JP6441597B2 - Paper tube and sanitary paper roll - Google Patents

Description

  The present invention relates to a paper tube and a sanitary paper roll.

  For example, sanitary paper rolls in which web-like sanitary paper such as toilet paper and kitchen paper are wound around a paper core are commercially available. As a roll core of such a sanitary paper roll, one having sufficient strength to prevent the sanitary paper roll from being crushed is required.

  As the sanitary paper roll core, a spiral paper tube formed by spirally winding a plurality of base papers is used. As such a spiral paper tube, there is a two-layer spiral paper tube formed by spirally winding two base papers together with an adhesive (see JP 2011-105340 A).

  The spiral paper tube described in Japanese Patent Application Laid-Open No. 2011-105340 uses two single glossy papers as an outer side base paper and an inner side base paper, and the gloss of the inner side base paper and the outer side base paper. The surface is bonded together. However, the spiral paper tube with the non-glossy surface of the inner side base paper and the glossy side of the outer side base paper may have sufficient strength depending on the type and amount of adhesive that bonds the two base papers. There is a problem that it cannot be obtained.

JP 2011-105340 A

  In view of the above problems, an object of the present invention is to provide a spiral paper tube having sufficient strength, and further provide a sanitary paper roll that has high production efficiency and is not easily crushed. In the present application, the “strength” of the spiral paper tube mainly intends mechanical strength such as “crush strength” with respect to the crushing force in the radial direction.

  The present invention made to solve the above problems is a spiral paper tube that is formed by spirally winding an outer surface side base paper and an inner surface side base paper together with an adhesive and used as a core of a sanitary paper roll. The outer side base paper and the inner side base paper are single glossy paper, and the glossy surface of the outer side base paper and the glossy surface of the inner side base paper are bonded together.

  Since the spiral paper tube is formed by bonding the glossy surfaces of the outer side base paper and the inner side base paper made of single glossy paper, the adhesive has an anchoring force on the surface layer of the glossy surfaces of the two base papers. It penetrates slightly to such an extent that it can exert the effect, hardly penetrates into the deep layer, and even a small amount of adhesive can fill the gap between the two base papers. For this reason, it is difficult to cause uneven adhesion between the two base papers, and the strength of the bonded paper tube is increased. In addition, since the spiral paper tube has a non-glossy surface on the outer peripheral surface and the inner peripheral surface, when the sanitary paper is wound, the penetration of the adhesive for adhering the start end of the hygienic paper to the non-glossy surface increases. Since the penetration of the adhesive is kept low, it is possible to prevent excessive adhesion of the adhesive to the sanitary paper, and it is easy to uniformly apply to the outer peripheral surface, and the mandrel shaft is formed when the spiral paper tube is wound around the mandrel shaft. It is possible to uniformly apply the lubricant to the inner peripheral surface for improving the slipperiness, and contribute to the improvement of the production efficiency of the sanitary paper roll.

The outer surface side base paper and the inner surface side base paper are formed by papermaking raw material pulp containing 50% by mass or more and 100% by mass or less of kraft pulp, and the basis weight of the outer surface side base paper and the inner surface side base paper is 100 g / m ² or more and 180 g / m ² or less, and the coating amount of the adhesive is preferably 3 g / m ² or more and 10 g / m ² or less. By reducing the amount of adhesive used while using a low basis weight single glossy kraft paper in this way, great strength can be obtained by laminating the glossy surfaces of the outer side base paper and the inner side base paper, The production efficiency is high and the effect of not being easily crushed becomes remarkable.

  It is preferable that the internal appearance sizing agent is contained as a papermaking chemical, and the peak appearance time of the penetration characteristic curve of the glossy surface measured by a dynamic liquid permeability measuring apparatus is 0.1 second or more and 2 seconds or less. In this way, it contains an internally added sizing agent, and the peak appearance time of the penetration characteristic curve is within the above range, so that the penetration of the adhesive into the base paper is minimized and sufficient adhesion with a small amount of adhesive. Strength is obtained.

The glossy surface Beck smoothness of the outer surface side base paper and the inner surface side base paper is 40 seconds or more and 100 seconds or less, and the Beck smoothness of the non-gloss surface of the outer surface side base paper and the inner surface side base paper is 5 seconds or more and 20 seconds. It is preferable that the density of the outer surface side base paper and the inner surface side base paper be 0.5 g / cm ³ or more and 1.0 g / cm ³ or less. Thus, by making the smoothness and density of the base paper within the above ranges, it is possible to ensure sufficient permeability of the non-glossy surface while suppressing the penetration of the adhesive into the glossy surface.

  In addition, a sanitary paper roll according to the present invention includes the spiral paper tube and a web-like sanitary paper wound around the spiral paper tube.

  The sanitary paper roll can provide high productivity because the spiral paper tube has high strength and is not easily crushed. In addition, since the outer peripheral surface of the spiral paper tube is configured by the non-glossy surface of the outer side base paper, the sanitary paper roll can be easily applied with a uniform adhesive that bonds one end of the sanitary paper to the spiral paper tube. Since the adhesiveness of sanitary paper can be improved, production efficiency is high and it can be provided at a lower cost.

