JP2977997B2 - Molding and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a long molding for decoration and a method of manufacturing the same.

[0002]

2. Description of the Related Art Various elongate moldings are mounted on ships, vehicles, building materials, and other general equipment for decoration. For example, a side molding or a bumper molding for decoration is mounted on a side portion or a bumper portion of an automobile body panel. Each of these moldings is generally made of a resin material extruded through a die of an extrusion molding device, and after a predetermined resin material is extruded to a predetermined length from an extrusion port provided in the die,
It is cut to a fixed size.

[0003] An end piece for improving the design is often attached to a terminal portion of a molding cut to a fixed length. Proposed. For example, in Japanese Unexamined Patent Publication No. 57-56214, the terminal portion of the molding is stretched to be plastically deformed, and thereafter the cutting is performed. In Japanese Unexamined Patent Publication (Kokai) No. 58-108110, after molding such that the cross-sectional shape of the molding is different in the longitudinal direction, melting is performed by high-frequency heating to obtain uniform surface properties. Further, JP-A-58-
Japanese Patent Publication No. 108110 proposes a method in which a terminal portion of a molding is cut, and then a heat-molding die is applied to the terminal portion to be melted to perform a terminal treatment.

[0004] On the other hand, among such various types of moldings, there are those formed of a two-layer molded product including an inner layer and a surface layer. In the molding composed of the two-layer molded product, the inner layer is molded separately from the surface layer exhibiting the design property of the molding, so that the simple terminal treatment as described above cannot be applied immediately .

An improved proposal for performing a molding terminal treatment using a foam material for the inner layer is disclosed in Japanese Patent Application Laid-Open No. 60-157583.
No. 7 proposes this. In the molding according to this proposal, first, a foamed layer (inner layer) containing a conductive substance is formed by:
It is extruded together with the non-foamed layer (outer layer) in an intermediate foamed state and cut to a fixed size. Next, the cut molding material is subjected to high-frequency heating in the cavity mold to expand the foam layer (inner layer), thereby processing the end portion. When the high-frequency heating is performed, the conductive material is heated by induction heating, whereby the foam molding of the foam layer (inner layer) is promoted.

[0006]

However, in the terminal treatment method for molding according to the above proposal, the foaming rate of the inner layer is higher than the speed at which the surface layer covers the cavity mold, or the foaming rate of the inner layer is extremely large. In, the inner foam layer may be exposed on the surface of the terminal portion,
There is a possibility that the design is impaired.

[0007] The present invention may be a mode <br/> Rudingu composed of two layers molded article, it is possible to apply a simple terminal processing method, moreover it has to be able to obtain a good design shape An object of the present invention is to provide a molding and a manufacturing method thereof.

[0008]

Means for Solving the Problems To achieve the above object, a molding according to the present invention comprises an inner layer made of a predetermined resin material, and a surface layer made of a predetermined resin material covering an outer surface of the inner layer, In a molding in which the entire length from the general portion to the terminal portion is extruded in a series, the surface layer is made of a resin material of the same material over the entire length from the general portion to the terminal portion, and the inner layer is
The general portion is made of a resin material different from the resin material forming the surface layer, and the terminal portion is made of the same resin material as the resin material forming the surface layer.

In the method of manufacturing a molding according to the present invention, resin materials respectively corresponding to an inner layer and a surface layer of the molding are simultaneously extruded from an extrusion opening provided in a die. In the molding manufacturing method in which the entire length of the molding is extruded in a series, the surface layer of the molding is extruded with the same material resin over the entire length from the general part to the terminal, and the inner layer of the molding is extruded. In doing so, for the part corresponding to the general part, the inner layer is extruded with a resin material different from the resin material constituting the surface layer, and for the part corresponding to the terminal part, the surface layer is formed. The inner layer is extruded from the same resin material as the resin material to be extruded.

[0010]

According to the means having such a configuration, the inner layer and the surface layer are formed of the same resin material in the terminal portion where the cutting is performed, so that the terminal treatment is easy and good by the usual means. Is to be performed.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. First, a molding 1 in the embodiment shown in FIG. 1 includes a long general portion 1a extruded linearly and a terminal portion 1b constituting an end of the general portion 1a.
It is composed of From the general section 1a to the terminal section 1b
Are extruded in a series and integrally as described later.

