WO2022225042A1 - ヒートシール紙および包装袋 - Google Patents
ヒートシール紙および包装袋 Download PDFInfo
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- WO2022225042A1 WO2022225042A1 PCT/JP2022/018533 JP2022018533W WO2022225042A1 WO 2022225042 A1 WO2022225042 A1 WO 2022225042A1 JP 2022018533 W JP2022018533 W JP 2022018533W WO 2022225042 A1 WO2022225042 A1 WO 2022225042A1
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- 229920001721 polyimide Polymers 0.000 description 1
- 239000009719 polyimide resin Substances 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 229920005672 polyolefin resin Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
- 229920006380 polyphenylene oxide Polymers 0.000 description 1
- 229920000069 polyphenylene sulfide Polymers 0.000 description 1
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- 229920005749 polyurethane resin Polymers 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 229940096992 potassium oleate Drugs 0.000 description 1
- MLICVSDCCDDWMD-KVVVOXFISA-M potassium;(z)-octadec-9-enoate Chemical compound [K+].CCCCCCCC\C=C/CCCCCCCC([O-])=O MLICVSDCCDDWMD-KVVVOXFISA-M 0.000 description 1
- 239000013055 pulp slurry Substances 0.000 description 1
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- 150000004760 silicates Chemical class 0.000 description 1
- RYYKJJJTJZKILX-UHFFFAOYSA-M sodium octadecanoate Chemical compound [Na+].CCCCCCCCCCCCCCCCCC([O-])=O RYYKJJJTJZKILX-UHFFFAOYSA-M 0.000 description 1
- UIIMBOGNXHQVGW-UHFFFAOYSA-N sodium;hydron;carbonate Chemical compound [Na+].OC(O)=O UIIMBOGNXHQVGW-UHFFFAOYSA-N 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000011115 styrene butadiene Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 239000001040 synthetic pigment Substances 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/10—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of paper or cardboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B29/00—Layered products comprising a layer of paper or cardboard
- B32B29/04—Layered products comprising a layer of paper or cardboard next to a particulate layer
-
- 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
-
- 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
- D21H19/22—Polyalkenes, e.g. polystyrene
-
- 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
- D21H27/10—Packing paper
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/80—Packaging reuse or recycling, e.g. of multilayer packaging
Definitions
- the present invention relates to heat-sealable paper and packaging bags using the same.
- Packages that use the heat seal method are widely used for packaging general industrial products, as well as food, medicine, and medical equipment.
- Patent Document 1 discloses a heat-sealable paper obtained by wet-making a fiber mixture containing a mixture of kraft pulp fibers and synthetic fibers.
- the heat-sealed paper described in Patent Document 1 contains a large amount of plastic components, so it is difficult to recover the pulp and has poor recyclability. Moreover, in recent years, there has been a demand for shortening of the packaging work, and in response to this demand, there is a demand for heat-sealable paper capable of enclosing the object to be packaged immediately after the bag making process.
- An object of the present invention is to provide heat-sealable paper that is excellent in heat-sealability and recyclability, and that can enclose objects to be packaged even immediately after the bag-making process, and a packaging bag using the heat-sealable paper.
- a heat-sealable paper having at least one heat-sealable layer on at least one surface of a paper substrate, wherein the heat-sealable layer contains a water-dispersible resin binder, and the heat-sealable layers are separated from each other by 150
- the hot tack peel distance is 150 mm or less
- the heat seal peel strength is 2 N/15 mm or more
- the pulp recovery rate after re-maceration is 85. % or more, heat seal paper.
- ⁇ 2> The heat-sealable paper according to ⁇ 1>, wherein the water-dispersible resin binder has a glass transition temperature of 5°C or higher and 100°C or lower.
- ⁇ 4> The heat seal paper according to any one of ⁇ 1> to ⁇ 3>, wherein the coating amount of the heat seal layer is 2 g/m 2 or more and 20 g/m 2 or less.
- ⁇ 5> The heat-sealable paper according to any one of ⁇ 1> to ⁇ 4>, wherein the heat-sealable layer further contains a lubricant.
- ⁇ 6> The heat-sealable paper according to ⁇ 5>, wherein the lubricant is at least one selected from the group consisting of paraffin wax and carnauba wax.
- ⁇ 7> The heat seal paper according to ⁇ 5> or ⁇ 6>, wherein the content of the lubricant in the heat seal layer is 0.5% by mass or more and 30% by mass or less.
- ⁇ 8> The heat seal paper according to any one of ⁇ 1> to ⁇ 7>, wherein the surface of the heat seal layer has an Oken smoothness of 10 seconds or more.
- ⁇ 9> A packaging bag using the heat seal paper according to any one of ⁇ 1> to ⁇ 8>.
- heat-sealable paper that is excellent in heat-sealability and recyclability, and that can enclose the object to be packaged even immediately after the bag-making process, and a packaging bag using the heat-sealable paper.
- the schematic diagram of the measuring apparatus of a hot tack peeling distance is represented.
- X to Y indicating a range means “X or more and Y or less”.
- the upper and lower limits of each numerical range can be combined arbitrarily.
- operations and measurements of physical properties are performed under the conditions of room temperature (20 to 25° C.)/relative humidity of 40 to 50% RH.
- (meth)acryl is a generic term including both acryl and methacryl.
- the heat-sealable paper of the present embodiment (hereinafter also simply referred to as "heat-sealable paper”) is a heat-sealable paper having at least one heat-seal layer on at least one surface of a paper substrate, wherein the heat-seal layer contains a water-dispersible resin binder, and when the heat seal layers are heat sealed under the conditions of 150 ° C., 0.2 MPa, 1 second, the hot tack peel distance is 150 mm or less, and the heat seal peel The strength is 2 N/15 mm or more, and the pulp recovery rate after re-maceration is 85% or more.
- the heat-sealable paper of the present embodiment is excellent in heat-sealability and recyclability, and can enclose objects to be packaged even immediately after the bag making process.
- the heat-sealing layer By forming the heat-sealing layer using a water-dispersible resin binder, it is possible to recover the pulp at a high recovery rate through re-maceration while exhibiting heat-sealing properties, making it possible to reuse the pulp. Further, when the hot tack peeling distance is 150 mm or less, the adhesion between the heat seal layers can be maintained even if a force for peeling the layers acts immediately after the heat seal layers are adhered to each other. Therefore, even if the object to be packaged is enclosed immediately after the bag making process, the risk of damage to the packaging bag due to separation between the heat-sealed layers due to the impact of enclosing is suppressed, and the object to be packaged can be enclosed even immediately after the bag making process. It is considered to be. Note that the effects of the present invention are not limited by the above mechanism.
- Pulp constituting the paper substrate is not particularly limited, and known pulps can be used. Specifically, unbleached pulp such as hardwood unbleached kraft pulp (LUKP) and softwood unbleached kraft pulp (NUKP); chemical pulp such as hardwood bleached kraft pulp (LBKP) and softwood bleached kraft pulp (NBKP); groundwood pulp (GP), pressurized groundwood pulp (PGW), refiner mechanical pulp (RMP), thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), chemi-mechanical pulp (CMP), chemi-grand pulp (CGP), etc.
- unbleached pulp such as hardwood unbleached kraft pulp (LUKP) and softwood unbleached kraft pulp (NUKP); chemical pulp such as hardwood bleached kraft pulp (LBKP) and softwood bleached kraft pulp (NBKP); groundwood pulp (GP), pressurized groundwood pulp (PGW), refiner mechanical pulp (RMP), thermomechanical pulp (TMP), chemitherm
- Pulp waste paper pulp; non-wood fiber pulp such as kenaf, bagasse, bamboo and cotton; synthetic pulp and the like. These pulps may be used individually by 1 type, and may be used in combination of 2 or more type. Among these, at least one selected from the group consisting of unbleached hardwood kraft pulp (LUKP), unbleached softwood kraft pulp (NUKP), bleached hardwood kraft pulp (LBKP), and bleached softwood kraft pulp (NBKP) is preferred.
- LLKP unbleached hardwood kraft pulp
- NUKP unbleached softwood kraft pulp
- LKP bleached hardwood kraft pulp
- NNKP bleached softwood kraft pulp
- the paper base material used for the heat-sealable paper of this embodiment is preferably made of raw material pulp containing softwood pulp as a main component.
- "Material pulp containing softwood pulp as a main component” refers to material pulp in which the content of softwood pulp exceeds 50% by mass, and the content of softwood pulp is preferably 80% by mass or more, more preferably. 90% by mass or more, more preferably 100% by mass.
- Softwood pulp has a long average fiber length, and paper substrates using softwood pulp as raw material tend to have excellent impact resistance and processability (hereinafter also referred to as processability).
- the softwood pulp is preferably pulp obtained from one or more selected from the group consisting of Douglas fir and pine, more preferably Douglas fir, from the viewpoint of obtaining heat-sealable paper having excellent impact resistance and workability. It is a pulp obtained from fur.
- the raw material pulp constituting the paper substrate is preferably one or more selected from the group consisting of bleached kraft pulp and unbleached kraft pulp, more preferably unbleached kraft pulp.
- the paper substrate used for the heat-sealable paper of the present embodiment has a longitudinal tensile energy absorption X 1 measured in accordance with JIS P 8113:2006, which is measured in accordance with JIS P 8113:2006. It is preferable to satisfy the following range, where Y1 is the lateral tensile energy absorption amount.
- the beating degree of the pulp is not particularly limited, but is preferably 200 mL or more, more preferably 450 mL or more, and preferably 800 mL or less, more preferably 700 mL or less, as Canadian Standard Freeness (CSF).
- CSF is measured according to JIS P 8121-2:2012 "Pulp - Freeness Test Method - Part 2: Canadian Standard Freeness Method”.
- the geometric mean of X 1 and Y 1 of the paper substrate can be controlled by the difference in papermaking speed before and after Clupak processing and the pressure of the nip rolls.
- the papermaking speed is not particularly limited, but is preferably 200 m/min or more, more preferably 300 m/min or more, still more preferably 400 m/min or more, and preferably 1000 m/min or less, more preferably 800 m/min. Hereafter, it is more preferable to control at 700 m/min or less.
- the nip pressure between the nip roll and the blanket during Clupak processing is also not particularly limited. For example, it is preferably 5 kN/m or more, more preferably 10 kN/m or more, and preferably 50 kN/m or less, more preferably 25 kN/m or less.
- the speed difference before and after Clupak treatment is not particularly limited, and may be controlled so as to obtain the desired geometric mean of X 1 and Y 1 of the paper base material according to the basis weight and pulp material.
- the higher the speed difference the higher the geometric mean of X 1 and Y 1 of the paper base material. More preferably -40.0% or more, preferably -10.0% or less, more preferably -15.0% or less.
- a minus "-" here indicates that the speed after Clupak processing is slow.
