JP2008221317A - Method and apparatus for manufacturing duplex structure formed body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To continuously manufacture a duplex structure formed body with excellent accuracy capable of arbitrarily forming the atmosphere of a sealed space in a vacuum or the like by automatically forming the sealed space blocked from the outside between both formed bodies in a joining step of an exterior formed body with an interior formed body. <P>SOLUTION: An interior formed body 2 and an exterior formed body 3 keep a fitting state with a predetermined space therebetween. A space 19 is made to communicate with an internal space 23 of a contracted die assembly 13 to pass a second contracted die part 36 of the contracted die assembly 13 therethrough while keeping a sealed state from the outside. An opening end of the exterior formed body is contracted, and the interior formed body is joined with the exterior formed body to obtain a duplex structure formed body 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a manufacturing method and a manufacturing apparatus for a double structure molded body such as a double structure container that is required to have heat retention, cold insulation, heat insulation, and the like.

  A double-structured container made of a double structure of an outer container and an inner container in order to enhance the heat insulation, cold insulation and heat insulation of the container is known, for example, as a beverage container, a metal can, an aerosol can, a thermos bottle, a mug, etc. . In the double structure molded body, for example, in order to enhance the heat insulation function, it is desirable that the number of contact portions between the inner container and the outer container is as small as possible, and a vacuum state is provided between the two. However, it is impossible to hold the inner container in a completely non-contact state with the outer container, and the inner container and the outer container are usually joined at the opening end. As a method for joining the double-structured container, first the diameter of the open end of the outer container is reduced to the approximate outer dimension of the inner container, and the inner container is inserted into the outer container that has been reduced in diameter to reduce the diameter of the outer container. The interior container is held by contacting the open end of the interior container. In that case, use a container without a bottom wall as a normal outer container, insert a bottomed inner container from below and temporarily set both the inner and outer containers, then weld and join the mouth edges of both containers The gap between the two containers is evacuated and finally a bottom plate is fixed to the lower part of the outer container to form a vacuum chamber (see, for example, Patent Document 1).

On the other hand, in recent years, such a double structure can has been proposed for a canned can such as a bottomed beverage can (Patent Document 2). However, when both the outer container and the inner container are bottomed containers, when the inner container is inserted, the outer container cannot be normally inserted unless the air in the outer container escapes to the outside. The processed part cannot be inserted tightly into the opening end of the interior molded body, and can only be inserted in a loosely fitted state with a gap through which air escapes. Therefore, in order to make the heat insulation layer in the gap between the interior container and the exterior container into a vacuum state, as shown in Patent Document 2, the interior container and the exterior container must be joined in a vacuum chamber.
JP 2000-245630 A JP-A-3-254322

However, in order to join the open ends of the inner container and outer container in the vacuum chamber, a large vacuum facility is required and must be performed by a badge process, which hinders high-speed productivity and complicated equipment. And there is a problem of increasing the manufacturing cost.
Therefore, the present invention does not require an operation in a vacuum chamber, and automatically shuts off the gap between the two containers from the outside in the joining operation process of the bottomed outer container and the inner container and effectively creates a vacuum layer or the like. It is an object of the present invention to provide a method and an apparatus for manufacturing a double structure molded body that can form a closed gap and can manufacture a bottomed interior container and an exterior container accurately and continuously.

  In order to solve the above problems, the inventors first reduced the diameter of the opening end of the exterior molded body while inserting the interior molded body into the exterior molded body in a non-contact state. A method of manufacturing a double-structured molded body by bringing it into contact with the open end has been proposed (Japanese Patent Application No. 2006-1764). In this method, until the opening end of the exterior molded body collides with the drawing die, the air in the exterior molded body freely escapes from the opening when the interior molded body is fitted, and it is easily fitted without air compression. Thus, the present invention has an unprecedented excellent effect that the mouth portion of the interior container and the exterior container can be joined accurately and at high speed. As a result of further research, the present invention has found a method by which the above-mentioned proposal can be further improved to form a vacuum layer more effectively, and the present invention has been achieved.

  The method for producing a double structure molded body of the present invention according to claim 1 which solves the above-mentioned problems is a method for producing a double structure molded body having a gap between an interior molded body and an exterior molded body. The body and the exterior molded body are kept in a fitted state with a certain gap, and the gap between the interior molded body and the exterior molded body is communicated with the internal gap of the reduced diameter joining means to maintain a sealed state with the outside. However, it is characterized by passing the reduced-diameter mold portion of the reduced-diameter joining means and reducing the diameter of the opening end of the exterior molded body to join the interior molded body and the exterior molded body.

