| 摘要 |
PROBLEM TO BE SOLVED: To surely avoid lowering of the strength of a welded part. SOLUTION: The bag making machine has a sealing part 1 for welding a film 6 for making a bag, a cutting part 2 for cutting the film 6 after it is welded and a feeding part 5 for feeding the film to be cut 2. In this machine, a slackened part 6a of the film 6 is made to exist intermediately between the sealing part 1 and the feeding part 5. Then a tensile force acting on the film 6 when the film 6 is fed out to the cutting part 2 is intercepted by the slackened part 6a. Therefore no tension acts on the film at the sealing part and the lowering of the strength of the welded part is avoided. |
