JP2018168331A - Resin film, laminate and packaging material - Google Patents

Abstract

To provide a resin film which can be quickly taken out even when a content is rich in oil content when formed into a packaging material, and can prevent adhesion and remaining of the content in the packaging material.SOLUTION: A resin film has a plurality of projections which extend in a zigzag form on at least one surface, where a cross-sectional shape of the projections is a substantially trapezoidal shape.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a resin film. More specifically, the present invention relates to a resin film capable of exhibiting excellent content sliding properties and content adhesion / remaining prevention properties when subjected to surface treatment and used as a packaging material, and a laminate and a packaging material using the resin film. .

  In many product fields such as food, beverages, pharmaceuticals, and chemicals, packaging materials corresponding to their contents have been developed. In particular, a plastic material excellent in water resistance, oil resistance, gas barrier properties, light weight, flexibility, design, etc. is used as a packaging material for filling contents having viscous bodies such as liquid, semi-solid, and gel substances. Used and functions to protect the contents required for packaging materials.

As one of the functions of the packaging material, there is a demand for content slipping property that allows the contents to be taken out quickly in a shorter time.
In addition, there is a demand for content adhesion / residue prevention that can prevent the content from adhering to and remaining on the inner surface of the packaging material.
In particular, oil-rich and highly viscous contents adhere to the inside of the packaging material and are difficult to remove in a short time, or adhere to the inside of the packaging material and remain. Although the contents finally remaining in the packaging material are discarded together with the packaging material, the disposal of the contents is regarded as a problem from the environmental viewpoint.

  For such a problem, for example, in a film packaging material, it has been proposed to improve the releasability between the contents and the laminated film by applying a fluorine-based material on the sealant side (Patent Document 1). See). In addition, it has been proposed to provide a heat seal resin layer containing hydrophobic fine particles such as silicone particles on one side of a substrate (see Patent Document 2).

Japanese Patent No. 3623540 JP 2013-18533 A

However, when a fluorine-based material as proposed in Patent Document 1 is applied, there is a problem that the heat sealability required when producing a packaging material is insufficient.
Further, when a layer containing fine particles or the like is provided on the inner surface of the packaging material as proposed in Patent Document 2, there is a risk that the fine particles may fall off and be mixed into the contents during storage. It was.

  The present invention has been made in view of the above problems, and its purpose is to provide a packaging material by applying surface treatment to the film surface without adding modifiers such as fine particles and a lubricant component. An object of the present invention is to provide a resin film that can be quickly taken out even if the content is rich in oil, and that can suppress the adhesion / remaining of the content in the packaging material.

  The resin film of the present invention is characterized in that it has a plurality of ridges extending in a zigzag shape on at least one surface, and the cross-sectional shape of the ridges is substantially trapezoidal.

  In the said aspect, it is preferable that the cross-sectional shape of a protruding item | line part is a substantially trapezoid which has the upper side of 10 micrometers or more and 100 micrometers or less, and the lower side of 50 micrometers or more and 200 micrometers.

  In the said aspect, it is preferable that ratio (height / distance of an adjacent convex line part) of the height of a convex line part and the distance of an adjacent convex line part is 0.01 or more and 0.1 or less. .

  In the said aspect, it is preferable that the height of a protruding item | line part is 3 micrometers or more and 100 micrometers or less.

  In the said aspect, it is preferable that the width | variety of a protruding item | line part is 10 micrometers or more and 100 micrometers or less.

  In the above aspect, the shortest distance between the line extending the hypotenuse forming the peak and the line extending the hypotenuse forming the peak at the nearest peak and valley of the adjacent zigzag ridges is 50 μm. The thickness is preferably 5000 μm or less.

  It is preferable that the angle formed by the two oblique sides forming the peaks or valleys in the zigzag ridge is 30 ° or more and 170 ° or less.

  The laminate of the present invention comprises a substrate and a layer made of the above resin film, and the surface having the ridges or ridges of the layer made of the resin film is the outermost surface.

  The packaging material of the present invention is made of the above-mentioned resin film, has an opening for accommodating the contents, and the surface of the resin film having a protruding portion or a recessed portion extending in a zigzag shape is located inside the packaging material. It is characterized by that.

  The packaging material of the present invention is made of the above laminate, has an opening for accommodating the contents, and a surface having a ridge or recess extending in a zigzag shape in a layer made of a resin film of the laminate is packaged. It is located inside the material.

  In the said aspect, it is preferable that a protruding item | line part extends in zigzag shape in a parallel direction with respect to opening of a packaging material.

  ADVANTAGE OF THE INVENTION According to this invention, the resin film which has high content sliding-off property and content adhesion and residual prevention property, and a laminated body and packaging material using the same are provided.

