JPH11227543A - Weather strip and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a weather strip and its manufacture capable of preventing an appearance quality from lowering, reducing a production cost, and increasing a workability. SOLUTION: A weather strip 11 is formed with an extrusion molded part 13 formed of Ethylene-Propylene-Diene copolymer (EPDM) by extrusion forming and a mold formed part 14 which is connected to the extrusion molded part 13 and formed of EPDM by a metal mold forming. A pressure sensitive adhesive double coated tape 12 is stuck on the inner peripheral surfaces of the weather strip 11, and the waist strip is attached to a door frame with the pressure sensitive adhesive double coated tape 12. The surfaces of the mold formed part 14 is painted so that an appearance identical to that of the extrusion molded part 13 is presented. In this case, the surfaces of the extrusion formed part 13 are kept formed by extrusion forming, and any uncomfortable feeling is not produced on the appearances of the extrusion molded part 13 and the mold formed part 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weather strip comprising an extruded portion formed by extrusion, and a molded portion connected to the extruded portion and formed by die molding. It relates to a manufacturing method.

[0002]

2. Description of the Related Art Conventionally, a weather strip is attached to a peripheral edge of a door to seal a gap between the door and a mating member such as an opening of a vehicle body. In the case of such a weather strip, the straight portion is mainly formed into a predetermined shape by extrusion molding, while the corner portion and the terminal portion are formed into a predetermined shape by die molding. This type of weather strip is attached to the vehicle body using, for example, a double-sided adhesive tape made of a resin material.

FIG. 5 is a partial perspective view schematically showing the appearance of a weather strip attached to a door frame of a vehicle body. As shown in FIG.
Is mainly formed by an extruded portion 102 corresponding to a linear portion (coarse portion of a dotted pattern in the figure) and a molded portion 103 connected to the extruded portion 102 and corresponding to a corner portion (a dotted portion in the diagram). (A dense part of the pattern). The extruded part 102 of the weather strip 101 is made of, for example, a rubber material EP.
It is formed by extrusion molding with DM (ethylene-propylene-diene copolymer), and the molding part 103 is also formed by die molding with EPDM of a rubber material, for example, similarly to the extrusion molding part 102.

[0004] A double-sided adhesive tape 104 is adhered to the inner peripheral surface of the weather strip 101.
1 is attached to the door frame. In this manner, when the door frame is closed with respect to the vehicle body in a state where the weather strip 101 is attached to the door frame, a hollow sealing portion of the weather strip 101 is formed between the door frame and the vehicle body. And the like.

[0005]

However, the weather strip 101 has the following problems. That is, the E
The PDM and the EPDM constituting the molded part 103 may have slightly different materials even if they are the same EPDM material for convenience of molding. In this case, as shown schematically in FIG. 5, the appearance of the weather strip 101 is indicated by a dotted pattern, and the appearances of the surfaces of the extruded portion 102 and the molded portion 103 are different from each other. Therefore, when the weather strip 101 (especially, the design surface) is visually recognized from the outside, an uncomfortable feeling is generated, the appearance of the weather strip 101 as a whole is deteriorated, and there is a possibility that the appearance quality is deteriorated.

Therefore, in order to prevent the appearance quality of the weather strip from deteriorating, it is conceivable to apply a coating to the entire surface of the weather strip (the extruded part and the molded part).
However, in this case, since the amount of the paint used for the coating becomes large, the production cost is increased and the workability is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to prevent a reduction in appearance quality, reduce manufacturing costs and improve workability. An object of the present invention is to provide a weather strip that can be manufactured and a manufacturing method thereof.

[0008]

In order to achieve the above object, according to the first aspect of the present invention, there is provided an extruded portion formed by extrusion molding, and an extruded portion connected to the extruded portion and formed by die molding. The gist is that the surface of the molded portion is coated with a coating having the same appearance as the surface appearance of the extruded portion.

Further, in the invention according to claim 2,
An extruded part formed by extrusion, and a method for producing a weather strip comprising a molded part connected to the extruded part and formed by die molding, wherein a surface of the molded part is The gist of the present invention is to apply a coating having an appearance similar to the surface appearance of the extruded portion.

[0010] Further, according to a third aspect of the present invention, in the method for manufacturing a weather strip according to the second aspect, the gist is that the coating is performed by spray coating.

