JP6068787B2 - Tissue paper manufacturing method - Google Patents

Description

The present invention relates to a process for the production of tissue paper which aqueous lotion chemical has been applied.

  Some tissue papers are coated with chemicals to provide moisture retention and flexibility. In order to relieve mental stress caused by rhinitis or nasal congestion, this type of tissue paper may be mixed with microcapsules containing a fragrance that gives a refreshing sensation in the chemical solution. Microcapsulation prevents the perfume from transpiration at all times, destroys the outer shell of the microcapsule due to friction during nose biting, etc., and exhibits the effect of the internal perfume.

However, when granting microencapsulated perfumes this kind of tissue paper, the microcapsule during processing corrupted Reya easier, yield is poor.

  In addition, even when microencapsulated, the outer shape of the microcapsule deteriorates with time, and the fragrance evaporates, and the desired effect of the fragrance may not be obtained when the product is opened or used.

Japanese Patent No. 3615534 JP 2005-237745 A JP 2008-200124 A

  Therefore, the main problem of the present invention is to improve the durability at the time of processing of the microcapsules and the deterioration with time after application in the tissue paper to which the chemical liquid containing the microcapsules containing the fragrance / coolant is applied. .

  The present invention that has solved the above problems is as follows.

[Invention of Claim 1 ]
A method for producing tissue paper to which a water-based lotion chemical solution containing a microcapsule containing a fragrance is applied,
A microcapsule having an average particle size of 6 to 30 μm, wherein the fragrance is a menthol-based fragrance containing 1.0% by weight or less of a cooling agent and 1-menthol, the outer shell is urea resin, and the fragrance content is 15 to 55% by weight. The chemical solution is dispersed in a chemical solution containing water and a polyol, and the chemical solution is 10 to 35 by a flexographic printing method using a printing plate having 10 to 30 lines and an area ratio of 10 to 20% with respect to the tissue paper base paper. A method for producing tissue paper, wherein the tissue paper is applied in the range of% by weight.

[Invention of Claim 2]
The method for producing tissue paper according to claim 1, wherein 1 to 10% by weight of microcapsules is added to the chemical solution.

[Invention of Claim 3 ]
The method for producing tissue paper according to claim 1 or 2 , wherein the microcapsules used are those subjected to seasoning for 72 hours or more under conditions of an ambient temperature of 40 to 80 ° C and an ambient pressure of 1 to 30 atmospheres .

(Function and effect)
The cause of aging degradation of microcapsules is due to the hydroxyl group that is the base of the moisturizing properties of aqueous lotion (humidity retention) chemicals. In addition, the deterioration resistance of microcapsules with time is improved. In the present invention, l-menthol is used as a fragrance, but urea resin has a high polymerization density, and even with a highly volatile component such as l-menthol, transpiration over time can be sufficiently prevented.

  Moreover, the average particle diameter of the microcapsules was set to 6 to 30 μm. By setting the average particle size, a sufficient outer film thickness can be secured and the strength can be improved.

  Further, in the present invention, flexographic printing is used as the chemical solution application method, so that a sufficient amount of moisture retention can be applied to the tissue paper base sheet without damaging the microcapsules.

  On the other hand, this invention uses the fragrance | flavor with a high effect which gives a refreshing feeling containing 1-menthol and a cooling agent. Therefore, it is easier to feel the refreshing and refreshing feeling of the fragrance, and a tissue paper having a higher mental stress mitigating effect than conventional products can be obtained.

  In addition, when the fragrance is microencapsulated and applied to the tissue paper base, by taking the prescribed conditions described in the claims, a product due to variations in microcapsule transfer amount in addition to the problem of early fragrance removal due to deterioration over time Occurrence of defects such as variation in fragrance intensity between lots is also prevented.

  The urea resin of the present invention is meant to include not only those made of 100% urea resin, but also those whose main constituent components / effect components are urea resins.

  According to the present invention as described above, tissue paper having improved durability at the time of processing of microcapsules and deterioration with time after application is provided.

The tissue paper according to the present invention and the manufacturing method thereof will be described in detail below.
The present invention is obtained by applying a water-based lotion chemical solution in which microcapsules containing a fragrance are dispersed on tissue paper, and the tissue paper includes a moisturizing component that is an active ingredient of the chemical solution and the above microcapsules. .

