JP2012030125A - Method for producing household sanitary tissue - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a household sanitary tissue exhibiting improved target texture (softness), moisture-holding properties and the like, with a reduced amount of medical fluid applied thereto, by the inhibition of the elongation of sheet thereof, the reduction of the basis weight thereof, and a decrease of stiffness thereof.SOLUTION: In an interfolder, when raw paper prepared from a pulp fiber is wound by winding rolls 1, 2 with prescribed width and continuous sheets 10, 20 are rewound from the winding rolls respectively, and then, folded and piled by a folding and piling means 50, prior to the folding and piling, medical fluid is continuously applied onto the target sheets by roll transfer by means of roll transfer devices 33, 34 and 43, 44 for applying the medical fluid onto the target sheets.

Description

  The present invention relates to a method for producing household sanitary thin paper such as dry type tissue paper.

  Recently, a high-quality tissue paper (called a dry-type tissue paper for a wet type), which is soft to the touch by containing a so-called lotion chemical, is commercially available, It is popular because it makes it difficult for the skin to tingle even when the nose is repeatedly pinched, or the nose does not turn red easily.

The present applicant has made several proposals for further improved household sanitary thin paper (Patent Document 1 and Patent Document 2).
For example, in Patent Documents 1 and 2, a chemical solution containing a softening agent and a humectant is contained in a base paper at 46 mg / cm ³ or more.

  Spray application can be employed for applying a so-called lotion chemical, but it is difficult to obtain a sufficient application amount. Moreover, in order to obtain a coating amount as much as possible, it is necessary to apply the chemical solution off-line before applying to the interfolder after ply processing.

  However, when an off-line method for applying a chemical solution is employed, since the sheet is stretched by a chemical solution application at a winding stage before being applied to an interfolder, it is necessary to increase the rice paper weight of the base paper. Sheet elongation also occurs in off-line roll coating.

Increasing the base weight of the base paper not only causes a cost increase with an increase in the amount of pulp used, but also increases the stiffness of the paper, impairs flexibility and uses softeners to avoid this. Fall into a vicious circle.
JP 2001-164385 A JP 2003-164386 A

  Therefore, the object of the present invention is to prevent the sheet from being stretched, to reduce the weight of the paper, and to reduce the stiffness of the paper, thereby reducing the amount of chemical solution applied and improving the desired touch (texture). Another object of the present invention is to provide a household sanitary thin paper exhibiting characteristics such as moisturizing properties and a method for producing a home sanitary thin paper from which the home sanitary thin paper can be obtained.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
In the inter folder, in the manufacturing method of household sanitary thin paper, each continuous sheet is rewound from a winding roll obtained by winding a base paper made of pulp fiber with a predetermined width, and these are folded and stacked to produce a product.
For the base paper in the paper making process, as an active ingredient, at least one of wet paper strength agent, softener and carboxymethylcellulose is added in advance as an additive,
A roll by a gravure roll by adjusting a pH of a moisturizing chemical solution different from the additive as an active ingredient to 5.0 to 6.0 as an active ingredient between unwinding and folding stacking steps in the interfolder A method for producing a sanitary thin paper for home use, characterized in that the chemical solution is continuously applied by transfer and then impregnated with the chemical solution by a pressing device so that the chemical solution content per sheet unit volume is 12 to 45 mg / cm ^3. .
<Invention of Claim 2>
The ratio of at least one of wet paper strength agent, softener and carboxymethyl cellulose in the active ingredient is 3.0 to 4.5% by weight,
The manufacturing method of the household sanitary thin paper of Claim 1 which makes the ratio of the chemical | medical solution in an active ingredient 95.5 to 97.0 weight%.

(Function and effect)
In the interfolder, a so-called lotion chemical solution is continuously applied to a continuous sheet by roll transfer between unwinding and folding and stacking processes. When the chemical solution is applied by roll transfer, the amount of the chemical solution applied to the base paper can be increased as compared with the case of spray coating. In addition, since the online application is performed in the interfolder, the paper does not stretch, the basis weight of the paper can be lowered, the paper is less stiff or has an excellent texture, Even with a small amount of chemical solution applied, a product with high flexibility can be obtained. Lowering the rice tsubo and reducing the amount of the chemical solution applied means better economy.
Moreover, by performing roll transfer application of the chemical solution with a gravure roll, the amount of the chemical solution applied can be increased as compared to a roll without unevenness.
The lotion chemical solution of the present invention is mainly intended to increase the touch (texture), increase the moisture retention, relieve the stimulation of the pulp fiber skin, or increase the moisturizing feeling.

