WO2022004635A1 - 防水紙およびその製造方法 - Google Patents
防水紙およびその製造方法 Download PDFInfo
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- WO2022004635A1 WO2022004635A1 PCT/JP2021/024308 JP2021024308W WO2022004635A1 WO 2022004635 A1 WO2022004635 A1 WO 2022004635A1 JP 2021024308 W JP2021024308 W JP 2021024308W WO 2022004635 A1 WO2022004635 A1 WO 2022004635A1
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- paper
- waterproof
- water
- coating layer
- seconds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
- B65D65/38—Packaging materials of special type or form
- B65D65/42—Applications of coated or impregnated materials
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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
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/18—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising waxes
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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
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
- D21H19/14—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12
- D21H19/20—Coatings without pigments applied in a form other than the aqueous solution defined in group D21H19/12 comprising macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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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
- D21H19/00—Coated paper; Coating material
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
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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
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/16—Sizing or water-repelling agents
Definitions
- the present invention relates to waterproof paper and a method for manufacturing the same.
- paper containers and packaging materials are based on a paper base material, so that water vapor and the like are extremely easy to permeate, and the strength may decrease due to the moisture generated from the packaged articles. ..
- water vapor and the like are extremely easy to permeate, and the strength may decrease due to the moisture generated from the packaged articles. ..
- water vapor and the like invading from the outside.
- paper containers and packaging materials when transporting ice together, such as in chilled products, paper containers and packaging materials must be waterproof.
- Patent Document 1 a mixed solution containing a wax emulsion and a water-insoluble synthetic resin emulsion and a surfactant is applied to at least one side of a paper, and then heat-treated to form a layer of the surfactant on the outermost layer.
- the formed moisture-proof paper is described.
- At least one coating layer is provided on at least one side of the base paper, and the coating layer located on the outermost surface contains microcapsules containing wax, and the coating amount is solid.
- the minute conversion is 0.5 g / m 2 or more and 2.5 g / m 2 or less, and the coating layer located between the outermost coating layer and the base paper is an acrylic copolymer and / or a styrene-based copolymer.
- Moisture-proof liners containing polymers are described.
- Paper containers that replace Styrofoam are required in the flow of deplasticization, and water-resistant and water-repellent liners are attracting attention in order to manufacture such containers.
- simple moisture-proof paper is not sufficiently waterproof, and it is difficult to use it as a container or packing material for transporting ice such as chilled products.
- a moisture-proof paper having only a surface active agent layer formed on the outermost layer and a moisture-proof liner having at least two coating layers provided have not been sufficiently waterproof.
- the present invention has been made in view of such circumstances, and an object of the present invention is to provide a waterproof paper having both moisture-proof and waterproof properties and a method for manufacturing the same.
- the present inventors have found that when a waterproofing agent such as styrene / acrylic resin is applied to a paper base material having a low Cobb water absorption, the paint does not easily become water droplets, and the paint is made into paper. We succeeded in distributing it uniformly on the substrate. According to the present invention, even in a paper substrate having water repellency because it is coated with a wax-based water repellent, by selectively using a specific waterproofing agent, the waterproofing agent can be uniformly applied on the paper substrate. Since it can be coated, it is possible to improve the waterproofness of the paper.
- a waterproofing agent such as styrene / acrylic resin
- the present invention includes, but is not limited to, the following aspects.
- 120 seconds Cobb water absorption is 5 to 25 g / m 2 , pulp and paper test method No.
- a waterproof paper obtained by applying a waterproofing agent on a paper substrate having a water repellency of R4 or higher specified in 68, wherein the waterproofing agent is at least one component of a styrene resin, an acrylic resin, a polyolefin resin, and a wax.
- the above waterproof paper containing.
- the waterproof paper according to [1], wherein the coating amount of the coating layer is 4 to 20 g / m 2.
- the moisture permeability is less than 50g / m 2 ⁇ 24h, waterproof paper according to [1] or [2].
- a method for manufacturing waterproof paper which comprises applying a waterproofing agent on a paper substrate having a water repellency of R4 or higher specified in 68, wherein the waterproofing agent is a styrene resin, an acrylic resin, or a polyolefin resin.
- the above method which comprises at least one component of the above and a wax.
- the present invention relates to waterproof paper.
- the waterproof paper refers to a paper having a function that water does not soak even when exposed to water for a long time. Further, in the preferred embodiment of the present invention, the waterproof paper according to the present invention does not cause water seepage even when water is put in a paper container and left for 3 weeks, and the shape of the container does not change or is slightly deformed. It is seen, but the shape of the container is maintained.
- the use of the waterproof paper according to the present invention is not particularly limited, and for example, a cardboard box, a packaging piece containing a food product such as fresh fish and vegetables, or a package containing a hygroscopic material such as a detergent. It can be used as a box or the like.
- the basis weight of the waterproof paper according to the present invention is not particularly limited, but can be, for example, 30 to 800 g / m 2 .
- the basis weight of the waterproof paper can be, for example, 30 to 350 g / m 2 or 50 to 300 g / m 2 .
