Widening process and apparatus for rolled plastic film and sheet

Abstract

The present invention relates to a process and facility for stretching plastic films and sheets by calendering. The stretching equipment in the known calendering method is horizontally arranged, and its disadvantage is that the projection surface of the horizontal plane is too large, due to the weight of plastic films and sheets The reason is that the horizontal width is too wide to sag and be vertically stretched by its own weight, so that the flatness of the plastic film and the sheet product is not good after being shaped, which limits the width of the finished product to be too wide. Wheels, guide wheels, widening equipment, clamping force tensioning system, tempering wheel and cooling wheel set, the widening equipment is changed from the original horizontal placement to the inclined placement, and the additional installation adopts the counterweight wheel With advanced clamping force tensioning system and adjustable guide wheels up and down, the improved stretching equipment can produce wide products with better flattening and width between 4200mm-16000mm.

Description

technical field [0001] The invention relates to a stretching and widening process and equipment for plastic films, in particular to an on-line film and sheet widening process and device using a calendering method. Background technique [0002] In the production process of plastic film and sheet, especially in the calendering method, the width of the widened product determines its application range. Therefore, the equipment for producing wide-width stretched film determines its plastic film. 1. The application field of thin film is wide, which puts forward higher requirements for the equipment itself, and also shows that it is difficult to produce wide-width film stretching equipment. [0003] The currently known widening equipment of the calendering method is horizontally configured: the sequence is calender roll → drawing wheel leads to longitudinal stretching → widening equipment transverse stretching → warming wheel relieves cooling → cooling wheel group cooling and shapi...

AI Technical Summary

Problems solved by technology

However, this kind of horizontal calendering widening equipment also has shortcomings, and it has limitations in improving the width of plastic films and sheets and the flattening of products. In the process, due to the high temperature of the plastic film and sheet, it has not yet been finalized, and the surface has a sticking phenomenon. Therefore, except that the plastic film and sheet are clamped and transported by the tape other than the clamping wheel on both sides, a large area is suspended in the middle, and the horizontal projection surface is too large. Due to the weight of the plastic film and sheet, if the horizontal width is too wide, it will sag and be stretched vertically by its own weight, which will cause the plastic film and sheet products to have poor flattening, bulge in the middle, and inward curling on both sides, which will affect the quality of the product.

In order to ensure product quality, this type of widening method cannot produce too wide a finished product, only within 4000mm, which cannot meet the market's requirements for wide-width products

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