A polarizing sheet aqueous waste rubber drying device

Abstract

The application relates to a polaroid water-based waste glue drying device, which comprises a box body, a bottom groove and a heating roller, the bottom groove is connected to the bottom of the box body through a rotating connecting part, the bottom groove rotates around the rotating connecting part between a first position and a second position, the heating roller is arranged in the interior of the box body, and a water-based waste glue input pipeline located at the upper portion of the heating roller and a waste gas discharge pipeline are arranged on the box body. The device can effectively dry the water-based waste glue generated on a polaroid production line, the water removal rate can reach more than 80%, and the transportation cost and subsequent treatment cost of the water-based waste glue are greatly reduced.

Description

Technical Field

[0001] This application relates to the technical field of polarizer processing equipment, specifically to a polarizer water-based waste glue drying equipment. Background Technology

[0002] Polarizing films are important optical materials widely used in liquid crystal displays (LCDs), organic light-emitting diode displays (OLEDs), and other optical display devices. Their basic structure consists of multiple layers, the core of which is a polyvinyl alcohol (PVA) layer, which polarizes light. However, PVA layers are highly susceptible to hydrolysis and environmental influences; therefore, protective films are typically applied to both sides of the PVA layer to protect its physical properties. Adhesive is used to ensure adhesion between the protective film and the PVA layer. With increasingly stringent environmental policies, traditional oil-based adhesives are gradually being replaced by water-based adhesives due to their poor environmental performance. Water-based adhesives not only comply with national environmental policies and regulations but also ensure the sustainable development of the adhesive industry.

[0003] Water-based adhesives, commonly known as water-based glues, are used to bond PVA layers to protective films. They are primarily composed of PVA powder and water, with water comprising over 95%. In addition, PVA contains approximately 5% methanol and about 1% acetone, both of which are toxic chemicals. The mixing process generates a large amount of waste adhesive, which is classified as hazardous waste, with the code "900-014-13" in the *National Hazardous Waste List (2025 Edition)*. The treatment of water-based waste adhesives with a water content as high as 95% has always been a challenge in the field of hazardous waste management.

[0004] The presence of water in the aforementioned water-based waste adhesives results in a significant increase in volume and weight, leading to substantial higher transportation costs. Furthermore, treating waste with high water content in most hazardous waste treatment facilities requires greater energy and resource consumption. Therefore, developing specialized drying and volume reduction equipment for water-based waste adhesives is essential. Summary of the Invention

[0005] The technical problem to be solved by this application is to provide a safe, efficient and environmentally friendly water-based waste glue drying device.

[0006] To solve the above-mentioned technical problems, this application can be implemented through the following technical solutions:

[0007] This application provides a polarizer water-based waste adhesive drying device, including a box body, a bottom trough, a heating roller, and a scraper device. The bottom trough is connected to the bottom of the box body through a rotating connection. The heating roller and the scraper device are located inside the box body. The box body is provided with a water-based waste adhesive inlet pipe and an exhaust gas outlet pipe located above the heating roller. The scraper device is located on the side of the heating roller away from the water-based waste adhesive inlet pipe.

[0008] Wherein: the bottom groove rotates around the rotating connecting part between a first position and a second position;

[0009] When the bottom groove is in the first position, the bottom groove and the bottom edge of the box body form a closed structure to support the water-based waste glue or dried water-based waste glue inside the box body.

[0010] When the bottom trough is in the second position, the end of the bottom trough away from the rotating connection part rotates and opens outwards towards the outside of the box body, allowing the dried water-based waste glue inside the box body to fall through the opening between the bottom trough and the box body.

[0011] As a further improvement of this application, the inlet of the water-based waste adhesive input pipe extends into the interior of the tank body and is located at the top of the heating roller, so that the water-based waste adhesive falls onto the surface of the heating roller.

[0012] As a further improvement of this application, the rotating connection part is a hinged structure.

[0013] As a further improvement of this application, the rotating connection part includes a hinge, which is used to connect the bottom groove to the box body. One side of the hinge is fixed to the bottom edge of the box body, and the other side of the hinge is fixed to one side edge of the bottom groove. The hinge is rotatably connected by a pivot pin.

[0014] As a further improvement of this application, a locking structure is provided between the edge of the bottom groove away from the rotating connection and the bottom of the box body.

[0015] As a further improvement of this application, the locking structure includes a locking hook and a locking buckle. The locking hook is fixed to the box body, one end of the locking buckle is hinged to one side edge of the bottom groove, and the other end of the locking buckle can be engaged with the locking hook.

