JP2009279920A - Double injection molding method for incorporating insert, and insert incorporated type electronic product case manufactured by double injection molding method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a double injection molding method to manufacture a beautiful case free from peeling away of an insert. <P>SOLUTION: The double injection molding method employs a double injection molder which has first and second mold assemblies containing a fixed mold 100 and a movable mold 200, wherein the fixed mold includes a runner, the runner has a gate, and the movable molds of the first and the second mold assemblies are integrated. The first mold assembly is opened, an insert 400 is arranged in the movable mold 200 of the first mold assembly, the movable mold 200 of the first mold assembly is combined with the fixed mold 100, and a first injection liquid is injected in the first mold assembly. The first mold assembly is opened, an obtained primary injection-molded product is moved to the movable mold of the second mold assembly, the movable mold of the second mold assembly is combined with the fixed mold, a second injection liquid is injected in the second mold assembly, the second mold assembly is opened, and a completed injection-molded product is taken out. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method of double-injecting an outer case of an electronic product such as a portable terminal such as a mobile phone and a PDA, a desktop computer, and a notebook computer, and an outer case of the electronic product manufactured by the method. More specifically, the present invention relates to a double injection molding method in which an insert such as a manufacturer's logo is incorporated, and an external case of an electronic product with a built-in insert manufactured by the double injection molding method.

  Conventional exterior cases for electronic products such as desktop computers and notebook computers are generally produced by injection molding using a single mold. 2 and 3 show a front case 1 of a desktop computer and an upper case 10 of a notebook computer manufactured in this manner. The computer case manufactured by such a method is exposed to the exterior of the case as it is, so that the mechanical characteristics against external impact and contact are weak, and there is a limit to embody a beautiful design.

  Generally, the outer case of an electronic product is provided with various characters and symbols such as a manufacturer's logo, characters representing product specifications, etc., and such characters and symbols are emitted from the outer case of the electronic product. It is inserted into a mold at the time of molding and is usually referred to as an insert.

  On the other hand, the computer case has logos 2 and 12 of the manufacturer of the computer, various guidance displays 3 and 13, displays 4 and 14 indicating the specifications of the computer, and logos 5 and 15 of the parts manufacturers used inside the computer. Etc. (corresponding to the “insert” in the present invention). Such a sign may be a planar pattern or a three-dimensional design. In conventional computer cases, such signs are adhered to the surface of the case using an adhesive or the like. However, in order to adhere the signs to the surface of the case, a separate adhesion process is required in addition to the case manufacturing process. Have to go through. And the label | marker adhere | attached with the adhesive agent has the malfunction that adhesive force becomes weak as time passes, and it becomes easy to peel easily. Furthermore, when the sign has a three-dimensional design, it protrudes to the outside and not only looks bad, but also has a problem that the adhesive strength is further weakened.

  The present invention improves the conventional method of inserting an insert into an electronic product case, and does not require another additional process for inserting the insert into the electronic product case. The main object of the present invention is to provide a double injection molding method for producing a case for electronic products having a beautiful appearance.

  In order to achieve the above object, the double injection molding method of the present invention has, as a first aspect, a first mold assembly and a second mold assembly including a fixed mold and a movable mold. Each of the fixed molds is formed with a runner, and each of the runners is provided with a gate, and the movable mold of the first mold assembly and the second mold assembly A double injection molding method using a double injection molding apparatus in which the movable mold is integrally formed, wherein the movable mold of the first mold assembly is moved away from the fixed mold, Opening the first mold assembly; placing an insert in the movable mold of the first mold assembly; and moving the movable mold of the first mold assembly with the fixed mold. A step of joining; a first through a gate installed in a fixed mold of the first mold assembly; Injecting the discharged liquid into the first mold assembly; moving the movable mold of the first mold assembly away from the fixed mold, and opening the first mold assembly. Moving a primary injection molded product made of the first mold assembly to a movable mold of the second mold assembly; moving the movable mold of the second mold assembly to the fixed mold; And a step of injecting a second injection liquid into the second mold assembly through the gate provided in a fixed mold of the second mold assembly; and the second mold assembly. Moving the movable mold away from the stationary mold and opening the second mold assembly; and removing the completed injection molded product from the second mold assembly. It is characterized by that.

