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US 8,540,848 B2Granted
Method and device for a de-acidifying paper
AssigneeOmniAccess B.V.
InventorsStephanus Gerardus Johannes Blankenborg, Maaike Jacobine Esther Van Roosmalen
Life of this patent
Estimating the term…
Abstract
For decades books and other paper documents have been deteriorating in archives and libraries around the world because the acidity of the paper is increasing so much (wherein the pH decreases) that the paper cellulose is decomposing so that the paper loses its cohesion and thereby degenerates in terms of quality. The invention relates to an improved method for de-acidifying paper. The invention also relates to a device for applying such a method.
Claims12
Method for de-acidifying paper, comprising the steps of:
- A) bringing the paper to be treated into contact with liquid carbon dioxide or supercritical carbon dioxide, wherein the fluid liquid carbon dioxide or supercritical carbon dioxide is provided with at least one alkaline alkoxy compound comprising an aminoalkylalkoxysilane compound or a derivative thereof, whereby the paper is impregnated with the aminoalkylalkoxysilane compound or a derivative thereof, and
- B) ending the treatment according to step A) by reducing the pressure, whereby the liquid carbon dioxide or supercritical carbon dioxide is passed into the gas phase and is removed from the paper.
Dependencies are inferred from the claim text.