WO2020241435A1 - Kraft paper and kraft paper sack - Google Patents
Kraft paper and kraft paper sack Download PDFInfo
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- WO2020241435A1 WO2020241435A1 PCT/JP2020/020052 JP2020020052W WO2020241435A1 WO 2020241435 A1 WO2020241435 A1 WO 2020241435A1 JP 2020020052 W JP2020020052 W JP 2020020052W WO 2020241435 A1 WO2020241435 A1 WO 2020241435A1
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
- D21H11/04—Kraft or sulfate pulp
Definitions
- the present invention relates to kraft paper and kraft paper bags.
- the present invention relates to kraft paper and kraft paper bags suitable for heavy packaging used for filling and transporting powder products.
- Kraft paper obtained from kraft pulp is used for various purposes such as bag making and wrapping paper.
- Kraft paper, especially kraft paper bags for heavy packaging for transporting heavy objects, is required to have high strength so as not to cause bag breakage in processes such as filling, transporting, and storing the contents.
- Patent Document 1 proposes kraft paper that has both strength and breathability by using pulp having a long fiber length.
- kraft paper obtained from kraft pulp is a strong, durable and hard-to-tear paper, so it can be used for various purposes such as heavy wrapping paper bags used for transporting heavy objects, corrugated cardboard materials, envelopes, and adhesive tapes. It may also be used (Patent Document 2).
- kraft paper bags are sometimes used for transporting heavy objects, they need to be strong and durable.
- the kraft paper bag needs to have a certain degree of air permeability.
- the speed of airflow filling has been increasing, so that kraft paper bags are required to have further improved air permeability. Therefore, in view of the above circumstances, it is an object of the present invention to provide kraft paper having higher breathability while maintaining strength and a kraft paper bag using the same.
- the present invention has adopted the following configuration.
- Kraft paper containing kraft pulp as the main component The Canadian standard free water content measured in accordance with JIS P 811-2: 2012 of the disintegrated pulp obtained by disintegrating the kraft paper by the pulp disintegration method described in JIS P 8220: 2012 is 700 mL or more, and JIS Kraft paper having a fiber roughness of 0.200 mg / m or more as measured in accordance with P 8120: 1998.
- JIS P 8116 ratio tear strength in the longitudinal direction as measured according to 2000 is at 15.0mN ⁇ m 2 / g or more, lateral specific tear strength 18.0mN ⁇ m 2 / The kraft paper according to [1], which is g or more.
- the longitudinal tensile elongation at break measured in accordance with JIS P 8113: 2006 is 8.0% or more, and the lateral tensile elongation at break is 6.0% or more, [1] or [ 2] The kraft paper described in.
- the present invention may have the following configuration.
- Kraft paper containing kraft pulp as the main component The basis weight measured in accordance with JIS P 8124: 2011 is 70 g / m 2 or more. Measured according to JIS P 8140: 1998, the Cobb water absorption at a temperature of 23 ° C. and a contact time of 60 seconds is 15 to 28 g / m 2 . Kraft paper with a ratio of Cobb water absorption to basis weight of 0.18 to 0.35.
- JIS P 8116 ratio tear strength in the longitudinal direction as measured according to 2000 is at 15.0mN ⁇ m 2 / g or more, the ratio of the transverse tear strength of 18.0mN ⁇ m 2 / The kraft paper according to [11], which is g or more.
- the longitudinal tensile elongation at break measured in accordance with JIS P 8113: 2006 is 8.0% or more, and the lateral tensile elongation at break is 6.0% or more, [11] or [ 12] The kraft paper described in.
- the specific tensile energy absorption amount in the vertical direction measured in accordance with JIS P 8113: 2006 is 2.5 J / g or more, and the specific tensile energy absorption amount in the horizontal direction is 2.3 J / g or more.
- the kraft paper according to any one of [11] to [14], wherein the air permeation resistance measured in accordance with JIS P 8117: 2009 is 10 seconds or less.
- the Canadian standard freeness measured in accordance with JIS P 811-2: 2012 of the obtained disintegrated pulp is 700 mL or more.
- One embodiment of the present invention is kraft paper containing kraft pulp as a main component, and JIS P 811-2 of the disintegrated pulp obtained by disintegrating the kraft paper by the pulp disintegration method described in JIS P 8220: 2012. : Kraft paper having a Canadian standard freeness of 700 mL or more measured in accordance with 2012 and a fiber roughness of 0.200 mg / m or more measured in accordance with JIS P 8120: 1998.
- the kraft paper according to this embodiment has excellent breathability while maintaining strength. Further, according to the kraft paper bag according to the present embodiment, it is possible to efficiently perform air blowing filling.
- another embodiment of the present invention is kraft paper containing kraft pulp as a main component, and the basis weight measured in accordance with JIS P 8124: 2011 is 70 g / m 2 or more, and JIS P 8140.
- Cobb water absorption at a temperature of 23 ° C. and a contact time of 60 seconds, measured in accordance with 1998, is 5 to 40 g / m 2 (preferably 10 to 35 g / m 2 , more preferably 15 to 28 g / m 2 ).
- It is a kraft paper having a ratio of the water absorption of Cobb to the basis weight of 0.10 to 0.45 (preferably 0.15 to 0.40, more preferably 0.18 to 0.35). Even if the kraft paper according to the present embodiment is stored in a stacked state, the glue used during bag making does not easily penetrate to the opposite surface, and the surface stickiness and adhesion between the kraft paper bags do not easily occur.
- the present invention will be described in detail below.
- the description of the constituent elements described below may be based on typical embodiments or specific examples, but the present invention is not limited to such embodiments.
- the numerical range represented by using "-" means a range including the numerical values before and after "-" as the lower limit value and the upper limit value.
- the kraft paper of the present invention contains kraft pulp as a main component.
- kraft pulp is pulp obtained by treating wood with an alkaline chemical containing sodium hydroxide and sodium sulfide as main components.
- the main component in kraft paper means a component that accounts for 50% by mass or more with respect to the total mass of kraft paper. That is, the mass ratio of kraft pulp to the total mass of kraft paper is preferably 50% by mass or more, more preferably 60% by mass or more, and further preferably 70% by mass or more. The mass ratio of kraft pulp to the total mass of kraft paper is preferably 100% by mass or less.
- the ratio of the mass (solid content) of the kraft pulp to the mass (solid content) of the total pulp constituting the kraft paper is preferably 97% by mass or more, and more preferably 98% by mass or more.
- the ratio of the mass (solid content) of kraft pulp to the mass (solid content) of all pulp constituting the kraft paper is preferably 100% by mass or less.
- the dissociated pulp obtained (hereinafter, simply referred to as "dissociated pulp") is measured in accordance with JIS P 811-2: 2012.
- the Canadian standard freeness (hereinafter sometimes referred to as “freeness”) is 700 mL or more
- the fiber roughness measured in accordance with JIS P 8120: 1998 (hereinafter, simply referred to as “fiber roughness”). ) Is 0.200 mg / m or more. Since the kraft paper of the present invention has the above-mentioned structure, it has both excellent strength and breathability.
- the upper limit of the freeness of the dissociated pulp measured in accordance with JIS P 811-2: 2012 is not particularly limited, but is preferably 800 mL or less, more preferably 750 mL or less, and preferably 735 mL or less. More preferred.
- the freeness of the dissociated pulp can be adjusted by beating or the like.
- the basis weight measured according to JIS P 8124: 2011 of kraft paper is preferably 70 g / m 2 or more, more preferably 75 g / m 2 or more, and 80 g / m 2 or more. Is even more preferable.
- the upper limit of the basis weight measured in accordance with JIS P 8124: 2011 of kraft paper is not particularly limited, but is preferably 150 g / m 2 or less.
