JP6366675B2 - Manufacturing method of sanitary paper - Google Patents

Description

  The present invention relates to a method for manufacturing sanitary paper in which surface properties and flexibility are improved by applying a softening agent or a moisturizing agent to sanitary paper such as tissue paper or toilet paper.

In order to improve the flexibility of tissue paper and toilet paper, as a technology for softening fibers with chemicals, softwood kraft pulp and hardwood kraft pulp with a certain range of fiber length and fiber roughness are blended in a specific range, A technique for obtaining a bulky and flexible crepe paper by adding a softener internally to a paper material and further forming a wet paper by further adding a dispersant such as polyethylene oxide and then performing a crepe treatment is disclosed. (Patent Document 1).
In addition, as a technique to improve flexibility by applying chemicals (external addition) to the surface of tissue paper or toilet paper webs by spraying, etc., it is possible to apply cationic compounds and nonionic surface activity to sheets on Yankee dryers or press parts. A technique for providing a self-emulsifying flexible composition comprising an agent, an organic acid or an inorganic acid, and an organic solvent is disclosed (Patent Document 2).
Furthermore, a technique for applying a chemical component composed of a softening agent or a moisturizing agent by spraying or printing in tissue paper folding processing equipment is disclosed (Patent Documents 3 and 4).

JP 2006-097191 A JP 2008-223161 A JP 2004-218151 A JP 2007-61143 A

By the way, when a water-soluble texture improver containing a flexible component and a moisturizing component is directly applied to the web with a paper machine (on-line coating with a paper machine), it is a process compared to the case where it is applied in the secondary process after the web formation. Simplification, and the cost improvement effect related to the equipment and manufacturing is great. However, when a water-soluble texture improving agent is applied to a web with a paper machine, there is a problem that liquid sag and poor appearance tend to occur.
Accordingly, an object of the present invention is to provide a method for producing sanitary paper that is less likely to cause dripping or poor appearance when a water-soluble texture-improving agent is applied online to a web with a paper machine.

In order to solve the above problems, the sanitary paper manufacturing method of the present invention comprises a texture improving agent containing a water-soluble softening agent and / or a water-soluble humectant on the surface of a base paper for tissue paper, and a dry fiber weight for the base paper. A method for producing sanitary paper to be applied at a ratio of 10 to 14.3 wt%, wherein at least one side of the base paper between the reels winding the base paper from the outlet of a Yankee dryer in the base paper making process, A plurality of orifices having a diameter of 0.5 to 2.0 mm, which are spaced apart from each other at intervals of 3.2 to 10 mm in a direction perpendicular to the winding direction, are brought into contact with each other, and the texture improving agent is supplied from the orifice to the axial length of the orifice. 720 to 1900 ml / min per meter , a back-up plate or a backup plate on the back side of the web facing the orifice and where the texture- improving agent is applied. The orifice is opened at a predetermined position of the header, and at least the outer surface of the header where the orifice is opened has an arc shape, the base paper is in contact with the arc-shaped surface, and the axial direction of the header When viewed, the center angle θ of the arc from the most upstream position of the base paper in contact with the arc-shaped surface to the most downstream position is 30 to 90 °, and the orifice is upstream of θ / 2. Located on the downstream side of the orifice, the base paper is supported by a diffusion plate and brought into contact with the arcuate surface.

The water-soluble softener comprises at least one selected from the group consisting of a surfactant containing an aliphatic group having 8 to 24 carbon atoms, a water-soluble organopolysiloxane, and a water-soluble derivative of the water-soluble organopolysiloxane, The water-soluble humectant is preferably composed of at least one selected from the group consisting of polyhydric alcohols, saccharides, and amino acid compounds.
It is preferable that the base paper is pressed by a support roll on the upstream side of the orifice so as to contact the arcuate surface.

