JP2007138318A - Oil-proof paper and container using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive oil-proof paper Ts having a high oil proofness in ruled line part, reducing cost by reducing the numbers of coating units by disposing a flexible layer R2 on a paper and then coating an oil proof layer R1 on the flexible layer in papermaking stage, and to provide a container produced by using the same. <P>SOLUTION: The oil-proof paper being a sheet paper made by treating a fiber structure with a softener, wherein a water soluble resin is coated as the oil proofing layer R1 on the layer R2 treated with the softener. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an oil-resistant paper excellent in oil resistance and excellent in flexibility and a container made using the oil-resistant paper.

  Conventionally, oil-resistant paper is often used for fried foods such as fast food in packaging containers, department stores, convenience stores, and other take-out food packaging containers.

    Oil-resistant paper can be broadly divided into two types: fluorine resin and non-fluorine resin. Fluorine-based oil-resistant paper is an oil-resistant mechanism in which surface tension is reduced by a fluorine treatment agent arranged on the surface layer. Many non-fluorine-based oil-resistant papers exhibit oil resistance by creating a resin film on the surface. is doing. In comparison, the non-fluorinated oil-resistant paper has a problem that the oil resistance is remarkably lowered at the folded portion. This is due to the fact that the oil-resistant layer on the surface layer is cracked at the bent portion and the oil resistance tends to be lost.

Patent Document 1 is an example of prior art document information related to the invention of the present application.
Japanese Patent Application No. Hei 4-236377 As this prior art, a core-shell type acrylic emulsion is applied several times to one side of paper, and a large number of acrylic resin layers are stacked to apply a predetermined thickness. A film is formed. The solution is to prevent deterioration of the oil resistance of the ruled line portion as much as possible by applying the coating many times.

  In contrast to the prior art, conventional non-fluorinated oil-resistant paper has to be applied multiple times, so there is a limit on the number of coating units. If there is only one coating unit, it is processed multiple times. There was a problem that had to be done. In general, the upper limit of the solid content of the water-soluble resin is less than about 50% to several percent, and a considerable amount of heat is required for drying in order to eliminate moisture as a solvent. Damage to paper fibers also increases. Specifically, a wakame-shaped curl is likely to occur due to a rapid change in moisture content.

  The present invention has been made in consideration of the above-mentioned problems. Specifically, the number of coating units is determined by arranging a flexible layer on the paper at the papermaking stage and coating the oil-resistant layer thereon. The purpose is to provide a low-cost oil-resistant paper having high oil resistance even in the ruled line portion.

  The invention of claim 1 is a sheet-like paper in which the fiber structure is processed with a softening agent, and is coated with a water-soluble resin as an oil-resistant layer on the layer processed with the softening agent. The oil-resistant paper is characterized by that.

The invention according to claim 2 is the paper according to claim 1, wherein the paper is 200 g / m ² or more of multi-layered paper, and the outermost layer on one side is treated with a softening agent, and on the treated layer The oil-resistant paper is characterized in that it is coated with an oil-resistant agent in which a water-soluble resin such as an acrylic resin, a polyester resin, or an SBR latex is used alone or mixed.

The invention of claim 3 is the paper of claim 1, wherein the paper is a single-layered paper of less than 200 g / m ² , and all layers are treated with a softening agent, on the treated layer. The oil-resistant paper is characterized by being coated with an oil-resistant agent in which polyvinyl alcohol resin and starch-based resin are used alone or mixed.

A fourth aspect of the present invention is a container made using the oil-resistant paper according to any one of the first to third aspects.
(Function)
The invention corresponding to claim 1 can provide an oil resistant paper excellent in flexibility by applying an oil resistant agent to paper having a fiber layer treated with a softening agent.

