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US 2019/0169799 A1Published application
Low coarseness southern softwood pulps
AssigneeInternational Paper Company
InventorsAmar N. Neogi, Hugh West, Richard W. Heineman, JR.
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AssigneeInternational Paper Company
InventorsAmar N. Neogi, Hugh West, Richard W. Heineman, JR.
Estimating the term…
Pulp sheets produced from Southern pine fibers are disclosed. Embodiments in which the fibers have a fiber length to coarseness ratio equal to or greater than 0.11, with fiber length (LWAFL) in mm and coarseness in mg/100 m, are found to impart stiffness properties to tissue grade handsheets made therefrom comparable to those achieved using of standard NBSK. Embodiments in which the fibers have a low coarseness (of from about 16 to about 20 mg/100 m, at a fiber length (LWAFL) of from about 1.6 to about 3.0 mm) are found to impart wicking properties to absorbent structures made therefrom that are improved relative to those achieved using standard high coarseness SBSK.
1-20. (canceled)
A pulp sheet comprising Southern pine fibers, wherein a TAPPI T-205 tissue-grade handsheet having a target basis weight of 20 grams per square meter (gsm) produced therefrom exhibits a tensile stiffness according to TAPPI T-494, normalized to a tensile index of 1, of 0.040 or below.
A composite pad comprising a matrix of pulp fibers and superabsorbent particles (SAP) distributed throughout the matrix of pulp fibers, wherein SAP constitutes at least 50% of the weight of the composite pad, and wherein Southern pine fibers having a coarseness of from about 16 to about 20 mg/100 m constitute at least 75% of the weight of the pulp fibers.
Dependencies are inferred from the claim text.