WO2010106968A1

WO2010106968A1 - Die for forming coated article in mold

Info

Publication number: WO2010106968A1
Application number: PCT/JP2010/054178
Authority: WO
Inventors: 弘一浜岡
Original assignee: 日本写真印刷株式会社
Priority date: 2009-03-17
Filing date: 2010-03-12
Publication date: 2010-09-23
Also published as: TW201043438A; JP2010214745A

Abstract

Disclosed is a die for forming a coated article in the mold, wherein seal materials (31, 31A, 32) are arranged on the parting surface (3P) of a back surface forming die (3) that can be clamped to a front surface forming die (1), or on the parting surface (2P) of a film-forming die (2) that can be clamped to the back surface forming die (3) instead of the front surface forming die (1).

Description

In-mold coated product forming mold

The present invention relates to an in-mold in which a thermosetting paint is injected between a surface of a molded product molded in a mold and a mold cavity surface and then cured, and the thermosetting paint is closely integrated with the surface of the molded product. The present invention relates to a coating product forming mold.

As a conventional in-mold coated product forming mold, a technique for forming an in-mold coated product 110 by the following method using a surface forming mold 101, a coating film forming mold 102, and a back surface forming mold 103 is disclosed in Patent Document 1. Is disclosed.

(1) When the molding cavity 104 is formed by the front surface forming mold 101 and the back surface forming mold 103, the molded article 108 is injection-molded by filling the molding cavity 104 with a molding resin (see FIG. 6A).
(2) With the back surface forming mold 103 holding the molded product 108, the mold facing the back surface forming mold 103 is switched from the surface forming mold 101 to the coating film forming mold 102, and the surface of the molded product 108 is switched. A coating cavity 105 is formed by a gap between the coating film forming mold 102 and the coating film forming mold 102 (see FIG. 6B).
(3) A decorating thermosetting paint made of a liquid thermosetting composition is injected into the coating cavity 105, and a thermosetting paint layer 109 is formed on the surface of the molded article 108, so that an in-mold coated article is obtained. 110 is formed (see FIG. 6C).

Japanese Patent No. 3998660

However, unlike the molten resin in normal injection resin molding, the viscosity of the thermosetting paint for decorating is very low at several tens cps. Therefore, the coating material penetrates and cures even in a slight gap on the parting surface between the coating film forming mold 102 and the back surface forming mold 103 that is generated as an error during mold processing or as a mold scratch while using the mold. As a result, there is a problem that burrs are generated on the outer periphery of the in-mold coated product 110.

An object of the present invention is to provide an in-mold coated product forming mold that can prevent burrs from occurring on the outer periphery of the in-mold coated product.

The present invention has the following features in order to achieve the above object.

According to the first aspect of the present invention, a back surface forming mold,
A surface forming mold that is clamped to the back surface forming mold to form a molding cavity capable of forming a molded product with the surface forming mold; and
In place of the front surface forming mold, the back surface forming mold which is clamped with the back surface forming mold and holds the molded product with a coating cavity capable of forming a thermosetting paint layer on the surface of the molded product; A coating film forming mold formed with the coating film forming mold;
There is provided an in-mold coated product forming mold provided with a sealing material disposed on at least one of a parting surface of the back surface forming mold and a parting surface of the coating film forming mold.

According to the second aspect of the present invention, the mold according to the first aspect, wherein the sealing material is disposed at least at a position adjacent to the coating cavity forming portion of the back surface forming mold constituting the coating cavity. Providing molds for interior coating products.

According to the third aspect of the present invention, the sealing material is located at a position not facing the molding cavity and at a position where the parting surface of the back surface forming mold and the parting surface of the coating film forming mold face each other. An in-mold coated product forming mold according to the second aspect is provided.

According to a fourth aspect of the present invention, in-mold coating according to the first aspect, wherein the sealing material is disposed at a position adjacent to a molding cavity forming portion of the back surface forming mold constituting the molding cavity. Provide product forming mold.

According to a fifth aspect of the present invention, in the mold according to the first aspect, the sealing material is disposed at a position adjacent to a coating cavity forming portion of the coating film forming mold constituting the coating cavity. Provide paint forming molds.