- the nip pressure in calendering is not particularly limited, either, and depending on basis weight, pulp material, speed difference before and after Clupak treatment, etc., the desired geometric mean of X 1 and Y 1 of the paper substrate can be obtained. You can control it. It is preferably 100 kN/m or more, more preferably 130 kN/m or more, and preferably 200 kN/m or less, more preferably 170 kN/m or less.
- the ratio of X 1 to Y 1 of the paper substrate is preferably 0.5 or more, more preferably 1.0 or more, from the viewpoint of impact resistance and processability. is 2.0 or less, more preferably 1.7 or less.
- X 1 /Y 1 of the paper substrate can be adjusted by adjusting the jet wire ratio (jetting speed of pulp suspension/speed of wire). In general, as the jet wire ratio approaches 1, X 1 /Y 1 of the paper substrate tends to decrease.
- the paper substrate used for the heat seal paper of the present embodiment has a longitudinal specific tensile energy absorption X 2 measured in accordance with JIS P 8113:2006, which is measured in accordance with JIS P 8113:2006.
- Y2 is the specific tensile energy absorption amount in the transverse direction
- the geometric mean of X2 and Y2 is preferably 0.8 J/g or more , more preferably 1.0 J/g or more, from the viewpoint of impact resistance and workability. It is 5 J/g or more, more preferably 2.5 J/g or more.
- the upper limit of the geometric mean of X 2 and Y 2 is not particularly limited, it is preferably 5.0 J/g or less, more preferably 4.0 J/g or less.
- the geometric mean of X2 and Y2 of the paper substrate can be adjusted by adjusting the beating conditions and Clupak treatment conditions.
- the beating conditions generally, the geometric mean of X 2 and Y 2 of the paper substrate tends to increase as the beating of pulp proceeds.
- the beating degree of the pulp is not particularly limited, but is preferably 200 mL or more, more preferably 450 mL or more, and preferably 800 mL or less, more preferably 700 mL or less, as Canadian Standard Freeness (CSF). be.
- the geometric mean of X 2 and Y 2 of the paper substrate can be controlled by the difference in papermaking speed before and after Clupak processing and the pressure of the nip rolls.
- the papermaking speed is not particularly limited, but is preferably 200 m/min or more, more preferably 300 m/min or more, still more preferably 400 m/min or more, and preferably 1000 m/min or less, more preferably 800 m/min. 700 m/min or less, more preferably 700 m/min or less.
- the nip pressure between the nip roll and the blanket during Clupak processing is also not particularly limited. For example, it is preferably 5 kN/m or more, more preferably 10 kN/m or more, and preferably 50 kN/m or less, more preferably 25 kN/m or less.
- the speed difference before and after Clupak treatment is not particularly limited, and may be controlled so as to obtain the desired geometric mean of X 2 and Y 2 of the paper base material according to the basis weight and pulp material. The larger the speed difference, the higher the geometric mean of X 2 and Y 2 of the paper base material. More preferably -40.0% or more, preferably -10.0% or less, more preferably -15.0% or less.
- a minus "-" here indicates that the speed after Clupak processing is slow.
- the nip pressure in calendering is not particularly limited, either, and depending on basis weight, pulp material, speed difference before and after Clupak treatment, etc., the desired geometric mean of X 2 and Y 2 of the paper substrate can be obtained. You can control it. It is preferably 100 kN/m or more, more preferably 130 kN/m or more, and preferably 200 kN/m or less, more preferably 170 kN/m or less.
- the basis weight of the paper substrate is not particularly limited, but is preferably 50 g/m 2 or more, more preferably 60 g/m 2 or more, and still more preferably 70 g from the viewpoint of obtaining heat-sealable paper having impact resistance and workability. /m 2 or more, and preferably 150 g/m 2 or less, more preferably 140 g/m 2 or less, and even more preferably 120 g/m 2 or less.
- the basis weight of the paper substrate is measured according to JIS P 8124:2011.
- the density of the paper substrate is preferably 0.3 g/cm 3 or more, more preferably 0.5 g/cm 3 or more, and preferably 1.2 g/cm 3 or less. It is preferably 1.0 g/cm 3 or less.
- the density of the paper base is calculated from the basis weight and thickness of the paper base obtained by the above-described measuring method.
- dry paper strength enhancers examples include cationized starch, polyacrylamide, and carboxymethyl cellulose.
- the content of the dry paper strength agent is not particularly limited, but is preferably 3.0% by mass or less based on the raw material pulp (absolute dry mass).
- Wet paper strength agents include polyamide polyamine epichlorohydrin, urea formaldehyde resin, melamine formaldehyde resin, and the like.
- Sizing agents include rosin sizing agents, synthetic sizing agents, internal sizing agents such as petroleum resin-based sizing agents, and surface sizing agents such as styrene/acrylic acid copolymers and styrene/methacrylic acid copolymers.
- the content of the sizing agent is not particularly limited, but is preferably 3.0% by mass or less based on the raw material pulp (absolute dry mass).
- Fixing agents include aluminum sulfate and polyethyleneimine.
- the content of the fixing agent is not particularly limited, but is preferably 3.0% by mass or less based on the raw material pulp (absolute dry mass).
- Clupak paper sinretched paper
- the stretched paper has an elongation of 5% or more in the vertical or horizontal direction, and is exemplified by kraft paper No. 5, No. 1 and No. 2 described in JIS P 3401:2000.
- the heat-sealable paper of this embodiment has at least one heat-sealable layer on at least one surface of the paper substrate.
- the heat-seal layer is a layer that is melted by heat, ultrasonic waves, or the like and adheres.
- the heat seal layer contains a water-dispersible resin binder.
- a water-dispersible resin binder is a resin that is not water-soluble (specifically, the solubility in water at 25°C is 10 g/L or less), but is finely dispersed in water like an emulsion or suspension. Binder. By applying a water-based coating to the heat-seal layer using a water-dispersible resin binder, it is possible to obtain heat-sealable paper that is excellent in re-disaggregation and can be recycled as paper. If the water-dispersible resin binder also corresponds to the following lubricant, it shall be classified as a lubricant.
- styrene/butadiene copolymers may be used individually by 1 type, and may use 2 or more types together.
- at least one selected from the group consisting of styrene/butadiene copolymers and olefin/unsaturated carboxylic acid copolymers is preferred.
- olefin/unsaturated carboxylic acid-based copolymers are more preferable from the viewpoint of further reducing the hot tack peel distance, and styrene/butadiene-based copolymers are more preferable from the viewpoint of further improving recyclability.
- olefin/unsaturated carboxylic acid copolymers examples include ethylene-(meth)acrylic acid copolymers and ethylene-(meth)acrylic acid alkyl ester copolymers. Among them, ethylene-(meth)acrylic acid copolymers are preferred, and ethylene-acrylic acid copolymers are more preferred. Therefore, the water-dispersible resin binder contained in the heat seal layer is at least one selected from the group consisting of styrene/butadiene copolymers and ethylene-(meth)acrylic acid copolymers. Furthermore, an ethylene-(meth)acrylic acid copolymer is more preferred.
- the hot tack peel distance becomes smaller, which is more advantageous in enclosing the packaging object immediately after the bag making process.
- contamination of equipment during coating is suppressed, and operability is improved.
- the olefin/unsaturated carboxylic acid copolymer may be an ionomer.
- styrene/butadiene-based copolymer either a synthetic product or a commercial product may be used.
- Commercial products include Nipol latex LX407G51, LX407S10, LX407S12, LX410, LX415M, LX416, LX430, and LX433C manufactured by Nippon Zeon Co., Ltd. , 2507H, Nalstar SR-101, SR-102, SR-103, SR-115, SR-153 manufactured by Nippon A&L Co., Ltd., and styrene butadiene latex 0602, 0597C manufactured by JSR Corporation.
- ethylene-(meth)acrylic acid copolymer either a synthetic product or a commercial product may be used.
- the glass transition temperature of the water-dispersible resin binder is preferably 5°C or higher, more preferably 10°C or higher, still more preferably 15°C or higher, still more preferably 30°C or higher, and even more preferably 40°C or higher.
- a water-dispersible resin binder having a glass transition temperature equal to or higher than the above lower limit the hot tack peeling distance is reduced, and a heat-sealable paper capable of sealing an object to be packaged even immediately after bag making can be obtained.
- the use of a water-dispersible resin binder having a glass transition temperature equal to or higher than the above lower limit value can also suppress the occurrence of blocking.
- the glass transition temperature of the water-dispersible resin binder is preferably 100° C. or lower, more preferably 80° C. or lower, and even more preferably 55° C. or lower from the viewpoint of heat sealability.
- a value measured with a differential scanning calorimeter is adopted.
- the content of the water-dispersible resin binder in the heat seal layer is preferably 30% by mass or more, more preferably 35% by mass or more, still more preferably 40% by mass or more, still more preferably 45% by mass or more, and even more preferably is 50% by mass or more, and is 100% by mass or less, preferably 99% by mass or less, more preferably 98% by mass or less.
- heat-sealable paper having high heat-seal strength can be obtained.
- the heat-sealable layer preferably contains a lubricant in addition to the water-dispersible resin binder.
- a lubricant is a substance that can reduce the coefficient of friction on the surface of the heat seal layer by blending it in the heat seal layer.
- metal soaps include calcium stearate, sodium stearate, zinc stearate, aluminum stearate, magnesium stearate, fatty acid sodium soap, potassium oleate soap, castor oil potassium soap, and complexes thereof.
- carnauba wax and paraffin wax are preferable because they have a relatively low melting point, a wax component is easily formed on the surface of the coating layer, and they are excellent in the effect of suppressing blocking. That is, the lubricant is preferably at least one selected from the group consisting of carnauba wax and paraffin wax.
- the content of the lubricant is preferably 0.2 parts by mass or more, more preferably 0.5 parts by mass or more, and still more preferably 100 parts by mass of the water-dispersible resin binder. It is 1 part by mass or more, and preferably 50 parts by mass or less, more preferably 40 parts by mass or less, and even more preferably 35 parts by mass or less.
- the content of the lubricant in the heat seal layer is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, and still more preferably 0.5% by mass or more. Yes, and preferably 40% by mass or less, more preferably 30% by mass or less, and even more preferably 25% by mass or less.
- the heat seal layer preferably contains a water-dispersible resin binder and also contains a lubricant in addition to the water-dispersible resin binder. Moreover, in addition to the water-dispersible resin binder and the lubricant, a pigment may be contained.
- the heat seal layer may contain a pigment in addition to the water-dispersible resin binder.
- a pigment in addition to the water-dispersible resin binder.
- the pigment is not particularly limited, and various pigments used in conventional pigment coating layers are exemplified.
- a pigment may be used individually by 1 type, and may use 2 or more types together.
- a pigment having an aspect ratio of 20 or more is preferable from the viewpoint of heat seal peel strength and blocking resistance.
