JPS63128917A - Production equipment of foil-decorating molded item - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an apparatus for manufacturing a decorated molded product that is capable of painting the surface of a three-dimensional molded product simultaneously with molding.

[Conventional technology]

Conventional 2 methods of adding letters and patterns to synthetic resin molded products:
A pre-painted painted film made of thermoplastic synthetic resin, etc. is given the same shape as the molded product by vacuum forming, pressure forming, vacuum pressure forming, etc., and this molded painted film is placed in a female mold for injection molding, and the resin is There are known methods of producing a decorated molded product by injection molding and integrating it with a decorated film, or by transferring the ink of the decorated film onto the surface of the molded product. In addition, as a method to easily carry out this method,
Publication No. 2-2 also proposes a method in which vacuum forming of a decorated film and injection molding of a resin are performed in the same female mold.

However, even in the method disclosed in the above-mentioned publication, a sheet of painted film with a pattern printed thereon is manually attached to the female die of the injection molding machine each time the molding is performed, which is inefficient and has poor productivity.

Therefore, the applicant of the present invention developed a device that continuously supplies a roll-shaped continuous film with a pattern printed thereon to the female mold of an injection molding device, and published Japanese Patent Application Laid-Open No. 1987-142398 (1983-1983). A patent application was filed as No. 31130).

In the device disclosed in this patent application, a part of the decorated film is unrolled from a roll of a strip-shaped decorated film on which a large number of pictures are printed in the corners for a certain period of time, and a heating plate and a frame member are applied to the decorated film. Move the film in the longitudinal direction (travel direction) and position it at a predetermined position with respect to the pattern.
Next, the picture part is held between the heating plate and the frame member, and in this state, the heating plate and the frame member are moved in the longitudinal direction of the film (at this time, the film is pulled out from the roll), and the picture part is A film is placed on the cavity surface of a female mold for vacuum forming and injection molding, and then a heated and softened film is attached to the molding surface of the female mold by vacuum forming, and then the heating plate and the frame member are sandwiched together. Cancel it.
The frame member and frame member are returned to their original positions in order to hold the next pattern part, and the male mold is engaged with the female mold with the filler attached to the molding surface, and molten resin is injected. The resin and the painted film are integrally molded, and by repeating the reciprocating motion of the heating plate and frame member, each patterned part of the rolled painted film is intermittently molded one after another into a female mold. can be supplied to the cavity surface, increasing production efficiency.

[Problem that the invention seeks to solve]

However, in such conventional devices, the decorative film used is one that is relatively weak against heat, such as a thin film.
When using IiJ, <40″′″lOOμ) 1
0' - If the positioning accuracy of the pattern deteriorates, it will be difficult! It was found that this occurs. That is, in the conventional apparatus, the heating plate and the frame member are moved along the painted film to position the heating plate and the frame member at a predetermined position relative to the supply film.

It has been found that the painted film before being held between the heating plate and the frame member is heated by the heating plate and expands and contracts, which hinders accurate positioning.

The present invention has been made based on this knowledge, and an object of the present invention is to provide an apparatus for manufacturing decorated molded products that enables accurate positioning and alignment while using a plastic film.

[Means for solving problems]

The present invention, which was made to solve the above problems, uses a female mold equipped with a cavity for vacuum forming or pressure forming.

a film feeding device that conveys a long illustrated film printed with a predetermined pattern through a position opposite to the cavity of the female mold, and positions the predetermined pattern at a position opposite to the cavity; a heating plate movable between a standby position laterally removed from the running path and a position covering the cavity via the painted film, the heating plate cooperating with the female mold to perform vacuum forming or pressure air forming of the painted film; The gist of the present invention is an apparatus for manufacturing a decorated molded product, which includes a resin injection means for injecting a molding resin into the female mold after vacuum or pressure molding a decorated film.