- the basis weight of the waterproof paper is 75 to 800 g / m 2 , 100 to 700 g / m 2 , and further 200 to 600 g / m 2. Can be.
- Waterproof paper of the present invention in a preferred embodiment, 120 seconds Cobb water absorption of the surface is at 3 g / m 2 or less, more preferably 2 g / m 2 or less, may be at 1 g / m 2 or less.
- the water absorption of the Cobb for 30 minutes on the surface is 25 g / m / 2. It is m 2 or less, more preferably 20 g / m 2 or less, and may be 10 g / m 2 or less.
- the Cobb water absorption is measured by bringing 100 ml of distilled water into contact with the coating layer and measuring the weight per unit area of the absorbed water after a specified time in accordance with the Cobb method specified in JIS P8140. Even under the condition that the measurement time is extended, the lower the water absorption of the Cobb, the lower the water absorption of the coating layer.
- Waterproof paper of the present invention is excellent in moisture resistance, in a preferred embodiment, the moisture permeability is less than 100g / m 2 ⁇ 24h, more preferably 75g / m 2 ⁇ 24h or less, more preferably 50 g / m 2 -It is 24 hours or less.
- the moisture permeability of the paper can be measured from the coating layer side of the waterproof paper in accordance with JIS Z 0208, and the smaller the value, the higher the moisture resistance.
- the waterproof paper of the present invention is also excellent in oil resistance, and in a preferred embodiment, the oil repellency on the coating layer side is preferably kit number 7 or more, more preferably 8 or more, and 9 or more. Is more preferable.
- the oil repellency of the waterproof paper is determined from the coating layer side of the waterproof paper in accordance with "Paper and Paperboard-Paper Oil Degree Test Method-Kit Method" (JAPAN TAPPI Pulp and Paper Test Method No. 41). It can be measured, and the larger the value of the kit number, the higher the oil resistance.
- the drip oil absorption degree on the coating layer side is 500 seconds or more, more preferably 550 seconds or more, and further preferably 600 seconds or more.
- the oil absorption of the waterproof paper is the time until one drop of light oil No. 1 whose kinematic viscosity coefficient is adjusted to 3 cSt is dropped on the sample surface using a microsyringe equipped with an injection needle H5 until the surface becomes glossy. Can be evaluated by.
- the smoothness of the coated surface is preferably 15 seconds or longer, more preferably 20 seconds or longer, and even more preferably 25 seconds or longer.
- the smoothness of the surface of the coated layer of the waterproof paper is within the above range, high gloss can be obtained on the surface of the coated layer, and a waterproof paper having more cosmetic properties can be obtained.
- the waterproof paper according to the present invention has at least a paper substrate and a waterproof coating layer provided on at least one surface of the paper substrate.
- the basis weight of the paper substrate is not particularly limited, and can be, for example, 10 to 800 g / m 2 .
- the basis weight can be appropriately set in the range of 10 to 300 g / m 2.
- the basis weight is 30 to 250 g / m 2. It can be set in the range of.
- the basis weight thereof can be appropriately set in the range of 70 to 800 g / m 2 , for example, in the case of a corrugated cardboard liner.
- the basis weight can be set in the range of 80 to 600 g / m 2.
- the paper substrate used in the present invention has a 120-second hump water absorption of 25 g / m 2 or less, preferably 20 g / m 2 or less, and more preferably 15 g / m 2 or less on the surface on which the waterproof coating layer is provided.
- the paper substrate used in the present invention has a 120-second Cobb water absorption of 5 g / m 2 or more, preferably 7 g / m 2 or more, and more preferably 10 g / m 2 or more.
- the water absorption of the paper substrate for 120 seconds is adjusted by applying a water repellent such as wax or a coating agent (sealing agent) having no waterproof property such as varnish containing resin.
- the 120-second hump water absorption of the paper substrate is within the above range, the paper strength is prevented from being lowered due to excessive penetration of the water contained in the solvent of the waterproof paint, and the solid in the waterproof paint.
- reliable coating is performed, and both waterproofness and moisture resistance can be improved.
- the paper substrate used in the present invention is, in a preferred embodiment, the JAPAN TAPPI pulp and paper test method No.
- the water repellency measured in accordance with 68 "Paper and Paperboard-Water Repellent Test Method" is R4 or more, more preferably R6 or more, and even more preferably R8 or more.
- the water repellency of the paper base material is R4 or higher, when the waterproofing agent is applied, the water contained in the coating liquid does not excessively permeate into the paper base material, and the decrease in the strength of the paper is suppressed. Can be done.
- the paper substrate used in the present invention has a drip oil absorption degree of 5 seconds or more, more preferably 7 seconds or more, still more preferably 10 seconds or more on the surface on which the waterproof coating layer is provided.
- the upper limit is not particularly limited, but is preferably 80 seconds or less, more preferably 75 seconds or less, and further preferably 70 seconds or less.
- the oil absorption of the paper substrate is the time until one drop of light oil No. 1 whose kinematic viscosity coefficient is adjusted to 3 cSt is dropped on the sample surface using a microsyringe equipped with an injection needle H5 until the surface becomes glossy. Can be evaluated by.
