JPH07314B2 - Method for producing molded article having multiple color pattern - Google Patents

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 molded article having a multicolor pattern, and more specifically, various multicolor patterns such as granite on the surface of the molded article. The present invention relates to a method for producing a molded product having a multi-colored pattern with increased added value.

[0002]

2. Description of the Related Art Conventionally, as a method for producing a molded article having a multicolor pattern, for example, as shown in the technical concept disclosed in Japanese Patent Laid-Open No. 3-21362, a spray gun for coating a multicolor pattern, a gel coat having a plurality of colors is used. A colored gel coat layer is provided by mixing the resin just before one injection port provided in the gun head of a spray gun and spraying it on the mold surface of the lower mold, and then a backing layer is laminated on this colored gel coat layer. It is known that a molded product having a granite-like multicolored pattern on its surface is produced by fitting an upper mold to the lower mold.

[0003]

However, in the conventional method for producing a molded article having a multi-color pattern, the colored gel coat resins of a plurality of colors are mixed just before being sprayed from one injection port. From the ejection port of the gun head, a plurality of colored gel coat resins in an integrated state, though not completely mixed, are ejected. As a result, in the colored gel coat layer sprayed on the lower mold, an intermediate color in which a plurality of colored gel coat resins are mixed is generated, which gives a slightly strange feeling compared with natural granite. In addition, the mixed state of the colored gel coat resins of a plurality of colors depends on the viscosity of the gel coat resin due to the temperature change, so that the color tone varies greatly and the reproducibility is poor. Also,
The colored gel coat resin is composed of a main agent composed of an unsaturated polyester resin and a curing agent, and both agents are mixed before being sprayed from an injection port. However, if it takes time from mixing to spraying, the colored gel coat resin starts to cure in the spray gun, which causes problems such as clogging. Therefore, it is preferable to mix both agents immediately before spraying. Therefore, it is conceivable to install a stirring device with a motor in the gun head of the spray gun and mix both agents immediately before spraying, but the stirring device with a motor adds weight to the spray gun and It is speculated that it is not suitable. The present invention has been made in view of such circumstances, and it is possible to prevent the occurrence of intermediate colors due to the mixing of colored gel coat resins of a plurality of colors, improve the reproducibility, and have a multi-color pattern that can withstand a long molding operation. An object of the present invention is to provide a method for producing a molded article having

[0004]

A method according to the above-mentioned object.
The method for producing a molded article having a multi-colored pattern as described, the lower mold surface, colored gel coat resin of a plurality of colors, the liquid by a spray gun having a plurality of injection ports to spray the colored gel coat resin of each color independently. It is sprayed in the form of drops to provide a colored gel coat layer having a clear multicolored pattern, and then a backing layer made of a backing material is laminated on the colored gel coat layer, and then the upper mold is fitted to the lower mold. It is configured to manufacture a molded product having a multicolored pattern on the surface. Claim 2
The method for producing a molded article having a multi-color pattern according to claim 1, wherein the spray gun is provided with a static mixer for mixing a main agent of each of the colored gel coat resins and a curing agent. It adopts the one that adopted. A method for producing a molded article having a multicolor pattern according to claim 3 is the method for producing a molded article according to claim 1, wherein a transparent gel coat resin is applied to the mold surface of the mold to provide a transparent gel coat layer, The colored gel coat layer is laminated on the transparent gel coat layer.

[0005]

In the method for producing a molded product having a multicolor pattern according to any one of claims 1 to 3, a liquid obtained by separating colored gel coat resins of respective colors from a plurality of injection ports on a mold surface of a lower mold by operating a spray gun. When sprayed in a droplet state, the colored gel coat resins of the respective colors are sprayed onto the mold surface without being mixed with each other, so that it is possible to prevent the generation of an intermediate color due to the mixing of the colored gel coat resins of a plurality of colors, and the color is clear on the mold surface. A colored gel coat layer having a reproducible multicolor pattern is formed. Then, a backing layer made of a backing material is laminated on the colored gel coat layer, and the upper mold is fitted to the lower mold to manufacture a molded product having a multicolor pattern on the surface. In particular,
In the method for producing a molded article having a multi-color pattern according to claim 2, since the main component of the colored gel coat resin and the curing agent are mixed by the static mixer immediately before being sprayed from the injection port, a spray for mixing two liquids. The gun is lightweight and can withstand long-term molding work. In the method for producing a molded article having a multicolor pattern according to a third aspect, a transparent gel coat resin is applied to the mold surface of a molding die to form a transparent gel coat layer, and a molded article is similarly produced. Since the colored gel coat layer can be seen from the surface of the manufactured molded product through the transparent gel coat layer having a predetermined thickness, the multi-color pattern of the molded product becomes a deep pattern.

