CN113195829B - Coated paper for tableware - Google Patents
Coated paper for tableware Download PDFInfo
- Publication number
- CN113195829B CN113195829B CN201980078217.5A CN201980078217A CN113195829B CN 113195829 B CN113195829 B CN 113195829B CN 201980078217 A CN201980078217 A CN 201980078217A CN 113195829 B CN113195829 B CN 113195829B
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- Prior art keywords
- tableware
- coated paper
- paper
- bleached kraft
- kraft pulp
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47G—HOUSEHOLD OR TABLE EQUIPMENT
- A47G19/00—Table service
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
- D21H11/04—Kraft or sulfate pulp
-
- 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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
-
- 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
- D21H27/30—Multi-ply
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Paper (AREA)
- Table Devices Or Equipment (AREA)
Abstract
The present invention relates to a coated paper for tableware, which has a pair of surface layers and a plurality of intermediate layers disposed between the pair of surface layers, wherein the surface layers and the intermediate layers mainly comprise softwood bleached kraft pulp and hardwood bleached kraft pulp, the mass ratio of the softwood bleached kraft pulp to the hardwood bleached kraft pulp in the surface layers is 5/95 or more and 15/85 or less, the mass ratio of the softwood bleached kraft pulp to the hardwood bleached kraft pulp in the intermediate layers is 30/70 or more and 40/60 or less, and the surface layers have surface coating layers containing completely saponified polyvinyl alcohol on the surfaces. The coating amount of the surface coating layer is preferably 1g/m 2 Above and 5g/m 2 The following. The ratio of the total basis weight of the pair of surface layers to the total basis weight is preferably 25.0% or more and 35.0% or less.
Description
Technical Field
The invention relates to coated paper for tableware.
Background
At present, tableware made of plastic resin is widely used as disposable tableware. Further, the conventional plastic resin and bamboo and wooden materials require special molding when used as a cutter, and therefore, have a problem of high manufacturing cost. In addition, plastic products have an influence on the ecosystem of marine life by causing marine pollution, and therefore, in recent years, from the viewpoint of environmental protection, alternative technologies for plastic tableware have been sought. In europe in particular, environmentally friendly, recyclable paper products are being sought. In contrast, a paper stirring bar and a spoon having improved water resistance and hot water resistance have been proposed as alternative materials (see, for example, patent document 1).
Documents of the prior art
Patent document
Patent document 1: japanese unexamined patent publication No. 2003-79505
Disclosure of Invention
Problems to be solved by the invention
However, the above-mentioned prior art has not been able to sufficiently impart toughness and durability required for use in cutlery such as tableware and table knives (ナイフ). Therefore, in order to use paper for cutlery such as tableware and table knives, improvement of toughness and durability is still required.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide coated paper for tableware, which is excellent in toughness and durability and can be used as a paper tableware in place of a conventional plastic paper knife.
Means for solving the problems
The invention made to solve the above problems is a coated paper for tableware, which has a pair of surface layers and a plurality of intermediate layers disposed between the pair of surface layers, the surface layers and the intermediate layers having, as main components, needle bleached kraft pulp (needle left basked クラフトパルプ) and hardwood bleached kraft pulp (Wide maj basked クラフトパルプ), the surface layers having a mass ratio of the needle bleached kraft pulp to the hardwood bleached kraft pulp of 5/95 or more and 15/85 or less, the intermediate layers having a mass ratio of the needle bleached kraft pulp to the hardwood bleached kraft pulp of 30/70 or more and 40/60 or less, the surface layers having a surface coating layer containing a completely saponified polyvinyl alcohol on the surface.
The coated paper for tableware can increase the thickness of paper and improve the rigidity and durability by mixing and combining the softwood bleached kraft pulp and the hardwood bleached kraft pulp. Further, by setting the mass ratio of the softwood bleached kraft pulp to the hardwood bleached kraft pulp in the surface layer to 5/95 or more and 15/85 or less, a pair of surface layers can obtain high density and stiffness characteristics and have excellent strength because the hardwood bleached kraft pulp which is relatively stiff ( straight) and is easily densified is contained in a large amount. Further, the surface layer is highly effective in suppressing penetration of water or oil components from the target article such as food into the inside. On the other hand, when the mass ratio of the softwood bleached kraft pulp to the hardwood bleached kraft pulp in the intermediate layer is 30/70 or more and 40/60 or less, the intermediate layer has good flexibility because the intermediate layer contains a large amount of softwood bleached kraft pulp having high flexibility. The coated paper for tableware has a multilayer composite structure (multi-sample composite き and わせ structure) in which a pair of rigid surface layers having hard and brittle characteristics and a flexible intermediate layer are combined, and thus can suppress deformation and bending while ensuring elasticity, despite the relatively high density of the surface layers. Further, since the coated paper for tableware has a surface coating layer containing completely saponified polyvinyl alcohol on the surface of the surface layer, it is possible to impart good surface strength to the coated paper for tableware. Therefore, the coated paper for tableware is excellent in toughness and durability, and is suitable for paper tableware as a substitute for conventional resin disposable tableware.