- the physical characteristics of the paper base material are not particularly limited, and can be appropriately set according to the use of the waterproof paper.
- the longitudinal elongation is 1.0 to 15.0%
- the lateral elongation is 2.0 to 12.0%
- the specific compressive strength is 100 to 350 Nm 2 / g
- the specific burst strength is 2. It can be set to be 80 to 5.00 kPa ⁇ m 2 / g.
- the paper substrate used in the present invention has a Wangken-type smoothness of 13 seconds or more, more preferably 15 seconds or more, and further preferably 17 seconds or more on the surface on which the coating layer is provided.
- the upper limit is not particularly limited, but is preferably 100 seconds or less, more preferably 90 seconds or less, still more preferably 80 seconds or less, and most preferably 70 seconds or less.
- the smoothness of the surface on which the waterproof coating layer is provided is within the above range, the waterproof coating layer that uniformly covers the paper substrate can be provided, and the waterproof and moisture-proof properties are improved.
- the paper substrate used in the present invention in a preferred embodiment is a moisture permeability was measured from the side of providing a waterproof coating layer 1500g / m 2 ⁇ 24h or more, more preferably 1750g / m 2 ⁇ 24h or more, more preferably is 2000g / m 2 ⁇ 24h or more.
- the upper limit of the moisture permeability is not particularly limited, in a preferred embodiment, not more than 5000g / m 2 ⁇ 24h, more preferably 4500g / m 2 ⁇ 24h or less, more preferably not more than 4000g / m 2 ⁇ 24h.
- the moisture permeability of the surface on which the waterproof coating layer is provided is within the above range, the moisture in the coating agent is efficiently evaporated to the paper layer side in the drying process after coating, so that the waterproof coating is uniformly coated.
- a work layer can be provided, which makes it easier to improve waterproofness and moisture resistance.
- the paper substrate used in the present invention has a water contact angle of 75 degrees or more and more preferably 77 degrees or more on the surface on which the waterproof coating layer is provided.
- the water contact angle is in the above range, it is possible to prevent the water contained in the coating liquid from excessively permeating into the paper base material and prevent the strength of the paper base material from being lowered.
- raw material pulp for the paper base material known materials can be used without particular limitation.
- coniferous bleached kraft pulp (NBKP) broadleaf bleached kraft pulp (LBKP), coniferous unbleached kraft pulp (NUKP), broadleaf bleached kraft pulp (LUKP), crushed wood pulp (GP), refiner ground pulp.
- Various wood-derived pulps such as (RGP), chemical pulp (CP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), and non-wood pulp obtained from Kenaf, Bagus, bamboo, hemp, straw, etc. Can be mentioned.
- the paper base material may contain recycled paper pulp or may not contain recycled paper pulp.
- the blending ratio of the recycled paper pulp in the total pulp is preferably 10% by mass or more, more preferably 25% by mass or more, still more preferable. Can be 50% by mass or more, most preferably 70% by mass or more, and 100% by mass (consisting only of pulp derived from used paper).
- kraft pulp may be blended as pulp other than used paper pulp, or the entire amount may be kraft pulp.
- the recycled paper pulp compounding ratio per layer can be as described above, and the recycled paper pulp compounding ratio in each layer is different. There may be.
- used paper pulp used paper pulp, high-quality paper, high-quality coated paper, medium-quality paper, medium-quality coated paper, shavings, etc.
- Printed used paper written used paper, paper such as discarded confidential documents, used magazine paper, used newspaper, and deinked pulp (DIP) can be used.
- DIP deinked pulp
- a sizing agent and a water-repellent agent can be added internally or externally, and further, a paper strength enhancing agent can be internally added in order to improve the strength.
- the sizing agent include rosin-based sizing agents, rosin emulsion-based sizing agents, ⁇ -carboxymethyl saturated fatty acids, neutral rosin-based sizing agents, alkyl ketene dimer (AKD), alkenyl anhydride succinic acid (ASA), and the like.
- Examples thereof include cationic polymer-based sizing agents.
- the water repellent include a fluorine-based resin, a polyamide-based resin, and a wax.
- examples of the paper strength enhancer include conventionally used paper strength enhancers such as polyacrylamide (PAM) and modified starch.
- PAM polyacrylamide
- Coating amount in the case of externally added water-repellent agent is preferably 3 g / m 2 or less, more preferably 2 g / m 2 or less.
- a known filler can be added to the paper substrate as needed, and inorganic fillers and organic fillers can be used without limitation.
- the inorganic filler include kaolin, calcined kaolin, delaminated kaolin, clay, calcined clay, delaminated clay, illite, heavy calcium carbonate, light calcium carbonate, light calcium carbonate-silica complex, magnesium carbonate, and carbonic acid.
- examples thereof include barium, titanium dioxide, zinc oxide, silicon oxide, amorphous silica, aluminum hydroxide, calcium hydroxide, magnesium hydroxide, zinc hydroxide and the like
- the organic filler include urea-formalin resin and polystyrene resin. , Phenolic resin and the like.
