JPH06155542A - Molding having unevenness and its manufacture - Google Patents

Abstract

PURPOSE:To let the title molding have a solid feeling and durability, and contrive a reduction of a man-hour and a manufacturing cost, by a method wherein molding is effected of the first resin containing a foaming agent and the second resin not containing the foaming agent. CONSTITUTION:A molding 10 is constituted of the first resin part 12 comprised of the first resin containing a foaming agent and the second resin part 14 comprised of the second resin not containing the foaming agent. When the first resin and second resin are extruded through a discharge port of a molding device in a body, in a matter which has been in a sectional form copied after the discharge port, only capacity of the first resin is expanded by foaming operation. Consequently, unevenness such as a letter or a pattern appears on the surface of a molding 10. Then in the molding 10 wherein a core material 16 is molded, both of the first resin and second resin are extruded on one surface side and only one side out of the first resin and the second resin is extruded, the unevenness appears only on the one side of the core material 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding having irregularities such as letters and patterns on its surface and a method for manufacturing the same. Such moldings are used, for example, for molding side protectors of vehicles, ships, building materials, general machines, and the like.

[0002]

2. Description of the Related Art Taking a vehicle side protector as an example, it is widely practiced to decorate it with characters and patterns. Examples of means for adding letters, patterns, etc. include printing and painting. Moreover, in addition to the above, JP-A-60-176845
As described in Japanese Patent Publication, the core material is punched,
There is a method of integrally molding a resin so that irregularities such as characters and patterns are exposed on the surface.

[0003]

However, the means by printing and painting do not have a three-dimensional effect and lack durability. The means described in the above publication improves the three-dimensional effect and durability, but on the other hand, it is disadvantageous in terms of manufacturing man-hours and manufacturing costs because it is necessary to punch the core material in advance.

An object of the present invention is to provide a molding which has both a three-dimensional effect and durability and is advantageous in terms of manufacturing man-hours and manufacturing costs, and a manufacturing method thereof.

[0005]

According to the present invention, a first resin containing a foaming agent and a second resin containing no foaming agent are extruded so as to be integrated, and a second resin portion made of the second resin is formed. On the other hand, the volume of the first resin portion made of the first resin is enlarged by the foaming action of the foaming agent to form irregularities on the surface, and the first resin containing the foaming agent and the foam One resin of the second resin containing no agent is continuously extruded to the ejection port of the molding apparatus, and the other resin is integrated with the one resin at the ejection port while extruding the one resin. In order to solve the above-mentioned problems, a method for producing a molding having at least one surface having irregularities by the foaming action of the foaming agent is carried out.

The present invention also provides a molding in which unevenness is exposed only on one side of the molding by molding a core material. That is, according to the present invention, both of the first resin containing the foaming agent and the second resin not containing the foaming agent are extruded on one side surface of the core material, and one of the first resin and the second resin of the core material is extruded. It is extruded to the other side surface and the volume of the first resin portion made of the first resin is made larger than that of the second resin portion made of the second resin so that the unevenness appears on one side of the core material. Providing molding.

[0007]

When the first resin containing the foaming agent and the second resin containing no foaming agent are integrally extruded from the discharge port of the molding apparatus,
Immediately before being extruded from the ejection port, the cross-sectional shape following the ejection port is expanded, but only the first resin expands due to the foaming action of the foaming agent to expand the volume. As a result, irregularities such as characters and patterns appear on the surface of the molding by the amount of the volume expansion of the first resin.

Further, the core material is molded, and both the first resin and the second resin are formed on one side of the core material, and the first resin is formed on the other side of the first resin.
In the molding in which one of the resin and the second resin is extruded, unevenness appears only on one side of the core material. The side on which no unevenness is formed can be used as a fixing surface to a vehicle body or the like.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway perspective view of a first embodiment of a molding 10 according to the present invention. The molding 10 is a first resin made of a first resin containing a foaming agent.
And a second resin portion 14 made of a second resin containing no foaming agent. First resin and second
The resins may be of the same type or different types, but it is necessary to pay attention to compatibility when using different types of resins.

