Fabric capable of realizing three-dimensional structure for structural reinforcement of injection molded part

Abstract

The fabric for reinforcing the structure of the injection molding part and capable of realizing the three-dimensional structure, provided by the utility model, is formed by weaving the crisscrossed warps and wefts, a plurality of meshes are uniformly distributed on the breadth of the fabric, and the perimeters of the meshes are fixed, so that the fabric can form the three-dimensional structure through the deformation of the meshes when the fabric is pressed; the base plastic can be attached to an injection molding part with a complex three-dimensional shape, seams which cannot transmit loads through a fiber belt cannot exist on the injection molding part, the thickness cannot be increased, the edge of the injection molding part can be conveniently bestrewed with the base plastic, and after injection molding, the base plastic is connected with the fabric on the surface of the fabric, and can also be attached to the injection molding part on the surface of the fabric. The injection molding part further penetrates through meshes in the fabric to be connected with the fabric, the total connecting force is high, loads in different directions can be borne, and the reinforcing effect on the whole structure of the injection molding part is better.

Description

Technical Field

[0001] The utility model belongs to the technical field of injection molding, and in particular relates to a fabric used for reinforcing the structure of an injection molded part and capable of realizing a three-dimensional structure. Background Art

[0002] Injection molded parts refer to a general term for various injection molded products produced by injection molding machines. They are mainly made of polyethylene, polypropylene or other materials. They have the advantages of high production efficiency, convenient mass production, good molding effect, and high degree of freedom in shape design. They are widely used in automotive plastic parts such as fenders, bumper covers, instrument panels, and airbag covers. However, such injection molded parts usually have thin walls and low overall strength. In order to improve the structural strength, most of the existing technologies use fabric inserts in the injection molded parts. Common inserts are high-strength, high-modulus fiber tapes, such as glass fiber tapes. However, such fiber tapes have low elasticity and can only adapt to simple bending in a single direction. When encountering injection molded parts with complex shapes such as three-dimensional curved surfaces, the bending of a single fiber tape in a single direction cannot achieve a good fit. Therefore, two mutually perpendicular fiber tapes are generally bent from two different directions to achieve fitting, such as Figure 1 As shown, this solution will result in joints on the injection molded part where the load cannot be transferred through the fiber tape. The thickness will also increase to a certain extent at the overlapped part of the two fiber tapes. At the edge of the injection molded part, areas without fiber tapes are likely to be produced, thereby affecting the strengthening effect of the overall structure of the injection molded part.

[0003] Furthermore, this type of fiber tape is generally a planar structure. After becoming an insert, the connecting force between the fiber tape and the matrix plastic of the injection molded part comes from the bonding force between the fiber tape surface and the matrix plastic. When the injection molded part is subjected to a load that is not in the direction of the bonding force, this connecting force is difficult to exert and can only be resisted by the strength of the matrix plastic itself, which can easily lead to fiber tape dislocation, matrix plastic tearing, etc., and the ability to carry loads in different directions is weak. Utility Model Content

[0004] The purpose of the utility model is to overcome the shortcomings of the prior art and provide a fabric and an injection molding method for reinforcing the structure of an injection molded part and capable of realizing a three-dimensional structure.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is that the fabric used to strengthen the structure of the injection molded part and capable of realizing a three-dimensional structure is woven by criss-crossing warp and weft lines, and a plurality of meshes are evenly distributed on the width of the fabric, and the circumference of the meshes is fixed. When the fabric is pressed, the meshes can be deformed to form a three-dimensional structure of the fabric, thereby achieving fitting with the injection molded part.

[0006] Preferably, the woven portion of the warp and weft threads is wrapped with a rubber layer for fixing the perimeter of the mesh.

[0007] Further preferably, the adhesive layer is formed by drying glue containing a polyurethane dispersant.

[0008] Further preferably, the glue is also penetrated into the warp and weft lines before drying.

[0009] Further preferably, after drying, the weight of the adhesive layer on the fabric per square meter is 30g±3g.

[0010] Preferably, the material of the warp and weft threads includes aramid fiber and polyester fiber.

[0011] Preferably, the warp and weft threads include a warp thread group for forming one side of the mesh and a weft thread group for forming an adjacent side of the side, the warp thread group includes two independent and mutually twisted warp threads, and the weft thread group includes a weft thread in a straight state.

[0012] Further preferably, two warp threads of the warp thread group are twisted with each other at intervals, and each time they are interlaced, one weft thread is sandwiched in the middle.

[0013] Further preferably, the density of the warp thread group is 40 / 10 cm, and the density of the weft thread group is 35 / 10 cm.

[0014] Further preferably, the fabric is used to make automotive plastic parts.

