JP2009255321A - Insert molding method and insert molding machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an insert molding method which enables efficient insert molding requiring no press process, and an insert molding machine. <P>SOLUTION: Core cloth 22 is bonded on a decorative surface cloth 21 to form a cloth-made outer cover 20 having a double-layered structure, and the cloth-made outer cover 20 is mounted on a fixed mold 40 so as to turn the surface cloth 21 toward the fixed mold 40. Next, a movable mold 50 is pressed to the core cloth 22 of the cloth-made outer cover 20 and the cavity 51 of the movable mold 50 is subsequently filled with a molten resin (m). <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an insert molding method and apparatus capable of efficient insert molding that does not require a pressing step.

  Conventionally, a cover of a composite structure is formed by laminating a fabric and a plastic sheet, the cover of the composite structure is press-molded to form a press-molded cover, and then the press-molded cover is attached to a mold, and the mold There has been proposed a method of insert-molding a cabinet of an electronic device in which a molten resin is filled and insert-molded (see, for example, Patent Document 1).

  However, the conventional method has a problem such as an increase in equipment cost and running cost because a pressing process for pressing a composite structure formed by bonding a fabric and a plastic sheet into a predetermined shape is indispensable.

Further, in the conventional method, when a composite structure cover is insert-molded using an injection molding machine, wrinkles are generated in the fabric due to the flow pressure of the molten resin, or the plastic sheet is melted by the heat of the injection molding machine. Or, the cloth was pressed by the pressure and heat at the time of molding, causing problems such as the cloth having no texture.
JP 2007-176106 A

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an insert molding method and apparatus capable of efficient insert molding that does not require a pressing step. is there. Furthermore, an object of the present invention is to provide an insert molding method and apparatus in which defects such as wrinkles do not occur on the surface fabric of the cloth exterior cover during insert molding.

  In the invention according to claim 1 of the present application, a cloth outer cover is formed by attaching a cloth interlining to a front cloth for garnish, and the cloth outer cover is attached to the fixed mold. Insert molding characterized in that the mold is attached to the mold, and then the movable mold is pressed against the interlining side of the cloth outer cover, and then the molten resin is filled into the cavity of the movable mold. Is the method.

  The invention according to claim 2 of the present application is the insert molding method according to claim 1, wherein the pressing force of the cloth outer cover is adjusted by a bank-shaped pressing part provided around the cavity of the fixed mold. .

  The invention according to claim 3 of the present application is characterized in that, in claim 1 or 2, as the cloth exterior cover, an all-woven fabric cover in which a woven adhesive interlining is bonded to a surface fabric for garnishing is applied. This is an insert molding method.

  The invention according to claim 4 of the present application is the insert molding method according to claim 3, wherein a permanent adhesive type adhesive core in which adhesives are arranged in a certain size is applied as the adhesive core. is there.

  The invention according to claim 5 of the present application is the insert molding apparatus in which the cloth outer cover is held by the fixed mold and the movable mold, and the pressing force of the cloth outer cover around the cavity provided in the fixed mold. It is an insert molding device characterized by providing a bank-shaped pressing part that adjusts.

  The invention according to claim 6 of the present application is the insert molding apparatus according to claim 5, wherein the lateral width of the pressing part is adjusted according to the depth of the cavity.

  The present invention forms a multi-layered cloth exterior cover by laminating a cloth interlining to a surface cloth for garnishing, and the mold exterior cover is directed to the fixed mold. Then, the movable mold is pressed against the interlining side of the cloth outer cover, and then the molten resin is filled into the cavity of the movable mold. A pressing process for pressing into a shape is unnecessary, and insert molding can be performed more efficiently than before.

  In addition, the present invention eliminates the need for equipment and operators required for the pressing process, and accordingly it is possible to suppress equipment costs and labor costs. Furthermore, since the molten resin acts uniformly on the interlining side of the cloth exterior cover during insert molding, it has become possible to insert-mold a high-quality molded product free from defects such as wrinkles on the front fabric side.

  In particular, the method of the present invention is such that the pressing force of the cloth outer cover is adjusted by a bank-shaped pressing part provided around the cavity of the fixed mold, so that the cloth outer cover is adjusted by the pressing force of the male mold. However, since the cavity is drawn in accordance with the shape of the cavity of the fixed mold, defects such as wrinkles do not occur on the surface fabric.

