Process and equipment for continuously producing and molding dual-extrusion current coating plastic clip net film products

Abstract

The invention relates to a process and equipment for continuously producing and molding dual-extrusion current coating plastic clip net film products. The process comprises the following steps of: uniformly stirring raw materials formed by mixing resin, packing and functional aids, and feeding the mixed raw materials into a twin-screw extruder; setting temperature of the extruder and the temperature of a sheet die; controlling the temperature of a die lip; staring the extruder to make a melted material flow out through the sheet die and introduced into a current coating composite roll; introducing woven cloth between two thin films and subjecting the woven cloth to composite forming; and cooling to finalize, performing roller guiding, edge shearing, flattening and finally rolling to form the clip net film product under the traction action of a traction roller. According to the process and the equipment, the melted raw materials are extruded by the twin-screw extruder, plasticized and stretched through current coating, the surface structure of the film is changed, and micropores are formed between base material plastic and packing materials, so that the density of the film is reduced. Thus, the clip net film product produced by the dual-extrusion current coating molding process has low specific gravity and light unit weight under the condition of same proportions, the equipment has a simple and reasonable structure, the production cost is a quarter of that of gluing equipment, and continuous production and molding are realized.

Description

technical field [0001] The invention relates to a preparation process and equipment for plastic film products, in particular to a method and equipment for making advertising light box cloth. Background technique [0002] At present, the production process of advertising light box cloth is divided into the following three types. [0003] 1. Calendering method: [0004] The calendering method is to fully mix PVC powder with liquid plasticizer and other additives, and then bond it with the base cloth into a whole under high temperature and heat pressure. It is characterized by good surface flatness and uniform light transmission, and has advantages in interior lighting. However, limited by the equipment, the width generally does not exceed 3 meters. [0005] 2. Knife scraping method: [0006] The knife-scraping light box fabric process is to apply liquid PVC slurry evenly on the front and back sides of the base fabric with a number of scrapers, and then make it completely c...

AI Technical Summary

Problems solved by technology

This method cannot achieve continuous production, and intermittent production requires a lot of manpower and high production costs; and the investment in rolling equipment is very large

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