According to the first aspect of the present invention, the weather strip is formed by extrusion molding, and is connected to the extrusion molding section and is formed by die molding. And at least a part thereof are visually recognized from the outside.

[0012] Here, since the surface of the molded part is coated with the same appearance as the surface appearance of the extruded part, the surface appearance of the extruded part and the molded part is extruded. There is no difference between the part and the molded part. Therefore, when the weather strip is visually recognized from the outside, an uncomfortable feeling does not occur and the appearance is improved.

Further, since a coating having the same appearance as that of the surface of the extruded part is applied only to the surface of the molded part, the paint used for the coating is less than in the conventional case. The amount is not large, and the painting area is small.

According to the second aspect of the present invention, a weather strip having the effects of the first aspect of the present invention can be reliably obtained. Further, according to the third aspect of the present invention, in addition to the effect of the second aspect of the present invention, since the coating is performed by spray coating, the coating work on the surface of the molded portion can be simplified. Can be

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. However, the weather strip according to the present embodiment is attached to a door frame (not shown) of the vehicle body, and FIG. 1 shows a portion of the weather strip corresponding to a vicinity of a corner of the door frame. It is a perspective view. The one shown in FIG. 1 is attached to the front door on the left side of the vehicle. 2 is a sectional view taken along line AA of FIG. 1, and FIG. 3 is a sectional view taken along line BB of FIG.
It is a line sectional view. FIG. 4 is a partial perspective view schematically showing the appearance of the weather strip of FIG.

As shown in FIG. 1, the weather strip 11
A double-sided adhesive tape 12 is adhered to the inner peripheral surface of the weather strip 11.
Is attached to the outer periphery of the door frame.
The weather strip 11 mainly includes an extruded portion 13 provided at a straight portion, and a molded portion 14 (hatched portion in the figure) connected to the extruded portion 13 and provided at a corner portion. Here, the extruded portion 13 of the weather strip 11 is formed by extrusion using, for example, EPDM (ethylene-propylene-diene copolymer) of a rubber material. Similarly to the extrusion molding section 13, the molding section 14 is also formed by die molding using, for example, EPDM made of a rubber material.

As shown in FIG. 1 and FIG.
Has a base portion 15 attached to the door frame, and a seal portion 17 extending outward from the base portion 15 and having a hollow portion 16 inside. The double-sided adhesive tape 12 is attached to the lower surface of the base 15. A lip 18 is formed integrally with a part of the seal 17. In addition, at the corner portion of the weather strip 11, the sealing portion 1 is formed.
7 is cut out, and the extruded portion 13 extending in the horizontal direction and the extruded portion 13 extending in the vertical direction in the figure are connected only by the bottom plate 15 a of the base 15.

Further, as shown in FIG.
Has a seal portion 19 formed on the bottom plate portion 15a of the base portion 15, and a lip portion 20 and a receiving rib 21 are formed in a part of the seal portion 19. The sealing portion 19 (and its lip portion 20) is
3 has substantially the same shape as the seal portion 17 (and its lip portion 18). A gap is provided between the receiving rib 21 and the bottom plate 15a of the base 15, and the gap communicates the hollow portion 22 in the seal portion 19 with the outside. This is a gap for removing a core (not shown) used for molding the seal portion 19 with a mold after molding, and the shape of the hollow portion 22 matches the shape of the core.

Further, as shown in FIG. 4, in the weather strip 11 of the present embodiment, the surface of the molded portion 14 is coated with a coating so as to have the same appearance as the surface appearance of the extruded portion 13. It has been subjected. More specifically, the surface of the extruded portion 13 remains in a state formed by extrusion, and a paint is applied to the surface of the molded portion 14 so as to have the same surface appearance as the extruded portion 13. I have. In this case, the paint may adhere to not only the surface of the molded part 14 but also a part of the surface of the extruded part 13 near the molded part 14.

Examples of the paint used for the coating include a silicone-based paint [as an example of a component, a reactive silicone (hydroxyl-modified dimethylpolysiloxane, methylhydrogenpolysiloxane), a silane coupling agent, and carbon black with a solvent. Dissolved in certain toluene].

Next, a procedure for manufacturing the weather strip 11 configured as described above will be described. However, since an existing device or the like used for such manufacturing is used, illustration is omitted here.

