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A kind of winding method of PVA film for polarizer

A polarizer and film technology, which is applied in the field of PVA film winding for polarizers, can solve problems such as the accumulation of thickness differences, the aggravation of film lateral thickness, and product quality problems, so as to reduce the accumulation of thickness differences, avoid repeated stacking, and eliminate The effect of adverse defects

Active Publication Date: 2021-03-23
重庆光谱新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, as the width of the PVA film increases and the thickness becomes thinner, many problems will appear in the winding process: on the one hand, it is difficult to ensure the absolute uniformity of the thickness of the PVA film during the coating process (at present, most of the product thickness differences are controlled at ±1μm), especially the lateral thickness of the film. During the winding process, the difference in the lateral thickness of the film will increase with the increase in the number of film coating layers, resulting in the accumulation of thickness differences, and the final gradually enlarged thickness difference is very easy. Lead to defects such as stripes, strands, and wrinkles in film winding, resulting in product quality problems
On the other hand, because PVA film is flexible and easy to stick to each other, it is easy to produce wrinkles in conventional winding

Method used

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  • A kind of winding method of PVA film for polarizer
  • A kind of winding method of PVA film for polarizer
  • A kind of winding method of PVA film for polarizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Through the PVA film production line, a PVA film with a width of 2800 mm, a thickness of 75 μm, and a film thickness uniformity of ±1 μm is prepared; after the above-mentioned PVA film is passed through a winding roller with a diameter of 250 mm, it is wound by a winding mechanism; During the rewinding process, control the rewinding mechanism to move laterally within 5mm (left and right offset from the center position), and the lateral movement rate is 10mm / min to ensure the stability of rewinding; at the same time, the rewinding speed is 5m / min, The roll tension is 14N·m, and the winding mechanism moves backward with the film roll, so that the distance between the surface of the film on the winding roll and the surface of the winding pressure roll is always kept at 5mm; the total length of the film winding is 20000m, and the PVA film is completed Winding.

[0041] During the entire winding process, the surface of the PVA film is smooth, without defects such as wrinkles...

Embodiment 2

[0043] Through the PVA film production line, a PVA film with a width of 800 mm, a thickness of 20 μm, and a film thickness uniformity of ±1 μm is prepared; after the above-mentioned PVA film is passed through a winding roller with a diameter of 50 mm, it is wound by a winding mechanism; During the rewinding process, control the rewinding mechanism to move laterally within 5mm (left and right offset from the center position), and the lateral movement rate is 0.1mm / min to ensure the stability of rewinding; at the same time, the rewinding speed is 2m / min, The winding tension is 50N m, and the winding mechanism moves backward with the film roll, so that the distance between the surface of the film on the winding roller and the surface of the winding pressure roller is always kept at 50mm; the total length of the film winding is 20000m, and the PVA film is completed of rewinding.

[0044] During the entire winding process, the surface of the PVA film is smooth, without defects such...

Embodiment 3

[0046] Through the PVA film production line, a PVA film with a width of 5000 mm, a thickness of 100 μm, and a uniformity of film thickness of ± 2 μm is prepared; after the above-mentioned PVA film is passed through a winding pressure roller with a diameter of 500 mm, it is wound by a winding mechanism; During the rewinding process, control the rewinding mechanism to move laterally within 10mm (left and right offset from the center position), and the lateral movement rate is 20mm / min to ensure the stability of rewinding; at the same time, the rewinding speed is 10m / min, The winding tension is 1N m, and the winding mechanism moves backward with the film roll, so that the distance between the surface of the film on the winding roller and the surface of the winding pressure roller is always kept at 1mm; the total length of the film winding is 20000m, and the PVA film is completed. Winding.

[0047] During the entire winding process, the surface of the PVA film is smooth, without d...

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Abstract

The invention provides a winding method of a PVA membrane for a polarizer. The method comprises the steps that after to-be-wound PVA membranes pass through a winding pressing roller, the to-be-wound PVA membranes are wound, in the winding process, the winding mechanism is controlled to move left and right towards the center in the horizontal direction, the winding mechanism is controlled to move towards the winding direction with the increasing of the membrane winding thickness, and the distance between the surface of the upper membrane of the winding mechanism and the surface of the winding pressing roller remains unchanged. By means of the method, the forming of repeated stacking of the PVA membranes on a membrane position point caused by thickness difference is effectively prevented bycontrolling the winding mechanism to perform transverse moving, so that the accumulation with thickness difference is reduced to an extent, the winding mechanism is controlled to move in the winding direction integrally, the membranes on the winding roller mechanism are ensured to be always in a relatively stable position with the winding pressing roller, and stable winding of the membranes is achieved. Experimental results show that in the whole winding process of the method, the surfaces of the PVA membrane are flat and have no defected problems of folding wrinkles, stripes, folding lines and the like.

Description

technical field [0001] The invention relates to the technical field of PVA films, and more specifically, relates to a winding method of PVA films for polarizers. Background technique [0002] Polarizer is an important part of liquid crystal display (LCD), mainly used to control the optical rotation of light passing through liquid crystal. A polarizer is generally made of a polarizing film formed by directionally adsorbing iodine of a dichroic pigment or a dichroic dye to a polyvinyl alcohol-based resin film. With the increase in width and thickness of LCD products, polarizers are also developing in the direction of larger size and thinner thickness. [0003] However, as the width of the PVA film increases and the thickness becomes thinner, many problems will appear in the winding process: on the one hand, it is difficult to ensure the absolute uniformity of the thickness of the PVA film during the coating process (at present, most of the product thickness differences are co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B65H18/08
CPCB65H18/08
Inventor 李承龙吕新坤谭海军黎雪峰陈玉仙古文正胡明源
Owner 重庆光谱新材料科技有限公司