Rotary die head of film blowing machine for starch biodegradable material
US8157557B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Aug 4, 2010 |
| Grant date | Apr 17, 2012 |
| Priority date | — |
| Expiry date | Aug 7, 2030 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2023/001
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A rotary die head for a film blowing machine for use with a starch-based biodegradable material including a core mould and an outer body. The core mould includes a spiral core mould sleeved on a center pivot and a rotary core mould fixed on the center pivot, jointed with each other. A motor drives the center pivot and the rotary core mould to rotate. The outer body includes an inner die casing sleeved on the spiral core mould, an outer die casing fit with the inner die casing, and a mouth die casing. The inner die casing, the mouth die casing, the spiral core mould, and the rotary core mould form a material flow and molding channel consisting of a herringbone feed-in slot, spiral conveying slots, an annular gap buffer zone, a tapering cone passage, an annular loosing cavity, and a final molding gap in turn from bottom to top.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.