JPH0616094A - Weather strip - Google Patents

Abstract

PURPOSE:To provide a weather strip readily matched to a color tone inside a car and possessed of soft feeling. CONSTITUTION:A weather strip 10 mounted on the door opening peripheral edge part of a car body by means of a support 1ip 14 is exposed inside a car, ranging from its hollow sealing part 24 base to the end of its interior member W. In this range, structure is made by laminating an ornamental skin material 20, cushioning layer 18, and a rubber base 12 in that order from the inside of the car. The cushioning layer 18 is formed of sponge rubber having high foaming and flexibility. The ornamental skin material 20 is previously colored to meet the color tone of the interior member W and is firmly stuck to the rubber 12 through a laminated film 22 thermal deposition on the production line for the weather strip 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weather strip for a vehicle, which is based on solid rubber.

[0002]

2. Description of the Related Art A weather strip for a vehicle is attached to a peripheral portion such as a door opening of a vehicle and seals a gap between a body and a door to prevent rainwater, dust, noise, etc. from the outside. It is used. Generally, the base of the weather strip is made of various solid rubbers and has a dark color of black.

In recent years, there has been a demand for higher-grade vehicles and higher added value, and it is possible to add a color that matches the color tone of the room or a soft feeling to the exposed portion of the weather strip. Has been done. For example, the actual Kosho 5
9-17709 proposes a technique of integrally forming sponge rubber on a substrate and implanting hair on the surface of the sponge rubber.

[0004]

However, even if the above conventional technique is applied to a weather strip, the following problems have been pointed out. Since the color of the sponge rubber is also black like the substrate, it is necessary to increase the flocking density of the colored short fibers in order to match the exposed portion of the weather strip with the color tone of the vehicle interior. In particular, when the color tone of the vehicle interior is light, it is unavoidable to further increase the flocking density of the light-colored short fibers. That is, it is necessary to change the flock density in the process of the production line according to the color tone of the vehicle interior, and the adjustment is complicated. Although it is possible to add a pigment to the sponge rubber to make the color lighter, it is necessary to adjust, combine or change the pigment to form the sponge rubber, which is complicated. Also, reinforcing fillers other than carbon black must be used.
Therefore, the cost is increased and it is not a practical solution.

Further, in order to transplant the hair, masking is required, or in order to change the color to a different color, it is necessary to remove the short fibers of the used color in the process of the production line. A lot of labor is required for this color changing work such as masking and removal of short fibers. In addition, if the removal of the short fibers of the colors used up to that time is insufficient, the resulting flock will be a mixture of short fibers of the old and new colors. When such a situation occurs, the color tone of the flocking area becomes uneven with the old and new colors, and does not match the color tone of the vehicle interior, leading to deterioration in product quality. Further, the production efficiency of the production line is reduced by the amount required for the color changing work.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a weather strip that is easy to match with the color tone of a vehicle interior and has a soft feeling.

[0007]

Means for Solving the Problems The means adopted by the present invention in order to achieve the above object is a weather strip for a vehicle using a solid rubber as a base, which is provided in an area of the base exposed in the vehicle compartment. Is a cushion layer that includes a decorative skin material that covers the base body, and is depressed between the decorative skin material and the base body in accordance with an external force from the decorative skin material side and returns to its original shape by releasing the external force. It is the gist to have established.

[0008]

The weather strip having the above structure has a structure in which the decorative skin material, the cushion layer, and the base body are laminated in this order from the vehicle interior side in the region of the base body exposed in the vehicle interior. The cushion layer between the base body and the decorative skin material is designed to be depressed by following an external force from the decorative skin material side and to return to its original shape by releasing the external force, so that the cushion layer provides a soft feeling. can get. On the other hand, in order to match the color tone of the vehicle interior, the decorative skin material may be appropriately colored in advance according to the color tone.
Therefore, it is possible to match the color tone of the vehicle interior regardless of the shade of the vehicle interior. Further, when changing the color to a different color, it suffices to replace it with a decorative skin material having a different color.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the weather strip according to the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a weather strip (weather strip door opening trim) 10 of the embodiment.

