JPS59202832A - Foil decorating process by vertical injection molding and foil decorating device thereby - Google Patents

Abstract

PURPOSE:To cause the printed pattern of a decorated sheet to synchronize exactly with the unevenness on a molded product by a method in which at the preliminarily molding of the decorated sheet for a mold, the decorated sheet is uniformly heated and the heated sheet is set in the mold as it is without transferring said sheet. CONSTITUTION:When the mark 21 of the decorated sheet 14 transferred onto a female mold 2 is detected by a sensor 22, the motor 18 driving a wind-up roller 16 is stopped by a controlling device, and the decorated sheet 14 is kept on the female mold 2. The decorated sheet 14 is clamped by a frame member 23, and a radiation heater 25 is moved onto the decorated sheet, operating a cylinder 24, whereby the decorated sheet 14 is softened. Next, the softened sheet 14 is adsorbed on the cavity surface of the female mold 2 by vacuum suction from the air hole of the female mold 2, and preliminarily molding is carried out. After the preliminarily molding has been finished, a male mold is lowered and combined with the female mold 2. Simultaneously, when molten resin is injected into the cavity of the mold from an injection cylinder 13, the decorated sheet 14 adhers by itself to the injected resin in the cavity or the ink of the decorated sheet is transferred onto the injected resin.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertical injection molding pre-painting method and apparatus which performs all the painting at the same time as injection molding.

Molten resin is injected into a cavity formed by clamping a male mold and a female mold to obtain a product of a predetermined shape (i: To obtain a product, for example, a painted sheet is preformed in the female mold in advance, and the product is Put the illustrated sheet itself on the surface of K1, or
Alternatively, it is known that ink printed on a picture sheet is transferred to the entire surface of the product.

Conventionally, such a painting device has been used to sandwich a painting sheet between both molds of a structural injection molding machine.
There is something disclosed in the issue. However, %Kaisei 48-
The method shown in No. 48760 cannot be applied to objects with deep rises, and the method shown in Japanese Patent Application Laid-open No. 56-2148, which was cut, heats a printed sheet (printing film) outside the female mold to soften it. Although we try to move the sheet to the softened female mold, it is difficult to move the painted sheet due to sheet drop-down (deflection due to softening).

When using a tub-type injection molding machine, the painted sheet is placed vertically facing both molds, so when using a double-injection heater such as an infrared heater, the temperature difference between the top and bottom of the sheet increases due to convection. There is a problem that uniform preforming cannot be performed.

For this reason, a method of directly and uniformly heating the painted sheet using a heat panel has been considered, but this method has the disadvantage of increasing the size of the heat panel itself.

- To apply decoration, it is necessary to match the printed pattern on the decoration sheet with the unevenness of the molded product.
Alternatively, the sheet feed was set by feeding back what was detected by the photocell gutter to an oil cylinder or the like.

However, such a method not only complicates the structure, but also yrf! It also had the disadvantage of being inferior.

The present invention was made in view of the above-mentioned problems with the conventional decorating apparatus, and its purpose is to uniformly heat the decorated sheet during preforming of the decorated sheet to the mold, and to heat the heated sheet. To provide a method and device for decorating in shape injection molding, which can be set in a mold as it is without being moved, and can precisely synchronize the pattern of a decorated sheet with the irregularities of a molded product.

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

FIG. 1 is a partially cutaway side view of the painting device according to the present invention, and FIG.
The figure is a sectional view taken along line 1-II in FIG. 1, and a fixed female mold 2 is mounted on a fixed platen 1. This female mold 2 is provided with a ventilation hole 3 for evacuation. Further, struts 5...5 are erected at the corners of the fixed platen 1, strut plates 6'rlihJ are set at the upper ends of these struts 5, and the cylinder unit 7 is mounted on the strut plates 6. There is.

A movable &9 is attached to a ram 8 which is moved up and down by a cylinder unit 7, and the support column 5 is inserted through the movable plate 9, and a movable male die 10 is attached to the lower surface of the movable plate 9. This male die 10 has an injection hole 11 for molten resin, and a through hole 12 through which an ejector turbine for ejecting the molded product is inserted. Then,
When the male mold 10 is fully lowered and the molds are mated with the female mold 2, the tip of the injection cylinder 13 and the injection hole 11 match, and the molten resin in the injection cylinder 13 passes through the injection hole 1 and is injected into the injection hole. .

