Weather strip and production method for the same

Abstract

A weather strip has a trim part 5 to be attached to a peripheral part of a door opening corresponding to a door and a sealing part projecting from the trim part 5 and having a hollow part. The weather strip is obtainable by 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 the sealing part of an extruded, non-vulcanized, and non-foamed intermediate molded body and vulcanizing and foaming the intermediate molded body by passing the intermediate molded body through a heating zone. By the above production steps, in the trim part, a skin layer that is harder than a sponge layer is formed on the sponge layer and a superficial part of the trim part. The skin layer has a width of 10 mm or more in a width direction and a uniform thickness set in a range of 0.04 mm to 0.15 mm.

1 . A weather strip comprising:
 a sealing part provided along a peripheral part of a door of a vehicle or a peripheral part of a door opening of a vehicle and having a hollow part, the sealing part comprising an extruded part that is brought into contact with the door opening peripheral part or the door peripheral part when the door is closed,   wherein the extruded part comprises a sponge layer and a skin layer that is formed on a superficial part of an outer surface of the sealing part and harder than the sponge layer; and   the skin layer includes a contact part that is brought into contact with 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.   
   
   
       2 . A weather strip comprising:
 a trim part to be attached to an attachment part provided along a peripheral part of a door opening of a vehicle and having a substantially U-shaped sectional shape and a sealing part provided as being projected from the trim part and having a hollow part, the sealing part comprising an extruded part that is brought into contact with a peripheral part of the door when the door is closed, wherein   the extruded part comprises a sponge layer and a skin layer that is formed on a superficial part of an outer surface of the sealing part and harder than the sponge layer; and   the skin layer includes a contact part that is brought into contact with the door peripheral part 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.   
   
   
       3 . A method for producing the weather strip defined in  claim 1 , 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 the outer surface of the sealing part of the non-vulcanized and non-foamed intermediate molded body that is molded by the extrusion step; and   a vulcanizing and foaming step for forming the skin layer in a non-foamed state by heating and vulcanizing a surface of the treatment liquid coating and forming the sponge layer by vulcanizing and foaming the non-vulcanized and non-foamed rubber material 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 the extruded part.   
   
   
       4 . The weather strip production method according to  claim 3 , 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.   
   
   
       5 . The weather strip production method according to  claim 4 , wherein the masking unit is a wall part disposed between the 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.