Tissue products containing microalgae materials
View Patent ↗Dry products, and particularly dry tissue substrates, including a blend of conventional papermaking fibers and microalgae are disclosed herein. Use of a cationic retention aid in the dry tissue substrates helps to provide a tissue sheet retaining the microalgae without being detrimental to tissue properties such as caliper, bulk, air permeability, slough and absorbent capacity. Additionally, use of a flocculating agent may agglomerate the microalgae and make it easier to retain the microalgae within the tissue sheet.
1. A tissue basesheet comprising:
a blend of conventional papermaking fibers and microalgae; and
a cationic retention aid selected from polydiallyldimethylammonium chlorides and branched polyacrylamides;
a flocculating agent selected from the group consisting of a cationic starch, an amphoteric starch and a polyvinylamine or derivative thereof;
said tissue basesheet comprising between about 1 and about 50 percent based on total weight of the tissue product of the microalgae and wherein the tissue basesheet has a basis weight less than about 60 grams per square meter and a bulk greater than about 10 cc/g.
2. The tissue basesheet of claim 1 wherein the microalgae is biomeal from algal biofuel production.
3. The tissue basesheet of claim 1 comprising less than about 5 percent of flocculating agent based on weight of the microalgae.
4. The tissue basesheet of claim 1 wherein the microalgae are selected from non-motile unicellular algae, flagellates, diatoms and blue-green algae.
5. The tissue basesheet of claim 1 comprising between about 10 and about 40 percent based on total weight of the tissue product of the microalgae.
6. The tissue basesheet of claim 1 comprising between about 10 and about 30 percent based on total weight of the tissue product of the microalgae.
7. The tissue basesheet of claim 1 wherein the tissue product has a specific absorbent capacity of about 8 g/g or greater.
8. The tissue basesheet of claim 1 wherein the tissue product has a geometric mean dry tensile strength greater than about 500 g/3″.
9. A tissue product comprising one or more plies of the tissue basesheet of claim 1 .
10. The tissue product of claim 9 wherein the tissue product is a bath tissue, a facial tissue, a paper towel or a napkin.
11. A method of making a tissue basesheet in a wet-end stock system including a chest and a head box comprising:
a. combining microalgae fibrous material with conventional papermaking fibers in a wet state to produce a microalgae/papermaking fiber blend;
b. adding a cationic retention aid selected from polydiallyldimethylammonium chlorides and branched polyacrylamides and a flocculating agent selected from the group consisting of a cationic starch, an amphoteric starch and a polyvinylamine or derivative thereof to the microalgae/papermaking fiber blend between the chest and the headbox;
c. drying the web to form a tissue basesheet wherein the tissue basesheet has a basis weight less than about 60 grams per square meter and a bulk greater than about 10 cc/g.
12. The method of claim 11 wherein the microalgae is biomeal from algal biofuel production.
13. The method of claim 11 wherein the cationic retention aid is added at an outlet stream of a chest fan pump.
14. The method of claim 12 wherein the tissue product comprises less than about 5 percent of flocculating agent based on weight of the microalgae.
15. The method of claim 11 wherein the microalgae are selected from non-motile unicellular algae, flagellates, diatoms and blue-green algae.
16. The method of claim 11 wherein the tissue basesheet comprises between about 10 and about 50 percent based on total weight of the tissue product of the microalgae.
17. The method of claim 11 wherein the tissue basesheet comprises between about 10 and about 40 percent based on total weight of the tissue product of the microalgae.
18. The method of claim 11 wherein the tissue basesheet has a specific absorbent capacity of about 8 g/g or greater.
19. The method of claim 11 wherein the tissue basesheet comprises a geometric mean tensile strength greater than about 400 g/3″.