Tape casting device for water-soluble film

Abstract

The utility model provides a tape casting device for a water-soluble film. The tape casting device comprises a workbench, a discharging mechanism arranged at the first end of the workbench, a scraper installed below the discharging mechanism, a winding mechanism arranged at the second end of the workbench and a drying unit connected to the workbench. The workbench comprises a base band, a transmission mechanism and supporting frames installed on the two sides of the base band, a set of parallel guide rails are arranged on the two sides of each supporting frame in the moving direction of the base band, and the drying unit comprises a drying mechanism installed on the top of the base band and a far infrared heating mechanism arranged at the bottom of the base band. And the far infrared heating mechanism is connected with the parallel guide rails in a sliding manner. According to the tape casting device, the far infrared heating mechanism is in sliding connection with the parallel guide rails on the two sides of the workbench supporting frame, the problems that in a traditional hot air circulation drying method, the air speed is difficult to control, and the drying efficiency is low are solved, the production efficiency is improved, and the maintenance cost is reduced.

Description

Technical Field

[0001] This application relates to the field of casting equipment technology, specifically to a casting equipment for water-soluble films. Background Technology

[0002] Water-soluble films, such as those made primarily of polyvinyl alcohol (PVOH), are widely used in food packaging, agriculture, and disposable consumer goods due to their environmentally friendly and biodegradable properties. Their production typically employs a casting process, where a water-soluble adhesive is coated onto a metal strip, dried, and then peeled off to form a film. The key to successful casting is ensuring uniform film thickness, good flatness, and efficient drying. Traditional drying methods usually rely on hot air circulation, but the cast layer requires high airflow. High airflow or uneven hot air circulation can cause surface disturbance and banded defects, while low airflow leads to low drying efficiency.

[0003] To improve the drying efficiency and quality of films, existing technologies have proposed several auxiliary drying solutions, such as adding positive or negative pressure blowing or suction devices at the raw material extrusion port, or installing heating devices under the metal strip. However, existing heating devices under the steel strip (such as resistance wires or heating plates) typically employ a fixed installation structure, which not only involves complex assembly and disassembly processes but may also cause deformation of the steel strip due to localized overheating or temperature gradients, further affecting the film casting quality, resulting in low production efficiency and high maintenance costs. Utility Model Content

[0004] The purpose of this invention is to provide a casting device for water-soluble films, which can solve the problems of difficult wind speed control and low drying efficiency in traditional hot air circulation drying methods, thereby improving production efficiency and reducing maintenance costs.

[0005] This application is achieved through the following technical solution, specifically:

[0006] A casting apparatus for a water-soluble film includes: a worktable, a feeding mechanism disposed at a first end of the worktable, a scraper installed below the feeding mechanism, a winding mechanism disposed at a second end of the worktable, and a drying unit connected to the worktable.

[0007] The workbench includes a base belt, a transmission mechanism, and support frames installed on both sides of the base belt. A set of parallel guide rails is provided on both sides of the support frames along the movement direction of the base belt. The drying unit includes a drying mechanism installed on the top of the base belt and a far-infrared heating mechanism disposed at the bottom of the base belt. The far-infrared heating mechanism is slidably connected to the parallel guide rails.

[0008] In this solution, a far-infrared heating mechanism slidably connected to a parallel guide rail is added to the bottom of the base belt on the workbench. Working in conjunction with the top drying mechanism, a composite drying method combining top hot air and bottom far-infrared radiation is formed, which significantly improves drying efficiency. Compared with the fixed bottom heating device in the prior art, the far-infrared heating mechanism, through its slidable connection with the parallel guide rail, achieves flexible positioning and movement along the direction of base belt movement. This not only simplifies the installation, disassembly, and maintenance of the heating unit, but also allows for precise adjustment of the far-infrared heating area according to the drying process and needs of the cast liquid, enabling staged or localized heating of the film. This effectively reduces the risk of base belt deformation caused by localized overheating or uneven heating, thereby ensuring the thickness uniformity and flatness of the cast film.

