JPH06166054A - Manufacture of insert mold and insert molding - Google Patents

Abstract

PURPOSE:To obtain insert mold having good production efficiency by a method wherein a cutting part, with which sheet is cut in the shape of a frame, and a recesses part, in which a molding is housed, are provided toward the feeding direction of the sheet from the cavity of the mold at the molding, to the surface of which the sheet is stuck, by performing injection molding under the condition that the continuous sheet is held between the molds. CONSTITUTION:A cavity 5 is formed by closing molds A and B under the condition that continuous sheet 2 is held between the molds A and B. In the mold A and/or the mold B, on the feeding direction side of the sheet 2 from the cavity 5, a cutting part 6, with which the unnecessary portion of the sheet 2 is cut off, and a recessed part 7, in which the molding 4 integral with the cut-off sheet 2 is housed, are provided. After the injection of resin in the cavity 5, the molds are opened. Then, the molding 4 stuck onto the continuous sheet 2 is taken out of the cavity 5 and fed intermittently so as to position the molding 4 above the recessed part 7. After that, the molds are closed, resulting in cutting off the unnecessary portion of the sheet 2 with the cutting part 6 and housing the molding 4 in the recessed part 7 and, at the same time, forming the cavity 5.

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 to obtain a molded product by injection molding and, at the same time, to manufacture an insert molded product in which an insert sheet is integrally attached to the surface of the molded product. The present invention relates to a method for manufacturing an insert molded product using an insert molding die.

The present invention is applied to the manufacture of various insert-molded products, and a membrane switch member used as an insert-molded product in the input section of home electric appliances will be described as an example.

[0003]

2. Description of the Related Art Conventionally, as a method for manufacturing a membrane switch member, a molded product serving as a support for the membrane switch member is obtained by injection molding in advance, and separately prepared a membrane sheet punched or cut out only a necessary portion, There is a method of manually attaching the membrane sheet to the molded product one by one.

As another manufacturing method, a continuous membrane sheet is sandwiched between a pair of insert molding dies, and a molten resin is injected between the insert molding dies to integrate the molded product with the membrane sheet. There is a method of intermittently feeding the membrane sheet and pulling it out from between the insert molding dies with the membrane switch member attached to the membrane sheet.

[0005]

However, in the former manufacturing method, it takes time since the injection molding of the molded product serving as the support of the membrane switch member and the cutout of the membrane sheet have to be performed separately. Moreover, it takes time and labor to attach the molded product 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 from the insert molding die in a state where the membrane switch member is still attached to the membrane sheet. The device could not be wound up. Alternatively, since it is necessary to cut out the molded product after the film is pulled out from between the molds and before the membrane sheet is wound, it takes time and labor, and production efficiency is poor.

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

[0008]

In order to achieve the above object, an insert molding die of the present invention comprises a die A and a die B having a resin injection port, and a continuous insert sheet is interposed between the insert die and the die. In a insert molding die in which a cavity is formed by sandwiching a mold A and a mold B between them, a cutting portion for cutting the insert sheet into a frame shape on the insert sheet feeding direction side from the cavity and the insert molding It is configured such that a recess for accommodating the product is formed.

Further, the method of manufacturing the insert-molded article of the present invention uses the insert-molding die of the present invention,
Between the mold B and the mold B, a mold is closed by sandwiching a continuous insert sheet, and then a molten resin is injected into the cavity from a resin injection port, and the molten resin is cooled and solidified to be molded. In a method of manufacturing an insert-molded product in which a product and an insert sheet are integrated, insert molding is performed in a cavity, and at the same time, the insert sheet to which the molded product formed one pitch before is attached is cut by a cutting portion. It was cut into a shape, and the insert molded product in which the molded product and the insert sheet were integrated was housed in the recess, and the insert molded product was taken out after the mold opening.

[0010]

In addition to the cavity, the insert molding die used in the present invention has a cutting portion for cutting the insert sheet into a frame shape and a concave portion for accommodating the insert molding product. With one mold closing, insert molding is performed in the cavity, the insert sheet to which the molded product molded one pitch before is attached is cut into a frame shape in the cutting part, and the molded product and insert sheet are integrated in the concave part. It is possible to accommodate the insert molded product.

