Claims
- 1. A process for paper stock comprising:
- (a) forming a cellulose water slurry;
- (b) preheating an alkenyl succinic anhydride, either in neat or in solution, to a temperature of about 30.degree. C. to 60.degree. C. and mixing said alkenyl succinic anhydride with water, said mixture being non-emulsified;
- (c) injecting said mixture as a liquid jet with a piston pump through a nozzle, in droplet form, into said cellulose water slurry, before the formation of a dry paper web, said piston pump generating a pressure of about 50 atmospheres to about 300 atmospheres, said pressure sufficiently great to create a pressure differential between said size and said paper stock, said differential accelerating disintegration of the liquid jet and increasing contact between the size and paper stock, said increased contact accelerating the formation of a paper web from said cellulose/water slurry; and
- (d) drying said paper web;
- wherein at least one of the cellulose water slurry and mixture contains a cationizing compound.
- 2. A process according to claim 1 in which the water with which the size is mixed is heated to between 30.degree. C. to 60.degree. C.
- 3. A process according to claim 1 or claim 2 in which the size is injected together with water in the concentration range 0.1-1.0 wt % on cellulose before the formation of a dry paper web.
- 4. A process according to claim 1 in which the water with which the size is mixed also contains a product to encapsulate the size.
- 5. The process of claim 1 wherein said piston pump generates a pressure of about 100-250 kg/cm.sup.2.
- 6. The process of claim 5 wherein said size is mixed in a solution containing gas and said piston operates at about 50-300 atmospheres.
- 7. The process of claim 5 wherein said size is dissolved in an anhydrous aprotic water-soluble inert solvent.
- 8. A process for pumping size into paper stock comprising:
- (a) forming a cellulose water slurry;
- (b) preheating an alkyl ketene dimer, either in neat or in solution, above the melting point of said dimer, said melting point being 40.degree. C., and mixing the preheated dimer with water, said dimer and said water being a non-emulsified mixture;
- (c) injecting said mixture as a liquid jet with a piston pump through a nozzle, in droplet form, into said cellulose water slurry, before the formation of a dry paper web, the piston pump generating sufficiently great pressure of about 50 atmospheres to about 300 atmospheres, to create a pressure differential between said size and said paper stock, that accelerates disintegration of the liquid jet and increases contact between the size and paper stock, said increased contact accelerating the formation of a paper web; wherein the cellulose water slurry and/or size is treated with a cationizing compound; and
- (d) drying said paper web.
- 9. The process of claim 8 wherein said dimer is mixed in a solution containing gas and said piston pump operates at a pressure of about 50-300 atmospheres.
- 10. The process of claim 8 wherein said size is dissolved in an anhydrous aprotic water-soluble inert solvent.
- 11. The process of claim 8 wherein the water with which the size is mixed is heated to between 30.degree. to 60.degree. C.
- 12. The process of claim 8 wherein the size is injected in water at a concentration range 0.1-1.0 wt % on dry cellulose before the formation of a dry paper web.
- 13. The process of claim 8 wherein the cationizing compound is injected together with the size/water mixture.
- 14. The process of claim 8 wherein the water with which the size is mixed further contains an encapsulant for the size.
- 15. A process for sizing a paper stock comprising the steps of:
- (a) forming a cellulose water slurry;
- (b) preheating a sizing agent, either in neat or in solution;
- (c) mixing the preheated sizing agent with water to form a sizing mixture, said sizing mixture being non-emulsified;
- (d) injecting said mixture as a liquid let by means of a piston pump through a nozzle, in droplet form, into said cellulose/water slurry, before the formation of a dry paper web,
- (d) drying said paper web;
- wherein said sizing mixture is injected at a sufficiently great pressure of about 50 atmospheres to about 300 atmospheres; said pressure sufficiently great to generate a pressure differential between said mixture and said paper stock, that accelerates disintegration of the liquid jet and increases contact between the size and paper stock, said increased contact accelerating the formation of said paper web and wherein at least one of said cellulose/water slurry and said sizing mixture contains a cationizing compound.
- 16. The process of claim 15 wherein said size comprises a succinic anhydride, said temperature is about 35.degree.-50.degree. C., and said pressure is about 100-250 kg/cm.sup.2.
- 17. The process of claim 15 wherein said size comprises an alkyl ketene dimer and said temperature is above about 40.degree. C.
- 18. The process of claim 15 wherein said sizing mixture contains a gas and said piston pump operates to generate a pressure of about 50-300 atmospheres.
- 19. The process of claim 15 wherein said size is dissolved in an anhydrous aprotic water-soluble inert solvent.
- 20. The process of claim 15 in which the water with which the size is mixed is heated to between about 30.degree.-60.degree. C.
- 21. The process of claim 15 in which the size is injected with water and at a concentration of about 0.1-1.0 wt % based on the weight of dry cellulose in the slurry.
- 22. The process of claim 15 in which the cationizing compound is injected together with the sizing mixture.
- 23. The process of claim 15 in which the water with which the size is mixed further contains an encapsulant for the sizing agent.
- 24. An apparatus for the injection of size into paper stock in a paper machine comprising: an injector nozzle located at the wet end of said paper machine, a source of preheated size, a low pressure pump which feeds the pre-heated size to a metering pump which pressurizes the pre-heated size to a pressure of about 50 to about 300 atmospheres and which forces the pressurized size through the injector nozzle in the wet end of the machine and into a cellulose stock, said apparatus generating a sufficiently large pressure differential between the size and the paper stock to increase contact between the size and the paper stock.
- 25. An apparatus according to claim 24 in which the injector nozzle injects size into a stream of water which itself feeds into the cellulose stock.
- 26. An apparatus according to claim 24 in which the metering pump is controlled by the rate of paper production.
- 27. An apparatus according to claim 25 in which the metering pump is controlled by the rate of paper production.
- 28. The apparatus of claim 24, wherein the nozzle is immersed in the cellulose stock.
- 29. The apparatus of claim 24, wherein more than one nozzle is used.
Priority Claims (4)
Number |
Date |
Country |
Kind |
9001436 |
Jan 1990 |
GBX |
|
9001437 |
Jan 1990 |
GBX |
|
9008334 |
Apr 1990 |
GBX |
|
9008335 |
Apr 1990 |
GBX |
|
Parent Case Info
This is a continuation of application Ser. No. 07/910,337 filed on Sept. 21, 1992, abandoned.
Foreign Referenced Citations (1)
Number |
Date |
Country |
696673 |
Sep 1953 |
GBX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
910337 |
Sep 1992 |
|