Headbox apparatus for a papermaking machine
US8075737B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 18, 2007 |
| Grant date | Dec 13, 2011 |
| Priority date | — |
| Expiry date | Dec 18, 2029 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21F1/06
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A headbox apparatus for a papermaking machine is disclosed. The headbox apparatus defines a flow path for stock flowing between an upstream location and a downstream slice lip. The apparatus includes a plurality of blocks which are anchored within the flow path between the upstream location and the slice lip. Each block and an adjacent block of the plurality of blocks define therebetween a flow tube for the flow therethrough of the stock. The flow tube has an upstream portion having an upstream and a downstream end. The flow tube has a downstream portion having an upstream and a downstream extremity, the upstream extremity of the downstream portion extending from the downstream end of the upstream portion. The downstream portion of the flow tube has a volume which is greater than a further volume of the upstream portion of the flow tube such that when the stock flows from the upstream portion to the downstream portion of the flow tube, the stock is mixed within the downstream portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.