The in-mold coated product forming mold of the present invention is applied to the surface forming mold and the back forming mold that can be clamped, or to the back forming mold instead of the surface forming mold. A sealing material is disposed on the parting surface of the film forming mold. Therefore, the sealing material that is crushed when the back surface forming mold and the coating film forming mold are clamped fills a slight gap between the back surface forming mold and the coating film forming mold, and the paint leaks. It can prevent the occurrence of burrs around the coated product in the mold.

These and other objects and features of the invention will become apparent from the following description taken in conjunction with the preferred embodiments with reference to the accompanying drawings. In this drawing,
FIG. 1A is a cross-sectional view showing a process of forming an in-mold coated product with an in-mold coated product forming mold according to an embodiment of the present invention; FIG. 1B is a cross-sectional view showing a process of forming the in-mold coated product with the in-mold coated product forming mold according to the embodiment of the present invention, FIG. 1C is a cross-sectional view showing a process of forming the in-mold coated product with the in-mold coated product forming mold according to the embodiment of the present invention, FIG. 2A is an enlarged partial cross-sectional view of an application portion of the sealing material of the in-mold coated product forming mold according to the embodiment of the present invention, FIG. 2B is an enlarged partial cross-sectional view of an application location of the sealing material of the in-mold coated product forming mold according to the first modification of the embodiment of the present invention, FIG. 3A is an enlarged partial cross-sectional view of an application portion of the sealing material of the in-mold coated product forming mold according to the second modification of the embodiment of the present invention, FIG. 3B is an enlarged partial cross-sectional view of an application location of the sealing material of the in-mold coated product forming mold according to the third modification of the embodiment of the present invention, FIG. 4A is a partial cross-sectional view enlarging an application portion of the sealing material of the in-mold coated product forming mold according to the fourth modified example of the embodiment of the present invention, FIG. 4B is an enlarged partial cross-sectional view of an application location of the sealing material of the in-mold coated product forming mold according to the fifth modification of the embodiment of the present invention, FIG. 5 is a schematic view of a paint injection machine used for the in-mold coated product forming mold according to the embodiment of the present invention, FIG. 6A is a cross-sectional view showing a process of forming an in-mold coated product with a conventional in-mold coated product forming mold, FIG. 6B is a cross-sectional view showing a process of forming an in-mold coated product using the conventional in-mold coated product forming mold, FIG. 6C is a cross-sectional view showing a process of forming an in-mold coated product using the conventional in-mold coated product forming mold.

Before continuing the description of the present invention, the same parts are denoted by the same reference numerals in the accompanying drawings.

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

An in-mold coated product forming mold according to an embodiment of the present invention includes a surface forming mold 1, a coating film forming mold 2, and a back surface forming mold 3, and includes a back surface forming mold 3 and / or a coating film forming. Frame-

shaped sealing materials

31, 31 A, and 32 are arranged on the parting surface of the mold 2 so as to surround at least the coating cavity 13.

The back surface forming mold 3 is used for forming the back surface shape of the molded product 22. For this reason, the back surface forming mold 3 has a molding cavity forming portion 3a for forming the molding cavity 12 on the parting surface 3P. The molding cavity forming part 3a is formed as a convex part as an example in FIG. 1A, but may be a concave part.

The surface forming mold 1 is used to form the surface shape of the molded product 22. For this reason, the surface forming mold 1 has a molding cavity forming portion 1a for forming the molding cavity 12 on the parting surface 1P. The molding cavity forming portion 1a is formed as a concave portion as an example in FIG. 1A, but may be a convex portion. The front surface forming mold 1 is disposed at a position facing the back surface forming mold 3 and is clamped between the front surface forming mold 1 and the back surface forming mold 3 when the back surface forming mold 3 is clamped. The forming cavity 12 can be formed by the forming portion 1a and the forming cavity forming portion 3a.

In order to form the in-mold coated product 23, first, the back surface forming die 3 and the surface forming die 1 are clamped to form the forming cavity forming portion 3a of the back surface forming die 3 and the forming cavity of the surface forming die 1. The molded product 22 is formed by filling the molding cavity 12 formed with the portion 1a with the molding resin from the resin injection machine 40 by using the back surface forming mold 3 or the passage 1h penetrating the surface forming mold 1. It is formed by an injection molding resin process (see FIG. 1A).

