WO2020241417A1 - Doublure pour carton et procédé de fabrication de doublure pour carton - Google Patents

Doublure pour carton et procédé de fabrication de doublure pour carton Download PDF

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Publication number
WO2020241417A1
WO2020241417A1 PCT/JP2020/019970 JP2020019970W WO2020241417A1 WO 2020241417 A1 WO2020241417 A1 WO 2020241417A1 JP 2020019970 W JP2020019970 W JP 2020019970W WO 2020241417 A1 WO2020241417 A1 WO 2020241417A1
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Prior art keywords
surface layer
pulp
liner
mass
waste paper
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PCT/JP2020/019970
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English (en)
Japanese (ja)
Inventor
佑太 桐原
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大王製紙株式会社
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Application filed by 大王製紙株式会社 filed Critical 大王製紙株式会社
Priority to CN202080031580.4A priority Critical patent/CN113748243B/zh
Publication of WO2020241417A1 publication Critical patent/WO2020241417A1/fr

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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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes

Definitions

  • the present invention relates to a corrugated board liner and a method for manufacturing a corrugated board liner.
  • corrugated cardboard liners have been used for corrugated cardboard sheets used in packaging containers for Southeast Asia. Corrugated cardboard liners are lighter than those made of wood or resin containers, and because they have cushioning properties, their contents are not easily damaged, so they are used in various fields including precision equipment.
  • Patent Document 1 As a multi-layer paper making used for such a packaging container for packing, for example, in Patent Document 1, a second layer, which is a middle layer of a paper base material having a first layer, a second layer, and a third layer in order, is described. Disclosed is a technique capable of obtaining a paper base material having excellent double-sided printing suitability and double-sided laminating suitability by increasing the density of the first layer and the third layer, which are the outer layers, rather than the density of the above. (See Patent Document 1). Here, it is disclosed that the suitability for printing and laminating can be improved by changing the characteristics of the density in each layer structure.
  • kraft paper In the kraft paper disclosed in Patent Document 2, when the kraft paper is processed into a bag and used, the kraft paper that rarely causes the bag to break is involved in the vertical and horizontal breaking stretches, and further, the vertical and horizontal directions.
  • Kraft paper having excellent elongation characteristics and strength characteristics is disclosed by using kraft paper manufactured so that the breaking elongation and the like of the paper have a specific relationship.
  • kraft pulp is viscous beaten so that the pulp slurry concentration is 4.0 to 4.5% by weight and the weight average fiber length is 2.3 to 4.0 mm, and the disintegration freeness is 600 ml to 680 ml.
  • kraft pulp By making the kraft pulp into paper, it is possible to impart high air permeability to the paper support while maintaining the strength of the paper support within the JIS standard, and the raw material cost can be reduced with a low rice tsubo and the manufacturing cost. Kraft paper for heavy wrapping that can reduce the amount of waste is disclosed.
  • corrugated board liners have excellent impact resistance and resistance during transportation and in hot and humid environments. It is required to improve the impact resistance.
  • corrugated board liner As a method of improving the impact resistance of a corrugated board liner, it is conceivable to use a large amount of a paper strength enhancer to improve the paper strength. In such a case, the entire corrugated board liner becomes hard and there is a problem of line cracking. And soaring drug costs are a problem. In recent years, corrugated cardboard liners have also been required to recycle used paper and use environmentally friendly materials.
  • the present invention has been made based on the above circumstances, and provides a corrugated board liner capable of improving impact resistance during transportation on unpaved road surfaces and in a hot and humid environment while reusing used paper pulp.
  • the purpose is to provide.
  • the corrugated board liner according to the embodiment of the present invention includes at least a surface layer, a lower surface layer and a back surface layer, the surface layer contains coniferous kraft pulp, and the content of the coniferous kraft pulp in the surface layer is 80% by mass.
  • the lower surface layer contains coniferous kraft pulp and corrugated cardboard waste paper pulp
  • the content of the coniferous kraft pulp in the lower surface layer is 25% by mass or more and 35% by mass or less
  • the back surface layer is corrugated cardboard waste paper pulp and
  • the content of the corrugated cardboard waste paper pulp in the back surface layer is 30% by mass or more and 70% by mass or less
  • the content of the magazine waste paper pulp in the back surface layer is 30% by mass or more and 70% by mass or less.
