JP3150804B2 - Manufacturing method of insert molding die and insert molded product - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insert molding die used for producing an insert molded product in which an insert sheet is integrally attached to the surface of the molded product while obtaining the molded product by injection molding, and an insert molding die for use in the production. The present invention relates to a method for manufacturing an insert molded product using an insert molding die.

[0002]

2. Description of the Related Art The present invention is applied to the manufacture of various insert molded products. A description will be given of a membrane switch member used for an input section of a home appliance as an insert molded product.

Conventionally, as a method for manufacturing a membrane switch member, a molded product serving as a support for the membrane switch member is injection-molded in advance, and a membrane sheet obtained by punching or cutting out only necessary portions is prepared. There is a method of sticking each of them on a molded article by hand.

As another manufacturing method, a molded product and an insert sheet are integrated by inserting a continuous insert sheet between a pair of insert molding dies and injecting a molten resin between the insert molding dies. After doing
There is a method of cutting unnecessary portions of the insert sheet.

[0005]

However, in the former manufacturing method, it is time-consuming because injection molding of a molded article serving as a support for the membrane switch member and cutting out of the membrane sheet must be performed separately. In addition, it takes time and effort to attach the molded article and the membrane sheet. Therefore, the production efficiency of the membrane switch member was poor.

Further, in the latter manufacturing method, the membrane switch member is pulled out of the insert molding die in a state where the membrane switch member remains attached to the membrane sheet. It could not be wound by the device. Alternatively, it is necessary to cut out the molded product with a knife or a cutting blade before the membrane sheet is wound up after being drawn out from between the molds, so that it takes time and labor, and the production efficiency is poor.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide an insert molding die with high production efficiency and a method of manufacturing an insert molded product using the same.

[0008]

In order to achieve the above-mentioned object, an insert molding die of the present invention comprises a die A and a die B having a resin injection port. In the insert molding die in which the cavity is formed by closing the mold A and the mold B with the mold sandwiched therebetween, a frame-shaped cut line is provided in the insert sheet on the side opposite to the insert sheet feeding direction from the cavity. It was configured such that a perforated line applying portion having a blade was formed.

A method of manufacturing an insert-molded article of the present invention uses the insert-molding die of the present invention.
The mold is closed by sandwiching a continuous insert sheet between the mold and the mold B to form a cavity, and then the molten resin is injected into the cavity from a resin injection port, and the molten resin is cooled and solidified, thereby forming the cavity. In the manufacturing method of the insert molded product to obtain an insert molded product in which the product and the insert sheet are integrated, the mold is closed to form the cavity, and at the same time, the insert sheet to be insert molded after one pitch is cut into a frame shape by the cutout line imparting portion. A cut line was provided, and after the mold was opened, the insert molded product was cut from the insert sheet along the cut line.

[0010]

In the insert molding die used in the present invention, a cutting line providing portion for forming a frame-shaped cutting line is formed in the insert sheet separately from the cavity, so that the die A and the die B can be used only once. When the mold is closed, insert molding is performed in the cavity, and in the cut line applying portion, a cut line can be provided in a frame shape on an insert sheet that is insert-molded after one pitch.

[0011]

An embodiment in which the membrane sheet 2 is used as an insert sheet and the membrane switch member 24 is manufactured as an insert molded product will be described below with reference to the drawings.

First, an insert mold is prepared (see FIG. 1). The insert molding die of the present invention comprises a die A
And a mold B having a resin injection port 1. The mold A and the mold B form a cavity 5 by closing the mold with the continuous membrane sheet 2 interposed therebetween. By injecting the molten resin 3 into the cavity 5, an insert molded product in which the molded product 4 and the membrane sheet 2 are integrated is obtained.

Further, the mold A and / or the mold B include:
A cut line applying portion 6 is formed on the opposite side of the cavity 5 from the direction in which the membrane sheet 2 is fed.

The cut line applying section 6 has a blade for providing a frame-shaped cut line 7 on the membrane sheet 2 and is formed on the mold A and / or the mold B. The frame-shaped cutout line 7 is provided to facilitate cutting and separating the membrane sheet 2 after insert molding, and includes a half cut, a perforation, and the like. The half cut refers to a cut to approximately half the thickness of the membrane sheet 2 in the thickness direction, and the perforation refers to the membrane sheet 2.
Perforations are formed intermittently.

When the mold A and the mold B are closed in the mold B, a projection 8 is formed in the cavity 5 so as to contact the surface of the mold A with the membrane sheet 2 interposed therebetween.
It may be provided in. Further, a clamp mechanism for fixing the membrane sheet 2 positioned by the insert molding die may be provided.

