JP2008188892A - Method of molding plastic joint molding and mold for it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of molding a joint molding rarely causing separation of a hard resin member from a soft resin member and a mold for the method. <P>SOLUTION: The method is used to mold a plastic joint molding in which a hard resin member is joined with a soft resin member and comprises the hard resin member arranging process of arranging a hard resin member having been injection-molded in a mold for molding of a soft resin member and the soft resin member injecting process of injecting a soft resin member into the cavity of the mold. The mold for molding a joint molding is capable of preventing detachment by causing a soft resin member to penetrate a through-hole of the hard resin member and to mount the soft resin member securely and has a fixing implement, a holder, a flash-preventive pressing implement and a protruding device. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for molding a plastic bonded product in which plastic molded products having different hardnesses are overlapped, and a mold for molding a plastic bonded molded product for laminating a hard resin member and a soft resin member.

Attempts have been made to mold a plastic composite in which a plurality of plastic resins having different hardnesses are laminated by overlapping a plurality of plastic resin members having different hardnesses in accordance with the purpose of use. A plastic composite having a structure in which a soft resin member is disposed on a portion in contact with the body and a hard resin member is disposed on an abutting surface of the outer surface is used. A contact surface that can withstand external impacts uses an outer protective part that uses a hard resin member with hardness, and a soft resin member as a relatively soft inner member for a part that may come into contact with the body or the like It is desirable that a product in which this is integrated can be plastic molded.
Although it is possible to integrally mold the soft resin member and the hard resin member, it is difficult to perform molding once when the thermoplastic resin having different melting temperatures is cured. When creating such a double-layered plastic laminate, first prepare a resin material with a high melting temperature by injection molding one resin member as a prior primary process, and already as a secondary process. It is conceivable that the resin member that is in a stable state after injection molding is placed in the mold cavity of the secondary process and another resin member is injection molded into the mold. (See Patent Documents 1 and 2)

Since the resin member in a stable state is softened by heating, such a simple method can use only a resin material having limited hardness and melting temperature, and can only produce a relatively hard product. In addition, in the conventional example, the selection of the outer hard resin member is relatively free, but a soft resin member such as an elastomer cannot be used as the inner shock absorbing resin, and it has an appropriate hardness to withstand use. It was difficult to produce a composite of different plastics of different hardness.
A plastic composite is used as a protective device for sports. For example, in a shin guard that is a sneak pad for soccer, a hard resin is used on the outside, and an impact absorbing portion made of a soft resin member is provided on the inner surface of the plate made of the hard resin. (See Patent Document 3).

  Therefore, there has been a demand for a method for forming a plastic contact synthetic product having a soft resin member provided on the contact surface with improved hardness that enables plastic molding and a stable and inexpensive provision of the contact composite product.

Japanese Patent Publication No. 2002-361768 Japanese Patent Publication No. 2003-103561 Registered Utility Model No. 3051104

  In order to solve the above-described problem, the present invention is such that the hard resin member and the soft resin member are joined so that the hard resin member and the soft resin member are not separated from each other. By placing the molded hard resin member in the cavity of the soft injection mold and injecting the soft resin material, the soft resin member enters the through-hole provided in the hard resin member and is firmly fixed. An object of the present invention is to provide a method for forming a plastic bonded molded product that can be prevented from being peeled off by being attached to the mold, and a mold therefor.

In order to achieve the above object, a method for molding a plastic joint molded product according to the present invention is a method for molding a plastic joint molded product in which a soft resin member is joined to a hard resin member, and the molded hard resin member is a soft resin. This is a configuration comprising a hard resin member placement step for placing in a mold for molding a member and a soft resin member injection step for injecting a soft resin member into a cavity of the die.
The soft resin member injection step of injecting the soft resin member into the mold is configured to set the resin temperature of the soft resin member to be injected to 170 degrees to 230 degrees.
Further, the soft resin member injection step has a configuration in which the peripheral edge portion of the hard resin member is coated with the soft resin member.

