A polyimide casting die device

Abstract

The present invention provides a die head device for polyimide casting, comprising: a housing, a scraper, a coating base belt, and a cleaning mechanism. The coating base belt is arranged inside the housing, and a feeding device is provided above the coating base belt, the feeding device being used to provide the coating base belt with a mixed slurry; the scraper is arranged above the coating base belt, comprising a connecting portion and a blade portion, the blade portion being provided at the bottom of the connecting portion, and a coating gap being formed between the blade portion and the coating base belt; the cleaning mechanism is provided above the scraper, comprising: a support frame, a base, and a cleaning blade, the support frame being provided with a guide rail, the base being slidably provided on the guide rail, the top end of the cleaning blade being connected to the base, and the cleaning blade being in contact with the side wall of the connecting portion near the feeding mechanism. The polyimide casting die head device described in the present invention can prevent the slurry from accumulating and solidifying on the scraper.

Description

Technical Field

[0001] The invention belongs to the field of film production equipment, in particular to a die head device for polyimide casting. Background Art

[0002] The casting machine is a special equipment for producing polyimide cast film. When working, the mixed slurry will enter the casting device through the feeding device and be coated on the special base belt with a preset thickness by the scraper. The coated slurry will form a film blank after the solidification and cooling process. The staff will cut, laminate and other processing methods on the blank according to actual needs to obtain the finished film.

[0003] Because the mixed slurry typically has a high viscosity, a large amount of slurry adheres to the scraper during slurry coating. As the casting process continues, the slurry attached to the scraper gradually solidifies. The solidified slurry damages the surface of the scraper coating, thus affecting the smoothness of the cast film surface. Furthermore, because the solidified slurry is difficult to separate from the scraper, workers cannot quickly and effectively remove the residual slurry on the scraper during downtime for maintenance. Therefore, slurry adhesion can prolong the downtime of the casting die for maintenance, reducing the production efficiency of polyimide film. Summary of the Invention

[0004] In view of this, the present invention aims to provide a polyimide casting die head device to achieve the purpose of preventing the slurry from accumulating and solidifying on the scraper.

[0005] To achieve the above object, the technical solution created by the present invention is implemented as follows:

[0006] A die head device for polyimide casting comprises: a box body, a scraper, a coating base belt and a cleaning mechanism, wherein the coating base belt is arranged inside the box body, and a feeding device is provided above the coating base belt, and the feeding device is used to provide mixed slurry to the coating base belt; the scraper is arranged above the coating base belt, and comprises a connecting portion and a blade portion, and the blade portion is arranged at the bottom of the connecting portion, and a coating gap is formed between the blade portion and the coating base belt; the cleaning mechanism is arranged above the scraper, and comprises: a support frame, a base and a cleaning knife, the support frame is provided with a guide rail, and the base is slidably arranged on the guide rail, the top end of the cleaning knife is connected to the base, and the cleaning knife is in contact with the side wall of the connecting portion close to the feeding device.

[0007] Furthermore, a receiving groove is provided on the top of the connecting section, and a heating component is provided inside the receiving groove. The heating component is used to increase the temperature of the scraper to prevent the slurry from solidifying on the scraper. A heating chamber is provided inside the heating component. The heating chamber is connected to the air outlet of the hot air blower through an air inlet pipe, and is connected to the air inlet of the hot air blower through an air outlet pipe.

[0008] Furthermore, a heat-conducting groove is provided on the side wall of the heating component, and correspondingly, a heat-conducting protrusion is provided on the inner wall of the accommodating groove, and the heat-conducting protrusion is placed inside the heat-conducting groove.

[0009] Furthermore, a limiting groove is provided on the top of the heating component, and correspondingly, a limiting bar is provided on the bottom of the support frame, and the limiting bar is placed inside the limiting groove.

[0010] Furthermore, the air inlet pipe and the air outlet pipe are inserted into the heating cavity along the same side of the heating component, and the length of the air inlet pipe inserted into the heating cavity is greater than the length of the air outlet pipe inserted into the heating cavity.

[0011] Furthermore, the cleaning mechanism includes an operating rod, which is parallel to the guide rail, one end of the operating rod is connected to the base, and the other end passes through the side wall of the box and is connected to the handle.

[0012] Furthermore, the cleaning mechanism includes a reset spring, which is sleeved on the outside of the operating rod. One end of the reset spring is connected to the base, and the other end is connected to the side wall of the support frame close to the handle.

[0013] Furthermore, a collecting tray is provided at the bottom of the cleaning knife, and correspondingly, a cleaning port is provided on the side wall of the box body, and the cleaning port is aligned with the collecting tray.

