Drying and mixing device for producing biaxially oriented polyester film

Abstract

The utility model discloses a drying and mixing device for producing a biaxially oriented polyester film, which relates to the technical field of film production and is characterized in that an inlet of a pre-mixer is communicated with a polyester acid tank and a polyester alcohol tank, an outlet of the pre-mixer is communicated with a first dryer, and an outlet of the first dryer is communicated with a reaction tank; an inlet of the reaction tank is communicated with a solvent tank and a catalyst tank, and an outlet of the reaction tank is communicated with a polyester resin tank. The pre-mixing machine is used for preliminarily mixing two raw materials including polyester acid and polyester alcohol, then the mixture enters the first dryer to be dried, the dried polyester acid and polyester alcohol enter the reaction tank to react, polyester resin is obtained, and the polyester resin is used for subsequent film production. The two raw materials of polyester acid and polyester alcohol are uniformly mixed through the premixing machine, the subsequent esterification reaction is facilitated, the yield and the quality of the polyester resin are improved, the moisture content of the obtained polyester resin is greatly reduced through drying before the reaction, and the quality of a subsequent polyester film is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of film production, in particular to a drying and mixing device for producing a biaxially stretched polyester film. Background Art

[0002] Polyester film is a polymer synthetic material, widely used in electronics, food, medicine and other fields. It has excellent physical and chemical properties and is widely used in packaging, insulation, shading, reflection, antistatic and other fields. The main raw material of polyester film is polyester resin, which is usually made by esterification reaction of polyester acid and polyester alcohol.

[0003] The requirements for the moisture content of raw materials in the production process of polyester film are very strict. "The Influence of Drying Process of Biaxially Stretch Polyester Film Production Line on Film Production and Performance" (Anhui Chemical Industry, February 2021, Vol. 47, No. 1, Peng Chao) proves that the moisture content will have an important impact on the stability, thickness uniformity and performance of film production. Therefore, how to reduce the moisture content of raw materials in the production of biaxially oriented polyester film is very important. Summary of the invention

[0004] The technical problem to be solved by the utility model is: in view of the shortcomings of the prior art, a drying and mixing device for producing a biaxially stretched polyester film is provided, the moisture content of the obtained polyester resin raw material is low, which is beneficial to improving the quality of the polyester film product.

[0005] In order to solve the above technical problems, the technical solution of the utility model is:

[0006] A dry mixing device for producing biaxially oriented polyester film comprises a premixer, the inlet of the premixer is connected to a polyester acid tank and a polyester alcohol tank, the outlet of the premixer is connected to a first dryer, the outlet of the first dryer is connected to a reaction tank, the inlet of the reaction tank is connected to a solvent tank and a catalyst tank, and the outlet of the reaction tank is connected to a polyester resin tank.

[0007] As an improved technical solution, the outlet of the reaction tank is connected to a second dryer, and the outlet of the second dryer is connected to a polyester resin tank.

[0008] As an improved technical solution, the premixer is a horizontal weightless mixer.

[0009] As an improved technical solution, the first dryer includes a hollow stirring shaft, the outer side of the stirring shaft is connected to a plurality of hollow stirring columns, a plurality of the stirring columns are provided with a plurality of first air outlets, and one end of the stirring shaft passes through the first dryer and is connected to an air inlet pipe.

[0010] As an improved technical solution, the plurality of stirring columns include a first rotating column and a second rotating column uniformly arranged along the axial direction of the stirring shaft, and adjacent first rotating columns and second rotating columns are alternately arranged along the circumferential direction of the stirring shaft.

[0011] As an improved technical solution, adjacent first rotating columns and second rotating columns are alternately arranged along the axial direction of the stirring shaft.

[0012] As a preferred technical solution, scrapers are respectively provided at the ends of the first rotating column and the second rotating column.

[0013] As a preferred technical solution, a plurality of second air outlet holes are provided on the outer side of the scraper.

[0014] As a preferred technical solution, the first dryer is provided with a heating jacket, and the heating jacket is provided with a heat medium inlet and a heat medium outlet.

[0015] Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0016] The utility model discloses a drying and mixing device for producing a biaxially stretched polyester film, comprising a premixer, the inlet of the premixer is connected to a polyester acid tank and a polyester alcohol tank, the outlet of the premixer is connected to a first dryer, the outlet of the first dryer is connected to a reaction tank, the inlet of the reaction tank is connected to a solvent tank and a catalyst tank, and the outlet of the reaction tank is connected to a polyester resin tank. The premixer first preliminarily mixes the two raw materials of polyester acid and polyester alcohol, and then enters the first dryer for drying. The dried polyester acid and polyester alcohol enter the reaction tank for reaction to obtain a polyester resin, which is used for subsequent film production. The premixer allows the two raw materials of polyester acid and polyester alcohol to be mixed evenly, which facilitates the subsequent esterification reaction and improves the yield and quality of the polyester resin. The drying before the reaction greatly reduces the moisture content of the obtained polyester resin and improves the quality of the subsequent polyester film.