In the paper making process of the base paper, other types of additives other than the above-described chemical solution of the present invention, for example, a softening agent comprising a surfactant, a wet paper strength agent such as starch or dextrin, or one or more of carboxymethyl cellulose are added. Then, the texture can be improved in combination with the target drug solution of the present invention. On the other hand, it can be assumed that all liquids are applied on-line in the interfolder, but there is a tendency for paper strength to drop at once. Is preferably added first.
As an additive, it is desirable to use at least one of a wet paper strength agent, a softening agent, and carboxymethyl cellulose. This is because wet paper strength and softeners are cationic, whereas carboxymethyl cellulose is anionic. As a result, when the cationic wet paper strength agent and softening agent are adsorbed to the anionic pulp fiber, the anionic carboxymethyl cellulose becomes an adsorption medium, which is reliably adsorbed on the fiber, and the wet paper strength. The functions inherent to the agent and softener can be exhibited. Moreover, carboxymethylcellulose itself functions to improve the dry paper strength.

<Invention of Household Sanitary Thin Paper Manufactured by the Present Invention>
The basis weight per ply of the base paper is 10 to 25 g / m ² , the content per unit volume of the chemical solution is 12 to 45 mg / cm ³ , and the humidity is adjusted under the conditions specified in JIS P8111 in the product. The moisture content measured by JIS P8127 is 10.0-20.0%, the softness in the product is 0.5-1.0 g, and the oil KES touch index in the product is 6.5 or less,
80 to 100% by weight of the active ingredient, and 95.5 to 97.0% by weight of the chemical solution as the active ingredient, and at least one of a wet paper strength agent, a softening agent and carboxymethylcellulose is 3.0 to 4. A liquid containing 5% by weight is added to the base paper.
A sanitary thin paper for household use.

(Function and effect)
Although the content of the chemical solution per sheet unit volume is as small as 12 to 45 mg / cm ³ , the base weight of the base paper (per ply) is as low as 10 to 25 g / m ^2. Since (rigidity) is small, it has excellent flexibility and texture. And since the moisture content is high, it gives a moist feeling. In addition, the present invention can obtain a low softness. Furthermore, according to the present invention, it is possible to obtain an excellent texture and touch.
As an additive, it is desirable to use at least one of a wet paper strength agent, a softening agent, and carboxymethyl cellulose. This is because wet paper strength and softeners are cationic, whereas carboxymethyl cellulose is anionic. As a result, when the cationic wet paper strength agent and softening agent are adsorbed to the anionic pulp fiber, the anionic carboxymethyl cellulose becomes an adsorption medium, which is reliably adsorbed on the fiber, and the wet paper strength. The functions inherent to the agent and softener can be exhibited. Moreover, carboxymethylcellulose itself functions to improve the dry paper strength.

  According to the present invention, the elongation of the sheet is prevented, the rice paper weight is reduced, and the paper stiffness is small, so that the desired touch (texture), moisture retention, etc. are achieved while reducing the amount of chemical solution applied. It is possible to obtain a household sanitary thin paper exhibiting these characteristics.

Hereinafter, the present invention will be described in more detail while showing the best mode for carrying out the present invention.
The present invention provides household sanitary thin paper such as dry-type tissue paper. Therefore, the moisture content is less than 100%, usually 80% or less, and depends on the humidity in the factory at the factory shipment stage. However, at the time of use (takeout stage), the moisture content almost corresponds to the atmospheric humidity. It is what you have. The preferred moisture content is 10 to 20%, particularly 10 to 15% (measured according to JIS P8111 and measured by JIS P8127) when stored in an ordinary paper household sanitary thin paper container and unopened. Moisture content).

