JPH03101912A - In-mold coating device - Google Patents

Abstract

PURPOSE:To contrive an improvement in quality by preventing effectively generation of a pin-hole, by a method wherein after heating and compression of SMC under a state where the inside of a cavity is decompressed, a coating is applied to the surface of a product by an in-mold coating method. CONSTITUTION:After setting of SMC 13 to a bottom force 1, a top force 2 is lowered, when the top force 2 is lowered down to a position where the top force 2 is fitted in a packing 3 and pipes 5, 8 are communicated with each other by operating a changeover valve 6. After air in a space 14 between a bottom and top forces 1, 2 is sucked out into a chamber 10, the SMC 13 is compressed away while heating the same with the bottom and top forces 1, 2. Then at a phase when the SMC 13 arrives at a semicured state, the top force 2 is broken a little and the pipes 5, 7 are communicated with each other by operating a changeover valve 6. Then IMC paint in a tank 9 is sucked out into a gap 16 which is under a decompressed state and the gap 16 is filled with the IMC paint 17. Then the top force 2 is clamped again, the IMC paint 17 and a product 15 are heated and compressed and at a phase where those are cured sufficiently, the product 15 is released after raising of the top force 2.

Description

DETAILED DESCRIPTION OF THE INVENTION a. Field of Industrial Application The present invention relates to an apparatus for coating FRP molded products by an in-mold coating method. b. Conventional technology and its issues FRP (Fiberglass Reinforced
Plastics) @-shaped products have the disadvantage that they tend to form vinyl poles on their surfaces. The following are known countermeasures: One is to perform SMC with the cavity inside the mold depressurized.
(Sheet Molding Co+mound)
This is a method of admonishing. 8 to 10 are diagrams showing the procedure, in which the upper mold 20 is connected to the lower mold 2 as shown in FIG.
when the air in the space 23 between the upper mold 20 and the lower mold 21 is lowered to the position where it engages with the packing 22 of the pipe 24.
It is designed to suck it out. After reducing the pressure inside the cavity in this way, the upper mold 20 is opened as shown in FIG.
The SMC 25 is heated and compressed using the lower die 2L.
The other method is to apply paint to the surface of the product using an in-mold coating method (Special Publication Publication No. 59-2).
(See No. 3552). 11 to 13 are diagrams showing the procedure, in which the SMC 28 is formed by the upper mold 26 and the lower mold 27.
is heated and compressed (see Fig. 11), and when it is in a semi-hardened state, the upper mold 26 is slightly opened. Then, as shown in FIG. 12, in-mold coating paint 30 (
After injecting the IMG paint (hereinafter referred to as IMG paint), the upper mold 2
6 is closed and the material 30 and SMC 28 are heated and compressed. However, neither method could be expected to have a sufficient effect and was not very useful in improving quality. In addition, in the case of the in-mold coating method, there was a problem in that the IMC paint injection machine was expensive and the equipment cost increased. C. Means for Solving the Problems The present invention has been made in view of the above circumstances, and its purpose is to provide an in-mold coating device that can effectively prevent the occurrence of pin poles.
The gist is that in an in-mold coating device that applies a thermosetting coating to the surface of a PRP molded product, an upper mold and a lower mold are fitted together so that the cavity is sealed, and a switching valve is connected to the cavity. An in-mold coating apparatus is characterized in that the paint tank for in-mold coating is connected to a vacuum degassing means through an in-mold coating material tank. Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings. In Figure 1, 1 is the lower mold and 2 is the upper mold. The lower mold 1 is fitted into the upper mold 2, and a packing 3 is provided on the surface of the lower mold 1 that is mated with the upper mold 2. Then, the packing 3
The cavity 4 between the lower mold l and the upper mold 2 is sealed. Further, the cavity 4 is connected to one end of a switching valve 6 via a pipe 5, and the other end of the valve 6 is connected to an IMC l material tank 9 and a chamber 10 via vibrators 7 and 8, respectively. ．． Furthermore, the chamber 1
0 is connected to a vacuum pump 12 via an on-off valve 11. Next, we will explain the procedure for performing FRP precepts using this device. In advance, lower mold 1 and upper mold 2 are heated and maintained at a predetermined temperature. Further, after sucking out the air in the chamber 10 with the vacuum pump 12 and reducing the pressure in the chamber IO to a predetermined value, the on-off valve 11 is closed. First, the second
After setting the SMC13 on the lower mold 1 as shown in the figure,
Lower the upper mold 2. When the upper mold 2 has descended to the position where it engages with the packing 3 as shown in FIG. The air in the space l4 between the chamber l
After suctioning into O, as shown in Figure 4, S? IC 13
is heated and compressed by the lower mold 1 and the upper mold 2.

Then, when the SMC 13 reaches a semi-hardened state, the upper mold 2 is slightly opened as shown in FIG. Therefore, the gap 1 created between the upper mold 2 and the product 15
6 is in a depressurized state. ) Operate the switching valve 6 to connect the vibrator 5 and the vibrator 7. Then, the IMC paint in the tank 9 is sucked out into the gap 16 under reduced pressure, as shown in FIG. 6, and the gap 16 is filled with the IMC paint 17. Then, close the upper mold 2 again and IMC
The paint 17 and the product 15 are heated and compressed, and when they are sufficiently cured, the upper mold 2 is raised as shown in FIG. 7, and then the product 15 is released from the mold. In this embodiment, the cavity 4 between the lower mold 1 and the upper mold 2 is communicated with the TMC l material tank 9 and the chamber 10 via the switching valve 6, so that the upper mold 2 has only one vibrator 5.
All you need to do is place the

d. Effects of the Invention In the present invention, the SMC is heated and compressed while the pressure inside the cavity is reduced, and then the surface of the product is coated using an in-mold coating method, which effectively prevents the occurrence of bottle balls. This will improve quality. Furthermore, since an injection machine for IMC paint is not required, a cost advantage can also be obtained.

[Brief explanation of drawings]

Fig. 1 is a diagram conceptually showing an embodiment of the present invention, and Figs. 2 to 7 respectively show the procedure for performing FRP ceremonial using the device shown in Fig. 1 and the connection state of the switching valve at each stage. Figures 8 to 10 show the conventional F
Figures 11 to 13 are diagrams showing the procedure of RP molding, and Figures 11 to 13 are diagrams showing the procedure of the conventional in-mold coating method, respectively. l...Lower mold, 3...Packing, 5,7.8...Pipe, 9...IMC paint tank, 12...Vacuum bomb, l5...Product, 2...Upper mold , 4... Cavity, 6... Switching valve, 10... Chamber 13... SMC, 17... IMC paint. Patent applicant Suzuki Motor Co., Ltd. (and 2 others) 12 -72-

Claims (1)

[Claims] In an in-mold coating device that applies a thermosetting coating film to the surface of an FRP molded product, an upper mold and a lower mold are fitted together so that the cavity is sealed, and the cavity is connected to the in-mold via a switching valve. An in-mold coating device characterized by being connected to a coating paint tank and a vacuum degassing means.