Sanitary Thin Paper and Process for Producing the Same

Abstract

A sanitary thin paper is provided which has an excellent pliability together with an excellent smoothness. Such a paper can be obtained by incorporating a fatty acid ester-based compound and a fatty acid amide-based compound internally and/or externally.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a sanitary thin paper for example for a domestic use and a for producing the same, and provides a particularly soft and smooth sanitary thin paper, including tissue paper or toilet paper. BACKGROUND OF THE INVENTION [0002] In response to a recent change in life style, a trend toward a soft and smooth sanitary thin paper becomes apparent in consumers. Especially in the field of tissue paper, such a trend is marked. [0003] In order to ensure a softness, addition of a quaternary ammonium salt is considered to be effective as disclosed in Patent Reference 1. Also as disclosed in Patent Reference 2, a polysiloxane substance is attempted to be added. [0004] However, a comfortable texture to the touch can not be obtained if only a softness is imparted but no smoothness is associated. In order to obtain the “smoothness” by which the texture is affected, it is proposed to add a lubricant, but it is difficult to find a suitable lu...

AI Technical Summary

Benefits of technology

[0018] According to the invention, the excellence is experienced not only in terms of softness but also in terms of smoothness. The reasons for this excellence may be explained as described below. Thus, since a fatty acid ester-based compound enters between fibers to loosen the fibers, it gives a bulkiness, which is experienced as a softness by a consumer. A fatty acid amide-based compound not only serves to enhance the bulkiness but also gives a moisture-retaining wetness / smoothness. Both of these fatty acid ester-based compound and fatty acid amide-based compound are also known to be preferable especially if they are cationic.

[0019] When such a pulp paper is combined externally with a polyester-based compound, a thin film of the polyester can be formed on the surface of the pulp fiber, which serves to reduce the friction between fibers on a superficial layer upon touch to a skin. Accordingly, a resultant sanitary thin paper is porous, moistening, soft, and its surface is smooth.

[0020] As described above, it is preferable to add a polyester-based compound externally since a thin polyester film is intended to be formed on the pulp fiber surface. A fatty acid ester-based compound is added internally since it is intended to enter between the fibers to loosen the inter-fiber binding. On the contrary, a fatty acid amide-based compound may be added externally, although it exerts a higher effect when added internally.

[0021] On the other hand, the smoothness was found to be related greatly to the crepe morphology. Thus, as shown in FIG. 1, it was found to be preferable that the apex distance L in the machine direction of the crepe (paper) is 0.1 mm or less, and the widthwise length W of the crepe is 0.5 mm or less. An apex distance L of the machine direction of the crepe which is short and 0.1 mm or less gives a smoothness. On the other hand, a widthwise length W of the crepe exceeding 0.5 mm the smoothness upon wiping a skin with a sanitary thin paper while moving in the machine direction is affected adversely.

Problems solved by technology

However, a comfortable texture to the touch can not be obtained if only a softness is imparted but no smoothness is associated.

In order to obtain the “smoothness” by which the texture is affected, it is proposed to add a lubricant, but it is difficult to find a suitable lubricant.

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