| 摘要 |
Process for creating a hinge-forming line of weakness on a plastic sheet and product obtained by this process. The invention relates to a process enabling a plastic sheet to be folded about a predetermined line and for this sheet to be able to be folded a very large number of times. This process consists in welding, using a high-frequency or ultrasonic process, along the desired line of weakness I on the rigid plastic sheet F, a flexible plastic sheet E and in thinning down the rigid plastic sheet F along the entire length of the line I. The process according to the invention is particularly intended for the manufacture of stationery and packaging articles. <IMAGE> |
