JPH0557744A - Manufacture of molded product with coating - Google Patents

Abstract

PURPOSE:To provide a molded product with coating wherein not only the outer surface but also end surface thereof are coated with a film excellent in decorative properties. CONSTITUTION:An ABS resin sheet 3 is supplied to a female mold 11 along the inner surface thereof so as to reach the end surface forming part thereof and, after a mold 1 is closed in this state, an ABS resin is injected in a cavity 13 to produce a molded product wherein not only the outer surface but also end surface thereof are coated with the ABS resin sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a coated molded article having a coating on the outer surface and the end surface, and more specifically, a vehicle body such as an automobile / motorcycle, a housing for OA equipment / home appliances, a stationery. The present invention relates to a method for producing a coated molded article in which not only the outer surface but also the end surface of such a molded article is coated with a coating excellent in surface hardness, weather resistance and soft touch.

[0002]

2. Description of the Related Art In recent years, as a method for increasing the added value of plastic molded products such as daily necessities and automobile interiors, a method of transferring a pattern printed on a sheet to the surface of the molded product at the same time as injection molding and various characteristics have been developed. For example, a method of attaching the provided thermoplastic resin sheet is performed. As a concrete example,
For example, as described in Japanese Patent Application Laid-Open No. 63-178015, after the wood grain printed material is loaded into the mold and the mold is closed,
There has been proposed a method for producing a wood grain resin molded product by injection molding a resin material.

[0003]

Problems to be Solved by the Invention JP-A-63-1780
According to the method disclosed in Japanese Patent No. 15, the surface of the molded wood grain resin molded product is decorated with a wood grain tone, but the end faces are not decorated with a wood grain tone, and the appearance of the molded product is Poorly, there is a problem that the added value of the molded product is low and it cannot be adopted as a product, particularly when manufacturing a vehicle part or a container in which the end surface of the molded product is easily visible. .. (1) The present invention has been made for the purpose of providing a coated molded article which is coated not only on the outer surface of the molded article but also on the end surface, and which is coated with a coating excellent in surface hardness, weather resistance and soft touch. is there.

[0004]

In the method for manufacturing a coated molded article according to the present invention, a cavity having an inner surface shape corresponding to the outer surface shape of the molded article to be molded is provided between the female mold and the male mold. In a method for producing a coated molded product by supplying a coating sheet and a resin for molding a main body into a mold, a female mold or a male mold is provided with an outer surface forming part and an end face forming part of the molded product to be molded. In this method, the main body is molded with the molding resin in a state where the coating sheet is provided along the outer surface forming portion and the end surface forming portion. In the present invention, as the sheet,
At least it is preferable to be composed of a film having a malleability under heating, for example, a thermoplastic resin sheet, a thermosetting resin sheet, a photocurable resin sheet, an electron beam curable resin sheet, thermosetting A resin sheet, a photocurable resin sheet, an electron beam curable resin sheet, a laminated sheet in which a colored resin layer containing a high pigment is laminated, or a thermoplastic resin sheet other than the above thermoplastic resin sheet. Laminated laminated sheets, laminated sheets obtained by printing the surfaces or interfaces (between laminated sheets) of these sheets, and the like are used.

Examples of the thermoplastic resin sheet include:
Polystyrene, acrylic polymer, polycarbonate, polyvinyl chloride, polyethylene, polypropylene,
Acrylonitrile-butadiene-styrene copolymer (A
BS), modified polyphenylene oxide, polyphenylene sulfide, polyether imide, polyether ether ketone, ionomer and the like as a main component are used.

As the thermosetting resin sheet, for example,
An uncured or semi-cured sheet mainly composed of a reactive acrylic resin such as an acrylic polyol and a blocked isocyanate, a reactive vinyl monomer and / or an oligomer, a thermoplastic resin and / or a resin having a vinyl group, and a peroxide An uncured or semi-cured sheet or the like containing a material as a main component is used.

The photocurable resin sheet is, for example,
An uncured or semi-cured sheet containing a thermoplastic resin, a monomer having a double bond such as a vinyl group, and a photoinitiator as main components is used.