[0016] As a further improvement to this application, the shape of the box body is any one of a cube, cuboid, or cylinder.

[0017] As a further improvement of this application, the bottom groove is a concave arc-shaped structure.

[0018] As a further improvement of this application, the box body is provided with an observation window for water-based waste glue feeding and an observation window for the heating roller.

[0019] As a further improvement of this application, the box body is provided with a scraper device observation window.

[0020] The specific benefits of this application are as follows: This application provides a water-based waste adhesive drying device for polarizers, which can effectively dry the water-based waste adhesive generated on the polarizer production line. The moisture removal rate can reach more than 80%, and the volume of water-based waste adhesive can be reduced by about 19 times, which greatly reduces the transportation cost of water-based waste adhesive. The dried waste adhesive is easier to handle, reducing energy consumption and processing resources in the subsequent treatment process, thereby reducing the cost of the entire hazardous waste treatment process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the polarizer water-based waste adhesive drying equipment in Example 1.

[0022] In the diagram: 1. Box body; 2. Bottom trough; 3. Heating roller; 4. Rotating connection; 5. Locking structure; 6. Water-based waste glue input pipe; 7. Exhaust gas discharge pipe; 8. Scraper device; 9. Water-based waste glue feeding observation window; 10. Heating roller observation window; 11. Scraper device observation window. Detailed Implementation

[0023] The present application will now be described in detail with reference to the embodiments shown in the accompanying drawings. However, these embodiments do not limit the present application, and any structural, methodological, or functional modifications made by those skilled in the art based on these embodiments are included within the scope of protection of this application.

[0024] This application provides a polarizer water-based waste adhesive drying device, including a box body, a bottom trough, a heating roller, and a scraper device. The bottom trough is connected to the bottom of the box body through a rotating connection. The heating roller and the scraper device are located inside the box body. The box body is provided with a water-based waste adhesive inlet pipe and an exhaust gas outlet pipe located above the heating roller. The scraper device is located on the side of the heating roller away from the water-based waste adhesive inlet pipe.

[0025] Wherein: the bottom groove rotates around the rotating connecting part between a first position and a second position;

[0026] When the bottom groove is in the first position, the bottom groove and the bottom edge of the box body form a closed structure to support the water-based waste glue or dried water-based waste glue inside the box body.

[0027] When the bottom trough is in the second position, the end of the bottom trough away from the rotating connection part rotates and opens outwards towards the outside of the box body, allowing the dried water-based waste glue inside the box body to fall through the opening between the bottom trough and the box body.

[0028] In an optional implementation, the box body is a bottom-opening container, and its shape can be, but is not limited to, any one of the following: cube, cuboid, cylinder, etc. The box body is made of a stainless steel frame, possessing good corrosion resistance and mechanical strength, and can adapt to industrial production environments. The heating roller is steam-heated and connected to an external steam pipe. The steam pressure is set to 0.7–1.0 MPa to ensure rapid drying of the water-based waste adhesive on the surface of the heating roller. The rotation speed of the heating roller is set to 12–15 revolutions / min to ensure uniform drying of the waste adhesive while avoiding excessive wear.

[0029] Furthermore, the scraper device is designed to remove dried water-based waste adhesive from the heating rollers. The scraper device includes a scraper and a screw bearing. The screw bearing is fixed to the housing body, and the scraper is fixed to the screw bearing. The screw bearing is used to adjust the angle of the scraper, which is adjustable within the range of 0 to 90°. This flexible and adjustable scraper angle facilitates the even removal of dried water-based waste adhesive from the heating rollers, further improving the drying effect.

[0030] In an optional embodiment, the inlet of the water-based waste adhesive input pipe extends into the interior of the tank body and is located above the heating roller, so that the water-based waste adhesive falls onto the surface of the heating roller. Preferably, the inlet of the water-based waste adhesive input pipe extends 100-150 mm into the interior of the tank body, and the tangential distance from the nearest edge of the heating roller is 50-55 mm. Under the pressure of 0.7 MPa from the external first pneumatic pump, the water-based liquid waste adhesive maintains a flow rate of 25-50 L / min, ensuring that 90%-95% of the water-based waste adhesive can directly contact the roller, thereby improving drying efficiency.

[0031] In an optional implementation, the exhaust gas discharge pipe is made of corrosion-resistant PP material and has a diameter of 300mm. Exhaust gas generated inside the enclosure is drawn to the exhaust gas purification and treatment facility under negative pressure. The exhaust gas discharge pipe is connected to the enclosure via flanges to ensure the safety and environmental friendliness of the exhaust gas treatment process.

