A drying system and drying method for a high-speed thermally induced phase separation microporous membrane

Abstract

The present invention discloses a drying system and a drying method for a microporous diaphragm using a high-speed thermally induced phase separation method. The drying system is based on the previous drying method using a temperature-controlled drying roller and a circulating hot air system. An infrared heating device is provided at each end of the temperature-controlled drying roller. The infrared heating device is used to heat the two ends of the film by thermal radiation to increase the drying temperature at both ends of the film so that the extractant at the edge of the film can be completely volatilized before leaving the drying device. The thermal radiation from the infrared heating device compensates for the temperature difference caused by the thickness difference between the two ends and the middle part of the film, so that the entire film is evenly heated and dried, thereby improving the quality of the produced film. The drying method adopts the above-mentioned drying system, which has the advantages of simple structure, reasonable design, easy use, and good quality of the produced film.

Description

Technical Field

[0001] The present invention relates to the technical field of film drying, and in particular to a drying system for a microporous diaphragm using a high-speed thermally induced phase separation method. Background Art

[0002] Drying is a key step in the production process of thermally induced phase separation microporous membranes. The drying effect not only affects the quality of the film, but also affects the stability of the production line.

[0003] Because the film edges, formed during the stretching process, are not involved in the stretching process, they result in thickness variations. The greater the stretch ratio, the greater the thickness variation. Conventional drying methods, such as hot air and drying rollers, cannot achieve consistent film temperatures. Consequently, the film edges cannot reach the required drying temperature, preventing the extractant from the edges from fully evaporating. This leads to disordered volatilization of the extractant as the film exits the drying apparatus. This thickness variation also creates temperature differences within the film, leading to inconsistent shrinkage and susceptible to stress concentration, creating tear-prone areas at the film edges.

[0004] Therefore, how to develop a new drying system to solve the above problems has become an urgent problem to be solved. Summary of the Invention

[0005] In view of this, the present invention provides a drying system and drying method for a microporous membrane using a high-speed thermally induced phase separation method, so as to solve the problem that the hot air and drying roller drying used in conventional drying cannot make the film reach the same temperature, the membrane edge cannot reach the required drying temperature, resulting in the extractant at the membrane edge not being able to completely volatilize, causing the extractant to volatilize disorderly when the film leaves the drying device, affecting product quality.

[0006] In one aspect, the present invention provides a drying system for a high-speed thermally induced phase separation microporous membrane. The drying system is disposed in a drying and insulation chamber, wherein two wall panels are spaced apart in the drying and insulation chamber, and a plurality of support beams are disposed between the two wall panels. Each support beam has two ends fixedly connected to the two wall panels. The drying system includes: a plurality of temperature-controlled drying rollers, a plurality of infrared heating devices, and a circulating hot air system.

[0007] The plurality of temperature-controlled drying rollers are located between the support beams and are spaced and arranged parallel to the support beams. Both ends of each temperature-controlled drying roller are connected to two wall panels respectively.

[0008] The plurality of infrared heating devices are respectively arranged across the two ends of the plurality of temperature-controlled drying rollers, and each of the infrared heating devices includes: a bracket, an adjustment seat, a plurality of infrared heating units, a temperature sensor and a power regulator;

[0009] The bracket is in a door-like shape and consists of a crossbeam and two columns. The lower end of each column is connected to the adjacent support beam, and the upper end of each column is fixedly connected to the two ends of the crossbeam.

[0010] The adjustment seat is located below the crossbeam, and the upper end of the adjustment seat is fixedly connected to the lower surface of the crossbeam;

[0011] The infrared heating units correspond to the temperature-controlled drying rollers one by one, and each infrared heating unit is located on the outside of the corresponding temperature-controlled drying roller and is connected to the adjustment seat;

[0012] The temperature sensor is used for real-time detection of the film temperature at the outlet;

[0013] The input end of the power regulator is connected to the output end of the temperature sensor, and the output end of the power regulator is connected to the control end of each infrared heating unit to control and adjust the heating power;

[0014] The circulating hot air system is located in the drying and insulation chamber and is used to provide hot air circulation for the drying and insulation chamber.

[0015] Preferably, a connecting piece is provided at the lower end of each of the columns, and the columns are sleeved on the outside of the adjacent support beams through the connecting piece;

[0016] The connecting piece includes: an upper connecting piece, a lower connecting piece and two connecting bolts;

[0017] The lower end of the upper connecting member is open, and a first locking plate extending vertically outward is provided at the lower ends of both sides of the upper connecting member;

[0018] The upper end of the lower connecting member is open, and is arranged opposite to the upper connecting member, forming a sleeve with the upper connecting member, and has a shape corresponding to the support beam. A second locking plate extending vertically outward is provided on the upper ends of both sides of the lower connecting member;

[0019] The two connecting bolts are respectively located on both sides of the upper connecting member and pass through the first locking plate and the second locking plate in sequence to lock the upper connecting member and the lower connecting member.