The general section 1a and the terminal section 1b are connected to the inner layer 1
The inner layer 11 is made of a solid resin material, and the surface layer 12 is formed on the outer surface of the inner layer 11 (the upper surface and both side surfaces in the figure).
Is formed from a thin layered resin material that covers the substrate. The inner layer 11 and the surface layer 12 have a substantially C-shaped cross section that is substantially constant over the entire length of the molding 1.
The surface layer 12 is formed of the same resin material P1 over the entire length from the general portion 1a to the terminal portion 1b, and the resin material forming the inner layer 11 is formed of a material P2 from the general portion 1a to the terminal portion 1b. It has been replaced by P1.

That is, first, in the general portion 1a, the surface layer 12 is made of a resin material P1, and the inner layer 11 is made of a resin material P2 different from the resin material P1 constituting the surface layer 12. It is configured. In the terminal portion 1b, the surface layer 12 is made of the same resin material P1 as the general portion 1a, and the inner layer 11 is made of the same material as the resin material P1 forming the surface layer 12. It is composed of a resin material P1.

An apparatus for molding such a molding 1 will now be described. The above-mentioned resin materials P1, P2
Is a die (extrusion mold) as shown in FIG.
2 and extruded through the die 2 into the cross-sectional shape as described above. The die 2 includes a first die 21 held in a fixed state, and a second die 22 attached to the first die 21 so as to be able to move in parallel with the first die 21. Extrusion port 21
The configuration is such that the material of the extruded resin material discharged from 1 is switched by the parallel movement of the second die 22.

That is, as shown in FIGS. 2 and 3 to 6, the first die 21 is provided with an extrusion port 21.
1 is formed so as to open to the front end face side, and is continuous with one inner layer extrusion channel 212 and two surface layer extrusion channels 213, 2
13 extend. The inner layer extrusion channel 212 is open at the center of the extrusion molding port 211, and the two surface layer extrusion channels 213 and 213 are arranged on both sides of the inner layer extrusion channel 212, respectively. The extrusion opening 211 is open at the outer peripheral portion. One of the two surface layer extrusion channels 213 and 213 is connected to the first die 21.
It extends so as to bend toward the side of
A supply source of a resin material P1, not shown, is connected to the external opening. Also, the surface layer extrusion flow path 2 on the other side
13 is a surface layer extrusion channel 2 connected to the supply source.
13, the inner layer extrusion flow path 2
After extending to straddle 12, it extends to the extrusion opening 211.

On the other hand, on the base side of the inner layer extrusion flow path 212, a reservoir 214 composed of a cavity of a predetermined size is provided.
The second die 22 is mounted so as to be able to reciprocate in a horizontal direction orthogonal to the pushing direction so as to face the reservoir 214 . The second die 22 is provided with a pair of switching channels 221 and 221 that extend substantially parallel to the extrusion direction. One of the pair of switching channels 221 and 221 is configured to be selectively opened to the cavity of the reservoir 214 in the first die 21,
The reciprocating parallel movement of the die 22 causes the switching flow paths 221 and 22
1 is performed.

Further, the first die 21 has a pair of material supply passages 215 and 215 and a pair of material discharge passages 21.
6, 216 are the switching channels 221 and 2 of the second die 22.
It is arranged so as to face up and down with 21 interposed. Among them, the material supply flow paths 215 and 215
Tabs 215a and 215a are provided to be always open to the two switching channels 221 and 221. A resin material P1 is supplied from one side of the pair of material supply channels 215 and 215, and a resin material P2 of a material different from the resin material P1 is supplied from the other side of the material supply channel 215. Have been sent. On the other hand, material discharge channels 216, 21
Numerals 6 are arranged so as to be selectively opened to the respective switching channels 221 and 221 of the second die 22, and are respectively opened to the bottom surface of the first die 21.

First, the general part 1a of the molding 1
In the case of molding the first die 21, the first die 21 and the second die 22 are set in the positional relationship shown in FIGS. Thereby, the switching channel 22 provided in the second die 22
The switching flow path 221 on the side (the left side in the drawing) that is in communication with the material supply flow path 215 that feeds the resin material P <b> 2 is opened to the reservoir 214 side of the first die 21. . On the other hand, the material supply flow path 2 for feeding the resin material P1
The switching flow path 221 on the side (the right side in the figure) that is in communication with the communication path 15
Is closed from the reservoir 214 and communicates with one side of the material discharge channel 216.

