Method of controlling adhesive build-up on a yankee dryer
AssigneeGeorgia-Pacific Consumer Products LP
InventorsHung Liang Chou, Kang Chang Yeh
Life of this patent
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Abstract
An improved method of controlling build-up of adhesive coating on a Yankee drying cylinder preferably includes intermittently: (a) increasing the add-on rate of resinous adhesive to the drying cylinder substantially above the steady-state add-on rate; (b) segregating the absorbent sheet product produced while the add-on rate of resinous adhesive to the drying cylinder is elevated above the steady-state add-on rate from absorbent sheet product accumulated during steady-state operation; and (c) while the add-on rate of resinous adhesive to the drying cylinder is increased above the steady-state add-on rate, stripping at least a portion of the adhesive coating from the drying cylinder with a cleaning doctor.
Claims51
In a continuous process of manufacturing absorbent sheet of the class used for tissue and towel including forming a wet cellulosic web, applying the web onto a drying cylinder of a dryer, which drying cylinder is provided with a resinous adhesive at a substantially constant add-on rate during steady-state operation and accumulating absorbent sheet on a reel, the improvement comprising controlling build-up of an adhesive coating on the drying cylinder by way of intermittently:
- (a) increasing the add-on rate of resinous adhesive to the drying cylinder above the steady-state add-on rate;
- (b) segregating absorbent sheet product produced while the add-on rate of resinous adhesive to the drying cylinder is elevated above the steady-state add-on rate from absorbent sheet product accumulated on the reel during steady-state operation;
- and
- (c) while the add-on rate of resinous adhesive to the drying cylinder is increased above the steady-state add-on rate, stripping at least a portion of the adhesive coating from the drying cylinder with a cleaning doctor.
In a continuous process of manufacturing absorbent sheet of the class used for tissue and towel including forming a wet cellulosic web, applying the web onto a drying cylinder of a dryer, which drying cylinder is provided with a resinous adhesive comprising a polyvinyl alcohol adhesive resin at a substantially constant add-on rate during steady-state operation, the improvement comprising controlling build-up of an adhesive coating on the drying cylinder by way of intermittently:
- (a) increasing the add-on rate of polyvinyl alcohol adhesive resin to the drying cylinder above the steady-state add-on rate;
- and
- (b) while the add-on rate of polyvinyl alcohol adhesive resin to the drying cylinder is increased above the steady-state add-on rate, stripping at least a portion of the adhesive coating from the drying cylinder with a cleaning doctor.
In a continuous process of manufacturing absorbent sheet of the class used for tissue and towel including forming a wet cellulosic web, applying the web onto a drying cylinder of a dryer, which drying cylinder is provided with a resinous adhesive at a substantially constant add-on rate during steady-state operation, wherein the resin adhesive consists essentially of a PVOH resin and an epihalohydrin resin in substantially fixed proportion in steady-state operation and the dryer is further provided with a dryer hood capable of variable temperature, the improvement comprising controlling build-up of an adhesive coating on the drying cylinder by way of stripping at least a portion of the adhesive coating from the drying cylinder with a cleaning doctor while controlling wet-tack to the drying cylinder by way of a technique selected from the group consisting of:
- (a) lowering the hood temperature before stripping the coating;
- (b) changing the resinous adhesive composition before stripping the coating;
- and
- (c) increasing the add-on rate of resinous adhesive above the steady-state add-on rate before stripping the coating.
In a continuous process of manufacturing absorbent sheet of the class used for tissue and towel including forming a wet cellulosic web, applying the web onto a drying cylinder of a Yankee dryer, which drying cylinder is provided with a resinous adhesive at a substantially constant add-on rate during steady-state operation and which Yankee dryer is provided with a dryer hood capable of variable temperature, the improvement comprising controlling build-up of an adhesive coating on the drying cylinder by way of intermittently:
- (a) stripping at least a portion of the adhesive coating from the drying cylinder with a cleaning doctor, and
- (b) while stripping at least a portion of the adhesive coating from the drying cylinder, controlling the temperature of the dryer such that the adhesive coating temperature does not exceed about 300° F. contemporaneously with the step of stripping adhesive from the drying cylinder.
