JPH10329156A - Different-color plastic skin and molding thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simultaneously and integrally mold a plurality of different color parts, in a plastic skin wherein different color parts are subjected to powder slush molding on both sides of an elongated boundary member, by fusing the boundary member to the edges of the different color parts by heat at a time of powder slush molding. SOLUTION: A plurality of different color parts 11, 15 are mutually different in color and the edges 12, 16 on the side of the boundary member 21 of the different color parts 11, 15 are bent to the rear of the skin 10. The elongated boundary member 21 is fused to the edges 12, 16 of the different color parts 11, 15 by heat at a time of the powder slush molding of the different color parts 11, 15 and the respective different color parts 11, 15 are integrated on the surface or rear side of the skin 10 by extrusion molding and material quality is pref. same in the different color parts 11, 15 in consideration with the weldability of both parts 11,15. The boundary member 21 has an almost U-shaped cross section depressed toward the rear of the skin 10. Both ends (free ends) 22, 23 in the lateral direction of the U-shape are molded to the edges 12, 16 of the different color parts 11, 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color-coded different color plastic skin and a method of molding the same.

[0002]

2. Description of the Related Art A plastic skin (also referred to as a plastic sheet) of a predetermined shape formed by vacuum molding or slash molding is frequently used as a skin covering the surface of an instrument panel of an automobile or a foam molded product of a seat. Have been. In addition, foamed molded products and the like, from the point of decorative properties and the like,
As shown in FIG. 9, a different color plastic skin 70 that is classified into two or more colors may be used.

[0003] As the different color plastic skin 70,
It is known that a plurality of different-color portions 71 and 75 having different colors are separately formed by powder slush molding, sol slash molding, or the like. A concave portion 72 is provided on one side wall of one different color portion 71 and a convex portion 76 is formed on one side wall of another different color portion 75 so as to form the foam on the back surface of the skin 70. At the time of integral foam molding, the concave portion 72 and the convex portion 76 were fitted together, and the skin 70 was arranged on the mold surface of the foam molding die, and the different colored portions 71 and 75 were connected simultaneously with the molding of the foam.

However, in this configuration, each of the different color portions 71, 7
5 have to be separately formed and then connected, which requires many man-hours and is disadvantageous in cost. In addition, it is difficult to form the concave portion 72 and the convex portion 76 with high precision. If the concave portion 72 and the convex portion 76 have low precision, the fitting of the two becomes poor, or the different color portions 71 and 75 are formed. At the boundary portion, a step or the like may be formed, and the appearance of the skin 70 may be impaired.

[0005] Further, since the different colored portions 71 and 75 do not have good sealing properties, a minute gap 80 may be formed at the boundary. Therefore, when foam molding is performed integrally with the skin using the different-color plastic skin 70, there is a possibility that the foaming material leaks from the gap 80 during the foam molding, resulting in molding failure. Further, there is another problem that, when the skin 70 is placed on the foaming mold in the skin integral foam molding, the different color portions 71 and 75 are separated from each other, thereby deteriorating the work efficiency of the foam molding.

[0006]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of such a situation, and is capable of easily and simultaneously forming a plurality of different color portions having different colors from each other simultaneously, economically and economically. It is an object of the present invention to provide a different color plastic skin having a good appearance and a method for molding the same.

[0007]

That is, the invention of claim 1 is a plastic skin in which different colored portions having different colors are formed on both sides of an elongated boundary member by powder slush molding, wherein the boundary member is formed by powder slush molding. The present invention relates to a different color plastic skin which is welded to the edge of the different color portion by the heat of the above.

According to a second aspect of the present invention, in the first aspect, the boundary member has a substantially U-shaped cross section depressed to the back side of the skin, and both ends of the U-shaped portion are welded to the edge of the different color portion. Features.

