JPS60161122A - Simultaneous injection molding and decorating device - Google Patents

Abstract

PURPOSE:To manufacture a molded piece, the rugged pattern of which precisely coincide with the decorative patterns of a sheet, by a method wherein the sheet with decorative patterns thereon is forwarded once every fixed distance into the cavity of an injection molding machine and, after that, one shot of injection molding is performed. CONSTITUTION:Firstly, a sheet 3 is heated by a heating device 25 while being sucked by a suction device equipped with air vents 26 and 27. Secondly, a cylinder 21 is put into actuation so as to shift a sheet forwarding device 4 along a rail 19 between a female mold 1 and a male mold 2. The sheet 3 is run from a feed roll 14 side to a take-up roll 15 side by one pitch distance together with said shifting of the device 4. Thirdly, the female mold 1 is closed by a cover member 24 so as to evacuate the air in the female mold 1 through the air vents 26 and 8 in order for the sheet 3 to adhere onto the inside surface of the female mold 1. Fourthly, the female mold 1 is shifted by a ram 5 so as to join with the male mold 2. Finally, molten resin is injected through an injection hole 12 into a cavity, resulting in obtaining a molded piece with decorative patterns, which are formed on the sheet 3 and coincide with the rugged pattern of the molded piece.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an injection molding simultaneous painting device that performs painting at the same time as injection molding, and is particularly suitable for manufacturing molded products having fine irregularities or reverse tapered undercuts on the surface. This invention relates to an injection molding and simultaneous painting device.

Conventionally, in order to perform painting at the same time as injection molding using an injection molding simultaneous painting device, for example, a soft sheet with a printed pattern is preformed by pressing it into a female mold under vacuum or pressure, and then the female mold and the male mold are The entire mold is clamped, and molten resin is injected from the male mold side into the cavity formed between these molds.
The soft sheet i is attached to the surface of this injection resin.

However, in order to obtain a molded product with a soft sheet adhered to its surface that has relatively small irregularities on the surface or has an inversely tapered undercut, it is necessary to consider mold release, etc. There is a problem that the mold has to be split into split molds, making the entire device larger and more complicated.

In view of the above, the present invention has been developed to provide a simple structure that enables molding of molded products having small irregularities or reverse tapered undercuts on the surface with the desired accuracy without using split molds or the like. The purpose is to provide an injection molding simultaneous dispensing device.

In order to achieve this objective, the present invention involves feeding a continuous thermoplastic sheet between a male mold and a female mold, clamping the molds, and then injecting molten resin into the mold, thereby achieving painting at the same time as molding. In the injection molding simultaneous painting device,
A high frequency embossing device is installed in the cavity surface of the female mold, and an injection device is installed in the male mold, and the sea if
The sheet is fed between the male mold and the female mold while being held by a sheet feeding device, and this sheet feeding device is capable of forward movement between the position where the sheet t is gripped by the driving member of the cylinder and the position where the sheet is fully loaded onto the female mold. The general outline of the system is to include a sheet adsorption device that adsorbs the sheet and a sheet heating device that heats the adsorbed sheet.

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, the injection molding simultaneous painting device of the present invention has a female mold and a male mold that are placed opposite each other, and a thermoplastic sheet 3 having a pattern extends between these two molds. is fed onto the female mold at a fixed pitch by the sheet feeding device μ.

The female mold l is connected to the pressurizing ram j through a moving plate 6' (I-), and an ejector 7 is provided with a protruding bin (not shown) for ejecting the entire molded product out of the mold after injection molding.
It is equipped with Further, the female mold 1 has a vacuum opening ♂ for pre-forming the sheet 3, and a high frequency embossing device 10 connected to a high frequency generator is provided on the cavity surface of the female mold 1. This embossing device io is plate-shaped
None, a part of which has an uneven molding part 10a for forming an uneven or reverse tapered undercarriage on the surface of the molding surface.
is provided. Since high frequency waves are emitted from the embossing device io, the soft sheet TF or molten resin attached to it is heated uniformly, and it is possible to blend it into even the fine irregularities on the mold surface, enabling precise molding. . With heater heating, heat is not evenly transmitted to the sheet, etc., and the entire unevenness of the mold surface cannot be heated uniformly, so injection molding cannot be performed on a dense molding surface, but high-frequency heating can eliminate these drawbacks.

