JPH0672258A - Molding and its manufacturing method - Google Patents

Abstract

(57) [Abstract] [Purpose] A resin main body can be satisfactorily joined to the surface of a metal cored bar, and a resin with desired characteristics can be used to prevent the occurrence of "sinks" on the surface of the main body. The main body can be formed to reduce the cost. A molding comprising a metal cored bar 5 and a resin main body 2 extruded so as to cover the surface of the cored bar 5, wherein the main body 2 is made of a desired synthetic resin. Therefore, inside the main body 2, there is provided a coupling body 6 that is joined to the surface of the core metal 5 and that couples the main body 2 and the core metal 5 so that they cannot move relative to each other. The combined body 6 is formed of a synthetic resin having excellent bonding reactivity with the surface of the core metal 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molding provided with a metal cored bar and a resin main body extruded so as to cover the surface of the cored bar, and a method for manufacturing the same.

[0002]

2. Description of the Related Art In this type of molding, an adhesive is applied to the surface of a metal cored bar in advance, and a resin body is extruded so as to cover the surface of the cored bar. There is a structure in which the main body is bonded to the surface of gold. However, the working environment may be deteriorated by the solvent generated by the adhesive applied to the surface of the cored bar.

In order to eliminate the deterioration of the working environment, for example, as disclosed in JP-A-58-92519, a large number of through holes are provided in a cored bar, and the through holes flow into the respective through holes. As shown in Japanese Utility Model Laid-Open No. 58-163337, which has a structure in which a metal core and a main body are joined by a resin portion formed by (3), it has excellent bondability to the surface of a metal metal core. It is known that a body made of an ionomer resin is extrusion-molded so as to cover the surface of the core metal.

[0004]

In the former case, not only is it necessary to dispose a large number of through holes in the core metal, but also the resin portion flowing into each through hole causes the main body to be damaged. There is a problem in that an uneven surface due to "sinks" is generated on the surface and the appearance is deteriorated. Further, the latter is costly because the main body is formed from an expensive ionomer resin, and the characteristics of the ionomer resin may not match the desired molding characteristics,
In this case, it cannot be used as a molding and its use is limited.

In view of the above-mentioned conventional problems, an object of the present invention is to make it possible to satisfactorily bond the main body to the surface of the cored bar, prevent the occurrence of "sink" on the surface of the main body, and make it desirable. It is an object of the present invention to provide a molding that can form a main body of a synthetic resin having characteristics and can reduce the cost, and a manufacturing method that can easily manufacture the molding.

[0006]

In order to achieve the above object, the molding of claim 1 of the present invention comprises a metal cored bar and a resin extruded so as to cover the surface of the cored bar. A molding with a body made of
The main body is made of a desired synthetic resin, and inside the main body, there is provided a coupling body that is joined to the surface of the cored bar and couples the main body and the cored bar so that they cannot move relative to each other. It is made of synthetic resin that has excellent bonding reactivity with the surface of gold.

According to a second aspect of the present invention, in the method for manufacturing a molding, a metal cored bar is extruded so as to cover the surface of the cored bar and is internally bonded to the surface of the cored bar. A method of manufacturing a molding including a main body provided with a joined body, the extrusion opening having a cross-sectional shape corresponding to the cross-sectional shape of the main body and opening on a front side surface of the die. At the same time as feeding the first material made of synthetic resin to form a main body in the main molding path having the above, the sub molding path communicating with the upstream side of the main molding path has a bonding reactivity with the surface of the core metal. A second material made of an excellent synthetic resin and a third material made of a resin having the same material or compatibility with the first material are alternately fed, and a core metal is introduced into the main molding path through the sub molding path. After feeding the A body formed so as to cover the first material and from it and the core metal third material,
A molding, which is made of the second material and is bonded to the surface of the core metal and is provided inside the main body, is extruded from the extrusion opening to manufacture a molding.