  • the ratio of the basis weight of the surface layer to the total basis weight is 20% or more and 35% or less
  • the specific burst strength in an atmosphere of 60 ° C. and 80% RH is 3.45 kPa ⁇ m 2 / g or more. is there.
  • the method for producing a liner for cardboard is a method for producing a liner for cardboard having at least a front surface layer, a lower surface layer and a back surface layer, and is a method for producing a pulp raw material ejected onto a traveling wire.
  • the raw material pulp contains coniferous kraft pulp, corrugated waste paper pulp, magazine waste paper pulp or a combination thereof, and comprises a step of making raw material pulp using a paper machine.
  • the ratio J / W of the ejection speed J of the pulp raw material to the traveling speed W of the wire is larger than the J / W of the lower surface layer.
  • a corrugated cardboard liner capable of improving impact resistance during transportation on an unpaved road surface or in a hot and humid environment while reusing used paper pulp.
  • the corrugated board liner according to the embodiment of the present invention includes at least a front surface layer, a front surface layer, and a back surface layer.
  • the surface layer contains softwood kraft pulp, and the content of the softwood kraft pulp in the surface layer is 80% by mass or more.
  • the lower surface layer contains softwood kraft pulp and corrugated cardboard waste paper pulp, and the content of the softwood kraft pulp in the lower surface layer is 25% by mass or more and 35% by mass or less.
  • the back surface layer contains corrugated cardboard waste paper pulp and magazine waste paper pulp
  • the content of the corrugated cardboard waste paper pulp in the back surface layer is 30% by mass or more and 70% by mass or less
  • the content of the magazine waste paper pulp in the back surface layer is 30% by mass or more and 70% by mass or less
  • the ratio of the basis weight of the surface layer to the total basis weight is 20% or more and 35% or less.
  • the corrugated board liner has a specific burst strength of 3.45 kPa ⁇ m 2 / g or more in an atmosphere of 60 ° C. and 80% RH.
  • the surface layer contains softwood kraft pulp, and by increasing the content ratio of softwood kraft pulp in the surface layer located on the outermost surface side as a packing material for corrugated cardboard, the relative burst strength in a hot and humid environment Not only that, the surface strength can be improved in a hot and humid environment.
  • both corrugated cardboard waste paper pulp and magazine waste paper pulp as the main component of the raw material pulp of the back surface layer located on the backmost side as a packing material for corrugated cardboard, good adhesion is achieved while setting the degree of bump size low. It is possible to improve the relative burst strength in a hot and humid environment.
  • the lower layer of the surface contains softwood kraft pulp and corrugated cardboard waste paper pulp, and the content of the corrugated cardboard waste paper pulp is increased within the above range, so that the waste paper pulp can be reused and the temperature and humidity are high. It is possible to improve the relative burst strength in the environment of. Furthermore, since the surface layer occupies 20% to 35% of the total basis weight of the corrugated board liner, it is possible to maintain impact resistance and ensure the flexibility and cushioning property of the corrugated board liner, and the high temperature and humidity of the corrugated board liner.
  • the specific burst strength in the above environment can be 3.45 kPa ⁇ m 2 / g or more.
  • corrugated cardboard liner it is possible to provide a corrugated cardboard liner that can withstand an impact during transportation on an unpaved road surface and can exhibit excellent impact resistance even in a high temperature and high humidity environment. Further, according to the present invention, it is possible to obtain a corrugated cardboard liner having excellent box-making properties.
  • Such corrugated cardboard liners are preferably used especially for corrugated cardboard sheets used in packaging containers for packaging for Southeast Asia.
  • the front surface layer and the back surface layer contain a sizing agent, and the degree of bump size of the front surface layer and the back surface layer at a measurement time of 2 minutes is 10 g / m 2 or more and 50 g / m 2 or less.
  • the front surface layer and the back surface layer contain a sizing agent, and the degree of bump size of the front surface layer and the back surface layer in the measurement time of 2 minutes is within the above range, so that the corrugated cardboard can be used in a hot and humid environment. Humidity in the liner can be suppressed, and the quality of the corrugated board liner can be maintained.
  • the surface layer and the lower surface layer contain a paper strength enhancer, and the amount of the paper strength enhancer added to the lower surface layer is larger than the amount added to the surface layer.
