JPH0356344Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an improvement of a molding device in a simultaneous molding transfer device that transfers a predetermined design or the like from a transfer film onto the surface of a resin molded product at the same time as molding the product.

(Prior Art) Simultaneous molding and transfer devices that simultaneously mold a resin molded product and simultaneously transfer a predetermined pattern, etc. from a transfer film onto the surface of the molded product usually include a pair of molds that can be brought into contact and separated from each other, and one of these molds is It has an injection nozzle that injects molten resin from a provided injection gate into a cavity formed between both molds, and a film supply device that feeds a belt-shaped transfer film between both molds. Both molds are closed with the current transfer portion fed in, and then molten resin is injected into the cavity, thereby performing molding and transfer at the same time.

By the way, when injecting molten resin into the cavity, the transfer film must be in close contact with the cavity forming surface of the mold (generally a female mold) on the opposite side of the mold provided with the injection gate. There is a problem in that air is trapped between the constituent surface and the transfer film, preventing the film from coming into close contact with each other, and this problem becomes particularly noticeable when the molded product is of a so-called deep drawing shape.

To solve this problem, for example, according to JP-A-61-63424 and JP-A-59-202832, an intake hole for air suction is formed in the female mold from its back to the cavity forming surface. , a configuration is shown in which the transfer film is brought into close contact with the cavity forming surface by vacuuming. In particular, the former publication describes a state in which a suction plate for feeding the transfer film between a pair of dies is movable up and down, and the currently transferred portion of the transfer film is first adsorbed to the suction plate at a position above both dies. By lowering the suction plate to the front position of the female mold, the above portion of the transfer film is sent between the two molds, and then the female mold side is evacuated as described above, while compressed air is applied from the suction plate side. It has been shown that blowing ensures that the transfer film is brought into close contact with the cavity-constituting surface of the female mold.

The latter publication also states that the current transfer portion of the transfer film is moved to the top of the female mold, it is heated with a sub-irradiation heater to soften it, and then a vacuum is applied to the cavity-constituting surface of the female mold. has been shown to improve the adhesion of transfer films.

(Problem to be solved by the invention) However, in all of the above-mentioned prior art, suction force is applied to the transfer film from the back of one mold to bring the film into close contact with the cavity-constituting surface of the mold. Since the mold has an air intake hole in its structure, traces of the air intake hole remain on the transfer surface side of the molded product, which poses a problem in the finish of the product.

Moreover, the suction force that acts on the transfer film from this intake hole is strongest at the opening of the hole, and becomes weaker and does not act evenly in areas beyond this, so that the transfer film is distorted against the cavity-constituting surface. There is also a problem in that the pattern etc. are not correctly transferred to the molded product because the molded product is in close contact with the molded product.

In view of the above-mentioned problems regarding the simultaneous molding transfer device, the present invention makes it possible to bring the transfer film into close contact with the cavity-constituting surface of the mold without providing an air intake hole in the mold, thereby leaving no trace of the air intake hole on the molded product. The purpose is to provide a molding device that leaves no residue.

(Means for Solving the Problems) In order to achieve the above object, the present invention is characterized by the following configuration.

That is, the molding device of the simultaneous molding transfer device according to the present invention is capable of displacing all or all of the cavity-constituting surface of the mold that faces the mold provided with the injection gate for molten resin, out of a pair of molding molds that can be brought into contact and separated. A portion where air is likely to be trapped between the transfer film and the transfer film is constructed using a porous material through which air can flow, such as ceramic or sintered metal. Further, if necessary, a transfer film suction means is provided which applies suction force into the cavity from the back of the porous material.

(Function) According to the above configuration, if the currently transferred portion of the transfer film is positioned between a pair of molds separated from each other and the molds are clamped and molten resin is injected into the cavity, the pressure will cause The film is pressed against the cavity forming surface of the mold that faces the mold provided with the injection gate. In this case, since all or part of the cavity forming surface is made of a porous material, air is not trapped between it and the transfer film due to its ventilation effect. Further, if a suction means is provided, the transfer film will be reliably attracted to the cavity forming surface by its suction action. Therefore, it is no longer necessary to provide an intake hole as in the past, and the transfer film can be tightly adhered to the cavity-constituting surface without causing distortion, and the molded product will not be affected as much as when the above-mentioned intake hole is provided. If traces of the pores remain on the surface, there will be no scratches.

(Example) Hereinafter, an example of the present invention will be described using the drawings.

As shown in FIG. 1, the simultaneous molding transfer device 1 includes:
It has a pair of male mold 4 and female mold 5 whose opposing surfaces are convex and concave cavity forming surfaces 2 and 3, and an injection nozzle 6 for molten resin is provided on the back of the male mold 4. Further, either one of the dies 4 and 5 is reciprocated in the front and back direction (left and right direction in the drawing) by a driving means such as a cylinder (not shown), and can be moved toward and away from the other die. There is. As shown in FIG. 2, when both molds 4 and 5 come into contact with each other, a cavity 7 of a predetermined shape is formed by the cavity forming surfaces 2 and 3, and the molten material injected from the injection nozzle 6 into this cavity 7. The resin is injected through an injection gate 8 provided in the male mold 4.