- the aspect ratio of the pigment is more preferably 25 or more, still more preferably 30 or more, particularly preferably 60 or more, and from the viewpoint of availability and smoothness of the heat seal layer surface, preferably 10,000 or less, It is more preferably 1,000 or less, still more preferably 300 or less.
- the aspect ratio of a pigment means major axis/minor axis, and may be measured by the following method.
- the pigment is preferably a layered inorganic compound with an aspect ratio of 20 or more.
- the form of the layered inorganic compound is tabular. When the pigment is tabular, protrusion of the pigment from the surface of the heat seal layer is suppressed, and a heat seal layer having excellent blocking resistance while maintaining the heat seal property can be obtained.
- the pigment preferably has a length (average particle diameter) of 0.1 ⁇ m or more and 100 ⁇ m or less. When the length is 0.1 ⁇ m or more, the pigment is easily aligned parallel to the paper substrate. Further, when the length is 100 ⁇ m or less, there is little concern that a part of the pigment will protrude from the heat seal layer.
- the length of the pigment is more preferably 0.3 ⁇ m or more, more preferably 0.5 ⁇ m or more, particularly preferably 1.0 ⁇ m or more, and more preferably 30 ⁇ m or less, still more preferably 20 ⁇ m or less, and particularly preferably 15 ⁇ m. It is below.
- the length of the pigment contained in the heat seal layer is obtained as follows. An enlarged photograph of the cross section of the heat seal layer is taken using an electron microscope. At this time, the magnification is such that about 20 to 30 pigments are included in the screen. Measure the individual lengths of the pigments in the screen. Then, the average value of the obtained lengths is calculated to obtain the length of the pigment. Incidentally, the length of the pigment is sometimes described in terms of particle size.
- the pigment preferably has a thickness of 200 nm or less.
- the thickness of the pigment is more preferably 100 nm or less, still more preferably 80 nm or less, even more preferably 50 nm or less, and particularly preferably 30 nm or less. Also, it is preferably 5 nm or more, more preferably 10 nm or more.
- the smaller the average thickness of the pigment the higher the heat-seal peel strength.
- the thickness of the pigment contained in the heat seal layer is determined as follows. An enlarged photograph of the cross section of the heat seal layer is taken using an electron microscope. At this time, the magnification is such that about 20 to 30 pigments are included in the screen. Measure the individual thickness of the pigment in the screen. Then, the average value of the obtained thicknesses is calculated and taken as the thickness of the pigment.
- pigments include mica, bentonite, kaolin, pyrophyllite, talc, smectite, vermiculite, chlorite, septe chlorite, serpentine, stilpnomelane, montmorillonite, ground calcium carbonate (ground calcium carbonate), Light calcium carbonate (synthetic calcium carbonate), composite synthetic pigment of calcium carbonate and other hydrophilic organic compounds, satin white, lithopone, titanium dioxide, silica, barium sulfate, calcium sulfate, alumina, aluminum hydroxide, zinc oxide, carbonate Magnesium, silicates, colloidal silica, hollow or solid organic pigment plastic pigments, binder pigments, plastic beads, microcapsules and the like.
- kaolin examples include various kaolins such as kaolin, calcined kaolin, structured kaolin, and delaminated kaolin.
- the content of the pigment in the heat seal layer is preferably 5% by mass or more, more preferably 10% by mass or more, and still more preferably 10% by mass or more, from the viewpoint of blocking resistance and recyclability. 20% by mass or more, more preferably 25% by mass or more, and from the viewpoint of heat sealability and hot tack peeling distance, preferably 70% by mass or less, more preferably 60% by mass or less, and still more preferably 50% by mass. % by mass or less.
- the heat seal layer may contain other components in addition to the water-dispersible resin binder, pigment, and lubricant.
- examples of other components include silane coupling agents; antifoaming agents; viscosity modifiers; leveling agents such as surfactants and alcohols; coloring agents such as coloring dyes.
- the heat seal paper of the present embodiment has a pulp recovery rate after re-maceration of 85% or more, more preferably 90% or more, further preferably 95% or more, and 98% or more. is even more preferred. If the pulp recovery rate after re-disintegration is within the above range, the recyclability is excellent.
- the pulp recovery rate after re-maceration of the heat-sealed paper is a value measured by the method described in Examples below.
- Peel strength can be adjusted by selecting the glass transition temperature and type of water-dispersible resin binder. For example, by setting the glass transition temperature of the water-dispersible resin binder to 100° C. or less, the resin melts under predetermined heat-sealing conditions and the heat-seal layers adhere well to each other, so that the desired peel strength can be secured. can be done.
- the hot tack peel distance of the heat-sealable paper of the present embodiment is 150 mm or less, and the smaller the distance, the better (lower limit: 0 mm or more).
- the hot tack peel distance is 150 mm or less, a heat-sealable paper can be obtained that can enclose the object to be packaged even immediately after the bag making process.
- the lower limit is not particularly limited, it is preferably 1 mm or more, more preferably 3 mm or more from the viewpoint of manufacturing.
- the hot tack peeling distance is the peeling distance (within 1 second) immediately after the heat seal layers are heat-sealed under the conditions of 150° C., 0.2 MPa, and 1 second.
- the geometric mean of X 1 and Y 1 of the heat-sealable paper is preferably 50 J/m 2 or more, more preferably 100 J/m 2 or more, still more preferably 200 J/m 2 or more, from the viewpoint of impact resistance and processability. Even more preferably, it is 300 J/m 2 or more.
- the upper limit of the geometric mean of X 1 and Y 1 is not particularly limited, it is preferably 400 J/m 2 or less.
- the geometric mean of X 1 and Y 1 of the heat-sealable paper can be set within a desired range by adjusting the geometric mean of X 1 and Y 1 of the paper base material to be used. The method for adjusting the geometric mean of X 1 and Y 1 of the paper substrate is as described above.
- the ratio of X 1 to Y 1 of the heat seal paper is preferably 0.5 or more, more preferably 0.7 or more, from the viewpoint of impact resistance and processability. is 2.0 or less, more preferably 1.8 or less, still more preferably 1.5 or less.
- the X 1 /Y 1 of the heat-sealable paper can be adjusted to a desired range by adjusting the X 1 /Y 1 of the paper base material to be used.
- the method for adjusting X 1 /Y 1 of the paper substrate is as described above.
- X 2 is the specific tensile energy absorption in the longitudinal direction measured in accordance with JIS P 8113:2006, and the specific tensile energy in the transverse direction measured in accordance with JIS P 8113:2006.
- the energy absorption amount is Y2
- the geometric mean of X2 and Y2 is preferably 0.8 J/g or more , more preferably 1.5 J/g or more, and further preferably 1.5 J/g or more, from the viewpoint of impact resistance and processability. More preferably, it is 2.5 J/g or more.
- the upper limit of the geometric mean of X 2 and Y 2 is not particularly limited, it is preferably 5.0 J/g or less, more preferably 4.0 J/g or less.
- the geometric mean of X2 and Y2 of the heat - sealable paper can be set within a desired range by adjusting the geometric mean of X2 and Y2 of the paper substrate used. The method for adjusting the geometric mean of X2 and Y2 of the paper substrate is as described above.
- the Oken smoothness of the surface of the heat seal layer of the heat seal paper of the present embodiment is preferably 2 seconds or more, more preferably 10 seconds or more, and still more preferably 12 seconds or more from the viewpoint of improving the heat seal peel strength.
- the upper limit is not particularly limited, it is preferably 500 seconds or less, more preferably 400 seconds or less.
- Oken on the opposite side of the heat seal layer (for example, if the heat seal layer is provided only on one side of the paper base and the paper base is exposed on the other side, the surface of the paper base)
- Formula smoothness is preferably 30 seconds or more, more preferably 50 seconds or more, and still more preferably 60 seconds or more from the viewpoint of improving printability, and the upper limit is not particularly limited, but is preferably 10000 seconds or less, more preferably is 5000 seconds or less.
- the Oken smoothness is measured according to JIS P8155:2010.
- the Oken type smoothness of the heat seal layer surface and the opposite surface of the heat seal paper can be adjusted within the above range by super calendering or the like described later.
- the method for manufacturing the heat-sealable paper of this embodiment is not particularly limited.
- a cooking step of performing a cooking treatment to make the kappa number of the raw material pulp 30 or more and 60 or less a beating step of beating a dispersion liquid containing 20% by mass or more and 45% by mass or less of the cooked raw material pulp, and a beating process. and a coating step of coating at least one heat seal layer on at least one surface of the paper base material obtained by the method including the papermaking step of making paper from the raw material pulp.
- the cooking step is a step of performing a cooking treatment to make the kappa number of the raw material pulp preferably 30 or more and 60 or less.
- raw pulp having a Kappa number of 30 or more and 60 or less can be obtained by treating raw chips used as raw pulp material with a chemical solution containing sodium hydroxide.
- a treatment method using a chemical solution containing sodium hydroxide a known treatment method using a known chemical solution can be used.
- softwood pulp be the main component of raw material chips used as raw material pulp material.
- “Raw material chips mainly composed of softwood pulp” refers to raw material chips in which the softwood content is more than 50% by mass, and the softwood content is preferably 80% by mass or more, more preferably 90% by mass. % or more, more preferably 100% by mass.
- the beating step is a step of beating a dispersion containing preferably 20% by mass or more and 45% by mass or less of the raw material pulp that has been cooked.
- the method of the beating treatment is not particularly limited, but it is preferable to disperse the raw material pulp that has been digested in water to prepare a dispersion liquid having the above raw material pulp concentration and beat the dispersion.
- the beating treatment method is not particularly limited, but can be carried out using, for example, a beating machine such as a double disc refiner, a single disc refiner, or a conical refiner.
- the papermaking process is a process of making paper from the beaten raw material pulp.
- the papermaking method is not particularly limited, and examples thereof include an acidic papermaking method in which papermaking is performed at a pH of about 4.5, a neutral papermaking method in which papermaking is performed at a pH of about 6 to about 9, and the like.
- chemicals for the papermaking process such as pH adjusters, antifoaming agents, pitch control agents, and slime control agents, can be added as appropriate.
- the paper machine is also not particularly limited, and examples thereof include a continuous paper machine such as a fourdrinier type, a cylinder type, and an inclined type, or a multi-layer paper machine combining these.
- the paper substrate used for the heat-sealable paper of this embodiment can be obtained by a method including the above-described cooking step, beating step, and papermaking step. After the paper making process, if necessary, there may be a Clupak process in which the paper web is shrunk using Clupak equipment. A known Clupak equipment can be used. In addition, the manufacturing method of the paper base material used for the heat-sealable paper of embodiment is not limited to the said method.
- the method for manufacturing heat-sealable paper may include a surface treatment step of treating the surface of the paper substrate with a chemical agent.
- agents used in the surface treatment step include sizing agents, waterproof agents, water retention agents, thickeners, lubricants, and the like.
- a known device can be used as the device used in the surface treatment step.
- the method for producing the heat-sealable paper of this embodiment includes a coating step of coating a heat-sealable layer on at least one surface of the paper substrate obtained as described above.