[0009] As an improvement to the far-infrared heating mechanism in this application, the far-infrared heating mechanism includes a slider installed in the parallel guide rail, a support rod connected to the bottom of the slider, and an infrared heating tube connected to the support rod.

[0010] Furthermore, the sliders at corresponding positions on the parallel guide rail are connected by a connecting rod parallel to the baseband.

[0011] Furthermore, a threaded hole is provided on the outer side of the slider, and a fastener for abutting against the parallel guide rail is provided in the threaded hole.

[0012] As an improvement to the support rod in this application, the support rod includes a base connected to the bottom of the slider and a T-shaped rod slidably connected to the base. The T-shaped rod has a threaded hole at one end near the infrared heating tube, and a wing nut for pressing against the infrared heating tube is provided in the threaded hole.

[0013] Furthermore, the base has openings of different heights on its inner side, and one end of the T-shaped rod that is slidably connected to the base is provided with a spring block that matches the opening.

[0014] Furthermore, the base is provided with a fastening screw at the end near the infrared heating tube for securing the T-shaped rod.

[0015] The beneficial effects of this application are as follows:

[0016] The solution proposed in this application adds a far-infrared heating mechanism that slides along a parallel guide rail to the bottom of the baseband on the workbench. This mechanism works in conjunction with the drying mechanism at the top to form a composite drying method that combines hot air from the top with far-infrared radiation from the bottom, thereby significantly improving drying efficiency. Compared to the fixed bottom heating device in the prior art, the far-infrared heating mechanism, by sliding along the parallel guide rail, allows for flexible positioning and movement along the direction of baseband movement. This not only simplifies the installation, disassembly, and maintenance of the heating unit but also allows for precise adjustment of the far-infrared heating area according to the drying progress and needs of the cast liquid. This enables staged or localized heating of the film, effectively reducing the risk of baseband deformation caused by localized overheating or uneven heating, and thus ensuring the uniformity of the cast film's thickness and flatness.

[0017] In addition to the technical problems solved by this utility model, the technical features constituting the technical solution, and the advantages brought about by the technical features of these technical solutions as described above, other technical problems that this utility model can solve, other technical features contained in the technical solution, and the advantages brought about by these technical features will be further explained in detail with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a casting apparatus for a water-soluble film according to an embodiment of this application;

[0019] Figure 2 This is a partial cross-sectional structural schematic diagram of the far-infrared heating mechanism in the embodiments of this application.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1. Workbench; 2. Feeding mechanism; 3. Scraper; 4. Winding mechanism; 5. Drying unit; 11. Base belt; 12. Transmission mechanism; 13. Support frame; 14. Parallel guide rail; 51. Drying mechanism; 52. Far-infrared heating mechanism; 521. Slider; 522. Support rod; 523. Infrared heating tube; 6. Connecting rod; 141. Fastener; 524. Base; 525. T-shaped rod; 526. Wing nut; 527. Opening; 528. Spring block. Detailed Implementation

[0022] The following will be combined with the appendix Figures 1-2 The embodiments of the technical solution of this application are described in detail below. The following embodiments are only used to more clearly illustrate the technical solution of this application, and are therefore merely examples and should not be used to limit the scope of protection of this application. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0023] In view of the problems existing in the background technology or products, Figure 1 This paper shows a schematic diagram of the structure of a casting apparatus for a water-soluble film according to an embodiment of this application. Figure 2 A partial cross-sectional structural schematic diagram of the far-infrared heating mechanism is shown. (See attached diagram.) Figure 1 and 2 As shown, this application provides a casting forming apparatus for a water-soluble film, including: a worktable 1, a feeding mechanism 2 disposed at a first end of the worktable 1, a scraper 3 installed below the feeding mechanism 2, a winding mechanism 4 disposed at a second end of the worktable 1, and a drying unit 5 connected to the worktable 1; the worktable 1 includes a base belt 11, a transmission mechanism 12, and support frames 13 installed on both sides of the base belt 11, and a set of parallel guide rails 14 are provided on both sides of the support frame 13 along the movement direction of the base belt 11; the drying unit 5 includes a drying mechanism 51 installed on the top of the base belt 11 and a far-infrared heating mechanism 52 disposed on the bottom of the base belt 11, and the far-infrared heating mechanism 52 is slidably connected to the parallel guide rails 14.

