Method for recovering pulp fiber from used sanitary product and recycled pulp obtained thereby
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United States of America Patent
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Mar 30, 2021
Grant Date -
Sep 26, 2019
app pub date -
Jun 4, 2019
filing date -
Sep 22, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
Pulp fiber containing little ash is effectively recovered from a used sanitary product containing the pulp fiber and a polymer absorbent. The method according to the present invention comprises: a step for treating the used sanitary product with an ozone-containing gas and thus decomposing and removing at least a portion of the polymer absorbent in the used sanitary product; and a step for stirring the used sanitary product, that has been treated with the ozone-containing gas, in water or an aqueous solution containing an antiseptic and thus decomposing the used sanitary product into constituents. If required, the method may further comprise a step for separating the pulp fiber from the decomposition product obtained by the decomposition step.
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International Classification(s)
- C08J:WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTE....
- D21B:FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMEN....
- B29B:PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE ....
- B09B:DISPOSAL OF SOLID WASTE
- B29L:INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RE....
- A61L:METHODS OR APPARATUS FOR STERILISING MATERIALS OR ....
- D21C:PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE ....
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