in a continuous process of manufacturing absorbent sheet of the class used for tissue and towel including forming a wet cellulosic web, applying the web onto a drying cylinder of a Yankee dryer which drying cylinder is provided with a resinous adhesive at a substantially constant add-on rate during steady-state operation and which Yankee dryer is provided with a dryer hood capable of variable temperature, the improvement comprising controlling build-up of an adhesive coating on the drying cylinder by way of intermittently:
- (a) stripping at least a portion of the adhesive coating from the drying cylinder with a cleaning doctor;
- (b) while stripping at least a portion of the adhesive coating from the drying cylinder controlling the temperature of the dryer such that the adhesive coating temperature does not exceed about 300° F. contemporaneously with the step of stripping adhesive from the drying cylinder;
- and
- (c) segregating product produced contemporaneously with stripping a portion of the coating from the drying cylinder from product produced during steady-state operation.
A continuous process for producing absorbent sheet comprising:
- (a) forming a wet cellulosic web;
- (b) at least partially dewatering the wet web;
- (c) adhering the web to a drying cylinder with a resinous adhesive coating composition applied at a substantially constant add-on rate during steady-state operation;
- (d) drying the web on the drying cylinder;
- (e) peeling the web from the drying cylinder under steady-state tension;
- and
- (f) winding the peeled web under steady-state tension to take up reel operating at a steady-state speed,
- wherein build-up of adhesive on the drying cylinder is controlled by way of intermittently:
- (g) increasing the add-on rate of resinous adhesive to the drying cylinder above the steady-state add-on rate;
- and
- (h) while the add-on rate of resinous adhesive to the drying cylinder is increased above the steady-state add-on rate, stripping at least a portion of the adhesive coating from the drying cylinder with a cleaning doctor.
A continuous process for producing absorbent sheet comprising:
- (a) forming a wet cellulosic web;
- (b) at least partially dewatering the wet web;
- (c) adhering the web to a drying cylinder with a resinous adhesive coating composition applied at a substantially constant add-on rate during steady-state operation;
- (d) drying the web on the drying cylinder;
- (e) peeling the web from the drying cylinder under steady-state tension:
- and
- (f) winding the peeled web under steady-state tension to take up reel operating at a steady-state speed,
- wherein build-up of adhesive on the drying cylinder is controlled by way of intermittently;
- (g) increasing the add-on rate of resinous adhesive to the drying cylinder above the steady-state add-on rate;
- (h) while the add-on rate of resinous adhesive to the drying cylinder is increased above the steady-state add-on rate, stripping at least a portion of the adhesive coating from the drying cylinder with cleaning doctor:
- and
- (i) segregating product produced contemporaneously with stripping a portion of the coating from the drying cylinder from product produced during steady-state operation.
A continuous process for producing absorbent sheet comprising:
- (a) forming a wet cellulosic web;
- (b) at least partially dewatering the wet web;
- (c) transferring the partially dewatered web to a textured fabric;
- (d) texturing the wet web by conforming it to the textured fabric;
- (e) transferring the wet web to a drying cylinder;
- (f) adhering the web to a drying cylinder with a resinous adhesive coating composition applied at a substantially constant add-on rate during steady-state operation;
- and
- (g) drying the wet web on the drying cylinder;
- wherein the build-up of adhesive on the drying cylinder is controlled by way of intermittently:
- (h) increasing the add-on rate of resinous adhesive to the drying cylinder above the steady-state add-on rate;
- and
- (i) while the add-on rate of resinous adhesive to the drying cylinder is increased above the steady-state add-on rate, stripping at least a portion of the adhesive coating from the drying cylinder with a cleaning doctor.
