JP2008206918A - Sanitary thin paper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sanitary thin paper with soft and smooth touch. <P>SOLUTION: The sanitary thin paper includes a softening agent containing a material having an alkyl chain bonded to dextrin, which is applied to a thin paper. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to sanitary thin paper, and more particularly to sanitary thin paper suitable for tissue paper, toilet paper, and kitchen paper.

Hygienic thin paper used for products mainly for wiping, wiping, and absorbing body fluids such as tissue paper, toilet paper or kitchen paper is required to be soft and smooth on the surface.
Conventionally, in order to satisfy this requirement, various softening agents (the following Patent Documents 1 and 2, etc.) have been used in this main sanitary thin paper.
Special table 2006-518014 JP 7-109693 A

On the other hand, this main sanitary thin paper is required to be safer and less harmful to the human body because it touches the skin directly, and in recent years it has also had a negative impact on the environment during disposal and recycling. Smallness is also required.
Accordingly, a main object of the present invention is to provide a flexible sanitary thin paper that is safer and less affected by the human body and less affected by the natural environment.

<Invention of Claim 1>
A sanitary thin paper comprising a softening agent containing 5 to 65% by mass of a substance having an alkyl chain bonded to dextrin on the thin paper.

<Invention of Claim 2>
The sanitary thin paper according to claim 1, wherein the softening agent contains 30 to 90% by mass of glycerin.

  According to the present invention as described above, a flexible sanitary thin paper that is safe and has little influence on the human body and has little influence on the natural environment is provided.

Next, embodiments of the present invention will be described in detail below.
The sanitary thin paper of the present invention is obtained by applying a softener containing a substance in which an alkyl chain is bonded to dextrin to a thin paper.
The thin paper before the application of the softening agent is manufactured by making a papermaking raw material containing pulp.
Various types of known paper machines are used for papermaking, which includes at least three parts: a wire part that substantially forms the papermaking material into wet paper, a press part that dehydrates the wet paper, and a dryer part that dries the dehydrated wet paper. Can be used.

The basis weight and thickness of the thin paper are appropriately designed based on known techniques according to the use of the thin paper, for example, tissue paper, toilet paper, and kitchen paper.
For tissue paper and toilet paper use, basis weight 10-40 g / m ² (JIS P 8124), paper thickness 50-800 μm, dry tensile strength in longitudinal direction; 150-800 cN / width 15 mm × length 250 mm, transverse direction 50 to 400 cN / width 15 mm × length 250 mm (JIS P 8113), softness 0.5 to 6.0 g (JIS L1096), MMD 3 to 18 and elongation 5 to 40%.

Pulp used as a raw material for thin paper is mechanical pulp such as groundwood pulp (GP), pressure-rise groundwood pulp (PGW), and thermomechanical pulp (TMP); semi-chemical pulp (CP), high yield untreated bleached kraft Chemical pulps such as pulp (HNKP), softwood bleached kraft pulp (NBKP), hardwood unbleached kraft pulp (LUKP), hardwood bleached kraft pulp (LBKP); waste paper pulp such as deinking pulp (DIP) and waste pulp (WP) Is mentioned.
These pulps can be used alone or in combination of two or more.

Preferably, a chemical pulp containing no filler or foreign matter is preferred, and in particular, one containing more LBKP (also referred to as L material or hardwood pulp) than NBKP (also referred to as N material or softwood pulp) is preferable. That is, a chemical pulp containing no filler having a ratio of NBKP to LBKP (NBKP / LBKP) of 0/100 to 60/40 is particularly suitable. Since NBKP has a larger fiber thickness than LBKP, the more NBKP, the higher the bulk.
Along with the above pulp, woody materials such as straw pulp, bamboo pulp, kenaf pulp, and herbs can also be blended.

In the papermaking raw material, chemical fibers can be blended as fibers other than pulp. When chemical fiber is blended, the wet tensile strength is particularly increased.
Chemical fibers include polyethylene fibers such as polyethylene terephthalate, polybutylene terephthalate, and copolymers thereof, polyolefin fibers such as polyethylene, polypropylene, and polystyrene, acrylic fibers such as polyacrylonitrile, acrylic fibers such as modacrylic, nylon 6, Polyamide fibers such as nylon 66 and nylon 12, polyvinyl alcohol fiber, polyvinylidene chloride fiber, polyvinyl chloride fiber, synthetic fiber such as urethane fiber, semi-synthetic fiber such as triacetate fiber and diacetate fiber, viscose rayon, copper ammonia Examples include regenerated cellulosic fibers such as rayon, polynosic rayon, and lyocell, and regenerated fibers obtained by spinning a solution of collagen, alginic acid, chitin, and the like. The polymer constituting the chemical fiber may be in the form of a homopolymer, a modified polymer, a blend, a copolymer or the like.