Next, the membrane sheet 2 is intermittently fed and positioned between the insert molds of the present invention (see FIG. 1).

The membrane sheet 2 is obtained by forming a painting layer 20 composed of a design layer, an adhesive layer and the like on a base film. The substrate film is used as a substrate film of a normal insert sheet, and includes a plastic film such as polyethylene terephthalate, polycarbonate, and vinyl chloride. The design layer is
In order to form a pattern, a picture, a logo, a character, a symbol, and the like on the surface of the molded article, it is formed by a usual forming method such as printing. The design layer may have a metal layer formed by vacuum evaporation. The adhesive layer is for adhering the membrane sheet 2 to the surface of the molded article at the same time as molding of the molded article, and is formed by a normal forming method such as printing using a heat-sensitive adhesive. Acrylic resin,
What is necessary is just to design suitably according to the kind of molding resin, such as styrene di resin, chlorinated ethylene vinyl acetate copolymer resin, and cyclized rubber.

In order to position the membrane sheet 2 intermittently between the insert molding dies, the membrane sheet 2 is fed from a membrane sheet feeding device 22 in which the membrane sheet 2 is wound into a roll and a membrane sheet fed from the feeding device 22. Membrane sheet winding device 2
3 is disposed with the insert molding die interposed therebetween, and a membrane sheet feeding device 2 utilizing a positioning sensor or the like.
2 and the membrane sheet take-up device 23 may be driven and stopped, and the membrane sheet 2 may be fed to an accurate position with respect to the insert mold.

Next, the mold A and the mold B are closed, and a cut line 7 is provided on the membrane sheet 2 by the cut line applying section 6 (see FIG. 2).

Next, the mold A and the mold B are opened, and the continuous membrane sheet 2 is wound up by one pitch by the membrane sheet take-up device 23, so that a frame-shaped cut line 7 is formed on the membrane sheet 2. The provided portion moves along the mold A to the cavity forming surface. (See FIG. 3).

Next, the mold A is sandwiched between the membrane sheets 2.
And the mold B are closed, and a cavity 5 is formed between the mold A and the mold B (see FIG. 4). At the same time as closing this mold,
On the side opposite to the membrane sheet feeding direction from the cavity 5, a frame-shaped cutting line 7 is formed on the membrane sheet 2 which is insert-molded after one pitch by the cutting line applying portion 6.
(See FIG. 4).

Next, the molten resin 3 is injected from the resin injection port 1 into the cavity 5, and the molten resin 3 is cooled and solidified, whereby the molded article 4 and the membrane sheet 2 are integrated (see FIG. 5). The molded article 4 serves as a support for the membrane sheet 2. At this time, when the mold B having the protruding portion 8 is used, the molten resin does not flow into the protruding portion 8, so that a molded product having an opening is obtained, and the membrane sheet 2 and the molded product are covered so as to cover the opening. Are integrated (see FIG. 6). The adhesive layer of the membrane sheet 2 is melted by the heat of the resin when the molten resin 3 is injected, and the adhesive layer adheres to the surface of the molded article 4 as the molten resin is cooled and solidified. As the molten resin 3, acrylonitrile styrene resin, acrylonitrile butadiene styrene resin,
Examples include a polycarbonate resin, a polystyrene resin, an acrylic resin, and a polyester resin.

Next, the mold A and the mold B are opened (see FIG. 6).

Next, the molded product 4 is gently pulled by a suitable means such as a membrane switch member take-out device 30 (see FIG. 7) in which a movable arm with a suction cup is rotatably attached to the support. The bonded part of the membrane sheet 2 is cut out from the continuous membrane sheet 2 along a cut line 7 in a frame shape. This cutting operation may be performed when the molded article 4 attached to the continuous membrane sheet 2 is located between the mold A and the mold B, or after the membrane sheet 2 is sent out by one pitch. It may be performed outside. Thus, a membrane switch member 24 in which the molded product 4 and the cut-off membrane sheet 2 are integrated is obtained. Here, the membrane sheet 2 cut into a frame shape may be smaller than the dimension of the upper surface of the molded article 4 as shown in FIG. 5, or may be equal to or larger than the dimension of the upper surface of the molded article 4. When the membrane sheet 2 cut out in a frame shape is smaller than the dimension of the upper surface of the molded product 4, the molded product is not damaged when the membrane sheet 2 is cut out in a frame shape as in a conventional insert method. After the membrane sheet 2 is cut off, a continuous shell portion 21 is formed on the continuous membrane sheet 2. The hollow shell portion 21 can be easily wound without the molded article 4 being in the way as in the conventional insert method. Can be

As described above, one cycle of the method of manufacturing an insert molded product is completed.

