WO2020059635A1 - Paper tube - Google Patents

Paper tube Download PDF

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Publication number
WO2020059635A1
WO2020059635A1 PCT/JP2019/035939 JP2019035939W WO2020059635A1 WO 2020059635 A1 WO2020059635 A1 WO 2020059635A1 JP 2019035939 W JP2019035939 W JP 2019035939W WO 2020059635 A1 WO2020059635 A1 WO 2020059635A1
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WO
WIPO (PCT)
Prior art keywords
paper
base paper
water absorption
band
shaped base
Prior art date
Application number
PCT/JP2019/035939
Other languages
French (fr)
Japanese (ja)
Inventor
瑛司 草野
宗央 小山
Original Assignee
日本製紙株式会社
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Publication date
Application filed by 日本製紙株式会社 filed Critical 日本製紙株式会社
Priority to JP2020501836A priority Critical patent/JPWO2020059635A1/en
Publication of WO2020059635A1 publication Critical patent/WO2020059635A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27J—MECHANICAL WORKING OF CANE, CORK, OR SIMILAR MATERIALS
    • B27J1/00—Mechanical working of cane or the like
    • B27J1/003—Joining the cane side by side
    • B27J1/006—Joining the cane side by side by strand or wire twisting
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47G—HOUSEHOLD OR TABLE EQUIPMENT
    • A47G19/00—Table service
    • A47G19/22—Drinking vessels or saucers used for table service
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47G—HOUSEHOLD OR TABLE EQUIPMENT
    • A47G21/00—Table-ware
    • A47G21/18—Drinking straws or the like

Definitions

  • the present invention relates to a paper cylinder, particularly a paper cylinder excellent in water resistance.
  • Plastic is widely used as a material for various products because of its low cost and easy molding, and more than 300 million tons of plastic products are produced annually. Many plastic products are disposed of properly, but some of them end up in the environment as garbage due to poor management or illegal dumping, and eventually reach the sea. The amount of plastic waste flowing into the ocean is estimated to be more than 8 million tons per year. Because many of these plastic wastes are non-biodegradable, most of them accumulate in the ocean, and by 2050 the total amount of plastic in the ocean is expected to exceed the total amount of fish (by weight).
  • Patent Documents 1 and 2 propose paper straws.
  • Means for solving the problems of the present invention are as follows.
  • the first band-shaped base paper has an inner layer that is spirally wound, and the second band-shaped base paper has an outer layer that is spirally wound,
  • the first and second band-shaped base papers have a low water absorption surface and an easy water absorption surface,
  • the first strip-shaped base paper and the second strip-shaped base paper are bonded with an adhesive. Paper cylinder according to the above. 3.
  • the third belt-shaped base paper has an intermediate layer that is spirally wound,
  • the third belt-shaped base paper is characterized in that both surfaces are easily water-absorbing surfaces and each layer is adhered with an adhesive.
  • One or both of the low water absorption surface of the first band base paper and the low water absorption surface of the second band base paper are coated with an external sizing agent.
  • Either one or both of the easily absorbable surface of the first strip base paper and the easily absorbable surface of the second strip base paper are coated with a hydrophilic surfactant.
  • the paper cylinder of the present invention is mainly made of paper and has a small environmental load.
  • the band-shaped base paper having the low water absorption surface and the easy water absorption surface used in the present invention can be continuously produced by using an on-machine type size press installed in a papermaking line, so that productivity is high. , Low cost.
  • the paper cylinder of the present invention is mainly made of paper, but has excellent water resistance, and can be suitably used for a paper cylinder used in applications that come into contact with water.
  • FIG. 2 is a partially exploded view of a paper cylinder as one embodiment of the present invention.
  • the paper cylinder of the present invention has an inner layer formed by spirally winding a first strip-shaped base paper, and an outer layer formed by spirally winding a second strip-shaped base paper.
  • the first and second band base papers used for the paper cylinder of the present invention have a low water absorption surface and an easy water absorption surface, and the inner surface of the paper cylinder has a low water absorption surface of the first band base paper and the outer surface of the paper cylinder. Are formed from the low water-absorbing surface of the second strip base paper.
  • FIG. 1 is a partially exploded view of a paper cylinder according to an embodiment of the present invention.
  • the paper cylinder 1 according to one embodiment has an inner layer 11 and an outer layer 12.
  • the inner layer 11 is formed by spirally winding a first strip-shaped base paper 110
  • the outer layer 12 is formed by spirally winding a second strip-shaped base paper 120. It is wound in a shape.
  • the first belt-shaped base paper 110 has a low water absorption surface 111 and an easy water absorption surface 112
  • the second belt base paper 120 has a low water absorption surface 121 and an easy water absorption surface 122.
  • the inner surface of the paper cylinder 1 is formed by the low water absorption surface 111 of the first band base paper 110, and the outer surface thereof is formed by the low water absorption surface 121 of the second band base paper 120.
  • the easily water-absorbing surface 112 of the first band-shaped base paper 110 and the easily water-absorbing surface 122 of the second band-shaped base paper 120 are bonded to each other with an adhesive (not shown).
  • the paper cylinder of the present invention may have at least an inner layer and an outer layer, and may have a configuration of three or more layers having one or more intermediate layers in addition to the inner layer and the outer layer.
  • the two layers of the inner layer and the outer layer, or both surfaces are easily water-absorbing surfaces. It is preferable to have three layers including one intermediate layer formed by spirally winding three strip-shaped base papers.
  • the first and second strip base papers used in the present invention have a low water absorption surface and an easy water absorption surface.
  • at least one strip-shaped base paper for forming the intermediate layer has an easily water-absorbing surface on both sides. Therefore, in the paper cylinder of the present invention, the easily water-absorbing surfaces that are easily compatible with water are adhered to each other with an adhesive, so that the respective layers are firmly adhered to each other.
  • the paper tube of the present invention is excellent in water resistance because the inner surface and the outer surface of the paper tube that are in direct contact with the liquid are formed from the low water absorbing surfaces of the first and second strip-shaped base papers.
  • the paper cylinder of the present invention hardly causes peeling between the layers and has excellent water resistance, so that it can be used for applications that come into contact with water, and can be suitably used as, for example, straws and muddlers. .
  • the overlap width (d1, d2 in FIG. 1) in the length direction of the paper cylinder is narrow because a paper cylinder with a small step can be formed.
  • the overlap width is preferably 2 mm or less, more preferably 1 mm or less, and even more preferably 0.5 mm or less.
  • forming one layer of the paper cylinder with two or more belt-shaped base papers means that, in a paper cylinder formed by spirally winding one belt-shaped base paper, two belt-shaped base papers are formed along the length direction. This is synonymous with the above cutting and is within the technical idea of the present invention.
  • the winding direction of each layer may be the same direction (S winding or Z winding) or may be different directions.
  • S winding and Z winding when the adjacent layers are wound in different directions (S winding and Z winding), the joining portion in the width direction of the strip-shaped base paper forming a certain layer and the joining portion in the width direction of the strip-shaped base paper forming the adjacent layer are formed.
  • S winding and Z winding are periodically overlapped, and a gap is likely to be formed in the overlapped portion. Therefore, it is preferable to wind in the same direction.
  • the strip-shaped base paper forming each layer is formed at the same angle with respect to the axial direction of the paper cylinder so that the joining portions in the width direction of the strip-shaped base paper forming the adjacent layers do not overlap. It is preferable to be wound in a state shifted in the band width direction. It is preferable that the shift width (D in FIG. 1) of the strip-shaped base paper forming the adjacent layer be 10% or more of the width of the strip-shaped base paper in the roll-tube length.
  • the shift width is more preferably 25% or more, more preferably 40% or more, and most preferably 50% of the width of the belt-shaped base paper in the lengthwise direction of the paper cylinder. Note that the maximum value of the deviation width is 50% of the width of the belt-shaped base paper in the length direction of the paper cylinder.
  • the diameter of the paper cylinder of the present invention is not particularly limited, and can be various diameters according to the use.
  • a paper cylinder having an inner diameter of 3 mm or more and 15 mm or less can be suitably used as a paper straw.
  • the band-shaped base paper is manufactured by cutting a paper tube base paper into a predetermined width to form a band.
  • the width of the band-shaped base paper is not particularly limited and can be appropriately adjusted depending on the diameter of the paper cylinder to be manufactured, but is usually about 8 mm or more and about 40 mm or less.
  • a paper cylinder base paper for forming the first and second belt-shaped base papers has a low water absorption surface and an easy water absorption surface.
  • the base paper for paper cylinders having a low water absorption surface and an easy water absorption surface used in the present invention can be used without particular limitation for base papers having different water absorption amounts on both surfaces.
  • a coating liquid containing a drug hereinafter, also referred to as a water-absorbing agent
  • a water-absorbing agent a drug
  • the other side of the base paper is coated with a water-absorbing agent-free coating solution, a coating solution having a different concentration of the water-absorbing agent, or a water-absorbing agent coated on one side.
  • the base paper for a cylinder serving as the first band base paper and the base paper for a cylinder serving as the second band base paper processes such as coating for forming a low water absorption surface or an easy water absorption surface are the same. And may be different.
  • the water-absorbing control agent whose action on water-absorbing property is opposite means a water-absorbing control agent applied on one side (rear surface) and a drug that has the opposite function with respect to water absorption. Is applied when an agent for increasing the water absorption is applied.
  • the value of the water absorption of the low water absorption surface obtained by the Cobb method (contact time 30 seconds) specified in JIS P8140 is preferably 20 g / m 2 or less, and more preferably 15 g / m 2 or less. More preferably, it is more preferably 12 g / m 2 or less.
  • the easily water-absorbing surface should have a higher water-absorbing degree than the low-water-absorbing surface obtained by the Cobb method (contact time 30 seconds) specified in JIS P8140, and preferably 1 g / m 2 or more. More preferably 3 g / m 2 or more, even more preferably 5 g / m 2 or more.
  • the water absorption value of each side of the band-shaped base paper obtained by the Cobb method (contact time 30 seconds) specified in JIS P8140 is: It is preferable that the value is equal to or greater than the value of the water absorption of the easily water-absorbing surface of the band-shaped base paper to be bonded. If the value of the water absorption of the band-shaped base paper forming the intermediate layer is smaller than the value of the water absorption of the easily-absorbing surface of the opposing band-shaped base paper, adhesion may be insufficient.