  The present invention relates to an insert molding apparatus in which a cloth outer cover is held by a fixed mold and a movable mold, and a bank-like shape that adjusts the pressing force of the cloth outer cover around a cavity provided in the fixed mold. Since the press-cut portion is provided, the cloth outer cover is drawn in accordance with the shape of the cavity of the fixed mold by the pressing force of the male mold, so that defects such as wrinkles do not occur on the outer fabric.

  In addition, the present invention can adjust the width of the press-cut portion according to the depth of the female cavity, thereby enabling uniform pull-in of the cloth outer cover even with a deep product, and the front fabric side for garnishing It is now possible to follow the cloth exterior cover by preventing wrinkles.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In this embodiment, the case of insert molding a cabinet of a mobile phone will be described. However, the present invention is not limited to this, and can be applied to molding of the following products.

(1) Products such as ornaments for exterior covers of electronic devices such as mobile phones and replacement panels using cloth.
(2) Products that use cloth for appearance such as bags, bags, suitcases and accessories.
(3) Products such as garnished parts using cloth as interior parts for automobiles.
(4) Home appliances such as air conditioners and refrigerators, and products with festive decorations such as lighting equipment and furniture.
(5) Ornament molded parts using fabrics from other fields.

  As shown in FIG. 7, the mobile phone 10 includes an opening / closing part 11 and a body part 12, and the opening / closing part 11 and the body part 12 are connected to each other by a hinge part 13 so as to be opened and closed. A reception unit and a display unit are provided inside the opening / closing unit 11, and a sub display unit 14 for displaying time and the like is provided outside the opening / closing unit 11.

  The cabinet 15 that covers the opening / closing part 11 is of a front and back split type, and is formed by a resin base material (not shown) and a cloth exterior cover 20 affixed to the outer surface of the base material. The substrate is made of, for example, ABS, AS, PC (polycarbonate), or the like.

  As shown in FIG. 6, the cloth exterior cover 20 is an all-woven fabric cover having a two-layer structure in which a woven fabric interlining 22 is bonded to one side of a surface fabric 21 for garnishing. The interlining 22 may be bonded to one side of the front fabric 21 using an adhesive, but it is convenient to use a permanent adhesive type interlining. This adhesive interlining is obtained by applying a thermoplastic adhesive (synthetic resin) that exhibits adhesiveness by applying heat to a base fabric, and overlaying a surface fabric 21 for garnishing on the adhesive interlining. Then, for example, by pressing with a heating plate, the thermoplastic adhesive melts and the two are joined.

  As the base fabric of the adhesive interlining, for example, a woven fabric (for example, plain weave, satin weave, twill weave, etc.) using materials such as cotton, polyester, polynosic, and rayon is desirable. Further, the adhesive interlining is preferably one in which an adhesive is placed on the base fabric with a certain size.

  The adhesive is preferably an adhesive such as polyamide, polyvinyl chloride (PVC), polyethylene, ethylene vinyl acetate copolymer (EVA), or polyester.

  As the surface fabric, for example, a woven fabric, a knitted fabric, a non-woven fabric using cotton, hemp, silk, chemical fiber, or the like is desirable. In addition, the color and pattern of the front fabric are not particularly limited.

  As shown in FIG. 1, the insert molding apparatus 30 according to the present invention includes a mold 31 and an injection molding machine (not shown). The mold 31 includes a female mold 40 and a male mold 50, and the female mold 40 is mounted on an injection molding machine (not shown). On the other hand, the male mold 50 is attached to a piston (not shown), is advanced in the direction of arrow A and integrated with the female mold 40, is retracted in the direction of arrow B, and waits at the initial position.

  The female mold 40 includes a bank-shaped pressing part 42 around the cavity 41. This pressing part 42 can adjust the pressing force of the cloth exterior cover 20 by changing the lateral width W (see FIG. 5). Specifically, the lateral width W of the pressing part 42 is adjusted to be inversely proportional to the depth of the cavity 41.

  The male mold 50 includes a cavity 51 corresponding to the cavity 41 of the female mold 40, but includes a protruding portion 52 for forming an opening for the sub display unit 14 at the tip. ing. Further, the male mold 50 has a hot water reservoir 54 at an end surface 53 that presses the cloth exterior cover 20, and a runner 55 that communicates from the hot water reservoir 54 to the cavity 51. In addition, when forming the cabinet without the sub display part 14, the male type | mold without the protrusion part 52 is used.