Thus, as shown by the arrow in the figure, the material supply flow path 215 on one side (left side in the figure) of the first die 21 to the switching flow path 221 on one side (left side in the figure) of the second die 22. Only the resin material P2 fed to the first die 2
It is extruded from the central portion of the extrusion port 211 through one inner layer extrusion channel 212. And molding 1
Is formed of the resin material P2. Further, at this time, the resin material P1 is constantly supplied to the surface layer extrusion channels 213 and 213 of the first die 21, and the resin material P1 is supplied to the extrusion molding port 211 through the surface layer extrusion channels 213 and 213. It is pushed out from the outer circumference side. Thus, the surface layer 12 of the molding 1 is formed from the resin material P1.

At this time, the resin material P fed from the material supply flow path 215 on the other side (right side in the drawing) of the first die 21 to the switching flow path 221 on the other side (right side in the drawing) of the second die 22 is used.
1 is discharged to the outside through the material discharge channel 216 without flowing into the reservoir 214.

Next, when molding the terminal portion 1b, the first
The die 21 and the second die 22 are switched and set to the positional relationships shown in FIGS. This more second
Of the switching channels 221 and 221 provided in the die 22,
The switching flow path 221 on the side (the right side in the drawing) that is in communication with the material supply flow path 215 that supplies the resin material P1 is opened to the reservoir 214 side of the first die 21. On the other hand, the switching flow path 221 on the side (left side in the drawing) that is in communication with the material supply flow path 215 that feeds the resin material P2 is separated from the reservoir 214 and is closed, and the material discharge flow path 2
16 to the other side.

Thus, as indicated by the arrow in the drawing, the material supply flow path 215 on the other side (right side in the figure) of the first die 21 is switched to the switching flow path 221 on the other side (right side in the figure) of the second die 22. Only the resin material P1 fed to the first die 2
It is extruded from the central portion of the extrusion port 211 through one inner layer extrusion channel 212. And molding 1
Is formed of the resin material P1. At this time, the resin material P1 is also constantly supplied to the surface layer extrusion channels 213 and 213 of the first die 21, and the resin material P1 is supplied to the extrusion molding port 211 through the surface layer extrusion channels 213 and 213. It is extruded from the outer peripheral side, whereby the surface layer 12 of the molding 1 is molded from the resin material P1.

At this time, the resin material P supplied from the material supply flow path 215 on the other side (left side in the drawing) of the first die 21 to the switching flow path 221 on the other side (left side in the drawing) of the second die 22.
2 is discharged outside through the material discharge channel 216 without flowing into the reservoir 214.

When the molding 1 is actually formed, as shown in FIG. 11, first, the general portion 1a is formed over a predetermined length, and then two ends (1b, 1b) of the terminal portion 1b are formed. Then, the general portion 1a is formed again over a predetermined length. As described above, the surface layer 12 is extrusion-molded with a constant thickness and a constant cross-sectional shape over the entire length of the molding 1.
At the boundary between b and the general portion 1a, the material is switched from the resin material P1 to the resin material P2.

After such extrusion molding, FIG. 12 and FIG.
As shown in the figure, the two terminals 1b, 1b
Is cut at approximately the center of the. In the terminal portion 1b where this cutting is performed, the terminal treatment is easily performed because the inner layer 11 and the surface layer 12 are made of the same resin material P1. That is, in the terminal unit 1b of the molding 1 according to the present embodiment, the relatively simple terminal processing as described in the section of the related art can be applied, and therefore, the terminal unit having good designability. Can be easily obtained.

Next, the molding 3 in the embodiment shown in FIG. 14 has a long general portion 3a which has a substantially C-shaped cross section and is extruded linearly, and this general portion 3a.
and a terminal 3b which constitutes an end of a.
The part from the general part 3a to the terminal part 3b is extruded in a series and integrally. The surface layer 32 constituting the molding 3 is formed so as to surround the entire inner layer 31 unlike the first embodiment described above. And this surface layer 3
2 is made of the same resin material P1 over the entire length of the molding 3, and has a constant thickness over the entire length;
It is extruded with a constant cross-sectional shape. On the other hand, the inner layer 31 is, in the general portion 3a, the surface layer 3
2 is different from the resin material P1 of the resin material P1.
2 and the terminal portion 1b is made of the same resin material P1 as the resin material P1 forming the surface layer 32. In the second embodiment, the same operation and effect as those of the first embodiment can be obtained.