[Effect]

According to the device configured as described above, the predetermined pattern portion of the decorated film is positioned at a predetermined position with respect to the cavity of the female mold by the film feeding device while the heating plate is in the standby position out of the running path of the decorated film. At this time, since the decorated film is separated from the heating plate, it is not heated and hardly expands or contracts due to heating, so accurate positioning is possible. After positioning the pattern part of the painted film in the female mold cavity.

Move the heating plate from the lateral direction to a position covering the cavity, attach a painted film to the inner surface of the female mold by vacuum or pressure forming, and then return the heating plate to its original standby position.
A painted resin product is molded by engaging the mold Ill with a male mold for resin injection and injecting resin into the cavity. After that, the female mold is opened from the male mold, the molded product is taken out, and the painted film is again moved by 1 pisodji of the pattern to position the 9th pattern part in the cavity of the female mold, and the same operation is performed thereafter. By returning it, painted molded products can be manufactured continuously.

〔Example〕

The present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a side view of the apparatus of the embodiment as viewed in the direction of the arrow nn in FIG. In the figure, 1 is a female mold for injection molding that can be vacuum-formed or pressure-formed, and is provided with a cavity 1A and a vacuum suction port (not shown) that communicates the cavity 1 with a vacuum suction device. . 2 is a male mold provided corresponding to the female mold 1; 3 is a movable plate that holds the female mold 1 and is movable toward the male mold 2; 4 is a fixed plate that holds the male mold 2; and 5 is a melting plate. These are resin injection holes, and these constitute a part of a resin injection molding apparatus.

6 is a decorated film made of a transfer film arranged to run between the female mold 1 and the male mold 2, 7 is an unwinding roll for feeding out the decorated film 6, 8 is a winding roll for the decorated film 6, and 9 is a It is a guide roller. A drive device (not shown) is connected to the take-up roll 8, and by rotating the take-up roll 8 with the drive device, the painted film is taken up and fed out from the roll 7, and is drawn into the cavity l of the female mold 1.
It is designed to run in a position facing Δ. Also 5
The take-up roll 8 is movable in the lateral direction with respect to the running direction of the film J, and the film running position can be adjusted in the lateral direction. This painted film 6 is a base film on which a pattern to be painted on a molded product is printed so that it can be transferred with a predetermined pinch.

Furthermore, positioning marks 10 in the feed direction and positioning marks 11 in the lateral direction are printed with a constant pinch. 12°13
are mark detectors that detect positioning marks 10 and 11, respectively, and the outputs of mark detection RH2 and RH13 are used to control the drive device for the winding roll 8 and the device for moving the winding roll 8 in the lateral direction. used. That is, the painted film 6 is moved by the one-winding roll 8 to a position facing one person in the cavity.

The mark detector 12.13 is positioned and stopped at a position where it detects the positioning mark 10.11. At this time, the patterned portion of the painted film 6 is positioned at a predetermined position facing the cavity. Therefore, 8. Take roll8. Guide roll9. Mark detectors 12, 13, etc.
A film feeding device is configured for transporting a decorated film through a position facing the female cavity IA and positioning a predetermined pattern at a position facing the cavity.

Reference numeral 15 denotes a heating plate having a size to cover the cavity 18 of the female mold 1, and can be moved by an air cylinder 16 to a standby position where it is removed laterally from the running path of two painted films and a position where it covers the cavity via the painted film. It is. Furthermore, an air cylinder (-U shown in the figure) for moving the heating plate 15 from the position shown in FIG. 1 toward the female mold 1 is also connected to the heating plate 15. The heating plate 15 has an air permeable portion having a large number of ventilation holes 17 on the side facing the painted film 6, and the ventilation holes 17 are connected to a vacuum source and the like through a switching valve (not shown). Connected to a compressed air source.

Therefore, by applying vacuum suction through the many ventilation holes 17, the decorated film can be adsorbed and held on the heating plate 15, and by supplying compressed air, the decorated film can be peeled off from the heating plate and pushed onto the inner surface of the cavity. It is possible to attach it. Note that in order to make the portion of the heating plate facing the film breathable, it is not limited to providing a large number of ventilation holes 17 as shown in FIG. 1, but a porous material such as sintered metal may be provided.

