Hanging cloth injection mold and automobile interior parts produced by it

Abstract

The present invention relates to the field of automobile manufacturing technology, and discloses a cloth hanging injection mold and automobile interior parts produced by the mold, the mold comprising: a fixed mold, which is provided with a male mold part; a movable mold, which is provided with a female mold part, when the movable mold is molded with the fixed mold, the female mold part and the male mold part together constitute a molding cavity; a cloth hanging needle, which is provided with a plurality of cloth hanging needles, the plurality of cloth hanging needles are distributed on the periphery of the female mold part, and the needle tip of each cloth hanging needle faces the fixed mold; all cloth hanging needles have at least two different cutting edge lengths, the molding cavity has a high shrinkage area and a low shrinkage area, and the cutting edge length of the cloth hanging needle in the high shrinkage area is less than the cutting edge length of the cloth hanging needle in the low shrinkage area. The present technology reduces the shrinkage rate of injection molded parts by different layouts of the cloth hanging needles, and the modification cost is extremely low. Compared with the prior art, the present technology does not require changing the mold structure, base material or injection molding process, and has good application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of automobile manufacturing, in particular to a hanging cloth injection mold and an automobile interior decoration part produced therefrom. Background Art

[0002] In order to improve the appearance and feel, fabrics can be attached to the surface of automotive interior parts. At present, there are generally two ways to attach fabrics. The first is to attach them manually after the injection molding, and the second is to mold the fabric and plastic together during injection molding. The above two fabric attachment methods have their own advantages. The first method can be applied to fabrics of any material, while the second method has extremely high production efficiency.

[0003] For the second method, currently, the commonly used method is to fix the cloth hanging needle on the template through a pressure plate. The cloth hanging needle is used to fix the position of the fabric so that the fabric is always located at the preset position. When the injection molded part is solidified, shrinkage is inevitable. The existing technology uses various means to reduce the shrinkage rate of the injection molded part, such as increasing the holding time and temperature, optimizing the structure of the mold, and improving the base material. However, no matter which means is used to reduce the shrinkage rate of the injection molded part, it has a high cost.

[0004] Whether there is a lower-cost means to reduce the shrinkage rate of injection molded parts is a technical direction that the industry has been exploring. Summary of the invention

[0005] The present invention aims to provide a hanging cloth injection mold to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0006] According to the first aspect of the present invention, the hanging cloth injection mold comprises:

[0007] A fixed die having a male die portion;

[0008] A movable mold, which is provided with a concave mold part, when the movable mold is molded with the fixed mold, the concave mold part and the convex mold part together form a molding cavity;

[0009] There are multiple cloth hanging needles, and the multiple cloth hanging needles are distributed on the periphery of the die portion, and the needle tip of each cloth hanging needle is facing the fixed mold; all cloth hanging needles have at least two different cutting edge lengths, and the molding cavity has a high shrinkage area and a low shrinkage area, and the cutting edge length of the cloth hanging needle in the high shrinkage area is less than the cutting edge length of the cloth hanging needle in the low shrinkage area.

