JP2829181B2 - Breathable oil-repellent paper and method for producing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a breathable repellent material having moderate air permeability, oil repellency, heat sealability, water resistance and heat resistance, which is suitable for use in packaging oily cooked foods such as fried foods. Oil on paper.

[0002]

2. Description of the Related Art In recent years, the demand for cooked foods such as prepared foods has been increasing, and when these are packaged at stores, it is required that oil does not leak from the packaging material. However, the types of packaging materials to be wrapped at stores are limited, and most of them use bags made of polyolefin-based resin films or bags formed by laminating polyolefin-based resin films and paper. These bags have high gas and liquid barrier properties, prevent water and oily drips from prepared foods from leaking out of the bag, and have high bag strength and heat sealability. It is widely used because it can be sealed. However, when fried foods such as tempura, fried and fried foods, especially freshly cooked fried foods are wrapped in the above-mentioned bag-like material, water vapor emanating from food is also trapped in the bag, so that water vapor inside the bag is However, there is a drawback that the fried food becomes excessively soft with moisture and the taste is significantly impaired.

[0003] As a packaging material capable of releasing water vapor emitted from food to the outside and having heat sealing properties, a laminate of a plastic film provided with small holes and paper (Japanese Utility Model Application Laid-Open No. 62-203028), a polyolefin fiber, and the like. Heat-sealing nonwoven fabric and paper laminate (Japanese Patent Laid-Open No. 61-339)
52) has been proposed. However, such packaging materials do not have oil repellency, and when packaging foods with a high oil content such as fried foods, oils and fats will seep out onto the surface of the packaging material through small holes in the plastic film or voids in the nonwoven fabric. Not suitable for food packaging. It has also been proposed to obtain a packaging material having both air permeability, heat sealability and oil repellency by laminating a plastic film provided with small holes and paper coated with an oil repellent (JP-A-63-5507).
No. 5), since the diameter of the small hole is as large as 20 to 3000 μ, when packaging the oily food with the plastic film side inside, the fat easily passes through the small hole and reaches the paper surface, so that the laminated product Has a substantial dependence on the oil repellency of the paper. However, it is not only difficult to obtain oil repellency enough to prevent the exudation of fats and oils on paper simply coated with an oil repellent, but also it is inevitable that the oil repellency of the bonding surface of the paper due to lamination processing is reduced. Not suitable for packaging oily foods.

[0004]

According to the experiments of the present inventors, even if an oil repellent is internally added or applied to a conventional porous heat-sealed paper, foods having a limited oil repellency and high oil content can be obtained. It was found that when wrapped, oil seepage was inevitable. In order to prevent oil seepage, it is not sufficient to use an oil repellent alone, and the base sheet must be made dense and dense.

The inventor of the present invention has air permeability to release water vapor when cooked foods, frozen foods and the like are packaged and heated in a microwave oven or the like, but has sufficient oil repellency to fats and oils. In order to provide a heat-sealed paper having the same, a breathable oil-repellent paper has been proposed (Japanese Patent Application No. 2-198868).
issue). In the breathable oil-repellent paper according to the earlier application,
The heat-sealing layer is formed with a myriad of thermoplastic multi-branched fibers and thermoplastic bicomponent fibers and heat-treating conditions.
It has a gas permeability of 1 / min or more and is capable of releasing water vapor, but is a sufficiently clogged layer capable of preventing the seepage of oil. Oils and fats from food to be packaged are stopped by the heat seal layer and do not exude to the non-heat seal layer made of natural fibers for papermaking.

However, according to a subsequent study, the breathable oil-repellent paper according to the above-mentioned application can prevent oil from oozing out when left standing in a microwave oven. When used in food packaging bags, when the purchaser carries around, when the bag and fried foods come into close contact with each other due to external force due to contact and pressure with other articles, oil penetrates to the non-heat-sealing layer, It turned out that there was a drawback that it oozed out of the bag.

[0007] In view of the above problems, the present invention provides heat resistance that does not deform or melt even when packaging oily foods and fried foods immediately after cooking, and that the oils and fats from foods penetrate to the other side. It is an object of the present invention to provide a heat-sealing paper having oil repellency that does not permeate water, air permeability that can radiate water vapor, and water resistance that has a small decrease in strength due to condensation of water vapor.

[0008]

SUMMARY OF THE INVENTION The present inventor has proposed that the heat sealing layer be made of a gas-permeable, oil-repellent material having a large number of small holes formed therein and capable of preventing oil seepage. The non-heat-sealing layer also achieves the above object by controlling the basis weight and the inter-fiber voids so that the non-heat-sealing layer has a specific air permeability that can have air permeability and oil resistance.

According to the present invention, there is provided a thermoplastic fiber comprising at least two kinds of synthetic resin components having different melting points.
90% by weight of natural fiber for papermaking or semi-synthetic fiber for papermaking 70
10 to 10% by weight, the low melting point component of the thermoplastic fiber is melted and solidified, and the high melting point component of the thermoplastic fiber and the natural fiber for papermaking or the semi-synthetic fiber for papermaking are maintained in the form of a breathable heat seal. Layer and a non-heat-sealing layer made of natural fibers for papermaking and having an air permeability of 20 seconds / 100 cc or more and less than 500 seconds / 100 cc are joined together by bonding, and a fluorine-based surfactant is dispersed therein. Temper 50
The present invention relates to a breathable oil-repellent paper having an oil resistance of 10 or more per second / 100 cc to 500 seconds / 100 cc on the non-heat seal layer side.

The breathable oil-repellent paper comprises 30 to 90% by weight of a thermoplastic fiber composed of at least two kinds of synthetic resin components having different melting points and 70 to 10% by weight of a natural fiber for papermaking or a semisynthetic fiber for papermaking. Becomes 5000m
1 / min or more heat-sealing layer and air permeability made of natural fibers for papermaking are 20 seconds / 100 cc or more and 500 seconds / 10
A non-heat-sealing layer of less than 0 cc is joined together by bonding to form a bonding paper, and a fluorine-based surfactant is internally added and / or impregnated with the fluorine-containing surfactant before the bonding. After the oil repellent treatment, the bonded paper can be manufactured by heating and pressing at a temperature higher than the melting point of the low melting point component of the thermoplastic fiber and lower than the melting point of the high melting point component of the thermoplastic fiber.

In the present invention, air permeability refers to JIS P
8117 (1980), which is expressed as so-called Gurley air permeability, and 100 cc of air
Is the number of seconds required to pass through, so that the smaller the value of the air permeability, the higher the air permeability. However, a region having extremely high air permeability cannot be measured by air permeability. In this case, measurement can be performed according to ISO Standard 2965 (1979), and the result is displayed as air permeability. The display unit of the air permeability is exactly ml / min · cm ² · 100 mmH ₂ O
, But is abbreviated as ml / min. It can be said that the larger the value of the air permeability, the higher the air permeability. Air permeability is about 136 seconds / 100cc or less, air permeability is 57ml / min
In the following regions, the air permeability can be measured by any method. In the present invention, air permeability is used as an index of air permeability, but in regions with high air permeability that cannot be measured by air permeability, the air permeability is displayed as necessary.

In the present invention, a thermoplastic fiber composed of at least two or more types of synthetic resin components having different melting points is a so-called thermoplastic composite in which the short fiber itself is composed of two or more types of thermoplastic synthetic resin components having different melting points. It may be a fiber or a mixture of two or more types of thermoplastic short fibers formed from synthetic resin components having different melting points.

The thermoplastic conjugate fiber is generally a core-sheath short fiber in which a core having a high melting point forms a sheath and a sheath having a low melting point forms a sheath.
63 ° C.) and an ethylene-vinyl acetate copolymer (melting point 96-100 ° C.) or polyethylene (130-13
4 ° C.) and those using polyethylene terephthalate (melting point 260 ° C.) for the core and ethylene vinyl acetate copolymer or polyethylene for the sheath, or modified polyethylene terephthalate (melting point 110 ° C.). When the conjugate fiber is heated under pressure at a temperature lower than the melting point of the core component and higher than the melting point of the sheath component, the sheath component melts and bonds between the fibers, and the core component retains the fiber form. When treated with the combination of the above, a film having voids and air permeability can be obtained.