Still, in front and behind the female die 2 (in the vertical direction of the paper in FIG. 2), there are disposed a feed-out row 215 and a take-up row 216 for the illustrated sheet 14 on which predetermined designs are printed at regular intervals, and these rollers 15, 16' It is rotated by motors 17 and 18, such as a servo motor with an i-brake or a nurapping motor, which can reduce the nuppede in stages. And the painted sheet 1 stretched between the rollers 15 and 16
4 is positioned above the female mold 2 by guide rollers 19,20. Marks 2J are displayed on the illustrated sheet 14 at regular intervals, and sensors 22 for detecting the sounds of the marks 2J are provided at two locations in the front and back of the illustrated sheet 14 in the feeding direction. As this sensor 22, any reflective or transmissive optical sensor is used.

Further, a frame member 23 is provided along the periphery of the upper surface of the female mold 2. The frame member 23 consists of a fixed leg 230 fixed to the female mold side and a movable frame 23a that is movable by an air cylinder (not shown). Another cylinder 24 is arranged on the side of the female mold 2 opposite to the cylinder 13, and a bi-injection heater 25 is attached to each cylinder.
As each cylinder performs a protruding movement, the double-shot heater 25
is moved along the guide rail A to above the pictured sheet 14.

Next, the operation of the painting device according to the present invention will be described.

First, the mark 2 on the painted sheet 14 conveyed over the female mold 2
1 is detected by the sensor 22, the motor 18 that drives the take-up roller 16 is stopped by the control device, and the illustrated sheet 14 is held on the female mold 2. In this case, the motor 17 that drives the delivery row 215 has a torque for controlling the tension at a constant level. Occur. Thereafter, the frame member 23 is used to wrap the decorative sheet 14 so that the female mold 2 is hermetically sealed. Then, the cylinder 24 is turned on to move the double-shot heater 25 onto the illustrated sheet 14, and the illustrated sheet 14 is softened.

Next, the decorated sheet 14, which has been softened by drawing a vacuum through the air holes 8 of the female mold 2, is adsorbed onto the cavity surface (molding surface) of the female mold 2, and preforming is performed.

In addition, if you blow from the vent hole 8 using the switching valve provided in the female mold before vacuuming from the vent hole 8, even if the sheet is stretched out, the vacuum can be drawn. Preforming can be carried out accurately.

After the above preforming is completed, the male mold 10 is lowered and combined with the female mold 2, and at the same time, molten resin is injected into the cavity from the injection cylinder 13.

Then, the painted sheet 1 is placed on the injected resin inside the cavity.
4 itself adheres, or the ink of the illustrated sheet 14 is transferred to the resin. In addition, if the pattern of the patterned sheet 14 is front printing, the patterned sheet 14 is set so that the printed surface faces the cavity surface of the female mold 2, and if the pattern is for printing or transfer, the printed surface is Set it so that it faces the male mold 10.

In this way, after injection molding between the molds, it is held for a predetermined time,
Next, raise the male size by 10. Then the molded product is male mold 1
Since it rises with zero, it is ejected from the male mold with an ejector turbine. Thereafter, a molded product is punched out from the painted sheet 14 using a mold blade to obtain a product 26 as shown in FIG. The design of the convertible sheet 14 matches the uneven portion 27 or the character 28 of the product 26.

Next, specific examples will be described below.

As the example illustrated sheet, N was applied to the back side of the ABS500μ sheet.
The acrylic resin containing 1 powder or 70 or more Cu powder was coated with 30 to 50 microns using a roll coater, and patterns and marks were printed at equal pitches on the surface by gravure printing. Then, the painted sheet is placed between the feeding roller and take-up roller of the painting device related to Kanemoto Kabutomei, wound up by 1 pitch, and painted using the same hand and face as described above.

In this way, the surface has a decorative layer, the middle layer has a magnetic shielding effect, and the back side is made of ABS.
A strong product was obtained from the resin.

As the illustrated sheet of the example, a transfer film was used in which a 50 μm vinyl chloride film was printed with a rubber brusher and a vinyl chloride ink, and then coated with an acrylic heat seal resin.

