Claims
- 1. A process for the manufacture of a soft, single-ply tissue product having a basis weight of at least about 15 lbs./3,000 square feet ream and having low sidedness which process comprises:
- providing a moving foraminous support;
- providing a headbox adjacent said moving foraminous support adapted to form a nascent web by depositing furnish upon said moving foraminous support;
- providing wet pressing means operatively connected to said moving foraminous support to receive said nascent web and for dewatering of said nascent web by overall compaction thereof,
- providing a Yankee dryer operatively connected to said wet pressing means and adopted to receive and dry the dewatered nascent web;
- supplying a furnish to said headbox comprising cationic temporary wet strength agents, nitrogenous softener/debonder and cellulosic papermaking fibers chosen from the group consisting hardwood, softwood, and recycled fibers;
- controlling the overall concentration of the aldehyde-containing cationic temporary wet strength agent and the cationic nitrogenous softener/debonder in said nascent web to between about 1 to about 20 lbs./ton on a dry fiber basis, the weight ratio of the wet strength agent to the softener debonder being controlled to be within the range of about 0.5 to about 10.0;
- wet pressing said nascent web;
- transferring said nascent web to said Yankee dryer, adhering said web to said Yankee, and creping said web from said Yankee;
- embossing said creped web;
- recovering a creped and embossed, dried tissue product; and
- forming a roll of a single-ply tissue;
- controlling the relative amounts of the temporary wet strength agent and the nitrogenous softener/debonder such that said dried tissue exhibits:
- a specific total tensile strength of between 40 and 75 grams per 3 inches per pound per 3000 square feet ream, a cross direction specific wet tensile strength of between 2.75 and 7.5 grams per 3 inches per pound per 3000 square feet ream, the ratio of MD tensile to CD tensile of between 1.25 and 2.75, a specific geometric mean tensile stiffness of between 0.5 and 1.2 grams per inch per percent strain per pound per 3000 square feet ream, a friction deviation of less than 0.225, and a sidedness parameter of less than 0.275.
- 2. The process of claim 1 wherein the softener is a dialkyl dimethyl fatty quaternary ammonium compound of the following structure: ##STR8## wherein R and R.sup.1 are the same or different and are aliphatic hydrocarbons selected from the following: C.sub.16 H.sub.35 and C.sub.18 H.sub.37.
- 3. The process of claim 2 wherein R and R.sup.1 are the same or different and have fourteen to twenty carbon atoms.
- 4. A process for the manufacture of a soft, single-ply tissue product having a basis weight of at least about 15 lbs./3,000 square feet ream and having low sidedness which process comprises:
- providing a moving foraminous support;
- providing a headbox adjacent said moving foraminous support adapted to form a nascent web by depositing furnish upon said moving foraminous support;
- providing wet pressing means operatively connected to said moving foraminous support to receive said nascent web and for dewatering of said nascent web by overall compaction thereof,
- providing a Yankee dryer operatively connected to said wet pressing means and adapted to receive and dry the dewatered nascent web,
- supplying a furnish to said headbox comprising cationic aldehyde containing temporary wet strength agents, nitrogenous softener/debonder and cellulosic papermaking fibers chosen from the group consisting hardwood, softwood, and recycled fibers;
- controlling the overall concentration of the aldehyde-containing cationic temporary wet strength agent and the cationic nitrogenous softener/debonder in said nascent web to between about 1 to about 20 lbs./ton on a dry fiber basis, the weight ratio of the wet strength agent to the softener debonder being controlled to be within the range of about 0. 5 to about 10.0;
- wet pressing said nascent web;
- transferring said nascent web to said Yankee dryer, adhering said web to said Yankee, and creping said web from said Yankee;
- embossing said creped web
- recovering a creped and embossed, dried bathroom tissue product; and
- forming a roll of a single-ply tissue;
- controlling the relative amounts of the temporary wet strength agent and the nitrogenous softener/debonder such that said dried tissue exhibits:
- a specific total tensile strength of between 40 and 75 grams per 3 inches per pound per 3000 square feet ream, a cross direction specific wet tensile strength of between 2.75 and 7.5 grams per 3 inches per pound per 3000 square feet ream, the ratio of MD tensile to CD tensile of between 1.25 and 2.75, a specific geometric mean tensile stiffness of between 0.5 and 1.2 grams per inch per percent strain per pound per 3000 square feet ream, a friction deviation of less than 0.225, and a sidedness parameter of less than 0.275.