The hard resin member is a hard vinyl chloride resin, an olefin resin such as polypropylene (PP) / polyethylene (PE), or a styrene resin such as polystyrene (PS) / acrylonitrile butadiene styrene (ABS). In addition, polycarbonate resin such as polycarbonate (PC) / polycarbonate and ABS alloy resin, thermoplastic resin material such as terephthalate resin such as polyethylene terephthalate / polybutylene terephthalate, or resin material such as thermosetting resin is injected. It is also the structure to shape | mold.
Further, the soft resin member is composed of a soft vinyl chloride resin or a thermoplastic elastomer such as a styrene elastomer, a vinyl chloride elastomer, an olefin elastomer, a urethane elastomer, a polyester elastomer, a nitrile elastomer, a polyamide elastomer, and a fluorine elastomer. It is the composition which becomes.

  Further, the hard resin member has a configuration in which one or a plurality of holes are formed in the periphery, and a periphery in which the periphery is formed thinner than the main body is provided in the periphery. Further, the hard resin member has a structure in which one or a plurality of holes penetrating the hard resin member are formed so as to be securely attached to a mold for molding the soft resin member.

On the other hand, a mold for injection molding of a soft resin member is a mold for a molding machine, and a thin rod-shaped fixture for fixing a hard resin member to the mold is a mold for molding a soft resin member. One or more of them are erected in the horizontal direction toward the cavity (hollow part).
Further, in order to prevent the hard resin member from being deformed or displaced due to the pressure applied in the mold during the pressure injection of the soft resin member, there is a convex holder that presses and holds the periphery of the hard resin member toward the cavity. One or more of them are erected in the horizontal direction toward the cavity (hollow part).
In addition, in order to prevent the occurrence of excessive burrs on the edge that occurs when the soft member is coated on the peripheral edge of the hard resin member, it is pressed against the back surface of the portion not covered near the end of the hard resin member. In this configuration, one or a plurality of convex deburring prevention pressing tools are erected in the horizontal direction toward the cavity (hollow portion).

  In addition, the mold has a horizontal pin so that the molded product can be ejected diagonally in any operation in order to ensure that the plastic joint molded product molded after the completion of injection molding is peeled from the mold without damage. It is also a configuration in which a protruding device that protrudes is arranged near the gate. Also, a structure in which a gate for injecting the soft resin member is formed on the upper side, the side surface, or the lower side of the mold so that the soft resin member can be injected from the lateral direction of the hard resin member installed in the mold, or soft The structure which formed the gate which inject | emits a soft resin member in the center of a metal mold | die so that the resin member can be injected from the center of the coating surface of the said hard resin member installed in the metal mold | die may be sufficient.

Since the molding method for plastic joint molded products and the mold for molding plastic joint molded products according to the present invention have the above-described configuration, the following effects can be obtained.
1. A soft resin material is injected into the mold cavity after mounting the pre-injected hard resin member to the mold for injection molding of the soft resin member, so the soft resin member is in close contact with the hard resin member by the injection pressure Since the soft members are attached to the inside of the hard resin member because they are joined, for example, if the soft member is applied to the surface in contact with the skin, sufficient hardness and contact friendly to the skin can be obtained.
2. Since the resin temperature of the soft resin member to be injected in the process of superimposing the hard resin member and the soft resin member is set to 170 degrees to 230 degrees, the soft resin member is in a plastic state, whereas the hard resin member There exists an advantage which can be made to fuse | melt by approaching a plastic state.
3. Since the soft resin member is also coated on the peripheral portion of the hard resin member, the soft resin member is not peeled off from the hard resin member.