  In the second aspect of the double injection molding method of the present invention, instead of placing the insert in the movable mold in the first mold assembly, a primary injection molded article was made with the first mold assembly. Then, after moving this into the movable mold of the second mold assembly, the double injection molding method according to the first aspect, except that the insert is placed in the primary injection molded product. It has basically the same configuration.

  In the first and second aspects of the double injection molding method of the present invention, the double injection molding apparatus further comprises an insert gripping mechanism or a robot arm, and the insert is a first mold assembly. It is preferable that the step of placing in the movable mold (first aspect) or in the primary injection molded product (second aspect) is performed by the insert gripping mechanism or the robot arm.

  Furthermore, a concave portion having a shape corresponding to the insert for positioning and holding the insert is provided in the movable mold (first aspect) or in the primary injection molded product (second aspect). Is preferred.

  Furthermore, it is preferable that an adhesive is applied to the back surface of the insert.

  Furthermore, the movable mold and the insert may be a magnetic body, and the insert may be fixed in the movable mold by a magnetic force.

  The case for electronic products manufactured by the above-described double injection molding method of the present invention includes an outer layer formed of a transparent resin and an inner layer formed by injecting a colored resin on the inner surface of the outer layer. It consists of a double layer and includes an insert inserted between the outer layer and the inner layer.

  According to the double injection molding method of the present invention, various types of inserts are directly inserted between the outer surface layer and the inner surface layer of the electronic product case to manufacture the electronic product case integrally. Therefore, there is no separate additional process for inserting the insert, and various inserts can be inserted into the electronic product case, and there is an advantage that a finished product can be made in a single process.

  Further, since the case for electronic products according to the present invention is formed to be a double layer, the strength is higher than that of a single layer case, and the outer insert is made transparent so that the built-in insert can be externally provided. In addition, it is possible to reliably prevent the insert from dropping off, breaking, contact damage, and the like, and there is an advantage that there is no possibility of peeling off even in the case of a three-dimensional insert.

  The double injection molding method of the present invention and the injection molded product according to the method can be applied to the exterior case of all electronic products. For the sake of simplicity of illustration and convenience of explanation, the following is for desktop computers. The present invention will be described focusing on the outer case and the outer case for notebook computers.

  First, the double injection molding method according to the present invention will be specifically described with reference to FIG. The first embodiment of the double injection molding method of the present invention includes first mold assemblies 100 and 200 including a fixed mold 100 and a movable mold 200, and a second mold assembly (not shown). Each of the fixed molds 100 is formed with a runner (not shown), and each of the runners is provided with a gate (not shown), and the first mold assembly The movable mold 200 and the movable mold of the second mold assembly relate to a double injection molding method using a double injection molding apparatus formed integrally.

  First, in order to open the first mold assembly, the movable mold 200 is moved away from the fixed mold 100 in the direction opposite to the arrow A direction. Next, an insert 400 (only one insert is shown in the drawing, such as a computer manufacturer's logo, computer specification characters, or a microprocessor manufacturer's logo built into the computer). However, a plurality of inserts may be included in the movable mold 200.

  At this time, usually, the double injection molding apparatus further includes an insert object gripping mechanism or robot arm 300, and the insert object 400 is moved by the insert object gripping mechanism or robot arm 300 into the movable mold of the first mold assembly. 200 (first embodiment) or a primary injection molded product (second embodiment) is preferably disposed. The insert object gripping mechanism or robot arm 300 picks up the insert object 400, and the insert object 400 is moved to the movable mold 200 (first embodiment) of the first mold assembly or the primary injection molded product (second embodiment). As a device to be automatically arranged in the form), the movable mold of the first mold assembly or the second mold assembly in a state where the first mold assembly or the second mold assembly is opened. And insert the insert into the movable mold 200 of the first mold assembly (first embodiment) or the primary injection molded product (second embodiment), The apparatus moves to the outside of the first mold assembly or the second mold assembly before closing the first mold assembly or the second mold assembly.

