Active substance and device for the deacidification of printed matter
US6645298B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 5, 2001 |
| Grant date | Nov 11, 2003 |
| Priority date | — |
| Expiry date | Jan 5, 2021 |
Classification
- Technology area (CPC D)Textiles; Paper
- CPC primaryD21H17/66
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
Modern techniques for manufacturing paper using mechanical wood pulp has lead to a persistent over-acidification of printed manner, and threatens to permanently destroy the same. This over-acidification can be neutralized by using an alkaline active substance whose main component is a salt having a relatively low water affinity. An alkaline deposit can be deposited on the paper by also using said alkaline active substance. A device suited for deacidification using this active substance comprises a case (10) which can be closed. Printed matter which can be fanned out in a stand (1) is treated in said case. The printed matter is treated by introducing the powdered active substance via a screw conveyor (32) into an air stream circulated by a fan (19a), whereby the printed matter is leafed through in order to expose it to the active substance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.