4). Available hard resin materials include hard vinyl chloride resins, olefin resins such as polypropylene (PP) and polyethylene (PE), styrene resins such as polystyrene (PS) and acrylonitrile butadiene styrene (ABS), and polycarbonate. (PC) Polycarbonate resins such as polycarbonate and ABS alloy resins, and thermoplastic resin materials such as terephthalate resins such as polyethylene terephthalate and polybutylene terephthalate, or resin materials such as thermosetting resins can be used. So most materials are convenient.
5. As the soft resin material, soft vinyl chloride resin or thermoplastic elastomer such as styrene elastomer, vinyl chloride elastomer, olefin elastomer, urethane elastomer, polyester elastomer, nitrile elastomer, polyamide elastomer, fluorine elastomer, etc. is used. Because it can be used, it is possible to use even a sufficiently soft material.

6). A plurality of holes are made in the periphery of the hard resin member, and the soft resin member is embedded in the hole, so the soft resin member is not easily separated from the hard resin member. Can fulfill the function.
7). Moreover, in the structure which employ | adopted the structure which arrange | positions the peripheral part formed thinly compared with the main body at the periphery of a hard resin member, since many soft resin members surround a periphery, a soft resin member remove | deviates from a hard resin member. There is no.
8). Furthermore, by adopting a configuration in which the hole is formed so as to penetrate the center of the main body of the hard resin member, the soft resin member also enters the hole and is further difficult to be separated from the hard resin member.
9. Since a pin for inserting and fixing a molded product made of a hard resin material is erected in the cavity of the mold of the soft resin member, just insert the pin into the hole provided in the hard resin member With this simple mechanism, the hard resin member can be fixed in the mold.

10. Also, in order to prevent the hard resin member from being deformed or displaced in the mold when injecting the soft resin material, a holding pin is placed horizontally on the periphery of the hard resin member of the mold toward the cavity (cavity). Since one or more of them are erected, deformation or displacement can be prevented with a simple structure.
11. The finish is very beautiful because the hard resin member is strongly pressed against the mold to prevent the excess soft resin member from entering the periphery of the hard resin member as a burr, thereby preventing the inflow of the soft resin member.
12 Since the mold is provided with a protruding device for peeling that introduces air between the soft resin member and the mold so that it can be peeled cleanly when taking out the finished joined product from the mold, Even a sufficiently soft bonded product can be peeled off from the mold of the injection molding machine without being damaged.
13. The injection gate of the soft resin member may be provided anywhere, but considering the possibility of pressure and breakage, it is provided at the upper end and the side end, so that it is easy to take out without obstructing.
14 The injection gate can also be provided in the center of the joint molded product from the viewpoint of applying the pressure of the soft resin member evenly.

  Hereinafter, a method for molding a plastic bonded product according to the present invention and a configuration of a forming mold used therefor will be described in detail based on an embodiment shown in the drawings. FIG. 1 is a flowchart showing the steps of a method for molding a plastic-plastic joint molded product according to the present invention, FIG. 2 is a plan view of a mold for molding a plastic joint-molded product, and FIG. It is a top view of the metal mold | die for shaping | molding. 4 is a perspective view of a hard resin member mounted on a mold of a soft resin member, FIG. 5 is a plan view of another example of the hard resin member, and FIG. 6 is a partial cross-sectional view of the hard resin member. is there.

With reference to FIG. 1, the method for molding a plastic bonded product of the present invention will be described in detail.
The plastic bonding molded product molding method 10 of the present invention includes a hard resin member placement step 20 and a soft resin member injection step 30.
The hard resin member placement step 20 is a step 20 in which a hard resin member that has been injection-molded in advance and has a stable shape is placed in a molding die for a soft resin member. . In this embodiment, the imperial resin member is molded by injection molding, but the molding method is not limited. As the hard resin material used in the hard resin member arranging step 20, a resin material such as polypropylene, nylon, polyurethane, polyester, polyethylene, polyvinyl chloride, polycarbonate, or thermosetting resin is injection-molded. In this embodiment, polypropylene is used for injection molding.

