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What are the requirements for the appearance quality of aluminized film for composite packaging?

What are the requirements for the appearance quality of aluminized film for composite packaging? The aluminum layer is uniform and bright, without water lines and clouds; the number of pinholes does not exceed 5 per square meter; the coiling is smooth, the tension is appropriate, and there is no serious stretching and gluten. The appearance inspection of aluminized film mainly includes the following aspects: 1. Pinholes, such as poor temperature control of the evaporation boat or poor position of the wire feeding point during aluminizing, will cause the aluminum liquid to sputter, such as sputtering. When the aluminum liquid reaches the film, small pinholes will be formed on the film, and too many pinholes on the aluminized film will cause a decrease in the barrier performance of the film. Under normal circumstances, the number of pinholes allowed in the aluminized film is 2-3 per square meter. 2. Empty plating line, when using a winding vacuum aluminum plating machine to produce aluminized films, if the substrate film is wrinkled in the evaporation area, the film folded inside will not have an aluminum layer attached, so that the aluminized film will not be attached. The area on which the linear aluminum layer is formed is called the empty line. Empty plating lines are mainly produced on soft substrate films such as CPP and PE. 3. The aluminized surface is scratched. This phenomenon is mainly due to the damage of the aluminized layer by the foreign matter on the guide roller during the operation of the aluminized film. For more packaging bag knowledge,

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