  • Base paper consists of pulp, filler, and various auxiliaries.
  • tableware use When the paper cylinder of the present invention is used for food and drink such as straws and muddlers and for use in contact with the mouth (hereinafter referred to as tableware use), it has been approved as a raw material as a food additive or has been FDA certified For example, it is preferable to use one that is compatible with food safety.
  • NNKP bleached kraft pulp of softwood
  • NUKP unbleached kraft pulp of softwood
  • LLKP bleached kraft pulp of hardwood
  • LKP unbleached kraft pulp of hardwood
  • SP sulfite pulp
  • Known pulp can be appropriately blended and used.
  • a chemical pulp such as LBKP or NBKP which is unlikely to cause contamination is preferably used, and a small amount of waste paper pulp is preferably used.
  • the compounding amount of the chemical pulp is preferably 80% or more, and the compounding amount of the chemical pulp is particularly preferably 100%.
  • fillers talc, kaolin, calcined kaolin, clay, heavy calcium carbonate, light calcium carbonate, white carbon, zeolite, magnesium carbonate, barium carbonate, titanium dioxide, zinc oxide, silicon oxide, amorphous silica, aluminum hydroxide
  • inorganic fillers such as calcium hydroxide, magnesium hydroxide, zinc hydroxide, barium sulfate, calcium sulfate, and organic fillers such as urea-formalin resin, polystyrene resin, phenolic resin, and fine hollow particles.
  • the filler is not an essential material and need not be used.
  • auxiliaries include rosin, an alkyl ketene dimer (AKD), an internal sizing agent such as alkenyl succinic anhydride (ASA), a polyacrylamide polymer, a polyvinyl alcohol polymer, a cationized starch, various modified starches, Dry paper strength agents such as urea / formalin resin and melamine / formalin resin, wet paper strength agents such as polyamide polyamine epichlorohydrin resin, polyamine epichlorohydrin resin, polyamide epichlorohydrin resin, polyvinylamine resin, polyethyleneimine resin, retention agent, and filtration
  • Aqueous improvers, coagulants, sulfuric acid bands, bulking agents, dyes, fluorescent brighteners, pH adjusters, defoamers, UV inhibitors, anti-fading agents, pitch control agents, slime control agents, etc. can be exemplified. Can be selected and used as needed
  • the method of producing the base paper (papermaking) and the type of the papermaking machine are not particularly limited, and the fourdrinier paper machine, the twin wire paper machine, the circular net paper machine, the gap former, the hybrid former (on-top former). And other known production (papermaking) methods and papermaking machines can be selected.
  • the pH during papermaking may be any of an acidic region (acidic papermaking), a pseudo-neutral region (pseudo-neutral papermaking), a neutral region (neutral papermaking), and an alkaline region (alkaline papermaking). Thereafter, an alkaline agent may be applied to the surface of the paper layer.
  • the basis weight of the base paper is preferably 30 g / m 2 or more and 200 g / m 2 or less from the viewpoint of forming a rigid paper cylinder.
  • the basis weight of the base paper forming each of the inner layer, the outer layer, and the intermediate layer may be the same or may be different, but in order to achieve both strength and winding workability of the paper cylinder, the basis weight of the outer layer is:
  • the weight is preferably not more than the basis weight of the inner layer and the intermediate layer.
  • the basis weight of the base paper forming the outer layer is preferably 30 g / m 2 or more and 150 g / m 2 or less.
  • the basis weight of the base paper for forming the outer layer exceeds 150 g / m 2 , the rigidity is increased and the winding processability may be reduced.
  • the basis weight of the base paper forming the inner layer or the intermediate layer is preferably from 60 g / m 2 to 200 g / m 2 .
  • ⁇ Coating liquid> One side of the base paper is coated with a coating solution containing a water-absorbing agent, and the other surface is coated with a coating solution containing no water-absorbing agent, or is not coated with a coating solution, or both sides
  • Low water absorption surface and easy water absorption by applying a coating liquid containing a water absorption adjustment agent with a different composition of the water absorption adjustment agent, or by applying a coating solution containing a water absorption adjustment agent whose effects on water absorption are opposite to each other.
  • a base paper for a paper cylinder having a surface can be obtained.
  • the water absorption adjusting agent those which increase or decrease the water absorption can be used without particular limitation, and examples thereof include an external sizing agent and a hydrophilic surfactant.
  • the coating solution containing the external sizing agent may be rosin, alkyl ketene dimer (AKD), alkenyl succinic anhydride (ASA), styrene-maleic acid copolymer, styrene-acrylic acid copolymer And various sizing agents such as olefins can be used without particular limitation.
  • the externally added sizing agent concentration of the coating liquid can be appropriately adjusted depending on the coating method.
  • the coating amount of the external sizing agent is preferably 0.01 g / m 2 or more and 1.0 g / m 2 or less.
  • starch and oxidized starch obtained from potato, sweet potato, corn, tapioca, wheat, etc., phosphated starch, urea phosphated starch, hydroxyethyl Water-soluble polymers commonly used as surface treatment agents such as modified starch, etherified starch, enzyme-modified starch, cationized starch, and other modified starches, carboxymethylcellulose, polyacrylamide, polyvinyl alcohol, and modified polyvinyl alcohol; An intended dry paper strength agent, wet paper strength agent and the like can be included. On the surface (size surface) to which the coating liquid containing the external sizing agent has been applied, the value of the water absorption decreases as compared to before the application. In addition, a coating liquid containing no external sizing agent or a surface on which coating is not performed (non-size surface) has a greater water absorption value than a size surface.
  • the coating liquid containing a hydrophilic surfactant can use, as the hydrophilic surfactant, a surfactant having an HLB value of more than 8 by the Griffin method without particular limitation.
  • the hydrophilic surfactant having an HLB value of more than 8 can be uniformly applied as an aqueous dispersion or an aqueous solution.
  • the hydrophilic surfactant concentration of coating solution can be suitably adjusted by coating method, the coating amount of the hydrophilic surfactant, 0.005 g / m 2 or more 1.0 g / m 2 or less Preferably, there is.
  • the coating liquid includes starch and oxidized starch obtained from potato, sweet potato, corn, tapioca, wheat, etc., phosphated starch, urea phosphated starch, hydroxy Water-soluble polymers commonly used as surface treatment agents such as modified starches such as ethylated starch, etherified starch, enzyme-modified starch, and cationized starch, carboxymethylcellulose, polyacrylamide, polyvinyl alcohol, and modified polyvinyl alcohol, and improved strength And a wet paper strength enhancer for the purpose of the present invention.
  • the surface to which the coating liquid containing a hydrophilic surfactant is applied has an increased water absorption value as compared to before the application.
  • the belt-shaped base paper of the present invention has a low water absorption surface on one side, an easy water absorption surface on the other side, and a coating liquid containing a water absorption adjusting agent such as an external sizing agent or a hydrophilic surfactant on one surface.
  • a coating liquid containing a water absorption adjusting agent such as an external sizing agent or a hydrophilic surfactant on one surface.
  • the coating method is not particularly limited as long as it can apply a coating liquid containing a water-absorbing agent, and the other surface does not contain the water-absorbing agent, the composition of the water-absorbing agent is different, A coating solution containing a water-absorbing agent, whose action is opposite to that described above, may be applied or may not be applied.
  • the coating device it is preferable to use a known size press device such as a gate roll coater, a rod metering size press, a blade metering size press, a bill blade coater, and a vervapa coater, and it is possible to continuously produce a base paper for a paper cylinder. It is particularly preferable to use an on-machine type size press installed in a papermaking line because of its excellent production efficiency. Furthermore, by cutting the base paper for a paper cylinder into a predetermined width, the belt-shaped base paper used in the present invention can be manufactured.
  • the paper cylinder of the present invention is formed by bonding each layer with an adhesive.
  • a known adhesive can be used without particular limitation.
  • a vinyl acetate-based, polyvinyl alcohol-based, starch-based, acrylic-based, epoxy-based adhesive, or the like can be used.
  • a water-soluble or water-dispersible adhesive containing a water-based emulsion is preferable since it has a small environmental load during production and can be used safely for tableware.
  • an adhesive that is biodegradable is preferable because it has a small impact on the environment.
  • the paper cylinder of the present invention can be manufactured by a known method. That is, the paper cylinder of the present invention can be manufactured by cutting the paperboard for a paper cylinder into a band-shaped base paper, and attaching the band-shaped base paper with an adhesive while spirally winding the band-shaped base paper around a mandrel (iron core). The adhesive can be applied to one side or both sides of the band base paper before the roll base paper is fed out and wound around a mandrel.
  • Example 1 The basis weight of 80 g / m 2 base paper of one side oxidized starch (Nihon Cornstarch Corporation SK100) was prepared coating was easily water surface at 2.1 g / m 2. In addition, the water absorption of the easily water-absorbing surface by the Cobb method (contact time 30 seconds) specified in JIS P8140 was 24.3 g / m 2 .
  • oxidized starch SK100, Nippon Cornstarch Co., Ltd.
  • a styrene acryl sizing agent PROGLUTIN A288, Kurita Water Industries, Ltd.
  • the first band-shaped base paper was spirally wound around a mandrel having a diameter of 6 mm so that the low water-absorbing surface was inside to form an inner layer.
  • a second strip-shaped sheet of the easily water surface polyvinyl acetate-based adhesive (NICHIEI Kako Co., Ltd. AV-650Y-6L) a coating weight 7 g / m 2, the easily water surface as an inner over the inner layer
  • the outer layer was formed by spirally winding to obtain a paper cylinder.
  • Example 2 A paper tube base paper was obtained in the same manner as in Example 1, except that the styrene acrylic sizing agent having a low water absorption surface was an AKD sizing agent (SEIKO PMC SE2366) and the coating amount was 2.5 g / m 2 . .
  • the water absorbency of the low water absorption surface of the base paper for a paper cylinder by the Cobb method (contact time: 30 seconds) specified in JIS P8140 was 16.7 g / m 2 .
  • a paper cylinder was obtained in the same manner as in Example 1.
  • Example 3 A base paper for a paper cylinder was obtained in the same manner as in Example 1, except that the oxidized starch having a low water absorption surface was ethylene-modified polyvinyl alcohol (Exeval RS4104, Kuraray Co., Ltd.) and the coating amount was 2.6 g / m 2 .
