JP3297035B2 - Flexible fiber web and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

FIELD OF THE INVENTION The present invention relates to a flexible fiber web which is flexible and excellent in both touch and moist feeling.
And its manufacturing method.

[0002] The fibrous web in the present invention includes a nonwoven fabric, but is preferably a cellulosic fibrous web, especially tissue paper.

[0003]

2. Description of the Related Art Household paper, such as tissue paper and toilet paper, is increasing in consumption in terms of simplicity of life and comfort. In this case, the tissue paper needs water resistance and strength as compared with the toilet paper.

[0004] Further, it has been conventionally known to use a softening agent to increase the softness and soften the feel of the tissue paper. Known softeners include surfactants, wax emulsions, reactive softeners (which react strongly with cellulose to orient aliphatic hydrocarbons regularly around fibers), and silicone-based softeners. I have.

However, since this type of softener is a chemically synthesized product, it is not always suitable for sensitive skin. On the contrary, there is a problem that paper powder tends to be easily generated and water absorbency is reduced, because the expression of flexibility is expected.

For example, JP-A-5-156596 discloses salts having hygroscopicity (sodium chloride, calcium chloride, potassium pyrophosphate, sodium metaphosphate, potassium polyphosphate, sodium polyphosphate) and hygroscopic salts. Polyhydric alcohols and sugars (glycerin, D-sorbitol, maltitol, reduced maltose starch syrup, reduced starch hydrolyzate) and water-retaining paste (sodium alginate, sodium polyacrylate, methylcellulose, propylene glycol alginate, fiber) A nonwoven fabric or paper is impregnated with a chemical solution containing sodium glycolate (CMC), calcium cellulose glycolate, sodium starch glycolate, sodium starch phosphate, casein, sodium caseinate). To have.

In this case, salts having hygroscopicity,
Polyhydric alcohols, sugars, and water-retaining pastes are all said to impart or improve hygroscopicity, flexibility, softness and the like. Further, as a means for impregnating a chemical solution, a spray method is used.

[0008]

However, in the prior art, both the smoothness (feel) and the moist feeling (wet feeling) are not sufficient.

Accordingly, a main object of the present invention is to improve smoothness (feel) and moist feeling (wet feeling).

[0010]

The flexible fibrous web of the present invention which has solved the above-mentioned problems has a temperature of 20 ° C. and a humidity of 6 ° C.
For a fibrous web material of 10 to 65 g / m ² in rice basin based on 5% RH, a surfactant and a polyhydric alcohol are contained as softeners in an amount of 0.01 to 50% based on the dry weight of the fibrous web material. The softener is not surface active
10-25% by weight of active agent, 10-25% by weight of polyhydric alcohols
%, And 70 to 50% by weight of water .

Further, another flexible fiber cloth according to the present invention is provided.
Temperature is 20 ° C, humidity is 65% RH.
With respect to the fiber web material 0~65g / m ^2, and softener
Surface active agent and polyhydric alcohol
0.01 to 50% of the dry weight of each
Wherein the softener is a secondary additive to the softener.
Is an addition amount of 1% by weight or less.
is there. Secondary additives in this latter case are, for example,
For example, sorbitol or glucose or a mixture thereof
Sugars such as compounds, flavors, colorings, preservatives, and antioxidants
It comprises at least one of the agents.

In the present invention, the surfactant is preferably an anionic surfactant, especially an alkyl phosphate salt having 8 to 20 carbon atoms. Preferably, the polyhydric alcohol comprises glycerin.

On the other hand, as a method for producing such a flexible fiber web, a transfer method or a spray method is applied to a fibrous web material having a rice area of 10 to 65 g / m ^{2 at} a temperature of 20 ° C. and a humidity of 65% RH. The present invention proposes a method in which a surfactant and a polyhydric alcohol are contained as softeners in an amount of 0.01 to 50% based on the dry weight of the fibrous web material.

Further, an anionic surfactant and a polyhydric alcohol are used as softeners in a dry weight of the fibrous web material with respect to a fibrous web material of 10 to 65 g / m ² in US basis at a temperature of 20 ° C. and a humidity of 65% RH. To produce a fibrous web having flexibility by adding 0.01 to 50% to each of the surfactants.
-25% by weight, polyhydric alcohols 10-25% by weight, water
70 to 50% by weight, or based on the softener
The present invention also proposes a method for producing a flexible fiber web, characterized in that the amount of the secondary additive is 1% by weight or less and the fiber web after the softener application is not subjected to a heat drying treatment.