  Next, after the movable mold 200 is moved in the direction of arrow A to be coupled to the fixed mold 100, the first injection liquid is supplied through a gate (not shown) installed in the fixed mold 100. 1 Inject into mold assembly. At this time, the first injection liquid is preferably made of a transparent or translucent resin so that the internal insert 400 can be clearly seen.

  Next, the movable mold 200 of the first mold assembly is moved away from the fixed mold 100 in the direction opposite to the arrow A direction, the first mold assembly is opened, and then the first mold assembly is opened. A primary injection molded product (semi-finished product) made of the mold assembly is moved to the movable mold of the second mold assembly.

  At this time, the method of moving the primary injection molded product made of the first mold assembly to the movable mold of the second mold assembly is performed as follows.

  When the movable mold 200 of the first mold assembly is rotated 180 degrees, the movable mold 200 of the first mold assembly is moved to the position of the movable mold of the second mold assembly. The movable mold of the second mold assembly is moved to the position of the movable mold of the first mold assembly. More specifically, since the movable mold of the first mold assembly and the movable mold of the second mold assembly are integrally connected in the horizontal direction, the first mold assembly is movable. When the mold 200 is rotated 180 degrees, the movable mold 200 of the first mold assembly and the movable mold of the second mold assembly are automatically switched in position (that is, the first mold). The movable mold 200 of the mold assembly becomes the movable mold of the second mold assembly, and the movable mold of the second mold assembly becomes the movable mold 200 of the first mold assembly).

  In conclusion, by rotating the movable mold 200 of the first mold assembly by 180 degrees, the primary injection molded product (semi-finished product) made of the first mold assembly is converted into the second mold assembly. It will be moved to a movable mold.

  Next, after the movable mold of the second mold assembly is coupled to the fixed mold, the second injection liquid is injected through the gate installed in the fixed mold of the second mold assembly. Injection into the second mold assembly. Usually, the first injection liquid uses a transparent or translucent resin so that the internal insert can be seen well, but the second injection liquid uses a colored resin of an appropriate color in consideration of the design.

  Next, the movable mold of the second mold assembly is moved away from the fixed mold, the second mold assembly is opened, and the completed injection-molded product is transferred to the second mold. Remove from assembly.

  As shown in FIG. 1, the movable mold 200 normally includes a recess having a shape corresponding to the insert 400 for positioning and holding the insert 400.

  Furthermore, if necessary, an adhesive may be applied to the back surface of the insert 400, and the insert 400 may be temporarily bonded and fixed in place in the movable mold 200.

  In addition, the movable mold 200 and the insert 400 can be made of a magnetic material, and the insert 400 can be fixed in the movable mold 200 by a magnetic force.

  According to the second embodiment of the present invention, instead of placing the insert in the movable mold in the first mold assembly, the primary mold is made with the first mold assembly, and then the primary mold is formed. Basically the same configuration as that of the first embodiment except that the insert is placed in the primary injection molded product after the injection molded product is moved into the movable mold of the second mold assembly. Have. Therefore, a detailed description of the second embodiment of the present invention is omitted.

  The case for electronic products manufactured by the above-described double injection molding method of the present invention includes an outer layer formed of a transparent resin and an inner layer formed by injecting a colored resin on the inner surface of the outer layer. It consists of a double layer, and includes an insert inserted between the outer layer and the inner layer. Specific contents for this will be described below with reference to FIGS.

  FIG. 4 shows a front case 20 for a desktop computer according to the present invention. FIG. 5 shows an exploded configuration of the front case 20 of FIG. The front case 20 is assembled to form the front surface of the desktop computer 100.

