JPH0582515U - In-mold coater - Google Patents

Abstract

(57) [Abstract] [Purpose] Lower mold 10 having a convex cavity surface 10a.
And an apparatus for forming an in-mold coat layer on the surface of a resin molded product C set in a cavity formed by an upper mold 12 having a convex cavity surface 10a and a corresponding concave cavity surface 12a. The purpose is to prevent the so-called short coat or air smear from being generated on the surface of the resin molded product C. [Structure] A paint is press-fitted from a paint press-fitting device 16 through a paint supply passage 18 into a cavity formed by a lower mold 10 and an upper mold 12. A heater 20 is provided on an edge portion 12b of the upper die 12 outside the cavity surface 12a. The heater 20 heats the edge portion 12b of the upper die 12 to expand it when pressurizing the paint. A paint inflow gap 26 is formed between the surface of the edge of the resin molded product C and the edge of the cavity surface 12a of the upper mold 12.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an in-mold coater.

[0002]

[Prior Art]

 As the above in-mold coater, as shown in Japanese Patent Laid-Open No. 3-164218, a paint is press-fitted into a cavity of a molding die, and the resin molding is set along the surface of the resin. An apparatus is known in which a coating layer is formed on the surface of the resin molded article by pressure-feeding the coating material.

[0003]

[Problems to be solved by the device]

 By the way, when the resin molded product has a flat shape and the molding surfaces of the upper mold and the lower mold constituting the molding mold are flat as shown in JP-A-3-164218, there is no particular problem. The resin molded product has an edge, and the molding die forming the resin molded product has a lower mold having a convex cavity surface and a concave cavity surface corresponding to the convex cavity surface. When it is composed of an upper mold, a so-called short coat (a state in which the paint does not sufficiently spread on the surface) or an air dome (the air inside the cavity does not escape and remains on the surface of the resin molded product) There may be a situation in which bubbles are formed in). That is, in the in-mold coater, only a small gap (corresponding to the thickness of the coating layer) is formed between the surface of the resin molded product set in the cavity and the cavity surface facing the surface. Is normal. For this reason, if the paint is pressed along the surface of the resin molded product in the cavity, the paint may not spread over the entire surface of the resin molded product, and the air in the cavity will not escape and the resin will not escape. This is because it may remain on the surface of the molded product.

In view of the above, the present invention sets in a cavity formed by a convex mold having a convex cavity surface and a concave mold having a concave cavity surface corresponding to the convex cavity surface. The present invention is intended for an apparatus for forming an in-mold coat layer on the surface of a molded resin product, which is intended to prevent so-called short coats and air blemishes from occurring on the surface of the molded resin product.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention expands the edge of the concave mold when press-fitting the paint so that the edge surface of the resin molded product and the edge of the cavity surface of the concave mold are separated from each other. The gap between them is enlarged.

Specifically, the solution means taken by the present invention is a cavity formed by a convex mold having a convex cavity surface and a concave mold having a concave cavity surface corresponding to the convex cavity surface. Targeting an in-mold coater for forming a coat layer on the surface of the resin molded product by press-fitting the paint along the surface of the resin molded product set inside the concave mold of the concave mold. A heating means is provided at an edge portion outside the cavity surface to heat and expand the edge portion of the concave mold when press-fitting the coating material.

[0007]

[Action]

 With the above structure, when the paint is press-fitted, the heating means for heating and expanding the edge of the concave mold when the paint is press-fitted is provided at the edge of the concave mold outside the cavity surface. Since the edge of the concave mold expands, the gap between the surface of the edge of the resin molded product in the cavity and the cavity surface of the edge of the concave mold becomes large.

[0008]

【Example】

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

FIG. 1 shows a sectional structure of an in-mold coater A according to an embodiment of the present invention. In FIG. 1, reference numeral 10 is a lower mold as a convex mold having a convex cavity surface 10a. , 12 are upper molds as concave molds having a concave cavity surface 12a corresponding to the shape of the cavity surface 10a of the lower mold 10. Reference numeral 14 is an elevating cylinder for moving the upper mold 12 up and down with respect to the lower mold 10, and 16 is a paint press-fitting device. The paint press-fitting device 16 comprises a cavity surface 10a of the lower mold 10 and a cavity surface 12a of the upper mold 12. Paint is press-fitted into the formed cavity through the paint supply passage 18 formed in the upper mold 12.

Further, in the figure, 20 is a heater as a heating means provided annularly on an edge portion 12b outside the cavity surface 12a of the upper die 12, and the heater 20 is controlled by a control means (not shown). The power is supplied from the paint press-fitting device 16 before the paint is press-fitted into the cavity, and the power supply is stopped after the press-fitting of the paint is completed.

