JP2686789B2 - Method for producing different color epidermis - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for producing color-coded different-colored skins used as skins for interior materials of automobiles and the like.

(Prior Art) Synthetic resin skins are often used for the skins of automobile interior materials, such as instrument panels, but the synthetic resin skins are color-coded on a certain line in order to further enhance the decorativeness. Different colored epidermis may be used.

As a conventional method for producing the above-mentioned different color skin, there is disclosed in
There is a method described in JP 62-18230 A. The method is to melt and melt (gel) the powdery resin on a part of the heated mold surface, and then melt the powdery resin of a different color from the powdery resin on the resin non-adhesive part of the mold surface, A film-shaped molded product obtained by cooling the molten resins and solidifying them together is peeled from the mold to obtain a different color skin.

(Problems to be solved by the invention) However, in the method for producing a different-colored skin, powdery resins having different colors attached to the mold surface are viscous when melted, so that the boundary is difficult to be constant. Moreover, there is a problem that powdery resins having different colors are partially mixed in the vicinity of the boundary portion and the boundary is liable to be unclear.

Therefore, the present invention is to provide a method for manufacturing a different-colored skin, which can make the boundary of the color constant at the time of manufacturing the different-colored skin, and can also make the boundary clear.

(Means for Solving the Problems) In order to achieve the above object, the present invention is directed to bringing a flat nozzle close to a heated mold surface, extruding a paste-like resin from the nozzle, and pressing the paste resin onto the mold surface. Forming a boundary portion on the surface, a powdery resin of different color is attached to the mold surface on both sides of the boundary portion, the paste resin forming the boundary portion and the powdery resin attached are integrated together by gelling,
After that, the film-shaped molded product obtained by cooling and solidifying was peeled from the mold surface to produce a different color skin.

(Function) The paste-like resin that is pressure-bonded to the heated mold surface forms a clear line and forms a boundary portion on the mold surface because it is paste-like. Then, the boundary portion made of the paste resin starts to gel due to the heat retained by the mold. Following that, powdery raw materials with different colors attached to the mold surfaces on both sides of the boundary,
As described above, the gel is formed integrally with the boundary portion that has already begun to gel, and is then solidified by cooling to form a film-shaped molded product that matches the shape of the mold surface. Then, the film-shaped molded product is peeled off from the mold surface to obtain a different color skin having different colors on both sides of the boundary portion made of the paste resin.

(Example) Hereinafter, a method for manufacturing a different color skin according to an example of the present invention will be described with reference to the drawings in accordance with manufacturing steps. 1 to 5 are cross-sectional views showing the manufacturing of the different color skin.

First, as shown in FIG. 1 and FIG. 2 in which the portion A is enlarged, the flat nozzle 10 is brought close to the mold surface 12 so that the paste resin 14 is pressed out from the nozzle 10 and pressed. To do. The paste-like resin 14 pressure-bonded to the mold surface 12 is
A line-shaped boundary portion 15 is formed on the mold surface 12.

The mold 16 having the mold surface 12 of the predetermined shape has a heat medium circulation pipe 18 piped on the outer surface thereof, and heating oil or the like is caused to flow through the circulation pipe 18 to heat the mold surface 12 to a predetermined temperature. On the other hand, the flat nozzle 10 has a width from one end to the other end of the mold surface 12, and is movable up and down so that it can approach the mold surface 12 and move away from the mold surface 12. The paste-like resin 14 extruded from the nozzle 10 is generally a vinyl chloride resin paste, and has a predetermined color, preferably the same color as one color of the powder-like resin described later.
Further, the viscosity of the paste-like resin 14 is preferably as high as possible to be extruded from the nozzle 10, the paste-like resin pressed onto the mold surface 12 is less likely to flow, and the line-shaped boundary portion 15 formed on the mold surface. Is preferable because it does not collapse.

