A polytetrafluoroethylene sealing tape product and its production process and production equipment

Abstract

The present application discloses a polytetrafluoroethylene sealing tape product and its production process and production equipment, and relates to the technical field of sealing products. The present application discloses a production process of a polytetrafluoroethylene sealing tape product, wherein the winding length of the composite film roll can be continuously increased as the sealing film is unwound, so that the prepared polytetrafluoroethylene sealing tape product can have a sufficient length and can directly seal a longer product without stacking multiple sealing sheets, which not only reduces the difficulty of operation, but also effectively improves the sealing performance.

Description

Technical Field

[0001] The present application relates to the technical field of sealing products, and in particular to a polytetrafluoroethylene sealing tape product and its production process and production equipment. Background Art

[0002] Teflon film, also known as polytetrafluoroethylene film, is usually used as a sealing material. However, since the thickness of a single-layer Teflon film is small after being stretched, its sealing performance is poor. Therefore, when Teflon film is used as a sealing material, it is usually necessary to laminate it.

[0003] In the prior art, such as the Chinese invention patent with application number 201710722761.1 and titled "A method, device and sealing product for rapidly manufacturing expanded polytetrafluoroethylene sealing sheets", the Teflon film is first continuously rolled into a multi-layer film roll, and then the multi-layer film roll is axially cut into a planar film roll stack, and finally the thickness of the film roll stack is compressed to complete the preparation of the sealing sheet.

[0004] Although the above-mentioned invention patent can increase the thickness of the Teflon film, since its multi-layer film roll is obtained by vertically winding the Teflon film, the length of the cut film roll stack will be limited by the width of the Teflon film itself, resulting in a relatively limited length of the obtained sealing sheet. When sealing a longer product, multiple sealing sheets need to be stacked and used, which is not only difficult to operate, but also the overall sealing performance of the multiple sealing sheets stacked on each other is poor. Summary of the invention

[0005] The first object of the present application is to overcome the deficiencies of the prior art and to provide a production process for a polytetrafluoroethylene sealing tape product that can be continuously stretched during production.

[0006] A production process provided in this application adopts the following technical solution: A production process of a polytetrafluoroethylene sealing tape product comprises the following steps: Step 1, unwinding a rolled polytetrafluoroethylene sealing film and a rolled hot melt adhesive film simultaneously, and during the unwinding process, laminating the sealing film and the hot melt adhesive film relative to each other to form a composite film; Step 2, heating the composite film so that adjacent film layers of the sealing film are relatively bonded under the action of the hot melt adhesive film; Step 3, spirally winding the composite film from one end corner thereof on a central roller, and making an angle θ between the width direction of the composite film and the axial direction of the roller shaft during winding; Step 4, stopping the winding of the composite film when the composite film is wound to a set number of layers, then cutting the winding end of the composite film and removing the wound composite film roll from the central roller; Step 5, cutting off the front end and the rear end of the composite film roll, and then pressing the composite film roll along the radial direction to obtain a planar polytetrafluoroethylene sealing tape product.

[0007] By adopting the above technical solution, the winding length of the composite film roll can continue to increase as the sealing film is unwound, so that the prepared polytetrafluoroethylene sealing tape product can have sufficient length and can directly seal longer products without the need to stack multiple sealing sheets. This not only reduces the difficulty of operation, but also effectively improves the sealing performance.

[0008] Preferably, the width of the sealing film is L, the width of the composite film roll is Δ, the number of winding layers of the composite film roll is N,

[0009] By adopting the above technical scheme, it is convenient to quickly obtain the winding angle θ of the composite film according to the set number of winding layers and winding width of the composite film roll, so as to complete the initial winding operation of the composite film and avoid affecting the forming of the composite film roll due to deviation of the winding angle of the composite film.

[0010] Preferably, the thickness of the sealing film is t, the thickness of the composite film roll is T, and T=t*N.

[0011] Preferably, N≥200.

[0012] Preferably, the temperature range for heating the composite film is 150-300°C.

[0013] By adopting the above technical solution, the hot melt adhesive film can be quickly melted under the action of heating, thereby effectively improving the structural strength of the composite film.

[0014] The second object of the present application is to provide a production equipment for polytetrafluoroethylene sealing tape products.