[0020] Further preferably, the connecting member further comprises: a gasket;

[0021] The gasket is located between the first locking plate and the second locking plate.

[0022] Further preferably, the adjustment seat includes a plurality of adjustment racks;

[0023] The adjustment racks correspond to the infrared heating units one by one, and each adjustment rack is a frame structure. A mounting hole is provided on the adjustment rack, and a connecting bolt for connecting with the infrared heating unit (23) is installed in the mounting hole.

[0024] Further preferably, the mounting hole on the adjustment bracket is a long hole.

[0025] Further preferably, each of the infrared heating units comprises: a housing and a plurality of infrared heating tubes;

[0026] The shell is arc-shaped;

[0027] The plurality of infrared heating tubes are all located in the shell and are evenly spaced along the circumference of the shell. Both ends of each infrared heating tube are connected to the shell.

[0028] On the other hand, the present invention also provides a method for drying a microporous membrane using a high-speed thermally induced phase separation method, which is applicable to any of the above-mentioned drying systems. The drying method is specifically as follows:

[0029] The hot air circulation system is turned on in the drying and insulation chamber. After the hot air circulation is performed, the film is conveyed and dried by the temperature-controlled drying roller, and both ends of the film are heated and dried by heat radiation.

[0030] The drying system for high-speed thermally induced phase separation microporous diaphragms provided by the present invention is based on the previous drying methods of temperature-controlled drying rollers and circulating hot air systems. An infrared heating device is respectively provided at both ends of the temperature-controlled drying roller. The infrared heating device is used to heat the two ends of the film by thermal radiation to increase the drying temperature at both ends of the film so that the extractant at the edge of the film can be completely volatilized before leaving the drying device. The thermal radiation of the infrared heating device compensates for the temperature difference caused by the thickness difference between the two ends and the middle part of the film, so that the entire film is evenly heated and dried, thereby improving the quality of the produced film.

[0031] The drying system for the microporous diaphragm using the high-speed thermally induced phase separation method provided by the present invention has the advantages of simple structure, reasonable design, convenient use, and good quality of the produced film.

[0032] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0035] Figure 1 The structural intention of a drying system for a microporous membrane using a high-speed thermally induced phase separation method provided in an embodiment of the present invention;

[0036] Figure 2 A schematic structural diagram of an infrared heating device in a drying system for a microporous diaphragm using a high-speed thermally induced phase separation method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0037] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent like or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0038] In order to solve the problem that the hot air and drying roller drying used in conventional drying cannot make the film reach the same temperature, the membrane edge cannot reach the required drying temperature, resulting in the inability to completely volatilize the membrane edge extractant, causing the film to volatilize disorderly after leaving the drying device, thereby affecting product quality, this embodiment provides a high-speed thermally induced phase separation method microporous membrane drying system, which is arranged in a drying and insulation chamber, and two wall panels A are arranged at intervals in the drying and insulation chamber, and a plurality of support beams B are arranged between the two wall panels A. Usually, there are four support beams B, which are respectively located at the four corners of the wall panel A. The two ends of each support beam B are respectively fixedly connected to the two wall panels A. Figure 1 The drying system provided in this embodiment is mainly composed of multiple temperature-controlled drying rollers 1, multiple infrared heating devices 2 and a circulating hot air system, wherein the multiple temperature-controlled drying rollers 1 are located between the support beams B and are arranged in parallel with the support beams B. Each temperature-controlled drying roller 1 is connected to two wall panels A at both ends, and the multiple infrared heating devices 2 are respectively arranged across the two ends of the multiple temperature-controlled drying rollers 1.

[0039] See also Figure 2Each infrared heating device 2 is composed of a bracket 21, an adjustment seat 22, a plurality of infrared heating units 23, a temperature sensor and a power regulator, wherein the bracket 21 is in a door-like shape and is composed of a beam 211 and two columns 212. The lower end of each column 212 is connected to the adjacent support beam B, and the upper end of each column 212 is fixedly connected to the two ends of the beam 211 respectively. The adjustment seat 22 is located below the beam 211, and the upper end of the adjustment seat 22 is fixedly connected to the lower surface of the beam 211. The infrared heating unit 23 corresponds to the temperature-controlled drying roller 1 one by one. Each infrared heating unit 23 is located on the outside of the corresponding temperature-controlled drying roller 1 and is connected to the adjustment seat 22. The temperature sensor is used for real-time detection of the film temperature at the outlet. The input end of the power regulator is connected to the output end of the temperature sensor, and the output end of the power regulator is connected to the control end of each infrared heating unit 23 to control and adjust the heating power.

