
appearance
Flatten in natural light or light and visually inspect. The end winding irregularity was measured with a gauge with an accuracy of 0.5 mm.
Tensile strength and elongation at break
According to GB/T 13022. The sample is a long strip with a length of 150mm and a width of (15± 0.1 mm). The fixture spacing was 100 mm, and the test speed was (250±25)mm/min.
The fog is carried out according to the provisions of GB/ DIN 2410. 6.9 Gloss shall be carried out according to GB/T 8807. The Angle of incidence is 45 0. 6.10 The friction coefficient shall be carried out according to GB/ DIN 10006.
The tensile modulus of elasticity is specified in GB/T 13022. 6.13 Wetting tension shall be carried out according to GB/T 14216.
Sanitary performance shall be carried out according to GB/T 5009.60

Test Rule:

Lot grouping
The same raw materials, the same process conditions and the same specification of continuous production of no more than one week of film is a batch, each batch is not more than 200t.
sample
Physical and mechanical properties and sanitary properties Take one roll from each batch of products.
Ex-factory inspection
The ex-factory inspection is all the items in the technical requirements except moisture permeability and sanitary performance.
Type inspection
Type inspection is all items in the technical requirements. Type inspection shall be carried out under any of the following circumstances:
a) New product or old product conversion production of trial type appraisal;
b) After the formal production, such as the structure, material, process has a large change, may affect the performance of the product;
c) During normal production, it shall be inspected once every six months;
d) When the product is resumed after a long period of suspension;
e) When the factory inspection results are significantly different from the last type inspection;
f) When the national quality supervision authority makes a request for type inspection.
Determination of qualified items
If the size deviation and appearance of the film are unqualified, the volume is unqualified. If one of the physical and mechanical properties of the film test results is unqualified, the sample should be redoubled in the original batch, and the unqualified items are rechecked. If the retest results are still unqualified, the physical and mechanical properties are unqualified.
Hygienic performance
If one item is not qualified, the hygiene performance is not qualified.
Determination of qualified lot
If the physical and mechanical properties and sanitary properties are all qualified, the batch is judged to be qualified.
Determination of quality level
The determination of product quality grade shall be based on the lowest grade of all project inspection results.