[0015] A production equipment provided in this application adopts the following technical solution: A production equipment for polytetrafluoroethylene sealing tape products, the production equipment is used to implement the above production process, and comprises an unwinding assembly, a winding assembly, a blanking assembly and a pressing and cutting assembly which are arranged in sequence; The unwinding assembly includes a first unwinding roller for unwinding the sealing film, a second unwinding roller for unwinding the hot-melt adhesive film, a laminating roller, an oven and a second cutter, and the rotation axis of the laminating roller is parallel to the first unwinding roller and the second unwinding roller respectively; the winding assembly includes a center roller which is movably arranged along its own axial direction, and the rotation axis of the center roller is arranged at an angle to the rotation axis of the laminating roller; the unwinding direction of the unwinding assembly is the same as the axial direction of the center roller.

[0016] By adopting the above technical solution, the production quality and production efficiency of polytetrafluoroethylene sealing tape products are effectively improved.

[0017] Preferably, the center roller includes a hollow first roller body, an air pipe coaxially arranged in the first roller body, a plurality of brackets spaced apart on the circumferential side of the air pipe and connected to the inner wall of the first roller body, and a plurality of air outlet holes spaced apart on the pipe wall of the air pipe. The circumferential roller wall of the first roller body is deformably arranged, and the end of the air pipe is connected to a suction module.

[0018] By adopting the above technical solution, the center roller can expand and contract during the inflation and deflation process of the air pipe, which greatly facilitates the unloading of the composite film roll on the center roller.

[0019] Preferably, the material removal assembly comprises a material removal ring which is arranged on the center roller and can slide along the axial direction of the center roller, and the inner diameter of the material removal ring is larger than the outer diameter of the center roller.

[0020] By adopting the above technical solution, the composite film roll can be quickly unloaded under the push of the unloading ring, further improving the unloading efficiency.

[0021] Preferably, the pressing and cutting assembly includes a lower press seat, an upper press seat which can be raised and lowered and is arranged on the lower press seat, and two first cutting knives which can be raised and lowered and are arranged on the lower press seat respectively. The lower press seat is provided with a pressing groove and two film cutting grooves, and the two film cutting grooves are respectively located on both sides of the pressing groove and correspond one-to-one to the two first cutting knives. The projection of the upper press seat on the lower press seat coincides with the pressing groove, and the projections of the two first cutting knives on the lower press seat coincide with the two film cutting grooves respectively.

[0022] By adopting the above technical solution, the composite film roll can be quickly cut off and pressed into shape at the end under the action of the upper pressing seat and the first cutting knife, thereby effectively improving the production efficiency of the polytetrafluoroethylene sealing tape product.

[0023] The third object of this application is to provide a polytetrafluoroethylene sealing tape product.

[0024] The polytetrafluoroethylene sealing tape product provided in this application adopts the following technical solution: A polytetrafluoroethylene sealing tape product is produced by the above production process.

[0025] By adopting the above technical solution, the prepared polytetrafluoroethylene sealing tape product can have sufficient length and thickness, which can not only directly seal longer products but also has excellent sealing performance.

[0026] In summary, the present invention includes at least one of the following beneficial technical effects: The winding length of the composite film roll can continue to increase as the sealing film is unwound, so that the prepared polytetrafluoroethylene sealing tape product can have sufficient length and can directly seal longer products without the need to stack multiple sealing sheets. This not only reduces the difficulty of operation, but also effectively improves the sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the production equipment in Example 2 of the present application; Figure 2 It is a schematic diagram of the local structure when the center roller in Example 2 of the present application is expanded; Figure 3 It is a schematic diagram of the local structure when the center roller in Example 2 of the present application is contracted.

[0028] Markings in the accompanying drawings: 1. Unwinding assembly; 11. First unwinding roller; 12. Second unwinding roller; 13. Laminating roller; 131. Second roller body; 14. Oven; 2. Winding assembly; 21. Center roller; 211. First roller body; 212. Air pipe; 213. Bracket; 214. Air outlet; 22. Suction module; 3. Unloading assembly; 31. Unloading ring; 4. Pressing and cutting assembly; 41. Lower pressing seat; 42. Upper pressing seat; 43. First cutting knife; 44. Pressing groove; 45. Film cutting groove; 5. Frame; 6. Second cutting knife. DETAILED DESCRIPTION

[0029] The present invention is further described in detail below in conjunction with specific embodiments.

