CN110001039B

CN110001039B - Method for correcting warping of polarizing plate sheet

Info

Publication number: CN110001039B
Application number: CN201910364632.9A
Authority: CN
Inventors: 张宾; 廖志超; 侯廷基; 迟轶男
Original assignee: SHENZHEN SAPO PHOTOELECTRIC CO Ltd
Current assignee: SHENZHEN SAPO PHOTOELECTRIC CO Ltd
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2021-04-13
Anticipated expiration: 2039-04-30
Also published as: CN110001039A

Abstract

The invention provides a method for correcting the warping of a polarizing plate sheet, which comprises the steps of placing the polarizing plate sheet in a cylinder, and then placing the polarizing plate sheet in the cylinder under the conditions of proper environmental temperature and temperature for correcting for a certain time, so that a product with the warping of NG is corrected into a qualified product again. The invention overcomes the constraint of the site and equipment requirement condition in the prior art; the advantage in the aspect of cost is obvious, the finished product with NG warping is corrected in a targeted manner, and the waste of cost is reduced; the correcting tool is simple in structure, low in precision required by the environment and capable of realizing batch correction.

Description

Method for correcting warping of polarizing plate sheet

Technical Field

The invention relates to the field of post-processing of finished polarizing plates, in particular to a method for correcting the warping of a polarizing plate sheet.

Background

When the problem of warping is found during cutting of the polarizer of the coiled material, the warping is usually calibrated by reworking and replacing a protective film on the polarizer coiled material which is not processed into a sheet; the products which are cut into the warped NG sheets can only be completely scrapped; the rejected goods caused by warping NG or the warped NG products caused by long-term storage can only be completely discarded.

The above-mentioned processing method for warping a sheet has the following disadvantages:

(1) the inspection and reversal operation needs investment of equipment, materials and labor cost, and has certain loss;

(2) the polarizer re-attaching of the protective film (anti-inspection operation) cannot completely ensure the correction of the warpage, and has a certain failure probability;

(3) no correction method is provided for warping NG products at present, and the warping NG products are all scrapped and waste cost.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a method for correcting the warping of a polarizing plate sheet, which mainly aims at correcting the sheet which is warped due to NG under a specific environment, meets the customer specification and changes the scrapped products into good products.

The principle of warping is: the polarizing plate sheet has a multilayer structure, and each layer is bonded by glue. The film material is pulled up by large tension in the manufacturing process of the polarizing plate sheet, and the film material retracts after the tension disappears. The glue shrinks in the drying process, and the membrane material also shrinks in the drying process. Due to the two retraction processes, different film retraction levels can cause internal stress to develop between the layers of the polarizer sheet, which is OK if the internal stresses are balanced with each other and can cause warpage problems (positive and negative warpage NG) if the internal stresses are not balanced.

The principle of correction is as follows: the inwards warped side of the polarizing plate sheet is placed in a cylinder downwards, and unbalanced internal stress of the polarizing plate sheet is uniformly released within a certain time under certain environmental conditions, so that the warping of the polarizing plate sheet is corrected, and the specification of a customer is met.

The technical scheme of the invention is as follows:

a method for correcting the warping of a polarizing plate sheet comprises the following steps:

s1, putting the inward warped side of the polarizer sheet into a corresponding cylinder with the size of the polarizer sheet and the radius of the corresponding cylinder in a relationship of:

s2, the cylinder and the polarizer sheet are placed together in an environment with the temperature of 30-80 ℃ and the humidity of 20-90% for correcting time of 1-48 hr, and the warping of the product is corrected.

As a further improvement of the present invention, the higher the degree of warpage of the polarizing plate sheet and the larger the thickness, the higher the temperature of the environment for correction and the longer the correction time; the environment temperature is 40-60 ℃, and the correction time is 12-24 hr.

As a further improvement of the present invention, the higher the moisture content of the polarizing plate sheet, the higher the humidity of the selected environment; the water content of the polarizing sheet is below 0.1%, and the humidity of the environment is 20-50%; the water content of the polarizing sheet is 0.1% or more, and the humidity of the environment is 60-90%.

As a further improvement of the present invention, the method further includes S3, and the correction end point judgment: after the correction condition is selected, firstly, performing correction test on a small number of warped products, taking out and measuring whether the warped products meet the customer specification or not at regular time, if so, judging as a correction end point, recording the correction condition, and performing scale discharge correction; the ideal correction end point is that the four corners and the four sides warp to zero.

Compared with the prior art, the invention has the beneficial effects that:

(1) the new technology overcomes the requirements and conditions constraints of the field and the equipment in the prior art;

(2) the method has obvious advantages in cost, and the finished product with NG warping is corrected in a targeted manner, so that the waste of cost is reduced.

(3) The correcting tool is simple in structure, low in precision required by the environment and capable of realizing batch correction.

Drawings

FIG. 1 is a structural view of a polarizing plate sheet with NG warp according to the present invention.

FIG. 2 shows a polarizing plate sheet being corrected by the correction method of the present invention.

FIG. 3 is a polarizing plate sheet which has reached the end point of the correction by the correcting method of the present invention.

Detailed Description

In order to more clearly describe the embodiments of the present application or the technical solutions in the prior art, the present invention is further described below with reference to the accompanying drawings and specific embodiments.

Example 1

And (3) judging a correction end point: after the correction condition is selected, firstly, performing correction test on a small number of warped products, taking out and measuring whether the warped products meet the customer specification or not at regular time, if so, judging as a correction end point, recording the correction condition, and performing scale discharge correction; the ideal correction end point is that the four corners and the four sides warp to zero.

The polarizing plate sheet warped with NG was placed in a cylinder as shown in FIGS. 1 to 3, and the correction conditions and the correction results were as shown in Table 1 and Table 2, respectively.

TABLE 1 correction Condition List

Correction of condition

Temperature of

Humidity

Cylinder

Thickness of sheet

Sheet size

Correction time

Parameter(s)

40℃

40％

12 cun below the floor

306μm

19 cun in the front of the body

24hr

TABLE 2 correction result measuring table

The results of example 1 show that the rectification method of the invention overcomes the constraints of site and equipment requirements of the prior art; the advantage in the aspect of cost is obvious, the finished product with NG warping is corrected in a targeted manner, and the waste of cost is reduced; the correcting tool is simple in structure, low in precision required by the environment and capable of realizing batch correction.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A method for correcting the warping of a polarizing plate sheet, comprising the steps of:

polarizer sheet size (Length/inch) ＜5 5-15 15-32 32-50 ＞50 Cylinder size (radius/inch) 3 6 12 18 24

S2, placing the cylinder and the polarizing plate together in an environment with the temperature of 30-80 ℃ and the humidity of 20-90%, and correcting for 1-48 hours to correct the warpage of the product;

wherein the content of the first and second substances,

the higher the degree of warping of the polarizing plate sheet and the larger the thickness, the higher the temperature of the environment for correction and the longer the correction time; the environment temperature is 40-60 ℃, and the correction time is 12-24 hr;

the higher the water content of the polarizing plate sheet, the higher the humidity of the selected environment; the water content of the polarizing sheet is below 0.1%, and the humidity of the environment is 20-50%; the water content of the polarizing sheet is 0.1% or more, and the humidity of the environment is 60-90%;

and S3, judging the correction end point: after the correction condition is selected, firstly, performing correction test on a small number of warped products, taking out and measuring whether the warped products meet the customer specification or not at regular time, if so, judging as a correction end point, recording the correction condition, and performing scale discharge correction; the ideal correction end point is that the four corners and the four sides warp to zero.