[0014] Compared with the prior art, the polyimide casting die device created by the present invention has the following advantages:

[0015] (1) The present invention provides a polyimide casting die head device that can clean the sidewalls of a scraper blade through a cleaning mechanism. This cleaning process prevents slurry from adhering to and accumulating on the scraper blade, thereby preventing the slurry from solidifying and residing on the scraper blade surface. Compared to the prior art, the present device can reduce the difficulty of cleaning the scraper blade of the casting die head and prevent the polyimide film from being affected by solidified slurry on the scraper blade surface during the casting coating process.

[0016] (2) The present invention creates a polyimide casting die head device, which is provided with a heating component inside the scraper. The heating component can increase the temperature of the scraper and reduce the solidification speed of the attached slurry, thereby facilitating the cleaning mechanism to clean the scraper surface and improving the cleaning efficiency of the device.

[0017] (3) The present invention creates a polyimide casting die head device, which is provided with a collecting tray at the bottom of the cleaning knife. The collecting tray can collect the fallen slurry to prevent the solidified slurry debris from entering the interior of the cast film. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 A schematic structural diagram of the die head device according to an embodiment of the present invention;

[0020] Figure 2 A cross-sectional view of the die head device according to an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of the structure of the scraper, heating assembly and cleaning mechanism according to an embodiment of the present invention;

[0022] Figure 4 A cross-sectional view of the scraper, heating assembly, and cleaning mechanism according to an embodiment of the present invention;

[0023] Figure 5 A schematic structural diagram of a scraper according to an embodiment of the present invention;

[0024] Figure 6 A schematic structural diagram of a heating assembly according to an embodiment of the present invention;

[0025] Figure 7 A schematic structural diagram of the support frame according to an embodiment of the present invention;

[0026] Figure 8 This is a schematic structural diagram of the base and cleaning knife described in an embodiment of the present invention.

[0027] Description of reference numerals:

[0028] 1-box; 11-feeding device; 12-coating base tape; 13-cleaning port; 2-scraper; 21-connecting part; 211-accommodating groove; 212-heat-conducting protrusion; 22-blade; 31-support frame; 311-guide rail; 312-limiting strip; 32-base; 33-cleaning knife; 331-collecting tray; 34-operating lever; 314-handle; 35-reset spring; 4-heating component; 41-heating chamber; 42-air inlet pipe; 43-air outlet pipe; 44-heat-conducting cutting groove; 45-limiting groove. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0030] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second" and the like are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, features defined as "first", "second" and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0031] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art can understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0033] A polyimide casting die device, the structure of which can be Figure 1 and Figure 2 For illustration, as shown in the figure, the die head device includes: a box 1, a scraper 2, a coating base belt 12 and a cleaning mechanism.

[0034] The coating base belt 12 is arranged inside the box 1, and a feeding device 11 is provided above the coating base belt 12. The scraper 2 is arranged above the coating base belt 12, and includes a connecting portion 21 and a blade portion 22. The blade portion 22 is arranged at the bottom of the connecting portion 21, and a coating gap is formed between the blade portion 22 and the coating base belt 12.

[0035] During operation, the worker can squeeze the mixed slurry into a sheet through the feeding device 11, and cast the sheet slurry on the surface of the coating base belt 12. When the slurry passes through the coating gap, the scraper 2 will scrape and press the slurry so that the slurry is coated on the coating base belt 12 with a preset thickness.

[0036] Due to the high viscosity of the casting slurry, when the scraper 2 is scraping and pressing the slurry, part of the slurry will adhere to the side wall of the scraper 2. As the casting work continues, the slurry attached to the scraper 2 will climb upward along the scraper 2 and solidify on the surface of the scraper 2 due to the decrease in temperature. The solidified slurry will destroy the original shape of the scraper 2, causing defects in the film coated on the base band. In the prior art, the cleaning method of the scraper 2 is relatively primitive. The staff needs to remove the solidified slurry on the surface of the scraper 2 after the casting die is shut down. However, since the curing cycle of the residual slurry on the scraper 2 cannot be estimated, the existing cleaning method cannot avoid defects in the film. In addition, since the slurry will have a higher strength after solidification, it is difficult to improve the efficiency of the staff in stopping work to clean it. This will extend the shutdown time of the casting die and reduce the production efficiency of the casting film.