According to a third aspect of the present invention, a bucket accommodating a plastic powder and a molding die having a mold surface are rotated in combination, and the plastic powder in the bucket is heated by the combination of the mold surface and the heated mold surface. To form a molten plastic film on the mold surface and then form a plastic skin by powder slush molding for cooling and hardening, when a partition plate is erected on the bottom surface of the bucket and partitioned by the partition plate. Each of the plurality of accommodating portions accommodates a plastic powder of a different color, and when combining the bucket and the mold, an elongated plastic boundary member at least both widthwise portions of which are melted by heat of the mold surface during powder slush molding. The bucket and the mold are partitioned into a plurality of parts by being sandwiched between the end of the partition plate and the mold surface, and the rotation and Sometimes, different colored plastic powders are adhered to the mold surfaces on both sides of the boundary member to form a molten plastic film of different colors, and both sides of the boundary member are melted and joined to the molten plastic films of different colors. And a method of forming a different color plastic skin, wherein a different color plastic skin having different color portions on both sides of the boundary member is obtained by subsequent cooling and hardening.

According to a fourth aspect of the present invention, in the third aspect, a support projection for a boundary member is erected at a position facing the tip of the partition plate on the mold surface of the mold, and the support projection and the tip of the partition plate are provided. It is characterized in that a boundary member is sandwiched between them.

Further, according to a fifth aspect of the present invention, in the fourth aspect, the boundary member has a substantially U-shaped cross section and is detachably attached to the support projection.

Still further, the invention according to claim 6 is based on claim 5.
Wherein a boundary member having a substantially U-shaped cross section is provided with a gap between both ends (free ends) in the width direction of the boundary member and the mold surface, and is fitted to the support projection.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a perspective view showing a different color plastic skin according to one embodiment of the present invention, FIG. 2 is an enlarged sectional view showing a main part thereof, and FIG. 3 is an enlarged cross section showing a main part of a different color plastic skin according to another embodiment. FIG. 4 is a partial perspective view showing a part of a molding apparatus used in a method of molding a different color plastic skin, FIG. 5 is a cross-sectional view showing an example of a method of molding a different color plastic skin when the molding apparatus is rotating, and FIG. FIG. 7 is a sectional view showing an example of manufacturing a foam molded article using the different-color plastic skin of FIG. 1, and FIG. 8 shows a foam molded article produced thereby. It is sectional drawing.

The different color plastic skin 10 shown in FIG.
As described in the section of the prior art, it is used for improving the decorativeness of a foam molded product or the like, and includes a plurality (two in this example) of different color portions 11 and 15 and a boundary member 21. , When the boundary member 21 is formed,
Are welded to the edges 12, 16.

The different colored portions 11 and 15 are made of a plastic film formed by a known powder slush molding method, and the plurality of different colored portions 11 and 15 have different colors. The edges 12, 16 of the different color portions 11, 15 on the boundary member 21 side in this embodiment are
It is bent to the back of 0.

The elongated boundary member 21 is connected to the different color portion 11,
The heat of the powder slush molding of No. 15
15 are welded to the edges 12 and 16 to integrate the different colored portions 11 and 15 on the front side or the back side of the skin 10, and are formed by extrusion molding or the like. In consideration of this, it is preferable to use the same material as the different color parts 11 and 15. The boundary member 21 of this embodiment has a substantially U-shaped cross section depressed to the back side of the skin 10, and as can be better understood from FIG. 2, both ends (free ends) 22, 23 in the width direction of the U-shape.
Reference numeral 23 is welded to the edges 12, 16 of the different color portions 11, 15. With such a shape, different-color portions 11, 1 described later are formed.
The arrangement of the boundary member 21 in the mold during the slash molding of No. 5 is facilitated. Also, as shown in FIG.
It is preferable that the welded portion between 1 and the edges 12 and 16 of the different color portions 11 and 15 be located on the back side of the skin 10. Then, the boundary member 21 and the welded portion do not appear on the surface of the skin 10 and the skin 1
There is no need to worry about the appearance of No. 0.

