JP5590205B2 - Paper tube manufacturing method and rolled sanitary paper with the paper tube as a core - Google Patents

Description

  The present invention relates to a method for producing a paper tube used as a roll core of roll-like sanitary paper such as toilet paper and kitchen towel, and a roll-like sanitary paper having the paper tube.

  For roll sanitary paper such as toilet paper and kitchen towel, for example, apply an adhesive to the outer peripheral surface of a long core tube that forms the core, and bond the wide end of the sanitary paper through the coating. After fixing the wide sanitary paper for the product length around the long core tube to make a roll, the wide sanitary paper is widened by fixing the end of the wide sanitary paper to the outer peripheral surface of the roll It can be manufactured by forming (log) and finally cutting the log into the product width with a cutting blade such as a log saw (see, for example, Patent Documents 1 and 2).

  In the manufacturing method, a paper tube made of cardboard or the like is often used as the core tube. As a method of manufacturing such a paper tube, a plurality of strips are fed in an oblique direction with respect to the axis of the mandrel shaft, the plurality of strips are wound around the mandrel shaft in a spiral shape, There is known a method for obtaining a long paper tube by laminating strips of paper (see, for example, Patent Documents 3 to 5).

Japanese Utility Model Publication No. 6-86687 JP-A-2005-87788 JP-A-51-100321 JP-A-52-042927 Japanese Patent No. 2762255

  Incidentally, some printing may be performed on the outer surface of the paper tube for the purpose of displaying predetermined information. For example, a lot number is printed to specify a product number of a paper tube.

  However, when printing is performed on the outer surface of the paper tube as described above, the printing ink elutes in the adhesive when the sanitary paper is bonded and fixed to the paper tube, and the printing ink oozes out on the sanitary paper. Therefore, there was a problem of sanitizing sanitary paper. In particular, in winter when the temperature is low, the adhesive is difficult to dry, and the printing ink tends to elute into the adhesive, so that the above problem tends to become apparent. When the printing ink oozes out on the sanitary paper in this way, the sanitary paper cannot be used up until the last roll due to functional, hygienic or aesthetic problems, which is not preferable.

  In the manufacturing method described in Patent Document 3, a transparent or translucent belt-like paper (translucent belt-like paper) is further wound around and bonded to the outer peripheral surface of a printed paper tube. In the manufacturing method described in the above, the printed surface adheres the sanitary paper to the outer peripheral surface of the paper tube by further winding and bonding the translucent belt-shaped paper on which the printing has been performed so that the printed surface is inside. It is configured not to be exposed to the surface. Therefore, it is considered that bleeding of the printing ink is suppressed to some extent.

  However, since the manufacturing methods described in Patent Documents 3 to 5 use translucent belt-like paper in addition to the belt-like paper used as the core material of the paper tube, the number of belt-shaped papers fed into the mandrel increases (paper tube). If there are two lines of strip-shaped paper as the core material, the number is at least three.) Accordingly, there is a problem that the manufacturing cost of the paper tube is increased by the amount of the translucent strip paper in addition to the increase in size and complexity of the manufacturing equipment and the difficulty in manufacturing.

  The present invention has been made in view of the above-described problems of the prior art, and printing ink can be applied to sanitary paper with simple equipment without using a belt other than the belt used as the core of the paper tube. It is an object of the present invention to provide a paper tube manufacturing method capable of manufacturing a paper tube which does not easily bleed out, and a roll-like sanitary paper having the paper tube as a core.

  As a result of intensive studies to solve the above-mentioned problems, the present inventors have developed a printed strip-shaped paper that has been printed as a plurality of strip-shaped papers that serve as the core material of the paper tube and a non-printed strip-shaped paper that has not been printed. Used, by winding the non-printing strips spirally while shifting the position relative to the surface of the printing strips wound spirally around the mandrel shaft, and superimposing both strips on each other, and then bonding the two strips together The present inventors have found that the above problems can be solved, and have completed the present invention. That is, according to the present invention, the following paper tube manufacturing method and roll-like sanitary paper having the paper tube as a core are provided.