  According to the present invention, when a water-soluble texture improving agent is applied online to a web with a paper machine, liquid dripping and poor appearance are unlikely to occur, and the water-based texture improving agent is applied in the secondary process after the web formation. Can be omitted.

It is a figure which shows an example of the paper machine which manufactures the sanitary paper based on embodiment of this invention. It is a perspective view which shows the structure of a header and an orifice. It is a figure which shows the contact state of the base paper to the header outer surface when it sees from the axial direction of a header. It is a perspective view which shows the structure of a support roll and a diffusion plate. It is a figure which shows the state in which a water-soluble moisturizing component is applied to the base paper surface from an orifice.

The present invention will be described below with reference to the preferred embodiments of the present invention with reference to the drawings, but these are given for illustrative purposes and do not limit the present invention.
With reference to FIG. 1, the manufacturing method of the sanitary paper based on embodiment of this invention is demonstrated. First, a papermaking raw material is supplied from a raw material tank 1 for storing the papermaking raw material, and further diluted with white water to prepare a paper stock. After the degassing screening dust removal, this paper is sent to the stock inlet 3 by the fan pump 2. Stock Inlet 3 is a uniform, floc-free (small lump) across the wire width of the paper machine, and a well-dispersed fiber so that no flow streaks occur on the wire at the proper concentration, speed, and angle. Supply. As the stock inlet 3, there are a head box, a pressurization type, a hydraulic type, etc. installed at a high place in an open atmosphere, and any of them may be adopted.
Then, the stock is jet-discharged between the wire 4 and the felt 5 from the stock inlet 3 to form a sheet (web, wet paper, equivalent to “base paper” in claims) 100 on the felt 5. In addition, although FIG. 1 illustrates a crescent former, the wet paper web can be formed by any of a round net type, a long net type (Ford Linear) type, a suction breast type, a short net type, and a twin wire type. good.

The web 100 formed between the wire 4 and the felt 5 is closely transferred to the Yankee dryer 8 by the pressure roll 7. Next, the web 100 is dried by the Yankee dryer 8 and the Yankee dryer hood 9, further peeled off from the Yankee dryer 8 while being creped by the creping doctor 11, and wound around the reel 14 via the reel drum 13. The Yankee dryer 8 is a drum made of cast iron or cast steel for drying the web, and the outer diameter is generally 2.4 to 6 m.
Here, creping is a method in which a paper is mechanically compressed in the longitudinal direction (machine traveling direction) to form a wavy wrinkle called crepe, and the bulk (feeling of bulk), softness, water absorption on sanitary paper. Properties, surface smoothness, aesthetics (crepe shape) and the like. A crepe is formed by the creping doctor 11 due to the speed difference between the Yankee dryer 8 and the reel 14 (the reel speed is slower than the Yankee dryer). Although the characteristics of the crepe depend on the speed difference, if the basis weight of the base paper on the Yankee dryer 8 is 7 to 40 g / m ² , the basis weight on the reel 14 is approximately 9 to 50 g / m ² , The basis weight on the Yankee dryer 8 becomes larger.

The crepe rate based on the speed difference between the Yankee dryer 8 and the reel 14 is defined by the following equation.
Crepe rate (%) = 100 x (Yankee dryer speed (m / min)-reel speed (m / min)) ÷ reel speed (m / min)
The quality of the crepe and the operability of the creping are substantially determined by the crepe rate, and in the present invention, the crepe rate is preferably in the range of 10 to 50%.