[0032] In an optional embodiment, the rotating connection is a hinged structure. The rotating connection includes a hinge for connecting the bottom groove to the box body. One side of the hinge is fixed to the bottom edge of the box body, and the other side of the hinge is fixed to one side edge of the bottom groove. The hinge is rotatably connected by a pin. The rotating connection also includes a first sealing gasket for sealing the gap between the hinge and the box body and the bottom groove.

[0033] In a further optional embodiment, the rotating connection includes a hinge for connecting the bottom groove to the box body. One side of the hinge is fixed to the bottom edge of the box body, and the other side of the hinge is fixed to one side edge of the bottom groove. The hinge achieves a rotating connection via a pin. The pin passes through the connecting part of the hinge, allowing the bottom groove to rotate relative to the box body around the pin. Preferably, the hinge is made of corrosion-resistant metal, and its connecting parts are reinforced to enhance load-bearing capacity, ensuring structural stability and rotational flexibility during the bottom groove's loading and rotation. Simultaneously, a sealing structure is provided at the hinge connection to prevent dust and debris from entering and affecting rotational performance. Furthermore, the hinge's rotation angle range is adapted to switch between the bottom groove's closed position supporting water-based waste adhesive and its dried state, and its open position for unloading. More preferably, one side of the hinge is integrally formed with the bottom edge of the box body, and the other side of the hinge is integrally formed with one side edge of the bottom groove. The hinge is formed with the box body by a full welding process, and the other side of the hinge is formed with one side edge of the bottom groove by a full welding process.

[0034] In a further optional embodiment, the rotating connection includes a rotating shaft disposed at the bottom of the box body and a shaft hole disposed at a corresponding position in the bottom groove. The rotating shaft and the shaft hole are clearance-fitted, allowing the bottom groove to rotate relative to the box body around the rotating shaft. Preferably, the box body is provided with a bearing seat for mounting the rotating shaft, and the rotating shaft is fixed to the bearing seat by a bearing to reduce rotational friction and improve structural stability. The inner wall of the shaft hole is provided with a wear-resistant bushing to prevent wear caused by long-term rotation. The bearing seat and the rotating shaft are made of high-strength metal material, and the bearing seat is integrally formed with the box body or fixed by welding or bolting to ensure sufficient strength and rigidity during the bottom groove's loading of items and rotation. The rotation angle range of the shaft hole fitting structure meets the switching requirements of the bottom groove between a closed first position for supporting water-based waste glue and dried water-based waste glue and an open second position for unloading. More preferably, the bearing seat is integrally formed with the box body. Preferably, the bearing seat and the box body are manufactured by a full welding process.

[0035] In a further optional embodiment, the rotating connection includes a shaft hole located at the bottom of the box body and a rotating shaft located at a corresponding position in the bottom groove. The rotating shaft and the shaft hole are clearance-fitted, allowing the bottom groove to rotate relative to the box body around the rotating shaft. A bearing seat is provided on the bottom groove, and the rotating shaft is fixed to the bearing seat by a bearing to reduce rotational friction and improve structural stability. A wear-resistant bushing is provided on the inner wall of the shaft hole to prevent wear caused by long-term rotation. The bearing seat and the rotating shaft are made of high-strength metal. The bearing seat is integrally formed with the box body or fixed by welding or bolting to ensure sufficient strength and rigidity during the bottom groove's loading and rotation. The rotation angle range of the shaft hole fit structure meets the switching requirements of the bottom groove between a closed first position for supporting water-based waste adhesive and dried water-based waste adhesive, and an open second position for unloading. More preferably, the bearing seat and the bottom groove are integrally formed. Preferably, the bearing seat and the bottom groove are manufactured using a full welding process.

[0036] In an optional implementation, a locking structure is provided between the edge of the bottom groove away from the rotating connection and the bottom of the box body.

[0037] In a further optional embodiment, the locking structure includes a hook and a latch. The hook is fixed to the box body, one end of the latch is hinged to one side edge of the bottom groove, and the other end of the latch can engage with the hook. Preferably, the hook and the box body are integrally formed. Preferably, the hook and the box body are manufactured using a full welding process. When the latch engages with the hook, the bottom groove is in a first position, and the bottom groove and the bottom edge of the box body form a closed structure.

[0038] In an optional embodiment, the tank body is provided with an observation window for the water-based waste adhesive feed and an observation window for the heated roller. The water-based waste adhesive feed observation window is located adjacent to the water-based waste adhesive input pipe, while the heated roller observation window is located on the side of the tank body away from the water-based waste adhesive feed observation window. Both the water-based waste adhesive feed observation window and the heated roller observation window are made of transparent acrylic material. The acrylic material has a temperature resistance range of 100°C (high temperature) to -20°C (low temperature) and a thickness between 5mm and 20mm. The water-based waste adhesive feed observation window is used to observe the water-based waste adhesive feed process, and the heated roller observation window is used to observe the roller operation.

