Bidirectional synchronous drawing equipment for plastic film

Abstract

The invention discloses bidirectional synchronous drawing equipment for a plastic film, which comprises two annular rails and two transmission chain clamps, wherein each annular rail comprises a preheating section, a drawing section, a molding section and a return section; and the distance between the two annular rails is gradually increased from front to back. The equipment is characterized in that: each annular rail is provided with an inner rail and an outer rail; in the drawing section of the annular rail, the distance between the inner rail and the outer rail is gradually decreased from front to back; the transmission chain clamps comprises a plurality of connecting rods, a plurality of clamps and a plurality of driving blocks; the clamps are arranged on the outer rails through rollers and provided with first rotating shafts; the driving blocks are arranged on the inner rails through rollers and provided with second rotating shafts; one end of each connecting rod is rotatably connected with each first rotating shaft, while the other end is rotatably connected with each second rotating shaft; and each four adjacent connecting rods form an M-shaped structure. The bidirectional synchronous drawing equipment can synchronously draw the plastic film in the longitudinal and horizontal directions, and is simple in structure, reliable in operation and low in energy consumption; and the produced plastic film has good properties.

Description

technical field [0001] The invention relates to plastic stretching and forming equipment, in particular to bidirectional synchronous stretching equipment for plastic films. Background technique [0002] Biaxial stretching is a relatively advanced plastic film production process. The plastic film obtained by biaxial stretching has smaller thickness and better performance. In particular, with the development of the economy, more and more fields require high-strength, high-insulation optical-grade plastic films (thickness is usually 10-300 μm) or ultra-thin plastic films (thickness is usually less than 1 μm), and These plastic films can generally only be produced by biaxial stretching. [0003] To produce plastic film by biaxial stretching process, usually the thicker plastic film is preheated first, then stretched in both longitudinal and transverse directions, and then shaped to obtain a thinner plastic film. Most of the existing biaxial stretching processes are bidirection...

AI Technical Summary

Problems solved by technology

The disadvantages of bidirectional asynchronous stretching are: (1) The plastic film needs to be preheated before longitudinal stretching, and the plastic film needs to be cooled and shaped after longitudinal stretching. Similarly, the plastic film needs to be preheated before transverse stretching to complete transverse stretching. After stretching, the plastic film needs to be cooled and shaped, and longitudinal stretching and transverse stretching each require a driving device, so the equipment structure is complicated, the cost is high, and the energy consumption is high; (2) The performance of the produced plastic film is still not ideal

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