Bonded, differentially creped, fibrous webs and method and apparatus for making same
OwnerHenry E. Becker, Albert L. McConnell +1inventors
InventorsHenry E. Becker, Albert L. McConnell, Richard W. Schutte
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Abstract
A method is disclosed for forming a strong, soft, fibrous sheet material having substantial stretch in all directions in its own plane, by applying a pattern of bonding material to a fibrous web, adhering only portions of the web containing bonding material to a creping surface, removing the web from the creping surface by a creping blade to differentially crepe it, whereby a combination of high strength, softness, and bulk are imparted to the web. Sheet materials formed by the above method are also disclosed.
Claims41
A strong, soft, fibrous sheet material having substantial stretch in all directions in its own plane, said sheet material comprising a web of predominantly cellulosic fibers having a length of less than about 1/4 inch and having bonding material disposed in a fine pattern in said sheet material for producing a pattern of bonded portions and portions unbonded by said bonding material in said sheet material, said sheet material having a basis weight of from about 6 to about 60 lbs. per ream of 2880 square feet, said bonded web portions being finely creped to impart softness and stretch thereto, said bonding material having been applied in such amount as to result in a sheet having at least about 1.4% non-volatile constituents of bonding material based on the weight of the dry web.
A strong, soft, fibrous sheet material having substantial stretch in all directions in its own plane, said sheet material comprising a web of predominantly papermaking fibers and having bonding material disposed in a fine pattern in said sheet material for producing a pattern of bonded portions and portions unbonded by said bonding material in said sheet material, said sheet material having a basis weight of from about 6 to about 60 lbs. per ream of 2880 square feet, the amount of bonding material disposed in said sheet material being at least about 1.4% non-volatile constituents based on the weight of the dry web, said bonded web portions being finely creped to impart softness and stretch thereto, and wherein portions of said web adjoining said bonded web portions are split internally in the general plane of said web, whereby said web has increased bulk, softness and flexibility.
A strong, soft fibrous sheet material having substantial stretch in all directions in its own plane, said sheet material comprising:
- a web of predominantly cellulosic fibers having a length of less than about 1/4 inch, said sheet material having a basis weight of from about 6 to about 60 pounds per ream of 2880 square feet,
- said web being characterized by a fine pattern of raised areas and depressions distributed over each of its surfaces, the raised areas on one side of said web forming the depressions on the other side of said web and the depressions on one side of said web forming the raised areas on the other side of said web, and
- a bonding material disposed in the raised areas on one side of said web so as to bond at least some of the fibers together therein to form bonded web portions of greater strength than adjacent unbonded web portions which do not contain said bonding material, said bonding material being in an amount of at least about 1.4% non-volatile constituents of bonding material based upon the weight of the dry web,
- the raised surface of each of said bonded web portions being finely creped to impart softness thereto.
A strong, soft, fibrous sheet material having substantial stretch in all directions in its own plane and being suitable for sanitary wiping purposes, such sheet material comprising a web defined by a matrix of cellulosic fibers, said web being itself characterized by such reduced interfiber bonding strength as to have inadequate structural integrity for sanitary wiping purposes, said web being primarily cellulosic fibers having a length of less than about 1/4 inch, said sheet material having a basis weight of from about 6 to about 60 lbs. per ream of 2880 square feet, and said sheet material further comprising a fine patterned applique of bonding material on one surface thereof, in interfiber bonding amount comprising at least about 1.4% non-volatile constituents based on the weight of the dry web, such that a substantial portion of said surface of said web is free from said bonding material, said applique penetrating said web at least part way through the thickness thereof, said applique defining bonded regions in the sheet material whereat the fibers are bonded together by said bonding material to contribute to the strength of said sheet material and impart structural integrity thereto, whereas in the unbonded regions of the sheet material very little interfiber bonding strength exists, said sheet material being further characterized in that said bonded regions are differentially creped to impart softness and stretch to the sheet material, and by a fine pattern of raised areas and depressions distributed over at least one of the face surfaces thereof.
A strong, soft, fibrous sheet material having substantial stretch in all directions in its own plane and being suitable for sanitary wiping purposes, said sheet material comprising a web defined by a matrix of cellulosic fibers, said web being itself characterized by such reduced interfiber bonding strength as to have inadequate structural integrity for sanitary wiping purposes, said web comprising cellulosic fibers having a length of less than about 1/4 inch and having a basis weight of from about 6 to about 60 lbs. per ream of 2880 square feet, and said sheet material further comprising a fine patterned applique of bonding material on one surface thereof, in interfiber bonding amount comprising at least about 1.4% non-volatile constituents based on the weight of the dry web, such that a substantial portion of said surface of said web is free from said bonding material, said applique penetrating said web at least part way through the thickness thereof, said applique defining bonded regions in said sheet material whereat the fibers are bonded together by said bonding material to contribute to the strength of said sheet material and impart structural integrity thereto, whereas in the unbonded regions of said sheet material very little interfiber bonding strength exists, said sheet material being further characterized by a fine pattern of raised areas and depressions distributed over at least one of the face surfaces thereof with said bonding material being disposed in the raised areas on at least one face surface and the raised areas being finely creped.
A soft, absorbent, creped fibrous web formed by deposition from an aqueous slurry, said web comprising
- randomly arranged, contacting papermaking fibers, and
- an elastomeric bonding material at some of the contact points between said fibers to impart structural integrity to said web, said bonding material comprising at least about 1.4% non-volatile constituents based on the weight of the dry web, and
- wherein said web has a basis weight of from about 10 to about 30 lbs. per ream of 2880 square feet, a TEA-to-stiffness ratio greater than 1.5.times.10.sup.-4, an average calculated density throughout its thickness under no load of less than 0.300 grams per cubic centimeter, and said web being finely creped at the portions having bonding material.
Dependencies are inferred from the claim text.