[0024] Specifically, the worktable 1 serves as the main support structure of the casting molding device. At its first end, a feeding mechanism 2 is provided to quantitatively and uniformly apply water-soluble adhesive to the base belt 11 of the worktable 1. Below the feeding mechanism 2, a scraper 3 is installed to precisely control the thickness of the adhesive applied to the base belt 11, ensuring the uniformity of the final film thickness. At the second end of the worktable 1, a winding mechanism 4 is provided to peel the dried and formed water-soluble film from the base belt 11 and wind it up for collection. Simultaneously, a drying unit 5 connected to the worktable 1 is used to dry and cure the adhesive applied to the base belt 11, accelerating the evaporation of the solvent.

[0025] The workbench 1 specifically includes a base belt 11 that carries and conveys the adhesive liquid, typically a smooth and flat metal belt or polymer material belt, providing a casting surface; a transmission mechanism 12 connected to the base belt 11, such as a motor, reducer, roller, etc., drives the base belt 11 to move at a stable speed along a preset direction to achieve continuous production. Support frames 13 installed on both sides of the base belt 11 are used to support the base belt 11 and its auxiliary components (such as rollers) and maintain their tension and stable operation. A set of parallel guide rails 14 are arranged on both sides of the support frame 13 along the movement direction of the base belt 11. These guide rails are parallel to the movement trajectory of the base belt 11 and provide linear guidance and support for the far-infrared heating mechanism 52 at the bottom. The drying unit 5 is a key component for achieving film drying. It includes a drying mechanism 51 installed on the top of the base belt 11, which can use hot air circulation, top infrared radiation, or other top heating methods to heat the film from the top via convection or radiation, accelerating the evaporation of surface moisture. The far-infrared heating mechanism 52 located at the bottom of the base belt 11 utilizes the strong penetrating power of far-infrared rays to penetrate the base belt 11 and directly act on the adhesive layer thereon. It heats the interior and bottom of the adhesive layer through molecular vibration, thereby achieving efficient volumetric heating. Compared to traditional fixed bottom heating, the far-infrared heating mechanism 52, through its sliding connection with the parallel guide rail 14, makes installation, disassembly, maintenance, and cleaning extremely simple, greatly reducing maintenance difficulty and cost. More importantly, by controlling its position on the parallel guide rail 14, the heating area and intensity distribution can be precisely adjusted according to the drying characteristics of the casting liquid at different stages (e.g., lower temperature is needed in the early stage to prevent skin formation, enhanced drying is needed in the middle stage, and slow cooling is needed in the later stage). This allows for targeted, staged, or localized heating of the film. This adjustable heating distribution helps optimize the temperature curve of the entire drying process, effectively controls the drying rate and temperature gradient, and reduces deformation (such as warping or bulging) that may be caused by uneven heating or overheating of the baseband. This, in turn, ensures the uniformity of film thickness and surface flatness during the casting process, improving the quality and production stability of the finished film.

[0026] In one implementation, the far-infrared heating mechanism 52 includes a slider 521 installed in the parallel guide rail 14, a support rod 522 connected to the bottom of the slider 521, and an infrared heating tube 523 connected to the support rod 522.

