| 摘要 |
PURPOSE:To provide a bonded molded portion which comprises a fitting portion and a sealing portion and of which the sealing function is not impaired, with a reduced number of steps and at low cost, by a method wherein an unvulcanized rubber is nipped between the bonding end portions of the members to be bonded and this assembly is heated and pressed between the upper and the lower molds to effect molding and bonding simultaneously. CONSTITUTION:A hollow doorstop rubber comprises a U-shaped fitting portion 3 made of solid rubber provided with a sealing portion 4 made of spongy soft rubber. Bonding end portions of the hollow doorstop rubber 10 are set in molds 11, 12. With the spacing between the bonding end portions set to be about 5mm. and with an unvulcanized rubber tape for adhesion inserted therebetween, the bonding end portions are pressed by the upper and lower molds 12, 11 and heated and vulcanized by a hot press. An excess of rubber flows into the hollow portions, the side walls adhere to each other to form a seal portion 4', and the end portions are mutually bonded rigidly. Since the crushed portion is very small in length and only slightly changed from the original cross-sectional shape, the compressive strength as to the contact surface 4c is almost the same as that of the original cross section and the appearance is not damaged. |