[0037] In order to prevent the slurry from being accumulated and solidified on the scraper 2, the casting die head of this embodiment includes a cleaning mechanism, which is arranged above the scraper 2. The structure of the cleaning mechanism can be made by Figure 4 As shown in the figure, the cleaning mechanism includes: a support frame 31, a base 32, and a cleaning blade 33. The support frame 31 is provided with a guide rail 311, the base 32 is slidably mounted on the guide rail 311, the top end of the cleaning blade 33 is connected to the base 32, and the cleaning blade 33 is in contact with the side wall of the connecting portion 21 near the feeding device 11.

[0038] Because the cleaning blade 33 is in contact with the sidewall of the connecting portion 21 near the feeding device 11, when the base 32 slides along the guide rail 311, the cleaning blade 33 can clean the sidewall of the connecting portion 21. Specifically, in the initial state, the base 32 is located at one end of the guide rail 311, and the cleaning blade 33 is located outside the scraper 2. When the scraper 2 needs to be cleaned, the staff can drive the base 32 to slide toward the other end of the guide rail 311. At this time, the cleaning blade 33 will completely cut across the sidewall of the connecting portion 21 and use the blade of the cleaning blade 33 to clean the slurry attached to the connecting portion 21. This cleaning process can promptly remove residual slurry adhering to the surface of the scraper 2, avoiding film damage caused by solidified residue on the scraper 2.

[0039] Optionally, to prevent the slurry from falling off from entering the cast film, a collecting tray 331 is provided at the bottom of the cleaning blade 33. Accordingly, a cleaning port 13 is provided on the side wall of the box body 1, and the cleaning port 13 is aligned with the collecting tray 331. After completing the cleaning work, the staff can clean the slurry inside the collecting tray 331 through the cleaning port 13 to prevent the slurry from entering the cast film and damaging the quality of the film.

[0040] Furthermore, considering that the curing cycle of the slurry on the surface of the scraper 2 cannot be predicted, the cleaning interval should be shortened. For example, during film casting, the scraper 2 can be cleaned every 5-10 minutes to separate the slurry attached to the scraper 2 before it cures.

[0041] Optionally, in order to facilitate the staff to control the position of the base 32, such as Figure 8 As shown, the cleaning mechanism includes an operating rod 34, which is parallel to the guide rail 311. One end of the operating rod 34 is connected to the base 32, and the other end passes through the side wall of the box body 1 and is connected to the handle 314. During operation, the operator can pull the handle 314 to drive the base 32 to slide on the guide rail 311, thereby starting the cleaning work of the scraper 2 in time.

[0042] In addition, to reduce the workload of the staff, the cleaning mechanism also includes a return spring 35. Specifically, the return spring 35 is mounted on the outside of the operating rod 34. One end of the return spring 35 is connected to the base 32, and the other end is connected to the side wall of the support frame 31 near the handle 314. During cleaning, the movement of the base 32 causes elastic potential energy to accumulate inside the return spring 35. When the cleaning work is completed, the elastic potential energy inside the return spring 35 will drive the base 32 to return to its original position, thereby facilitating the staff's operation.

[0043] Since the solidification speed of the slurry is affected by temperature, the lower the temperature, the faster the slurry solidifies. Therefore, in order to reduce the solidification speed of the slurry attached to the scraper 2 and extend the cleaning cycle of the cleaning mechanism, the casting die described in this embodiment also includes a heating component 4.

[0044] Attachment Figure 5 It is the structural diagram of scraper 2, Figure 6 This is a structural diagram of the heating component 4. As shown in the figure, a receiving groove 211 is provided on the top of the connecting section, a heating component 4 is provided inside the receiving groove 211, and a heating chamber 41 is provided inside the heating component 4. The heating chamber 41 is connected to the air outlet of the hot air blower (not shown in the figure) through an air inlet pipe 42, and is connected to the air inlet of the hot air blower through an air outlet pipe 43.

[0045] During operation, hot air can be delivered to the interior of the heating chamber 41 by a hot air blower. The heat carried by the hot air can increase the temperature of the scraper 2 to prevent the residual slurry from solidifying.

[0046] Optionally, to improve the heat exchange efficiency between the heating component 4 and the scraper 2, a heat-conducting groove 44 is provided on the side wall of the heating component 4, and correspondingly, a heat-conducting protrusion 212 is provided on the inner wall of the receiving groove 211, and the heat-conducting protrusion 212 is placed inside the heat-conducting groove 44. The provision of the heat-conducting protrusion 212 and the heat-conducting groove 44 can increase the contact area between the heating component 4 and the scraper 2, thereby improving the heat exchange effect between the two.

