JPH0647360B2 - Weather strip - Google Patents

Description

TECHNICAL FIELD The present invention relates to a weather strip having an assembling portion and a sealing portion, particularly a weather strip suitable for use in an automobile, and a manufacturing method thereof. It is used in the field of molding rubber and plastic materials.

[Conventional technology]

BACKGROUND ART Automotive weather strips such as door weather strips and so-called drip moldings have conventionally been formed by extrusion molding into a linear material with a solid rubber assembly part and a sponge rubber seal part. However, it has been practiced to integrally connect the connection portion of the extrusion molded product by molding.

FIG. 5A is an example of a conventional weather strip for an automobile door, in which the extrusion molding portion 1 has an insert iron plate 14 for imparting shape retention in the core and a holding lip 13 in the form of solid rubber. The extruded assembly portion 12 formed in step 1 and the extruded seal portion made of sponge rubber are integrally formed at the joining line 10. For example, a corner of the extruded seal portion is connected to the die seal portion 21 as well. The mold assembly part 22 is also integrally connected by injecting sponge rubber and molding.

FIG. 5B shows an example of a conventional automobile drip molding. In the extrusion molding section 1, an extrusion assembly section 12 formed of solid rubber and an extrusion seal section 11 made of sponge rubber are integrated at an extrusion joining line 10. It is molded. Since the sealing function is prioritized between the joint ends 20 of the extrusion molded portion 1,
Both the die-molding seal portion 21 and the die-molding assembly portion 22 are die-molded with the same solid rubber as the extrusion assembly portion 12 and are integrally connected.

That is, in a conventional weather strip for an automobile provided with an assembling portion and a sealing portion, in the extrusion molding portion, solid rubber is used for the assembling portion and sponge rubber is used for the sealing portion, and the required functions are provided for each. However, since the joint part is integrally molded by molding, the molding part is made of the same material as the assembly part or the sealing part. It was molded from material.

[Problems to be Solved by the Invention]

When the mold molding part 2 is formed of sponge rubber, the extrusion molding part 1
Although the step at the joint end portion 20 with and can be reduced and the sealing property is satisfied, the vulcanization time becomes long, the cost becomes high, and the combination of the extrusion molding part 1 and the mold molding part 2 is increased. Due to the difference in the material of the attachment part, the appearance and holding force of the assembly part were impaired.

Further, if the mold forming part 2 is formed of solid rubber, the appearance and holding force of the assembling part will be satisfactory and the cost will be low, but the sponge rubber of the mold and the seal part that was pressed at the joint end during molding However, due to the difference in the sealing action between the sponge rubber and the solid rubber, a uniform sealing function could not be obtained.

The present invention provides a novel weatherstrip which alleviates the above-mentioned defects all at once, and a method which enables the production of the novel weatherstrip.

[Means and Actions for Solving the Problems]

The invention according to claim 1 is, for example, as shown in FIGS. 1A and 3B of the embodiment, of an assembly portion 12 of solid rubber which requires rigidity and shape retention and a sponge rubber which requires elastic adhesion function. Extrusion molding unit 1 in which the seal unit 11 and the extrusion unit are integrally molded
Between the joint ends 20 on both sides of the mold forming means, the mold forming assembly portion 22 is substantially the same solid rubber as the extrusion assembly portion, and the mold forming seal portion 21 is formed. Apply sponge rubber that is substantially the same as the extrusion seal part 11,
The portion of the base of the die-molding seal portion, which is thinned by the contact of the die projection edge at the time of molding, is also replaced with solid rubber.

Therefore, regarding the seal portion, both the extrusion molding portion 1 and the die molding portion 2 are continuous bodies of the same sponge rubber material, and regarding the assembly portion, both the extrusion molding portion 1 and the die molding portion 2 are continuous solid rubber materials. Since it becomes a body, the joint end 2 at the seal part
The step difference at 0 can be made small, and the thin part of the base part of the mold sealing part is a solid rubber material, so it has sufficient shape retention. Therefore, a uniform sealing action can be achieved over the entire sealing part. In both, the appearance and holding power of both the extrusion-molded portion and the die-molded portion were substantially the same.

The invention according to claim 2 is, for example, as shown in FIG. 2, in the invention according to claim 1, when forming the joining end portion of the extrusion-molded portion 1, it is extended to only the assembly portion by a step cut. After the portion E is formed, the joining ends 20 of the extrusion-molded portions on both sides are molded and connected by the molding means.

Therefore, in the case where the insert iron plate is put in the assembly part at the time of extrusion molding, the extension part E can be set by bending the insert iron plate into the shape of the corner part which performs the mold forming connection, and the insert iron plate allows the connection corner part to be connected. It was possible to add rigidity and firm shape retention.

