SEAL MATERIAL FOR CAR AND METHOD FOR MANUFACTURING THE SAME

PROBLEM TO BE SOLVED: To provide a method for manufacturing a seal material having a hollow part for a car characterized in that the hole of the hollow part having an air vent hole formed thereto has good appearance and the strength of the hollow part is not damaged. SOLUTION: The air vent holes are formed at the hollow parts of weather strips 1 and 7 yet inferior to elasticity and held to a softened state by a punch type drilling machine 21 immediately after the strips are extruded from an extruder 14. After the air vent hole is formed, the weather strips 1 and 7 are vulcanized in a vulcanizing apparatus 15. The punch type drilling machine 21 comprises an air cylinder 24 and a drilling rod 25 moved up and down by the air cylinder 24, and the outside end of the hole formed by the drilling rod 25 is smoothed by the advance and retreat of the drilling rod 25 to show a rounded shape and, since a film layer is formed to the inner wall surface of the hole by sending the weather strips to the vulcanizing apparatus 15 to vulcanize the same after drilling, the strength of the hole edge is enhanced. COPYRIGHT: (C)2003,JPO