[0030] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are 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, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0031] Embodiment 1: This embodiment discloses a production process of a polytetrafluoroethylene sealing tape product, comprising the following steps: Step 1, unwinding a rolled polytetrafluoroethylene sealing film and a rolled hot melt adhesive film simultaneously, and during the unwinding process, the sealing film and the hot melt adhesive film are relatively bonded to form a composite film. The unwinding directions of the rolled sealing film and the rolled hot melt adhesive film are the same, so that the sealing film and the hot melt adhesive film can be seamlessly bonded.

[0032] Step 2, heating the composite film so that adjacent film layers of the sealing film are relatively bonded under the action of the hot melt adhesive film. The temperature range for heating the composite film is 150-300°C. Under this temperature range, the hot melt adhesive film can be quickly melted under the action of heating, effectively improving the structural strength of the composite film.

[0033] Step 3, spirally wind the composite film from one end corner thereof on a central roller, the one end corner being the initial corner of the winding, and making an angle θ between the width direction of the composite film and the axial direction of the roller axis during the winding. The composite film is spirally wound from the initial corner, and the composite film roll can be continuously stretched along the axial direction of the central roller, and the final length of the composite film roll is positively correlated with the number of wound layers of the composite film.

[0034] In this embodiment, the width of the sealing film is L, the width of the composite film roll is Δ, the number of winding layers of the composite film roll is N, In this way, the winding angle θ of the composite film can be quickly obtained according to the set winding layer number and winding width of the composite film roll to complete the initial winding operation of the composite film and avoid affecting the forming of the composite film roll due to deviation of the winding angle of the composite film.

[0035] The thickness of the sealing film is t, the thickness of the composite film roll is T, T=t*N, N≥200.

[0036] Step 4, when the composite film is wound to the set number of layers, the winding is stopped, and then the winding end of the composite film is cut and the composite film roll formed by winding is taken off from the center roller 21. One side corner of the cut end of the composite film is the end corner of the winding, and the end corner is obliquely opposite to the initial corner. Among them, the center roller can use an expandable and contractible air shaft. The center roller is in an expanded state during winding and in a contracted state during unloading.

[0037] Step 5, cutting off the front end and the rear end of the composite film roll, and then pressing the composite film roll along the radial direction to obtain a planar polytetrafluoroethylene sealing tape product.

[0038] In this embodiment, the composite film is a rectangular film. After the composite film roll is formed, the composite film roll at the front end of the initial corner and the composite film roll at the rear end of the terminal corner are too thin due to the width of the composite film itself, which does not meet the sealing requirements. Therefore, it is necessary to cut off these two parts and then press the composite film roll into a flat shape. The specific cutting position can be obtained through simulation calculation.

[0039] In this way, the winding length of the composite film roll can continue to increase as the sealing film is unwound, so that the prepared polytetrafluoroethylene sealing tape product can have sufficient length and can directly seal longer products without the need to stack multiple sealing sheets. This not only reduces the difficulty of operation, but also effectively improves the sealing performance.

[0040] Example 2: See Figure 1 As shown, there is shown a production equipment for a polytetrafluoroethylene sealing tape product, which is used to implement the production process in Example 1, and includes a reeling assembly 1, a winding assembly 2, a blanking assembly 3 and a pressing and cutting assembly 4 arranged in sequence, and the reeling assembly 1, the winding assembly 2, and the pressing and cutting assembly 4 are respectively arranged on respective frames 5.

[0041] During production, the unwinding component 1 is used to unwind and bond the polytetrafluoroethylene sealing film and the hot-melt adhesive film, and then the winding component 2 is used to wind the composite film, and then the unloading component 3 is used to unload the composite film roll, and finally the pressing and cutting component 4 is used to cut off and press-form the end of the polytetrafluoroethylene sealing tape product.

[0042] In this embodiment, the unwinding assembly 1 includes a first unwinding roller 11 for unwinding the sealing film, a second unwinding roller 12 for unwinding the hot melt adhesive film, a laminating roller 13, an oven 14, and a second cutter 6. The laminating roller 13 is located on the side of the first unwinding roller 11 and the second unwinding roller 12, and the rotation axis of the laminating roller 13 is parallel to the first unwinding roller 11 and the second unwinding roller 12, respectively. The oven 14 is located on the side of the laminating roller 13, and the second cutter 6 is located on the side of the oven. After the sealing film and the hot melt adhesive film are unwound respectively, the two can pass through the laminating roller 13 synchronously and relatively fit under the action of the laminating roller 13, and then the relatively fitted composite film enters the oven 14 for bonding, and the bonded composite film enters the winding assembly 2 for winding, and after the winding is completed, the winding end of the composite film roll is cut off by the second cutter 6.