  According to a second aspect of the present invention, in the method for manufacturing a double structure molded body according to the first aspect, an inner molding is performed by passing the reduced diameter mold portion while exhausting an internal gap of the reduced diameter joining means. The gap between the body and the exterior molded body is vacuum-treated to obtain a vacuum heat insulating double structure molded body. Further, the invention according to claim 3 is the method for producing a double structure molded body according to claim 1, wherein the inner diameter of the reduced diameter joining means is pressed while passing through the reduced diameter mold part. The gap between the interior molded body and the exterior molded body is subjected to pressure treatment to obtain a positive pressure dual structure molded body. Further, the invention of claim 4 is the method for producing a double structure molded body according to claim 1, wherein a refrigerant is provided in the gap between the interior molded body and the exterior molded body via the internal gap of the reduced diameter joining means. A functional double structure molded body is obtained by filling any one of a heating medium and other fillers.

  The invention according to claim 5 is the method for producing a double structure molded body according to any one of claims 1 to 4, wherein the outer peripheral surface of the exterior molded body is brought into close contact with the reduced diameter joining means, The gap between the exterior molded bodies and the internal gap of the reduced diameter joining means are communicated in a sealed state. The invention according to claim 6 is the method for producing a double structure molded body according to any one of claims 1 to 5, wherein both the interior molded body and the exterior molded body are formed of a bottomed molded body. It is. On the other hand, the invention according to claim 7 is the method for producing a double structure molded body according to any one of claims 1 to 5, wherein one end of the interior molded body and the exterior molded body is joined in advance, or is seamless and integrated. It is characterized by becoming.

  An apparatus for manufacturing a dual structure molded body according to an eighth aspect of the present invention is a manufacturing apparatus for a dual structure molded body having a gap between an interior molded body and an exterior molded body, wherein the interior molded body is fitted into the exterior molded body. An internal molded body holding means for holding the inner molded body, a displacement means for integrally displacing the internal molded body held by the holding means and the exterior molded body held with a certain gap in the axial direction, the displacement means The body portion of the exterior molded body is reduced in diameter and processed to be joined to the interior molded body held by the interior molded body holding means. The gap between the interior molded body and the exterior molded body and the internal gap surrounded by the reduced diameter joining means are communicated with each other in a sealed state.

The invention according to claim 9 is the dual structure molded body manufacturing apparatus according to claim 8, wherein the reduced diameter joining means includes a sealing means having an inner diameter slightly smaller than an outer diameter of the exterior molded body, and exterior molding. It is a reduced-diameter die assembly comprising a combination with a reduced-diameter mold part that reduces the diameter until the body is in close contact with the interior molded body.
The invention according to claim 10 is characterized in that the sealing means is a reduced diameter die, and the invention according to claim 11 is that the sealing means is an elastic body whose diameter is increased by contact with an exterior molded body. It is characterized by. Furthermore, the invention according to claim 12 is the dual structure molded body manufacturing apparatus according to any of claims 8 to 11, wherein the reduced diameter joining means includes an internal space surrounded by the reduced diameter joining means and the space. The gap between the interior molded body and the exterior molded body communicating with the exhaust is connected to the exhaust means, the pressurizing means, or the filler supply means via a path formed in the base. .

  The invention according to claim 13 is the dual structure molded body manufacturing apparatus according to any one of claims 8 to 12, wherein the displacement means is configured integrally with an exterior molded body chuck that holds the exterior molded body, and It comprises transmission means for transmitting displacement force to the interior molded body holding means. Furthermore, the invention according to claim 14 is the dual structure molded body manufacturing apparatus according to any one of claims 8 to 12, wherein the displacement means has one end of the interior molded body and the exterior molded body joined in advance. Alternatively, a mandrel holding a seamless pre-double structure molded body is displaced with respect to the reduced diameter joining means.