- the Cobb water absorption at a temperature of 23 ° C. and a contact time of 60 seconds, measured in accordance with JIS P 8140: 1998 of kraft paper, is preferably 5 to 40 g / m 2 and preferably 10 to 35 seconds. Is more preferable, 15 to 28 g / m 2 is further preferable, and 20 to 25 g / m 2 is particularly preferable.
- the ratio of the water absorption of the cobb to the basis weight is preferably 0.10 to 0.45, more preferably 0.15 to 0.40, and even more preferably 0.18 to 0.35. , 0.21 to 0.35, more preferably 0.28 to 0.35.
- the ratio of the Cobb water absorption to the basis weight is the value of the Cobb water absorption / basis weight.
- Cobb water absorption can be adjusted by adding a sizing agent, for example.
- the sizing agent include a rosin-based sizing agent, an alkyl ketene dimer-based sizing agent, an alkenyl succinic anhydride-based sizing agent, and a synthetic sizing agent.
- the amount of the sizing agent added is preferably 0.05 to 1.00% by mass, preferably 0.10 to 0.20% by mass, based on the mass (solid content) of the total pulp constituting the kraft paper. Is more preferable.
- the fiber roughness of the dissociated pulp obtained is defined in JIS P 8120: 1998 (hereinafter, simply referred to as "fiber roughness". ) Is 0.200 mg / m or more.
- the upper limit of the fiber roughness is not particularly limited, but is preferably 0.400 mg / m or less, more preferably 0.350 mg / m or less, and further preferably 0.300 mg / m or less. It is particularly preferably 0.250 mg / m or less.
- Fiber roughness is the absolute dry mass of fiber per unit length. The larger the fiber roughness, the more curled the fiber and the easier it is for elongation to develop.
- the fiber roughness of the disintegrated pulp can be adjusted by the runkel ratio of the raw material pulp, the copper value (K ⁇ value) of the raw material pulp, the blade used for beating, the temperature at the time of beating, and the like.
- the Runkel ratio is a value obtained by dividing twice the average fiber wall thickness (average of the cell wall thickness of fibers) by the average diameter of the lumen diameter. The average lumen diameter is determined by subtracting twice the average fiber wall thickness from the average fiber width. That is, the Runkel ratio is a value obtained from the average fiber wall thickness and the average fiber width.
- the average fiber wall thickness and average fiber width required to obtain the Runkel ratio can be measured by a fiber analyzer (Kajaani FiberLab ver4.0, manufactured by Mezzo Automation).
- the runkel ratio of the raw material pulp is preferably 1.5 to 2.5, and more preferably 1.7 to 2.3.
- the Runkel ratio is higher for pulp made from softwood than for pulp made from hardwood. Therefore, the runkel ratio of the raw material pulp can be adjusted by the mixing ratio of the softwood kraft pulp and the hardwood kraft pulp. However, the raw material pulp may be only softwood kraft pulp.
- coniferous kraft pulp examples include unbleached coniferous kraft pulp (NUKP), bleached coniferous kraft pulp (NBKP), semi-bleached coniferous kraft pulp (NSBKP), and coniferous sulfite pulp. These may be used together. Above all, it is preferable to use softwood unbleached kraft pulp (NUKP) as the raw material pulp in terms of excellent tensile elongation at break and strength.
- grades of softwood kraft pulp examples include Douglas fir, Japanese red pine, spruce, and radiata pine. Among them, Douglas fir is preferably used because it has a high Runkel ratio. Two or more of these may be used in combination as the raw material pulp.
- broad-leaved kraft pulp examples include broad-leaved unbleached kraft pulp (LUKP), broad-leaved bleached kraft pulp (LBKP), broad-leaved semi-bleached kraft pulp (LSBKP), and broad-leaved sulfite pulp.
- LLKP broad-leaved unbleached kraft pulp
- LLBKP broad-leaved bleached kraft pulp
- LSBKP broad-leaved semi-bleached kraft pulp
- broad-leaved sulfite pulp broad-leaved sulfite pulp.
- the K ⁇ value is an index of the lignin content or bleaching property of pulp measured in accordance with JIS P 8211: 2011.
- the K ⁇ value is too low, the strength of the single fiber may decrease.
- the K ⁇ value is too high, the fibers are hard, so that curling is difficult and elongation may be difficult to develop. Therefore, considering the balance as a whole, the K ⁇ value of the raw material pulp is preferably 35 to 55, and more preferably 38 to 50.
- a deluxe finer (basalt) is preferable as the blade used for beating.
- the deluxe finer has a wider blade width for both the rotor and the stator, so the beating is closer to kneading and loosening than cutting, and it is easy to curl and stretch. That is, the fiber roughness of the disintegrated pulp can be increased.
- the tear strength of kraft paper is unlikely to decrease.
- the temperature at the time of beating is preferably 30 to 90 ° C, more preferably 70 to 90 ° C.
- the higher the temperature the easier it is for curling and the more likely it is to develop elongation. That is, the fiber roughness of the disintegrated pulp can be increased.
- the softening point of lignin is 70 ° C. or higher, when the lignin is beaten at 70 ° C. or higher, the fibers become soft and curl (roughness) is particularly likely to occur.
- the specific tear strength in the vertical direction measured in accordance with JIS P 8116: 2000 of kraft paper is not particularly limited, but is preferably 15.0 mN ⁇ m 2 / g or more from the viewpoint of drop impact resistance. , 16.0 mN ⁇ m 2 / g or more, more preferably 17.0 mN ⁇ m 2 / g or more, further preferably 17.5 mN ⁇ m 2 / g or more, 18 It is particularly preferable that the content is 0.0 mN ⁇ m 2 / g or more.
- the upper limit of the relative tear strength in the longitudinal direction is not particularly limited, but is preferably 25.0 mN ⁇ m 2 / g or less.
- the lateral specific tear strength measured in accordance with JIS P 8116: 2000 of kraft paper is not particularly limited, but is preferably 18.0 mN ⁇ m 2 / g or more, and 20.0 mN ⁇ . more preferably m 2 / g or more, still more preferably 22.0MN ⁇ m 2 / g or more, particularly preferably 23.0MN ⁇ m 2 / g or more.
- the ratio tear strength in the transverse direction is not particularly limited, from the viewpoint of the drop impact resistance is preferably at most 28.0mN ⁇ m 2 / g, more not more than 26.0mN ⁇ m 2 / g preferably, more preferably at most 25.0mN ⁇ m 2 / g, particularly preferably not more than 24.0mN ⁇ m 2 / g.
- the relative tear strength in the vertical direction and the horizontal direction is equal to or higher than the above lower limit value, a kraft paper bag that is unlikely to break in the steps of filling, transporting, and storing the contents can be obtained.
- the relative tear strength in the longitudinal direction and the lateral direction tends to be higher as the freeness of the disintegrated pulp is larger.
- the horizontal direction means the width direction of the paper machine
- the vertical direction means the flow direction of the paper machine.
- the tensile elongation at break in the vertical direction measured in accordance with JIS P 8113: 2006 of kraft paper is preferably 6.0% or more from the viewpoint of drop impact resistance and / or suppression of glue penetration. It is more preferably 0% or more, further preferably 7.5% or more, further preferably 8.0% or more, and particularly preferably 8.5% or more.
- the tensile elongation at break in the longitudinal direction is not particularly limited, but is preferably 12.0% or less, and more preferably 10.0% or less.
- the tensile elongation at break in the lateral direction measured in accordance with JIS P 8113: 2006 of kraft paper is not particularly limited, but is preferably 4.0% or more, and preferably 5.0% or more.
