Tensile fixture gasket for clamping thin film material, clamping body and thin film material tensile fixture

Abstract

The utility model provides a tensile fixture gasket for clamping a thin film material, a clamping body and a thin film material tensile fixture. The tensile clamp gasket comprises a clamping layer used for clamping a thin film material and a fixing layer used for being connected with a clamp body, the clamping layer is located on the fixing layer, the clamping layer comprises a plurality of convex bodies, and oil guide grooves are formed among the convex bodies. According to the thin film material stretching clamp provided by the utility model, the thickness change of a clamped thin film in the processing process can be compensated, the yield of a thin film finished product is improved, the thickness uniformity of the thin film finished product is improved, and the clamping force of a clamping surface is effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of film preparation, in particular to a stretching fixture gasket for clamping film materials, a clamp body and a film material stretching fixture. Background Technique

[0002] In the plastic film preparation process, the biaxial stretching method, as a molding method that has attracted much attention in recent years, can significantly improve the mechanical, optical, barrier, heat resistance and other properties of film materials. During the biaxial stretching process, the base film will be subjected to tensile forces in the transverse and longitudinal directions. At this time, a tooling fixture is required at the force application points to clamp the processing material. The traditional plate clamp fixture can be used to clamp and loosen the clamped specimen in the plastic film stretching process by switching between two use states of the pressing position and the release position, and can play a basic clamping role for the film materials that need to be stressed in multiple directions during the processing.

[0003] Ultra-thin films often require a certain temperature during the stretching process. In addition, due to the action of external forces in different directions, the thickness and hardness of the base film will change as the stretching progresses. Existing fixtures can no longer be well applied in the processing of film products with a large stretching ratio, ultra-thin thickness and high uniformity requirements. The main problems are as follows: ordinary fixtures cannot always firmly and safely clamp the film to be processed in response to the changes in the thickness and hardness of the clamped film during the processing; for the base film with oily substances on the processing surface, ordinary fixtures cannot meet the requirement that the clamping position does not shift; for ordinary fixtures to meet the use scenarios with high-precision processing requirements, the processing design is difficult and the cost is high. Content of the Utility Model

[0004] The embodiments of the utility model provide a stretching fixture gasket for clamping film materials, a clamp body of the film material stretching fixture and the film material stretching fixture, so as to solve at least one of the problems existing in the related technologies. To achieve this purpose, the utility model is realized through the following technical solutions.

[0005] The first aspect of the utility model provides a stretching fixture gasket for clamping film materials, including: a clamping layer for clamping film materials and a fixing layer for connecting with the clamp body. The clamping layer is located on the fixing layer. The clamping layer includes a plurality of convex bodies, and oil guide grooves are formed between the plurality of convex bodies.

[0006] Further, the Shore hardness of the clamping layer and the fixing layer is 65-80HA.

[0007] Further, the materials of the clamping layer and the fixing layer include one or more of silicone, rubber, fluororubber, heat-resistant Teflon, phenolic resin, polyurethane, POM, and PEEK.

[0008] Further, the clamping layer and the fixing layer are an integral structure or fixedly connected.

[0009] Further, the fixing layer has a limiting structure, and the limiting structure includes: the surface of the fixing layer where the clamping layer is located forms an angle greater than 90° with the side surface defining the thickness of the fixing layer; or at least one limiting protrusion is formed on the side surface defining the thickness of the fixing layer and is in interference fit with the groove on the side wall of the gasket fixing component of the clamp body for loading the stretching fixture gasket; or the bottom of the gasket fixing layer has a hollow structure, and the gasket fixing component of the clamp body of the stretching fixture gasket is semi-wrapped and in interference fit by the hollow structure of the gasket fixing layer.

[0010] Further, the plurality of convex bodies are linear or curved strip-shaped convex body arrays in at least two directions.

[0011] Further, the plurality of convex bodies are annularly arranged strip-shaped convex body arrays.

[0012] Further, the plurality of convex bodies are planar or dot-shaped convex body arrays.