  In the invention corresponding to claim 2, the basis weight in which the flexible layer is arranged in the outermost layer and the oil-resistant layer is arranged in the multilayered paper, and a ruled line having a step of about 50 μ to 200 μ is attached to form a box shape. Since the paper has a basis weight of 200 g / m 2 or more, it is possible to apply a certain amount of resin as a resin, and as a water-soluble resin having a certain degree of strength and flexibility, acrylic, polyester, and SBR latex An oil-resistant paper excellent in flexibility can be provided under the definition of an oil-resistant agent prepared by mixing or using a single resin.

  In the invention corresponding to claim 3, since the fiber is thin in the single-layered paper, the softener is dispersed in all layers when it is blended in the papermaking chemical, and the softener is dispersed from the surface layer by a size press or the like. Even if given, it is easy to disperse in all layers. Since this basis weight oil-resistant paper is often simply folded to form ruled lines, as a more suitable material, an oil-resistant layer is provided with an oil-resistant agent prepared by combining polyvinyl alcohol resin or starch-based resin as a single substance or as a mixture. Under the regulations, oil-resistant paper having excellent flexibility can be provided.

  Hereinafter, drawings are attached to each embodiment of the present invention.

(First embodiment)
FIG. 1 is a schematic diagram showing a cross-sectional configuration of a fiber structure according to the first embodiment of the present invention.
This fiber structure (FIG. 1) has a soft layer in which a softening agent is blended in a fiber layer, and an oil-resistant layer is provided thereon by coating.

  In this embodiment, as described in the description of the actions of claims 2 and 3, in the case where the fiber structure is thin single-layer paper, a flexible layer is formed in the entire area of the fiber structure. In the case of a fiber structure (illustrated in FIG. 2), in the case of multilayer paper, a flexible layer is formed on the outermost layer, and an oil-resistant layer is formed thereon.

Here, the fiber structure substrate (T) is a chemical pulp such as hardwood bleached kraft pulp, softwood bleached kraft pulp, GP (ground pull: groundwood pulp), RGP (refiner ground pulp: refiner groundwood pulp), TMP (thermomechanical pulp). : Thermo-mechanical pulp), or base paper made from these. The definition of the base paper is as follows: high-quality medium-quality paper made by a known long-mesh multi-cylinder paper machine, long-mesh Yankee-type paper machine, circular net paper machine, etc., acidic paper such as glossy paper and kraft paper, Includes paper and alkaline paper. These base papers may contain paper-making auxiliary chemicals such as a paper strength enhancer, a sizing agent, a filler, and a yield improver.

  Specifically, the paper means thin paper such as fine paper, imitation paper, and kraft paper, paperboard, cardboard, non-woven fabric, and a fiber structure having a planar shape. The basis weight limits the type of oil proofing agent.

  The softener used in the soft layer includes a surfactant, a polyethylene wax emulsion, a reactive softener (which reacts strongly with cellulose and orients aliphatic hydrocarbons regularly around the fiber), Silicone compounds such as silicon polyol compounds can be used. For example, glycerin, polyethylene glycol, urea, paraffin emulsion, quaternary ammonium salt, softener containing di long chain alkyl type quaternary ammonium salt, di long chain alkyl type quaternary ammonium salt And a softener containing glycerin and water or an aliphatic alcohol having 4 or less carbon atoms, a softener containing lanolin and a lanolin derivative, a softener containing urethane alcohol or a quaternized product thereof, and a softener containing a cationic oligomer Agents, softeners containing polyamide derivatives, pyrrolidone carboxylic acid or salts thereof (JP-A-7-189170) and the like can also be used. In combination with these, polyether polyols can also be used in combination. For example, polyether polyols such as ethylene oxide, propylene oxide, butylene oxide or the like, or copolymerized or polyadded, ethylene glycol, diethylene glycol, butanediol, propylene Examples thereof include polyether polyols in which the above-described alkylene oxide is polyadded to glycols such as glycol and hexanediol, triols such as trimethylolpropane and pentaerythritol, and tetraols.

  For the oil-resistant layer, an acrylic aqueous emulsion, polyester aqueous emulsion, SBR latex, polyvinyl alcohol resin, and starch resin can be used. These can be used alone or in combination, but the compatibility of the combination is better in the acrylic aqueous emulsion, polyester aqueous emulsion, and SBR latex groups, and in the polyvinyl alcohol resin and starch resin groups. It is.