As the electron beam curable resin sheet, for example, an uncured or semi-cured sheet containing a thermoplastic resin and a monomer having a double bond such as a vinyl group as a main component is used.

As the molding resin used in the present invention, a thermoplastic resin for the synthetic resin sheet, an unsaturated polyester resin, an acrylic resin, an epoxy resin, or a filler such as glass fiber is added to these resins. The thing etc. are mentioned.

The manufacturing method of the coated molded article of the present invention is not limited to injection molding method, stamping molding method, sheet mold compound (SMC) press molding method and the like, as long as it is a method of supplying a resin to a mold and molding. Such a method may be used. The material of the mold used here, the position of the injection molding gate, and the like may be known materials or methods.

Normally, a female mold is provided with an outer surface forming portion and an end surface forming portion of a molded product to be molded, but in some cases, the male mold (along with the female mold if necessary) is formed with the outer surface forming portion and the end surface forming portion. May be provided.

[0012]

In the present invention, the outer surface forming portion and the side end surface forming portion of the molded product to be molded are provided on the inner surface of the female mold or the male mold, and the sheet is placed along the outer surface forming portion and the side end surface forming portion. Since the main body is molded with resin for main body molding in this state,
It is possible to easily manufacture a coated molded product having a good appearance in which the molding resin body is not visible even when the end face of the coated molded product is seen as shown by the arrow in FIG. Auto parts such as bumpers and door mirrors that could not be used, containers such as trash cans and containers, laptop computers, portable radio cassette recorders, portable CD players, etc.
A. It has become possible to provide coated molded products that can be applied to housings of home appliances.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments of the drawings. First, an example of a mold used in the present invention is shown in FIG.
Will be described.

Reference numeral 1 denotes an injection molding die used in the present invention, which comprises a moving side female die 11 and a fixed side male die 12,
Between the female mold 11 and the male mold 12, there is provided a cavity 13 having an inner surface shape corresponding to the outer surface shape of the molded product 2 to be molded having a box shape having a substantially U-shaped cross section.

That is, the female die 11 is provided with a concave outer surface forming portion 111 which forms the outer surface of the molded product to be molded, and the male die 12 is convex which forms the inner surface of the box-shaped molded product. A shaped inner surface molding portion 121 is provided.

On the four side surfaces of the female die 11 on the male die 12 side, slide portions 112 are provided by a cylinder 113 so as to be movable back and forth along the parting line with respect to the cavity 13. The tip surface of the slide portion 112 is an inclined surface that narrows in the opening direction of the cavity 13,
It is an end face forming portion 112a that forms an inclined end face of the molded product.

When the mold 1 is closed, the outer surface forming part 111 of the female mold 11 and the cylinder 113 are extended and advanced, and the end face forming part 1 of the tip end surface of the slide part 112 is advanced.
A portion surrounded by 12a and the projecting inner surface forming portion 121 of the male die 12 is a cavity 13 for molding a molded product.

The outer surface forming portion 111 of the female die 11 is provided with a large number of extremely small vent holes 114.
Suction and compressed air are made possible through 14. Female mold 11 and male mold 12 when mold 1 is open
As shown in FIG. 3, a heating platen 4 is provided between and, so that the heating platen 4 can move back and forth. The heating plate 4 has a large number of very small ventilation holes 4
1 is provided, and suction and compressed air are possible through the vent hole 41.

Next, an embodiment of the present invention will be described with reference to FIGS. First, as shown in FIG. 2, the cylinder 113 is extended and the slide portion 112 is moved forward.

Next, as shown in FIG. 3, the sheet 3 is supplied together with the heating plate 4 in a state in which the sheet 3 is suction-fixed to the heating plate 4 through the ventilation holes 41 on the side surface where the outer surface forming portion 111 of the female die 11 is opened, The sheet 3 is heated by the heating platen 4, vacuum suction is performed through the ventilation holes 114 of the outer surface forming unit 111, and air is compressed through the ventilation holes 41 of the heating platen 4 to move the sheet 3 to the outer surface forming unit 111 and the end surface forming unit 112a. Make them adhere closely.