  • the impact resistance can be improved by containing the paper strength enhancer, the flexibility of the paper layer may be impaired by containing the paper strength enhancer.
  • the corrugated board liner has a high content of softwood kraft pulp in the surface layer, which contributes to the improvement of impact resistance. For this reason, by increasing the amount of the paper strength enhancer added to the lower surface layer rather than the surface layer, it is possible to suppress breakage of the surface layer such as line cracks while ensuring flexibility, and during transportation on unpaved road surfaces. Impact resistance in a hot and humid environment can be further improved.
  • the density of the corrugated board liner is preferably 0.65 g / cm 3 or more and 0.85 g / cm 3 or less.
  • the density of the corrugated cardboard liner is in the above range, cushioning property can be imparted, and high impact resistance can be exhibited without adding a paper strength enhancer more than necessary.
  • the freeness of the dissociated pulp dissociated in accordance with JIS-P8220 is 420 ml or more and 460 ml or less.
  • the corrugated board liner can improve the box-making suitability while maintaining the specific burst strength in a high temperature and high humidity environment.
  • the method for producing a liner for cardboard is a method for producing a liner for cardboard having at least a front surface layer, a lower surface layer and a back surface layer, and is a method for producing a pulp raw material ejected onto a traveling wire.
  • the raw material pulp contains coniferous kraft pulp, corrugated waste paper pulp, magazine waste paper pulp or a combination thereof, and comprises a step of making raw material pulp using a paper machine.
  • the ratio J / W of the ejection speed J of the pulp raw material to the traveling speed W of the wire is larger than the J / W of the lower surface layer.
  • the method for producing a liner for corrugated board includes a step of papermaking a raw material pulp containing coniferous kraft pulp, corrugated cardboard waste paper pulp, magazine waste paper pulp or a combination thereof, and the wire in the papermaking process of the front surface layer and the back surface layer.
  • a good fiber orientation ratio can be obtained. As a result, it is possible to improve the impact resistance during transportation on an unpaved road surface or in a hot and humid environment.
  • the corrugated board liner includes at least a front surface layer, a lower surface layer, and a back surface layer in this order. Further, the corrugated cardboard liner may have a single layer or a plurality of layers between the lower surface layer and the back surface layer. That is, the corrugated board liner may be at least three or more layers of multi-layer paper, and in the case of four or more layers of multi-layer paper, a second lower surface layer is provided between the lower surface layer and the back surface layer. It is preferable that the configuration is provided with a second back surface layer between the lower surface layer and the back surface layer.
  • the lower surface layer, the back surface layer, or a combination thereof has a multi-layer structure, and by adopting such a structure, the corrugated board liner enhances the flexibility of the paper layer, and is suitable for box making and impact resistance. It is possible to improve the sex.
  • the surface layer contains softwood kraft pulp (NUKP).
  • the lower limit of the content of the softwood kraft pulp in the surface layer is 80% by mass, preferably 90% by mass.
  • the surface layer contains softwood kraft pulp and corrugated cardboard waste paper pulp, and by increasing the content ratio of softwood kraft pulp in the surface layer located on the outermost surface side as a packing material for corrugated cardboard, the relative burst strength in a hot and humid environment Not only that, the surface strength can be improved in a hot and humid environment. If the content of softwood kraft pulp in the surface layer is less than 80%, it may be difficult to secure the desired impact resistance.
  • the content of softwood kraft pulp in the surface layer is less than 80%, the content of long fibers is reduced, so that the strength of the surface layer is lowered and there is a possibility that rule cracking is likely to occur. From the viewpoint of recyclability, it is preferable to use used paper pulp in a range of less than 20% and not lowering impact resistance.
  • the lower surface layer contains softwood kraft pulp (NUKP) and corrugated cardboard waste paper pulp.
  • the lower limit of the content of the softwood kraft pulp in the lower layer of the surface is 25% by mass, more preferably 30% by mass.
  • the upper limit of the content of the softwood kraft pulp is 35% by mass, preferably 34% by mass.
  • the lower layer of the surface contains softwood kraft pulp and corrugated cardboard waste paper pulp, and by increasing the content of corrugated cardboard waste paper pulp with the content of the softwood kraft pulp in the above range, the waste paper pulp can be reused in a hot and humid environment. The relative burst strength underneath can be improved.