In the boundary member 21 having a substantially U-shaped cross section, the center bottom portion 24 is made of a material that is not melted by heat at the time of forming the different color portions 11 and 15, while the width direction ends 22 and 23 are formed at the same time. Edges 1 of different color parts 11 and 15 melted by heat
It is preferable to use a material that is welded to 2,16. In this way, not only is the molten portion of the boundary member 21 constant during the slush molding of the different-color portions 11 and 15, but also the different-color portions 11 and 15 are separated and formed by the melting of the bottom portion 24. Can be prevented. In this example, the different color portion 1
1 and 15 are made of vinyl chloride resins having different colors from each other, while the boundary member 21 has a central bottom portion 24 having a melting point higher than that of the different color portions 11 and 15 and both ends 22 and 23 having different color portions 11 and 15. It is composed of a vinyl chloride resin having a melting point approximately equal to 15. Further, the boundary member 21 of this example has a thickness of 2 mm near both ends 22 and 23, a thickness of the central bottom portion 24 of about 4 mm, and an overall height of 12 mm. The boundary member 21 is entirely composed of the different color portion 11,
15 may be formed of one material having the same melting point, and the thickness of the central bottom portion 24 may be larger than the thickness of both ends 22 and 23. Then, at the time of powder slush molding of the different-color portions 11, 15, both ends 22, 23 of the boundary member 21 are welded to the different-color portions 11, 15 by melting, and the central bottom portion 24 is not completely melted without being completely melted. Part 11,
15 can be connected.

Further, the boundary member is not limited to the above-mentioned shape, and may be, for example, a boundary member 21A having a substantially rectangular cross section as shown in FIG. This boundary member 21A
Are welded to the edges 12A and 16A of the different color portions 11A and 15A at both side portions 22A and 23A in the width direction. The boundary member 21A is located on the back side of the skin 10A so that the appearance of the skin 10A is not impaired.
It is preferable to be concealed between 1A and 15A.

Next, a description will be given of a molding apparatus used in a method for molding a different color plastic skin according to an embodiment of the present invention. The molding apparatus 30 shown in FIG. 4 is used when powder slush molding is performed on a different color plastic skin, and includes a bucket 31 and a molding die 41. The molding device 30 is provided with a conventionally known rotating device (not shown) so as to rotate at the time of powder slush molding.

The bucket 31 accommodates plastic powders P1 and P2 made of vinyl chloride resin or the like.
The flange portion 33 is formed so as to be able to be joined. A partition plate 35 having an appropriate height is provided upright on the bottom surface of the bucket 31, and a plurality of powder accommodating portions 3 accommodating plastic powders P1 and P2 of different colors.
7, 38 are provided. In the drawing, the width of the distal end 36 of the partition plate 35 is set larger than the width of the boundary member 21 so that the boundary member 21 is stably held.

The molding die 41 is made of an electroforming mold, has a molding surface 42 in the shape of a molded product, and a flange portion 44 that fits the flange portion 33 of the bucket 31 is provided on the outer periphery of the opening 43. On the back side of the mold surface 42, an appropriate number of appropriate heating means 45 such as a heating medium circulation pipe such as heating oil are provided in order to heat the mold surface 42 to a predetermined temperature during powder slush molding. In this example, the mold surface 42 is provided on the bucket 31 as in the invention of claim 4.
A partition member support projection 46 having a predetermined height is provided upright at a position facing the distal end 36 of the partition plate 35.

Next, a method for molding the different color plastic skin 10 using the molding apparatus 30 will be described. First, as shown in FIG. 5, the plurality of storage portions 37, 38 of the bucket 31 store plastic powders P1, P2 made of vinyl chloride resin or the like of different colors, respectively. The boundary member 21 having a substantially U-shaped cross section is detachably fitted to the support projection 46 of the molding die 41. The boundary member 21 of this embodiment has a substantially U-shaped cross section extruded from a vinyl chloride resin or the like. The melting point of the bottom portion 24 at the center is higher than that of the plastic powders P1 and P2, and both ends 22 and 23 are plastic powders. P1, P
It has a melting point comparable to 2. Further, in this embodiment, when the boundary member 21 is fitted on the support projection 46, the invention of claim 6 is applied, and the boundary member 21 is raised from the height of the support projection 46.
Is made small, and a gap is formed between both ends 22, 23 of the boundary member 21 and the mold surface around the base 46a of the support projection 46. In this case, as described later,
The appearance of the skin 10 can be enhanced without the boundary member 21 appearing on the surface of the skin 10 after molding. If the distance between the two ends 22, 23 of the boundary member 21 and the mold surface 42 is too large, the mold surface 42 is formed at the time of powder slush molding described later.
The two ends 22, 23 of the boundary member are less likely to be heated and melted by the heat of the above, so that the distance between the ends 22, 23 is appropriately set so that the melting of the both ends 22, 23 is not hindered. In this example, it is 1 mm.