Hereinafter, the molding process and the in-mold coating process of a resin molded product using the in-mold coating device A will be described with reference to FIGS. 1 to 5.

First, as shown in FIG. 1, the molding resin material B that has been heated and softened in advance is placed on the cavity surface 10 a of the lower mold 10.

Next, as shown in FIG. 2, the elevating cylinder 14 is lowered and the molding resin material B is pressed by the lower mold 10 and the upper mold 12 to obtain a resin molded product C. In this press step, the heater 20 is not energized, and as shown in detail in the partially enlarged view of FIG. 3, there is a gap between the edge 10a of the lower die 10 and the edge 12a of the upper die 12. Ring-shaped lifting gaps 22 and 22 are formed for smooth lifting of the upper mold 12.

Next, as shown in FIG. 4, the heater 20 is energized to expand the edge portion 12b of the upper mold 12, and the lifting cylinder 14 is operated to move the upper mold 12 slightly upward. By doing so, as shown in detail in the partially enlarged view of FIG. 5, the paint is distributed over the entire surface between the cavity surface 10a of the lower mold 10 and the cavity surface 12a of the upper mold 12 which are vertically opposed to each other. A gap 24 is formed, and between the edge portion 10b of the lower mold 10 and the edge portion 12b of the upper mold 12, a paint for smoothly flowing into the surface of the edge portion of the resin molded product C is formed. The paint inflow gaps 26, 26 are formed. In this state, when the paint is press-fitted into the cavity from the paint press-fitting device 16 through the paint supply passage 18, the paint smoothly flows into the paint inflow gap 26 through the paint circulation gap 24. Therefore, since the coating material is sufficiently spread on the surface of the resin molded product C, a short coat is not generated, and the air existing in the coating material flow gap 24 is pressed by the coating material and passes through the coating material flow gap 26 to form a cavity. Since it leaks to the outside of the room, there is no air damage.

In the above description, the case where the molding resin material B is placed on the cavity surface 10 a of the lower mold 10 and the molding resin material B is press-molded by the lower mold 10 and the upper mold 12 has been described. In the in-mold coater according to the present invention, a resin molded product C previously molded by another molding device such as an injection molding device is set on the cavity surface 10a of the lower mold 10 and the surface of the resin molded product C is set. It is also applied when an in-mold coat layer is formed on.

In this embodiment, the lifting cylinder 14 is actuated to move the upper mold 14 slightly upward to form the paint flow gap 24. However, the mold clamping pressure of the lifting cylinder 14 is prevented. When the paint is press-fitted into the cavity from the paint pressurizing device 16 by the pressure applied, it is not necessary to open the gap 24, and the heater 20 is energized to prevent the paint from flowing smoothly into the edge 10b of the lower mold 10. It is only necessary to form the paint inflow gap 26.26 between the lower mold 12 and the edge portion 12b.

[0017]

[Effect of the device]

 As described above, since the heating means for heating and expanding the edge of the concave mold when the paint is press-fitted is provided at the edge of the concave mold outside the cavity surface, when the paint is press-fitted. , The edge of the concave mold expands and the gap between the surface of the edge of the resin molded product and the cavity surface of the edge of the concave mold expands, so it is pressed along the surface of the resin molded product. The paint smoothly flows into the edge surface of the resin molded product.

As described above, according to the present invention, the coating material smoothly flows into the surface of the edge portion of the resin molded product, so that so-called short coat or air smear does not occur on the surface of the resin molded product.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a step of setting a molding resin material in a method for manufacturing a resin molded product, which is performed using an in-mold coater according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a press molding step in the method for manufacturing a resin molded product.

FIG. 3 is a partially enlarged view of FIG.

FIG. 4 is a cross-sectional view showing an in-mold process in the method for producing a resin molded product.

FIG. 5 is a partially enlarged view of FIG.

[Explanation of symbols]

 A In-mold coater B Molding resin material C Molded product 10 Lower mold (convex mold) 10a Cavity surface 10b Edge 12 Upper mold (concave mold) 12a Cavity surface 12b Edge 16 Paint press fitting device 18 Paint supply path 20 heater (heating means) 26 paint inflow gap

Claims (1)

[Scope of utility model registration request] 1. A surface of a resin molded product set in a cavity formed by a convex mold having a convex cavity surface and a concave mold having a concave cavity surface corresponding to the convex cavity surface. By press-fitting the paint along, an in-mold coater for forming a coat layer on the surface of the resin-made molded article, at the outer edge of the concave cavity surface of the concave mold,
An in-mold coater characterized by comprising heating means for heating and expanding the edge of the concave mold when the paint is press-fitted.