Building construction felt paper with biocide/anti-microbial treatment
View Patent ↗A nonwoven web has a weight sufficient for construction industry use and comprises at least forty percent (40%) recycled waste paper. At least one surface of the web bears a biocide, e.g., has a biocide applied thereto. Preferably the weight of the web is greater than fifteen pounds per thousand square feet (15-lbs/MSF). Preferably the biocide is zinc pyrithione. The web preferably bears at least 50-grams of biocide per thousand square feet per side of said web. One example use of the web is as builders felt, with other uses including as a facer for a laminate board and for asphalt-impregnated webs. The biocide-bearing nonwoven web is specifically directed to use in building construction. One example use of the web is as builders felt, with other uses including as a facer for a laminate board and for asphalt-impregnated webs. Because building construction products must be tough, but priced as low as possible, this web is made largely from recycled waste paper (as opposed to virgin cellulose fiber, as a cost-reducing measure), and optionally clarifier sludge.
1. A process of making a nonwoven web comprising:
introducing a furnish comprising at least forty percent (40%) recycled waste paper into a paper forming machine to produce a web substrate having a weight sufficient for construction industry use, the web substrate being susceptible of being wound by a reel forming device; and then
applying a biocide to at least one surface of the web substrate.
2. The process of claim 1 , further comprising applying the biocide at a size press.
3. An article produced by the process of claim 2 .
4. The process of claim 1 , further comprising applying the biocide at a shower of a steam-heated dryer.
5. An article produced by the process of claim 4 .
6. The process of claim 1 , further comprising applying the biocide at a waterbox of a calender roll.
7. An article produced by the process of claim 6 .
8. The process of claim 1 , further comprising applying the biocide after a wet-press section.
9. An article produced by the process of claim 8 .
10. The process of claim 1 , further comprising applying the biocide at a coater.
11. An article produced by the process of claim 10 .
12. An article produced by the process of claim 1 .
13. The process of claim 1 , wherein the biocide comprises zinc pyrithione; ortho-Phenyl Phenol; or, a silicone quaternary amine with an active ingredient 3-trimethixysilylpropyldimethyloctadecyl ammonium chloride.
14. The process of claim 1 , wherein the web comprises builders felt.