[0039] In addition, the box body is equipped with a scraper device observation window, which is located adjacent to the scraper device. The observation window is also made of transparent acrylic material, with a temperature tolerance range of 100℃ to -20℃ and a thickness between 5mm and 20mm. It is used to observe changes in the adhesive thickness on the roller to adjust the scraper angle. The upper and lower parts of the scraper device observation window utilize double-layer stainless steel grooved tracks. Each layer of stainless steel is 1-2mm thick and consists of four acrylic plates arranged in a staggered manner.

[0040] In an optional implementation, the bottom trough is a concave arc-shaped structure, which facilitates the collection of dried water-based waste adhesive.

[0041] In an optional implementation, the shape of the box body can be any one of a cube, cuboid, or cylinder.

[0042] This application also provides a specific embodiment, as follows:

[0043] Example 1

[0044] like Figure 1 As shown, this embodiment provides a polarizer water-based waste adhesive drying device, including a box body 1, a bottom groove 2, a heating roller 3, and a scraper device 8. The box body 1 is cylindrical in shape, and the bottom groove 2 is a concave arc-shaped structure. One side edge of the bottom groove 2 is connected to the bottom of the box body 1 through a rotating connection part 4. A locking structure 5 is provided between the other side edge of the bottom groove 2 away from the rotating connection part 4 and the bottom of the box body 1. The heating roller 3 and the scraper device 8 are located inside the box body 1. The box body 1 is provided with a water-based waste adhesive input pipe 6 located above the heating roller 3. The outlet of the water-based waste adhesive input pipe 6 extends into the upper part of the heating roller 3 to ensure that the water-based waste adhesive is evenly dried. The waste adhesive is evenly distributed on the heating roller 3. The top of the box body 1 is provided with an exhaust gas pipe 7. The scraper device 8 is located on the side of the heating roller 3 away from the water-based waste adhesive input pipe 6, so that the water-based waste adhesive can be dried on the heating roller 3 and then scraped off. The box body 1 is also provided with a water-based waste adhesive feeding observation window 9, a heating roller observation window 10, and a scraper device observation window 11. The water-based waste adhesive feeding observation window 9 is set close to the water-based waste adhesive input pipe 6 and is located at the top of the water-based waste adhesive input pipe 6. The scraper device observation window 11 is set close to the scraper device 8. The heating roller observation window 10 and the water-based waste adhesive feeding observation window 9 are respectively located on both sides of the heating roller 3.

[0045] Wherein: the bottom groove 2 rotates around the rotating connecting part 4 between a first position and a second position; when the bottom groove 2 is in the first position, the bottom groove 2 and the bottom edge of the box body 1 form a closed structure to support the water-based waste glue or dried water-based waste glue in the box body 1; when the bottom groove 2 is in the second position, the end of the bottom groove 2 away from the rotating connecting part 4 rotates and opens to the outside of the box body 1, so that the dried water-based waste glue in the box body 1 falls through the opening between the bottom groove 2 and the box body 1.

[0046] The working principle of the polarizer water-based waste adhesive drying equipment in this embodiment is as follows: When the bottom trough 2 is in the first position, the bottom trough 2 and the bottom edge of the box body 1 form a closed structure. At this time, the water-based waste adhesive input pipe 6 is connected to an external first pneumatic pump. The water-based waste adhesive enters through the water-based waste adhesive input pipe 6 at a preset flow rate through the action of the first pneumatic pump and is evenly distributed on the surface of the heating roller 3. The heating roller 3 is connected to a steam pipe and is evenly heated by steam. The heating roller 3 can evenly dry the water-based waste adhesive distributed on its surface. After the water-based waste adhesive is dried by the heating roller 3, it is evenly scraped off by the scraper device 8 and falls into the bottom of the box body 1. The generated non-condensable waste gas is discharged into the waste gas purification treatment facility through the waste gas emission pipe 7. When the drying equipment operates to a certain extent, the closed structure formed by the box body 1 and the bottom trough 2 carries a large amount of dried water-based waste adhesive, and the closed structure needs to be cleaned. Open the locking structure 5, and the end of the bottom groove 2 away from the rotating connection part 4 rotates outward towards the outside of the box body 1, so that the bottom groove 2 is in the second position. At this time, the dried water-based waste glue in the box body 1 falls through the opening between the bottom groove 2 and the box body 1, and the collection trolley collects the dried water-based waste glue. After the dried water-based waste glue is collected, the bottom groove 2 returns from the second position to the first position, and the locking structure 5 is closed. The drying equipment then collects the water-based waste glue again and dries it.