The coating amount of the surface coating layer is preferably 1g/m 2 Above and 5g/m 2 The following. Thus, since the coating amount of the surface coating layer is in the above range, the coated paper for tableware can further improve toughness and durability.
The ratio of the total basis weight of the pair of surface layers to the total basis weight is preferably 25.0% or more and 35.0% or less. In the coated paper for tableware comprising a pair of surface layers having stiffness and an intermediate layer having flexibility, the property of being hard to bend can be imparted by setting the ratio of the total basis weight of the pair of surface layers within the above range.
The total number of the intermediate layers is preferably 4 or more. Since the total number of the intermediate layers is 4 or more, the toughness and durability of the coated paper for tableware can be further improved.
Another invention made to solve the above problems is paper tableware made of the coated paper for tableware. The paper tableware is made of the coated paper for tableware, and therefore, the paper tableware has excellent toughness and durability.
Effects of the invention
According to the present invention, there can be provided coated paper for tableware which is excellent in toughness and durability and which can be used as a substitute for paper tableware which is a conventional plastic tableware.
Detailed Description
The coated paper for tableware according to an embodiment of the present invention will be described in detail below.
Coated paper for tableware
The coated paper for tableware has a pair of surface layers and a plurality of intermediate layers disposed between the pair of surface layers. Further, the "tableware" in the present invention is a broad concept including kitchen utensils such as table knives and kitchen knives, and is not limited to dishes, bowls, chopsticks, cups, coasters, trays, stirring bars, spoons, forks, and the like. The coated paper for tableware is especially suitable for use in kitchen knife, kitchen knife and other cutting tools.
[ surface layer ]
The coated paper for tableware has a pair of surface layers. The surface layer has needle bleached kraft pulp and broad-leaved wood bleached kraft pulp as main components. The "main component" refers to a component contained at the maximum on a mass basis.
The mass ratio of the softwood bleached kraft pulp to the hardwood bleached kraft pulp in the surface layer is 5/95 or more and 15/85 or less. By setting the mass ratio of the softwood bleached kraft pulp to the hardwood bleached kraft pulp within the above range, the hardwood bleached kraft pulp which is relatively stiff and easily densified is contained in a large amount, and therefore, the surface layer can have high-density and stiff characteristics and excellent strength. Further, the surface layer has a high effect of suppressing penetration of water or oil components from the target article such as food into the inside. Further, by combining with the intermediate layer having flexibility, deformation and breakage can be suppressed while securing elasticity.
The coated paper for tableware can be used in combination of known various pulps as required for each layer thereofChemical pulp such as ECF (elementary Chlorine Free) pulp, TCF (Total Chlorine Free) pulp, unbleached Kraft Pulp (UKP), broadleaf unbleached Bai Niupi pulp (LUKP), needle unbleached Bai Niupi pulp (NUKP), broadleaf semi-bleached kraft pulp (LSBKP), needle semi-bleached kraft pulp (NSBKP), broadleaf sulfurous acid pulp, needle sulfurous acid pulp, or pulp produced chemically or mechanically from non-wood fibers such as Kenaf (Kenaf), hemp, reed, or the like. The coated paper for tableware is used for paper tableware and is in direct contact with target articles such as food. Therefore, other pulp used for the coated paper for tableware is preferably chemical pulp, and among them, ECF pulp, TCF pulp, unbleached Kraft Pulp (UKP) are more preferable. ECF pulp is prepared without using chlorine (Cl) 2 ) From chlorine dioxide (ClO) 2 ) Bleaching the manufactured chlorine-free bleached chemical pulp. TCF pulp is prepared without using chlorine (Cl) 2 ) A totally chlorine-free bleached chemical pulp manufactured by oxygen (O), hydrogen peroxide (P), ozone (Z) bleaching. That is, since the content of chlorine ions is a trace amount or 0, ECF pulp and TCF pulp have an advantage that the risk of generating organic chlorine compounds such as dioxin-based compounds is low even by low-temperature incineration, and as a result, the environmental burden can be reduced. In addition, the color of wood (ice cream stick, etc.) can be approximated by using unbleached kraft pulp, and reduction of environmental load, which is reduction of energy and CO, can be achieved by omitting the bleaching process 2 And (4) reduction.