  • the water absorption of the low water absorption surface of this paperboard base paper by the Cobb method (contact time 30 seconds) specified in JIS P8140 was 14.8 g / m 2 .
  • a paper cylinder was obtained in the same manner as in Example 1.
  • Example 4 Except that the oxidized starch on the low water absorption surface was ethylene-modified polyvinyl alcohol (Exeval RS4104, Kuraray Co., Ltd.), the styrene acrylic sizing agent was AKD sizing agent (SEIKO PMC SE2366), and the coating amount was 2.7 g / m 2.
  • a paper cylinder base paper was obtained.
  • the water absorption of the low water absorption surface of the base paper for paper cylinder by the Cobb method (contact time 30 seconds) specified in JIS P8140 was 13.6 g / m 2 .
  • a paper cylinder was obtained in the same manner as in Example 1.
  • Example 5" A surface-active agent (Nissin Chemical Industries, Ltd.) has a basis weight of 110 g / m 2 and a water absorption of 16.3 g / m 2 on both sides according to the Cobb method (contact time 30 seconds) specified in JIS P8140. Co., Ltd., Surfynol 465) was applied at a coating amount of 0.02 g / m 2 to give an easily water-absorbing surface to obtain a base paper for a paper cylinder. The water absorption of the easily water-absorbing surface measured by the Cobb method (contact time: 30 seconds) specified in JIS P8140 was 28.1 g / m 2 .
  • Example 6 A base paper for a cylinder was obtained in the same manner as in Example 5, except that a base paper having a basis weight of 60 g / m 2 was used. Easy water surface is coated surface, water absorption by the non-coated is cumene Cobb method specified in JIS P8140 of the low water surface (contact time 30 seconds), respectively 29.9g / m 2, 16.2g / m 2 Met. Using this base paper for a paper cylinder, a paper cylinder was obtained in the same manner as in Example 1.
  • FIG. 2 shows a schematic diagram of the water resistance test 2.
  • the base paper for each paper cylinder made in the above example was cut into two strips of 5 cm ⁇ 20 cm, and the same polyvinyl acetate adhesive as used in the preparation of the paper cylinder was applied to one base paper on the easily water-absorbing side of the base paper. Using a bar, coating was carried out so as to obtain a solid content of 30 g / m 2 except for an area 3 cm from the short side end. Next, the other water-absorbing surface side of the base paper was adhered to the coated surface of the adhesive and dried overnight to obtain a test piece.
  • one base paper is fixed to a wire with a clip, and a 100 g weight is fixed to the short side end of the other base paper with a clip.
  • the entire test piece was immersed so that the weight did not contact the bottom of the container.
  • the time until the adhesive surface of the test piece was peeled off 5 cm from the end side where the weight was fixed was measured. Table 1 shows the results.
  • the paper cylinder base papers manufactured in Examples 1 to 6 required 5 minutes or more to peel off 5 cm under a load of 100 g / 5 cm width, and had good water resistance.

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  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
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Abstract

The present invention addresses the problem of providing a paper tube which places a small burden on the environment and has excellent water resistance. As a solution, provided is a paper tube comprising an inner layer formed of a spirally wound first band-shaped base paper, and an outer layer formed of a spirally wound second band-shaped base paper. The first and the second band-shaped base papers are provided with a low water-absorbent surface and a readily water-absorbent surface. The paper tube has an inner surface formed of the low water-absorbent surface of the first band-shaped base paper, and an outer surface formed of the low water-absorbent surface of the second band-shaped base paper.

Description

紙筒Paper cylinder
　本発明は、紙筒、特に耐水性に優れた紙筒に関する。 The present invention relates to a paper cylinder, particularly a paper cylinder excellent in water resistance.
　プラスチックは、安価で成形が容易なため、様々な製品の材料として広く用いられており、年間３億トン以上のプラスチック製品が生産されている。
　プラスチック製品の多くは、適切に処分されているが、その一部は、管理不十分や不法投棄により、環境中にごみとして流出してしまい、最終的に海に到達する。海洋中に流出するプラスチックごみの量は、年間８００万トン以上にのぼると推測されている。これらのプラスチックごみの多くは非生分解性であるため、そのほとんどが海洋中に蓄積され、２０５０年には、海洋中のプラスチック総量は魚類の総量（重量ベース）を上回ると予測されている。 Plastic is widely used as a material for various products because of its low cost and easy molding, and more than 300 million tons of plastic products are produced annually.
Many plastic products are disposed of properly, but some of them end up in the environment as garbage due to poor management or illegal dumping, and eventually reach the sea. The amount of plastic waste flowing into the ocean is estimated to be more than 8 million tons per year. Because many of these plastic wastes are non-biodegradable, most of them accumulate in the ocean, and by 2050 the total amount of plastic in the ocean is expected to exceed the total amount of fish (by weight).
　プラスチックごみによる環境破壊を防ぐための動きが始まっており、プラスチック製使い捨て製品を、環境への負荷が小さい材料で代替することが求められている。中でもプラスチック製のストローは、１日に米国で５億本、世界で１０億本以上が消費されているが、海鳥や海亀の誤飲による死亡例が報告されており、環境保護団体等が、プラスチック製ストローを使用しないように呼びかける運動を始めている。 動 き Movements to prevent environmental destruction due to plastic waste have begun, and it is required to replace plastic disposable products with materials that have less environmental impact. Among them, 500 million plastic straws are consumed daily in the United States and more than 1 billion worldwide, but deaths from accidental ingestion of seabirds and sea turtles have been reported. , Has begun a campaign to avoid using plastic straws.
　プラスチック製ストローの、環境への負荷が小さい代替材料としては、生分解性プラスチックと並んで紙が注目されており、例えば、特許文献１、２には、紙製のストローが提案されている。 紙 Paper is attracting attention as an alternative material to plastic straws that has less impact on the environment, along with biodegradable plastics. For example, Patent Documents 1 and 2 propose paper straws.
特開平６－１３３８４０号公報JP-A-6-133840 特開２００９－２３３３４８号公報JP 2009-233348 A
　環境への負荷が小さく、かつ、耐水性に優れた紙筒を提供することを課題とする。 を It is an object of the present invention to provide a paper cylinder having a small environmental load and excellent water resistance.
　本発明の課題を解決するための手段は、以下の通りである。
１．第一の帯状原紙が螺旋状に巻回されてなる内層と、第二の帯状原紙が螺旋状に巻回されてなる外層とを有し、
　前記第一および第二の帯状原紙が低吸水面と易吸水面とを備え、
　内面が前記第一の帯状原紙の低吸水面、外面が前記第二の帯状原紙の低吸水面から形成されていることを特徴とする紙筒。
２．前記第一の帯状原紙と前記第二の帯状原紙とが、接着剤で接着されていることを特徴とする１．に記載の紙筒。
３．内層と外層との間に、第三の帯状原紙が螺旋状に巻回されてなる中間層を有し、
　前記第三の帯状原紙が、両面が易吸水面であり、各層間が接着剤で接着されていることを特徴とする１．に記載の紙筒。
４．前記第一の帯状原紙の低吸水面、第二の帯状原紙の低吸水面のいずれか、または両方が、外添サイズ剤が塗工されていることを特徴とする１．～３．のいずれかに記載の紙筒。
５．前記第一の帯状原紙の易吸水面、第二の帯状原紙の易吸水面のいずれか、または両方が、親水性界面活性剤が塗工されていることを特徴とする１．～３．のいずれかに記載の紙筒。 Means for solving the problems of the present invention are as follows.
1. The first band-shaped base paper has an inner layer that is spirally wound, and the second band-shaped base paper has an outer layer that is spirally wound,
The first and second band-shaped base papers have a low water absorption surface and an easy water absorption surface,
A paper cylinder characterized in that an inner surface is formed by a low water absorption surface of the first band base paper and an outer surface is formed by a low water absorption surface of the second band base paper.
2. The first strip-shaped base paper and the second strip-shaped base paper are bonded with an adhesive. Paper cylinder according to the above.
3. Between the inner layer and the outer layer, the third belt-shaped base paper has an intermediate layer that is spirally wound,
The third belt-shaped base paper is characterized in that both surfaces are easily water-absorbing surfaces and each layer is adhered with an adhesive. Paper cylinder according to the above.
4. One or both of the low water absorption surface of the first band base paper and the low water absorption surface of the second band base paper are coated with an external sizing agent. ~ 3. A paper cylinder according to any one of the above.
5. Either one or both of the easily absorbable surface of the first strip base paper and the easily absorbable surface of the second strip base paper are coated with a hydrophilic surfactant. ~ 3. A paper cylinder according to any one of the above.
　本発明の紙筒は、紙を主体としており、環境への負荷が小さい。本発明で使用する低吸水面と易吸水面とを備える帯状原紙は、抄紙ラインに設置されているオンマシンタイプのサイズプレス装置を用いて連続的に製造することができるため、生産性が高く、低コストである。また、本発明の紙筒は、紙を主体とするが耐水性に優れており、水と接触する用途で使用される紙筒に好適に利用することができる。 紙 The paper cylinder of the present invention is mainly made of paper and has a small environmental load. The band-shaped base paper having the low water absorption surface and the easy water absorption surface used in the present invention can be continuously produced by using an on-machine type size press installed in a papermaking line, so that productivity is high. , Low cost. Further, the paper cylinder of the present invention is mainly made of paper, but has excellent water resistance, and can be suitably used for a paper cylinder used in applications that come into contact with water.
本発明の一実施態様である紙筒の部分分解図。FIG. 2 is a partially exploded view of a paper cylinder as one embodiment of the present invention. 耐水性試験２の模式図。The schematic diagram of the water resistance test 2.
