CN101672943B

CN101672943B - Production method of a broad PVA polarized light film

Info

Publication number: CN101672943B
Application number: CN2009101527552A
Authority: CN
Inventors: 梁多平; 项秀阳; 董淑英; 周盛华; 胡更生; 赵松章; 徐德英
Original assignee: Hangzhou Electronic Science and Technology University
Current assignee: Haian Service Center for Transformation of Scientific Achievements
Priority date: 2009-09-28
Filing date: 2009-09-28
Publication date: 2011-03-30
Anticipated expiration: 2029-09-28
Also published as: CN101672943A

Abstract

The invention relates to a production method of a broad PVA polarized light film. The broad PVA polarized light film can not be produced in the prior art. The broad PVA polarized light film production method comprises the following steps: firstly soaking a PVA film into saturated solution of KI and KI2 with the weight ratio of 2-8:1 at the normal temperature; then heating two sides of the PVA film twice; putting the PVA film into a boric acid saturated solution with the temperature of 55-65 DEG C, and stretching the PVA film by 1-9 times in the boric acid saturated solution; respectively and thermally setting both sides of the PVA film through two heat setting rollers at the heat setting temperature of 65-75 DEG C; and drawing the thermal set PVA film and winding into a drum. The method has the advantages of simple process, accurate heating temperature, easy control of film thickness and low rejection rate, and realizes the industrialization production of the broad PVA polarized light films.

Description

A kind of production method of broad PVA polarized light film

Technical field

The invention belongs to the membrane technology field, be specifically related to a kind of production method of broad PVA polarized light film.

Background technology

At present, produce the longitudinal stretching process units of PVA polarization film and technology on the market seldom.Existing processes and equipment generally are applicable to the production of PVA polarization film in a narrow margin, and the production equipment of broad PVA polarized light film and technology are still blank.Along with applying of large-scale LCDs (more than 50 cun), the needs to broad PVA polarized light film on the market are more and more urgent.

Summary of the invention

Purpose of the present invention just provides a kind of production method of broad PVA polarized light film, and this method adopts the longitudinal stretching equipment that has dipping tank device and oily medium warm-up mill to generate.

The concrete scheme of the inventive method is:

At first with KI and the I of PVA film at normal temperature ₂Flooded KI and I in the saturated solution in the saturated solution 20～60 seconds ₂Weight ratio be 2～8: 1.I ₂Just be adsorbed on the strand of PVA film fully with KI.

To adsorb I ₂Carry out the heating first time by the one-level hot-rolling respectively with the two sides of the PVA film of KI, heating-up temperature is 45～55 ℃ for the first time, by the secondary hot-rolling heating is second time carried out on the two sides of PVA film respectively again, and the second time, heating-up temperature was 55～65 ℃.Described one-level hot-rolling is identical with the structure of secondary hot-rolling, include oily medium warm-up mill and silicon rubber hold-down roller, the surface of silicon rubber hold-down roller is heat-resisting silastic-layer, silicon rubber hold-down roller two ends connect the Pneumatic pressure regulating device, oil medium warm-up mill is a steel rider, interior the opening near surface location of steel rider used the oil pipe road, the hot oiling machine is communicated with, is communicated with oil pipe road in oily another side of medium warm-up mill by return line by the oil pipe road in side of in-line and oily medium warm-up mill, and in-line is provided with circular-pump.

Sending into temperature through the PVA film after twice heating by deflector roll is that the PVA film stretches in the boric acid saturated solution 1～9 times in 55～65 ℃ the boric acid saturated solution; Described stretching is to realize by the rotating ratio between two pairs of draw rolls, and draw roll adopts steel rider, and the surface is heat-resisting silastic-layer, and type of heating adopts oily medium heating, and heating-up temperature is 55～65 ℃.

The PVA film carries out thermal finalization to the two sides of PVA film by after coming out in the boric acid saturated solution respectively by two setting rollers, and setting roller adopts steel rider, and type of heating adopts oily medium heating, and heat setting temperature is 65～75 ℃.PVA film after the thermal finalization is curled into tube through traction.