The lower limit of the Canadian Standard Freeness (CSF) of the pulp used for the surface layer of the coated paper for tableware is preferably 410ml. When the CSF of the pulp used for the surface layer is less than 410ml, the coated paper for tableware may have a reduced rigidity. On the other hand, the upper limit of the CSF of the pulp for the surface layer is preferably 470ml. When the CSF exceeds 470ml, the adjustment of the orientation of the pulp fiber in the paper machine becomes difficult, so that the texture of the coated paper for tableware becomes poor, and further, the paper force may be low for use as a paper container. The coated paper for tableware can increase the thickness of paper and improve the rigidity by mixing and combining the softwood bleached kraft pulp and the hardwood bleached kraft pulp with high freeness. The Canadian Standard Freeness (CSF) is a value obtained by decomposing the pulp into decomposed pulp according to the pulp decomposition method of JIS-P8220-1 (2012) and measuring the decomposed pulp according to the canadian standard freeness test method of JIS-P8121-2 (2012).
[ intermediate layer ]
The coated paper has a plurality of intermediate layers disposed between the pair of surface layers. The middle layer comprises needle-wood bleached kraft pulp and broad-leaf wood bleached kraft pulp as main components. Further, the mass ratio of the softwood bleached kraft pulp to the hardwood bleached kraft pulp in the intermediate layer is 30/70 or more and 40/60 or less. When the mass ratio of the softwood bleached kraft pulp to the hardwood bleached kraft pulp in the intermediate layer is in the above range, the intermediate layer has good flexibility because the intermediate layer contains a large amount of softwood bleached kraft pulp having high flexibility. Therefore, the coated paper for tableware is excellent in toughness and durability because the soft intermediate layer is combined with the pair of hard surface layers having the above-described rigidity and a tendency to break easily.
The lower limit of Canadian Standard Freeness (CSF) of the pulp used for the middle layer of the coated paper for tableware is preferably 375ml. When the CSF is less than 375ml, the dewatering performance in the paper machine may be deteriorated, and the adjustment of the orientation of the pulp fibers may be difficult. On the other hand, the upper limit of the CSF of the pulp used for the intermediate layer is preferably 465ml. In the case where the CSF exceeds 465ml, there is less fibrosis, possibly resulting in a decrease in interlaminar strength. In addition, from the viewpoint of maintaining the Z-axis strength of the intermediate layer while securing the elastic force, the canadian standard freeness of the pulp for the intermediate layer is preferably smaller than the canadian standard freeness of the pulp for the pair of surface layers.
The total number of the intermediate layers is preferably 4 or more. Since the total number of the intermediate layers is 4 or more, the toughness and durability of the coated paper for tableware can be further improved. The total number of the intermediate layers is preferably 8 or less from the viewpoint of maintaining interlayer strength.
[ additives ]
The coated paper for tableware preferably contains a sizing agent (サイズ) and a paper strength agent as additives for papermaking in the surface layer and the intermediate layer.
(sizing agent)
In the surface layer of the coated paper for tableware, a sizing agent may be added to each layer in order to further suppress the penetration of water or oil components from the target articles such as food. Examples of the sizing agent include styrene sizing agents, alkyl Ketene Dimer (AKD), alkenyl Succinic Anhydride (ASA), neutral rosin sizing agents, modified rosin emulsion sizing agents, and the like. Among these, rosin sizing agents and modified rosin emulsion sizing agents are preferable.