- the heat seal layer coating solution may be applied twice or more.
- the above method of sequentially forming heat-seal layers is preferable, but the method is not limited to this, and a simultaneous multi-layer coating method may be employed.
- Simultaneous multi-layer coating method involves ejecting multiple types of coating liquids from slit-shaped nozzles separately to form a liquid laminate, which is then applied to a paper substrate to create multiple layers of heat. This is a method of forming a seal layer at the same time.
- the coating equipment for applying the heat seal layer coating liquid to the paper substrate is not particularly limited, and known equipment may be used.
- Coating equipment includes, for example, blade coaters, bar coaters, air knife coaters, slit die coaters, gravure coaters, micro gravure coaters, roll coaters, size presses, gate roll coaters and simsizers.
- the drying equipment for drying the heat seal layer is not particularly limited, and known equipment can be used. Examples of drying equipment include hot air dryers, infrared dryers, gas burners, hot plates, and the like. Moreover, the drying temperature may be appropriately set in consideration of the drying time and the like.
- the solvent for the heat seal layer coating liquid is not particularly limited, and water or organic solvents such as ethanol, isopropyl alcohol, methyl ethyl ketone, and toluene can be used. Among these, water is preferable as the dispersion medium for the heat seal layer coating liquid from the viewpoint of avoiding the problem of volatile organic solvents. That is, the heat-seal layer coating liquid is preferably a heat-seal layer water-based composition.
- the solid content (solid content concentration) of the heat seal layer coating solution is not particularly limited, and may be appropriately selected from the viewpoint of coatability and easy drying, but is preferably 3% by mass or more, more preferably 5% by mass. % or more, more preferably 10 mass % or more, and preferably 80 mass % or less, more preferably 70 mass % or less, still more preferably 60 mass % or less.
- the coating amount of the heat seal layer (after drying) is preferably 1 g/m 2 or more, more preferably 2 g/m 2 or more, more preferably 3 g/m 2 or more, and preferably 50 g/m 2 or less. , more preferably 30 g/m 2 or less, still more preferably 20 g/m 2 or less, still more preferably 15 g/m 2 or less.
- the heat seal layer may be one layer, or may be two or more layers. When the number of heat seal layers is two or more, the above coating amount represents the total coating amount.
- the super calendering process is installed independently from the paper making process.
- the paper or the like to be processed is passed between metal rolls or between a metal roll and an elastic roll, and heat, pressure, etc. are applied. It is something to do.
- Supercalendering may be performed in one stage or in multiple stages, and is not particularly limited. Super calendering is preferable because it improves the smoothness of the surface of the heat-sealing layer, resulting in an improvement in heat-seal peel strength and a reduction in hot-tack peel distance.
- the surface opposite to the heat seal layer (for example, when the heat seal layer is provided only on one side of the paper substrate and the other surface is exposed, the surface of the paper substrate) is smooth. This is preferable because the printability is improved and, as a result, the printability is improved. Furthermore, supercalendering tends to increase the density of the heat-sealed paper, and as described above, the surface smoothness is improved. Also, during heat sealing, sticking to the roll of the packaging machine and sticking of the heat-sealed papers to each other are suppressed, and processability is improved, which is preferable.
- the linear pressure in supercalendering is preferably 10 kg/cm or more, more preferably 30 kg/cm or more, still more preferably 50 kg/cm or more, and preferably 1000 kg/cm or less, more preferably 500 kg/cm or less. More preferably, it is 200 kg/cm or less.
- the above linear pressure may be appropriately changed according to the desired smoothness and density.
- the heating temperature is not particularly limited, but it is preferable from the viewpoint of preventing thermal deterioration of the paper base material and the heat seal layer and sticking of the heat seal layer while enhancing the effect of the treatment. is 20° C. or higher, more preferably 30° C. or higher, still more preferably 35° C. or higher, and is preferably 80° C. or lower, more preferably 70° C. or lower, and still more preferably 60° C. or lower.
- the heat-sealable paper according to this embodiment can be suitably used as a packaging bag for foods, daily necessities, daily necessities (soap, diapers), and the like. Therefore, the present invention also provides a packaging bag using the heat seal paper.
- Example 1 ⁇ Preparation of heat seal layer paint> Aqueous dispersion of styrene/butadiene copolymer (Nippon Zeon Co., Ltd., Nipol latex LX407S12, solid content 46%, glass transition temperature 18 ° C. (catalog value)) 98 parts (solid content conversion), paraffin wax emulsion (Chukyo Yushi Co., Ltd., Hydrin L-700, solid content 30%) 2 parts (solid content conversion) are mixed, water is added and stirred so that the solid content concentration is 33%, and the heat seal layer paint (concentration 33% ) was prepared.
- the styrene/butadiene copolymer had a solubility in water at 25° C. of 10 g/L or less.
- X 1 is the longitudinal tensile energy absorption measured in accordance with JIS P 8113:2006
- Y 1 is the transverse direction measured in accordance with JIS P 8113:2006.
- X2 is the longitudinal specific tensile energy absorption amount measured in accordance with JIS P 8113 :2006
- Y2 is the transverse tensile energy absorption amount measured in accordance with JIS P 8113:2006 is the specific tensile energy absorption in the direction.
- Example 2 ⁇ Preparation of heat seal layer paint> Aqueous dispersion of styrene/butadiene copolymer (NALSTAR SR-102 manufactured by Nippon A&L Co., Ltd., solid content 46%) 98 parts (solid content conversion), paraffin wax emulsion (manufactured by Chukyo Yushi Co., Ltd., Hydrin L-700, 2 parts (solid content: 30%) (converted to solid content) were mixed, water was added so that the solid content concentration was 33%, and the mixture was stirred to obtain a heat seal layer paint (concentration: 33%).
- the styrene/butadiene copolymer had a solubility in water at 25° C. of 10 g/L or less.
- a heat seal paper was obtained in the same manner as in Example 1, except that the above heat seal layer coating material was used.
- Example 3 ⁇ Preparation of heat seal layer paint> 98 parts of a commercially available aqueous dispersion of ethylene-acrylic acid copolymer A (converted to solid content) and 2 parts of a commercially available aqueous dispersion of carnauba wax (converted to solid content) are mixed to give a solid concentration of 35%. Sodium water was added and stirred to prepare a heat-seal layer paint (concentration: 35%). The ethylene-acrylic acid copolymer A had a solubility of 10 g/L or less in water at 25°C.
- a heat seal paper was obtained in the same manner as in Example 1 except that the heat seal layer paint was used and the coating amount of the heat seal layer after drying was 8 g/m 2 .
- Example 4 97 parts of an aqueous dispersion of ethylene-acrylic acid copolymer A (converted to solid content) and 3 parts of an aqueous dispersion of commercially available carnauba wax (converted to solid content) were mixed, and water was added so that the solid content concentration was 35%.
- a heat seal paper was obtained in the same manner as in Example 3, except that a heat seal layer paint (concentration: 35%) was prepared by adding and stirring.
- Example 6 75 parts of an aqueous dispersion of ethylene-acrylic acid copolymer A (converted to solid content) and 25 parts of an aqueous dispersion of commercially available carnauba wax (converted to solid content) were mixed, and water was added so that the solid content concentration was 35%.
- a heat seal paper was obtained in the same manner as in Example 3, except that a heat seal layer paint (concentration: 35%) was prepared by adding and stirring.
- Example 7 Preparation of heat seal layer paint> A heat seal layer coating was prepared in the same manner as in Example 3.
- the obtained heat-sealing layer coating material was coated on a super-stretch paper having a basis weight of 100 g/m 2 , a thickness of 125 ⁇ m, and a density of 0.8 g/cm 3 (manufactured by Oji Materia Co., Ltd., F surface smoothness 8 seconds, W surface smoothness 15 seconds, geometric mean of X 1 and Y 1 : 320 J/m 2 , ratio of X 1 to Y 1 (X 1 /Y 1 ): 1.2, geometric mean of X 2 and Y 2 : 3.2 J/g, Pulp type: softwood (Douglas fir) unbleached kraft pulp 100% by mass, Kappa number of raw material pulp 45, paper strength enhancer (polyacrylamide 0.8% by mass, cationized starch 0.8% by mass (total 1.6% by mass) %)), sizing agent (synthetic sizing agent 0.2% by mass), aluminum sulfate 1.
- Example 9 Heat-sealable paper was obtained in the same manner as in Example 7, except that the heat-sealable layer coating prepared in Example 5 was used instead of the heat-sealable layer coating prepared in Example 3.
- Example 10 Heat-sealable paper was obtained in the same manner as in Example 7, except that the heat-sealable layer coating prepared in Example 6 was used instead of the heat-sealable layer coating prepared in Example 3.
- the obtained heat-sealing layer coating material was coated on one-sided glossy paper (OK Blizzard (registered trademark) manufactured by Oji Materia Co., Ltd., X 1 and Y 1 ) with a basis weight of 70 g/m 2 , a thickness of 90 ⁇ m, and a density of 0.8 g/cm 3 .
- OK Blizzard registered trademark manufactured by Oji Materia Co., Ltd., X 1 and Y 1
- Example 12 68 parts of an aqueous dispersion of ethylene-acrylic acid copolymer A (in terms of solid content), 2 parts of an aqueous dispersion of commercially available carnauba wax (in terms of solid content), and kaolin (aspect ratio 80 to 100, average particle diameter 8 ⁇ m ) is mixed with 30 parts (solid content conversion) of an aqueous dispersion (solid content concentration 50%), water is added so that the solid content concentration is 25%, and the mixture is stirred to prepare a heat seal layer paint (concentration 25%).
- a heat seal paper was obtained in the same manner as in Example 11 except that
- Example 13 60 parts of an aqueous dispersion of ethylene-acrylic acid copolymer A (in terms of solid content), 10 parts of an aqueous dispersion of commercially available carnauba wax (in terms of solid content), and kaolin (aspect ratio 80 to 100, average particle size 8 ⁇ m ) is mixed with 30 parts (solid content conversion) of an aqueous dispersion (solid content concentration 50%), water is added so that the solid content concentration is 25%, and the mixture is stirred to prepare a heat seal layer paint (concentration 25%).
- a heat seal paper was obtained in the same manner as in Example 11 except that
- Example 14 42.85 parts of an aqueous dispersion of ethylene-acrylic acid copolymer A (in terms of solid content), 14.30 parts of an aqueous dispersion of commercially available carnauba wax (in terms of solid content), kaolin (aspect ratio 80 to 100, Mix 42.85 parts (solid content conversion) of water dispersion (solid content concentration 50%) with an average particle diameter of 8 ⁇ m), add water so that the solid content concentration is 25%, stir, heat seal layer paint ( A heat-sealable paper was obtained in the same manner as in Example 11, except that a concentration of 25% was prepared.
