A device for improving air bubbles in a three-layer polarizer film

Abstract

This utility model relates to the field of polarizer production technology and discloses a device for improving air bubbles in a three-layer polarizer film. It includes a waste glue tank, a bonding roller, and a peristaltic pump. A vacuum pump is located on one side of the waste glue tank. Stainless steel dispensing heads are located on both sides of the top of the bonding roller. A silicone tube is attached to one end of each stainless steel dispensing head, and a pulse damper is attached to one end of each silicone tube. A throttle valve is attached to one end of each pulse damper, and the peristaltic pump is attached to one end of each throttle valve. When the vacuum pump operates, the pressure inside the waste glue tank decreases, thereby sucking away excess waste glue from the bonding roller. The stainless steel dispensing heads on both sides above the bonding roller are connected by silicone tubes, and the peristaltic pump draws the glue. A pulse damper is also connected after the peristaltic pump, and the pressure inside the silicone tube is adjusted by the throttle valve, thereby effectively suppressing the problem of glue pulsation and reducing air bubbles generated by glue impact during dispensing.

Description

Technical Field

[0001] This utility model relates to the field of polarizer production technology, specifically to a device for improving air bubbles in a three-layer polarizer film. Background Technology

[0002] A polarizer is an optical thin film material, also known as a polarizing film. Its core layer is a PVA (polyvinyl alcohol) film. PVA film is a high molecular weight polymer that, when stretched under specific conditions, exhibits light-selective properties, thus providing polarization performance. Because PVA film deforms quickly in humid and hot environments, making it inconvenient to use and process, it is usually laminated with a layer of high-strength, high-transmittance, and humid- and heat-resistant TAC (cellulose triacetate) film on both sides for protection.

[0003] In the production process of polarizers, two layers of TAC film and one layer of PVA film need to be bonded together using a composite roller to form a substrate. During the bonding process, pressure-sensitive adhesive is applied to the surface of the TAC film or PVA film. The pressure of the composite roller makes the two layers of TAC film and the middle PVA film firmly bonded together to form a stable polarizer structure.

[0004] In the dispensing process, peristaltic pumps are typically used as the primary power source for adhesive delivery. However, peristaltic pumps use rotating rollers or rotors to alternately squeeze the tubing, transporting fluid from one end of the pump to the other. Each pump dispenses the volume of adhesive between the two rollers. This intermittent squeezing and releasing action causes periodic fluctuations in liquid pressure and flow rate, creating a pulsating phenomenon. This results in unstable adhesive output, which can cause air bubbles to form during dispensing, affecting the bonding quality of the polarizer substrate. Summary of the Invention

[0005] The purpose of this invention is to provide a device for improving air bubbles in a three-layer polarizer film, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a device for improving air bubbles in a three-layer polarizer film, comprising a waste glue tank, a bonding roller, and a peristaltic pump. A vacuum pump is provided on one side of the waste glue tank. Stainless steel glue dispensing heads are provided on both sides of the top of the bonding roller. A silicone tube is provided at one end of each stainless steel glue dispensing head. A pulse damper is provided at one end of each silicone tube. A throttling valve is provided at one end of each pulse damper. A peristaltic pump is provided at one end of each throttling valve. A feed pipe is provided at one end of each peristaltic pump. A glue suction nozzle is provided on one side of the waste glue tank, and the glue suction nozzle is located at both ends of the bonding roller.

[0007] Furthermore, a glue tank is provided at one end of the feed pipe, and a constant temperature water bath is provided on the outside of the glue tank.

[0008] Furthermore, the distance between the end of the feed pipe located inside the glue bucket and the end of the stainless steel drip nozzle outlet is less than one meter.

[0009] Furthermore, there are two bonding rollers, which are placed in parallel.

[0010] Furthermore, one end of the suction nozzle is flat, one end of the vacuum pump is connected to one side of the upper part of the waste glue tank through a pipe, the suction nozzle is connected to one side of the middle part of the waste glue tank through a pipe, and a discharge valve is provided on one side of the lower part of the waste glue tank.

[0011] Furthermore, the constant temperature water bath temperature is 25-35℃, and the peristaltic pump speed is set to 25-50rpm.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] When the vacuum pump of this invention is working, the pressure inside the waste glue tank decreases, thereby sucking away excess waste glue from the bonding roller. Stainless steel dispensing heads are located on both sides above the bonding roller, connected by silicone tubes. A peristaltic pump draws the glue. A pulse damper is also connected after the peristaltic pump, and a throttle valve adjusts the pressure inside the silicone tube, effectively suppressing glue pulsation and reducing air bubbles generated by glue impact during dispensing.