The invention according to claim 3 is for suitably manufacturing the weather strip of each of the above-mentioned inventions, and is, for example, the third aspect.
As shown in FIG. A, the ends of the extrusion molding parts 1 on both sides are set in the mold for molding, and the molding seal part 21 and the molding assembly part 2 are set.
The protrusion 71 is provided at the position of the mold forming the connection part with the two, and the sponge rubber for the seal part and the solid rubber for the assembly part are properly supplied from the injection port 8 and the injection port 9 respectively. It is injected so as to be integrally molded, and while the protrusion 71 resists the flow of solid rubber into the sponge rubber,
The sealing portion 21 and the assembling portion 22 are molded at the same time by molding the solid rubber up to the position of the protruding edge 71.

Therefore, the joint between the sponge rubber seal member and the solid rubber assembly member, which have different physical properties due to the flow resistance of the projecting edge 71 of the mold, has a uniform boundary in which the solid rubber slightly exudes to the base of the seal member. Can be formed, and since the thin portion of the base of the sealing member formed by the projecting edge is also solid rubber, the sealing action of the sealing portion can be performed without any trouble, and the weather strip according to claim 1 or 2 can be formed. It became so.

〔Example〕

[Example 1] A conventional molded product was used for the extrusion molding part. That is, the extrusion assembly part 12 having a retaining lip 13 for retaining the flange on the inner surface and having the insert iron plate 14 inserted therein is made of solid rubber, and is attached to the outside of one side surface of the assembly part at the joining line 10. The tubular seal portion 11 in the form was integrally formed of sponge rubber, and a molded product obtained by extrusion molding with a general wall thickness of 2 mm was used.

Next, as shown in FIGS. 3A and 3B, the joint ends 20, 20 on both sides of the extrusion molding part 1 are placed on the lower mold 4 so that the general wall thickness W becomes 2 mm and the mold molding cavity is sandwiched. And place
The first medium dies 5 on the back, the assembly middle dies 6 having a length corresponding to the length of 100 mm between the joining ends at the front, and the projecting edge having a height H of 1 mm and a protrusion length P of 1 mm at the lower end of the tip. The middle mold 7 of the assembling part and the middle mold 7 of the sealing part having the same length 71 are overlapped, and the upper mold 3 clamps the mold.

Next, the same sponge rubber paste as the sponge rubber of the seal part 11 of the extrusion molding part is injected from the injection port 8 for the seal part, and the same sponge rubber of the assembly part 12 of the extrusion molding part is injected from the injection port 9 for the assembly part. Both of the solid rubber pastes were simultaneously injected under pressure through the channels 81 and 91. After the vulcanization and molding, the upper mold 3 was removed and each of the middle molds was removed. As a result, a weather strip joined to the shape shown in FIG. 1A at the molding part 2 was obtained. In the obtained weather strip, the joining state of the assembling part 22 and the seal part 21 in the mold forming part 2 is such that the solid rubber on the assembling part side presses the sponge rubber on the seal part side. Then, the joining line 10 'of the die-molded portion entered the sponge rubber side by R (a little more than 1 mm) than the joint line 10 of the extrusion-molded portion. As a result, the thinned portion is replaced with the slid rubber, and therefore, the portion thinned by the protrusion length P (1 mm) of the mold projecting edge 71 of the sponge rubber seal portion having a general wall thickness of 2 mm is effectively the sponge rubber. Therefore, it became a solid rubber with much higher rigidity, so there was no hindrance to the sealing action of the sponge rubber seal part.

Further, the seal part 11 of the extrusion molding part 1 is in the form of a tube of sponge rubber, and the seal part 21 of the mold molding part 2 is the middle mold 7.
Although there is a narrow slit opening O for pulling out, the seal portion 21 has no trouble in operation. However, the opening O can be adhesively closed as required.

Further, since the seal portion 21 of the die-molded portion 2 is a sponge rubber that is homogeneous with the seal portion 11 of the extruded-molded portion 1, the step at the joint end portion 20 of the product was inconspicuous.

In the obtained product, the sealing part and the assembling part are made of the same material for both the extrusion molding part 1 and the mold molding part 2, so that the sealing part exerts a uniform sealing action without forming a gap throughout. In the assembling part, the appearance was exactly the same even though there was no insert iron plate only in the mold forming part, and there was no problem in operation.

[Example 2] As shown in Fig. 2, the same extruded product as in Example 1 was used, but at one joint end of the extruded part 1, only the assembly part was step-cut to form an extension E. . That is, it was carried out in the same manner as in Example 1 except that E was 90 mm out of the total length L of the mold forming section 2 of 100 mm and the mold forming section length L of the assembling section was 10 mm.

In the obtained weather strip, since the insert iron plate is present in most of the assembling parts of the corner part to be connected by molding, it has a strong assembling holding force at the corner part. The same effects as in Example 1 were obtained except that

[Other]

If Example 1 is applied to a conventional automobile drip molding,
It is obvious to those skilled in the art that the preferred drip molding shown in FIG. B can be obtained, and the same effect as the weather strip of the door of FIG. 1A can be obtained.

