JPS61275042A - Synthetic resin molding and manufacture thereof - Google Patents

Abstract

PURPOSE:To prevent a foamed section from projecting outward as a result of gas contained by providing numbers of small holes which open on the back side of a molded item penetrating a foamed resin layer of an integrally molded item, the upper surface of which is covered with a non-intumescent resin layer. CONSTITUTION:A molding 2 is an integrally molded item, which is composed of a foamed resin layer 3 on the back side, a non-intumescent resin layer 4 on the upper surface side, and of a material in a sheet form in a middle section, having a core material which is not permeable to gas. And numbers of small holes 12 which open on the back side of the molded section 11, are distributed evenly to the longer direction of the molded item 11 where the tip end of the hole reaches the core material.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a synthetic resin molding that is attached to a vehicle or the like and used for protection or decoration, and a method for manufacturing the same.

[Conventional technology]

FIG. 6 is a perspective view of the car body, FIG. 7 is a perspective view of the molding, and FIG. 8 is a perspective view of the back side of the molding.
FIG. 9 is a sectional view taken along the line AA in FIG. 6. In the figure, 1
is a vehicle body, and synthetic resin moldings (side moldings) 2 are attached to the sides. The molding 2 has a foamed resin layer 3 made of PVC resin or the like on the back side, and a solid non-foamed resin layer 4 made of the same PVC resin or the like on the outer surface side. A gas-impermeable core material 5 made of aluminum foil, a rigid synthetic resin sheet, or the like is integrally extruded so as to be polymerized between them.

The above-mentioned molding 2 is manufactured by cutting a long material integrally molded by extrusion molding etc. into a predetermined size, and processing the ends, and as shown in FIG. is attached to the vehicle body 1 and used.

[Problem that the invention seeks to solve]

However, in such conventional molding, immediately after being extruded from the extrusion mold during manufacturing, the pressure inside the extrusion mold is released, and when the foamed resin layer 3 is in an unstable state at high temperature, the eighth As shown in the figure, gas gathers and large bubbles 7 are generated, and a protrusion 8 is generated on the back side.
Even if the protrusions 8 do not occur during manufacturing, when used in the hot sun, the foaming agent contained in the foamed resin layer 3 may be activated, and the protrusions 8 may also occur.

If the protrusion 8 occurs in this way, not only will the adhesive surface with the car body 1 decrease, but if it occurs during use, the protrusion 8 will not only reduce the adhesive surface to the car body 1.
There is a problem in that a force is applied to peel off the molding 2 from the molding 2, resulting in a reduction in the mounting strength of the molding 2.

The present invention has been made to solve the above-mentioned problems, and aims to provide a molding that does not cause protrusions due to gas in the foam layer and has high mounting strength, and a method for manufacturing the molding.

[Means for solving problems]

The present invention is the following synthetic resin molding and its manufacturing method.

(1) A molded product consisting of a foamed resin layer and a non-foamed resin layer integrally formed on at least the outer surface side of the foamed resin layer, and this molded product has many pores that open from inside the foamed resin layer to the back side of the molded product. A synthetic resin molding characterized by having.

(2) Extrusion molding a molded product having a foamed resin layer and a non-foamed resin layer on at least the outer surface side, and while the extruded molded product is softened at high temperature, insert the molded product into the foamed resin layer from the back side of the molded product. A method for producing a synthetic resin molding, which comprises inserting a needle-like object into the material to form pores.

[For production]

The synthetic resin molding of the present invention is manufactured by extrusion molding or the like, and is used by attaching the back side to the vehicle body in the same manner as conventional moldings. This molding has pores that open from the foamed resin layer to the back side, so even if gas is generated during manufacturing or use, it will be discharged through the pores, eliminating the need for protrusions on the back side and making it easier to attach to the vehicle body. The intensity increases.

In the manufacturing method of the second invention, pores can be formed in the molded product immediately after extrusion molding, and therefore, pores can be easily formed without requiring an independent pore-forming step.

〔Example〕

FIG. 1 is a perspective view of a molding according to an embodiment of the present invention as seen from the back side, and FIG. 2 is a sectional view of a part thereof, and the same reference numerals as in FIGS. 6 to 8 indicate the same or corresponding parts. show. The molding 2 has a foamed resin layer 3 made of foamed resin such as PvC resin on the back side, a non-foamed resin layer 4 made of non-foamed resin such as PvC resin on the outer surface side, and an intermediate layer between them. It consists of an integrally molded product 11 with a gas-impermeable core material 5 made of a rigid sheet-like material such as aluminum foil or a hard synthetic resin sheet. On the back side of the molded product 11, there are a large number of pores 12 that open from inside the foamed resin layer 3 to the back side of the molded product 11.
They are formed substantially uniformly over the entire back surface of the molded product 11 at substantially constant pitches in the longitudinal direction, and their tips reach the core material 5 .

The molding 2 described above can be manufactured by forming the pores 12 immediately after extruding the molded product 11, cutting the molded product 11 to a predetermined size, and processing the ends, but it can also be manufactured by injection molding or other methods. You can also. The molding 2 manufactured in this manner is attached to the vehicle body 1 using an adhesive 1 and a fixing material 6 such as double-sided adhesive tape on the back side where the pores 12 are located, as in the conventional molding.