  • the back surface layer contains corrugated cardboard waste paper pulp and magazine waste paper pulp.
  • the back layer may further contain softwood kraft pulp.
  • the lower limit of the content of the corrugated cardboard waste paper pulp on the back surface is 30% by mass, preferably 31% by mass.
  • the upper limit of the content of the corrugated cardboard waste paper pulp is 70% by mass, preferably 60% by mass.
  • the lower limit of the content of the used magazine pulp on the back surface is 30% by mass, preferably 50% by mass.
  • the upper limit of the content of the used magazine pulp is 70% by mass, preferably 60% by mass.
  • each layer of the corrugated cardboard liner can be used as other pulps such as tea waste paper, kraft envelope waste paper, newspaper waste paper, leaflet waste paper, office waste paper, and upper white waste paper.
  • Decomposed waste paper pulp, deinking / deinking waste paper pulp, deinking / bleaching waste paper pulp, etc. produced from Kent waste paper, structural waste paper, ground ticket waste paper, etc. can be used.
  • mechanical pulp such as crushed wood pulp (GP), thermomechanical pulp (TMP), and bleached chemithermomechanical pulp (BCTMP) may be used.
  • a sizing agent it is preferable to add a sizing agent to each layer of the corrugated board liner. Since each layer of the corrugated board liner contains a sizing agent, the durability of the corrugated cardboard liner against humidity can be enhanced in a high temperature and high humidity environment, and the quality of the corrugated board liner can be maintained.
  • the sizing agent include styrene-based sizing agents, alkyl ketene dimers (AKD), alkenyl succinic anhydride (ASA), neutral rosin sizing agents, and rosin sizing agents. Of these, rosin sizing agents are preferred.
  • the rosin sizing agent is not particularly limited, and those known in the papermaking field can be used.
  • rosin-based substances include fortified rosins obtained by modifying rosins such as gum rosin, wood rosin, and tall oil rosin with ⁇ , ⁇ -unsaturated carboxylic acids such as fumaric acid, maleic acid, and acrylic acid, or anhydrides thereof.
  • rosin esters obtained by reacting rosins with polyhydric alcohols such as glycerin, trimethylolethane, trimethylolpropane, pentaerythritol, and diglycerin can be mentioned.
  • the rosin-based sizing agent includes those obtained by emulsifying these alone or a mixture thereof, and those obtained by emulsifying alone and then mixing them. Further, the above-mentioned emulsified product to which various polymers are added in order to further improve the size expression is also included.
  • the solid content is preferably 0.50 kg / pulp t, more preferably 1.50 kg / pulp t.
  • the solid content is preferably 5.00 kg / pulp t, and more preferably 4.00 kg / pulp t.
  • Paper power enhancer It is preferable to add a paper strength enhancer to each layer of the corrugated board liner. By adding the paper strength enhancer, the waste paper is exhausted by the recycling treatment, and the bond between the fibers of the corrugated cardboard waste paper pulp and the magazine waste paper pulp made of relatively flat pulp fibers is strengthened. Therefore, at 60 ° C. and 80% RH. The relative burst strength in an atmosphere can be further improved.
  • the paper strength enhancer examples include starch-based paper strength enhancers, acrylamide-based paper strength enhancers, vinyl alcohol-based paper strength enhancers, amide epoxy-based paper strength enhancers, and among these, acrylamide-based paper strength enhancers. Is preferable. More preferably, an amphoteric polyacrylamide resin-based paper strength enhancer is preferable.
  • Amphoteric polyacrylamide is a polymer of a cationic monomer and an anionic monomer with acrylamide, and is directly fixed to pulp fibers via its own cationic group. Another characteristic of amphoteric polyacrylamide resin-based paper strength enhancers is that the molecular structure and molecular weight can be controlled.
  • the amount of the paper strength enhancer added to the lower surface layer is larger than the amount added to the surface layer.
  • the impact resistance can be improved by containing the paper strength enhancer, the flexibility of the paper layer may be impaired by containing the paper strength enhancer.