[0013] Further, the height of the plurality of convex bodies and the depth of the oil guiding groove are 1 - 5 mm.

[0014] In a second aspect of the present invention, there is provided a clamp body of a thin film material stretching fixture, which is used to load the stretching fixture gasket for clamping the thin film material provided in the first aspect of the present invention. The clamp body includes: a gasket fixing component and a fixture connecting component. The gasket fixing component is used to accommodate the stretching fixture gasket, and the fixture connecting component is used to cooperate and connect with the base of the thin film material stretching fixture. Among them, the gasket fixing component has a corresponding structure matching the limiting structure of the fixing layer of the stretching fixture gasket to realize the limitation of the stretching fixture gasket.

[0015] In a third aspect of the present invention, there is provided a thin film material stretching fixture, which has the stretching fixture gasket for clamping the thin film material provided in the first aspect of the present invention and the clamp body of the thin film material stretching fixture provided in the second aspect of the present invention.

[0016] The embodiments of the present invention have the following beneficial effects:

[0017] (1) The stretching fixture gasket for clamping thin film materials provided by the present utility model is aimed at the characteristics that the thickness and hardness of the film change during the heating and stretching forming process of plastic thin film materials. By defining a heat-resistant gasket material with an appropriate Shore hardness, the gasket has the characteristic of slight expansion at a higher processing temperature, so as to compensate for the change in the thickness reduction of the thin film due to stretching by the increase in the thickness of the gasket; and the overly concentrated stress caused by the large processing clamping force can be partially released or conducted through the deformation of the gasket, so as to always maintain a clamping force sufficient to ensure that the thin film material is not clamped off and reduce the risk of the thin film being clamped through and broken during processing, improve the yield rate of the thin film finished product, and expand the safety range of the clamping force of the fixture to a certain extent.

[0018] (2) The stretching fixture gasket enables the oily liquid exuded from the surface of the plastic thin film to be discharged from the oil guide groove under the pressure of the initial clamping force by arranging an oil guide groove in the clamping layer, so that the thin film is in full contact with the clamping surface, thereby increasing the friction force between the thin film and the gasket during stretching, ensuring firm clamping, and ensuring that the base film will not affect the uniformity of the thickness of the finished thin film due to the inconsistent stress conditions at each point caused by the slippage of the clamping position.

[0019] (3) The stretching fixture gasket forms patterns in at least two directions by arranging convex bodies in the clamping layer, ensuring that the gasket has a certain roughness in both the transverse and longitudinal directions during the stretching process of the thin film material to prevent relative displacement between the clamping points of the fixture and the thin film.

[0020] (4) Due to the particularity of the biaxial stretching processing technology of thin film materials, the gasket and the clamp body need to adopt a specific fixing method to prevent relative movement between the gasket and the clamp body. The stretching fixture gasket provided by the present utility model abandons the traditional fixing methods of gluing and metal screws, and adopts a limit design for the structure of the gasket itself. Through special fixing methods such as the interference fit of the gasket itself and the clamp body in a wedge shape, setting limit protrusions at the edge of the fixing layer of the gasket, and the wrap-around limit of the clamp body and the fixing layer of the gasket, the excellent effect of fixing the gasket and the clamp body without using a third-party fixing medium is achieved, thereby avoiding the defects of traditional gluing and metal screw fixing.

[0021] (5) The stretching fixture gasket for clamping thin film materials provided by the present utility model and the clamp body used in cooperation with the gasket are designed with a detachable fixed connection between the clamp body and the fixture gasket, and can flexibly adjust the initial thickness and clamping surface conditions according to needs, converting the difficulty of designing the overall fixture and the clamping effect control system into the design of simple clamp body components, and reducing the processing precision requirements of the overall fixture.

[0022] (6) The thin film material stretching fixture provided by the present utility model can effectively improve the clamping force of the clamping surface. Description of the Drawings

[0023] The attached drawings that form a part of the present utility model are used to provide a further understanding of the present utility model. The schematic embodiments and descriptions thereof of the present utility model are used to explain the present utility model and do not constitute an improper limitation of the present utility model.