  As the acrylic resin emulsion, various emulsions such as copolymer emulsions such as acrylic polymers and acrylic-styrene copolymers and self-crosslinking acrylic copolymer emulsions can be used. Specifically, styrene and styrene derivatives can be used. Acrylic acid (methacrylic acid) and acrylic acid esters such as methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, and methacrylates such as methyl methacrylate, ethyl methacrylate, butyl methacrylate, etc. A polymerized acrylic copolymer.

As the polyester-based resin emulsion, a polyester-based resin modified with a chain hydrocarbon having a paint solid content in the range of 10% to 60% and having 8 to 20 carbon atoms as a hydrophobic group is preferably used. By adding hydrophobic groups (lipophilic groups) to improve the water resistance in the case of coating, and by modifying the resin with hydrophilic groups to disperse water in a solvent, the solution (water dispersion) Is a stable dispersion. Because it is a polyester resin modified with a chain hydrocarbon as a hydrophobic group, the structure of the chain hydrocarbon is similar to the hydrocarbon group of the oil, and from this structure the water and oil do not wet each other Water resistance can be imparted. When this is coated and dried, it becomes a film on the surface layer of the paper, thereby expressing high oil resistance.
When the number of carbon atoms in the above-mentioned hydrocarbons is arranged regularly and vertically on the fiber surface, the hydrophobicity is improved, and the arranged structure has the effect that highly viscous oil such as oil enters the fiber surface and is difficult to mix. In order to achieve expression, the number of carbon atoms is desirably 8 or more and 20 or less. More desirably, a value of about 12 to 18 is good, but there is a limit from the viewpoint of production yield to prepare the number of hydrocarbons in the resin production. The hydrocarbon may be saturated or unsaturated, but is more stable when saturated.
The SBR latex resin may be a modified latex obtained by copolymerizing (carboxy-modified) a monomer having a carboxyl group (—COOH).

Polyvinyl alcohol resin has many hydroxyl groups and high oil resistance, but water resistance is relatively weak. Therefore, the saponification degree needs to be 94.5% or more, preferably 98% or more. If the degree of saponification is high, the water resistance is high regardless of the presence or absence of cross-linking, but there is a tendency that the cross-linked gel is easily formed. For this reason, what is necessary is just to determine a saponification degree suitably with an actual production state.

  Polyvinyl alcohol resin has a low molecular weight distribution and the amount of elution with water increases, making it difficult to use from a hygienic point of view, particularly in the food field, at a temperature of 4% / at 20 ° C. , 7 (mPa · s) or higher. The polyvinyl alcohol resin may be a modified polyvinyl alcohol resin.

  As the starch, starch, modified starch (oxidized starch, starch derivative, etc.) and the like can be used. For example, oxidized starch, cationized starch, phosphate esterified starch, acetylated starch and the like can be used.

  For starch and polyvinyl alcohol resins, they may be used in combination with a crosslinking agent. The crosslinking agent crosslinks a functional group to improve oil resistance and water resistance, and a general one that reacts with a hydroxyl group is used. it can. However, when a package using a crosslinking agent is used for food applications, the crosslinking agent is also required to be hygienic. For this reason, it is necessary to determine a crosslinking agent in consideration of the use and performance.

  As the group of the crosslinking agent, those having a carboxyl group, an aldehyde group, a hydroxyl group, a phenolic hydroxyl group, an epoxy group, a metal salt, an isocyanate group, an N-methylol group, borax and the like can be used. More specifically, any one or a plurality of isocyanate resins, aminoaldehyde resins, glyoxal resins, epoxy resins, carbodiimide resins, inorganic metal salts, phenol resins, and melamine resins can be used.

  Among each crosslinking agent, a crosslinking agent comprising an inorganic metal salt is most preferable from the viewpoint of ease of handling and hygiene, and for example, ammonium zirconium carbonate, zinc sulfate, satin white or borax can be applied. Yes.