[0010] The cloth hanging injection mold according to the embodiment of the present invention has at least the following beneficial effects: before injection molding, the fabric is first hung on a plurality of cloth hanging needles by a robot, and the cloth hanging needles penetrate into the non-fitting area of ​​the fabric, and then the movable mold is closed in the direction of the fixed mold. After mold closing, the fitting area of ​​the fabric is located in the molding cavity, and the non-fitting area of ​​the fabric is located outside the molding cavity. Then, the molding machine injects plastic fluid into the molding cavity, and the mold is kept closed for a period of time after the injection is completed; the shorter the length of the cloth hanging needle blade, the shorter the cutting stroke of the fabric during mold closing, thereby the smaller the incision formed on the fabric, and the greater the tensile stress of the fabric at this point. Conversely, the longer the length of the cloth hanging needle blade, the longer the cutting stroke of the fabric during mold closing, thereby the larger the incision formed on the fabric, and the smaller the tensile stress of the fabric at this point, during the curing process of the injection molded part. In the process, the high shrinkage area of ​​the injection molded part will shrink rapidly. Since the fabric and the injection molded part are integrally formed, the high tensile stress of the fabric can resist the shrinkage of the injection molded part to a certain extent, so as to reduce the shrinkage of the injection molded part, which is beneficial to reduce the dimensional deviation of the injection molded part after curing. On the contrary, the low shrinkage area of ​​the injection molded part will shrink slowly. If the fabric maintains high tensile stress everywhere, then after the injection molded part is formed, the size will be poor and the fabric will be penetrated. Therefore, it is best to set a long-blade hanging needle in the low-shrinkage area to meet the rationality of the fabric stress distribution. The technology reduces the shrinkage of the injection molded part by different layouts of the hanging needles, and the modification cost is extremely low. Compared with the existing technology, the technology does not need to change the mold structure, base material or injection molding process, and has good application prospects.

[0011] According to some embodiments of the present invention, the molding cavity further has a gradient shrinkage area, and the shrinkage rate of the gradient shrinkage area is between the high shrinkage area and the low shrinkage area. The distribution of the shrinkage area of ​​the molding cavity needs to be determined according to the product drawing of the injection molded part by combining simulation software and experimental data.

[0012] According to some embodiments of the present invention, the cutting edge length of the hanging needle is negatively correlated with the shrinkage rate of the gradient shrinkage area. That is, the area with a higher shrinkage rate has a shorter cutting edge length of the corresponding hanging needle, and the area with a lower shrinkage rate has a longer cutting edge length of the corresponding hanging needle.

[0013] According to some embodiments of the present invention, the cutting edge of the cloth hanging needle has an edge and an arc edge, and the cloth hanging needle includes at least a long-edge needle and a short-edge needle, the edge of the long-edge needle faces away from the die portion, and the arc edge of the short-edge needle faces away from the die portion. Since the short-edge needle needs to maintain a high tensile stress on the fabric, the arc edge that does not cut the fabric needs to face away from the die portion to avoid the edge of the short-edge needle cutting the incision of the fabric when the fabric is stretched toward the molding cavity, so as to maintain the size of the incision; conversely, the edge of the long-edge needle faces away from the die portion, so that when the fabric is stretched toward the molding cavity, the edge of the long-edge needle can cut the incision of the fabric to expand the size of the incision.

[0014] According to some embodiments of the present invention, the needle tips of all the cloth hanging needles are located in the same plane to define the reference position for penetration of the fabric and to reduce the situation where the cloth hanging needles are left hanging empty.

[0015] According to some embodiments of the present invention, based on the design of the mold, since the starting points of some cloth hanging needles are located at a high position and the starting points of some cloth hanging needles are located at a low position, all cloth hanging needles have at least two different total lengths under the premise that the needle tips of all cloth hanging needles are in the same plane.

[0016] According to some embodiments of the present invention, based on the design of the mold, if the starting points of all the hanging cloth needles are located in the same plane, then all the hanging cloth needles have the same total length under the premise that the needle tips of all the hanging cloth needles are in the same plane.

[0017] According to some embodiments of the present invention, for a mold, as long as the most suitable layout of cloth hanging needles is determined, subsequent injection molded parts can always use this layout of cloth hanging needles. However, in order to find the most suitable layout of cloth hanging needles, the staff needs to conduct multiple experiments. Therefore, in order to facilitate the experiments, the cloth hanging needles can be detachably connected to the movable mold.

[0018] According to some embodiments of the present invention, the fixed mold is provided with an injection channel connected to the molding cavity. During injection molding, the plastic fluid is injected into the molding cavity from the outlet of the molding machine along the injection channel, and the fabric is squeezed toward the movable mold to prevent the plastic fluid from entering the gap between the fabric and the movable mold, so as to ensure that the fabric is in the outermost layer of the interior decoration part.