[1] Of the plurality of strips used as the core material of the paper tube, the strip disposed immediately below the strip disposed in the outermost layer of the paper tube is printed on its surface to form a printed strip. The printing belt is fed in an oblique direction with respect to the axis of the mandrel shaft so that the surface of the printing belt is a surface located outward with respect to the central axis of the mandrel shaft with respect to the mandrel shaft. The belt-like paper disposed in the outermost layer of the paper tube is a non-printing belt-like paper that is not printed on its surface, and an adhesive is applied to the back surface of the non-printing belt-like paper. Forming an adhesive layer, feeding the non-printing strip in an oblique direction with respect to the axial direction of the mandrel shaft, and shifting the position relative to the printing strip wound around the mandrel shaft Both the non-printing strips are spirally wound around the surface of the printing strips wound around the mandrel shaft so that the surface of the non-printing strips is a surface located outside the paper tube. A method of manufacturing a paper tube in which strips of paper are superposed on each other and the two strips of paper are pasted together by the adhesive layer to obtain a paper tube, wherein the non-printed strip of paper is disposed immediately below the non-printed strip of paper When the print strip is peeled from the print strip, the print strip and the non-print strip are separated so that only a part of the non-print strip or only the non-print strip is peeled off and a printing part remains on the print strip. A method for manufacturing a paper tube, in which an adhesive strength with a printing belt, a paper quality of the non-printing belt, and a paper quality of the printing belt are set.

[2] A roll-like sanitary paper in which a long sanitary paper is wound into a roll around a paper tube to be a core, and the paper tube has a printing strip shape on the surface of which is printed as a core material Paper and a non-printing strip whose surface is not printed, wherein the non-printing strip is positioned on the outermost layer of the paper tube, and the surface of the non-printing strip is positioned outside the paper tube. And the printing belt is directly under the non-printing belt, and the surface of the printing belt is a surface positioned outward with respect to the central axis of the paper tube. The non-printing belt-like paper is spirally wound on the surface of the printing belt-like paper that is arranged in such a manner as to be displaced from the printing belt-like paper. Is rolled up, and both strips are bonded together by an adhesive layer. When the non-printing strip is separated from the printing strip disposed immediately below the non-printing strip, only a part of the non-printing strip or the non-printing strip is peeled off. Thus, a roll shape in which the adhesive strength between the printing strip and the non-printing strip, the paper quality of the non-printing strip and the paper quality of the printing strip is set so that the printing portion remains on the printing strip Sanitary paper.

  The method for producing a paper tube according to the present invention can produce a paper tube in which printing ink hardly oozes on sanitary paper without using a belt-like paper other than the belt-like paper used as the core material of the paper tube, with simple equipment. it can. Moreover, since the roll-like sanitary paper according to the present invention effectively suppresses the oozing of the printing ink from the paper tube to the sanitary paper, the sanitary paper is hardly damaged. Therefore, the sanitary paper can be used up to the last roll, and waste is hardly generated.

It is a schematic process drawing which shows typically one embodiment of the manufacturing method concerning the present invention. It is a schematic perspective view which shows typically an example of the paper tube obtained by the manufacturing method which concerns on this invention. It is a schematic process drawing which shows typically an example of the process of manufacturing roll-like sanitary paper concerning the present invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a method for producing a paper tube according to the present invention and a form for carrying out a roll-like sanitary paper having the paper tube as a core will be described in detail with reference to the drawings. However, the present invention broadly encompasses a paper tube manufacturing method and roll-like sanitary paper having the invention-specific matters, and is not limited to the following embodiments.

[1] Definitions etc .:
A “paper tube” is a tubular body with paper as a core, and a plurality of strips of paper used as a core are wound in a spiral shape so that their positions are shifted from each other, and these strips are attached to each other. It is intended to mean what is combined (such a paper tube may be referred to as a “spiral paper tube”).

  “Rolled sanitary paper” means sanitary paper in a form in which a long sanitary paper is wound into a roll shape around a paper tube serving as a winding core. Specific products include rolled toilet paper, rolled kitchen towels, and the like.

[2] Features of the production method according to the present invention:
In the manufacturing method according to the present invention, as shown in FIG. 1, a plurality of strips 2 serving as the core material of the paper tube 1 are printed on the strip 6 and the surface is printed. The non-printing strip 10 is spirally wound around the surface of the printing strip 8 wound spirally around the mandrel shaft 4 while shifting the position relative to the printing strip 8. Both strips are overlapped, and the print strip 8 and the non-print strip 10 are bonded together. At this time, the non-printing strip 10 is disposed on the outermost layer of the paper tube 1, and the printing strip 8 is disposed immediately below the non-printing strip 10.

  According to the method as described above, it is possible to obtain the paper tube 1 having a structure in which the surface of the print belt 8 is coated with the non-print belt 10 as shown in FIG. The paper tube 1 having the structure as shown in FIG. 2 has no printing belt 8 (ie, printing ink) exposed on the outer peripheral surface to which the adhesive for sanitary paper is applied, and the adhesive for sanitary paper fixing. And printing ink are not in direct contact. Further, as the strip-shaped paper used as the core material, it is common to use thick paper instead of thin paper such as the translucent strip-shaped paper described in Patent Documents 3 to 5, and the effect of suppressing the penetration of the adhesive is also high. . Therefore, it is possible to effectively suppress the bleeding of the printing ink onto the sanitary paper during the production of the roll sanitary paper.