  The sanitary paper may be toilet paper, and the outer peripheral surface of the spiral paper tube may be impregnated with a fragrance. In the sanitary paper roll, since the outer peripheral surface of the spiral paper tube is composed of the non-glossy surface of the outer side base paper, the spiral paper tube is excellent in impregnation of the fragrance, and excess fragrance is retained by retaining the fragrance on the non-glossy surface. Can suppress the volatilization and maintain the fragrance for a long time.

  Here, the “glossy surface” refers to the surface in contact with the Yankee dryer in the drying process after papermaking, and the “non-glossy surface” refers to the opposite surface. “Mass%” is the ratio of dry mass. “Basis weight” is a value measured according to JIS-P-8124 (2011). “Coating amount” is the value of the dry mass per unit area of the coated adhesive or the like. “Peak appearance time of glossy surface permeation characteristic curve measured by dynamic liquid permeability measurement device” is measured as ultrasonic transmission intensity using, for example, “TECFACE AND SIZING TESTER (EST-12)” of Emtec. This is the time when the liquid permeability reaches the maximum value in the trajectory of the liquid permeability. The “Beck smoothness” is a value measured according to JIS-P-8119 (1998). “Density” is a value measured according to JIS-P-8118 (1998).

  Since the spiral paper tube of the present invention is formed by bonding the glossy surfaces of the outer surface side base paper and the inner surface side base paper as described above, it has a relatively large strength. In addition, the sanitary paper roll of the present invention uses the spiral paper tube as a core, so that it is not easily crushed and can provide high productivity.

It is a typical perspective view which shows the spiral paper tube of one Embodiment of this invention. FIG. 2 is a schematic plan view showing a method for manufacturing the spiral paper tube of FIG. 1. It is typical sectional drawing which shows the layer structure of the spiral paper tube of FIG. It is a figure which illustrates the outer surface side base paper and inner surface side base paper penetration characteristic curve of the spiral paper tube of this invention. It is a typical perspective view of a sanitary paper roll provided with the spiral paper tube of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.

[Spiral paper tube]
As shown schematically in FIG. 2, the spiral paper tube 1 shown in FIG. 1 is bonded to the outer surface side base paper 2 and the inner surface side base paper 3 on the cylindrical mandrel shaft S as shown in FIG. 4 is formed by being spirally wound around each other. The spiral paper tube 1 is used as a winding core of a sanitary paper roll such as a toilet paper roll or a kitchen paper roll.

The crushing strength of the spiral paper tube 1 is preferably 1.0 kg / cm ² or more and 3.0 kg / cm ² or less. When the crushing strength is less than the lower limit, the spiral paper tube 1 may be easily crushed when the sanitary paper is wound. When the crushing strength exceeds the above upper limit, the strength of the spiral paper tube 1 is increased more than necessary, and the suitability for processing such as cutting may be reduced. “Crushing strength” refers to a push-pull in which a spiral paper tube is placed on a surface plate with its central axis lying horizontally, and a flat jig with a circular planar shape and an area of 1 cm ² is attached to the tip. Measured as the pressure when the spiral paper tube is squeezed vertically at the center position in the longitudinal direction with a gauge and the tip of the push-pull gauge is pushed to the original spiral paper tube center axis position (squeezed in half in the radial direction). Is the value to be

<Base paper>
The outer surface side base paper 2 is single glossy paper, and has a glossy surface 2a and a non-glossy surface 2b. The inner side base paper 3 is also a single glossy paper and has a glossy surface 3a and a non-glossy surface 3b. As shown in FIG. 3, the spiral paper tube 1 is formed by bonding a glossy surface 2 a of the outer surface side base paper 2 and a glossy surface 3 a of the inner surface side base paper 3.

  The outer side base paper 2 and the inner side base paper 3 are formed by making a pulp slurry containing raw pulp containing kraft pulp and drying it using a Yankee dryer. The outer side base paper 2 and the inner side base paper 3 may be paper-made under the same conditions, or may be paper-made under different conditions. You may mix | blend various papermaking chemical | medical agents with the said pulp slurry. Further, the outer side base paper 2 and the inner side base paper 3 may be so-called multilayer paper.

  The kraft pulp in the raw material pulp of the outer side base paper 2 and the inner side base paper 3 includes hardwood bleached kraft pulp (LBKP), softwood bleached kraft pulp (NBKP), hardwood semi-bleached kraft pulp (LSBKP), and softwood semi-bleached kraft. Examples include pulp (NSBKP), hardwood unbleached kraft pulp (LUKP), and softwood unbleached kraft pulp (NUKP), and one or more of these can be used.

  As raw material pulp other than the kraft pulp, stone ground pulp (SGP), pressurized stone ground pulp (PGW), refiner ground pulp (RGP), thermomechanical pulp (TMP), chemi-ground pulp (CGP), groundwood pulp ( GP) etc. mechanical pulp, tea waste paper, craft envelope waste paper, magazine waste paper, newspaper waste paper, leaflet waste paper, office waste paper, corrugated waste paper, Kamihiro waste paper, Kent waste paper, imitation waste paper, old paper waste paper, etc. , Disaggregation / deinking waste paper pulp, disaggregation / deinking / bleaching waste paper pulp, pulp manufactured from non-wood fibers such as kenaf, hemp, straw, etc., and one or more of these can be used .