  As the aminoaldehyde-based crosslinking agent, urea / formaldehyde resin, melamine formaldehyde resin, polyamide / polyurea resin, polyamide / epichlorohydrin and the like can be preferably used.

  Examples of the glyoxal-based crosslinking agent include glyoxal, urea / glyoxal resin, and dialdehyde starch.

  Examples of the epoxy-based crosslinking agent include polyamide / epoxy resin.

As the carbodiimide-based crosslinking agent, a monocarbodiimide compound or a polycarbodiimide compound can be used as shown below. Here, examples of the monocarbodiimide compound include dicyclohexylcarbodiimide, diisopropylcarbodiimide, dimethylcarbodiimide, diisobutylcarbodiimide, dioctylcarbodiimide, t-butylisopropylcarbodiimide, dodecylisopropylcarbodiimide, diphenylcarbodiimide, di-tolylcarbodiimide, and dip-tolylcarbodiimide. , Cyanamide, di-t-butylcarbodiimide, 1,3-bis (trimethylsilyl) carbodiimide, di-β-naphthylcarbodiimide, benzylisopropylcarbodiimide, and the like can be used. Of the monocarbodiimide compounds, dicyclohexylcarbodiimide and diisopropylcarbodiimide are preferable from the viewpoint of being easily available industrially. On the other hand, the polycarbodiimide compound is prepared by a known method described in JP-A-59-187029, for example, a mono, di, triisocyanate compound in a non-reactive organic solvent, for example, 3-methyl- It is produced by converting an isocyanate group to a carbodiimide group by heating in the presence of 1-phenyl-2-phosphorate oxide and decarboxylation. The above carbodiimide compounds can be used alone or in combination of two or more.

  Examples of isocyanate-based crosslinking agents include aromatic diisocyanates such as phenylene diisocyanate (PDI), tolylene diisocyanate (TDI), naphthalene diisocyanate (NDI), 4,4 ′ diisocyanate diphenylmethane (MDI), and xylylene diisocyanate (XDI). Aromatic aliphatic diisocyanates, hydrogenated TDI, hydrogenated XDI, hydrogenated MDI, hexamethylene diisocyanate (HMDI), isophorone diisocyanate (IPDI), and other aliphatic or alicyclic diisocyanates and polyol adducts that are derivatives thereof, In addition to trifunctional isocyanates such as burettes and trimers, trifunctional or higher functional polyisocyanates, lysine triisocyanate (LTI), various oligomers and polymers containing isocyanates There can be used.

  The addition amount of the crosslinking agent may be a few percent to several percent (0.1 to 3%) of comma based on the solid content of the main agent, but the number of groups to react, the reaction rate, etc. Because of this, it cannot be said in general.

(Amount of application)
In the case of an acrylic, polyester, or SBR latex water-soluble resin, which is a water-soluble resin having a solid content of 20% empty to 40%, the coating amount ranges from 1 to ²⁰ g / m ^{2 in} dry coating amount. In the case of a polyvinyl alcohol resin or starch resin having a solid content of several to 10%, the dry coating amount is preferably in the range of 0.5 to 6 g / m ² . The lower limit depends on the required performance, and the upper limit may be set depending on the capacity of the drying furnace and the manufacturing cost.

(Coating method)
Any of coating devices such as a rod bar coater, a gravure coater, a roll coater, a bar coater, a blade coater, an air knife coater, and a curtain coater can be used for applying an oil resistant agent to paper.

(Oil-proofing agent ... drying temperature)
The drying temperature is not particularly limited, but it is sufficient to dry at 70 to 150 ° C. in order to fly water of the water-soluble resin. It is desirable to use it because the drying efficiency is maximized by the combined use of hot air.