- the tensile elongation at break in the lateral direction is not particularly limited, but is preferably 10.0% or less, more preferably 9.0% or less, and further preferably 8.0% or less.
- the tensile elongation at break in the vertical direction and the horizontal direction is at least the above lower limit value, a kraft paper bag that is unlikely to break in the steps of filling, transporting, and storing the contents can be obtained.
- the tensile elongation at break in the longitudinal direction and the transverse direction tends to be higher as the fiber roughness of the dissociated pulp is larger.
- the amount of specific tensile energy absorbed in the vertical direction specified in JIS P 8113: 2006 of kraft paper is preferably 2.5 J / g or more, more preferably 2.8 J / g or more, and 3.0 J. It is more preferably / g or more.
- the lateral specific tensile energy absorption amount specified in JIS P 8113: 2006 of kraft paper is preferably 1.5 J / g or more from the viewpoint of drop impact resistance and / or suppression of glue penetration. It is more preferably 2.0 J / g or more, further preferably 2.3 J / g or more, further preferably 2.5 J / g or more, and particularly preferably 2.8 J / g or more. preferable.
- the specific tensile energy absorption amount in the vertical direction and the horizontal direction is equal to or higher than the above lower limit value, a kraft paper bag that is less likely to break in the process of filling, transporting, storing, etc. of the contents can be obtained.
- the amount of specific tensile energy absorbed in the longitudinal direction and the lateral direction tends to be higher as the fiber roughness of the disintegrated pulp is larger.
- the air permeability resistance measured in accordance with JIS P 8117: 2009 of kraft paper is preferably 50 seconds or less, more preferably 30 seconds or less, further preferably 20 seconds or less. It is more preferably 10 seconds or less, and particularly preferably 7 seconds or less. Further, the air permeation resistance measured in accordance with JIS P 8117: 2009 of kraft paper is preferably 0 seconds or more. When the air permeation resistance is not more than the above upper limit value, kraft paper having excellent breathability can be obtained. The air permeation resistance tends to be lower as the freeness of the dissociated pulp increases.
- Kraft paper may contain arbitrary components in addition to kraft pulp.
- Optional components include sizing agents, anionic, cationic or amphoteric yield improvers, drainage improvers, dry paper strength enhancers, wet paper strength enhancers, internal chemicals such as fillers, water resistant agents, and dyes. , Fluorescent whitening agent and the like.
- the sizing agent examples include internal sizing agents such as rosin and alkyl ketene dimer (AKD); surface sizing agents such as styrene / acrylic acid copolymer and styrene / methacrylic acid copolymer.
- the blending amount of the sizing agent is not particularly limited, but is preferably 1.0 part by mass or less, more preferably 0.50 part by mass or less, and further preferably 0.% by mass with respect to 100 parts by mass (solid content equivalent) of the raw material pulp. It is 30 parts by mass or less, more preferably 0.20 parts by mass or less.
- the blending amount of the sizing agent is preferably 0 parts by mass or more with respect to 100 parts by mass of the raw material pulp.
- the yield improving agent examples include polyacrylamide and sulfuric acid band.
- the amount of the yield improving agent to be blended is not particularly limited, but is preferably 5.0 parts by mass or less, more preferably 3.0 parts by mass or less, and further, with respect to 100 parts by mass (solid content equivalent) of the raw material pulp. It is preferably 2.5 parts by mass or less. Further, the blending amount of the yield improving agent is preferably 0 parts by mass or more with respect to 100 parts by mass of the raw material pulp.
- dry paper strength enhancer examples include cationized starch, polyacrylamide, carboxymethyl cellulose and the like.
- the amount of the dry paper strength enhancer to be blended is not particularly limited, but is preferably 3.0 parts by mass or less, more preferably 2.0 parts by mass or less, based on 100 parts by mass (solid content equivalent) of the raw material pulp.
- the blending amount of the dry paper strength enhancer is preferably 0 parts by mass or more with respect to 100 parts by mass of the raw material pulp.
- wet paper strength enhancer examples include polyamide polyamine epichlorohydrin (PAE), urea formaldehyde resin, melamine formaldehyde resin, and the like, and the wet paper strength enhancer is preferably PAE.
- the blending amount of the wet paper strength enhancer in the paper base material is not particularly limited, but is preferably 0.05 parts by mass or more, more preferably 0.07 parts by mass with respect to 100 parts by mass (solid content equivalent) of the raw material pulp. It is more than a department.
- the amount of the wet paper strength enhancer blended is preferably 1.0 part by mass or less, and more preferably 0.7 part by mass or less with respect to 100 parts by mass of the raw material pulp.
- Fillers include clay, talc, kaolin, calcined kaolin, calcium carbonate, calcium sulfate, barium sulfate, titanium dioxide, zinc oxide, alumina, magnesium carbonate, magnesium oxide, silica, white carbon, bentonite, zeolite, sericite, smectite, etc.
- Inorganic fillers organic fillers such as acrylic resins and vinylidene chloride resins can be mentioned.
- the kraft paper may have a coating layer.
- the coating layer is preferably a coating layer containing a natural adhesive such as starch or a synthetic adhesive such as polyvinyl alcohol, polyacrylamide, styrene-butadiene copolymer resin, and acrylic resin as a main component.
- the coating amount of the coating layer is preferably 0.3 to 3.0 g / m 2 .
- the method for producing kraft paper of the present invention includes a step of using wood chips as a main raw material and steaming it by a kraft method to obtain unbleached kraft pulp, a step of beating the unbleached kraft pulp to obtain pulp slurry, and pulp. It is preferable to include a step of making a pulp of the slurry. In addition, pulp other than unbleached kraft pulp may be added to this pulp slurry. Further, the above-mentioned internal chemicals may be added to the pulp slurry as long as the effects of the present invention are not impaired.
- the sizing agent it is preferable to add the above-mentioned sizing agent.
- the amount of the sizing agent added is preferably 0.05 to 1.00% by mass, preferably 0.10 to 0.20% by mass, based on the mass (solid content) of the total pulp contained in the slurry. Is more preferable.
- a dry paper strength enhancer to the pulp slurry after beating.
- the amount of the dry paper strength enhancer added is preferably 0.5 to 3.0% by mass with respect to the mass (solid content) of the total pulp contained in the slurry.
- the freeness of the disintegrated pulp in order to set the freeness of the disintegrated pulp to 700 to 750 mL, it is preferable to perform beating until the finished freeness is 670 to 750 mL. Further, for example, in order to make the fiber roughness of the disintegrated pulp 0.200 mg / m or more, it is preferable to perform beating until the finished fiber roughness becomes 0.160 to 0.250 mg / m.
- the temperature at the time of beating is preferably 30 to 90 ° C, more preferably 70 to 90 ° C.
- the higher the temperature the easier it is for curling and the more likely it is to develop elongation. That is, the fiber roughness of the disintegrated pulp can be increased.
- the softening point of lignin is 70 ° C. or higher, when the lignin is beaten at 70 ° C. or higher, the fibers become soft and curl (roughness) is particularly likely to occur.
- kraft paper paper making method and the paper machine type. It is possible. In addition, special processing such as crepe processing can be performed if necessary.
- the kraft paper bag of the present invention is a bag made from the above-mentioned kraft paper.
- the shape of the bag is not particularly limited. Examples include a glue bag such as a bottom bag with a foldless valve.
- Glue may be used when making kraft paper bags.
- the glue used during bag making include vinyl acetate copolymers, ethylene-vinyl acetate copolymers, acrylic copolymers, hot melt resins, and carboxymethyl cellulose.
- Water is preferable as the solvent for the glue used during bag making.
- the dry coating amount of the glue used at the time of bag making is preferably 15 to 23 g / m 2 .