As thermoplastic fibers obtained by mixing two or more types of short fibers having different melting points, polyethylene short fibers (melting point: 1) are used.
30 ° C.), polypropylene short fibers (melting point: 163 ° C.), thermoplastic multibranched fibers, and the like, and two or more kinds having different melting points can be selected and used by mixing. Further, any of these may be mixed with the above-mentioned thermoplastic conjugate fiber and used. Regardless of whether conjugate fibers are used or different fibers are used in a mixed state, it is sufficient that the aggregate of thermoplastic fibers contains two or more components having different melting points.

[0015] The thermoplastic multibranched fiber which can be used as one of the components in the thermoplastic fiber is a hydrophilic pulp-like multibranched fiber made of a thermoplastic resin such as polyethylene or polypropylene. It is sold under the trade name SWP by Petrochemical Industry Co., Ltd. The melting point of polyethylene-based SWP is 125-135 ° C, and the melting point of polypropylene-based SWP is 140-165 ° C. When a wet paper containing thermoplastic multibranched fibers is heated and dried at a temperature below the melting point of the thermoplastic multibranched fibers to form a sheet, the highly fibrillated fibers of the thermoplastic multibranched fibers are physically An entangled sheet is formed. Even if the sheet is further heated below the melting point, there is no change in strength, and the thermoplastic multibranched fibers can be easily separated from each other. Tensile strength of the sheet to bond firmly
It has such properties that strength such as tear strength and tensile strength in the thickness direction is improved, and that air permeability is reduced by filling gaps in the sheet by melting.

The natural fiber for papermaking is preferably softwood pulp, but may also be wood pulp such as hardwood pulp, non-wood pulp such as Manila hemp pulp, sisal pulp, flax pulp, and wood pulp or non-wood pulp. Pulp that has been subjected to chemical modification such as carboxymethylation or carboxyethylation is exemplified. Semi-synthetic fibers for papermaking are short rayon fibers.

When the air-permeable heat seal layer is formed of at least two kinds of thermoplastic fibers having different melting points and a natural fiber for papermaking or a semi-synthetic fiber for papermaking, after joining together with the non-heat-sealing layer, A heat treatment under pressure is performed so that the low-melting-point component of the thermoplastic fiber is melted and solidified to firmly hold the fiber to impart strength to the product, and to fill the voids between the fibers so as to have appropriate air permeability. The thermoplastic fiber is also a main component that gives heat seal strength to the product, and the natural fiber for papermaking or the semi-synthetic fiber for papermaking increases the interlayer bonding strength between the heat seal layer and the non-heat seal layer,
When treated with a fluorine-based surfactant, it exhibits higher oil repellency compared to thermoplastic fibers, and as a result, has the effect of increasing the oil repellency of the entire heat seal layer. Even if the low melting point component of the fiber is melted, the natural fibers for papermaking and the semi-synthetic fibers for papermaking are not melted, and the gap between the fibers is held to some extent, so that the heat seal layer has an effect of giving appropriate air permeability. Things.

For this reason, the compounding amount is set so as to obtain necessary strength and air permeability. The compounding amount is 3 thermoplastic fibers.
0 to 90% by weight, and 70 to 10% by weight of natural fibers for papermaking or semi-synthetic fibers for papermaking. 30% by weight thermoplastic fiber
70 or less natural fibers for papermaking or semi-synthetic fibers for papermaking
If the amount is more than 90% by weight, sufficient heat sealing strength cannot be obtained, and if the amount of the thermoplastic fiber is more than 90% by weight and the amount of the natural fiber for papermaking or the semi-synthetic fiber for papermaking is less than 10% by weight, the interlaminar bonding strength and the air permeability are low. Insufficient and high oil repellency cannot be imparted to the heat seal layer. Desirable blending amounts are in the range of 40 to 70% by weight of thermoplastic fiber and 60 to 30% by weight of natural fiber for papermaking or semi-synthetic fiber for papermaking.

In the thermoplastic fibers, the composition ratio of the low melting point component and the high melting point component is such that the high melting point component is 25 to 65% by weight, preferably 35 to 50% by weight of the entire thermoplastic fiber.
It is. If the high melting point component is less than 25% by weight, the low melting point component melted during the pressurization and heat treatment will fill the gaps of the sheet more than necessary, and sufficient air permeability will not be obtained, while the high melting point component will be 65% by weight. If the amount is larger, the proportion of the low melting point component which is melted and solidified by the heat treatment under pressure is small, so that the strength of the sheet becomes insufficient. A conjugate fiber is selected or a thermoplastic short fiber having a high melting point and a thermoplastic short fiber having a low melting point are selected so that the composition ratio of the low melting point component and the high melting point component is within the above range.

The natural fiber for papermaking is beaten if necessary, but the degree of beating treatment is set within a range that does not exceed 150 ml in Canadian freeness. If the Canadian freeness is 150 ml or less, appropriate air permeability cannot be obtained.

The heat seal layer composed of the above components has a basis weight of 10 to 30 g / m ² , preferably 20 to 25 g / m ² .
g / m ² . When the grammage is less than 10 g / m ² , sufficient heat sealing strength cannot be obtained, and when the grammage is more than 30 g / m ² , the air permeability becomes low and the cost increases. The air permeability of the heat seal layer before the heating and pressurizing treatment needs to be set high in view of a significant decrease in air permeability due to the treatment. Regardless of the basis weight, the air permeability of the base paper is 5000 ml / min or more, preferably 10,000 ml. / Min or more.

The non-heat-sealable layer is required to have air permeability, wet strength, oil repellency, printability, etc. in addition to the property that cannot be heat-sealed, and is formed of natural fibers for papermaking. Natural fibers for papermaking are the same as those used as one component constituting the heat seal layer, and include wood pulp such as softwood pulp, non-wood pulp such as Manila hemp pulp, and pulp obtained by chemically modifying these. is there.

According to the experiments of the present inventors, the air permeability of the non-heat-sealing layer has a great effect on the oil repellency after the addition of the fluorine-based surfactant. That is, if the single fibers of the natural fibers for papermaking are each subjected to an oil-repellent treatment with a fluorine-based surfactant,
The fibers alone or the non-heat-sealing layer, which is an aggregate thereof, are hardly wetted by the oil, and exhibit oil repellency.
However, in this case, if the inter-fiber gap of the non-heat-sealing layer is large, the fiber itself is not wetted by the oil, and the oil is stored in the inter-fiber gap while maintaining a large contact angle with the fiber. If it penetrates the front and back of the non-heat-sealing layer, it will permeate to the opposite side. Therefore, it is not enough to provide oil repellency on the opposite surface of the non-heat-sealing layer, which does not allow oil to permeate, by only using oil-repellent treatment with a fluorine-based surfactant. It is necessary to control the basis weight of the heat seal layer and the space between the fibers. The amount of voids between the penetrating fibers in the non-heat-sealing layer has a correlation with the air permeability, and thus can be defined by the air permeability.

According to the experiment of the present inventor, the range of air permeability of the non-heat-sealing layer exhibiting a barrier property against oil is as follows:
20 seconds / 100 cc or more. On the other hand, in order to have air permeability capable of releasing water vapor emanating from food, the air permeability of the whole gas-permeable oil-repellent paper product is 500 seconds / 100 c.
c or less. Due to the formation of the bonding paper and the subsequent heating under pressure, the value of the air permeability of the gas-permeable oil-repellent paper becomes larger than the value of the gas permeability of the non-heat-sealing layer. In order to make it 500 seconds / 100 cc or less, it is necessary to set the non-heat seal layer alone to a lower value. For this reason, the non-heat-sealing layer
Air permeability is more than 20 seconds / 100cc and 500 seconds / 100cc
Less than, desirably 20 to 100 seconds / 100c
c, more preferably 20 to 70 seconds / 100 cc.
In order to set the air permeability in such a range that the air permeability is relatively small, the natural fibers for papermaking are beaten to a predetermined Canadian freeness according to the basis weight of the non-heat-sealing layer. The basis weight of the non-heat-sealing layer is 10 to 50 g / m ² , preferably 3 to prevent oil permeation and obtain predetermined air permeability.
0 to 40 g / m ² , but when the grammage is 10 to 30 g / m ² , 100 to 300 ml CSF, the grammage is 30 to 40 g / m ²
When m ^2, 280~450mlCSF, basis weight 40 to 5
At 0 g / m ² , by setting the beating degree in the range of 350 to 550 ml CSF, the air permeability in the above range can be obtained.

