1、外卖打包袋的贴膜外观是检查贴膜的平整度和厚度，两面是否有锯齿。薄膜厚度一般在±5um以内为合格品。如果厚度过大，会造成包装印刷图案设计印刷的起伏和复合涂层的对称性。目视检查薄膜两面的锯齿形，会在包装、印刷、复合等过程中造成薄膜破损，造成大量损坏。常用的膜厚检测方法有涂层测厚仪和目测法。原膜的静、动摩擦阻力应用膜的摩擦阻力仪检查。

1. The appearance of the film on the takeaway bag is to check the flatness and thickness of the film, and whether there are serrations on both sides. The film thickness is generally within ± 5um. If the thickness is too large, it will cause the fluctuation of packaging and printing pattern design and printing and the symmetry of composite coating. Visual inspection of the zigzag shape on both sides of the film may cause damage to the film during the process of packaging, printing and compounding, resulting in a large amount of damage. Commonly used film thickness measurement methods include coating thickness gauge and visual method. The static and dynamic friction resistance of the original membrane shall be checked with the membrane friction resistance meter.

2、薄膜的电晕值直接影响油墨的附着力和复合后的抗拉强度。（电晕笔，自带电晕液均可）有的包装袋有一些标注不规范：一是没有标注微波加热信息，没有标注加热温度，只有“可以微波加热”；二、警告信息为否，加热时没有标明是否可以加热。直接接触食物等；此外，还存在产品执行标准标注错误的情况。国产品牌普遍比进口品牌便宜，但特性并不逊色于后者。

2. The corona value of the film directly affects the adhesion of the ink and the tensile strength of the composite. (Corona pen and self-contained corona liquid) some packaging bags have some nonstandard labels: first, there is no microwave heating information, no heating temperature, only "microwave heating is allowed"; 2、 The warning message is no, and it is not indicated whether it can be heated during heating. Direct contact with food, etc; In addition, there are errors in product implementation standards. Domestic brands are generally cheaper than imported brands, but their characteristics are not inferior to the latter.

特别需要注意的是，聚乙烯（PVC）的相关标准要标注：“请勿与油性食品接触”，这是因为PVC保鲜袋与油性食品接触会析出更多的化合物。，对健康造成安全隐患。6批次PVC保鲜袋进行油类模拟实验时，总转移量为15-38mg/dm2（标准规定不超过10mg/dm2，数值越低越安全这是）。这进一步证实了PVC制成的外卖打包袋塑料制品不适合接触油性食品。不同的材料具有不同的抗拉强度和高阻隔性。

It should be noted that the relevant standards of polyethylene (PVC) should be marked: "do not contact with oily food", because PVC fresh-keeping bags will release more compounds when contacting with oily food., Potential safety hazard to health. When 6 batches of PVC fresh-keeping bags were tested for oil simulation, the total transfer amount was 15-38mg/dm2 (the standard specified that it should not exceed 10mg/dm2, and the lower the value, the safer it is). This further confirmed that the plastic products of take away bags made of PVC were not suitable for contacting oily food. Different materials have different tensile strength and high resistance.

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