[0043] Among them, the first unwinding roller 11 and the second unwinding roller 12 are driven by a motor to rotate synchronously, the lamination roller 13 includes two second roller bodies 131 parallel to each other, the two second roller bodies 131 are driven by a motor to rotate synchronously, and there is a lamination gap between them for the composite film to pass through, and the oven 14 is an electric oven 14, which is located on one side of the lamination gap.

[0044] The second cutter 6 is arranged at the exit of the oven 14, and is driven by a linear motor and moves along the axial direction of the laminating roller 13. After the number of winding layers of the composite film reaches the requirement, the composite film can be cut by the second cutter 6.

[0045] The winding assembly 2 includes a central roller 21 that is movable along its own axial direction. The central roller 21 is driven to move and rotate by a linear motor, and its rotation axis is arranged at an angle with the rotation axis of the laminating roller 13, and the angle is the same as θ in Example 1. The central roller 21 is located on the side of the oven 14, and after the composite film is initially formed, it can be spirally wound on the central roller 21 from one end corner thereof.

[0046] In this embodiment, if Figure 2-3 As shown, the center roller 21 includes a hollow first roller body 211, an air delivery pipe 212 coaxially arranged in the first roller body 211, a plurality of brackets 213 spaced apart at the circumferential side of the air delivery pipe 212 and connected to the inner wall of the first roller body 211, and a plurality of air outlet holes 214 spaced apart on the tube wall of the air delivery pipe 212. The center roller 21 is an inflatable shaft made of a deformable material, and its circumferential roller wall is deformably arranged, and the end of the air delivery pipe 212 is connected to a suction module 22, which is a suction fan. Air is inflated into the air pipe 212 through the suction module 22, and the circumferential roller wall of the first roller body 211 expands due to the air pressure. At this time, the composite film can be wound on the expanded center roller 21; after the winding is completed, the suction module 22 inhales air, and the circumferential roller wall of the first roller body 211 shrinks. At this time, the outer diameter of the shrunk first roller body 211 is smaller than the inner diameter of the composite film roll, and the composite film roll can be easily loaded and unloaded from the center roller 21.

[0047] In this embodiment, again combined Figure 1 As shown, the unloading direction of the unloading assembly 3 is the same as the axial direction of the center roller 21, and it includes an unloading ring 31 disposed on the center roller 21 and capable of sliding along the axial direction of the center roller 21, and the inner diameter of the unloading ring 31 is greater than the outer diameter of the center roller 21. The unloading ring 31 is driven to move by two linear motors located on both sides of the center roller 21, and it can quickly push the composite film roll during the movement, realize the rapid unloading of the composite film roll, and further improve the unloading efficiency.

[0048] In this embodiment, the pressing and cutting assembly 4 is located at the end of the moving direction of the unloading ring 31, and includes a lower pressing seat 41, an upper pressing seat 42 which can be raised and lowered and arranged on the lower pressing seat 41, and two first cutters 43 which can be raised and lowered and arranged on the lower pressing seat 41, respectively. The lower pressing seat 41 is provided with a pressing groove 44 and two film cutting grooves 45, and the two film cutting grooves 45 are respectively located on both sides of the pressing groove 44 and correspond to the two first cutters 43 one by one, and the projection of the upper pressing seat 42 on the lower pressing seat 41 coincides with the pressing groove 44, and the projection of the two first cutters 43 on the lower pressing seat 41 coincides with the two film cutting grooves 45. Among them, the two first cutters 43 are respectively integrally formed on both sides of the upper pressing seat 42, and the three are driven by the same cylinder. After the unloading ring 31 pushes the composite film roll onto the lower pressing seat 41, the upper pressing seat 42 and the two first cutting knives 43 fall down synchronously, and the two first cutting knives 43 first contact the composite film roll and cut off the two ends of the composite film roll, and then the upper pressing seat 42 contacts the composite film roll and presses the composite film roll into shape, which effectively improves the production efficiency of the polytetrafluoroethylene sealing tape products.

[0049] Example 3: This example discloses a polytetrafluoroethylene sealing tape product, which is produced by the production process of Example 1 and the production equipment of Example 2. The obtained polytetrafluoroethylene sealing tape product has sufficient length and thickness, can not only directly seal longer products, but also has excellent sealing performance.

