JPS6295217A - Manufacture of weather strip - Google Patents

Abstract

PURPOSE:To form a rough surface, produced by the trace of tearing, only at a predetermined place on the internal surface of a main body to improve bonding strength by a method wherein a non-foamed rubber material, forming the main body of a weather strip, and a sponge rubber material are formed alternately by extrusion and the sponge rubber material is removed by tearing it from the internal surface of the main body after vulcanizing to form the rough surface inside the main body. CONSTITUTION:A rubber material not including a foaming agent, and the rubber material added wit the foaming agent, are extruded integrally to obtain a weather strip W, in which the sponge rubber 5 is protruded in the shape of a protrusion on the bottom of the internal surface of a U-shape main body 1 provided with the seal sections 2, 3 of a sponge rubber on the outer surface thereof. Subsequently, the weather strip W is vulcanized, thereafter, the sponge rubber is teared to remove it from the main body 1, whereby a rough surface 5a, the trace of tearing the sponge rubber off, is formed on the bottom of the internal surface. An adhesive agent 6 is applied on the internal surface of the main body which is including the rough surface 5a, and the outer peripheral part of a glass G is inserted into the main body of the weather strip, whereby the weather strip W can be mounted to the outer peripheral section of the glass G.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a weather strip that is attached along the outer periphery of glass, and in particular has a U-shaped cross-sectional shape, and is fitted onto the outer periphery of the glass. The present invention relates to a method of manufacturing a weather strip that is bonded with an adhesive.

[Prior Art J] Figure 4 shows a weather strip attached to the outer periphery of the glass G of a sunroof of an automobile.
and a lip-shaped seal portion 3, which contacts the periphery of the opening of the roof panel R to perform a sealing action.

In the weatherstrip W, the main body 1 is fitted over the outer periphery of the glass G, and the outer periphery of the glass G and the inner surface of the weatherstrip main body 1 are bonded via an adhesive 6.

Incidentally, the glass G is often opened and closed by grasping the weather strip, and the weather strip W may fall off during long-term use. This is because the inner surface of the weather strip W is smooth and the adhesive strength with the adhesive is insufficient.

As a measure to prevent this falling off, the inner bottom surface of the weather strip W is made into a rough surface 4a as shown in FIG. 6 by using a rotary buff roller 7 having a gold brush 71 etc. attached to the outer periphery as shown in FIG. is commonly practiced. In this surface roughening, a buff roller 7 is installed on the conveyance path of the formed weatherstrip W, and the weatherstrip W is sequentially processed. Then, in addition to the intended rough surface 4a, the gold brush 71 of the buff roller 7 often comes into contact with the outer surface of the weatherstrip W, forming a rough surface 4b in that area, which changes the appearance of the weatherstrip W. be damaged.

[Problems to be Solved by the Present Invention] Therefore, the present invention provides a weatherstrip in which only the inner surface of the weatherstrip to which an adhesive is applied is roughened, and the roughening does not extend to the outer surface of the weatherstrip. The purpose is to provide a manufacturing method and thereby solve the problems of the conventional method.

[Means for Solving the Problems] As shown in FIGS. 1 and 2, the present invention includes integrally extruding and processing a sponge rubber 5 on at least a portion of the inner surface of a weather strip W having a U-shaped cross section. The sponge rubber 5 is torn and removed from the main body 1 after sulfurization, and a rough surface 5a is formed by the tear marks.

[Operations and Effects] According to the present invention, a rough surface due to tear marks is reliably formed only at predetermined locations on the inner surface of the weatherstrip body 1, thereby improving adhesive strength, and the outer surface is not roughened. .

[Example] A rubber material that does not contain a foaming agent, for example, EPDM and a rubber material in which a foaming agent is added to the same type of rubber, is integrally extruded to form a sponge rubber seal portion 2.3 on the outer surface as shown in FIG.
Sponge rubber 5 on the bottom of the inner surface of the U-shaped body with
Obtain a weather strip W@ that protrudes like a protrusion. Next, this i-feather strip W is passed through a vulcanization tank and vulcanized. After vulcanization, the sponge rubber 5 is torn and removed from the main body 1 as shown in FIG. This tearing can be carried out, for example, by providing a sponge rubber take-up machine on the side of the weatherstrip taken up by the weatherstrip take-up machine, and using this to take off the sponge rubber 5 in a direction different from the direction in which the weatherstrip travels.

The thus obtained weatherstrip W has a rough surface 5a formed from the sponge rubber removal marks on the bottom of its inner surface.

Rough surface 5a of weatherstrip W obtained in this way
By applying adhesive 6 to the inner surface of the main body including
is installed.

Since the adhesive 6 is bonded to the weather strip W via the rough surface 5a having a large bonding area, it has excellent bonding strength. Note that the end surface of the glass G is a rough surface and has excellent adhesive strength with the adhesive 6, so that the weather strip W attached to the glass will not fall off during use.

In addition, the method of forming a rough surface on a weatherstrip according to the present invention is easy to work with, and can form a rough surface at a desired location on the weatherstrip. There's nothing to lose.

[Brief explanation of drawings]

1 to 3 show embodiments of the present invention; FIG. 1 is a cross-sectional view of the weatherstrip in an extruded state; FIG. 2 is a diagram showing the state in which the sponge rubber is torn and removed from the weatherstrip; FIG. 3 is a cross-sectional view showing how the weather strip obtained according to the present invention is attached to the outer periphery of the glass;
Fig. 4 is a cross-sectional view showing a conventional weather strip attached to the outer periphery of the glass, Fig. 5 is a view showing a conventional surface roughening means, and Fig. 6 is a cross-sectional view of a conventional weather strip after surface roughening. It is a diagram. W...Weather strip q...Glast...Weather strip body 4a, 4b...Rough surface of conventional weather strip 5...Sponge rubber 5a... Rough surface of weather strip formed according to the present invention 6... Adhesive Figure 1 Figure 3 Figure 5 Figure 2 $4 Figure 6

Claims (1)

[Claims] A weather strip that is attached along the outer periphery of the glass, and whose main body is U-shaped in cross section, into which the outer periphery of the glass is fitted, and the outer periphery of the glass and the inner surface of the weather strip are joined via adhesive. In the manufacturing method, a non-foamed rubber material forming the main body and a sponge rubber material bonded to at least a part of the inner surface of the main body are integrally extruded, and after vulcanization, the sponge rubber is torn and removed from the inner surface of the main body. A method for producing a weather strip, characterized in that a rough surface is formed by tearing marks from sponge rubber.