  The lower limit of the content of the kraft pulp in the raw material pulp of the outer side base paper 2 and the inner side base paper 3 is preferably 50% by mass, more preferably 70% by mass, and even more preferably 90% by mass or more. On the other hand, the upper limit of the content of kraft pulp in the raw material pulp is 100% by mass. When the content of the kraft pulp in the raw material pulp is less than the lower limit, the strength and the like of the outer surface side base paper 2 and the inner surface side base paper 3 cannot be within a desired range, and as a result, the spiral paper tube 1 There is a possibility that the strength of is insufficient.

  Moreover, as said kraft pulp, it is more preferable that softwood kraft pulp is included. The lower limit of the content of softwood kraft pulp in the raw material pulp of the outer surface side base paper 2 and the inner surface side base paper 3 is preferably 20% by mass, and more preferably 30% by mass. On the other hand, the upper limit of the content of the softwood kraft pulp in the raw material pulp of the outer surface side base paper 2 and the inner surface side base paper 3 is not particularly limited. When the content of the softwood kraft pulp in the raw material pulp is less than the lower limit, the strength of the outer surface side base paper 2 and the inner surface side base paper 3 and thus the spiral paper tube 1 may be insufficient.

  The outer side base paper 2 and the inner side base paper 3 may contain paper making chemicals such as a pH adjuster, a sizing agent, a paper strength enhancer, a dye, a slime control agent, a pitch control agent, and an antifoaming agent.

  It is preferable that the outer surface side base paper 2 and the inner surface side base paper 3 contain an internal sizing agent (a sizing agent added to the pulp slurry) as a papermaking chemical. The internally added sizing agent suppresses moisture absorption of the outer surface side base paper 2 and the inner surface side base paper 3 and suppresses strength reduction due to moisture absorption of the spiral paper tube 1.

  Examples of the sizing agent include rosin-based sizing agents, alkyl ketene dimers, alkenyl succinic anhydrides, and one or more of these can be used. In particular, a rosin emulsion type sizing agent that can easily form a sizing film on the surface of the raw pulp fiber by the heat of the Yankee dryer is preferably used. Although a surface sizing agent can be used in combination, it is preferable to adjust the sizing effect with an internal sizing agent in order to obtain appropriate permeability of the adhesive to the non-glossy surface.

  As a minimum of the addition amount of the sizing agent in a pulp slurry, 0.1 mass% is preferable with respect to raw material pulp, and 0.2 mass% is more preferable. On the other hand, the upper limit of the addition amount of the sizing agent is preferably 0.5% by mass and more preferably 0.4% by mass with respect to 100 parts by mass of the raw material pulp. When the addition amount of the sizing agent is less than the lower limit, the permeability of the adhesive to the glossy surface of the outer surface side base paper 2 and the inner surface side base paper 3 is increased, and the strength of the spiral paper tube 1 is insufficient. There is a fear. Moreover, when the addition amount of the sizing agent exceeds the upper limit, the permeability of the adhesive to the non-glossy surface of the outer side base paper 2 is reduced, and the start end of the sanitary paper cannot be reliably bonded to the spiral paper tube 1. There is a fear.

  Examples of paper strength enhancers include dry paper strength enhancers such as cationic starch, oxidized starch, polyacrylamide, polyvinyl alcohol, and styrenemaleic acid copolymers, and wet paper strength enhancers such as polyamide epichlorohydrin. These 1 type or multiple types can be used.

  Further, a surface treatment agent may be applied to the non-glossy surface 2b of the outer surface side base paper 2 and the non-glossy surface 3b of the inner surface side base paper 3 within a range that does not inhibit slippage.

The lower limit of the basis weight of the outer surface side base paper 2 and the inner surface side base paper 3, preferably ^{100g / m 2, 120g / m} 2 is more preferable. In contrast, the upper limit of the basis weight of the outer surface side base paper 2 and the inner surface side base sheet 3, preferably 180 g / ^{m 2,} and more preferably 170 g / ^{m 2.} When the basis weight of the outer surface side base paper 2 and the inner surface side base paper 3 is less than the lower limit, the strength of the outer surface side base paper 2 and the inner surface side base paper 3 and thus the spiral paper tube 1 may be insufficient. When the basis weight of the outer surface side base paper 2 and the inner surface side base paper 3 exceeds the above upper limit, the strength of the outer surface side base paper 2 and the inner surface side base paper 3 and thus the spiral paper tube 1 becomes unnecessarily large, and the cutting is performed. The suitability for processing such as processing may be reduced.