  Further, the female metal mesh 40 has a nozzle hole 43 that faces the hot water pool portion 54 of the male metal mold 50.

  When insert molding a cabinet of a mobile phone, as shown in FIG. 1, the cloth outer cover 20 is placed on the end face of the female mold 40 with the face cloth 21 facing the female mold 40. Paste to. Then, the opening 44 of the cavity 41 of the female mold 40 is covered with the cloth exterior cover 20.

  Next, the male mold 50 is advanced in the direction of arrow A, and the end surface portion 53 of the male mold 50 is pressed against the pressing part 42 of the female mold 40. At this time, as shown in FIG. 2, the nozzle hole 43 on the female mold side communicates with the hot water reservoir 54 of the male mold 50, and the protrusion 52 of the male mold tip causes the cloth exterior cover 20 to be A part is pressed against the bottom 45 of the cavity 41 of the female mold 40.

  Next, when the molten resin m is injected into the nozzle hole 43 on the female mold side from an injection molding machine (not shown), the injected molten resin m is transferred from the nozzle hole 43 to the male mold side as shown in FIG. It flows into the cavity 51 on the male mold side through the hot water reservoir 54 and the hot water passage 55. The molten resin a flowing into the cavity 51 on the male mold side presses the interlining 22 side of the cloth outer cover 20, so that the cloth outer cover 20 moves back into the cavity 41 of the female mold 40 and finally. As shown in FIG. 3, the front fabric 21 for garnishing the cloth exterior cover 20 is pressed against the wall surface of the cavity 41 of the female mold 40.

  At this time, the cloth outer cover 20 is pulled into the cavity 41 of the female mold 40 according to the shape of the cavity 41 of the female mold 40 by the pressing force of the male mold 50, so The fabric 21 is free from defects such as wrinkles.

  After the male mold 50 is moved back to the initial position, the molded product removed from the mold, that is, the cabinet 15 of the cellular phone, has a peripheral portion 20a of the cloth outer cover 20 protruding as shown in FIG. At the same time, since the hole 16 for the sub display portion is covered with the cloth outer cover 20, a cutter (not shown) is inserted at the positions indicated by arrows a and b to cut off the extra cloth outer cover 20.

  Note that the cabinet 15 in FIG. 4 is exaggerated, so that it is different from the cross-sectional shape of an actual mobile phone cabinet.

It is a schematic block diagram of the insert molding apparatus which concerns on this invention. It is sectional drawing which shows a mode that the cloth exterior cover was pressed against the female metal mold | die with the male metal mold | die. It is sectional drawing which shows a mode that molten resin was filled in the metal mold | die. It is sectional drawing of the intermediate product which carried out insert molding. It is an expanded sectional view of the X section of FIG. It is sectional drawing of a cloth cover. It is a perspective view of the mobile phone by which cloth was covered.

Explanation of symbols

20 Fabric outer cover 21 Table cloth for garnishing 22 Fabric interlining 40 Fixed mold 50 Movable mold 51 Movable mold cavity m Molten resin

Claims (6)

  A fabric outer cover is formed by laminating a cloth interlining on a surface fabric for garnish, and this cloth exterior cover is attached to the mold with the surface fabric facing the fixed mold, Next, the insert molding method is characterized in that the movable mold is pressed against the interlining side of the cloth exterior cover, and then the molten resin is filled into the cavity of the movable mold.   The insert molding method according to claim 1, wherein the pressing force of the cloth outer cover is adjusted by a bank-shaped pressing part provided around the cavity of the fixed mold.   The insert molding method according to claim 1 or 2, wherein an all-woven fabric cover in which a woven adhesive interlining is bonded to a garnishing cloth is applied as the cloth exterior cover.   4. The insert molding method according to claim 3, wherein a permanent adhesive type adhesive core in which adhesives are arranged in a fixed size is applied as the adhesive core.   In an insert molding device in which a cloth outer cover is held by a fixed mold and a movable mold, a bank-shaped pressing part that adjusts the pressing force of the cloth outer cover is provided around a cavity provided in the fixed mold. An insert molding device characterized by that.   6. The insert molding apparatus according to claim 5, wherein the lateral width of the pressing part is adjusted according to the depth of the cavity.

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