A material bidirectional stretching device

Abstract

The invention discloses a bidirectional stretching device for a material. The bidirectional stretching device comprises a plasticizing device, a transition device, an opening die, a calendaring machine, a transverse stretching device, a longitudinal stretching device and a traction rolling device, all of which are sequentially connected in series, and therefore a system capable of conducting bidirectional stretching on plastic sheets and films is formed. The transverse stretching device comprises a tensioning wheel, a lifting machine, a streamline boss, a bow-shaped spreading roll and a tensioning wheel B. After the stretched material enters the transverse stretching machine, the material is tensioned through the tensioning wheel A and the tensioning wheel B at the front end and the rear end. The stretched material is subjected to upward force exerted by the boss, the boss is fixed to the lifting table, when the lifting table ascends, the height difference between the boss and an inlet of the stretched material becomes larger, the contact area and the acting force between the boss and the stretched material are increased, and the transverse stretching rate of the stretched material becomes larger. A differential stretching manner is adopted in a longitudinal stretching machine, the longitudinal stretching machine is composed of a set of rollers different in rotating speed, and longitudinal stretching is achieved through the rotating speed difference between each front roller and the corresponding rear roller.

Description

technical field [0001] The invention relates to the technical field of stretching, especially the stretching technology of plastic materials. Background technique [0002] The planar stretching method is to make the melt or solution of the high molecular polymer through a long and narrow machine head to make a sheet or film, and then in a special stretching machine, at a certain temperature and a set speed, at the same time or It is stretched in two vertical directions, and it is made by proper cooling and heat treatment or special processing. [0003] In the production process of biaxial stretching, the stretching of the polymer in the horizontal and vertical directions changes the arrangement of the polymer molecules and segments, so that it has a high degree of plane orientation, and the crystallinity is improved. The aggregated structure changes the properties of the material. [0004] At present, most of them use uniaxial stretching, and the mechanical structure of tr...

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Problems solved by technology

[0004] At present, most of them use uniaxial stretching. The mechanical structure of transverse stretching in biaxial stretching equipment is often more complicated, the cost is higher, the stretching efficiency is low, and the stretching uniformity needs to be improved.

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