The boundary member 21 having a substantially U-shaped cross section is used.
Is, as described above, the plastic powder P.
1, made of one material having the same melting point as P2,
In addition, the thickness of the central bottom portion 24 is made larger than the thickness of both ends 22, 23, so that the bottom portion 24 does not completely melt at the time of forming a different color portion later, and only the both ends 22, 23 melt to form a different color portion. You may make it weld.

Further, the above-described boundary member 21 having a substantially rectangular cross section is used.
When A is used, the boundary member 21A is placed on the tip end 36 of the partition plate 35 of the bucket 31. At this time, it is preferable that the width of the distal end 36 is larger than the width of the boundary member 21A so that the boundary member 21A is stably mounted.

Next, the bucket 31 and the forming die 41 are combined by a clamp or the like. At the time of this combination,
The boundary member 21 is sandwiched between the support projection 46 of the molding die 41 and the tip end 36 of the partition plate 35 of the bucket 31, and the support projection 46 and the partition plate 35 divide the bucket 31 and the interior of the molding die 41 into a plurality. Then, the mold surface 42 of the molding die 41
A known powder slush molding in which the mold 41 and the bucket 31 are rotated a required number of times while heating is performed.
The molding conditions such as the heating temperature and the number of revolutions (heating time) of the mold surface 42 at this time are determined by plastic powders P1 and P2.
In addition, both ends 22 and 23 of the boundary member are melted and the bottom portion 24 of the boundary member is set so as not to be melted. Specifically, the melting temperature of the plastic powders P1 and P2 and the both ends 22 and 23 of the boundary member and the bottom portion 24 are set. Is determined in consideration of the melting temperature, the thickness of the skin to be formed, and the like.

By the rotation, the receiving portion 3 of the bucket 31
The plastic powders P1 and P2 in the molds 7 and 38 move to the heated mold surface 42 and adhere to both sides of the boundary member of the mold surface 42. As shown in FIG. The molten plastic films 11a and 15a having the following are formed. Further, both ends 22, 23 of the boundary member 21 are melted and welded to the edges of the molten plastic films 11a, 15a. At this time, the bottom portion 24 of the boundary member 21 does not melt, but connects the molten plastic films 11a and 15a.

Thereafter, by cooling the mold surface 42, the molten plastic films 11a and 15a are cooled and hardened, and are removed from the molding device 30, and as shown in FIG. Thus, a different-color plastic skin 10 having excellent decorativeness, in which 11, 15 are connected, is obtained. According to this molding method, a plurality of different color parts 11,
15 can be molded at the same time, so that the number of steps and cost can be reduced as compared with the conventional molding method, and the appearance of the obtained skin becomes good.

Next, an example of the production of a foam molded article such as an instrument panel of an automobile using the different color plastic skin 10 will be described in connection with a case where a known skin integral foam molding method is used. As shown in FIG. 7, the different color plastic skin 1
0 is set, and the core material 61 and the like are set on the upper mold 55 and the mold surface 56 as necessary. Thereafter, a foaming material M such as urethane is injected into the inside of the skin 10 of the different color plastic by an appropriate method, and the foaming material M is foamed and hardened to form the foam 62 integrally with the skin 10, as shown in FIG. The foam molded article 60 is manufactured.

At the time of the integral foam molding of the skin, the skin 10
Since the different color portions 11 and 15 are integrally welded and joined by the boundary member 21, the outer skin 10 can be easily and quickly set on the lower mold 51 and the mold surface 52.
The inconvenience of joining the separated skin materials having different colors on the mold surface and the displacement of the skin material at that time are less likely to occur. Further, in the skin 10, since the different color portions 11, 15 are welded to the boundary member 21 and there is no gap between the different color portions 11, 15, the foaming raw material M leaks to the outside of the skin 10 to cause molding failure. Can be prevented. In the skin 10 of this example, the boundary member 21 is located on the back side of the skin 10 so that the skin 1
0 surface (design surface), and furthermore, each different color part 11, 1
Since the boundary groove 17 formed by the boundary member 5 and the boundary member 21 is pressed and closed by the foaming pressure at the time of the foam hardening, it is possible to obtain a good foam molded product without a sense of incongruity at the boundary between the different color portions 11 and 15. Can be. Needless to say, the application of the different-color plastic skin 10 is not limited to the above-described skin-integral foam molding.