１　　　紙筒
１１　　内層
１１０　第一の帯状原紙
１１１　第一の帯状原紙の低吸水面
１１２　第一の帯状原紙の易吸水面
１２　　外層
１２０　第二の帯状原紙
１２１　第二の帯状原紙の低吸水面
１２２　第二の帯状原紙の易吸水面 REFERENCE SIGNS LIST 1 paper cylinder 11 inner layer 110 first band base paper 111 low water absorption surface 112 of first band base paper 112 easy water absorption surface of first band base paper 12 outer layer 120 second band base paper 121 low water absorption surface 122 of second band base paper Easy water absorption surface of the second band base paper
　＜紙筒＞
　本発明の紙筒は、第一の帯状原紙が螺旋状に巻回されてなる内層と、第二の帯状原紙が螺旋状に巻回されてなる外層とを有する。本発明の紙筒に使用する第一および第二の帯状原紙は、低吸水面と易吸水面とを備えており、紙筒の内面が第一の帯状原紙の低吸水面、紙筒の外面が第二の帯状原紙の低吸水面から形成されている。 <Paper cylinder>
The paper cylinder of the present invention has an inner layer formed by spirally winding a first strip-shaped base paper, and an outer layer formed by spirally winding a second strip-shaped base paper. The first and second band base papers used for the paper cylinder of the present invention have a low water absorption surface and an easy water absorption surface, and the inner surface of the paper cylinder has a low water absorption surface of the first band base paper and the outer surface of the paper cylinder. Are formed from the low water-absorbing surface of the second strip base paper.
　本発明の一実施態様である紙筒の部分分解図を、図１に示す。
　一実施態様である紙筒１は、内層１１と外層１２とを有し、内層１１は第一の帯状原紙１１０が螺旋状に巻回されてなり、外層１２は第二の帯状原紙１２０が螺旋状に巻回されてなる。第一の帯状原紙１１０は低吸水面１１１と易吸水面１１２を、第二の帯状原紙１２０は低吸水面１２１と易吸水面１２２を備えている。紙筒１は、その内面が第一の帯状原紙１１０の低吸水面１１１、外面が第二の帯状原紙１２０の低吸水面１２１から形成されている。また、第一の帯状原紙１１０の易吸水面１１２と、第二の帯状原紙１２０の易吸水面１２２とは、接着剤（図示せず）により、貼り合わされている。 FIG. 1 is a partially exploded view of a paper cylinder according to an embodiment of the present invention.
The paper cylinder 1 according to one embodiment has an inner layer 11 and an outer layer 12. The inner layer 11 is formed by spirally winding a first strip-shaped base paper 110, and the outer layer 12 is formed by spirally winding a second strip-shaped base paper 120. It is wound in a shape. The first belt-shaped base paper 110 has a low water absorption surface 111 and an easy water absorption surface 112, and the second belt base paper 120 has a low water absorption surface 121 and an easy water absorption surface 122. The inner surface of the paper cylinder 1 is formed by the low water absorption surface 111 of the first band base paper 110, and the outer surface thereof is formed by the low water absorption surface 121 of the second band base paper 120. The easily water-absorbing surface 112 of the first band-shaped base paper 110 and the easily water-absorbing surface 122 of the second band-shaped base paper 120 are bonded to each other with an adhesive (not shown).
　本発明の紙筒は、少なくとも内層と外層を有していればよく、内層と外層に加えて１層以上の中間層を有する３層以上の構成とすることもできる。ただし、層数が多くなると、製造工程が煩雑となる、高コストとなる、欠陥が発生しやすくなる、といった問題があるため、内層と外層の２層、または、両面が易吸水面である第三の帯状原紙が螺旋状に巻回されてなる１層の中間層を加えた３層であることが好ましい。 紙 The paper cylinder of the present invention may have at least an inner layer and an outer layer, and may have a configuration of three or more layers having one or more intermediate layers in addition to the inner layer and the outer layer. However, when the number of layers is large, there are problems that the manufacturing process becomes complicated, the cost becomes high, and defects are easily generated. Therefore, the two layers of the inner layer and the outer layer, or both surfaces are easily water-absorbing surfaces. It is preferable to have three layers including one intermediate layer formed by spirally winding three strip-shaped base papers.
　本発明で使用する第一及び第二の帯状原紙は、低吸水面と易吸水面とを備えている。１層以上の中間層を有する場合は、中間層を形成するための１枚以上の帯状原紙は、両面が易吸水面である。そのため、本発明の紙筒は、水と馴染みやすい易吸水面同士が接着剤で貼り合わされているため、各層が強固に接着している。また、本発明の紙筒は、液体と直接接触する紙筒の内面と外面とが、第一および第二の帯状原紙の低吸水面から形成されているため、耐水性に優れている。
　本発明の紙筒は、各層間での剥離が生じにくく、耐水性に優れているため、水と接触する用途に利用することができ、例えば、ストロー、マドラー等として好適に利用することができる。 The first and second strip base papers used in the present invention have a low water absorption surface and an easy water absorption surface. In the case of having one or more intermediate layers, at least one strip-shaped base paper for forming the intermediate layer has an easily water-absorbing surface on both sides. Therefore, in the paper cylinder of the present invention, the easily water-absorbing surfaces that are easily compatible with water are adhered to each other with an adhesive, so that the respective layers are firmly adhered to each other. Further, the paper tube of the present invention is excellent in water resistance because the inner surface and the outer surface of the paper tube that are in direct contact with the liquid are formed from the low water absorbing surfaces of the first and second strip-shaped base papers.
The paper cylinder of the present invention hardly causes peeling between the layers and has excellent water resistance, so that it can be used for applications that come into contact with water, and can be suitably used as, for example, straws and muddlers. .
　帯状原紙を螺旋状に巻回して紙筒の一層を形成するに際し、紙筒長さ方向における重複幅（図１におけるｄ１、ｄ２）が狭いほうが段差の小さな紙筒を形成できる点から好ましい。具体的には、重複幅は、２ｍｍ以下であることが好ましく、１ｍｍ以下であることがより好ましく、０．５ｍｍ以下であることがさらに好ましい。
　ここで、紙筒の一層を、２本以上の帯状原紙で形成することは、１本の帯状原紙を螺旋状に巻回して形成した紙筒において、帯状原紙を長さ方向に沿って２本以上に切断したことと同義であり、本発明の技術的思想の範囲内である。 When spirally winding the belt-shaped base paper to form a single layer of the paper cylinder, it is preferable that the overlap width (d1, d2 in FIG. 1) in the length direction of the paper cylinder is narrow because a paper cylinder with a small step can be formed. Specifically, the overlap width is preferably 2 mm or less, more preferably 1 mm or less, and even more preferably 0.5 mm or less.
Here, forming one layer of the paper cylinder with two or more belt-shaped base papers means that, in a paper cylinder formed by spirally winding one belt-shaped base paper, two belt-shaped base papers are formed along the length direction. This is synonymous with the above cutting and is within the technical idea of the present invention.
　本発明の紙筒において、各層の巻き方向は、同一方向（Ｓ巻き、または、Ｚ巻き）であってもよく、異なる方向であってもよい。ただし、隣接する層を異なる方向（Ｓ巻きとＺ巻き）に巻回すと、ある層を形成する帯状原紙の幅方向の接合部と、隣接する層を形成する帯状原紙の幅方向の接合部とが周期的に重複し、この重複部分に隙間が生じやすくなるため、同一方向に巻回すことが好ましい。 に お い て In the paper cylinder of the present invention, the winding direction of each layer may be the same direction (S winding or Z winding) or may be different directions. However, when the adjacent layers are wound in different directions (S winding and Z winding), the joining portion in the width direction of the strip-shaped base paper forming a certain layer and the joining portion in the width direction of the strip-shaped base paper forming the adjacent layer are formed. Are periodically overlapped, and a gap is likely to be formed in the overlapped portion. Therefore, it is preferable to wind in the same direction.
　帯状原紙を同一方向に巻く場合は、隣接する層を形成する帯状原紙の幅方向の接合部が重複しないように、各層を形成する帯状原紙が、紙筒の軸方向に対して同一角度で、帯幅方向にずれた状態で巻回されていることが好ましい。隣接する層を形成する帯状原紙の紙筒長さ方向のずれ幅（図１におけるＤ）は、帯状原紙の紙筒長さ方向幅の１０％以上であることが好ましい。帯状原紙の紙筒長さ方向幅の１０％以上ずらして巻回して貼り合わせることにより、強固に一体化した紙筒を製造することができる。ずれ幅は、帯状原紙の紙筒長さ方向幅の２５％以上であることがより好ましく、４０％以上であることがさらに好ましく、５０％であることが最も好ましい。なお、ずれ幅の最大値は、帯状原紙の紙筒長さ方向幅の５０％である。 When winding the strip-shaped base paper in the same direction, the strip-shaped base paper forming each layer is formed at the same angle with respect to the axial direction of the paper cylinder so that the joining portions in the width direction of the strip-shaped base paper forming the adjacent layers do not overlap. It is preferable to be wound in a state shifted in the band width direction. It is preferable that the shift width (D in FIG. 1) of the strip-shaped base paper forming the adjacent layer be 10% or more of the width of the strip-shaped base paper in the roll-tube length. By winding and laminating the band-shaped base paper by shifting it by 10% or more in the lengthwise direction of the paper cylinder, a strongly integrated paper cylinder can be manufactured. The shift width is more preferably 25% or more, more preferably 40% or more, and most preferably 50% of the width of the belt-shaped base paper in the lengthwise direction of the paper cylinder. Note that the maximum value of the deviation width is 50% of the width of the belt-shaped base paper in the length direction of the paper cylinder.
　本発明の紙筒の直径は特に制限されず、その用途に応じて様々な直径とすることができる。例えば、本発明の紙筒は耐水性に優れているため、内径３ｍｍ以上１５ｍｍ以下の紙筒を、紙製ストローとして好適に利用することができる。 直径 The diameter of the paper cylinder of the present invention is not particularly limited, and can be various diameters according to the use. For example, since the paper cylinder of the present invention is excellent in water resistance, a paper cylinder having an inner diameter of 3 mm or more and 15 mm or less can be suitably used as a paper straw.