As shown in FIG. 1, a weather strip 10
Includes a rubber base 12 made of solid rubber having a U-shaped cross section, and a support lip 14 protruding inside the rubber base 12. A plate-shaped insert member 16 for holding the U-shape is embedded in the rubber base 12.
As shown in FIG. 2, the weather strip 10 is attached to the peripheral edge of the door opening D of the automobile body B by a support lip 14.

The area of the rubber base 12 on the vehicle interior side is a cushion layer 18 made of highly foamed sponge rubber.
And is covered with the decorative skin material 20. The decorative skin material 20 is previously colored in a color that matches the color tone of the vehicle interior. The decorative skin material 20 is adhered to the rubber base 12 and the cushion layer 18 via the laminated film 22 for heat welding, the details of which will be described later.

In addition, the weather strip 10 is provided with a hollow seal portion 24 made of sponge rubber for sealing on a side portion of the rubber base 12. Further, on the side opposite to the hollow seal portion 24, an outer lip 26 projecting to the outside of the rubber base 12 is provided so as to come into pressure contact with the interior member W on the vehicle interior side. The range from the base of the hollow seal portion 24 to the end of the interior member W is the range exposed in the vehicle compartment. The cushion layer 18 and the hollow seal portion 24 are formed integrally with the rubber base 12.

Next, a method of manufacturing the weather strip 10 will be described. Prior to this, the rubber substrate 12,
The decorative skin material 20 and the laminated film 22 will be described in detail.

The rubber base 12 is a non-polar polymer E
It is composed of PDM and its composition is as follows. Mixing amount (parts by weight) EPDM Note 1) 100 MAF carbon black 130 Paraffinic process oil 100 Zinc white 5 Stearic acid 1 Dehydrating agent (CaO) 5 Vulcanization accelerator 3.5 Sulfur 2 Note 1) “JSREP 57C” Japan Synthetic Rubber Co., Ltd., trade name

Here, EPDM refers to an ethylene-α-olefin-non-conjugated diene copolymer rubber typified by ethylene propylene diene ternary rubber. That is, ethylene, α-olefin (for example, propylene), the third
As a component, a small amount of non-conjugated diene such as ethylidene nobornene, dicyclopentadiene, and 1,4-hexadiene is added and copolymerized to introduce a double bond into a side chain so that sulfur vulcanization is possible. This EPDM usually contains auxiliary materials such as a reinforcing filler (carbon black), a plasticizer, a lubricant, and a vulcanizing agent.

The decorative skin material 20 is a woven fabric made of polyester fiber preliminarily colored in a color matching the color tone of the interior member W on the vehicle interior side. In addition, a resin sheet material such as PVC that can be easily colored may be used.

The laminated film 22 for adhering the decorative skin material 20 to the EPDM rubber substrate 12 is
It has the following configuration. As shown in FIG. 3, the laminated film 22 is formed by laminating a first film 22a that contacts the rubber base 12, the cushion layer 18 and the outer lip 26 and a second film 22b that contacts the decorative skin material 20. It is a film.

The first film 22a is made by introducing a polar functional group into a nonpolar olefin resin. That is, the first film 22a has adhesiveness to EPDM due to the original property of the olefin resin (compatibility with EPDM). Also, by introducing a polar functional group,
It also has adhesiveness to resins such as polyethylene and nylon. Examples of polar functional groups that impart such properties include carboxyl groups, hydroxyl groups, amino groups, halogen groups, and acrylic groups.

In producing the first film 22a, Admer (manufactured by Mitsui Petrochemical Industry Co., Ltd .: trade name), which is an olefin resin having polar functional groups, and Bond First (Sumitomo Chemical Co., Ltd .: product) Name) and Modic (Mitsubishi Petrochemical Co., Ltd .: trade name) can be used.

On the other hand, the second film 22b is a thermoplastic resin which is made of a resin having polarity and melts by heating. Since the second film 22b itself has polarity, it adheres to the first film 22a having a polar functional group introduced therein. Also, due to its own polarity, it adheres to the decorative skin material 20 which is a woven fabric made of polyester fiber. That is, the second film 22b has a property of adhering to both the first film 22a and the decorative skin material 20.

Chemit R-2, which is a copolyester resin, is used in the production of the second film 22b.
48 (manufactured by Toray Industries, Inc .: trade name) can be used. In addition, nylon (N (PA)), polyethylene (PE), polypropylene (PP), polystyrene (P
S), polyvinyl alcohol (PVA), polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), ethylene vinyl alcohol copolymer, ionomer (I
The second film 22b can also be manufactured from ONOMAER) or the like.