[0024] Figure 1 It is a schematic structural diagram of a stretching fixture gasket for clamping a film material in Embodiment 1 of the present utility model;

[0025] Figure 2 It is a central sectional view of a clamping body used in conjunction with the gasket in Embodiment 1 of the present utility model;

[0026] Figure 3 It is a schematic structural diagram of a stretching fixture gasket for clamping a film material in Embodiment 2 of the present utility model;

[0027] Figure 4 It is a schematic structural diagram of a clamping body used in conjunction with the gasket in Embodiment 2 of the present utility model;

[0028] Figure 5 It is a schematic structural diagram of a stretching fixture gasket for clamping a film material in Embodiment 3 of the present utility model;

[0029] Figure 6 It is a schematic structural diagram of a clamping body used in conjunction with the gasket in Embodiment 3 of the present utility model;

[0030] Figure 7 It is a perspective view of the assembled and mated body of the gasket and the clamping body in Embodiment 4 of the present utility model from a top-down perspective;

[0031] Figure 8 It is a perspective view of the assembled and mated body of the gasket and the clamping body in Embodiment 4 of the present utility model from a bottom-up perspective;

[0032] Figure 9 It is a front view of the assembled and mated body of the gasket and the clamping body in Embodiment 4 of the present utility model and a sectional view of the A-A plane in the front view;

[0033] Figure 10 It is a schematic structural diagram of a clamping body used in conjunction with the gasket in Embodiment 4 of the present utility model;

[0034] Figure 11 It is a statistical graph of the clamping force test for clamping the same plastic film using the film material stretching fixture provided by the present utility model and a common film material stretching fixture.

[0035] Reference numerals:

[0036] 1 - clamping layer; 2 - fixing layer; 3 - convex body; 4 - oil guiding groove; 5 - limiting protrusion; 6 - gasket fixing component; 7 - fixture connecting component; 8 - limiting convex body-shaped groove. Detailed Implementation Modes

[0037] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the following will elaborate on each implementation mode of the present utility model in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that in each implementation mode of the present utility model, many technical details are proposed to help readers better understand the present application. However, even without these technical details and various changes and modifications based on the following implementation modes, the technical solutions claimed in the present application can still be achieved. The division of the following embodiments is for convenience of description and should not constitute any limitation on the specific implementation mode of the present utility model. The various embodiments can be combined and cross-referenced with each other on the premise of no contradiction.

[0038] Embodiment 1

[0039] One aspect of the implementation mode of the present utility model provides a stretching fixture gasket for clamping a thin film material. Figure 1 It is a schematic structural diagram of the stretching fixture gasket for clamping a thin film material in Embodiment 1 of the present utility model. As Figure 1 shown, the gasket includes: a clamping layer 1 for clamping the thin film material and a fixing layer 2 for connecting with the clamp body. The materials of the clamping layer 1 and the fixing layer 2 are heat-resistant materials with a Shore hardness of 65 - 80 HA, such as one or more of silicone, rubber, fluororubber, heat-resistant Teflon, phenolic resin, polyurethane, POM (polyoxymethylene), and PEEK (polyetheretherketone); the clamping layer 1 is located on the fixing layer 2, and the clamping layer 1 and the fixing layer 2 are an integral structure or fixedly connected; the clamping layer 1 includes a plurality of convex bodies 3, and oil guiding grooves 4 are formed between the plurality of convex bodies 3. By providing the oil guiding grooves 4 in the clamping layer 1, the oily liquid exuded from the surface of the plastic film can be discharged from the oil guiding grooves 4 under the pressure of the initial clamping force, so that the film is in full contact with the clamping surface, thereby increasing the friction between the film and the gasket during the stretching process, ensuring firm clamping, and ensuring that the base film will not affect the thickness uniformity of the finished film due to the slippage of the clamping position and inconsistent stress conditions at each point.

