IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0562302
(2000-05-01)
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발명자
/ 주소 |
- Schmidt, Bradley G.
- Vande Hey, James R.
- Zadrazil, James M.
- Yock, Edward J.
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출원인 / 주소 |
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인용정보 |
피인용 횟수 :
15 인용 특허 :
34 |
초록
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A method of making an embossed air-laid absorbent sheet includes: depositing a dry web of fibers on a foraminous support; embossing the compacted web with a laser engraved roll provided with a hard rubber embossing surface having an embossing pattern with a depth of from about 5 mils to about 100 mi
A method of making an embossed air-laid absorbent sheet includes: depositing a dry web of fibers on a foraminous support; embossing the compacted web with a laser engraved roll provided with a hard rubber embossing surface having an embossing pattern with a depth of from about 5 mils to about 100 mils. The hard rubber embossing surface is biased toward a second embossing surface selected from the group consisting of the surface of a nip roll and a foraminous web support engaging a support embossing roll. The process further includes bonding the web.
대표청구항
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1. A method of making an embossed air-laid absorbent sheet product comprising:(a) depositing a dry web of fibers on a foraminous support; (b) compacting said fiber web; (c) embossing said compacted web with a laser-engraved roll with a hard rubber embossing surface provided with an embossing pattern
1. A method of making an embossed air-laid absorbent sheet product comprising:(a) depositing a dry web of fibers on a foraminous support; (b) compacting said fiber web; (c) embossing said compacted web with a laser-engraved roll with a hard rubber embossing surface provided with an embossing pattern including a plurality of upwardly projecting bosses, the pattern having a depth of from about 5 mils to about 125 mils, said hard rubber embossing surface being heated to or maintained at a temperature of from about 100° F. to about 300° F. and biased toward a second embossing roll with a smooth surface; and (d) bonding said fiber web. 2. The method according to claim 1, wherein said hard rubber surface has a durometer hardness of from about 50 to about 100.3. The method according to claim 2, wherein said hard rubber surface has a durometer hardness of from about 75 to about 100.4. The method according to claim 3, wherein said hard rubber surface has a durometer hardness of from about 85 to about 100.5. The method according to claim 1, wherein said laser-engraved roll is heated to or maintained at a temperature of from about 200° F. to about 260° F.6. The method according to claim 1, wherein said hard rubber surface of said laser-engraved roll is provided with an embossing pattern with a depth of from about 10 to about 75 mils.7. The method according to claim 6, wherein said hard rubber embossing surface of said laser engraved-roll is provided with an embossing pattern with a depth of from about 15 mils to about 50 mils.8. The method according to claim 1, wherein said laser-engraved roll comprises a steel roll provided with a rubber sleeve of from about {fraction (1/32)} inch to about 1 inch in thickness.9. The method according to claim 8, wherein said laser-engraved roll comprises a steel roll provided with a rubber sleeve of from about ¼ inch to about ¾ inch in thickness.10. The method according to claim 9, wherein said rubber sleeve is about ½ inch in thickness.11. The method according to claim 10, wherein the step of bonding said fiber web includes applying a binder to said fiber web and curing said binder.12. The method according to claim 1, wherein said embossed air-laid absorbent sheet product has a basis weight of from about 25 to about 400 lbs. per 3,000 square foot ream.13. The method according to claim 12, wherein said embossed air-laid absorbent sheet product has a basis weight of from about 35 to about 150 lbs. per 3,000 square foot ream.14. The method according claim 1, wherein said dry web of fibers consists essentially of cellulosic fibers.15. The method according to claim 1, wherein said dry web of fibers comprises synthetic fibers and cellulosic fibers.16. The method according to claim 15, wherein said dry web of fibers comprises from about 5% to about 50% by weight of synthetic fiber based on the combined weight of synthetic and cellulosic fiber.17. The method according to claim 15, wherein said dry web of fibers comprises from about 7.5% to about 15% by weight of synthetic fiber based on the combined weight of synthetic fiber and cellulosic fiber.18. The method according to claim 15, wherein said synthetic fibers are selected from the group consisting of: rayon fibers, poly(ethylene) fibers, poly(propylene) fibers, poly(ethylene terephthalate) fibers, nylon fibers and mixtures thereof.19. The method according to claim 18, wherein said synthetic fibers are poly(ethylene) or poly(propylene) fibers.20. The method according to claim 15, wherein said synthetic fibers comprise fiber selected from the group consisting of low melting point fibers and bicomponent fibers with a low melting polymeric component.21. The method according to claim 20, wherein said low melting point fibers and said low melting polymer component of said bicomponent fibers comprise poly(ethylene).22. The method according to claim 1, wherein said embossed air-laid absorbent sheet product includes a superabsorbent polymer component.23. The method according to claim 22, wherein said superabsorbent polymer component is selected from the group consisting of superabsorbent powder, superabsorbent granules, superabsorbent binder, and superabsorbent fibers.24. A method of making an embossed air-laid absorbent sheet product comprising:(a) depositing a dry web of fibers on a foraminous support; (b) compacting said fiber web; (c) embossing said compacted web with a laser-engraved roll with a hard rubber embossing surface heated to or maintained at a temperature of from about 100° F. to about 300° F., the surface being provided with an embossing pattern having a depth of from about 5 mils to about 125 mils, said hard rubber embossing surface being biased toward a second embossing surface selected from the group consisting of the surface of a nip roll and a foraminous web support engaging a support embossing roll; and (d) bonding said fiber web. 25. The method according to claim 24, wherein the step of bonding said fiber web includes applying a polymer emulsion binder to said fiber web and curing said binder.26. The method according to claim 25, wherein said step of applying binder to said web is subsequent to said stop of embossing said compacted web.27. The method according to claim 24, wherein said surface of said nip roll is selected from the group consisting of an unpatterned rubber surface, said unpatterned rubber surface having a hardness which is less than the hardness of said hard rubber surface of said laser-engraved roll, a patterned rubber surface having a hardness which is less than the hardness of said hard rubber surface of said laser-engraved roll, and an unpatterned steel roll and a patterned steel roll.28. The method according to claim 24, wherein said hard rubber surface has a durometer hardness of from about 50 to about 100.29. The method according to claim 28, wherein said hard rubber surface has a durometer hardness of from about 75 to about 100.30. The method according to claim 29, wherein said hard rubber surface has a durometer hardness of from about 85 to about 100.31. The method according to claim 24, wherein said laser-engraved roll is heated to or maintained at a temperature of from about 200° F. to about 260° F.32. The method according to claim 24, wherein said hard rubber surface of said laser-engraved roll is provided with an embossing pattern with a depth of from about 10 to about 75 mils.
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