取样方法
Sampling method
去掉缩膜表面 5 层，沿薄膜横向割开，取15层作外观、规格尺寸、物理机械性能及卫生性能试验。
Remove five layers of shrinkage film surface, cut along the film transversely, take 15 layers for appearance, size, physical and mechanical properties and hygienic performance test.
试样状态调节和试验的标准环镜
Standard Ring Mirror for Sample State Adjustment and Testing
在GB/T 2918规定的23℃±2℃，相对湿度 50%±10%的标准环境中进行样品状态调节，时间不少于4h，并在此环境条件下进行试验。
Sample state adjustment was carried out in the standard environment of 23 +2, 50%+10% relative humidity stipulated by GB/T 2918 for no less than 4 hours, and the test was carried out under this environment.
厚度
thickness
按GB/T 6672的规定进行。测量仪器的最小分度值应不大于0.2μm。用最大值、最小值计算厚度极限偏差。平均厚度偏差为平均厚度和公称厚度之差。
According to GB/T 6672. The minimum indexing value of the measuring instrument should not exceed 0.2 um. The maximum and minimum values are used to calculate the thickness limit deviation. The average thickness deviation is the difference between the average thickness and the nominal thickness.
宽度
width
按GB/T 6673 的规定进行。
According to GB/T 6673.
外现
Emergence
在40W 的日光灯下或自然光线下，自测检验。
Self-test under 40 W fluorescent lamp or natural light.
拉伸强度及断裂伸长率
Tensile strength and elongation at break
按GB/T 13022规定进行。采用长条型试样，试样长150mm ，宽15 mm±0.1mm，夹具间距为100mm，拉伸速度为250mm/min±50mm/min。结果取平均值，保留整数。
www.biansongqi.org.cnwww.shidiaoshizi.net.cnwww.shidiaopaifang.cnwww.shidiaoniu.cnAccording to www.shidiaopailou.com.cnwww.shilangan.net.cnGB/T 13022. The strip specimen is 150 mm long, 15 mm wide, 100 mm clamp spacing and 250 mm/min+50 mm/min tensile speed. The results are averaged and integers are retained.
直角撕裂负荷
Right-angle tear load
按 QB/T 1130 的规定进行。结果取平均值，保留一位小数。
According to QB/T 1130. The results were averaged and a decimal was retained.
动摩擦系数
Dynamic friction coefficient
按照GB/T 10006进行。
According to GB/T 10006.
雾度
Haze
按照 GB/T 2410进行。
According to GB/T 2410.
卫生性能
Hygienic properties
按照 GB/T 5009. 60进行。
According to GB/T 5009.60.