[0006]

Embodiments of the present invention will now be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a perspective view of a spray gun applied to a method of manufacturing a molded product having a multicolor pattern according to a first embodiment of the present invention, FIG. 2 is a front view of the spray gun, and FIG. FIG. 4 (a) is a side view of the spray gun, FIG. 4 (a) is an enlarged cross-sectional view during molding of the colored gel coat layer of the method for producing a molded product having a multicolor pattern according to the first embodiment of the present invention, and FIG. FIG. 4 (c) is an enlarged cross-sectional view of the backing layer during molding, FIG. 4 (c) is an enlarged cross-sectional view of the molding die during fitting, and FIG. 5 is a partially enlarged plan view of the manufactured molded product. FIG. 6B is an enlarged sectional view of the transparent gel coat layer during molding of the method for producing a molded product having a multicolor pattern according to the second embodiment of the present invention, and FIG. 6B is an enlarged sectional view of the colored gel coat layer during molding. FIG. 7 shows an enlarged cross-sectional view of the molded product.

A method of manufacturing a molded article having a multiple color pattern according to the first embodiment of the present invention will be described. First, the structure of the spray gun 10 used in the first embodiment of the present invention will be described. As shown in FIG. 1, the spray gun 10 is provided with an operation switch 12 on an upper portion of a grip 11, and an intake / exhaust portion 13 for operating air E1 is provided on a lower portion of the grip 11. A horizontally long L-shaped steel connecting member 14 is provided on the grip 11, and three gun heads 15 (15a, 15b, 15c) are attached to the connecting member 14 side by side. Each of the gun heads 15 is provided with three nozzles 17 having material injection ports 16 opened at the tip thereof, and at the bottom of each gun head 15, mixing of two liquids is possible without using a stirring device having a motor. A static mixer (static mixer) 18 and an air tube 19 capable of performing the above are vertically laid one by one. Further, three joint blocks 20 (20a, 20b, 20c) are provided at the lower ends of the static mixer 18 and the air tube 19 of each gun head 15.
Are connected.

As shown in FIGS. 2 and 3, in each joint block 20, a material supply passage 21 communicating with the static mixer 18 and an L-shaped bend communicating with the air tube 18 for feeding the air E2 are bent. Air supply path 22
And are arranged on the left and right. In addition, in the front part of each joint block 20, a main agent A (A1, A2,
A main agent passage 23 for supplying A3) and a curing agent passage 24 for supplying a curing agent B are arranged vertically. The main agent A1 of the joint block 20a is a white colored gel coat resin, the main agent A2 of the joint block 20b is a gray colored gel coat resin, and the main agent A3 of the joint block 20c is a black colored gel coat resin. Each main agent passage 23 is controlled by a relatively low pressure pump 25.
Is supplied to. The main agents A1 to A3 are mixed with a curing agent B, respectively, and colored gel coat resins A1 ', A2',
A3 '. Further, as shown in FIG. 3, a pilot cylinder 26 is provided at the rear portion of each joint block 20 on the main agent passage 23 side. Hereinafter, the pilot cylinder 26 will be described in detail with reference to FIG.

An air chamber 2 is provided at the rear of the joint block 20.
7 is formed, and a piston case 28 is provided so as to cover the opening on the outside of the air chamber 27. In the piston case 28, the main agent passage 23 is constantly provided by the spring 29.
The piston 30 biased to the side is housed via an O-ring 31. Further, the air chamber 2 is formed on the inner surface of the piston 30.
A long rod 32 is provided which passes through 7 and extends toward the main agent passage 23. A valve 33 that opens and closes the discharge side opening of the main agent passage 23 is provided at the tip of the rod 32.
A pair of packings 34 for filling a gap with the rod 32 are provided in the opening on the side of the material supply passage 21. Further, an inflow hole 35 for the air E1 supplied from the grip 11 side is bored in the lower portion of the joint block 20 in a state of communicating with the air chamber 27. When the operation switch 12 is pressed, the air E1 from the grip 11 side is pressure-fed into the air chamber 27 from the inflow hole 35, and resists the spring force of the spring 29 to cause the piston 30.
Is pushed into the piston case 28, whereby the rod 32 is pulled in the direction of the arrow in the figure, and the main agent passage 23 and the material supply passage 21 are communicated with each other. Next, also with reference to FIG. 3, the inflow path through which the curing agent B flows into each curing agent passage 24 will be described in detail.