The coating film forming mold 2 is a mold that can be clamped with the back surface forming mold 3 instead of the front surface forming mold 1. That is, after forming the molded product 22 between the back surface forming mold 3 and the surface forming mold 1 as described above, it is applied to a position facing the back surface forming mold 3 instead of the surface forming mold 1. After the film forming mold 2 is arranged, the back surface forming mold 3 and the coating film forming mold 2 are clamped. The coating film forming mold 2 has an outer shape larger than that of the molding cavity forming portion 1a of the surface forming mold 1 so that a space portion that does not contact the surface of the molded product 22 can be formed on the surface side of the molded product 22. The coating cavity forming portion 2a is configured. The coating cavity forming portion 2 a that is a non-contacting space portion corresponds to the coating cavity 13. That is, the coating cavity 13 includes the surface of the molded product 22, a part of the parting surface 3 P (the coating cavity forming portion 3 c described later) of the back surface forming mold 3, and the coating cavity forming portion 2 a of the coating film forming mold 2. Formed between. After forming the molded product 22, in a state where the back surface forming mold 3 holds the molded product 22, the mold facing the back surface forming mold 3 is switched from the front surface forming mold 1 to the coating film forming mold 2. A coating cavity 13 is formed on the surface of the product 22 by a gap such as a coating cavity forming portion 2a (see FIG. 1B). Here, in order for the back surface forming mold 3 to hold the molded product 22, for example, the molded product 22 is bitten into an ejector pin (not shown) formed on the back surface forming mold 3 as in general molding. Accordingly, the molded product 22 can be held so as not to be detached from the back surface forming mold 3.

Then, a thermosetting paint for decoration made of a liquid thermosetting composition is injected into the coating cavity 13 from a paint injector 41 described later, and a thermosetting paint layer 21 is formed on the surface of the molded product 22. Thus, the in-mold coated product 23 is formed (see FIG. 1C). Here, a part of the parting surface 3P of the back surface forming mold 3, more specifically, at least at the position of the coating cavity forming portion 3c of the back surface forming mold 3 or at a position adjacent to the coating cavity forming portion 3c. A shaped sealing material 31 is formed. As an example, as shown in FIG. 2A, the sealing material 31 is disposed so as to fit in the frame-shaped recess 3 f of the parting surface 3 P of the back surface forming mold 3, and seals more than the depth of the recess 3 f. The material 31 has a slightly large thickness. Therefore, when the sealing material 31 is attached to the recess 3f, the sealing material 31 slightly protrudes from the recess 3f. Therefore, the sealing material 31 crushed by the parting surface 2P of the coating film forming mold 2 and the molded product 22 when the back surface forming mold 3 and the coating film forming mold 2 are clamped is The slight gap between the coating film forming mold 2 and the small gap between the molded product 22 and the coating film forming mold 2 are filled to prevent the paint from leaking, and the outer periphery of the in-mold coated product 23 Can be prevented. In this case, the sealing material 31 forms an end of the coating cavity 13 on the parting surface 3P side of the back surface forming mold 3.

Since the frame-shaped

sealing materials

31, 31A, 32 are crushed and deformed during mold clamping to seal the gap, the Young's modulus is lower than the mold materials used for the

molds

1, 2, 3. It is important. As such a material, a fluorine compound, a silicon compound, tin, zinc, lead, or the like may be used.

In order to place the sealing

materials

31, 31A, 32 on the parting surfaces 3P, 2P of the back surface forming mold 3 and / or the coating film forming die 2, the sealing

materials

31, 31A, 32 are coated on the

molds

3, 2. Alternatively, after the sealing

materials

31 and 32 are once formed as separate members, the sealing

materials

31, 31 A, and 32 may be attached to the

molds

3 and 2. However, it is necessary to arrange the sealing

materials

31, 31 A, and 32 so that they do not fall off from the

molds

3 and 2 due to repeated opening and closing of the molds by continuous molding.