- Example 15 A heat-sealing layer paint was prepared in the same manner as in Example 1, and a heat-sealing layer was formed on the W side of the stretched paper cement with an air knife coater so that the coating weight of the heat-sealing layer after drying was 12 g/m 2 . Then, it is dried with a drier at 130 to 160°C. Finally, the line pressure is set to 90 kg/cm, and the coated surface is brought into contact with a chilled roll and the non-coated surface with a cotton roll, and the rolls are heated to 40°C. Then, one-stage super calendering treatment was performed to obtain a heat-sealable paper (smoothness of F side: 15 seconds, W side: 64 seconds). The heat-sealable paper of Example 15 had higher smoothness on the coated and uncoated surfaces than the heat-sealable paper of Example 1, and was excellent in printability on the uncoated surface.
- Example 16 A heat-sealing layer paint was prepared in the same manner as in Example 3, and a heat-sealing layer was formed on the W side of the stretched paper cement with an air knife coater so that the coating weight of the heat-sealing layer after drying was 8 g/m 2 . Then, it is dried with a drier at 130 to 160°C. Finally, the line pressure is set to 90 kg/cm, and the coated surface is brought into contact with a chilled roll and the non-coated surface with a cotton roll, and the rolls are heated to 40°C. Then, one-stage super calendering treatment was performed to obtain a heat-sealed paper (smoothness of F side: 15 seconds, W side: 52 seconds). The heat-sealable paper of Example 15 had higher smoothness on the coated and uncoated surfaces than the heat-sealable paper of Example 3, and was excellent in the printability of the uncoated surface.
- the heat-sealed test piece was cut to a width of 15 mm, T-shaped peeled at a tensile speed of 300 mm/min using a tensile tester, and the recorded maximum load was taken as the heat seal peel strength.
- FIG. 1 shows a schematic diagram of the measuring apparatus when viewed from the horizontal direction. Pulleys 3A, 3B, 3C, and 3D in FIG. 1 are attached to the hot tackiness measuring jig.
- the heat seal papers 1 and 1' were heat sealed with a seal bar 5 having a length of 30 cm and a width of 1 cm under conditions of 150° C., 0.2 MPa, and 1 second.
- the clip 2 is removed during heat sealing, and at the moment the seal bar 5 is separated (that is, immediately after heat sealing (within 1 second)), a load is applied in the direction in which the sealed portion is peeled off by weights 4 and 4 ′ attached in advance. rice field. The distance at which the seal portion was peeled was measured and defined as the hot tack peeling distance.
- Pulp recovery rate (%) ⁇ absolute dry mass (g) of heat-sealed paper subjected to test - absolute dry mass (g) of undissociated matter ⁇ / absolute dry mass of heat-sealed paper subjected to test x 100 The pulp recovery rate was calculated from
- the heat-sealable papers of Examples 1 to 16 had good heat-seal peel strength, a high pulp recovery rate after re-disintegration, and a small hot-tack peel distance.
- the heat-sealable paper of Comparative Example 1 had a large hot tack peel distance.
- the heat-sealable paper of Comparative Example 2 was poor in heat-seal peel strength.
- Examples 15 and 16, in which supercalendering was performed had higher surface smoothness than Examples 1 and 3, and were excellent in printability and processability.
- the heat-sealable paper of this embodiment has excellent heat-sealing properties and recyclability, and is capable of sealing objects to be packaged even immediately after the bag making process.
Abstract
Description
<1> 紙基材の少なくとも一方の面に少なくとも1層のヒートシール層を有するヒートシール紙であって、前記ヒートシール層は水分散性樹脂バインダーを含有し、前記ヒートシール層同士を、150℃、0.2MPa、1秒の条件でヒートシールしたときに、ホットタック剥離距離が150mm以下であり、かつ、ヒートシール剥離強度が2N/15mm以上であり、再離解後のパルプ回収率が85%以上である、ヒートシール紙。
<2> 前記水分散性樹脂バインダーのガラス転移温度が5℃以上100℃以下である、<1>に記載のヒートシール紙。
<3> 前記水分散性樹脂バインダーが、スチレン/ブタジエン系共重合体およびオレフィン/不飽和カルボン酸系共重合体よりなる群から選ばれる1種以上を含む、<1>または<2>に記載のヒートシール紙。
<4> 前記ヒートシール層の塗工量が2g/m2以上20g/m2以下である、<1>~<3>のいずれか1つに記載のヒートシール紙。
<5> 前記ヒートシール層が滑剤をさらに含有する、<1>~<4>のいずれか1つに記載のヒートシール紙。
<6> 前記滑剤が、パラフィンワックスおよびカルナバワックスよりなる群から選択される少なくとも1種である、<5>に記載のヒートシール紙。
<7> 前記ヒートシール層中の前記滑剤の含有量が0.5質量%以上30質量%以下である、<5>または<6>に記載のヒートシール紙。
<8> ヒートシール層表面の王研式平滑度が10秒以上である、<1>~<7>のいずれか1つに記載のヒートシール紙。
<9> <1>~<8>のいずれか1つに記載のヒートシール紙を用いた包装袋。
本実施形態のヒートシール紙(以下、単に「ヒートシール紙」ともいう)は、紙基材の少なくとも一方の面に少なくとも1層のヒートシール層を有するヒートシール紙であって、前記ヒートシール層は水分散性樹脂バインダーを含有し、前記ヒートシール層同士を、150℃、0.2MPa、1秒の条件でヒートシールしたときに、ホットタック剥離距離が150mm以下であり、かつ、ヒートシール剥離強度が2N/15mm以上であり、再離解後のパルプ回収率が85%以上である。本実施形態のヒートシール紙は、ヒートシール性およびリサイクル性に優れ、かつ製袋加工直後でも包装対象物の封入を成し得る。
(原料パルプ)
紙基材を構成するパルプとしては、特に制限されず、公知のパルプを使用できる。具体的には、広葉樹未晒クラフトパルプ(LUKP)、針葉樹未晒クラフトパルプ(NUKP)等の未晒パルプ;広葉樹晒クラフトパルプ(LBKP)、針葉樹晒クラフトパルプ(NBKP)等の化学パルプ;砕木パルプ(GP)、加圧式砕木パルプ(PGW)、リファイナーメカニカルパルプ(RMP)、サーモメカニカルパルプ(TMP)、ケミサーモメカニカルパルプ(CTMP)、ケミメカニカルパルプ(CMP)、ケミグランドパルプ(CGP)等の機械パルプ;古紙パルプ;ケナフ、バガス、竹、コットン等の非木材繊維パルプ;合成パルプ等が挙げられる。これらのパルプは1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。これらの中でも、広葉樹未晒クラフトパルプ(LUKP)、針葉樹未晒クラフトパルプ(NUKP)、広葉樹晒クラフトパルプ(LBKP)、針葉樹晒クラフトパルプ(NBKP)よりなる群から選択される少なくとも1種が好ましい。
JIS P 8211:2011に準拠して測定される、紙基材を構成するパルプのカッパー価は、耐衝撃性および加工性を有するヒートシール紙を得る観点から、好ましくは30以上であり、そして、好ましくは60以下、より好ましくは55以下、さらに好ましくは50以下、さらに好ましくは46以下である。紙基材を構成するパルプのカッパー価は、JIS P 8220-1:2012に準拠して離解した紙基材パルプを試料として、JIS P 8211:2011に準拠して測定される。
本実施形態のヒートシール紙に用いられる紙基材は、JIS P 8113:2006に準拠して測定される縦方向の引張エネルギー吸収量をX1、JIS P 8113:2006に準拠して測定される横方向の引張エネルギー吸収量をY1としたとき、以下の範囲を満たすことが好ましい。