- the paper substrate can be manufactured by a known papermaking method. For example, it can be performed using a long net paper machine, a gap former type paper machine, a hybrid former type paper machine, an on-top former type paper machine, a round net paper machine, and the like, but the present invention is not limited thereto.
- a smoothing treatment may be performed if necessary.
- a smoothing process device such as a normal calendar, a super calendar, a gloss calendar, a soft calendar, a thermal calendar, or a shoe calendar can be used.
- the smoothing treatment device may appropriately adjust the form of the pressurizing device, the number of pressurizing nips, heating, linear pressure, and the like.
- the waterproof paper according to the present invention has a waterproof coating layer provided on a paper base material, and in the present invention, the waterproof coating layer contains a synthetic resin and wax.
- the synthetic resin preferably contains at least one of a styrene resin, an acrylic resin, and a polyolefin resin.
- the synthetic resin is a styrene resin and / or an acrylic resin.
- the copolymerization ratio of the styrene-based monomer having a styrene-based skeleton in the structure is preferably 50% by mass or more, and the styrene-based resin is preferable. It may consist only of a monomer polymer.
- styrene-based monomer examples include styrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, 2,4-dimethylstyrene, ethylstyrene, p-tert-butylstyrene, ⁇ -methylstyrene, and ⁇ .
- -Methyl-p-methylstyrene and the like can be mentioned.
- Examples of the monomer copolymerizable with the styrene monomer include alkyl methacrylate such as methyl methacrylate, cyclohexyl methacrylate and methyl phenyl methacrylate, alkyl acrylate such as methyl acrylate, ethyl acrylate, butyl acrylate and cyclohexyl acrylate, and methacrylic acid.
- Unsaturated carboxylic acids such as acrylic acid, unsaturated dicarboxylic acid anhydrides such as maleic acid and itaconic acid, unsaturated nitriles such as acrylonitrile and methacrylonitrile, 1,3-butadiene, 2-methyl-1 , Conjugate diene such as 3-butadiene and the like. These can be used alone or in combination of two or more.
- the acrylic resin that can be contained in the waterproof coating layer constituting the present invention is a resin having a copolymerization ratio of acrylic acid, methacrylic acid, and an acrylic monomer that is a derivative thereof of 50% by mass or more. Yes, it may consist only of a polymer of an acrylic monomer.
- acrylic monomer examples include methacrylic acid esters such as cyclohexyl methacrylate, t-butylcyclohexyl methacrylate and methyl methacrylate, and acrylic acid esters such as methyl acrylate, ethyl acrylate, butyl acrylate and isopropyl acrylate.
- the acrylic resin may be obtained by polymerizing one or more kinds of monomers selected from these acrylic monomers.
- Examples of the monomer copolymerizable with the acrylic monomer include styrene, o-methylstyrene, p-methylstyrene, 2,4-dimethylstyrene, ethylstyrene, p-tert-butylstyrene, and ⁇ -methyl.
- Aromatic vinyl compounds such as styrene and ⁇ -methyl-p-methylstyrene, unsaturated nitriles such as acryliconitrile and methacrylonitrile, maleimides such as N-phenylmaleimide and N-cyclohexylmaleimide, and unsaturated dicarboxylic acids such as maleic anhydride.
- Examples thereof include unsaturated carboxylic acids such as anhydrides, methacrylic acid and acrylic acid. These can be used alone or in combination of two or more.
- the waterproof coating layer contains wax.
- the wax contained in the waterproof coating layer include polyethylene wax, Fishertroph wax, oil-based synthetic wax (fatty acid ester-based, fatty acid amide, ketone / amines), synthetic wax such as hydrogen hardening oil, beeswax, and wood wax.
- Paraffin wax natural wax such as microcrystallin wax and the like. These waxes can be used alone or in combination of two or more, and a hydrocarbon wax containing paraffin is particularly suitable.
- the pigment may be contained in the waterproof coating layer as long as the waterproof property is not impaired for the purpose of improving the whiteness.
- the whiteness of the surface of the waterproof coating layer is increased by 1% or more as compared with the whiteness of the paper substrate by containing the pigment.
- Such pigments include calcium carbonate, titanium oxide, kaolin, clay, engineered kaolin, delaminated clay, talc, barium sulphate, calcium sulphate, zinc oxide, silicic acid, silicate, colloidal silica, satin white, mica, etc.
- Inorganic pigments such as montmorillonite can be mentioned, and these pigments can be used alone or in combination of two or more.
- kaolin, calcium carbonate or mica which have flat particles, is particularly suitable because it does not easily impair waterproofness.
- a flat-shaped inorganic pigment preferably has an aspect ratio of 10 or more.
- the content of the pigment in the waterproof coating layer is preferably 5 to 40% by mass or less, more preferably 10% by mass to 35% by mass or less. If the content of the pigment is less than 5% by mass, the effect of improving the whiteness cannot be sufficiently obtained, and if it exceeds 40% by mass, the moisture-proof property of the waterproof coating layer of the synthetic resin component, It is not preferable because the waterproof function may not be fully exhibited.