The inventive method technology is simple, particularly adopt the warm-up mill, setting roller, the tensile silicon rubber rollers that have dipping tank device and the heating of oily medium, heating-up temperature is (positive and negative about 0.5 ℃) very accurately, the thickness of film is easy to control, easy suitability for industrialized production, produced at the bottom of the rejection rate, PVA polarized light film that can the production wide cut is for the LCD of producing large-scale wide cut creates conditions.

Description of drawings

Fig. 1 adopts the structural representation of equipment for the inventive method;

Fig. 2 is oily medium heating synoptic diagram.

Embodiment

As shown in Figure 1, the production equipment of PVA polarization film comprises unwinding device 1, one-level solution tank 3, one-level hot-rolling, secondary hot-rolling, secondary solution tank 11, setting roller, draw-gear 16 and the crimping device 17 that is provided with in order.

Unwinding device 1 is arranged on a side of one-level solution tank 3.Under the normal temperature, KI and I are housed in the one-level solution tank 3 ₂Saturated solution, KI and I ₂Weight ratio be 2～8: 1.One-level solution tank 3 is communicated with one-level fluid infusion groove 2, one-level fluid infusion groove 2 be used to regulate and additional one-level solution tank 3 in KI and I ₂Saturated solution.Temperature is housed is 55～65 ℃ boric acid saturated solution in the secondary solution tank 11, secondary solution tank 11 is communicated with secondary fluid infusion groove 10, secondary fluid infusion groove 10 be used to regulate and additional secondary solution tank 11 in the boric acid saturated solution.

One-level location deflector roll 4-1 and secondary location deflector roll 4-2 are arranged in the one-level solution tank 3, are immersed in KI and I ₂In the saturated solution, and be on the same surface level.The rotating speed of two location deflector rolls is the same, and generally about 1.5m/min, the center distance of two location deflector rolls guarantees that the PVA film is at KI and I between 500～1500mm ₂Flooded in the saturated solution 20～60 seconds.

One-level hot-rolling, secondary hot-rolling and one-level rotaring forward roller 9 are arranged between one-level solution tank 3 and the secondary solution tank 11 in order.The one-level hot-rolling comprises two hot-rollings, the heating first time is carried out on the two sides of PVA film respectively, each hot-rolling includes oily medium warm-up mill 5-1 and 5-2 and silicon rubber hold-down roller 6-1 and 6-2, the surface of silicon rubber hold-down roller is heat-resisting silastic-layer, silicon rubber hold-down roller two ends connect the Pneumatic pressure regulating device, oil medium warm-up mill is a steel rider, and type of heating adopts oily medium heating, and heating-up temperature is 45～55 ℃.The secondary hot-rolling also comprises two hot-rollings, the heating second time is carried out on the two sides of PVA film respectively, each hot-rolling includes oily medium warm-up mill 8-1 and 8-2 and silicon rubber hold-down roller 7-1 and 7-2, the surface of silicon rubber hold-down roller is heat-resisting silastic-layer, silicon rubber hold-down roller two ends connect the Pneumatic pressure regulating device, oil medium warm-up mill is a steel rider, and type of heating adopts oily medium heating, and heating-up temperature is 55～65 ℃.

One-level draw roll 12-1 and secondary drawing roller 12-2 are arranged in the secondary solution tank 11, are immersed in the boric acid saturated solution, and are on the same surface level.One-level draw roll 12-1 and secondary drawing roller 12-2 are made of a pair of roller, this roller adopts steel rider, and the surface is heat-resisting silastic-layer, and type of heating adopts oily medium heating, heating-up temperature is 55～65 ℃, and secondary drawing roller 12-2 rotating speed is 1～9 times of one-level draw roll 12-1 rotating speed.

Setting roller comprises two hot-rollings, and thermal finalization is carried out on the two sides of PVA film, and each hot-rolling includes warm-up mill 15-1 and 15-2 and hold-down roller 14-1 and 14-2.The surface of hold-down roller is heat-resisting silastic-layer, and the hold-down roller two ends connect the Pneumatic pressure regulating device.Warm-up mill is a steel rider, and type of heating adopts oily medium heating, and heat setting temperature is 65～75 ℃.Secondary rotaring forward roller 13 is arranged on position between setting roller and the secondary solution tank 11.