FIG. 1 a is a front view showing a resin film of the present invention in one embodiment. FIG. 1 b shows a cross-sectional view of the resin film of FIG. FIG. 2 is a front view showing the resin film of the present invention in one embodiment. FIG. 3 is a perspective view showing the resin film of the present invention in one embodiment. FIG. 4 is a schematic cross-sectional view showing an embodiment of the method for producing a resin film of the present invention. FIG. 5 is a schematic cross-sectional view showing an embodiment of the method for producing a resin film of the present invention. FIG. 6 is a schematic cross-sectional view showing the laminate of the present invention in one embodiment. FIG. 7 is a front view showing the packaging material of the present invention in one embodiment. FIG. 8 is a front view showing the packaging material of the present invention in one embodiment. FIG. 9 is a front view showing the package of the present invention in one embodiment. FIG. 10 is a perspective view of a sliding property evaluation apparatus used for evaluating the sliding property of the packaging material of the present invention. FIG. 11: is a front view showing the shaping shape of the chill roll surface with which the film forming machine used in Examples 1-4 and Comparative Examples 2-4 is equipped.

(Resin film)
As shown in FIG. 1, the resin film 10 of the present invention has a plurality of ridges 11 extending in a zigzag shape, and the cross-sectional shape of the ridges is substantially trapezoidal.
When the resin film has such a structure, when it is used as a packaging material such as a packaging bag or a packaging container, the content, particularly the content rich in oil can be quickly slid down. Furthermore, it is possible to prevent the contents from adhering and remaining.
This is because the resin film has a plurality of ridges extending in a zigzag shape on the surface, so that the contact area between the contents and the resin film is reduced. Therefore, a gap is generated between the contents and the resin film, and oil content oozes out of the contents in the gap, and an oil film is formed between the contents and the resin film. This is because the oil film can move so as to slide on the oil film.
In particular, in the present invention, for example, since a plurality of ridges having a substantially trapezoidal cross-sectional shape extend in a zigzag shape, it is considered that oil accumulates and an oil film is easily formed.
In the present invention, the “zigzag shape” is a shape in which peaks and valleys are alternately repeated, and includes not only a letter shape as shown in FIG. 1 but also a Z letter shape. From the viewpoint of sliding off of the contents and prevention of remaining, it is preferably a dogleg shape.

As shown in FIG. 1, in the case where the ridge portion is a dogleg shape, the length L of the hypotenuse forming the peak or valley is preferably 30 μm or more and 200 μm or less, and 40 μm or more and 100 μm or less. More preferably, it is more preferable.
Thereby, content sliding-off property and content adhesion / residual prevention property can be further improved.
At this time, the angle δ formed by the two oblique sides forming the peaks or valleys in the ridge is preferably 30 ° or more and 170 ° or less, and 40 ° or more and 160 ° or less. Is more preferable.
As a result, the content slipping property and the content adhesion / residual prevention property can be further improved.

  In one embodiment, as shown in FIG. 1, the ridges 11 may extend zigzag from end to end of the resin film 10, and intermittently extend as shown in FIG. 2. There may be.

In the resin film, it is preferable that the plurality of ridges are provided at regular intervals, that is, so as to extend parallel to each other.
As shown in FIG. 1, the distance H between adjacent zigzag ridges 11a and 11b is preferably 50 μm or more and 3000 μm or less, and more preferably 100 μm or more and 2000 μm or less.
Thereby, content sliding-off property and content adhesion / residual prevention property can be further improved.
In the present invention, the distance H between adjacent ridges means the distance between the midpoints of the widths of the ridges as shown in FIG.

As shown in FIG.1 (b), the cross-sectional shape of the protruding item | line part with which the resin film 10 of this invention is provided is a substantially trapezoid.
More preferably, the cross-sectional shape of the ridge is a substantially trapezoid having an upper side of 10 μm or more and 100 μm or less and a lower side of 50 μm or more and 200 μm, and more preferably an upper side of 40 μm or more and 80 μm or less and 80 μm or more and 150 μm. It is a substantially trapezoid having the following lower side.
By making the cross-sectional shape of the ridge portion into a substantially trapezoidal shape having an upper side and a lower side in the numerical range described above, the content slipping property and the content adhesion / remaining prevention property can be further improved.

The height α of the ridge is preferably 3 μm or more and 100 μm or less, more preferably 5 μm or more and 100 μm or less, and further preferably 5 μm or more and 80 μm or less.
By setting the height α of the ridges in the above numerical range, it is possible to further improve the content slipping property and the content adhesion / residual prevention property.
In the present invention, the height α of the ridges on the surface of the resin film refers to the length from the lowest point to the highest point in the resin film, as shown in FIG.

Also, as shown in FIGS. 3 and 4, in the nearest peaks and valleys of adjacent zigzag ridges, a line extending the hypotenuse forming the valley and a line extending the hypotenuse forming the peak Is preferably 50 μm or more and 5000 μm or less, more preferably 200 μm or more and 1000 μm or less, and further preferably 200 μm or more and 800 μm or less.
Thereby, content sliding-off property and content adhesion / residual prevention property can be further improved.