<Manufacturing form>
First, the manufacturing method according to the present invention will be described.
In the production of the box-type tissue paper, after making thin paper from pulp fibers (preferably 100% virgin pulp fiber not containing waste paper pulp) in a paper machine, crepe if necessary, calendering, This is wound up to produce a primary raw roll (generally referred to as a jumbo roll), and although not shown, this primary raw roll is set in a known ply machine, and is delivered from a plurality of primary raw rolls. The continuous sheet is overlapped and wound, and is cut into a plurality of pieces (divided into a plurality in the width direction) to produce a secondary raw roll made of a plurality of plies.

  The secondary web roll produced by the ply machine is taken out from the ply machine and then set in the interfolder shown in FIG. In the inter folder, the secondary continuous sheets fed out from the secondary material roll are stacked while being folded. The folded laminate manufactured by the interfolder is cut at a predetermined interval in the longitudinal direction in the subsequent equipment, and becomes a product through processing such as boxing and packaging.

FIG. 1 shows a process in an interfolder according to the present invention.
That is, in the inter folder, the winding roll 1 as the above-mentioned secondary raw roll obtained by winding a base paper made of pulp fibers with a predetermined width (usually a product width or a multiple of the width). 2, the continuous sheets 10 and 20 are rewound, and are folded and stacked by the folding and stacking means 50.

  The set of interfolders shown in the figure has a large number in the direction penetrating the drawing, and the final folded laminate is cut at intervals equal to the product width in the longitudinal direction in the subsequent equipment, and subjected to processing such as boxing and packaging. It is manufactured.

  Now, the two-ply continuous sheets 10 and 20 from the take-up rolls 1 and 2 are subjected to tension control by the tension controllers 31 and 41, and then have a narrow embossing roll between this and the elastic roll. Ply bonding is performed by ply bonding means 32 and 42 that nip the sheet in a pressed state. Thereafter, a chemical liquid pan is provided, the chemical liquid is picked up by a gravure roll, and the chemical liquid is continuously applied by roll transfer by roll transfer devices 33, 34, 43, and 44 that transfer the chemical liquid to a target sheet. Here, the two-ply continuous sheets 10 and 20 are provided with the two roll transfer devices 33 and 34 and the roll transfer devices 43 and 44, respectively. This is because a chemical solution is applied to the skin.

  After applying the chemical solution in this way, it is desirable to incorporate a step of impregnating the chemical solution with the press devices 35 and 45. By using the press devices 35 and 45, not only can the chemical solution be impregnated, but also the amount of impregnation in the width direction can be made uniform.

  Thereafter, the continuous sheets 10 and 20 are folded and stacked by the folding and stacking means 50 as described above.

  Here, ply bonding will be described. In this type of tissue paper, the plies (thin paper layers) are joined to each other by embossing so that they do not leave in use. For this reason, in the equipment provided with the ply machine and the interfolder individually, conventionally, the embossing is performed by the embossing roll between the primary continuous sheets in the ply machine and the winding. Since the processing speed of the ply machine is faster than that of the interfolder, if emboss bonding is applied here, embossing cannot be uniformly applied and ply separation is likely to occur, or paper tearing or breakage at the embossing portion may occur. There is a problem that it tends to occur and ply bonding (overlap bonding) becomes unstable.

  Therefore, as disclosed in JP-A-2002-347146, the present applicant supplies a plurality of continuous sheets each composed of a plurality of plies that are not joined by embossing to an interfolder, Prior to folding and stacking, it is desirable to emboss the continuous sheet to join the plies together.

  In this case, as shown in FIG. 1, it is desirable to arrange the ply joining means 32 and 42 in front of the roll transfer devices 33, 34 and 43, 44. If the reverse is true, the chemical solution is applied to the entire surface of the sheet, and the bonding strength decreases when ply bonding is performed on both sides of the sheet width.

  Here, in the base paper making process, another kind of chemical solution other than the target chemical solution of the present invention, for example, a softening agent comprising a surfactant, a wet paper strength agent such as starch or dextrin, or one or more of carboxymethyl cellulose is applied. Then, the texture can be improved in combination with the target drug solution of the present invention.

