Apparatus and method for molding an opening device on a packaging sheet
US6303066A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 1999 |
| Grant date | Oct 16, 2001 |
| Priority date | — |
| Expiry date | Mar 29, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/7162
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An apparatus and method for molding opening devices onto a packaging material sheet at respective holes provided in the sheet. The apparatus includes first and second mold tools arrangeable in a closed position so as to be in contact with opposite sides of the sheet and in an open position so as to be positioned distally from the sheet. In the closed positions a mold cavity is formed between the first and second mold tools for accommodating a hole edge in the sheet. The apparatus further includes an injection passage for injecting heated thermoplastics material into the mold cavity, which injection passage extends in one of the mold tools such that the thermoplastics material is injected directly into the mold cavity at an injection point of the mold cavity which is located distally from the hole edge, for providing effective formation of the opening device on the sheet. One of the mold tools includes a pair of half mold tools which are simultaneously moved from the open position to the closed position and vice versa such that the direction of movement of each of said half mold tools between the open and closed positions tangentially follows a circular path, for reducing wear of th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.