Paper towels having bulky inner layer

• US 5,087,324 A
• Filed: 10/31/1990
• Issued: 02/11/1992
• Est. Priority Date: 10/31/1990
• Status: Expired due to Term

• Current Assignee: Georgia-Pacific Consumer Products LP (KOCH Industries Incorporated)
• Original Assignee: James River Corporation of Virginia (KOCH Industries Incorporated)
• Inventors: Harper, Frank D., Awofeso, Anthony O.
• Primary Examiner(s): Chin, Peter
• Application Number:
  US07/606,900
• Time in Patent Office: 468 Days
• Field of Search: 162/9, 162/22, 162/21, 162/13, 162/100, 162/111, 162/112, 162/113, 162/129, 162/130, 162/157.6, 162/142, 162/150, 162/146, 162/149
• US Class Current: 162/111
• CPC Class Codes: D21F 11/04 paper or board consisting on two or more layers
• CPC Class Codes: D21F 11/14 Making cellulose wadding, filter or blotting paper
• CPC Class Codes: D21H 11/02 Chemical or chemomechanical or chemothermomechanical pulp
• CPC Class Codes: D21H 11/04 Kraft or sulfate pulp
• CPC Class Codes: D21H 25/005 Mechanical treatment D21H25/08, D21H25/18 take precedence
• CPC Class Codes: D21H 27/38 at least one of the sheets having a fibrous composition differing from that of other sheets

Abstract

A delaminated stratified paper towel includes a dense first layer of chemical fiber blend and a second layer of a bulky anfractuous fiber blend unitary with the first layer. The first and second layers enhance a rate of absorption and water holding capacity of the paper towel. In a preferred embodiment, the second layer is a fiber blend having a high bulk softwood fiber and a chemi-thermomechanical pulp. A method of forming a delaminated stratified web of paper towel material includes supplying a first furnish directly to a wire and supplying a second furnish of a bulky anfractuous fiber blend directly onto the first furnish disposed on the wire. Drying the first and second furnishes forms a web of paper towel material having a predetermined dryness. The web of paper towel material is thereafter creped off of the drying device and embossed to a predetermined emboss depth. The web of paper towel material has an enhanced rate of absorption and water holding capacity.

Claims

1. A delaminated stratified paper towel comprising:

a first layer of chemical fiber blend; and

a second layer of an anfractuous high bulk softwood fiber blend, unitary with said first layer;

said first layer being constructed of a denser chemical softwood and hardwood fiber blend relative to said second layer;

said second layer having approximately 30% to 43% of the anfractuous fiber and approximately 57% to 70% of long mechanical pulp fiber;

wherein said first and second layers enhance a rate of absorption and water capacity as compared to a towel of equal strength not having a layer of anfractuous fiber blend.

2. The delaminated stratified paper towel according to claim 1, wherein said second layer is a fiber blend of the anfractuous fiber and a fiber derived from chemi-thermomechanical pulp.

3. The delaminated stratified paper towel according to claim 2, wherein said anfractuous fiber is a citric acid treated fiber.

4. The delaminated stratified paper towel according to claim 1, wherein the weight of the first layer is approximately 65% of the total weight of the paper towel and the second layer, approximately 35%.

5. The delaminated stratified paper towel according to claim 4, wherein the first layer includes approximately 70% Kraft softwood and approximately 30% Kraft hardwood by weight.

6. The delaminated stratified paper towel according to claim 1, wherein the average water holding capacity of each ply of the paper towel is approximately 9.5 gm/gm.

7. The delaminated stratified paper towel according to claim 6, wherein the average water absorption time of each ply of the finished paper towel is approximately 11 seconds.

8. The delaminated stratified paper towel according to claim 1, wherein two plies of the paper towel are embossed together to an emboss depth of approximately 0.2286 cm, the water holding capacity of the paper towel being approximately 12.4 gm/gm.

10. The delaminated stratified paper towel according to claim 1, and further including a third layer of fiber blend wherein said second layer is disposed between said first and third layers.

11. The delaminated stratified paper towel according to claim 10, wherein the total weight of the first and third layers is approximately 65% of the total weight of the paper towel and the second layer, approximately 35%.

13. The delaminated stratified paper towel according to claim 11, wherein the anfractuous fiber is a citric acid treated fiber.

9. The delaminated stratified paper towel according to claim 9, wherein the average water absorption time is approximately 0.8 seconds.

12. The delaminated stratified paper towel according to claim 12, wherein the first and third layers include approximately 70% Kraft softwood and approximately 30% Kraft hardwood by weight.

14. A method of forming a delaminated stratified web of paper towel material comprising:

supplying a first aqueous furnish of a blend of chemical softwood and hardwood fiber directly to a wire;

supplying a second aqueous furnish of an anfractuous high bulk softwood fiber blend having approximately 30% to 43% of the anfractuous fiber and approximately 57% to 70% of long mechanical pulp fiber onto the first furnish disposed on the wire;

drying the first and second furnishes on a drying means to form a web of paper towel material having a predetermined dryness;

creping the paper towel material off of the drying means; and

embossing the paper towel material to a predetermined emboss depth;

wherein the web of paper towel material has an enhanced rate of absorption and water holding capacity as compared to a towel of equal strength not having a layer of bulky anfractuous fiber blend.

15. The method of forming a delaminated stratified web of paper towel material according to claim 14, wherein said second furnish is a fiber blend of the anfractuous fiber and a fiber derived from chemi-thermomechanical pulp.

16. The method of forming a delaminated stratified web of paper towel material according to claim 15, wherein said anfractuous fiber is a citric acid treated fiber.

17. The method of forming a delaminated stratified web of paper towel material according to claim 14, wherein the weight of the layer resulting from the first furnish is approximately 65% of the weight of the paper towel material and the second layer, approximately 35%.

18. The method of forming a delaminated stratified web of paper towel material according to claim 19, wherein the first furnish includes approximately 70% Kraft softwood and approximately 30% Kraft hardwood by weight.