(Mode of use)
The usage pattern in the multi-layered oil-resistant paper having a basis weight of 200 g / m ² or more is often used as a packaging container such as a box shape or a boat-shaped tray shape. In the present invention, imparting flexibility to the bent portion (ruled line portion) when taking a form such as a box using an oil-resistant paper having a basis weight of 200 g / m ² or more (does not cause film loss). Assumed. The ruled line contained in a carton used for a general confectionery box has a narrow width (0.7 mm to 1.0 mm) and a high ruled line height (50 to 250 μm).

The usage form in the oil-resistant paper of single-layer paper having a basis weight of less than 200 g / m ² is often used as a sheet or a package such as a bag. The sheet-like material is cut to a certain size, placed on a plate, etc., and is used when cooking with an oven or the like on top of food. And as package bodies, such as a bag shape, it can be used in the state which accommodated oily foods, such as fried chicken. Oil-resistant paper having a basis weight of less than 200 g / m ² is often used mainly in the form of a bag, and the ruled lines are often simply folded.

Examples The water- and oil-resistant paper according to the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. The indications “%” and “parts” represent “% by weight” and “parts by weight”, respectively. The tests and evaluation methods used in the examples are as follows.

(Test method)
In order to evaluate the oil resistance of the plane part and the ruled line part, in accordance with the provisions of oil resistance (kit method) TAPPIUM-557, one drop of a test solution having a different mixing ratio of castor oil, toluol, and n-hexane is dropped on the paper surface of the sample. After 15 seconds, wipe off the test solution dripped with tissue paper, and if a clear black spot is observed even if there is no stain due to the penetration of the test solution, that is, the oil soaks into the wet part, it will be rejected. For the maximum liquid number that passed, the average value of 5 points was expressed as a kit index. TAPPIUM-557 has a maximum of 12 grades, but for oil resistance higher than this, a method of measuring by increasing the amount of n-hexane by further reducing the ratio of toluol has been proposed. What was not impregnated with 100% of the kit solution was measured based on the revised method for grade 16. This test method is originally a reagent for inspecting the surface tension, but in this patent, it is used and inspected in the sense of a pinhole check (check for cracks).

  Hereinafter, each example will be described.

[Example 1]
(sample)
A paper having the following flexible layer formed was made into a base paper base material.
[Flexible layer] The following softener is added to the raw material of one layer on one side (pulp raw material in a slurry state).
Softener ... Ethylene glycol monoisostearate (5% added to 100 parts of raw pulp)
Surfactant ... Cationic surfactant Disper TL (Meisei Chemical)
(0.3% added to 100 parts raw pulp)
[Papermaking] Manufactured from various pulps by a normal papermaking process.
[Layer structure] Ivory base paper of 1 layer structure [basis weight] 100 g / m ²
[Oil Resistant Layer] (Main Agent) A saponified polyvinyl alcohol resin was used for the paper on which the flexible layer was formed, and the fiber structure substrate (T) was coated on the front and back surfaces by a gravure printing machine. A product (Kuraray PVA-117) having a saponification degree of 98 to 99 mol% and a viscosity (4%, 20 ° C.) of 25 to 31 mPa · s was prepared to a solid content of 7% and used. (Crosslinking) As a crosslinking agent, 0.6% of ammonium zirconium carbonate, which is an inorganic crosslinking agent, was added to the polyvinyl alcohol resin to prepare a mixed resin. (Coating amount) The dry coating amount was 3 g / m ² · coated as a single-side oil-resistant layer.

[Shape and Evaluation] A simple creased sachet was made and the oil resistance of the crease portion was evaluated.
Evaluation)
-Planar oil resistance (room temperature oil resistance) Castor oil (KIT1) and several drops of KIT12 were dropped and cleared. (Diameter oil resistance) When castor oil was applied to the surface of the fiber structure with a brush, it penetrated after one week. The amount of penetration was as small as the tip of the needle.
-Ruled line (crease) oil resistance (room temperature oil resistance) Castor oil (KIT1) and several drops of KIT5 were cleared when dropped.
(Oil resistance at diameter) When castor oil was applied to the surface of the fiber structure with a brush, it penetrated after 4 days. The amount of penetration was as small as the tip of the needle.
・ Real packaging test We took cooked foods (supermarket croquettes, fried fish, chicken, etc.) and took them home, but no oil oozing due to penetration was observed after 6 hours.