- the dry coating amount is equal to or more than the above lower limit value, it can be firmly adhered with glue, so that bag making is easy. Further, if the dry coating amount is not more than the above upper limit value, the glue does not easily seep out even if the kraft paper bags are stacked after the bag is made.
- the kraft paper bag of the present invention is preferably a multi-layer paper bag having two or more layers in order to further increase the strength.
- the kraft paper bag is a multi-layer paper bag, for example, it may have a structure in which a synthetic resin layer is laminated on the above-mentioned kraft paper, or a three-layer structure of kraft paper / synthetic resin layer / kraft paper. Further, when the kraft paper bag is a multi-layer paper bag, an adhesive layer may be provided between each layer.
- the kraft paper bag of the present invention is a tough paper bag, it can be used as a heavy wrapping paper bag that can withstand the weight and handling of the contents by wrapping the contents in weight units.
- the contents of the kraft paper bag of the present invention are not particularly limited, but powder or granular materials are preferable as the contents because they are excellent in air permeability and suitable for air-filling. That is, the kraft paper bag of the present invention is preferably for containing powder.
- K ⁇ value The K ⁇ value of the dissociated pulp was measured by the method specified in JIS P 8211: 2011.
- the kraft paper produced in the following Examples and Comparative Examples was disintegrated by the pulp dissociation method described in JIS P 8220: 2012 to obtain dissociated pulp.
- JIS P 8120: 1998 accurately separate 25 mL (equivalent to 5 mg of absolute dry pulp) from a slurry obtained by diluting dissociated pulp with water to 0.02% by mass, and use Kajaani FiberLab ver4.0 manufactured by Metso Automation Co., Ltd. The fiber roughness of the disintegrated pulp was measured.
- the basis weight of kraft paper was measured according to the method specified in JIS P 8124: 2011. Subsequently, the thickness of the kraft paper was measured by the method specified in JIS P 8118: 2014. The value obtained by dividing the basis weight by the paper thickness was taken as the density of kraft paper.
- a tear tester Elemendorff tear tester (SA-W type) manufactured by Toyo Seiki Co., Ltd.) according to the method specified in JIS P 8116: 2000, the kraft paper is used in the vertical direction (MD direction) and the horizontal direction (MD direction). The tear strength in the CD direction) was measured. The specific tear strength of the kraft paper in the vertical direction (MD direction) and the horizontal direction (CD direction) was determined by dividing each tear strength by the basis weight.
- TEAI Specific tensile energy absorption
- Air permeability resistance The air permeability resistance of kraft paper was measured by a method specified in JIS P 8117: 2009 with an Oken type testing machine (manufactured by Asahi Seiko Co., Ltd., digital type Oken type air permeability / smoothness testing machine).
- Kraft paper was processed into a bottom bladder bag with a foldless valve specified in JIS Z 1505: 2004 having a height of 370 mm, a depth of 95 mm and a width of 320 mm, and 25 kg of cement was filled by air blowing. Based on JIS Z 0217: 1998, the cement-filled bag was dropped horizontally from a height of 1.2 m, and the number of times until the bag was broken was counted and evaluated according to the following criteria. ⁇ : The number of times until the bag is broken is 10 times or more. ⁇ : The number of times until the bag is broken is 8 times or more and 9 times or less. X: The number of times until the bag is broken is 7 times or less.
- Adhesiveness A (adhesiveness) Cut the kraft paper of each example into a width of 30 mm and a length of 150 mm, and thinly stretch 0.3 mL of water-soluble glue (Lifebond P-8100 manufactured by Niei Kako Co., Ltd., concentration 48% by mass) to a width of 7 mm and a length of 10 cm. It was applied to the part of, and other kraft papers of the same example were layered and glued. Three sets of these were stacked, a weight of 5 kg was placed on the top, and the mixture was left for a day, and then the adhesive portion was tried to be peeled off and evaluated. ⁇ : The glued parts of the kraft paper are completely adhered to each other. ⁇ : Mostly adhered, but some parts are not adhered. X: Almost no adhesion and easy peeling.
- Glue suitability B (glue permeability) Cut the kraft paper of each example into 50 mm squares, and apply 1.5 mL of water-soluble glue (Lifebond P-8100 manufactured by Niei Kako Co., Ltd., concentration 48% by mass) to the central part of the kraft paper with an area of 3 cm 2. Then, other kraft papers of the same example were layered and glued. Three sets of these were stacked, a weight of 5 kg was placed on the top, and the mixture was left for 6 hours, and then the penetration of the glue was evaluated. ⁇ : The glue has not penetrated to the opposite surface of the glued part. ⁇ : The glue has penetrated slightly to the opposite surface of the glued portion, but no stickiness is observed on the opposite surface. X: The glue has penetrated into the opposite surface of the glued part and is adhered to other paper.
- Kraft pulp (1) Unbleached coniferous kraft pulp (NUKP) made from Douglas fir.
- Kraft pulp (2) Unbleached coniferous kraft pulp (NUKP) made from domestic pine.
- Kraft pulp (3) Unbleached coniferous kraft pulp (NUKP) made from domestic cedar.
- a synthetic sizing agent (Size Pine MXE2, manufactured by Arakawa Chemical Industries, Ltd.) was added to the pulps having the formulations shown in Tables 1 and 2 as an internal chemical in an amount of 0.15% by mass based on the solid content of the pulp. Then, it was beaten at 80 ° C. using a deluxe finer. The characteristics of the pulp after beating are shown in Tables 1 and 2.
- a sulfuric acid band was added to 1.2% by mass based on the solid content of the pulp, and cationized starch was added to the pulp after beating as an internal preparation in an amount of 0.9% by mass based on the solid content of the pulp.
- the evaluation results of the kraft paper of each example are shown in Tables 1 and 2. As shown in Tables 1 and 2, the kraft papers of Examples had low air permeation resistance and excellent air permeability. Further, the bag obtained from the kraft paper of the example had good filling property, bag breaking suitability, and drop impact characteristics, and had excellent strength. Further, the kraft paper of the example had good adhesiveness (excellent adhesiveness, and penetration of glue into other kraft papers under load was suppressed).
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Abstract
Description
そこで、本発明は、上記事情に鑑みて、強度を維持しつつ、さらに通気性を高めたクラフト紙とこれを用いたクラフト紙袋を提供することを課題とする。 Since kraft paper bags are sometimes used for transporting heavy objects, they need to be strong and durable. On the other hand, when filling powder, the kraft paper bag needs to have a certain degree of air permeability. In recent years, the speed of airflow filling has been increasing, so that kraft paper bags are required to have further improved air permeability.
Therefore, in view of the above circumstances, it is an object of the present invention to provide kraft paper having higher breathability while maintaining strength and a kraft paper bag using the same.
[1]クラフトパルプを主成分とするクラフト紙であって、
該クラフト紙をJIS P 8220:2012に記載のパルプ離解法により離解して得られる離解パルプのJIS P 8121-2:2012に準拠して測定されるカナダ標準ろ水度は700mL以上であり、JIS P 8120:1998に準拠して測定される繊維粗度は0.200mg/m以上である、クラフト紙。
[2]JIS P 8116:2000に準拠して測定される縦方向の比引裂強さが15.0mN・m2/g以上であり、横方向の比引裂強さが18.0mN・m2/g以上である、[1]に記載のクラフト紙。
[3]JIS P 8113:2006に準拠して測定される縦方向の引張破断伸びが8.0%以上であり、横方向の引張破断伸びが6.0%以上である、[1]又は[2]に記載のクラフト紙。
[4]JIS P 8113:2006に準拠して測定される縦方向の比引張エネルギー吸収量が2.5J/g以上であり、横方向の比引張エネルギー吸収量が2.3J/g以上である、[1]~[3]のいずれかに記載のクラフト紙。
[5]JIS P 8117:2009に準拠して測定される透気抵抗度が10秒以下である、[1]~[4]のいずれかに記載のクラフト紙。
[6]JIS P 8140:1998に準拠して測定される、温度23℃、接触時間60秒でのコッブ吸水度が15~28g/m2である、[1]~[5]のいずれかに記載のクラフト紙。
[7][1]~[6]のいずれかに記載のクラフト紙で構成されたクラフト紙袋。
[8]粉体収容用である[7]に記載のクラフト紙袋。 In order to achieve the above problems, the present invention has adopted the following configuration.