The first film 22a in the weather strip 10 of this embodiment is a film using an olefin resin Admer (Mitsui Petrochemical Co., Ltd .: trade name), and the second film 22b is a copolymer. A polyester resin, Chemit R-248 (trade name, manufactured by Toray Industries, Inc.). The thickness of each of these films is adjusted to be 50 μm and 30 μm, respectively.

As a method for forming such a laminated film 22, a well-known extrusion lamination method, dry lamination method, wet lamination method, hot melt lamination method, two-layer inflation method or the like can be used. Among them, the extrusion lamination method, which is the most preferable method for manufacturing the laminated film 22, uses the T-shaped die provided at the tip of the extruder to remove the molten resin materials of the first film 22a and the second film 22b. By co-extruding,
A wide film is laminated and formed. In addition, the dry lamination method is a method in which separately molded films are bonded with an adhesive in a separate step.

Next, a method of manufacturing the weather strip 10 will be described with reference to the schematic view of the production line in FIG. As shown in FIG. 4, first, extrusion molding is performed. A crosshead type extruder 30 was used for the extrusion molding.
That is, the cylinder 3 filled with the EPDM material having the above composition
2 and cylinders 34 and 3 filled with sponge rubber material
The EPDM material, the sponge rubber material and the core material 38 are simultaneously extruded from 6 and the core material extruder 40 accommodating the core material 38 serving as an insert member, respectively, so-called co-extrusion is performed. The extrusion speed at the time of coextrusion was set to 5 m / min.

That is, the EPDM material is extruded from the cylinder 32 and becomes the rubber base 12 later, and the cylinder 34
The sponge rubber material is extruded from the cylinder 36 to form the cushion layer 18, and the sponge rubber material is extruded from the cylinder 36 to form the hollow seal portion 24 later. in this case,
As the sponge rubber material for the cushion layer 18 and the hollow seal portion 24, EPDM to which a foaming agent was added was used to add flexibility. A plate material made of iron was used as the core material 38 of the insert member 16.

By this coextrusion, the extrusion molded body 42 shown in FIG. 5 was extrusion molded. The extruded body 42 is to be the weather strip 10 through a post-process described later.
The hollow seal portion 24 is integrally provided. Of these, the hollow seal portion 24 has substantially the same shape as the final shape, and the cushion layer 18 has a shape in which both sides thereof are raised from the center.

Next, vulcanization treatment was performed. This process is
The extruded body 42 was mainly passed through a microwave heating device (UHF) 44 for heating and a hot air vulcanizing device (HAV) 46 for mainly keeping heat. This vulcanization treatment is performed at a temperature suitable for vulcanizing EPDM of 180 ° C to
It may be carried out at 240 ° C., and in this embodiment, 200 ° C. × 5
Minutes were processed.

Subsequently, an adhesion process was performed. That is, in this step, the decorative skin material 20 to which the laminated film 22 is adhered
Was carried out from the roller 48, and in the residual heat state immediately after vulcanization, the decorative skin material 20 was welded to the surface of the rubber substrate 12 by the pressure bonding roller 50. At this time, as shown in FIG. 5, the laminated film 22 has the first film 22a on the rubber substrate 12 side and the second film 22b on the decorative skin material 20 side to bond the decorative skin material 20. Be served.

After being pressed by the pressure bonding roller 50, the decorative skin material 20 is bonded to the rubber substrate 12 via the laminated film 22, as shown in FIG. On this occasion,
The decorative skin material 20 adheres to the rubber base 12 on the base side of the hollow seal portion 24, adheres to the cushion layer 18 while slightly pressing the cushion layer 18, and also adheres to the outer lip 26. When the hollow seal portion 24 and the outer lip 26 are adhered to the periphery of the base, the pressure roller 5 is used.
Bonded following the shape of 0. Further, when the outer lip 26 is adhered to the tip portion, it is adhered to the tip portion by a pressure roller (not shown) downstream of the pressure roller 50 so as to cover the tip portion.