The rosin sizing agent is a sizing agent currently known in the paper making field, and is not particularly limited. Examples of the rosin-based material include a rosin ester obtained by reacting a rosin such as gum rosin, wood rosin, tall oil rosin, or the like with a rosin modified with an α, β -unsaturated carboxylic acid such as fumaric acid, maleic acid, acrylic acid, or an anhydride thereof, and a polyhydric alcohol such as glycerin, trimethylolethane, trimethylolpropane, pentaerythritol, diglycerin, or the like. The rosin-based sizing agent of the present invention includes sizing agents obtained by emulsifying these components alone or in combination, and also includes sizing agents obtained by emulsifying these components alone and then mixing them. In addition, in order to further improve sizing development, the milk-liquefied sizing agent also comprises sizing agents added with various polymers.
The content of the sizing agent in the surface layer is preferably 0.5kg/t or more and 5.0kg/t or less in terms of solid content. The content of the sizing agent in the intermediate layer is preferably 2.0kg/t or more and 5.0kg/t or less in terms of solid content. Also, "kg/t" represents the mass (kg) of sizing agent per ton of pulp. By setting the content of the sizing agent within the above range, the water resistance can be improved.
(paper strength enhancer)
The paper strength agent sizing agent can be added to each layer of the coated paper for tableware. By adding the paper strength enhancer, various strengths suitable for use as paper tableware can be imparted to each layer.
As the paper strength-enhancing agent, various known resins such as polyacrylamide resin, polyamide resin, polyamine resin, acryl resin, melamine resin, urea resin, and polyamide epichlorohydrin resin can be used. Among these, amphoteric paper strength enhancers are also preferably used. Examples of the amphoteric polyacrylamide include a copolymer of acrylamide with the anionic monomer and the cationic monomer, a mannich reaction modified product of a copolymer of acrylamide with the anionic monomer, and a hofmann reaction decomposed product. According to the findings of the present inventors, amphoteric polyacrylamide is particularly preferable because amphoteric polyacrylamide has a self-fixing function, and the modified rosin emulsion sizing agent can be stably fixed without increasing the amount of cations even when added to improve the strength between papers.
The content of the paper strength agent in each layer is preferably 12kg/t or more and 20kg/t or less in terms of solid content. When the content of the paper strength enhancer is within the above range, various paper strengths such as interlaminar strength of the coated paper for tableware can be imparted. If the content of the paper strength enhancer is below the above range, the interlayer strength may be insufficient. On the other hand, if the content of the paper strength agent exceeds the above range, the improvement of the interlayer strength is almost delayed, and the productivity of the added paper strength agent is lowered, so that the inside of the paper machine is fouled and foamed, and the workability may be lowered.
(other additives)
The coated paper for tableware may contain other various papermaking additives within a range not impairing the intended effects of the present invention. Examples of other additives that can be added to the coated paper for tableware include known paper-making agents.
[ surface coating layer ]
The coated paper for tableware has a surface coating layer containing completely saponified polyvinyl alcohol on the surface of the surface layer. In order to suppress the penetration of water or oil components from target articles such as food into the inside and maintain the surface strength, it is necessary to form a relatively strong coating film on the surface of the surface layer in contact with the target articles such as food, and by providing the coated paper for tableware with the surface coating layer, the coated paper for tableware has good surface strength and a high effect of suppressing the penetration of water or oil components into the inside.
The amount of the completely saponified polyvinyl alcohol to be applied is preferably 0.5g/m from the viewpoint of imparting good surface strength 2 Above and 5.0g/m 2 The following.
The surface coating layer preferably contains a wax sizing agent. The wax-based sizing agent may be a paraffin-based sizing agent, a microcrystalline wax-based sizing agent, a carnauba wax-based sizing agent, or the like, and among these wax-based sizing agents, a paraffin-based sizing agent is preferably contained because good water repellency and water resistance can be imparted.
The amount of the wax sizing agent to be applied is preferably 0.1g/m from the viewpoint of improving water repellency and water resistance 2 Above and 0.5g/m 2 The following.
The surface coating layer preferably contains a surface sizing agent. Examples of the surface sizing agent include styrene-acrylic sizing agents, alkyl Ketene Dimers (AKD), alkenyl Succinic Anhydrides (ASA), neutral rosin sizing agents, and rosin sizing agents. In addition to these sizing agents, an acrylic sizing agent is also suitably used.
The amount of the surface sizing agent to be applied is preferably 0.2g/m from the viewpoint of suppressing the strength shortage due to moisture when used as tableware 2 Above and 1.0g/m 2 The following.
The surface coating layer may contain starch, polyacrylamide, etc. in addition to polyvinyl alcohol, paraffin wax, and a surface sizing agent. In addition, the surface coating layer may further comprise additives such as are known for papermaking applications.