  As shown in FIG. 4, a front case 20 for a desktop computer generally includes a button mounting portion 23 having a button such as a power button, a disk mounting portion 24 for mounting various built-in disks, and various terminals. And the like, and includes various inserts 26, 27, 28, and 29. Inserts included in the front case 20 include a part logo 26 used inside the computer, a computer manufacturer logo 27, a button guidance display 28, a computer brand name 29, and the like. Such inserts 26, 27, 28, 29 can be flat (particularly film-like) or three-dimensional design shapes.

  As shown in FIG. 5, the front case 20 for a computer according to the present invention is formed of a double resin layer. That is, the front case 20 is formed of a double layer of the outer layer 21 and the inner layer 22. The outer layer 21 is molded from a transparent resin, and the inner layer 22 is molded from a colored resin. The outer layer 21 and the inner layer 22 have substantially the same shape. In some cases, as long as the outer layer 21 and the inner layer 22 can be formed of double resin layers, they may be formed in different shapes. Various inserts 26, 27, 28, and 29 are inserted between the outer layer 21 and the inner layer 22.

  The inserts 26, 27, 28, and 29 can be bonded to the inner surface of the outer layer 21 by an adhesive method. Further, magnetism can be applied from the outer surface of the outer layer 21 to the inserts 26, 27, 28, 29 arranged on the inner surface of the outer layer 21, and the insert can be adsorbed by magnetic force. As another method, recesses for positioning and holding the inserts 26, 27, 28, 29 may be formed on the inner surface of the outer layer 21 or the outer surface of the inner layer 22. , 27, 28, 29 can be inserted into the recess and held in position.

  6 and 7 show a notebook personal computer 500 according to the present invention in which the upper case 30 and the upper case 30 are assembled. As described above, the upper case 30 for the notebook computer 500 according to the present invention has the same configuration as the front case 20 for the desktop computer. That is, the upper surface case 30 for the notebook computer 500 also includes an outer layer 31, an inner layer 32, and various inserts 33 and 34 sandwiched therebetween. Since these configurations are the same as those of the front case 20 for a desktop computer described above, detailed description thereof is omitted.

  The double injection molding method of the specific embodiment of the present invention described above is merely an example, and the technical field of the present invention is not limited to the specific mode described above. A person having ordinary knowledge in the technical field to which the present invention pertains can variously modify or change the present invention without departing from the technical idea and technical scope of the present invention described in the claims. .

  For example, in the double injection molding method of the above-described embodiment, the outer layers 21 and 31 are molded with a transparent resin, and the inner layers 22 and 32 are molded with a colored resin. The outer layers 21 and 31 and the inner layers 22 and 32 can be molded with different colors, and can be double injection molded with different transparency. Furthermore, the inserts 26, 27, 28, 29, 33, 34 are not limited to the above-mentioned types of signs, and the insertion method of the inserts 26, 27, 28, 29, 33, 34 can be bonded or bonded. The insert 26, 27, 28, 29, 33, 34 can be fixed to the inner surface of the outer layer 21 while the inner layer 22 is injection-molded on the inner surface of the outer layer 21. Any insert can be placed by any method. Furthermore, the inserts 26, 27, 28, 29, 33, 34 are not only configured to be fixed to the inner surface of the outer layer 21 by injection molding, but also the inserts 26, 27, 28, 29, 33, 34 are attached to the inner layer 22. The outer layer 21 can be injection molded after being fixed to the outer side surface.

The conceptual diagram for demonstrating the method of carrying out double injection molding incorporating the insert thing which concerns on this invention. The perspective view which shows the case for the conventional desktop computers. The perspective view which shows the case for the conventional notebook personal computers. The perspective view which shows the case for desktop computers which concerns on this invention. The figure which decomposes | disassembles and shows the structure of the front case of FIG. The perspective view which shows the case for notebook computers which concerns on this invention. The figure which decomposes | disassembles and shows the structure of the upper surface case of FIG.