Further, the sealing

materials

31, 31 A, and 32 should have good releasability from the thermosetting paint for forming the thermosetting paint layer 21 in the coating cavity 13. When the sealing

materials

31, 31A, 32 are fixed to the thermosetting paint, the sealing

materials

31, 31A, 32 are used when the mold is opened or when the in-mold coated product 23 is taken out from the

mold

3, 2. This is because there is a risk of falling off from the

molds

3 and 2, or the in-mold coated product 23 being pulled toward the sealing

material

31, 31A, 32 side and deformed.

Here, a mode in which the sealing material 31 formed on the back surface forming mold 3 is disposed at least on the parting surfaces 3P and 2P adjacent to the coating

cavity forming portions

3c and 2a of the back surface forming mold 3 will be described in detail (FIG. 2A and FIG. 2B).

FIG. 2A and FIG. 2B are partial cross-sectional views in which the application location A (see FIG. 1B) of the sealing material 31 is enlarged. The sealing material 31 may be extended and arranged so as to face the molding cavity 12 and form the outer shape of the molded product 22 on the parting surface 3P of the back surface forming mold 3 (see FIG. 2A). . However, when the sealing material 31 is a soft sealing material, it may be crushed and deformed by the molding resin injected at a high pressure into the molding cavity 12, and as a result, the shape of the molded product 22 may be defective. Therefore, when the sealing material 31 is arranged as shown in FIG. 2A, the material of the sealing material 31 is hard enough to be crushed by the molding resin injected at a high pressure into the molding cavity 12 and does not deform, and has a sealing effect. It is preferable to use a material that can also exhibit the above.

Therefore, as another modification of the above-described embodiment of the present invention, when the frame-shaped sealing material 31A does not face the molding cavity 12 on the parting surface 3P of the back surface forming mold 3, the outer shape of the molded product 22 is obtained. Since the sealing material 31A is not formed, the shape defect of the molded product 22 does not occur, and since the sealing material 31A is not deformed by the thermosetting paint injected at a low pressure because of low viscosity, the thermosetting paint layer No shape defects 21 occur, which is preferable (see FIG. 2B). That is, in FIG. 2B, in the parting surface 3P of the back surface forming mold 3, it is in a position not facing the molding cavity 12 and the coating cavity 13 (position where the back surface forming mold 3 and the coating film forming mold 2 are in direct contact). A frame-shaped recess 3g is provided, and a frame-shaped seal material 31A made of the same material as the seal material 31 is disposed in the recess 3g. As an example, the sealing material 31 A has a thickness that is slightly larger than the depth of the recess 3 g of the parting surface 3 P of the back surface forming mold 3. Therefore, when the sealing material 31A is attached to the recess 3g, the sealing material 31A slightly protrudes from the recess 3g. Therefore, the sealing material 31A crushed by the parting surface 2P of the coating film forming mold 2 when the back surface forming mold 3 and the coating film forming mold 2 are clamped is used as the back surface forming mold 3 and the coating film forming mold. By filling a slight gap between the mold 2 and the paint, it is possible to prevent the paint from leaking and to prevent the occurrence of burrs on the outer periphery of the in-mold coated product 23.

Next, as another modification of the above-described embodiment of the present invention, the sealing material 32 formed on the coating film forming mold 2 has a parting surface 2P adjacent to the coating cavity forming portion 2a of the coating film forming mold 2. The aspect arrange | positioned in FIG. 3 is demonstrated in detail (refer FIG. 3A and 3B).

3A and 3B are partial cross-sectional views in which the application portion A (see FIG. 1B) of the sealing material 32 is enlarged. The sealing material 32 may be disposed only on the coating film forming mold 2 (see FIG. 3A). However, when the sealing material 32 is disposed in combination with the sealing material 31 formed on the back surface forming mold 3, the effect of preventing coating leakage is obtained. It can be expected to be higher (see FIG. 3B).