  • the corrugated board liner contains a large amount of softwood kraft pulp that contributes to the improvement of impact resistance in the surface layer. For this reason, by increasing the amount of the paper strength enhancer added to the lower surface layer rather than the surface layer, it is possible to suppress breakage of the surface layer such as line cracks while ensuring flexibility, and during transportation on unpaved road surfaces. Impact resistance in a hot and humid environment can be further improved. Further, since the amount of the paper strength enhancer added to the back surface layer is also larger than the amount added to the front surface layer, the impact resistance in a hot and humid environment can be further improved.
  • the solid content is preferably 0.40 kg / pulp t, more preferably 0.8 kg / pulp t.
  • the solid content is preferably 9.0 kg / pulp t, more preferably 8.0 kg / pulp t.
  • the pulp raw material residue may adhere to the doctor blade used for peeling the wet paper attached to the roll, and the quality of the surface layer may be deteriorated.
  • the solid content is preferably 6.0 kg / pulp t, more preferably 6.4 kg / pulp t.
  • the upper limit of the amount of the paper strength enhancer added to the lower surface layer and the back surface layer is preferably 8.0 kg / pulp t in terms of solid content, and more preferably 7.0 kg / pulp t.
  • the corrugated board liner composed of each layer such as the front surface layer, the lower surface layer, the middle layer, and the back surface layer may contain various papermaking additives as long as the effects intended by the present invention are not impaired.
  • yield improvers for example, yield improvers, pigment dispersants, pH adjusters, thickeners, fluidity improvers, defoamers, defoamers, mold release agents, penetrants, UV absorbers, antioxidants, preservatives, antiseptic Biagents, defoamers, pitch control agents, slime control agents, chemical fixing agents such as sulfuric acid bands, water resistant agents such as polyamide, polyamine, epichlorohydrin, fillers such as clay, talc, calcium carbonate, basic dyes, acidic dyes , Known additives such as anionic direct dyes and cationic direct dyes can be added alone or in combination of two or more.
  • Basis weight is measured according to JIS-P8124 (2011).
  • the total basis weight of the corrugated board liner is preferably 120 g / m 2 to 250 g / m 2 , more preferably 130 g / m 2 to 240 g / m 2. ..
  • the basis weight of the back surface layer constituting the corrugated board liner is preferably 25 g / m 2 to 115 g / m 2 , and more preferably 30 g / m 2 to 110 g / m 2 .
  • the basis weight of the surface layer is preferably 38 g / m 2 to 52 g / m 2 , and more preferably 40 g / m 2 to 50 g / m 2 .
  • the basis weight of the lower surface layer is preferably 20 g / m 2 to 85 g / m 2 , and more preferably 39 g / m 2 to 80 g / m 2 .
  • the moldability at the time of box making can be improved, and the contents are filled after molding even in a high temperature and high humidity environment. It is possible to prevent damage to the packaging container when the product is used.
  • the lower limit of the ratio of the basis weight of the surface layer to the total basis weight is 20%, preferably 21%.
  • the upper limit of the ratio of the basis weight of the surface layer to the total basis weight is 35%, preferably 32%.
  • the density of the corrugated board liner As the lower limit of the density of the corrugated board liner, 0.65 g / cm 3 is preferable, and 0.67 g / cm 3 is more preferable. As the upper limit of the paper thickness, 0.85 g / cm 3 is preferable, and 0.80 g / cm 3 is more preferable. When the density of the corrugated cardboard liner is in the above range, cushioning property can be imparted, and high impact resistance can be exhibited without adding a paper strength enhancer more than necessary. Further, it is preferable that the density of the lower surface layer is smaller than the density of the front surface layer and the density of the back surface layer.
  • the density of the lower surface layer By making the density of the lower surface layer smaller than the density of the front surface layer and the density of the back surface layer, the impact resistance in a hot and humid environment can be further improved.
  • the lower limit of the table lower density preferably 0.48g / cm 3, 0.50g / cm 3 is more preferable.
  • As the upper limit of the density of the lower surface layer 0.95 g / cm 3 is preferable, and 0.82 g / cm 3 is more preferable.
  • Paper thickness Paper thickness is measured in accordance with "Paper and Paperboard-Thickness and Density Test Method" described in JIS-P8118 (2014).
  • the total paper thickness of the corrugated board liner of the present invention is preferably 178 ⁇ m to 370 ⁇ m, and more preferably 180 ⁇ m to 360 ⁇ m.