Further, it is preferable to use the Yankee spray 10 for optimally performing the creping process. By applying a predetermined adhesive from the Yankee spray to the surface of the dryer 8 or the web 100, the web adheres to the Yankee dryer 8, and the creping doctor 11 can perform the creping treatment as described above.
As a component of the adhesive, polyamide polyamine resin (PA resin), polyamide amine epichlorohydrin (PAE resin), cationic polyamide resin, polyvinyl alcohol (PVA), polyamide plasticizer addition, which is representative of Herculis Kleptrol 190 Product, polyamide softener addition product, modified polyamidoamine, polyvinyl acetate and the like, and these can be used alone or in combination.
Further, as a release agent for improving the peeling of the web 100 from the Yankee dryer 8, paraffinic mineral oil, naphthenic mineral oil, vegetable oil, animal oil, higher fatty acid, hydrocarbon compound, nonionic surfactant, ethylene glycol, propylene glycol, diethylene glycol Glycerol, polyethylene glycol, esterified product of polyethylene glycol oil, silicone compound, dipropylene glycol, triethanolamine, polyoxyethylene fatty acid ester and the like can be used alone or in admixture of two or more.
In order to obtain an optimum creping treatment, the concentration of the adhesive and / or release agent can be adjusted as appropriate and sprayed onto the surface of the Yankee dryer 8.

A cylindrical header 60 is disposed between the outlet of the Yankee dryer 8 and the reel 14, and a large number of orifices 61 shown in FIG. Then, the orifice 61 is brought into contact with at least one surface of the web 100, and the texture improving agent is discharged from the orifice 61 to apply a texture improving agent containing a water-soluble softening agent and / or a water-soluble humectant to the surface of the web 100.
The position where the texture improving agent is applied to the base paper is preferably immediately before the reel drum 13 for winding the sanitary paper, and the header 60 (orifice 61) may be disposed at this position. In addition, by providing a backup plate or a backup roll on the back side of the web where the texture improving agent is applied, it is possible to capture the texture improvement agent and recover the texture improving agent.
Reference numeral 17 in FIG. 1 denotes a machine calendar.

As shown in FIG. 2, the header 60 is installed with the direction (CD direction) perpendicular to the winding direction (MD direction) of the web 100 as the axial direction, and a plurality of orifices 61 are formed on the outer surface of the header 60 along the CD direction. (Circular outflow ports) are opened at intervals d. Note that the distance d is the distance between the edges of the adjacent orifices 61 and not the distance between the centers of the adjacent orifices 61.
A plurality of liquid supply pipes 63 extend on the opposite side of the orifice 61 of the header 60, and the water-soluble moisturizing component and the flexible component are supplied from the supply pipe 63 into the header 60 so that the flow rate is uniform in the longitudinal direction of the header 60. The water-soluble moisturizing component and the flexible component are discharged from the orifice 61 while being supplied. When the web 100 is wound while continuously contacting the orifice 61, the water-soluble moisturizing component and the soft component are applied in a streak pattern from the orifice 61 to the surface of the web 100.
In the header 60, the flow rate distribution in the longitudinal direction is generated by the inflow of the chemical solution from the supply pipe 63, and this may cause variations in the discharge amount from the orifice 61. In order to alleviate this, the inner diameter of the header 60 is preferably 20 to 45 mm, and more preferably 35 to 45 mm. Further, the orifice 61 is not limited to a circular shape, and may be an ellipse or the like.
The header 60 may not be a complete cylinder, and may be a semi-cylindrical shape as long as the outer surface of the header 60 at least where the orifice 61 is open has an arc shape.
Moreover, although intensity | strength influences a little, you may emboss after coating. In that case, the emboss is clear and the molding is good.

  The diameter of the orifice 61 is 0.5 to 2.0 mm, and the distance d between the orifices 61 is 3.2 to 10 mm. The diameter of the orifice 61 is preferably 0.8 to 1.5 mm, and the interval between the orifices 61 is preferably 3.2 to 8.5 mm. If the distance d is less than 3.2 mm, the area of the non-coated portion is narrowed during coating, and therefore the strength of the base paper decreases at a high speed of 400 m / min. When d exceeds 10 mm, the discharge amount from each orifice 61 increases to ensure a constant coating amount, boundary unevenness (striped pattern) with the non-coated portion increases, and shrinkage unevenness of the web 100 ( Wrinkles) are likely to occur, and the amount of paper dust generated due to rubbing of the non-coated portion increases. If the diameter of the orifice 61 is less than 0.5 mm, the orifice is likely to be clogged, and if it is larger than 2.0 mm, the discharge amount tends to vary. If the orifice 61 is not circular, the same circle diameter as that area is used.