The heat-sealing layer and the non-heat-sealing layer adjusted as described above are joined by laminating.
Breathable repellent oiled paper according to the present invention, as shown in FIG. 1, or formed as a two-layer combination papers 3 consisting of non-heat seal layer 1 and the heat seal layer 2, or, as shown in FIG. 2, non The heat sealing layer 1 is formed as a three-layer laminated paper 4 sandwiched between the heat sealing layers 2 as an intermediate layer. Here, the method of laminating may be a method of drying a wet paper after laminating, which is generally used in papermaking technology. The basis weight of the entire bonding paper formed by lamination is 20 to 80 g / m ² , preferably 50 to 65 g / m ² .
² .

In the packaging of food, it is a general usage method to pack and heat seal a heat-sealing layer of a two-layer breathable oil-repellent paper having a heat-sealing layer and a non-heat-sealing layer with the heat-sealing layer in contact with the food. is there. In the case of a three-layer breathable oil-repellent paper, in the case of a double-structured bag composed of an inner bag and an outer bag, when the inner bag is partially used as an inner bag material when the inner bag is partially heat-sealed to the outer bag. Useful.

The oil-repellent treatment with a fluorine-based surfactant requires treatment of both the non-heat-sealing layer and the heat-sealing layer. That is, before making paper, a fluorine-based surfactant is added internally.
In the case of fixing, only oil repelling treatment by internal addition alone may be performed, and further, impregnation of the bonded paper after papermaking bonding with a fluorine-based surfactant may be performed. If no oil-repellent treatment by internal addition is performed before joining, impregnation of the joining paper is essential. For the impregnation of the bonding paper, for example, a method of applying a solution of a fluorine-based surfactant using a roll coater or the like is employed.

Fluorosurfactants are those having 6 to 14 carbon atoms.
Perfluoroalkyl carboxylate having a perfluoroalkyl group of, perfluoroalkyl sulfonate,
Perfluoroalkyl phosphates, perfluoroalkyl phosphoric esters, perfluoroalkyl sulfonic acid amides, and a has the fluorine compound is introduced as Pendant chains to polymer polymer fluorine-based surfactants, generally fluorinated surfactant Commercially available activators can be used.

When the fluorosurfactant is internally added to the papermaking raw material, the solid content in the form of an aqueous solution or emulsion is 0.1 to 2.0% by weight, preferably 0.2 to 0.2% by weight, based on the papermaking raw material.
Add １．０1.0% by weight. When the fluorine-based surfactant is anionic, a cationic fixing agent can be added so that the surfactant is sufficiently fixed to the papermaking raw material.
The amount of the fixing agent added is 0.1 to
Preferably, the content is 1.0% by weight. When the fluorine-based surfactant is applied by a roll coater or the like, an aqueous solution or emulsion having a solid concentration of 0.1 to 15.0% is used. The degree of oil repellency of the oil-repellent treated paper is determined by U.S. TAPPI practical test method 1988 edition UM557 "Resistance of paper and paperboard to grease, oil and wax, kit test method".
Is required to be 10 or more in the non-heat-sealing layer, and when the kit test value of the non-heat-sealing layer is less than 10, it is impossible to completely prevent oil from permeating the paper. Can not.

The oil-repellent bonded paper is heated and pressed at a temperature higher than the melting point of the low melting point component of the thermoplastic fiber and lower than the melting point of the high melting point component of the thermoplastic fiber. The pressure is
Linear pressure 20-100 kg / cm, preferably 30-80 k
g / cm. Thereby, in the heat seal layer, the low melting point component in the thermoplastic fiber is melted and solidified, and the high melting point component in the thermoplastic fiber and the natural fiber for papermaking or the semi-synthetic fiber for papermaking maintain the fiber form. . Since the non-heat-sealing layer is made of natural fibers for papermaking, there is no change in the air permeability due to the heat and pressure processing.

In order to wrap oily foods and fried foods immediately after cooking and to disperse the water vapor of the foods outside the packaging material and to completely prevent oil permeation, the air permeability is set to 50 to 500 seconds / 10.
0 cc, preferably in the range of 100 to 300 seconds / 100 cc. As described above, the air permeability of the non-heat-sealing layer is set to 20 seconds / 100 cc or more and less than 500 seconds / 100. Although it can be further adjusted by the speed, if the air permeability of the non-heat-sealing layer is smaller than 20 seconds / 100 cc and 500 seconds / 100 cc or more, the above range cannot be set.

The present invention further proposes a breathable oil-repellent paper which can achieve the above-mentioned object and which is manufactured without performing pressure heating. That is, the present invention comprises 30 to 90% by weight of a thermoplastic fiber and 70 to 10% by weight of a natural fiber for papermaking or a semi-synthetic fiber for papermaking, wherein the thermoplastic fiber and the natural fiber for papermaking or the semi-synthetic fiber for papermaking are fibers. A gas-permeable heat-sealing layer that retains its shape, and a gas permeability of 20 seconds / 100 cc or more made of natural fibers for papermaking 500
A non-heat-sealing layer of less than 100 cc / 100 cc is joined by bonding, and the air permeability obtained by dispersing the adhesive and the fluorine-based surfactant is 50 s / 100 cc to 50 cc.
Oil resistance of 1 on non-heat seal layer side at 0 sec / 100cc
It relates to zero or more breathable oil-repellent paper.

This breathable oil-repellent paper contains 30 thermoplastic fibers.
９０90% by weight and 70 to 10% by weight of natural fiber for papermaking or semi-synthetic fiber for papermaking 5,000 ml / m
in and a non-heat-sealing layer made of natural fibers for papermaking and having an air permeability of 20 seconds / 100 cc or more and less than 500 seconds / 100 cc to form a bonded paper. And an oil-repellent treatment by impregnating the bonding paper with a fluorine-based surfactant. Since this breathable oil-repellent paper is manufactured without applying pressure and heat treatment, an adhesive is dispersed and blended into the sheet instead of bonding between fibers and adjusting the gap by melting the low melting point component of the thermoplastic fiber. Give strength.

The thermoplastic fibers contained in the heat seal layer, as long as it is made of a thermoplastic synthetic resin component which can Ru give heat sealing properties to the product, short fibers alone having a relatively low melting point such as polyethylene, Short fibers having a relatively high melting point, such as polypropylene, may be used alone, or a mixture thereof, or a thermoplastic composite fiber used in the case of breathable oil-repellent paper manufactured through the above-described pressure and heat treatment may be used. . However, since it is manufactured without going through the pressure heating step, these thermoplastic fibers are not dependent on the melting point,
The fiber form is maintained in the breathable oil-repellent paper without melting and solidifying.

The definition of the natural fiber for papermaking or the semi-synthetic fiber for papermaking contained in the heat-sealing layer, the natural fiber for papermaking constituting the non-heat-sealing layer, the air permeability for evaluating the air permeability, and the air permeability are as described above. This is the same as the case of the breathable oil-repellent paper manufactured through the pressure and heat treatment described above.

The blending amount of the heat seal layer is 30 to 90% by weight of the thermoplastic fiber and 70 to 10% by weight of the natural fiber for papermaking or the semi-synthetic fiber for papermaking. If the content of the thermoplastic fiber is less than 30% by weight, sufficient heat sealing strength cannot be obtained for the product, and if it is more than 90% by weight, the bonding strength between the non-heat sealing layer and the non-heat-sealing layer is weakened, and delamination becomes easy. The preferred blending amount of the thermoplastic fiber is 40 to 60% by weight.
It is.

If necessary, hot water-soluble polyvinyl alcohol short fibers can be added to the heat seal layer. In particular, when semi-synthetic fibers for papermaking, that is, short rayon fibers, are added, it is desirable to add hot water-soluble polyvinyl alcohol short fibers in order to reinforce the inter-fiber bonds of the short rayon fibers. However, the addition of the hot water-soluble polyvinyl alcohol short fiber does not exceed 10% by weight. If it exceeds this range, the papermaking properties will deteriorate and the cost will increase.