  • the paper thickness of the back surface layer constituting the corrugated board liner is preferably 38 ⁇ m to 145 ⁇ m, and more preferably 40 ⁇ m to 140 ⁇ m.
  • the paper thickness of the lower surface layer is preferably 45 ⁇ m to 165 ⁇ m, and more preferably 49 ⁇ m to 160 ⁇ m.
  • the total paper thickness of the layers constituting the lower surface layer is preferably in the above range.
  • the paper thickness of the surface layer is preferably 52 ⁇ m to 62 ⁇ m, and more preferably 53 ⁇ m to 60 ⁇ m.
  • the degree of bump size is measured with a measurement time of 2 minutes in accordance with JIS-P8140 (1998).
  • As the lower limit of the bump size of the corrugated board liner 10 g / m 2 is preferable, and 20 g / m 2 is more preferable. If the hump size of the corrugated board liner is less than the above lower limit, the humidity in the corrugated board liner may not be sufficiently suppressed in a hot and humid environment, and poor bonding may occur during processing into a paper container or the like. There is a risk of inviting.
  • the upper limit of Kobusaizu degree of the corrugating liner preferably 50g / m 2, 40g / m 2 is more preferable.
  • the corrugated board liner When the degree of bump size of the corrugated board liner is equal to or greater than the above upper limit, the corrugated board liner may cause wrinkles or wrinkles due to moisture absorption.
  • the degree of bump size of the front surface layer and the back surface layer in the measurement time of 2 minutes is within the above range, the humidity in the corrugated board liner can be suppressed in a hot and humid environment, and the quality of the corrugated cardboard liner can be maintained. Can be planned. In order to maintain the quality of the corrugated board liner in a hot and humid environment, it is necessary to suppress the increase in humidity in the corrugated board liner and improve the adhesiveness of the back layer, so the degree of bump size is set high. I needed it.
  • both corrugated cardboard waste paper pulp and magazine waste paper pulp as the main component of the raw material pulp of the back layer, it has good adhesion while setting the degree of bump size low, and it bursts in a high temperature and humidity environment.
  • the strength can be improved.
  • the specific burst strength is specified in JIS-P8131 (2009).
  • the specific burst strength is a value obtained by dividing the burst strength of paper expressed in kilopascals (kPa) units measured in accordance with the above JIS-P8131 (2009) by the above basis weight. 60 ° C. of the corrugating liner, the lower limit of the ratio burst strength in an atmosphere of RH 80%, a 3.45kPa ⁇ m 2 / g, 3.80kPa ⁇ m 2 / g is more preferable.
  • the corrugated board liner can improve impact resistance during transportation on an unpaved road surface or in a hot and humid environment.
  • the above “60 ° C., 80% RH” is measured in accordance with JIS-P8111 (1998).
  • the corrugated board liner is made into dissociated pulp by dissociating the corrugated liner in accordance with the method for dissociating pulp of JIS-P82201 (2012), and the dissociated pulp is made into Canada of JIS-P8121-2 (2012).
  • the post-separation freeness (Canadian standard freeness: CSF) measured according to the standard freeness test method is preferably 420 ml or more and 460 ml or less. If the lower limit of the freeness of the disintegrated pulp of the corrugated board liner is less than 420 ml, the specific burst strength in a hot and humid environment may decrease. On the other hand, if the upper limit of the freeness of the disintegrated pulp exceeds 460 ml, the productivity may be lowered and the box-making suitability may be lowered due to the deterioration of the papermaking property.
  • the Canadian standard freeness of the surface layer of the corrugated board liner is preferably 480 ml or more and 600 ml or less.
  • the Canadian standard freeness of the lower surface layer is preferably 400 ml or more and 510 ml or less.
  • the Canadian standard freeness of the back layer is preferably 375 ml or more and 415 ml or less.
  • the method for manufacturing a corrugated board liner is a method for manufacturing a corrugated board liner including at least a front surface layer, a front surface layer, and a back surface layer.
  • the method for producing a corrugated board liner includes a step of making raw pulp using a paper machine. Further, it is preferable that the method for producing the corrugated board liner includes a step of beating the raw material pulp constituting each layer so as to obtain desired freeness.
  • the raw material pulp constituting each layer is beaten so as to have a desired freeness.
