Method and apparatus for producing tissue paper
View Patent ↗A method of making paper comprising over drying the paper web by a dryer; transporting the paper web to a reel; and supplying dry air adjacent at least a portion of the paper web's travel path from the dryer to the reel. A paper machine comprising a dryer and a reel; at least one blow box located between the dryer and the reel; and a blower supplying a source of dry air to the at least one blow box.
1. A method of making a paper web comprising:
over drying the paper web by a dryer;
transporting the paper web to a reel; and
supplying dry air above and below the paper web's travel path from the dryer to the reel, said dry air sufficient to prevent the paper web from reaching its moisture equilibrium point until after the paper web has been wound into a parent roll.
2. The method of claim 1 wherein the over drying comprises through-air drying.
3. The method of claim 2 comprising:
transferring the paper web from a through-air dryer fabric to at least one carrier fabric located between a through-air dryer and the reel by a vacuum transfer roll; and
conveying the paper web on the at least one carrier fabric for at least a portion of the travel path from the through-air dryer to the reel.
4. The method of claim 3 comprising supplying dry air towards a vacuum zone of the vacuum transfer roll.
5. The method of claim 4 comprising supplying dry air adjacent to the paper web or the at least one carrier fabric between the vacuum transfer roll and the reel.
6. The method of claim 3 comprising supplying dry air adjacent to the paper web or the at least one carrier fabric between the vacuum transfer roll and the reel.
7. The method of claim 1 comprising over drying the paper web to a moisture content of about 5 percent or less at the exit of the dryer.
8. The method of claim 1 comprising over drying the paper web to a moisture content of about 3 percent or less at the exit of the dryer.
9. The method of claim 1 comprising over drying the paper web to a moisture content of about 2 percent or less at the exit of the dryer.
10. The method of claim 1 wherein the dry air has a relative humidity of about 20 percent or less.
11. The method of claim 1 comprising winding the paper web into a parent roll and then wrapping the parent roll in a moisture impermeable substrate after being wound.
12. The method of claim 11 comprising removing the moisture impermeable substrate and converting the parent roll into a finished product in a room having a relative humidity less than about 35 percent.
13. The method of claim 12 wherein the converting comprises calendaring the paper web.
14. The method of claim 11 comprising removing the moisture impermeable substrate, unwinding the parent roll, and supplying dry air adjacent at least a portion of the paper web's travel path during converting into a finished product.
15. A method of making a paper web comprising:
(a) over drying the paper web by a dryer;
(b) transporting the paper web to a reel;
(c) supplying dry air adjacent at least a portion of the paper web's travel path from the dryer to the reel;
(d) winding the paper web into a parent roll; and
(e) wrapping the parent roll in a moisture impermeable substrate after being wound.
16. The method of claim 15 comprising removing the moisture impermeable substrate and converting the parent roll into a finished product in a room having a relative humidity less than about 35 percent.
17. The method of claim 16 wherein the converting comprises calendaring the paper web.
18. The method of claim 15 comprising removing the moisture impermeable substrate, unwinding the parent roll, and supplying dry air adjacent at least a portion of the paper web's travel path during converting into a finished product.