Fiber web product and manufacturing method of the same
A fiber web containing hardwood pulp is impregnated with a chemical solution that contains a moisturizing component such as glycerin, moisture, an oily component such as hydrocarbons, and a vegetable powder such as corn starch. The vegetable powder enters between pulp fibers of the fiber web in which hydrogen bonds are relaxed by the moisturizing component and the oily component, thereby spontaneously raising some of the pulp fibers in a surface of the fiber web. Accordingly, a fiber web product that is excellent in texture characteristics such as a smooth raised feeling, softness, and moistness, generates less dust such as powder or pulp fibers, and has sufficient strength, and a manufacturing method of the same are provided.
1. A fiber web product comprising a fiber web that contains hardwood pulp and is impregnated with a chemical solution, the chemical solution containing a moisturizing component, moisture, an oily component, and a vegetable powder containing starch,
wherein the fiber web contains 50 wt % or more of the hardwood pulp;
wherein an average particle diameter of the vegetable powder is 5 to 30 μm; and
wherein a blending ratio of the moisturizing component, the moisture, the oily component, and the vegetable powder in the chemical solution at 23° C. and a relative humidity of 50% is as follows:
moisturizing component: 1;
moisture: 0.05 to 1.0;
oily component: 0.01 to 1.0; and
vegetable powder: 0.01 to 1.0.
2. The fiber web product according to claim 1 , wherein the fiber web is dry crepe paper.
3. The fiber web product according to claim 2 , wherein the fiber web contains 90 wt % or more of the hardwood pulp.
4. The fiber web product according to claim 2 , wherein the moisturizing component contains glycerin.
5. The fiber web product according to claim 2 , wherein the oily component contains hydrocarbons.
6. The fiber web product according to claim 2 , wherein the starch is corn starch.
7. The fiber web product according to claim 2 , wherein an average particle diameter of the vegetable powder is 2 to 50 μm.
8. The fiber web product according to claim 2 , wherein the blending ratio of the moisturizing component, the moisture, the oily component, and the vegetable powder in the chemical solution at 23° C. and a relative humidity of 50% is as follows:
moisturizing component: 1;
moisture: 0.1 to 0.5;
oily component: 0.03 to 0.5; and
vegetable powder: 0.03 to 0.5.
9. The fiber web product according to claim 2 , wherein the vegetable powder intervenes between pulp fibers of the fiber web in which hydrogen bonds are relaxed by the moisturizing component and the oily component, to raise the pulp fibers.
10. The fiber web product according to claim 1 , wherein the fiber web contains 90 wt % or more of the hardwood pulp.
11. The fiber web product according to claim 1 , wherein the moisturizing component contains glycerin.
12. The fiber web product according to claim 1 , wherein the oily component contains hydrocarbons.
13. The fiber web product according to claim 1 , wherein the starch is corn starch.
14. The fiber web product according to claim 1 , wherein an average particle diameter of the vegetable powder is 2 to 50 μm.
15. The fiber web product according to claim 1 , wherein the blending ratio of the moisturizing component, the moisture, the oily component, and the vegetable powder in the chemical solution at 23° C. and a relative humidity of 50% is as follows:
moisturizing component: 1;
moisture: 0.1 to 0.5;
oily component: 0.03 to 0.5; and
vegetable powder: 0.03 to 0.5.
16. The fiber web product according to claim 1 , wherein the vegetable powder intervenes between pulp fibers of the fiber web in which hydrogen bonds are relaxed by the moisturizing component and the oily component, to raise the pulp fibers.
17. The fiber web product according to claim 16 , wherein number of the pulp fibers raised to protrude and have a height of 0.1 mm or more from a surface of the fiber web is 400 or more per 160 mm 2 of a surface area of the fiber web.
18. The fiber web product according to claim 16 , wherein number of particles of dust that contains the vegetable powder or the pulp fibers, is generated from the fiber web, and falls off from the fiber web is 6000 or less per 1800 cm 2 of the surface area of the fiber web.
19. A manufacturing method of a fiber web product, comprising:
preparing a chemical solution containing a moisturizing component, moisture, an oily component, a vegetable powder containing starch, and a surfactant; and
impregnating a fiber web containing hardwood pulp with the chemical solution by spraying or roll coating, and
wherein the fiber web contains 50 wt % or more of the hardwood pulp;
wherein an average particle diameter of the vegetable powder is 5 to 30 μm; and
wherein a blending ratio of the moisturizing component, the moisture, the oily component, and the vegetable powder in the chemical solution at 23° C. and a relative humidity of 50% is as follows:
moisturizing component: 1;
moisture: 0.05 to 1.0;
oily component: 0.01 to 1.0; and
vegetable powder: 0.01 to 1.0.
20. The manufacturing method of a fiber web product according to claim 19 , wherein
the chemical solution is prepared by blending the starch that is the vegetable powder to an emulsion containing the moisturizing component, the moisture, the oily component, and the surfactant while a temperature of the emulsion is maintained at 60° C. or less, and
the fiber web is impregnated with the chemical solution at a temperature of 60° C. or less.