Process for manufacturing recycled pulp from used sanitary goods
US-2016237617-A1 · Aug 18, 2016 · US
Method for recovering pulp fiber from used sanitary product and recycled pulp obtained thereby
US10960577B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10960577-B2 |
| Application number | US-201916262849-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 30, 2019 |
| Priority date | Aug 7, 2015 |
| Publication date | Mar 30, 2021 |
| Grant date | Mar 30, 2021 |
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- Title
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Abstract
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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.
First claim
Opening claim text (preview).
The invention claimed is: 1. Recycled pulp having an ash content of not more than 0.8 percent by weight and a water absorption factor of not less than 12 times. 2. Recycled pulp according to claim 1 , having an ash content of not more than 0.65 percent by weight. 3. Recycled pulp according to claim 2 , having a moisture content of 5 to 13%. 4. Recycled pulp according to claim 1 , having a moisture content of 5 to 13%. 5. Recycled pulp according to claim 1 , wherein the recycled pulp is obtained by a method for recovering pulp fiber from a used sanitary product including pulp fiber and a polymer absorbent, the method comprising the steps of: treating the used sanitary product with an ozone-containing gas to decompose and remove at least a portion of the polymer absorbent in the used sanitary product, and stirring the used sanitary product that has been treated with the ozone-containing gas, in a disinfectant-containing aqueous solution or in water to decompose the used sanitary product into its constituent elements.
Assignees
Inventors
Classifications
Working-up waste paper (mechanical part D21B1/08, D21B1/32) · CPC title
- B29B17/02Primary
Separating plastics from other materials · CPC title
Diapers, napkins · CPC title
Plastics recycling; Rubber recycling · CPC title
Washing the materials in liquids · CPC title
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- What does patent US10960577B2 cover?
- 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 stir…
- Who is the assignee on this patent?
- Unicharm Corp
- What technology area does this patent fall under?
- Primary CPC classification B29B17/02. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Tue Mar 30 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).