<Function> The present invention is different from a water-based type such as a wet tissue in that it is housed in a paper box like a normal tissue paper, and is taken out one by one for use.

In the present invention, the fibrous web material is impregnated with a surfactant and a polyhydric alcohol as softeners in an amount of 0.01 to 50% based on the dry weight of the fibrous web material. Initially, surfactants were thought to contribute to improving smoothness, and polyhydric alcohols were thought to contribute to improving moist feeling, and were expected to work independently when used in combination. , The results of the experiment far exceeded that expectation. That is, by combining the surfactant and the polyhydric alcohol, the feeling of smoothness became stronger than when the same amount of the surfactant was used alone, and the same amount of the polyhydric alcohol was used alone. I felt more moist than before. Even with the same degree of smoothness, it is more moist (of course there is a limit)
It's easy to imagine that a smoother feel and a smoother feel at the same level of moistness (which also has a limit) will make you feel more moist.
The reason for the above-mentioned result is probably that the smooth feeling and the moist feeling act synergistically rather than destructively as feelings.

Furthermore, it is not sufficient to simply combine a surfactant and a polyhydric alcohol. When the content of the surfactant is less than 0.01% with respect to the dry weight of the web material, a smooth feeling can hardly be felt and the surface is rough.
Conversely, if it is too much, it will give a rough and even harder feeling. When the content of the polyhydric alcohol is less than 0.01% with respect to the dry weight of the web material, almost no moist feeling is felt, and when it is too large, a sticky feeling (sticky feeling) is given. become. In such a case, the feel produced by the surfactant and the feel produced by the polyhydric alcohol act synergistically or in a worse way. From this viewpoint, the contents of the surfactant and the polyhydric alcohol are each 0.01 to 50% based on the dry weight of the fibrous web material. More preferably, the total content of the surfactant and the polyhydric alcohol is 0.01 to 30%, particularly preferably 0.1 to 0.8%.

The surfactant of the present invention is preferably an anionic surfactant. When using an anionic surfactant,
There is an advantage that a smooth feeling and a moist feeling can be obtained with or without heating and drying the fibrous web to which the softener has been applied, and the skin irritation is less than that of other surfactants. Among the anionic surfactants, sulfonate-based and sulfate ester-based anionic surfactants are preferred to be alkyl phosphate ester salts since residual sulfur odor is emitted. However, even when a nonionic surfactant, a cationic surfactant or an amphoteric surfactant is used, the smooth feeling and the moist feeling due to the synergistic action can be improved.

On the other hand, when an anionic surfactant is used as described above, a softening effect appears even when the fiber web after the softening agent is applied is heated and dried.
By omitting the heating and drying process for the fiber web after the softener is applied, it is possible to prevent the dryer from being stained (the fiber web is stained by the heating and drying treatment in the dryer), and the operation stability of the manufacturing apparatus is improved. In addition, since it is not necessary to perform heat drying after the softener application, the softener application can be performed in any process from manufacturing to packaging,
Process design becomes easy.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. First, the agent used will be described. As the surfactant in the present invention, carboxylate-based anionic surfactant, sulfonate-based anionic surfactant, sulfate ester-based anionic surfactant, phosphate ester Anionic surfactants such as salt-based anionic surfactants (especially alkyl phosphate esters); sorbitan fatty acid esters, diethylene glycol monostearate, diethylene glycol monooleate, glyceryl monostearate, glyceryl monostearate, propylene glycol monostearate Mono-fatty acid esters such as N- (3-oleoxy-2-hydroxypropyl) diethanolamine, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbit beeswax, polyoxyethylene sorbitan Kisuteareto, polyoxyethylene monooleate, polyoxyethylene sorbitan sesquistearate, polyoxyethylene glyceryl monooleate, polyoxyethylene monostearate,
Nonionic surfactants such as polyoxyethylene monolaurate, polyoxyethylene monooleate, polyoxyethylene cetyl ether, polyoxyethylene lauryl ether; cationic surfactants such as quaternary ammonium salts, amine salts or amines Zwitterionic surfactants such as aliphatic derivatives of secondary or tertiary amines containing carboxy, sulfonate, sulfate, or aliphatic derivatives of heterocyclic secondary or tertiary amines; However, as described above, anionic surfactants, and particularly, anionic surfactant alkyl phosphate salts are preferable.