Furthermore, as shown in FIG. 4, when the heating plate 4 is removed and the mold 1 is closed, the inner surface forming portion 121 of the male mold 12 is closed.
In order to prevent the inconvenience of rubbing the sheet 3 on the slide portion 112 or hindering the mold closing, the cylinder 113 is once contracted and the slide portion 112 is retracted along the parting line.

After that, the mold 1 is closed, the cylinder 113 is extended again, and the slide portion 112 is advanced along the parting line. If the above-described inconvenience does not occur when closing the mold 1, the mold 1 may not necessarily be closed without retracting the slide portion 112 as described above.

Thus, in the mold 1, the outer surface forming portion 1
11 and the sheet 3 for covering the end surface forming portion 112a are brought into close contact with each other, and the outer surface forming portion 111 and the cylinder 113 of the female die 11 are extended and moved forward.
A closed cavity 13 surrounded by the end face forming portion 112 a of the tip end surface of the male mold 12 and the projecting inner surface forming portion 121 of the male die 12 is formed.

In the cavity 13, the sprue 12 is filled with molten main body molding resin for main body molding by an injection molding machine.
Injection molding from 2. Then, after a predetermined time has passed, the mold 1
After cooling inside, the cylinder 113 is contracted to retract the slide portion 112, the mold 1 is opened, the molded product is taken out, and the sheet protruding from the end face of the molded product is cut, as shown in FIG. A box-shaped coated molded product 2 in which not only the outer surface of the molded product main body 21 but also the end surface is coated with the coating film 22 is obtained.

After closing the mold 1, the slide portion 11
The molten molding resin for molding the main body is injected into the cavity 13 without moving the molding resin 2 forward, and the cylinder 113 is extended to slide the slide portion 112 while the molding resin is uncured.
Is moved forward, and the end face forming portion 112a is pressed while the sheet 3 is covered on the end face to partially close the mold, thereby forming the end face covered with the sheet 3 of the molded product. You can

Further, in the above embodiment, the case where the box-shaped coated molded product is manufactured has been described, but the present invention is not limited to the case where the box-shaped coated molded product is manufactured. For example,
Even in the case of producing a long gutter-shaped coated molded product, not only the side end faces along the longitudinal direction but also the end face forming portions 112a similar to the above are provided on both end faces located at both end portions. By providing 112 and the cylinder 13, it is possible to obtain a coated molded product in which not only the outer surface of the long gutter-shaped molded product but also the side end faces and both end faces thereof are coated with the synthetic resin sheet.

Example 1 A coated molded article was molded under the following conditions according to the above steps shown in FIGS.

As the sheet, a sheet made of acrylonitrile-butadiene-styrene copolymer (ABS) having a film thickness of 500 μm prepared by calendering is used, the temperature of the heating platen 4 is set to 160 ° C., and the ventilation hole 114 of the female die 11 is used. Vacuum suction and 4 kg / cm from vent 41 of heating plate 4
^It was air-pressurized at ^{2 and} was fitted along the outer surface forming portion 111 of the female die 11 and the end face forming portion 112a and its periphery.

After the mold 1 was closed, ABS (manufactured by Denki Kagaku Kogyo Co., Ltd .: trade name "ABS-ME") was melted in a cavity 13 in which the temperature of the female mold 11 was 60 ° C. by an injection molding machine not shown. The resin for molding the main body was injected.

As a result, it was possible to obtain a coated molded product 2 in which the outer surface and the end surface of the ABS molded product main body 21 were coated with the coating 22 of the ABS sheet. The appearance of the end surface of the coated molded product 2 was good.

Example 2 A sheet having a film thickness of 250 formed by calender molding
Using a polypropylene (PP) sheet of μm, it is heated at a temperature of 165 ° C. on a heating plate 5 and P is used as a resin for molding the main body.
Using P (manufactured by Mitsubishi Petrochemical: product name "BC3"), female mold 1
A coated molded article was molded in the same manner as in Example 1 except that the temperature of 1 was 40 ° C.

