Patent ID: 9120279
Filing Date: 2015-09-01
Classification: B29C,B29D,B29L,B65D

Abstract:
1. A method for producing thermoformed articles, comprising food packagings or parts thereof, with a mechanical weakening between adjoining functional areas, separated at least partly from each other at the mechanical weakening when utilized by a user, the thermoforming being provided by a thermoforming die with an upper die and a lower die moving against each other, the method comprising: feeding a plastic sheet between the upper die and the lower die; thermoforming the fed plastic sheet by closing the upper die and the lower die in a direction of movement of at least one of the dies; wherein the mechanical weakening between adjoining function areas is introduced by both perforation and stamping such that the plastic sheet has one or more sections that are completely separated by the perforation and one or more other sections that have a web with a smaller cross section of material due to the stamping, the mechanical weakening provided during a period of time when the material to be formed is located in the thermoforming die, comprising at least one perforating element with a perforating cutting edge disposed in one of the upper die and the lower die and at least one of: the mechanical weakening is formed in areas of the article, by the at least one perforating element, mutually staggered in the direction of movement and extend vertically thereto; and the mechanical weakening is formed, by the at least one perforating element, at least partly in a plane extending in the direction of movement at an angle α other than 90° with respect to the direction of movement within the thermoformed article.