The surface coating layer is presumed to include: (1) The fibers at the surface of the surface layer are impregnated with an aqueous composition; (2) A form in which a resin layer is formed on the surface of the surface layer by the aqueous composition; (3) The surface of the surface layer fiber is covered by the aqueous composition; (4) combinations of the above, and the like. Further, a part of the composition for a surface coating layer may be impregnated.
The lower limit of the amount of the surface coating layer to be applied is preferably 1.0g/m from the viewpoint of improving the surface strength 2 More preferably 2.0g/m 2 . To suppress the decrease of the texture of paper and the blocking during the processingFrom the viewpoint of occurrence of stain, the upper limit of the coating amount of the surface coating layer is preferably 5.0g/m 2 More preferably 4.0g/m 2 。
[ physical Properties of coated paper for tableware ]
(basis weight)
The basis weight was measured in accordance with JIS P8124 (2011). The basis weight of each layer of the coated paper for tableware is not necessarily uniform, and the basis weight of the surface layer and the middle layer is not particularly limited, but the basis weight of the surface layer 1 is preferably 90.0g/m 2 Above and 300.0g/m 2 The following. Further, the basis weight of the whole intermediate layer is preferably 450.0g/m 2 925.0g/m 2 The following.
From the viewpoint of obtaining sufficient rigidity, the lower limit of the overall basis weight of the coated paper for tableware is preferably 700.0g/m 2 More preferably 750.0g/m 2 . The upper limit of the basis weight of the coated paper for tableware is preferably 1000.0g/m 2 More preferably 900.0g/m 2 . In said basis weight exceeding 1000.0g/m 2 In the case of (2), although sufficient rigidity is easily obtained, wrinkles may easily occur due to passing through a paper roll during papermaking.
The ratio of the total basis weight of the pair of surface layers to the basis weight of the whole coated paper for tableware is preferably 25.0% to 35.0%. In the coated paper for tableware comprising a pair of surface layers having stiffness and an intermediate layer having flexibility, the ratio of the total basis weight of the pair of surface layers is in the above range, and the characteristic of being hard to bend can be provided.
(paper thickness)
The sheet thickness was measured in accordance with "test method for paper and board-thickness and density" described in JIS-P8118 (2014). The coated paper for tableware preferably has a paper thickness of 950 to 1300 μm. Since the paper thickness of the coated paper for tableware is in the above range, peeling of the coated paper layer for tableware can be suppressed.
(Density)
The density of the coated paper for tableware is preferably 0.73g/cm 3 Above and 0.88g/cm 3 The following. Due to the fact thatThe coated paper for tableware has a density within the above range, is excellent in rigidity, and can be reduced in basis weight and weight.
(moisture)
The water content of the coated paper for tableware, measured in accordance with JIS P8127 (2010), is preferably 9.0% or more and 11.0% or less. Since the water content of the coated paper for tableware is in the above range, the flexibility is improved, and the operability of the folding machine in the case of producing tableware by using the coated paper for tableware and the effect of suppressing the breakage of the folded portion can be improved.
(Ash)
The ash content was measured in accordance with JIS-P8251 (2003). The ash content of the coated paper for tableware is preferably 0.1% to 10.0%. Since the ash content of the coated paper for tableware is in the above range, the curl can be adjusted to be flat, and the decrease in the interlayer strength can be suppressed.
(surface Strength)
The surface strength was measured based on "surface strength test method" in JAPAN TAPPI paper and pulp test method No. 1m-72. The lower limit of the surface strength of the coated paper for tableware is preferably 10A. Since the surface strength of the coated paper for tableware is in the above range, the surface layer can be peeled off, and the scratch resistance in the stage of transportation and processing can be improved.
(Cobb sizing degree (コ ブ サイズ degree))
The Cobb sizing degree was measured using distilled water at 23 ℃ in accordance with JIS-P8140 (1998). The coated paper for tableware preferably has an upper limit of Cobb sizing degree of 50g/m 2 . When the Cobb sizing degree of the coated paper for tableware is not less than the upper limit, generation of waviness and wrinkles due to moisture absorption of the coated paper for tableware may be caused.
(Z-axis Strength)
Regarding the Z-axis strength of the water and oil resistant paper, the Z-axis strength measured based on JAPAN TAPPI paper and the pulp test method No.18-1 is preferably 380kN/m 2 The above. The Z-axis strength can suppress the occurrence of delamination and wrinkles in the molding of tableware.