  • the raw material pulp contains softwood kraft pulp, corrugated cardboard waste paper pulp, magazine waste paper pulp, or a combination thereof.
  • additives corresponding to each paper layer are added to the slurry obtained by dispersing pulp fibers in water as necessary and mixed to prepare a paper material for each paper layer.
  • Papermaking process Next, using these raw material slurries, paper is made by assembling the surface layer, the lower surface layer, the back surface layer, etc. with a paper machine in the neutral region so that the pH of the corrugated board liner is 6 or more and 8 or less.
  • the raw material pulp is made using a paper machine that makes the pulp raw material ejected onto the traveling wire.
  • the paper machine is not particularly limited, and a known paper machine such as a long net paper machine, a circular net paper machine, a hybrid former, a gap former, or the like can be used, and a multilayer of three or more layers can be used. Paper is made at.
  • the ratio J / W of the ejection speed J of the pulp raw material to the traveling speed W of the wire in the papermaking process of the front surface layer and the back surface layer is larger than the J / W of the lower surface layer. Since the J / W of the front surface layer and the back surface layer is larger than the J / W of the lower surface layer, a good fiber orientation ratio can be obtained.
  • the fiber orientation ratio is a measure of the degree of fiber orientation (arrangement), and is in the vertical direction (on the paper machine) in the process of pulp fibers flowing out onto the wire of the paper machine, dehydrating, and forming a paper layer. It is a tendency to line up in the flow direction of pulp fibers.
  • the fiber orientation ratio the larger the value, the stronger the degree of arrangement.
  • softwood kraft pulp having high strength in the surface layer the specific burst strength can be improved, but the J / W ratio of the surface layer, the lower surface layer and the back surface layer, in other words, the surface layer, the lower surface layer and the back surface layer
  • a coating layer may be provided on the surface in order to improve printability after the papermaking process.
  • the smoothing treatment is preferably carried out, for example, by pressurizing a corrugated board liner between reels that can be pressurized.
  • the product can be printed by passing it through a machine calender in front of the winder and / or a super calender, gloss calender, soft nip calender, etc. The finish is applied.
  • the corrugated cardboard liner may have a single layer or a plurality of middle layers between the lower surface layer and the back surface layer.
  • the obtained corrugated board liner was dissociated in accordance with the pulp dissociation method of JIS-P8220-1 (2012) to obtain dissociated pulp, and this dissociated pulp was used as the Canadian standard freshness of JIS-P8121-2 (2012). Measured according to the test method.
  • Example 1 The raw materials listed in the table were added to the pulp slurry.
  • Examples 2 to 7 and Comparative Examples 1 to 5 Examples 2 to 6, Comparative Examples 1 to 5 and a reference corrugated cardboard liner were used in the same manner as in Example 1 except that the types of raw materials, the amount of addition and the physical property values were as shown in Tables 1 to 4. Obtained. In addition, "-" in Table 1 and Table 2 below indicates that the corresponding component was not used. In addition, Examples 2 to 6 include a second back surface layer.
  • the degree of bump size referred to in the present invention is a value measured by bringing water into contact with the surface of the front surface layer or the back surface layer on the side where the foil stamping printing is provided for 2 minutes.
  • Box-making suitability The box-making properties of the corrugated cardboard liners obtained in Examples and Comparative Examples were evaluated.
  • the box-making property in the following evaluation means that the box can be easily bent at the time of box-making and that the bent portion is not cracked.
  • ⁇ The box-making property is very good, and there is no problem in practical use.
  • ⁇ Good box-making property, no problem in practical use.
  • ⁇ The box-making property is slightly inferior, and there is a problem in practical use.
  • X Box-making property is significantly inferior, which is a practical problem.
  • Bursting strength and specific bursting strength The bursting strength in an atmosphere of 60 ° C. and 80% RH was measured in accordance with JIS-P8131 (2009), and then the bursting strength was divided by the above basis weight. The specific burst strength was calculated.
  • Impact resistance in a hot and humid environment A corrugated cardboard case is manufactured using the corrugated cardboard liners obtained in Examples and Comparative Examples, and the corrugated cardboard case is transported in a container under the condition of 60 ° C. and 80% RH. The condition of the corrugated cardboard case was visually judged. ⁇ : No distortion or holes are found in the corrugated cardboard case after transportation, and there is no problem in practical use.