Further, in the present invention, since the assembling part and the seal part of the mold forming part can be made of the same material as those of the extruding part, the assembling part and the seal part are required in the weather strip for automobiles. Any color effect can be added.

It will be apparent to those skilled in the art that each invention of the present application can be applied to a weather strip having two or more kinds of various lips made of materials having different physical properties.

[Comparative example]

In Example 2, when a mold having no protruding edge 71 was used as the middle mold 7 for the seal portion, solids as shown in FIG. 4 caused R ₀ to enter the sponge rubber. In this example, E is 90 mm and L is 10 mm, but R ₀ reaches 8 mm, and the upper mold molding seal part 21 connected to the mold assembly part 22 is up to 8 mm of the connection part with the assembly part 22. Since the rubber is a solid rubber, rigidity is imparted and the sealing property of the sponge rubber as a sealing portion is obstructed, and the product cannot exhibit a uniform sealing action.

That is, the suitable weather strip according to claims 1 and 2 can be suitably manufactured by the method according to claim 3.

〔The invention's effect〕

Since both the seal part and the assembling part of the mold forming part are made of the same material as the seal part and the assembling part of the extrusion forming part, the joint end between the mold forming part and the extrusion forming part has a shape with less steps.
In addition, the thin portion formed by the metal mold ridge at the base of the mold molding seal has sufficient shape retention because it is replaced by the solid rubber of the assembly part, and therefore the entire seal part has a uniform seal. The function can be achieved and a sufficient holding function can be given to the assembling part of the mold forming part.

Further, it is possible to impart an appropriate color effect to the entire seal portion and the entire assembly portion of the weather strip.

Further, in the method of the present invention, the two-layer simultaneous molding of the sponge rubber seal portion and the solid rubber assembly portion is carried out to prevent the solid rubber from entering the seal portion by imparting flow resistance by the projecting edge of the mold. Due to the limitation, it is possible to integrally mold with a predetermined parting line, and since the thin portion of the base of the seal portion caused by the die rim is also solid rubber, it is possible to integrally mold without losing the shape retention of the seal portion.

[Brief description of drawings]

FIG. 1A is a perspective view of an essential part of a weather strip obtained according to the first embodiment of the present invention, and FIG. 1B is a perspective view of an essential part of another weather strip obtained according to the first embodiment of the present invention. is there. FIG. 2 is a perspective view of essential parts of a weather strip obtained by the second embodiment of the present invention. FIG. 3A is a schematic explanatory view of the manufacturing method of the present invention.
FIG. 3B is a sectional view taken along line 3B-3B in FIG. 1A. FIG. 4 is a perspective view of essential parts of a weather strip manufactured according to a comparative example. FIGS. 5A and 5B are conventional examples, FIG. 5A shows a weather strip corresponding to FIG. 1A, and FIG. 5B shows a weather strip corresponding to FIG. 1B. 1: Extrusion molding part, 2: Mold molding part, 3: Upper mold, 4: Lower mold, 5: First medium mold, 6: Assembly part medium mold, 7: Sealing part middle mold, 8: Sealing part injection port, 9 : Injection port for assembly part, 10: Extrusion joining line, 11: Extrusion seal part, 12: Extrusion assembly part, 13: Holding lip, 14: Insert iron plate, 20: Joining end part, 21: Mold forming seal part, 22: Molding assembly part, 71: Projection edge.

Claims (3)

[Claims] Claim: What is claimed is: 1. A solid rubber extruded assembly part (12) and a sponge rubber extruded seal part (11) are integrally extruded to form a space between the joining end parts (20) of the extruded parts (1, 1). A molding assembly part (22) made of a substantially uniform material for the extrusion assembly part (12), and a molding sealing part (21) made of a substantially uniform material for the extrusion seal part (11). A weather strip in which the thin portion of the base of the die seal portion by the die molding portion (2) is replaced by the solid rubber of the die assembly portion and is integrally joined. 2. The weather strip according to claim 1, wherein the joint end portion (20) of the extrusion-molded portion (1) is provided with an extension portion (E) formed by step-cutting the extrusion assembly portion (12). 3. A projecting edge (71) is provided at a position where a connecting part between a seal part (21) and an assembling part (22) is formed in a mold forming die,
Sponge rubber is injected from the injection port (8) for the seal part and solid rubber is injected from the injection port (9) for the assembly part, and a solid rubber mold is applied to the position of the projection edge while imparting flow resistance by the projection edge (71). A method for forming a connection portion of a weather strip, in which a sealing portion (21) and an assembling portion (22) are molded at the same time and the molding portion (2) is integrally molded between extrusion molded products.