The coated paper for tableware can be used for paper tableware which has excellent toughness and durability and can replace the conventional plastic tableware.
[ method for producing coated paper for tableware ]
The method for producing the coated paper for tableware is not particularly limited, and for example, it can be produced by the following steps using a known multilayer papermaking machine.
(1) To a slurry obtained by dispersing pulp fibers in water, additives corresponding to the respective paper layers are added and mixed as necessary to prepare a paper material for each paper layer.
(2) Then, using these raw material pulps, the surface layer, the single-layer or multi-layer intermediate layer, and the surface layer were subjected to paper making by a paper machine in a neutral zone so that the pH of the coated paper for tableware was 6 or more and 8 or less.
The paper making method is not particularly limited, and a known paper machine, that is, a paper machine such as a fourdrinier wire, a cylinder, a mixing machine, or a gap former, is used to make a multilayer paper having 3 or more layers. In the papermaking process, a coating apparatus such as a size press (サイズ プ レ ス), a metering size press, or a gate roll coater is used to apply a coating liquid to the surface of the surface layer to form a surface coating layer.
(3) Subsequently, the pressing was performed by a pressing roller to remove water.
(4) Subsequently, the resultant was dried in a drying cylinder.
After drying, the smoothing treatment can be performed by using a calender apparatus such as a roll calender (ニップキャレンダー), a super calender (スーパーキャレンダー), a mechanical calender (マシンキャレンダー), and a soft calender (ソフトキャレンダー). The coated paper for tableware is imparted with high glossiness by the smoothing treatment, and can be suitably used for paper tableware with a high-grade feeling.
(5) And finally winding the paper on a scroll to obtain the coated paper for tableware.
< paper tableware >
The paper tableware is composed of the coated paper for tableware. The paper tableware is made of the coated paper for tableware, and therefore has excellent toughness and durability.
The coated paper for tableware can be used for paper tableware which has excellent toughness and durability and can replace the conventional plastic tableware.
< other embodiment >
The present invention is not limited to the above-described embodiments, and various changes and modifications other than those described above can be made.
Examples
The present invention will be described in further detail with reference to the following examples, but the present invention is not limited to the following examples.
The methods for measuring the physical property values of the examples and comparative examples are as follows.
[ freeness (mL) ]
The resulting coated paper for tableware was decomposed into decomposed pulp according to the pulp decomposition method of JIS-P8220-1 (2012), and the decomposed pulp was measured according to the canadian standard freeness test method of JIS-P8121-2 (2012).
[ basis weight (g/m) 2 )]
Measured in accordance with the "paper and board-basis weight measuring method" described in JIS-P8142 (1998).
[ thickness of paper (. Mu.m) ]
The measurement was carried out in accordance with "test method for paper and board thickness and density" described in JIS-P8118 (2014).
[ Density (g/cm) 3 )]
The measurement was carried out in accordance with "test method for paper and board thickness and density" described in JIS-P8118 (2014).
[ Water ] A
Measured according to JIS P8127 (2010).
[ Ash content ]
Measured according to JIS-P8251 (2003)
[ surface Strength ]
Measured based on the surface strength test of the wax of JAPAN TAPPI No. 1.
[ Cobb sizing degree ]
Measured according to JIS-P8140 (1998).
[ Z-axis Strength ]
Measured based on JAPAN TAPPI paper and pulp test method No. 18-1.
[ bending Strength ]
The flexural strength was measured by a digital force gauge (manufactured by IMADA), and the test conditions were as follows. The coated paper for tableware was fixed to a three-point bending jig, and a load cell was lowered. At this time, the load is set as the bending strength (N). The test was carried out under a test environment of 26 ℃ and 70% humidity.
[ example 1]
(1) The compounding ratio of the surface layer and the intermediate layer is as follows.
(surface layer)
To 100 parts of pulp slurry with a freeness of 440mL and a NBKP of 10 LBKP were added the following raw materials:
modified rosin emulsion-based sizing agent (star PMC corporation "AL 1344"):
the solid content was 2.5 kg/ton of pulp
Acrylamide paper strength enhancer (Ha Lima chemical group (ハリマ chemical Co., ltd.) "Harmide RB-28")
The solid content was 16.0 kg/ton pulp.