FIG. 3 is a diagram illustrating a contact state of the web 100 to the outer surface of the header 60 when viewed from the axial direction of the header 60. If the most upstream position of the web 100 in contact with the outer surface of the header 60 is P and the most downstream position is Q, the central angle θ of the arc formed by the outer surface of the header 60 from P to Q is 30 to 90 °. And it is preferable that the orifice 61 is located upstream of θ / 2 (position T in FIG. 3). Here, the center angle θ is ∠POQ (O is the center of the header 60).
Thereby, the contact time of the chemical | medical solution discharged from the orifice 61 and the web 100 increases, and the familiarity of the chemical | medical solution to the web 100 becomes good.

FIG. 4 is a perspective view showing the configuration of the support roll 70 and the diffusion (Diffuse) plate 71 disposed in the vicinity of the header 60.
The surface opposite to the coating surface of the web 100 may be brought close to the outer surface of the header 60 in the vicinity of the orifice 61 with the support roll 70 on the upstream side of the orifice 61 so that the surface of the web 100 is in close contact with the orifice 61 (header 60). When the support roll 70 is provided, the contact time between the chemical liquid discharged from the orifice 61 and the web 100 can be further prolonged, and liquid dripping can be prevented. Further, the web 100 is formed by the diffusion plate 71 on the downstream side of the orifice 61. It is advisable to support the coated surface. When the diffusion plate 71 is provided, the diffusion of the chemical solution of the web 100 on the diffusion plate 71 is promoted, and the familiarity of the chemical solution to the web 100 is further improved.
The length of the diffusion plate 71 along the traveling direction of the web 100 is preferably 40 to 80 mm. If this length is shorter than 40 mm, the effect of the chemical solution to the web 100 described above is small, and if it is larger than 80 mm, the web 100 may be rubbed by contact and paper dust may be generated.

  Further, since the web 100 is brought into contact with the header 60 and is slid, paper dust may be generated from the web 100 and deposited around the orifice 61. However, the web 100 may be removed by air purge or lubricated coating treatment on the surface of the header 60. Can be dealt with. Further, if the header 60 having the orifice 61 is slid with respect to the web 100 with an amplitude of 5 to 20 mm in the CD direction, paper dust accumulation around the orifice 61 can be effectively prevented. Note that the coating liquid discharged from the orifice 61 onto the web 100 is not a straight streak, but a wavy line having an amplitude in the CD direction. However, the discharged coating liquid diffuses uniformly over the entire surface of the web 100. The streaks disappear. The header 60 can be slid, for example, by installing an air cylinder 80 and a solenoid valve type switching valve 90 beside the header 60 as shown in FIG.

FIG. 5 shows a state where the water-soluble moisturizing component and the soft component are applied from the orifice 61 to the surface of the web 100. Immediately after coating (FIG. 5 (a)), the coating portion 4a is formed in a streak shape along the MD direction at an interval d corresponding to the orifice 61, and the space between adjacent coating portions 4a becomes the non-coating portion 4b. It has become. That is, the coating part 4a continues in the MD direction but does not continue in the CD direction. And since the intensity | strength of the web 100 falls in order to contain a water-soluble moisturizing component and a flexible component in the coating part 4a, since the MD direction is higher than the CD direction, the coating part 4a is arranged along the MD direction. By providing, it becomes difficult for the web 100 to be cut, and stable production can be performed. In addition, unlike the case of coating by pattern printing, the bulk does not decrease significantly in the printing area.
Then, after a while after coating (FIG. 5 (b)), the water-soluble moisturizing component and the flexible component having high affinity with the paper (cellulose) fiber of the web 100 penetrate in the CD direction of the web 100 and are not coated. It flows into the part 4b, and after 1 to 5 minutes have elapsed, the water-soluble moisturizing component and the soft component penetrate into the entire surface of the web 100, and the streak (stripe) pattern disappears. In this way, a sanitary paper having a water-soluble moisturizing component and a soft component coated on the entire surface can be produced.