[0047] In addition, the polarizer water-based waste adhesive drying equipment of this application also includes a second pneumatic pump. According to theoretical calculations, about 90% to 95% of the water-based waste adhesive can directly contact the heating roller 3. At the same time, considering that some of the water-based waste adhesive stuck on the heating roller 3 will fall into the bottom tank 2, when the water-based waste adhesive in the bottom tank 2 accumulates to a certain amount, the bottom tank 2 can be opened, and the second pneumatic pump can be used to pump the remaining water-based waste adhesive in the bottom tank 2 back to the heating roller 3 through the water-based waste adhesive input pipe 6 to ensure maximum drying of the water-based waste adhesive.

[0048] To verify the operating efficiency of the polarizer water-based waste adhesive drying equipment of this application, the actual operating data are given below, as shown in Table 1.

[0049] Table 1

[0050]

[0051] According to the actual operating data in Table 1, the polarizer water-based waste adhesive drying equipment of this application has achieved good dehydration results in multiple batches of operation. For example, in the batch in February 2024, the amount of water-based waste adhesive generated was 2.93 tons, and the weight of the dried water-based waste adhesive was 0.305 tons, with a dehydration rate of 89%. In the batch in July 2024, the dehydration rate even reached 96%, significantly reducing the water content and volume of the water-based waste adhesive and reducing transportation and processing costs.

[0052] It should be noted that the above description is only for explaining the preferred embodiments of this application and is not intended to limit this application in any way. Therefore, any modifications or changes made to this application under the same inventive spirit should still be included within the scope of protection intended by this application.

Claims

1. A drying device for water-based waste adhesive of polarizing film, characterized in that, The device includes a box body, a bottom groove, a heating roller, and a scraper device. The bottom groove is connected to the bottom of the box body through a rotating connection. The heating roller and the scraper device are located inside the box body. The box body is provided with a water-based waste glue inlet pipe and a waste gas outlet pipe located above the heating roller. The scraper device is located on the side of the heating roller away from the water-based waste glue inlet pipe. Wherein: the bottom groove rotates around the rotating connecting part between a first position and a second position; When the bottom groove is in the first position, the bottom groove and the bottom edge of the box body form a closed structure to support the water-based waste glue or dried water-based waste glue inside the box body. When the bottom trough is in the second position, the end of the bottom trough away from the rotating connection part rotates and opens outwards towards the outside of the box body, allowing the dried water-based waste glue inside the box body to fall through the opening between the bottom trough and the box body.

2. The polarizing sheet aqueous waste glue drying apparatus according to claim 1, characterized by, The inlet of the water-based waste adhesive input pipe extends into the interior of the tank body and is located above the heating roller, so that the water-based waste adhesive falls onto the surface of the heating roller.

3. The polarizing sheet aqueous waste glue drying apparatus according to any one of claims 1-2, characterized by, The rotating connection part is a hinged structure.

4. The polarizer water-based waste adhesive drying equipment according to claim 3, characterized in that, The rotating connection includes a hinge, which connects the bottom groove to the box body. One side of the hinge is fixed to the bottom edge of the box body, and the other side of the hinge is fixed to one side edge of the bottom groove. The hinge is rotatably connected by a pivot pin.

5. The polarizer water-based waste adhesive drying equipment according to claim 3, characterized in that, A locking structure is provided between the edge of the bottom groove away from the rotating connection and the bottom of the box body.

6. The polarizer water-based waste adhesive drying equipment according to claim 5, characterized in that, The locking structure includes a hook and a latch. The hook is fixed to the box body, one end of the latch is hinged to one side edge of the bottom groove, and the other end of the latch can be engaged with the hook.

7. The polarizer water-based waste adhesive drying equipment according to claim 1, characterized in that, The shape of the box body can be any one of a cube, cuboid, or cylinder.

8. The polarizer water-based waste adhesive drying equipment according to claim 1, characterized in that, The bottom groove is a concave arc-shaped structure.

9. The polarizer water-based waste adhesive drying equipment according to claim 1, characterized in that, The main body of the box is equipped with an observation window for water-based waste glue feeding and an observation window for the heating roller.

10. The polarizer water-based waste adhesive drying equipment according to claim 1, characterized in that, The box body is equipped with a scraper device and an observation window.

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