JPH01184113A - Integral molding method of resin and film - Google Patents

Abstract

PURPOSE:To obtain a molded item without deforming a rib and a boss and breaking a film, by providing holes in advance on the film at positions where the rib and the boss exercising locally forces to the film when a resin and a film are monolithically molded in the case when a recessed part exists on a mold. CONSTITUTION:A hole 11a is formed on a film 11 by punching a position corresponding to a rib- and boss-forming part of a bottom force 15A on a press mold 12 by means of a punch 12A and a die 12B. Then, the film 11 is transferred to a mold 15 and after positioning is finished by means of a positioning sensor 14, the film is sucked on the bottom force 15B by means of a sucking apparatus 15Bb and is thereon tightly adhered. A top force 15A and the bottom force 15B are joined together and a cavity between both molds is filled by injecting a resin from a resin injecting hole 15Aa of the top force 15A. In this instance, as the resin flows into a rib- and boss-forming part 15Ba of a recessed shape of the bottom force 15A through a hole 11a formed in advance on the film 11, no breakage of the film 11 occurs and no deformed rib or boss is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for integrally molding a resin and a film, in which a patterned film is brought into contact with a mold and the pattern is transferred to an injection molded product at the same time as injection molding. It is related to.

2. Description of the Related Art In general, in the process of obtaining a molded product using a transfer molding method, a method is used in which convex portions such as bosses and ribs of the molded product are deformed.

A conventional transfer molding method will be explained below with reference to the drawings.

FIG. 3 schematically shows an apparatus used in a conventional transfer molding method. A heater 2 and a sensor 3 for positioning the film 1 are arranged in order along the travel path of the film 1. Next, an upper mold 4, which corresponds to the back surface of the product, is placed on the top side of the film 1, and a top mold 4, which is the back side of the product, is placed on the bottom side of the film 1. Lower molds 5 corresponding to the surface of the product are disposed facing each other, and a suction device 6 for sucking the sheet 1 is provided on the lower mold 5 corresponding to the surface of the product.

The operation of the conventional device shown in FIG. 3 will be explained.

The film 1 is positioned and fixed by a sensor 3. Next, the suction device 6 is activated to draw the film 1 toward the lower mold 5, and the lower mold 5, which is the movable side, is activated to align it with the upper mold 4. Then, resin is injected from the upper mold 4 and both molds 4
, 5 is filled. The lower mold 5 operates to open the space between the two molds, and the molded product fixed to the upper mold 4 is ejected and removed, producing a single molded product.

Problems to be Solved by the Invention However, the conventional transfer molding method as described above has the following problems.

(1) If the desired molded product has a convex part such as a rib or boss, that is, if the lower mold 5 has a concave part, and the resin is injected from the upper mold 4, the film 1 will have the concave shape. deformed in the part.

fall into disrepair.

(2) If an ejector pin or the like is arranged to release the molded product, the ejector pin may damage the film 1, and it is necessary to eject the part where the film 1 is not present.

The present invention solves the above problems, and aims to provide a method for integrally molding a resin and a film using a transfer molding method that allows molding without deforming convex portions such as ribs and bosses of a molded product. That is.

Means for Solving the Problems In order to solve the above-mentioned problems, the method for integrally molding resin and film of the present invention includes, before the integral molding process, forming ribs, bosses, or integrally molded products that are formed during integral molding of the film. The film is characterized in that holes are made at locations corresponding to the positions where local forces are applied to the film, such as pins installed to push out the film.

Effect With the above configuration, by making holes in advance in the portions of the film corresponding to the ribs, bosses, or ejection pins using a press mold consisting of a punch and die, convex-shaped portions such as ribs and bosses can be formed in the molded product. The holes can be used to form the molded product and to eject the molded product, so the film can be ejected without damaging the film.
Furthermore, the convex portion described above can be molded without being deformed.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

1 and 2 are schematic cross-sectional views of essential parts of an apparatus used in the method of integrally molding resin and film according to an embodiment of the present invention, and FIG. 3 is a schematic side view of the apparatus.

In FIGS. 1 to 3, a press mold cover, a heater, a positioning sensor 14, and a mold mold are formed in order along the travel path of the film H. The press die ν consists of a punch 12A and a die 12B, which are arranged opposite to each other with the film U in between, and are arranged so as to form holes of a predetermined shape and size at a predetermined location on the film H. The mold is made up of an upper mold 15A and a lower mold 15B that face each other with the film 11 in between. A shaped rib and a boss forming portion 15Ba are provided, and a suction device 15Bb is provided, which can be moved up and down by a lifting means (not shown).

Next, integral molding of resin and film using the above-mentioned apparatus will be explained. The film 11 is punched out using a punch 12A and a die 12B in a press die ν at locations corresponding to the rib and boss forming portions of the lower die A to form holes 11a. Then, the film U is moved to the mold. Positioning is performed by a sensor 14. When the positioning is completed, the suction device 15Bb is used to suck the lower mold 15B into close contact with the lower mold 15B. The upper mold 15A and the lower mold 15B are combined, and resin is injected from the resin injection port 15Aa'f)> of the upper mold 15A to fill the cavity between the two molds. At this time, the resin is applied to the concave rib and boss forming portions 15B of the lower mold 15A.
Since it flows into the hole na previously formed in the film 11, the film 11 will not be damaged and the ribs and bosses will not be deformed.

FIG. 4 shows the molded product obtained in this example. A box body 16 made of resin has a film 11 integrally laminated on its inner surface, and a ribbed boss 17 on the inner bottom surface.
This boss 17 protrudes from a hole Ua previously provided in the film 11, and
No damage occurred to the boss 17, and no deformation occurred to the boss 17 either.

Note that, in the case where the molded product is ejected by an ejector pin or the like when releasing the molded product, the hole Ua of the film H may also be provided at a location where the ejector pin or the like comes into contact.

Effects of the Invention As described above, in the present invention, when the resin and film are integrally molded when the mold has a concave part for forming a convex part such as a rib or boss, local force is applied to the film. Since holes are provided in advance at locations corresponding to the positions of the ribs and bosses that cause damage, and the positions of the ejector bottles on the molded product, the holes can be used to fill and eject resin, preventing damage to the film and the ribs. Molded products can be obtained without deforming the boss or boss.

[Brief explanation of the drawing]

FIGS. 1 and 2 are schematic cross-sectional views of the main parts of an apparatus used in the method of integrally molding resin and film according to an embodiment of the present invention.
Fig. 1 shows a press die, Fig. 2 shows a mold die, Fig. 3 is a schematic side sectional view of the same device, and Fig. 4 is a perspective view of a molded product obtained by the same method of integrally molding resin and film. , 5th
The figure is a schematic side sectional view of an apparatus used in a conventional method. DESCRIPTION OF SYMBOLS 11... Film, 11a... Hole, L... Press mold, b... Mold mold, 15 A... Upper mold, 15
B...Lower mold, 15Bb...Concave shaped part, 16...
・Box body, 17...Boss.

Claims (1)

[Claims] 1. A method for integrally molding a resin and a film, which comprises forming holes in the film in advance at positions where the film receives local force during and after molding, before integrally molding the resin and the film.