  According to the dual structure molded body manufacturing method and the dual structure molded body manufacturing apparatus of the present invention, the gap between the interior molded body and the exterior molded body and the internal gap of the reduced diameter joining means are communicated with each other so as to be sealed from the outside. Passing through the reduced-diameter mold part of the reduced-diameter joining means while maintaining the same, the opening end of the exterior molded body is reduced in diameter to join the interior molded body and the exterior molded body, so the interior molding automatically before joining The gap between the body and the exterior molded body can be shut off from the outside, and the gap is connected to the vacuum source (Claim 2), the pressure source (Claim 3), the refrigerant, the heating through the internal gap of the diameter-reducing means. By communicating with a medium or other filler supply source (Claim 4), a refrigerant or the like can be easily placed in a vacuum heat insulating double structure, a positive pressure double structure molded body, or a gap between an interior molded body and an exterior molded body. Can be obtained. And since the supply path to these supply sources can be provided in the base which is a fixing member, it can be easily formed, and the gap between the interior molded body and the exterior molded body is surely brought into a desired state. Can do. And since a joining operation | work can be performed in air | atmosphere without requiring a vacuum chamber etc., it can process continuously and can manufacture with sufficient production efficiency. Further, when the interior molded body and the exterior molded body are fitted together, they can be easily and reliably fitted without air compression, and high-speed and accurate assembly can be performed.

  Further, according to the invention of claim 5, the diameter reduction joining is performed while maintaining the opening of the gap between the interior molding and the exterior molding only by moving the outer peripheral surface of the exterior molding along the diameter reduction joining means. It is possible to communicate with the internal gap of the means in a sealed state. In addition, since it is possible to automatically form a sealed space in a single step and a joining step, it is excellent in high-speed productivity. In the present invention, a bottomed molded body can be adopted for both the inner and outer molded bodies. According to the invention of claim 13, the interior molded body and the exterior molded body can be positioned so as to reliably form a desired gap between the interior molded body and the exterior molded body, and the state is maintained. Since both the molded bodies can be moved in the axial direction while the exterior molded body can be joined to the interior molded body, a product with a uniform gap can be obtained. According to the method according to claim 7 and the apparatus according to claim 14, the present invention is also applicable to a case in which one end of the interior molded body and the exterior molded body is joined in advance or is a seamless double structure molded body. it can. And according to invention of Claims 9-11, it can implement with the very simple apparatus using a shaping | molding die. According to the invention of claim 13 or claim 14, since the gap can be provided in the base that is a fixed member, a path for supplying a filling such as vacuum, pressurization or refrigerant can be easily and arbitrarily set. It can form in a magnitude | size and can make the clearance gap between an interior molded object and an exterior molded object into a desired state reliably.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic view showing a dual structure molded body manufacturing apparatus according to an embodiment of the present invention, but the dual structure molded body manufacturing apparatus of the present invention is not limited to this embodiment. The dual structure molded body manufacturing apparatus 1 according to the present embodiment moves up and down by holding a mandrel 11 as an interior molded body holding means for holding an interior molded body, and holding the exterior molded body by aligning the mandrel and the axis. A joining head 12 as a displacement means, and a diameter-reducing means for reducing the diameter of the opening end of the exterior molded body held by the joining head and joining the end of the interior molded body held by the mandrel. A reduced diameter die assembly 13 is provided as a main part. In this embodiment, the joining head 12 is moved up and down to insert the exterior molded body 3 into the interior molded body 2 held by the mandrel 11. However, the mandrel may be moved up and down, or both It may be moved up and down, and the arrangement is not limited to the vertical direction but may be horizontal, and is not limited to this embodiment. Further, a plurality of sets of the joining head, mandrel, and reduced diameter die assembly may be arranged on a turret type rotating body, or may be arranged at predetermined positions.

  The upper part of the mandrel 11 is an interior molded body fitting support part 16 having an outer diameter with which the interior molded body 2 is fitted, and the lower part is slightly smaller in diameter than the interior molded body fitting support part. The formed shaft portion 17 is fitted to the base 15 through a bearing 18 so as to be vertically slidable, and the lower portion thereof is connected to a drive device such as a cylinder device or a cam (not shown). Yes. The bearing 18 is free to slide in the axial direction of the mandrel 11, but a gap (hereinafter referred to as an internal gap) 19 between the mandrel 11 formed above the bearing and a reduced-diameter die described later is evacuated. At this time, the shaft is sealed with a suitable shaft seal 20 so that external air does not flow through the internal gap. Further, in this embodiment, an auxiliary member 21 extending in the diametrical direction is formed to project from the lower portion of the shaft portion 17 of the mandrel 11, and a transmission rod 22 is formed to project in the vertical direction at the end of the auxiliary member. The transmission rod extends through the base 15 to the upper portion, and abuts on an abutting rod 25 protruding from the joining head 12. The abutting position of the transmission rod 22 and the abutting rod 25 is abutted when the joining head descends as described later and the fitting position between the interior molded body and the exterior molded body reaches a predetermined position. Thereafter, the lowering driving force of the joining head 12 is transmitted to the mandrel 11 via the abutting rod 25, the transmission rod 22, and the auxiliary member 21, and thereafter the joining head 12 and the mandrel 11 are lowered synchronously while the position is fixed. It is like that.