[0040] In this embodiment, the clamping layer 1 is made of polyurethane with a hardness of 70 HA (Shore hardness), the fixing layer 2 is made of PEEK with a hardness of 80 HA (Shore hardness), the clamping layer 1 and the fixing layer 2 are fixedly connected, and the plurality of convex bodies 3 are linear or curved strip-shaped convex body arrays in at least two directions. As Figure 1As shown, in this embodiment, multiple convex bodies 3 are arranged as linear strip-shaped convex body arrays in two angular directions, namely horizontally and vertically. By forming patterns in both horizontal and vertical directions, it is ensured that during the stretching process of the thin film material, the gasket has a certain roughness in both the horizontal and vertical directions to prevent relative displacement between the clamping point of the fixture and the thin film. In this embodiment, the height of the multiple convex bodies 3 and the depth of the oil guiding groove 4 are 1 - 5 mm. For example, the height of the convex bodies 3 and the depth of the oil guiding groove 4 are both 1 mm.

[0041] In this embodiment, the fixed layer 2 has a wedge-shaped limiting structure, that is, the fixed layer 2 is in the shape of a frustum of a pyramid or a frustum of a cone, that is, the clamping plane forms an angle greater than 90° with the side flat / curved surface of the gasket. The smaller bottom surface of the frustum of a pyramid or a frustum of a cone is the starting surface of the clamping layer 1, and the larger bottom surface is the contact surface with the clamping body. For example, as Figure 1 shown, the fixed layer 2 is in the shape of a frustum of a cone, the radius of the lower bottom surface of the frustum of a cone is 15 mm and forms an angle of 30 degrees with the side curved surface, and the height of the fixed layer 2 is 2 mm. In this embodiment, the gasket itself and the clamping body form a wedge-shaped limiting interference fit, achieving the excellent effect of fixing the connection between the gasket and the clamping body without using a third-party fixing medium.

[0042] Another aspect of the embodiment of the present invention provides a clamping body of a thin film material stretching fixture for loading the above-mentioned gasket. Figure 2 This is the central sectional view of the clamping body used in conjunction with the gasket in Embodiment 1 of the present invention. As Figure 2 shown, the clamping body includes a gasket fixing component 6 located at the upper part and a fixture connecting component 7 located at the bottom. In this embodiment, the material of the clamping body is stainless steel. The gasket fixing component 6 is a groove corresponding to the shape of the gasket, and the fixed layer 2 of the gasket and the gasket fixing component 6 are fixedly connected through a wedge-shaped limiting interference fit; the fixture connecting component 7 is a stud for fixedly connecting with the fixture base.

[0043] Another aspect of the embodiment of the present invention provides a thin film material stretching fixture, which has the above-mentioned stretching fixture gasket for clamping thin film materials and the clamping body of the thin film material stretching fixture. Each of the following embodiments provides a thin film material stretching fixture having a gasket and a clamping body. For the sake of brevity, it will not be elaborated further.

[0044] Embodiment 2

[0045] One aspect of the embodiment of the present invention provides a stretching fixture gasket for clamping thin film materials, Figure 3 This is the structural schematic diagram of the stretching fixture gasket for clamping thin film materials in Embodiment 2 of the present invention. Only the parts different from Embodiment 1 will be described below. As Figure 3As shown, the gasket includes: a clamping layer 1 for clamping the film material and a fixing layer 2 for connecting with the clamping body. Among them, the clamping layer 1 and the fixing layer 2 are integrally formed, and their materials are both temperature-resistant Teflon with a hardness of 80 HA (Shore hardness). In this embodiment, as Figure 3 shown, the multiple convex bodies 3 are strip-shaped convex body array rings arranged in a ring shape. Among them, the height of the convex body 3 and the depth of the oil guiding groove 4 are both 3 mm. The fixing layer 2 is cylindrical, the diameter of the bottom surface of the cylinder is, for example, 13 mm, and the height is 4 mm. A cylindrical limiting protrusion 5 is arranged on the cylindrical side surface of the fixing layer 2.

