1、外賣打包袋的貼膜外觀是檢查貼膜的平整度和厚度，兩面是否有鋸齒。薄膜厚度一般在±5um以內為合格品。如果厚度過大，會造成包裝印刷圖案設計印刷的起伏和復合涂層的對稱性。目視檢查薄膜兩面的鋸齒形，會在包裝、印刷、復合等過程中造成薄膜破損，造成大量損壞。常用的膜厚檢測方法有涂層測厚儀和目測法。原膜的靜、動摩擦阻力應用膜的摩擦阻力儀檢查。

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、薄膜的電暈值直接影響油墨的附著力和復合后的抗拉強度。（電暈筆，自帶電暈液均可）有的包裝袋有一些標注不規范：一是沒有標注微波加熱信息，沒有標注加熱溫度，只有“可以微波加熱”；二、警告信息為否，加熱時沒有標明是否可以加熱。直接接觸食物等；此外，還存在產品執行標準標注錯誤的情況。國產品牌普遍比進口品牌便宜，但特性并不遜色于后者。

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.

特別需要注意的是，聚乙烯（PVC）的相關標準要標注：“請勿與油性食品接觸”，這是因為PVC保鮮袋與油性食品接觸會析出更多的化合物。，對健康造成安全隱患。6批次PVC保鮮袋進行油類模擬實驗時，總轉移量為15-38mg/dm2（標準規定不超過10mg/dm2，數值越低越安全這是）。這進一步證實了PVC制成的外賣打包袋塑料制品不適合接觸油性食品。不同的材料具有不同的抗拉強度和高阻隔性。

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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