JP2533910B2 - Weather strip manufacturing method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weather strip for automobiles, and more particularly to a method for manufacturing a weather strip having a decorative cloth adhered to the surface thereof for decoration of a vehicle interior.

2. Description of the Related Art For example, in a weather strip having a hollow sponge seal portion on the side surface of a welt portion having a substantially U-shaped cross section, usually, the welt portion is extruded together with a core metal using a synthetic resin material, Separately from this, the extruded hollow sponge seal part is continuously joined to the extruded welt part to manufacture. When joining the sponge seal portion, a method is known in which a hot melt adhesive is applied in advance to the surface of the welt portion or the back surface of the sponge seal portion and the heat of extrusion is used to integrally join them (special feature). (Kaisho 58-168544).

As an interior welt for vehicle interior, there is a welt made by extrusion molding rubber or synthetic resin, the surface of which is covered with a decorative cloth. Even in this case, the hot melt adhesive is previously applied to the back surface of the decorative cloth. A method is known in which the heat of extrusion is used to integrally bond the elements (Japanese Patent Laid-Open No. 58-158216).
Issue).

On the other hand, for example, when it is desired to further cover a weather strip having a hollow sponge seal portion on the side surface of the welt portion with a decorative cloth, the sponge seal portion separately molded is first extruded with a hot melt adhesive. The heat strip was used to bond to the welt part, and after cooling to complete the weather strip body, an adhesive was applied to the surface on another line to bond the decorative cloth. . Further, when a decorative cloth coated with a hot melt adhesive is used, it is necessary to reheat the weather strip body formed by joining the sponge seal portions to heat the surface to which the decorative cloth contacts.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the conventional manufacturing method in which the sponge seal portion and the decorative cloth are joined independently of each other as described above, the adhesive is reapplied or weathered. There is a drawback that work efficiency is poor because an intermediate treatment such as reheating of the strip body is required.

Means for Solving the Problems The present invention has been made to solve the above problems, and joins a sponge seal portion and a decorative cloth,
The heat is applied at the time of extrusion for continuous operation.

That is, the method for manufacturing a weather strip according to the present invention includes a step of extruding a welt portion together with a core metal using a synthetic resin material, and a sponge seal portion separately formed and having a back surface previously coated with a hot melt adhesive. The step of pressing and joining to a part of the surface of the welt part, and a decorative cloth previously coated with a hot-melt adhesive on the back surface of the sponge seal part at least outside the sponge seal part. And a step of pressing the surface of the welt part to bond the sponge seal part and the decorative cloth to the molded product.

Alternatively, a step of extruding a welt portion together with a core metal using a synthetic resin material and simultaneously applying a hot melt adhesive to a necessary portion of the surface and a sponge seal portion separately formed are bonded to the above welt portion. A step of pressing and joining to a part of the agent application surface, a decorative cloth is overlapped at least on the outside of both side edges of the sponge seal part on the sponge seal part, and pressed on the adhesive application surface of the welt part. The method includes a step of joining and a step of cooling the molded article to which the sponge seal portion and the decorative cloth are joined.

Action In the above method, the sponge seal portion is first bonded to the surface of the extruded welt portion itself by heat. Then, subsequently to this, the decorative cloth is joined to the surface by utilizing the heat of the welt portion itself. Here, the decorative cloth is disposed so as to overlap the sponge seal portion, but the decorative cloth is not joined to the surface of the sponge seal portion itself, and the welt portion is formed on the outer side of both side edges of the sponge seal portion. The surface and the decorative cloth are joined together.

Example First, an example of the weather strip 1 manufactured by the manufacturing method of the present invention will be described with reference to FIG.
The weather strip 1 has a welt portion 2 having a substantially U-shaped cross section and a hollow sponge seal portion 3 joined to the side surface of the welt portion 2, and the core metal is inside the welt portion 2. 5 is buried. The welt portion 2 is made of synthetic resin such as vinyl chloride, and the sponge seal portion 3 is made of a rubber foam.
The sponge seal portion 3 used is extruded into a hollow cross-sectional shape as shown in the figure. And
A decorative cloth 4 is attached continuously from the outer surface of the welt portion 2 to the outer surface of the sponge seal portion 3.