- other coating agents for example, a binder, a stabilizer, a defoaming agent, a viscosity improving agent, a water retaining agent, a preservative, a coloring agent and the like may be contained.
- the waterproof coating layer can be formed by applying a coating agent containing the above components on a paper substrate and drying it.
- the coating amount of the waterproof coating layer is preferably 4 to 20 g / m 2, and more preferably 5 to 15 g / m 2 . If it exceeds 20 g / m 2 , further improvement in waterproofness cannot be expected, but the manufacturing cost may increase.
- the waterproof coating layer provided on the waterproof paper of the present invention has an average thickness of 5.5 to 20 ⁇ m, more preferably 5.6 to 15 ⁇ m, still more preferably 5.7 to 12.5 ⁇ m. ..
- the average thickness of the coating layer is an average value of the thickness of the waterproof coating layer measured by cutting a sample into strips and observing the cross section at arbitrary 10 points using an electron microscope.
- moisture permeability 15 (g / m 2 ⁇ 24h ) per unit thickness of the waterproof coating layer / [mu] m or less are preferred, 10 (g / m 2 ⁇ 24h) / ⁇ m or less still more preferably, 7 (g / m 2 ⁇ 24h) / ⁇ m or less is more desirable.
- the moisture permeability per unit thickness of the waterproof coated layer is calculated by dividing the moisture permeability measured from the coating layer side of the waterproof paper in accordance with JIS Z 0208 by the average coating layer thickness.
- the waterproof paper of the present invention can be produced by applying a waterproofing agent to at least one surface of a paper base material and drying the coated waterproofing agent.
- the formation of the waterproof coating layer can be performed by applying a coating agent using a known coating method, for example, air knife coating, curtain coating, blade coating, gate roll coating, die.
- a coating method such as coating can be used.
- the coating layer may be a single layer or a plurality of layers, a plurality of coating layers may be sequentially coated, or two or more layers may be simultaneously coated by curtain coating or the like. good.
- at least one coating layer may be a waterproof coating layer, and it is preferable to apply a waterproofing agent as the outermost coating layer.
- the temperature of the coating layer at the outlet of the drying step is preferably adjusted to be less than 120 ° C.
- the coating speed at the time of coating the coating agent can be appropriately set in consideration of the viscosity of the coating agent and the target coating amount.
- the amount of the coating agent applied to the surface of the paper substrate becomes uniform. Therefore, the thickness of the coating film becomes uniform, and the generation of blister in the coating layer can be suppressed in the drying step which is a subsequent step.
- the amount of the coating agent used can be reduced as compared with the contact coating method, and the manufacturing cost can be suppressed.
- the coating agent applied to the paper substrate is dried to form a coating layer.
- the temperature of the coating layer at the outlet is preferably less than 120 ° C, preferably 100 ° C or less. May be adjusted to. If the temperature of the coating layer at the outlet is 120 ° C or higher, the incidence of blisters in the coating layer may increase, and blocking occurs in the waterproof paper wound after the coating layer is formed. I have something to do.
- the temperature of the coating layer at the outlet is preferably 60 ° C. or higher, more preferably 70 ° C. or higher, and may be 80 ° C. or higher.
- the coating layer temperature at the outlet is less than 60 ° C., in some cases, not only blocking may occur in the waterproof paper wound after the coating layer is formed, but also the coating layer dries. Due to insufficient performance, waterproof and moisture proof performance may not be fully exhibited.
- the coating layer temperature at the exit of the drying process can be set in consideration of the basis weight and paper thickness of the paper base material.
- the coating layer is compared with the kraft paper which is a single layer paper and has a relatively small basis weight and paper thickness. Blister tends to occur on the surface of the corrugated cardboard. The reason is not limited, but in the case of corrugated cardboard liners, the basis weight and paper thickness are often larger and the air permeability is lower than that of kraft paper, and even if the moisture content in the paper is the same as that of kraft paper, in the drying process.
- the coating layer temperature at the outlet of the drying step it is preferable to adjust the coating layer temperature at the outlet of the drying step to a lower value within the above range as the basis weight and the thickness of the paper base material become larger.
- the outlet of the drying step is the outlet of the drying zone when there is one drying zone in the drying step, and the outlet of the most downstream drying zone when there are a plurality of drying zones in the drying step. ..
- the temperature of the coating layer at the exit of the drying process can be adjusted by adjusting the drying time and the temperature of the drying zone.
- the drying time is determined by the feeding speed of the paper substrate, the number of drying zones, the length, the equipment capacity of the drying zones (air volume, infrared output), and the like.
- a known drying method can be used, and examples thereof include a steam cylinder heating drying method, a hot air drying method, a gas type infrared drying method, an electric infrared drying method, and any of these. It can be used alone or in combination of two or more.
- Example 2 A liner sample was obtained in the same manner as in Sample 1 except that the amount of the waterproofing agent applied was 7.8 g / m 2.
- Example 3 A liner sample was obtained in the same manner as in Sample 1 except that the amount of the waterproofing agent applied was 11.3 g / m 2.
