A bellows for thin film production

Abstract

This utility model discloses a bellows for film production, comprising: a box body; an upper anti-stick mesh strip attached to the upper inner wall of the box body; and a lower anti-stick mesh strip attached to the lower inner wall of the box body. The upper and lower anti-stick mesh strips are spaced apart to define a channel for conveying the film, and both are Teflon mesh strips with breathable mesh holes. Both the upper and lower inner walls of the box body are provided with breathable holes, allowing hot air from inside the box to pass sequentially through the breathable holes in the inner wall and the breathable mesh holes in the mesh strips to heat the film within the channel. This utility model, by using Teflon mesh strips on the inner wall of the bellows, utilizes their dual properties of anti-sticking and breathability to ensure smooth flow of hot air while effectively isolating the floating film from direct contact with the inner wall of the bellows, thereby preventing adhesion, significantly improving film product quality, and enhancing production stability.

Description

Technical Field

[0001] This utility model relates to the field of thin film production equipment technology, and in particular to a bellows for thin film production. Background Technology

[0002] In the film production process, stretching is a crucial step, typically completed inside a bellows. The bellows blow hot air through internal vents, providing a uniform heating environment for the film. The film is held by chain clamps on two side tracks and moves along the tracks within the bellows, being stretched laterally as the track spacing increases. Once the film is stretched to a preset size, the track spacing is slightly reduced to adjust internal stress. During this reduction phase, the previously taut film becomes loose. At this point, the continuously blowing hot air inside the bellows causes the loose film to float up and down. Because the inner wall of the bellows is usually made of metal and is at a high temperature, the floating film is highly susceptible to sticking upon contact with this hot surface. This sticking can range from contaminating the film surface to causing it to break instantly, leading to production interruptions, product degradation, and significant equipment cleaning and material waste. In particular, as film production expands to wider widths, the amount of film floating during stretching and retraction also increases, making the sticking problem even more pronounced.

[0003] Therefore, how to effectively prevent the film from sticking to the inner wall of the bellows during the retraction stage has become a technical problem that urgently needs to be solved in this field. Utility Model Content

[0004] The purpose of this invention is to provide a windbox for thin film production, which aims to solve the technical problem in the prior art where the thin film adheres to the high-temperature inner wall of the windbox due to floating hot air during stretching and shrinking.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A bellows for thin film production includes: a box body, the box body having an upper inner wall and a lower inner wall, both the upper inner wall and the lower inner wall having a plurality of ventilation holes; The upper anti-stick mesh strip is attached to the upper inner wall; and The lower anti-stick mesh strip is attached to the lower inner wall; The upper and lower anti-stick mesh belts are spaced apart, forming a channel for conveying the film. Both the upper and lower anti-stick mesh belts are made of Teflon material with breathable mesh holes. Hot air can pass through the breathable holes in the upper and lower inner walls, as well as the breathable mesh holes in the upper and lower anti-stick mesh belts, and finally enter the channel.

[0006] Therefore, by attaching a layer of Teflon anti-stick mesh tape to the upper and lower inner walls of the bellows, and allowing hot air to pass sequentially through the vents on the inner wall and the mesh tape, uniform heating of the membrane is achieved. Furthermore, the excellent anti-stick properties of Teflon ensure that even if the membrane loosens and floats due to the hot air during retraction, it will only contact the surface of the anti-stick mesh tape and will not stick. This solution, through physical isolation, fundamentally avoids direct contact between the membrane and the high-temperature metal inner wall of the bellows, effectively solving the adhesion problem and ensuring production continuity and product quality.

[0007] Optionally, the upper and lower anti-stick mesh strips are detachably attached to the upper and lower inner walls by means of a fixing component.

[0008] Therefore, the use of a detachable fixing method makes the installation, cleaning, and replacement of the anti-stick mesh belt convenient and quick, reducing the difficulty and time cost of equipment maintenance and improving the practicality and maintainability of the equipment.

[0009] Optionally, the fixing components include pressure plates for fixing the perimeter of the upper anti-stick mesh strip and Teflon cable ties for fixing the center of the upper anti-stick mesh strip.

[0010] Therefore, by using pressure plates and cable ties in combination, it is possible to ensure that the upper mesh strip is evenly stressed and firmly installed around its perimeter, while also effectively preventing the middle part from sagging due to gravity or airflow impact, thus ensuring the flatness of the isolation surface.

[0011] Optionally, the fixing assembly includes a magnetic fixing assembly for fixing the lower anti-stick mesh strip; the magnetic fixing assembly includes: a plurality of iron plates fixed to the front end and rear end of the lower anti-stick mesh strip; and a plurality of magnets disposed on the lower inner wall and magnetically attracted to the iron plates.

[0012] Therefore, the magnetic fixing method eliminates the need for destructive operations such as drilling at the bottom of the bellows, making installation and disassembly extremely convenient. It is especially suitable for situations where space is limited and traditional bolt fixing is inconvenient, simplifying the installation process and protecting the original structure of the equipment.

