JPH07290604A - Method for molding weather-strip for automotive vehicle - Google Patents

Abstract

PURPOSE:To form a smooth and strong film and stiffening the whole by burying reinforcing metal pieces by extrusion-molding the synthetic resin of a weather- strip main body and the synthetic resin of a thin protection film simultaneously In use of two extrusion-molding machines, and burying reinforcing metal pieces in the inner part of a vertical support piece of the strip main body at the same time of extrusion molding. CONSTITUTION:Polyolefine resin of a weather-strip main body 1 or synthetic resin of Its foamed body, and mixed synthetic resin of protective films 6, 6 and protective films 7, 7 are simultaneously extruded by the use of two extrusion molding machines to be passed through the inner part of one mold dies for superimposing both of them, so that a rough surface part such as unevenness or the like generated by heat is formed easily on the surface of the protective films 6, 6 and 7, 7. Besides, for the reinforcing metal piece 5, constitution materials are employed such as iron plate, aluminum, stainless. In addition, for a base material of synthetic resin for forming the protective films 6, 6 and 7, 7, a low viscosity polyethylene is used, having a melt flow rate of at least 0.5g/10min. (ASTMD1238, 190 deg.C).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a smooth sliding opening / closing and a close contact between each joint surface of a weather strip mounted on a door panel to which a door glass window for raising and lowering a door of an automobile or the like is pressed, with less frictional resistance. A method for forming a weather strip for an automobile, which comprises integrally extruding a thin protective film that forms a rough surface and a reinforcing metal piece.

[0002]

2. Description of the Related Art Generally, this type of weather strip, which is brought into pressure contact with a vertically moving door glass window of an automobile or the like, requires smooth and comfortable opening / closing operation of the door glass window and is required to maintain watertightness. It is necessary to withstand the time and achieve the purpose without damage. Therefore, in this type of weather strip, the thin protective film of the pressure contact piece with which the ascending / descending door glass window comes into contact is shown in FIG. 3 with a coating of synthetic resin such as urethane type or a fiber of nylon or the like. As shown, it is currently in general use. However,
The above-mentioned conventional weather strip where the thin protective film of the pressure contact piece of the seal portion is coated with a synthetic resin paint such as a urethane-based one has a drawback that friction resistance increases and does not operate smoothly,
Since it requires a coating material and a coating process, it has the drawback of being expensive and complicated. Further, there is a drawback that it is very difficult to adjust the thickness of the thin protective film. In addition, the thermoplastic elastomer foam is easily scratched even with a small amount of rubbing,
Rough skin easily occurs due to solvents such as white gasoline,
There were also problems such as tears.

[0003]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to extrude a weatherstrip body and to make contact with the exposed surface or door glass window. A thin protective film is integrally formed during molding to form a smooth and strong coating with low friction resistance, and a reinforcing metal piece is embedded inside the support part of the weather strip body to make the whole extremely tough. This is a method for forming a weather strip.

[0004]

In order to solve the above-mentioned problems, the weather strip body of the present invention is formed by a polyolefin synthetic resin or a synthetic resin of its foam in the longitudinal direction, and the weather strip main body is provided in contact with a door glass window. Each facing glass pressure piece is formed. The thin protective film deposited on the contact surface of the door glass press contact portion has a low friction resistance, a chemical resistance, a low viscosity and a high fluidity of the polyolefin base resin base material having a higher viscosity and a higher viscosity than the base material. With a synthetic resin mixed with various small or large powders or particles having low fluidity, the synthetic resin of the weather strip body and the synthetic resin of the thin protective film are simultaneously extruded by two extrusion molding machines, The purpose is to embed the reinforcing metal piece inside the vertical support piece of the weather strip body at the same time as extrusion molding.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, referring to the drawings, an embodiment of the present invention will be described. Door panels (10), (10) that slide in pressure contact with each ascending / descending door glass window (8) of a vehicle (14) such as an automobile.
Opposite weather strip bodies to be mounted on each (1)
Is formed by extruding a thermoplastic elastomer of a polyolefin resin or a synthetic resin of a foam thereof using an extrusion molding machine. The weather strip body (1) of the embodiment shown in FIG.
Is attached through the draining edge frame of the door panel (10) (10) and a part of the leather portion (11). On the weather strip body (1), vertical support pieces (4) (4) and attachment portions (9) (9) facing each other with respect to the door glass window (8) are formed and attached. The vertical support pieces (4) (4) are attached to the tongue-shaped upper pressure contact pieces (2) (2).
The lower pressure contact pieces (3) and (3) are bent and projected so as to be in pressure contact with the door glass window (8).

