Method and device for regulating the vacuum supply of calibration tools

Abstract

The invention relates to a method for vacuum supply of a calibration tool (4a, 4b; 5a, 5b), comprising at least one dry calibration tool (4a, 4b) and at least one calibration tank (5a, 5b). According to the method described, at least one vacuum pump (17a, 17b, 17c, 17d) is required to be connected to the calibration tool (4a, 4b; 5a, 5b) in order to extract air from the calibration tool (4a, 4b; 5a, 5b), Adjust the pressure in the calibration tool (4a, 4b; 5a, 5b) to the nominal value through the regulating valve (13, 15). The purpose of the invention is to reduce energy consumption and improve the quality of produced profiles. In order to achieve this purpose, a plurality of vacuum pumps (17a, 17b, 17c, 17d) extract air from a common pressure vessel (16) and draw air from at least one dry in said common pressure vessel (16) through a first regulating valve (13). The calibration tool (4a, 4b) extracts air and, in addition, air is extracted from at least one calibration tank (5a, 5b) in the common pressure vessel (16) via a second regulating valve (15). Furthermore, the invention relates to a device for carrying out said method.

Description

technical field [0001] The present invention relates to a method of regulating the vacuum supply of a calibration tool, comprising at least one dry calibration tool and at least one calibration tank, in order to extract air from the calibration tool, at least one vacuum pump is required to be connected to the calibration tool, wherein the pressure inside the calibration tool is passed through The regulating valve is adjusted to the nominal value. Background technique [0002] In order to calibrate and cool the produced profiles, extrusion lines for plastic profiles usually comprise an extruder with an extrusion nozzle to which a calibration tool is connected. A so-called dry calibration tool is usually installed directly downstream of the extrusion nozzle, usually a water-cooled metal block is profiled to match the calibration tool opening, which is connected to the side vacuum slot. The vacuum slot is connected with the vacuum pump. In order to make the profile press the w...

AI Technical Summary

Problems solved by technology

This results in the disadvantage that in most operating states of the vacuum pump a too strong vacuum is generated which must be reduced accordingly in order to reduce damage to the profile

[0004] Although it is possible to maintain the pressure inside the tool at the set pressure level using the method described, the energy consumption is relatively high

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