- Back layer made of 100% recycled paper pulp
- middle layer made of 100% recycled paper pulp
- surface layer made of 35% unbleached kraft pulp and 65% recycled paper pulp
- a weight ratio of back layer: middle layer: surface layer 25:60:15.
- a water repellent containing paraffin wax and rosin is applied to the surface layer on one side, dried again with a dryer, and then smoothed using a calender to obtain the paper substrate B.
- Manufactured (basis weight: about 280 g / m 2 , surface 120 seconds Cobb water absorption: 16 g / m 2 ).
- Example 5 A liner sample was obtained in the same manner as in Sample 4 except that the amount of the waterproofing agent applied was 7.9 g / m 2.
- Example 6 (comparative example)>
- smoothing treatment was performed using a calender to produce a paper substrate C (basis weight: about 260 g / m 2 , surface 120 seconds Cobb water absorption: 28 g / m 2 ). ..
- Example 7 (comparative example)> A liner sample was produced in the same manner as in Sample 1 except that the waterproofing agent was not applied (basis weight: about 280 g / m 2 ).
- Example 8 (comparative example)> A liner sample was produced in the same manner as in Sample 4 except that the waterproofing agent was not applied (basis weight: about 280 g / m 2 ).
- Example 9 (comparative example)> A liner sample was produced in the same manner as in Sample 6 except that the waterproofing agent was not applied (basis weight: about 260 g / m 2 ).
- the measurement time was not only 120 seconds (2 minutes), which is a normal specified time, but also 30 minutes.
- a paper container (length 28 cm x width 22 cm x depth 13 cm, the coating layer is located on the inner surface side) as shown in FIG. 1 is prepared, and 1.0 L of water is poured into this paper container. It was put in and left in an environment with a temperature of 40 ° C. and a humidity of 80%. The state of water seepage and the shape of the box after being left for 1 week, 2 weeks, and 3 weeks were visually observed, and the waterproofness was judged based on the following criteria. ⁇ : Water does not seep into the outer surface of the container or the inner surface of the container above the water surface, and the shape of the box can be maintained.
- ⁇ Water does not seep into the outer surface of the container, and the shape of the box can be maintained. (However, water has penetrated into the inner surface of the container) ⁇ : Water seeps out to the outer surface of the container and the shape of the box cannot be maintained.
- Samples 1 to 4 provided with a waterproof coating layer of styrene / acrylic resin on a paper substrate with low water absorption and high water repellency have moisture resistance and waterproofness. Even if it was held together and left in a state of water for a long period of 3 weeks, no leakage occurred. On the other hand, in the samples 7 to 9, water had exuded to the extent that the shape of the box could not be maintained after 1 day or 6 hours.
