| 摘要 |
PURPOSE:To increase the bonding strength of sheets by high-frequency seaming by bonding a polymer having a high-frequency fusing property to a sheet consisting of strands having no high-frequency fusing property so as to sufficiently increase the strength of the core portion without melting. CONSTITUTION:A comparatively large meshed sheet, obtained by knitting and braiding strands having no high-frequency fusing property, is bonded with a polymer having high-frequency fusing property to form a high-frequency-seamable large meshed sheet. In this case, the sheet is pulled in the advancing direction 14 by holding its both edges 11 and 12 in such a way that its center 13 moves behind both edges 11 and 12, and the strands are arranged circularly in vertical or sidewide direction. These sheets 1 and 2 are bonded with each other at their selvadges to obtain sheets having a great bonding strength and a great tortional strength and having suitability for structures. |