  The tissue paper base paper can be manufactured according to a known method for manufacturing tissue paper base paper.

However, it is desirable that the tissue paper base sheet according to the present invention is a two-ply laminate of crepe paper having a basis weight of 10 to 18 g / m ² according to JIS P 8124. The paper thickness (measured with a Peacock manufactured by Ozaki Seisakusho) is 80 to 250 μm, preferably 100 to 200 μm, more preferably 130 to 180 μm. The longitudinal direction of the dry tensile strength (hereinafter also referred to as dry paper strength) specified in JIS P 8113 is 200 to 700 cN / 25 mm, preferably 250 to 600 cN / 25 mm, particularly preferably 300 to 600 cN / 25 mm with 2 plies. On the other hand, the transverse direction is set to 100 to 300 cN / 25 mm, preferably 130 to 270 cN / 25 mm, particularly preferably 150 to 250 cN / 25 mm with 2 plies. If the dry tensile strength is too low, troubles such as paper breakage and elongation at the time of production and use are likely to occur, and if it is too high, the touch becomes stiff during use.

  The raw material of the tissue paper base paper according to the present invention may be any known raw material, but the pulp raw material is preferably composed of NBKP and LBKP. Waste paper pulp may be blended as appropriate, but it should be composed only of NBKP and LBKP of virgin pulp because it is compatible with aqueous lotion chemicals and desirable in terms of the texture of the resulting tissue paper. . In this case, the blending ratio (JIS P 8120) is preferably NBKP: LBKP = 20: 80 to 80:20, and particularly preferably NBKP: LBKP = 40: 60 to 70:30.

  On the other hand, the chemical solution can be applied to the tissue paper base paper by providing a printing device in a ply machine that draws a continuous sheet from a plurality of raw rolls manufactured by a known printing equipment or paper making equipment to form a laminated sheet. .

  In the present invention, a flexographic printing method is used as a printing method for applying the chemical solution. As the chemical solution coating method, a gravure printing method and a spray coating method are known. However, in the gravure printing method, an operation of scraping the printing plate with a doctor blade is necessary, and there is a risk of damaging the microcapsules. Further, in the spray method, the liquid temperature is lowered by the heat of vaporization at the time of spraying, so that the outer shell of the microcapsule is hardened or increased in viscosity, and clogging may occur. In the present invention, in combination with the configuration of the microcapsules described later, the above problem is avoided by limiting to flexographic printing. Furthermore, in flexographic printing, since the printing pressure is low using a resin printing plate, an excessive load is not applied to the microcapsules and the microcapsules are not damaged. Also. Since the chemical liquid can be applied while being kept at a constant liquid temperature in the chemical liquid tank, there is an advantage that it can be applied uniformly.

  Here, in the present invention, the flexographic printing method is adopted. As the condition, the number of lines of the printing plate is 5 to 40 lines and the area ratio is 5 to 30% in relation to the configuration with the microcapsules described later. More preferably, the number of lines of the printing plate is 10 to 30 lines and the area ratio is 10 to 20%.

Moreover, it is desirable to apply the chemical solution to both sides of the tissue paper base. And the application quantity of the chemical | medical solution in this invention shall be the range of 10 to 35 weight% of the tissue paper base paper weight (US tsubo). Therefore, the chemical solution coating amount is preferably 1.0 to 5.25 g / m ² per side. In addition, when it is less than 10% by weight, the effect of the moisturizing agent and the effect of the microcapsule are hardly exhibited. Application exceeding 35% by weight is difficult in terms of operation, and the content of microcapsules becomes too high, which increases the possibility of excessive fragrance.

  Here, the chemical solution according to the present invention is an aqueous lotion chemical solution in which microcapsules containing a fragrance are dispersed. The chemical solution for dispersing the microcapsules above contains water and a polyol. In particular, those containing 70 to 90% of polyol and 1 to 15% of water, particularly preferably containing 0.01 to 22% of functional chemicals. Such an aqueous chemical solution has an action of extending the crepe of the tissue paper base paper, and improves the smoothness of the surface of the tissue paper as well as moisture retention.

