Film stretching device

Abstract

The invention relates to a stretching device. The stretching device comprises a horizontal movement plate, four supporting arms are uniformly and fixedly distributed along the periphery of the horizontal movement plate, and the outer end of each supporting arm is penetratingly provided with a vertical guide shaft through a linear bearing. Four connecting rods uniformly distributed along the periphery of the horizontal movement plate are hinged to the outer edge of the horizontal movement plate, and a slide plate is hinged to the lower end of each connecting rod, slide rails matched with the slide plates are fixedly arranged on a base. The horizontal movement plate is in drive connection with an output screw shaft of a linear motor fixedly arranged on a frame through a screw nut penetratingly arranged at the center of the horizontal movement plate, and the horizontal movement plate is driven to move up and down through rotation of the output screw shaft of the linear motor so as to drive the four slide plates to move along the slide rails. Each slide plate is provided with a cam pressure rod bolt which is capable of tightly pressing a thin film pressure plate on the corresponding slide plate. The stretching device has advantages that synchronous stretching actions in four external expansion directions can be effectively guaranteed, a film stretching ratio can be controlled precisely, film stretching uniformity is improved, and elastic recovery of films is avoided through the screw rod structure.

Description

technical field [0001] The invention belongs to a film stretching test device, in particular to a technology for stretching a film material, in particular to a device for stretching a polypropylene (BOPP) film according to a required stretching ratio. Background technique [0002] The film biaxial stretching machine is a machine that controls the temperature and time to a reasonable range for the thick film samples of crystalline and non-crystalline polymer film materials according to the required stretching ratio, and then conducts a film-forming tensile test. The film stretched by this machine can be used for physical and chemical test analysis in the laboratory, and the types of additives and formulas should be determined according to the properties of the stretched film. Then it is applied to the actual processing production line, which can greatly reduce the cost of trial production. Two-way film stretching has the following requirements: First, when the melting point ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a film stretching device in order to overcome defects such as weak synchronization, incapable of precise control, low production efficiency, uneven stretching, and film damage in the prior art.

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