JPH06190895A - Method for molding weatherstrip for automobile - Google Patents

Abstract

PURPOSE:To mold integrally a thin coat having good abrasion and chemical resistance in a process in which a weatherstrip for automobiles is molded in the longitudinal direction, and a synthetic resin has compatibility with the surface of an external part which is exposed when the weatherstrip is used. CONSTITUTION:A weatherstrip mainbody 1 is molded from a polyolefine type thermoplastic elastomer of or its foamed product. A thin coat 5 with thickness of 0.05mm or less which is made of a polyolefine type resin having excellent abrasion and chemical resistance is extruded respectively with two extruders on the surface of the weatherstrip which is externally exposed when it is attached to a car body panel and a door panel. Concurrently, material in one mold die is extruded to fuse both together.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is characterized by integrally forming a coating for strengthening the exposed surface of a vehicle body panel on the outer periphery of a door door glass in an automobile and a weather strip attached to the door panel. The present invention relates to a method for forming a weather strip for an automobile.

[0002]

2. Description of the Related Art Conventionally, a weather strip which seals glass for raising and lowering doors of automobiles of this type repeats raising and lowering opening and closing a number of times, and it is necessary to smoothly and comfortably perform opening and closing operations of the raising and lowering window glass. Further, airtightness is required to be maintained, and the appearance is required to be aesthetic for a long period of time. Therefore, this kind of weather strip is formed by using a thermoplastic elastomer, which is a material that has flexibility, elasticity, and cushioning properties, and is made of synthetic rubber or a material that can be reduced in weight. On the surface that comes in contact with glass, fine hair such as nylon or polyester is flocked or a synthetic resin coating such as urethane or nylon is dissolved, but the surface of other weather strips is not treated. Is generally known to be used without implementation.

[0003]

Since the surface of the conventional weather strip remains in the molded state, the surface is not glossy and very easily scratched. Further, the exposed portion of the weather strip made of a thermoplastic elastomer or its foam is easily scratched by light rubbing, and the surface is roughened by a solvent or chemicals such as aromatic kerosene and white gasoline. There were many problems such as occurrence. The present invention has been made in view of the problems of the prior art, and its object is to integrally extrude a thin coating film for reinforcement on the surface exposed during use of the weather strip. Therefore, it is an object of the present invention to provide a method for forming a weather strip that is excellent in appearance by preventing damage over a long period of time.

[0004]

In order to achieve the above object, in the weather strip of the present invention, the weather strip main body is molded with a polyolefin resin or a foam thereof, and the weather strip main body is joined to the door door glass. The glass pressure welding part, the vehicle body panel, and the attachment part attached to the door panel are extrusion molded. A thin film made of a synthetic resin of polyolefin resin excellent in abrasion resistance and chemical resistance was fused at the same time as the extrusion molding of the weather strip body on each surface exposed when the weather strip was mounted. This is a molding method in which the exposed surface is strongly reinforced by integrally covering and molding in a state.

[0005]

EXAMPLES Examples of the present invention will now be described. In the vicinity of the vehicle body panel (7) and the door panel (8) located on the outer periphery of the lifting door glass (6) in various vehicles (10) such as automobiles. Weather strip body to be attached (1)
Is composed of a thermoplastic elastomer of polyolefin resin or a foamed synthetic resin body thereof. In this weather strip body (1), glass press contact parts (3) of various shapes are formed in the parts press contacting the elevating door glass (6), and are attached to the vehicle body panel (7) and door panel (8) respectively. The attachment member (12) having various shapes is extruded to form the longitudinal member. Next, the weather strip main body (1) is made of a synthetic resin of polyolefin resin, which is remarkably strong in abrasion resistance and chemical resistance with respect to the surface exposed to the outer surface at the position where it is mounted and is used. A thin film (5) having a thickness of 05 mm or less is extruded by another extruder at the same time as the weather strip body (1) is extrusion-molded, and then extruded from the inside of one mold die to integrally form a film layer on the surface. is there. Reference numeral (4) indicates a tape or flock provided on the contact surface of the lifting door glass (6), and reference numeral (9) indicates a support sash for attaching the vehicle body panel (7).

[0006]

The thermoplastic elastomer of the coated weatherstrip body (1) molded as described above, which is made of polyolefin resin, is put into an extrusion molding machine to have a thickness of 0.05 m.
The polyolefin high molecular weight polyethylene that forms a thin film (5) of m or less is put into another extrusion molding machine, and the extrusion work is performed simultaneously by using two extrusion molding machines. Polymerize. At this time, since the synthetic resins are compatible with each other, the surface and the whole are integrally fused by the heat and pressure at the time of extrusion molding to be toughened. The thickness of the thin film (5) is 0.05 mm.
The thickness can be adjusted to an appropriate thickness below. The thickness of the thin film (5) is most preferably 0.05 mm or less, and 0.05 mm or more is unnecessary. Further, the specific gravity of the polyolefin-based thermoplastic elastomer is 0.88, and the specific gravity of the rubber is reduced by 30 to 40% as compared with 1.25.

[0007]

As described above, according to the weather strip of the present invention, the constituent material of the weather strip is a thermoplastic elastomer made of a polyolefin resin, and the surface exposed to the outside has excellent abrasion resistance and chemical resistance. By forming a thin film with a thickness of 0.05 mm or less of the polyolefin resin, the surface has a very good appearance and prevents scratches as well as cuts,
It has the advantage of maintaining gloss for a long period of time and improving the quality, and also has the effect of preventing the skin from being invaded by the chemicals even with solvents such as aromatic kerosene and white gasoline. Also,
Since the thermoplastic elastomer of the weatherstrip body and the polyolefin resin forming the thin film are compatible with each other, they are extruded at the same time, and the heat and pressure during extrusion are used to fuse the entire body together. It also has the effect of strengthening. Then, the synthetic resin material can be appropriately selected for each of the two extruders, that is, the weather strip extruder and each extruder that forms a thin film. Also, since the one extruded from each extruder is inserted and crimped through the inside of one die, it is remarkably tougher than the conventional one with synthetic resin paint and flocking attached, and the thin coating is firm. Has the effect of being integrated. Further, there is a convenient effect that the thickness of the thin coating can be freely adjusted to an appropriate thickness of 0.05 mm or less.

[Brief description of drawings]

FIG. 1 is an overall perspective view of the present invention applied to various parts of a vehicle.

FIG. 2 is likewise a vertical side view taken along the line AA of FIG.

FIG. 3 is likewise a vertical cross-sectional side view taken along the line BB of FIG.

FIG. 4 is a partially cutaway front view of the present invention mounted on a vehicle body panel.

FIG. 5 is a vertical sectional side view in which the present invention is also mounted on a vehicle body panel.

[Explanation of symbols]

 1 Weather strip body 2 Attachment part 3 Glass pressure welding part 5 Thin film 6 Lift door glass

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Claims (1)

[Claims] 1. In a method of molding a vehicle weather strip, which is mounted on a vehicle body panel located on the outer periphery of an elevating door glass and a vehicle door panel in various automobiles, the weather strip body is a thermoplastic elastomer of a polyolefin resin or a foam thereof. The body is made of a body and a longitudinal member is formed by extruding a glass press-contacting part that press-contacts with the elevator door glass and an attachment part that is mounted on the vehicle body panel and the door panel, and wear-resistant on the exposed surface of the weather strip body. A thin film of 0.05 mm or less made of a synthetic polyolefin resin having excellent chemical resistance is extrusion-molded at the same time by each extruder of the weather strip body and then extruded inside one die. A method for forming a weather strip for an automobile, which is characterized by being formed.