紙基材のX1およびY1の相乗平均は、叩解条件やクルパック処理条件を調整することにより、調整することができる。
叩解条件については、一般的に、パルプの叩解を進めると、紙基材のX1およびY1の相乗平均は高くなる傾向にある。パルプの叩解度は、とくに限定するものではないが、カナダ標準濾水度(CSF)として、好ましくは200mL以上、より好ましくは450mL以上であり、そして、好ましくは800mL以下、より好ましくは700mL以下である。CSFは、JIS P 8121-2:2012「パルプ-ろ水度試験方法-第2部:カナダ標準ろ水度法」に従って測定される。
クルパック処理条件については、例えば、クルパック装置を使用した抄紙において、クルパック処理の前後の抄紙速度の差、ニップロールの圧力によって、紙基材のX1およびY1の相乗平均を制御しうる。
抄紙速度は特に制限されないが、例えば、好ましくは200m/分以上、より好ましくは300m/分以上、さらに好ましくは400m/分以上であり、そして、好ましくは1000m/分以下、より好ましくは800m/分以下、さらに好ましくは700m/分以下で制御すればよい。クルパック処理時のニップロールとブランケット間のニップ圧も特に制限されない。例えば、好ましくは5kN/m以上、より好ましくは10kN/m以上であり、そして、好ましくは50kN/m以下、より好ましくは25kN/m以下の範囲で適宜制御すればよい。
クルパック処理の前後の速度差は、特に制限されず、坪量やパルプの材料に応じて、所望の紙基材のX1およびY1の相乗平均が得られるように制御すればよい。速度差が大きい方が紙基材のX1およびY1の相乗平均が高くなるが、速度差が大きすぎると断紙などの操業における不具合が発生するため、好ましくは-45.0%以上、より好ましくは-40.0%以上であり、そして、好ましくは-10.0%以下、より好ましくは-15.0%以下である。ここでのマイナス「-」はクルパック処理後の速度が遅いことを示す。
カレンダー処理によるニップ圧も、特に制限されず、坪量やパルプの材料、クルパック処理の前後の速度差などに応じて、所望の紙基材のX1およびY1の相乗平均が得られるように制御すればよい。好ましくは100kN/m以上、より好ましくは130kN/m以上であり、そして、好ましくは200kN/m以下、より好ましくは170kN/m以下である。
紙基材のX1/Y1は、ジェットワイヤー比(パルプ懸濁液の噴出速度/ワイヤーの速度)を調整することにより、調整することができる。一般的に、ジェットワイヤー比が1に近づくほど、紙基材のX1/Y1は小さくなる傾向にある。
本実施形態のヒートシール紙に用いられる紙基材は、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をX2、JIS P 8113:2006に準拠して測定される横方向の比引張エネルギー吸収量をY2としたとき、X2およびY2の相乗平均は、耐衝撃性および加工適性の観点から、好ましくは0.8J/g以上、より好ましくは1.5J/g以上、さらに好ましくは2.5J/g以上である。X2およびY2の相乗平均の上限は、特に限定されないが、好ましくは5.0J/g以下、より好ましくは4.0J/g以下である。
紙基材のX2およびY2の相乗平均は、叩解条件やクルパック処理条件を調整することにより、調整することができる。
叩解条件については、一般的に、パルプの叩解を進めると、紙基材のX2およびY2の相乗平均は高くなる傾向にある。パルプの叩解度は、とくに限定するものではないが、カナダ標準濾水度(CSF)として、好ましくは200mL以上、より好ましくは450mL以上であり、そして、好ましくは800mL以下、より好ましくは700mL以下である。CSFは、JIS P 8121-2:2012「パルプ-ろ水度試験方法-第2部:カナダ標準ろ水度法」に従って測定される。
クルパック処理条件については、例えば、クルパック装置を使用した抄紙において、クルパック処理の前後の抄紙速度の差、ニップロールの圧力によって、紙基材のX2およびY2の相乗平均を制御しうる。
抄紙速度は特に制限されないが、例えば、好ましくは200m/分以上、より好ましくは300m/分以上、さらに好ましくは400m/分以上であり、そして、好ましくは1000m/分以下、より好ましくは800m/分以下、さらに好ましくは700m/分以下である。クルパック処理時のニップロールとブランケット間のニップ圧も特に制限されない。例えば、好ましくは5kN/m以上、より好ましくは10kN/m以上であり、そして、好ましくは50kN/m以下、より好ましくは25kN/m以下である。
クルパック処理の前後の速度差は、特に制限されず、坪量やパルプの材料に応じて、所望の紙基材のX2およびY2の相乗平均が得られるように制御すればよい。速度差が大きい方が紙基材のX2およびY2の相乗平均が高くなるが、速度差が大きすぎると断紙などの操業における不具合が発生するため、好ましくは-45.0%以上、より好ましくは-40.0%以上であり、そして、好ましくは-10.0%以下、より好ましくは-15.0%以下である。ここでのマイナス「-」はクルパック処理後の速度が遅いことを示す。
カレンダー処理によるニップ圧も、特に制限されず、坪量やパルプの材料、クルパック処理の前後の速度差などに応じて、所望の紙基材のX2およびY2の相乗平均が得られるように制御すればよい。好ましくは100kN/m以上、より好ましくは130kN/m以上であり、そして、好ましくは200kN/m以下、より好ましくは170kN/m以下である。
紙基材の坪量は、特に限定されないが、耐衝撃性および加工性を有するヒートシール紙を得る観点から、好ましくは50g/m2以上、より好ましくは60g/m2以上、さらに好ましくは70g/m2以上であり、そして、好ましくは150g/m2以下、より好ましくは140g/m2以下、さらに好ましくは120g/m2以下である。紙基材の坪量は、JIS P 8124:2011に準拠して測定される。
紙基材の厚さは、耐衝撃性および加工性を有するヒートシール紙を得る観点から、好ましくは20μm以上、より好ましくは30μm以上、さらに好ましくは40μm以上、さらにより好ましくは60μm以上、より一層好ましくは80μm以上であり、そして、好ましくは200μm以下、より好ましくは180μm以下、さらに好ましくは160μm以下である。紙基材の厚さは、JIS P 8118:2014に準拠して測定される。
紙基材の密度は、成形加工性の観点から、好ましくは0.3g/cm3以上、より好ましくは0.5g/cm3以上であり、そして、好ましくは1.2g/cm3以下、より好ましくは1.0g/cm3以下である。紙基材の密度は、上述した測定方法により得られた、紙基材の坪量および厚さから算出される。
紙基材には、必要に応じて、たとえば、アニオン性、カチオン性もしくは両性の歩留剤、濾水性向上剤、乾燥紙力増強剤、湿潤紙力増強剤、サイズ剤、填料等の内添助剤、耐水化剤、染料、蛍光増白剤等の任意成分を含んでいてもよい。
本実施形態のヒートシール紙は、紙基材の少なくとも一方の面に、少なくとも1層のヒートシール層を有する。ヒートシール層は、加熱、超音波等で溶融し、接着する層である。
ヒートシール層は、水分散性樹脂バインダーを含有する。水分散性樹脂バインダーとは、水溶性ではない(具体的には、25℃の水に対する溶解度が10g/L以下である)が、エマルションやサスペンションのように水中で微分散された状態となる樹脂バインダーをいう。水分散性樹脂バインダーを用いてヒートシール層を水系塗工することで、再離解性に優れ、紙として再生利用可能なヒートシール紙を得ることができる。なお、水分散性樹脂バインダーが下記の滑剤にも該当する場合は、滑剤に分類するものとする。
ヒートシール紙の滑り性付与およびブロッキング抑制の観点から、ヒートシール層は、上記の水分散性樹脂バインダーに加えて、滑剤を含有することが好ましい。滑剤とは、ヒートシール層に配合することにより、ヒートシール層表面の摩擦係数を低減させることができる物質である。
本実施形態において、ヒートシール層は、上記水分散性樹脂バインダーに加えて、顔料を含有してもよい。顔料を含有することにより、ヒートシール紙を製造する際に、ヒートシール層塗工面が、ヒートシール紙の裏面に貼り付き、剥がれが生じる(ブロッキングする)という問題が抑制され、耐ブロッキング性に優れたヒートシール紙が得られる。また、顔料を適量添加することで、リサイクル性も向上する。
ヒートシール層は、上記水分散性樹脂バインダー、顔料、および滑剤に加えて、他の成分を含有してもよい。他の成分としては、たとえば、シランカップリング剤;消泡剤;粘度調整剤;界面活性剤、アルコール等のレベリング剤;着色染料等の着色剤などが例示される。
(再離解後のパルプ回収率)
本実施形態のヒートシール紙は、再離解後のパルプ回収率が、85%以上であり、90%以上であることがより好ましく、95%以上であることがさらに好ましく、98%以上であることがさらにより好ましい。再離解後のパルプ回収率が上記範囲内であれば、リサイクル性に優れる。ヒートシール紙の再離解後のパルプ回収率は、後述の実施例に記載の方法により測定される値である。
本実施形態のヒートシール紙は、ヒートシール層の剥離強度が、2N/15mm以上、好ましくは4N/15mm以上、より好ましくは6N/15mm以上であり、そして好ましくは10N/15mm以下、より好ましくは9.5N/mm以下、さらに好ましくは9.0N/15mm以下、さらにより好ましくは8.5N/15mm以下、より一層好ましくは8.0N/15mm以下である。ヒートシール層の剥離強度は、ヒートシール層同士を150℃、0.2MPa、1秒の条件でヒートシールした際の剥離強度であり、具体的には後述の実施例に記載の方法によって測定される値である。
水分散性樹脂バインダーのガラス転移温度および種類を選択することによって、剥離強度を調整することができる。たとえば、水分散性樹脂バインダーのガラス転移温度を100℃以下とすることで、所定のヒートシール条件で樹脂が溶融してヒートシール層同士が良好に接着するため、所望の剥離強度を確保することができる。
本実施形態のヒートシール紙のホットタック剥離距離は、150mm以下であり、小さければ小さいほど好ましい(下限:0mm以上)。ホットタック剥離距離が150mm以下であると、製袋加工直後でも包装対象物の封入を成し得るヒートシール紙が得られる。また、下限は特に限定されないが、製造上の観点から、好ましくは1mm以上、より好ましくは3mm以上である。ホットタック剥離距離は、ヒートシール層同士を150℃、0.2MPa、1秒の条件でヒートシールした直後(1秒以内)の剥離距離であり、具体的には後述の実施例に記載の方法によって測定される値である。
水分散性樹脂バインダーのガラス転移温度および種類を選択することによって、ホットタック剥離距離を調整することができる。たとえば、水分散性樹脂バインダーのガラス転移温度を5℃以上とすることで、ヒートシール時の加熱から解放された直後に樹脂が速やかに固化し、ヒートシール層同士の接着が維持されるため、ホットタック剥離距離を小さく抑えることができる。
本実施形態のヒートシール紙は、JIS P 8113:2006に準拠して測定される縦方向の引張エネルギー吸収量をX1、JIS P 8113:2006に準拠して測定される横方向の引張エネルギー吸収量をY1としたとき、以下の範囲を満たすことが好ましい。
ヒートシール紙のX1およびY1の相乗平均は、使用する紙基材のX1およびY1の相乗平均を調整することで、所望の範囲とすることができる。紙基材のX1およびY1の相乗平均の調整方法は上述のとおりである。
ヒートシール紙のX1/Y1は、使用する紙基材のX1/Y1を調整することで、所望の範囲とすることができる。紙基材のX1/Y1の調整方法は上述のとおりである。
本実施形態のヒートシール紙は、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をX2、JIS P 8113:2006に準拠して測定される横方向の比引張エネルギー吸収量をY2としたとき、X2およびY2の相乗平均は、耐衝撃性および加工適性の観点から、好ましくは0.8J/g以上、さらに好ましくは1.5J/g以上、さらにより好ましくは2.5J/g以上である。X2およびY2の相乗平均の上限は、特に限定されないが、好ましくは5.0J/g以下、より好ましくは4.0J/g以下である。
ヒートシール紙のX2およびY2の相乗平均は、使用する紙基材のX2およびY2の相乗平均を調整することで、所望の範囲とすることができる。紙基材のX2およびY2の相乗平均の調整方法は上述のとおりである。