In the case of this embodiment, both the first and second resins are vinyl chloride and the foaming agent is azodicarbonamide. As another example of the foaming agent, a sulfohydrazide type one, for example, benzenesulfonyl hydrazide can be used.

The molding 10 has a cored bar 16 molded therein. Hereinafter, a process of manufacturing the molding 10 will be described.

2 and 3 show an example of a molding apparatus 20 used to manufacture the molding 10 according to the present invention. At least two molding devices 20
Any device capable of extruding different types of resins may be used. The device 20 comprises a fixed die 22 and a movable die 24. The first resin is fed from the two inlets 26, 28 to the device 2
It is sent within 0. The second resin is fed into the device through one inlet 30. The first resin sent from the inlet 26 is continuously extruded to the discharge port 32. With respect to the first resin sent from the inlet 28 and the second resin sent from the inlet 30, only one of the resins is extruded to the discharge port 32 by moving the movable die 24.

4 to 7 show the operating positions of the apparatus when the molding 10 is made of only the first resin. The first resin is fed into the fixed die 22 through the inlet 28. Then, through the movable die 24, the fixed die 22
To the discharge port 32. The second resin is fed into the fixed die 22 through the inlet 30. Then, it flows out from the discharge port 36 of the fixed die 22 through the movable die 24. Further, the first resin is fed into the fixed die 22 through the inlet 26 and then flows into the discharge port 32. Only the first resin flows into the discharge port 32. At the same time, the core metal 16 is fed in the longitudinal direction.

8 to 11 show the operating positions of the apparatus when the molding 10 is made of the first resin and the second resin. The first resin is fed into the fixed die 22 through the inlet 28. Then, it flows out from the discharge port 32 of the fixed die 22 through the movable die 24. The second resin is fed into the fixed die 22 through the inlet 30. Then, it flows through the movable die 24 to the discharge port 32 of the fixed die 22.
Further, the first resin is fed into the fixed die 22 through the inlet 26 and then flows into the discharge port 32. The first resin and the second resin flow into the ejection port 32. Core metal 1 at the same time
6 is sent in the longitudinal direction.

By moving the movable die 24,
Switching is made between the case where only the first resin flows into the discharge port 32 and the case where the first resin and the second resin flow into the discharge port 32. In this way, a portion including only the first resin portion 12 and a portion including both the first resin portion 12 and the second resin portion 14 can be formed.

When both the resin containing the foaming agent and the resin not containing the foaming agent are extruded from the discharge port 32, immediately after that, the resin containing the foaming agent expands and expands in volume by the foaming action. The resin containing no blowing agent maintains its volume. As a result, as shown in FIGS. 12 and 13, irregularities appear on the surface of the molding 10. Since the core metal 16 is molded, no unevenness appears on the back surface of the molding 10.

14 to 16 show a second embodiment of the molding according to the present invention. Reference numeral 13 is a first resin portion, and 15 is a second resin portion. The molding 11 of this embodiment uses a resin containing a foaming agent as the first resin and a resin containing no foaming agent as the second resin. Then, on one side of the cored bar 17, the first resin is molded with the second resin.

When the resin containing the foaming agent and the resin not containing the foaming agent are extruded from the discharge port 32, the resin containing the foaming agent expands and expands in volume by the foaming action. The resin containing no blowing agent maintains the volume as it is. As a result, as shown in FIGS. 15 and 16, the second resin portion 15 bulges in the portion where the first resin is extruded, and irregularities appear on the surface of the molding 10. Since the cored bar 16 is molded and the first and second resins are extruded on only one side surface thereof, no unevenness appears on the back surface of the molding 10.

