A plastic sealing layer is arranged at the inner part of the sealing cover sheet.
在封口盖片的内部设有塑胶密封层。
PE aluminum foil seal film compose of sealing layer, aluminum foil and glue layer. Through heat sealing or induction sealing.
PE铝箔封口膜由密封层、铝箔、胶粘层组成，适用于电磁感应封口，也可用于热封封口。
Composite sealing layer is a combination of connected gravel layer, gravel layer sealing systems, and Micro-surfacing (Slurry seal) system.
复合封层是碎石联结层、碎石封层系统和微表处(稀浆封层)系统的结合。
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