[0014] The parts of the device not covered herein are the same as or can be implemented using existing technologies. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the equipment process for a three-layer film bubble improvement device for polarizers according to this utility model;

[0016] Figure 2 This is a schematic diagram of the peristaltic pump connection structure of a three-layer film bubble improvement device for polarizers according to this utility model.

[0017] In the diagram: 1. Vacuum pump; 2. Waste glue container; 3. Stainless steel glue dispensing head; 4. Glue suction nozzle; 5. Laminating roller; 6. Silicone tube; 7. Pulse damper; 8. Throttling valve; 9. Peristaltic pump; 10. Glue bucket; 11. Thermostatic water bath. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] Please see Figures 1-2This utility model provides a technical solution: a device for improving air bubbles in a three-layer polarizer film, comprising a waste glue tank 2, a bonding roller 5, and a peristaltic pump 9. A vacuum pump 1 is provided on one side of the waste glue tank 2. The vacuum pump 1 reduces the pressure inside the waste glue tank 2 to create a negative pressure environment, thereby effectively sucking away excess waste glue from the bonding roller 5, keeping the bonding area clean, and preventing waste glue from adversely affecting the quality of the polarizer. Stainless steel glue dispensing heads 3 are provided on both sides of the top of the bonding roller 5. The stainless steel glue dispensing heads 3 are located on both sides above the bonding roller 5, which can ensure that the glue is evenly and accurately dispensed onto the bonding area of ​​two layers of TAC film and one layer of PVA film, improving the bonding accuracy and efficiency.

[0020] The stainless steel dispensing head 3 has a silicone tube 6 at one end. The silicone tube 6 has good flexibility and corrosion resistance, which ensures that the glue is not contaminated during transportation. At the same time, the peristaltic pump 9 pumps the glue by squeezing the silicone tube 6. This does not generate shear force on the glue, thus protecting the glue's performance.

[0021] A pulse damper 7 is installed at one end of the silicone tube 6, a throttle valve 8 is installed at the other end of the pulse damper 7, a peristaltic pump 9 is installed at the other end of the throttle valve 8, and a feed pipe is installed at the other end of the peristaltic pump 9. A suction nozzle 4 is installed on one side of the waste glue tank 2, located at both ends of the bonding roller 5. The pulse damper 7 absorbs and smooths the pulse flow generated by the peristaltic pump 9, keeping the glue pressure and flow rate stable, reducing the generation of bubbles caused by sudden changes in pressure and flow, and improving the stability and quality of the glue dispensing. The throttle valve 8 regulates the pressure inside the silicone tube 6 by controlling the cross-sectional area of ​​the fluid channel, further stabilizing the pressure inside the tube, reducing the generation of bubbles caused by pressure changes, and ensuring a smooth glue dispensing process.

[0022] When the adhesive flows from the peristaltic pump 9 into the throttle valve 8, rotating or moving the valve core changes the gap between the valve core and the valve seat. A larger gap allows for a larger cross-sectional area for the fluid to pass through, resulting in lower resistance and greater flow rate and pressure of the adhesive. Conversely, a smaller gap allows for a smaller cross-sectional area for the fluid to pass through, resulting in higher resistance and lower flow rate and pressure of the adhesive. In this way, the pressure and flow rate of the adhesive within the silicone tube 6 can be precisely adjusted according to actual needs.

[0023] When the peristaltic pump 9 delivers the adhesive, it generates periodic pressure pulses. During the pressure rise phase, the adhesive enters the liquid chamber of the pulse damper 7, pushing the diaphragm towards the gas chamber and compressing the gas inside. The compressed gas stores some energy, thus absorbing some of the pressure pulse energy and slowing the pressure rise. During the pressure decrease phase, the compressed gas in the gas chamber expands, pushing the diaphragm towards the liquid chamber and replenishing the stored adhesive into the pipeline, preventing a sharp drop in pressure. Through this gas compression and expansion process, the pressure pulses are buffered and absorbed.

[0024] A glue tank 10 is installed at one end of the feed pipe, and a constant temperature water bath 11 is installed on the outside of the glue tank 10. The glue tank 10 serves as a storage container for the glue, providing a stable supply of glue for the dispensing process and ensuring continuous production. The glue is pre-filtered using a filtration device, and after filtration, it is defoamed using a vacuum defoaming device for 4-6 hours. After removing the air bubbles from the glue, it is placed in a constant temperature water bath to maintain a temperature of 25-35℃.

[0025] The thermostatic water bath 11 can maintain a stable temperature of the adhesive in the adhesive container 10, preventing changes in adhesive viscosity due to temperature variations, which would affect the accuracy and stability of dispensing. A suitable temperature range helps the adhesive maintain optimal flowability and viscosity.