The softening agent applied to the thin paper contains a substance in which an alkyl chain is bonded to dextrin as described above (hereinafter also referred to as an alkyl chain-linked dextrin compound).
The type of dextrin to which the alkyl chain is bound is not particularly limited, but general ordinary dextrin, cyclodextrin, indigestible dextrin, maltodextrin, cluster dextrin having no speciality and shape characteristics such as indigestion are suitable. is there.
The alkyl chain bond dextrin compound contained in the softening agent is not necessarily one type, and alkyl chain bond dextrin compounds obtained from different types of dextrin may be mixed and contained.
Representative examples of alkyl chain-linked dextrin compounds include alkenyl succinic esterified dextrins.
Here, dextrin is a glucose polymer obtained by hydrolysis of starch, and is considered to be highly safe for the human body. Moreover, it has a hydroxyl group and is water-soluble.
An alkenyl succinic esterified dextrin has an anionic property, a cellular property, a surface activity, and an emulsifying property not found in dextrin by introducing alkenyl succinic acid while having safety of the dextrin to the human body.

Such alkenyl succinic esterified dextrins are, for example, potato starch, corn starch, waxy corn starch, sweet potato starch, wheat starch, rice starch, tapioca starch, sago starch and other natural starches, amylose and amylopectin fractions, etc. According to the above, it can be obtained by dry-baking dextrinization, or by dipping by wet acid and / or enzyme treatment and then reacting with alkenyl succinic anhydride in the presence of an alkali catalyst.
It can also be obtained by reacting the starch with alkenyl succinic anhydride and then dextrinization.
As the alkenyl succinic anhydride to be reacted with the starch, those having 6 to 22 carbon atoms, for example, octenyl succinic anhydride, dodecenyl succinic anhydride, octadecyl succinic anhydride and the like are suitable.
The degree of substitution of the alkenyl succinic acid ester (substituent DS per mole of anhydroglucose residue) is preferably 0.002 to 0.3, preferably 0.005 to 0.2. The degree of substitution is determined by neutralization titration.

The blending ratio of the substance in the softening agent is preferably 5 to 65% by mass. Preferably, it is 10-30 mass%. When the amount is less than 5% by mass, the paper surface is not sufficiently smooth, and a feeling of bulkiness is felt. On the other hand, when the amount is more than 65% by mass, the paper surface feels sticky and the desired smoothness is hardly exhibited.
On the other hand, the softener preferably further contains glycerin.
The blending ratio of glycerin is 30 to 90% by mass, preferably 65 to 80% by mass. When glycerin is blended, softness and smoothness are further improved.
For example, the amount of the softening agent applied to the thin paper having a weight of 16.5 g / m ² is 1.65 to 21.5 g / m ² , preferably 3.3 to 9.9 g / m ² . If it is less than 1.65 g / m ^2, the effect of the softener is less likely to express almost no improvement in effect beyond the 21.5 g / m ^2, also it becomes difficult to use it is not strained.
The method for applying the softening agent is not limited. A known method of applying a chemical solution to thin paper can be used. For example, it can be performed by coating with a coating machine or spray coating.

Next, evaluation tests conducted on sanitary thin paper according to the present invention and other sanitary thin paper will be described in detail below.
<Evaluation Test 1>
The effectiveness of alkyl chain-linked dextrin compounds was tested.
In the test, tissue paper (Examples 1 to 4) coated with a softener containing a substance in which alkyl chains are bonded to various dextrins in the softener (Examples 1 to 4) and tissue paper coated with a softener containing undegraded starch (comparison) Example 1), tissue paper (Comparative Example 2) coated with a softener containing a substance having an alkyl chain bonded to undegraded starch, and a softener containing a starch degradation product not containing an alkyl chain-bound dextrin compound Tissue paper (Comparative Example 3), tissue paper (Comparative Example 4) coated with a softener containing a starch-decomposed starch-free product containing an alkyl chain-bonded substance, and an alkyl chain-bonded dextrin compound (Comparative Example 4). "Moist feeling", "softness", "smoothness" of tissue paper (Comparative Examples 5 to 8) coated with softeners containing various dextrins "It was decided to sensory evaluation.
In addition, the ratio of the active ingredient in the softening agent of each example was 20 mass%, and the application quantity of the softening agent was 20 mass%. Moreover, the thin paper to apply | coat was all made into 20.0 g / m < ² > of a tsubo.
The results are shown in Table 1. In the table, ◎ indicates very felt, ○ indicates felt, × indicates not felt.

<Test results and discussion>
As shown in Table 1, Examples of the present invention coated with a softening agent containing an alkyl chain-linked dextrin compound are excellent in “moist feeling”, “softness”, and “smoothness”, while being comparative examples. The result was inferior. It can be said that the effect of the present invention is due to the alkyl chain-linked dextrin compound.