The male die is fixed to a fixed platen, an injection hole for molten resin is bored in the male die, and an injection device 13 faces the opening at the rear end of the injection hole 12.

The upstream side of the sheet 3 is wound around an unwinding roll /Q-, and the downstream side thereof is wound around a winding roll 15, and feeding and winding thereof are performed by guide rollers /6. /A. Furthermore, as shown in FIG. 2, a desired pattern 17 is printed on the sheet 3 at a fixed pitch, and positioning marks/marks are also printed at a fixed pitch, and if the sheet 3 is for reverse printing or transfer, the printed surface is set so that it is on the opposite side from the female mold l,
Conversely, in the case of front printing, the printing side is set so that the printing side is on the cavity surface of the female mold.

On the other hand, one guide rail /
q are provided, and the sheet feeding device 9 reciprocates along these rails/q.

The sheet feeding device has a frame 9, the legs of which are guided by guide rails 19.

The frame 20 is connected to a rod n of a cylinder which is a driving device for moving the sheet feeding device 9 lI forward and backward. The rail /q has a substantially U-shaped frame member J.
is attached to be slidable, and this frame part is connected to the lid member J through a member (not shown) so as to be able to move toward and away from each other, and the movement of these two members (u, 21) toward and away from each other is performed by a cylinder (not shown). Ru. A heating device j for heating and softening the sheet 3 is provided inside the lid member J, and a ventilation hole J and 27 for evacuation or blowing out compressed air are formed in this heating device J. This ventilation hole U also serves as a suction device for the sheet 3.

Further, the sheet feeding device ≠ is provided with a sensor plate that comes from a phototube or the like that detects the size/gf printed on the sheet 3, and a frame member n and a lid member J are placed at a position where this sensor 2g can detect the mark/gf. A vertical and horizontal movement mechanism using a servo motor (not shown) or the like is provided so that both members J can be moved integrally.

J is movable vertically and horizontally via an intermediate member Ja.

The sheet feeding device Hiroshi is attached to the moving plate B of the female die L.
A rod member 2q for closing the open lower end of the frame member when positioned above is connected, and together with this rod member 2q, the sheet 3
The rod member 30 that clamps the movable plate 6 is movable in the left and right direction.
Vr-Supported.

Next, the operation of the injection molding simultaneous decoration device will be explained.

First, in the state shown in FIG. 1, the lid, frame, 2J,
! tl moves the sheet 3 to the position where it is detected. Next, the lid member J moves toward the frame member JO by the action of a cylinder or the like (not shown), and the sheet 3 is sandwiched between the frame member and the lid m.
It is adsorbed onto the heating device Δ by means of a vent hole (easy, near).

Thereafter, as shown in FIG.
Move it along / to between the female mold / and the male mold 2. In response to this operation, the sheet 3 travels from the unwinding roll 15 side to the winding and roll 15 side by / pitch.

Further, the sheet 3 of fc/pitch held between the frame member J and the art member J is heated and softened and wetted while the sheet feeding device ≠ moves between the female mold and the male mold. This state is shown in FIG.

When the female mold 1 is sealed by S or J, the sheet 3 is preformed as shown in FIG. During preforming, compressed air is first exhausted from both the vents 1r and 2A, and then compressed air is cut off from the vent J. In this way, the sheet 3 is pressed against the inner surface of the female mold.

In addition to the above-mentioned means, compressed air is sent through the ventilation holes and exhausted through the ventilation holes g, but in this case, it is necessary to provide a large number of ventilation holes g at every corner of the mold. On the other hand, according to the former method, air remains in the female mold during preforming, so there is no need to provide a large number of ventilation holes fi, and there are no traces of the ventilation holes r on the surface of the molded product after molding. I never get it.

