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Processing device for biaxially stretched polyvinyl alcohol film and matching method thereof

A polyvinyl alcohol film and biaxial stretching technology, which is applied in the preparation of polyvinyl alcohol film and the processing device field of biaxially stretched polyvinyl alcohol film, can solve the problem of easy slippage, high melt strength, and difficulty in stretching PVA film. problems such as magnification processing, to achieve the effect of reducing the process of quenching and secondary heating, the supporting process is simple, and the value of industrial production is good

Active Publication Date: 2021-05-14
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The PVA modified by this method has processability, wide processing window, high melt strength, and good film-forming property, but it is also accompanied by the problem of volatilization and dissipation of plasticizer modifiers.
[0009] Therefore, when the above-mentioned equipment stretches the polyvinyl alcohol film, modifiers such as glycerin and water will precipitate out, and the crawler-type structure of the equipment is prone to slipping under the premise of insufficient clamping force, which further affects High magnification stretching of polyvinyl alcohol film
[0010] With the rapid development of the PVA film industry, the demand for the stretching ratio in the processing process has increased accordingly. The structure of the biaxial stretching equipment in the prior art is quite complicated, and the design of PVA as a processing raw material has not been considered. Special properties, difficult to apply to PVA film high stretch ratio processing

Method used

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  • Processing device for biaxially stretched polyvinyl alcohol film and matching method thereof
  • Processing device for biaxially stretched polyvinyl alcohol film and matching method thereof
  • Processing device for biaxially stretched polyvinyl alcohol film and matching method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] This example is a specific implementation method for preparing a biaxially stretched polyvinyl alcohol film with a transverse stretch ratio of 4.5 and a longitudinal stretch ratio of 3.5, wherein the raw materials of the polyvinyl alcohol film are self-made:

[0066] Such as figure 1 , figure 2 As shown, a processing device for biaxially stretching polyvinyl alcohol film includes two sets of meshing crawler mechanisms 1, heating rollers 2, meshing clamping force adjustment components, opening angle adjustment components, main body base 3 and transmission motor 18,

[0067] Each group of said engaging crawler mechanism 1 includes two clamping tracks (4-1, 4-2) that are engaged with each other. The clamping track is driven by the crawler drive roller 5 and is provided with an engaging structure on the surface, and the two clamping tracks (4-1, 4-2) rotate in opposite directions at the same speed, clamp and drive the film to be processed by the contact surface at the mes...

Embodiment 2

[0093] This example is a specific implementation method for preparing a biaxially stretched polyvinyl alcohol film with a transverse stretch ratio of 3.0 and a longitudinal stretch ratio of 2.5, wherein the raw materials of the polyvinyl alcohol film are self-made:

[0094] A processing device for biaxially stretched polyvinyl alcohol film, including two sets of meshing crawler mechanisms, heating roller sets, meshing clamping force adjustment components, opening angle adjustment components, a main body base and a transmission motor,

[0095] Each set of meshing crawler mechanisms includes two gripping crawlers that mesh with each other. The gripping crawler is driven by the crawler drive roller and has an engaging structure on the surface, and the two gripping crawlers rotate in opposite directions at the same speed. The film to be processed is clamped and driven by the contact surface. The length of the contact surface engaged with each other is 100 cm, and the width is 5 cm....

Embodiment 3

[0117] This example is a specific implementation of preparing a biaxially oriented polypropylene film with a transverse stretch ratio of 2.0 and a longitudinal stretch ratio of 1.5, wherein the raw material used is polypropylene T30s (Maoming Petrochemical).

[0118] A processing device for biaxially stretching polyvinyl alcohol film, including two sets of meshing crawler mechanisms, heating roller sets, meshing clamping force adjustment components, a main body base and a transmission motor,

[0119] Each set of meshing track mechanism includes two clamping tracks that are engaged with each other. The clamping track is driven by the track drive roller and has an engaging structure on the surface, and the two clamping tracks rotate in opposite directions at the same speed. The film to be processed is clamped and driven by the contact surface. The length of the contact surface engaged with each other is 50cm, and the width is 2cm. The clamping track is fixed by the side support p...

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Abstract

The invention provides a processing device for a biaxially stretched polyvinyl alcohol film and a matching method thereof. The processing device comprises two meshing crawler belt mechanisms, a heating roller set, a meshing clamping force adjusting assembly, a main body base and a transmission motor, wherein the two meshing crawler belt mechanisms are arranged in a splayed shape, in the thin film clamping and transmission process, the distance between the two meshing crawler belt mechanisms is gradually increased to generate a transverse stretching effect on the film, the rotating linear speed v1 of a driving roller in the heating roller set driven by the transmission motor is smaller than the rotating linear speed v2 of crawler belt transmission rollers of the two meshing crawler belt mechanisms, and the longitudinal stretching effect is generated on the film through the film conveying speed difference between the heating roller set and the meshing crawler belt mechanisms. According to the processing device, double clamping and fixing of the film are achieved through the meshing crawler belt mechanisms and the meshing clamping force adjusting assembly, and therefore the processing device is suitable for conducting high-magnification stretching on the film.

Description

technical field [0001] The invention belongs to the technical field of biaxially stretched polyvinyl alcohol film processing, in particular to a biaxially stretched polyvinyl alcohol film processing device and its supporting method, especially for the degree of alcoholysis of 88 to 99 with a transverse stretching ratio of 4.5 times %, the preparation of polyvinyl alcohol film with a degree of polymerization of 1700-2400. Background technique [0002] In people's production and life, plastic film materials are widely used due to their low cost, high performance, and wide applicability, especially in packaging, shopping bags and other fields. In the packaging industry, traditional plastic film materials include polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC) and polyester (PET), etc. In 2013, the total domestic output of packaging film was 10.893 million tons, and the growth rate remained Around 15.8%. [0003] PE, PP and other plastic film materials widely u...

Claims

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Application Information

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IPC IPC(8): B29C48/08B29C48/00B29C48/79B29C55/16B29L7/00
CPCB29C55/165B29L2007/00B29C48/0018B29C48/08B29C48/79
Inventor 王琪曾书龙李怡俊李莉
Owner SICHUAN UNIV
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