JPH1016038A - Device for manufacturing molded piece with skin and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To manufacture a molded piece formed integrally with a skin using an extrusion blow molding method. SOLUTION: A skin fixture 16 is provided between an extrusion molding machine for extruding a parison P and molds 12, 13. In addition, the skin fixture 16 is equipped with a plurality of bending joint parts 17a and an arm part 17 with a plurality of grips 17b for supporting a skin 18 by suspension. Further, the skin 18 is wound around the outer periphery of the extruded parson P with the help of the skin fixture 16 and the molds 12, 13, are closed. A gas is introduced into the parison P to form a molded piece with the skin 18 adhering to the entire area from the front face to part of the back face. After taking the molded piece out of the molds 12, 13, the terminals of the skin 18 need not be trimmed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for producing a molded article having a skin in which a skin is adhered to the outer surface of a preform.

[0002]

2. Description of the Related Art Conventionally, after a cylindrical parison is extruded between a pair of molds, the mold is closed, the parison is sandwiched, and gas is blown into the parison to blow the mold. A method of manufacturing a molded article by so-called extrusion blow molding, in which a hollow molded article is pressed against a cavity surface of the molded article, is used. In such extrusion blow molding, there is known a method of manufacturing a molded article integrally provided with a skin by previously disposing a skin on a cavity surface of one mold.

However, in the above-mentioned conventional method, for example, as shown in FIG. 8A, the skin 3 is brought into close contact with one side of the mold parting line PL, that is, the front side 2a of the molded product 2. Although it is possible, after the mold is opened, the terminal 3a of the skin 3 is cut, or the terminal 3a of the skin 3 is wound in the direction of the arrow in the figure, and as shown in FIG. Post-processing is required to be wound around and adhered to the side 2b. The method of cutting the terminal 3a of the skin 3 has a problem that it is difficult to improve the appearance and that the skin 3 is easily peeled off from the terminal 3a. On the other hand, the method in which the terminal 3a of the skin 3 is rolled and bonded has problems that the number of processing steps such as application of an adhesive increases and that the bonding operation takes time.

In this respect, for example, Japanese Patent Application Laid-Open No. 3-290227
Is known. This configuration,
As shown in FIG. 9, one of the molds is provided with a movable middle mold to form an undercut portion 5, and by cutting off the undercut portion 5, the terminal 3a of the epidermis 3 from the front side 2a.
There is known a configuration in which a molded article 2 is formed in a state in which is not visible. However, in the configuration described in this publication, the structure of the mold is complicated, the manufacturing cost is increased, and when the undercut portion 5 is provided in the blow molding, the thickness tends to be uneven, and particularly, the thickness near the undercut portion 5 is increased. There is a problem that the wall thickness tends to be small.

[0005]

As described above, the method of cutting the terminal of the skin after opening the mold has a problem that it is difficult to improve the appearance and that the skin is easily peeled off from the terminal. I have. On the other hand, the method in which the terminal of the skin is rolled up and bonded has problems that the number of processing steps such as application of an adhesive increases and that the bonding operation takes time. Furthermore, in a configuration in which an undercut portion is formed on a molded product and cut, the structure of the mold is complicated, and the manufacturing cost is increased. There is a problem that the thickness in the vicinity of the cut portion tends to be small.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an apparatus and a method for manufacturing a molded article having a skin which can be easily manufactured and has a good appearance.

[0007]

According to a first aspect of the present invention, there is provided an apparatus for manufacturing a molded article having a skin, comprising: a preformed body manufacturing apparatus for forming a cylindrical preformed body; A skin jig for arranging the skin, a pair of molds provided with cavity surfaces facing each other with the preformed body and the skin interposed therebetween, and a blow device for flowing a fluid into the inside of the preformed body. It was done.

[0008] In this configuration, a cylindrical preform is formed by the preform manufacturing apparatus, and the mold is placed in a state where the skin is arranged along the outer peripheral surface of the preform by a skin jig. Close and let the fluid flow inside the preform by means of a blower. Then, the preform expands, is pressed against the cavity surface of the mold via the skin, and is formed into a predetermined shape with the skin closely contacting the outer peripheral surface. At this time, since the skin is arranged along the outer peripheral surface of the preform by the skin jig, the skin can be adhered from the front surface side to the rear surface side of the outer peripheral surface of the molded product.

According to a second aspect of the present invention, there is provided a method for producing a molded article having a skin, comprising forming a cylindrical preformed body, arranging a skin along the outer peripheral surface of the preformed body, and forming the preformed body and the skin. It is sandwiched by a mold and the preform is expanded in the mold.