The natural fibers for papermaking are beaten if necessary, but the degree of beating treatment is set within a range that does not exceed 150 ml in Canadian freeness. If the Canadian freeness is 150 ml or less, appropriate air permeability cannot be obtained.

The heat seal layer composed of the above components has a basis weight of 10 to 30 g / m ² , preferably 20 to 25 g / m ² .
g / m ² . When the grammage is less than 10 g / m ² , sufficient heat sealing strength cannot be obtained, and when the grammage is more than 30 g / m ² , the air permeability becomes low and the cost increases. The air permeability of the heat seal layer before impregnation with the adhesive and the fluorine-based surfactant must be set high in consideration of a significant decrease in air permeability due to the impregnation. Regardless of the basis weight, the air permeability of the base paper is 5000 ml / min. Above, preferably 10,000 ml
/ Min or more.

The non-heat-sealing layer is formed in the same manner as in the case of the breathable oil-repellent paper produced by the above-described pressure and heat treatment.
Made of natural fiber for papermaking, 20 sec / 100cc or more 50
What was beaten according to the basis weight is used so that the air permeability is less than 0 second / 100 cc.

The heat seal layer and the non-heat seal layer which is created in the above manner, the paper making process in the papermaking art, paper combined paper making two layers as shown in FIG. 1 or FIG.
2 is formed as a three-layer laminated paper having a non-heat-sealing layer as an intermediate layer. The basis weight of the entire bonding paper is
20 to 80 g / ^{m 2,} preferably 50~65g / ^{m 2.}

After the paper making, the joining paper is impregnated with an aqueous solution of polyvinyl alcohol or an acrylic or latex emulsion adhesive. For the impregnation, a roll coater, a size press, or the like can be used. As the polyvinyl alcohol, a completely saponified type having a saponification degree of 96 mol% or more is used, and preferably, a saponification degree of 99.5 mol% or more and an extremely low sodium acetate content is used. The concentration of the aqueous solution is preferably 2 to 6% by weight, and the viscosity of the solution is preferably in the range of 10 to 100 centipoise. Acrylic emulsion adhesive is an aqueous emulsion of an acrylate copolymer, and latex emulsion adhesive is styrene-butadiene copolymer (SBR), maleic acid-butadiene copolymer (MBR) And an aqueous emulsion such as a nitrile-butadiene copolymer (NBR), which has crosslinking reactivity, has high water resistance after drying, and does not have heat sealability. These are required to be compatible with the fluorine-based surfactant, and are preferably nonionic or anionic, and may be used as a mixture of two or more kinds. Used in the range of 10-100 centipoise.

The oil repellent treatment is performed by impregnating both the non-heat-sealing layer and the heat-sealing layer with a fluorinated surfactant.
It can be carried out simultaneously with the impregnation of the aqueous solution of polyvinyl alcohol or the acrylic or latex-based adhesive, but after the impregnation of the adhesive, it may be applied again using a roll coater, a size press or the like. In each case, the solid concentration of the fluorine-based surfactant is set to 0.1 to 15.0% by weight, and the solution is applied with an aqueous solution or an emulsion.

The type of the fluorine-based surfactant and the degree of oil repellency of the oil-repellent treated paper are the same as in the case of the air-permeable oil-repellent paper produced by the above-mentioned pressurizing and heating treatment. In order to wrap oily foods and fried foods immediately after cooking to evacuate the water vapor of the foods to the outside of the packaging material and to completely prevent oil permeation, the air permeability is 50 to 500 seconds / 100 cc, preferably 100 cc. ３００300 seconds / 100 cc. Although the air permeability of the sheet is slightly reduced due to the film increasing effect of the adhesive, the air permeability of the non-heat-sealing layer is reduced by 20 as described above.
Seconds / 100cc or more and less than 500 seconds / 100,
Further adjustment is made according to the solid concentration of the adhesive to be impregnated.

The heat-sealing layer and the non-heat-sealing layer are formed in any of the breathable oil-repellent paper manufactured through the above-mentioned pressurized heat treatment and the breathable oil-repellent paper manufactured without the pressurized heat treatment. It is desirable to add a wet strength agent to provide wet strength. As the wet paper strength enhancer, polyamide polyamine epichlorohydrin resin, dialdehyde starch and the like can be used, and the amount of the additive is 0.1 to 1.0% as a solid content with respect to the natural fiber for papermaking or the semi-synthetic fiber for papermaking. , Preferably 0.3 to 0.5%.

[0046]

The breathable oil-repellent paper according to the present invention can be used in any case,
The non-heat-sealing layer has an excellent barrier property against fats and oils by forming natural fibers for papermaking as a closed layer having a predetermined air permeability by an appropriate beating treatment and being subjected to an oil-repellent treatment. . Further, an interlayer strength is given by papermaking bonding between the papermaking natural fiber of the non-heat-sealing layer and the papermaking natural fiber or the papermaking semi-synthetic fiber contained in the heat-sealing layer.

The breathable oil-repellent paper manufactured through the pressure and heat treatment according to the present invention is characterized in that the high melting point component of the thermoplastic fiber and the natural fiber for papermaking or the semi-synthetic fiber for papermaking maintain the fiber form in the heat seal layer. However, since the low melting point component of the thermoplastic fiber is melted and solidified to appropriately fill the voids between the fibers, the fibers form a net leaving fine through voids between the fibers. It is provided with air permeability and has a barrier property against fats and oils by being subjected to an oil repellent treatment. Further, the heat sealing layer has excellent wet strength due to the reinforcing effect of the high melting point component of the thermoplastic fiber.

The breathable oil-repellent paper produced without the pressure and heat treatment according to the present invention is characterized in that the thermoplastic fiber and the natural fiber for papermaking or the semi-synthetic fiber for papermaking maintain the fiber form in the heat-sealing layer. since the adhesive distributed between these are adhered to the intensity solid leaving through gap, given the strength and moderate breathability, also added oil repellency by being a fluorine-based surfactant dispersed among the fibers Is done.

[0049] As a result, the heat seal layer and Bali ya over against somewhat fat, further air permeability of 20 seconds / 10
Since the non-heat-sealing layer of 0 cc or more has a complete barrier property against fats and oils, the leakage of a large amount of fats and oils from food is prevented. In addition, 500 seconds / 10
An air permeability of 0 cc or less has sufficient air permeability to release water vapor from freshly cooked food.

Further, the breathable oil-repellent paper manufactured without the pressure and heat treatment according to the present invention has a thin sheet,
It becomes bulky and strong (rigid).

[0051]

EXAMPLES Examples of the permeable oil-repellent paper according to the present invention will be described below. In each example, oil resistance, air permeability, air permeability,
The interlayer strength, heat seal strength, wet tensile strength, oil leakage, surface strength, and stiffness were evaluated as follows.

[Oil resistance] TAPPI practical test method UM55
7 (1988). The test piece was placed with the test surface up, a drop of the kit test solution was dropped from a height of 25 mm, and after 15 seconds, the excess solution was wiped off, and it was observed whether the kit test solution permeated and became transparent.
The test was performed on 12 kinds of test liquids having different compositions, and the maximum liquid number that did not become transparent was indicated as oil resistance.

[Air permeability] ISO Standard 2965
According to (1979), the amount of air passing through 1 cm ² of one test piece was measured at a differential pressure of 100 mmH ₂ O using a tobacco wrapping paper air permeability meter.

[Air permeability] JIS P8117 (198
In accordance with 0), the time required for 100 cc of air to permeate was measured in seconds using a Denso meter type model B manufactured by Toyo Seiki Co., Ltd., and was indicated as Gurley air permeability. This device comprises an outer cylinder and an inner cylinder whose upper part is closed by sliding freely up and down in the outer cylinder. The gap between the outer cylinder and the inner cylinder is filled with oil, and when the inner cylinder moves from top to bottom, the air of the inner cylinder is filled with an area 64 provided at the bottom of the outer cylinder.
It has a structure that exits through an opening of 5 mm ² . Place the sample sheet in this opening, tighten it, and weigh 567 g
The inner cylinder is dropped by its own weight from above, and the air in the cylinder is 100cc.
The time during which the sample passes through the sample and is discharged out of the cylinder is measured in seconds.