<Chemicals>
In applying the so-called lotion chemical solution, it is desirable that the content per sheet unit volume showing a moisture content of about 6% after paper making is 12 to 45 mg / cm ³ , particularly 18 to 40 mg / cm ³ . If the chemical content is low, it is difficult to obtain the following target characteristics. Increasing the chemical solution content not only increases the cost as the chemical solution is used, but also gives a feeling of stickiness during use and a residual feeling of the chemical solution after use. In the present invention, in spite of a small amount of the chemical solution used, the following characteristics are largely related to lowering the rice paper weight.

That is, the desirable rice basis weight per ply of the base paper of the present invention is 10 to 25 g / m ² , particularly preferably 10 to 15 g / m ² . Since the rice tsubo is low, the stiffness of the paper can be weakened, and it becomes sufficiently flexible. However, if it is too low, the strength will decrease.

  The softness of the product is preferably 0.5 to 1.0 g, particularly 0.6 to 0.8.

  Although it is not limited to the lotion chemical | medical solution in this invention, it mainly focuses on improving the touch (texture), moisturizing property, reducing the irritation | stimulation to the skin of a pulp fiber, or raising a moist feeling. Things can be mentioned.

Examples of moisturizing chemicals include polysiloxanes such as silicone oil and silicone powder, polyhydric alcohols such as glycerin, diglycerin, propylene glycol, 1,3-butylene glycol, and polyethylene glycol, sorbitol, glucose, xylitol, maltose, and maltitol. And saccharides such as mannitol and trehalose, glycol solvents, and derivatives containing at least one moisturizing agent among derivatives thereof.
Furthermore, higher alcohols such as cetanol, stearyl alcohol and oleyl alcohol, liquid paraffin and the like can be used.

In addition, in the chemical solution, amino acids such as glycine, aspartic acid, arginine, alanine, cystine, cysteine; Plant extract: olive oil, jojoba oil, rosehip oil, almond oil, eucalyptus oil, avocado oil, camellia oil, soybean oil, safflower oil, sesame oil, evening primrose oil, etc .; vitamins, hydrolyzed collagen, hydrolyzed keratin, Hydrolyzed silk, chitosan, urea, honey, royal jelly, sodium hyaluronate, ceramide, squalane, petrolatum and the like can be blended.
Here, there are vitamin C, vitamin E, and collagen. This type has a moisturizing function. Vitamin C and vitamin E also function as antioxidants. Vitamin E is a component with a strong reducing power and has an antioxidative action that eliminates active oxygen and free radicals and prevents the generation of lipid peroxide. Therefore, vitamin E functions as a chemical liquid stabilizer, and when applied to the skin of a person who uses thin paper, the effect of preventing the sebum of the skin and promoting blood circulation are exhibited. There is also a moisturizing function. Vitamin C, like vitamin E, has sebum antioxidant activity. Vitamin C has the action of reducing vitamin E, so if both vitamin C and E are used, vitamin C works as an auxiliary to vitamin E, reducing vitamin E oxidized by active oxygen, etc. The effect of maintaining the strong anti-oxidant effect of sebum is exhibited. Collagen forms 90% of the dermis of the skin, and when this decreases, the skin loses moisture and tension. Therefore, by making it contain in thin paper, while exhibiting the moisturizing effect which moisturizes skin when this contacts with skin, the moisturizing effect is exhibited also to thin paper.

  Furthermore, as a chemical solution, when the pH is set to be weakly acidic with a pH of 5.0 to 6.0, the skin does not become alkaline even when brought into contact with the skin, and the skin is rough due to the influence of the chemical solution pH. Can be effectively prevented. A particularly preferred pH range is 5.3 to 5.7. The pH can be adjusted by adding an acidic or basic pH adjuster to the chemical solution. When the chemical solution is strongly acidic, an aqueous sodium hydroxide solution or an aqueous potassium hydroxide solution can be used. In the case of neutral / alkaline, citric acid, malic acid and lactic acid can be used.

  Examples of the chemical solution for obtaining a refreshing sensation include sorbitol, altitol, xylitol, erythritol, lactitol, and palatinit. Particularly preferred are erythritol, xylitol and sorbitol, and more preferred is erythritol or xylitol. Furthermore, one or two or more kinds of cooling sensitizers selected from the group of menthol, salicylic acid, α-cinerol, and derivatives thereof can be included. In this case, it is desirable that the agent for obtaining the refreshing feeling is contained unevenly on the surface of the paper base material in a state dispersed in the binder component.