Further, in the vertical support piece (4), reinforcing metal pieces (5) (5) made of various metals are embedded in the vertical direction of the inner center so as to perform a band-like reinforcing function. .
Further, in the upper pressing pieces (2) (2) and the lower pressing pieces (3) (3), thin protective films (6) (6) are formed on the surfaces of the contact surfaces of the door glass window (8). And the thin protective films (7) and (7) are integrally extruded and polymerized by an extrusion molding machine. The thin protective film (6) (6) and the thin protective film (7)
(7) has a low friction and chemical resistance, a low viscosity and high fluidity polyolefin resin as a base material, and has a higher viscosity and a lower fluidity than the base material. A synthetic resin obtained by mixing various sizes of powder or particles of polyolefin resin is used.

[0007] The synthetic resin of the weather strip body (1) and the polyolefin resin or the foam thereof, the thin protective films (6) (6) and the thin protective films (7) (7).
Simultaneously extruding the mixed synthetic resin of (1) with two extrusion molding machines and letting it pass through the inside of one die to polymerize both, and the thin protective films (6) (6) and (7) )
A rough surface portion such as unevenness caused by heat is easily formed on the surface of (7). The reinforcing metal piece (5)
Uses a constituent material such as an iron plate, aluminum, and stainless steel. Further, the thin protective films (6), (6) and (7)
As a base material of the synthetic resin forming (7), a melt flow rate of 0.5 g or more / 10 minutes (ASTM D1
238 190 ° C.) low viscosity polyethylene is used.
Next, as an additive made of various kinds of large and small powders or particles, a melt flow rate of 0.1 g or less / 10 minutes (AS
TM D1238 190 ° C.) high viscosity polyethylene is used.

Next, the one shown in FIG. 3 is a conventional weather strip body (15), which is made of rubber or thermoplastic extrude, and which is opposed to the door panel (20) (20).
The weather strip main body (15) mounted on the upper part of the weather strip main body (15) has reinforcing metal pieces (19) (19) embedded in the vertical portions facing each other through the door glass window (8), and the upper pressure contact pieces (16) (which face each other). 16) and lower pressure contact pieces (17) and (17) are formed, and the thin protective films (6), (6) and (7) and (7) of the present invention are used instead of the thin protective films (6), (7) and (7) of the present invention on the surface pressed against the door glass window (8). 1 shows a configuration in which flocked materials (18) (18) such as fibers are flocked.

[0009]

As described above, the molded weather strip body (1) of the present invention is prepared by charging the thermoplastic elastomer made of polyolefin resin or its foam into one extrusion molding machine. Next, a low-viscosity, high-fluidity polyolefin synthetic resin that forms a thin protective film is used as a base material, and a high-viscosity, low-fluidity polyolefin-based additive material consisting of powders and particles of various sizes is mixed with this base material. The synthetic resin thus prepared is put into another extrusion molding machine, and extrusion molding is simultaneously carried out using two extrusion molding machines, and extrusion polymerization is carried out inside one die. At this time, the polyolefin resin of the weather strip body and the low viscosity polyolefin synthetic resin of the base material of the thin protective film are
Since they are compatible, they are integrally and strongly polymerized. Furthermore, various types of powders or particles of high-viscosity polyolefin synthetic resin having a high viscosity as an additive for the thin protective film have high viscosity and low fluidity, so that a rough surface portion having fine irregularities can be formed on the surface. High-viscosity polyolefin synthetic resin has high viscosity and low fluidity, so it does not have high fluidity like the base material even in the molten state, and the shape of powder or particles is maintained to some extent. Extrusion molding is performed to form a rough surface portion having fine irregularities on the surface.