Further, as shown in FIG. 1, between the male die 4 and the female die 5, a belt-shaped transfer film 9 is supplied, which is formed by printing a large number of predetermined transfer patterns consisting of letters, designs, etc. at regular intervals. A supply device 10 is provided. This transfer film supply device 10 is composed of a feeding section 11 provided above a female mold 5 and a winding section 12 provided below the mold 5. Roll support shaft 13 that supports roll 9' of film 9
The roll 9' is driven by the motor 14.
A feed roller 15 that supplies the transfer film 9 fed out from the molds 4 and 5 to the molds 4 and 5, and a presser roller 16 that comes into contact with the roller 15 and clamps the transfer film 9.
and a guide roller 17 that guides the film 9 in a predetermined direction. Further, the winding section 12 includes a guide roller 18 that guides the transfer film 9 sent out from between the molds 4 and 5, and a motor 1.
9 to move the film 9 to both the molds 4,
The feed roller 20 and the roller 2 that are pulled out from between the
A press roller 21 that clamps the transfer film 9 in contact with the transfer film 9 and a winding shaft 22 that winds up the used transfer film 9 again into a roll are provided.

The female mold 5 has a concave cavity forming surface 3 formed by a cavity forming block 23 made of a porous material such as ceramic or sintered metal, and a space 24 is provided at the back of the block 23. It is configured to be fixed to the female mold body 25. The main body 25 is provided with a through hole 26 that communicates with the space 24.
6 is connected to a vacuum pump 27.

Next, the operation of the above embodiment will be explained.

First, the feeding section 11 of the film feeding device 10
The feed roller 15 in the winding section 12 and the feed roller 20 in the winding section 12 are driven in predetermined directions by the motors 14 and 19, respectively, so that the current transfer portion of the transfer film 9 unwound from the roll 9' is transferred to the male die 4 in the separated state. and the cavity forming surfaces 2 and 3 of the female mold 5.
The transport is stopped at the time when a predetermined positional relationship is established with respect to these constituent surfaces 2 and 3. Here, the feed roller 20 on the take-up side is driven so that its circumferential speed is slightly faster than the feed roller 15 on the payout side, and the transfer film 9 is transferred between both feed rollers 15 and 20 while maintaining a tensioned state. In addition, the feed roller 2 on the winding side
0, the winding shaft 22 is always biased in the winding direction, so that the winding shaft 22
It is designed to be automatically wound up. Further, the feed rollers 15 and 20 are stopped when the currently transferred portion of the transfer film 9 is transferred to a predetermined position and a sensor (not shown) detects a positioning mark provided on the film 9. ing.

In this way, when the current transfer portion of the transfer film 9 is fed and positioned between the pair of male molds 4 and female molds 5, one mold is brought into contact with the other mold, and both molds are 4 and 5 are performed, and the vacuum pump 27 is activated at the same time or prior to this. At this time, a negative pressure is created in the space 24 at the back of the cavity-constituting block 23 in the female mold 5, and the negative pressure is applied to the cavity-constituting surface 3 on the front surface of the block through a large number of fine holes in the block 23. and a transfer film 9 located in front of it.
An attractive force will act on it. and,
As shown in FIG. 2, the transfer film 9 is attracted to the cavity-constituting surface 3 by this suction force, and this suction force is applied to the large number of fine holes that exist throughout the block 23. Therefore, a uniform suction force is applied to the transfer film 9 on the entire surface of the cavity forming surface 3, and therefore the film 9 is not distorted on the entire surface of the cavity forming surface 3. It will be properly attached.

When the transfer film 9 has been suctioned or clamped in this manner, the molten resin A is injected from the injection nozzle 6, and is injected into the cavity 7 through the injection gate 8 of the male die 4.
The resin is cured within the cavity 7, and thereby a molded product having a shape corresponding to the shape of the cavity 7 is obtained. At the same time, the transfer layer of the transfer film 9 is adhered to the molded product by the heat and pressure of the molten resin A, and the base film of the film 9 is peeled off after the mold is opened, so that the transfer layer is attached to the surface. A transferred molded article will be obtained. In this case, since the transfer film 9 is in close contact with the cavity-constituting surface 3 of the female mold 5 without distortion due to the uniform suction force as described above, the transfer film 9 is not transferred from the film 9 to the molded product. The transfer layer or the transfer pattern will be transferred accurately without distortion, and since the above-mentioned suction force will be applied to the transfer film 9 through the many fine holes in the cavity component block 23, conventional intake holes are provided. The problem that occurs when traces of the hole remain in the molded product does not occur.