[0019] According to some embodiments of the present invention, the fixed mold is provided with a plurality of pinholes, and the positions of all the pinholes are arranged in one-to-one correspondence with the positions of all the cloth hanging needles, so as to ensure that the cloth hanging needles are kept away from air.

[0020] According to the second aspect of the present invention, the automotive interior decoration part is injection molded by the above-mentioned hanging cloth injection mold.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic diagram of the three-dimensional structure of a movable mold provided by an embodiment of the present invention;

[0023] Figure 2 yes Figure 1 A front view of the movable mold shown;

[0024] Figure 3 It is a schematic diagram of the three-dimensional structure of the long-blade needle and the short-blade needle provided in an embodiment of the present invention;

[0025] Figure 4 It is a top view of a cloth hanging needle provided by an embodiment of the present invention.

[0026] In the accompanying drawings: 100-movable mold, 110-die portion, 200-cloth hanging needle, 201-long blade needle, 202-short blade needle, 210-edge, 220-arc edge. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] 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.

[0029] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] like Figure 1 and Figure 2 As shown, an embodiment of the present invention provides a hanging cloth injection mold, which includes a fixed mold (not shown in the drawings) and a movable mold 100. Both the fixed mold and the movable mold 100 can use the existing low-pressure injection molding structure, that is, the fixed mold is provided with a male mold part, and the movable mold 100 is provided with a female mold part 110. The fixed mold remains stationary relative to the molding machine, while the movable mold 100 is in an active state relative to the fixed mold. Driven by the oil cylinder, the movable mold 100 can move in a direction close to or away from the fixed mold to achieve mold closing and mold opening.

[0032] When the movable mold 100 is molded with the fixed mold, the concave mold part 110 and the convex mold part together form a molding cavity. The size and shape of the molding cavity are designed according to the product drawing, and considering the shrinkage of the plastic during solidification, the size of the molding cavity is generally larger than the design size of the product drawing. Once the fixed mold and the movable mold 100 are processed, if the mold cannot produce a product with the required size, the mold needs to be repaired in size. If the repair is unsuccessful, the mold will be forced to be scrapped.

[0033] The production of automobile door guards, pillar guards and parcel shelf guards generally adopts low-pressure injection molding, which is a packaging process that uses very low injection pressure (0.15MPa to 4MPa) to inject hot melt materials into the mold and quickly solidify. The fabric is placed in the mold in advance, and then the plasticized molten plastic is injected into the closed molding cavity with the help of the screw thrust, and then the product is obtained after solidification. The material used for low-pressure injection molding fabrics can be cloth or PVC fabrics.

[0034] At present, multiple cloth hanging needles 200 can be used to fix the position of the fabric so that the fabric is always located at the preset position. All cloth hanging needles 200 are connected to the movable mold 100 and distributed on the periphery of the concave mold part 110, and the needle tip of each cloth hanging needle 200 is facing the fixed mold. Correspondingly, the fixed mold is provided with multiple pinholes, and the positions of all the pinholes are respectively set in a one-to-one correspondence with the positions of all the cloth hanging needles 200. When the movable mold 100 is molded with the fixed mold, each cloth hanging needle 200 is inserted into the corresponding pinhole to meet the requirement of avoiding air for the cloth hanging needle 200.

[0035] like Figure 3 As shown, all the cloth hanging needles 200 have at least two different blade lengths. Taking the cloth hanging needles 200 having two different blade lengths as an example, the cloth hanging needles 200 with long blades can be defined as long blade needles 201, and the cloth hanging needles 200 with short blades can be defined as short blade needles 202. The total length of the long blade needle 201 and the total length of the short blade needle 202 can be equal or unequal. Regardless of whether the total lengths of the two are equal, the blade length of the long blade needle 201 must be greater than the blade length of the short blade needle 202.