<Base paper>
A base paper for tissue paper or toilet paper is manufactured by making a paper-making raw material containing pulp. As the pulp, for example, virgin pulp such as softwood pulp or hardwood pulp, or used paper pulp regenerated from used paper can be used. Since these pulps greatly affect the quality of sanitary paper, they are appropriately blended in predetermined types and blending ratios according to the required quality. Various chemicals may be added (internally added) to the papermaking raw material for the required quality and stable operation. These chemicals include softeners, bulking agents, dyes, dispersants, wet paper strength enhancers, and drying agents. Examples thereof include paper strength agents, drainage improvers, pitch control agents, yield improvers, and the like.
The base paper can have a basis weight of 7 to 40 g / m ² , for example.

  In addition, when a texture improving agent described later is applied using toilet paper as a base paper, the absorption of moisture at the time of applying the texture improving agent may cause a decrease in paper strength, causing trouble such as running out of paper, and the operability may deteriorate. This is because normal toilet paper does not contain a wet paper strength enhancer, or when the coating amount of the texture improving agent (the amount of liquid containing water) exceeds 5 to 6 wt%, troubles such as paper breakage become prominent. . Therefore, when toilet paper is used as the base paper, and the amount of the texture improving agent applied exceeds 6 wt% of the dry fiber weight of the base paper as a liquid containing water, the texture improving agent is applied to the base paper and moistened. For a temporary period (ie, for a few seconds from when the texture-improving agent is applied to the web winding process), maintain the wet strength of the base paper and use it after using it as sanitary paper (under a large amount of water such as a flush toilet). ), A temporary wet paper strength enhancer is internally added to the toilet paper so that the wet strength is lost after a certain period of time, so that the texture improver can be stably added up to 10 wt% as a liquid amount.

  Specifically, the base paper for toilet paper is JIS P8113 according to JIS P8113, the tensile strength at the time of drying with a strip-shaped test piece having a width of 25 mm and a gripping interval of 100 mm, and the central part between both grip parts of the test piece And the tensile strength when the entire region in the width direction of the test piece is wetted along the long side of the strip and the strength immediately after wetting is 10% of the strength before wetting. A temporary wet paper strength enhancer is added so that the strength when 60 seconds have passed after wetting is 20% or more lower than the strength immediately after wetting. Examples of the temporary wet paper strength enhancer include polyacrylamide, polyamide / epichlorohydrin, glyoxal / polyacrylamide copolymer, dialdehyde starch or cationically modified starch. The higher the strength of the base paper for toilet paper by adding a temporary wet paper strength enhancer, the better, but if the strength is too high, it will take time to decrease the strength, and the water solubility required for toilet paper will be impaired. It is necessary that the wet strength is lost to some extent (20% or more) 60 seconds after wetting and is easily disaggregated.

<Feel improver>
The texture improving agent contains a water-soluble softening agent and / or a water-soluble humectant and is water-soluble. When the amount of the texture improving agent added to the base paper is a liquid containing water, when the base paper is tissue paper, the dry fiber weight ratio is 2 to 15 wt%, and preferably 2 to 10 wt%. On the other hand, when the base paper is toilet paper, the dry fiber weight ratio is 2 to 10 wt%. When the base paper is tissue paper, if the added amount of the texture improving agent to the base paper is less than 2 wt% in terms of dry fiber weight ratio, the effect of improving the texture of the base paper does not occur. The improver is wasted. Further, when the addition amount of the texture improving agent to the base paper exceeds 15 wt% in terms of the dry fiber weight ratio as a liquid amount, the strength of the web is reduced due to the aqueous component of the texture improving agent and the hydration action of the pulp in the base paper, Wrinkles tend to enter and cause paper breaks. Further, when the base paper is toilet paper, even when the temporary wet paper strength enhancer is internally added to the toilet paper, the paper break occurs when it exceeds 10 wt%.

