CN216708341U

CN216708341U - Stretching device for polarizing film

Info

Publication number: CN216708341U
Application number: CN202123451670.XU
Authority: CN
Inventors: 翁璞
Original assignee: Wenzhou Bochengda Optical Co ltd
Current assignee: Wenzhou Bochengda Optical Co ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-06-10
Anticipated expiration: 2031-12-31

Abstract

The utility model provides a stretching device of a polarizing film, which comprises a dyeing stretching mechanism, an unreeling mechanism and a drying mechanism, wherein the unreeling mechanism and the drying mechanism are respectively arranged on the dyeing stretching mechanism; the polaroid has uniform tone, and can be dried uniformly to improve the utilization rate of heat energy.

Description

Stretching device of polarizing film

Technical Field

The utility model mainly relates to the technical field of polarizing film production, in particular to a stretching device for a polarizing film.

Background

The polarizing layer is made of a PVA (polyvinyl alcohol) film which is dyed and stretched, and is a main part of the polarizer, also called a polarizing original film. The polarizing layer determines the polarizing performance and transmittance of the polarizer and is also a main part influencing the color tone and optical durability of the polarizer. The basic processing technology of the polarizing layer can be divided into two series of dye system and iodine system according to the dyeing method, and can be divided into two series of dry stretching and wet stretching according to the stretching technology, and the adjustment of the polarizing degree, the transmittance, the color tone and the optical durability can be realized by changing the material and the processing technology of the polarizing layer. On the basis of realizing PVA blow molding film forming, the film performance can be further improved by adopting a stretching method.

In the conventional polarizing film stretching technique, a polyvinyl alcohol film (PVA film) as a raw material film is generally subjected to swelling treatment, dyeing treatment, crosslinking treatment, stretching treatment, and the like in a bath by a dyeing wet stretching method. However, the polarizer is produced by a drying process immediately after the stretching process, and the degree of uniformity of color tone of the polarizer is often affected depending on the bath in which the PVA film is treated and the degree of drying of the PVA film.

SUMMERY OF THE UTILITY MODEL

The present invention mainly provides a stretching device for a polarizing film, which is used for solving the technical problems in the background art.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

the utility model provides a polarizing film's stretching device, wherein, including dyeing tension mechanism, locate dyeing tension mechanism's unwinding mechanism and stoving mechanism respectively, dyeing tension mechanism is including the dyeing treatment tank, cross-linking treatment tank, tensile treatment tank and the adjustment treatment tank that set gradually, and the both sides of each treatment tank all are equipped with the drive roller, each be equipped with a plurality of guide rolls that are used for conveying the raw materials membrane on the unwinding mechanism respectively between the drive roller, and the raw materials membrane is behind each treatment tank, can convey in the stoving mechanism, stoving mechanism includes the stoving case and locates the drying cycle subassembly of stoving incasement, the drying cycle subassembly is used for recycling the steam of stoving incasement, dries the raw materials membrane.

Further, dry circulation subassembly is including locating the air-out cover at stoving roof portion and the circulation cover of locating stoving bottom of the case portion, the top of air-out cover is equipped with electrothermal tube and induced-draft fan, induced-draft fan installs the air intake department on air-out cover top, induced-draft fan and air-out between the cover are arranged in to the electrothermal tube, the export of air-out cover corresponds with the export of circulation cover, the bottom of circulation cover is equipped with circulation channel, circulation channel's both ends import department up, and arrange the both sides of raw materials membrane in for receive out air-out cover spun steam, circulation cover's import and circulation channel's middle part intercommunication, and circulation cover's import department installs circulation fan.

Furthermore, open the both sides of going out the fan housing and have logical groove, just it installs the fan to lead to the groove, the import and the play fan housing intercommunication of fan, export and circulation channel correspond.

Furthermore, a swelling treatment tank is arranged at the upstream of the dyeing treatment tank.