[0036] When the fabric is hung on the cloth hanging needle 200, the long blade needle 201 and the short blade needle 202 both pierce the non-fitting area of ​​the fabric and form a puncture hole. At this time, the fitting area of ​​the fabric is located at the corresponding position of the die portion 110. In the subsequent mold closing process, after the fabric abuts against the fixed mold, the fabric is deformed in the direction of the die portion 110 under the drive of the male mold portion. In this process, the fabric changes from a plane state to a three-dimensional state and generates an inward force. Under the action of the force, the blade of the cloth hanging needle 200 cuts the puncture hole of the fabric. The longer the blade length of the cloth hanging needle 200, the longer its cutting stroke to the fabric, and thus the larger the incision formed on the fabric; conversely, the shorter the blade length of the cloth hanging needle 200, the shorter its cutting stroke to the fabric, and thus the smaller the incision formed on the fabric.

[0037] For an injection molded part with an irregular shape, its molding cavity must have a high shrinkage area and a low shrinkage area. When the injection molded part is cured by injection molding, the shrinkage speed of the high shrinkage area is significantly faster than that of the low shrinkage area, causing the size of the injection molded part in the high shrinkage area to be significantly smaller than the design size of the product drawing. In order to reduce the shrinkage rate of the injection molded part during curing, the cutting edge length of the hanging needle 200 in the high shrinkage area is smaller than the cutting edge length of the hanging needle 200 in the low shrinkage area, that is, the short blade needle 202 is set at a position close to the high shrinkage area, and the long blade needle 201 is set at a position close to the low shrinkage area.

[0038] As mentioned above, the incision made by the short blade needle 202 on the fabric is small, so that the fabric is in a relatively tight state at this position, and the tensile stress at this position is large; on the contrary, the incision made by the long blade needle 201 on the fabric is large, so that the fabric is in a relatively loose state at this position, and the tensile stress at this position is small. Combined with the relevant settings of the hanging needle 200 and the shrinkage area, the tensile stress of the fabric in the high shrinkage area is greater than the tensile stress of the fabric in the low shrinkage area.

[0039] With the above structure, before injection molding, the fabric is first hung on a plurality of cloth hanging needles 200 by a manipulator, and the cloth hanging needles 200 penetrate into the non-fitting area of ​​the fabric, and then the movable mold 100 is molded toward the fixed mold. After the mold is closed, the fitting area of ​​the fabric is located in the molding cavity, and the non-fitting area of ​​the fabric is located outside the molding cavity. Next, the molding machine injects plastic fluid into the molding cavity, and the mold is closed for a period of time after the injection is completed. During the curing process of the injection molded part, the high shrinkage rate part of the injection molded part will shrink rapidly. Since the fabric and the injection molded part are integrally molded, the high tensile stress of the fabric can resist the shrinkage of the injection molded part to a certain extent, so as to reduce the shrinkage rate of the injection molded part, which is conducive to reducing the dimensional deviation of the injection molded part after curing. On the contrary, the low shrinkage rate part of the injection molded part will shrink slowly. If the fabric maintains high tensile stress everywhere, then after the injection molded part is molded, the size will be poor and the fabric will be penetrated locally. Therefore, it is best to set a long blade needle 201 in the low shrinkage area to meet the rationality of the fabric stress distribution.

[0040] In the prior art, when the cloth hanging injection mold cannot produce products with qualified dimensions, the mold needs to be repaired in size. If the repair fails, the mold will be forced to be scrapped. The present invention provides a brand new solution. For molds that cannot be repaired, this technology reduces the shrinkage rate of injection molded parts through different layouts of the cloth hanging needles 200, thereby producing products with qualified dimensions. In other words, this technology can continue production on a mold that is about to be scrapped.