[0010] In this configuration, since the preform is expanded in the mold while the outer skin is arranged along the outer peripheral surface of the preform, the outer skin extends from the front surface side to the rear surface side of the outer peripheral surface of the molded product. It becomes possible to adhere.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a manufacturing apparatus for a molded article having a skin according to an embodiment of the present invention;

In FIG. 1, reference numeral 11 denotes a manufacturing apparatus. This manufacturing apparatus 11 is an extruder (die) (not shown) as a preform manufacturing apparatus for forming a cylindrical parison P as a cylindrical preform. And a mold device 14 having a pair of molds 12 and 13 provided below and opposed to each other at the extruder. Opposite cavity surfaces 12a, 13a are formed in these molds 12, 13, and are moved in a substantially horizontal direction below the extruder to close and open the mold. Further, a blow device (not shown) for connecting a gas to the parison P in the mold device 14 by connecting to one of the molds 12 or 13 is provided, and so-called extrusion blow molding is performed. ing.

A skin jig 16 is provided between a lower portion of the extruder and an upper portion of the mold device 14. And
The jig 16 for skin includes a plurality of bendable joints 17a,
Arm portion 17 having a plurality of clips 17b serving as support portions for suspending and supporting a skin (insert skin) 18 such as cloth.
Each joint 17a is bent by a driving device (not shown) to bend (deform) into a substantially C-shape whose center is located at the center of the cavity of the closed mold device 14 and at least the mold 12 , 13 in the opening and closing directions.

As shown in FIG. 2, the manufacturing apparatus 11 forms an integral part of the outer skin 18 from the front side B of the outer peripheral surface A of the resin base 21 to a part of the rear side D via both sides C. A molded product 22 that is integrally adhered is formed.

Next, with reference to FIG. 1 to FIG. 6, a process of manufacturing the molded article 22 using the manufacturing apparatus 11 will be described. In the following description, the parison P also corresponds to the outer surface A, the front surface B, the both surfaces C, and the rear surface D of the molded product 22. It will be described as the side.

First, in the initial state, as shown in FIG. 3, the mold apparatus 14 is opened, and the molds 12 and 13 are separated from each other about the position where the parison P below the extruder hangs. . Then, the width of the front side B of the molded article 22 and the width of both sides C
A skin 18 cut slightly longer than the dimension obtained by adding the width of the skin 18 is prepared, and is held and supported by being clipped by the clip 17b of the jig 16 for the skin. Further, the arm 17 of the jig 16 for the skin is
The outer surface side of 18 is directed toward one mold 12, and is bent in a substantially U shape toward this one mold 12 side, or curved so as to gently swell, and further, a parison P It is moved to the vicinity of one of the molds 12 as necessary so that the skin 18 does not come into contact with the mold. In this state, the extruder is driven to extrude (inject) the resin, and the parison P is hung down.

Subsequently, when the arm 17 of the skin jig 16 has been retracted, the arm 18 is moved so as to return to a predetermined position, and as shown in FIGS. The arm 17 is bent in a substantially C shape so as to wrap (wrap) the outer peripheral surface of the parison P. At this time, the skin 18 wraps around half or more of the outer peripheral surface of the parison P in the circumferential direction.
Wrap with or without parison P.

Thereafter, as shown in FIG. 5, the mold device 14 is closed, the upper and lower sides of the parison P are cut, and the cavities forming the molded product 22 are formed by the cavity surfaces 12a, 13a of the dies 12, 13. I do. In this state, since the skin 18 is wound around the back side of the parison P, the parison P and the skin 18 are not sandwiched between the parting lines PL of the molds 12 and 13, and the terminal of the skin 18 is located on the back side of the parison P. Touch

Next, a compressed gas is fed at a predetermined pressure into the inside of the parison P in the cavity of the mold apparatus 14, and blow-up is performed. Then, as shown in FIG. 6, the parison P and the skin 18 are connected to the cavity surfaces 12a, 13a of the molds 12, 13.
Are formed in a predetermined hollow shape in a state where they are integrated with each other in close contact with each other.

Then, by opening the mold apparatus 14 in a state in which the parison P is solidified, as shown in FIG. A hollow molded product 22 in which the skin 18 is integrally or integrally adhered to a part of the molded product is taken out.