First, an unvulcanized EPDM having a cross-sectional shape of the extruded section 13 is extruded using an extruder, vulcanized by a vulcanizer, and then cooled. Then, the double-sided adhesive tape 12 is attached to the bottom plate portion 15a of the base portion 15 except for the corner portion and its vicinity. Thus, the long E-shaped adhesive tape 12 is adhered to the double-sided adhesive tape 12.
A PDM (extruded part before cutting) is formed.

Next, the EPDM is cut according to the size of the door frame. Further, in a portion corresponding to a corner portion of the weather strip 11, the seal portion 17 is cut off in a range of about 10 to 15 cm,
The two extruded portions 13 sandwiching the corner are connected only by the bottom plate 15a of the base 15. Note that the operation of attaching the double-sided adhesive tape 12 may be performed after the sealing portion 17 is cut off. In this way, the extruded part 13 shown in FIG. 1 (the part excluding the hatched part in the figure)
Is obtained.

Thereafter, the extruded portion 13 is moved along the bottom plate portion 15a so as to correspond to the corner shape of the door frame.
Only the bend is set in a predetermined mold, the unvulcanized EPDM is injected into a cavity formed by the mold, and the unvulcanized EPDM is vulcanized. Immediately after this, the surface of the molded portion 14 is spray-painted by utilizing heat during the molding and vulcanization. In addition,
At this time, not only the surface of the molded part 14 but also the molded part 1
The paint may also adhere to a part of the surface of the extruded part 13 near 4. As a result, the paint used for painting is
It adheres to the surface of the molded part 14 and is cured.
The surface appearance of the molded part 14 is the same as that of the extruded part 13.
Surface appearance. Then, by sticking the double-sided adhesive tape 12 to the corner and its vicinity,
The final weather strip 11 (FIG. 4) is obtained. Note that the operation of attaching the double-sided adhesive tape 12 is performed in the molding section 1.
4 may be performed only once on the inner peripheral surface of the extruded section 13 after the connection is formed with the extruded section 13.

Then, when the weather strip 11 is used, when the door frame is closed with respect to the vehicle body, the seal portions 17, 19 of the weather strip 11 contact the vehicle body. At this time, the sealing parts 17, 19
It flexes and seals between the door frame and the vehicle body.

According to the weather strip 11 of the present embodiment described in detail above, the following effects can be obtained. (1) As shown in FIG. 4, the appearance of the weather strip 11 is schematically illustrated by a dotted pattern. Since the surface appearance of the extruded part 13 and the molded part 14 is not different between the extruded part 13 and the molded part 14 because the coating is applied so as to give the same appearance as that of the extruded part 13. Therefore, when the weatherstrip 11 (especially, the design surface) is visually recognized from the outside, a feeling of strangeness does not occur, the appearance of the weatherstrip 11 as a whole is improved, and a deterioration in appearance quality can be prevented.

(2) In the present embodiment, since a coating having the same appearance as that of the surface of the extruded portion 13 is applied to the surface of the molded portion 14, a comparison with the conventional case is made. Then, the amount of the paint used for the coating does not become large, and the coating area can be reduced. Therefore,
The manufacturing cost of the weather strip 11 can be reduced, and the workability can be improved.

(3) Further, in the present embodiment, the paint may adhere to the surface of the extruded part 13 near the molded part 14 in addition to the surface of the molded part 14. Similarly to the above, there is no difference in appearance between the surface of the extruded portion 13 and the surface of the molded portion 14 in the vicinity.

(4) In addition, in the method of manufacturing the weather strip 11 of the present embodiment, it is possible to reliably obtain the weather strip 11 capable of exhibiting the effects described in the above (1) to (3). Can be.

(5) In addition, in the method of manufacturing the weather strip 11 according to the present embodiment, in addition to the effect described in the above (4), the coating is performed by spray coating. The simplification of the painting work on the surface of No. 14 can be achieved.

The present invention is not limited to the above-described embodiment, and may be implemented as follows, with a part of the configuration being appropriately changed without departing from the spirit of the invention. In the above embodiment, the two extruded portions 13 sandwiching the corner portion are connected by the bottom plate portion 15a of the base portion 15, but the connecting portions are omitted and the edges of the extruded portions are connected by the molded portion. You may do so.