A continuous process for producing absorbent sheet comprising:
- (a) forming a wet cellulosic web:
- (b) at least partially dewatering the wet web;
- (c) transferring the partially dewatered web to a textured fabric;
- (d) texturing the wet web by conforming it to the textured fabric;
- (e) transferring the wet web to a drying cylinder;
- (f) adhering the web to a drying cylinder with a resinous adhesive coating composition applied at a substantially constant add-on rate during steady-state operation:
- and
- (g) drying the wet web on the drying cylinder;
- wherein the build-up of adhesive on the drying cylinder is controlled by way of intermittently;
- (h) increasing the add-on rate of resinous adhesive to the drying cylinder above the steady-state add-on rate;
- (i) while the add-on rate of resinous adhesive to the drying cylinder is increased above the steady-state add-on rate, stripping at least a portion of the adhesive coating from the drying cylinder with a cleaning doctor:
- and
- (j) segregating product produced contemporaneously with stripping a portion of the coating from the drying cylinder from product produced during steady-state operation.
In a continuous process of manufacturing absorbent sheet of the class used for tissue and towel including forming a wet cellulosic web, applying the web onto a drying cylinder of a dryer, which drying cylinder is provided with a resinous adhesive at a substantially constant add-on rate during steady-state operation and accumulating the absorbent sheet on a reel, the improvement comprising controlling build-up of an adhesive coating on the drying cylinder by way of intermittently:
- (a) increasing the add-on rate of resinous adhesive to the drying cylinder above the steady-state add-on rate;
- (b) segregating the absorbent sheet product produced while the add-on rate of resinous adhesive to the drying cylinder is elevated above the steady-state add-on rate from the absorbent sheet product accumulated on the reel during steady-state operation;
- and
- (c) while the add-on rate of resinous adhesive to the drying cylinder is increased above the steady-state add-on rate, stripping at least a portion of the adhesive coating from the drying cylinder with a cleaning doctor;
- and
- (d) while the add-on rate of resinous adhesive to the drying cylinder is increased above the steady-state add-on rate, creping the web from the drying cylinder.
In a continuous process of manufacturing absorbent sheet of the class used for tissue and towel including fanning a wet cellulosic web, applying the web onto a drying cylinder of a dryer which drying cylinder is provided with a resinous adhesive at a substantially constant add-on rate during steady-state operation and accumulating the absorbent sheet on a reel, the improvement comprising controlling build-up of an adhesive coating on the drying cylinder by way of intermittently:
- (a) increasing the add-on rate of resinous adhesive to the drying cylinder above the steady-state add-on rate;
- (b) segregating the absorbent sheet product produced while the add-on rate of resinous adhesive to the drying cylinder is elevated above the steady-state add-on rate from the absorbent sheet product accumulated on the reel during steady-state operation:
- and
- (c) while the add-on rate of resinous adhesive to the drying cylinder is increased above the steady-state add-on rate, stripping at least a portion of the adhesive coating from the drying cylinder with a cleaning doctor;
- (d) while the add-on rate of resinous adhesive to the drying cylinder is increased above the steady-state add-on rate creping the web from the drying cylinder, and
- (e) segregating product produced contemporaneously with stripping a portion of the coating from the drying cylinder from product produced during steady-state operation.
In a continuous process of manufacturing absorbent sheet of the class used for tissue and towel including forming a wet cellulosic web, applying the web onto a drying cylinder of a dryer which drying cylinder is provided with a resinous adhesive at a substantially constant add-on rate during steady-state operation and accumulating the absorbent sheet on a reel, the improvement comprising controlling build-up of an adhesive coating on the drying cylinder by way of intermittently:
- (a) increasing the add-on rate of resinous adhesive to the drying cylinder above the steady-state add-on rate;
- (b) segregating the absorbent sheet product produced while the add-on rate of resinous adhesive to the drying cylinder is elevated above the steady-state add-on rate from the absorbent sheet product accumulated on the reel during steady-state operation;
- and
- (c) while the add-on rate of resinous adhesive to the drying cylinder is increased above the steady-state add-on rate stripping at least a portion of the adhesive coating from the drying cylinder with a cleaning doctor;
- (d) while the add-on rate of resinous adhesive to the drying cylinder is increased above the steady-state add-on rate creping the web from the drying cylinder;
- and
- (e) wherein the dryer is provided with a dryer hood capable of variable temperature and the temperature of the dryer hood is lowered during the step of stripping resinous adhesive from the drying cylinder.
Dependencies are inferred from the claim text.