  The joining head 12 can be driven up and down in the axial direction by an appropriate driving device (not shown), and has an exterior molded body chuck 26 that holds the bottom of the exterior molded body by vacuum suction. In the present embodiment, the outer molded body chuck 26 is connected to a vacuum pump via a vacuum path 27 so as to vacuum-suck the outer molded body 3, and ON / OFF control of connection with a vacuum source is performed. The molded body can be held and released by suction. The joining head body 28 is provided with the aforementioned abutting rod 25 that hangs down on the axis of the transmission rod 22. Reference numeral 29 in the figure denotes the axis of the mandrel 11 when the joining rod 12 is lowered and the interior molded body 2 and the exterior molded body 3 are joined by the reduced diameter die assembly 13 provided on the base 15. This is a guide ring that guides the shaft center of the joining head 12 so as not to be shaken, and is fitted to the outer peripheral portion of the inlet guide 33 provided in the reduced diameter die assembly 13. However, the guide ring 29 is not necessarily required.

  The reduced-diameter die assembly 13 constituting the reduced-diameter joining means includes a first reduced-diameter die 31 serving as a sealing means on the upper side, and a reduced-diameter mold part for reducing the diameter until the outer molded body is in close contact with the interior molded body. The inlet guide 33 is integrally assembled in a cylindrical shape above the second reduced diameter die 32 and the first reduced diameter die 31 and is fixed to the base 15 integrally. The first reduced diameter mold part 35 constituting the light reduced diameter mold part of the first reduced diameter die 31 and the second reduced diameter mold part 36 constituting the reduced diameter joining mold part are arranged at a predetermined interval, A mandrel outer peripheral surface and an internal gap 23 are formed, and a vacuum chamber for forming a vacuum in a gap 19 between an interior molded body and an exterior molded body, which will be described later, is formed.

  The first reduced diameter die 31 is for excluding air from the gap between the interior molded body and the exterior molded body when the interior molded body 2 and the exterior molded body 3 reach a fitting state in which a predetermined gap 19 is formed. In order to form the vacuum chamber prior to the start of the joining process, the outer molded body is subjected to light reduction processing. By subjecting the exterior molded body to light diameter reduction so as not to contact the interior molded body, the inner peripheral surface of the first reduced-diameter mold portion of the reduced diameter die and the outer peripheral surface of the exterior molded body are brought into close contact with each other. As a result, a vacuum chamber is formed in which the internal gap 23 of the reduced diameter die assembly and the gap 19 between the interior molded body and the exterior molded body communicate with each other, and the vacuum path (path) in which the air in the vacuum chamber is formed in the base 15. By evacuating through a vacuum pump (not shown) through 37, the gap 19 between the interior molded body and the exterior molded body can be automatically and easily evacuated prior to joining. Accordingly, the inner diameter of the first reduced-diameter die portion 35 of the first reduced-diameter die 31 is only required to be able to reduce the diameter of the exterior molded body so as to maintain the pressure contact state with the outer peripheral surface of the exterior molded body, and is slightly smaller than the outer diameter of the exterior molded body. The inner diameter may be as small as possible. The second reduced diameter die portion 36 of the second reduced diameter die 32 presses the opening end of the exterior molded body against the outer peripheral surface of the interior molded body in order to join the end portions of the interior molded body and the exterior molded body. It has an inner diameter that can be reduced.