- the waterproof paper of the present invention can be suitably used as a packaging material especially for liquids.
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Abstract
Description
[1] 120秒コッブ吸水度が5~25g/m2、紙パルプ試験方法No.68に規定する撥水度がR4以上である紙基材上に防水剤を塗工した防水紙であって、防水剤が、スチレン系樹脂、アクリル系樹脂、ポリオレフィン樹脂の少なくとも1つの成分およびワックスを含有する、上記防水紙。
[2] 前記塗工層の塗工量が4~20g/m2である、[1]に記載の防水紙。
[3] 透湿度が50g/m2・24h以下である、[1]または[2]に記載の防水紙。
[4] 前記紙基材のコッブ吸水度が、120秒で3g/m2以下であるか、30分で25g/m2以下である、[1]~[3]のいずれかに記載の防水紙。
[5] 前記紙基材の透湿度が1500g/m2・24h以上である、[1]~[4]のいずれかに記載の防水紙。
[6] 前記紙基材の王研式平滑度が13秒以上である、[1]~[5]のいずれかに記載の防水紙。
[7] 前記紙基材の少なくとも片面に撥水剤が塗布されている、[1]~[6]のいずれかに記載の防水紙。
[8] 紙基材が、多層抄きの板紙である、[1]~[7]のいずれかに記載の防水紙。
[9] 防水紙のコッブ吸水度が、120秒で3g/m2以下であるか、30分で25g/m2以下である、[1]~[8]のいずれかに記載の防水紙。
[10] 120秒コッブ吸水度が5~25g/m2、紙パルプ試験方法No.68に規定する撥水度がR4以上である紙基材上に防水剤を塗工することを含む、防水紙の製造方法であって、防水剤が、スチレン系樹脂、アクリル系樹脂、ポリオレフィン樹脂の少なくとも1つの成分およびワックスを含有する、上記方法。
本発明に係る防水紙は、紙基材と、紙基材の少なくとも一方の面に設けられた防水塗工層と、を少なくとも有している。本発明において紙基材の坪量は特に制限されず、例えば、10~800g/m2とすることができる。紙基材が単層紙である場合、坪量は10~300g/m2の範囲で適宜設定することができ、例えば、紙基材がクラフト紙の場合、坪量を30~250g/m2の範囲で設定することができる。また、紙基材が2層以上の紙層を有する多層抄き板紙である場合、その坪量は70~800g/m2の範囲で適宜設定することができ、例えば、段ボールのライナの場合、坪量を80~600g/m2の範囲で設定することができる。
本発明に係る防水紙は、紙基材上に設けられた防水塗工層を有しており、本発明において防水塗工層は、合成樹脂およびワックスを含有する。合成樹脂は、スチレン系樹脂、アクリル系樹脂、ポリオレフィン系樹脂の少なくとも1種類を含有することが好適である。特に、合成樹脂がスチレン系樹脂および/またはアクリル系樹脂であることが好適である。
<サンプル1>
段古紙パルプ100%からなる裏層、古紙パルプ100%からなる中層、未晒クラフトパルプ70%および段古紙パルプ30%からなる表層を裏層:中層:表層=25:60:15の重量比で抄き合わせ、ドライヤにて乾燥後、パラフィン系ワックスおよびロジンを含む撥水剤を表層側に片面塗工し、再度ドライヤにて乾燥後、カレンダを用いて平滑化処理を行い、紙基材Aを製造した(坪量:約280g/m2、表面の120秒コッブ吸水度:13g/m2)。次いで、紙基材の表層側にエアナイフを用いてスチレン・アクリル系樹脂とワックスを含有する防水剤(マイケルマン VaporCoat2200)を10.0g/m2塗布し、乾燥工程出口における塗工層の温度が80℃となるよう熱風乾燥してライナサンプルを得た。
防水剤の塗工量を7.8g/m2とした以外は、サンプル1と同様にしてライナサンプルを得た。
防水剤の塗工量を11.3g/m2とした以外は、サンプル1と同様にしてライナサンプルを得た。
段古紙パルプ100%からなる裏層、古紙パルプ100%からなる中層、未晒クラフトパルプ35%および段古紙パルプ65%からなる表層を裏層:中層:表層=25:60:15の重量比で抄き合わせ、ドライヤにて乾燥後、パラフィン系ワックスおよびロジンを含む撥水剤を表層側に片面塗工、再度ドライヤにて乾燥後、カレンダを用いて平滑化処理を行い、紙基材Bを製造した(坪量:約280g/m2、表面の120秒コッブ吸水度:16g/m2)。次いで、紙基材の表層側にエアナイフを用いてスチレン・アクリル系樹脂とワックスを含有する防水剤(マイケルマン VaporCoat2200)を10.5g/m2塗布し、乾燥工程出口における塗工層の温度が80℃となるよう熱風乾燥してライナサンプルを得た。
防水剤の塗工量を7.9g/m2とした以外はサンプル4と同様にしてライナサンプルを得た。
段古紙パルプ100%からなる裏層、古紙パルプ100%からなる中層、未晒クラフトパルプ25%および段古紙パルプ75%からなる表層を裏層:中層:表層=25:65:10の重量比で抄き合わせ、ドライヤにて乾燥後、カレンダを用いて平滑化処理を行い、紙基材Cを製造した(坪量:約260g/m2、表面の120秒コッブ吸水度:28g/m2)。次いで、紙基材の表層側にエアナイフを用いてスチレン・アクリル系樹脂とワックスを含有する防水剤(マイケルマン VaporCoat2200)を8.9g/m2塗布し、乾燥工程出口における塗工層の温度が80℃となるよう熱風乾燥してライナサンプルを得た。
防水剤の塗工を行わなかった以外は、サンプル1と同様にしてライナサンプルを製造した(坪量:約280g/m2)。
防水剤の塗工を行わなかった以外は、サンプル4と同様にしてライナサンプルを製造した(坪量:約280g/m2)。
防水剤の塗工を行わなかった以外は、サンプル6と同様にしてライナサンプルを製造した(坪量:約260g/m2)。
それぞれのサンプルについて、下記の手順により、紙質および防水性を評価した。
(坪量) JIS P 8124に準拠して測定した。
(紙厚) JIS P 8118及びJIS P 8124に準拠して測定した。
(防水層の平均塗工層厚み) サンプルを短冊状に切断し、その断面を任意の10箇所において電子顕微鏡を用いた観察により塗工層の厚みを測定し、平均値を算出して平均塗工層厚みとした。
(撥水度) JAPAN TAPPI 紙パルプ試験方法 No.68「紙及び板紙-はっ水性試験方法」に準拠し、塗工層側(表層側)を測定した。
(透湿度) JIS Z 0208に準拠し、塗工層側(表層側)から測定した。