  Further, in the manufacturing method according to the present invention, as shown in FIG. 1, the paper tube 1 can be obtained by the printed belt-like paper 8 and the non-printing belt-like paper 10 which are the core material of the paper tube 1, and the belt-like material other than the core material is obtained. Paper (for example, a belt-like paper used exclusively for covering a printing layer such as the translucent belt-like paper described in Patent Documents 3 to 5) is not required. Accordingly, it is possible to obtain the paper tube 1 that can suppress the bleeding of the printing ink onto the sanitary paper by using the same simple equipment as that of a normal paper tube without increasing the number of strips fed to the mandrel shaft.

  The indication of the lot number etc. printed on the printed strip is illuminated from the inside of the paper tube, or the non-printed strip attached to the surface of the printed strip is peeled off to remove the outer surface of the paper tube. Visible from the side.

[3] Embodiment of manufacturing method according to the present invention:
The manufacturing method according to the present invention includes a step of performing printing 6 on a part of the strip-shaped paper 2 as a core material of the paper tube 1 as shown in FIG. 1, a step of winding the printed strip-shaped paper 8 in a spiral shape, The steps of applying the adhesive 12 to the non-printing strip 10, the step of winding the non-printing strip 10 in a spiral shape, and the step of bonding the printing strip 8 and the non-printing strip 10 are provided as essential steps. And other steps such as a cutting step.

[3-1] Strip paper:
In the manufacturing method of the present invention, as shown in FIG. 1, a plurality of strip-shaped papers 2 serving as the core material of the paper tube 1 are used. As the plurality of strips 2, a print strip 8 having a print 6 on its surface and a non-print strip 10 having no print on its surface are used. That is, it is necessary to use at least two strips 2. However, the number of strips used is not limited to two, and three or more can be used. In addition, although a different thing may be used for the base paper of a printing strip and a non-printing strip, the same thing is normally used.

  “Becomes the core material of the paper tube” means that the “strip paper” includes only the belt paper that functions as the core material of the paper tube. This means that a belt or the like used exclusively for coating the printed layer, such as the translucent belt described, is not included. Examples of paper used as the core material of the paper tube include paper tube base paper, cardboard base paper, and craft paper.

  “Strip-shaped paper” is an elongated paper. In the manufacture of a paper tube that serves as a roll of sanitary roll paper, a strip-shaped paper having a width of 70 to 85 mm is often used.

Specifically, it is preferable to use a single-layered strip-shaped paper having a thickness of 180 to 500 μm and a density of 0.4 to 1.5 g / cm ³ . By setting the appropriate thickness and density of the strip paper, it is possible to sufficiently prevent the printing ink from penetrating the strip paper and seeping into the outer surface of the paper tube. The printed contents can be easily confirmed. Also, by using a single-layer paper strip, when stripping the strip placed on the outer surface side of the paper tube and checking the print contents, there is no delamination of the strip and the strip is peeled cleanly Can do.

If the thickness is less than 180 μm or the density is less than 0.4 g / cm ³ , the printing ink may permeate the inside of the belt-like paper and ooze out to the outer surface of the paper tube. In addition, the strength as the core material may not be sufficiently secured. On the other hand, if the thickness is 500 μm and the density exceeds 1.5 g / cm ³ , it may be difficult to wind the belt around the mandrel shaft. Also, there are cases where the printed content cannot be easily confirmed when illumination is applied from the inside of the paper tube. In addition, more paper raw material than necessary may be used, leading to increased costs.

As the paper satisfying the above conditions, trade name “TP core base paper” manufactured by Oji Paper Co., Ltd. (thickness: 229 μm, density 0.65 g / cm ³ , real rice tsubo 149.7 g / m ² , tensile strength (longitudinal) 8 0.1 kN / m, tensile strength (horizontal) 3.6 kN / m, elongation (longitudinal) 1.8%, elongation (horizontal) 4.3%) and the like can be suitably used. Here, “thickness” and “density” mean “thickness” and “density” measured in accordance with the method described in JIS P8188.

[3-2] Printing process:
In the manufacturing method of the present invention, as shown in FIG. 1, among the plurality of strips 2 serving as the core material of the paper tube 1, the strips disposed immediately below the strip 2 disposed in the outermost layer of the paper tube 1. Printing 6 is applied to the surface of the paper 2 to obtain a printing belt 8. By this printing, necessary information can be displayed on a part of the paper tube.

  As shown in FIG. 1, the print 6 is applied to the surface of the strip-shaped paper 2, that is, the surface located outside the paper tube 1. By adopting such a structure, the necessary information can be easily visually recognized from the outer surface side of the paper tube 1 by illuminating from the inside of the paper tube or by peeling the non-printing strip 10 from the paper tube 1. can do.