　＜帯状原紙・紙筒用原紙＞
　本発明において、帯状原紙は、紙筒用原紙を所定の幅に裁断し、帯状とすることにより製造される。帯状原紙の幅は特に制限されず、製造する紙筒の径に応じて適宜調整することができるが、通常、８ｍｍ以上４０ｍｍ以下程度である。
　第一および第二の帯状原紙を形成するための紙筒用原紙は、低吸水面と易吸水面とを備えている。本発明で使用する低吸水面と易吸水面とを備える紙筒用原紙は、その両面で吸水量が異なる原紙を特に制限することなく使用することができ、例えば、基紙の片面に外添サイズ剤や親水性界面活性剤等の吸水性を調整する目的で配合する薬剤（以下、吸水性調整薬剤ともいう。）を含む塗工液を塗工する等により製造することができる。この際、基紙の他面には、吸水性調整薬剤を含まない塗工液、吸水性調整薬剤の濃度が異なる塗工液、または片面に塗布した吸水性調整薬剤とは吸水性への作用が相反する吸水性調整薬剤を含む塗工液を塗工することができ、または、塗工を行わなくてもよい。また、第一の帯状原紙となる紙筒用原紙と第二の帯状原紙となる紙筒用原紙において、低吸水面または易吸水面を形成するための塗工等の処理は、同一であってもよく、異なっていてもよい。なお、吸水性への作用が相反する吸水性調整薬剤とは、片面（裏面）に塗布した吸水性調整薬剤と吸水性に関して逆の働きをする薬剤を意味し、例えば、片面に吸水度の値を大きくする薬剤が塗布された場合、吸水度の値を小さくする薬剤のことである。 <Base paper and paper cylinder base paper>
In the present invention, the band-shaped base paper is manufactured by cutting a paper tube base paper into a predetermined width to form a band. The width of the band-shaped base paper is not particularly limited and can be appropriately adjusted depending on the diameter of the paper cylinder to be manufactured, but is usually about 8 mm or more and about 40 mm or less.
A paper cylinder base paper for forming the first and second belt-shaped base papers has a low water absorption surface and an easy water absorption surface. The base paper for paper cylinders having a low water absorption surface and an easy water absorption surface used in the present invention can be used without particular limitation for base papers having different water absorption amounts on both surfaces. It can be produced by applying a coating liquid containing a drug (hereinafter, also referred to as a water-absorbing agent) to be mixed for the purpose of adjusting the water absorption such as a sizing agent or a hydrophilic surfactant. At this time, the other side of the base paper is coated with a water-absorbing agent-free coating solution, a coating solution having a different concentration of the water-absorbing agent, or a water-absorbing agent coated on one side. Can be applied with a coating liquid containing a water-absorbing agent that is contradictory, or the coating does not have to be performed. In addition, in the base paper for a cylinder serving as the first band base paper and the base paper for a cylinder serving as the second band base paper, processes such as coating for forming a low water absorption surface or an easy water absorption surface are the same. And may be different. In addition, the water-absorbing control agent whose action on water-absorbing property is opposite means a water-absorbing control agent applied on one side (rear surface) and a drug that has the opposite function with respect to water absorption. Is applied when an agent for increasing the water absorption is applied.
　本発明において、低吸水面の、ＪＩＳ　Ｐ８１４０に規定されるコッブ法（接触時間３０秒）により得られる吸水度の値は、２０ｇ／ｍ２以下であることが好ましく、１５ｇ／ｍ２以下であることがより好ましく、１２ｇ／ｍ２以下であることがさらに好ましい。
　また、易吸水面は、低吸水面のＪＩＳ　Ｐ８１４０に規定されるコッブ法（接触時間３０秒）により得られる吸水度よりも、吸水度が大きければよく、１ｇ／ｍ２以上大きいことが好ましく、３ｇ／ｍ２以上大きいことがより好ましく、５ｇ／ｍ２以上大きいことがさらに好ましい。 In the present invention, the value of the water absorption of the low water absorption surface obtained by the Cobb method (contact time 30 seconds) specified in JIS P8140 is preferably 20 g / m 2 or less, and more preferably 15 g / m 2 or less. More preferably, it is more preferably 12 g / m 2 or less.
Further, the easily water-absorbing surface should have a higher water-absorbing degree than the low-water-absorbing surface obtained by the Cobb method (contact time 30 seconds) specified in JIS P8140, and preferably 1 g / m 2 or more. More preferably 3 g / m 2 or more, even more preferably 5 g / m 2 or more.
　中間層を形成するために両面が易吸水面である帯状原紙を用いる場合、この帯状原紙の各面のＪＩＳ　Ｐ８１４０に規定されるコッブ法（接触時間３０秒）により得られる吸水度の値は、貼合される帯状原紙の易吸水面の吸水度の値と同じか、または大きいことが好ましい。中間層を形成する帯状原紙の吸水度の値が、対向する帯状原紙の易吸水面の吸水度の値より小さいと接着が不十分になる場合がある。 When a band-shaped base paper having both surfaces which are easily water-absorbing is used to form the intermediate layer, the water absorption value of each side of the band-shaped base paper obtained by the Cobb method (contact time 30 seconds) specified in JIS P8140 is: It is preferable that the value is equal to or greater than the value of the water absorption of the easily water-absorbing surface of the band-shaped base paper to be bonded. If the value of the water absorption of the band-shaped base paper forming the intermediate layer is smaller than the value of the water absorption of the easily-absorbing surface of the opposing band-shaped base paper, adhesion may be insufficient.
・基紙
　基紙は、パルプ、填料、各種助剤等からなる。
　本発明の紙筒を、ストローやマドラー等の飲食品や口に接触する用途（以下、食器用途という）に使用する場合、原料として、食品添加物として認可を受けている、またはＦＤＡ認証取得済み等、食品安全性に適合したものを使用することが好ましい。 ・ Base paper Base paper consists of pulp, filler, and various auxiliaries.
When the paper cylinder of the present invention is used for food and drink such as straws and muddlers and for use in contact with the mouth (hereinafter referred to as tableware use), it has been approved as a raw material as a food additive or has been FDA certified For example, it is preferable to use one that is compatible with food safety.
　パルプとしては、針葉樹の晒クラフトパルプ（ＮＢＫＰ）、針葉樹の未晒クラフトパルプ（ＮＵＫＰ）、広葉樹の晒クラフトパルプ（ＬＢＫＰ）、広葉樹の未晒クラフトパルプ（ＬＵＫＰ）、サルファイトパルプ（ＳＰ）等の木材の化学パルプ、グランドパルプ（ＧＰ）、リファイナーグランドパルプ（ＲＧＰ）、ストーングランドパルプ（ＳＧＰ）、ケミグランドパルプ（ＣＧＰ）、セミケミカルパルプ（ＳＣＰ）、サーモメカニカルパルプ（ＴＭＰ）、ケミサーモメカニカルパルプ（ＣＴＭＰ）等の木材の機械パルプ、ケナフ、バガス、竹、麻、ワラなどから得られた非木材パルプ、古紙を原料とし、脱墨工程にて古紙に含まれるインキを除去した古紙パルプなど、公知のパルプを適宜配合して用いることが可能である。
　ただし、本発明の紙筒を、食器用途に使用する場合、異物混入が発生し難いＬＢＫＰ、ＮＢＫＰ等の化学パルプが好ましく、また、古紙パルプの配合量が少ないことが好ましい。具体的には、化学パルプの配合量が８０％以上であることが好ましく、化学パルプの配合量が１００％であることが特に好ましい。 As the pulp, bleached kraft pulp of softwood (NBKP), unbleached kraft pulp of softwood (NUKP), bleached kraft pulp of hardwood (LBKP), unbleached kraft pulp of hardwood (LUKP), sulfite pulp (SP), etc. Wood chemical pulp, ground pulp (GP), refiner ground pulp (RGP), stone ground pulp (SGP), chemical ground pulp (CGP), semi-chemical pulp (SCP), thermomechanical pulp (TMP), chemithermo-mechanical pulp (CTMP) and other mechanical pulp of wood, non-wood pulp obtained from kenaf, bagasse, bamboo, hemp, straw, etc., waste paper pulp using waste paper as raw material and removing ink contained in waste paper in the deinking process, etc. Known pulp can be appropriately blended and used.
However, when the paper cylinder of the present invention is used for tableware, a chemical pulp such as LBKP or NBKP which is unlikely to cause contamination is preferably used, and a small amount of waste paper pulp is preferably used. Specifically, the compounding amount of the chemical pulp is preferably 80% or more, and the compounding amount of the chemical pulp is particularly preferably 100%.
　填料としては、タルク、カオリン、焼成カオリン、クレー、重質炭酸カルシウム、軽質炭酸カルシウム、ホワイトカーボン、ゼオライト、炭酸マグネシウム、炭酸バリウム、二酸化チタン、酸化亜鉛、酸化珪素、非晶質シリカ、水酸化アルミニウム、水酸化カルシウム、水酸化マグネシウム、水酸化亜鉛、硫酸バリウム、硫酸カルシウムなどの無機填料、尿素－ホルマリン樹脂、ポリスチレン樹脂、フェノール樹脂、微小中空粒子等の有機填料等の公知の填料を使用することができる。なお、填料は、必須材料ではなく、使用しなくてもよい。 As fillers, talc, kaolin, calcined kaolin, clay, heavy calcium carbonate, light calcium carbonate, white carbon, zeolite, magnesium carbonate, barium carbonate, titanium dioxide, zinc oxide, silicon oxide, amorphous silica, aluminum hydroxide Use known fillers such as inorganic fillers such as calcium hydroxide, magnesium hydroxide, zinc hydroxide, barium sulfate, calcium sulfate, and organic fillers such as urea-formalin resin, polystyrene resin, phenolic resin, and fine hollow particles. Can be. Note that the filler is not an essential material and need not be used.