That is, in FIG. 3A, the parting surface 2P of the coating film forming mold 2 is such that the side surface faces the coating cavity 13 (the position where the back surface forming mold 3 and the coating film forming mold 2 are in direct contact with each other) A frame-shaped recess 2g is provided at a position facing the cavity 13, and a frame-shaped seal material 32 of the same material as the seal material 31 is disposed in the recess 2g. Similar to the sealing material 31, the sealing material 32 has a thickness slightly larger than the depth of the recess 2g of the parting surface 2P of the coating film forming mold 2 as an example. If comprised in this way, in the state which attached the sealing material 32 to the recessed part 2g, the sealing material 32 will protrude a little from the recessed part 2g. Therefore, the sealing material 32 crushed by the parting surface 3P of the back surface forming die 3 when the back surface forming die 3 and the coating film forming die 2 are clamped is used as the back surface forming die 3 and the coating film forming die. 2 can be filled to prevent the paint from leaking, and the occurrence of burrs on the outer periphery of the in-mold coated product 23 can be prevented.

3B shows that the sealing material 31A is disposed in the recess 3g of the parting surface 3P of the back surface forming mold 3 in FIG. 2B, and the party of the coating film forming mold 2 in FIG. 3A is opposed to the sealing material 31A. The sealing material 32 is configured to be disposed in the concave portion 2g of the sealing surface 2P. Therefore, when the sealing material 31A is attached to the recess 3g and the sealing material 32 is attached to the recess 2g, the sealing material 31A slightly protrudes from the recess 3g and the sealing material 32 slightly protrudes from the recess 2g. Alternatively, either one of the sealing material 31A and the sealing material 32 may slightly protrude from the recess 3g or the recess 2g. Therefore, when the back surface forming mold 3 and the coating film forming mold 2 are clamped, the sealing material 31A and the sealing material 32 are pressed against each other and crushed, and the back surface forming mold 3 and the coating film forming mold 2 are pressed. It is possible to prevent a paint from leaking and to prevent the occurrence of burrs on the outer periphery of the in-mold coated product 23.

Next, as another modification of the above embodiment of the present invention, the sealing

materials

31 and 31A formed on the back surface forming mold 3 are applied to the parting surface 3P adjacent to the molding cavity forming portion of the back surface forming mold 3. The arrangement mode will be described in detail (see FIGS. 4A and 4B).

FIG. 4A and FIG. 4B are partial cross-sectional views in which the application portion A (see FIG. 1B) of the sealing material 31 is enlarged. In this aspect, unlike the above-described aspect, a part of the molding cavity 12 may include a molding cavity forming recess 3 h carved in the back surface forming mold 3. That is, the molding cavity 12 may be constituted by the molding cavity forming portion 1a of the front surface forming mold 1, the molding cavity forming portion 3a of the back surface forming die 3, and the molding cavity forming concave portion 3h. As a result of such a configuration, in the back surface forming mold 3, the molding cavity forming recess 3h and the parting surface 3P are adjacent to each other. The outermost position of the molded product 22 may be flush with the coating cavity forming portion 2a of the coating film forming mold 2 (see FIG. 4A).

Instead, the outermost position of the molded product 22 may be set to the outside of the coating cavity forming portion 2a of the coating film forming mold 2 so that paint leakage does not occur outside the molded product 22 (FIG. 4B). reference). That is, by extending the molding cavity forming recess 3h to the outside of FIG. 4A and disposing the recess 3g to the outside of FIG. 4A, a part of the molding cavity forming recess 3h is part of the coating film forming mold 2. It may be made to face the parting surface 2P. If constituted in this way, outside the coating cavity 13,
A portion where the molded product 22 and the parting surface 2P of the coating film forming mold 2 are in contact with each other and a portion where the sealing material 31A and the parting surface 2P of the coating film forming mold 2 are in contact with each other are arranged. . Therefore, the sealing material 31A crushed by the parting surface 2P of the coating film forming mold 2 when the back surface forming mold 3 and the coating film forming mold 2 are clamped is used as the back surface forming mold 3 and the coating film forming mold. By filling a slight gap between the mold 2 and the paint, it is possible to prevent the paint from leaking and to prevent the occurrence of burrs on the outer periphery of the in-mold coated product 23.

Hereinafter, materials or devices other than the in-mold coated product forming mold used for forming the in-mold coated product 23 will be described.

