Patent ID: 8578587

Claim:
A method for producing a weather strip, the method comprising: an extrusion step for extruding a non-vulcanized and non-foamed rubber into a predetermined shape; a coating step for coating a treatment liquid containing a simple sulfur, a sulfur compound, or both of the simple sulfur and the sulfur compound on an outer surface of a sealing part of a non-vulcanized and non-foamed intermediate molded body that is molded by the extrusion step; and a vulcanizing and foaming step for forming a skin layer in a non-foamed state by heating and vulcanizing a surface of the treatment liquid, and forming a sponge layer by vulcanizing and foaming the non-vulcanized and non-foamed rubber that is internal from the skin layer by passing the intermediate molded body on which the treatment liquid has been coated during the coating step through a heating zone, the steps being performed when molding an extruded part, wherein the coating step is performed by using: a spraying unit for spraying the treatment liquid at least on the outer surface of the sealing part of the intermediate molded body; and a masking unit for covering parts other than the sealing part of the intermediate molded body, wherein the extruded part includes: the sponge layer; and the skin layer that is formed on an outer surface of the sponge layer, the sponge layer and the skin layer comprising the same rubber with different sulfur concentrations, such that the skin layer has a hardness which is greater than a hardness of the sponge layer, wherein the skin layer is formed by uniformly applying the treatment liquid and includes a contact part for contacting a mating member and has a width of 10 mm or more in a direction of a width of the extruded part and a uniform thickness set in a range of 0.04 mm to 0.15 mm, and wherein the masking unit comprises a wall part disposed between parts other than the sealing part of the intermediate molded body and the spraying unit so that the parts other than the sealing part and the spraying unit are shielded from each other.