[0017] The outlet of the reaction tank of the utility model is connected to the second dryer, and the outlet of the second dryer is connected to the polyester resin tank. The polyester resin obtained by the reaction is dried again by the second dryer, the moisture content of the polyester resin is lower, and the quality of the polyester film obtained is better.

[0018] The premixer is a horizontal weightless mixer, which has a better mixing effect of polyester acid and polyester alcohol and is beneficial to the preparation of polyester resin.

[0019] The first dryer includes a hollow stirring shaft, and the outer side of the stirring shaft is connected to a plurality of hollow stirring columns, and the plurality of the stirring columns are provided with a plurality of first air outlets, and one end of the stirring shaft passes through the first dryer and is connected to an air inlet pipe. Hot air or hot nitrogen is introduced through the air inlet pipe, and the hot air or hot nitrogen flows out from the first air outlet and dries the material in the first dryer, so that the drying effect is better, and the stirring columns are used to stir the material, so that the material is dried more evenly, and the drying time is shortened.

[0020] The plurality of stirring columns include a first rotating column and a second rotating column uniformly arranged along the axial direction of the stirring shaft, and the adjacent first rotating columns and the second rotating columns are alternately arranged along the circumferential direction of the stirring shaft. The adjacent first rotating columns and the second rotating columns are alternately arranged along the axial direction of the stirring shaft. The first rotating columns and the second rotating columns alternately arranged in the circumferential and axial directions have a better mixing effect on the material in the first dryer, greatly reducing the stirring dead angle, and at the same time, with the hot air or hot nitrogen flowing out from the first air outlet, the drying effect of the material is better and more uniform.

[0021] The ends of the first rotating column and the second rotating column are respectively provided with scrapers, which are used to scrape off the materials attached to the inner wall of the first dryer to prevent the materials from sticking to the wall and affecting the yield and quality of the polyester resin product.

[0022] A plurality of second air outlets are arranged on the outer side of the scraper. The hot air or hot nitrogen flowing out of the second air outlets can be used to purge the inner wall of the first dryer, and the scraper can be used to better remove the wall-hanging materials.

[0023] The first dryer is provided with a heating jacket, and the heating jacket is provided with a heat medium inlet and a heat medium outlet. The jacket is heated in conjunction with hot air or hot nitrogen introduced into the interior, so that the heating effect is better, the drying cycle is shortened, and the drying process is more gentle. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0025] Figure 1 It is a structural schematic diagram of an embodiment of the utility model;

[0026] Figure 2 It is a cross-sectional view of an embodiment of the utility model;

[0027] Figure 3 yes Figure 2 Schematic diagram of the structure of the stirring shaft and stirring column;

[0028] Among them: 1. premixer; 2. polyester acid tank; 3. polyester alcohol tank; 4. first dryer; 5. reaction tank; 6. solvent tank; 7. catalyst tank; 8. polyester resin tank; 9. second dryer; 10. stirring shaft; 11. stirring column; 12. first air outlet; 13. air inlet pipe; 14. first rotating column; 15. second rotating column; 16. scraper; 17. second air outlet; 18. heating jacket; 19. heat medium inlet; 20. heat medium outlet; 21. bearing. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0030] like Figure 1-3 As shown, a dry mixing device for producing a biaxially stretched polyester film comprises a premixer 1, the inlet of the premixer 1 is connected to a polyester acid tank 2 and a polyester alcohol tank 3, the outlet of the premixer 1 is connected to a first dryer 4, the outlet of the first dryer 4 is connected to a reaction tank 5, the inlet of the reaction tank 5 is connected to a solvent tank 6 and a catalyst tank 7, and the outlet of the reaction tank 5 is connected to a polyester resin tank 8. The premixer 1 first preliminarily mixes the two raw materials of polyester acid and polyester alcohol, and then enters the first dryer 4 for drying. The dried polyester acid and polyester alcohol enter the reaction tank 5 for reaction to obtain a polyester resin, which is used for subsequent film production. The premixer 1 makes the two raw materials of polyester acid and polyester alcohol mixed evenly, which is convenient for the subsequent esterification reaction, and improves the yield and quality of the polyester resin. By drying before the reaction, the moisture content of the obtained polyester resin is greatly reduced, and the quality of the subsequent polyester film is improved.

[0031] The outlet of the reaction tank 5 is connected to a second dryer 9, and the outlet of the second dryer 9 is connected to a polyester resin tank 8. The polyester resin obtained by the reaction is dried again by the second dryer 9, the moisture content of the polyester resin is lower, and the quality of the polyester film obtained is better.

[0032] The premixer 1 is a horizontal weightless mixer, which has a better mixing effect of polyester acid and polyester alcohol, and is beneficial to the preparation of polyester resin.