As shown in FIG. 3, a normally closed check valve 36 is provided at the opening on the downstream side of the hardener passage 24, and a flow passage for supplying air E1 from the intake / exhaust portion 13 to the pilot cylinder 26. A pressure switch 37 is provided in the middle of the system. When the air E1 flows through this flow path system and the pressure switch 37 receives an input, the pump 38 operates and the hardening agent B is supplied to the hardening agent path 24 of each joint block 20,
It flows into the material supply passage 21 through the check valve 36 opened by the flow pressure of the curing agent B. As shown in FIG. 1, each air supply path 22 is connected to an external blower device 39 that constantly supplies air, and the air E2 is supplied from the pneumatic device 39 to the inside of the air supply path 22 of each joint block 20. Is supplied to. The blower device 39 also serves as a blower device that supplies the air E1 to the intake / exhaust portion 13 of the grip 11.

Next, as shown in FIG. 3, an inflow portion 40 of the cleaning agent C connected to the material supply passage 21 is provided at the lower portion of each joint block 20 in a protruding manner. After completion of the spraying work, a cleaning system for supplying the cleaning agent C to the inflow section 40 is connected, and the cleaning agent C is supplied into the inflow section 40 by the pump 41, so that the inflow section 4 is supplied by the flow pressure of the supplied cleaning agent C.
The normally closed check valve 42 provided in 0 is opened, and the cleaning agent C is pressure-fed to the material supply passage 21, the internal flow passage of the static mixer 18, and the flow passages inside the gun head 15 and the nozzle portion 17, and these The channel and the injection port 16 are cleaned.

Next, the operation of the spray gun 10 will be described. As shown in FIG. 3, when the grip 11 is gripped and the operation switch 12 is pressed, the main flow of the air E1 from the intake / exhaust portion 13 is discharged from the inflow holes 35 of the pilot cylinders 26 provided in the respective joint blocks 20. It flows into the chamber 27 and resists the spring force of the spring 29, and the piston 31
Is pushed backward, the rod 32 retracts, and the valve 33 that closes the main agent passage 23 opens. As a result, the main agent A supplied into the main agent passage 23 by the respective pumps 25 flows into the material supply passage 21 (see FIG. 2). On the other hand, the intake / exhaust unit 1
Part of the air E1 exhausted from No. 3 inputs the pressure switch 37 to operate the pump 38, and the hardening agent B flows into the hardening agent passage 24 of each joint block 20,
The check valve 36 is opened, and the check valve 36 also flows into the material supply passage 21.

In the material supply path 21 of each joint block 20, the main agent A and the curing agent B are mixed, and after that, they flow into the static mixer 18 and pass through this mixer 18, whereby both agents A and B are mixed. Are completely mixed into colored gel coat resins A1 'to A3', which flow into the flow path in the gun head 15. At this time, the air E2 from the blower device 39 is supplied to the flow path provided with the needle valve in the gun head 15 via the air supply path 22 and the air tube 18, and the colored gel coat atomized by the air E2. The resin A1 'passes through the flow path in the nozzle portion 17 and is jetted individually from each jet port 16 in a droplet state without being mixed with each other. That is, FIG.
As shown in FIG. 3, the white colored gel coat resin A1 'is jetted from the jet head 16 on the gun head 15a side, the gray colored gel coat resin A2' is jetted from the jet head 16 on the gun head 15b side, and the jet head on the gun head 15c side. Black colored gel coat resin A3 'is jetted from 16. Thus, the main agent A and the curing agent B are the static mixer 18
The mixture is mixed into the gun head 15 and flows into the gun head 15 where it is immediately injected from the injection port 16 by the high-pressure air supplied from the air tube 18. Therefore, the main agent A and the curing agent B are stored in a container in advance in a mixed state. However, compared to the one that takes a relatively long time from mixing to spraying, the time from mixing to spraying becomes shorter, and the spray gun 1 for curing
The clogging within 0 is unlikely to occur.