The dual structure molded body manufacturing apparatus of the present embodiment is configured as described above, and the embodiment of the dual structure molded body manufacturing method using the apparatus of the embodiment is described with reference to the schematic diagram of FIG. explain.
The interior molded body 2 is supplied to the mandrel 11 by an appropriate interior molded body supply device at the interior molded body supply position. At that position, the mandrel 11 is positioned above the position shown in FIG. 1, and as shown in FIG. 3A, the position where the interior molded body fitting support portion 16 protrudes above the reduced diameter die assembly 13. It is in. On the other hand, the outer molded body 3 is already held in the chuck 26 of the joining head 12 by vacuum suction. In this state, the joining head 12 is lowered by an appropriate driving device, so that the exterior molded body 3 is fitted to the outer peripheral portion of the interior molded body 2 and when the joint head 12 reaches the position shown in FIG. The rod 25 comes into contact with the transmission rod 22 integral with the mandrel 11, and thereafter the axial relative displacement of the exterior molded body with respect to the interior molded body is prohibited, and the interior molded body and the exterior molded body are lowered integrally. Therefore, the gap between the interior molded body and the exterior molded body is kept constant.

  When the joining head 12 is further lowered from this state, the mandrel 11 is also lowered integrally, the lower end of the exterior molded body 3 passes through the guide ring 33 of the reduced diameter die assembly 13, and the first reduced diameter die 31. The opening end portion of the exterior molded body is slightly reduced in diameter by lowering while abutting against the first reduced diameter mold portion 35, and the outer peripheral surface of the exterior molded body and the inner peripheral surface of the first reduced diameter mold portion 35 Close. As a result, the upper opening end of the reduced diameter die assembly is closed, and the gap 23 between the outer peripheral surface of the mandrel and the inner peripheral surface of the reduced diameter die assembly and the gap 19 between the interior molded body and the exterior molded body communicated. A vacuum chamber is formed. Accordingly, by exhausting the air in the vacuum chamber through the vacuum path 37 formed in the base 15, the inside of the gap 19 between the interior molded body and the exterior molded body can be set to a predetermined degree of vacuum (FIG. 1). And FIG. 3 (b)). Then, when the joining head 12 and the mandrel 11 are further lowered integrally while being maintained in a vacuum state via the vacuum path, the opening end portion of the exterior molded body becomes the second reduced diameter portion of the second reduced diameter die. 36, the diameter of the outer molded body was further reduced, and as shown in FIG. 3C, the opening end of the exterior molded body was in close contact with the opening end of the interior molded body, and the interior molded body and the exterior molded body were joined. A joint 4 is formed. Therefore, the gap 19 between the interior molded body and the exterior molded body after joining is maintained in a vacuum state.

  As described above, the double structure molded body 5 is formed by joining the interior molded body and the exterior molded body. Thereafter, the mandrel 11 is lifted, and the joined double structure molded body is detached from the mandrel by an appropriate knockout means and conveyed to the next step. For example, the knockout means may be configured to provide an air path that opens to the mandrel top surface in the axial direction of the mandrel, and to supply the compressed air when the dual structure molded body is detached from the mandrel and forcibly separate it. Alternatively, it may be grasped and taken out from outside by an appropriate grasping means.

FIG. 4 shows another embodiment of the method and apparatus for producing a double structure molded body of the present invention. In the present embodiment, the same parts as those in the above embodiment are denoted by the same reference numerals, and only different points will be described.
In the double structure molded body manufacturing apparatus 50 according to the present embodiment, the reduced diameter die assembly 51 is replaced with the first reduced diameter die of the above embodiment, and a molding die for lightly reducing the diameter in the middle of the exterior molded body in the height direction. A split mold 52 having a portion 53 is provided. Therefore, in this embodiment, the split mold 52 is in an open state until the interior molded body 2 and the exterior molded body 3 are fitted with a predetermined gap, as shown in FIG. When the interior molded body 2 and the exterior molded body 3 are in a fitted state with a predetermined gap, the split mold 52 is closed, and as shown in FIG. By doing so, the split mold and the outer molded body are in close contact with each other, and a sealed chamber is formed from the internal gap 54 of the reduced diameter die assembly 51 to the gap 19 between the inner molded body and the outer molded body. Thereafter, the sealed chamber is communicated with a vacuum source (not shown) before the exterior molded body is joined to the interior molded body, and the space between the interior molded body and the exterior molded body is exhausted from the sealed chamber. 19 is in a vacuum state.