As a material for the thermosetting paint, for example, an oligomer such as a urethane acrylate oligomer having at least two (meth) acrylate groups, an epoxy acrylate oligomer, or a resin thereof, which uses an organic peroxide as an initiator for the curing reaction, or 20% to 70% by weight of unsaturated polyester resin, methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, (meth) acrylic acid, A radical scavenger mainly composed of vinyl acetate, tripropylene glycol diacrylate, 1,6-hexanediol diacrylate, or a vehicle component comprising 80 to 30% by weight of a copolymerizable ethylenically unsaturated monomer such as styrene. , Various color pigments, Aluminum pigments, pearl pigments, mold release agents, and one containing the light stabilizer and the like can be used.

The coating material injection machine 41 applies pressure to the upper part of the coating material tank 43 so that an accurate amount of the thermosetting coating material 44 for one shot is transferred from the coating material tank 43 to the coating material injection unit 42 having the structure of metering / injection / valve. It has a structure to be sent (see FIG. 5).

As the position setting of the coating material injection unit 42, it may be provided inside the coating film forming mold 2. Also, a thermosetting paint injection port provided in the coating film forming mold 2 is provided on the mating surface with the back surface forming mold 3, and the longitudinal axis direction of the paint injection unit 42 and the resin injection unit of the resin injection machine 41 are provided. You may arrange | position so that an injection | pouring direction may be orthogonally crossed. In this case, the back surface forming mold 3 holding the molded product 22 and the coating film forming mold 2 are closed, and the coating cavity 13 for coating the molded product 22 with a thermosetting paint is applied to the molded product 22. At the stage where it is formed between the film forming mold 2, the coating material injection unit 42 moves forward and directly touches the coating film forming mold 2, and the thermosetting coating material is transferred from the coating material injection unit 42 to the coating film forming mold 2. The structure is such that it is injected into the coating cavity 13 through a paint gate 2j (see FIG. 1B) provided in the mold 2.

The molding resin is not particularly limited, such as a normal thermoplastic injection molding resin or engineering plastic, or a thermosetting molding resin material. However, a molding resin that is easy to mold and has good adhesion to the thermosetting paint is preferable. Specific examples of the molding resin include acrylonitrile butadiene styrene resin (ABS resin), polyamide resin, polyethylene resin, polyester resin, polypropylene resin, polybutylene terephthalate resin, and polycarbonate resin. It is done.

The molding resin is filled into the molding cavity 12 by the resin injector 40. An injection molding machine can be used as the resin injection machine 40.

The in-mold coated product forming mold according to the above embodiment of the present invention is provided with a plurality of back surface forming molds 3 so that the movable plate or the rotating plate attached to the movable plate rotates. Can be placed on a molding machine (not shown). As the mold arrangement in the injection molding machine, the surface forming mold 1 and the coating film forming mold 2 are respectively fixed to a stationary platen and moved to a position between the surface forming mold 1 and the coating film forming mold 2. A board or a rotating board may be disposed, and the back surface forming mold 3 may be fixed to the movable board of the injection molding machine or the rotating board attached to the movable board. Alternatively, the back surface forming mold 3 may be fixed to a stationary platen, and the front surface forming die 1 and the coating film forming die 2 may be fixed to a movable plate of an injection molding machine or a rotating plate attached to the movable platen. When installed in this way, while the molded product 22 is formed by a certain back surface forming mold 3 and the front surface forming die 1, thermosetting is performed by the back surface forming mold 3 and the coating film forming die 2 holding another molded product 22. The in-mold coated product 23 can be manufactured at the same time as forming the conductive paint layer 21, that is, forming the molded product 22.

According to the above-described embodiment, the sealing

materials

31, 31 A, and 32 that are crushed when the back surface forming mold 3 and the coating film forming mold 2 are clamped are the back surface forming mold 3 and the coating film forming mold 2. It is possible to prevent the paint from leaking by filling a slight gap therebetween, and to prevent the occurrence of burrs on the outer periphery of the in-mold coated product 23.

An in-mold coated article 23 was manufactured using an in-mold coated article forming mold including a front surface forming mold 1, a coating film forming mold 2 and two back forming molds 3 each having a cavity on each of the front and back surfaces. . As the coating film forming mold 2, a coating film injection unit 42 having a paint injection port was used. As the back surface forming mold 3, a parting surface having a sealing material 31 disposed adjacent to the coating cavity forming portion of the back surface forming mold 3 and not facing the molding cavity 12 was used. For the production of the in-mold coated product 23, an injection molding machine for two-color molding in which a rotating disk attached to a movable plate rotates was used.