Further, the molding 4 in the embodiment shown in FIG. 15 has a long general portion 4a which has a substantially C-shaped cross section and is extruded linearly and an end portion of the general portion 4a. And the terminal portion 4b is formed, and from the general portion 4a to the terminal portion 4b, they are integrally formed by extrusion molding. The surface layer 42 constituting the molding 4 is formed so as to cover the outer surface (the upper surface and both side surfaces in the drawing) of the inner layer 41 and the width direction of the surface layer 42, as in the first embodiment described above. , A substantially semicircular decorative portion 43 is provided at a substantially central portion thereof.

Here, the surface layer 42 and the decorative portion 43 are
The entire length of the molding 4 is made of the same resin material P1 and the same resin material P3, and is extruded with a constant cross-sectional shape over the entire length. On the other hand, the inner layer 41 is formed of the resin material P in the general portion 4a.
The terminal portion 4b is made of the same resin material P1 as the resin material P1 forming the surface layer 42, while being made of a resin material P2 different from P1 and P3. In the third embodiment, the same operation and effect as those in the first and second embodiments can be obtained.

[0029]

As described above, according to the present invention, the inner layer and the surface layer in the general section are made of resin materials of different materials, and the inner layer and the inner layer are cut out after being extruded over a predetermined length. Since the surface layer and the resin material are made of the same material, the terminal treatment can be easily performed by a relatively simple processing method, and a molding having a good design property can be obtained.

[Brief description of the drawings]

FIG. 1 is an external perspective explanatory view of a molding in one embodiment of the present invention.

FIG. 2 is an external perspective view showing a molding extrusion molding device (die) used in FIG.

FIG. 3 is a horizontal sectional view taken along line AA in FIG. 2;

FIG. 4 is a horizontal sectional view taken along line BB in FIG. 2;

FIG. 5 is a transverse sectional view taken along the line CC in FIG. 4;

FIG. 6 is a transverse sectional view taken along the line DD in FIG. 4;

FIG. 7 is a cross-sectional view showing a moving state of the extrusion molding apparatus shown in FIG.

FIG. 8 is a cross-sectional view showing a moving state of the extrusion molding apparatus shown in FIG.

FIG. 9 is a cross-sectional view showing a moving state of the extrusion molding apparatus shown in FIG.

FIG. 10 is a cross-sectional view showing a moving state of the extrusion molding apparatus shown in FIG.

11 is an external perspective explanatory view showing a state before cutting in which the molding shown in FIG. 1 is actually extruded;

FIG. 12 is an external perspective explanatory view showing a state in which the molding shown in FIG. 11 is cut at a terminal unit.

FIG. 13 is a transverse sectional view taken along the line EE in FIG. 12;

FIG. 14 is an external perspective view showing a molding in another embodiment of the present invention.

FIG. 15 is an external perspective explanatory view showing a molding in still another embodiment of the present invention.

[Explanation of symbols]

 1,3,4 Molding 1a, 3a, 4a General part 1b, 3b, 4b Terminal part 11,31,41 Inner layer 12,32,42 Surface layer P1, P2, P3 Resin material 2 Die 21 First die 22 Second die 211 Extrusion molding port 212 Inner layer extrusion channel 213 Surface layer extrusion channel 215 Material supply channel 216 Material discharge channel 221 Switching channel

Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B29C 47/06

Claims (2)

(57) [Claims] An inner layer made of a predetermined resin material, and a surface layer made of a predetermined resin material covering an outer surface of the inner layer;
In a molding in which the entire length from the general portion to the terminal portion is extruded in a series, the surface layer is made of a resin material of the same material over the entire length from the general portion to the terminal portion, and the inner layer is a general portion. , Characterized in that the molding is made of a resin material different from the resin material constituting the surface layer, and the terminal portion is made of the same material as the resin material constituting the surface layer. 2. A resin material corresponding to each of an inner layer and a surface layer of a molding is simultaneously extruded from an extrusion molding port provided in a die, and a total length from a general portion of the molding to a terminal portion is extruded in a series. In the method of manufacturing a molding, the surface layer of the molding is extruded with the same material resin over the entire length from the general portion to the terminal portion, and when the inner layer of the molding is extruded, a portion corresponding to the general portion is formed. In addition, the inner layer is extruded with a resin material different from the resin material constituting the surface layer, and the resin material of the same material as the resin material constituting the surface layer is applied to the portion corresponding to the terminal portion Wherein the inner layer is extruded by the following method.