Further, the driving rollers on two sides of the stretching treatment tank adjust the rotating speed through a controller, and the driving rollers are used for stretching the raw material film.

Furthermore, exhaust passages are arranged on two sides of the air outlet cover, and the exhaust passages are arranged at the top end of the drying box.

Furthermore, the top openings of the exhaust channel and the air outlet cover are provided with dust screens.

Compared with the prior art, the utility model has the beneficial effects that:

1. when a polyvinyl alcohol film serving as a raw material film is treated, a swelling treatment tank is used for swelling the polyvinyl alcohol film, the polyvinyl alcohol film is dyed by iodine in the dyeing treatment tank, the polyvinyl alcohol film is crosslinked by boric acid aqueous solution in a crosslinking treatment tank, a stretching treatment tank is stretched by heated boric acid aqueous solution, the stretching ratio can be automatically adjusted, and the polyvinyl alcohol film is adjusted by potassium iodide aqueous solution in the adjustment treatment tank; and the obtained polaroid has uniform color tone, and the color tone can be automatically adjusted.

2. After dyeing the drawing mechanism and handling the polyvinyl alcohol membrane as the raw materials membrane, drying mechanism carries out the drying to the polyvinyl alcohol membrane through the hot-blast of air-out cover spun, and the circulation is through being used for receiving air-out cover spun hot-blast, and the hot-blast blowout of receiving is spun with the circulating fan in the rethread circulation cover, dries the another side of polyvinyl alcohol membrane, and fan and circulation channel cooperation, circulate air-out cover spun hot-blast to reach the purpose that improves the utilization ratio of heat energy.

The present invention will be explained in detail below with reference to the drawings and specific embodiments.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a schematic structural diagram of the drying mechanism of the present invention.

In the figure: 1. a dyeing and stretching mechanism; 2. an unwinding mechanism; 3. a drying mechanism; 4. a drying cycle assembly; 11. a dyeing treatment tank; 12. a crosslinking treatment tank; 13. a stretching treatment tank; 14. adjusting the treatment tank; 15. a drive roller; 16. a guide roller; 17. a swelling treatment tank; 31. a drying box; 41. an air outlet cover; 42. a circulation cover; 43. an air draft fan; 44. an electric heating tube; 45. a circulation channel; 46. a circulating fan; 47. a through groove; 48. a fan; 49. an exhaust passage.

Detailed Description

In order to facilitate an understanding of the utility model, the utility model will now be described more fully hereinafter with reference to the accompanying drawings, in which several embodiments of the utility model are shown, but which may be embodied in different forms and not limited to the embodiments described herein, but which are provided so as to provide a more thorough and complete disclosure of the utility model.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may be present, and when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present, as the terms "vertical", "horizontal", "left", "right" and the like are used herein for descriptive purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the knowledge of the terms used herein in the specification of the present invention is for the purpose of describing particular embodiments and is not intended to limit the present invention, and the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

The utility model provides a polarizing film stretching device, as shown in fig. 1-2, which comprises a dyeing stretching mechanism 1, an unwinding mechanism 2 and a drying mechanism 3, wherein the unwinding mechanism 2 and the drying mechanism 3 are respectively arranged on the dyeing stretching mechanism 1, the dyeing stretching mechanism 1 comprises a dyeing treatment tank 11, a crosslinking treatment tank 12, a stretching treatment tank 13 and an adjusting treatment tank 14 which are sequentially arranged, driving rollers 15 are respectively arranged on two sides of each treatment tank, a plurality of guide rollers 16 for conveying a raw material film on the unwinding mechanism 2 are respectively arranged between the driving rollers 15, the raw material film can be conveyed into the drying mechanism 3 after passing through each treatment tank, the drying mechanism 3 comprises a drying box 31 and a drying circulation component 4 arranged in the drying box 31, and the drying circulation component 4 is used for circularly using hot air in the drying box 31 to dry the raw material film.