Such a transfer film is subjected to the above-described preforming, and then injection molding is performed. In this way, a product was obtained in which the ink of the illustrated sheet was accurately transferred to its surface.

As explained above, according to the present invention, a pattern is printed at a predetermined pitch on a 1ηj standard mold such as a female mold of a vertical injection molding machine, and the patterned sheet is supplied for each lap pitch, and the patterned sheet is heated and softened. , the softened painted sheet) k is vacuum preformed into a fixed mold, and in this state, the mold is narrowed and injection molded, so even if the decorated sheet is rolled during preforming, it can be accurately preformed, and injection molded butter can be It is possible to precisely synchronize the pattern with the 4ζ ship sheet. In addition, since it is applied to a vertical injection molding machine, it is possible to decorate even if the surface area of the decorative sheet is large and heavy, and marks can still be displayed on the decorative sheet by foot pitches, and these marks can be detected by a detector. If the painted sheet is stopped at a predetermined position, the painting can be done continuously using the umezukuri car, and the blowing can be done using the vacuum vent formed in the fixed mold. By doing so, many effects can be achieved, including the ability to accurately paint even deep-drawn molded products.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway sectional view of the painting device according to the present invention, and FIG.
The figure is a TI-II line sectional view of FIG. 1, and FIG. 3 is a perspective view of a molded product molded by the decorating apparatus of the present invention. 2...Fixed type, 3...Vent hole, 10...Movable type,
11... Molten resin injection hole, 14... Painted sheet,
15...Feeding roller, 16...Volume 1'l'i reroller, 2]...Mark displayed on the illustrated sheet, 22
...Detector, 27...Heating device. Applicant's agent Inomata Kiyoshi Proceeding Amendment May 1980 Commissioner of the Japan Patent Office Kazuo Wakasugi 1 Display of the case 1981 Patent application No. 78591 2 Name of the invention Vertical injection molding method and vertical injection molding Benefit device 3 Relationship with the case of the person making the amendment Patent applicant (289) Dai Nippon Printing Co., Ltd. 4 Agent 7 Subject of amendment. ``Detailed Description of the Invention'' column of Book #llI. 8. "Printing" on page 6, line 19 of the detailed description of the amendment is corrected to "printing (vapor deposition or coating)."

Claims (1)

[Claims] A male mold with an injection hole for molten fat is arranged so as to be movable in the vertical direction relative to a female mold having ventilation holes for vacuuming and blowing painted sheets. After the painted sheet tray is intermittently moved approximately horizontally and the painted sheet is spread at a predetermined position on the omnipotent mold, the painted sheet is heated and softened on the female mold, and the painted sheet is softened in the female mold. is vacuumed and the painted sheet is dazzled on the female molding surface for preforming.
A method of painting by orthopedic injection molding, characterized in that the male mold is then placed over the female mold, and then molten resin is sprouted from the injection hole. a) Form a positioning mark at a predetermined position on the marking sheet, detect this mark with a sensor installed in the marking device, and set the marking sheet so that the pattern is placed at the specified position on the female die. 2. The method for painting a large injection molding according to claim 1, wherein the feeding is controlled. 3. A female mold with ventilation holes for vacuuming and painting sheet blowing, a male mold that can be moved vertically relative to the female mold and has an injection hole for molten resin, and a combination of these female and male molds. In between, there is a painted sheet feeding device which intermittently feeds the painted sheet in a horizontal state, and the above-mentioned painted sheet 7il - between the upper surface of the female mold and a position evacuated from thereto in order to vacuum pre-form it on the female mold and soften it to a solid state. A clay-shaped injection molding device comprising a movable heating device. 4. The frame injection molding f'P/painting apparatus according to claim 3, wherein the straight type is equipped with a vacuum/blow switching valve for blowing from a vent hole. 5. The vertical injection molding decorating apparatus according to claim 3 or 4, wherein the overpainting sheet feeding device comprises a feeding roller and a take-up roller for the painting sheet. 6. Marks are displayed at regular intervals on the illustrated sheet,
A fifth aspect of the present invention is characterized in that a sensor is provided in the painting device and generates a signal for controlling a motor that drives the feeding roller and the winding roller by displaying the mark t@. The vertical injection molding device described in Section 1.