Unwinding system and process for low-tensile PVC film

Abstract

The invention relates to an unwinding system for a low-tensile PVC film. The unwinding system comprises an unwinding unit, a preheating unit, a cooling unit, a laminating unit and a winding unit whichare horizontally arranged in sequence, due to the fact that the film materials of an unwinding base can be gradually reduced, the unwinding base can change the speed of the unwinding rotating shaft in real time according to the speed of a roller shaft in the subsequent process, and the phenomena of film material deformation and edge folding are reduced as much as possible. By means of the material characteristics of heat softening and cold hardening of a PVC film material, uneven breadth and wrinkling occurring when the film material is unfolded by the unwinding unit are avoided; after the temperature of the film material is increased by the preheating unit, the film material is softened, and the situations of uneven breadth and wrinkling disappear; the film material enters the cooling unit to be hardened again, and the problems that the whole film material is prone to wrinkling, lotus leaf edges and the like in the unwinding process are solved; then, the film material is laminated with the adhesive sticker through the laminating unit to form a product; and finally, winding of the film material is completed through the winding unit.

Description

technical field [0001] The invention relates to the technical field of film material unwinding, in particular to a low-stretch PVC film unwinding system and a process thereof. Background technique [0002] Polyvinyl chloride, referred to as PVC in English, is a polymer formed by the polymerization of vinyl chloride monomers in peroxides, azo compounds and other initiators; or under the action of light and heat according to the mechanism of free radical polymerization. Vinyl chloride homopolymers and vinyl chloride copolymers are collectively referred to as vinyl chloride resins. PVC is a white powder with an amorphous structure, the degree of branching is small, the relative density is about 1.4, the glass transition temperature is 77-90°C, it begins to decompose at about 170°C, and it has poor stability to light and heat. When exposed to sunlight, it will decompose to produce hydrogen chloride, and further autocatalyze the decomposition, causing discoloration and rapid dec...

AI Technical Summary

Problems solved by technology

[0003] Due to the softness of the PVC film material, when the PVC film material is stretched and produced, it needs to be bonded with the self-adhesive, subject to the uniformity of the extrusion touch head during the forming process of the PVC film material, and various film drawing machines including guide rollers Influenced by various factors such as the stability of machines such as pressure rollers, storage and extrusion, and the wider PVC film material, the entire film material is prone to wrinkle and lotus leaves during the unwinding process.

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