[0050] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A production process for polytetrafluoroethylene sealing tape products, characterized in that: The steps include: Step 1, unwinding a rolled polytetrafluoroethylene sealing film and a rolled hot melt adhesive film simultaneously, and during the unwinding process, laminating the sealing film and the hot melt adhesive film relative to each other to form a composite film; Step 2, heating the composite film so that adjacent film layers of the sealing film are relatively bonded under the action of the hot melt adhesive film; Step 3, spirally winding the composite film from one end corner thereof on a central roller, and making an angle θ between the width direction of the composite film and the axial direction of the roller during winding; Step 4, stopping the winding of the composite film when the composite film is wound to a set number of layers, then cutting the winding end of the composite film and removing the wound composite film roll from the central roller; Step 5, cutting off the front end and the rear end of the composite film roll, and then pressing the composite film roll along the radial direction to obtain a planar polytetrafluoroethylene sealing tape product.

2. The production process of a polytetrafluoroethylene sealing tape product according to claim 1, characterized in that: The width of the sealing film is L, the width of the composite film roll is Δ, the number of winding layers of the composite film roll is N, 3. The production process of a polytetrafluoroethylene sealing tape product according to claim 2, characterized in that: The thickness of the sealing film is t, the thickness of the composite film roll is T, and T=t*N.

4. The production process of a polytetrafluoroethylene sealing tape product according to claim 2 or 3, characterized in that: N≥200。 5. A production process for a polytetrafluoroethylene sealing tape product according to any one of claims 1 to 3, characterized in that: The temperature range for heating the composite film is 150-300°C.

6. A production equipment for polytetrafluoroethylene sealing tape products, characterized in that: The production equipment is used to implement the production process as described in any one of claims 1 to 5, and comprises an unwinding assembly (1), a winding assembly (2), a blanking assembly (3) and a pressing and cutting assembly (4) which are arranged in sequence; The unwinding assembly (1) comprises a first unwinding roller (11) for unwinding the sealing film, a second unwinding roller (12) for unwinding the hot melt adhesive film, a laminating roller (13), an oven (14) and a second cutter (6), wherein the rotation axis of the laminating roller (13) is parallel to the first unwinding roller (11) and the second unwinding roller (12), respectively; the winding assembly (2) comprises a center roller (21) which is movably arranged along its own axial direction, wherein the rotation axis of the center roller (21) is arranged at an angle to the rotation axis of the laminating roller (13); the unwinding direction of the unwinding assembly (3) is the same as the axial direction of the center roller (21).

7. The production equipment of a polytetrafluoroethylene sealing tape product according to claim 6, characterized in that: The center roller (21) comprises a hollow first roller body (211), an air supply pipe (212) coaxially arranged in the first roller body (211), a plurality of brackets (213) arranged at intervals on the circumferential side of the air supply pipe (212) and connected to the inner wall of the first roller body (211), and a plurality of air outlet holes (214) arranged at intervals on the pipe wall of the air supply pipe (212); the circumferential roller wall of the first roller body (211) is deformably arranged, and the end of the air supply pipe (212) is connected to a suction module (22).

8. The production equipment of a polytetrafluoroethylene sealing tape product according to claim 6, characterized in that: The material removal assembly (3) comprises a material removal ring (31) which is arranged on the center roller (21) and can slide along the axial direction of the center roller (21); the inner diameter of the material removal ring (31) is larger than the outer diameter of the center roller (21).

9. The production equipment of a polytetrafluoroethylene sealing tape product according to claim 6, characterized in that: The pressing and cutting assembly (4) comprises a lower pressing seat (41), an upper pressing seat (42) which can be raised and lowered and is arranged on the lower pressing seat (41), and two first cutting knives (43) which can be raised and lowered and are arranged on the lower pressing seat (41). The lower pressing seat (41) is provided with a pressing groove (44) and two film cutting grooves (45). The two film cutting grooves (45) are respectively located on both sides of the pressing groove (44) and correspond one to one with the two first cutting knives (43). The projection of the upper pressing seat (42) on the lower pressing seat (41) coincides with the pressing groove (44), and the projection of the two first cutting knives (43) on the lower pressing seat (41) coincides with the two film cutting grooves (45).

10. A polytetrafluoroethylene sealing tape product, characterized in that: The polytetrafluoroethylene sealing tape product is produced by the production process described in any one of claims 1-5.

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