In this way, the boundary portion made of the paste-like resin that is pressure-bonded to the mold surface 12 starts to gel due to the heat of the mold surface.

Next, after moving the nozzle 10 away from the mold surface 12, as shown in FIG. 3, the bucket 24 in which the powdery resins 20 and 21 of different colors are separated and divided by the partition wall 22 is raised to close the opening of the mold 16. Then, it is brought into close contact with the periphery of the opening. At this time, the tip of the partition wall 22 for partitioning the inside of the bucket 24 is pressed against the boundary portion 15 made of paste-like resin to partition the inside of the mold 16. As the powdery resin, those used for ordinary powder slush molding, such as vinyl chloride resin powder, are used. Further, the bucket 24 is also movable to the left and right so as not to get in the way when taking out a film-shaped molded product to be described later.

Then, as shown in FIG.
Rotate by ° to attach the powdery resin 20, 21 to the mold surface. At that time, since the inside of the mold 16 and the inside of the bucket 24 are partitioned by the partition wall 22, the powdery resins 20 and 21 adhere to the mold surfaces 26 and 27 on both sides of the boundary portion 15 and the boundary portion 15 without mixing, and form a boundary. It is integrated with part 15. Then, the powdery resin 20, 21 is heated by the heat of the mold surface, and the boundary 15
At the same time, gelation proceeds.

Then, as shown in FIG. 5, the mold 16 and the bucket 24 are returned to their original positions.
Then, according to the usual powder slush molding method, mold 16
When the film-shaped molded product obtained by cooling and solidifying is removed from the mold surface, a different color skin 28 shown in FIG. 6 is obtained. The different-colored epidermis 28 obtained in this way is clearly separated by the line 30 formed from the boundary portion on both sides of the line 30.

The different-colored skin 28 in this figure is one in which the color of the paste-like resin forming the boundary is the same as that of one powder-like resin, and the color unique to the line 30 does not appear. On the other hand, if the color of the paste-like resin is different from the color of any powder-like resin, a color unique to that line appears.

Further, FIG. 7 is a cross-sectional view showing the production of the different color skin in the embodiment other than the present invention. In this example, the bucket
The partition wall 34 for partitioning the inside 32 is also used as a nozzle for extruding the paste-like resin, and in other respects it is the same as the above-mentioned embodiment. In the figure, 36 is a mold, and 40 and 41 are powdery resins having different colors.

The present invention is not limited to the case of manufacturing the two-color skin as described above, but is also applied to the manufacture of a multicolor skin of three or more colors.

(Effect) In the present invention, a paste-like resin extruded from a flat nozzle is pressure-bonded to a heated mold surface to form boundaries, and powdery resins of different colors are attached to both sides of the boundaries to form boundaries. It forms a different color epidermis in combination with.

Therefore, the line-shaped clear boundary formed on the mold surface becomes the boundary of the different-colored skin as it is, so that the different-colored skin having clear color boundaries can be obtained. Further, since the boundary portion is formed by the paste-like resin extruded from the nozzle, by keeping the position of the nozzle constant, it is possible to obtain a different color skin in which the color boundary is always constant.

[Brief description of the drawings]

1 to 5 are sectional views showing an embodiment of the present invention, FIG. 6 is a partial perspective view of a different color skin obtained by the practice of the present invention, and FIG. 7 is a sectional view showing another embodiment. Is. 10: nozzle, 12: mold surface, 14: paste resin, 15: boundary part,
21,22: Powder resin

Claims (1)

(57) [Claims] 1. A flat nozzle is brought close to a heated mold surface,
A paste-like resin forming the boundary portion is formed by forming a boundary portion on the mold surface by extruding a paste-like resin from the nozzle and press-bonding it to the mold surface, and adhering powder resin of a different color to both sides of the boundary portion. A method for producing a different-colored skin characterized in that the film-like molded article obtained by gelling and adhering the powdery resin adhered together with the resin is then solidified by cooling.