The water-soluble softening agent comprises at least one selected from the group consisting of a surfactant containing an aliphatic group having 8 to 24 carbon atoms, a water-soluble organopolysiloxane, and a water-soluble derivative of the water-soluble organopolysiloxane. Surfactants containing an aliphatic group having 8 to 24 carbon atoms include cationic surfactants, nonionic surfactants, anionic surfactants, and amphoteric surfactants, but cationic surfactants or nonions Surfactants are easily available. Examples of the cationic surfactant include aliphatic ammonium salts such as aliphatic quaternary ammonium salts and aliphatic primary alkylamine salts, and alkylamine salts. Nonionic surfactants include sorbitan fatty acid esters, diethylene glycol monostearate, diethylene glycol monooleate, glyceryl monostearate, glyceryl monooleate, and the like.
In addition, when a nonionic (nonionic) surfactant having a low HLB containing an aliphatic group having 8 to 24 carbon atoms is used as a water-soluble softener, it is used in combination with a cationic surfactant or a high HLB ( 12 or more) By using in combination with a nonionic surfactant, self-emulsifying property can be imparted to a nonionic surfactant having a low HLB (10 or less) and water-solubilized.
Examples of the water-soluble organopolysiloxane include a polyoxyethylene / methylpolysiloxane copolymer which is a polyether-modified silicone and an aminoethylaminopropylmethylsiloxane / dimethylsiloxane copolymer which is an emulsified amino-modified silicone.
The water-soluble softening agent gives “smoothness” and “soft feeling”. Therefore, when the texture improving agent includes a water-soluble softening agent and does not include a water-soluble moisturizing agent, only “smoothness” and “soft feeling” can be obtained.

The water-soluble humectant is composed of at least one selected from the group consisting of polyhydric alcohols, sugars, and amino acid compounds. Examples of the polyhydric alcohol include glycerin, diglycerin, and propylene glycol. Examples of the saccharide include sorbitol, xylitol, glucose and the like. Examples of amino acid compounds include PCA soda (manufactured by Ajinomoto Co., Inc.).
The water-soluble humectant gives “suppleness” and “moist feeling”. Therefore, when the texture improving agent contains a water-soluble moisturizing agent and does not contain a water-soluble softening agent, only “softness” and “moist feeling” can be obtained. When the texture improving agent is blended with a water-soluble moisturizing agent and a water-soluble softening agent, both characteristics can be obtained.

The amount of the surfactant containing an aliphatic group having 8 to 24 carbon atoms added to the base paper is 0.2 to 5 wt% in terms of the dry fiber weight ratio of the base paper, and the water-soluble organopolysiloxane and the water-soluble organopolysiloxane The total amount of the water-soluble derivative added to the base paper is preferably 0.02 to 2 wt% in terms of dry fiber weight ratio.
Moreover, it is preferable that the amount of the water-soluble humectant added to the base paper is 1 to 15 wt% in terms of dry fiber weight ratio.
As described above, the sanitary paper is preferably creped.

  Moreover, if the liquid viscosity of the water-soluble moisturizing component and the flexible component to be applied is 200 cP (mPa · s) or less at 25 ° C., it can be stably applied, and more preferably 20 to 100 cP (mPa · s). If the viscosity is too high, the transfer to the base paper becomes worse, unevenness is likely to occur, and the coating speed may be reduced.

