Method for making a fibrous article
View Patent ↗The present invention generally relates to a method and apparatus for a making a formed fibrous article and more specifically to method and apparatus for making a formed fibrous article useful as an absorbent core structure in a disposable sanitary article such as a sanitary napkin, panty liner, diaper or the like. The present invention also relates to a disposable sanitary article including a formed fibrous article according to the present invention as a core structure thereof.
1. A method of making a formed fibrous article comprising the steps of:
pin-calendering a fibrous article in a pin calendering station between a first roll and a second roll, wherein the fibrous article is conveyed through a nip defined between the first roll and the second roll without the use of a carrier layer; and
wherein the first roll comprises a vacuum roll and the second roll comprises a pin calender roll.
2. The method according to claim 1 , wherein a surface of the vacuum roll includes a plurality of holes and the pin calender roll includes a plurality of pins extending outwardly from a surface of the roll.
3. The method according to claim 2 , wherein each one of the plurality of pins is arranged such that it does not overlap with any of the plurality of holes.
4. The method according to claim 1 , further comprising:
prior to pin calendering, providing fibrous pulp, maintaining the fibrous pulp in a chamber, mounting a mold to a rotating forming drum, rotating the mold on the rotating forming drum until the mold is arranged in communication with the chamber, and drawing the fibrous pulp into the mold to thereby form the fibrous article.
5. The method according to claim 4 , further comprising:
transferring the fibrous article from the mold to a calendering station.
6. The method according to claim 5 , wherein the fibrous article is formed in the mold and transferred to the calendering station without the use of a carrier layer.
7. The method according to claim 6 , wherein the calendering station includes a vacuum roll and an opposed calender roll.
8. The method according to claim 7 , further comprising:
calendering the fibrous article between the vacuum roll and the opposed calender roll.
9. The method according to claim 8 , further comprising:
transferring the fibrous article from the vacuum roll of the calendering station to the vacuum roll of the pin calendering station.
10. The method according to claim 9 , wherein the fibrous article is transferred from the vacuum roll of the calendering station to the vacuum roll of the pin calendering station without the use of a carrier layer.
11. The method according to claim 10 , further comprising transferring the fibrous article from the vacuum roll of the pin calendering station to a transfer wheel.
12. The method according to claim 11 , wherein the transfer wheel includes a vacuum roll and a porous conveyor belt that extends around the vacuum roll.
13. The method according to claim 12 , wherein each one of the plurality of pins is arranged in one of a plurality of arrays arranged over the surface of the pin calendering roll.
14. The method according to claim 13 , wherein each array is arranged in spaced relationship to an adjacent array.
15. The method according to claim 14 , wherein each array is adapted to emboss an individual fibrous article.