[0041] like Figure 3 and Figure 4As shown, specifically, no matter it is a long blade needle 201 or a short blade needle 202, the edge of the cloth hanging needle 200 has an edge 210 and an arc edge 220. The arc edge 220 of the long blade needle 201 faces the die portion 110, and the edge 210 of the long blade needle 201 faces away from the die portion 110; on the other hand, the edge 210 of the short blade needle 202 faces the die portion 110, and the arc edge 220 of the short blade needle 202 faces away from the die portion 110. Since the short blade needle 202 needs to maintain a high tensile stress of the fabric, it is necessary to set the edge 210 that can cut the fabric toward the die portion 110, and set the arc edge 220 that cannot cut the fabric away from the die portion 110, so as to avoid the edge 210 of the short blade needle 202 cutting the fabric when the fabric is stretched toward the molding cavity, so as to maintain the size of the incision. On the contrary, the arc edge 220 of the long blade needle 201 is arranged toward the die portion 110, and its edge 210 is facing away from the die portion 110, so that when the fabric is stretched toward the molding cavity, the edge 210 of the long blade needle 201 can cut the fabric incision to expand the size of the incision. In other words, when the injection molded part is solidified and shrunk, the fabric will also be stretched toward the die portion 110 by the shrinkage force. Since the arc edge 220 of the short blade needle 202 is facing away from the die portion 110, and the arc edge 220 cannot be cut along the stretching direction of the fabric, the opening size of the incision associated with the short blade needle 202 remains unchanged; since the edge 210 of the long blade needle 201 is facing away from the die portion 110, and the edge 210 can be cut along the stretching direction of the fabric, the opening size of the incision associated with the long blade needle 201 can be expanded to further meet the technical requirements of fabric stress distribution.

[0042] Furthermore, in addition to the high shrinkage area and the low shrinkage area, the molding cavity also has a gradient shrinkage area. As the name implies, the shrinkage rate of the gradient shrinkage area is between the high shrinkage area and the low shrinkage area. As for the definition of the high shrinkage area, the gradient shrinkage area and the low shrinkage area, the staff determines it according to the product drawings of the injection molded parts by combining simulation software and experimental data. Different injection molded parts need to be analyzed separately. The blade length of the cloth hanging needle 200 is negatively correlated with the shrinkage rate of the shrinkage area, that is, the higher the shrinkage rate of the area, the shorter the blade length of the corresponding cloth hanging needle 200, and the lower the shrinkage rate of the area, the longer the blade length of the corresponding cloth hanging needle 200. For the cloth hanging needle 200 close to the gradient shrinkage area, the blade length is generally between the long blade needle 201 and the short blade needle 202. For the sake of convenience of description, the cloth hanging needle 200 with a blade length between the long blade needle 201 and the short blade needle 202 is defined as a medium blade needle (not shown in the drawings). The orientation of the edge 210 and the arc edge 220 of the medium blade needle needs to be determined in combination with simulation software and experimental data. But in general, in positions where the fabric needs to have high tensile stress, the arc edge 220 of the cloth hanging needle 200 should face away from the die portion 110, and in positions where the fabric does not need to have high tensile stress, the edge 210 of the cloth hanging needle 200 can face away from the die portion 110.

[0043] Of course, in other embodiments, the middle blade needle may not be provided, and all the middle blade needles are replaced by short blade needles 202. In this case, the long blade needles 201 are only provided on the side of the low shrinkage area, and the short blade needles 202 are provided in the remaining positions.

[0044] like Figure 1 and Figure 2 As shown, in some embodiments of the present invention, the needle tips of all the hanging needles 200 are in the same plane to define the reference position of the fabric insertion and reduce the situation where the hanging needles 200 are hung empty. If the needle tips of all the hanging needles 200 are not in the same plane, then when the robot takes the fabric and inserts multiple hanging needles 200, the hanging needles 200 at the lower position may not have penetrated the fabric, resulting in the fabric being hung empty at this position, so that the fabric cannot be located at the preset position, thereby producing defective products.

[0045] According to the design of the mold, since the starting points of some hanging cloth needles 200 are located at a high position and the starting points of some hanging cloth needles 200 are located at a low position, all hanging cloth needles 200 have at least two different total lengths under the premise that the needle tips of all hanging cloth needles 200 are in the same plane.