In the dyeing tank 11, a polyvinyl alcohol film (PVA film) as a raw material film is immersed in a dyeing solution, and iodine or a dichroic dye is adsorbed to the polyvinyl alcohol film to be dyed, and an iodine solution is generally used as the dyeing solution. In the crosslinking treatment tank 12, the dyed PVA film is immersed in an aqueous boric acid solution to be crosslinked.

The driving rollers 15 on the two sides of the stretching treatment tank 13 adjust the rotating speed through a controller and are used for stretching the raw material film; in the stretching treatment tank 13, the PVA film subjected to the above-described treatment is subjected to wet stretching treatment, and a heated boric acid aqueous solution is used as a treatment liquid for the wet stretching treatment, and the concentration and stretching ratio of the boric acid aqueous solution may be selected as needed.

In the adjustment treatment tank 14, the PVA film thus treated is immersed in an aqueous solution in which potassium iodide is dissolved, whereby the color tone of the PVA film can be adjusted. The polarizer is bluish due to the increase of I5-complex in the PVA film, reddish due to the increase of I3-complex in the PVA film with the increase of potassium iodide concentration, and the degree of orientation of iodine molecules can be adjusted by changing the concentration of the aqueous potassium iodide solution in the adjustment treatment tank 14, thereby finely adjusting the color tone of the PVA film. By adjusting the treatment bath, color unevenness of the polarizer can be uniformized.

Drying cycle subassembly 4 is including locating the play fan housing 41 at stoving case 31 top and locating the circulation cover 42 of stoving case 31 bottom, the top of going out fan housing 41 is equipped with electrothermal tube 44 and induced-draft fan 43, induced-draft fan 43 is installed in the air intake department on a play fan housing 41 top, induced-draft fan 43 and play wind housing 41 are arranged in to electrothermal tube 44, the export that goes out fan housing 41 corresponds with the export of circulation cover 42, the bottom of circulation cover 42 is equipped with circulation channel 45, circulation channel 45's both ends import department up, and place the both sides of raw materials membrane in for receive out fan housing 41 spun steam, circulation cover 42's import and circulation channel 45's middle part intercommunication, and circulation cover 42's import department installs circulating fan 46.

The hot air sprayed from the air outlet cover 41 dries the polyvinyl alcohol film, the hot air circularly passes through the air outlet cover 41 and is received, the received hot air is sprayed out by the circulating fan 46 in the circulating cover 42, and the other surface of the polyvinyl alcohol film is dried, so that the aim of uniform drying is fulfilled.

Through grooves 47 are formed in two sides of the air outlet cover 41, a fan 48 is mounted on each through groove 47, an inlet of the fan 48 is communicated with the air outlet cover 41, and an outlet of the fan 48 corresponds to the circulating channel 45; the fan 48 is matched with the circulating channel 45 to circulate the hot air sprayed out of the air outlet cover 41, so that the circulating drying effect is improved. The both sides of going out fan housing 41 are equipped with exhaust passage 49, just exhaust passage 49 locates the top of stoving case 31, exhaust passage 49 and the top opening of going out fan housing 41 all are equipped with the dust screen.

A swelling treatment tank 17 is further provided upstream of the dyeing treatment tank 11, and the PVA film is immersed in water to remove the anti-blocking powder adhering to the surface of the PVA film, thereby dissolving out the plasticizer in the PVA film and uniformly swelling the film; pure water is generally used as the swelling treatment liquid.

The specific implementation mode of the utility model is as follows:

1. when a polyvinyl alcohol film as a raw material film is treated, the swelling treatment tank 17 is used for swelling the polyvinyl alcohol film, the polyvinyl alcohol film is dyed by iodine in the dyeing treatment tank 11, the polyvinyl alcohol film is crosslinked by boric acid aqueous solution in the crosslinking treatment tank 12, the stretching treatment tank 13 is stretched by heated boric acid aqueous solution, the stretching ratio can be automatically adjusted, and the polyvinyl alcohol film is adjusted by potassium iodide aqueous solution in the adjustment treatment tank 14; and the obtained polaroid has uniform color tone, and the color tone can be automatically adjusted.