[Summary of Example 1]
Even in the folds, an oil-resistant paper with little deterioration in oil resistance and a packaging bag using the oil-resistant paper could be produced. Wrapping oily ingredients such as deep-fried food purchased from fast food stores and department stores, etc., and when taking it home, the oil does not ooze out and contaminate other purchased products, clothes, hands, etc. A package can be provided. By creating a paper substrate with a flexible layer at the papermaking stage, it was possible to create an oil-resistant paper with less oil resistance degradation at the ruled line without increasing the number of oil-proofing steps.

[Example 2]
(sample)
A paper having the following flexible layer formed was made into a base paper base material.
[Flexible layer] The following softener is added to the raw material of one layer on one side (pulp raw material in a slurry state).
Softener ... Ethylene glycol monoisostearate (5% added to 100 parts of raw pulp)
Surfactant ... Cationic surfactant Disper TL (Meisei Chemical)
(0.3% added to 100 parts raw pulp)
[Papermaking] Manufactured from various pulps by a normal papermaking process.
[Layer structure] Ivory base paper of 5 layers structure [basis weight] 290 g / m ²
[Oil Resistant Layer] (Main Agent) An aqueous acrylic resin emulsion having a solid content of 40% was used on the paper on which the flexible layer was formed. (Coating amount) The dry coating amount was applied as a 6 g / m ² · single-sided oil-resistant layer.

[Shape and evaluation]
A tray-shaped container was created and the oil resistance of the ruled lines was evaluated.

The ruled line width was 1.2 mm and the ruled line height was 150 μm.
Evaluation)
-Planar oil resistance (room temperature oil resistance) Castor oil (KIT1) and several drops of KIT12 were dropped and cleared. (Diameter oil resistance) When castor oil was applied to the surface of the fiber structure with a brush, it penetrated after one week. The amount of penetration was as small as the tip of the needle.
-Ruled line (crease) oil resistance (room temperature oil resistance) Castor oil (KIT1) and several drops of KIT5 were cleared when dropped.
(Oil resistance at diameter) When castor oil was applied to the surface of the fiber structure with a brush, it penetrated after 5 days. The amount of penetration was as small as the tip of the needle.
・ Real packaging test We took cooked foods (supermarket croquettes, fried fish, chicken, etc.) and took them home, but no oil oozing due to penetration was observed after 6 hours.

[Summary of Example 2]
Even in the ruled line portion, it was possible to produce an oil-resistant paper with little deterioration in oil resistance and a packaging bag using the same. Wrapping oily ingredients such as deep-fried food purchased from fast food stores and department stores, etc., and when taking it home, the oil does not ooze out and contaminate other purchased products, clothes, hands, etc. A package can be provided. By creating a paper substrate with a flexible layer at the papermaking stage, it was possible to create an oil-resistant paper with less oil resistance degradation at the ruled line without increasing the number of oil-proofing steps.

[Example 3]
(sample)
The following paper was made into a base paper base.
[Flexible layer] None [Papermaking] Manufactured from various pulps by a normal papermaking process.
[Layer structure] Ivory base paper of 1 layer structure [basis weight] 100 g / m ²
[Oil Resistant Layer] (Main agent) A saponified polyvinyl alcohol resin was used for paper, and the fiber structure substrate (T) was coated on the front and back surfaces by a gravure printing machine. A product (Kuraray PVA-117) having a saponification degree of 98 to 99 mol% and a viscosity (4%, 20 ° C.) of 25 to 31 mPa · s was prepared to a solid content of 7% and used. (Crosslinking) As a crosslinking agent, 0.6% of ammonium zirconium carbonate, which is an inorganic crosslinking agent, was added to the polyvinyl alcohol resin to prepare a mixed resin.
(Coating amount) The dry coating amount was 3 g / m ² · coated as a single-side oil-resistant layer.