[0040] The circulating hot air system is located in the drying and insulation chamber and is used to provide hot air circulation for the drying and insulation chamber. It includes bellows arranged in pairs. The circulating hot air blown out by the bellows heats the film that is not in contact with the roller through heat convection.

[0041] The drying system provided in the above embodiment heats and dries the film by three methods: heat conduction, heat convection and heat radiation. Among them, heat conduction is achieved by a temperature-controlled drying roller. By changing the temperature of the medium in the roller flow channel, the surface temperature of the roller is changed by heat conduction, thereby heating the film in contact with the roller; heat convection is achieved by a circulating hot air system. The circulating hot air blown by the bellows arranged in pairs heats the film not in contact with the roller by heat convection; heat radiation is achieved by an infrared heating device. The two thicker edges of the film are heated by the infrared heating device, effectively compensating for the problem of insufficient heating temperature of the film edges due to height inspection, achieving overall uniform heating of the film, and improving the overall uniformity of film heating by the drying system. Among them, a temperature sensor and a power regulator are also provided in the infrared heating device. The temperature sensor is used to monitor the film temperature at the drying outlet in real time, and the power regulator is used to fine-tune the heating temperature of the infrared heating unit based on the monitored temperature, thereby improving the temperature consistency of the film.

[0042] See also Figure 2The lower end of each column 212 in the infrared heating device is provided with a connecting piece 213, and the column 212 is sleeved on the outside of the adjacent support beam B through the connecting piece 213, wherein the connecting piece 213 mainly consists of an upper connecting piece 2131, a lower connecting piece 2132 and two connecting bolts 2133. The lower end of the upper connecting piece 2131 is open, and a first locking plate extending vertically outward is provided at the lower ends of both sides of the upper connecting piece 2131. The upper end of the lower connecting piece 2132 is open and is arranged opposite to the upper connecting piece 2131, forming a sleeve with the upper connecting piece 2131, and the shape of the sleeve corresponds to the support beam B. A second locking plate extending vertically outward is provided at the upper ends of both sides of the lower connecting piece 2132. The two connecting bolts 2133 are respectively located on both sides of the upper connecting piece 2131, and pass through the first locking plate and the second locking plate in sequence to lock the upper connecting piece 2131 and the lower connecting piece 2132.

[0043] Through the arrangement of the above-mentioned connecting parts, the sleeve formed by the upper connecting part and the lower connecting part is sleeved on the outside of the support beam B, and is locked with two connecting bolts to fix the position, which is convenient for connection operation. When in use, the connecting part can be moved along the support beam B as needed, so that the infrared heating device as a whole can be moved along the axial direction of the temperature-controlled drying roller. After moving to a suitable position, the position is locked by tightening the connecting bolts, which does not affect the uniformity of the film wind field and is flexible to disassemble.

[0044] In order to further improve the firmness of the connection and locking between the upper connecting member and the lower connecting member, as an improvement to the technical solution, a gasket 213 is also provided in the connecting member. The gasket is located between the first locking plate and the second locking plate. When the first locking plate and the second locking plate are locked by the connecting bolts, the two slip on the contact surface.

[0045] See also Figure 2 Preferably, the adjustment seat 22 includes: a plurality of adjustment racks 221, which correspond one-to-one to the infrared heating unit 23, each adjustment rack 221 is a frame structure, and a mounting hole is provided on the adjustment rack 221, and a connecting bolt for connecting to the infrared heating unit 23 is installed in the mounting hole.

[0046] In order to facilitate the height adjustment of the infrared heating unit 23, the mounting hole on the adjustment frame 221 can be designed as a long hole. At this time, the position of the infrared heating unit 23 can be adjusted along the long hole, thereby adjusting the distance between the infrared heating unit 23 and the temperature-controlled drying roller below, that is, the distance from the film.

[0047] See also Figure 2Each infrared heating unit 23 is composed of a shell 231 and a plurality of infrared heating tubes 232, wherein the shell 231 is arc-shaped, and the plurality of infrared heating tubes 232 are located in the shell 231 and are evenly spaced along the circumference of the shell 231. Each infrared heating tube 232 is parallel to the roller axis of the temperature-controlled drying roller below, and both ends are connected to the shell 231.

[0048] This embodiment provides a method for drying a microporous membrane using the above-mentioned drying system. The drying method is specifically as follows:

[0049] The hot air circulation system is turned on in the drying and insulation chamber. After the hot air circulation, the film is transported and dried by the temperature-controlled drying roller, and both ends of the film are dried by thermal radiation. Since the efficiency of infrared heating is much greater than that of hot air heating, using infrared heating to heat the film edge alone can improve the overall shrinkage consistency of the film and improve the various performances of the film in subsequent production.