  The permeation characteristic curves of the glossy surface 2a of the outer surface side base paper 2 and the glossy surface 3a of the inner surface side base paper 3 (changes in liquid permeability over time, and shows the peak value of the liquid permeability value as 100%). As illustrated in FIG. 4, it is preferable to rise once to have a peak and then descend. The lower limit of the peak appearance time of the permeation characteristic curves of the glossy surface 2a of the outer surface side base paper 2 and the glossy surface 3a of the inner surface side base paper 3 is preferably 0.1 seconds, and more preferably 0.3 seconds. On the other hand, the upper limit of the peak appearance time of the permeation characteristic curve of the glossy surface 2a of the outer side base paper 2 and the glossy surface 3a of the inner side base paper 3 is preferably 2 seconds, and more preferably 1.5 seconds. When the peak appearance time of the permeation characteristic curves of the glossy surface 2a and the glossy surface 3a is less than the lower limit, the adhesive for bonding the outer surface side base paper 2 and the inner surface side base paper 3 is the glossy surface 2a and the glossy surface 3a. The adhesive strength between the outer surface side base paper 2 and the inner surface side base paper 3 may be insufficient, and the necessary amount of adhesive may be excessive. In addition, when the peak appearance time of the penetration characteristic curves of the glossy surface 2a and the glossy surface 3a exceeds the upper limit, the adhesive hardly penetrates into the outer surface side base paper 2 and the inner surface side base paper 3, and therefore the glossy surface 2a and the glossy surface. Adhesiveness to the adhesive 3a becomes insufficient, and the spiral paper tube 1 may be easily crushed when the sanitary paper is wound.

  The penetration characteristic curves of the non-glossy surface 2b of the outer surface side base paper 2 and the non-glossy surface 3b of the inner surface side base paper 3 are preferably monotonously decreased as illustrated in FIG. As the permeation characteristic curve of the non-glossy surface 2b of the outer surface side base paper 2 is monotonously decreased, a fragrance or the like can be soaked into the outer peripheral surface of the spiral paper tube 1. Further, since the permeation characteristic curve of the non-glossy surface 3b of the inner surface side base paper 3 is monotonously decreased, a lubricant for improving the slipperiness with the mandrel shaft S when the spiral paper tube 1 is manufactured is used. It is possible to apply uniformly to the non-glossy surface 3b.

  The lower limit of the Beck smoothness of the glossy surface 2a of the outer side base paper 2 and the glossy surface 3a of the inner side base paper 3 is preferably 40 seconds, and more preferably 50 seconds. On the other hand, the upper limit of the Beck smoothness of the glossy surface 2a of the outer surface side base paper 2 and the glossy surface 3a of the inner surface side base paper 3 is preferably 100 seconds, and more preferably 90 seconds. When the Beck smoothness of the glossy surface 2a and the glossy surface 3a is less than the lower limit, the adhesive easily penetrates into the glossy surface 2a and the glossy surface 3a, and sufficient adhesion between the outer surface side base paper 2 and the inner surface side base paper 3 is achieved. There is a risk that the amount of adhesive required to obtain strength increases. Moreover, when the Beck smoothness of the glossy surface 2a and the glossy surface 3a exceeds the upper limit, the adhesive strength of the adhesive to the glossy surface 2a and the glossy surface 3a becomes insufficient, and the strength of the spiral paper tube 1 becomes insufficient. There is a fear.

  The lower limit of the Beck smoothness of the non-glossy surface 2b of the outer side base paper 2 is preferably 5 seconds, and more preferably 8 seconds. On the other hand, the upper limit of the Beck smoothness of the non-glossy surface 2b of the outer side base paper 2 is preferably 20 seconds, and more preferably 15 seconds. When the Beck smoothness of the non-glossy surface 2b of the outer surface side base paper 2 is less than the lower limit, the adhesive for adhering the leading edge of the sanitary paper to the spiral paper tube 1 is likely to permeate the outer surface side base paper 2 excessively. There is a risk that the productivity of the spiral paper tube 1 may be lowered due to poor adhesion or a large amount of adhesive may be required. In addition, when the Beck smoothness of the non-glossy surface 2b of the outer surface side base paper 2 exceeds the above upper limit, the permeability of the adhesive for adhering the start end of the sanitary paper to the outer surface side base paper 2 is low, and also due to poor adhesion The productivity of the spiral paper tube 1 may be reduced.

  The lower limit of the Beck smoothness of the non-glossy surface 3b of the inner surface side base paper 3 is preferably 5 seconds, and more preferably 8 seconds. On the other hand, the upper limit of the Beck smoothness of the non-glossy surface 3b of the inner surface side base paper 3 is preferably 20 seconds, and more preferably 15 seconds. When the Beck smoothness of the non-glossy surface 3b of the inner surface side base paper 3 is less than the lower limit, a lubricant for ensuring slipperiness with the mandrel shaft S is produced when the spiral paper tube 1 is manufactured. There is a possibility that the paper 3 penetrates into the inside and the inner side base paper 3 slips with respect to the mandrel shaft S and the productivity of the spiral paper tube 1 decreases. Further, when the Beck smoothness of the non-glossy surface 3b of the inner side base paper 3 exceeds the above upper limit, the adhesion with the mandrel shaft S is increased, and the coating of the lubricant necessary for ensuring the slipperiness is performed. An increase in the amount may increase the manufacturing cost of the spiral paper tube.