　各種助剤としては、ロジン、アルキルケテンダイマー（ＡＫＤ）、アルケニルコハク酸無水物（ＡＳＡ）などの内添サイズ剤、ポリアクリルアミド系高分子、ポリビニルアルコール系高分子、カチオン化澱粉、各種変性澱粉、尿素・ホルマリン樹脂、メラミン・ホルマリン樹脂などの乾燥紙力増強剤、ポリアミドポリアミンエピクロルヒドリン樹脂、ポリアミンエピクロルヒドリン樹脂、ポリアミドエピクロルヒドリン樹脂、ポリビニルアミン樹脂、ポリエチレンイミン樹脂などの湿潤紙力増強剤、歩留剤、濾水性向上剤、凝結剤、硫酸バンド、嵩高剤、染料、蛍光増白剤、ｐＨ調整剤、消泡剤、紫外線防止剤、退色防止剤、ピッチコントロール剤、スライムコントロール剤等が例示可能であり、必要に応じて適宜選択して使用可能である。 Various auxiliaries include rosin, an alkyl ketene dimer (AKD), an internal sizing agent such as alkenyl succinic anhydride (ASA), a polyacrylamide polymer, a polyvinyl alcohol polymer, a cationized starch, various modified starches, Dry paper strength agents such as urea / formalin resin and melamine / formalin resin, wet paper strength agents such as polyamide polyamine epichlorohydrin resin, polyamine epichlorohydrin resin, polyamide epichlorohydrin resin, polyvinylamine resin, polyethyleneimine resin, retention agent, and filtration Aqueous improvers, coagulants, sulfuric acid bands, bulking agents, dyes, fluorescent brighteners, pH adjusters, defoamers, UV inhibitors, anti-fading agents, pitch control agents, slime control agents, etc. can be exemplified. Can be selected and used as needed
＜抄紙工程＞
　基紙の製造（抄紙）方法、抄紙機の型式は特に限定されるものではなく、長網抄紙機、ツインワイヤー抄紙機、円網抄紙機、ギャップフォーマー、ハイブリッドフォーマー(オントップフォーマー)等の公知の製造（抄紙）方法、抄紙機が選択可能である。
　また、抄紙時のｐＨは酸性領域（酸性抄紙）、疑似中性領域（疑似中性抄紙）、中性領域（中性抄紙）、アルカリ性領域（アルカリ性抄紙）のいずれでもよく、酸性領域で抄紙した後、紙層の表面にアルカリ性薬剤を塗布してもよい。 <Paper making process>
The method of producing the base paper (papermaking) and the type of the papermaking machine are not particularly limited, and the fourdrinier paper machine, the twin wire paper machine, the circular net paper machine, the gap former, the hybrid former (on-top former). And other known production (papermaking) methods and papermaking machines can be selected.
The pH during papermaking may be any of an acidic region (acidic papermaking), a pseudo-neutral region (pseudo-neutral papermaking), a neutral region (neutral papermaking), and an alkaline region (alkaline papermaking). Thereafter, an alkaline agent may be applied to the surface of the paper layer.
　基紙の坪量は、３０ｇ／ｍ２以上２００ｇ／ｍ２以下であることが、剛直な紙筒を形成する点から好ましい。内層、外層、中間層のそれぞれを形成する基紙の坪量は同じであってもよく、異なっていてもよいが、紙筒の強度と巻き加工性を両立するため、外層の坪量は、内層および中間層の坪量以下であることが好ましい。具体的には、外層を形成する基紙の坪量は、３０ｇ／ｍ２以上１５０ｇ／ｍ２以下であることが好ましい。外層を形成する基紙の坪量が１５０ｇ／ｍ２を越えると、剛度が高くなり、巻き加工性が低下する場合がある。内層または中間層を形成する基紙の坪量は６０ｇ／ｍ２以上２００ｇ／ｍ２以下であることが好ましい。 The basis weight of the base paper is preferably 30 g / m 2 or more and 200 g / m 2 or less from the viewpoint of forming a rigid paper cylinder. The basis weight of the base paper forming each of the inner layer, the outer layer, and the intermediate layer may be the same or may be different, but in order to achieve both strength and winding workability of the paper cylinder, the basis weight of the outer layer is: The weight is preferably not more than the basis weight of the inner layer and the intermediate layer. Specifically, the basis weight of the base paper forming the outer layer is preferably 30 g / m 2 or more and 150 g / m 2 or less. When the basis weight of the base paper for forming the outer layer exceeds 150 g / m 2 , the rigidity is increased and the winding processability may be reduced. The basis weight of the base paper forming the inner layer or the intermediate layer is preferably from 60 g / m 2 to 200 g / m 2 .
＜塗工液＞
　基紙の片面のみに吸水性調整薬剤を含む塗工液を塗工し、他面は吸水性調整薬剤を含まない塗工液を塗工する、あるいは塗工液を塗工しない、または、両面に吸水性調整薬剤の配合が異なる塗工液を塗工する、あるいは両面に吸水性への作用が相反する吸水性調整薬剤を含む塗工液を塗工することで、低吸水面と易吸水面を備える紙筒用原紙を得ることができる。吸水性調整薬剤としては、吸水度を大きくまたは小さくするものを特に制限することなく使用することができ、例えば、外添サイズ剤、親水性界面活性剤等が挙げられる。 <Coating liquid>
One side of the base paper is coated with a coating solution containing a water-absorbing agent, and the other surface is coated with a coating solution containing no water-absorbing agent, or is not coated with a coating solution, or both sides Low water absorption surface and easy water absorption by applying a coating liquid containing a water absorption adjustment agent with a different composition of the water absorption adjustment agent, or by applying a coating solution containing a water absorption adjustment agent whose effects on water absorption are opposite to each other. A base paper for a paper cylinder having a surface can be obtained. As the water absorption adjusting agent, those which increase or decrease the water absorption can be used without particular limitation, and examples thereof include an external sizing agent and a hydrophilic surfactant.
　外添サイズ剤を含む塗工液は、外添サイズ剤として、ロジン、アルキルケテンダイマー（ＡＫＤ）、アルケニルコハク酸無水物（ＡＳＡ）、スチレン―マレイン酸共重合体、スチレン―アクリル酸共重合体、オレフィン系などの各種サイズ剤を、特に制限することなく使用することができる。塗工液の外添サイズ剤濃度は、塗工方式によって適宜調整することができる。外添サイズ剤の塗工量は、０．０１ｇ／ｍ２以上１．０ｇ／ｍ２以下であることが好ましい。また、この塗工液には、外添サイズ剤以外にも、馬鈴薯、甘藷、コーン、タピオカ、小麦などから得られる澱粉および酸化澱粉、リン酸エステル化澱粉、尿素リン酸エステル化澱粉、ヒドロキシエチル化澱粉、エーテル化澱粉、酵素変性澱粉、カチオン化澱粉などの加工澱粉、カルボキシメチルセルロース、ポリアクリルアミド、ポリビニルアルコール、変性ポリビニルアルコール等の表面処理剤として通常使用される水溶性高分子や、強度向上を目的とした乾燥紙力増強剤、湿潤紙力増強剤などを含むことができる。外添サイズ剤を含む塗工液を塗布した面（サイズ面）は、塗工前と比較して吸水度の値が減少する。また、外添サイズ剤を含まない塗工液、または塗工を行わない面（非サイズ面）は、サイズ面と比較して吸水度の値が大きい。 The coating solution containing the external sizing agent may be rosin, alkyl ketene dimer (AKD), alkenyl succinic anhydride (ASA), styrene-maleic acid copolymer, styrene-acrylic acid copolymer And various sizing agents such as olefins can be used without particular limitation. The externally added sizing agent concentration of the coating liquid can be appropriately adjusted depending on the coating method. The coating amount of the external sizing agent is preferably 0.01 g / m 2 or more and 1.0 g / m 2 or less. In addition, in addition to the external sizing agent, starch and oxidized starch obtained from potato, sweet potato, corn, tapioca, wheat, etc., phosphated starch, urea phosphated starch, hydroxyethyl Water-soluble polymers commonly used as surface treatment agents such as modified starch, etherified starch, enzyme-modified starch, cationized starch, and other modified starches, carboxymethylcellulose, polyacrylamide, polyvinyl alcohol, and modified polyvinyl alcohol; An intended dry paper strength agent, wet paper strength agent and the like can be included. On the surface (size surface) to which the coating liquid containing the external sizing agent has been applied, the value of the water absorption decreases as compared to before the application. In addition, a coating liquid containing no external sizing agent or a surface on which coating is not performed (non-size surface) has a greater water absorption value than a size surface.
　親水性界面活性剤を含む塗工液は、親水性界面活性剤として、グリフィン法によるＨＬＢ値が８より大きな界面活性剤を特に制限することなく使用することができる。このＨＬＢ値が８より大きい親水性界面活性剤は、水分散液または水溶液として、均一に塗工することができる。塗工液の親水性界面活性剤濃度は、塗工方式によって適宜調整することができるが、親水性界面活性剤の塗工量は、０．００５ｇ／ｍ２以上１．０ｇ／ｍ２以下であることが好ましい。また、この塗工液には、親水性界面活性剤以外にも、馬鈴薯、甘藷、コーン、タピオカ、小麦などから得られる澱粉および酸化澱粉、リン酸エステル化澱粉、尿素リン酸エステル化澱粉、ヒドロキシエチル化澱粉、エーテル化澱粉、酵素変性澱粉、カチオン化澱粉などの加工澱粉、カルボキシメチルセルロース、ポリアクリルアミド、ポリビニルアルコール、変性ポリビニルアルコール等の表面処理剤として通常使用される水溶性高分子や、強度向上を目的とした乾燥紙力増強剤、湿潤紙力増強剤などを含むことができる。親水性界面活性剤を含む塗工液を塗布した面は、塗工前と比較して吸水度の値が増加する。 The coating liquid containing a hydrophilic surfactant can use, as the hydrophilic surfactant, a surfactant having an HLB value of more than 8 by the Griffin method without particular limitation. The hydrophilic surfactant having an HLB value of more than 8 can be uniformly applied as an aqueous dispersion or an aqueous solution. The hydrophilic surfactant concentration of coating solution can be suitably adjusted by coating method, the coating amount of the hydrophilic surfactant, 0.005 g / m 2 or more 1.0 g / m 2 or less Preferably, there is. In addition, in addition to the hydrophilic surfactant, the coating liquid includes starch and oxidized starch obtained from potato, sweet potato, corn, tapioca, wheat, etc., phosphated starch, urea phosphated starch, hydroxy Water-soluble polymers commonly used as surface treatment agents such as modified starches such as ethylated starch, etherified starch, enzyme-modified starch, and cationized starch, carboxymethylcellulose, polyacrylamide, polyvinyl alcohol, and modified polyvinyl alcohol, and improved strength And a wet paper strength enhancer for the purpose of the present invention. The surface to which the coating liquid containing a hydrophilic surfactant is applied has an increased water absorption value as compared to before the application.