  • ⁇ Although the corrugated cardboard case after transportation has distortion and holes only in the front liner, the contents are not damaged and the texture is impaired, but there is no problem in practical use. ⁇ : Distortion or holes that do not reach the back liner are seen in the corrugated cardboard case after transportation, and there is a high possibility that the contents will be damaged, which is a practical problem. X: The corrugated cardboard case after transportation is distorted or completely perforated, and there is a high possibility that the contents will be damaged, which is a practical problem.
  • the content of the coniferous kraft pulp in the front surface layer is 80% by mass or more
  • the content of the coniferous kraft pulp in the lower surface layer is 25% by mass or more and 35% by mass or less
  • the back surface layer is 30% by mass or more and 70% by mass or less
  • the content of used magazine paper pulp in the back surface layer is 30% by mass or more and 70% by mass or less
  • the basis weight of the surface layer with respect to the total basis weight examples 1 to 7 in which the ratio is 20% or more and 35% or less and the specific burst strength in an atmosphere of 60 ° C. and 80% RH is 3.45 kPa ⁇ m 2 / g or more are box-making suitability and box-making suitability. It had excellent impact resistance in a hot and humid environment.
  • Comparative Example 1 in which the content of the coniferous kraft pulp in the surface layer was less than 80% by mass and the specific burst strength was less than 3.45 kPa ⁇ m 2 / g, and the content of the coniferous kraft pulp in the lower surface layer was 25% by mass.
  • Comparative Example 2 in which the content of corrugated cardboard waste paper pulp in the back surface layer is less than 30% by mass and the specific burst strength is less than 3.45 kPa ⁇ m 2 / g, and the content of the coniferous kraft pulp in the lower surface layer is 25.
  • Comparative Example 3 having a specific burst strength of less than 3.45 kPa ⁇ m 2 / g and a specific burst strength of less than 3.45 kPa ⁇ m 2 / g
  • Comparative Example 4 having a specific burst strength of less than 3.45 kPa ⁇ m 2 / g
  • the content of corrugated waste paper pulp in the back surface layer in Comparative Example 5 in which the amount and the content of the used paper pulp of the magazine were less than 30% by mass, either the box-making suitability and the impact resistance in a high temperature and high humidity environment were inferior.
  • the corrugated cardboard liner of the present invention can be suitably used as a corrugated cardboard sheet or packaging bag used for a packaging packaging container, or a liner for a container for solid storage.
  • it is preferably used as a corrugated cardboard sheet used for packaging containers for Southeast Asia, and can also be used as industrial paper in various fields such as distribution fields in a hot and humid environment.

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Abstract

Cette doublure pour carton est pourvue au moins d'une couche de surface supérieure, d'une couche de subsurface et d'une couche de surface arrière. La couche de surface supérieure contient de la pâte de bois de résineux, et la teneur en pâte de bois de résineux dans la couche de surface supérieure est supérieure ou égale à 80 % en masse ; la couche de subsurface contient de la pâte de bois de résineux et de la pâte de maculature de carton et la teneur en pâte de bois de résineux dans la couche de subsurface est de 25 à 35 % en masse ; la couche de surface arrière contient de la pâte de maculature de carton et de la pâte de maculature de magazine, la teneur de la pâte de maculature de carton dans la couche de surface arrière est de 30 à 70 % en masse et la teneur de la pâte de maculature de magazine dans la couche de surface arrière est de 30 à 70 % en masse ; et le rapport du poids de base de la couche de surface supérieure au poids de base global est de 20 à 35 %, et l'indice d'éclatement dans une atmosphère de 80 % RH et à 60 °C est supérieur ou égal à 3,45 kPa * m2/g.
PCT/JP2020/019970 2019-05-24 2020-05-20 Doublure pour carton et procédé de fabrication de doublure pour carton WO2020241417A1 (fr)

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JP7454194B2 (ja) * 2020-12-24 2024-03-22 大昭和紙工産業株式会社 約１００重量％の古紙原料からなる製袋用原紙及びこれからつくられた紙袋、並びに製袋用原紙の製造方法
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CN113748243A (zh) 2021-12-03
TW202043050A (zh) 2020-12-01
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