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US 4,158,594 AGranted
Bonded, differentially creped, fibrous webs and method and apparatus for making same
AssigneeScott Paper Company
InventorsHenry E. Becker, Albert L. McConnell, Richard W. Schutte
Life of this patent
Estimating the term…
Abstract
A method is disclosed for forming a strong, soft, fibrous sheet material having substantial stretch in all directions in its own plane, by formimg a web of cellulosic fibers having a basis weight of from about 5 to about 55 pounds per ream of 2,880 square feet, adhering one surface of the web to a creping surface in a fine pattern arrangement by a bonding material adhered to one surface of the web and to the creping surface in the fine pattern arrangement, and creping the web from the creping surface to form the sheet material. Sheet materials formed by the above method are also disclosed.
Claims51
A method of forming a strong, soft, fibrous sheet material having substantial stretch in all directions in its own plane, comprising:
- forming a web predominantly of cellulosic fibers having a length of less than 1/4 inch to have a basis weight of from about 5 to about 55 lbs. per ream of 2880 square feet,
- applying a bonding material to one surface of said web in a quantity to result in said sheet material having at least about 1.4% non-volatile constituents of bonding material based on the dry web weight of said sheet material, and in a fine pattern which leaves a substantial portion of said surface of said web free from said bonding material, to form bonded portions in said sheet material in which fibers are bonded together by said bonding material to contribute to the strength of said sheet material,
- adhering with said bonding material said bonded portions to a creping surface, and
- differentially creping said web from said creping surface to form said sheet material.
1 more element
A method of forming a strong, soft, fibrous sheet material having substantial stretch in all directions in its own plane, comprising:
- forming a web predominated of cellulosic fibers having a length of less than 1/4 inch to have a basis weight of from about 5 to about 55 pounds per ream of 2880 square feet,
- applying a bonding material which includes a curable component to one surface of said web in a fine pattern which leaves a substantial portion of said surface of said web free from said bonding material, to form bonded web portions in said sheet material in which fibers are bonded together by said bonding material,
- adhering with said bonding material said bonded web portions to a creping surface,
- creping said web from said creping surface to form said sheet material, and
- curing said curable component in said bonding material after creping said web.
2 more elements
A method of forming a strong, soft, fibrous sheet material having substantial stretch in all directions in its own plane, comprising:
- forming a web predominantly of cellulosic fibers having a length of less than 1/4 inch to have a basis weight from about 5 to 55 lbs. per ream of 2880 square feet,
- applying a bonding material to one surface of said web in a quantity to result in said sheet material having at least about 1.4% non-volatile constituents of bonding material based on the dry web weight of said sheet material, and in a fine pattern which leaves a substantial portion of said surface of said web free from said bonding material, to form bonded portions in said sheet material in which fibers are bonded together by said bonding material to contribute to the strength of said sheet material,
- bringing said one surface of said web into engagement with a creping surface to adhere said bonded portions to said creping surface by said bonding material, and
- differentially creping said web from said creping surface to form said sheet material.
1 more element
A method of forming a strong, soft, fibrous sheet material having substantial stretch in all directions in its own plane, comprising:
- forming a web predominantly of cellulosic fibers having a length of less than 1/4 inch to have a basis weight of from about 5 to about 55 lbs. per ream of 2880 square feet,
- applying a bonding material to one surface of said web in a quantity to result in said sheet material having at least about 1.4% non-volatile constituents of bonding material based on the dry web weight of said sheet material in a fine pattern which leaves a substantial portion of said surface of said web free from said bonding material, to form bonded portions in said sheet material in which fibers are bonded together by said bonding material to contribute to the strength of said sheet material, said bonding material penetrating said web generally only part way through the thickness of said web,
- adhering with said bonding material said bonded portions to a creping surface, and
- differentially creping said web creping surface to form said sheet material.
1 more element
A method of forming a strong, soft, fibrous sheet material having substantial stretch in all directions interfiber its own plane, comprising:
- (i) providing a web which comprises a matrix of cellulosic fibers, said web being characterized by such reduced inter-fiber bonding strength as to have inadequate structural integrity for sanitary wiping purposes, and said web being primarily cellulosic fibers having a length of less than 1/4 inch and having a basis weight of from about 5 to about 55 lbs. per ream of 2880 square feet,
- (ii) applying an interfiber bonding amount of bonding material to one surface of said web in a quantity to result in said sheet material having at least about 1.4% non-volatile constituents of bonding material based on the dry web weight of said sheet material, and in a fine pattern which leaves a substantial portion of said surface of said web free from said bonding material, to form bonded portions in said sheet material in which fibers are bonded together by said bonding material to contribute to the strength of said sheet material and impart structural integrity thereto, said bonding material penetrating said web at least part way through the thickness of said web,
- (iii) adhering with said bonding material said bonded portions of said web to a creping surface, and
- (iv) differentially creping said web from said creping surface to form said sheet material having structural integrity imparted by said bonding material, which interfiber bonding amount of bonding material effects formation of essentially no hard or brittle interfiber bonds of natural interfiber bonding type.