  The printing method is not particularly limited, and conventionally known printing methods, for example, relief printing such as flexographic printing, lithographic printing such as offset printing, intaglio printing such as gravure printing, stencil printing such as silk screen printing, and by inkjet printer Printing methods such as plateless printing such as printing can be employed. Necessary information displayed by printing is not particularly limited, and various information such as position information with respect to the width of the base paper, manufacturing factory, and machine number can be displayed in addition to the lot number.

  The manufacturing method shown in FIG. 1 is an example in which printing 6 for displaying the lot number of the paper tube 1 is performed on the surface of the belt-like paper 2 by the ink jet printer 14. In this example, JP-K32A (ethanol 75 to 85 mass%, chromium complex dye 5 to 10 mass%) manufactured by Hitachi is used as the printing ink, and TH-TYPE D (ethanol manufactured by Hitachi) is used as the auxiliary liquid for the printing ink. 99-100 mass%) was used as an inkjet printer.

[3-3] Printing belt-like paper winding step:
In the manufacturing method of the present invention, as shown in FIG. 1, the printing belt 8 is fed in an oblique direction d with respect to the axis L of the mandrel shaft 4 and wound around the mandrel shaft 4 in a spiral shape.

  The “mandrel shaft” is a columnar or cylindrical core rod for winding a belt-shaped paper. Usually, it is made of metal such as iron. “Axis” means a line corresponding to the central axis (rotation axis) of a cylindrical or cylindrical mandrel shaft. As shown in FIG. 1, a spiral paper tube can be obtained by feeding the belt-like paper 2 in an oblique direction d with respect to the axis L. The outer diameter of the mandrel shaft is formed to a dimension that substantially matches the inner diameter of the paper tube.

  Pulleys 18 and 20 for driving the belt 22 are attached to the mandrel shaft 4. As the pulleys 18 and 20 rotate in the direction of the arrow, the belt 22 spanned between the pulleys 18 and 20 and the mandrel shaft 4 travels, and the belt 2 (printing strip 8 and non-printing strip 10) is pulled out. The belt is wound around the mandrel shaft 4 in a spiral shape, and both belt-like papers are bonded to each other and fed out toward the lower side in FIG.

  In the manufacturing method of the present invention, the same mandrel shaft, pulley, and belt as those conventionally used for manufacturing paper tubes can be used.

  “An oblique direction” means a direction other than a direction parallel to or perpendicular to the axis of the mandrel shaft. Although the angle is not limited, it is preferable to feed the printing strip 8 at an angle of 45 ° ± 40 ° downward with respect to the axis of the mandrel shaft. The manufacturing method shown in FIG. 1 is an example in which a method for feeding the printing belt 8 at an angle of 45 degrees downward with respect to the axis L of the mandrel shaft 4 is adopted.

  The number of print strips is not particularly limited, but is preferably one, and the mandrel shafts are arranged so that the side edges of the print strips are adjacent to each other and the side edges of the print strips do not overlap. It is preferable to wind around. That is, it is preferable that the printed belt is wound in a single layer. By doing so, it is possible to easily confirm the print contents when illumination is applied from the inside of the paper tube.

  However, before the printing belt is wound, another belt serving as a core material of the paper tube may be wound around the mandrel shaft in advance, and the printing belt may be wound around the surface of the belt. In this case, in order to ensure the visibility of the printed content when the illumination is applied from the inside of the paper tube, it is preferable to stop the number of other belt-like papers to one. In this case, as the entire paper tube, three strips of non-print strip (outermost layer), print strip (second layer), and other strip (innermost layer) are used.

[3-4] Adhesive coating process:
In parallel with the printing step and the printing belt winding step, in the manufacturing method of the present invention, as shown in FIG. 1, the strip 2 disposed in the outermost layer among the plurality of strips 2 is printed on the surface thereof. The non-printing strip 10 is not applied, and an adhesive 12 is applied to the back surface of the non-printing strip 10 to form an adhesive layer. With this adhesive layer, it is possible to obtain the paper tube 1 by bonding the printed strip 8 and the non-printed strip 10 together.

  As shown in FIG. 1, the adhesive 12 is applied to the back surface of the non-printing strip 10, that is, the surface located inside the paper tube 1. With such a structure, the non-printing strip 10 and the printing strip 8 can be bonded together.

  The type of adhesive and the amount of coating may be appropriately selected according to the manufacture of conventionally known spiral paper tubes. As the adhesive, a conventionally known paper adhesive, specifically, a water-soluble adhesive such as a vinyl acetate resin emulsion adhesive can be suitably used.