[0050] Other embodiments of the present invention will readily occur to those skilled in the art after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the invention being indicated by the following claims.

[0051] It should be understood that the present invention is not limited to the exact construction described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A drying system for a high-speed thermally induced phase separation microporous membrane, the drying system being disposed in a drying and insulation chamber, wherein two wall panels (A) are spaced apart in the drying and insulation chamber, and a plurality of support beams (B) are disposed between the two wall panels (A), wherein both ends of each support beam (B) are fixedly connected to the two wall panels (A), respectively. The drying system comprises: a plurality of temperature-controlled drying rollers (1), a plurality of infrared heating devices (2) and a circulating hot air system; The plurality of temperature-controlled drying rollers (1) are all located between the support beams (B), and are spaced and arranged in parallel relative to the support beams (B). Both ends of each temperature-controlled drying roller (1) are respectively connected to the two wall panels (A). The plurality of infrared heating devices (2) are respectively arranged across the two ends of the plurality of temperature-controlled drying rollers (1), and each of the infrared heating devices (2) comprises: a bracket (21), an adjustment seat (22), a plurality of infrared heating units (23), a temperature sensor, and a power regulator; The bracket (21) is in a door-like shape and is composed of a crossbeam (211) and two upright posts (212). The lower end of each upright post (212) is connected to an adjacent support beam (B), and the upper end of each upright post (212) is fixedly connected to both ends of the crossbeam (211). The adjustment seat (22) is located below the crossbeam (211), and the upper end of the adjustment seat (22) is fixedly connected to the lower surface of the crossbeam (211); The infrared heating units (23) correspond to the temperature-controlled drying rollers (1) one by one, and each infrared heating unit (23) is located outside the corresponding temperature-controlled drying roller (1) and is connected to the adjustment seat (22); The temperature sensor is used for real-time detection of the film temperature at the outlet; The input end of the power regulator is connected to the output end of the temperature sensor, and the output end of the power regulator is connected to the control end of each infrared heating unit (23) to control and adjust the heating power; The circulating hot air system is located in the drying and insulation chamber and is used to provide hot air circulation for the drying and insulation chamber.

2. The drying system for the high-speed thermally induced phase separation microporous membrane according to claim 1, characterized in that: A connecting piece (213) is provided at the lower end of each column (212), and the column (212) is sleeved on the outside of the adjacent support beam (B) through the connecting piece (213); The connecting member (213) comprises: an upper connecting member (2131), a lower connecting member (2132) and two connecting bolts (2133); The lower end of the upper connecting member (2131) is open, and a first locking plate extending vertically outward is provided at the lower ends of both sides of the upper connecting member (2131); The upper end of the lower connecting member (2132) is open, and is arranged opposite to the upper connecting member (2131), forming a sleeve with the upper connecting member (2131), and the shape corresponds to the support beam (B), and a second locking plate extending vertically outward is provided on the upper ends of both sides of the lower connecting member (2132); The two connecting bolts (2133) are respectively located on both sides of the upper connecting member (2131), and pass through the first locking plate and the second locking plate in sequence to lock the upper connecting member (2131) and the lower connecting member (2132).

3. The drying system for the high-speed thermally induced phase separation microporous membrane according to claim 2, characterized in that: The connecting member (213) further includes: a gasket; The gasket is located between the first locking plate and the second locking plate.

4. The drying system for the high-speed thermally induced phase separation microporous membrane according to claim 1, characterized in that: The adjustment seat (22) includes a plurality of adjustment racks (221); The adjustment frames (221) correspond to the infrared heating units (23) one by one, and each adjustment frame (221) is a frame structure. A mounting hole is provided on the adjustment frame (221), and a connecting bolt for connecting with the infrared heating unit (23) is installed in the mounting hole.

5. The drying system for the high-speed thermally induced phase separation microporous membrane according to claim 4, characterized in that: The mounting hole on the adjustment frame (221) is a long hole.

6. The drying system for the high-speed thermally induced phase separation microporous membrane according to claim 1, characterized in that: Each of the infrared heating units (23) comprises: a housing (231) and a plurality of infrared heating tubes (232); The housing (231) is arc-shaped; The plurality of infrared heating tubes (232) are all located in the shell (231) and are evenly spaced along the circumference of the shell (231), and both ends of each infrared heating tube (232) are connected to the shell (231).

7. A method for drying a microporous membrane using a high-speed thermally induced phase separation method, the method being applicable to any one of the drying systems of claims 1 to 6, characterized in that: The drying method is specifically: The hot air circulation system is turned on in the drying and insulation chamber. After the hot air circulation, the film is transported and dried by the temperature-controlled drying roller, and both ends of the film are heated and dried by heat radiation.

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