  The diameter reduction processing position by the split mold 51 may be an arbitrary position in the height direction of the exterior molded body as long as the split mold and the exterior molded body are in close contact with each other and the gap between the reduced diameter die assemblies can be sealed. Thereafter, as in the above-described embodiment, the joint head and the mandrel are integrally lowered so that the opening end portion of the exterior molded body comes into pressure contact with the second reduced-diameter mold portion 36 of the second reduced-diameter die 32, and the exterior molded body. The outer molded body 3 is brought into close contact with the interior molded body 2, and the interior molded body and the exterior molded body are joined (see FIG. 10C). Next, as shown in FIG. 4D, the split mold 52 is opened, the mandrel is raised, and the double structure molded body 55 is taken out from the mandrel (see FIG. 4D).

FIG. 5 shows still another embodiment of the method and apparatus for producing a dual structure molded body of the present invention. In the present embodiment, the same parts as those in the above embodiment are denoted by the same reference numerals, and only different points will be described.
The dual structure molded body manufacturing apparatus 60 of the present embodiment is provided with a mandrel 61, which is an internal molded body holding means for inserting and inserting an internal molded body, different from the above-described embodiment, and a reduced diameter die assembly. The outer molded body is displaced from the upper side or the lower side with respect to 62 to reduce the diameter. In the present embodiment, the preliminary double structure molded body 67 shown in FIG. 5A, in which the bottomed molded body is integrally formed by a known processing method such as reverse drawing, is fitted to the mandrel 61, and the mandrel 61 is compressed. By displacing with respect to the radial die assembly 62, joining is performed. The preliminary double structure molded body may be formed by previously joining an exterior molded body 66 having both ends open to the interior molded body 65 by welding, bonding, winding, etc. at one end of the open end. It can be easily obtained by a technique.

  As in the case of the above-described embodiment, the joining process is performed by raising the mandrel from the state of FIG. 5A, so that the lower end opening edge of the outer molded body is the first reduced diameter die portion 35 of the first reduced diameter die 31. , The outer reduced surface of the outer molded body and the first reduced diameter die are in close contact with each other, and the internal gap of the reduced diameter die assembly is sealed by the preliminary double structure molded body 67. Become. In this state, by exhausting the cylindrical space of the reduced diameter die assembly with a vacuum pump, the gap between the interior molded body and the exterior molded body is also exhausted, and a predetermined degree of vacuum can be obtained ((b) in the figure). ). When the mandrel further rises in this state, it abuts on the second reduced diameter portion 36 of the second reduced diameter die 32 and is reduced in diameter as shown in FIG. The end portion is joined to the outer peripheral surface of the interior molded body to form a joint portion 68, a vacuum heat insulation double structure molded body 64 having a vacuum between the interior molded body and the exterior molded body is manufactured, and the mandrel is lowered again. Thus, the double structure molded body is taken out from the reduced diameter die assembly 62. In the present embodiment, the reduced diameter die assembly is disposed above the mandrel so that the mandrel rises from below, but the reduced diameter die assembly is disposed below as in the above embodiments, The mandrel may be displaced downward to reduce the diameter.

  In each of the above embodiments, when the double structure molded body is a can body container, if the joint portions 4 and 68 are formed to a length that can form a flange portion for fastening the can lid, the next step By flanging the joint, the can lid can be tightened after filling the contents, and a can having a barrel and a bottom having a double structure can be obtained.

  Although various embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various design changes can be made within the scope of the technical idea. For example, in each of the embodiments described above, the reduced diameter die assembly is formed of the first reduced diameter die and the second reduced diameter die as separate members, but may be formed integrally with the same member. In addition, when the exterior molded body is fitted into the reduced diameter die assembly, the exterior molded body is lightly reduced with the reduced diameter die in order to seal the space of the reduced diameter die assembly, thereby forming the die and the exterior molding. The body is tightly closed and sealed, but the sealing means of the molding space is not necessarily limited to the diameter reduction by the diameter reducing die, and for example, various sealing materials such as O-ring, rubber, metal packing, etc. should be used for sealing. Is also possible.

