Apparatus and method of packaging large items
US4069643A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1977 |
| Grant date | Jan 24, 1978 |
| Priority date | — |
| Expiry date | Apr 27, 1997 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65B31/02
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
This invention discloses a packaging apparatus and method for large size products such as subprimals of meat. The products to be packaged are characterized as often having irregular surfaces and voids which make sealing of the film without wrinkles very difficult, particularly after bringing to a condition of reduced pressure. There is shown apparatus for forming a drape of film from two rolls of film and into this drape of film is advanced the product to be packaged. This drape is formed into a tubular film around the product and with this tube open at both ends. Into these open ends of the tube are moved spreader probes or bars which operate as pairs and are moved away from one another by a pneumatic cylinder which is actuated by appropriate apparatus so that the spreader probes as they move apart cause the film in these ends to be brought to a narrow opening and under a slight stretch. This elongated opening is substantially equally spaced from a theoretical center line of the tubular film. With the probes moved to a condition for stretching the film, the encased product and film are brought in way of a film heater and then are moved to a vacuum chamber whereat the spreader prob…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.