[0046] Another aspect of the embodiment of the present invention provides a clamping body of a film material stretching fixture for loading the above-mentioned gasket. Figure 4 It is a schematic structural diagram of the clamping body used in conjunction with the gasket in Embodiment 2 of the present invention. As Figure 4 shown, the clamping body includes a gasket fixing component 6 located at the upper part and a fixture connecting component 7 located at the bottom, and the two are fixedly connected as different entities. In this embodiment, the material of the clamping body is copper. The gasket fixing component 6 is a groove corresponding to the shape of the gasket, and a limiting convex body-shaped groove 8 corresponding to the cylindrical limiting protrusion 5 of the gasket is arranged on the side wall of the groove. The gasket and the clamping body are fixedly connected through the interference fit of the limiting protrusion 5 and the limiting convex body-shaped groove 8. The fixture connecting component 7 is a cylinder for fixedly connecting with the fixture base.

[0047] Embodiment 3

[0048] One aspect of the embodiment of the present invention provides a stretching fixture gasket for clamping a film material, Figure 5 It is a schematic structural diagram of the stretching fixture gasket for clamping a film material in Embodiment 3 of the present invention. Only the parts different from Embodiment 1 are described below. As Figure 5 shown, the gasket includes: a clamping layer 1 for clamping the film material and a fixing layer 2 for connecting with the clamping body. Among them, the clamping layer 1 and the fixing layer 2 are integrally formed, and their materials are both silica gel with a hardness of 65 HA (Shore hardness). In this embodiment, as Figure 5 shown, the multiple convex bodies 3 are planar convex body arrays. Among them, the height of the convex body 3 and the depth of the oil guiding groove 4 are both 1 mm. The fixing layer 2 is cylindrical, the diameter of the bottom surface of the cylinder is, for example, 13 mm, and the height is 4 mm. Two symmetrical cylindrical limiting protrusions 5 are arranged on the cylindrical side surface of the fixing layer 2.

[0049] Another aspect of the embodiment of the present invention provides a clamping body of a film material stretching fixture for loading the above-mentioned gasket. Figure 4 It is a schematic structural diagram of the clamping body used in conjunction with the gasket in Embodiment 3 of the present invention. As Figure 6As shown in the figure, the clamping body includes a gasket fixing component 6 located at the upper part and a fixture connecting component 7 located at the bottom. The two are fixedly connected as different entities. In this embodiment, the material of the clamping body is iron. The gasket fixing component 6 is a groove corresponding to the shape of the gasket, and two symmetrical limiting convex-shaped grooves 8 corresponding to the two symmetrical cylindrical limiting protrusions 5 of the gasket are provided on the side wall of the groove. The gasket and the clamping body are fixedly connected through the interference fit between the limiting protrusion 5 and the limiting convex-shaped groove 8. The fixture connecting component 7 is a cylinder for fixedly connecting with the fixture base.

[0050] Embodiment 4

[0051] The embodiment of the present utility model provides a stretching fixture gasket for clamping a thin film material and a clamping body for loading the gasket. Figure 7 It is a perspective view from the top view angle of the assembled and mated body of the gasket and the clamping body in Embodiment 4 of the present utility model. Figure 8 It is a perspective view from the bottom view angle of the assembled and mated body of the gasket and the clamping body in Embodiment 4 of the present utility model. Figure 9 It is the front view and the sectional view of the A-A plane of the front view of the assembled and mated body of the gasket and the clamping body in Embodiment 4 of the present utility model. Only the parts different from Embodiment 1 are described below. As Figure 7 and Figure 8 shown, the gasket includes: a clamping layer 1 for clamping the thin film material and a fixing layer 2 for connecting with the clamping body. Among them, the clamping layer 1 and the fixing layer 2 are integrally formed, and their materials are both fluororubber with a hardness of 70 HA (Shore hardness). In this embodiment, the structure of the protrusion 3 is the same as that in Embodiment 3, and will not be elaborated here.