1 more element
A method of forming a strong, soft, fibrous sheet material having substantial stretch in all directions in its own plane, comprising:
- (i) providing a web which comprises a matrix of lignocellulosic fibers, said web being characterized by very little interfiber bonding strength as to have inadequate structural integrity for sanitary wiping purposes, and said web being primarily lignocellulosic fibers having a length of less than 1/4 inch and having a basis weight of from about 5 to about 55 lbs. per ream of 2880 square feet,
- (ii) applying an interfiber bonding amount of bonding material to one surface of said web in a quantity to result in said sheet material having at least about 1.4% non-volatile constituents of bonding material based on the dry web weight of said sheet material, and in a fine pattern which leaves a substantial portion of said surface of said web free from said bonding material, to form bonded portions in said sheet material in which fibers are bonded together by said bonding material to contribute to the strength of said sheet material and impart structural integrity thereto, said bonding material penetrating said web at least part way through the thickness of said web and said interfiber bonding amount thereof being in excess of that amount required for the below step (iii) of adhering to a creping surface,
- (iii) adhering with said bonding material said bonded portions of said web to a creping surface, and
- (iv) differentially creping said web from said creping surface to form said sheet material having structural integrity imparted by said bonding material, which interfiber bonding amount of bonding material effects formation of essentially no hard or brittle interfiber bonds of natural interfiber bonding type, and whereby the very little interfiber bonding strength of the web is maintained, except for that created by the bonding material in the bonded areas.
1 more element
A method of forming a strong, soft, fibrous sheet material having substantial stretch in all directions in its own plane, comprising:
- providing a web predominantly of cellulosic fibers having a length of less than 1/4 inch and a basis weight of from about 5 to about 55 lbs. per ream of 2880 square feet,
- applying a bonding material to one surface of said web in a quantity to result in said sheet material having at least about 1.4% non-volatile constituents of bonding material based on the dry web weight of said sheet material, and in a fine pattern which leaves a substantial portion of said surface of said web free from said bonding material, to form bonded portions in said sheet material in which fibers are bonded together by said bonding material to contribute to the strength of said sheet material,
- adhering with said bonding material said bonded portions to a creping surface, and
- differentially creping said web from said creping surface to form said sheet material.
1 more element
A method of forming a strong, soft, fibrous sheet material having substantial stretch in all directions in its own plane, comprising:
- forming a web by deposition from an aqueous slurry of lignocellulosic fibers to have a basis weight of from about 10 to about 30 lbs./ream of 2,880 square feet, said web formed under conditions of reduced pressing until substantially dried to reduce the amount of interfiber contact and interfiber bonding strength in the web,
- applying a bonding material to one surface of said web in a quantity to result in said sheet material having at least about 1.4% non-volatile constituents of bonding material based on the dry web weight of said sheet material, and in a continuous reticular, fine pattern which leaves at least 65% of said surface of said web free from said bonding material, said bonding material penetrating only partly into the thickness of said web to form bonded web portions in said sheet material in which fibers are bonded together by said bonding material,
- bringing said one surfface of said web into engagement with a creping surface to adhere only said bonded web portions to said creping surface with said bonding material, and
- creping said web from said creping surface to form said sheet material.
1 more element
A method of forming a strong, soft, fibrous sheet material having substantial stretch in all directions in its own plane, comprising:
- (i) providing a web which comprises a matrix of cellulosic fibers, said web being characterized by such reduced interfiber bonding strength as to have inadequate structural integrity for sanitary wiping purposes, and said web being primarily cellulosic fibers having a length of less than 1/4 inch and having a basis weight of from about 5 to about 55 lbs. per ream of 2880 square feet,
- (ii) applying an interfiber bonding amount of bonding material to one surface of said web in a fine pattern which leaves a substantial portion of said surface of said web free from said bonding material, to form bonded portions in said sheet material in which fibers are bonded together by said bonding material to contribute to the strength of said sheet material and impart structural integrity thereto, said bonding material including a curable component and penetrating said web at least part way through the thickness of said web,
- (iii) adhering with said bonding material said bonded portions of said web to a creping surface,
- (iv) differentially creping said web from said creping surface to form said sheet material having structural integrity imparted by said bonding material, which interfiber bonding amount of bonding material effects formation of essentially no hard or brittle interfiber bonds of natural interfiber bonding type, and
- (v) curing said curable component in said bonding material after creping said web.
2 more elements
Dependencies are inferred from the claim text.