In the above embodiment, the extruded portion 13
And the molded part 14 are formed in a predetermined shape as shown in the figure, but the shape may be any shape and is not particularly limited. For example, it is also possible to form one extruded portion continuously by variable extrusion and connect one molded portion to both ends of the extruded portion, thereby forming an annular weather strip. Good. Also,
It is desirable that the size of the molded portion be as small as possible. In the case of such a configuration, the number of portions to be coated on the surface of the molded portion is reduced, so that the manufacturing cost of the weather strip can be further reduced.

In the above-described embodiment, the entire surface of the molded portion 14 is coated, but the coating may be applied only to the portion that can be seen from the outside of the vehicle when the door is closed.

The extruded part 13 and the molded part 1
The material of No. 4 is the rubber material EP described in the above embodiment.
It is not limited to DM at all. For example, any material may be used as the extruded portion 13 as long as it can be extruded. In addition, any material can be used as the molded portion 14 as long as it can be molded. Those [for example, TPO (olefin-based thermoplastic elastomer)] may be employed.

In the above embodiment, a silicone-based paint is used as the paint. However, it is possible to apply a paint having the same appearance as the surface appearance of the extruded part 13 to the surface of the molded part 14. As the paint, for example, a urethane-based paint [eg, a one-pack type urethane paint containing a polyester polyol, an isocyanate, and a primer (modified natural rubber)] may be used. Absent.

In the above-described embodiment, spray coating is employed as a coating method. Instead of the spray coating, the coating is applied to the inner surface (cavity surface) of the mold, and then the mold is formed. Sometimes, the paint may be transferred to the surface of the molded part, and a coating method may be adopted such that the surface of the molded part has the same appearance as the surface appearance of the extruded part. Even when such a coating method is employed, similarly to the above-described embodiment, the surface of the molded portion can be coated with the same appearance as the surface of the extruded portion. In addition, as a coating method, any coating method that can surely apply a coating exhibiting an appearance equivalent to the surface appearance of the extruded part 13 to the surface of the molded part 14 can be used. It is not limited to the coating method.

In the above embodiment, the weather strip 11 is attached to the door frame by the double-sided adhesive tape 12. However, if the weather strip 11 can be securely attached to the door frame, for example, a clip may be used. Or a retainer may be used, and is not particularly limited to the double-sided adhesive tape 12. Further, if the weather strip 11 can be securely attached to the door frame, the double-sided adhesive tape 12 may be partially used or the double-sided adhesive tape 12 may be omitted.

In the above embodiment, the weather strip 11 of the type attached to the door frame is embodied. However, other weather strips (for example, the type of weather strip attached to the hood of the vehicle body or the like). The strip).

[0039]

As described above in detail, according to the weather strip of the first aspect of the present invention, it is possible to prevent the appearance quality from being deteriorated, to reduce the manufacturing cost and to improve the workability. It has an excellent effect that it can be performed.

Further, according to the method for manufacturing a weather strip according to the second aspect of the invention, it is possible to reliably obtain a weather strip exhibiting the effects of the first aspect of the invention. Further, according to the method for manufacturing a weather strip of the invention described in claim 3, in addition to the effect of the invention described in claim 2, it is possible to simplify the painting operation on the surface of the molded portion.

[Brief description of the drawings]

FIG. 1 is a partial perspective view showing a weather strip attached to a door frame of a vehicle body according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a partial perspective view schematically showing the appearance of the weather strip of FIG. 1;

FIG. 5 is a partial perspective view schematically showing an appearance of a weather strip attached to a door frame of a vehicle body in the related art.

[Explanation of symbols]

11 weather strip, 13 extrusion part, 14 mold part.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takao Nakajima 1 Ochiai Nagahata, Kasuga-machi, Nishi-Kasugai-gun, Aichi Prefecture Toyota Gosei Co., Ltd. Toyoda Gosei Co., Ltd.

Claims (3)

[Claims] 1. A weather strip comprising: an extruded part formed by extrusion molding; and a molded part connected to the extruded part and formed by die molding, wherein a surface of the molded part is provided. , A coating having an appearance similar to the surface appearance of the extruded portion is provided. 2. A method for producing a weather strip, comprising: an extruded portion formed by extrusion molding; and a molded portion connected to the extruded portion and formed by die molding. A method for producing a weatherstrip, comprising applying a coating having an appearance similar to the surface appearance of the extruded part to the surface of the part. 3. The method according to claim 2, wherein the coating is performed by spray coating.