Gear transmission type film synchronous two-way stretching device and matched technological method thereof

Abstract

The invention provides a gear transmission type film synchronous two-way stretching device and a matched technological method thereof. The device comprises a differential meshing gear mechanism, a meshing clamping force adjusting assembly, a main body base and a transmission motor, wherein a plurality of clamping gear sets in the differential meshing gear mechanism are arranged in a bilateral symmetry mode and are arranged in a splayed shape, in the film clamping and transmission process, the distance between the clamping gear sets on the two sides is gradually increased, and the transverse stretching effect on a film is achieved; and adjacent clamping gear sets on each side are driven by different motors or different transmissions, the rotating speed ratio of two adjacent clamping gear sets on each side is 1.1-1.5, and the longitudinal stretching effect on the film is generated through gear differential. According to the processing device, in the film conveying process, through the differential meshing gear mechanism, the stretching clamping site changes along with the clamping gear sets, so that stepless synchronous two-way stretching is achieved, and the device is suitable for conducting synchronous two-way stretching processing on the film.

Description

technical field [0001] The invention belongs to the technical field of film stretching processing, and in particular relates to a gear-driven film synchronous bidirectional stretching device and a matching process method thereof. Background technique [0002] Plastic films are widely used in food packaging, electrical product packaging, daily necessities packaging, clothing packaging and other packaging fields. In addition, with the rapid development of functional films, the market has higher and higher requirements for the performance of films. As a kind of polymer material, plastic film will change its microstructure after biaxial stretching processing in a certain temperature state. Compared with unstretched film, biaxial stretching film has higher tensile strength and modulus. , better air tightness, better dimensional stability and better optical properties, etc. Therefore, the development potential of biaxially stretched film is great, and the market prospect is broad...

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Problems solved by technology

[0006] However, the above-mentioned disclosed equipment essentially realizes asynchronous biaxial stretching, and the stretching process is carried out separately from longitudinal stretching and transverse stretching. The production and processing of special films, such as thermoplastic polyvinyl alcohol, are more suitable for simultaneous biaxial stretching

In addition, when it is used for film stretching, especially when it is applied to high-magnification stretching of the film, the clamping force of the film mainly depends on the pressure provided by the binding rope and the stretching wheel, so the bidirectional stretching force of the film is equivalent to The friction of the contact surface, the friction coefficient of the contact surface of the binding rope is relatively limited, and the tension force of the rope itself is also limited, which will inevitably lead to limited bidirectional stretching force of the film, and it is difficult to achieve transverse stretching for wide-width films and high-strength films. In addition, the transverse stretching of the device only occurs on the semicircle of transverse stretching, so its maximum transverse stretching ratio depends on the radius of the transverse stretching wheel, which is affected by its transverse stretching. Structural size limitation of extension wheel

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