[0008]

In the molding according to claim 1, which is configured as described above, the combined body is firmly joined to the surface of the metal cored bar, and the main body and the cored bar are relatively immovably joined by the combined body. . Therefore, the main body can be formed of a desired synthetic resin material suitable for molding. Further, in the method for manufacturing a molding according to claim 2, in the sub-molding path, the bonded body is securely and firmly bonded to the surface of the core metal by the second material made of a synthetic resin having excellent bonding reactivity. While being formed, a part of the main body is formed by the third material. Subsequently, in the main molding path, the first synthetic resin of the desired
A molding is manufactured by forming the main body of the main body so as to cover the core metal with the material inside the bonded body and then extruding the main body from the extrusion frontage.

[0009]

【Example】

(Embodiment 1) The molding of Embodiment 1 of the present invention will be described with reference to FIGS. In FIG. 1, which is a perspective view of the molding, FIG. 2 which is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 which is a sectional view taken along the line III-III of FIG. Core metal 5
And a resin main body 2 extruded so as to cover the entire front and back surfaces of the core metal 5.

The main body 2 is made of a resin such as PP, ABS, PVC or the like, and is joined to the surface of the core metal 5 in the longitudinal direction inside the main body 2 so as to move the main body 2 and the core metal 5 relative to each other. A plurality of coupling bodies 6 that cannot be coupled to each other are provided at predetermined intervals in the longitudinal direction of the surface of the cored bar 5. The combined body 6 is an ionomer resin having excellent bonding reactivity with the surface of the core metal 5,
When the main body 2 is extrusion-molded, the combined body 6 is formed inside the main body 2 while being surely and firmly joined to the surface of the cored bar 5 when the main body 2 is extrusion-molded.

The molding 1 of the first embodiment is constructed as described above. Therefore, the cored bar 5 and the main body 2 are coupled so that they cannot move relative to each other by the combination body 6 that is firmly bonded to the surface of the cored bar 5. Therefore, the main body 2 is made of PP. ABS. It can be formed of a synthetic resin material such as PVC, and the material cost can be reduced as compared with a case where the entire main body 2 is formed of an expensive ionomer resin or ethylene copolymer resin.

Next, a die device for extruding the molding 1 of Example 1 will be described. First, referring to FIG. 4 which is a cross-sectional view of the die device and FIG. 5 which is a perspective view, the main body 2 of the molding 1 is provided on the front side of the die 11.
A main molding path 13 having a cross-sectional shape corresponding to the cross-sectional shape of No. 1 and having an extrusion opening 12 opening on the front side surface of the die 11 is formed.

Inside the die 11, a sub-molding path 14 communicating with the upstream side of the main molding path 13 and a core metal feeding path 15 communicating with the upstream side of the sub-molding path 14 are formed. The sub-molding path 14 is formed in a sectional shape corresponding to the sectional shape of the combined body 6.

In the die 11, a first material flow path 16 for guiding the first material P1 to the main molding path 13 and a second material flow path for guiding the second material P2 to the auxiliary molding path 14 are provided. 17
And a third material flow path 18 for guiding the third material P3 to the sub-molding path 14. Further, in the die 11, the sub-forming passage 14 and the second material passage 17 are provided.
And the switching shutter 20 between the third material flow path 18 and
Are assembled in the first and second switching positions so that the arrangement can be switched.

The switching shutter 20 is provided with first and second communication passages 21 and 22, respectively.
Then, as shown in FIGS. 6 to 9, the switching shutter 20 is
When the arrangement is switched to the first position, the second material flow path 17
Is communicated with the sub-forming passage 14 by the first communication passage 21, and the third material passage 18 is not communicated with the sub-forming passage 14,
The second communication passage 22 communicates with the second discharge passage 24.

Further, the switching shutter 20 is shown in FIGS.
When the arrangement is switched to the second position as shown in 3, the third
The material flow passage 18 is communicated with the sub molding passage 14 by the second communication passage 22, and the second material flow passage 17 is communicated with the first discharge passage 23 by the first communication passage 21 without being communicated with the sub molding passage 14. It has become so.

Next, a method of manufacturing the molding 1 according to the first embodiment will be described together with the description of the operation of the die device having the above-described structure. In the first material flow path 16 of the die 11,
A first material P made of synthetic resin such as PP, ABS, PVC for forming the main body 4 of the main body 2 of the molding 1.
1 is sent.

