JPH0129131B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method of manufacturing a molding for a vehicle having a hard synthetic resin layer on its outer surface.

[Prior art]

Some moldings for vehicles, such as weather strip belt moldings, have a hard synthetic resin layer on the outer surface of a metal profile. 1st
The figure is a sectional view showing a conventional weather strip belt molding, FIG. 2 is an enlarged view of part A, and FIG. 3 is an enlarged view of part B. In the drawings, reference numeral 1 denotes a molding, in which a hard synthetic resin layer 3 is formed on the outer surface side L of a metal profile 2 bent into an inverted U-shaped cross section, and a decorative film 4 is formed on a part of the hard resin adhesive layer 5. A soft synthetic resin layer 6 is formed on the U-shaped inner side M and the glass side N via a soft resin adhesive layer 7, and a soft synthetic resin layer 6 is formed on the U-shaped inner side M and the glass side N.
A soft synthetic resin lip 8 is integrally formed from the soft synthetic resin layer 6. 9 is a window glass.

FIG. 4 is a system diagram showing a conventional manufacturing method, FIG. 5 is a sectional view taken along the line C-C, FIG. 6 is a sectional view taken along line DD, and FIG. 7 is a sectional view taken along line EE. The conventional manufacturing method for molding 1 is to send out a rust-proofed metal strip 12, which will become the profiled material 2, and a bright metal foil 13, which will become the decorative film 4, from uncoilers 10 and 11, and then coat them with a hard resin adhesive layer in a roll coater 14. 5 is formed and baked in the baking device 15, a soft resin adhesive layer 7 is formed in the roll coater 16 and baked in the baking device 17, and the roll forming device 1
8 to form a profiled material 2 with a predetermined cross-sectional shape, which is heated together with a metal foil 13 in a heating device 19 to activate the adhesive layers 5 and 7, and then inserted into an extrusion mold 20. After extruding the soft resin and hard resin from another extruder (not shown) to form the soft resin layer 6 and lip 8 via the adhesive layer 7,
A hard resin layer 3 is formed via an adhesive layer 5 to obtain a molding 1.

However, in such conventional molding manufacturing methods, methyl methacrylic resin or cellulose acetate butyrate resin is used as the hard resin, and soft vinyl chloride resin is used as the soft resin, which causes the following problems. Ta.

The hard resin layer 3 and the soft resin layer 6 each have different preferred baking temperatures for the adhesives used.
Furthermore, since the preferred molding temperatures are different, the interface with the adhesive is likely to peel off.

Adhesive layers 5 and 7 require separate adhesives and have different baking temperatures, making temperature control complicated, and adjusting to one condition lowers the adhesive strength of the other, making it easy to peel off.

Since hard resin and soft resin have different melting temperatures, they cannot be extruded at the same time in the extrusion mold and must be extruded to separate positions at different times. When this resin is extruded, the extrusion pressure causes the profiled material 2 to be deflected, making it impossible to form both resin layers uniformly. For example, if a soft resin is extruded first, the extrusion pressure will press the profile 2 against the mold surface of the extrusion mold 20, creating frictional resistance, and the profile 2 will vibrate at an inconsistent speed, causing the hard resin to be extruded. When the resin is extruded, a wavy pattern appears on the outer surface. Especially if the soft resin is extruded to one side first, the irregularly shaped material 2
Also, the spacing between the metal foils 13 becomes narrower, making it difficult for the hard resin to enter therebetween.

[Purpose of the invention]

This invention is intended to solve the above-mentioned problems, and by forming a soft resin layer on both sides of a profiled material and a compatible hard resin layer on the outer surface, it is possible to use one type of adhesive. The object of the present invention is to propose a method for manufacturing a vehicle molding in which hard and soft resin layers can be formed uniformly and to a predetermined size, and peeling does not occur.

[Structure of the invention]

This invention provides a method for manufacturing a vehicle molding having a soft synthetic resin layer on one side of a profiled material and a hard synthetic resin layer on the opposite side. a step of bending the metal strip into a profiled material with a predetermined constant cross-sectional shape by roll forming;
and the obtained profiled material is continuously supplied to an extrusion mold, and a soft synthetic resin layer is formed on both sides of the profiled material via the adhesive layer within the extrusion mold, and then
This is a method of manufacturing a molding for a vehicle, which includes a step of welding and forming a hard synthetic resin layer having substantially the same thickness on the soft synthetic resin layer on the outer surface side, which is compatible with the soft synthetic resin.

[Embodiments of the invention]

Hereinafter, the present invention will be explained with reference to embodiments of the drawings.
8 to 12 show one embodiment of the present invention, FIG. 8 is a cross-sectional view of the fabricated weather strip belt molding, FIG. 9 is an enlarged view of the F section, and FIG. 10 is the manufactured weather strip belt molding. Systematic diagram showing the method, No. 11
The figure is a sectional view taken along the line GG, and FIG. 12 is a sectional view taken along the line HH, and the same reference numerals as in FIGS. 1 to 7 indicate the same or corresponding parts.

In the molding 1, a soft resin layer 6 is formed via an adhesive layer 7 so as to cover all surfaces of the metal profile 2, that is, the outer surface side L, the U-shaped inner side M, and the glass side N. The outer surface side L
A hard resin layer 3 having direct compatibility with the material is welded to the material. The decorative film 4 is adhered to the soft resin layer 6 via the adhesive layer 7, and is sandwiched between the hard resin layer 3 and the soft resin layer 6 at both ends thereof. The other structure is the same as that in FIG.