Adhesion between the decorative skin material 20 and the rubber substrate 12 or the like with the laminated film 22 interposed is such that the first film 22a depends on the original property of the olefin resin (compatibility with EPDM), as described above. The EPDM rubber substrate 12 and the outer lip 26 are adhered to each other to form the second film 22.
b is adhered to both the first film 22a and the decorative skin material 20 by virtue of its own polarity and the introduction of the polar functional group into the first film 22a.

Subsequently, the extruded body 42 after vulcanization, to which the decorative skin material 20 is adhered, is cooled by the cooler 52,
Further, the weather strip 10 shown in FIG. 1 is completed by bending with a processing machine 54 into a U-shaped cross section.

As described above, according to the weather strip of this embodiment, as shown in FIG.
Regarding the range exposed from the base to the end of the interior member W in the vehicle compartment, the decorative skin material 20, the cushion layer 18, and the rubber base 12 are laminated in this order from the vehicle compartment side, and the cushion layer 18 is made higher. Since the cushion layer 18 is formed from foamed sponge rubber having flexibility, a soft feeling can be obtained. On the other hand, only by changing the decorative skin material 20 to another decorative skin material having a color matching the color tone of the interior member W on the vehicle interior side, the range exposed in the vehicle interior is changed to the shade of the vehicle interior. You can match regardless. In addition, when changing the color to a different color, it is only necessary to replace it with the decorative skin material 20 having a different color, and there is no need to adjust the flocking density or change the color as in the conventional case. Therefore, according to the weather strip 10 of the present embodiment, matching with the color tone in the vehicle interior becomes easy. At this time, since it is not necessary to stop the production line, the production efficiency can be maintained.

By the way, at the time of pressing through the pressure roller 50 and bending into a U-shaped cross section by the processing machine 54, the cushion layer 18 is applied by the tension acting on the decorative skin material 20.
Both sides of the cushion layer are crushed excessively, so cushion layer 1
So-called sagging occurs on both sides of 8. When this sagging occurs, it looks bad. However, in the weather strip 10 of the present embodiment, as described above, the sides of the cushion layer 18 are raised from the center in anticipation of this sag.
The cushion layer 18 was formed integrally with the rubber base 12. As a result, according to the weather strip 10 of the present embodiment, the occurrence of sagging on both sides of the cushion layer 18 can be avoided and the appearance can be improved.

Next, the peeling test performed on this weather strip 10 after leaving it at room temperature for 24 hours will be described. That is, from each part of the weather strip 10 (bonding site between the rubber substrate 12 and the decorative skin material 20, bonding site between the cushion layer 18 and the decorative skin material 20), as shown in FIG. 73 was cut out, and the tip of the adhered member 77 corresponding to the decorative skin material 20 was pulled in the arrow direction with respect to the base material 75 corresponding to the rubber base 12 or the cushion layer 18 at a pulling speed of 100 mm / min. . The peel strength at this time is that the base material 75 is the rubber base 12
If it is, the base material 7 is applied with a load of 1.5 kg / 5 mm.
5 was broken, and when the base material 75 was the cushion layer 18, the base material 75 was broken under a load of 1.0 kg / 5 mm. That is, by adhering the decorative skin material 20 and the EPDM rubber base 12 via the laminated film 22 that adheres to the rubber base 12 and the decorative skin material 20, respectively, the adhesive strength thereof can be improved.

Besides, according to the weather strip 10 of the embodiment, the following effects can be obtained. Since the adhesion treatment between the rubber base 12, the cushion layer 18 and the like and the decorative skin material 20 is performed on a series of production lines in the preheated state of the rubber base 12 and the like immediately after vulcanization,
It has excellent productivity. Since the residual heat during vulcanization is used as the energy for heat welding in the adhesive treatment, it also contributes to energy saving. Since the steps such as the buffing process and the coating process with an adhesive etc. which are necessary when directly bonding the decorative skin material 20 to the rubber substrate 12 without using the laminated film 22, the production line is shortened, Equipment is simplified. Since heat welding is used, no adhesive is needed,
Therefore, cost reduction can be realized. Since the adhesive does not penetrate into the cushion layer 18, the flexibility of the cushion layer 18 is not impaired.

Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment and can be implemented in various modes without departing from the scope of the present invention. Of course.