[0011]

EXAMPLE An example in which the membrane sheet 2 is used as an insert sheet and the membrane switch member 24 is manufactured as an insert molded article will be described below with reference to the drawings. First, an insert molding die is prepared (see FIG. 1). The insert molding die of the present invention comprises a die A and a die B having a resin injection port 1. Mold A
The mold B and the mold B form a cavity 5 by closing the mold with a 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 are
A cutting portion 6 and a concave portion 7 are formed on the side of the cavity 5 in the feeding direction of the membrane sheet 2.

The cutting portion 6 is a portion for cutting out an unnecessary portion of the membrane sheet 2. The cutting portion 6 may be one that cuts between the peripheral edge of the convex portion provided on the mold A and the peripheral edge of the concave portion 7 (see FIG. 1), or the mold A and / or the metallic mold. B, knife or cutting blade 21
Alternatively, a heating cutting device or a laser cutting device may be attached.

The recess 7 is a membrane switch member 2 in which the cut-out membrane sheet 2 and a molded product are integrated.
4 is a part for housing 4. The size of the recess 7 may be any size as long as there is a space into which the membrane switch member 24 in which the cut-out membrane sheet 2 and the molded product are integrated can enter.

The mold A and the mold B are closed in the mold B so that the mold A is sandwiched by the membrane sheet 2.
A protrusion 8 may be provided in the cavity 5 so as to abut the surface of the cavity.

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

The membrane sheet 2 is formed by forming a painting layer 20 including a pattern layer and an adhesive layer on a base film. The base film is used as a base film of an ordinary insert sheet, and includes a plastic film such as polyethylene terephthalate. The pattern layer is formed by a usual forming method such as printing in order to form a pattern, a painting, a logo, characters, symbols and the like on the surface of the molded product. The pattern layer may have a metal layer formed by vacuum vapor deposition. The adhesive layer is for adhering the membrane sheet 2 to the surface of the molded product simultaneously with molding of the molded product, and is formed by a usual forming method such as printing using a resin of the same type as the resin constituting the molded product. It

To intermittently feed and position the membrane sheet 2 between the insert molding dies, the membrane sheet feeding device 22 in which the membrane sheet 2 is wound into a roll and the membrane sheet fed from the feeding device 22 are used. Membrane sheet winding device 2
3 and 3 are arranged sandwiching the insert molding die, and the feeding and winding drives are turned on / off by using a positioning sensor or the like, and the membrane sheet 2 is stopped at an accurate position with respect to the insert molding die. You should let me.

Next, the mold A and the mold B are closed, and the cavity 5 is formed between the mold A and the mold B (see FIG. 2).

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, so that the molded product 4 and the membrane sheet 2 are integrated (see FIG. 3). The molded product 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 3 does not flow into the protruding portion 8, so that a molded product having an opening is obtained, and the membrane sheet 2 covers the opening. And the molded product are integrated (see FIG. 4). 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 product 4 as the molten resin cools and solidifies. Examples of the molten resin 3 include acrylonitrile styrene resin, polycarbonate resin, polystyrene resin, acrylic resin and polyester resin.

Next, the mold A and the mold B are opened, and the molded product 4 is taken out from the cavity 5 while being attached to the membrane sheet 2. (See Figure 4).

Next, the membrane sheet 2 is intermittently fed with the molded product 4 attached (see FIG. 6), and the molded product 4 is positioned on the recess 7 (see FIG. 1).

Next, the mold A and the mold B are closed, and
Unnecessary portions of the membrane sheet 2 are cut off by the cutting portion 6 on the feed direction side of the cavity sheet 5 from the cavity 5, and the cut-out membrane sheet 2 and the molded product 4 are housed in the concave portion 7 as a membrane switch member 24. (See FIG. 2). Simultaneously with this mold closing, a cavity 5 is formed on the side opposite to the feeding direction of the membrane sheet 2 (see FIG. 2), and the molten resin 3 is injected into the cavity 5,
The molten resin is cooled and solidified, and the molded product 4 and the membrane sheet 2 are integrated (see FIG. 3).