  Among them, it is preferable to use a vinyl acetate resin emulsion adhesive having a solid content of 40 to 50% and a viscosity of 500 to 4000 mPa · s. By using such an adhesive, when stripping the strip placed on the outer surface side of the paper tube and checking the printed content, the strip can be peeled cleanly and the printed content can be easily checked be able to. Specifically, trade name “Polysol Adhesive-2620” manufactured by Showa Polymer Co., Ltd. (main component: vinyl acetate resin, solid content: 42.0 to 46.0% (105 ° C. × 1 hour), viscosity: 1500 ˜2500 mPa · s (23 ° C., BH viscometer, 10 rpm)), trade name “JW-6601” manufactured by Sekisui Fuller (main component: vinyl acetate resin, solid content: 44.5%, viscosity: 3000 mPa · s) (30 ° C.)) and the like can be preferably used.

  If the solid content is less than 40% or the viscosity is less than 500 mPa · s, the printing ink may elute into the adhesive and penetrate the inside of the belt-like paper and ooze out to the outer surface of the paper tube. On the other hand, when the solid content is 50% or the viscosity exceeds 4000 mPa · s, coating of the adhesive becomes difficult, coating unevenness occurs, the adhesive strength decreases, or the bonding cannot be performed reliably. May cause problems.

Although it does not specifically limit about the coating amount, It is preferable to apply | coat an adhesive within the range of 10-30 g / m < ² > of coating amounts, and to form an adhesive layer. If the coating amount is less than 10 g / m ² , the adhesive strength may be reduced, or there may be a problem that the bonding cannot be reliably performed. On the other hand, if the coating amount exceeds 30 g / m ² , the printing ink may elute into the adhesive and penetrate the inside of the belt-like paper and ooze out to the outer surface of the paper tube. Note that a releasable adhesive may be used in order to facilitate the peeling of the non-printing strip.

  The method of applying the adhesive is not particularly limited, and a conventionally known adhesive application method, for example, a method of applying the adhesive using a transfer roller, a coating sponge, or the like can be employed. In the manufacturing method shown in FIG. 1, the adhesive 12 is impregnated into the application sponge 16, and the application sponge 16 is brought into contact with the back surface of the non-printing strip paper 10, whereby the adhesive 12 is applied to the back surface of the non-printing strip paper 10. This is an example of adopting the method.

[3-5] Non-printing belt-like paper winding step:
In the manufacturing method of the present invention, as shown in FIG. 1, the non-printing strip 10 is fed in an oblique direction d with respect to the direction of the axis L of the mandrel shaft 4, and the printing strip 8 wound around the mandrel shaft 4 is mutually connected. The non-printing strip 10 is spirally wound around the surface of the printing strip 8 wound around the mandrel shaft 4 while shifting the position.

  In the conventional method for manufacturing a paper tube, the printed belt is wound around the non-printed belt wound around the mandrel shaft 4 so that the printed portion is exposed on the outer surface of the paper tube in order to make the printed portion visible. It was. However, unlike the design printing or the like, the display of the lot number and the like does not need to be visible at all times, and may be confirmed when a product defect or the like occurs. Therefore, in the manufacturing method of the present invention, the non-printing strip is wound around the surface of the printing strip wound around the mandrel shaft 4. Even in a paper tube having such a structure, the display of the lot number or the like printed on the printing belt can be confirmed by illuminating from the inside of the paper tube or by peeling the non-printing belt.

  “While shifting the position of the printing belt-like paper” means that the winding position (that is, the winding pitch) of the printing belt-like paper and the non-printing belt-like paper is shifted. In this way, even when a uniform width strip is used as the print strip and the non-print strip, the non-print strip is bonded so as to join the joints of the print strip. A tube can be formed. The method of shifting the winding position is not particularly limited. From the viewpoint of forming a paper tube by reliably bonding the non-printing strip and the printing strip, the non-printing strip like the paper tube 1 shown in FIG. 1 or FIG. It is preferable to shift the winding position of the paper 10 and the printing belt 8 by half a pitch.

  The non-printing strip is not spirally wound around the mandrel shaft, but is spirally wound around the “printing strip wound around the mandrel shaft”. By doing so, the printing applied to the surface of the printing strip can be covered with the non-printing strip.

  The winding method can be performed according to the printing belt-like paper winding process. Wrap in a single layer without overlapping non-printing strips. In the production method of the present invention, the non-printing strip is disposed on the outermost layer, and the printing strip is disposed immediately below it. Therefore, the number of non-printing strips is one. That is, the total number of strips used in the entire paper tube is preferably 2 to 3 in total including the printed strips and the non-printed strips. According to such a method, a paper tube in which two to three paper layers are laminated can be obtained.