FIG. 6 shows an embodiment of the method and apparatus for producing a dual structure molded body of the present invention when a rubber seal (seal material) that is an elastic body is used as the sealing means. In the present embodiment, the same parts as those in the above embodiment are denoted by the same reference numerals, and only different points will be described.
The dual structure molded body manufacturing apparatus 70 of the present embodiment is an exterior molded body provided above the reduced diameter mold portion 72 as a sealing means having an inner diameter slightly smaller than the outer diameter of the outer molded body 75. The sealing means main body 73 having an inner diameter slightly smaller than the outer diameter of 75 is provided with a ring-shaped rubber seal 74 having an inner diameter slightly protruding on the inner peripheral surface of the sealing means main body 73. In this case, the outer molded body 75 has its tip directly on the upper surface of the rubber seal as shown in the figure so that the edge of the outer molded body 75 does not touch the upper surface of the rubber seal 74 when the tip is pushed down into the sealing means main body 73. It is desirable to form a reduced diameter tapered portion 76 that has a reduced diameter so that it does not strike.

  The apparatus of this embodiment is configured as described above, and the exterior molded body 75 and the interior molded body 2 are integrally lowered in the same manner as in the above embodiment (see FIG. 6A), and the tip of the exterior molded body 75 is formed. When the portion is fitted to the sealing means main body 73 and the diameter-reduced taper portion 76 passes through the rubber seal 74, the rubber seal is expanded against the elasticity by the contact pressure with the outer peripheral surface of the outer molded body 75 and sealed. This state is maintained until the tip of the exterior molded body is reduced in diameter by the reduced diameter mold portion and joined to the interior molded body (see (c) in the figure). Meanwhile, in the state shown in FIG. 5B, the internal gap 77, the outer molded body 75, and the gap 78 between the inner molded body 2 communicate with each other in the same manner as in the above embodiment to form a sealed space, and evacuation is performed. Thus, the gap 78 is joined while maintaining the vacuum state, and the vacuum heat insulating double structure molded body 79 can be obtained. After the joining, as shown in FIG. 4D, it is discharged from the reduced diameter joining means.

  In each of the above embodiments, the vacuum between the interior molded body and the exterior molded body is obtained by obtaining a vacuum heat insulation double structure molded body that is a heat insulating container, but the gap between the interior molded body and the exterior molded body In addition to the vacuum treatment, it is possible to make the pressurized state, or to fill a heating medium or a refrigerant, and to fill other fillings.

  For example, by connecting the path 37 to a compressed air supply source in the apparatus shown in FIG. 1, the gap between the interior molded body and the exterior molded body can be brought into a positive pressure state, and the pressure resistance (rigidity) of the exterior molded body. Can be increased. As a result, the exterior molded body can be formed of a thin-walled material, and an air-insulated double structure can body made of a low-cost thin-walled metal material can be obtained. In addition, by filling the gap between the interior molded body and the exterior molded body with, for example, a refrigerant, after cooling in the refrigerator while filling the contents such as beverages, it does not easily warm after taking out from the refrigerator, and cools for a long time. A functional double structure molded product capable of maintaining the state can be obtained.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for the production of various containers such as beverage containers, various cans, art cans, aerosol cans, thermos bottles, mugs, etc., as a double structure molded body having an exterior molded body and an interior molded body. These double structure molded products are not limited to metal, but can be applied to plastic, paper, and composite materials thereof.

It is a principal part cross-sectional schematic diagram of the manufacturing apparatus of the double structure molded object concerning embodiment of this invention. It is the principal part expanded sectional schematic of the manufacturing apparatus of the double structure molded object shown in FIG. 1 in the state which joined the exterior molded object to the interior molded object. It is process drawing which shows the manufacturing process of the manufacturing method of the double structure molded object which concerns on embodiment of this invention. It is process drawing which shows the manufacturing process of the manufacturing method of the double structure molded object which concerns on other embodiment of this invention. It is process drawing which shows the manufacturing process of the manufacturing method of the double structure molded object which concerns on further another embodiment of this invention. It is process drawing which shows the manufacturing process of the manufacturing method of the double structure molded object which concerns on further another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 50, 60, 70 Manufacturing apparatus 2 of double structure molded object 2, 65 Interior molded object 3, 66, 75 Exterior molded object 4, 68 Connection part 5, 55, 79 Dual structure molded object 11, 61 Mandrel 12 Joining Heads 13, 52, 62 Reduced-diameter die assembly 15 Base 16 Interior molded body fitting support parts 19, 40, 78 Clearance 20 Shaft seal 22 Transmission rods 23, 54, 77 Internal clearance 25 Colliding rod 26 Chuck 28 Joining head Main body 31 First reduced diameter die 32 Second reduced diameter die 35 First reduced diameter part 36 Second reduced diameter part 37 Vacuum path (path)
52 Split mold 53 Mold part 67 Preliminary double structure molded body 72 Reduced diameter mold part 73 Sealing means body 74 Rubber seal 76 Reduced diameter taper part