Further, in the insert molding die having the above-described structure, a concave / convex portion 9 for molding the membrane sheet 2 may be formed in a portion of the cut line applying portion 6 surrounded by the blade (see FIG. 8). The concave-convex portion 9 is for closing the mold A and the mold B to form the membrane sheet 2 into an irregular shape. The formation of the membrane sheet 2 is performed by using
Since the uneven portion 9 is formed in the portion surrounded by the blade,
This is performed at the same time when the frame-shaped cutting line 7 is provided on the membrane sheet 2 by the cutting line applying section 6.

The present invention is not limited to the above-described method for manufacturing a membrane switch member, but may be used for a method for manufacturing an insert molded product other than a membrane switch member.

[0028]

According to the present invention, the following effects can be obtained because of the configuration and operation described above. In other words, with one closing of the insert molding die, insert molding and providing a frame-shaped cut line on an insert sheet to be insert molded after one pitch can be performed at the same time. Can be easily cut from the insert sheet simply by pulling it lightly with a membrane switch member take-out device or the like, so that time and labor are not required and production efficiency is high.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a method for manufacturing an insert molded product according to the present invention.

FIG. 2 is a cross-sectional view showing one embodiment of the method for producing an insert molded product according to the present invention.

FIG. 3 is a cross-sectional view showing one embodiment of the method for producing an insert molded product according to the present invention.

FIG. 4 is a cross-sectional view showing one embodiment of the method for producing an insert molded product according to the present invention.

FIG. 5 is a cross-sectional view showing one embodiment of the method for producing an insert molded product according to the present invention.

FIG. 6 is a cross-sectional view showing one embodiment of the method for producing an insert molded product of the present invention.

FIG. 7 is a cross-sectional view showing one embodiment of the method for producing an insert molded product according to the present invention.

FIG. 8 is a sectional view showing another embodiment of the method for producing an insert molded product according to the present invention.

[Explanation of symbols]

 Reference Signs List A Mold B Mold 1 Resin injection port 2 Membrane sheet 3 Molten resin 4 Molded product 5 Cavity 6 Cutting line applying section 7 Cutting line 8 Projecting section 9 Irregular section 20 Painting layer 21 Outer shell section 22 Membrane sheet feeding device 23 Membrane sheet Take-up device 24 Membrane switch member 30 Membrane switch member take-out device

Continuation of the front page (56) References JP-A-63-126711 (JP, A) JP-A-63-78717 (JP, A) JP-A-5-31769 (JP, A) JP-A-6-166054 (JP) , A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 45/00-45/84

Claims (4)

(57) [Claims] 1. A cavity is formed by closing a mold A and a mold B with a continuous insert sheet between the mold A and a mold B having a resin injection port. An insert molding die, characterized in that a cutting line applying portion having a blade for providing a frame-shaped cutting line on an insert sheet is formed on a side of the insert sheet opposite to the insert sheet feeding direction. 2. The insert molding die according to claim 1, wherein an uneven portion for forming an insert sheet is formed in a portion surrounded by the blade of the cutting line applying portion. 3. A cavity is formed by using the insert molding die according to claim 1 and closing a die between a die A and a die B with a continuous insert sheet interposed therebetween.
In a method for manufacturing an insert molded product in which a molded product and an insert sheet are integrated by injecting a molten resin from a resin injection port into a cavity and cooling and solidifying the molten resin, the mold is closed and the cavity is closed. Forming an insert sheet which is insert-molded after one pitch, providing a cut line in a frame shape by a cut line applying portion, and cutting the insert molded product from the insert sheet along the cut line after opening the mold. Manufacturing method of molded article. 4. A cavity is formed by using the insert molding die according to claim 2 and closing a die between a die A and a die B with a continuous insert sheet interposed therebetween.
In a method for manufacturing an insert molded product in which a molded product and an insert sheet are integrated by injecting a molten resin from a resin injection port into a cavity and cooling and solidifying the molten resin, the mold is closed and the cavity is closed. At the same time as forming, the insert sheet to be insert-molded after one pitch is formed by the concave and convex portions, and a cut-off line is provided in the form of a cut-off line, and after the mold is opened, the insert-formed product is cut out from the insert sheet along the cut-off line. A method for producing an insert molded product, comprising: