JP2007245697A - Molding method for automobile weatherstrip - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding method for a weatherstrip to be used for shock absorbing and restoring by fitting the same to a panel opening/closing an opening portion of a car body such as doors, trunks, windows or the like of automobiles or the like. <P>SOLUTION: The weatherstrip is formed of a fitting part to be fitted to the car body and of a hollow sealing part to be pressed to the opening/closing panel. With a thermoplastic elastomer forming the weatherstrip injected into a first extruder and a hard synthetic resin injected into a second extruder, the two extruders are operated simultaneously, and one or a plurality of thin film layers having a thickness of 0.05 mm or less are heat welded to the inner peripheral surface of the hollow seal part in the longitudinal direction inside of one die. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for forming a weather strip for an automobile mounted on a vehicle body opening such as an opening / closing door, a trunk, and a window of each automobile or various opening / closing panels that open and close the vehicle body opening.

Conventionally, this type of automobile weather strip is mounted on a vehicle body panel at the opening of the vehicle body, and the hollow seal portion of the weather strip is pressed against various open / close panels such as open / close doors and trunks to be compressed and waterproof and sound-insulating. In order to provide an excellent weather strip, the outer surface of the core material having a substantially U-shaped cross section is coated with a covering by a thermoplastic elastomer injected into an extrusion molding machine. It is common practice to form a hollow seal on the outside.
In order to improve the waterproofness and sound insulation with the opening / closing panel, the thermoplastic elastomer of the hollow seal portion is soft and has a resilience, and uses a synthetic resin having a hardness of HDA50 (JIS K7215) or less. .
However, the mixing amount of rubber and oil is increased as a component for softening the hardness of the thermoplastic elastomer, and a phenomenon such as stickiness on the surface occurs due to the softness on the inner surface side of the hollow seal part after extrusion molding. When the hollow seal portion compressed by the opening and closing operation of the open / close panel is opened by mounting the weather strip on the vehicle body opening portion of the automobile, due to the weak adhesion due to the sticky shape of the surface on the inner surface side of the hollow seal portion However, it takes time to restore the hollow seal portion from the compressed state to the original state, and there is a problem that abnormal noise occurs.

  The present invention has been invented to solve the above-described problems. The hollow seal portion made of a conventional thermoplastic elastomer is compressed, and the hollow seal portion is restored by a sticky shape appearing on the inner surface. An object of the present invention is to provide a method for forming a weather strip for automobiles in which a thin film layer of 0.05 mm or less made of a hard synthetic resin is formed on the inner surface of the hollow seal portion so that it does not take time.

In order to achieve the above object, according to the present invention, a weather strip is formed by a hollow seal portion in the longitudinal direction and a mounting portion for attaching to a vehicle body panel. Inject a thermoplastic elastomer to mold. A hard synthetic resin is injected into the second extrusion molding machine. Thereafter, the core first extrusion molding machine and the second extrusion molding machine are operated simultaneously, and 0.05 mm or less made of the hard synthetic resin on the inner peripheral surface of the hollow seal portion inside one mold die. The thin film layer is thermally fused to a part of the longitudinal direction or the entire inner peripheral surface, and then cooled to increase the restoring force against compression by opening and closing.
In addition, a plurality of the thin film layers are heat-sealed in the longitudinal direction with a predetermined interval on the inner peripheral surface of the hollow seal portion, and then cooled and molded, thereby strengthening toughness and restoring force against compression. To achieve.

  As described above, according to the weather strip formed according to the present invention, it is always possible to quickly restore from the compressed state by the contact operation by opening and closing various opening and closing panels, the effect that no abnormal noise occurs, and the overall soft synthesis Resin can increase the restoring force and also has the effect of reinforcing the softness. And since the thin film layer heat-fused in the longitudinal direction of the inner peripheral surface of the hollow seal portion by the hard synthetic resin injected into the second extrusion molding machine was formed partially or entirely on the inner periphery, the weather strip hollow shape The seal portion has an excellent effect that the strength is remarkably reinforced and the seal portion can be used without being damaged over a long period of time. Further, since the thickness of the thin film layer is also 0.05 mm, in order to operate the first extruder and the second extruder at the same time in the longitudinal direction in the mold die, the weight can be reduced without any problem in weight. This thin film layer has the effect that it can be remarkably easily formed. In addition, since a plurality of thin film layers are formed and deposited at predetermined intervals on the inner peripheral surface of the hollow seal portion, the entire structure can be strengthened and the resin material can be saved, and also against compression. There is also an effect that the gap portion acts and the restoration is remarkably fast and the stickiness is eliminated.

  According to the extruded product of the weather strip for automobiles molded as described above, the hollow seal portion and the mounting portion containing the core material are molded integrally, and the thin film layer is formed inside the hollow seal portion. The weather strip shown in FIG. 1 which has been heat-sealed is attached by pressing the flange of the vehicle body panel between the holding pieces of the mounting portion, and firmly attached to the edge of the opening of the door, trunk or the like.

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a weather strip (1), which shows an extruded section, such as an automobile door, trunk and window. Attached to the opening for use.
The weather strip (1) is formed in the longitudinal direction by a first extrusion molding machine (15), and a circular hollow seal part (2) and a mounting part (3) are integrally formed at the end part. The hollow seal portion (2) and the mounting portion (3) may be connected via the diameter portion (9). The hollow seal portion (2) has a U-shaped cross section inside the mounting portion (3) in which a thin film layer (4) made of a hard synthetic resin is thermally fused to a part of the inside in the longitudinal direction. A core material (7) is embedded. The core (7) is integrally coated with an outer peripheral covering (5) on the outer side and an inner peripheral covering (6) on the inner side. In addition, a plurality of opposing holding pieces (8) and (8) are provided on the inner peripheral cover (6). The holding piece (8) may be installed in an appropriate quantity. Furthermore, the shape of the hollow seal portion (2) may be an ellipse or a polygon.
FIG. 2 shows a conventional example in which a weather strip (1) is mounted on a vehicle body panel (11), and the mounting portion (3) is mounted on a flange (12) of the vehicle body panel (11). ) Holding pieces (8) and (8) are mounted in a pressed state, and the hollow seal portion (2) of this conventional example is pressed and compressed by the open / close panel (10), and is in a close contact state. In summer when the temperature is high, stickiness and the like occur, and it takes time to restore.

In the embodiment shown in FIG. 3, a thin film layer (4) of 0.05 mm or less made of a hard synthetic resin is formed on the entire inner peripheral surface of the hollow seal portion (2) described in claim 1 by heat fusion. Laminated.
Next, the embodiment shown in FIG. 4 has a predetermined interval by using a hard synthetic resin from the second extruder (16) on the inner peripheral surface of the hollow seal portion (2) described in claim 2. A plurality of thin film layers (4) having a thickness of 0.05 mm or less are laminated by heat fusion.
5 shows a core material (7) made of a hard synthetic resin or a metal plate formed in a U-shaped cross section that is entirely or partially embedded in the mounting portion (3). In (7), cut-out portions (13) and (13) convenient for bending, each having a predetermined interval on the corresponding side, are formed by punching.
In the embodiment shown in FIG. 7, the hollow seal portion (2) has a polygonal shape.

  The embodiment shown in FIG. 6 shows a process of extruding a weather strip (1) in which a core material (7) is embedded in the mounting portion (3), and the core material (7) is a mold die (17). Of the hollow seal portion (2) and the outer peripheral mounting portion (3) of the core material (7) and the thermoplastic elastomer or foam thereof injected into the first extrusion molding machine (15). The outer periphery covering body (5), the inner periphery covering body (6) and the holding pieces (8) and (8) are formed integrally. Next, thin film layers (4) and (4) in which the respective states are changed on the inner peripheral surface of the hollow seal portion (2) by the hard synthetic resin injected into the second extrusion molding machine (16) are die dies. It is heat-sealed within (17). Thereafter, after passing through the cooling bath (18), the weather strip (1) is completed by the operation of the take-up machine (19). Further, the mounting portion (3) is formed by additionally using another extruder with a thermoplastic elastomer having a hardness HDA50 to 85 (JIS K7215) which is harder than the hollow seal portion (2).

Next, as the thermoplastic elastomer or foam thereof used in the present invention, an olefin-based or styrene-based thermoplastic elastomer is used, and the hardness is HDA50 (JIS K7215) or less.
As the hard synthetic resin of the thin film layer (4), HDA90 (JIS K7215) or higher olefin resin such as polyethylene and polypropylene, or styrene resin is used.
Furthermore, the hard synthetic resin has a rough surface portion on the surface depending on the degree of melting of the mixed olefin resin by using two or more types of mixed olefin resins having different melt viscosities or two or more types of mixed olefin resins having different melting temperatures. Sometimes it forms.

  It is a vertical side view of the weather strip by which the hollow seal part of this invention is shape | molded integrally.   It is a vertical side view which shows the state by which the conventional weather strip was mounted | worn with the flange and was compressed by the opening-and-closing panel.   It is sectional drawing of the other Example which attached the thin film layer to the whole inner periphery of the hollow seal part of this invention.   It is sectional drawing of the other Example which similarly adhered the some thin film layer to the inner surface side of the hollow seal part of this invention.   It is a slope view of the core material used for this invention.   It is a side view which similarly shows the shaping | molding method of the extrusion molded product of this invention.   It is sectional drawing of the other Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Weather strip 2 Hollow seal part 3 Mounting part 4 Thin film layer 5 Outer peripheral covering body 6 Inner peripheral covering body 7 Core material 8 Holding piece 9 Diameter part 10 Opening and closing panel 11 Car body panel 12 Flange 13 Cutting part 15 First extrusion molding machine 16 Second extrusion molding machine 17 Mold die 18 Cooling tank 19 Take-up machine

Claims (2)

  In a method for forming a weather strip having a core material to be attached to an opening of a vehicle body such as an automobile door, trunk and window, the weather strip is formed by a hollow seal portion in a longitudinal direction and a mounting portion attached to a vehicle body panel. A thermoplastic elastomer for molding a weather strip or a foam thereof is injected into the first extrusion molding machine, and a hard synthetic resin is injected into the second extrusion molding machine. Thereafter, the first extrusion molding machine After simultaneously operating the second extrusion molding machine, the inner peripheral surface of the hollow seal portion is made of the hard synthetic resin of the second extrusion molding machine within 0.05 mm or less inside one mold die. A method for forming a weather strip for an automobile, wherein the thin film layer is thermally fused to a part of the longitudinal direction or the entire inner peripheral surface, and then sent out through a cooling tank.   The thin film layer according to claim 1, wherein a plurality of the thin film layers are heat-sealed in a longitudinal direction with a predetermined interval provided on an inner peripheral surface of the hollow seal portion. Weather strip forming method.

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