[0027] Specifically, the slider 521, as a load-bearing component, transfers the weight of the far-infrared heating mechanism 52 to the parallel guide rail 14 on the support frame 13, and guides the far-infrared heating mechanism 52 to slide smoothly and reliably along the movement direction of the baseband 11 through precise cooperation with the parallel guide rail 14, thereby providing a mechanical basis for adjusting the position of the heating area.

[0028] Preferably, the sliders 521 at corresponding positions on the parallel guide rail 14 are connected by a connecting rod 6 parallel to the baseband 11. This connecting rod 6 connects two sliders 521 positioned longitudinally on the parallel guide rail 14 on both sides of the baseband 11. This connection method ensures that the support structures of the far-infrared heating mechanisms 52 located on both sides of the baseband 11 can slide synchronously and coordinately on the parallel guide rail 14, preventing asynchronous movement or skewness of the sliding units on both sides, which could lead to differences in drying in the film width direction, thermal stress concentration, and the risk of localized deformation of the baseband 11.

[0029] Preferably, the slider 521 has a threaded hole on its outer side, and a fastener 141 for abutting against the parallel guide rail 14 is provided in the threaded hole. The fastener 141 is usually a screw or other type of adjustable fastener. By screwing it into the threaded hole on the outer side of the slider 521, its end can extend radially inward and abut against or clamp the side or top of the parallel guide rail 14, thereby fixing the position of the slider 521 on the parallel guide rail 14 in a convenient and reliable manner. When it is necessary to adjust the longitudinal position of the far-infrared heating mechanism 52, the fastener 141 can be loosened, allowing the slider 521 to slide along the guide rail to the target position. Then, the fastener 141 can be tightened again. Through the abutting action of the fastener 141, the slider 521 is firmly locked in the current position, preventing it from moving accidentally due to vibration or inertial force during use, thereby ensuring the stability of the drying process and the forming quality of the film.

[0030] In one implementation, the support rod 522 includes a base 524 connected to the bottom of the slider 521 and a T-shaped rod 525 slidably connected to the base 524. The T-shaped rod 525 has a threaded hole at one end near the infrared heating tube 523, and a wing nut 526 for pressing against the infrared heating tube 523 is provided in the threaded hole.

[0031] Specifically, the sliding connection structure allows the T-shaped rod 525 to slide up and down relative to the base 524 (and slider 521) within a certain range in a direction perpendicular to the plane of the base strip 11, thereby changing the vertical distance between the infrared heating tube 523 and the base strip 11 and the adhesive above it. For example, the height can be adjusted to meet the drying requirements of adhesives with different thicknesses or formulations, or the heating distance can be dynamically adjusted at different stages of the drying process to improve drying efficiency and film quality. The end of the T-shaped rod 525 away from the base 524 (i.e., the end closer to the infrared heating tube 523) has a threaded hole for fixing the infrared heating tube 523. The wing nut 526 is set in the threaded hole. By manually tightening or loosening the wing nut 526, the infrared heating tube 523 fixed on the T-shaped rod 525 can be easily locked or released, realizing the quick installation, disassembly, or fine adjustment of the position of the infrared heating tube 523 in the horizontal plane.

[0032] Optionally, the base 524 has openings 527 at different heights on its side, and the T-shaped rod 525 is slidably connected to one end of the base 524 with a spring block 528 matching the opening 527. This embodiment provides a structure for convenient and quick vertical positioning adjustment of the T-shaped rod 525; the side wall of the base 524 has multiple mutually spaced openings 527 at different heights along the vertical direction, which are preset positioning points; the T-shaped rod 525 is slidably connected to the inside of the base 524, and a spring block 528 is provided at its end near the base 524. This spring block 528 is usually pushed by a spring, so that part of it protrudes from the side of the T-shaped rod 525; when the T-shaped rod 525 slides inside the base 524, the spring block 528 will move accordingly. Once the spring block 528 is in contact with the side of the base 524... When any opening 527 on the wall is aligned, the spring block 528 will automatically pop out and lock into the opening 527 under the action of spring force, thereby locking the T-shaped rod 525 at that height position. By pulling the spring block 528 to disengage it from the opening 527, the lock can be released and the rod can be adjusted up and down. By selecting different openings 527, the T-shaped rod 525 can be locked at different height positions, so that the infrared heating tube 523 can be quickly and accurately positioned to multiple preset different heights. This simplifies the operation, improves the efficiency and repeatability of height adjustment, and is suitable for scenarios that require rapid switching of heating distance according to different process requirements or material characteristics.