Claims (14)

  A method for producing a double structure molded body having a gap between an interior molded body and an exterior molded body, wherein the interior molded body and the exterior molded body have a certain gap to maintain a fitted state, and the interior molded body and The gap between the outer molded bodies is communicated with the inner gap of the reduced diameter joining means, and the opening end portion of the outer molded article is passed through the reduced diameter mold portion of the reduced diameter joining means while maintaining a sealed state with the outside. A method for producing a double-structured molded body, comprising reducing the diameter and joining the interior molded body and the exterior molded body.   The gap between the interior molded body and the exterior molded body is vacuum processed by passing the reduced diameter mold portion while exhausting the internal gap of the reduced diameter joining means to obtain a vacuum heat insulating double structure molded body The manufacturing method of the double structure molded object of Claim 1 characterized by these.   By pressing the internal gap of the reduced diameter joining means while passing through the reduced diameter mold portion, the gap between the interior molded body and the exterior molded body is pressurized to obtain a positive pressure double structure molded body. The manufacturing method of the double structure molded object according to claim 1 characterized by things.   The gap between the interior molded body and the exterior molded body is filled with any one of a refrigerant, a heating medium, and other fillers through the internal gap of the reduced diameter joining means, and a functional double structure molded body is obtained. The method for producing a double-structured molded article according to claim 1, wherein:   5. Any one of claims 1 to 4, wherein the outer peripheral surface of the outer molded body is brought into close contact with the reduced-diameter bonding means, whereby the gap between the inner molded body and the outer molded body and the internal gap of the reduced-diameter bonding means are communicated in a sealed state. A method for producing a double structure molded body according to claim 1.   The method for producing a dual structure molded body according to any one of claims 1 to 5, wherein the interior molded body and the exterior molded body are both bottomed molded bodies.   The method for producing a double structure molded body according to any one of claims 1 to 5, wherein one end of the interior molded body and the exterior molded body is joined in advance or is seamless.   An apparatus for manufacturing a double structure molded body having a gap between an interior molded body and an exterior molded body, the interior molded body holding means for holding the interior molded body so that the exterior molded body can be fitted, and held by the holding means Displacement means for integrally displacing the interior molded body and the exterior molded body held with a certain gap in the axial direction, and reducing the diameter of the body portion of the exterior molded body displaced by the displacement means, and interior molding It is composed of a reduced diameter joining means for joining with the interior molded body held by the body holding means, and the body portion of the exterior molded body is in close contact with the reduced diameter joining means before joining, so that the space between the interior molded body and the exterior molded body is An apparatus for manufacturing a double structure molded body, wherein the gap and the internal gap surrounded by the reduced diameter joining means are communicated in a sealed state.   The reduced-diameter joining means comprises a combination of a sealing means having an inner diameter slightly smaller than the outer diameter of the exterior molded body and a reduced-diameter mold portion for reducing the diameter until the exterior molded body is in close contact with the interior molded body. The apparatus for manufacturing a double structure molded body according to claim 8, which is a die assembly having a diameter.   The apparatus for producing a double structure molded body according to claim 9, wherein the sealing means is a reduced diameter die.   The apparatus for producing a dual structure molded body according to claim 9, wherein the sealing means is an elastic body whose diameter is expanded by contact with the exterior molded body.   The reduced diameter joining means includes a space surrounded by the reduced diameter joining means, and a gap between the interior molded body and the exterior molded body communicating with the space via a path formed in the base, exhaust means, pressure means, Or the manufacturing apparatus of the double structure molded object in any one of Claims 8-11 which comes to be connected with either of a filler supply means.   The double unit according to any one of claims 8 to 12, wherein the displacing means is formed integrally with an exterior molded body chuck for holding an exterior molded body and includes a transmission means for transmitting a displacement force to the interior molded body holding means. Structured body manufacturing equipment.   The displacing means is configured to displace a mandrel formed by holding a pre-double structure molded body in which one end of the interior molded body and the exterior molded body are joined or seamless with respect to the reduced diameter joining means. The apparatus for producing a double structure molded body according to any one of claims 8 to 12.

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