(intermediate layer)
To 100 parts of a pulp slurry with a freeness of 440mL, NBKP: LBKP of 35, the following raw materials were added:
modified rosin emulsion-based sizing agent (star PMC, AL1344 "):
solid content 3.5 kg/ton pulp
Acrylamide paper strength enhancer (Ha Lima Harmid RB-28, a synthetic group)
The solid content was 16.0 kg/ton pulp.
(2) The pulp slurry was papermaking-combined into a 7-layer structure of a surface layer, 5 intermediate layers and a surface layer by a wire part using a cylinder multi-layer paper machine. The basis weight of each layer is 125g/m of the surface layer 2 Intermediate layer 626.5g/m 2 Back side layer 125g/m 2 Total basis weight 880.0g/m 2 。
(3) The following coating amounts of polyvinyl alcohol and paraffin wax3.5g/m 2 The coating liquid was applied to the surface of the surface layer by rolling to form a surface coating layer, to obtain coated paper for tableware of example 1:
polyvinyl alcohol (manufactured by Nippon synthetic chemical Co., ltd. "ゴーセノール N300"): 2.7g/m 2
Paraffin (Ha Lima into the conglomerate "ハリコート RK"): 0.2g/m 2
Surface sizing agent for styrene-methacrylic acid copolymer resin (mass average molecular weight 9000, melting point 100 ℃, manufactured by recent chemical industries "ケイコート SA20", SP value 10.0): 0.6g/m 2 。
Example 2 to example 12 and comparative example 1 to comparative example 6
Coated tableware papers of examples 2 to 12 and comparative examples 1 to 6 were produced in the same manner as in example 1 except that the kinds, contents and physical property values of the raw materials were as shown in tables 1 and 2. Comparative example 6 used 80% partially saponified polyvinyl alcohol. Furthermore, "-" in the following Table 1 indicates that this component was not used.
TABLE 1
TABLE 2
[ evaluation ]
The evaluation results of the coated tableware papers are shown in Table 3.
[ Table 3]
As shown in Table 3, examples 1 to 12 of the coated paper for tableware showed good results in all of surface strength, cobb sizing degree, Z-axis strength and flexural strength.
On the other hand, the strength of any of comparative examples 1 to 6, in which the mass ratio of the softwood bleached kraft pulp to the hardwood bleached kraft pulp in the surface layer was less than 5/95 or more than 15/85, the mass ratio of the softwood bleached kraft pulp to the hardwood bleached kraft pulp in the intermediate layer was less than 30/70 or more than 40/60, or the surface layer contained partially saponified polyvinyl alcohol, was inferior.
Industrial applicability
The coated paper for tableware of the present invention can be suitably used for paper tableware.
Claims (11)
1. A coated paper for tableware, comprising a pair of surface layers and a plurality of intermediate layers disposed between the pair of surface layers,
the surface layer and the middle layer take needle-wood bleached kraft pulp and broad-leaf-wood bleached kraft pulp as main components,
the mass ratio of the softwood bleached kraft pulp to the hardwood bleached kraft pulp in the surface layer is 5/95 or more and 15/85 or less,
the mass ratio of the softwood bleached kraft pulp to the hardwood bleached kraft pulp in the intermediate layer is 30/70 or more and 40/60 or less,
the surface layer has a surface coating layer containing completely saponified polyvinyl alcohol on the surface,
the coated paper for tableware is used for a stirring rod, a spoon, a fork, a table knife or a kitchen knife,
wherein the basis weight of the coated paper for tableware is 700g/m 2 Above and 1000g/m 2 The following.
2. The coated paper for tableware according to claim 1 wherein the coated paper for tableware has a Z-axis strength of 380kN/m 2 The above.
3. The coated paper for tableware according to claim 1 wherein the surface coating layer further contains a wax sizing agent.
4. The coated paper for tableware according to claim 1 wherein the coating amount of the surface coating layer is 1.0g/m 2 Above and 5.0g/m 2 The following.
5. The coated paper for tableware according to claim 1 wherein a ratio of the total basis weight of the pair of surface layers to the total basis weight is 25.0% or more and 35.0% or less.
6. The coated paper for tableware according to claim 1 wherein the total number of the intermediate layers is 4 or more.
7. The coated paper for tableware according to claim 2 wherein the total number of the intermediate layers is 4 or more.
8. The coated paper for tableware according to claim 3 wherein the total number of the intermediate layers is 4 or more.
9. The coated paper for tableware according to claim 4 wherein the total number of the intermediate layers is 4 or more.
10. The coated paper for tableware according to claim 5 wherein the total number of the intermediate layers is 4 or more.