[1] Kraft paper containing kraft pulp as the main component.
The Canadian standard free water content measured in accordance with JIS P 811-2: 2012 of the disintegrated pulp obtained by disintegrating the kraft paper by the pulp disintegration method described in JIS P 8220: 2012 is 700 mL or more, and JIS Kraft paper having a fiber roughness of 0.200 mg / m or more as measured in accordance with P 8120: 1998.
[2] JIS P 8116: ratio tear strength in the longitudinal direction as measured according to 2000 is at 15.0mN · m 2 / g or more, lateral specific tear strength 18.0mN · m 2 / The kraft paper according to [1], which is g or more.
[3] The longitudinal tensile elongation at break measured in accordance with JIS P 8113: 2006 is 8.0% or more, and the lateral tensile elongation at break is 6.0% or more, [1] or [ 2] The kraft paper described in.
[4] The specific tensile energy absorption amount in the vertical direction measured in accordance with JIS P 8113: 2006 is 2.5 J / g or more, and the specific tensile energy absorption amount in the horizontal direction is 2.3 J / g or more. , The kraft paper according to any one of [1] to [3].
[5] The kraft paper according to any one of [1] to [4], wherein the air permeation resistance measured in accordance with JIS P 8117: 2009 is 10 seconds or less.
[6] Any of [1] to [5], which is measured in accordance with JIS P 8140: 1998 and has a Cobb water absorption of 15 to 28 g / m 2 at a temperature of 23 ° C. and a contact time of 60 seconds. Described kraft paper.
[7] A kraft paper bag made of the kraft paper according to any one of [1] to [6].
[8] The kraft paper bag according to [7] for storing powder.
[11]クラフトパルプを主成分とするクラフト紙であって、
JIS P 8124:2011に準拠して測定される坪量が70g/m2以上であり、
JIS P 8140:1998に準拠して測定される、温度23℃、接触時間60秒でのコッブ吸水度が15~28g/m2であり、
坪量に対するコッブ吸水度の比が0.18~0.35である、クラフト紙。
[12]JIS P 8116:2000に準拠して測定される縦方向の比引裂強さが15.0mN・m2/g以上であり、横方向の比引裂強さが18.0mN・m2/g以上である、[11]に記載のクラフト紙。
[13]JIS P 8113:2006に準拠して測定される縦方向の引張破断伸びが8.0%以上であり、横方向の引張破断伸びが6.0%以上である、[11]又は[12]に記載のクラフト紙。
[14]JIS P 8113:2006に準拠して測定される縦方向の比引張エネルギー吸収量が2.5J/g以上であり、横方向の比引張エネルギー吸収量が2.3J/g以上である、[11]~[13]のいずれかに記載のクラフト紙。
[15]JIS P 8117:2009に準拠して測定される透気抵抗度が10秒以下である、[11]~[14]のいずれかに記載のクラフト紙。
[16]クラフト紙をJIS P 8220:2012に記載のパルプ離解法により離解した場合、得られる離解パルプのJIS P 8121-2:2012に準拠して測定されるカナダ標準ろ水度は700mL以上であり、JIS P 8120:1998に準拠して測定される繊維粗度は0.200mg/m以上である、[11]~[15]のいずれかに記載のクラフト紙。
[17][11]~[16]のいずれかに記載のクラフト紙で構成されたクラフト紙袋。 In addition, the present invention may have the following configuration.
[11] Kraft paper containing kraft pulp as the main component.
The basis weight measured in accordance with JIS P 8124: 2011 is 70 g / m 2 or more.
Measured according to JIS P 8140: 1998, the Cobb water absorption at a temperature of 23 ° C. and a contact time of 60 seconds is 15 to 28 g / m 2 .
Kraft paper with a ratio of Cobb water absorption to basis weight of 0.18 to 0.35.
[12] JIS P 8116: ratio tear strength in the longitudinal direction as measured according to 2000 is at 15.0mN · m 2 / g or more, the ratio of the transverse tear strength of 18.0mN · m 2 / The kraft paper according to [11], which is g or more.
[13] The longitudinal tensile elongation at break measured in accordance with JIS P 8113: 2006 is 8.0% or more, and the lateral tensile elongation at break is 6.0% or more, [11] or [ 12] The kraft paper described in.
[14] The specific tensile energy absorption amount in the vertical direction measured in accordance with JIS P 8113: 2006 is 2.5 J / g or more, and the specific tensile energy absorption amount in the horizontal direction is 2.3 J / g or more. , [11] to [13].
[15] The kraft paper according to any one of [11] to [14], wherein the air permeation resistance measured in accordance with JIS P 8117: 2009 is 10 seconds or less.
[16] When kraft paper is disintegrated by the pulp disintegration method described in JIS P 8220: 2012, the Canadian standard freeness measured in accordance with JIS P 811-2: 2012 of the obtained disintegrated pulp is 700 mL or more. The kraft paper according to any one of [11] to [15], wherein the fiber roughness measured in accordance with JIS P 8120: 1998 is 0.200 mg / m or more.
[17] A kraft paper bag made of the kraft paper according to any one of [11] to [16].
本発明のクラフト紙は、クラフトパルプを主成分とする。本明細書において、クラフトパルプとは、水酸化ナトリウムと硫化ナトリウムを主成分とするアルカリ性薬剤を用いて木材を処理して得られたパルプである。クラフト紙における主成分とは、クラフト紙の全質量に対して50質量%以上を占める成分をいう。すなわち、クラフト紙の全質量に対するクラフトパルプの質量割合は、50質量%以上であることが好ましく、60質量%以上であることがより好ましく、70質量%以上であることがさらに好ましい。なお、クラフト紙の全質量に対するクラフトパルプの質量割合100質量%以下であることが好ましい。また、クラフト紙を構成する全パルプの質量(固形分)に占めるクラフトパルプの質量(固形分)の割合は、97質量%以上であることが好ましく、98質量%以上であることがより好ましい。なお、クラフト紙を構成する全パルプの質量(固形分)に占めるクラフトパルプの質量(固形分)の割合は、100質量%以下であることが好ましい。 [Kraft paper]
The kraft paper of the present invention contains kraft pulp as a main component. In the present specification, kraft pulp is pulp obtained by treating wood with an alkaline chemical containing sodium hydroxide and sodium sulfide as main components. The main component in kraft paper means a component that accounts for 50% by mass or more with respect to the total mass of kraft paper. That is, the mass ratio of kraft pulp to the total mass of kraft paper is preferably 50% by mass or more, more preferably 60% by mass or more, and further preferably 70% by mass or more. The mass ratio of kraft pulp to the total mass of kraft paper is preferably 100% by mass or less. Further, the ratio of the mass (solid content) of the kraft pulp to the mass (solid content) of the total pulp constituting the kraft paper is preferably 97% by mass or more, and more preferably 98% by mass or more. The ratio of the mass (solid content) of kraft pulp to the mass (solid content) of all pulp constituting the kraft paper is preferably 100% by mass or less.