[Relationship Between Air Permeability and Air Permeability] The following regression equation was obtained as a result of measuring the relationship between air permeability and air permeability using a gas permeable oil-repellent paper. From this equation, it can be said that the air permeability and the air permeability can be measured in the following range. Air permeability (ml / min): 56.85-0 Air permeability (sec / 100 cc): 0-136.0 When the air permeability is 56.85 ml / min or more,
Air permeability cannot be measured, air permeability is 136.0 sec / 100c
In the range of c or more, the air permeability cannot be measured.

[Interlayer strength] One end of a test piece having a width of 15 mm and a length of 200 mm was separated into a non-heat-sealing layer and a heat-sealing layer, and was peeled off by 100 mm by a T-peeling test method using a Tensilon universal tensile tester. The maximum value between them was taken as the interlayer strength.

[Heat Seal Strength] Using a heat seal tester (manufactured by Tester Sangyo Co., Ltd.) at 160 ° C., 2 k
After heat sealing at g / cm ² for 2 seconds, a 15 mm width cut T-peel test was performed to determine the peel strength, which was taken as the heat seal strength.

[Wet tensile strength] width 15 mm, length 20
After a test piece of 0 mm was immersed in tap water at 20 ° C. for 30 minutes, excess water was wiped off with a filter paper, and the tensile strength was measured with a Shopper type tensile tester.

[Oil Leakage Test] A gas-permeable oil-repellent paper was bent with the heat-sealing surface inside, and the outer width × height was 100 m.
A two-sided sealed bag of mx 150 mm was prepared. 1 in this bag
30 g of tempura oil (manufactured by Nisshin Oil Co., Ltd.) at 00 ° C. is added, and the opening is heat-sealed and placed on a filter paper. A metal plate having the same external size as the bag and having a weight of 300 g is placed on the filter paper for 3 hours. I left it. Three hours later, if even one point of oil stains occurred on the surface of the filter paper on which the bag was placed, it was judged that there was leakage, and those without any stain were evaluated as having no leakage.

[Surface strength] JIS P8129 (197
It measured by the method using the wax described in 6). A series of numbered waxes with sequentially increasing adhesiveness are fused to the sample sheet surface, and after cooling, the wax is peeled off from the sheet surface, and the highest wax number that does not damage the sheet surface is the surface strength and did.

[Stiffness] US TAPPI Standard
Measured with a Clark stiffness tester according to T451hm-84 (1986). Width 25.4mm, length 170m
Attach one end of the m test piece to the horizontal rotation axis, adjust the length from the rotation axis to the other end of the test piece, rotate at a speed of 1 revolution per minute and test when the rotation angle is 90 ° ± 2 ° The length of the test piece that causes the piece to fall to the opposite side is determined, and this is defined as the critical length. Stiffness is calculated by the following equation. Stiffness = (critical length cm) ³ ÷ 100

Example 1 A two-layer laminated type breathable oil-repellent paper having a basis weight of 60 g / m ² and used for a packaging bag in which fried tempura was placed was produced as follows.

The bleached softwood pulp is 440 Canadian freeness.
ml CSF, and a polyamide polyamine epichlorohydrin-based wet paper strength agent (Dick Hercules Co., trade name: Sponge 557, hereinafter Sponge 557H)
) Was added as a first papermaking raw material by adding 0.5% by weight (solid content / solid content).

Next, as a second papermaking raw material, a core-sheath type thermoplastic composite fiber composed of an ethylene vinyl acetate copolymer and polypropylene in a weight ratio of 1: 1 (trade name: NBF Fiber E, manufactured by Daiwa Spinning Co., Ltd.) Mold, hereinafter abbreviated as NBF-E) 45% by weight and polyethylene-based thermoplastic multibranched fiber (manufactured by Mitsui Petrochemical Industries, Ltd., trade name SWP, hereinafter abbreviated as SWP) 1
A blend of 5% by weight and 40% by weight of bleached softwood pulp beaten to a Canadian freeness of 650 ml CSF was prepared.

The low melting point component of the thermoplastic fiber is the ethylene-vinyl acetate copolymer and the SWP polyethylene in the thermoplastic conjugate fiber, and the high melting point component is the polypropylene in the thermoplastic conjugate fiber. The proportion of the high melting point component occupying was 37.5% by weight.

The above two types of papermaking raw materials were introduced into individual cylinder cylinders of a Yankee type cylinder paper machine equipped with two cylinder cylinders, and a two-layer laminated paper having a basis weight of 59.5 g / m ² was obtained. Was manufactured. The basis weight of the non-heat-sealing layer formed from the first papermaking raw material is 35 g / m ² , and the air permeability is 26 seconds / 100.
In cc, the basis weight of the heat seal layer formed from the second papermaking raw material is 24.5 g / m ² , and the air permeability is 8820 ml / mi.
n. Next, the two-layer laminated paper contained 1.5% by weight (solid content) of a fluorine-based surfactant (Asahigard AG530, manufactured by Asahi Glass Co., Ltd.) using a roll coater, and 10% by weight of ethyl alcohol. An oil-repellent treatment liquid consisting of water and 88.5% by weight was applied at a rate of 0.5 g / m ² to give a total basis weight of 60 g / m ² .

The two-layer laminated paper subjected to the oil-repellent treatment was subsequently pressed at a roll temperature of 150 ° C. and a pressure of 80 kg between the rolls.
/ Cm was passed through a super calender, and the thermoplastic composite fiber and the thermoplastic multibranched fiber of the heat seal layer were melt-fused.

The thus obtained sheet-like material having a two-layer structure of a non-heat-sealing layer made of wood pulp on one side and a heat-sealing layer made of synthetic fiber having air permeability and wood pulp on the other side is obtained. The airness, oil resistance, interlayer strength, heat seal strength, wet tensile strength, oil leakage and the like were measured and the results are shown in Table 1. The sheet material has an air permeability of 180 seconds / 100 cc and an oil resistance of 12 on the non-heat-sealing surface, and has no leakage of tempura oil at 100 ° C.
It had sufficient air permeability and oil resistance.

After a pattern was gravure-printed on the non-heat-sealing layer of the sheet material, it was heat-sealed by an automatic bag making machine to produce a gusset bag (folded bag) having a length of 25 cm and a width of 27 cm. Sprinkle with a mixture of 300 parts by weight of tempura flour (manufactured by Nisshin Flour Milling Co., Ltd.) and 180 parts by weight of water, and put in tempura oil (manufactured by Nisshin Seifun Co., Ltd.) at 180 ° C. for 2 minutes. Then, one piece of tempura, which was taken out and drained on a wire mesh for 10 seconds, was put into the bag, the inlet was heat-sealed and hermetically sealed, and the bag was hung with its upper end sandwiched and left to stand. After 3 hours, no oil seepage was seen on the bag surface, and even if tempura was added, excess tempura oil was not able to seep into the bag inner surface and accumulated. Also, no dew condensation was observed on the inner surface of the bag, and it was clear that the water vapor emanating from the tempura immediately after the frying was escaping to the outside through the air-permeable bag. After 3 hours, the tempura garment does not absorb moisture and becomes soft, it is brittle, has a crisp texture, has the texture of tempura immediately after being fried, and maintains favorable quality as a product. Was.

Example 2 A two-layer laminated breathable oil-repellent paper having a basis weight of 56 g / m ² and used for a fried chicken packaging bag was produced as follows.

The bleached softwood pulp is 280 Canadian freeness.
After refining to 0.5 ml CSF, sponge 557H was added to 0.5
% By weight (solid content / solid content), and then 0.45 weight% (solid content / solid content) of a fluorine-based surfactant (Sumitomo Chemical Industries, Ltd., trade name: Sumireze Resin FP150)
Added, the fluorine-based surfactant fixing agent thereafter (Sumitomo Chemical Co., Ltd., trade name Sumirez Resin F R -2
0.3% by weight of P) was added to obtain a first papermaking raw material.