11. A paper stirring rod, spoon, fork, knife, or kitchen knife composed of the coated paper for tableware of any one of claims 1 to 10.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018228485A JP6754417B2 (en) | 2018-12-05 | 2018-12-05 | Coated paper for tableware |
| JP2018-228485 | 2018-12-05 | ||
| PCT/JP2019/047281 WO2020116465A1 (en) | 2018-12-05 | 2019-12-03 | Coating paper for tableware |
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| Publication Number | Publication Date |
|---|---|
| CN113195829A CN113195829A (en) | 2021-07-30 |
| CN113195829B true CN113195829B (en) | 2023-01-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201980078217.5A Active CN113195829B (en) | 2018-12-05 | 2019-12-03 | Coated paper for tableware |
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|---|---|
| JP (1) | JP6754417B2 (en) |
| KR (1) | KR20210097136A (en) |
| CN (1) | CN113195829B (en) |
| WO (1) | WO2020116465A1 (en) |
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| JP6911088B2 (en) * | 2019-11-15 | 2021-07-28 | 大王製紙株式会社 | Multilayer paper and its manufacturing method |
| JP2023114287A (en) * | 2022-02-04 | 2023-08-17 | 大王製紙株式会社 | cutlery |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1534137A (en) * | 2003-03-28 | 2004-10-06 | 王子制纸株式会社 | Coating paper for printing |
| CN103074822A (en) * | 2012-12-28 | 2013-05-01 | 珠海华丰纸业有限公司 | Special paper for external standard of cup bowl and manufacturing technology thereof |
| CN104080607A (en) * | 2011-11-10 | 2014-10-01 | 日本制纸株式会社 | Barrier paper packaging material |
| JP2018031092A (en) * | 2016-08-24 | 2018-03-01 | 大王製紙株式会社 | Water-resistant oil-resistant paper, and paper-made container |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003079505A (en) | 2001-06-28 | 2003-03-18 | Sanyo:Kk | Paper shaft, and stick and spoon for agitating |
| JP4355283B2 (en) * | 2004-12-17 | 2009-10-28 | 大王製紙株式会社 | Mixing stick and spoon made of tableware paper |
| JP4302124B2 (en) * | 2006-06-29 | 2009-07-22 | 大王製紙株式会社 | Multi-layer paperboard and paper containers |
| JP5379670B2 (en) * | 2009-12-22 | 2013-12-25 | 北越紀州製紙株式会社 | Multi-layer oil-resistant paperboard, method for producing the same, and oil-resistant paper container using the same |
| JP2012219381A (en) * | 2011-04-04 | 2012-11-12 | Oji Paper Co Ltd | Paper cup base paper |
| JP5957586B2 (en) * | 2015-09-14 | 2016-07-27 | 大王製紙株式会社 | Press pocket type carrier tape |
| JP6822370B2 (en) * | 2017-10-04 | 2021-01-27 | 王子ホールディングス株式会社 | Base paper for paper cups and paper cups |
-
2018
- 2018-12-05 JP JP2018228485A patent/JP6754417B2/en active Active
-
2019
- 2019-12-03 WO PCT/JP2019/047281 patent/WO2020116465A1/en active Application Filing
- 2019-12-03 KR KR1020217017185A patent/KR20210097136A/en unknown
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1534137A (en) * | 2003-03-28 | 2004-10-06 | 王子制纸株式会社 | Coating paper for printing |
| CN104080607A (en) * | 2011-11-10 | 2014-10-01 | 日本制纸株式会社 | Barrier paper packaging material |
| CN103074822A (en) * | 2012-12-28 | 2013-05-01 | 珠海华丰纸业有限公司 | Special paper for external standard of cup bowl and manufacturing technology thereof |
| JP2018031092A (en) * | 2016-08-24 | 2018-03-01 | 大王製紙株式会社 | Water-resistant oil-resistant paper, and paper-made container |
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| JP6754417B2 (en) | 2020-09-09 |
| JP2020090739A (en) | 2020-06-11 |
| CN113195829A (en) | 2021-07-30 |
| KR20210097136A (en) | 2021-08-06 |
| WO2020116465A1 (en) | 2020-06-11 |
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