[0010]

According to the weather strip of the present invention, since a thin protective film having a small frictional resistance is firmly adhered and polymerized on a portion of the door glass window to be lifted and lowered, it is possible to open and close the door glass window to be lifted and lowered. Excellent effect that can be smoothly and lightly,
As in the past, unlike the case where a synthetic resin paint or a synthetic resin tape is adhered, there is no fear of being easily worn or peeled off, and there is an effect that it can be used in a strongly bonded state for a long period of time. Further, this weather strip has the effect of being firmly and stably attached to the door panel. And
Polyolefin resin, which is a constituent material of the weather strip body, and low viscosity and high fluidity polyolefin resin, which is a base material of the thin protective film with small frictional resistance, which is polymerized on the glass bonding surface of the door-glass window that contacts. Since they are compatible with each other, they have a convenient effect that they can be firmly adhered integrally by heat and pressure during extrusion molding and that the thickness of the thin protective film can be freely adjusted. Further, the synthetic resin of the thin protective film is a synthetic resin in which a polyolefin resin composed of various small or large powders or particles of high viscosity or low fluidity is mixed with a base material of a low viscosity and high fluidity polyolefin resin. By the heat and pressure during extrusion, there is an effect that a rough surface portion having fine unevenness and less friction and watertightness can be reliably formed on the surface of the thin protective film. In addition, the rough surface portion having fine irregularities has an effect which has not been available in the past, that the joining and opening / closing operation of the door glass window for raising and lowering of each vehicle and the like becomes very smooth and light. Furthermore, by embedding a reinforcing metal piece inside the mounting part of the vertical support piece of the weather strip main body at the same time as molding, it strengthens the weather strip main body and it is stably attached to the door panel, and is resistant to use and vibration. Also, there is an effect that it can be safely fixed and used for a long period of time without being deformed. Further, this weather strip has an excellent effect that the specific gravity becomes remarkably lighter than that of a rubber product and the weather strip can be recycled.

[Brief description of drawings]

FIG. 1 is an overall perspective view of a product of the present invention used in a door panel of an automobile.

FIG. 2 is a partially cutaway vertical side view of the state of being used for the line AA of the present invention.

FIG. 3 is a vertical cross-sectional side view of a conventional weather strip used in a door panel.

[Explanation of symbols]

 1 Weather strip body 2 Upper pressure contact piece 3 Lower pressure contact piece 4 Vertical support piece 5 Reinforcing metal piece 6 Thin protective film 7 Thin protective film 8 Door glass window 10 Door panel 13 Door 14 Vehicle

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location // B29K 23:00 105: 04 105: 16 105: 22 423: 00 B29L 31:30 (72) Inventor Naohisa Miyagawa 261-5 Kawaato, Shirai-cho, Inba-gun, Chiba Prefecture Tokiwa Chemical Industry Co., Ltd. (72) Inventor Minoru Masuzawa 3-5-5 Kashiwa, Kashiwa City, Chiba Prefecture Uniparis 504 Masuzawa Chemical Sales Co., Ltd. (72) Inventor Katsuhisa Kato 22-22 Matsugaoka, Moriya-cho, Kitasoma-gun, Ibaraki Prefecture 5 System Tech Co., Ltd.

Claims (1)

[Claims] 1. A weather strip body is extruded from a polyolefin synthetic resin or a synthetic resin of a foam thereof, and the weather strip body is mounted on door panels facing each other through a door glass window and is facing each other. On the weather strip body, one or a plurality of upper pressure contact pieces or lower pressure contact pieces is pressure-contacted to the door glass window, and a thin protective film is integrally coated on the sliding surfaces of the upper pressure contact piece and the lower pressure contact piece with the door glass window. The thin protective film is made of a polyolefin-based synthetic resin having low friction resistance, excellent chemical resistance, low viscosity and high fluidity as a base material. Using a synthetic resin mixed with the above powder or particles of polyolefin resin, it is embedded inside the polyolefin synthetic resin of the weather strip body and the vertical support piece of the mounting part. A method of forming a weather strip, comprising: forming a reinforcing metal piece and a synthetic resin of the thin protective film by extrusion molding at the same time, and forming a rough surface portion having irregularities on the surface of the thin protective film.