High yield and enhanced performance fiber
US-10000889-B2 · Jun 19, 2018 · US
Pulping methods, methods for manufacturing paperboard, and paperboard structures
US12516472B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12516472-B2 |
| Application number | US-202117469262-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 8, 2021 |
| Priority date | Sep 9, 2020 |
| Publication date | Jan 6, 2026 |
| Grant date | Jan 6, 2026 |
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- Title
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Abstract
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A pulping method includes chemical cooking of softwood chips to retain a high lignin content of about 18% to about 28% by weight and fiberization of the cooked softwood chips to a low residual wood shive content of at most 15% by weight.
First claim
Opening claim text (preview).
What is claimed is: 1 . A pulping method comprising: chemical cooking of softwood chips, whereby after the chemical cooking, a content of original lignin in the cooked softwood chips is in a range from about 18% to about 28% by weight, wherein the chemical cooking comprises at least one of a kraft chemical cooking process, a sulfite chemical cooking process, and a neutral sulfite semi-chemical (NSSC) chemical cooking process, and wherein the softwood chips are treated with mechanical delamination to enhance liquor penetration during the chemical cooking; and fiberization of the cooked softwood chips to a low residual wood shive content of at most 15% by weight. 2 . The pulping method of claim 1 wherein a resulting pulp of the pulping method comprises at least about 10% by weight softwood fibers. 3 . The pulping method of claim 1 wherein a resulting pulp of the pulping method comprises at least about 20% by weight softwood fibers. 4 . The pulping method of claim 1 wherein a resulting pulp of the pulping method comprises at least about 30% by weight softwood fibers. 5 . The pulping method of claim 1 wherein a resulting pulp of the pulping method comprises at least about 40% by weight softwood fibers. 6 . The pulping method of claim 1 wherein a resulting pulp of the pulping method comprises at least about 50% by weight softwood fibers. 7 . The pulping method of claim 1 wherein a resulting pulp of the pulping method comprises at least about 60% by weight softwood fibers. 8 . The pulping method of claim 1 wherein a resulting pulp of the pulping method comprises at least about 70% by weight softwood fibers. 9 . The pulping method of claim 1 wherein a resulting pulp of the pulping method comprises at least about 80% by weight softwood fibers. 10 . The pulping method of claim 1 wherein a resulting pulp of the pulping method comprises at least about 90% by weight softwood fibers. 11 . The pulping method of claim 1 wherein a resulting pulp of the pulping method comprises at least about 95% by weight softwood fibers. 12 . The pulping method of claim 1 wherein a resulting pulp of the pulping method comprises at least about 98% by weight softwood fibers. 13 . The pulping method of claim 1 wherein a resulting pulp of the pulping method comprises at least about 99% by weight softwood fibers. 14 . The pulping method of claim 1 wherein a resulting pulp of the pulping method comprises about 100% by weight softwood fibers. 15 . The pulping method of claim 1 wherein a resulting pulp of the pulping method has a low residual wood shive content of at most 10% by weight. 16 . The pulping method of claim 1 wherein a resulting pulp of the pulping method has a low residual wood shive content of at most 5% by weight. 17 . The pulping method of claim 1 wherein a resulting pulp of the pulping method has a low residual wood shive content of at most 4% by weight. 18 . The pulping method of claim 1 wherein a resulting pulp of the pulping method has a low residual wood shive content of at most 3% by weight. 19 . The pulping method of claim 1 , further comprising mixing the high lignin content and low residual wood shive content pulp with another pulp to form a blend. 20 . The pulping method of claim 19 , wherein mixed pulp contains at least about 30% by weight of the high lignin content and low residual wood shive content pulp.
Assignees
Inventors
Classifications
Kraft or sulfate pulp · CPC title
Disc mills · CPC title
characterised by configuration · CPC title
Chemical or chemomechanical {or chemothermomechanical} pulp · CPC title
at least one of the sheets having a fibrous composition differing from that of other sheets · CPC title
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- What does patent US12516472B2 cover?
- A pulping method includes chemical cooking of softwood chips to retain a high lignin content of about 18% to about 28% by weight and fiberization of the cooked softwood chips to a low residual wood shive content of at most 15% by weight.
- Who is the assignee on this patent?
- Westrock Mwv Llc
- What technology area does this patent fall under?
- Primary CPC classification D21C3/022. Mapped technology areas include Textiles & Paper.
- When was this patent published?
- Publication date Tue Jan 06 2026 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).