As a minimum of the density of outer surface side base paper 2 and inner surface side base paper 3, 0.5 g / cm ³ is preferred and 0.6 g / cm ³ is more preferred. On the other hand, the upper limit of the density of the outer surface side base paper 2 and the inner surface side base paper ³ is preferably 1.0 g / cm ³ , and more preferably 0.9 g / cm ³ . When the density of the outer surface side base paper 2 and the inner surface side base paper 3 is less than the above lower limit, the adhesive easily penetrates into the glossy surface 2a and the glossy surface 3a, and the outer surface side base paper 2 and the inner surface side base paper 3 are sufficient. There is a possibility that the amount of the adhesive required to obtain a sufficient adhesive strength increases. Further, when the density of the outer surface side base paper 2 and the inner surface side base paper 3 exceeds the above upper limit, the strength of the outer surface side base paper 2 and the inner surface side base paper 3 and thus the spiral paper tube 1 becomes larger than necessary, and the cutting process is performed. There is a risk that suitability for processing such as the above will decrease.

The lower limit of the Cobb water absorption was measured by a contact time of 2 minutes of non-gloss surface 3b of the non-gloss surface 2b and the inner surface side base paper 3 of the outer surface side base paper 2, preferably ^{30g / m 2, 40g / m} 2 Gayori preferable. On the other hand, the upper limit of the Cobb water absorption was measured by a contact time of 2 minutes of non-gloss surface 3b of the non-gloss surface 2b and the inner surface side base paper 3 of the outer surface side base paper 2, preferably ^{70g / m 2, 50g / m} 2 Is more preferable. When the Cobb water absorption of the non-glossy surface 2b and the non-glossy surface 3b is less than the lower limit, the pulp fibers may be difficult to disaggregate when recycling the paper tube as used paper. Moreover, when the above-mentioned Cobb water absorption of the non-glossy surface 2b and the non-glossy surface 3b exceeds the above upper limit, there is a risk that the amount of adhesive used for bonding the sanitary paper start end to the spiral paper tube 1 will be excessively increased, There is a possibility that the productivity of the sanitary paper roll may decrease due to poor adhesion. The “Cobb water absorption” is a value measured according to JIS-P-8140 (1998).

<Adhesive>
As the adhesive 4, a water-soluble adhesive in which a binder is dissolved in water is used. As the binder, a water-soluble binder, a latex binder, or the like can be used. Examples of the water-soluble binder include proteins such as gelatin, albumin, and casein, starches such as pregelatinized starch, oxidized starch, etherified starch, and esterified starch, celluloses such as carboxymethylcellulose and hydroxymethylcellulose, agar, Examples thereof include water-soluble natural polymer compounds such as alginic acid and gum arabic, and water-soluble synthetic polymer compounds such as polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylic acid, polyacrylamide and maleic acid copolymer. Examples of the latex binder include styrene butadiene latex, acrylonitrile / butadiene latex, acrylate latex, vinyl acetate latex, vinylidene chloride latex, methyl methacrylate / butadiene latex, and carboxy-modified latex thereof. Among these, starches that are easily dissolved in water when the spiral paper tube 1 is recycled as used paper are preferable.

The lower limit of the coating amount of the adhesive 4 in the spiral paper tubes 1 is preferably ^{3g / m 2, 5g / m} 2 is more preferable. In contrast, the upper limit of the coating amount of the adhesive 4 in the spiral paper tubes 1, preferably from 10 g / ^{m 2,} more preferably 8 g / ^{m 2.} When the coating amount of the adhesive 4 on the spiral paper tube 1 is less than the lower limit, the adhesion between the outer surface side base paper 2 and the inner surface side base paper 3 becomes insufficient, and the strength of the spiral paper tube 1 may be insufficient. There is. Moreover, when the coating amount of the adhesive 4 in the spiral paper tube 1 exceeds the upper limit, the cost of the spiral paper tube 1 may increase unnecessarily.

<Spiral paper tube manufacturing method>
The manufacturing method of the spiral paper tube 1 includes a step of forming glossy paper constituting the outer surface side base paper 2 and the inner surface side base paper 3, and the outer surface side base paper 2 and the inner surface side base paper 3 are bonded together. And forming the mold.

(Single glossy paper forming process)
The single glossy paper forming step includes a step of preparing a pulp slurry, a step of making a paper of the prepared pulp slurry, a step of pressing and pressing the paper that has been made, and a step of drying the pressed paper with a Yankee dryer And have.

[Pulp slurry preparation process]
In the pulp slurry preparation step, a pulp slurry is prepared by dispersing raw pulp containing kraft pulp in water and adding papermaking chemicals.

[Paper making process]
In the paper making process, the prepared pulp slurry is made with a wire mesh.

[Water extraction process]
In the squeezing process, the paper is squeezed to squeeze out moisture.

[Drying process]
In the drying step, the squeezed paper is dried to a moisture content of, for example, 12% or less with a Yankee dryer. At this time, the surface of the paper that contacts the Yankee dryer becomes a glossy surface.