In the manufacturing method, uncoilers 10 and 11 send out a rust-proofed metal strip 12 that will become the profile 2 and a bright metal foil 13 made of stainless steel or the like that will become the decorative film 4, and a roll coater 16 will coat both sides of the metal strip 12 and the metal foil. A soft resin adhesive layer 7 is formed on one side of the metal strip 13 and baked in a baking device 17, and the metal strip 12 is bent and formed in a roll forming device 18 to form a metal profile 2 having the shape shown in FIG. and the heating device 1 together with the metal foil 13
9, the extrusion mold 20 is activated, the soft resin and the hard resin are extruded, and the two surfaces of the profiled material 2 are bonded via the adhesive layer 7, that is, the outer surface side L, the U-shaped inner side M, and the glass side N. After forming a soft synthetic resin layer 6 between the metal foils 13, a compatible hard resin layer 3 is formed and welded to the soft resin layer 6 on the outer surface side L, and both ends of the metal foil 13 are sandwiched. , manufacturing molding 1.

It is sufficient that the soft resin and hard resin are compatible, but if resins with the same main components are used, such as soft vinyl chloride resin and hard vinyl chloride resin, they can be molded under the same molding conditions and can be molded under the same molding conditions. Adhesives can be used and are preferred. A modified phenol type adhesive can be used as the adhesive.

In the above manufacturing method, the soft resin layer 6 is
When extruding the soft resin, the extrusion pressure is applied uniformly to both sides of the profiled material 2, the profiled material 2 is not unevenly distributed, and the soft resin layer 6 is uniformly formed over the entire surface of the profiled material. 2 and the metal foil 13 evenly. In addition, since the hard resin layer 3 is welded to the soft resin layer 6, peeling does not occur, and it is evenly formed on the uniformly formed soft resin layer 6, so that the surface is not disturbed and the surface is glossy. A uniform gloss can be formed on the surface even when using a hard resin.

In addition, in the above description, a part of the profiled member 2 may be exposed. Further, the decorative film 4 may be a colored metal film or the like. Furthermore, the present invention is applicable not only to weather strip belt moldings but also to the manufacture of windshield moldings and other vehicle moldings.

〔Effect of the invention〕

According to this invention, after a soft synthetic resin layer is formed on both sides of the profiled material via an adhesive layer, a compatible hard synthetic resin layer is formed on the outer surface of the soft synthetic resin layer. It is sufficient to use the same adhesive on both sides, and when extruding the soft synthetic resin, the extrusion pressure is applied uniformly to both sides of the profiled material, so that the profiled material is not unevenly distributed and the soft synthetic resin layer is uniformly distributed over the entire surface. The hard resin can be formed at a constant speed without vibrating in contact with the mold surface, so when the hard resin is extruded onto the soft resin layer, the hard resin has a uniform thickness and appearance. layers can be formed. In addition, there is no peeling between the resin layers, and only one type of adhesive is required, which simplifies the process. It also makes it easier to control the baking temperature and extrusion temperature. , dimensions, and appearance.

In the manufactured vehicle molding, the metal profile acts as the core material of the molding,
It provides rigidity and shape retention to the molding, so there is no expansion or contraction, making it easier to handle and attach to vehicle body panels.Also, the outer surface is covered with a hard synthetic resin layer, compared to a soft synthetic resin layer. It is hard to get scratches, etc., and the texture on the outer surface side is softer than when it is made only of hard synthetic resin, giving it a good texture with a slight flexing feeling when pressed with your fingers. Since the soft synthetic resin layer on the profiled material absorbs the impact, the outer surface will not be cracked or damaged.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing a conventional weather strip belt molding, Fig. 2 is an enlarged view of part A, Fig. 3 is an enlarged view of part B, and Fig. 4 is a system diagram showing the conventional manufacturing method. FIG. 5 is a sectional view taken along line C-C, FIG. 6 is a sectional view taken along line DD, FIG. 7 is a sectional view taken along line E-E, and FIGS. The figure is a sectional view of the manufactured weather strip belt molding, Figure 9 is an enlarged view of the F part, Figure 10 is a system diagram showing the manufacturing method, and Figure 11
The figure is a cross-sectional view taken along line GG, and FIG. 12 is a cross-sectional view taken along line H-H. In each figure, the same reference numerals indicate the same or equivalent parts, 1 is the molding, 2 is the metal profile, 3 is the hard synthetic resin layer, 4 is the decorative film, 5 and 7 are the adhesive layers, and 6 is the soft synthetic resin. 8 is a lip, 9 is a window glass, 12 is a metal strip, 13 is a bright metal foil, 14 and 16 are roll coaters, 15 and 17 are baking devices, 18 is a roll forming device, 19 is a heating device, and 20 is an extrusion device. It is a mold.

Claims (1)

[Claims] 1. Having a soft synthetic resin layer on one side of the profiled material,
A method of manufacturing a molding for a vehicle having a hard synthetic resin layer on the opposite side includes a step of forming the same adhesive layer on both sides of a metal strip, and forming the metal strip into a deformed material with a predetermined constant cross-sectional shape by roll forming. After continuously feeding the obtained profiled material into an extrusion mold and forming a soft synthetic resin layer on both sides of the profiled material via the adhesive layer in the extrusion mold, . A method for manufacturing a molding for a vehicle, which includes the step of welding and forming a hard synthetic resin layer that is compatible with the soft synthetic resin to approximately the same thickness on the soft synthetic resin layer on the outer surface side. 2. The manufacturing method according to claim 1, wherein the soft synthetic resin and the hard synthetic resin have the same main component. 3. The manufacturing method according to claim 1 or 2, wherein both the soft synthetic resin and the hard synthetic resin are vinyl chloride resins. 4. The manufacturing method according to any one of claims 1 to 3, wherein the soft synthetic resin layer is formed between the decorative film exposed on the outer surface and the profiled material.