| 摘要 |
PURPOSE:To obtain sheets having more reliable sealing part and less influenced by circumferential heat upon heat welding by holding non-bridged polyethylene tape comprising peroxide and poly-functional monomer between opposite faces of axially enlarged sheet of bridged polyethylene. CONSTITUTION:Between opposite faces of axially enlarged sheets 1 comprising ethylene polymer such as nonbridged polyethylene or ethylene-vinyl-acetate copolymerization, preferably after removing grease, a tape 2 consisting of non-bridged polyethylene or non-bridged polyethylene copolymerization mingled with peroxide such as dicumyl peroxide and poly-functional monomer such as dialic phtaletate is inserted. Then, heat resistant adhesive tape 3 is adhered to a contact part and its circumference of the sheet 1. Thus, the ends of the sheets are settled each other and position of the tape is determined. In the above condition, press and heating are applied from the surface of the adhesive tapes 3, 3 to connect both ends. |