Next, as a second papermaking raw material, a core-sheath type thermoplastic composite fiber composed of ethylene vinyl acetate copolymer and polypropylene at a weight ratio of 1: 1 (trade name: EA fiber, manufactured by Chisso Corp.) (Hereinafter abbreviated as EA fiber) 45% by weight and S
After blending WP 5% by weight and softwood bleached pulp 50% by weight beaten to Canadian freeness 280ml CSF,
0.25% by weight of sponge 557H (solid content / solid content)
One prepared by adding 0.45% by weight (solid content / solid content) of the fluorine-based surfactant and 0.3% by weight of the fixing agent was prepared.

The low melting point component of the thermoplastic fiber is the ethylene-vinyl acetate copolymer and the SWP polyethylene in the thermoplastic conjugate fiber, and the high melting point component is the polypropylene in the thermoplastic conjugate fiber. The proportion of the high melting point component occupying is 45% by weight.

The above two types of papermaking raw materials were introduced into individual cylinder cylinders of a Yankee type cylinder paper machine equipped with two cylinder cylinders to produce a two-layer laminated paper having a basis weight of 56 g / m ^2. did. The basis weight of the non-heat-sealing layer formed from the first papermaking raw material is 33 g / m ² , and the air permeability is 74 seconds / 100 cc.
The basis weight of the heat seal layer formed from the second papermaking raw material was 23 g / m ² and the air permeability was 27900 ml / min.

The two-layer laminated paper thus obtained was continuously rolled at a temperature of 145 ° C. and a pressure of 90 kg / c between the rolls.
m, and the thermoplastic composite fiber and the thermoplastic multibranched fiber of the heat seal layer were melted and fused.

Examples of the thus obtained sheet-like material having a two-layer structure of a non-heat-sealing layer made of wood pulp on one side and a heat-sealing layer made of synthetic fiber having air permeability and wood pulp on the other side are shown in Examples. Table 1 shows the results of measuring the characteristics in the same manner as in Example 1. As can be seen in Table 1, the product of the present invention based on Example 2 had an air permeability of 132 seconds / 1.
100 cc, oil resistance 12 on non-heat-sealed surface, 100
There was no leakage of tempura oil at ℃, and it had sufficient air permeability and oil resistance. Further, the heat seal strength, the interlayer strength, and the wet tensile strength were sufficient for practical use.

After a pattern was gravure-printed on the non-heat-sealing layer of the sheet material, it was heat-sealed by an automatic bag making machine to produce a gusset bag (folded bag) having a length of 25 cm and a width of 27 cm. The frozen frozen meat (produced by Nippon Ham Co., Ltd.) for fried chicken was put into 180 ° C. tempura oil (produced by Nisshin Oil Co., Ltd.) for 3 minutes, then taken out, and the oil was removed on a wire mesh for 10 seconds. The fried chicken was cut into pieces, one of which was put in the bag, the opening was heat-sealed and sealed, and the bag was hung across the top and left to stand. After 3 hours, no oil seepage was seen on the bag surface, and even if fried chicken was added, excess oil could not seep into the bag inner surface and was observed to accumulate. Also, no dew condensation was observed on the inner surface of the bag, and it was clear that the water vapor emanating from the fried chicken immediately after the production ran outside through the air-permeable bag. Even after 3 hours, the fried chicken garment does not absorb moisture and becomes soft, it is brittle and has a crisp texture, has the texture of fried chicken immediately after production, and maintains favorable quality as a product I was

Example 3 A two-layer laminated type breathable oil-repellent paper having a basis weight of 60 g / m ² and used for a packaging bag for storing fried tempura was produced in the following manner.

The bleached softwood pulp is 430 Canadian freeness.
After refining to 0.5 ml CSF, sponge 557H was added to 0.5
% By weight (solid content / solid content) to obtain a first papermaking raw material.

Next, as a second papermaking raw material, a core-sheath type thermoplastic composite fiber of ethylene vinyl acetate copolymer and polypropylene (trade name: NBF fiber E type, manufactured by Daiwa Spinning Co., Ltd., hereinafter abbreviated as NBF-E) ) 60% by weight and Canadian freeness 43
Softwood bleached pulp 40% by weight beaten to 0ml CSF
And a mixture of the two were prepared.

The above two types of papermaking raw materials were introduced into individual cylinder cylinders of a Yankee-type cylinder paper machine having two cylinder cylinders to produce a two-layer laminated paper having a basis weight of 58 g / m ^2. did. The non-heat-sealing layer formed from the first papermaking raw material has a basis weight of 35 g / m ² and an air permeability of 37 seconds / 100 c.
In c, the basis weight of the heat seal layer formed from the second papermaking raw material is 23 g / m ² , and the air permeability is 53500 ml / min.
Met.

Next, 1.45% by weight (solid content) of a fluorinated surfactant (trade name: Asahigard AG530, manufactured by Asahi Glass Co., Ltd.) was applied to the two-layer laminated paper using a roll coater, and an acrylic emulsion was used. Type adhesive (Rohm & Haas Japan Co., Ltd., product name Primal P
376) is applied at ² g / m ² with an oil-repellent treatment liquid consisting of 5% by weight (solid content) and 93.55% by weight of water, and the total basis weight is 60 g.
/ M ² .

The thus obtained sheet-like material having a two-layer structure of a non-heat-sealing layer composed of wood pulp on one side and a heat-sealing layer composed of air-permeable synthetic fiber and wood pulp on the other side is subjected to air permeability. , Oil resistance, interlayer strength, heat seal strength, wet tensile strength, oil leakage and the like were measured. The results are shown in Table 1.

The sheet material had an air permeability of 97 seconds / 100c.
c, The non-heat-sealed surface had an oil resistance of 12, had no leakage of tempura oil at 100 ° C, and had sufficient air permeability and oil resistance. Since the thermoplastic conjugate fibers of the heat seal layer were firmly bonded by the acrylic emulsion type adhesive, the fibers did not fall off, fluff, etc.
The surface strength was higher than that obtained by melting and fusing thermoplastic conjugate fibers by the pressure and heat treatment shown in (1). Further, the bonding strength between the heat seal layer and the non-heat seal layer was also reinforced by the adhesive, so that delamination was difficult. In addition, since it was not subjected to the heat treatment under pressure, it was thick and stiff, had rigidity when formed into a bag, and was easy to insert contents and heat-seal, and was easy to handle.

After a pattern was gravure-printed on the non-heat-sealing layer of the sheet material, it was heat-sealed by an automatic bag making machine to produce a gusset bag (folded bag) having a length of 25 cm and a width of 27 cm. Sprinkle with a mixture of 300 parts by weight of tempura flour (manufactured by Nisshin Flour Milling Co., Ltd.) and 180 parts by weight of water, and put in tempura oil (manufactured by Nisshin Seifun Co., Ltd.) at 180 ° C. for 2 minutes. Then, one piece of tempura, which was taken out and drained on a wire mesh for 10 seconds, was put into the bag, the inlet was heat-sealed and hermetically sealed, and the bag was hung with its upper end sandwiched and left to stand. 3
After a time, no oil seeping out was seen on the bag surface, and even if tempura was added, excess tempura oil could not be soaked into the bag inner surface and accumulated. Also, no dew condensation was observed on the inner surface of the bag, and it was clear that the water vapor emanating from the tempura immediately after the frying was escaping to the outside through the air-permeable bag. After 3 hours, the tempura garment does not absorb moisture and becomes soft, it is brittle, has a crisp texture, has the texture of tempura immediately after being fried, and maintains favorable quality as a product. Was.

Example 4 A two-layer laminated type breathable oil-repellent paper having a basis weight of 60 g / m ² and used for a fried chicken packaging bag was produced as follows.

The bleached softwood pulp is 400 Canadian freeness.
After beating to a ml CSF, sponge 557H was added to 0.2 ml
5% by weight (solid content / solid content) was added to obtain a first papermaking raw material.