As described above, according to the present embodiment, the epidermis
Since the skin jig 16 that can bend or bend along the parison P is used, the end of the skin 18 is integrally adhered to the back side D of the molded product 22 by extrusion blow molding, and the skin is A good-looking high-quality molded product 22 in which the 18 terminals are not visible can be easily formed. That is, in the present embodiment, the appearance can be improved as compared with the case where the terminal of the skin 18 is not involved in the back side D, and
Can be hardly peeled off. Further, there is no need for post-processing such as winding or cutting of the terminal of the skin 18, so that the number of steps can be reduced and the manufacturing cost can be reduced. Furthermore, compared to a configuration in which an undercut portion is formed in a resin by processing a mold, the thickness of the resin portion of the molded product 22 can be easily controlled, and the thickness and uneven thickness can be suppressed. In addition, it is not necessary to modify the mold, and the manufacturing cost can be reduced.

In the above embodiment, the jig for skin is used.
16 has a configuration including the arm portion 17 including a plurality of bendable joint portions 17a and a plurality of clips 17b serving as support portions for suspending and supporting the epidermis 18, but a configuration for supporting the epidermis 18, Various configurations can be adopted for the arrangement of the skin 18 along the outer peripheral surface of the parison P. For example, as in a skin jig 31 shown in FIG. 7, an elastic body may be used to form an elastically deformable arm portion 32 having a rectangular cross section in section. In this configuration, one end 33a is fixed, and the wire 33 inserted inside the arm 32 through the open ends 32a, 32a of the arm 32 is pushed and pulled in a predetermined direction (the direction of arrow F in the figure). The arm 32 can be bent and opened and closed so as to change the diameter (in the direction of arrow G in the figure). Also,
In this configuration, the skin 18 can be detachably supported by an adhesive material attached to the inner peripheral surface 32b of the arm 32 instead of the clip 17b.

[0023]

According to the apparatus for manufacturing a molded article having a skin according to the first aspect, the mold is closed and the blowing device is arranged because the skin is arranged along the outer peripheral surface of the preform by the skin jig. By flowing the fluid into the inside of the preform, the skin can be adhered from the front side to the rear side of the outer peripheral surface of the molded product. Therefore, the terminal of the skin can be disposed in close contact with the back side of the molded product without the need to wind or cut the terminal of the skin after removing the molded product from the mold, so that the appearance can be improved and the production can be facilitated. Manufacturing costs can be reduced.

According to the method for producing a molded article having a skin according to the second aspect, the preform is expanded in a mold while the skin is arranged along the outer peripheral surface of the preform, whereby the skin is formed. The molded article can be in close contact from the front side to the back side of the outer peripheral surface. Therefore, the terminal of the skin can be disposed in close contact with the back side of the molded product without the need to wind or cut the terminal of the skin after removing the molded product from the mold, so that the appearance can be improved and the production can be facilitated. Manufacturing costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of an apparatus for producing a molded article having a skin according to the present invention.

FIG. 2 is a cross-sectional view of the molded article.

FIG. 3 is a process chart showing a manufacturing process of the same. (A) is a plan view (b) is a side view

FIG. 4 is a process drawing showing a manufacturing process following FIG. 3; (A) is a plan view (b) is a side view

FIG. 5 is a process drawing showing a manufacturing process following FIG. 4; (A) is a plan view (b) is a side view

FIG. 6 is a process chart showing a manufacturing process following FIG. 5; (A) is a cross-sectional view (b) is a side view

FIG. 7 is a perspective view of a jig for skin showing another embodiment of the present invention.

FIG. 8 is an explanatory view showing an example of a conventional molded product. (A) is a sectional view showing a manufacturing process. (B) is a sectional view showing a step following (a).

FIG. 9 is a sectional view showing another example of a conventional molded product.

[Explanation of symbols]

 11 Manufacturing equipment 12,13 Mold 12a, 13a Cavity surface 16,31 Skin jig 18 Skin A Outer surface P Parison as preform

Claims (2)

[Claims] 1. A preform manufacturing apparatus for forming a cylindrical preform, a skin jig for arranging a skin along an outer peripheral surface of the preform, and a jig for sandwiching the preform and the skin. An apparatus for manufacturing a molded article having a skin, comprising: a pair of dies having opposed cavity surfaces; and a blow device for flowing a fluid into the inside of the preformed body. 2. A cylindrical preform is formed, a skin is arranged along the outer peripheral surface of the preform, the preform and the skin are sandwiched by a mold, and the preform is formed in the mold. A method for producing a molded article having a skin, wherein the molded article is expanded.