ルンケル比は、平均繊維壁厚(繊維の細胞壁の厚さの平均)の2倍を、ルーメン径の平均直径で割った値である。ルーメン径の平均直径は、平均繊維幅から平均繊維壁厚の2倍を引くことにより求められる。すなわち、ルンケル比は、平均繊維壁厚と平均繊維幅から求められる値である。ルンケル比を求めるために必要な平均繊維壁厚と平均繊維幅は、繊維分析器(メッツォオートメーション社製、カヤーニファイバーラボver4.0)により測定することができる。 The fiber roughness of the disintegrated pulp can be adjusted by the runkel ratio of the raw material pulp, the copper value (Kα value) of the raw material pulp, the blade used for beating, the temperature at the time of beating, and the like.
The Runkel ratio is a value obtained by dividing twice the average fiber wall thickness (average of the cell wall thickness of fibers) by the average diameter of the lumen diameter. The average lumen diameter is determined by subtracting twice the average fiber wall thickness from the average fiber width. That is, the Runkel ratio is a value obtained from the average fiber wall thickness and the average fiber width. The average fiber wall thickness and average fiber width required to obtain the Runkel ratio can be measured by a fiber analyzer (Kajaani FiberLab ver4.0, manufactured by Mezzo Automation).
本発明のクラフト紙の製造方法は、木材チップを主原料にして、クラフト法で蒸解し、未晒クラフトパルプを得る工程と、この未晒クラフトパルプを叩解してパルプスラリーを得る工程と、パルプスラリーを抄紙する工程と、を含むことが好ましい。なお、このパルプスラリーには未晒クラフトパルプ以外のパルプが添加されていてもよい。また、パルプスラリーには、本発明の効果を損なわない範囲で上記の内添薬品が添加されていてもよい。 [Kraft paper manufacturing method]
The method for producing kraft paper of the present invention includes a step of using wood chips as a main raw material and steaming it by a kraft method to obtain unbleached kraft pulp, a step of beating the unbleached kraft pulp to obtain pulp slurry, and pulp. It is preferable to include a step of making a pulp of the slurry. In addition, pulp other than unbleached kraft pulp may be added to this pulp slurry. Further, the above-mentioned internal chemicals may be added to the pulp slurry as long as the effects of the present invention are not impaired.
本発明のクラフト紙袋は、上述したクラフト紙を製袋したものである。袋の形状に特に限定はないが、例えば、JIS Z 0102:2004に記載のひだなし開口式ミシン縫い袋、ひだなしバルブ付きミシン縫い袋等のミシン縫い袋や、ひだなし開口式底ばり袋、ひだなしバルブ付き底ばり袋等ののりばり袋が挙げられる。 [Craft paper bag]
The kraft paper bag of the present invention is a bag made from the above-mentioned kraft paper. The shape of the bag is not particularly limited. Examples include a glue bag such as a bottom bag with a foldless valve.
(ルンケル比)
離解パルプのルンケル比は、上記平均繊維幅と平均繊維壁厚から計算により求めた。ルンケル比は、平均繊維壁厚(繊維の細胞壁の厚さの平均)の2倍を、ルーメン径の平均直径で除することにより算出した。 [Measurement method, evaluation method]
(Runkel ratio)
The Runkel ratio of the dissociated pulp was calculated from the average fiber width and the average fiber wall thickness. The Runkel ratio was calculated by dividing twice the average fiber wall thickness (the average fiber cell wall thickness) by the average lumen diameter.
下記実施例および比較例で製造したクラフト紙をJIS P 8220:2012に記載のパルプ離解法により離解し、離解パルプを得た。離解パルプのフリーネスは、JIS P 8121-2:2012に規定される方法により測定した。 (Freeness of dissociated pulp)
The kraft paper produced in the following Examples and Comparative Examples was disintegrated by the pulp dissociation method described in JIS P 8220: 2012 to obtain dissociated pulp. The freeness of the disintegrated pulp was measured by the method specified in JIS P 811-2: 2012.
離解パルプのKα価は、JIS P 8211:2011に規定されている方法により測定した。 (Kα value)
The Kα value of the dissociated pulp was measured by the method specified in JIS P 8211: 2011.
下記実施例および比較例で製造したクラフト紙をJIS P 8220:2012に記載のパルプ離解法により離解し、離解パルプを得た。JIS P 8120:1998に準拠し、離解パルプを0.02質量%まで水で希釈したスラリーから25mL(絶乾パルプ5mg相当)を正確に取り分け、メッツォオートメーション社製、カヤーニファイバーラボver4.0を用いて、離解パルプの繊維粗度を測定した。 (Fiber roughness of disintegrated pulp)
The kraft paper produced in the following Examples and Comparative Examples was disintegrated by the pulp dissociation method described in JIS P 8220: 2012 to obtain dissociated pulp. In accordance with JIS P 8120: 1998, accurately separate 25 mL (equivalent to 5 mg of absolute dry pulp) from a slurry obtained by diluting dissociated pulp with water to 0.02% by mass, and use Kajaani FiberLab ver4.0 manufactured by Metso Automation Co., Ltd. The fiber roughness of the disintegrated pulp was measured.
JIS P 8124:2011に規定される方法に準拠してクラフト紙の坪量を測定した。続いてJIS P 8118:2014に規定される方法で、クラフト紙の厚さを測定した。坪量を紙厚で除した値を、クラフト紙の密度とした。 (Basis weight, density)
The basis weight of kraft paper was measured according to the method specified in JIS P 8124: 2011. Subsequently, the thickness of the kraft paper was measured by the method specified in JIS P 8118: 2014. The value obtained by dividing the basis weight by the paper thickness was taken as the density of kraft paper.
JIS P 8116:2000に規定される方法により、引裂試験機(東洋精機社製、エレメンドルフ引裂試験機(SA-W型))を用いて、クラフト紙の縦方向(MD方向)及び横方向(CD方向)の引裂強さを測定した。各々の引裂強さを坪量で除すことにより、クラフト紙の縦方向(MD方向)及び横方向(CD方向)の比引裂強さを求めた。 (Ratio tear strength)
Using a tear tester (Elemendorff tear tester (SA-W type) manufactured by Toyo Seiki Co., Ltd.) according to the method specified in JIS P 8116: 2000, the kraft paper is used in the vertical direction (MD direction) and the horizontal direction (MD direction). The tear strength in the CD direction) was measured. The specific tear strength of the kraft paper in the vertical direction (MD direction) and the horizontal direction (CD direction) was determined by dividing each tear strength by the basis weight.
JIS P 8113:2006に規定される方法により、横型引張試験機(L&W社製、CODE SE-064)を用いて、クラフト紙の縦方向(MD方向)及び横方向(CD方向)の引張破断伸びを測定した。 (Tensile breaking elongation)
Tensile breaking elongation of kraft paper in the vertical direction (MD direction) and the horizontal direction (CD direction) using a horizontal tensile tester (manufactured by L & W, CODE SE-064) by the method specified in JIS P 8113: 2006. Was measured.
JIS P 8113:2006に規定される方法により、横型引張試験機(L&W社製、CODE SE-064)を用いて、クラフト紙の縦方向(MD方向)及び横方向(CD方向)の引張エネルギー吸収量を測定した。各々の引張エネルギー吸収量を坪量で除すことにより、クラフト紙の縦方向(MD方向)及び横方向(CD方向)の比引張エネルギー吸収量(TEAI)を求めた。 (Specific tensile energy absorption (TEAI))
Absorption of tensile energy in the vertical direction (MD direction) and horizontal direction (CD direction) of kraft paper using a horizontal tensile tester (manufactured by L & W, CODE SE-064) by the method specified in JIS P 8113: 2006. The amount was measured. By dividing each tensile energy absorption amount by the basis weight, the specific tensile energy absorption amount (TEAI) of the kraft paper in the vertical direction (MD direction) and the horizontal direction (CD direction) was determined.
