Patent ID: 8844136
Filing Date: 2014-09-30
Classification: B01J,B29C,B29K,B29L,F28F,Y10T

Abstract:
1. A method for generating a positive lock between two plastic sheets, comprising the following steps: bringing the two plastic sheets into contact at a contact point, wherein the plastic sheets are essentially parallel to each other; positioning a negative mould with an opening near the contact point of the two plastic sheets; and moving a pin from the other side of the plastic sheets contacting each other in the direction of the negative mould and pushing the pin into the negative mould to a pressed state, such that the two plastic sheets lying between negative mould and pin are cold-formed to create a cupular connection, wherein in the pressed state the pin and a side wall of the negative mould define therebetween a distance in the range of one half the thickness of one of the two plastic sheets to four times the thickness of said one of the two plastic sheets, such that said moving step of said pin as a single step causes a positive lock at the cupular connection between the two plastic sheets to be simultaneously generated with the cold-forming of the two plastic sheets without the need for further tools for the deformation of the plastic sheets.