[0013] Optionally, the magnet is mounted on a magnet mounting plate, and the magnet is covered with a stainless steel magnet cover.

[0014] Therefore, the magnet mounting plate facilitates the installation and positioning of the magnet, while the stainless steel cover effectively protects the magnet, preventing it from being damaged or broken under complex working conditions, thus improving the durability and reliability of the mounting components.

[0015] Optionally, the fixing assembly also includes: a front fixing rod and an auxiliary fixing rope; wherein the front fixing rod passes through the sleeve formed by the front edge of the lower anti-stick mesh tape, and the auxiliary fixing rope binds and fixes the front fixing rod to the box body in a cross-shaped manner.

[0016] Therefore, by combining the front fixing rod with the mesh belt in a sleeve-type integrated manner, and then using auxiliary fixing ropes to tie it to the box, a firm, multi-point fixation of the front end of the lower anti-stick mesh belt is achieved. Combined with the magnetic fixation at the rear end, this greatly enhances the overall stability of the fixation and effectively resists the impact of various complex airflows.

[0017] Optionally, the enclosure includes a detachable and dockable upper enclosure and a lower enclosure.

[0018] Therefore, the enclosure is designed with a split upper and lower structure, which facilitates the assembly, transportation, and maintenance of the equipment. Especially when installing or maintaining the internal anti-stick mesh strip, it allows for easier access to the interior space, improving operational convenience.

[0019] Optionally, the pore size of the breathable mesh is 8mm × 8mm.

[0020] Therefore, the 8mm×8mm mesh size is an optimized balance between ensuring sufficient air permeability and preventing localized depressions in the membrane, ensuring that hot air can effectively act on the membrane while providing stable support for the floating membrane.

[0021] Optionally, the thickness of the upper and lower anti-stick mesh strips is 0.8 mm.

[0022] Therefore, this thickness parameter ensures that the mesh strip has sufficient mechanical strength and durability, and can withstand the blowing of hot air and contact with the film for a long time without being easily damaged. Attached Figure Description

[0023] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present invention and, together with their description, serve to explain the principles of the present invention.

[0024] Figure 1 This is a schematic diagram of the overall structure of the upper box in an embodiment of this utility model; Figure 2 yes Figure 1 Enlarged schematic diagrams of parts I, II, and III; Figure 3 This is a schematic diagram of the overall structure of the lower box in an embodiment of this utility model; Figure 4 yes Figure 3 A magnified view of a portion of section IV; Figure 5 yes Figure 3 A magnified view of a portion of the V-shaped section; Figure 6 yes Figure 3 A magnified view of part VI in the middle section.

[0025] Explanation of reference numerals in the attached figures: 11. Upper box; 12. Lower box; 21. Upper anti-stick mesh strip; 22. Lower anti-stick mesh strip; 31. Pressure plate; 32. Bolt; 33. Teflon cable ties; 36. Iron plate; 37. Magnet; 38. Magnet fixing plate; 39. Magnet cover; 40. Auxiliary fixing rope; 41. Front fixing rod. Detailed Implementation

[0026] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present invention.

[0027] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0028] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0029] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0031] Please see Figure 1 and Figure 3 This embodiment provides a bellows for thin film production, the overall structure of which includes a box body. In this embodiment, the box body is preferably a detachable structure, consisting of an upper box body 11 and a lower box body 12 connected by a mating structure, which facilitates installation and maintenance. The box body is provided with an upper air outlet and a lower air outlet (not shown) for blowing hot air onto the thin film.

[0032] The core improvement of this invention lies in the detachable installation of an upper anti-stick mesh strip 21 and a lower anti-stick mesh strip 22 on the upper and lower inner walls of the housing, respectively. These two mesh strips are spaced apart from each other, jointly defining a channel for the membrane to pass through. The two mesh strips play a dual role: on the one hand, they serve as anti-stick isolation layers; on the other hand, their densely distributed breathable mesh also constitute the end of the hot air outlet facing the membrane channel. Correspondingly, the upper and lower inner walls are provided with several breathable holes, so that hot air can pass through the breathable holes of the inner wall and the breathable mesh of the mesh strip in sequence, and be evenly blown out from the upper and lower surfaces of the entire channel.

[0033] To balance non-stick properties and heating efficiency, the non-stick mesh tape is made of Teflon (polytetrafluoroethylene) and processed into a mesh shape with uniform openings. Teflon material has excellent non-stick properties and high-temperature resistance (e.g., long-term temperature resistance of 170°C). In a preferred embodiment, the mesh opening diameter is set to 8mm × 8mm, and the mesh tape thickness is 0.8mm. This specification ensures air permeability while providing sufficient support for the film and ensuring its own structural strength.

[0034] The anti-stick mesh tape is attached to the inner wall of the enclosure using fixing components. Different fixing strategies are used for the mesh tape at different locations.