Explanation of symbols

26 to 29, 33, 34, 400 ... inserts, 100 ... fixed mold, 200 ... movable mold, 300 ... mechanism for gripping inserts or robot arm.

Claims (9)

A first mold assembly and a second mold assembly including a fixed mold and a movable mold are included, and each of the fixed molds is formed with a runner, and each of the runners is A double injection molding method using a double injection molding apparatus in which a gate is installed and a movable mold of the first mold assembly and a movable mold of the second mold assembly are integrally formed Because
Moving the movable mold of the first mold assembly away from the fixed mold and opening the first mold assembly;
Placing an insert into a movable mold of the first mold assembly;
Coupling the movable mold of the first mold assembly with the stationary mold;
Injecting a first injection liquid into the first mold assembly through the gate installed in a fixed mold of the first mold assembly;
Moving the movable mold of the first mold assembly away from the fixed mold and opening the first mold assembly;
Moving a primary injection molded product made of the first mold assembly to a movable mold of the second mold assembly;
Coupling the movable mold of the second mold assembly with the stationary mold;
Injecting a second injection liquid into the second mold assembly through the gate installed in the fixed mold of the second mold assembly;
Moving the movable mold of the second mold assembly away from the fixed mold, and opening the second mold assembly; and completing the injection-molded product to the second mold assembly Removing from the solid;
A double injection molding method incorporating an insert. The double injection molding apparatus further includes an insert gripping mechanism or a robot arm,
2. The double injection incorporating an insert according to claim 1, wherein the step of placing the insert in the movable mold of the first mold assembly is performed by the insert gripping mechanism or the robot arm. Molding method. A first mold assembly and a second mold assembly including a fixed mold and a movable mold are included, and each of the fixed molds is formed with a runner, and each of the runners is A double injection molding method using a double injection molding apparatus in which a gate is installed and a movable mold of the first mold assembly and a movable mold of the second mold assembly are integrally formed Because
Coupling the movable mold of the first mold assembly with the stationary mold;
Injecting a first injection liquid into the first mold assembly through the gate installed in a fixed mold of the first mold assembly;
Moving the movable mold of the first mold assembly away from the fixed mold and opening the first mold assembly;
Moving a primary injection molded product made of the first mold assembly to a movable mold of the second mold assembly;
Placing an insert in the primary injection molded article;
Coupling the movable mold of the second mold assembly with the stationary mold;
Injecting a second injection liquid into the second mold assembly through the gate installed in the fixed mold of the second mold assembly;
Moving the movable mold of the second mold assembly away from the fixed mold and opening the second mold assembly; and completing the injection-molded product to the second mold assembly. Removing from the step;
A double injection molding method incorporating an insert. The double injection molding apparatus further includes an insert gripping mechanism or a robot arm,
4. The double injection molding method with a built-in insert according to claim 3, wherein the step of arranging the insert in the primary injection molded product is performed by the insert gripping mechanism or the robot arm.   3. The double containing the insert according to claim 1, wherein the movable mold includes a concave portion having a shape corresponding to the insert for positioning and holding the insert. Injection molding method.   The double injection containing the insert according to claim 3 or 4, wherein the primary injection-molded product includes a recess having a shape corresponding to the insert for positioning and holding the insert. Molding method.   The double-injection molding method incorporating the insert according to any one of claims 1 to 4, wherein an adhesive is applied to the back surface of the insert.   The said movable metal mold | die and the said insert thing are magnetic bodies, This insert thing is fixed in this movable metal mold | die by magnetic force, The any one of Claim 1 thru | or 4 characterized by the above-mentioned. Double injection molding method with built-in insert. An electronic product case produced by a double injection molding method incorporating the insert according to any one of claims 1 to 4,
An outer layer formed of a transparent resin; and an inner layer formed of a colored resin injected on the inner surface of the outer layer;
Consisting of a double layer composed of
An electronic product case comprising an insert inserted between the outer layer and the inner layer.

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