| 摘要 |
<P>PROBLEM TO BE SOLVED: To inhibit fault by twist deformation of a core chip when roll shaping a core material into U-shaped cross section, regarding the core material buried as a weather stripping. Ž<P>SOLUTION: After forming a plurality of slits at a given interval in a longitudinal direction of a raw core material by slit work and forming core chips 22 between respective slits, a core material 16 having core chips 22 and inter-spaces 24 alternately in longitudinal direction is formed by rolling the enlargement of the slits in longitudinal direction to form the inter-spaces 24. In this occasion, preliminary twist treatment is performed along with the slit work to force the core chip 22 a plastic deformation in a specific direction so that the plastic deformation of the core chip 22 twisted by the preliminary twist treatment may be corrected by a twisted deformation thereafter of the core chip 22 when the core material 16 is made into U-shaped cross section by roller forming work and width direction ends of core chips 22 may be aligned in longitudinal direction, thereby formation of step between edges of longitudinally adjacent core chips 22 is avoided. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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