- 5. The process of claim 1 or claim 4 wherein the temporary wet strength agent is in the form of a cationic water soluble organic polymer having aldehyde groups in its moiety.
- 6. The process of claim 5 wherein the temporary wet strength agent is a cationic water soluble starch having aldehyde groups in its moiety.
- 7. The process of claim 4 wherein the softener is added to the furnish.
- 8. The process of claim 4 wherein the softener is an imidazoline moiety which has a melting point of about 0-40.degree. C. in a hydrocarbon selected from the group consisting of aliphatic polyols, aliphatic diols, alkoxylated polyols, alkoxylated aliphatic diols, and mixtures of these compounds.
- 9. The process of claim 8 wherein the softener is dispersible in water at a temperature of about 1.degree. C. to about 40.degree. C.
- 10. The process of claim 8 wherein the imidazoline moiety is of the following formula: ##STR9## wherein X is an anion and R is selected from the group of saturated and unsaturated paraffinic moieties having a carbon chain of C.sub.12 to C.sub.20 and R.sup.1 is selected from the groups of methyl and ethyl moieties.
- 11. The process of claim 10 wherein X is methyl sulfate.
- 12. The process of claim 10 wherein X is the chloride ion.
- 13. The process of claim 10 wherein R has a carbon chain length of C.sub.12 to C.sub.18.
- 14. The process of claim 13 wherein R has a chain length of C.sub.18.
- 15. The process of claim 8 wherein the diol is 2,2,4 trimethyl 1,3 pentane diol.
- 16. The process of claim 8 wherein alkoxylated diol is ethoxylated 2,2,4 trimethyl 1,3 pentane diol.
- 17. A process for the manufacture of a soft, single-ply tissue product having a basis weight of at least about 15 lbs./3,000 square feet ream and having low sidedness which process comprises:
- providing a moving foraminous support,
- providing a headbox adjacent said moving foraminous support adapted to form a nascent web by depositing furnish upon said moving foraminous support;
- providing wet pressing means operatively connected to said moving foraminous support to receive said nascent web and for dewatering of said nascent web by overall compaction thereof;
- providing a Yankee dryer operatively connected to said moving foraminous support and said wet pressing means and adapted to receive and dry the dewatered nascent web;
- supplying a furnish to said headbox comprising cellulosic papermaking fibers chosen from the group consisting of hardwood, softwood, and recycled fibers;
- spraying uncharged aldehyde containing wet strength agents and cationic softeners/debonders on the web;
- controlling the overall concentration of the uncharged aldehyde-containing temporary wet strength agents and the cationic nitrogenous softener/debonder in the web to between about 1 to about 20 lbs./ton on a dry fiber basis, the weight ratio of the wet strength agent to the softener/debonder being controlled to be within the range of about 0. 5 to about 10;
- wet pressing said nascent web;
- transferring said nascent web to said Yankee dryer, adhering said web to said Yankee, and creping said web from said Yankee;
- embossing said creped web;
- recovering a creped and embossed, dried bathroom tissue product; and
- forming a roll of a single-ply tissue;
- controlling the relative amounts of the temporary wet strength agent and the nitrogenous softener/debonder such that said dried tissue exhibits:
- a specific total tensile strength of between 40 and 75 grams per 3 inches per pound per 3000 square feet ream, a cross direction specific wet tensile strength of between 2.75 and 7.5 grams per 3 inches per pound per 3000 square feet ream, the ratio of MD tensile to CD tensile of between 1.25 and 2.75, a specific geometric mean tensile stiffness of between 0.5 and 1.2 grams per inch per percent strain per pound per 3000 square feet ream, a friction deviation of less than 0.225, and a sidedness parameter of less than 0.275.
- 18. The process of claim 17 wherein the uncharged aldehyde containing temporary wet strength agent is glyoxal.
Parent Case Info
This application is a divisional of application Ser. No. 08/772,435, filed Dec. 23, 1996.
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Divisions (1)
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Number |
Date |
Country |
Parent |
772435 |
Dec 1996 |
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