Next, at the time of cleaning the spray gun 10, as shown in FIG. 3, an external cleaning system is connected to the inflow portion 40 of each joint block 20, and the cleaning agent C is supplied to the inflow portion 40 by the pump 41. When supplied, the check valve 42 in the inflow portion 40 opens due to the flow pressure of the cleaning agent C, and the cleaning agent C
Flows into the material supply path 21 to clean the main agent flow path system of the spray gun 10. In this way, the range in which the main agent A and the curing agent B in the mixed state flow is a range in which the volume from the static mixer 18 to the injection port 16 of the gun head 15 is relatively small, and therefore the cleaning work after use becomes easy. . The spray gun 10 includes an upper mold 43 and a lower mold 43 as shown in FIG.
It is used in the molding process of a molded product 45 molded by 44. Next, a method of manufacturing a molded article having a multiple color pattern according to the first embodiment of the present invention using the spray gun 10 will be described.

As shown in FIG. 4A, the spray gun 1
When the operation switch 12 is pushed with 0 directed downward, the injection port 16 of each nozzle portion 17 of the gun heads 15a, 15b, 15c
The white colored gel coat resin A1 ′, the gray colored gel coat resin A2 ′, and the black colored gel coat resin A3 ′ are in the form of droplets that do not mix with each other.
Is sprayed on the mold surface. As a result, the colored gel coat layer 46 having a granite pattern, which is an example of a multicolor pattern having clear colors, is provided. By adjusting the needle valve in the gun head 15, the spray gun 10 can selectively spray from the mist-like colored gel coat resins A1 'to A3' in the form of droplets having large particles such as granite. Therefore, not only the pattern of large grains but also the pattern of small grains can be formed in the colored gel coat layer 46. Next, as shown in FIG. 4B, a backing material is applied on the colored gel coat layer 46 to laminate a backing layer 47 having a predetermined thickness. As the lining material of this embodiment, an unsaturated polyester resin as a binder to which a filler made of stone powder and aluminum hydroxide powder is added is used. However, without being limited to this, for example, FRP or the like may be used. Other backing materials may be used. Next, as shown in FIG. 4C, the upper mold 44 is fitted to the lower mold 43 to mold a molded product 45, and then this is removed from the molding mold. As shown in FIG. 5, on the surface of the molded article 45 thus manufactured, white,
A granite pattern with clear gray and black colors appears.

In this way, when the colored gel coat resins A1 'to A3' of three colors are sprayed from the three spray ports 17 on the mold surface of the lower mold 43 in the form of separate droplets, each color. Colored gel coat resin A1 '
Since A3 'is sprayed without being mixed with each other, in the case of the conventional means, it is difficult to form the same pattern because the intermediate color is generated due to the mixing before the injection from the injection port and the pattern is blurred. Generation of an intermediate color due to mixing of colored gel coat resins of a plurality of colors is eliminated, and a colored gel coat layer 46 having a clear and reproducible granite pattern as shown in FIG. 5 is formed on this mold surface. Further, since the static mixer 18 is adopted as a mixing means of the main agent A and the curing agent B of the spray gun 10, it is much lighter than, for example, a stirrer with a motor is attached to the gun head, and can withstand a long molding operation. It becomes a spray gun.

Next, with reference to FIGS. 6 and 7, a method of manufacturing a molded article having a multiple color pattern according to the second embodiment of the present invention will be described. As shown in FIG. 6 (a), the method for producing a molded product having a multicolor pattern of the second embodiment provides a transparent gel coat layer 50 by applying a transparent gel coat resin on the mold surface of the mold,
Then, as shown in FIG. 6B, after the transparent gel coat layer 50 is dried, the colored gel coat resins A1 ′ to A3 ′ of three colors are sprayed by using the spray gun 10 so that the transparent gel coat layer 50 is similarly coated. Then, the colored gel coat layer 46 is laminated onto the colored gel coat layer 46, and then the backing layer 47 is laminated onto the colored gel coat layer 46 as in the case of the first embodiment, and then the upper and lower molds 43 and 44 are fitted to each other. 51 is manufactured. Since the colored gel coat layer 46 having a clear color can be seen from the surface of the produced molded product 51 through the transparent gel coat layer 50 having a predetermined thickness, the pattern of the molded product 51 is just as if the product is seen through the thick transparent glass. It becomes a deep granite pattern.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and the invention is included in the present invention even if there are design changes and the like without departing from the scope of the invention. For example, in the embodiment, as the spray gun, the one in which the static mixer is adopted as the mixing means of the main agent and the curing agent is shown, but the invention is not limited to this. , Any other type of spray gun may be used.