For example, although the cushion layer 18 is formed of sponge rubber having high foaming and flexibility, the cushion layer 18 may have a structure as shown in FIG. That is, as shown in FIG. 8, the flexible projections 62, 64, 66, 68 are formed on the rubber substrate 1 by extruding the EPDM material which is the same material as the rubber substrate 12.
2 may be integrally formed, and the aggregate 70 of the flexible protrusions may be used as a cushion layer instead of the cushion layer 18. Each of the flexible projections follows the external force from the decorative skin material side and bends to return to its original shape by releasing this external force.
0 gives a soft feeling like the cushion layer 18. Then, as shown in the drawing, the flexible protrusions 62, 68 on both sides
Has a height higher than that of the central flexible protrusions 64 and 66. FIG. 9 shows a cross section of the weather strip 10 completed by using the aggregate 70. Even with the weather strip 10 having such a configuration, as in the above-described embodiment, the weather strip 10 has a soft feeling and can be easily matched with the color tone in the vehicle interior.

Further, although the cushion layer 18 is formed of a highly foamed sponge rubber, it may be formed of a foam material such as soft polyurethane, polyester or PVC. Further, as the decorative skin material 20, a woven fabric made of polyester fiber which has been colored in advance is used, but not limited to the woven fabric, a resin sheet material such as polyester, polyvinyl chloride (PVC), nylon or urethane is used. be able to. Since each of these resins is easily colored, it is easy to make the color match the color tone of the vehicle interior. In addition, a sheet material in which flocking is applied to the surface of the resin sheet can be used as the decorative skin material 20. In this case,
Since the hair can be preliminarily planted in a facility separate from the production line of the weather strip 10, it is not necessary to perform a color changing operation such as removal of short fibers at the time of color changing on the production line. Therefore, unlike the conventional case to which the technique of Japanese Utility Model Publication No. 59-17709 is applied, it is possible to easily change the color only by replacing the decorative skin material 20 on which the hairs of different colors are applied. Moreover, at this time, since it is not necessary to stop the production line,
Colors can be changed without affecting production efficiency.

[0039]

As described above in detail, according to the weather strip of the present invention, in the region of the substrate exposed in the vehicle compartment, the decorative skin material, the cushion layer, and the substrate are laminated in this order from the vehicle interior side. Since the cushion layer has a structure and is depressed to follow an external force from the decorative skin material side and returns to its original shape by releasing the external force, a soft feeling can be obtained. On the other hand, only by changing the decorative skin material to a color having a color matching the color tone of the vehicle interior, the region of the base body exposed in the vehicle interior can be matched with the color tone of the vehicle interior regardless of its shade. In addition, when changing colors, it is only necessary to replace the decorative skin material with a different color, and there is no need to adjust the flocking density or change colors as in the conventional case. Therefore, according to the weather strip of the present invention, matching with the color tone in the vehicle interior becomes easy.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a weather strip 10 according to an embodiment.

FIG. 2 is a schematic perspective view of a front surface of a door opening D of an automobile body B used for explaining a mounting location of a weather strip 10.

FIG. 3 is a cross-sectional view used to explain the structure of a laminated film 22.

FIG. 4 is an explanatory view showing a production line in the weather strip 10 of the embodiment.

FIG. 5 is a sectional view showing an extruded body 42 obtained on a production line.

FIG. 6 is an explanatory diagram for explaining how the decorative skin material 20 is bonded.

FIG. 7 is an explanatory view for explaining a peeling test of the decorative skin material 20.

FIG. 8 is a cross-sectional view used to describe a modified weather strip 10.

FIG. 9 is a cross-sectional view used to describe a modified weather strip 10.

[Explanation of symbols]

 10 Weather Strip 12 Rubber Substrate 16 Insert Member 18 Cushion Layer 22 Laminated Film 24 Hollow Seal Part 26 Outer Lip 30 Extruder 44 Microwave Heating Device (UHF) 46 Hot Air Vulcanizing Device (HAV) 50 Pressing Roller 52 Cooler 54 Processing Machine 70 Aggregate W Interior member

Claims (1)

[Claims] 1. A weather strip for vehicles using solid rubber as a base material, wherein a region of the base material exposed in the vehicle compartment is provided with a decorative skin material for covering the base material. A weather strip, characterized in that a cushion layer is provided between the base and the base body, the cushion layer being recessed following the external force from the decorative skin material side and returning to its original shape by releasing the external force.