  On the other hand, additives desirable to be added in the papermaking stage include wet paper strength agents, softeners and carboxymethylcellulose.

  A typical example of a softener is a surfactant-based softener, and examples of the softener include anionic surfactants, nonionic surfactants, cationic surfactants, and zwitterionic surfactants. It can be appropriately selected and used. When an anionic surfactant is used, the stiffness (bending rigidity) of the base paper can be reduced to the above-described range, and thus the moisturizing feeling by the moisturizing agent and the soft feeling by the softening agent can be promoted. As the anionic surfactant, carboxylate, sulfonate, sulfate ester, phosphate ester, and the like can be used. An alkyl phosphate ester salt is particularly preferable.

  Examples of nonionic surfactants include sorbitan fatty acid esters, diethylene glycol monostearate, diethylene glycol monooleate, glyceryl monostearate, glyceryl monooleate, and polyhydric alcohol monofatty acid esters such as N- (3- Oleiroshiki-2-hydroxypropyl) diethanolamine, polyoxyethylene hydrogenated castor oil, polyoxyethylene sorbitan beeswax, polyoxyethylene sorbitan sesquistearate, polyoxyethylene monooleate, polyoxyethylene monolaurate, polyoxyethylene cetyl ether Polyoxyethylene lauryl ether can be used.

  As the softener of the present invention, it is desirable to use a cationic surfactant. As the cationic surfactant, a quaternary ammonium salt, an amine salt, an amine, or the like can be used. In addition, as the zwitterionic surfactant, an aliphatic derivative of a secondary or tertiary amine containing carboxy, sulfonate, sulfate, an aliphatic derivative of a heterocyclic secondary or tertiary amine, or the like is used. be able to.

  As the wet strength (enhancement) agent, in addition to the melamine-formaldehyde addition condensate and the urea-formaldehyde addition condensate, the following can be preferably used in consideration of the environment. Polyacrylamide, polyvinyl alcohol, glyoxal / polyacrylamide copolymer, polyamide epichlorohydrin resin whose number of functional groups is reduced to 1/10 of the usual number, dialdehyde starch or cation-modified starch, oxidized starch, etc. More specifically, it has a cationic property. Thermosetting resins comprising a polyvinylamide copolymer and a divalent aldehyde (for example, Japanese Patent Publication No. 44-26670, Japanese Patent Publication No. 54-44762, Japanese Patent Publication No. 57-149595), cationic aldehyde-modified polyacrylamide A copolymer (JP-A-6-184985, JP-A-8-56868), a cationic polymer and an anionic polymer, wherein at least one polymer of the cationic polymer and the anionic polymer is Hydrophobic (JP 2002-2002 75787 JP) or the like, it can be used known ones.

<Additive formulation>
A preferred additive formulation of the present invention is shown below.
Active ingredient 60-100% by weight (especially 80-100% by weight)
Chemical solution 95.5-97.0% by weight
At least one kind of softener, wet paper strength agent and CMC 3.0 to 4.5% by weight
・ Moisture 0-40% by weight

<Manufacturing conditions>
In the production of the sanitary thin paper of the present invention, the raw pulp and papermaking conditions are adjusted so that the range of 10-25 g / m ² per ply is optimal and 10-15 g / m ² is optimal in the paper making process. To do. As a raw material pulp, waste paper pulp can be included at a ratio of 50% or less as necessary, but is preferably virgin pulp, and is composed of NBKP and LBKP, and the ratio of NBKP is 30 to 70%, particularly 40 to 40%. 60% is desirable. Then, it is desirable to add a wet paper strength agent, a softening agent, and carboxymethyl cellulose (CMC) to make paper.

  At this time, the beating width of the raw pulp can be narrowed to increase the density. In general, when the density is increased by specifying the rice tsubo, the paper strength increases and the paper thickness decreases and the soft feeling does not appear.However, in the subsequent creping process, the crepe blade angle is adjusted to increase the crepe rate. If you increase it, you will feel soft.