[0052] In this embodiment, as Figure 8 and Figure 9 shown, the fixing layer 2 is a cylinder with a hollow structure at the bottom. A hollow cylinder space is dug out at the bottom of the cylinder, and the gasket fixing component 6 of the clamping body is semi-wrapped in this cylinder space, and a partial area at the bottom of the gasket fixing component 6 is exposed, so as to realize the semi-wrapped limit of the clamping body and the fixing layer of the gasket.

[0053] Next, the maximum clamping force of the thin film material stretching fixture provided by the present utility model and the ordinary thin film material stretching fixture is further tested. Figure 11 It is a statistical chart of the clamping force test of the same plastic film (the clamping area is 3 cm 2 ) by using the thin film material stretching fixture provided by the present utility model (improving the clamping force of the fixture) and the ordinary thin film material stretching fixture (ordinary fixture clamping force). It can be seen from the test results that using the thin film material stretching fixture provided by the present utility model can effectively improve the clamping force.

[0054] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A stretching fixture gasket for clamping a film material, characterized in that: include: A clamping layer (1) for clamping a thin film material and a fixing layer (2) for connecting to a clamping body, wherein the clamping layer (1) is located on the fixing layer (2), and the clamping layer (1) comprises a plurality of protrusions (3), wherein oil guide grooves (4) are formed between the plurality of protrusions (3).

2. The stretching fixture gasket for clamping a thin film material according to claim 1, characterized in that: The Shore hardness of the clamping layer (1) and the fixing layer (2) is 65-80 HA.

3. The stretching fixture gasket for clamping a thin film material according to claim 1, characterized in that: The clamping layer (1) and the fixing layer (2) are an integrated structure or are fixedly connected.

4. The stretching fixture gasket for clamping a thin film material according to claim 1, characterized in that: The fixed layer (2) has a limiting structure, and the limiting structure comprises: The surface of the fixing layer (2) on which the clamping layer (1) is located forms an angle greater than 90° with the side surface that defines the thickness of the fixing layer (2); or At least one limiting protrusion (5) is formed on the side surface that limits the thickness of the fixing layer (2) and is interference-fitted with a groove on the side wall of the gasket fixing component (6) of the clamp body that carries the stretching clamp gasket; or The bottom of the fixing layer (2) has a hollow structure, and the gasket fixing component (6) of the clamping body of the stretching clamp gasket is half-wrapped by the hollow structure of the fixing layer (2) in an interference fit.

5. The stretching fixture gasket for clamping a thin film material according to claim 1, characterized in that: The plurality of protrusions (3) are linear or curved strip-shaped protrusion arrays in at least two directions.

6. The stretching fixture gasket for clamping a thin film material according to claim 1, characterized in that: The plurality of convex bodies (3) are in the form of a ring of strip-shaped convex body arrays arranged in a ring shape, or in the form of a surface or point-shaped convex body arrays.

7. The stretching fixture gasket for clamping a thin film material according to claim 1, characterized in that: The height of the plurality of protrusions (3) and the depth of the oil guide groove (4) are 1-5 mm.

8. A clamp body for a film material stretching clamp, characterized in that: The clamp body is used to load the stretching clamp gasket for clamping thin film materials as described in any one of claims 1 to 7, and the clamp body includes: a gasket fixing component (6) and a clamp connecting component (7), the gasket fixing component (6) is used to accommodate the stretching clamp gasket, and the clamp connecting component (7) is used to cooperate with the base of the thin film material stretching clamp, wherein the gasket fixing component (6) has a corresponding structure matching the limiting structure of the fixing layer (2) of the stretching clamp gasket to achieve the limiting of the stretching clamp gasket.

9. A film material stretching clamp, comprising a stretching clamp gasket for clamping a film material as claimed in any one of claims 1 to 7 and a clamp body of the film material stretching clamp as claimed in claim 8.

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