＜加工工程＞
　本発明の帯状原紙は、片面が低吸水面、他面が易吸水面であり、一面に外添サイズ剤や親水性界面活性剤等の吸水性調整薬剤を含む塗工液を塗工することにより製造することができる。塗工方法は、吸水性調整薬剤を含む塗工液を塗工できる方法であれば特に制限されず、他面は、吸水性調整薬剤を含まない、吸水性調整薬剤の配合が異なる、吸水性への作用が相反する吸水性調整薬剤を含む塗工液を塗工してもよく、または、塗工を行わなくてもよい。塗工装置としては、ゲートロールコーター、ロッドメタリングサイズプレス、ブレードメタリングサイズプレス、ビルブレードコーター、ベルバパコーター等の公知のサイズプレス装置を用いることが好ましく、紙筒用原紙を連続生産することができ、生産効率に優れているため、抄紙ラインに設置されているオンマシンタイプのサイズプレス装置を用いることが特に好ましい。
　さらに、紙筒用原紙を所定の幅に裁断することにより、本発明で使用する帯状原紙を製造することができる。 <Processing process>
The belt-shaped base paper of the present invention has a low water absorption surface on one side, an easy water absorption surface on the other side, and a coating liquid containing a water absorption adjusting agent such as an external sizing agent or a hydrophilic surfactant on one surface. Can be manufactured. The coating method is not particularly limited as long as it can apply a coating liquid containing a water-absorbing agent, and the other surface does not contain the water-absorbing agent, the composition of the water-absorbing agent is different, A coating solution containing a water-absorbing agent, whose action is opposite to that described above, may be applied or may not be applied. As the coating device, it is preferable to use a known size press device such as a gate roll coater, a rod metering size press, a blade metering size press, a bill blade coater, and a vervapa coater, and it is possible to continuously produce a base paper for a paper cylinder. It is particularly preferable to use an on-machine type size press installed in a papermaking line because of its excellent production efficiency.
Furthermore, by cutting the base paper for a paper cylinder into a predetermined width, the belt-shaped base paper used in the present invention can be manufactured.
＜接着剤＞
　本発明の紙筒は、各層間が接着剤で貼り合わされてなる。この接着剤としては、公知の接着剤を特に制限することなく使用することができる。例えば、酢酸ビニル系、ポリビニルアルコール系、澱粉系、アクリル系、エポキシ系等の接着剤を使用することができる。これらの中で、水溶性、または、水系エマルションを含む水分散性の接着剤が、製造時の環境負荷が小さく、また、食器用途として安心して使用できるため好ましい。さらに、生分解性である接着剤が、環境への負荷が小さい点から好ましい。
　本発明の紙筒を、食器用途として使用する場合、食品添加物として認可を受けている、食品衛生法に適合している、またはＦＤＡ認証取得済み等、食品安全性に適合した接着剤を使用することが好ましい。 <Adhesive>
The paper cylinder of the present invention is formed by bonding each layer with an adhesive. As this adhesive, a known adhesive can be used without particular limitation. For example, a vinyl acetate-based, polyvinyl alcohol-based, starch-based, acrylic-based, epoxy-based adhesive, or the like can be used. Among these, a water-soluble or water-dispersible adhesive containing a water-based emulsion is preferable since it has a small environmental load during production and can be used safely for tableware. Furthermore, an adhesive that is biodegradable is preferable because it has a small impact on the environment.
When the paper cylinder of the present invention is used for tableware, use an adhesive that is approved as a food additive, conforms to the Food Sanitation Law, or has obtained FDA certification, and is compatible with food safety. Is preferred.
＜紙筒の製造方法＞
　本発明の紙筒は、公知の方法で製造することができる。すなわち、紙筒用原紙を裁断して帯状原紙とし、帯状原紙をマンドレル（鉄芯）にスパイラル巻きしながら接着剤で貼り付けることにより、本発明の紙筒を製造することができる。接着剤は、ロール状の帯状原紙を繰り出してマンドレルに巻きつけるまでの間に、帯状原紙の片面、または両面に塗布することができる。 <Method of manufacturing paper cylinder>
The paper cylinder of the present invention can be manufactured by a known method. That is, the paper cylinder of the present invention can be manufactured by cutting the paperboard for a paper cylinder into a band-shaped base paper, and attaching the band-shaped base paper with an adhesive while spirally winding the band-shaped base paper around a mandrel (iron core). The adhesive can be applied to one side or both sides of the band base paper before the roll base paper is fed out and wound around a mandrel.
　以下、本発明を実施例により説明するが、本発明は下記実施例のみに限定されるものではない。
「実施例１」
　坪量８０ｇ／ｍ２の基紙の片面に酸化澱粉（日本コーンスターチ株式会社　ＳＫ１００）を２．１ｇ／ｍ２で塗工し易吸水面を作製した。なお、ＪＩＳ　Ｐ８１４０に規定されるコッブ法（接触時間３０秒）による易吸水面の吸水度は２４．３ｇ／ｍ２であった。
　ついでこの基紙の他面に、酸化澱粉（日本コーンスターチ株式会社　ＳＫ１００）およびスチレンアクリルサイズ剤（栗田工業株式会社　ＰＥＲＧＬＵＴＩＮ　Ａ２８８）を固形分重量比１５：３となるよう混合した塗工液を２．６ｇ／ｍ２で塗工し低吸水面を作製することで紙筒用原紙を得た。ＪＩＳ　Ｐ８１４０に規定されるコッブ法（接触時間３０秒）による低吸水面の吸水度は１８．７ｇ／ｍ２であった。
　この紙筒用原紙を、幅１６ｍｍに裁断して、低吸水面および易吸水面を備えた第一および第二の帯状原紙を得た。 Hereinafter, the present invention will be described with reference to Examples, but the present invention is not limited to the following Examples.
"Example 1"
The basis weight of 80 g / m 2 base paper of one side oxidized starch (Nihon Cornstarch Corporation SK100) was prepared coating was easily water surface at 2.1 g / m 2. In addition, the water absorption of the easily water-absorbing surface by the Cobb method (contact time 30 seconds) specified in JIS P8140 was 24.3 g / m 2 .
Then, on the other side of the base paper, a coating liquid obtained by mixing oxidized starch (SK100, Nippon Cornstarch Co., Ltd.) and a styrene acryl sizing agent (PERGLUTIN A288, Kurita Water Industries, Ltd.) at a solid content weight ratio of 15: 3. By coating at 6 g / m 2 to produce a low water absorption surface, a base paper for a paper cylinder was obtained. The water absorption of the low water absorption surface by the Cobb method (contact time 30 seconds) specified in JIS P8140 was 18.7 g / m 2 .
The paper cylinder base paper was cut into a width of 16 mm to obtain first and second belt-shaped base papers having a low water absorption surface and an easy water absorption surface.
　直径６ｍｍのマンドレルに、第一の帯状原紙を低吸水面が内側となるように螺旋状に巻き付け、内層を形成した。第二の帯状原紙の易吸水面にポリ酢酸ビニル系接着剤（日栄化工株式会社　ＡＶ―６５０Ｙ―６Ｌ）を塗工量７ｇ／ｍ２で塗工した後、内層上に易吸水面を内側として螺旋状に巻き付けて外層を形成し、紙筒を得た。 The first band-shaped base paper was spirally wound around a mandrel having a diameter of 6 mm so that the low water-absorbing surface was inside to form an inner layer. After coating with a second strip-shaped sheet of the easily water surface polyvinyl acetate-based adhesive (NICHIEI Kako Co., Ltd. AV-650Y-6L) a coating weight 7 g / m 2, the easily water surface as an inner over the inner layer The outer layer was formed by spirally winding to obtain a paper cylinder.
「実施例２」
　低吸水面のスチレンアクリルサイズ剤をＡＫＤサイズ剤（星光ＰＭＣ株式会社　ＳＥ２３６６）とし、塗工量を２．５ｇ／ｍ２とした以外は、実施例１と同様にして紙筒用原紙を得た。この紙筒用原紙のＪＩＳ　Ｐ８１４０に規定されるコッブ法（接触時間３０秒）による低吸水面の吸水度は１６．７ｇ／ｍ２であった。
　この紙筒用原紙を用いて、実施例１と同様の方法で紙筒を得た。 "Example 2"
A paper tube base paper was obtained in the same manner as in Example 1, except that the styrene acrylic sizing agent having a low water absorption surface was an AKD sizing agent (SEIKO PMC SE2366) and the coating amount was 2.5 g / m 2 . . The water absorbency of the low water absorption surface of the base paper for a paper cylinder by the Cobb method (contact time: 30 seconds) specified in JIS P8140 was 16.7 g / m 2 .
Using this base paper for a paper cylinder, a paper cylinder was obtained in the same manner as in Example 1.
「実施例３」
　低吸水面の酸化澱粉をエチレン変性ポリビニルアルコール（株式会社クラレ社　エクセバールＲＳ４１０４）とし、塗工量を２．６ｇ／ｍ２とした以外は実施例１と同様にして紙筒用原紙を得た。この紙筒用原紙のＪＩＳ　Ｐ８１４０に規定されるコッブ法（接触時間３０秒）による低吸水面の吸水度は１４．８ｇ／ｍ２であった。
　この紙筒用原紙を用いて、実施例１と同様の方法で紙筒を得た。 "Example 3"
A base paper for a paper cylinder was obtained in the same manner as in Example 1, except that the oxidized starch having a low water absorption surface was ethylene-modified polyvinyl alcohol (Exeval RS4104, Kuraray Co., Ltd.) and the coating amount was 2.6 g / m 2 . The water absorption of the low water absorption surface of this paperboard base paper by the Cobb method (contact time 30 seconds) specified in JIS P8140 was 14.8 g / m 2 .
Using this base paper for a paper cylinder, a paper cylinder was obtained in the same manner as in Example 1.
「実施例４」
　低吸水面の酸化澱粉をエチレン変性ポリビニルアルコール（株式会社クラレ社　エクセバールＲＳ４１０４）、スチレンアクリルサイズ剤をＡＫＤサイズ剤（星光ＰＭＣ株式会社　ＳＥ２３６６）とし、塗工量を２．７ｇ／ｍ２とした以外は実施例１と同様にして紙筒用原紙を得た。この紙筒用原紙のＪＩＳ　Ｐ８１４０に規定されるコッブ法（接触時間３０秒）による低吸水面の吸水度は１３．６ｇ／ｍ２であった。
　この紙筒用原紙を用いて、実施例１と同様の方法で紙筒を得た。 "Example 4"
Except that the oxidized starch on the low water absorption surface was ethylene-modified polyvinyl alcohol (Exeval RS4104, Kuraray Co., Ltd.), the styrene acrylic sizing agent was AKD sizing agent (SEIKO PMC SE2366), and the coating amount was 2.7 g / m 2. In the same manner as in Example 1, a paper cylinder base paper was obtained. The water absorption of the low water absorption surface of the base paper for paper cylinder by the Cobb method (contact time 30 seconds) specified in JIS P8140 was 13.6 g / m 2 .