[3-6] Bonding step:
In the manufacturing method of the present invention, a paper tube is obtained by mutually bonding a print strip and a non-print strip with the adhesive layer formed in the adhesive coating step. As shown in FIG. 1, by rotating the pulleys 18 and 20 and running the belt 22, the print belt 8 and the non-print belt 10 can be spirally wound around the mandrel shaft 4 while shifting the positions of each other. Yes, both belts can be pasted together.

  By the bonding step, a long paper tube (spiral wound body 26) in which the printing strip 8 and the non-printing strip 10 are bonded together is continuously formed. The size of the paper tube is generally set to an outer diameter of 35 to 50 mmφ and a thickness of 0.5 to 1.5 mm, depending on the type of roll-like sanitary paper.

[3-7] Cutting step:
As shown in FIG. 1, the spiral wound body 26 formed in the bonding process can be formed into a long paper tube by cutting with a cutting blade 28.

  In this cutting step, it is preferable to cut the spirally wound body into one having a length of 10 to 30 times the width of the roll-like sanitary paper as the final product to obtain a long paper tube. By using such a long paper tube, a plurality of roll-like sanitary papers can be produced at a time.

  As a cutting blade, the same thing as the log saw and the band saw used in the log cutting process mentioned later can be used conveniently.

[3-8] Adhesive strength and paper quality of printing strip and non-printing strip:
In the paper tube manufacturing method and roll-like sanitary paper according to the present invention, when the non-printing strip paper is peeled off, only a part of the non-printing strip paper or only the non-printing strip paper is peeled off to form the printing strip-like paper. The adhesive strength between the print strip and the non-print strip (adhesive force by the adhesive layer), the quality of the non-print strip, and the quality of the print strip are set so that the printing portion remains. That is, when the non-printing strip is peeled off, the adhesive strength between the printing strip and the non-printing strip, the quality of the non-printing strip, and the quality of the printing strip so that a part of the printing strip does not peel off. Is set. Thereby, the non-printing strip can be peeled off and the content printed on the printing strip can be confirmed reliably and easily.

[4] Embodiment of roll-like sanitary paper according to the present invention:
The roll-like sanitary paper according to the present invention uses a paper tube obtained by the manufacturing method according to the present invention described above as a core, and the long sanitary paper is wound into a roll around the core (paper tube). It will be taken. By using the paper tube according to the manufacturing method of the present invention as the winding core, the bleeding of the printing ink from the paper tube to the sanitary paper is effectively suppressed. Accordingly, the sanitary paper is not easily soiled by the printing ink, and the sanitary paper can be used up to the last roll, and waste is hardly generated.

[4-1] Paper tube:
The paper tube obtained by the manufacturing method of the present invention, like the paper tube 1 shown in FIG. 1 and FIG. 2, is not printed on the surface and the printed strip 8 having the surface 6 printed as a core material. The non-printing strip 10 is disposed on the outermost layer of the paper tube 1 and the printing strip 8 is disposed immediately below the non-printing strip 10 and is wound in a spiral shape. A non-printing strip paper 10 is spirally wound on the surface of the printing strip 8 so as to shift the position of the printing strip 8 with respect to each other, and the printing strip 8 and the non-printing strip 10 are overlapped, and printed by an adhesive layer. The belt-like paper 8 and the non-printing belt-like paper 10 are bonded to each other.

[4-2] Long sanitary paper:
As the long sanitary paper, conventionally known toilet paper base paper and kitchen towel base paper can be used. For example, a base paper for toilet paper that has been made to a basis weight of 10 to 25 g / m ² can be suitably used. When the basis weight is less than 10 g / m ² , proper strength may not be ensured. On the other hand, if the basis weight exceeds 25 g / m ² , the flexibility may be impaired and the tactile sensation may become too hard.

  As the long sanitary paper, a single-layer long base paper may be used (1 ply, single), or a two-layer long base paper in which two long base papers are laminated (2 plies, double). Further, a multi-layer long base paper in which three or more long base papers are laminated can be used (multi-ply).

  The length of the long sanitary paper, that is, the winding length varies depending on the type of the roll-like sanitary paper. For example, in the case of rolled toilet paper, it is generally 25 to 90 m, and in the case of rolled kitchen towel, it is generally set to 10 to 20 m.

  The product width varies depending on the type of roll sanitary paper. For example, in the case of rolled toilet paper, it is generally 105 to 114 mm, and in the case of rolled kitchen towel, it is generally 210 to 228 mm.

[4-3] Manufacturing method:
The roll-like sanitary paper according to the present invention can be produced by the same method as a conventionally known roll-like sanitary paper, except that the paper tube according to the production method of the present invention is used as a winding core. For example, it can be produced by the following method.

[4-3a] Adhering and fixing the long sanitary paper to the paper tube:
The first step is to apply the pickup glue along the longitudinal direction of the paper tube to form the pickup glue coating portion on the outer peripheral surface of the paper tube, and to the outer peripheral surface of the paper tube via the pickup glue coating portion. This is a step of bonding and fixing the starting end of the long base paper.