Next, as a second papermaking material, polypropylene short fiber (trade name: PP-TG fiber, manufactured by Chisso Corporation)
55% by weight of PP fiber, 5% by weight of fibrous polyvinyl alcohol (VPB105-2, Kuraray Co., Ltd., hereinafter referred to as fibrous binder), and softwood bleached pulp 40 beaten to CSF of 650 ml CSF.
%, And 0.1% by weight (solid content / solid content) of sponge 557H was prepared.

The above two kinds of papermaking raw materials are introduced into individual cylinders of a Yankee type cylinder paper machine having two cylinder cylinders to produce a two-layer laminated paper having a basis weight of 57 g / m ^2. did. The basis weight of the non-heat-sealing layer formed from the first papermaking raw material is 34 g / m ² , and the air permeability is 52 seconds / 100 cc.
The basis weight of the heat seal layer formed from the second papermaking raw material was 23 g / m ² , and the air permeability was 46400 ml / min.

Next, a fluorine-based surfactant (manufactured by Sumitomo 3M Limited, trade name: Scotchban Paper Protector FC) was applied to the two-layer laminated paper using a roll coater.
-807, hereinafter abbreviated as FC-807) 1.16% by weight
(Solid content), 3 g of an oil-repellent treatment liquid comprising 4% by weight (solid content) of polyvinyl alcohol (trade name: Gohsenol NH-17Q manufactured by Nippon Gosei Co., Ltd.) and 94.84% by weight of water
/ M ² to give a total basis weight of 60 g / m ² .

[0091] Thus non heat seal layer obtained one side made of wood pulp, the other side is the sheet having a two-layer structure of Ruhi Toshiru layer such synthetic fibers and wood pulp having a breathable, permeable Table 1 shows the results of measurement of airiness, oil resistance, interlayer strength, heat seal strength, wet tensile strength, oil leakage, and the like.

The sheet material had an air permeability of 139 seconds / 100.
cc, the oil resistance of the non-heat-sealing surface was 12, the tempura oil at 100 ° C did not leak, and the sample had sufficient air permeability and oil resistance. Since the polypropylene fibers of the heat seal layer were reinforced by polyvinyl alcohol, they had high strength and were difficult to delaminate. The heat seal strength and wet tensile strength were sufficient for practical use. In addition, since it was not subjected to the heat treatment under pressure, it was thick and stiff, had rigidity when formed into a bag, and was easy to insert contents and heat-seal, and was easy to handle.

[0093] After a pattern was gravure-printed on the non-heat-sealing layer of the sheet-like material, it was heat-sealed by an automatic bag-making machine to produce a gusset bag (folded bag) having a length of 25 cm and a width of 27 cm. The frozen frozen meat (produced by Nippon Ham Co., Ltd.) for fried chicken was put into 180 ° C. tempura oil (produced by Nisshin Oil Co., Ltd.) for 3 minutes, then taken out, and the oil was removed on a wire mesh for 10 seconds. The fried chicken was cut into pieces, one of which was put in the bag, the opening was heat-sealed and sealed, and the bag was hung across the top and left to stand. After 3 hours, no oil seepage was seen on the bag surface, and even if fried chicken was added, excess oil could not seep into the bag inner surface and was observed to accumulate. Also, no dew condensation was observed on the inner surface of the bag, and it was clear that the water vapor emanating from the fried chicken immediately after the production ran outside through the air-permeable bag. Even after 3 hours, the fried chicken garment does not absorb moisture and becomes soft, it is brittle and has a crisp texture, has the texture of fried chicken immediately after production, and maintains favorable quality as a product I was

Experimental Example In order to examine the relationship between the air permeability of the non-heat-sealing layer and the oil repellency and oil barrier properties after the oil repelling treatment, seven types of breathable oil-repellent papers were prepared by hand plucking.

The bleached softwood pulp has a Canadian freeness of 72.
0, 550, 504, 450, 280, 250, 180
After beating to a ml CSF, sponge 557H was added to 0.2 ml
5% by weight (solid content / solid content) was added to obtain a first papermaking raw material, respectively.

Next, as a second papermaking raw material, a core-sheath type thermoplastic composite fiber (manufactured by Daiwa Spinning Co., Ltd.) comprising an ethylene-vinyl acetate copolymer and polypropylene in a weight ratio of 1: 1.
After blending 50% by weight of brand name NBF fiber type E (hereinafter abbreviated as NBF-E) and 50% by weight of bleached softwood pulp beaten to a Canadian freeness of 500 ml CSF, sponge 55
What added 0.125 weight% (solid content / solid content) of 7H was prepared. The low melting point component of the thermoplastic fiber is an ethylene vinyl acetate copolymer, the high melting point component is polypropylene, and the proportion of the high melting point component in the entire thermoplastic fiber is 50% by weight.

A non-heat-sealing layer having a basis weight of 35 g / m ² was hand-washed from the first paper-making material using a hand-making paper machine.
A heat sealing layer having a basis weight of 20 g / m ² is hand-pulverized from the second papermaking raw material, and then combined in the form of a wet paper, and a basis weight of 55 g / m 2
It was prepared a two-layer combination papers ^2.

With respect to seven types of two-layer laminated paper having different degrees of beating of wood pulp and consequently different air permeability of the non-heat-sealing layer, oil repellency was applied to the joining base paper and the joining base paper in the same manner as in Example 1. A gas-permeable oil-repellent paper A that has been subjected to a heat treatment and a pressure and heat treatment, and a gas-permeable oil-repellent paper B that has been subjected to an adhesive impregnation and an oil repellency treatment on the bonded base paper in the same manner as in Example 3 are produced. , Air permeability, oil resistance and oil leakage were measured and are shown in Table 2.

From the results in Table 2, it can be seen that the air permeability and barrier property of the oil-repellent paper of the present invention for preventing the transmission of oils and fats are greatly affected by the air permeability of the non-heat-sealing layer. Is less than 20 seconds / 100 cc, as shown in the oil-repellent papers A and B, no matter which oil-repellent treatment is applied, there is leakage of oil and fat, and no barrier property is exhibited. On the other hand, the air permeability of the entire breathable oil-repellent paper is 500 seconds / 100 cc.
If the temperature exceeds the limit, the permeability of water vapor will be low, so if the fried tempura is sealed in a bag, the humidity inside the bag will become extremely high, and dew condensation will occur on the inner surface. Since it is excessively soft and has no crisp texture, the commercial value is significantly impaired.

Example 5 A second papermaking raw material was prepared using rayon staple fiber (Corona SB , trade name , manufactured by Daiwa Boseki Co., Ltd.) instead of bleached softwood pulp in the second papermaking raw material of Example 1. Example 1
In the same manner as in the above, a two-layer laminated breathable oil-repellent paper having a basis weight of 60 g / m ² was produced.

In the obtained air-permeable oil-repellent paper, the non-heat-sealing layer formed from the first papermaking raw material had a basis weight of 35 g / gram.
m ² , air permeability 26 sec / 100 cc, and the basis weight of the heat seal layer formed from the second papermaking raw material was 24.5 g /
m ² , air permeability was 32200 ml / min, and the amount of fluorine surfactant adhering was 0.5 g / m ² . The air permeability of the entire sheet was 107 seconds / 100 cc, the oil resistance of the non-heat-sealing layer was 12, there was no leakage of tempura oil at 100 ° C., and the sheet had sufficient air permeability and oil resistance.

In the same manner as in Example 1, fried tempura was put in a gusset bag and heat-sealed.
After a time, no oil seeping out was seen on the bag surface, and even if tempura was added, excess tempura oil could not be soaked into the bag inner surface and accumulated. Also, no dew condensation was observed on the inner surface of the bag, and it was clear that the water vapor emanating from the tempura immediately after the frying was escaping to the outside through the air-permeable bag. After 3 hours, the tempura garment does not absorb moisture and becomes soft, it is brittle and has a crisp texture. Was.

[0103] The polyethylene paper of Comparative Example 1 basis weight 50g / m ² 17g / m ² to prepare an extrusion laminated sheet exhibited this characteristic in Table 1.