(Paper tube forming process)
In the paper tube forming step, the glossy paper obtained in the glossy paper forming step is used as the outer side base paper 2 and the inner side base paper 3, and the glossy surface 2a of the outer side base paper 2 or the inner side base paper 3 A step of applying the adhesive 4 to the glossy surface 3a, a step of applying a lubricant (wax or oil) to the non-glossy surface 2b of the inner side base paper 3, and an outer side base paper 2 and an inner side base paper 3 A step of laminating the outer surface side base paper 2 and the inner surface side base paper 3 by being spirally wound around a cylindrical mandrel shaft S, and a cylindrical body in which the outer surface side base paper 2 and the inner surface side base paper 3 are bonded together. Cutting to a predetermined length.

[Adhesive coating process]
In the adhesive coating process, the adhesive 4 for bonding the outer side base paper 2 and the inner side base paper 3 to the glossy surface 2a of the outer side base paper 2 or the glossy surface 3a of the inner side base paper 3 is applied. To do.

[Lubricant coating process]
In the lubricant coating process, a lubricant that improves the slipping on the mandrel shaft S is applied to the non-glossy surface 3 b of the inner surface side base paper 3. Examples of the lubricant include liquid paraffin. As the coating amount of the lubricant is, for example, 0.005 g / ^{m 2} or more 0.05 g / ^{m 2} or less.

[Lamination process]
In the bonding process, the inner base paper 3 and the outer base paper 2 are wound around the mandrel shaft S in a spiral manner, and the two are laminated together to continuously form a long cylindrical body. At this time, the formed cylindrical body is pulled out from the mandrel shaft S in the axial direction.

[Cutting process]
In the cutting step, the spiral paper tube 1 is formed by cutting the cylindrical body that is continuously formed and extended into a predetermined length.

[Sanitary paper roll]
The sanitary paper roll of FIG. 5 includes the spiral paper tube 1 and a web-like sanitary paper 5 wound around the spiral paper tube 1.

<Sanitary paper>
Examples of the sanitary paper 5 include toilet paper and kitchen paper.

  In the sanitary paper roll, the starting end of the sanitary paper 5 is bonded to the outer peripheral surface of the spiral paper tube 1, that is, the non-glossy surface 2b of the outer surface side base paper 2 with an adhesive.

  As the adhesive applied when the sanitary paper 5 starts to be wound around the spiral paper tube 1 in this way, a water-soluble adhesive in which a binder is dissolved in water is used. As the binder, a water-soluble binder, a latex binder, or the like can be used. Examples of the water-soluble binder include proteins such as gelatin, albumin, and casein, starches such as pregelatinized starch, oxidized starch, etherified starch, and esterified starch, celluloses such as carboxymethylcellulose and hydroxymethylcellulose, agar, Examples include water-soluble natural polymer compounds such as alginic acid and gum arabic, and water-soluble synthetic polymer compounds such as polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylic acid, polyacrylamide, and maleic acid copolymers. Examples of the latex binder include styrene butadiene latex, acrylonitrile / butadiene latex, acrylic ester latex, vinyl acetate latex, vinylidene chloride latex, methyl methacrylate / butadiene latex and carboxy-modified latex thereof. Among these, starches that are easily dissolved in water when the spiral paper tube 1 is recycled as used paper are preferable.

The application amount of the adhesive applied when the sanitary paper 5 starts to be wound around the spiral paper tube 1 is preferably 0.2 g / m ² or more and 0.6 g / m ² or less. When the application amount of the adhesive is less than the lower limit, the manufacturing efficiency of the sanitary paper roll may be reduced due to the start of the sanitary paper 5 being peeled off. Moreover, when the application amount of the adhesive exceeds the above upper limit, the adhesive penetrates too much into the sanitary paper, so that the sanitary paper sticks to each other and a problem occurs when a general consumer uses the sanitary paper.

  In the sanitary paper roll, the outer peripheral surface of the spiral paper tube 1, that is, the non-glossy surface 2b of the outer surface side base paper 2 may be impregnated with a fragrance.

<Advantages>
The spiral paper tube 1 is formed by adhering the glossy surface 2a of the outer surface side base paper 2 and the glossy surface 3a of the inner surface side base paper 3 with the adhesive 4, so that the outer surface side base paper 2 of the adhesive 4 and There is little penetration into the inner side base paper 3. Thereby, the spiral paper tube 1 can be manufactured at a low cost by reducing the amount of the adhesive 4 used, and the outer surface side base paper 2 and the inner surface side base paper 3 are firmly bonded to each other and have a high strength.

  Moreover, since the non-gloss surface 3b of the inner surface side base paper 3 is arranged on the inner periphery of the spiral paper tube 1, a lubricant for ensuring slipperiness on the mandrel shaft S in the bonding process is uniformly applied. Easy to do. Thereby, the said spiral paper tube 1 improves production efficiency, and can be provided more cheaply.

  In addition, the spiral paper tube 1 uses a small amount of adhesive and is easy to be dissolved and recycled as used paper.

  The sanitary paper roll is formed by wrapping the sanitary paper 5 around the spiral paper tube 1, that is, the non-glossy surface 2 b of the outer side base paper 2. Application of an adhesive for adhering to the spiral paper tube 1 is easy and reliable. Thereby, the sanitary paper roll has high production efficiency and can be provided at low cost.