[0033] Optionally, the base 524 is provided with a fastening screw for abutting the T-shaped rod 525 at one end near the infrared heating tube 523. This embodiment provides another structure for locking the sliding position of the T-shaped rod 525; the base 524 has a threaded hole on the side wall of the part that slides with the T-shaped rod 525, for example, near the protruding end of the infrared heating tube 523, and a fastening screw is screwed in; the end of the fastening screw faces the side surface of the T-shaped rod 525; when it is necessary to lock the position of the T-shaped rod 525, by tightening the fastening screw, its end will press against or abut against the side surface of the T-shaped rod 525, generating sufficient friction to firmly fix the T-shaped rod 525 in the current sliding position in the base 524, preventing it from moving due to vibration or external force during use; by loosening the fastening screw, the locking of the T-shaped rod 525 can be released, allowing it to slide freely in the base 524, thereby realizing continuous and fine adjustment of the height of the infrared heating tube 523; this embodiment provides greater adjustment flexibility, allowing the infrared heating tube 523 to be positioned at any height within the sliding range, which is suitable for complex process requirements that require fine adjustment of the heating distance to optimize the drying effect.

[0034] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "set", "equipped with", "connected", and "installed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A casting apparatus for water-soluble films, comprising: Workbench (1), feeding mechanism (2) set at the first end of the workbench (1), scraper (3) installed below the feeding mechanism (2), winding mechanism (4) set at the second end of the workbench (1) and drying unit (5) connected to the workbench (1); The workbench (1) is characterized in that it includes a base belt (11), a transmission mechanism (12) and a support frame (13) installed on both sides of the base belt (11). A set of parallel guide rails (14) are provided on both sides of the support frame (13) along the movement direction of the base belt (11). The drying unit (5) includes a drying mechanism (51) installed on the top of the base belt (11) and a far-infrared heating mechanism (52) set at the bottom of the base belt (11). The far-infrared heating mechanism (52) is slidably connected to the parallel guide rails (14).

2. The casting apparatus as described in claim 1, characterized in that, The far-infrared heating mechanism (52) includes a slider (521) installed in the parallel guide rail (14), a support rod (522) connected to the bottom of the slider (521), and an infrared heating tube (523) connected to the support rod (522).

3. The casting apparatus as described in claim 2, characterized in that, The sliders (521) at corresponding positions on the parallel guide rail (14) are connected by a connecting rod (6) that is parallel to the baseband (11).

4. The casting apparatus as described in claim 2, characterized in that, The slider (521) has a threaded hole on its outer side, and a fastener (141) for abutting against the parallel guide rail (14) is provided in the threaded hole.

5. The casting apparatus as described in claim 2, characterized in that, The support rod (522) includes a base (524) connected to the bottom of the slider (521) and a T-shaped rod (525) slidably connected to the base (524). The T-shaped rod (525) has a threaded hole at one end near the infrared heating tube (523), and a wing nut (526) for pressing against the infrared heating tube (523) is provided in the threaded hole.

6. The casting apparatus as described in claim 5, characterized in that, The base (524) has openings (527) of different heights on its inner side. The T-shaped rod (525) is slidably connected to one end of the base (524) and has a spring block (528) that matches the opening (527).

7. The casting apparatus as described in claim 5, characterized in that, The base (524) is provided with a fastening screw for abutting the T-shaped rod (525) at one end near the infrared heating tube (523).

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