Next, the molding operation by the apparatus having the above configuration will be explained.

As shown in FIG. 2, the eight take-up rolls 8 are
The illustrated film 6 is conveyed by the mark detection 231.
The illustrated film 6 stops at the position where the positioning mark lO in the feeding direction of the illustrated film 6 is detected by 2.

Note that at this time, the mark detector 13 detects the positioning mark 11.
is monitored, and the lateral position of the illustrated film 6 is always adjusted by the lateral movement of the take-up roll 8. In this way, one picture of the painted film 6 is precisely positioned at a predetermined position facing the cavity IA of the female mold l.

Next, the heating plate 15 is moved to the female mold 1 by the air cylinder 1G.
The film 6 is moved to a position facing the cavity IA, and is then pressed against the * mold 1 by an air cylinder (not shown) as shown in FIG. 3, and the decorative film 6 is sandwiched between the female mold 1 and the heating Fi 15. At this time, the numerous ventilation holes 17 of the heating plate 15 are vacuum-suctioned, and the decorated film 6 is attracted and held by the heating plate, and is heated and softened by the heating plate. In parallel with the heating by heating +ff115, the inside of the cavity 1 is evacuated, and when the decorated film 6 is sufficiently heated and softened, compressed air is supplied to the ventilation hole 17 of the heating plate 15. As a result, the decorated film 6 is instantaneously deformed and pressed against the inner surface of the cavity, as shown in FIG. 4, and is molded into a shape that matches the inner surface of the cavity.

Note that it is also possible to supply compressed air to the ventilation hole 17 of the heating plate 15 without evacuating the inside of the cavity, and to press and mold the painted film 6 against the inner surface of the cavity using only the compressed air. In order to discharge residual air within the cavity, it is necessary to provide a large number of exhaust holes on the inner surface of the cavity, and there is a risk that traces of the large number of exhaust holes may remain on the surface of the molded product. From this point of view, it is preferable to evacuate the inside of the cavity in advance as described above, and it is also possible to heat the decorated film 6 without vacuum adhering it to the heating plate 15. However, if a method is adopted in which the heating plate 15 is vacuum-adsorbed and the vacuum is turned off and the compressed air is applied at the same time to instantaneously press the decorated film 6 against the inner surface of the cavity, the design of the decorated film 6 becomes unstable. A good pattern can be obtained without distortion.

After the painted film 6 is attached to the inner surface of the cavity 1A as shown in FIG.
The female mold 1 is advanced by the movable platen 3 and combined with the tiji mold 2, and molten resin is injected into the cavity IA from the injection hole 5. The injected and molded molten resin is cooled.

After solidification, the mold 1 is moved back from the male mold 2 and opened, and the molded product inside is discharged. At this time, the molded product is peeled off from the painted film 6, but the pattern of the painted film is transferred to the surface of the molded product, and as shown in FIG. Product 22 is obtained.

One molding operation is completed above, and the same operation is repeated thereafter to continuously manufacture decorated molded products.

The base film constituting the painted film 6 used in the above example has dimensional stability during printing with an elongation rate of 0.1% or less at the drying temperature during printing, and 110
It has good vacuum formability at temperatures around 0°C.

It is preferable to use a material that has heat resistance such that it will not melt even if it comes into contact with a molten resin of 140° C. or higher injected from an injection molding machine. The thickness of the base film is not particularly limited, and since it is not affected by the heat from the heating plate during film positioning, a thin film that is easily affected by heat (for example, about 40 to 100μ) can also be used. It is.

The ink used for printing the pattern is preferably one with good elongation so that it can follow the elongation of the film when forming the patterned film, and the vehicle contains a pigment or dye colorant, a plasticizer, stabilizer.