  The long base paper is wider and longer than normal products (in the case of toilet paper, width 114 mm, length 50 to 60 m) (width 10-60 times the product, length 500) ˜2000 times (hereinafter referred to as “wide wide paper”) is preferably used. By using such a wide long base paper, mass production and continuous production become possible. Usually, the wide long base paper is supplied from a raw roll obtained by winding the wide long base paper into a large diameter.

  In this manufacturing method, it is preferable to use a long paper tube having a length of 10 to 60 times the width of the rolled sanitary paper as the paper tube. When such a long paper tube is used together with the wide long base paper, a plurality of roll-like sanitary papers can be produced at a time.

  The pick-up glue is an adhesive for adhering and fixing the starting end of the long base paper to the outer peripheral surface of the paper tube. The type of the adhesive is not particularly limited, but an adhesive having an adhesive strength that can quickly bond and fix the long base paper and can withstand a tensile force when winding the long base paper is preferable. Such an adhesive is preferably a water-soluble adhesive, and more preferably a cellulose derivative adhesive. Among commercially available cellulose derivative adhesives, Kanebinol TV976 and Kanebinol TV986 (both are trade names, manufactured by NSC Japan) are particularly preferred because they have a strong wet tack and excellent pick-up properties.

  The phrase “along the longitudinal direction of the paper tube” only requires that the pickup glue coating portion be formed so as to be parallel to the axial direction of the paper tube, and it is necessary that the pickup paste coating portion be continuously formed in the entire longitudinal direction. do not do.

  The pickup glue coating part can be formed by a conventionally known adhesive coating method. For example, the application | coating by a coater, the spraying by a spray, etc. can be mentioned. Among these, coating by a coater is preferable because the adhesive can be reliably applied to a desired site.

  The starting end of the long base paper is bonded and fixed to the outer peripheral surface of the paper tube through the pickup glue coating portion formed as described above. Specifically, the paper tube on which the pick-up paste coating part is formed and the long base paper are pressed and fixed to each other. In addition, it is preferable to perform this adhesion | attachment so that a pick-up paste coating part may be arrange | positioned in the position 10-150 mm away from the starting end of long base paper.

  Such a process can be performed using, for example, a winder 50 as shown in FIG. In FIG. 3, R1 to R5 indicate rolls.

  First, as shown in part A of FIG. 3, a cylindrical or columnar (rod) mandrel shaft 54 is inserted into the long paper tube 52, and the long paper tube 52 is fixed to the mandrel shaft 54. Next, as shown in part B of FIG. 3, the pick-up paste 58 is applied to the long paper tube 52 using the coater 56 to form the pick-up paste application part 60.

  Further, as shown in part C of FIG. 3, the mandrel shaft 54 to which the long paper tube 52 is fixed is moved toward the feeding roller 62, and the pick-up glue coating unit 60 and the feeding roller formed on the long paper tube 52. The wide long base paper 64 delivered from 62 is pressure-bonded. By this operation, the long paper tube 52 and the wide long base paper 64 can be bonded and fixed.

[4-3b] Winding of sanitary sanitary paper:
In the second step, a long base paper is wound around a paper tube by the product length to form a roll, and the end of the long base paper or the outer peripheral surface of the roll is formed along the width direction of the long base paper or the roll. In this step, tail seal paste is applied to form a tail seal paste coating portion, and the end portion of the long base paper is bonded and fixed to the outer peripheral surface of the roll via the tail seal paste coating portion. As described above, when a long paper tube and a wide long base paper are used, a log which is a wide roll-like sanitary paper is formed.

  The tail seal glue is an adhesive for bonding and fixing the end portion of the long base paper to the outer peripheral surface of the roll. The type of tail seal paste is not particularly limited, and is preferably an adhesive that can quickly bond and fix long base paper and has an adhesive strength that does not easily peel off. As such an adhesive, a water-soluble adhesive is preferable, and a cellulose derivative adhesive is more preferable. Among commercially available cellulose derivative adhesives, Kanebinol TV995 and Kanebinol TV997 (both trade names, manufactured by Nippon SC Co., Ltd.) are particularly preferred because of their strong wet tack and excellent drying properties.

  “Along the width direction of the long base paper” means that the tail seal paste coating portion needs to be formed so as to be parallel to the end of the long base paper and needs to be formed continuously at the end portion. do not do. The tail seal paste coating portion may be formed at the end portion of the long base paper, or may be formed on the outer peripheral surface of the roll (specifically, the portion where the end portion of the long base paper abuts). The tail seal paste coating part is preferably formed at a position 10 to 50 mm away from the end of the long base paper, or a position where the position of the long base paper abuts on the outer peripheral surface of the roll.

