Feeding mechanism for feeding polytetrafluoroethylene membrane into chain clamping device

Abstract

The invention provides a feeding mechanism for horizontal extension production of polytetrafluoroethylene filter membrane, which has stable and reliable tension and speed, flat and no-damaged feeding via a longitudinal extension base band, and simple operation. The feeding mechanism comprises a supporting plate arranged between opposite static clamping plates, a pressure plate is arranged above the supporting plate, and clearance through which the polytetrafluoroethylene membrane can pass is arranged between the pressure plate and the supporting plate; the feeding mechanism further comprises an unwinding device for feeding the polytetrafluoroethylene membrane into the clearance with constant linear speed and constant tension; and two pairs of shearing rolls positioned at two sides of the polytetrafluoroethylene membrane are arranged between the unwinding device and the supporting plate, wherein each pair of shearing rolls is composed of an upper roll and a lower roll which are used for clamping a side part of the polytetrafluoroethylene membrane and parallel to each other.

Description

technical field [0001] The invention relates to a feeding mechanism for polytetrafluoroethylene membrane horizontal drawing production, and belongs to the technical field of processing and manufacturing polytetrafluoroethylene microporous filter membranes, in particular to the field of manufacturing polytetrafluoroethylene membranes for air filtration, clothing membranes and water filtration. Background technique [0002] For polytetrafluoroethylene microporous membranes, biaxial stretching is often used at home and abroad to manufacture them. The main process is as follows: first, the polytetrafluoroethylene powder is mixed with suitable additive oil in proportion to form a paste, and the The blank machine makes a cylindrical blank, puts it into the pusher and extrudes it into a cylindrical shape with a certain diameter under a certain pressure, and enters the calender through the guide to be pressed into a calendered sheet, and then undergoes degreasing, longitudinal drawin...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the PTFE film horizontal drawing feeding mechanisms researched and produced at home and abroad only include an unwinding device and a feeding port that can be adjusted internally and externally. Wrinkled, curled, scratched, and because the chain clips are clamped by gravity, the clamping and uniform force cannot be truly achieved, and film clipping and holes are prone to occur

Moreover, due to the contact and stretching of the baseband by human hands, it is very easy to cause damage to the baseband

In this way, it is impossible to produce a polytetrafluoroethylene membrane with uniform thickness and pore size, which is precisely controllable, and the production efficiency is low, the cost is high, and the labor intensity of the workers is high.

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