[0019]

In the method for producing a molded article having a multicolor pattern according to claims 1 to 3, when the colored gel coat layer is formed in this manner, the colored gel coat resins of respective colors are not mixed with each other to form a layer. As it is molded, it prevents the generation of intermediate colors due to the mixing of colored gel coat resins of multiple colors,
On the surface of the produced molded product, a colored gel coat layer having a clear and reproducible multicolor pattern is formed. Particularly, in the method for producing a molded product having a multicolor pattern according to claim 2, since the static mixer is adopted as a mixing means of the main agent and the curing agent of the spray gun, the spray gun becomes lightweight and the molding operation for a long time is performed. Can withstand. Further, in the method for producing a molded article having a multicolor pattern according to claim 3,
Since a molded product is manufactured in the same manner after the transparent gel coat layer is provided on the mold surface of the molding mold, from the surface of the manufactured molded product,
The colored gel coat layer can be seen through the transparent gel coat layer having a predetermined thickness, whereby a deep multicolor pattern can be provided on the surface of the molded product.

[Brief description of drawings]

FIG. 1 is a perspective view of a spray gun applied to a method of manufacturing a molded product having a multicolor pattern according to a first embodiment of the present invention.

FIG. 2 is a front view of the spray gun.

FIG. 3 is a side view of the spray gun.

FIG. 4A is an enlarged cross-sectional view of the colored gel coat layer during molding in the method for producing a molded product having a multiple color pattern according to the first embodiment of the present invention. (B) An enlarged sectional view of the backing layer during molding. (C) An enlarged cross-sectional view of the same mold during fitting.

FIG. 5 is a partially enlarged plan view of the manufactured molded article.

FIG. 6A is an enlarged cross-sectional view of the transparent gel coat layer during molding in the method for producing a molded product having a multicolor pattern according to the second embodiment of the present invention. (B) An enlarged sectional view of the colored gel coat layer during molding.

FIG. 7 is an enlarged cross-sectional view of the molded product.

[Explanation of symbols]

 10 spray gun 11 grip 12 operation switch 13 intake / exhaust part 14 connecting member 15 gun head 15a gun head 15b gun head 15c gun head 16 injection port 17 nozzle part 18 static mixer 19 air tube 20 joint block 20a joint block 20b joint block 20c joint block 21 material supply Channel 22 Air supply channel 23 Main agent channel 24 Curing agent channel 25 Pump 26 Pilot cylinder 27 Air chamber 28 Piston case 29 Spring 30 Piston 31 O-ring 32 Rod 33 Valve 34 Packing 35 Inflow hole 36 Check valve 37 Pressure switch 38 Pump 39 Blower device 40 Inflow part 41 Pump 42 Check valve 43 Lower mold 44 Upper mold 45 Molded product 46 Colored gel coat resin 4 Backing layer 50 transparent gelcoat layer 51 moldings

Claims (3)

[Claims] 1. A clear color is obtained by spraying a plurality of colored gel coat resins onto a lower mold surface in a droplet state by a spray gun having a plurality of injection ports for individually spraying each colored gel coat resin. A colored gel coat layer having a multicolor pattern is formed, and then a backing layer made of a backing material is laminated on the colored gel coat layer, and subsequently, an upper mold is fitted to the lower mold to form a molded product having a multicolor pattern on the surface. A method for producing a molded article having a multicolor pattern, the method comprising: 2. The molding having a multi-color pattern according to claim 1, wherein the spray gun is provided with a static mixer for mixing a main agent of each of the colored gel coat resins and a curing agent. Method of manufacturing things. 3. The multiplex according to claim 1, wherein a transparent gel coat resin is applied to the mold surface of the mold to provide a transparent gel coat layer, and then the colored gel coat layer is laminated on the transparent gel coat layer. A method for producing a molded product having a color pattern.