It goes without saying that the present invention is not limited to the above-described embodiments, and extends to various modifications and equivalents included in the spirit and scope of the present invention.
When coating on both surfaces of the web 100, it is preferable to place the two headers 60 on the front and back of the web 100, respectively, in which case the coating portion 4a on the surface of the web 100 and the coating portion 4a on the back surface It is better to shift the position.
In addition, since water which is a solvent breaks the hydrogen bond of the pulp fiber in the base paper, when the water-soluble moisturizing component and the soft component are diluted with water, the water-soluble moisturizing component and the soft component are 50% by mass or more. It is preferable.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated concretely, this invention is not limited to these examples of course.

<Experimental example A>
In the paper machine shown in Fig. 1, raw paper (toilet paper, basis weight 17.6g / m ² , NBKP 40wt%, LBKP60wt%) is mixed and made, and the following texture improver is used just before the reel drum 13. On one side, an amount (liquid amount) shown in Table 1 per dry fiber weight of the base paper was applied using a header 60 (orifice 61) to obtain a sanitary paper.
Texture improving agent: An aqueous solution composed of 1 wt% of polyether-modified dimethyl silicone and 99 wt% of glycerin, having a specific gravity of 1.25 g / cm 3 and a viscosity of 70 cp (25 ° C.).
The coating amount of the texture improving agent was determined by actually measuring the coating amount of each example and comparative example by hot water extraction and toluene extraction, and subtracting the blank extraction amount.
The following adhesive was applied to the web 100 from the Yankee spray 10 and then creped by the creping doctor 11. Further, the following release agent was applied to the Yankee dryer 8 to improve the peeling of the web 100 after the creping process.
Adhesive: Creptrol A6115 (Riken Green)
Release agent: Santor FT (manufactured by Nikka Chemical)

<Experiment B>
In the paper machine shown in Fig. 1, raw paper (tissue paper, basis weight 13.8g / m ² , NBKP40wt%, LBKP60wt%) is blended and wet paper strength enhancer (Arafix 255 made by Arakawa Chemical Co., Ltd.) 0.2 wt% added) and the paper is made, and the amount shown in Table 2 per dry fiber weight of the base paper using the header 60 (orifice 61) on the one side of the base paper just before the reel drum 13 (liquid amount) The sanitary paper was obtained.
The composition of the texture improving agent and the measurement of the coating amount were the same as in Experimental Example A.
The following adhesive was applied to the web 100 from the Yankee spray 10 and then creped by the creping doctor 11. Further, the following release agent was applied to the Yankee dryer 8 to improve the peeling of the web 100 after the creping process.
Adhesive: Creptrol A6115 (Riken Green)
Release agent: Santor FT (manufactured by Nikka Chemical)

<Measurement>
1. Basis weight The basis weight (g / m ² ) of the final sanitary paper was measured according to JIS P8124.
2. Thickness The final sanitary paper thickness (mm / 10 sheets) was measured with a Peacock dial gauge under a load of 40 g / cm ² .
3. Hand feel The feel of the texture-improving agent on the sanitary paper was evaluated by five panelists 2 days after the application. Evaluation was made in 5 grades (5: very good, 4: excellent, 3: normal, 2: slightly inferior, 1: inferior), and the average value of 5 people was used. If the rating is “3” or higher, there is no practical problem.
4). Liquid dripping The presence or absence of liquid dripping was determined by visual observation of the surface of the texture-improving agent during the operation of the paper machine.
5. Appearance Appearance was evaluated visually by the following criteria for the obtained sanitary paper. If the evaluation is ○, there is no practical problem.
○: No wrinkle is generated △: Wrinkle is generated ×: There is coating unevenness

  The obtained results are shown in Table 1 for toilet paper (Experimental Example A) and in Table 2 for facial tissue paper (Experimental Example B).

  As is clear from Tables 1 and 2, in each case, a predetermined amount of a water-soluble texture improving agent was applied to the base paper (tissue paper or toilet paper) by an orifice between the outlet of the Yankee dryer and the reel. Therefore, the texture improvement effect was sufficiently obtained, the hand feeling was excellent, and no dripping or poor appearance occurred.