<Evaluation Test 2>
The “moist feeling”, “softness”, and “smoothness” of the sanitary thin paper according to the present invention (Examples 1 and 2) and other sanitary thin paper (Comparative Examples 1 to 3) were evaluated.
(Example 1)
8.4 g / m of softening agent containing 20% by mass of alkenyl succinic esterified dextrin and 80% by mass of glycerin based on dextrin and octenyl succinic anhydride as a raw paper with a weight of 20.0 g / m ^{2 2 was} applied as Example 1.
(Example 2)
The same thin paper as in Example 1 was coated with 4.6 g / m ^{2 of} a softening agent containing 50% by mass of alkenyl succinic esterified dextrin and 50% by mass of glycerol using dextrin and octenyl succinic anhydride as raw materials. This was designated as Example 2.
(Comparative Example 1)
The same thin paper as in Example 1 was coated with 2.7 g / m ^{2 of} a softening agent containing 80% by mass of alkenyl succinic esterified dextrin and 20% by mass of glycerol using dextrin and octenyl succinic anhydride as raw materials. This was designated as Comparative Example 1.
(Comparative Example 2)
Comparative Example 2 was obtained by applying 9.2 g / m ^{2 of} glycerin alone to thin paper.
(Comparative Example 3)
A thin paper that was not coated with glycerin was designated as Comparative Example 3.
[Evaluation methods, etc.]
The evaluation method was sensory evaluation in which samples according to each example were evaluated by touch. The evaluation is based on Comparative Example 2 having a reference value of 3 points, while other examples are relatively inferior: “Inferior: 1 point, slightly inferior: 2 points, similarly: 3 points, slightly superior: 4 points, excellent: 5 points” We decided to evaluate. The average value of 10 people was determined as the result value.

<Test results and discussion>
The result of the evaluation test 2 is shown in FIG. As shown in the figure, the difference in “moist feeling” in Examples 1-2 and Comparative Examples 1-2 is small.
Regarding “softness”, Example 1 was the most excellent in terms of highness, followed by Example 2, Comparative Example 2, and Comparative Example 1. The point difference between Examples 1 and 2 is small, while the point difference between Example 2 and Comparative Example 2 is large. The point difference between Comparative Example 2 and Comparative Example 1 is small.
As for “smoothness”, Example 1 was the best in terms of high points, followed by Example 2 and Comparative Example 2 with a point difference, followed by Comparative Example 1 with a further point difference.
From these results, “moist feeling”, “softness” and “smoothness” are improved by blending a softener with a substance in which an alkyl chain is bonded to dextrin.
In addition, the effect of “smoothness” and “softness” tends to decrease as the blending amount of the substance having an alkyl chain bonded to dextrin in the softening agent increases.
The range of the blending ratio of the substance in which the alkyl chain is bonded to the dextrin in the softening agent is about 5 to 65% by mass, and particularly about 10 to 30% by mass is effective.

<Evaluation Test 3>
The “dry paper strength”, “MMD”, “softness”, “elongation” of the sanitary thin paper according to the present invention (Example) and other sanitary thin paper (Comparative Example, Reference Example) were measured, Sensory evaluation was performed for “moist feeling”, “softness”, and “smoothness”.
The results are shown in Table 1 together with the compositions of Examples and Comparative Examples. The application amount of the softening agent is 20% by mass. The base papers were all thin paper with a weight of 20.0 g / m ² .
[Evaluation methods, etc.]
Dry paper strength: The dry tensile strength according to JIS P 8113 was measured in the longitudinal and transverse directions of the paper. The unit of numerical values in the table is cN, and the test piece is 15 mm wide × 250 mm long.
MMD: Using a friction tester with roughness (manufactured by Kato Tech Co., Ltd.), the MMD indicating the change in the average friction coefficient was measured for the touch and sensation of touching each other.
Softness: Measured based on a handle ohm method according to JIS L1096 E method.
Elongation: Using a tensile tester (Minebea Corp.), measure the length from the beginning of the longitudinal tension until it breaks, and calculate the elongation.
Subsequently, the result of the evaluation test 3 is shown in Table 2.

<Test results and discussion>
From the results of the evaluation test 3 shown in Table 2, examples of the softness, MMD, and elongation are good in all items, whereas the comparative examples are inferior in some test items. There are numerical ones. Regarding the dry paper strength, the results were higher in Examples than in Comparative Examples. In the examples, compared with the reference example in which the softening agent is not applied, the paper strength reduction due to the softening agent application is suppressed to about 10 to 20%.
The substance in which an alkyl chain is bonded to dextrin has a lower hygroscopic function than glycerin, and thus it is considered that the decrease in paper strength is suppressed.
From the results of the above tests, the examples according to the present invention are superior in “moist feeling”, “softness”, and “smoothness” as compared with the other examples, and the dry paper strength and softness required for sanitary thin papers. Ness, MMD and elongation are sufficient. In addition, it was found that the dry paper strength was also high.

  From the above evaluation tests, the sanitary thin paper of the present invention has sufficient strength to withstand wiping, is excellent in “softness”, “smoothness”, and “moist feeling”, and is also suitable for the human body and the environment. It is a sanitary thin paper with little impact.

  INDUSTRIAL APPLICABILITY The present invention can be used for tissue paper, toilet paper, kitchen paper, and sanitary thin paper used for touching the skin.

It is a graph showing the result of sensory evaluation.

Claims (2)

  A sanitary thin paper comprising a softener containing 5 to 65% by mass of a substance having an alkyl chain bonded to dextrin on the thin paper.   The sanitary thin paper according to claim 1, wherein the softening agent contains 30 to 90% by mass of glycerin.

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