Using this base paper for a paper cylinder, a paper cylinder was obtained in the same manner as in Example 1.
「実施例５」
　坪量１１０ｇ／ｍ２、ＪＩＳ　Ｐ８１４０に規定されるコッブ法（接触時間３０秒）による吸水度が両面とも１６．３ｇ／ｍ２である基紙の片面のみに、界面活性剤（日信化学工業株式会社製、サーフィノール４６５）を塗工量０．０２ｇ／ｍ２で塗工し易吸水面とし、紙筒用原紙を得た。易吸水面のＪＩＳ　Ｐ８１４０に規定されるコッブ法（接触時間３０秒）による吸水度は２８．１ｇ／ｍ２であった。また、非塗工面である低吸水面の吸水度は、裏面への界面活性剤の塗工の前後で変化はなかった。
　この紙筒用原紙を用いて、実施例１と同様の方法で紙筒を得た。 "Example 5"
A surface-active agent (Nissin Chemical Industries, Ltd.) has a basis weight of 110 g / m 2 and a water absorption of 16.3 g / m 2 on both sides according to the Cobb method (contact time 30 seconds) specified in JIS P8140. Co., Ltd., Surfynol 465) was applied at a coating amount of 0.02 g / m 2 to give an easily water-absorbing surface to obtain a base paper for a paper cylinder. The water absorption of the easily water-absorbing surface measured by the Cobb method (contact time: 30 seconds) specified in JIS P8140 was 28.1 g / m 2 . Further, the water absorption of the low water-absorbing surface, which is the non-coated surface, did not change before and after the application of the surfactant to the back surface.
Using this base paper for a paper cylinder, a paper cylinder was obtained in the same manner as in Example 1.
「実施例６」
　坪量６０ｇ／ｍ２の基紙を用いた以外は、実施例５と同様にして紙筒用原紙を得た。塗工面である易吸水面、非塗工面である低吸水面のＪＩＳ　Ｐ８１４０に規定されるコッブ法（接触時間３０秒）による吸水度は、それぞれ２９．９ｇ／ｍ２、１６．２ｇ／ｍ２であった。
　この紙筒用原紙を用いて、実施例１と同様の方法で紙筒を得た。 "Example 6"
A base paper for a cylinder was obtained in the same manner as in Example 5, except that a base paper having a basis weight of 60 g / m 2 was used. Easy water surface is coated surface, water absorption by the non-coated is cumene Cobb method specified in JIS P8140 of the low water surface (contact time 30 seconds), respectively 29.9g / m 2, 16.2g / m 2 Met.
Using this base paper for a paper cylinder, a paper cylinder was obtained in the same manner as in Example 1.
・耐水性試験１
　上記実施例で製造した紙筒を常温の水を入れたコップに３０分浸漬し、浸漬部分で剥離の有無を目視で確認した。
　実施例１～６で製造した紙筒は、いずれも３０分浸漬した後も、内層と外層との間で剥離が生じず、紙ストローとして好適に使用することが可能であった。 ・ Water resistance test 1
The paper cylinder manufactured in the above example was immersed in a cup filled with water at normal temperature for 30 minutes, and the presence or absence of peeling at the immersed portion was visually checked.
Each of the paper cylinders manufactured in Examples 1 to 6 did not peel off between the inner layer and the outer layer even after being immersed for 30 minutes, and could be suitably used as a paper straw.
・耐水性試験２
　図２に、耐水性試験２の模式図を示す。
　上記実施例で抄紙した各紙筒用原紙を５ｃｍ×２０ｃｍの短冊状に２枚断裁し、紙筒の作成に使用したのと同じポリ酢酸ビニル系接着剤を片側の原紙の易吸水面側にマイヤーバーを用いて固形分３０ｇ／ｍ２となるように短辺側端部から３ｃｍの領域を除いて塗工した。次いで、もう片側の原紙の易吸水面側を前記接着剤の塗工面に貼り合わせ、一晩乾燥させて試験片を得た。
　試験片の接着されていない部分で、一方の原紙をクリップでワイヤーに固定し、他方の原紙の短辺側端部に１００ｇの重りをクリップで固定した状態で、水７Ｌを入れた１０Ｌ容器に重りが容器底面に接触しないよう試験片全体を浸漬した。試験片の接着面が重りを固定した端部側から５ｃｍ剥離するまでの時間を測定した。結果を表１に示す。
　実施例１～６で製造した紙筒用原紙は、１００ｇ／５ｃｍ幅の加重が加わった状態で、５ｃｍ剥離するまでに５分以上の時間を要し、耐水性は良好であった。 ・ Water resistance test 2
FIG. 2 shows a schematic diagram of the water resistance test 2.
The base paper for each paper cylinder made in the above example was cut into two strips of 5 cm × 20 cm, and the same polyvinyl acetate adhesive as used in the preparation of the paper cylinder was applied to one base paper on the easily water-absorbing side of the base paper. Using a bar, coating was carried out so as to obtain a solid content of 30 g / m 2 except for an area 3 cm from the short side end. Next, the other water-absorbing surface side of the base paper was adhered to the coated surface of the adhesive and dried overnight to obtain a test piece.
In a portion where the test piece is not adhered, one base paper is fixed to a wire with a clip, and a 100 g weight is fixed to the short side end of the other base paper with a clip. The entire test piece was immersed so that the weight did not contact the bottom of the container. The time until the adhesive surface of the test piece was peeled off 5 cm from the end side where the weight was fixed was measured. Table 1 shows the results.
The paper cylinder base papers manufactured in Examples 1 to 6 required 5 minutes or more to peel off 5 cm under a load of 100 g / 5 cm width, and had good water resistance.
Figure JPOXMLDOC01-appb-T000001
  
Figure JPOXMLDOC01-appb-T000001
  

Claims (5)

  1. 　第一の帯状原紙が螺旋状に巻回されてなる内層と、第二の帯状原紙が螺旋状に巻回されてなる外層とを有し、
    　前記第一および第二の帯状原紙が低吸水面と易吸水面とを備え、
    　内面が前記第一の帯状原紙の低吸水面、外面が前記第二の帯状原紙の低吸水面から形成されていることを特徴とする紙筒。     The first band-shaped base paper has an inner layer that is spirally wound, and the second band-shaped base paper has an outer layer that is spirally wound,
    The first and second band-shaped base papers have a low water absorption surface and an easy water absorption surface,
    A paper cylinder characterized in that an inner surface is formed by a low water absorption surface of the first band base paper and an outer surface is formed by a low water absorption surface of the second band base paper.
  2. 　前記第一の帯状原紙と前記第二の帯状原紙とが、接着剤で接着されていることを特徴とする請求項１に記載の紙筒。 The paper cylinder according to claim 1, wherein the first strip-shaped base paper and the second strip-shaped base paper are adhered with an adhesive.
  3. 　内層と外層との間に、第三の帯状原紙が螺旋状に巻回されてなる中間層を有し、
    　前記第三の帯状原紙が、両面が易吸水面であり、各層間が接着剤で接着されていることを特徴とする請求項１に記載の紙筒。     Between the inner layer and the outer layer, the third belt-shaped base paper has an intermediate layer that is spirally wound,
    2. The paper cylinder according to claim 1, wherein the third band base paper has an easily water-absorbing surface on both sides, and each layer is adhered with an adhesive. 3.
  4. 　前記第一の帯状原紙の低吸水面、第二の帯状原紙の低吸水面のいずれか、または両方が、外添サイズ剤が塗工されていることを特徴とする請求項１～３のいずれかに記載の紙筒。 4. The method according to claim 1, wherein one or both of the low water absorption surface of the first band base paper and the low water absorption surface of the second band base paper are coated with an external sizing agent. The paper tube described in Crab.
  5. 　前記第一の帯状原紙の易吸水面、第二の帯状原紙の易吸水面のいずれか、または両方が、親水性界面活性剤が塗工されていることを特徴とする請求項１～３のいずれかに記載の紙筒。
          4. The hydrophilic surface-active agent is applied to one or both of the water-absorbing surface of the first band base paper and the water-absorbing surface of the second band base paper. Paper cylinder according to any of the above.
PCT/JP2019/035939 2018-09-21 2019-09-12 Paper tube WO2020059635A1 (en)

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WO2021200739A1 (en) * 2020-03-30 2021-10-07 株式会社クラレ Water-based adhesive for paper straws, and paper straw
JP2022056292A (en) * 2020-09-29 2022-04-08 ソイル コーポレーション Manufacturing method of paper straw including multistage binding structure and the paper straw
JP2022056293A (en) * 2020-09-29 2022-04-08 ソイル コーポレーション Manufacturing method of hybrid paper straw including multistage binding structure and hybrid paper straw
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JP2020138014A (en) * 2019-02-25 2020-09-03 三ツ星ベルト株式会社 Paper-made straw and method for producing the same
JP7405639B2 (en) 2019-02-25 2023-12-26 三ツ星ベルト株式会社 Paper straw and its manufacturing method
WO2021200739A1 (en) * 2020-03-30 2021-10-07 株式会社クラレ Water-based adhesive for paper straws, and paper straw
JP2022056292A (en) * 2020-09-29 2022-04-08 ソイル コーポレーション Manufacturing method of paper straw including multistage binding structure and the paper straw
JP2022056293A (en) * 2020-09-29 2022-04-08 ソイル コーポレーション Manufacturing method of hybrid paper straw including multistage binding structure and hybrid paper straw
JP7085239B2 (en) 2020-09-29 2022-06-16 ソイル コーポレーション Paper straw manufacturing method including multi-stage binding structure and its paper straw
JP7085240B2 (en) 2020-09-29 2022-06-16 ソイル コーポレーション Hybrid paper straw manufacturing method including multi-stage binding structure and hybrid paper straw
US20220396001A1 (en) * 2020-12-17 2022-12-15 Long Bamboo Technology Group Co., Ltd. Bamboo straw machining method
JP2023510061A (en) * 2020-12-17 2023-03-13 龍竹科技集団股▲分▼有限公司 How bamboo straws are processed
EP4035572A4 (en) * 2020-12-17 2023-06-14 Long Bamboo Technology Group Co., Ltd. Bamboo straw processing method
JP7350093B2 (en) 2020-12-17 2023-09-25 龍竹科技集団股▲分▼有限公司 How to process bamboo straws

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