  Moreover, the non-glossy surface 2b of the outer surface side base paper 2 has appropriate water absorption. For this reason, it is easy to perfume the sanitary paper roll by impregnating the non-glossy surface 2b of the outer surface side base paper 2 with the fragrance and the non-glossy surface 2b of the outer surface side base paper 2 slows the fragrance. Since it volatilizes, the scent of the sanitary paper roll lasts a long time.

[Other Embodiments]
The said embodiment does not limit the structure of this invention. Therefore, in the above-described embodiment, the components of each part of the above-described embodiment can be omitted, replaced, or added based on the description of the present specification and the common general knowledge, and they are all interpreted as belonging to the scope of the present invention. Should.

  EXAMPLES Hereinafter, although this invention is explained in full detail based on an Example, this invention is not interpreted limitedly based on description of this Example.

(Base paper)
As the outer surface side base paper and the inner surface side base paper, single glossy paper formed by making a pulp slurry having the same composition was prepared.

  As raw material pulp for the base paper, 30% by mass of softwood bleached kraft pulp with a Canadian standard freeness of 600 mL and 70% by mass of hardwood bleached kraft pulp with a Canadian standard freeness of 450 mL were used. “Canada standard freeness” is a value measured according to JIS-P-8121-2 (2012).

  An internal sizing agent, a pH adjuster, and a paper strength enhancer were added to the pulp slurry in which the raw material pulp was dissolved.

  As the internally added sizing agent, 0.3% by mass of an acidic rosin sizing agent was added to the raw material pulp.

  As a pH adjuster, a sulfuric acid band was used to adjust the pH of the pulp slurry to 5.0.

  As the paper strength enhancer, a polyacrylamide type paper strength enhancer was added in an amount of 0.08% by mass based on the raw material pulp.

Papermaking the pulp slurry, a basis weight of the inner surface side base paper and basis weight of 160 g / cm ³ was obtained an outer side base paper 140g / cm ^3.

  The Beck smoothness of the glossy surface and the non-glossy surface of the inner surface side base paper and the outer surface side base paper was measured according to JIS-P-8119 (1998). As a result, the inner side base paper had a glossy surface Beck smoothness of 43 seconds and a non-glossy surface Beck smoothness of 8 seconds. On the other hand, the outer side base paper had a glossy surface Beck smoothness of 46 seconds and a non-glossy surface Beck smoothness of 10 seconds.

Moreover, the density of the inner surface side base paper and the outer surface side base paper was measured according to JIS-P-8118 (1998). As a result, the density of the inner surface side base paper is 0.80 g / cm ^3, the density of the outer surface side base paper was 0.81 g / cm ^3.

(Examples 1-3)
As shown in Table 1, a spiral having a two-layer structure is formed by winding the glossy surface of the inner side base paper and the glossy side of the outer side base paper with an adhesive having a coating amount of 3 g / m ^{2 in} a spiral manner. A paper tube example 1 was obtained. In addition, Example 2 of the spiral paper tube was obtained by winding the glossy surface of the inner surface side base paper and the glossy surface of the outer surface side base paper in a spiral manner while bonding them together with an adhesive having a coating amount of 6 g / m ² . Further, Example 3 of the spiral paper tube was obtained by winding the glossy surface of the inner surface side base paper and the glossy surface of the outer surface side base paper in a spiral manner while bonding them together with an adhesive having a coating amount of 10 g / m ² .

(Comparative Examples 1-4)
Further, Comparative Example 1 of a spiral paper tube is obtained by winding the glossy surface of the inner side base paper and the non-glossy side of the outer side base paper with an adhesive having a coating amount of 3 g / m ^{2 in} a spiral manner. It was. Furthermore, the spiral paper tube comparative example 2 was obtained by winding the glossy surface of the inner side base paper and the non-glossy side of the outer side base paper with an adhesive having a coating amount of 11 g / m ^{2 in} a spiral manner. . Further, the spiral paper tube comparative example 3 is obtained by winding the non-glossy surface of the inner side base paper and the glossy surface of the outer side base paper in a spiral manner while bonding them together with an adhesive having a coating amount of 3 g / m ^2. It was. Further, a spiral paper tube comparative example 4 was obtained by winding the non-glossy surface of the inner surface side base paper and the glossy surface of the outer surface side base paper with an adhesive having a coating amount of 11 g / m ^{2 in} a spiral manner. .

The results of measuring the crushing strength of Examples 1 to 3 and Comparative Examples 1 to 4 of these spiral paper tubes are shown in Table 1. As a method for measuring crushing strength, a push-pull gauge in which a spiral paper tube is placed on a surface plate with its central axis lying horizontally and a flat jig with a circular planar shape and an area of 1 cm ² is attached to the tip. Measured the pressure when the spiral paper tube was squeezed vertically at the longitudinal center position and the tip of the push-pull gauge was pushed to the original spiral paper tube central axis position (squeezed in half in the radial direction). . This measurement was performed at five locations each, and the average value was taken as the crushing strength.

