Creping methods using pH-modified creping adhesive compositions
AssigneeBuckman Laboratories International, Inc.
InventorsPatrick Sullivan, Jack Allen
Life of this patent
Estimating the term…
Abstract
A method for manufacturing a creped fiber web is provided and includes providing a rotating cylindrical dryer surface, providing a creping adhesive composition or coating package having a pH boosted at least 0.5 pH units relative to its original base formulation pH in the range of from about 4.5 to about 9, for chemically setting a crosslinkable polymer component at least in part before applying the creping adhesive composition to the rotating cylindrical dryer surface to provide an adhesive dryer surface on which a fiber web can be transferred, dried, and creped.
Claims22
A process for manufacturing a creped fiber web, comprising:
- providing a rotating cylindrical dryer including a dryer surface;
- providing a coating applicator fluidly connected to a supply or feed;
- providing an adhesive base formulation in the supply or feed comprising a crosslinkable polymer, in an aqueous medium having an acidic pH, wherein the adhesive base formulation has a first pH value, wherein the first pH value is from about 3.5 to about 8.5;
- adding a pH modifier to said adhesive base formulation to provide a creping adhesive composition having a second pH value, wherein the second pH value is at least about 0.5 pH units greater than the first pH value, wherein said adding of said pH modifier comprises introducing said pH modifier as a premixture with water to a mixing vessel, to make-up water, to a feed going to a boom, or a return to a mixing vessel, or any combination thereof;
- applying said creping adhesive composition to the dryer surface with the coating applicator to provide an adhesive dryer surface;
- conveying a fibrous web into contact with the adhesive dryer surface;
- drying the fiber web on said adhesive dryer surface to form a dried fiber web;
- and
- creping the dried fiber web from said adhesive dryer surface,
- wherein the adding of the pH modifier to said adhesive base formulation is effective for chemically setting at least a portion of the crosslinkable polymer to form a crosslinked polymer before the creping adhesive composition contacts the dryer surface.
A process of making creped fiber web, comprising:
- increasing the pH of an adhesive base formulation that is to be used on a dryer surface, wherein said adhesive base formulation comprises at least one crosslinkable polymer, wherein the adhesive base formulation has a first pH value that is from about 4.5 to about 8.5, and said increasing of the pH is by at least about 0.5 pH units greater than the first pH value so as to form a creping adhesive composition, and
- applying said adhesive base formulation to the dryer surface with a spray boom and said increasing of the pH occurs in a mixing pot, make-up water, or a feed line to said spray boom prior to said applying with the spray boom;
- conveying a fibrous web into contact with the dryer surface having said adhesive base formulation;
- drying the fiber web to form a dried fiber web;
- creping the dried fiber web;
- and
- wherein the adding of the pH modifier to said adhesive base formulation is effective for chemically setting at least a portion of the crosslinkable polymer to form a crosslinked polymer before the adhesive base formulation contacts the dryer surface.
Dependencies are inferred from the claim text.