[Shape and Evaluation] A simple creased sachet was made and the oil resistance of the crease portion was evaluated.
Evaluation)
-Planar oil resistance (room temperature oil resistance) Castor oil (KIT1) and several drops of KIT12 were dropped and cleared. (Diameter oil resistance) When castor oil was applied to the surface of the fiber structure with a brush, it penetrated after one week. The amount of penetration was as small as the tip of the needle.
-Ruled line (crease) oil resistance (room temperature oil resistance) Castor oil (KIT1) and several drops of KIT5 were cleared when dropped.
(Diameter oil resistance) When castor oil was applied to the surface of the fiber structure with a brush, it penetrated after several seconds. The penetration amount was as small as the tip of the needle, but increased with time.
-Real packaging test Cooked foods (croquettes such as supermarkets, fried fish, chicken, etc.) were carried back to the house, but oil bleed was observed in the ruled line portion after 30 minutes.

[Summary of Example 3]
In the ruled line portion, the oil resistance has deteriorated.

[Example 4]
(sample)
The following paper was made into a base paper base.
[Flexible layer] None [Papermaking] Manufactured from various pulps by a normal papermaking process.
[Layer structure] Ivory base paper of 5 layers structure [basis weight] 290 g / m ²
[Oil Resistant Layer] (Main agent) An aqueous acrylic resin emulsion having a solid content of 40% was used for paper. (Coating amount) The dry coating amount was applied as a 6 g / m 2 · single-sided oil resistant layer.
[Shape and evaluation]
A tray-shaped container was created and the oil resistance of the ruled lines was evaluated.

The ruled line width was 1.2 mm and the ruled line height was 150 μm.
Evaluation)
-Planar oil resistance (room temperature oil resistance) Castor oil (KIT1) and several drops of KIT12 were dropped and cleared. (Diameter oil resistance) When castor oil was applied to the surface of the fiber structure with a brush, it penetrated after one week. The amount of penetration was as small as the tip of the needle.
-Ruled line (crease) oil resistance (room temperature oil resistance) Castor oil (KIT1) and several drops of KIT5 were cleared when dropped.
(Diameter oil resistance) When castor oil was applied to the surface of the fiber structure with a brush, it penetrated after several seconds. The penetration amount was as small as the tip of the needle, but increased with time.
-Real packaging test Cooked foods (croquettes such as supermarkets, fried fish, chicken, etc.) were carried back to the house, but oil bleed was observed in the ruled line portion after 30 minutes.

[Summary of Example 4]
In the ruled line portion, the oil resistance has deteriorated.
(The invention's effect)
As described above, according to the present invention, it is possible to provide a ruled line portion (oil-resistant paper at low cost with low manufacturing cost.

The schematic diagram which shows the cross-sectional structure of the fiber structure which concerns on the 1st Embodiment of this invention. The schematic diagram which shows the cross-sectional structure of the fiber structure which concerns on the 1st Embodiment of this invention.

Explanation of symbols

T ... fiber layer, R1 ... oil resistant layer, R2 ... flexible layer, Ts ... oil resistant paper

Claims (4)

  Oil-resistant paper, characterized in that a fiber structure is a sheet-like paper that has been processed with a softening agent and is coated with a water-soluble resin as an oil-resistant layer on the layer treated with the softening agent . 2. The paper according to claim 1, wherein the paper is 200 g / m ² or more of multi-layered paper, the outermost layer on one side is treated with a softening agent, and an acrylic resin or a polyester resin is applied on the treated layer. An oil-resistant paper, wherein an oil-resistant agent in which a water-soluble resin of SBR latex is used alone or mixed is applied. The paper according to claim 1, wherein the paper is a single-layered paper of less than 200 g / m ² , all layers are treated with a softener, and a polyvinyl alcohol resin and a starch-based resin are formed on the treated layer. Oil-resistant paper, characterized in that it is coated with a single or mixed oil-resistant agent.   A container made of the oil-resistant paper according to any one of claims 1 to 3.

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