Manufacture of head rest cover

Abstract

Abstract PURPOSE:To highten peel strength and to cause the insertion into a mold to be achieved easily by a method in which a parison is caused to be almost a frustum shape widened at its lower end side of a cylindrical shape as it is, and is inserted into a mold, and then its upper end side is cut and welded in a transverse width of a flatted prarison cylinder as it is. CONSTITUTION:A parison P is a cylindrical parison having a little thicker wall and yet a narrower width (l) and diameter than those of the parison P' utilized for molding the head rest cover with an ordinary width, and its lower end side is widened almost like a frustum shape. The width of the lower end side of the parison has the dimension t1 being able to recieve left and right valves, and its upper end side has the dimension t2 corresponding to the state in which the cylindrical shape of the parison, as it is, is flatted. Accordingly, the welding positions are made only at upper and lower two sides for achieving blow forming by inserting the parison of a cylindrical shape as it is into a mold, and yet its upper end side is sufficient to weld over the short side corresponding to the cylindrical parison only flatted, whereby peel strength may be increased. The assembling of the parison into the mold is also achieved very easily.

Inventors

• 👤 Tamotsu Shibata
• 👤 保 柴田
• 👤 Masahiro Miyazaki
• 👤 正弘 宮崎
• 👤 Hitoo Yoshimura
• 👤 吉村　仁雄

Bibliographic Details