Examples of polyhydric alcohols include glycerin, propylene glycol and mixtures thereof, and glycerin is particularly preferred.

It is preferable to use water as a solvent in addition to the surfactant and the polyhydric alcohol.

If necessary, known agents can be added to the softener of the present invention as secondary additives (small components). Examples of this include sugars such as sorbitol or glucose or mixtures thereof, flavors, colorings,
Secondary additives such as preservatives and antioxidants can be added at a ratio of 1% or less.

In the present invention, a softener containing at least a surfactant and a polyhydric alcohol among the above-mentioned agents is prepared, and this is added to, for example, a tissue paper material.
Impregnate. A suitable compounding ratio is 15
-25% by weight, 15-25% by weight of a polyhydric alcohol, and 70-50% by weight of water. If the ratio is out of this range, stability with time is poor and separation is liable to occur. The target tissue paper material is temperature 20 ℃, humidity 65% R
It is 10 to 65 g / m ² in U.S. meter on H standard. More preferably, it is 10 to ²⁰ g / m ² . If the rice basis weight is low,
Problems such as loss of stiffness and breakage occur. Conversely, if the rice basis weight is excessively high, the flexibility becomes poor.

Such a tissue paper material can be produced by a conventional method, but is preferably made of 100% pulp. In this case, the ratio of NBKP: LBKP is 50:50 to 100: 0, particularly 85:15 to 9
3: 7 is desirable. The higher the proportion of NBKP, the softer the feel. Of course, creping is performed after wet papermaking. The crepe rate in this case is preferably 15 to 25%, particularly preferably 17 to 23%.

The tissue paper material is impregnated with a surfactant and a polyhydric alcohol in an amount of 0.01 to 50% based on the dry weight of the web material. A suitable impregnation amount is 0.1 to 30 based on the total weight of the surfactant and the polyhydric alcohol based on the dry weight of the web material.
%, Particularly preferably 0.1 to 0.8%.

As for the mode of impregnation, as described in the official gazette of the first prior art, spray application is possible. However, as shown in FIG. Since the amount of application of the chemical solution from the central part is large and the peripheral part is small, even if wrapped, it is difficult to control the wrapped part, wrinkles occur in the wrapped part, and Overall variation cannot be fundamentally avoided.

In this respect, a transfer printing method in which the tissue paper material 1 is circulated around the impression cylinder 3 and the chemical solution 5 contained in the vat 4 and imparting a wet feeling is picked up and applied to the tissue paper material 1, It is preferable to adopt a flexographic transfer printing method.

FIG. 2 shows a gravure transfer printing system, in which a chemical solution is transferred to an anilox roll (engraving roll) 6 and scraped and uniformized by a doctor blade 7. It can be applied to the passing tissue paper material 1. However, in this case, in order to adjust the coating amount, the scraping amount by the doctor blade 7 is extremely small, and it is necessary to change to another anilox roll 6 having a different mark, and time for changing the roll is required. It becomes. Moreover, many anilox rolls 6
It is uneconomical to prepare

For this reason, the flexographic transfer printing system shown in FIG. 3 is optimal. That is, the paper is picked up by a squeezing roll 8 made of a rubber roll or a metal roll, transferred to an anilox roll 6, transferred to a plate cylinder 9, and applied to the tissue paper material 1. In the flexographic transfer printing method, the amount of coating can be easily and finely controlled by adjusting the gap between the squeezing roll 8 and the anilox roll 6. Further, the application amount can be controlled by changing the plate cylinder 9. Changing the plate cylinder 9 can be done quickly and easily.

On the other hand, FIG. 4 shows another form of the spray system, in which the softener is sprayed from the spray device 11 onto the tissue paper material 1 fed from the supply reel 10, and then the take-up reel 12 It is configured to be wound up.

[0032]

EXAMPLES The effects of the present invention will be clarified by the following examples. Thin paper was made with a round paper machine and dried with a dryer to obtain a dry tissue. A liquid in which various softeners were dissolved in water was spray-applied to the tissue to obtain a tissue paper (Examples 1 and 2) according to the present invention. Further, using the tissue papers according to Examples 1 and 2, various characteristics before and after heating and drying were evaluated. In addition, a tissue without a softener was used as a comparative example.