A molding cavity 12 formed by closing the back surface forming mold 3 facing the surface forming mold 1 with respect to the surface forming mold 1 is filled with a heat-melted solid color heat-resistant ABS resin, and cooled and solidified to form. Product 22 was formed (see FIG. 1A). Next, the rotating disk of the injection molding machine is rotated so that the mold facing the back surface forming mold 3 is transferred from the surface forming mold 1 to the coating film forming mold 2 while the back surface forming mold 3 holds the molded product 22. Then, the back surface forming mold 3 and the coating film forming mold 2 were closed to form a coating cavity 13 for coating the molded product 22 with a thermosetting paint (see FIG. 1B). An in-mold coated product 23 was formed by injecting a thermosetting paint (Praglas 8000 manufactured by Dainippon Paint Co., Ltd.) into the coating cavity 13 to form the thermosetting paint layer 21 (see FIG. 1C).

When the back surface forming die 3 and the coating film forming die 2 are clamped, the sealing material 31 is crushed, and a slight gap between the back surface forming die 3 and the coating film forming die 2 is filled. As a result, the burr due to the thermosetting paint layer 21 did not occur on the outer periphery of the in-mold coated product 23. Moreover, the shape defect of the molded article 22 and the thermosetting paint layer 21 did not occur.

Example 1 except that a sealing material 32 is formed on the coating film forming mold 2 and an in-mold coated product forming mold disposed on the parting surface adjacent to the coating cavity forming portion of the coating film forming mold 2 is used. In the same manner as above, an in-mold coated product 23 was formed (see FIG. 3A).

Also in this embodiment, the sealing material 32 is crushed when the back surface forming mold 3 and the coating film forming mold 2 are clamped, and a slight gap is formed between the back surface forming mold 3 and the coating film forming mold 2. Since the paint was prevented from leaking by filling, the burr due to the thermosetting paint layer 21 did not occur on the outer periphery of the in-mold coated product 23.

It should be noted that, by appropriately combining any of the above-described various embodiments or modifications, the effects possessed by them can be produced.

The in-mold coated product forming mold according to the present invention is such that the sealing material crushed when the back surface forming mold and the coating film forming mold are clamped is slightly between the back surface forming mold and the coating film forming mold. Therefore, it is possible to prevent the paint from leaking by filling a gap, and to prevent the occurrence of burrs on the outer periphery of the in-mold coated product.

Although the present invention has been fully described in connection with preferred embodiments with reference to the accompanying drawings, various variations or modifications will be apparent to those skilled in the art. Such changes and modifications are to be understood as being included therein unless they depart from the scope of the invention as defined by the appended claims.

Claims

Back surface forming mold (3);
A surface forming mold (1) which is clamped with the back surface forming mold to form a molding cavity (12) capable of forming a molded product (22) with the surface forming mold;
Instead of the surface forming mold, the mold is clamped with the back surface forming mold to hold a coating cavity (13) capable of forming a thermosetting paint layer (21) on the surface of the molded article. A coating film forming mold (2) formed by the back surface forming mold and the coating film forming mold;
A sealing material (31, 31A, 32) disposed on at least one of the parting surface (3P) of the back surface forming mold and the parting surface (2P) of the coating film forming mold; In-mold coated product forming mold.
The in-mold coated product forming metal mold according to claim 1, wherein the sealing material (31) is disposed at least at a position adjacent to the coating cavity forming portion (3c) of the back surface forming mold constituting the coating cavity. Type.
The sealing material (31A) is disposed at a position not facing the molding cavity and at a position where the parting surface (3P) of the back surface forming mold and the parting surface of the coating film forming mold face each other. The in-mold coated product forming mold according to claim 2.
The in-mold coated product forming mold according to claim 1, wherein the sealing material (31A) is disposed at a position adjacent to a molding cavity forming portion (3h) of the back surface forming mold constituting the molding cavity.
The in-mold coated product forming mold according to claim 1, wherein the sealing material (32) is disposed at a position adjacent to a coating cavity forming portion (2g) of the coating film forming mold constituting the coating cavity. .