[0046] According to the design of the mold, if the starting points of all the hanging cloth needles 200 are located in the same plane, then all the hanging cloth needles 200 have the same total length under the premise that the needle tips of all the hanging cloth needles 200 are located in the same plane. The present invention does not specifically limit the total length of the hanging cloth needles 200. As long as the needle tips of all the hanging cloth needles 200 are located in the same plane, no matter how the total length of the hanging cloth needles 200 is set, it belongs to the protection scope of the present invention.

[0047] In some embodiments of the present invention, for a mold, as long as the most suitable layout of the hanging needles 200 is determined, the subsequent injection molded parts can always use the layout of the hanging needles 200. However, in order to find the most suitable layout of the hanging needles 200, the staff needs to conduct multiple experiments. Therefore, in order to facilitate the experiment, the hanging needles 200 are detachably connected to the movable mold 100 by means including but not limited to magnetic force, thread, buckle, etc., so as to replace different hanging needles 200. Alternatively, when the hanging needle 200 is broken, the staff can quickly replace the damaged hanging needle 200 through the detachable connection structure.

[0048] In some embodiments of the present invention, since the fixed mold remains stationary relative to the molding machine, in order to simplify the structure, the fixed mold is provided with an injection channel connected to the molding cavity, and the molding machine injects the plastic fluid into the molding cavity through the injection channel through a screw. During injection molding, the plastic fluid is injected into the molding cavity from the outlet of the molding machine along the injection channel, and squeezes the fabric toward the movable mold 100, preventing the plastic fluid from entering the gap between the fabric and the movable mold 100, so as to ensure that the fabric is always in the outermost layer of the interior decoration.

[0049] An embodiment of the present invention further provides an automobile interior decoration part, which is injection-molded by the above-mentioned hanging cloth injection mold.

[0050] Since the automobile interior decoration part adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0051] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. Hanging cloth injection mold, characterized in that: include: A fixed die having a male die portion; A movable mold, which is provided with a concave mold part, when the movable mold is molded with the fixed mold, the concave mold part and the convex mold part together form a molding cavity; A cloth hanging needle, wherein a plurality of the cloth hanging needles are distributed on the periphery of the die portion, and the needle tip of each cloth hanging needle faces the fixed mold; all cloth hanging needles have at least two different cutting edge lengths, the molding cavity has a high shrinkage area, a low shrinkage area and a gradient shrinkage area, the shrinkage rate of the gradient shrinkage area is between the high shrinkage area and the low shrinkage area, the cutting edge length of the cloth hanging needle in the high shrinkage area is smaller than the cutting edge length of the cloth hanging needle in the low shrinkage area, and the cutting edge length of the cloth hanging needle is negatively correlated with the shrinkage rate of the gradient shrinkage area; the cutting edge of the cloth hanging needle has an edge and an arc edge, and the cloth hanging needle includes at least a long-edge needle and a short-edge needle, the edge of the long-edge needle faces away from the die portion, and the arc edge of the short-edge needle faces away from the die portion.

2. The hanging cloth injection mold according to claim 1, characterized in that: The needle tips of all hanging needles are in the same plane.

3. The hanging cloth injection mold according to claim 2, characterized in that: All hooking needles have at least two different overall lengths.

4. The hanging cloth injection mold according to claim 2, characterized in that: All hooking pins have the same overall length.

5. The hanging cloth injection mold according to claim 1, characterized in that: The cloth hanging needle is detachably connected to the movable mold.

6. The hanging cloth injection mold according to claim 1, characterized in that: The fixed mold is provided with an injection flow channel connected to the molding cavity.

7. The hanging cloth injection mold according to claim 1, characterized in that: The fixed mold is provided with a plurality of pinholes, and the positions of all the pinholes are arranged in one-to-one correspondence with the positions of all the cloth hanging needles.

8. Automobile interior decoration parts, characterized in that: The automobile interior trim is injection molded by the hanging cloth injection mold according to any one of claims 1 to 7.

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