[0026] The distance between one end of the feed pipe inside the glue tank 10 and the other end of the stainless steel dispensing head 3 is less than one meter. The constant temperature water bath 11 is no more than one meter away from the bonding roller 5 to avoid excessively long glue extraction pipes that may contain air bubbles. A shorter feed pipe also reduces resistance during glue transport, lowers the likelihood of air bubble formation, and ensures the glue reaches the dispensing head quickly and accurately, improving dispensing efficiency.

[0027] There are two bonding rollers 5, which are placed in parallel. The two parallel bonding rollers 5 can ensure that the two layers of TAC film and one layer of PVA film are subjected to uniform pressure during the bonding process, improve the tightness and flatness of the bonding, and thus produce high-quality polarizing film.

[0028] The suction nozzle 4 has a flattened end, which allows it to better conform to the surface of the bonding roller 5, effectively removing excess waste glue while minimizing interference with the bonding area and maintaining the stability of the bonding process. One end of the vacuum pump 1 is connected to the upper part of the waste glue tank 2 via a pipe, and the suction nozzle 4 is connected to the middle part of the waste glue tank 2 via a pipe. A discharge valve is located on the lower part of the waste glue tank 2. This connection method ensures that waste glue is effectively drawn into the waste glue tank 2, and the reasonable pipe layout reduces waste glue residue and blockage during transportation, improving the efficiency of waste glue processing. The discharge valve facilitates regular cleaning of the waste glue in the waste glue tank 2, keeping it clean and ensuring its normal use.

[0029] The constant temperature water bath 11 maintains a water bath temperature of 25-35℃, and the peristaltic pump 9 is set to a speed of 25-50 rpm. This suitable water bath temperature range ensures that the adhesive maintains stable viscosity and flowability during delivery and dispensing, preventing changes in adhesive properties due to excessively high or low temperatures, which could affect the quality of the polarizer. A reasonable peristaltic pump 9 speed ensures that the adhesive is delivered to the dispensing head at a stable flow rate, while avoiding uneven dispensing or air bubbles caused by excessively high or low speeds, thus improving the accuracy and stability of the dispensing process.

[0030] When vacuum pump 1 is working, the pressure inside waste glue tank 2 decreases, thereby sucking away excess waste glue from bonding roller 5. Stainless steel glue dispensing heads 3 are located on both sides above bonding roller 5, and the stainless steel glue dispensing heads 3 are connected by silicone tubes 6. Glue is drawn by peristaltic pump 9. A pulse damper 7 is also connected after peristaltic pump 9, and the pressure inside silicone tube 6 is adjusted by throttle valve 8, thereby effectively suppressing glue dispensing pulsation and reducing air bubbles generated by glue impact during dispensing.

[0031] Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

Claims

1. A polarizer three-layer film bubble improvement device, comprising a waste glue tank (2), a laminating roller (5) and a peristaltic pump (9), characterized in that: A vacuum pump (1) is provided on one side of the waste glue tank (2), and stainless steel glue-drip heads (3) are provided on both sides of the top of the bonding roller (5). A silicone tube (6) is provided at one end of the stainless steel glue-drip head (3), a pulse damper (7) is provided at one end of the silicone tube (6), a throttle valve (8) is provided at one end of the pulse damper (7), a peristaltic pump (9) is provided at one end of the throttle valve (8), a feed pipe is provided at one end of the peristaltic pump (9), and a glue-suction nozzle (4) is provided on one side of the waste glue tank (2). The glue-suction nozzle (4) is located at both ends of the bonding roller (5).

2. The device for improving air bubbles in a three-layer polarizer film according to claim 1, characterized in that: One end of the feed pipe is provided with a glue tank (10), and a constant temperature water bath (11) is provided on the outside of the glue tank (10).

3. The device for improving air bubbles in a three-layer polarizer film according to claim 2, characterized in that: The distance between the end of the feed pipe located inside the glue bucket (10) and the end of the stainless steel drip head (3) outlet is less than one meter.

4. The device for improving air bubbles in a three-layer polarizer film according to claim 1, characterized in that: There are two bonding rollers (5), and the two bonding rollers (5) are placed in parallel.

5. The device for improving air bubbles in a three-layer polarizer film according to claim 1, characterized in that: One end of the suction nozzle (4) is flat, one end of the vacuum pump (1) is connected to the upper half of the waste glue tank (2) through a pipe, the suction nozzle (4) is connected to the middle of the waste glue tank (2) through a pipe, and a discharge valve is provided on the lower half of the waste glue tank (2).

6. The device for improving air bubbles in a three-layer polarizer film according to claim 2, characterized in that: The constant temperature water bath (11) has a water bath temperature of 25-35℃, and the peristaltic pump (9) has a rotation speed of 25-50rpm.

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