Other additives, solvents, or diluents are used as the vehicle, such as cellulose derivatives such as ethyl cellulose, ethyl hydroxyethyl cellulose, cellulose acetate propionate, cellulose acetate, polystyrene, polyα-methylstyrene, etc. styrene resin and styrene copolymer resin.

Polymethyl methacrylate, polyethyl methacrylate.

Single or copolymer resin of acrylic or methacrylic resin such as polyethyl acrylate and polybutyl acrylate.

Rosin ester resins such as rosin, rosin-modified maleic acid resin, rosin-modified phenol resin, and dipolymerized rosin.

One or more of polyvinyl acetate resin, coumaron resin, vinyltoluene resin, vinyl chloride resin, polyester resin, polyurethane resin, butyral resin, etc. is selected and used. In particular, a mixture of vinyl chloride resin and acrylic resin is preferred.

Using the apparatus described in the above example, PVC (non-plasticized, non-stretched, thickness 40μ) and 6-N were prepared as the painted film 6.
ylon (unstretched, thickness 20μ) is used as a base material, and the composite film is coated with Showa Ink θ Kiku's TAC3 (salt pyro 0%).

When I used screen printed chino (40% acrylic) and performed continuous molding (injection and painting at the same time),
A molded product with good accuracy (accuracy: ±0.5 am or less) could be obtained.

Although a transfer film was used as the painted film in the above embodiment, the painted film used in the apparatus of the present invention is not limited to this, and can be directly bonded to the surface of the molded product to form the surface of the product. It may also be an overlay film. When using such an overlay film, after injection molding of the resin, the portion integrated with the molded product may be punched out from the painted film using a cutter provided in an M-type or female mold.

Furthermore, in the above embodiment, the molded product is manufactured by injecting the molten resin into the cavity of the female mold, but the present invention is not limited to this configuration. You can also do this. As the reactive liquid resin that can be used here, any resin that reacts and hardens after being injected into the cavity 1, for example, a thermosetting resin.

Room temperature curable resins etc. can be used, and more specifically, RI M (Reaction
Examples include resins for injection molding, methacrylic resins, unsaturated polyester resins, and casting resins such as epoxy resins.

〔Effect of the invention〕

As explained above, in the present invention, the pattern is marked 1111L at a predetermined pitch, and while the film is waiting at the position where the heating plate has cut the pattern from the patterned film, the pattern is The positioning of the painted film is extremely accurate, as the molded film is formed by positioning the film so that it is in a predetermined position relative to the cavity of the female mold, and then moving the added material over it to form the painted film. Even if a thin film, which is easily affected by heat, is used, it is possible to obtain a molded product in which the pattern is well aligned.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing an embodiment of the present invention, FIG. 2 is a side view of the device shown in FIG.
FIGS. 4 and 5 are sectional views of essential parts for explaining the operation of the above-mentioned apparatus, and FIG. 6 is a perspective view showing a decorated molded product manufactured by the above-mentioned apparatus. 1 - Female mold 18 - Cavity 2 Male mold 3 Movable plate 4 - Fixed plate 5 - Film with resin injection holes 6-12 7 - Unwinding roll 8 - Winding roll 9 Guide roll 10.11 - Positioning mark 12 .13 - Mark detector 15 - Heating plate 16 - Air cylinder 17 - Vent agent Patent attorney Kyo Matsu 3 Figure 1 Fang 3 Figure 4 Figures 3 and 2 Fang 5 9'b'

Claims (1)

[Claims] A female mold having a cavity for vacuum forming or pressure forming, and a long decorative film printed with a predetermined pattern are conveyed through a position opposite to the cavity of the female mold,
a film feeding device for positioning a predetermined pattern at a position facing the cavity, a heating plate movable to a standby position laterally removed from the running path of the painted film and a position covering the cavity via the painted film, A decorated molded product comprising: a heating plate that performs vacuum forming or pressure air forming of the decorated film in cooperation with the female mold; and a resin injection means that injects a molding resin into the female mold after vacuum forming or pressure forming the decorated film. manufacturing equipment.