Using this sheet, a gusset bag was prepared in the same manner as in Example 1, and a packaging test of tempura was carried out. As a result, about 30 minutes after enclosing the tempura, the tempura oil was passed through a pinhole in the polypropylene laminate layer. However, the function of the packaging material was incomplete because it leaked out of the bag and prevented leakage of the contents. Three hours later, significant condensation was observed inside the bag, and the balance of the tempura was excessively soft, so that the clothing was excessively soft and had no crisp texture, thereby significantly impairing the commercial value.

Comparative Example 2 Using the same raw materials as in Example 2, a two-layer laminated type breathable oil-repellent paper having a very high permeability and a basis weight of 56 g / m ² was produced.

The bleached softwood pulp is 725 Canadian freeness.
After refining to 0.5 ml CSF, sponge 557H was added to 0.5
% By weight (solid content / solid content), and then 0.45 weight% (solid content / solid content) of a fluorine-based surfactant (Sumitomo Chemical Industries, Ltd., trade name: Sumireze Resin FP150) was added. the fluorocarbon surfactant fixing agent thereafter (Sumitomo Chemical Co., Ltd., trade name Sumirez resin F R -2
0.3% by weight of P) was added to obtain a first papermaking raw material.

Next, EA fiber 4 was used as a second papermaking raw material.
5% by weight, SWP 5% by weight, and Canadian freeness 725
After blending 50% by weight of softwood bleached pulp beaten to ml CSF, 0.25% by weight of sponge 557H (solids / solids) and 0.45% by weight of the fluorosurfactant (solids / solids) ), To which 0.3% by weight of the above fixing agent was added.

The above two types of papermaking raw materials were introduced into individual cylinder cylinders of a Yankee type cylinder paper machine having two cylinder cylinders to produce a two-layer laminated paper having a basis weight of 56 g / m ^2. did. The basis weight of the non-heat-sealing layer formed from the first papermaking raw material is 33 g / m ² , and the air permeability is 1015 ml / mi.
n, the basis weight of the heat seal layer formed from the second papermaking raw material was 23 g / m ² , and the air permeability was 27,800 ml / min.

The two-layer laminated paper thus obtained was continuously heated at a roll temperature of 145 ° C. and a pressure between rolls of 90 kg / c.
m, and the thermoplastic composite fiber and the thermoplastic multibranched fiber of the heat seal layer were melted and fused.

[0110] The thus obtained non heat seal layer on one side is made of wood pulp, the other side is the sheet having a two-layer structure of the heat seal layer ing of synthetic fibers and wood pulp having air permeability, performed Table 1 shows the results of measuring the characteristics in the same manner as in Example 2.

As can be seen from Table 1, the sheet-like material based on Comparative Example 2 has an air permeability of 424 ml / min, has extremely high air permeability, and has an oil resistance of 10 on the non-heat-sealed surface. Since the tempura oil easily leaks to the opposite side, the oil repellency was not enough to prevent the penetration of oils and fats. Next, as a result of conducting a packaging test of fried chicken using a gusset bag in the same manner as in Example 2, no dew condensation water was found inside the bag, and the fried chicken had good crunchiness and a crunchy texture. About 15 minutes after encapsulation, the oil leaked out of the bag, and the function of the packaging material to prevent leakage of the contents was extremely inadequate. Value has declined. On the other hand, 1 gram of butter (made by Snow Brand Milk Products Co., Ltd.) was placed in the above bag, placed on a plate, and a load of 100 g was placed on the bag, and a microwave oven (Model NE6360 manufactured by Matsushita Electric Industrial Co., Ltd., high frequency output) 60
(0 W) on the thaw menu for 1 minute. No exudation of the molten butter was observed after heating.

From the above results, the sheet-like material based on Comparative Example 2 has a short-time oil repellency to heated solid fats and oils.
Since the air permeability is high and the pore size of the through-hole is large, sufficient oil repellency is not exhibited so as to suppress the exudation of oil and fat on the opposite surface of the sheet. By comparing this comparative example with Example 2, the air permeability of the non-heat-sealing layer and the entire sheet is controlled to a predetermined range in order to obtain a material having both air permeability, oil repellency to oils and fats, and barrier properties. It turns out that it is necessary to

[0113]

[Table 1]

[0114]

[Table 2]

[0115]

According to the present invention, a packaging material having both oil repellency, air permeability, single-sided or double-sided heat sealability, water resistance and heat resistance required for packaging hot oily food can be obtained. A breathable oil-repellent paper suitable for use in packaging oily cooked foods such as fried food immediately after production is obtained. Furthermore, in the case of a breathable oil-repellent paper manufactured without passing through the pressure and heat treatment step, a bulky and stiff paper can be obtained, so that there is an effect that it is easy to handle at the time of packaging and production efficiency is improved. This also has the effect of reducing costs.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a two-layer breathable oil-repellent paper according to the present invention.

FIG. 2 is a partial cross-sectional view of a three-layer breathable oil-repellent paper according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Non-heat-sealing layer 2 Heat-sealing layer 3 Two-layer breathable oil-repellent paper 4 Three-layer breathable oil-repellent paper

Claims (4)

(57) [Claims] 1. A thermoplastic fiber comprising 30 to 90% by weight of a thermoplastic fiber composed of at least two or more kinds of synthetic resin components having different melting points and 70 to 10% by weight of a natural fiber for papermaking or a semi-synthetic fiber for papermaking. The low melting point component is melted and solidified, and the high melting point component of the thermoplastic fiber and the natural fiber for papermaking or the semi-synthetic fiber for papermaking are made of a gas-permeable heat-sealing layer that retains the fiber form, A non-heat-sealing layer having a porosity of 20 seconds / 100 cc or more and less than 500 seconds / 100 cc is joined by laminating, and the air permeability obtained by dispersing a fluorine-based surfactant is 50 seconds / 10.
A breathable oil-repellent paper having a non-heat-sealing layer side oil resistance of 10 or more at 0 cc to 500 sec / 100 cc. 2. A base paper having an air permeability of 5000 ml comprising 30 to 90% by weight of thermoplastic fibers composed of at least two or more kinds of synthetic resin components having different melting points and 70 to 10% by weight of natural fibers for papermaking or semisynthetic fibers for papermaking. / Min or more heat-sealing layer and natural permeability for papermaking
A non-heat-sealing layer of at least s / 100 cc or more and less than 500 s / 100 cc is joined by bonding to form a bonding paper, and a fluorine-based surfactant is internally added before the bonding and / or fluorine is added to the bonding paper. After the oil repellent treatment by impregnation with a surfactant, the bonded paper is heated and pressed at a temperature higher than the melting point of the low melting point component of the thermoplastic fiber and lower than the melting point of the high melting point component of the thermoplastic fiber. The air permeability is 5
A method for producing a breathable oil-repellent paper in which the non-heat-sealing layer side has an oil resistance of 10 or more at 0 sec / 100 cc to 500 sec / 100 cc or less. 3. A thermoplastic fiber comprising 30 to 90% by weight of a thermoplastic fiber and 70 to 10% by weight of a natural fiber for papermaking or a semi-synthetic fiber for papermaking, wherein the thermoplastic fiber and the natural fiber for papermaking or the semi-synthetic fiber for papermaking are in fiber form. Air-permeable 20 seconds / 100 cc made of natural fiber for paper making
The non-heat-sealing layer of less than 500 seconds / 100 cc is joined by laminating, and the air permeability obtained by dispersing the adhesive and the fluorine-based surfactant is 50 seconds / 100.
A breathable oil-repellent paper having a non-heat-sealing layer side oil resistance of 10 or more at cc to 500 sec / 100 cc. 4. A heat seal layer comprising 30 to 90% by weight of a thermoplastic fiber and 70 to 10% by weight of a natural fiber for papermaking or a semi-synthetic fiber for papermaking and having a base paper air permeability of 5000 ml / min or more, and a natural fiber for papermaking. Air permeability of 20 seconds / 10
A non-heat-sealing layer of 0 cc or more and less than 500 seconds / less than 100 cc is joined together by bonding to form a bonded paper, and the bonded paper is impregnated with an adhesive and impregnated with a fluorine-based surfactant to thereby provide oil repellency. A method for producing a breathable oil-repellent paper having an air permeability of 50 seconds / 100 cc to 500 seconds / 100 cc and an oil resistance of 10 or more on the non-heat-sealing layer side.