本実施形態のヒートシール紙のヒートシール層表面の王研式平滑度は、ヒートシール剥離強度を向上させる観点から、好ましくは2秒以上、より好ましくは10秒以上、さらに好ましくは12秒以上であり、上限は特に限定されないが、好ましくは500秒以下、より好ましくは400秒以下である。
また、ヒートシール層と反対面(たとえば、紙基材の一方の面のみにヒートシール層が設けられ、他方の面は紙基材が露出している場合は、紙基材表面)の王研式平滑度は、印刷適性を向上させる観点から、好ましくは30秒以上、より好ましくは50秒以上、さらに好ましくは60秒以上であり、上限は特に限定されないが、好ましくは10000秒以下、より好ましくは5000秒以下である。
王研式平滑度は、JIS P8155:2010に準拠して測定される。
ヒートシール紙のヒートシール層表面および反対面の王研式平滑度は、後述するスーパーカレンダー処理等により、上記範囲内に調整することができる。
本実施形態のヒートシール紙の製造方法は、特に限定されない。たとえば、原料パルプのカッパー価を30以上60以下とする蒸解処理を行なう蒸解工程と、蒸解処理した原料パルプを20質量%以上45質量%以下含有する分散液を叩解処理する叩解工程と、叩解処理した原料パルプを抄紙する抄紙工程と、を含む方法により得られた紙基材の少なくとも一方の面上に、少なくとも1層のヒートシール層を塗工する塗工工程を含む製造方法が挙げられる。当該製造方法のそれぞれの工程について、以下に説明する。
蒸解工程は、原料パルプのカッパー価を好ましくは30以上60以下とする蒸解処理を行なう工程である。特に限定されないが、原料パルプの材料として用いられる原料チップを、水酸化ナトリウムを含む薬液で処理することにより、カッパー価が30以上60以下である原料パルプが得られる。水酸化ナトリウムを含む薬液による処理方法としては、公知の薬液を使用する公知の処理方法を用いることができる。
叩解工程は、蒸解処理した原料パルプを好ましくは20質量%以上45質量%以下含有する分散液を叩解処理する工程である。叩解処理の方法は特に限定されないが、蒸解処理した原料パルプを水中に分散させて、上記の原料パルプ濃度の分散液を作製し、叩解することが好ましい。叩解処理方法としては、特に限定されないが、たとえば、ダブルディスクリファイナー、シングルディスクリファイナー、コニカルリファイナー等の叩解機を用いて行うことができる。
抄紙工程は、叩解処理した原料パルプを抄紙する工程である。抄紙方法については、特に限定されず、たとえばpHが4.5付近で抄紙を行う酸性抄紙法、pHが約6~約9で抄紙を行う中性抄紙法等が挙げられる。抄紙工程では、必要に応じて、pH調整剤、消泡剤、ピッチコントロール剤、スライムコントロール剤等の抄紙工程用薬剤を適宜添加できる。抄紙機についても、特に限定されず、たとえば長網式、円網式、傾斜式等の連続抄紙機、またはこれらを組み合わせた多層抄き合わせ抄紙機等が挙げられる。
スーパーカレンダー処理を行うことによって、ヒートシール層表面の平滑性が向上し、その結果、ヒートシール剥離強度の向上、およびホットタック剥離距離の減少につながるので好ましい。
また、ヒートシール層とは反対面(たとえば、紙基材の一方の面のみにヒートシール層が設けられ、他方の面は紙基材が露出している場合は、紙基材表面)の平滑性が向上し、その結果、印刷適性が向上するので好ましい。
さらに、スーパーカレンダー処理を行うことによって、ヒートシール紙の密度が上がる傾向があり、また、上述したように表面平滑性が向上することから、製袋の際に、包装機におけるヒートシール紙の送り出しや、ヒートシールの際に、包装機のロールへの貼り付きやヒートシール紙同士の貼り付きが抑制され、加工適性が向上するので好ましい。
スーパーカレンダー処理における線圧は、好ましくは10kg/cm以上、より好ましくは30kg/cm以上、さらに好ましくは50kg/cm以上であり、そして、好ましくは1000kg/cm以下、より好ましくは500kg/cm以下、さらに好ましくは200kg/cm以下である。ただし、上記の線圧は、所望の平滑度や密度に応じて適宜変更すればよい。
また、スーパーカレンダー処理において加熱を行う場合、加熱温度は特に限定されないが、処理の効果を高めつつ、紙基材やヒートシール層の熱による劣化やヒートシール層の貼り付きを防ぐ観点から、好ましくは20℃以上、より好ましくは30℃以上、さらに好ましくは35℃以上であり、そして、好ましくは80℃以下、より好ましくは70℃以下、さらに好ましくは60℃以下である。
本実施形態に係るヒートシール紙は、食品、生活雑貨、日用品(石鹸、おむつ)などの包装袋として好適に使用できる。したがって、本発明は、上記ヒートシール紙を用いた包装袋についても提供する。
<ヒートシール層塗料の調製>
スチレン/ブタジエン系共重合体の水分散液(日本ゼオン株式会社製、NipolラテックスLX407S12、固形分46%、ガラス転移温度18℃(カタログ値))98部(固形分換算)、パラフィンワックスエマルション(中京油脂株式会社製、ハイドリンL-700、固形分30%)2部(固形分換算)を混合し、固形分濃度が33%になるよう水を加えて撹拌し、ヒートシール層塗料(濃度33%)を調製した。上記スチレン/ブタジエン系共重合体は、25℃の水に対する溶解度が10g/L以下であった。
得られたヒートシール層塗料を、坪量88g/m2、厚さ135μm、密度0.6g/cm3の伸張紙セメント(王子マテリア株式会社製、F面平滑度4秒、W面平滑度8秒、X1およびY1の相乗平均:178J/m2、Y1に対するX1の比(X1/Y1):1.5、X2およびY2の相乗平均:2.1J/g、パルプ種:針葉樹(ダグラスファー)未晒クラフトパルプ100質量部、原料パルプのカッパー価45、紙力増強剤(ポリアクリルアミド0.8質量部、カチオン化澱粉0.8質量部(計1.6質量部))、サイズ剤(合成サイズ剤0.2質量部)、硫酸バンド1.0質量部)のW面にヒートシール層の乾燥後の塗工量が12g/m2となるように、エアナイフコーターでヒートシール層を形成し、130~160℃のドライヤーで乾燥し、ヒートシール紙を得た。
<ヒートシール層塗料の調製>
スチレン/ブタジエン系共重合体の水分散液(日本エイアンドエル株式会社製ナルスターSR-102、固形分46%)98部(固形分換算)、パラフィンワックスエマルション(中京油脂株式会社製、ハイドリンL-700、固形分30%)2部(固形分換算)を混合し、固形分濃度が33%になるよう水を加えて撹拌しヒートシール層塗料(濃度33%)を得た。上記スチレン/ブタジエン系共重合体は、25℃の水に対する溶解度が10g/L以下であった。
上記ヒートシール層塗料を用いたこと以外は実施例1と同様にして、ヒートシール紙を得た。
<ヒートシール層塗料の調製>
市販のエチレン-アクリル酸共重合体Aの水分散液98部(固形分換算)と、市販のカルナバワックスの水分散液2部(固形分換算)を混合し、固形分濃度が35%になるよう水を加えて撹拌し、ヒートシール層塗料(濃度35%)を調製した。エチレン-アクリル酸共重合体Aは、25℃の水に対する溶解度が10g/L以下であった。
上記ヒートシール層塗料を用い、ヒートシール層の乾燥後の塗工量を8g/m2とした以外は実施例1と同様にしてヒートシール紙を得た。
エチレン-アクリル酸共重合体Aの水分散液97部(固形分換算)と、市販のカルナバワックスの水分散液3部(固形分換算)を混合し、固形分濃度が35%になるよう水を加えて撹拌し、ヒートシール層塗料(濃度35%)を調製したこと以外は、実施例3と同様にして、ヒートシール紙を得た。
エチレン-アクリル酸共重合体Aの水分散液86部(固形分換算)と、市販のカルナバワックスの水分散液14部(固形分換算)を混合し、固形分濃度が35%になるよう水を加えて撹拌し、ヒートシール層塗料(濃度35%)を調製したこと以外は、実施例3と同様にして、ヒートシール紙を得た。
エチレン-アクリル酸共重合体Aの水分散液75部(固形分換算)と、市販のカルナバワックスの水分散液25部(固形分換算)を混合し、固形分濃度が35%になるよう水を加えて撹拌し、ヒートシール層塗料(濃度35%)を調製したこと以外は、実施例3と同様にして、ヒートシール紙を得た。
<ヒートシール層塗料の調製>
実施例3と同様にしてヒートシール層塗料を調製した。
得られたヒートシール層塗料を、坪量100g/m2、厚さ125μm、密度0.8g/cm3の超伸張紙(王子マテリア株式会社製、F面平滑度8秒、W面平滑度15秒、X1およびY1の相乗平均:320J/m2、Y1に対するX1の比(X1/Y1):1.2、X2およびY2の相乗平均:3.2J/g、パルプ種:針葉樹(ダグラスファー)未晒クラフトパルプ100質量%、原料パルプのカッパー価45、紙力増強剤(ポリアクリルアミド0.8質量%、カチオン化澱粉0.8質量%(計1.6質量%))、サイズ剤(合成サイズ剤0.2質量%)、硫酸バンド1.0質量%)のW面にヒートシール層の乾燥後の塗工量が8g/m2となるように、エアナイフコーターでヒートシール層を形成し、ヒートシール紙を得た。
実施例3で調製したヒートシール層塗料の代わりに、実施例4で調製したヒートシール層塗料を用いたこと以外は、実施例7と同様にして、ヒートシール紙を得た。
実施例3で調製したヒートシール層塗料の代わりに、実施例5で調製したヒートシール層塗料を用いたこと以外は、実施例7と同様にして、ヒートシール紙を得た。
実施例3で調製したヒートシール層塗料の代わりに、実施例6で調製したヒートシール層塗料を用いたこと以外は、実施例7と同様にして、ヒートシール紙を得た。
<ヒートシール層塗料の調製>
エチレン-アクリル酸共重合体Aの水分散液69部(固形分換算)と、市販のカルナバワックスの水分散液1部(固形分換算)と、カオリン(アスペクト比80~100、平均粒子径8μm)の水分散液(固形分濃度50%)30部(固形分換算)を混合し、固形分濃度が25%になるよう水を加えて撹拌し、ヒートシール層塗料(濃度25%)を調製した。
得られたヒートシール層塗料を、坪量70g/m2、厚さ90μm、密度0.8g/cm3の片艶紙(王子マテリア株式会社製OKブリザード(登録商標)、X1およびY1の相乗平均:71J/m2、Y1に対するX1の比(X1/Y1):0.7、X2およびY2の相乗平均:1.0J/g)のザラ面(艶面の反対側)にヒートシール層の乾燥後の塗工量が4g/m2となるように、エアナイフコーターでヒートシール層を形成した。
エチレン-アクリル酸共重合体Aの水分散液68部(固形分換算)と、市販のカルナバワックスの水分散液2部(固形分換算)と、カオリン(アスペクト比80~100、平均粒子径8μm)の水分散液(固形分濃度50%)30部(固形分換算)を混合し、固形分濃度が25%になるよう水を加えて撹拌し、ヒートシール層塗料(濃度25%)を調製したこと以外は、実施例11と同様にして、ヒートシール紙を得た。
エチレン-アクリル酸共重合体Aの水分散液60部(固形分換算)と、市販のカルナバワックスの水分散液10部(固形分換算)と、カオリン(アスペクト比80~100、平均粒子径8μm)の水分散液(固形分濃度50%)30部(固形分換算)を混合し、固形分濃度が25%になるよう水を加えて撹拌し、ヒートシール層塗料(濃度25%)を調製したこと以外は、実施例11と同様にして、ヒートシール紙を得た。
エチレン-アクリル酸共重合体Aの水分散液42.85部(固形分換算)と、市販のカルナバワックスの水分散液14.30部(固形分換算)と、カオリン(アスペクト比80~100、平均粒子径8μm)の水分散液(固形分濃度50%)42.85部(固形分換算)を混合し、固形分濃度が25%になるよう水を加えて撹拌し、ヒートシール層塗料(濃度25%)を調製したこと以外は、実施例11と同様にして、ヒートシール紙を得た。
実施例1と同様にして、ヒートシール層塗料を調製し、伸張紙セメントのW面にヒートシール層の乾燥後の塗工量が12g/m2となるようにエアナイフコーターでヒートシール層を形成し、130~160℃のドライヤーで乾燥し、最後に線圧90kg/cmとなるようにして、塗工面にチルドロール、非塗工面にコットンロールが接触するようにし、ロールを40℃に加温して1段のスーパーキャレンダー処理を行い、ヒートシール紙(平滑度F面15秒、W面64秒)を得た。実施例15のヒートシール紙は、実施例1のヒートシール紙に比べて、塗工面および非塗工面の平滑度が高く、非塗工面の印刷適性に優れていた。
