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.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]This invention relates to a weather strip to be attached to a peripheral part of a door opening of a vehicle and the like as well as to a method for producing the same.[0003]2. Related Art[0004]In general, a weather strip is provided on a peripheral part of a door opening and a peripheral part of a door of a vehicle such as an automobile. The weather strip is provided with an attachment base (a trim part having a section in a substantially U-shape, for example) to be attached to an attachment part (flange, for example) provided on the vehicle door opening peripheral part and the vehicle door opening peripheral part and a sealing part provided as being projected from the attachment base and having a hollow part. When the door is closed, the sealing part is brought into pressure-contact with the door peripheral part, the door opening peripheral part, and the like, so that a seam between the door and the vehicle body is se...

AI Technical Summary

Benefits of technology

[0038]For example, in the case of employing a masking method wherein: an adhesive tape or the like is used as a masking means; the adhesive tape or the like is adhered to the part of the intermediate molded body that does not require the skin layer having the predetermined thickness; and the adhesive tape or the like is removed after coating the treatment liquid on the intermediate molded body, the step of adhering the adhesive tape or the like and the step of removing the adhesive tape or the like are required, thereby inviting a reduction in work efficiency. From this point of view, it is possible to prevent the probability of inviting the reduction of work efficiency according to Item 5, since Item 5 does not require such steps.

Problems solved by technology

However, it is in fact difficult to uniformly form a thin and wide solid layer made from a solid rubber on the superficial part by extruding.

Accordingly, there is a fear that the solid layer is increased in thickness leading to an increase in thickness of the sealing part to result in undesirably large increase in repulsion force (reactive force against the door) of the sealing part.

Though it is possible to achieve the solid layer thinner than that obtained by the simultaneous formation of the solid layer by employing the technology disclosed in JP-A-10-52867, the technology is not yet satisfactory since there is a fear for inviting the increase in reactive force in the case of the above-described sealing part.

Further, with the technology disclosed in JP-A-10-52867, there is a fear that, even when only the sealing part is irradiated with the electron beam with a region (trim part, etc.) except for the sealing part is being masked, the masked part such as a peripheral portion of the sealing part, for example, can be crosslinked in addition to the sealing part.

More specifically, since it is difficult to properly define the part to be hardened by the electron beam irradiation, there is a fear that the parts that do not require the increase in rigidity can be increased in rigidity.

Also, since an apparatus for the electron beam irradiation is required, an equipment cost can be remarkably increased.

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