2. After dyeing the tensile mechanism 1 and handling the polyvinyl alcohol membrane as the raw materials membrane, drying mechanism 3 dries the polyvinyl alcohol membrane through the hot-blast wind that goes out the fan housing 41 spun, the circulation is through being used for receiving out fan housing 41 spun hot-blast, the hot-blast blowout of rethread circulation cover 42 internal circulation fan 46 of receiving, dry the another side of polyvinyl alcohol membrane, and fan 48 and circulation channel 45 cooperate, circulate out fan housing 41 spun hot-blast, evenly dry the polaroid, in order to reach the purpose that improves the utilization ratio of heat energy.

The utility model is described above with reference to the accompanying drawings, it is obvious that the utility model is not limited to the above-described embodiments, and it is within the scope of the utility model to adopt such insubstantial modifications of the inventive method concept and solution, or to apply the inventive concept and solution directly to other applications without modification.

Claims

1. The stretching device for the polarizing film is characterized by comprising a dyeing and stretching mechanism (1), an unreeling mechanism (2) and a drying mechanism (3), wherein the unreeling mechanism (2) and the drying mechanism (3) are respectively arranged on the dyeing and stretching mechanism (1), the dyeing and stretching mechanism (1) comprises a dyeing treatment tank (11), a cross-linking treatment tank (12), a stretching treatment tank (13) and an adjusting treatment tank (14) which are sequentially arranged, driving rollers (15) are respectively arranged on two sides of each treatment tank, a plurality of guide rollers (16) used for conveying raw material films on the unreeling mechanism (2) are respectively arranged between the driving rollers (15), the raw material films can be conveyed into the drying mechanism (3) after passing through each treatment tank, the drying mechanism (3) comprises a drying box (31) and a drying circulation component (4) arranged in the drying box (31), and the drying circulation component (4) is used for recycling hot air in the drying box (31), the raw material film is dried.

2. The stretching device for polarizing film according to claim 1, wherein the drying cycle assembly (4) comprises an air outlet cover (41) disposed at the top of the drying box (31) and a cycle cover (42) disposed at the bottom of the drying box (31), an electric heating tube (44) and an air suction fan (43) are disposed at the top end of the air outlet cover (41), the air suction fan (43) is installed at an air inlet at the top end of the air outlet cover (41), the electric heating tube (44) is disposed between the air suction fan (43) and the air outlet cover (41), an outlet of the air outlet cover (41) corresponds to an outlet of the cycle cover (42), a cycle channel (45) is disposed at the bottom end of the cycle cover (42), inlets at two ends of the cycle channel (45) face upward and are disposed at two sides of the raw material film for receiving hot air ejected from the air outlet cover (41), an inlet of the cycle cover (42) is communicated with the middle of the cycle channel (45), and a circulating fan (46) is arranged at the inlet of the circulating cover (42).

3. The stretching device for the polarizing film as claimed in claim 2, wherein through slots (47) are formed at both sides of the air-out housing (41), and a blower (48) is installed on the through slots (47), an inlet of the blower (48) is communicated with the air-out housing (41), and an outlet thereof corresponds to the circulation channel (45).

4. The stretching apparatus of a polarizing film according to claim 1, wherein driving rollers (15) at both sides of the stretching processing tank (13) are adjusted in rotation speed by a controller for stretching the raw material film.

5. The stretching device for polarizing film according to claim 2, wherein exhaust passages (49) are provided at both sides of the air outlet housing (41), and the exhaust passages (49) are provided at the top end of the drying box (31).

6. The stretching device of a polarizing film as claimed in claim 5, wherein the top openings of the air discharge passage (49) and the air outlet cover (41) are provided with dust screens.