JIS P 8140:1998に規定される方法により、温度23℃、接触時間を60秒としクラフト紙のコッブ吸水度を測定した。 (Cobb water absorption (60 seconds))
The Cobb water absorption of kraft paper was measured at a temperature of 23 ° C. and a contact time of 60 seconds by the method specified in JIS P 8140: 1998.
JIS P 8117:2009に規定される方法により、王研式試験機(旭精工社製、デジタル型王研式透気度・平滑度試験機)でクラフト紙の透気抵抗度を測定した。 (Air permeability resistance)
The air permeability resistance of kraft paper was measured by a method specified in JIS P 8117: 2009 with an Oken type testing machine (manufactured by Asahi Seiko Co., Ltd., digital type Oken type air permeability / smoothness testing machine).
クラフト紙を、高さ370mm,奥行き95mm,幅320mmのJIS Z 1505:2004に規定されるひだなしバルブ付き底ばり袋に加工し、25kgまたは40kgのセメントを風送により5秒で充填した後の袋を、以下の基準でそれぞれ評価した。
◎:エアーが素早く抜け、破袋せずに充填が極めてよく行えた。
○:一部に破袋が見られたが使用上問題ない。
△:破袋が発生し使用上問題があった。
×:破袋が多く発生した。 (Fillability / bag breakability)
After processing kraft paper into a bottom bladder bag with a foldless valve specified in JIS Z 1505: 2004 with a height of 370 mm, a depth of 95 mm, and a width of 320 mm, and filling 25 kg or 40 kg of cement by air blowing in 5 seconds. The bags were evaluated according to the following criteria.
⊚: Air was released quickly, and filling was extremely good without breaking the bag.
◯: A broken bag was found in some parts, but there is no problem in use.
Δ: A bag was broken and there was a problem in use.
X: Many bag breaks occurred.
クラフト紙を、高さ370mm,奥行き95mm,幅320mmのJIS Z 1505:2004に規定されるひだなしバルブ付き底ばり袋に加工し、25kgのセメントを風送により充填した。セメントを充填した袋を、JIS Z 0217:1998に基づき、高さ1.2mから水平落下させ、破袋に至るまでの回数を数え、以下の基準で評価した。
◎:破袋に至るまでの回数が10回以上。
△:破袋に至るまでの回数が8回以上9回以下。
×:破袋に至るまでの回数が7回以下。 (Drop impact characteristics)
Kraft paper was processed into a bottom bladder bag with a foldless valve specified in JIS Z 1505: 2004 having a height of 370 mm, a depth of 95 mm and a width of 320 mm, and 25 kg of cement was filled by air blowing. Based on JIS Z 0217: 1998, the cement-filled bag was dropped horizontally from a height of 1.2 m, and the number of times until the bag was broken was counted and evaluated according to the following criteria.
⊚: The number of times until the bag is broken is 10 times or more.
Δ: The number of times until the bag is broken is 8 times or more and 9 times or less.
X: The number of times until the bag is broken is 7 times or less.
各例のクラフト紙を幅30mm、長さ150mmにカットし、0.3mLの水溶性糊(日栄化工株式会社製ライフボンドP-8100、濃度48質量%)を薄く伸ばして幅7mm、長さ10cmの部分に塗布し、同じ例の他のクラフト紙を重ねて接着した。これを3セット重ね、上から5kgの重りをのせて、一日放置した後、接着部分の剥離を試み評価した。
◎:糊付けした部分のクラフト紙同士が完全に接着している。
△:概ね接着しているが、一部接着していない部分がある。
×:ほとんど接着しておらず、容易に剥離できる。 (Adhesiveness A (adhesiveness))
Cut the kraft paper of each example into a width of 30 mm and a length of 150 mm, and thinly stretch 0.3 mL of water-soluble glue (Lifebond P-8100 manufactured by Niei Kako Co., Ltd., concentration 48% by mass) to a width of 7 mm and a length of 10 cm. It was applied to the part of, and other kraft papers of the same example were layered and glued. Three sets of these were stacked, a weight of 5 kg was placed on the top, and the mixture was left for a day, and then the adhesive portion was tried to be peeled off and evaluated.
⊚: The glued parts of the kraft paper are completely adhered to each other.
Δ: Mostly adhered, but some parts are not adhered.
X: Almost no adhesion and easy peeling.
各例のクラフト紙を50mm角にカットし、1.5mLの水溶性糊(日栄化工株式会社製ライフボンドP-8100、濃度48質量%)をクラフト紙の中央部の面積3cm2の部分に塗布し、同じ例の他のクラフト紙を重ねて接着した。これを3セット重ね、上から5kgの重りをのせて、6時間放置した後、糊の浸透を評価した。
◎:糊付けした部分の反対面へ糊が浸透していない。
△:糊付けした部分の反対面へ糊がやや浸透しているが、反対面においてべたつきは見られない。
×:糊付けした部分の反対面へ糊が浸透しており、他の紙と接着している。 (Glue suitability B (glue permeability))
Cut the kraft paper of each example into 50 mm squares, and apply 1.5 mL of water-soluble glue (Lifebond P-8100 manufactured by Niei Kako Co., Ltd., concentration 48% by mass) to the central part of the kraft paper with an area of 3 cm 2. Then, other kraft papers of the same example were layered and glued. Three sets of these were stacked, a weight of 5 kg was placed on the top, and the mixture was left for 6 hours, and then the penetration of the glue was evaluated.
⊚: The glue has not penetrated to the opposite surface of the glued part.
Δ: The glue has penetrated slightly to the opposite surface of the glued portion, but no stickiness is observed on the opposite surface.
X: The glue has penetrated into the opposite surface of the glued part and is adhered to other paper.
クラフトパルプ(1):ダグラスファーを原料とする針葉樹未晒クラフトパルプ(NUKP)。
クラフトパルプ(2):国内松を原料とする針葉樹未晒クラフトパルプ(NUKP)。
クラフトパルプ(3):国内杉を原料とする針葉樹未晒クラフトパルプ(NUKP)。 [Raw material pulp]
Kraft pulp (1): Unbleached coniferous kraft pulp (NUKP) made from Douglas fir.
Kraft pulp (2): Unbleached coniferous kraft pulp (NUKP) made from domestic pine.
Kraft pulp (3): Unbleached coniferous kraft pulp (NUKP) made from domestic cedar.
表1及び表2に記載した配合のパルプに、内添薬品として合成サイズ剤(荒川化学工業製、サイズパインMXE2)を、パルプの固形分に対して0.15質量%添加した。その後、デラックスファイナーを用いて80℃で叩解した。叩解後のパルプの特性を表1及び表2に示した。
叩解後のパルプに、内添薬品として、硫酸バンドをパルプの固形分に対して1.2質量%、乾燥紙力増強剤としてカチオン化澱粉をパルプの固形分に対して0.9質量%およびポリアクリルアミドをパルプの固形分に対して1.0質量%添加した後、オープントップフォーマー式抄紙機を用いて抄紙(1層抄き)し、各例のクラフト紙を得た。各例のクラフト紙とその離解パルプの特性を表1及び表2に示した。 [Manufacturing of kraft paper]
A synthetic sizing agent (Size Pine MXE2, manufactured by Arakawa Chemical Industries, Ltd.) was added to the pulps having the formulations shown in Tables 1 and 2 as an internal chemical in an amount of 0.15% by mass based on the solid content of the pulp. Then, it was beaten at 80 ° C. using a deluxe finer. The characteristics of the pulp after beating are shown in Tables 1 and 2.
