Continuous online coating and coiling process for color-coated steel coils

Abstract

The invention relates to a continuous online coating and a coiling process for color-coated steel coils. The problems of defects such as deformations and small bubble folds in the continuous online coating process of the existing color-coated steel coils and collapsed coils or peach-heart coils easily produced in the coiling process are solved. Coating pressure and tension are effectively controlled, and different coiling unit tensions are selected at different coiling moments at the same time, so that problems can be effectively avoided. The continuous online coating and coiling process provided by the invention is simple has good coating effect, and can achieve continuous online cold coating of color-coated strip steel; problems of defects of pulled and deformed films or pulled and broken films or loosened films on the surface of the color-coated strip steel, small bubbles, various folds and the like are solved; the collapsed coils or the peach-heart coils can be avoided in the color-coated steel coils after the color-coated steel coils are coiled; and therefore horizontal type packaging and shipment standards are fully met.

Description

technical field [0001] The invention relates to a film-attaching process in the metallurgical industry, in particular to a continuous online film-attaching and coiling process for color-coated steel coils. Background technique [0002] Color-coated steel sheet (referred to as color-coated sheet) is an organic-coated steel sheet, also known as a pre-coated steel sheet. It is based on metal strip steel (such as cold-rolled steel sheet, hot-dip galvanized sheet, electro-galvanized sheet, etc.) through strict process control, and coated with various polymer coatings (such as polyester, silicone modified Polyester, polyvinylidene fluoride resin, polyvinyl chloride, acrylic resin, epoxy resin, etc.), and paste protective films of various plastic materials (such as polyvinyl chloride film, polyethylene film, etc.) in the final process - that is, The products made after cold laminating, as customers' usage of the products continue to increase, some new high value-added color-coated...

AI Technical Summary

Problems solved by technology

[0003] 1) In the film laminating process before coiling, the length of the ordinary color-coated plate is usually within 2 meters, so it can be cold-laminated piece by piece under static conditions, and the tension and pressure of the film are easy to control; the color-coated steel strip is usually as long as 1000 More than one meter, the maximum can reach 3000 meters, due to the limitation of the film lamination unit, production line and site, static film lamination cannot be carried out, so it is hoped to adopt the method of online continuous film lamination for cold film lamination, because the running speed of the conveyor belt will vary with the strip steel manufacturing process 1. The thickness of the strip fluctuates at any time. How to keep the tension of the film in the moving state of the color-coated strip to match the height of the moving tension of the color-coated strip running online is particularly important. If the tension of the film is too large, the film The force between the steel strip and the strip is too large, causing the film to be deformed or even broken; on the contrary, if the tension is too small, the film will loosen and produce defects such as small bubbles and various wrinkles on the surface of the color-coated steel strip. The film will be wrapped around the equipment along the way, causing the entire unit to stop running; 2) After coiling, due to the low friction coefficient of the surface due to the cold film, it is prone to collapse. In order to solve the problem of collapse, if the tension is increased blindly, then It is easy to deform the steel coil under pressure, and it is prone to the problem of heart coil; some enterprises such as Baosteel use vertical packaging and transportation after the coil is turned over to prevent the collapse of the coil, but this will increase the packaging and transportation costs of the steel coil. The logistics and transportation systems of many companies do not support the packaging and transportation solutions of vertical steel coils, which brings problems in the packaging and transportation of color-coated steel coils

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