実施例3と同様にして、ヒートシール層塗料を調製し、伸張紙セメントのW面にヒートシール層の乾燥後の塗工量が8g/m2となるようにエアナイフコーターでヒートシール層を形成し、130~160℃のドライヤーで乾燥し、最後に線圧90kg/cmとなるようにして、塗工面にチルドロール、非塗工面にコットンロールが接触するようにし、ロールを40℃に加温して1段のスーパーキャレンダー処理を行い、ヒートシール紙(平滑度F面15秒、W面52秒)を得た。実施例15のヒートシール紙は、実施例3のヒートシール紙に比べて、塗工面および非塗工面の平滑度が高く、非塗工面の印刷適性に優れていた。
エチレン-酢酸ビニル共重合体の水分散液(住化ケムテックス株式会社製、スミカフレックスS-470HQ、固形分55%)98部(固形分換算)、パラフィンワックスエマルション(中京油脂株式会社製、ハイドリンL-700、固形分30%)2部(固形分換算)を混合し、固形分濃度が33%になるよう水を加えて撹拌し、ヒートシール層塗料(濃度33%)を調製したこと以外は、実施例1と同様にして、ヒートシール紙を得た。
スチレン/アクリル系共重合体の水分散液(BASFジャパン株式会社製、JONCRYL 70J、固形分30%)98部(固形分換算)、パラフィンワックスエマルション(中京油脂株式会社製、ハイドリンL-700、固形分30%)2部(固形分換算)を混合し、固形分濃度が33%になるよう水を加えて撹拌し、ヒートシール層塗料(濃度33%)を調製したこと以外は、実施例1と同様にして、ヒートシール紙を得た。
<ヒートシール剥離強度の測定>
2枚1組のヒートシール紙を、ヒートシール層が向き合うように重ね、ヒートシールテスター(テスター産業製、TP-701-B)を用いて、150℃、0.2MPa、1秒の条件でヒートシールした。ヒートシールされた試験片を温度23℃±1℃、湿度50%±2%の室内で4時間以上静置した。続いて、ヒートシールされた試験片を15mm幅にカットし、引張試験機を用いて、引張速度300mm/minでT字剥離し、記録された最大荷重をヒートシール剥離強度とした。
ヒートシールテスター(テスター産業株式会社製、TP-701-B)およびホットタック性測定冶具(テスター産業株式会社製、TP-704)を用いて、ホットタック剥離距離を測定した。当該測定装置を水平方向から見たときの模式図を図1に示す。図1の滑車3A、3B、3C、3Dは、上記のホットタック性測定冶具に付属されている。長さ60cm、幅4cmに裁断した2枚のヒートシール紙1、1’を、ヒートシール層が向き合うように重ね、長さ方向の中央あたりを市販のクリップ2で挟み、滑車3A、3Bの間に通した。次に、ヒートシール紙1を滑車3Cの上部に沿わせ、その末端に30gの重り4を取り付けた。また、ヒートシール紙1’を滑車3Dの上部に沿わせ、その末端に30gの重り4’を取り付けた。ヒートシールテスターを用いて、長さ30cm、幅1cmのシールバー5で150℃、0.2MPa、1秒の条件で、ヒートシール紙1、1’をヒートシールした。ヒートシール中にクリップ2を外し、シールバー5が離れた瞬間(すなわちヒートシール直後(1秒以内))に、予めつけておいた重り4、4’によってシール部が剥離する方向に荷重をかけた。シール部が剥離した距離を測定し、ホットタック剥離距離とした。
絶乾質量30gのヒートシール紙を手で3~4cm角に破き、20℃の水道水に一晩浸漬した。ヒートシール紙の濃度が2.5%になるよう水道水で希釈後、TAPPI標準離解機(熊谷理機株式会社製)を用いて3000rpmの回転数で20分間離解処理した。得られたパルプスラリーを6カット(スリット幅0.15mm)のスクリーンプレートをセットしたフラットスクリーン(熊谷理機株式会社製)に供し、8.3L/minの水流中で精選処理した。スクリーンプレート上に残った未離解物を回収して105℃のオーブンで乾燥して絶乾質量を測定し、以下の計算式:
パルプ回収率(%)={試験に供したヒートシール紙の絶乾質量(g)-未離解物の絶乾質量(g)}/試験に供したヒートシール紙の絶乾質量×100
からパルプ回収率を算出した。
ヒートシール紙および紙基材について、JIS P8155:2010に準じて王研式平滑度測定を行い、平滑度の値とした。
高速横型ピロー包装機(αWrapper FW3410、株式会社フジキカイ製)を用いて、ヒートシール紙を連続で製袋した。この時中身は入れず、空袋で成形をし、外観および操業性を見て以下の判断を行った。ここで、「連続して製袋が不可能」とは、シワが発生したり、蛇行して袋にならない状態になってしまったり、断紙が起きたりする状態をいう。また、「外観が不良」とは、しわの混入、シール部のずれ、または袋の変形をいう。
A:連続して製袋が可能であり、かつ袋の外観が良好であった。
B:連続して製袋は可能であるが、袋の外観に不良がわずかにあった。
C:連続して製袋が不可能であった。
2:クリップ
3A、3B、3C、3D:滑車
4、4’:重り
5:シールバー
Claims (8)
- 紙基材の少なくとも一方の面に少なくとも1層のヒートシール層を有するヒートシール紙であって、
前記ヒートシール層は水分散性樹脂バインダーを含有し、
前記ヒートシール層同士を、150℃、0.2MPa、1秒の条件でヒートシールしたときに、ホットタック剥離距離が150mm以下であり、かつ、ヒートシール剥離強度が2N/15mm以上であり、
再離解後のパルプ回収率が85%以上である、ヒートシール紙。 - 前記水分散性樹脂バインダーのガラス転移温度が5℃以上100℃以下である、請求項1に記載のヒートシール紙。
- 前記水分散性樹脂バインダーが、スチレン/ブタジエン系共重合体およびオレフィン/不飽和カルボン酸系共重合体よりなる群から選ばれる1種以上を含む、請求項1または2に記載のヒートシール紙。
- 前記ヒートシール層が滑剤をさらに含有する、請求項1~3のいずれか1項に記載のヒートシール紙。
- 前記滑剤が、カルナバワックスおよびパラフィンワックスよりなる群から選択される少なくとも1種である、請求項4に記載のヒートシール紙。
- 前記ヒートシール層中の前記滑剤の含有量が0.5質量%以上30質量%以下である、請求項4または5に記載のヒートシール紙。
- ヒートシール層表面の王研式平滑度が10秒以上である、請求項1~6のいずれか1項に記載のヒートシール紙。
- 請求項1~7のいずれか1項に記載のヒートシール紙を用いた包装袋。
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Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0319964B2 (ja) | 1982-12-10 | 1991-03-18 | Toyoda Chuo Kenkyusho Kk | |
JPH07502463A (ja) * | 1991-10-22 | 1995-03-16 | インターナショナル・ペーパー・カンパニー | 改良された平滑性特徴を有する感熱性記録要素 |
JPH07507504A (ja) * | 1992-06-03 | 1995-08-24 | インターナショナル・ペーパー・カンパニー | 感熱記録要素 |
JPH09295383A (ja) * | 1996-05-01 | 1997-11-18 | Dainippon Printing Co Ltd | 光隠蔽性を有するインモールドラベル |
JPH10157279A (ja) * | 1996-11-29 | 1998-06-16 | Mitsubishi Paper Mills Ltd | 記録用紙 |
JP2000109007A (ja) * | 1998-09-30 | 2000-04-18 | Nippon Paper Industries Co Ltd | 易剥離面の形成方法及び易開封性容器 |
JP2002293365A (ja) * | 2001-03-29 | 2002-10-09 | Nippon Joho Youshi Kako Kk | 紙製帯束バンド |
WO2013069704A1 (ja) * | 2011-11-07 | 2013-05-16 | 凸版印刷株式会社 | 蓄電デバイス用外装材 |
JP2018053400A (ja) * | 2016-09-30 | 2018-04-05 | 王子ホールディングス株式会社 | ヒートシールシートおよび包装体 |
JP2021046233A (ja) * | 2019-09-20 | 2021-03-25 | 北越コーポレーション株式会社 | 包装用紙 |
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JP6911659B2 (ja) * | 2017-09-13 | 2021-07-28 | 株式会社リコー | 情報処理装置、情報処理システム及びプログラム |
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2021
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2022
- 2022-04-22 WO PCT/JP2022/018533 patent/WO2022225042A1/ja active Application Filing
- 2022-04-22 EP EP22791813.3A patent/EP4328022A1/en active Pending
- 2022-04-22 AU AU2022262551A patent/AU2022262551A1/en active Pending
- 2022-04-22 CN CN202280029443.6A patent/CN117203393A/zh active Pending
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Patent Citations (10)
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JPH0319964B2 (ja) | 1982-12-10 | 1991-03-18 | Toyoda Chuo Kenkyusho Kk | |
JPH07502463A (ja) * | 1991-10-22 | 1995-03-16 | インターナショナル・ペーパー・カンパニー | 改良された平滑性特徴を有する感熱性記録要素 |
JPH07507504A (ja) * | 1992-06-03 | 1995-08-24 | インターナショナル・ペーパー・カンパニー | 感熱記録要素 |
JPH09295383A (ja) * | 1996-05-01 | 1997-11-18 | Dainippon Printing Co Ltd | 光隠蔽性を有するインモールドラベル |
JPH10157279A (ja) * | 1996-11-29 | 1998-06-16 | Mitsubishi Paper Mills Ltd | 記録用紙 |
JP2000109007A (ja) * | 1998-09-30 | 2000-04-18 | Nippon Paper Industries Co Ltd | 易剥離面の形成方法及び易開封性容器 |
JP2002293365A (ja) * | 2001-03-29 | 2002-10-09 | Nippon Joho Youshi Kako Kk | 紙製帯束バンド |
WO2013069704A1 (ja) * | 2011-11-07 | 2013-05-16 | 凸版印刷株式会社 | 蓄電デバイス用外装材 |
JP2018053400A (ja) * | 2016-09-30 | 2018-04-05 | 王子ホールディングス株式会社 | ヒートシールシートおよび包装体 |
JP2021046233A (ja) * | 2019-09-20 | 2021-03-25 | 北越コーポレーション株式会社 | 包装用紙 |
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AU2022262551A1 (en) | 2023-11-09 |
JP2022168003A (ja) | 2022-11-04 |
JP7070785B1 (ja) | 2022-05-18 |
JP2022167766A (ja) | 2022-11-04 |
CN117203393A (zh) | 2023-12-08 |
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