The welt portion 2 is extruded in a substantially L-shaped expanded state (see FIG. 2), cooled, and finally bent into the illustrated sectional shape.

FIG. 1 is an explanatory view showing an embodiment of a method for manufacturing a weather strip according to the present invention, in which 11 is a welt portion 2
An extruding machine for extruding the sponge into a predetermined cross-sectional shape; 12 is a seal sizing portion for pressing the sponge seal portion 3 separately formed to the extruded welt portion 2 for joining;
Reference numeral 13 denotes a cloth-applied sizing portion for pressing and joining the strip-shaped decorative cloth 4 to the welt portion 2 integrated with the sponge seal portion 3. The seal sizing portion 12 is a sizing jig as shown in detail in FIG.
14 having a guide roller 15 and a guide roller 15, and a die of the extruder 11.
It is located immediately after 16. Cloth sizing part 13
Similarly has a sizing jig 17 and a guide roller 18, and is arranged immediately after the seal sizing portion 12.

That is, the extrusion molding machine 11, the seal sizing unit 12, and the cloth pasting sizing unit 13 are sequentially arranged on the same manufacturing line, and in the subsequent stage, a water tank 19 as a cooling step,
A take-up machine 20 and a drainer 21 by blowing air are sequentially arranged.

In addition, a roll coater 22 for applying a hot melt adhesive to the back surface of the sponge seal portion 3 is provided in the supply path of the sponge seal portion 3 that is supplied to the seal sizing portion 12. A dryer 23 for drying the adhesive is provided.

Similarly, in the supply path of the decorative cloth 4 supplied to the cloth pasting sizing unit 13, a roll coater 24 and a dryer for applying a hot melt adhesive to the back surface of the decorative cloth 4 are provided.
Next, the manufacturing method will be described along the flow of the line. First, in the extrusion molding machine 11, the welt portion 2 is extruded together with the core metal 5 using a synthetic resin material. At the time of this extrusion, as is well known, the synthetic resin material is in a high temperature state close to the melting point. Then, the sponge seal portion 3 is pressed in the seal sizing portion 12 on the surface of the welt portion 2 thus pushed out. Since the hot melt adhesive is applied to the back surface of the sponge seal portion 3 in advance, the sponge seal portion 3 is bonded to the surface of the welt portion 2 by utilizing the heat of the welt portion 2 itself.

Then, the decorative cloth 4 is sequentially pressed in the cloth-applied sizing portion 13 on the surface of the welt portion 2 which is integrated with the sponge seal portion 3 in this manner. Since the hot melt adhesive is applied to the back surface of the decorative cloth 4 in advance, the decorative cloth 4 is also joined by utilizing the heat of the welt portion 2 itself. Here, since the sponge seal portion 3 is not heated, the decorative cloth 4 does not adhere to the surface of itself, but as is apparent from FIG.
Since the sponge seal portion 3 is overlapped with the outside of both side edges of the sponge seal portion 3, the welt portion 2 is provided on both sides of the sponge seal portion 3.
It will adhere to the surface. Therefore, in appearance, the decorative cloth 4
Just as in the case where the adhesive is interposed between the sponge seal portion 3 and the sponge seal portion 3, the decorative cloth 4 is finely attached to the outer surface of the weather strip 1.

Then, the weather strip 1 with the decorative cloth 4 attached to the outer surface is guided into the water tank 19 and cooled there.

Next, FIG. 3 is an explanatory view showing a different embodiment of the present invention.

In this manufacturing method, the sponge seal portion 3 and the decorative cloth 4 do not need to be coated with a hot melt adhesive,
It is directly supplied to the seal sizing unit 12 and the cloth sizing unit 13. Then, the necessary hot melt adhesive is applied to the outer surface of the welt portion 2 at the same time as the extrusion molding at the die 16 portion of the extrusion molding machine 11.

