| 摘要 |
PURPOSE:To equalize sufficiently also heat-sealing strength of respective lateral sealing parts leaving a space between them by making the lateral sealing part of a bag have almost uniform heat-sealing strength over its whole length. CONSTITUTION:Fixing side and movable side roll body parts 1, 5 wherein two rolls make a pair and are driven by rotation in a revers direction with each other, and heat-sealing edges 10, 11 which are provided to such respective roll body parts 1, 5, extended in their length directions or peripheral directions, and have a peripheral arc state surface, are provided in a heat sealer. A forcing means 14 which energizes the movable side roll body part 5 toward the fixing side roll body part 1 always by specific force, and besides an elastic means 15 which pushes the movable side roll body part 5 back in a direction separating from the fixing side roll body part 1 are arranged. The pushing back force of the elastic means 15 is reduced within a range of 2-8kgf per 10mum according to increase in a nip from a balance posture between the pushing back force and the energizing force of the forcing means 14. |