On the other hand, in Comparative Examples 1 and 11 in which the water-soluble texture improving agent was not applied, the texture improving effect was not obtained and the hand feel was inferior.
In Comparative Examples 2 and 12, in which the texture improving agent was gravure coated off-line, the texture improving effect was obtained, but the paper thickness was reduced and wrinkles were generated compared to the Examples, and the appearance was inferior.
In the case of Comparative Example 3 where the discharge amount of the texture improving agent from the orifice exceeded 1900 ml / min per 1 m of the axial length of the orifice, a large amount of the texture improving agent was applied, and the texture improving effect was obtained. Liquid dripping or poor appearance occurred.
In the case of Comparative Example 4 in which the discharge amount of the texture improving agent from the orifice is less than 720 ml / min per 1 m of the axial length of the orifice, the coating amount of the texture improving agent is small and the texture improving effect cannot be obtained. Feel inferior.
In both Comparative Example 5 in which the central angle (wrap angle) θ is less than 30 ° and Comparative Example 6 in which θ exceeds 90 ° as shown in FIG. 3, the contact time of the base paper with the header outer surface is shortened, and the base paper There was less familiarity with the chemical solution and dripping occurred.
In the case of Comparative Examples 7 and 15 in which the interval between the orifices exceeded 10 mm, an appearance defect due to coating unevenness occurred.
In the case of Comparative Examples 8 and 16 in which the diameter of the orifice exceeded 2.5 mm, appearance defects due to coating unevenness occurred.

  In the case of Comparative Examples 13 and 14 where the diffusion plate shown in FIG. 4 is not used in the manufacture of facial tissue paper, the contact time of the base paper with the outer surface of the header is shortened, and the familiarity of the chemical solution with the base paper is reduced. Who happened.

5 Felt 8 Yankee dryer 13 Reel 100 Base paper

Claims (3)

A sanitary paper manufacturing method in which a texture improving agent containing a water-soluble softening agent and / or a water-soluble humectant is applied to the surface of a base paper for tissue paper at a dry fiber weight ratio of 10 to 14.3 wt% with respect to the base paper. There,
In the paper making process of the base paper, between the reels that wind up the base paper from the exit of the Yankee dryer, the diameters are spaced at intervals of 3.2 to 10 mm on at least one side of the base paper in the direction perpendicular to the winding direction. A plurality of orifices of 0.5 to 2.0 mm are brought into contact, and the texture improving agent is discharged from the orifices at 720 to 1900 ml / min per 1 m of the axial length of the orifices.
A back-up plate or a back-up roll is provided on the back side of the web at the position where the texture improving agent is applied, facing the orifice.
The orifice is opened at a predetermined position of the header, and at least the outer surface of the header where the orifice is opened has an arc shape, the base paper is in contact with the arc-shaped surface, and when viewed from the axial direction of the header, A central angle θ of the arc from the most upstream position of the base paper contacting the arcuate surface to the most downstream position θ = 30 to 90 °, and the orifice is located upstream of θ / 2,
A method for manufacturing sanitary paper, wherein the base paper is supported by a diffusion plate on the downstream side of the orifice and is in contact with the arcuate surface. The water-soluble softener comprises at least one selected from the group consisting of a surfactant containing an aliphatic group having 8 to 24 carbon atoms, a water-soluble organopolysiloxane, and a water-soluble derivative of the water-soluble organopolysiloxane,
The method for producing sanitary paper according to claim 1, wherein the water-soluble humectant comprises at least one selected from the group consisting of polyhydric alcohols, sugars, and amino acid compounds.   The method for producing sanitary paper according to claim 1 or 2, wherein the base paper is pressed by a support roll and in contact with the arc-shaped surface upstream of the orifice.

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