Mandrel for forming a bottom in a packaging container
US4861328A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1988 |
| Grant date | Aug 29, 1989 |
| Priority date | — |
| Expiry date | Dec 21, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB31B50/00
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A mandrel used in a packaging machine being in a tubular shape and provided with a cooling chamber at one end so as to cool a plain plate which is positioned at the top of the mandrel and contacts the heated, infolded and compressed bottom of a tubular package carton blank. Four projections are formed on the outer surface of the mandrel so as to contact each corner of the tubular package carton blank to leave it open. A pair of water cooling pipes are provided in the tubular mandrel with a space left between the internal wall of the tubular mandrel and connected to the cooling chamber so that only the bottom of the heat-sealed container made of a tubular package carton blank with thermoplastic coatings thereon is cooled and the side walls of the container are free from moisture condensation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.