  The polyol includes polyhydric alcohols such as glycerin, diglycerin, propylene glycol, 1,3-butylene glycol, polyethylene glycol, and derivatives thereof, and saccharides such as sorbitol, glucose, xylitol, maltose, maltitol, mannitol, and trehalose. .

  Functional agents include softeners, surfactants, inorganic and organic fine particle powders, oily components, and the like. Softeners and surfactants have the effect of imparting flexibility to the tissue and smoothing the surface, and anionic surfactants, cationic surfactants and zwitterionic surfactants are applied. Inorganic and organic fine particle powders have a smooth surface. The oil component has a function of improving lubricity, and higher alcohols such as liquid paraffin, cetanol, stearyl alcohol, and oleyl alcohol can be used.

  In addition, as a functional agent, one or more of a hydrophilic polymer gelling agent, collagen, hydrolyzed collagen, hydrolyzed keratin, hydrolyzed silk, hyaluronic acid or a salt thereof, ceramide, etc. are optionally selected as agents that maintain the moisture retention of polyol. A moisturizer such as a combination of the above can be added.

  In addition, emollients such as fragrances and various natural extracts, vitamins, emulsifiers that stabilize compounding ingredients, antifoaming agents, antifungal agents, organic acids, etc., that suppress the foaming of chemicals and stabilize application as functional agents. can do. Furthermore, you may contain the antioxidant of vitamin C and vitamin E.

  Among the above components, when the main component is a polyhydric alcohol such as glycerin or propylene glycol, it is preferable from the viewpoint of application in terms of stabilizing the viscosity and application amount of the chemical solution.

  On the other hand, the addition amount (blending amount) of the microcapsules in the chemical solution is 1 to 10% by weight. If it is less than 1% by weight, it is difficult to exert the effect of the fragrance. If it exceeds 10% by weight, the scent is too strong, and there is a high possibility that the user's mental stress relieving effect due to the fragrance and cooling effect cannot be obtained.

  On the other hand, the microcapsules dispersed in the chemical solution have an average particle size of 6 to 30 μm in the present invention. More preferably, the thickness is 10 to 20 μm. If it is out of the above range, there is a risk that breakage due to load or leakage of fragrance due to cracks may occur when chemicals are applied under the above flexographic printing conditions, and it becomes difficult to stabilize the transfer amount.

  On the other hand, in the present invention, a menthol-based fragrance containing 1.0% by weight or less of a cooling agent and l-menthol is used as a fragrance included in the microcapsule. This fragrance gives the skin an excellent cooling sensation due to the menthol volatility and the cooling agent when biting the nose, and gives a refreshing impression due to the unique odor of menthol. In addition, even if it contains content of a cooling agent exceeding 1.0 weight%, the improvement of an effect is not hoped for, but there exists a possibility that it may become high on the contrary.

  The perfume content in the microcapsules is preferably 15 to 55% by weight. With such a fragrance content, a stable microcapsule can be obtained. Moreover, the effect at the time of a nose bite by a fragrance | flavor is fully exhibited.

  Here, a known cooling agent other than 1-menthol can be used as the cooling agent, but a preferable one is a dicarboxylic acid ester compound having a molecular weight of 250 or more and 600 or less and a ClogP of 3.0 or more. l-Menthol is highly volatile and easy to evaporate from inside the microcapsule. However, the above-described cooling agent has excellent sustainability and little evaporation from the inside of the microcapsule over time. Therefore, by using the above-mentioned cooling agent, there is little decrease in the effect over time compared to only 1-menthol. ClogP is a water / octanol partition coefficient.

（式中、ＡはＣＨ₂またはＣＨ＝ＣＨを表し、ｎはＡがＣＨ₂の場合、０〜４の整数を、ＡがＣＨ＝ＣＨの場合１を表し、Ｂは置換基を有してもよい、パラメンタン骨格を含有する炭素数１０〜１８のアルコール残基であり、Ｃは置換基を有していてもよい炭素数６〜１８のアルコール残基を表す。） In particular, as the cooling agent, a particularly preferable one among the dicarboxylic acid ester compounds is represented by the following general formula (1).