As shown in Figure 2, the oily medium warm-up mill 5-1 and the 5-2 of one-level hot-rolling, the oily medium warm-up mill 8-1 and the 8-2 of secondary hot-rolling, the steel rider of the steel rider of one-level draw roll 12-1 and secondary drawing roller 12-2, and two warm-up mill 15-1 of setting roller and 15-2 all adopt the mode of oily medium heating, concrete structure is: open with oil pipe road 22 near surface location in the roller, hot oiling machine 20 is communicated with by the interior oil pipe road 22 of an in-line 19 and a side of roller, be communicated with by the oil pipe road 22 in another side of return line 21 and roller, 19 are provided with circular-pump 18 on the in-line.

Utilize the concrete grammar of this device fabrication PVA polarization film to be: at first with KI and the I of PVA film at normal temperature ₂Flooded KI and I in the saturated solution in the saturated solution 20～60 seconds ₂Weight ratio be 2～8: 1.I ₂Just be adsorbed on the strand of PVA film fully with KI.

To adsorb I ₂Carry out the heating first time by the one-level hot-rolling respectively with the two sides of the PVA film of KI, heating-up temperature is 45～55 ℃ for the first time, by the secondary hot-rolling heating is second time carried out on the two sides of PVA film respectively again, and the second time, heating-up temperature was 55～65 ℃.

Sending into temperature through the PVA film after twice heating by deflector roll is that the PVA film stretches in the boric acid saturated solution 1～9 times in 55～65 ℃ the boric acid saturated solution.Thermal treatment can improve polarizing coating in the process that stretches wet-hot aging performance and thermal finalization, draw roll, BAS, PVA film keep stationary temperature during stretching.Can the rotating speed of the temperature of drawing machine, the front and back roller that stretches all directly has influence on stretching the PVA strand, forms grating, and the polarized light effect is arranged.

The PVA film carries out thermal finalization to the two sides of PVA film by after coming out in the boric acid saturated solution respectively by two setting rollers, and heat setting temperature is 65～75 ℃.Through thermal finalization, fixedly macromolecular chain is avoided resilience, influences the polarization photosensitiveness and the grating of PVA film.

PVA film after the thermal finalization becomes finished product PVA polarization film through drawing, being curled into tube.The PVA polarization film produced is shaped through draw-gear and crimping device, and the fine setting haulage speed is controlled the wall thickness of PVA polarization film.Crimping device is controlled by frequency-changing control system, keeps being complementary with haulage speed by adjusting motor speed.Regulate the tension force that curls with jockey pulley, make the inside and outside tensile force unanimity of every volume PVA polarization film.

Claims

1. the production method of a broad PVA polarized light film is characterized in that this method specifically:

At first with KI and the I of PVA film at normal temperature ₂Flooded in the saturated solution 20～60 seconds, and made I ₂Be adsorbed on the strand of PVA film KI and I in the saturated solution fully with KI ₂Weight ratio be 2～8: 1;

To adsorb I ₂Carry out the heating first time by the one-level hot-rolling respectively with the two sides of the PVA film of KI, heating-up temperature is 45～55 ℃ for the first time, by the secondary hot-rolling heating is second time carried out on the two sides of PVA film respectively again, and the second time, heating-up temperature was 55～65 ℃; Described one-level hot-rolling is identical with the structure of secondary hot-rolling, include oily medium warm-up mill and silicon rubber hold-down roller, the surface of silicon rubber hold-down roller is heat-resisting silastic-layer, silicon rubber hold-down roller two ends connect the Pneumatic pressure regulating device, oil medium warm-up mill is a steel rider, and type of heating adopts oily medium heating;

Sending into temperature through the PVA film after twice heating by deflector roll is that the PVA film stretches in the boric acid saturated solution 1～9 times in 55～65 ℃ the boric acid saturated solution; Described stretching is to realize by the rotating ratio between two pairs of draw rolls, and draw roll adopts steel rider, and the surface is heat-resisting silastic-layer, and type of heating adopts oily medium heating, and heating-up temperature is 55～65 ℃;

The PVA film carries out thermal finalization to the two sides of PVA film by after coming out in the boric acid saturated solution respectively by two setting rollers, and setting roller adopts steel rider, and type of heating adopts oily medium heating, and heat setting temperature is 65～75 ℃;

PVA film after the thermal finalization becomes finished product PVA polarization film through drawing, being curled into tube.