FIG. 3 shows another embodiment of the present invention, in which a transfer film heating plate 30 is provided above the pair of molds 4 and 5. The heating plate 30 has a film suction surface 32 with a plurality of intake holes 31, and has a heater 33 buried in its back, and a vacuum pump 34 is connected to the intake holes 31. Then, the vacuum pump 34 applies negative pressure to the film suction surface 32 through the suction hole 31, and while the transfer film 9 is suctioned to the suction surface 32 by this negative pressure, the heater 33 applies the transfer film 9 to the suction surface 32. The film 9 is heated. According to this, the transfer film 9 is softened before being sent between the molds 4 and 5, and the cavity forming surface 3 of the female mold 5 is softened.
This makes it possible to achieve even better adhesion to the surface.

Further, as shown in FIG. 4, the heating plate 30 as described above is positioned in front of the female mold 5 and can be inserted between the female mold 5 and the male mold 4, and the heating plate 30 If the configuration is such that a vacuum pump 34 and a compressed air pump 35 are connected to the intake hole 31 via a switching valve 36, the transfer film 9 can be connected to the heating plate 30.
After being adsorbed onto the adsorption surface 32 of the transfer film 9 and heated and softened, the transfer film 9 is transferred to the female mold 5 using a compressed air pump 35.
It is also possible to blow it to the side and use the suction force from the back of the female mold to bring it into closer contact with the cavity-constituting surface 3 of the mold 5 more reliably.

Furthermore, the heating plate 30 in the embodiment shown in FIG. 3 or 4 may be configured as shown in FIG. 5. That is, this heating plate 40 includes a suction surface constituting block 42 made of a porous material such as ceramics or sintered metal, which constitutes a film suction surface 41, and
2, and a heater 44 is embedded in the main body 43. and,
An air passage 45 is provided between the back surface of the block 42 and the main body 43, and a vacuum pump is connected to the passage 45, or a vacuum pump and a compressed air pump are connected via a switching valve.

According to this heating plate 40, the suction force applied to the currently transferred portion of the transfer film by the vacuum pump acts equally on the entire surface of the suction surface 41,
Further, when the transfer film 9 is blown by the compressed air pump, the blowing force is applied evenly to the above portions. Therefore, the transfer film 9
This time, the heating or softening of the transfer portion is performed evenly and uniformly, and the portion is brought into closer contact with the cavity forming surface 3 of the female mold 5.
Note that the air passage 45 at the back of the suction surface forming block 42 must be provided so as not to impede heat transfer between the block 42 and the main body 43, but even with such a passage, the block 42 Since it is made of a porous material, the suction force or spray force against the transfer film 9 can be applied evenly to the suction surface 41. In the above embodiment, the vacuum pump 27 is omitted when the pressure of the molten resin injected into the cavity causes the air between the transfer film and the transfer film to be exhausted through the fine holes in the cavity component block 23. Alternatively, the cavity-constituting block 23 may be provided only at a portion of the cavity-constituting surface 3 where air is likely to be trapped.

(Effect of the invention) As detailed above, according to the invention, the adsorption of the transfer film to the cavity forming surface of the mold opposite to the mold provided with the injection gate is achieved between the cavity forming surface and the transfer film. This eliminates the air entrapment in the film and allows the film to adhere well to the constituent surface. Therefore, it is no longer necessary to create intake holes on the cavity component surface as in the past, and this eliminates the problem of leaving traces of the intake holes on the molded product, as well as creating strong suction force locally on the transfer film. Distortion of the film due to the action of the film is prevented, and patterns, etc. can be transferred from the film to the molded product in a good manner.

[Brief explanation of the drawing]

The drawings show an embodiment of the simultaneous molding and transfer device according to the present invention, and FIG. 1 is a longitudinal sectional side view of the device;
FIG. 2 is an enlarged longitudinal sectional side view of the main part showing the state at the time of resin injection, and FIGS. 3, 4, and 5 are longitudinal sectional side views of the main part showing other embodiments of the apparatus. 1... Simultaneous molding transfer device, 2, 3... Cavity configuration surface, 4, 5... Molding mold (male mold, female mold), 6
... Injection nozzle, 7 ... Cavity, 8 ... Injection gate, 9 ... Transfer film, 10 ... Film supply device, 23 ... Cavity component block made of porous material, 27 ... Vacuum pump (transfer film suction means) ).

Claims (1)

[Scope of utility model registration request] A pair of molds that can be brought into contact and separated, an injection nozzle that injects molten resin from an injection gate provided in one of these molds into a cavity formed between the molds, and a transfer film between the molds. In the simultaneous molding transfer device, the simultaneous molding transfer device has a film feeding device that feeds a resin molded product in the cavity and at the same time transfers a design etc. from the transfer film to the surface of the molded product, the injection gate is provided. 1. A molding device for a simultaneous molding and transfer device, characterized in that all or part of the cavity forming surface of the mold facing the mold is made of a porous material through which air can flow.