  The process will be described more specifically. As shown in part D of FIG. 3, the mandrel shaft 54 is rotated in the circumferential direction of the long paper tube 52 by a meshing gear or the like (not shown). By this rotation, the wide long base paper 64 is wound around the long paper tube 52 to form a roll 66. The wide long base paper 64 is wound around the long paper tube 52 by the product length and then cut. By this cutting, the end portion of the wide long base paper is formed.

  Next, as shown in part E of FIG. 3, the tail seal paste is applied to the end portion of the wide long base paper 64 using the coater 68 to form the tail seal paste application part 70. Further, the tail seal paste coating part 70 formed at the end part of the wide long base paper 64 and the outer peripheral surface of the roll 66 are pressure-bonded. By this operation, the end portion of the wide long base paper 64 and the outer peripheral surface of the roll 66 are bonded and fixed, and the log 72 which is a wide roll sanitary paper can be formed.

[4-3c] Log disconnection:
The log formed as described above is cut into a product width by a cutting blade to obtain a roll-like sanitary paper as a final product.

  As the “cutting blade”, a conventionally known cutting blade such as a log saw (round blade) or a band saw (flat blade) can be used. A blade having a thickness of 2 to 10 mm is preferably used.

  The method for producing a paper tube according to the present invention can be suitably used as a method for producing a paper tube that serves as a core for rolled sanitary paper such as rolled toilet paper and rolled kitchen towel.

1: paper tube, 2: strip-shaped paper, 4: mandrel shaft, 6: printing, 8: printed strip-shaped paper, 10: non-printed strip-shaped paper, 12: adhesive, 14: inkjet printer, 16: coated sponge, 18, 20 : Pulley, 22, 24: belt, 26: spiral wound body, 28: cutting blade, 50: winder, 52: long paper tube, 54: mandrel shaft, 56: coater, 58: pick-up glue, 60: pick-up glue coating Engineering section, 62: Delivery roller, 64: Wide long base paper, 66: Roll, 68: Coater, 70: Tail seal glue coating section, 72: Log, L: Axis, d: Diagonal direction, R1, R2, R3 R4, R5, R6: Roll.

Claims (2)

Of the plurality of strips used as the core material of the paper tube, the strip paper disposed immediately below the strip disposed in the outermost layer of the paper tube is printed on its surface to form a print strip. A belt-like paper is fed in an oblique direction with respect to the axis of the mandrel shaft, and a spiral shape is formed such that the surface of the printing belt-like paper is a surface located outward with respect to the central axis of the mandrel shaft with respect to the mandrel shaft. And wrap it around
The band-shaped paper disposed in the outermost layer of the paper tube is a non-printed band-shaped paper that is not printed on the surface, and an adhesive is applied to the back surface of the non-printed band-shaped paper to form an adhesive layer, The non-printing strip is fed in an oblique direction with respect to the axial direction of the mandrel shaft, and the printing strip is wound around the mandrel shaft while being shifted from the printing strip around the mandrel shaft. Wrapping the non-printing strip in a spiral shape so that the surface of the non-printing strip is a surface located outside the paper tube, the two strips overlap each other on the surface of the paper,
A paper tube manufacturing method for obtaining a paper tube by laminating both strips of paper with the adhesive layer,
When the non-printing strip is peeled from the printing strip disposed immediately below the non-printing strip, only a part of the non-printing strip or the non-printing strip is peeled off and the printing strip A method of manufacturing a paper tube in which an adhesive force between the printing strip and the non-printing strip, a paper quality of the non-printing strip, and a paper quality of the printing strip are set so that a printing portion remains in the printing section. A roll-like sanitary paper in which a long sanitary paper is wound into a roll shape with respect to a paper tube as a winding core,
The paper tube has a printing strip whose surface is printed as a core material and a non-printing strip whose surface is not printed,
The non-printing strip is disposed on the outermost layer of the paper tube such that the surface of the non-printing strip is a surface located outside the paper tube, and the printing strip is the non-printing strip Directly below the paper, the surface of the printing strip is arranged so that it is a surface located outward with respect to the central axis of the paper tube,
The non-printing strip is spirally wound on the surface of the printing strip wound in a spiral shape so that the positions of the printing strip are shifted from each other. ,
It is a roll-like sanitary paper in which both belts are bonded to each other by an adhesive layer,
When the non-printing strip is peeled from the printing strip disposed immediately below the non-printing strip, only a part of the non-printing strip or the non-printing strip is peeled off and the printing strip A roll-like sanitary paper in which the adhesive strength between the printing strip and the non-printing strip, the paper quality of the non-printing strip, and the paper quality of the printing strip are set so that the printing part remains on the paper.

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