[0035] Please see Figure 1 and Figure 2 The upper anti-stick mesh strip 21 is installed as follows: its four edges are firmly fixed to the top inner wall of the upper box 11 by multiple pressure plates 31 and bolts 32. To prevent the large area of ​​the upper anti-stick mesh strip 21 from sagging and collapsing due to gravity, its central area is also secured to the internal support structure of the upper box 11 by several Teflon cable ties 33 passing through the mesh holes, serving as auxiliary support points.

[0036] Please see Figures 3 to 6The lower anti-stick mesh strip 22 is primarily installed using magnetic fixation. Specifically, iron plates 36 are fixed to the front and rear ends of the lower anti-stick mesh strip 22 using bolts 32 (for example, the mesh strip is clamped between two iron plates 36 and locked with bolts; alternatively, a single iron plate 36 can be fixed to the surface of the lower anti-stick mesh strip 22 using bolts 32). Correspondingly, a magnet fixing plate 38 equipped with magnets 37 is also fixed to the bracket on the bottom inner wall of the lower housing 12 using bolts 32. During installation, simply place the mesh strip with iron plates 36 in the designated position, and the iron plates 36 will automatically magnetically attract the magnets 37, thereby fixing the front and rear ends of the mesh strip. To protect the magnets 37, a stainless steel magnet cover 39 is also provided on its exterior. In addition, to further improve the fixing stability, a front fixing rod 41 is also provided at the front end of the lower anti-stick mesh strip 22. In one specific implementation, the front edge of the lower anti-adhesive mesh strip 22 can be folded and sewn to form a through sleeve, through which the front fixing rod 41 is inserted, thus firmly bonding with the mesh strip. Subsequently, the front fixing rod 41 is tied to the corresponding structure of the lower box 12 in a cross-shaped manner using an auxiliary fixing rope 40 (such as PTFE rope) to form an auxiliary fixation.

[0037] The working process of this invention is as follows: After the film enters the channel of the bellows, it is heated and stretched. In the subsequent retraction phase, the film becomes relaxed and floats up and down under the blowing of hot air. At this time, the floating film will come into contact with the surface of the upper anti-stick mesh belt 21 or the lower anti-stick mesh belt 22. Due to the anti-stick properties of Teflon material, the film will not stick to the mesh belt, thereby avoiding direct contact with the high-temperature inner wall of the bellows and effectively preventing film contamination or breakage. During this process, the hot air circulation is unimpeded, and the heating process remains stable.

[0038] In summary, this invention effectively solves the technical problem of the film sticking to the inner wall of the windbox during the retraction stage by detachably installing a Teflon anti-stick mesh strip inside the windbox and using a combination of "pressure plate + cable tie" or "magnetic attraction + rope" for fixing at different locations. This solution has a reasonable structural design, is securely installed, and is easy to maintain, significantly improving product quality and production stability.

[0039] Although specific embodiments of the present invention have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A wind box for thin film production, characterized by, include: The box body has an upper inner wall and a lower inner wall, and both the upper inner wall and the lower inner wall are provided with a number of ventilation holes; The upper anti-stick mesh strip is attached to the upper inner wall; and The lower anti-stick mesh strip is attached to the lower inner wall; The upper and lower anti-stick mesh belts are spaced apart, forming a channel for conveying the film. Both the upper and lower anti-stick mesh belts are made of Teflon material with breathable mesh holes. Hot air can pass through the breathable holes in the upper and lower inner walls, as well as the breathable mesh holes in the upper and lower anti-stick mesh belts, and finally enter the channel.

2. The bellows for thin film production according to claim 1, characterized in that, The upper anti-stick mesh strip and the lower anti-stick mesh strip are detachably attached to the upper inner wall and the lower inner wall by means of a fixing component.

3. The bellows for thin film production according to claim 2, characterized in that, The fixing assembly includes pressure plates for fixing the four edges of the upper anti-stick mesh strip and Teflon cable ties for fixing the middle of the upper anti-stick mesh strip.

4. The bellows for thin film production according to claim 2, characterized in that, The fixing assembly includes a magnetic fixing assembly for fixing the lower anti-stick mesh strip; the magnetic fixing assembly includes: Several iron plates are fixed to the front and rear ends of the lower anti-stick mesh strip; and Several magnets are disposed on the lower inner wall and magnetically attracted to the iron plate.

5. The bellows for thin film production according to claim 4, characterized in that, The magnet is mounted on a magnet fixing plate, and the magnet is covered with a stainless steel magnet cover.

6. The bellows for thin film production according to claim 4, characterized in that, The fixing component also includes: The front fixing rod passes through the sleeve formed by the front edge of the lower anti-stick mesh strip; and An auxiliary fixing rope is used to bind and fix the front fixing rod to the box body in a cross-shaped manner.

7. The bellows for thin film production according to claim 1, characterized in that, The enclosure includes a detachable upper enclosure and a lower enclosure.

8. The bellows for thin film production according to claim 1, characterized in that, The pore size of the breathable mesh is 8mm × 8mm.

9. The bellows for thin film production according to claim 1, characterized in that, The thickness of the upper anti-stick mesh strip and the lower anti-stick mesh strip is 0.8 mm.

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