The evaluation results of each example are shown together with the softener content.
It is shown in Table 1. In addition, in Table 1, the sensory evaluation was evaluated on a three-point scale:…: very good,…: good, △: normal, after the tester confirmed the smoothness and moist feeling by touch.

[0034]

[Table 1] As is clear from Table 1, Examples 1 and 2 according to the present invention had very good smoothness and moist feeling as compared with Comparative Examples. In addition, when a cationic surfactant is used, a sufficient softening effect does not appear unless heat treatment is performed. However, when an alkyl phosphate potassium salt (anionic surfactant) is used, heat treatment is not performed. Sufficient softening effect was exhibited with or without the presence.

[0035]

As described above, according to the present invention, smoothness (feel) and moist feeling (wet feeling) can be remarkably improved.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of impregnation by spray application of a softener.

FIG. 2 is a schematic diagram showing an example of impregnation of a softener by a gravure transfer printing method.

FIG. 3 is a schematic view showing an example of impregnation of a softener by flexographic transfer printing.

FIG. 4 is a schematic diagram showing an example of impregnation of a softener by a spray method.

[Explanation of symbols]

1: tissue paper material, 3: impression cylinder, 5: chemical solution, 6
... anilox roll, 8 ... squeezing roll, 9 ... plate cylinder, 1
0: supply reel, 11: spray device, 12: take-up reel.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-10-226986 (JP, A) JP-A-7-216786 (JP, A) JP-A-7-82662 (JP, A) JP-A 62-86 223375 (JP, A) JP-A-62-223098 (JP, A) JP-A-9-195167 (JP, A) JP-A-48-54300 (JP, A) (58) Fields investigated (Int. ⁷ , DB name) D21H 11/00-27/42 D06M 13/00-13/535 A47K 7/00

Claims (8)

(57) [Claims] 1. A surfactant and a polyhydric alcohol as a softening agent are added to a dry weight of a fibrous web material for a fibrous web material having a rice area of 10 to 65 g / m ^{2 at} a temperature of 20 ° C. and a humidity of 65% RH. 0.01 to 50% each
The softener comprises 10 to 25% by weight of a surfactant and a polyvalent alcohol.
10. A flexible fibrous web comprising 10 to 25% by weight of water and 70 to 50% by weight of water . 2. At a temperature of 20 ° C. and a humidity of 65% RH.
With respect to the fiber web material basis weight 10~65g / m ^2, flexible
Surfactants and polyhydric alcohols
Each containing 0.01 to 50% of the dry weight of the material
In other words, the softener has a single additive additive to the softener.
It has the flexibility of being added amount of less than
Fiber web. 3. The method according to claim 2, wherein the secondary additive is sorbitol or
Sugars such as glucose or a mixture thereof, flavors,
At least one of colorants, preservatives, and antioxidants
The flexible material according to claim 2, which is made of a seed.
Fiber web. 4. A fiber web having flexibility according to any one of claims 1 to 3, wherein the surface active agent comprises an anionic surfactant. 5. The method according to claim 1, wherein the anionic surfactant has 8 to 20 carbon atoms.
5. The flexible fibrous web according to claim 4, comprising an alkyl phosphate salt of the above. 6. The fibrous web according to claim 1 , wherein the polyhydric alcohol comprises glycerin. 7. A surfactant and a polyhydric alcohol are used as a softening agent by a transfer method or a spray method on a fibrous web material of 10 to 65 g / m ² in rice basis at a temperature of 20 ° C. and a humidity of 65% RH. Rutotomoni contained 0.01 to 50%, respectively, relative to the dry weight of the fibrous web material, the softening agent 10 to 25 wt% surfactant, polyhydric alcohol
10-25% by weight of water, 70-50% by weight of water,
Alternatively, the additive is not more than 1% by weight based on the softener.
A method for producing a flexible fibrous web, characterized by the following addition amount . 8. An anionic surfactant and a polyhydric alcohol are used as softeners in a dry weight of a fibrous web material, based on a fibrous web material of 10 to 65 g / m ² in U.S.A. 0.01 to
50% by weight , wherein the softener comprises 10 to 25% by weight of a surfactant, a polyvalent alcohol.
10-25% by weight of water, 70-50% by weight of water,
Alternatively, the additive is not more than 1% by weight based on the softener.
A method for producing a flexible fiber web , wherein the amount of addition is as follows, and the heat-drying treatment is not performed on the fiber web after the softener is applied.