4 and 5 are a perspective view and a cross-sectional view showing the details of the mouthpiece 16 portion. The mouthpiece 16 has a main mouthpiece having a passage portion 31 having a predetermined sectional shape corresponding to the welt portion 2. 32 and a coating die 33 which is arranged on the outside of the main die 32 so as to be overlapped with each other.
Is formed with an opening. As shown in FIG. 4, a hot melt adhesive pressing machine 36 is connected to the adhesive inlet 35 communicating with the adhesive supply passage 34.

That is, when the hot melt adhesive is supplied from the adhesive supply passage 34 at the same time as the extrusion molding of the welt portion 2, the hot melt adhesive is continuously applied to the outer surface of the molded welt portion 2. is there.

The above manufacturing method will be described along the flow of the line. First, in the extruder 11, the welt portion 2 is extruded together with the core metal 5 using a synthetic resin material, and at the same time, the outer surface of the welt portion 2 is formed. Hot melt adhesive is applied. The hot melt adhesive is applied corresponding to the attachment area of the decorative cloth 4 shown in FIG. Then, on the surface of the welt portion 2 provided with this hot melt adhesive, the sponge seal portion 3 in the seal sizing portion 12 is provided.
Is pressed. At this stage, since the welt portion 2 is in a high temperature state, the sponge seal portion 3 is joined with the hot melt adhesive. Next, cloth pasting sizing section 13
At, the decorative cloth 4 is sequentially pressed. Even at this stage, since the welted portion 2 is still in a high temperature state, the decorative cloth 4 is joined by the hot melt adhesive. Here, since the surface of the sponge seal portion 3 is not coated with the adhesive, the decorative cloth 4 does not adhere to itself, but the sponge seal portion 3 is adhered to the welt portion 2 on both sides as in the above-described embodiment. Therefore, the external appearance is in a state of being properly attached.

EFFECTS OF THE INVENTION As is apparent from the above description, according to the weather strip manufacturing method of the present invention, the sponge seal portion and the decorative cloth can be continuously joined in the same line, and particularly, the intermediate Since it is not necessary to re-apply the adhesive or re-heat the process, it is possible to extremely easily manufacture a highly decorative weather strip formed by sticking a decorative cloth on the surface.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the manufacturing method according to the present invention, FIG. 2 is a perspective view showing an essential part of the process, and FIG. 3 is an explanation showing a different embodiment of the manufacturing method according to the present invention. 4 and 5 are a perspective view showing a die portion of an extrusion molding machine in this embodiment, FIG. 5 is a sectional view showing the same principal part, and FIG. 6 is a sectional view showing an example of a weather strip manufactured. 2 ... Welt part, 3 ... Sponge seal part, 4 ... Decorative cloth, 11 ... Extruder, 12 ... Seal sizing part,
13 …… Cloth sizing section, 19 …… water tank.

Claims (2)

(57) [Claims] 1. A step of extruding a welt portion together with a core metal using a synthetic resin material, and a sponge seal portion separately formed and having a hot melt adhesive applied in advance on the back surface of the welt portion. A step of pressing and joining to a part, and a decorative cloth previously coated with a hot melt adhesive on the back surface are overlapped with the sponge seal portion so as to extend over at least the outer edges of both side edges of the sponge seal portion, and the welt portion A method for producing a weather strip, comprising: a step of pressing and joining the surfaces to each other; and a step of cooling the molded article to which the sponge seal portion and the decorative cloth are joined. 2. A step of extruding a welt portion together with a core metal using a synthetic resin material, and simultaneously applying a hot melt adhesive to a necessary portion of the surface thereof, and a sponge seal portion separately formed by the above-mentioned welt. Part of the adhesive application surface of the sponge part is joined by bonding, and the decorative cloth is overlapped with the sponge seal part so as to extend over at least the outer side edges of the sponge seal part, and the adhesive application surface of the welt part. A method for producing a weather strip, comprising: a step of pressing and joining the sponge seal portion and a decorative cloth together to cool the molded article.