In the above embodiments, in order to facilitate understanding of the invention, the unevenness is simply rectangular. However, in the above-exemplified device, characters or other patterns can be formed on the molding by changing the shape of the resin inflow path or the discharge port, or by appropriately controlling the movable die. You can

[0020]

According to the present invention, by molding a molding with a first resin containing a foaming agent and a second resin containing no foaming agent, the foaming action of the foaming agent causes irregularities to appear on the surface of the molding. Therefore, it is possible to obtain a molding that is excellent in three-dimensional effect and durability and that is economical.

Needless to say, the molded core material according to the second aspect is excellent in strength, and since the unevenness is formed only on one side surface of the molding, it can be easily mounted on the vehicle body or the like.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a first embodiment of a molding according to the present invention.

FIG. 2 is a perspective view of an entire apparatus for manufacturing a molding according to the present invention.

FIG. 3 is a front view of the device of FIG.

4 is a sectional view taken along line 4-4 of the molding apparatus of FIG. 3 when the movable die is moved to a position where only the first resin portion is molded.

5 is a sectional view taken along line 5-5 of the molding apparatus of FIG. 3 when the movable die is moved to a position where only the first resin portion is molded.

FIG. 6 is a sectional view taken along line 6-6 of the molding apparatus of FIG. 3 when the movable die is moved to a position where only the first resin portion is molded.

7 is a sectional view taken along line 7-7 of the molding apparatus of FIG. 3 when the movable die is moved to a position where only the first resin portion is molded.

8 is a sectional view taken along line 8-8 of the molding apparatus of FIG. 3 when the movable die is moved to a position where it is integrally molded with the first resin portion and the second resin portion.

9 is a sectional view taken along line 9-9 of the molding apparatus of FIG. 3 when the movable die is moved to a position where it is integrally molded with the first resin portion and the second resin portion.

10 is a sectional view taken along the line 10-10 of the molding apparatus of FIG. 3 when the movable die is moved to a position where it is integrally molded with the first resin portion and the second resin portion.

11 is a sectional view taken along line 11-11 of the molding apparatus of FIG. 3 when the movable die is moved to a position where it is integrally molded with the first resin portion and the second resin portion.

FIG. 12 is a longitudinal sectional view of a molding extruded from a discharge port.

13 is a sectional view taken along line 13-13 of FIG.

FIG. 14 is a partially cutaway perspective view of a second embodiment of the molding according to the present invention.

FIG. 15 is a longitudinal sectional view of a molding extruded from a discharge port.

16 is a sectional view taken along line 16-16 of FIG.

[Explanation of symbols]

 10, 11 Molding 12, 13 First resin part 14, 15 Second resin part 16, 17 Core metal 20 Device 22 Fixed die 24 Movable die 26, 28, 30 Inlet 32 Discharge port

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location B32B 27/06 7258-4F B60R 13/04 A // B29K 105: 04 B29L 9:00 4F

Claims (3)

[Claims] 1. A first resin containing a foaming agent and a second resin containing no foaming agent are extruded so as to be integrated, and a second resin portion made of the second resin is extruded from the first resin. Become the first
The molding is characterized in that the volume of the resin portion of (1) is enlarged by the foaming action of the foaming agent so that irregularities are exposed on the surface. 2. Both a first resin containing a foaming agent and a second resin containing no foaming agent are extruded onto one side surface of the core material, and one of the first resin and the second resin is extruded from the core material. One side is extruded, and the first resin is applied to the second resin portion made of the second resin.
The molding is characterized in that the volume of the first resin portion made of the above resin is increased by the foaming action of the foaming agent so that irregularities are exposed on one side of the core material. 3. One resin of a first resin containing a foaming agent and a second resin containing no foaming agent is continuously extruded into a discharge port of a molding apparatus, and while the one resin is extruded, A method of manufacturing a molding having at least one surface having unevenness by extruding the other resin so as to be integrated with the one resin at the discharge port and by the foaming action of the foaming agent.