When the preforming is completed, the lid member 2t is moved away from the frame member J by the operation of a cylinder (not shown), and the sheet feeding device t included in the lid member J and the frame member J' is moved away from the frame member J' by the operation of the cylinder 2/. Return to original position.

After that, as shown in FIG.
The liquid is injected from the injection hole into the cavity. Then, the sheet 3 is pressed by the molten resin 31 against the high frequency embossing device 10 in the female mold, and is embossed. This embossing molding is continuously performed from the time of injection molding to the completion of injection molding. At this time, the sheet 3 and the surface 1 of the molten resin are softened by the high frequency and conform to the cavity surface, so that even small irregularities can be accurately molded.

Then, if the molten resin 3/ is cooled and solidified.

The male die is moved back to release the mold, and the ejector 7 of the female die is activated to extrude the molded product from inside the female die. During this extrusion, the sheet 3 is
Remove the molded product from Y! ! take.

On the other hand, as shown in FIG. 6, the extruded molded product 32 has the sheet 3 integrally adhered to the surface of the resin, and the uneven portions of the molded product 3 and the pattern /7 of the sheet 3 are in sync. Become.

In addition, 33 in the figure is a letter. As mentioned above, in the present invention, a high frequency embossing device is incorporated into the female cavity surface of the simultaneous injection embossing device, so there is no unevenness or reverse tapered underside on the surface. A molded product with many cut parts can be easily molded without using a split mold. Furthermore, since the sheet can be fed at a constant pitch, it is possible to accurately match the irregularities of the molded product with the pattern on the sheet.

[Brief explanation of drawings]

FIG. 7 is a longitudinal cross-sectional view of the injection molding simultaneous painting device according to the present invention, FIG. 2 is a plan view showing a part of the sheet, and FIG. 3 is similar to FIG. 1 showing the state in which the sheet is fed between the molds. Fig. G is a vertical sectional view of the mold showing the state during preforming, Fig. J is a longitudinal sectional view of the mold showing the state of injection molding, and Fig. FIG. /...female type, λ...male type, 3...sheet, Hiro...
・Sheet feeding device, 10... Embossing device, 13...
・Injection device, 2/... cylinder, J... frame member, J
...Lid member, 2g...sensor. Applicant's agent: Inomata Figure 1 Figure 3 Figure 4 Procedural amendment May 1980 Director-General of the Patent Office Kazuo Wakasugi 1 Indication of the case 1982 Patent application No. 15875 2 Name of the invention Injection molding Simultaneous drawing device 3 Relationship with the case of the person making the amendment Patent applicant (289) Dai Nippon Printing Co., Ltd. 4 Agent 3-2-3 Marunouchi, ChiyotTJ-ku, Tokyo Telephone Tokyo (2)
11) "Detailed Description of the Invention" column of the 2321 representative specification.

Claims (1)

[Claims] 1. An injection method in which painting is performed simultaneously with molding by feeding a continuous thermoplastic sheeter between a male mold and a female mold, clamping the mold, and then injecting molten resin, etc. into the mold. In the simultaneous molding and decorating device, a high-frequency embossing device is installed in the cavity surface of the female mold, and an injection device is installed in the male mold, and the sheet is fed between the male mold and the female mold while being held by the sheet TF sheet feeding device. The feeding device is capable of reciprocating between a position where the sheet is gripped by a driving member such as a cylinder and a position where the sheet is fed onto the female mold, and also has a sheet suction device that suctions the sheet and a sheet heating device that heats the suctioned sheet. An injection molding and simultaneous painting device that is characterized by having a device. λA positioning mark is provided on the thermoplastic sheet in addition to the pattern, and this mark is detected by a sensor attached to the sheet feeding device, and the sheet feeding device grips the sheet at a predetermined position relative to the pattern, and then the sheet is moved. The injection molding and simultaneous painting device according to claim 1, characterized in that the device is fed onto a female mold.