[0047] In addition, in order to increase the residence time of the hot air inside the heating chamber 41 and maximize the utilization of the heat of the hot air, optionally, the air inlet pipe 42 and the air outlet pipe 43 are inserted into the heating chamber 41 along the same side of the heating component 4, and the length of the air inlet pipe 42 inserted into the heating chamber 41 is greater than the length of the air outlet pipe 43 inserted into the heating chamber 41.

[0048] Attachment Figure 7 Figure 3 is a schematic diagram of the structure of the support frame 31 in this embodiment. To improve the connection reliability between the cleaning mechanism and the heating assembly 4, a limiting groove 45 is provided on the top of the heating assembly 4. Correspondingly, a limiting bar 312 is provided on the bottom of the support frame 31. The limiting bar 312 is positioned within the limiting groove 45. The cooperation between the limiting bar 312 and the limiting groove 45 facilitates the installation of the cleaning mechanism. In addition, the limiting effect of the limiting groove 45 prevents the cleaning mechanism from shaking during the cleaning process, thereby improving the cleaning effect.

[0049] The following describes the effects of the above scheme:

[0050] This embodiment provides an easy-to-clean polyimide film casting die head, which can clean the side walls of the scraper through a cleaning mechanism. The cleaning process can prevent the slurry from adhering to and accumulating on the scraper, thereby preventing the slurry from forming solidified residues on the scraper surface. Secondly, the device is provided with a heating component inside the scraper, which can increase the temperature of the scraper and reduce the solidification speed of the attached slurry. Therefore, it is convenient for the cleaning mechanism to clean the scraper surface and improve the cleaning efficiency of the device. In addition, the device is provided with a collection tray at the bottom of the cleaning blade, which can collect the slurry that has fallen off, preventing the solidified slurry debris from entering the cast film.

[0051] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A polyimide casting die device, characterized in that include: A box (1), a scraper (2), a coating base belt (12) and a cleaning mechanism, wherein the coating base belt (12) is arranged inside the box (1), and a feeding device (11) is provided above the coating base belt (12), and the feeding device (11) is used to provide the mixed slurry to the coating base belt (12); the scraper (2) is arranged above the coating base belt (12), and comprises a connecting portion (21) and a blade portion (22), wherein the blade portion (22) is arranged at the bottom of the connecting portion (21), and a space is formed between the blade portion (22) and the coating base belt (12). The coating gap; the cleaning mechanism is arranged above the scraper (2), comprising: a support frame (31), a base (32) and a cleaning knife (33); the support frame (31) is provided with a guide rail (311); the base (32) is slidably arranged on the guide rail (311); the top of the cleaning knife (33) is connected to the base (32), and the cleaning knife (33) is in contact with the side wall of the connecting portion (21) close to the feeding device (11); the top of the connecting portion (21) is provided with a receiving groove (211), and a A heating component (4) is provided, wherein the heating component (4) is used to increase the temperature of the scraper (2) to prevent the slurry from solidifying on the scraper (2). A heating chamber (41) is provided inside the heating component (4). The heating chamber (41) is connected to the air outlet of the hot air blower via an air inlet pipe (42) and is connected to the air inlet of the hot air blower via an air outlet pipe (43). A heat-conducting groove (44) is provided on the side wall of the heating component (4). Accordingly, a heat-conducting protrusion (212) is provided on the inner wall of the receiving groove (211). The heat-conducting protrusion (212) The cleaning mechanism comprises an operating rod (34), the operating rod (34) is parallel to the guide rail (311), one end of the operating rod (34) is connected to the base (32), and the other end passes through the side wall of the box body (1) and is connected to the handle (314); the cleaning mechanism comprises a return spring (35), the return spring (35) is sleeved on the outside of the operating rod (34), one end of the return spring (35) is connected to the base (32), and the other end is connected to the side wall of the support frame (31) near the handle (314).

2. A polyimide casting die device according to claim 1, characterized in that: A limiting groove (45) is provided on the top of the heating component (4), and correspondingly, a limiting strip (312) is provided on the bottom of the support frame (31), and the limiting strip (312) is placed inside the limiting groove (45).

3. The polyimide casting die device according to claim 1, wherein: The air inlet pipe (42) and the air outlet pipe (43) are inserted into the heating chamber (41) along the same side of the heating assembly (4), and the length of the air inlet pipe (42) inserted into the heating chamber (41) is greater than the length of the air outlet pipe (43) inserted into the heating chamber (41).

4. The polyimide casting die device according to claim 1, wherein: A collecting tray (331) is provided at the bottom of the cleaning knife (33), and correspondingly, a cleaning opening (13) is provided on the side wall of the box body (1), and the cleaning opening (13) is aligned with the collecting tray (331).

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