  Finally, in the calendar processing step, the calendar processing is performed by adjusting the pressure in each calendar processing of the online machine calendar and the ply machine calendar so that the paper thickness does not fall excessively and falls outside the range of the target paper thickness.

  That is, when the above production method is adopted, a raw paper having a thin paper thickness and a high surface smoothness is formed by narrowing the beating width of the raw pulp and increasing the density, and the raw paper is creped at a high crepe rate. As a result, a fluffy feeling is developed while having smoothness, and the final paper thickness is adjusted in the subsequent calendar processing. In addition, what is necessary is just to adjust suitably with the specific crepe rate, the manufacturing equipment to be used, an additive, and the mixture ratio of raw material pulp.

As described above, the two-ply product of 10 to 25 g / m ² is desirable as the rice basis weight per ply of the household sanitary thin paper of the present invention.

<Oil KES touch index>
The oil KES touch index is preferably 6.5 or less.
For this measurement, as shown in FIGS. 2 to 4, an artificial leather (supplera: Idemitsu Techno Fine Co., Ltd.) is placed on the base of a friction tester “KES SE” manufactured by Kato Tech Co., Ltd. The measuring terminal T is covered with artificial leather (supplera: manufactured by Idemitsu Techno Fine Co., Ltd.), and olive oil is applied to the measuring surface of the measuring terminal covered with artificial leather (contact plane). (BOSCO extra virgin oil: NISSIN SEIMITSU OIL) 4 mg can be uniformly applied, and the measurement can be performed in the same manner as the MMD measurement procedure. Specifically, the contact plane made of artificial leather is composed of a piano wire with a cross-sectional diameter of 0.5 mm, adjacent to a unit bulging portion with a radius of curvature of 0.25 mm at the tip, and a total width of 10 mm. An MMD measurement terminal having a continuous measurement surface and a measurement surface of approximately 10 mm square with a measurement surface length of 10 mm can be formed by covering with the artificial leather. The covering of the terminal with the artificial leather is carried out by covering the terminal with the artificial leather so that a contact plane of 10 mm square is formed or so that the artificial leather is in close contact with the measurement surface of the terminal or with a slight tension. Can be achieved. When fixing the artificial leather to the terminal, make sure to fix the artificial leather so that the artificial leather and the internal terminal do not move and the contact plane is distorted during measurement, that is, when the paper sample is moved. is important. For example, after the terminal is covered so that the contact plane is formed, a portion that does not form the contact plane is firmly fixed to a portion that does not affect the measurement of the apparatus with a rubber band or the like, for example, a support material of the terminal. . Also, artificial leather is laid on the base of the MMD testing machine and fixed with adhesive tape or the like. At this time, it is important to firmly fix the artificial leather to the base so as not to be distorted during measurement. The artificial leather laid on the base is the same as the artificial leather constituting the contact plane. In addition, the paper sample is cut into a 10 cm square and used, and is fixed to a base on which artificial leather is laid. At the time of measurement, a sample pressing weight (about 100 g) is pressed on a paper sample. In addition, the load on the measuring terminal of the testing machine is set to 50 g, and the entire contact plane made of artificial leather is brought into contact with the paper sample with a contact pressure of 50 gf / cm ^2. This is similar to the MMD measurement. This can be achieved by attaching a disk-shaped weight to the top of the terminal. Of course, the method of fixing one end of the support material (the end opposite to the moving direction of the paper sample) conforms to the MMD measurement. The measurement is performed three times in the vertical direction of the paper sample and three times in the horizontal direction, for a total of 6 times, and the measured value is the average of the 6 times.

A pulp containing 60% NBKP and 40% LBKP is beaten to a freeness of about 600 ml (CSF), and the base paper is 14.0 g / m ² , crepe rate ((peripheral speed of the dryer during papermaking)-(reel peripheral speed)) / The base paper for sanitary paper having a (peripheral speed of the dryer at the time of paper making) × 100) of 21% was made and processed into a sanitary thin paper for home use (two stacked, 211 mm long, 231.5 mm wide).
In this case, each characteristic was investigated by changing the coating form of the rice tsubo and the chemical solution. The results are shown in Table 1.