In the pulp after beating, as an internal chemical, a sulfuric acid band was added to 1.2% by mass based on the solid content of the pulp, and cationized starch was added to the pulp after beating as an internal preparation in an amount of 0.9% by mass based on the solid content of the pulp. After 1.0 mass% of polyacrylamide was added to the solid content of the pulp, paper was made (one layer) using an open top former paper machine to obtain kraft paper of each example. The characteristics of the kraft paper of each example and its disintegrated pulp are shown in Tables 1 and 2.
各例のクラフト紙の評価結果を表1及び表2に示す。表1及び表2に示すように、実施例のクラフト紙は透気抵抗度が低く、通気性に優れていた。また、実施例のクラフト紙で得られた袋は、充填性・破袋適性、落下衝撃特性が共に良好であり、優れた強度を有していた。さらに、実施例のクラフト紙は、糊付け適性も良好であった(接着性に優れ、加重時の他のクラフト紙への糊の浸透が抑制されていた)。 [Evaluation]
The evaluation results of the kraft paper of each example are shown in Tables 1 and 2. As shown in Tables 1 and 2, the kraft papers of Examples had low air permeation resistance and excellent air permeability. Further, the bag obtained from the kraft paper of the example had good filling property, bag breaking suitability, and drop impact characteristics, and had excellent strength. Further, the kraft paper of the example had good adhesiveness (excellent adhesiveness, and penetration of glue into other kraft papers under load was suppressed).
Claims (8)
- クラフトパルプを主成分とするクラフト紙であって、
該クラフト紙をJIS P 8220:2012に記載のパルプ離解法により離解した場合、得られる離解パルプのJIS P 8121-2:2012に準拠して測定されるカナダ標準ろ水度は700mL以上であり、JIS P 8120:1998に準拠して測定される繊維粗度は0.200mg/m以上である、クラフト紙。 Kraft paper whose main component is kraft pulp
When the kraft paper is disintegrated by the pulp disintegration method described in JIS P 8220: 2012, the Canadian standard freeness measured in accordance with JIS P 8121-2: 2012 of the obtained disintegrated pulp is 700 mL or more. Kraft paper having a fiber roughness of 0.200 mg / m or more, measured in accordance with JIS P 8120: 1998. - JIS P 8124:2011に準拠して測定される坪量が70g/m2以上であり、
JIS P 8140:1998に準拠して測定される、温度23℃、接触時間60秒でのコッブ吸水度が15~28g/m2であり、
前記坪量に対する前記コッブ吸水度の比が0.18~0.35である、請求項1に記載のクラフト紙。 The basis weight measured in accordance with JIS P 8124: 2011 is 70 g / m 2 or more.
Measured according to JIS P 8140: 1998, the Cobb water absorption at a temperature of 23 ° C. and a contact time of 60 seconds is 15 to 28 g / m 2 .
The kraft paper according to claim 1, wherein the ratio of the water absorption of the cobb to the basis weight is 0.18 to 0.35. - JIS P 8116:2000に準拠して測定される縦方向の比引裂強さが15.0mN・m2/g以上であり、横方向の比引裂強さが18.0mN・m2/g以上である、請求項1又は2に記載のクラフト紙。 When the specific tear strength in the vertical direction measured in accordance with JIS P 8116: 2000 is 15.0 mN ・ m 2 / g or more and the specific tear strength in the horizontal direction is 18.0 mN ・ m 2 / g or more. The kraft paper according to claim 1 or 2.
- JIS P 8113:2006に準拠して測定される縦方向の引張破断伸びが8.0%以上であり、横方向の引張破断伸びが6.0%以上である、請求項1~3のいずれか一項に記載のクラフト紙。 Any of claims 1 to 3, wherein the tensile elongation at break in the vertical direction measured in accordance with JIS P 8113: 2006 is 8.0% or more, and the tensile elongation at break in the lateral direction is 6.0% or more. The kraft paper described in item 1.
- JIS P 8113:2006に準拠して測定される縦方向の比引張エネルギー吸収量が2.5J/g以上であり、横方向の比引張エネルギー吸収量が2.3J/g以上である、請求項1~4のいずれか一項に記載のクラフト紙。 Claims that the specific tensile energy absorption amount in the vertical direction measured in accordance with JIS P 8113: 2006 is 2.5 J / g or more, and the specific tensile energy absorption amount in the horizontal direction is 2.3 J / g or more. The kraft paper according to any one of 1 to 4.
- JIS P 8117:2009に準拠して測定される透気抵抗度が10秒以下である、請求項1~5のいずれか一項に記載のクラフト紙。 The kraft paper according to any one of claims 1 to 5, wherein the air permeability resistance measured in accordance with JIS P 8117: 2009 is 10 seconds or less.
- 請求項1~6のいずれか一項に記載のクラフト紙で構成されたクラフト紙袋。 A kraft paper bag made of the kraft paper according to any one of claims 1 to 6.
- 粉体収容用である請求項7に記載のクラフト紙袋。 The kraft paper bag according to claim 7, which is for storing powder.
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KR1020217039769A KR20220004197A (en) | 2019-05-30 | 2020-05-21 | Kraft Paper and Kraft Paper Bags |
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JP2000054283A (en) * | 1999-07-14 | 2000-02-22 | Oji Paper Co Ltd | Kraft paper |
JP2006089889A (en) * | 2004-09-27 | 2006-04-06 | Daio Paper Corp | Heavy-duty packaging kraft paper and method for producing the same |
JP2010229564A (en) * | 2009-03-25 | 2010-10-14 | Daio Paper Corp | Kraft paper |
JP2013159866A (en) * | 2012-02-01 | 2013-08-19 | Daio Paper Corp | Kraft paper |
JP2013185260A (en) * | 2012-03-05 | 2013-09-19 | Daio Paper Corp | Kraft paper |
US20180127919A1 (en) * | 2016-11-01 | 2018-05-10 | International Paper Company | Process for producing increased bulk pulp fibers, pulp fibers obtained, and products incorporating same |
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JPH06222946A (en) | 1993-01-22 | 1994-08-12 | Hitachi Ltd | Integrated circuit and testing method for the same |
JP4549796B2 (en) | 2004-09-28 | 2010-09-22 | 大王製紙株式会社 | Fine coated wrapping paper |
JP5008541B2 (en) | 2007-12-10 | 2012-08-22 | 大王製紙株式会社 | Printing paper |
JP6198376B2 (en) | 2012-09-12 | 2017-09-20 | 日本製紙株式会社 | Kraft paper |
CA2918147A1 (en) | 2013-07-18 | 2015-01-22 | Nippon Paper Industries Co., Ltd. | Clupak paper |
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JP2000054283A (en) * | 1999-07-14 | 2000-02-22 | Oji Paper Co Ltd | Kraft paper |
JP2006089889A (en) * | 2004-09-27 | 2006-04-06 | Daio Paper Corp | Heavy-duty packaging kraft paper and method for producing the same |
JP2010229564A (en) * | 2009-03-25 | 2010-10-14 | Daio Paper Corp | Kraft paper |
JP2013159866A (en) * | 2012-02-01 | 2013-08-19 | Daio Paper Corp | Kraft paper |
JP2013185260A (en) * | 2012-03-05 | 2013-09-19 | Daio Paper Corp | Kraft paper |
US20180127919A1 (en) * | 2016-11-01 | 2018-05-10 | International Paper Company | Process for producing increased bulk pulp fibers, pulp fibers obtained, and products incorporating same |
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WO2023173148A1 (en) * | 2022-03-18 | 2023-09-21 | Baumit Beteiligungen Gmbh | Paper bag having bag contents |
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