Food wrap base sheet with regenerated cellulose microfiber
A base sheet for food wrap products. The base sheet can include a pulp-derived papermaking fiber and a fibrillated regenerated cellulose microfiber having a CSF value of less than about 175 mL.
1. A base sheet for food wrap products, comprising:
a pulp-derived papermaking fiber; and
a fibrillated regenerated cellulose microfiber having a CSF value of less than about 175 mL, wherein the base sheet has a SAT value of less than 2 g/g, a 1-sheet caliper from about 1 mil to about 3 mils, a basis weight from about 5 lbs to about 25 lbs per 3,000 ft 2 , and an MD tensile of greater than about 5 lbs/inch.
2. The base sheet of claim 1 , wherein the fibrillated regenerated cellulose microfiber has a CSF value of less than about 100 mL.
3. The base sheet of claim 1 , wherein the fibrillated regenerated cellulose microfiber has a CSF value of less than about 25 mL.
4. The base sheet of claim 1 , wherein the fibrillated regenerated cellulose microfiber has a number average diameter of from about 0.1 microns to about 2 microns.
5. The base sheet of claim 1 , wherein the fibrillated regenerated cellulose microfiber has a coarseness value of from about 0.001 mg/100 m to about 0.6 mg/100 m.
6. The base sheet of claim 1 , wherein the fibrillated regenerated cellulose microfiber has a weight average diameter of less than about 2 microns, a weight average length of less than about 500 microns, and a fiber count of greater than about 400 million fibers/gram.
7. The base sheet of claim 1 , wherein the fibrillated regenerated cellulose microfiber has a fiber count greater than about 200 billion fibers/gram.
8. The base sheet of claim 1 , wherein at least about 50 wt % of the fibrillated regenerated cellulose microfiber is finer than 14 mesh.
9. The base sheet of claim 1 , wherein at least about 75% by weight of the fibrillated regenerated cellulose microfiber is finer than 14 mesh.
10. The base sheet of claim 1 , wherein the base sheet comprises from about 15 wt % to about 95 wt % of the fibrillated regenerated cellulose microfiber.
11. The base sheet of claim 1 , wherein the base sheet has a pore size of less than about 15 microns.
12. The base sheet of claim 1 , wherein the base sheet has about 50% of its cumulative pore volume in pore sizes of about 15 microns or less.
13. A base sheet for food wrap products, comprising:
a pulp-derived papermaking fiber;
a fibrillated regenerated cellulose microfiber having a CSF value of less than about 175 mL, a weight average length of less than about 400 microns, and a weight average diameter of less than about 2 microns; and
a water or grease resistant agent, or both applied to the base sheet in water borne form, melt form, or as a latex,
wherein the base sheet has a SAT value of less than 2 g/g, a MD tensile strength of greater than about 10 lbs/inch, and a pore size of less than about 15 microns.
14. The base sheet of claim 13 , wherein the fibrillated regenerated cellulose microfiber has a CSF value of less than about 25 mL.
15. The base sheet of claim 13 , wherein the base sheet has a 1-sheet caliper of about 1 mil to about 3 mils and a basis weight of about 5 lbs to about 25 lbs per 3,000 ft 2 .