Production technology for high-viscosity CPP self-sticking protection film

Abstract

The invention relates to a production technology for a high-viscosity CPP self-sticking protection film. The production technology includes the steps that firstly, a sticking-resisting layer raw material, a base layer raw material and a sticking layer raw material are added into a single screw extruder to be melted and plasticized, and the raw materials are filtered through a filter and then conveyed into a distributor to be subjected to interlayer proportional distribution; secondly, melts of the three layers of raw materials are conveyed to a die head to be evenly distributed and plasticized and are then extruded through a die lip, and the melts make contact with a main cooling roller to be cooled; thirdly, an obtained cast film is secondarily cooled through an auxiliary cooling roller, and then thickness adjustment is conducted; fourthly, annealing processing is conducted, flaw detection is conducted, and rolling is conducted. The production technology is simple in design, the operation efficiency is high, losses are small, the stability of the product quality is good, and cost is low. By means of the production technology, the prepared high-viscosity CPP self-sticking protection film can have extremely-low shrinkage, the flatness of a film body is good, viscosity is stable, and rolling and unrolling are convenient. In addition, the transparency of the product can be effectively improved, and the occurrence of problems of fish eyes, crystal points, black points, impurities and the like on the film body is inhibited.

Description

technical field [0001] The invention relates to a production process of a three-layer co-extruded casting film, in particular to a production process of a high-viscosity CPP self-adhesive protective film. Background technique [0002] The three-layer co-extruded self-adhesive film seems to have only one layer of structure to the naked eye, but in fact it is formed by combining three layers. There are three flow channels in the film head of the three-layer co-extrusion casting machine, three The flow channel contains formula materials of different components, and the three-layer structure is combined when it reaches the film mouth and is blown out. The final self-adhesive film prepared is a transparent film that looks like one layer but is actually three layers. [0003] This kind of self-adhesive film has a wide range of applications. For example, this kind of self-adhesive protective film is covered on the glass curtain walls of many high-rise buildings, which can effective...

AI Technical Summary

Problems solved by technology

The specific defects of the existing process are: the shrinkage rate of the cast film after extrusion is not well controlled, and problems such as fish eyes, crystal points, black spots, and impurities that are prone to appear in the film body cannot be effectively suppressed

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