Cast sheet forming cooling device and cooling method for film production line

Abstract

The present invention aims to provide a cast sheet forming cooling device for a film production line, which includes a die head, a sheet attaching device, a water tank, a peeling roller device and a chilling roller installed in the water tank; it also includes a water inlet pipe, a water spray pipe and a water spray pipe The water spray hole on the pipe also includes an overflow pipe arranged in the water tank, and the overflow pipe communicates with the water inlet pipe after passing through the filtering device and the cooling device. The present invention also provides a cast sheet forming cooling method for a thin film production line. The cooling roll dewatering device ensures that both sides of the thick sheet are cooled quickly and uniformly at the same time, so that the crystallinity of the thick sheet is small and the properties of both sides are close. It provides a high-quality intermediate product of the thick sheet for the next stretching process. The thick sheet is applied , can be stretched to make a film with a width of 10m or a thickness of 400μm.

Description

technical field [0001] The invention relates to a plastic film production line, in particular to a casting cooling device and cooling method for a casting machine. Background technique [0002] In the plastic film production process, after the high-temperature polymer melt leaves the die, it is quickly attached to the surface of a low-temperature, high-gloss, chrome-plated chilled roll with the help of the external force of the attaching device for cooling and forming. Because the high-temperature melt and the chilling roller can conduct heat exchange in time, the melt is rapidly cooled, and when it is peeled off by the stripping roller device, it forms a solid thick sheet. This process is called the casting process. At present, the cooling method commonly used in the casting process is the chilled roll method, that is, cooling water is passed into the chilled roll, and the polymer high-temperature melt extruded through the die is quickly attached to the sheet by means of th...

AI Technical Summary

Problems solved by technology

This technology belongs to double-sided cooling, but due to the large volume of the water tank, the water temperature in the water tank cannot always be consistent with the surface temperature of the chilled roller, the cooling effect will not meet the requirements, and it will still have a great impact on the forming quality of thick sheets

Especially when preparing large-width or thick thin films, the quality of thick films will have a greater impact. Even a little flaw or defect in production will make the quality of the final product unqualified, and even cause continuous film breakage. Can't make it at all

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