In the soft resin member injection step 30, the hard resin member 40, which has been injection molded in advance and has a stable shape, is placed in a mold for molding the soft resin member 50, and then the soft resin material is molded into the soft resin member. This is a process of injection molding into a mold.
This is a step of injecting a soft resin material into the cavity of the mold 60, and the soft resin material for injection molding is mainly a thermoplastic elastomer, such as a styrene elastomer, a vinyl chloride elastomer, an olefin elastomer, a urethane elastomer, Polyester elastomers, nitrile elastomers, polyamide elastomers, and fluorine elastomers may be used. However, in this embodiment, a styrene elastomer is employed.

Conventionally, injection molding of a soft resin member to a hard resin member has been impossible due to the molding temperature. If the temperature of the soft resin member is raised and injection molding is performed, the hard resin member will be deformed. Conversely, if the temperature is lowered and injection molding is performed, the soft resin member is often not completely fused, causing peeling. There was a high possibility of becoming an incomplete product.
More specifically, in the method for molding a plastic bonded product according to the present invention, the hard resin member 50 is injection-molded with the soft resin member 50 set in a range of 190 to 230 degrees on the hard resin member 40 obtained by injection-molding polypropylene. Is not deformed and can be reliably fused. This set temperature is the allowable temperature obtained as a result of the experiment when polypropylene is selected as the hard resin member and styrene elastomer is selected as the soft resin member. Is also possible.

In the present invention, in order to surely fuse the soft resin member 50 to the hard resin member 40, a finished product of the joined molded product 11 which is not separated or damaged by making the shape of the hard resin member a special structure. Making it feasible. When injection molding is performed in the soft resin member injection step 30, since the soft resin member is a fluid, various shapes of coating are possible depending on the shape of the hard resin member. As a product, the most important issue is that the soft resin member coated during use does not peel off from the hard resin member. To achieve this, a hole is provided in the periphery of the hard resin member to replace the soft resin member with the hard resin. At the same time as embedding in the member, the peripheral edge is covered from both the upper and lower sides and the end face, thereby realizing fusion that is difficult to peel off. As shown in FIG. 4, in order to realize this joining, a through hole 42 is drilled in the periphery of the hard resin member 40, and the soft resin member flows into this hole, so that the hard resin member is more securely fused. It is possible to make it. It is also possible to provide another through hole 43 and allow the soft resin member to partially flow.
Furthermore, it is also possible to form a soft resin member on both sides only by providing a peripheral edge 44 whose peripheral edge is thinner than the center of the hard resin member and providing a hole 42 in the peripheral edge 44. It is.

  Next, the mold of the plastic contact composite product of the present invention will be described in detail. The mold 60 is divided into a fixed side 60a and a movable side 60b. In this embodiment, the hard resin member 40 is arranged on the movable side with a cavity (gap) serving as a cavity. The movable mold is provided with a fixture 62 for securely fixing the hard resin member, and in this embodiment, four fixtures 62 are arranged to securely fix the hard resin member. This fixing tool is erected in a substantially horizontal direction toward the cavity of the mold on the fixed side, and engages with and fixes the hole 42 provided in the hard resin member 40.

Further, the movable mold 60b is formed with a convex holder 66 for pressing the hard resin member 40 from the side surface to prevent the hard resin member from being deformed or displaced during injection molding of the soft resin member. Yes. If injection molding is performed without providing a holder, the hard resin member may also be deformed and misaligned. This has the effect of preventing this and reducing the defect rate.
Further, the movable side mold 60b has a burr prevention pressing portion 64 that presses the hard resin member in the direction of the fixed side mold from the back surface in order to prevent the burr of the soft resin member joined from the back surface to the front surface. There are several. When the soft resin member having the shape disclosed in FIG. 4 is joined only to the periphery, pressing from the back surface prevents the soft resin member from being joined to unnecessary portions of the surface. It becomes possible to do.