As a result, it was possible to obtain the coated molded product 2 in which the outer surface and the end surface of the molded product main body 21 made of PP were covered with the coating 22 made of the PP sheet. The appearance of the end surface of the coated molded product 2 was good.

Example 3 As a sheet, a sheet of a photocurable resin having a thickness of 100 μm [300 parts by weight of ethyl acetate, 100 parts of an acrylic resin (manufactured by Kyowa Gas Chemical Co., Ltd .: trade name “Parapet beads”) is used.
50 parts by weight, acrylate monomer (manufactured by Nippon Kayaku Co., Ltd .: trade name "KAYARADDPCA-20"), 4 parts by weight of 2,4,6-trimethylbenzoyldiphenylphosphine oxide as a photopolymerization initiator, N-methyldie. A curable resin composition obtained by mixing 2 parts by weight of linoleamine was applied to the release surface of a polyethylene phthalate (PET) film, dried at 80 ° C. for 5 minutes, and then P
An uncured product obtained by peeling the ET film] was used, the temperature of the heating platen 4 was set to 60 ° C., and the photocurable resin was irradiated with ultraviolet rays by a high pressure mercury lamp after injection molding. A coated molded product was molded in the same manner as in Example 1.

As a result, it was possible to obtain a coated molded article 2 in which the outer surface and the end surface of the molded article body 21 made of ABS were coated with the coating 22 made of a cured sheet of a photocurable resin. The appearance of the end surface of the coated molded product 2 was good.

Example 4 As a sheet, an electron beam-curable resin sheet (300 parts by weight of ethyl acetate, acrylate monomer (manufactured by Nippon Kayaku Co., Ltd .: trade name "KAYARAD DPCA-20") 50
A curable resin composition obtained by mixing 30 parts by weight of a red pigment (manufactured by Japan Ciba-Geigy Co., Ltd .: trade name "Chromophtal red A2B") is applied to the release surface of a PET film at 80 ° C. Uncured product obtained by peeling the PET film after drying for 5 minutes]
Example 1 except that the temperature of the heating platen 5 was set to 60 ° C. and the electron beam curable resin was cured after injection molding.
A coated molded product was molded in the same manner as in.

As a result, it was possible to obtain the coated molded product 2 in which the outer surface and the end face of the molded product main body 21 made of ABS were coated with the coating 22 of the cured sheet of the electron beam curable resin. The appearance of the end surface of the coated molded product 2 was good.

Example 5 As a sheet, a 350 μm suede-like sheet [urethane resin (manufactured by Nippon Polyurethane Industry Co., Ltd .: trade name "Nipporan 5120") (solid content 30%), 100 parts by weight in solid content, elastic beads (Nippon Catalyst) Chemical Industry Co., Ltd .: trade name "Elastostatic beads EBS100" 100 parts by weight of elastic beads of acrylic-urethane resin, average particle size 10 μm) were mixed and calendered to form a 250 μm thick PP sheet with chlorinated PP in advance. It is coated on a primer-coated sheet so that the film thickness after drying will be 100 μm, and 80 ° C.
Obtained by drying for 30 minutes.], The temperature of the heating platen 4 was set to 165 ° C., and PP (manufactured by Mitsubishi Petrochemical Co., Ltd .: trade name “BC3”) was used as the resin for molding the main body. That is, the coated molded product was molded in the same manner as in Example 1 except that the temperature of the female mold 11 was set to 40 ° C.

As a result, it was possible to obtain the coated molded product 2 in which the outer surface and the end face of the molded product main body 21 made of PP were coated with the coating 22 made of a suede-like sheet. The appearance of the end surface of the coated molded product 2 was good.