(In the formula, A represents CH ₂ or CH═CH, n represents an integer of 0 to 4 when A is CH ₂ , 1 represents A when A is CH═CH, and B has a substituent. It is an alcohol residue having 10 to 18 carbon atoms containing a paramentane skeleton, and C represents an alcohol residue having 6 to 18 carbon atoms which may have a substituent.)

  On the other hand, the microcapsules according to the present invention are limited to those having a urea resin outer shell. Various resins forming the outer shell of the microcapsule are known, but those of the well-known urethane resin are not desirable in the present invention because the chemical solution contains water and glycerin, and thus easily deteriorates by these hydroxyl groups. In addition, the well-known melamine resin is stable without degradation due to such hydroxyl groups, but it is hard and the outer shell is difficult to break during use, and it does not break moderately due to friction with the skin at the nose bite, Difficult to release fragrance.

  In this invention, the problem which the outline of the above-mentioned urethane resin and melamine resin has is avoided by employ | adopting the outline of the said urea resin. Furthermore, the urea resin has a density (specific gravity) of 1.4 to 1.5, compared with the melamine resin (1.3 to 1.4) and the urethane resin (1.1 to 1.2). The density is high, and the effect of preventing perfume transpiration over time is obtained. In the present invention, a fragrance having a high stress relieving effect is included by synergy of highly volatile l-menthol and a cooling agent typified by a dicarboxylic acid ester compound. In particular, the volatility of l-menthol is effective. Therefore, the refreshing effect is highly sustained.

  Here, in the present invention, a urea resin-based outer shell is adopted, but it is particularly preferable that the seasoning is performed under conditions of an ambient temperature of 40 to 80 ° C. and an ambient pressure of 1 to 30 atm after the capsule formation for at least 72 hours or more. Use what you did. Immediately after the manufacture, the outer shell of the microcapsule may not be stable due to the transpiration pressure of the encapsulated fragrance, the contained moisture, etc., but by performing seasoning for 72 hours or more, the outer shell of the microcapsule becomes stable. Durability during flexographic printing is improved.

[Test example]
The microcapsules according to the present invention (Test Example 1) and the microcapsules different from the present invention (Test Example 2 and Test Example 3) were tested for deterioration over time.
Paper is manufactured by manufacturing microcapsules according to each example in which a fragrance containing l-menthol and a cooling agent is encapsulated, dispersed in a chemical solution containing water and glycerin as a moisturizing component, and applied to tissue paper Was used. All application was done by flexographic printing.
The test was a method in which each sample was used after being exposed for 4 weeks in an environment of a temperature of 50 ° C. and a humidity of 60%, and the strength of the refreshing feeling at that time was evaluated in five stages of sensory evaluation.
Evaluation is 5: There is a strong refreshing feeling. 4: There is a refreshing feeling, 3: There is a refreshing feeling, 2: The feeling of cooling is not felt so much, 1: The feeling of cooling is hardly felt.
The results and the composition according to each example are shown in Table 1 below.

  As can be seen from Table 1, in the present invention, a refreshing feeling due to the fragrance was sufficiently felt, but in the other Test Examples 2 and 3, the refreshing feeling was hardly felt. From this result, it was found that tissue paper having a high refreshing feeling can be obtained by adopting the configuration of the present invention.

Claims (3)

A method for producing tissue paper to which a water-based lotion chemical solution containing a microcapsule containing a fragrance is applied,
A microcapsule having an average particle size of 6 to 30 μm, wherein the fragrance is a menthol-based fragrance containing 1.0% by weight or less of a cooling agent and 1-menthol, the outer shell is urea resin, and the fragrance content is 15 to 55% by weight. The chemical solution is dispersed in a chemical solution containing water and a polyol, and the chemical solution is 10 to 35 by a flexographic printing method using a printing plate having 10 to 30 lines and an area ratio of 10 to 20% with respect to the tissue paper base paper. A method for producing tissue paper, wherein the tissue paper is applied in the range of% by weight. The method for producing tissue paper according to claim 1, wherein 1 to 10% by weight of microcapsules is added to the chemical solution.   The method for producing tissue paper according to claim 1 or 2, wherein the microcapsules used are those subjected to seasoning for 72 hours or more under conditions of an ambient temperature of 40 to 80 ° C and an ambient pressure of 1 to 30 atmospheres.