  Furthermore, in order to peel the plastic contact product molded after the completion of the injection molding without causing damage, a projecting device 68 for projecting the pin in the horizontal direction by an arbitrary operation is provided. In this embodiment, a protrusion device 68 is provided inside the burr prevention pressing portion in the vicinity of the gate, and when the protrusion device is protruded by this protrusion device, the plastic contact product is peeled off obliquely, so that the air can be easily separated from the soft resin member. It can be easily taken out by flowing between the molds. In the present invention, since the elastomer is used for the soft resin member, the tensile strength in the horizontal direction is very strong. Therefore, it can be easily taken out by forcibly providing the gap.

Next, the method for molding a plastic contact composite product of the present invention will be described in detail by operating procedures.
First, injection molding is performed and a stable hard resin member 40 is set on the movable mold 60b. The hard resin member of this embodiment is a member molded from polypropylene, is set thin, has a peripheral edge with a plurality of holes, and is securely fixed to the movable mold. Four holes into which the fixtures are inserted are formed. A fixing tool is inserted into these four holes, and fixed securely so as not to move during molding.

Further, in this mold, there are provided three holders for holding the hard resin member from the side surface, and the holder comes into contact with the side surface by being securely fixed. In addition, the burr preventing portion is in contact with the back surface.
Next, injection molding of the soft resin member is performed in this state. In this embodiment, a styrene elastomer is used. This is because by setting the styrene-based elastomer at 190 to 230 degrees, the hard resin member does not melt and can be reliably bonded. A soft resin member is injected from the gate of the mold onto the fixed hard resin member. At that time, the injected soft resin member 50 is not only bonded to the entire back surface of the hard resin member 40 but also flows into the peripheral surface through the peripheral hole 42 and covers the peripheral edge. When covering the periphery, the burr prevention pressing tool 64 provided on the movable mold is pressed against the fixed mold in the vicinity of the periphery, so that the soft resin member does not spread from the periphery without fail. It is possible to join only.
Since the soft resin member 50 is fixed from the back surface to the front surface by the peripheral hole 42, there is an effect of preventing the soft resin member from being peeled off from the hard resin member after molding, rather than a structure in which the back surface is simply joined to the front surface. .

The plastic contact synthesized product in which the hard resin member 40 and the soft resin member 50 are joined after the injection molding is in a state of being in close contact with the movable side mold. Although it is possible to forcibly pull it off by human power, there is a risk of damaging a soft resin member that is not stable.
In addition, the elastomer used in this example may not be easily peeled off when in close contact, but can be easily peeled off by inflowing air, similar to the suction cup. Therefore, in this embodiment, two parts of the burr prevention pressing tool provided in the vicinity of the gate are set to be hollow, and a protruding device having a pin provided therein is provided, so that it can be protruded arbitrarily or automatically, and the plastic contact product. Can be easily taken out by injecting air and injecting air.

  In this embodiment, the plastic resin composite product is manufactured by injecting the soft resin member with the gate 70 provided in the side surface direction of the hard resin member 50. However, the structure in which the gate is injected from the center of the back surface of the hard resin member. By doing so, it is possible to surely form.

Flow chart showing the steps of molding method for plastic-plastic joint molding Top view of mold for molding plastic joint molding Top view of mold for molding plastic joint molding A perspective view of a hard resin member mounted on a mold of a soft resin member Plan view of another embodiment of the same rigid resin member Partial sectional view of hard resin member

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Molding method of plastic joint molding 11 Joint molding 20 Hard resin member arrangement | positioning process 30 Soft resin member injection | emission process 40 Hard member 42 Through-hole 43 Through-hole 44 Peripheral part 50 Soft resin member 60 Mold 60a Fixed side metal mold | die 60b Movement Side mold 62 Fixing tool 64 Anti-burr pressing part 66 Holding tool 68 Protruding device 70 Gate

Claims (14)

