Polypropylene bidirectional stretching film production line

Abstract

The invention belongs to the technical field of polypropylene film production, and particularly relates to a polypropylene bidirectional stretching film production line. The polypropylene bidirectional stretching film production line comprises a sealing cover, an outer cylinder, connecting pipes, a buffering spring and a filtering cylinder; the buffering spring is fixed to the inner bottom of theouter cylinder; the filtering cylinder is fixed to the upper end of the buffering spring; and a material inlet is formed in the upper end of the side of the outer cylinder. According to the polypropylene bidirectional stretching film production line, the sealing cover with a pressing plate is arranged, the pressing plate is descended by pressing a guide rod downwards; the pressing plate presses the filtering cylinder downward; the filtering cylinder is descended; the filtering cylinder is rebounded upwards under the action of the elastic force of the buffering spring, which makes impurities inthe filtering cylinder fall off, and avoid blockage that affects the filtering efficiency; the sealing cover is opened; the filtering cylinder extends out upwards under the action of the elastic force of the buffering spring, which facilitates withdrawing and replacing; the connecting pipes are connected between each of the material inlet and a material outlet of the outer cylinder; and each connecting pipe is in an structure that one end close to the outer cylinder is inclined upward, so that the materials in the material inlet and the material outlet are prevented from refluxing into the filtering cylinder to cause inconvenience in the replacement of the filtering cylinder.

Description

technical field [0001] The invention belongs to the technical field of polypropylene film production, and in particular relates to a polypropylene biaxially stretched film production line. Background technique [0002] Polypropylene is a thermoplastic resin produced by the polymerization of propylene. According to the arrangement of the methyl group, it can be divided into three types: isotactic polypropylene, atactic polypropylene and syndiotactic polypropylene. [0003] When the methyl groups are arranged on the same side of the molecular main chain, it is called isotactic polypropylene. If the methyl groups are arranged randomly on both sides of the molecular main chain, it is called atactic polypropylene. When the methyl groups are arranged alternately on both sides of the molecular main chain, it is called interstitial polypropylene. Regular polypropylene. In the polypropylene resin produced in general industry, the isotactic structure content is about 95%, and the re...

AI Technical Summary

Problems solved by technology

The disadvantage is poor low temperature impact resistance and easy aging, but it can be overcome by modification

[0004] The existing technology has the following problems: the melt filter used in the existing polypropylene biaxially stretched film production line has material backflow during use, which easily causes secondary pollution, and it is inconvenient to replace the filter cartridge. At the same time, the filter cartridge is fixed and can be filtered for a long time It is easy to cause blockage. When putting the filter cartridge into the outer cylinder, if the centers of the two are not aligned, it will be difficult to put the filter cartridge into the outer cylinder, reducing the filtration efficiency

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