In the second material flow path 17, a second material P2 made of a synthetic resin having excellent bonding reactivity with the surface of the core metal 5 such as an ionomer resin or an ethylene copolymer resin for forming the combined body 6 is formed. Sent. Furthermore, the third material flow path 18
A third material P3, which is made of a resin having the same material as or compatibility with the first material P1 and which is used to form the part 3 of the main body 2, is sent to. Further, the cored bar 5 is fed to the cored bar feed path 15. The core metal 5 is guided to the main molding path 13 through the sub molding path 14.

As shown in FIGS. 5 to 8, the switching shutter 20
Is located at the first position, the second material P2 of the second material flow path 17 is the first material of the switching shutter 20.
It flows through the communication passage 21 to the auxiliary molding passage 14. Then, in the sub molding path 14, the combined body 6 made of the second material P2 is formed.
Are formed while being bonded to the surface of the cored bar 5.

After a predetermined time elapses after the switching shutter 20 is arranged at the first position, the switching shutter 20 is arranged at the second position as shown in FIGS. 10 to 13.
Then, the third material P3 of the third material flow path 18 flows to the sub molding path 14 via the second communication path 22 of the switching shutter 20.
Then, in the sub-molding path 14, a part 3 of the main body which is made of the third material P3 and has the same cross section as the combined body 6 and is continuous with the combined body 6 is formed.

In this way, the switching shutter 20 is switched in a predetermined synchronous manner, so that the core metal 5 in the auxiliary molding path 14 is switched.
The coupling bodies 6 and the part 3 of the main body are alternately formed in the longitudinal direction of the surface of the. Then, together with the core metal 5, the combined body 6 and the part 3 of the main body are sequentially guided to the main molding path 13.

On the other hand, the first material P1 of the first material channel 16
Flows into the main molding path 13 while the combined body 6 and the part 3 of the main body 3 are internally provided and covers the core metal 5, whereby the main body 4 of the main body 2 is formed in the same manner. The main body 4 and the part 3 of the main body are integrated to form the main body 2. Then, the main body 2, the combined body 6 and the cored bar 5 are extruded through the extrusion opening 12 to obtain a long molding 1 '.

After that, the long molding 1'is taken by a take-up device (not shown) arranged in front of the die 11 and then cut into a predetermined length, so that the molding 1 of the first embodiment is obtained. Become.

When the switching shutter 20 is located at the first position, the third material P3 in the third material flow passage 18 is in the second position of the switching shutter 20 as shown in FIG.
It is guided to the second discharge passage 24 through the communication passage 22 and discharged to the outside of the die 11. Further, when the switching shutter 20 is in the state of being arranged at the second position, the second material flow path 17
The second material P2 of the switching shutter 20 as shown in FIG.
Is guided to the first discharge passage 23 through the first communication passage 21 of the die 1
1 is discharged to the outside.

(Embodiment 2) Next, a molding 1 according to Embodiment 2 of the present invention will be described with reference to FIGS. In the second embodiment, the resin main body 2 is extrusion-molded so as to cover only the front surface side of the flat metal core 5 made of metal. Further, inside the main body 2, a plurality of coupling bodies 6 joined to the surface of the core metal 5 to immobilize the main body 2 and the core metal 5 in a relatively immovable manner are arranged at predetermined intervals in the longitudinal direction of the surface of the core metal 5. It is installed internally.

As shown in FIG. 16, the combined body 6 is formed in an inverted trapezoidal cross section having a long upper side and a short lower side, and the body 2 is lifted from the surface of the cored bar 5 based on the cross sectional shape. It is designed to prevent it. Also, the main body 2 is P
The joint body 6 is made of a synthetic resin suitable for molding such as P, ABS, PVC or the like, and the joint body 6 is made of an ionomer resin, an ethylene copolymer resin, or the like having excellent bonding reactivity with the surface of the core metal 5. Then, in substantially the same manner as in Example 1, when the main body 2 is extrusion-molded, the combined body 6 is formed inside the main body 2 while being securely and firmly joined to the surface of the cored bar 5.

(Third Embodiment) Next, a molding 1 according to a third embodiment of the present invention will be described with reference to FIGS. In the third embodiment, the resin main body 2 is extruded so as to cover the surface and both side surfaces of the metal cored bar 5 having a channel-shaped cross section.