In a molding method of a plastic bonded product that joins a soft resin member to a hard resin member,
A hard resin member placement step of placing the molded hard resin member in a mold for molding the soft resin member;
A soft resin member injection step of injecting the soft resin member into the mold cavity;
A method for molding a plastic bonded product, comprising:   2. The molding of a plastic bonded product according to claim 1, wherein in the step of injecting the soft resin member into the mold, the resin temperature of the soft resin member to be injected is set to 170 degrees to 230 degrees. Method.   The method for molding a plastic bonded product according to claim 1, wherein in the soft resin member injection step, the peripheral edge portion of the hard resin member is coated with the soft resin member.   The hard resin member includes a hard vinyl chloride resin, an olefin resin including polypropylene (PP) / polyethylene (PE), a styrene resin including polystyrene (PS) / acrylonitrile butadiene styrene (ABS), and a polycarbonate (PC). -It is characterized by injection molding of a thermoplastic resin material such as polycarbonate resin including polycarbonate and ABS alloy resin, and also terephthalate resin including polyethylene terephthalate and polybutylene terephthalate, or a thermosetting resin resin material. The method for forming a plastic bonded product according to claim 1.   The soft resin member is a soft vinyl chloride resin or a thermoplastic elastomer including a styrene elastomer, a vinyl chloride elastomer, an olefin elastomer, a urethane elastomer, a polyester elastomer, a nitrile elastomer, a polyamide elastomer, and a fluorine elastomer. The method for molding a plastic bonded product according to claim 1, wherein:   The method for molding a plastic bonded product according to claim 1, wherein the hard resin member has one or a plurality of holes formed in a peripheral edge.   The method for molding a plastic bonded product according to claim 1, wherein the hard resin member is provided with a peripheral edge portion formed thinner than a main body at a peripheral edge. 2. The hard resin member according to claim 1, wherein one or a plurality of holes penetrating the hard resin member are formed in order to securely attach the hard resin member to a mold for molding the soft resin member. Molding method for plastic bonded products.   The mold for injection molding of the soft resin member is a mold for a molding machine, and a thin rod-shaped fixture for fixing the hard resin member to the mold is a cavity of the mold for molding the soft resin member ( A mold for molding a plastic bonded product, characterized in that one or a plurality thereof are erected in the horizontal direction toward the cavity).   The mold for injection molding of the soft resin member has a cavity around the periphery of the hard resin member in order to prevent the hard resin member from being deformed or displaced due to pressure applied in the mold during the pressure injection of the soft resin member. A mold for molding a plastic bonded product, characterized in that one or a plurality of convex holders that are pressed and held on the side are erected in a horizontal direction toward a cavity (hollow part).   The mold for injection molding of the soft resin member is formed on the end of the hard resin member in order to prevent the occurrence of excessive burrs on the edge generated when the soft member is coated on the periphery of the hard resin member. One or a plurality of convex deburring prevention pressing tools that are in contact with and pressed against the back surface of the portion not covered in the vicinity of the portion are erected in the horizontal direction toward the cavity (cavity portion). Mold for molding. In the mold for injection molding of the soft resin member, the molded product is protruded obliquely by an arbitrary operation in order to peel the plastic joint molded product molded after the injection molding without damaging the mold. 12. A mold for molding a plastic joint molded product according to claim 9, wherein a projecting device for projecting the pin in the horizontal direction is provided in the vicinity of the gate.   The gate for injecting the soft resin member to the upper side, the side surface direction, or the lower side of the mold is formed so that the soft resin member can be injected from a lateral direction of the hard resin member installed in the mold. A mold for molding a plastic bonded product according to 9 to 11.   The method for molding a plastic bonded product according to claim 1, wherein the soft resin member is injected into the center of the mold so that the soft resin member can be injected from the center of the coated surface of the hard resin member installed in the mold. 12. A mold for molding a plastic bonded product according to claim 9, wherein a gate is formed.

Images