(コッブ吸水度) JIS P 8140に準拠し、塗工層側(表層側)からコッブ法により測定を行った。すなわち、100mlの蒸留水を塗工層(表層)に接触させ、規定時間後に吸収された水の単位面積あたりの重量を測定した。なお、測定時間は、通常の規定時間である120秒(2分間)に加え、30分でも測定を行った。
(点滴吸油度) 注射針H5号を備えたマイクロシリンジを用いて、動粘性係数が3cStに調整した軽油1号をサンプル表面に1滴滴下し、表面の光沢がみえなくなるまでの時間を測定した。ただし、測定時間は600秒(10分)で打ち切り、600秒経過しても表面に光沢が見えた場合は「600秒以上」と評価した。
(はつ油度) JAPAN TAPPI 紙パルプ試験方法 No.41「紙及び板紙-はつ油度試験方法-キット法」に準拠し、塗工層側(表層側)を測定した。
○:水が容器外面や水面より上の容器内面に浸み出しておらず、箱の形状を維持できている
△:水が容器外面には浸み出してなく、箱の形状は維持できている(ただし、容器内面に水が浸み込んでいる)
×:水が容器外面に浸み出していて、箱の形状を維持できていない
Claims (10)
- 120秒コッブ吸水度が5~25g/m2、紙パルプ試験方法No.68に規定する撥水度がR4以上である紙基材上に防水剤を塗工した防水紙であって、
防水剤が、スチレン系樹脂、アクリル系樹脂、ポリオレフィン樹脂の少なくとも1つおよびワックスを含有する、防水紙。 - 前記塗工層の塗工量が4~20g/m2である、請求項1に記載の防水紙。
- 透湿度が50g/m2・24h以下である、請求項1または2に記載の防水紙。
- 前記紙基材のコッブ吸水度が、120秒で3g/m2以下であるか、30分で25g/m2以下である、請求項1~3のいずれかに記載の防水紙。
- 前記紙基材の透湿度が1500g/m2・24h以上である、請求項1~4のいずれかに記載の防水紙。
- 前記紙基材の王研式平滑度が13秒以上である、請求項1~5のいずれかに記載の防水紙。
- 前記紙基材の少なくとも片面に撥水剤が塗布されている、請求項1~6のいずれかに記載の防水紙。
- 紙基材が、多層抄きの板紙である、請求項1~7のいずれかに記載の防水紙。
- 防水紙のコッブ吸水度が、120秒で3g/m2以下であるか、30分で25g/m2以下である、請求項1~8のいずれかに記載の防水紙。
- 120秒コッブ吸水度が5~25g/m2、紙パルプ試験方法No.68に規定する撥水度がR4以上である紙基材上に防水剤を塗工することを含む、防水紙の製造方法であって、
防水剤が、スチレン系樹脂、アクリル系樹脂、ポリオレフィン樹脂の少なくとも1つおよびワックスを含有する、上記方法。
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Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000037839A (ja) * | 1998-07-23 | 2000-02-08 | Rengo Co Ltd | 防湿耐水合紙 |
JP2002294597A (ja) * | 2001-03-30 | 2002-10-09 | Nippon Paper Industries Co Ltd | 紙器原紙及びそれを用いた紙コップ |
JP2004238750A (ja) * | 2003-02-05 | 2004-08-26 | Lintec Corp | 水離解性撥水・耐水紙 |
JP2005009016A (ja) * | 2003-06-18 | 2005-01-13 | Toppan Printing Co Ltd | 耐水紙 |
JP2006118108A (ja) * | 2004-09-27 | 2006-05-11 | Nippon Paper Industries Co Ltd | 防湿紙 |
JP2012528956A (ja) * | 2009-06-03 | 2012-11-15 | ハーキュリーズ・インコーポレーテッド | 水系ラテックスコーティング用途におけるカチオン性湿潤強度樹脂改質顔料 |
CN108691248A (zh) * | 2018-05-18 | 2018-10-23 | 汕头方大印刷包装科技有限公司 | 一种耐冰冻扭结纸及其生产工艺 |
JP2020165040A (ja) * | 2019-03-29 | 2020-10-08 | 日本製紙株式会社 | 防湿性紙およびその製造方法 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3279961B2 (ja) * | 1997-07-04 | 2002-04-30 | 紀州製紙株式会社 | 回収再生が可能な印刷用耐水紙 |
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Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000037839A (ja) * | 1998-07-23 | 2000-02-08 | Rengo Co Ltd | 防湿耐水合紙 |
JP2002294597A (ja) * | 2001-03-30 | 2002-10-09 | Nippon Paper Industries Co Ltd | 紙器原紙及びそれを用いた紙コップ |
JP2004238750A (ja) * | 2003-02-05 | 2004-08-26 | Lintec Corp | 水離解性撥水・耐水紙 |
JP2005009016A (ja) * | 2003-06-18 | 2005-01-13 | Toppan Printing Co Ltd | 耐水紙 |
JP2006118108A (ja) * | 2004-09-27 | 2006-05-11 | Nippon Paper Industries Co Ltd | 防湿紙 |
JP2012528956A (ja) * | 2009-06-03 | 2012-11-15 | ハーキュリーズ・インコーポレーテッド | 水系ラテックスコーティング用途におけるカチオン性湿潤強度樹脂改質顔料 |
CN108691248A (zh) * | 2018-05-18 | 2018-10-23 | 汕头方大印刷包装科技有限公司 | 一种耐冰冻扭结纸及其生产工艺 |
JP2020165040A (ja) * | 2019-03-29 | 2020-10-08 | 日本製紙株式会社 | 防湿性紙およびその製造方法 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023112950A1 (ja) * | 2021-12-15 | 2023-06-22 | 日本製紙株式会社 | 防水紙およびその製造方法 |
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