[0033] The first dryer 4 includes a hollow stirring shaft 10, and the outer side of the stirring shaft 10 is connected to a plurality of hollow stirring columns 11, and the plurality of the stirring columns 11 are provided with a plurality of first air outlets 12. One end of the stirring shaft 10 passes through the first dryer 4 and is connected to an air inlet pipe 13. A bearing 21 is provided at the side wall where the stirring shaft 10 passes through the first dryer 4. The air inlet pipe 13 is inserted into the hollow cavity of the stirring shaft 10, and a bearing 21 is also provided between the outer side of the air inlet pipe 13 and the inner wall of the stirring shaft 10, so that the air inlet pipe 13 does not rotate with the rotation of the stirring shaft 10 and is well sealed. Hot air or hot nitrogen is introduced through the air inlet pipe 13, and the hot air or hot nitrogen flows out from the first air outlet 12 and dries the material in the first dryer 4, so that the drying effect is better, and the stirring column 11 is used to stir the material, so that the material is dried more evenly and the drying time is shortened.

[0034] The plurality of stirring columns 11 include a first rotating column 14 and a second rotating column 15 uniformly arranged along the axial direction of the stirring shaft 10, and the adjacent first rotating columns 14 and the second rotating columns 15 are alternately arranged along the circumference of the stirring shaft 10. The adjacent first rotating columns 14 and the second rotating columns 15 are alternately arranged along the axial direction of the stirring shaft 10. The first rotating columns 14 and the second rotating columns 15 alternately arranged in the circumferential and axial directions have a better mixing effect on the material in the first dryer 4, greatly reducing the stirring dead angle, and at the same time, with the hot air or hot nitrogen flowing out from the first air outlet 12, the drying effect of the material is better and more uniform.

[0035] The ends of the first rotating column 14 and the second rotating column 15 are respectively provided with scrapers 16. The scrapers 16 are used to scrape off the materials attached to the inner wall of the first dryer 4 to prevent the materials from sticking to the wall and affecting the yield and quality of the polyester resin product.

[0036] A plurality of second air outlets 17 are provided on the outer side of the scraper 16. The hot air or hot nitrogen flowing out of the second air outlets 17 can be used to purge the inner wall of the first dryer 4, and the scraper 16 can be used to better remove the wall-hanging materials.

[0037] The first dryer 4 is provided with a heating jacket 18, and the heating jacket 18 is provided with a heat medium inlet 19 and a heat medium outlet 20. The jacket is heated in conjunction with the hot air or hot nitrogen introduced into the interior, so that the heating effect is better, the drying cycle is shortened, and the drying process is more gentle.

[0038] It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

Claims

1. A dry mixing device for producing biaxially oriented polyester film, characterized in that: It comprises a premixer, the inlet of the premixer is connected to a polyester acid tank and a polyester alcohol tank, the outlet of the premixer is connected to a first dryer, the outlet of the first dryer is connected to a reaction tank, the inlet of the reaction tank is connected to a solvent tank and a catalyst tank, and the outlet of the reaction tank is connected to a polyester resin tank.

2. A dry mixing device for producing biaxially oriented polyester film according to claim 1, characterized in that: The outlet of the reaction tank is connected to a second dryer, and the outlet of the second dryer is connected to a polyester resin tank.

3. A dry mixing device for producing biaxially oriented polyester film according to claim 1, characterized in that: The premixer is a horizontal weightless mixer.

4. A dry mixing device for producing a biaxially oriented polyester film according to claim 1, characterized in that: The first dryer comprises a hollow stirring shaft, the outer side of the stirring shaft is connected with a plurality of hollow stirring columns, a plurality of the stirring columns are provided with a plurality of first air outlets, and one end of the stirring shaft passes through the first dryer and is connected with an air inlet pipe.

5. A dry mixing device for producing a biaxially oriented polyester film as claimed in claim 4, characterized in that: The plurality of stirring columns include first rotating columns and second rotating columns uniformly arranged along the axial direction of the stirring shaft, and adjacent first rotating columns and second rotating columns are alternately arranged along the circumferential direction of the stirring shaft.

6. A dry mixing device for producing biaxially oriented polyester film according to claim 5, characterized in that: The adjacent first rotating columns and the second rotating columns are alternately arranged along the axial direction of the stirring shaft.

7. A dry mixing device for producing a biaxially oriented polyester film as claimed in claim 5, characterized in that: Scrapers are respectively provided at the ends of the first rotating column and the second rotating column.

8. A dry mixing device for producing a biaxially oriented polyester film as claimed in claim 7, characterized in that: A plurality of second air outlet holes are arranged on the outer side of the scraper.

9. A dry mixing device for producing a biaxially oriented polyester film according to claim 1, characterized in that: The first dryer is provided with a heating jacket, and the heating jacket is provided with a heat medium inlet and a heat medium outlet.

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