Next, the mold A and the mold B are opened, and the continuous membrane sheet 2 is wound by one pitch by the membrane sheet winding device 23, and the continuous membrane sheet 2 is cut into a frame shape. Membrane switch member 24 in which the membrane sheet 2 and the molded product 4 are integrated
Are separated, and only the membrane switch member 24 remains in the recess 7 (see FIG. 4). The membrane sheet 2 to be wound has a shell 21 formed therein (see FIGS. 5 and 6). At the time of this winding, the membrane sheet 2
The insert molding die is positioned with respect to the cavity 5. In order to ensure that the membrane switch member 24 remains in the recess 7, it is preferable to provide an ejector pin on the mold A and push the cut-out membrane sheet 2 together with the molded product 4 to the mold B side. The membrane switch member 24 left in the concave portion 7 is closed by the appropriate means such as a membrane switch member take-out device 30 (see FIG. 5) in which a movable arm with a suction cup is rotatably attached to the column until the next mold closing. , Take it out of the mold.

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

[0026]

Since the present invention has the above-described structure and operation, the following effects can be obtained. That is, since it is possible to perform insert molding, cutting of the insert membrane sheet insert-molded one pitch before and accommodating the insert-molded product at the same time by closing the insert-molding die once, it is possible to save time and labor. The production efficiency is good.

Further, since the continuous insert sheet is pulled out from the insert molding die in a state where the insert molded product is already cut off, the insert sheet can be easily wound by a roll-shaped winding device, and It does not take time and effort, and production efficiency is good.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a method for manufacturing an insert molding die and a membrane switch member of the present invention.

FIG. 2 is a cross-sectional view showing one step of a method of manufacturing the insert molding die and the membrane switch member of the present invention.

FIG. 3 is a cross-sectional view showing one step of a method of manufacturing the insert molding die and the membrane switch member of the present invention.

FIG. 4 is a cross-sectional view showing one step of a method of manufacturing the insert molding die and the membrane switch member of the present invention.

FIG. 5 is a cross-sectional view showing one step of a method of manufacturing the insert molding die and the membrane switch member of the present invention.

FIG. 6 is a cross-sectional view showing one step of a method of manufacturing the insert molding die and the membrane switch member of the present invention.

[Explanation of symbols]

 A Mold B Mold 1 Resin injection port 2 Membrane sheet 3 Molten resin 4 Molded product 5 Cavity 6 Cutting section 7 Recessed section 8 Projection section 20 Painting layer 21 Outer shell section 22 Membrane sheet feeding apparatus 23 Membrane sheet winding apparatus 24 Membrane switch Material 30 Membrane switch material removal device

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification number Internal reference number FI technical display location // B26D 1/08 7347-3C B29L 31:34 4F (72) Inventor Tadashi Taniguchi Kyoto Prefecture Kyoto 3 Mibu Hanai-cho, Nakagyo-ku, Japan

Claims (5)

[Claims] 1. A mold A and a mold B having a resin injection port, wherein a cavity is formed by closing the mold A and the mold B with a continuous insert sheet interposed therebetween. In the insert molding die, the insert molding die is characterized in that a cutting portion for cutting the insert sheet into a frame shape and a recess for accommodating the insert molded product are formed on the insert sheet feeding direction side of the cavity. 2. The cutting part has a mold A and / or a mold B.
The insert molding die according to claim 1, which is a cutting blade provided in the. 3. The cutting part has a mold A and / or a mold B.
The insert molding die according to claim 1, comprising a peripheral edge of a convex portion provided on the mold and a peripheral edge of a concave portion provided on the mold A and / or the mold B. 4. A cavity is formed on a surface of a mold B having a protrusion, and the mold A and the mold B are closed, so that the protrusion sandwiches the insert sheet and the surface of the mold A. The insert molding die according to any one of claims 1 to 3, which abuts against. 5. Using the insert molding die according to claim 1, a continuous insert sheet is sandwiched between the mold A and the mold B, and the mold is closed to form a cavity. Then, the molten resin is injected from the resin injection port into the cavity, and the molten resin is cooled and solidified to obtain an insert molded article in which the molded article and the insert sheet are integrated. At the same time when insert molding is performed, the insert sheet to which the molded product formed one pitch before is attached is cut into a frame shape by the cutting portion, and the insert molded product in which the molded product and the insert sheet are integrated is housed in the recess, A method for manufacturing an insert-molded product, which comprises taking out the insert-molded product after opening.