Further, inside the main body 2, a plurality of coupling bodies 6 joined to the surface of the core metal 5 to immobilize the main body 2 and the core metal 5 in a relatively immovable manner are arranged in the longitudinal direction of the surface of the core metal 5. In addition to being provided at a predetermined interval, a connecting body 7 is provided so as to be integral with the connecting bodies 6 across the respective connecting bodies 6, and the connecting body 7 serves to connect the main body 2 to the surface of the core metal 5. It is designed to prevent lifting.

The main body 2 is made of a synthetic resin suitable for molding such as PP, ABS, PVC or the like, and the joint body 6 is made of an ionomer resin, an ethylene copolymer resin or the like having excellent bonding reactivity with the surface of the core metal 5. The connecting body 7 is made of the same resin as the joined body 6. Then, in substantially the same manner as in Example 1, when the main body 2 was extrusion-molded, the combined body 6 was formed inside the main body 2 while being joined to the surface of the core metal 5 and straddled over each combined body 6. The connected body 7 is formed.

[0030]

As described above, according to claim 1 of the present invention.
According to the molding described in (1), since the main body and the cored bar can be connected to each other so that they cannot move relative to each other by the combined body joined to the surface of the metal cored bar, a large number of through holes for connection are provided in the cored bar. The need can be eliminated and the occurrence of "sink" on the surface of the main body can be prevented. Further, the main body can be formed of a synthetic resin material suitable for molding, and the cost can be reduced as compared with the case where the entire main body is formed of an expensive ionomer resin alone, and the application of the molding is expanded. be able to. Also,
According to the method for manufacturing a molding of claim 2, the molding of claim 1 can be easily manufactured.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along line II-II in FIG.

3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a cross-sectional view showing a die device for extrusion molding of a molding.

FIG. 5 is a perspective view showing the same die device.

6 is a cross-sectional view taken along the line VV of FIG. 4 in a state where the switching shutter is arranged at the first position.

FIG. 7 is a sectional view taken along line VII-VII of FIG.

8 is a sectional view taken along line VIII-VIII of FIG.

9 is a sectional view taken along line IX-IX of FIG.

10 is a cross-sectional view taken along line XX of FIG. 4 in a state where the switching shutter is arranged at the second position.

11 is a sectional view taken along line XI-XI of FIG.

12 is a sectional view taken along line XII-XII of FIG.

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

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

15 is a sectional view taken along line XV-XV of FIG.

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

FIG. 17 is a perspective view showing a molding according to a third embodiment of the present invention.

18 is a sectional view taken along line XVIII-XVIII of FIG.

FIG. 19 is a sectional view taken along line XIX-XIX of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Molding 2 Main body 5 Core metal 6 Combined body 11 Die 12 Extrusion opening 13 Main molding path 14 Sub molding path 19 Shutter 20 Switching shutter

Claims (2)

[Claims] 1. A molding comprising a metal cored bar and a resin main body extruded so as to cover the surface of the cored bar, wherein the main body is made of a desired synthetic resin. A coupling body that is bonded to the surface of the core metal and that couples the body and the core metal in a relatively immovable manner is provided inside the main body, and the coupling body is easily bonded to the surface of the core metal. Molding made of synthetic resin. 2. A molding comprising a metal cored bar and a main body which is extruded so as to cover the surface of the cored bar and inside of which is provided a bonded body to be bonded to the surface of the cored bar. In the extrusion molding die, the main molding path having a cross-sectional shape corresponding to the cross-sectional shape of the main body and having an extrusion opening on the front side surface of the die is formed to form a main body. At the same time as feeding the first material made of resin, the second molding material communicating with the upstream side of the main molding path is made of a synthetic resin having excellent bonding reactivity to the surface of the core metal, and After alternately feeding one material and a third material made of the same material or a compatible resin, and feeding the core metal to the main molding path through the sub molding path, the core metal and the Made of one material and a third material and covering the core metal A molding body is manufactured by extruding the main body formed in this manner and a combined body made of the second material and bonded to the surface of the core bar and provided inside the main body from the extrusion opening. Characteristic molding method.