  Furthermore, in order to produce a sanitary paper roll (toilet paper roll) using Examples 1 to 3 and Comparative Examples 1 to 4 of the spiral paper tube, and to bond the required coating amount of the lubricant and the leading edge of the sanitary paper The required amount of adhesive applied is also shown in Table 1.

As shown in the table, the crushing strength of Example 1 of the spiral paper tube in which the glossy surfaces of the inner side base paper and the outer side base paper are bonded to each other with an adhesive having a coating amount of 3 g / m ² is 1.0 kg / cm. ^2, crushing strength of the example 2 of the spiral paper tubes adhered gloss surfaces of the inner surface side base paper and the outer surface side base paper with an adhesive coated amount 6 g / m ² is at 1.5 kg / cm ² The crushing strength of Example 3 of the spiral paper tube in which the glossy surfaces of the inner surface side base paper and the outer surface side base paper are bonded to each other with an adhesive having a coating amount of 10 g / m ² is 1.8 kg / cm ^2. It had a preferable strength as a sanitary paper roll paper tube. On the other hand, the crushing strengths of Comparative Examples 2 and 4 of the spiral paper tube in which the glossy surface and the non-glossy surface of the inner surface side base paper and the outer surface side base paper are bonded with an adhesive having a coating amount of 11 g / m ² are as follows. Both were 1.8 kg / cm ² , and had a preferable strength as a sanitary paper roll paper tube, but the glossy surface of the inner side base paper and the outer side base paper were not coated with an adhesive having a coating amount of 3 g / m ^2. The crushing strengths of Comparative Example 1 and Comparative Example 3 of the spiral paper tube bonded with the glossy surface were both 0.8 kg / cm ² , and did not have a preferable strength as a sanitary paper roll paper tube. That is, it was confirmed that high strength can be obtained with a small amount of adhesive by bonding the glossy surfaces of the inner surface side base paper and the outer surface side base paper.

In Examples 1 to 3 and Comparative Examples 1 and 2 in which the glossy surface of the inner side base paper was bonded to the outer side base paper, the required coating amount of the lubricant was 0.02 g / m ² . respect, Comparative examples 3 and 4 that the non-glossy surface was adhered on the outer surface side base paper of the inner surface side base paper, the coating amount of lubricant may exceed the preferred ranges and 0.06 g / m ² is required confirmed.

In Examples 1 to 3 and Comparative Examples 3 and 4 in which the glossy surface of the outer side base paper is bonded to the inner side base paper, the amount of adhesive applied to bond the start end of the sanitary paper is 0. while was 4g / m ^2, Comparative example was bonded to a non-glossy surface of the outer surface the base paper on the inner surface side base paper 1 and 2, application of the adhesive needed to adhere the leading end of the sanitary paper It was confirmed that the amount exceeded 0.7 g / m ² and the preferred range.

  The spiral paper tube according to the present invention can be widely used as a core of a sanitary paper roll.

1 spiral paper tube 2 outer side base paper 2a glossy surface 2b non-glossy surface 3 inner side base paper 3a glossy surface 3b non-glossy surface 4 adhesive 5 sanitary paper

Claims (6)

A spiral paper tube that is formed by spirally winding an outer surface side base paper and an inner surface side base paper together with an adhesive and used as a core of a sanitary paper roll,
The outer side base paper and the inner side base paper are single glossy paper,
The inner surface of the outer surface side base paper and the outer surface of the inner surface side base paper are bonded together by an adhesive, the outer surface of the outer surface side base paper and the inner surface of the inner surface side base paper are non-glossy surfaces, and the outer surface side base paper And the outer surface of the inner side base paper is a glossy surface,
A spiral paper tube, wherein the glossy surface of the outer side base paper and the glossy side of the inner side base paper are bonded together. The outer side base paper and the inner side base paper are formed by papermaking a raw material pulp containing 50% by mass or more and 100% by mass or less kraft pulp,
The basis weight of the outer surface side base paper and the inner surface side base paper is 100 g / m ² or more and 180 g / m ² or less, respectively.
The spiral paper tube according to claim 1, wherein the coating amount of the adhesive is 3 g / m ² or more and 10 g / m ² or less. Contains internal sizing agents as papermaking chemicals,
The spiral paper tube according to claim 1 or 2, wherein a peak appearance time of the gloss characteristic curve of the glossy surface measured by a dynamic liquid permeability measurement device is 0.1 second or more and 2 seconds or less. The glossy surface Beck smoothness of the outer side base paper and the inner side base paper is 40 seconds or more and 100 seconds or less,
The Beck smoothness of the non-glossy surface of the outer side base paper and the inner side base paper is 5 seconds or more and 20 seconds or less,
4. The spiral paper tube according to claim 1, wherein the density of the outer side base paper and the inner side base paper is 0.5 g / cm ³ or more and 1.0 g / cm ³ or less.   A sanitary paper roll comprising the spiral paper tube according to any one of claims 1 to 4 and a web-like sanitary paper wound around the spiral paper tube. The sanitary paper is toilet paper,
The sanitary paper roll according to claim 5, wherein the outer peripheral surface of the spiral paper tube is impregnated with a fragrance.

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