Example 6 A sheet having a thickness of 25 prepared by calender molding
A 0 μm PP sheet was coated with a chlorinated polypropylene (chlorinated PP) based primer, and a high pigment coloring layer obtained by mixing 100 parts by weight of acrylic polyol with 100 parts by weight of rutile type titanium oxide was coated to a thickness of 60 μm. In addition, a coating sheet obtained by thermally laminating the photocurable sheet used in Example 3 above was used, and the temperature of the heating platen 4 was set to 17
0 ° C., PP (manufactured by Mitsubishi Petrochemical Co., Ltd .: trade name “BC3”) was used as a resin for molding the main body, the temperature of the female mold 11 was 40 ° C., a photocurable resin after injection molding Example 1 except that the sample was irradiated with ultraviolet rays from a high pressure mercury lamp.
A coated molded product was molded in the same manner as in.

As a result, it was possible to obtain the coated molded product 2 in which the outer surface and the end face of the molded product main body 21 made of PP were coated with the coating 22 of the high pigment coloring sheet. The appearance of the end surface of the coated molded product 2 was good.

Comparative Example 1 A coated molded article was molded in the same manner as in Example 1 except that the cylinder 142 was contracted and the slide portion 112 was retracted along the parting line throughout the entire process.

As a result, as shown in FIG. 6, a coated molded product 2'having an outer surface of the molded product main body 21 'made of ABS coated with a film 22' made of an ABS sheet could be obtained. However, the end surface of the coated molded product 2'was not covered with the ABS sheet, and its appearance was poor.

Comparative Example 2 Throughout the entire process, the cylinder 142 was contracted and the slide portion 112 was retracted along the parting line, and as a sheet, polypropylene (PP) having a film thickness of 250 μm prepared by calender molding. Coating was performed in the same manner as in Example 1 except that the sheet was used, PP (manufactured by Mitsubishi Petrochemical Co., Ltd .: trade name "BC3") was used as the main body molding resin, and the temperature of the female mold 11 was 40 ° C. A molded product was molded.

As a result, as shown in FIG. 6, a film 22 'made of a PP sheet is formed on the surface of the molded article body 21' made of PP.
It was possible to obtain a coated molded product 2'coated with. However, the end face of the coated molded product 2'was not covered with the PP sheet, and its appearance was poor.

[0045]

[Effect] In the present invention, because of the constitution as described above, not only the outer surface of the molded product but also the end surface is coated with a coating, and the appearance is such that the molding resin body cannot be seen from the end surface. A good coated molded product can be easily manufactured, and it can be applied to automobile parts, containers, housings for OA / home electric appliances, etc. that could not be used until now due to the poor appearance of the end surface of the coated molded product. It has become possible to provide various coated molded products.

[Brief description of drawings]

FIG. 1 is a vertical sectional end view showing an example of a mold used in the present invention.

FIG. 2 is a vertical cross-sectional view illustrating an example of the process of the present invention.

FIG. 3 is a vertical cross-sectional view illustrating an example of a process of the present invention.

FIG. 4 is a vertical cross-sectional view illustrating an example of the process of the present invention.

FIG. 5 is a vertical cross-sectional perspective view showing an example of a coated molded article obtained by the present invention.

FIG. 6 is a vertical cross-sectional view of a coated molded product obtained by a conventional method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mold 2 Molded product 3 Sheet 4 Heating plate 11 Female mold 12 Male mold 13 Cavity 21 Molded product body 22 Coating 41 Vent hole 111 Outer surface forming part 112 Sliding part 112a End surface forming part 121 Inner surface forming part 122 Sprue

Front page continuation (51) Int.Cl. ⁵ Identification code Office reference number FI technical display area // B29L 9:00 4F

Claims (1)

[Claims] 1. A coating sheet and a resin for molding a main body are provided in a mold provided with a cavity having an inner surface shape corresponding to an outer surface shape of a molded product to be molded between a female mold and a male mold. In the method of supplying a coated molded product, a female mold or a male mold is provided with an outer surface forming part and an end face forming part of a molded product to be molded, and a sheet for coating the outer surface forming part and the end face forming part. A method for producing a coated molded article, characterized in that the main body is molded with a molding resin in a state of being lined up.