Since the molding 2 described above has pores 12, even if gas is generated during manufacturing or use, it is discharged through the pores 12, and as a result, large air bubbles 7 are not generated as in the conventional case, and the gas bubbles protrude to the back side. Part 8 does not occur. Therefore, the number of adhesive surfaces with the vehicle body 1 increases, and the attachment strength increases. The core material 5 is buried in order to prevent deformation of the outer surface side due to air bubbles 7 generated in the foamed resin layer 3 and to provide rigidity.
Since air bubbles 7 are likely to be generated near the core material 5, if the pores 12 reach the core material 5, the generation of air bubbles 7 near the core material 5 is prevented.
Peeling of the foamed resin layer 3 and the core material 5 is prevented.

FIG. 3 is a perspective view of a molding according to another embodiment, seen from the back side. In this embodiment, the non-foamed resin layer 4 is also formed on the back side of the foamed resin layer 3, and the pores 12 pass through the non-foamed resin layer 4 from inside the foamed resin layer 3 to the back side of the molded product 11. The opening is open to the left, and substantially the same effect as in the embodiment described above can be obtained.

4 and 5 are front views showing a manufacturing method according to another embodiment of the present invention, respectively, in which 13 is a core roll;
14 is an extrusion mold. In either case, the molding manufacturing method involves supplying the core material 5 from the core material roll 13 to the extrusion mold 14, and then supplying the foamed resin containing a foaming agent and the non-foaming resin containing no foaming agent from two extruders (not shown). A foamed resin is supplied to an extrusion mold 14 to extrude a molded product 11 integrally having an extrusion 1 foamed resin layer 3, a non-foamed resin layer 4, and a core material 5 on both sides of a core material 5.

In the case of FIG. 4, a wheel 16 from which a plurality of needles 15 protrude is pressed against the back side of the molded product 11 while the molded product 11 is in a softened state at a high temperature immediately after leaving the extrusion mold 14. As the molded product 11 moves, the wheel 16 rotates, and the needle 15 is inserted to continuously form the pores 12. In the case of FIG. 5, a slide plate 17 having a plurality of needles 15 at its tip is slidably attached to the extrusion mold 14, and is moved up and down by an eccentric crank 18 to form pores 12 by inserting the needles 15. be done. In the case of FIG. 5, the rotation shaft of the eccentric crank 18 is preferably controlled so as to be synchronized with the rotation of the screw of the extruder.

According to the above manufacturing method, in any case, the pores 12 are formed while the molded product 11 is in a softened state immediately after extrusion molding, so the pores 12 can be formed easily and accurately. The pores 12 can be easily formed during the extrusion molding process, eliminating the need for an independent pore formation process.

In the above description, the shape of the molding 2.

Structure, material, etc. can be changed. Also molding 2
This is not limited to side moldings.

It may also be a molding for other vehicles.

Further, the manufacturing method is not limited to extrusion molding, and the method for forming the pores 12 is not limited to the above-described method.

〔Effect of the invention〕

Since the synthetic resin molding of this invention has pores formed on the back surface, gas generated in the foamed resin layer during manufacturing or use is exhausted, thereby preventing the formation of protrusions on the back surface or the outer surface side, and increasing the installation strength. becomes higher.

Further, according to the manufacturing method of the second invention, since the pores are formed immediately after extrusion molding, the above-mentioned molding can be easily obtained through a simple process, and the pores can be easily and accurately formed.

[Brief explanation of drawings]

1 and 3 are perspective views of moldings seen from the back side according to different embodiments, FIG. 2 is a sectional view of a part of FIG. 1, and FIGS. 4 and 5 are respectively different embodiments. 6 is a perspective view of an automobile body, FIG. 7 is a perspective view of a conventional molding, and FIG.
The figure is a perspective view seen from the back side, and Figure 9 is A- of Figure 6.
It is an A sectional view. In each figure, the same reference numerals indicate the same or corresponding parts. 2 is a molding, 3 is a foamed resin layer, 4 is a non-foamed resin layer, 5 is a core material, 11 is a molded product, and 12 is a pore. 14 is an extrusion mold, 15 is a needle, 16 is a wheel, 17 is a slide plate, and 18 is an eccentric crank. Agent Patent Attorney Sei Yanagihara Figure 1 Figure 3 Figure 6 Figure 7

Claims (7)

[Claims] (1) Consists of a molded product in which a foamed resin layer and a non-foamed resin layer are integrally formed on at least the outer surface side of the foamed resin layer, and this molded product has many pores that open from inside the foamed resin layer to the back side of the molded product. A synthetic resin molding characterized by having. (2) The molding according to claim 1, wherein the non-foamed resin layer is also formed on the back side of the foamed resin layer. (3) The molded article has a gas-impermeable core material between the foamed resin layer and the non-foamed resin layer on the outer surface side.
The molding according to item 1 or 2. (4) The molding according to claim 3, wherein the pores penetrate the foamed resin layer and reach the core material. (5) Extrusion molding a molded product having a foamed resin layer and a non-foamed resin layer on at least the outer surface side, and while the extruded molded product is in a softened state at a high temperature, insert the foamed resin layer from the back side of the molded product. A method for producing a synthetic resin molding, which comprises inserting a needle-like object into the material to form pores. (6) The manufacturing method according to claim 5, wherein the needle-like object is inserted by pressing a wheel having a protruding needle-like object against the molded product. (7) The manufacturing method according to claim 5, wherein the needle-like object is inserted by vertically moving a slide plate having a needle-like object at the tip.