我站两低储粮,多年来均采用的国产0.14——0.16毫米厚的聚氯乙烯无色薄膜进行粮面密封,但此薄膜可能是在卷筒时,由于工艺上的原故,中部较两边缘卷得紧,当薄膜打开后,其边缘长度超过中部平均长度的1.7%,因此两边缘各约25公分宽自然形成波浪式皱纹.这种自身固有的皱纹,在合缝粘接、覆盖密封时,难度大,粘接不牢,裂 I stand two low storage grain, used for many years made of 0.14--0.16 mm thick polyvinyl chloride colorless film for food surface sealing, but this film may be in the reel, due to the process of the reason, the central two When the film is opened, its edge length exceeds 1.7% of the average length of the middle part, so corrugated wrinkles naturally form about 25 cm wide at both edges, and this inherent wrinkle is adhered and covered by the seams When difficult, the bonding is not strong, cracked