  Example 1 is an example of the manufacturing method shown in FIG. Conventional example 1 is an example in which the present applicant experimented in the proposing process of Japanese Patent Laid-Open No. 2003-164385. That is, the above-described chemical solution is roll-coated offline before being applied to the interfolder. Comparative Examples 1 to 3 are currently commercially available products, and the descriptions in the column of the chemical solution application method are based on expectations.

The measurement conditions are as follows.
(1) Measurement of US tsubo (1 ply): JIS P 8214
(2) Measurement of paper thickness (2-ply): The paper thickness is measured using an Ozaki Dial Thickness Gauge “PEACOCK G type” under the conditions of JIS P8111. Specifically, confirm that there is no dust, dust, etc. between the plunger and the measuring table, lower the plunger on the measuring table, move the memory of the dial thickness gauge to adjust the zero point, and then Then, raise the plunger and place the sample (tissue paper) on the test table, slowly lower the plunger and read the gauge at that time. At this time, only the plunger is placed. In addition, a measurement is performed by 1 sheet and it is set as the average value of 10 times.
(3) Chemical solution content: About 10 g of sample is extracted with a Soxhlet extractor by heating for 4 hours to keep the extract lightly boiling on a warm bath with 120-140 ml of ethanol / benzene solvent (volume ratio 1: 1). . Thereafter, the sample is left in a constant temperature dryer at 150 ± 2 ° C. for 90 minutes, the weight of the extract is measured, and the ratio is determined by dividing by the dry weight of the sample.
(4) Chemical solution content per unit volume of paper: Chemical solution content = US tsubo (per ply) x 2 (ply) x chemical solution content (%) x 1000 ÷ (volume per unit area)
However, the volume per unit area is paper thickness (μm) ÷ 10000 × 100 × 100.
(5) Moisture content: supra
(6) Softness: Handle ohmmeter
(7) Oil KES feel index: supra
(8) MMD: Surface property testing machine (“Friction Tester KESSE” manufactured by Kato Tech).

  In the first embodiment, in the interfolder, a so-called lotion chemical solution is continuously applied to a continuous sheet by roll transfer between unwinding and folding and stacking steps. As can be seen from the results in Table 1, when the chemical solution is applied by roll transfer, the amount of the chemical solution applied to the base paper can be increased as compared with the case of spray coating. In addition, since the online application is performed in the interfolder, the paper does not stretch, the basis weight of the paper can be lowered, the paper is less stiff or has an excellent texture, Even with a small amount of chemical solution applied, a product with high flexibility can be obtained. Lowering the rice tsubo and reducing the amount of the chemical solution applied means better economy.

It is a schematic diagram of the manufacture form of the household sanitary thin paper of this invention. It is a figure which shows the measurement terminal of the oil KES touch index, and the outline at the time of a measurement. It is a figure which shows the outline of the example of the measuring apparatus of surface characteristics. It is a figure for demonstrating the structure of the contact plane.

  DESCRIPTION OF SYMBOLS 2 ... Winding roll, 10, 20 ... Continuous sheet, 50 ... Folding and stacking means, 32, 42 ... Ply joining means, 33, 34, 43, 44 ... Roll transfer device, 35, 45 ... Press device.

Claims (2)

In the inter folder, in the manufacturing method of household sanitary thin paper, each continuous sheet is rewound from a winding roll obtained by winding a base paper made of pulp fiber with a predetermined width, and these are folded and stacked to produce a product.
For the base paper in the paper making process, as an active ingredient, at least one of wet paper strength agent, softener and carboxymethylcellulose is added in advance as an additive,
A roll by a gravure roll by adjusting a pH of a moisturizing chemical solution different from the additive as an active ingredient to 5.0 to 6.0 as an active ingredient between unwinding and folding stacking steps in the interfolder A method for producing a sanitary thin paper for home use, characterized in that the chemical solution is continuously applied by transfer and then impregnated with the chemical solution by a pressing device so that the chemical solution content per sheet unit volume is 12 to 45 mg / cm ^3. . The ratio of at least one of wet paper strength agent, softener and carboxymethyl cellulose in the active ingredient is 3.0 to 4.5% by weight,
The manufacturing method of the household sanitary thin paper of Claim 1 which makes the ratio of the chemical | medical solution in an active ingredient 95.5 to 97.0 weight%.

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