[0015] Due to the application of the above technical solution, the utility model has the following advantages compared with the prior art:

[0016] The fabric used for reinforcing the structure of injection molded parts and capable of realizing a three-dimensional structure provided by the utility model is woven from criss-crossed warp and weft lines, and a plurality of meshes are evenly distributed on the fabric surface, and the circumference of the meshes is fixed. When the fabric is pressed, the meshes can be deformed to form a three-dimensional structure of the fabric, so as to achieve fitting with the injection molded parts with complex three-dimensional shapes, and no seams that cannot transmit loads through the fiber belts will be left on the injection molded parts, and no increase in thickness will be caused, and the edge parts of the injection molded parts can be easily covered. After injection molding, the matrix plastic is connected to the fabric not only on the fabric surface, but also through the meshes on the fabric to connect to the fabric. The total connection force is strong, and the loads in different directions can be withstood, so as to achieve a better reinforcing effect on the overall structure of the injection molded parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of using glass fiber tape to embed injection molded parts in the prior art.

[0018] Figure 2 It is a structural schematic diagram of a preferred embodiment of the fabric in the utility model.

[0019] Figure 3 yes Figure 1 The enlarged schematic cross-sectional view in the AA direction shows only a single latitude group and a single longitude group.

[0020] Figure 4 yes Figure 1 Schematic diagram of the three-dimensional structure formed by the fabric.

[0021] Figure 5 yes Figure 1 Schematic diagram of the fabric being embedded in an injection molded part.

[0022] Among them: 10. fabric; 11. mesh; 21. woven part; 22. warp; 23. weft; 30. adhesive layer. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art.

[0024] like Figures 2 to 5 As shown, the fabric 10 provided by the utility model for reinforcing the structure of injection molded parts and capable of realizing a three-dimensional structure is woven by criss-crossing warp and weft threads. A plurality of meshes 11 are evenly distributed on the surface of the fabric 10, and the circumference of the meshes 11 is fixed. Specifically, the woven portion 21 of the warp and weft threads and the warp and weft threads themselves are wrapped with an adhesive layer 30 for fixing the circumference of the meshes 11, and the adhesive layer 30 is formed by drying glue containing a polyurethane dispersant. Before drying, the glue also penetrates into the warp and weft threads. When the fabric 10 is pressed, the circumference of the meshes 11 can be deformed unchanged, so that the fabric 10 forms a three-dimensional structure, thereby realizing fitting with the injection molded part.

[0025] The advantage of this arrangement is that there will be no seams on the injection molded part that cannot transfer loads through the fiber belt, nor will it cause an increase in thickness. The edge of the injection molded part can be easily covered, and after injection molding, the matrix plastic is not only connected to the fabric on the fabric surface, but also connected to the fabric through the mesh on the fabric. The overall connection force is strong, can withstand loads in different directions, and has a better reinforcement effect on the overall structure of the injection molded part.

[0026] In the present embodiment, the warp and weft threads include a warp thread group for forming one side of the mesh 11 and a weft thread group for forming an adjacent side of the side. To ensure the stability of the mesh 11 on the inlay 10, the warp thread group further includes two independent and mutually twisted warp threads 22, and the weft thread group includes a weft thread 23 in a straight state. The two warp threads 22 of the warp thread group are twisted with each other at intervals, and a weft thread 23 is sandwiched in the middle each time they are interlaced (when interlaced, the tiny gaps between the two warp threads 22 and the weft threads 23 of the warp thread group are also filled with a glue layer 30), so that in the woven portion of the warp and weft threads, the two warp threads 22 of the warp thread group are respectively located above and below the weft thread 23. The warp threads 22 and the weft threads 23 are preferably aramid fibers or high-strength polyester fibers or carbon fibers, and other types of high-strength fibers may also be used. For the weaving of the fabric 10, different methods such as weaving and knitting may be used, as long as the same deformable mesh can be formed, and no limitation is made here.

[0027] The fabric 10 in this embodiment is used to make automotive plastic parts. Therefore, the deformation of the mesh 11 needs to have a certain flexibility so that the thickness of the adhesive layer 30 cannot be too thick. Of course, in order to achieve the stability of the fixed circumference of the mesh 11, the thickness of the adhesive layer 30 cannot be too thin. Preferably, after drying, the weight of the adhesive layer 30 per square meter of the fabric 10 is 30g±3g. At the same time, the density of the warp group and the weft group on the fabric 10 will also affect the deformation of the mesh 11. Preferably, the density of the warp group is 40 / 10cm, and the density of the weft group is 35 / 10cm.

[0028] In the present invention, due to the presence of the adhesive layer 30, the perimeter of each mesh 11 on the fabric 10 remains fixed. Figure 2 As shown, the mesh 11 can be regarded as a rectangle with fixed side lengths, which can undergo shear movement under the action of external force to become a parallelogram. At this time, the spacing between the warp group and the weft group will change. Through the different degrees of deformation of multiple meshes, the warp and weft can be made to present a curved state, so that the entire fabric 10 can present a three-dimensional structure without wrinkles or with fewer wrinkles, so as to achieve fitting with the shape of the injection molded part.