In the invention of the skin and the invention of the molding method, the different color portions 11 and 15 may
Alternatively, instead of colors, different materials having different physical properties may be used. For example, the different color part 1 on one side of the boundary member 21
For example, 1 may be made of a material having excellent weather resistance, and the other-colored portion 15 on the other side may be made of a soft material having excellent feel.

[0031]

As shown and described above, according to the different color plastic skin of the invention disclosed herein, since a plurality of different color portions are integrated by the boundary member, the appearance is improved and the skin is improved. If it is used to mold a foam molded article by the integral foam molding method, it can be easily and quickly set in a molding die, and the foam material can be prevented from leaking out of the skin.

Further, according to the method of molding a different color plastic skin of the present invention disclosed herein, a plurality of different color portions are simultaneously molded and each of the different color portions is integrated, so that a conventional molding method of this kind of skin is used. As compared with the method, the number of steps and cost can be reduced, and the appearance of the obtained skin can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a different color plastic skin according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a main part thereof.

FIG. 3 is an enlarged cross-sectional view showing a main part of a different color plastic skin according to another embodiment.

FIG. 4 is a partial perspective view showing a part of a molding apparatus used for a method of molding a different color plastic skin according to an embodiment of the present invention.

FIG. 5 is a cross-sectional view showing the molding apparatus during rotation in an example of a method for molding a different-color plastic skin.

FIG. 6 is a cross-sectional view showing a state at the time of forming a plastic film in the molding method.

FIG. 7 is a cross-sectional view showing an example of manufacturing a foam molded product by integral skin foam molding using the different color plastic skin of FIG.

FIG. 8 is a cross-sectional view showing a foam molded product obtained by the production.

FIG. 9 is a cross-sectional view showing an example of a conventional different-color plastic skin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Different color plastic skin 11, 15 Different color part 11a, 15a Molten plastic film 12, 16 Edge of different color part 21 Boundary member 22, 23 Both ends of boundary member 30 Molding device 31 Bucket 35 Partition plate 36 Tip of partition plate 37, 38 Powder storage Part 41 Mold 42 Mold surface 46 Mold support projections P1, P2 Plastic powder

Claims (6)

[Claims] 1. A plastic skin in which different colored portions having different colors are formed on both sides of an elongated boundary member by powder slush molding, and the boundary member is welded to an edge of the different colored portion by heat during powder slush molding. Characterized by a unique plastic skin. 2. The plastic skin according to claim 1, wherein the boundary member has a substantially U-shaped cross section depressed to the back side of the skin, and both ends of the U-shape are welded to edges of a different color portion. 3. A combination of a bucket containing plastic powder and a mold having a mold surface,
At the time of rotation, the plastic powder in the bucket is moved to the heated mold surface of the mold to form a molten plastic film on the mold surface, and then the plastic bucket is molded by powder slush molding for cooling and curing. A partition plate is erected on the bottom surface of the partition plate, and a plurality of storage portions partitioned by the partition plate respectively contain plastic powders of different colors. When the bucket and the forming die are combined, the mold surface during powder slush molding is formed. An elongate plastic boundary member at least on both sides in the width direction that is melted by heat is sandwiched between the end of the partition plate and the mold surface to partition the bucket and the mold into a plurality of parts. When plastic powders of different colors are attached to the mold surfaces on both sides of the mold to form molten plastic films of different colors Melting the both side portions of the boundary member and joining them with a molten plastic film having a different color, and then obtaining a different color plastic skin having different color portions on both sides of the boundary member by cooling and hardening thereafter; Molding method. 4. The partition member according to claim 3, wherein a support member for a boundary member is erected at a position facing the front end of the partition plate on the mold surface, and the boundary member is sandwiched between the support protrusion and the front end of the partition plate. A method for molding a different color plastic skin, characterized in that: 5. The method according to claim 4, wherein the boundary member has a substantially U-shaped cross section.
A method for forming a different color plastic skin, wherein the skin is shaped like a letter and is detachably attached to a support projection. 6. The molding method of claim 5, wherein a boundary member having a substantially U-shaped cross section is fitted to a support projection with a gap provided between both ends in the width direction and a mold surface.