[0029] The utility model also provides an injection molding method for manufacturing a plastic part for a vehicle, comprising the following steps:

[0030] A. The fabric body is woven with crisscross warp and weft threads to form a fabric body with multiple meshes evenly distributed across the width;

[0031] B. Immerse the fabric body in glue;

[0032] C. After the glue has completely penetrated into the warp and weft threads, the fabric body is taken out and dried, so that the glue wrapped around the warp and weft threads and the woven parts of the warp and weft threads solidifies to form a glue layer, thereby obtaining the fabric;

[0033] D. Press the fabric through a mold to deform the mesh of the fabric without changing its circumference to form a three-dimensional structure;

[0034] E. Put the fabric with a three-dimensional structure into an injection mold for injection molding, so that the matrix plastic wraps the fabric and passes through the mesh to obtain an injection molded part.

[0035] The advantage of such a configuration is that the steps of the injection molding method can be simplified, the operation can be convenient, and injection molded parts with better structural strength and complex three-dimensional shapes can be produced, thereby expanding the application range of the injection molded parts.

[0036] During pressing in step D, the mesh undergoes shearing movement and becomes a parallelogram (deformation). At this time, the spacing between the warp and weft in the warp and weft lines will change. Through the deformation of multiple meshes to varying degrees, the warp and weft lines can be made to present a curved state, so that the entire fabric can present a three-dimensional structure without wrinkles or with fewer wrinkles, so as to achieve fitting with the shape of the injection molded part.

[0037] Preferably, the material of the warp and weft in step A includes aramid fiber, polyester fiber, and carbon fiber, and the density of the warp and weft in step A is 40 / 10 cm for warp and 35 / 10 cm for weft.

[0038] Preferably, the glue in step B contains a polyurethane dispersant.

[0039] Preferably, before drying in step C, the step also includes blowing away the glue adhering to the mesh with a hair dryer to unclog the mesh.

[0040] Preferably, after drying in step C, the weight of the adhesive layer on each square meter of fabric is 30 g ± 3 g.

[0041] The fabric and injection molding method provided by the utility model can completely fit the shape of the injection molded part to be strengthened, so that it is easier to cover the surface of the entire injection molded part, so that every corner of the entire injection molded part can be strengthened. Because there is no seam when the fabric covers the entire injection molded part, the strengthening effect is better, and the mesh structure in the fabric allows the base plastic during injection molding to pass through, so that the base plastic after injection molding can be fully combined with the fabric into one, thereby improving reliability during use.

[0042] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable people familiar with this technology to understand the content of the utility model and implement it accordingly. They cannot be used to limit the protection scope of the utility model. All equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. A fabric for reinforcing the structure of an injection molded part and capable of realizing a three-dimensional structure, woven from crisscrossing warp and weft threads, characterized in that: The fabric is evenly distributed with a plurality of meshes, the perimeter of the meshes is fixed, and when the fabric is pressed, the meshes are deformed so that the fabric forms a three-dimensional structure, thereby achieving fitting with the injection molded part.

2. The fabric for reinforcing the structure of injection molded parts and capable of realizing a three-dimensional structure according to claim 1, characterized in that: The woven parts of the warp and weft threads are wrapped with a rubber layer for fixing the perimeter of the mesh.

3. The fabric for reinforcing the structure of injection molded parts and capable of realizing a three-dimensional structure according to claim 2, characterized in that: After drying, the weight of the adhesive layer on the fabric per square meter is 30 g ± 3 g.

4. The fabric for reinforcing the structure of injection molded parts and capable of realizing a three-dimensional structure according to claim 1, characterized in that: The materials of the warp and weft threads include aramid fiber and polyester fiber.

5. The fabric for reinforcing the structure of injection molded parts and capable of realizing a three-dimensional structure according to claim 1, characterized in that: The warp and weft threads include a warp thread group for forming one side of the mesh and a weft thread group for forming an adjacent side of the side. The warp thread group includes two independent and mutually twisted warps, and the weft thread group includes a weft thread in a straightened state.

6. The fabric for reinforcing the structure of injection molded parts and capable of realizing a three-dimensional structure according to claim 5, characterized in that: Two warp threads of the warp thread group are twisted at intervals, and each interlacing sandwiches one weft thread in the middle.

7. The fabric for reinforcing the structure of injection molded parts and capable of realizing a three-dimensional structure according to claim 6, characterized in that: The density of the warp thread group is 40 / 10cm, and the density of the weft thread group is 35 / 10cm.

8. The fabric for reinforcing the structure of injection molded parts and capable of realizing a three-dimensional structure according to any one of claims 1 to 7, characterized in that: The fabric is used for making plastic parts for vehicles.

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