The ratio between the height α of the ridges and the distance H between adjacent ridges (height α / distance H between adjacent ridges) is preferably 0.01 or more and 0.1 or less. 0.02 or more and 0.1 or less is more preferable, and 0.03 or more and 0.07 or less is more preferable.
As a result, the content slipping property and the content adhesion / residual prevention property can be further improved.

  In the present invention, the height α, pitch γ, and the like of the protrusions on the surface of the resin film can be measured by using, for example, Surfcom 1400G (trade name) manufactured by Tokyo Seimitsu Co., Ltd.

The resin film according to the present invention can comprise a thermoplastic resin. When the resin film contains a thermoplastic resin, heat sealability can be imparted to the resin film.
The content of the thermoplastic resin in the resin film is preferably 50% by mass or more and 100% or less, and more preferably 70% by mass or more and 100% by mass or less. By making content of the thermoplastic resin in a resin film into the said numerical range, the heat seal property of a resin film can be improved more.

Examples of the thermoplastic resin include polyolefin resins such as polyethylene and polypropylene, polystyrene, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol, ethylene / vinyl alcohol copolymer, polyacrylonitrile, polyamide, acrylate ester, and methacrylate ester. Acrylic resin having a main component, polyethylene terephthalate, polybutylene terephthalate, polyester such as polyethylene naphthalate, polyacetal and the like. These materials can be used alone or in combination.
In the present invention, it is preferable to use a polyolefin-based resin as the thermoplastic resin, and polypropylene is more preferable from the viewpoint of heat resistance.

  The resin film may contain (meth) acrylic acid ester, epoxy resin, polyurethane resin, polyester resin and the like in addition to the thermoplastic resin.

  The resin film may contain various additives as long as the characteristics are not impaired. Examples of additives include plasticizers, UV stabilizers, anti-coloring agents, matting agents, deodorants, flame retardants, weathering agents, antistatic agents, yarn friction reducing agents, slip agents, mold release agents, An oxidizing agent, an ion exchange agent, a coloring pigment, and the like can be added.

Although the thickness of a resin film is not specifically limited, For example, it can be 50 micrometers or more and 100 micrometers or less.
In the present invention, the thickness of the resin film refers to the thickness including the ridges.

(Method for producing resin film)
In one embodiment, the resin film of the present invention is obtained by heating and melting a mixture containing the above-described thermoplastic resin and extruding it into a sheet, and then extruding the mixture extruded into a sheet into a zigzag shape on the surface. It can be manufactured by pressure molding using a molding roll having a plurality of concave strips.

More specifically, as shown in FIG. 4, first, the heated and melted mixture 20 is extruded from the T die 21, and then a plurality of concave strips having a substantially trapezoidal cross section extending in a zigzag shape on the surface are formed. It can be produced by passing between the chill roll 22 and the nip roll 23 and press-molding at this time.
In the present embodiment, the chill roll 22 corresponds to a forming roll having a plurality of concave portions extending in a zigzag shape on the surface. According to this method, a plurality of zigzag ridges can be formed on the surface of the resin film at the molding point 25 simultaneously with the molding of the resin film 14. The resin film 24 is peeled from the chill roll 22 at the peeling point 26. In addition, you may cool the resin film after shaping | molding with 1 or 2 or more cooling rolls.

Further, as shown in FIG. 5, the resin film is formed by extruding the mixture 20 heated and melted from the T-die 21 and then blowing the air from the air knife device 27 to form a zigzag-shaped groove on the surface. It can be obtained by pressing against a chill roll 22 having a plurality of parts.
Moreover, you may cool the resin film after shaping | molding using a 1 or 2 or more cooling roll.

  The temperature at which the mixture is melted by heating is preferably 100 ° C. or higher and 400 ° C. or lower, more preferably 120 ° C. or higher and 350 ° C. or lower.

When the concave portion on the surface of the forming roll is a dogleg shape, the length L ′ of the hypotenuse forming the peak or valley is preferably 30 μm or more and 200 μm or less, and 40 μm or more and 100 μm or less. Is more preferable.
At this time, the angle δ ′ formed by the two oblique sides forming the peaks or valleys in the concave strip is preferably 30 ° or more and 170 ° or less, and is 40 ° or more and 160 ° or less. It is more preferable.

In the forming roll, it is preferable that the plurality of concave portions are provided at regular intervals, that is, so as to extend parallel to each other.
The distance H ′ between adjacent zigzag concave ridges is preferably 50 μm or more and 3000 μm or less, and more preferably 100 μm or more and 2000 μm or less.
It is more preferable that

The concave strip provided in the forming roll has a substantially trapezoidal cross-sectional shape.
More preferably, the cross-sectional shape of the recess is a substantially trapezoid having an upper side of 50 μm or more and 200 μm and a lower side of 10 μm or more and 100 μm or less,
More preferably, the cross-sectional shape of the protrusion is a substantially trapezoid having an upper side of 80 μm or more and 150 μm or less and a lower side of 40 μm or more and 80 μm or less.

  The depth α ′ of the groove on the surface of the forming roll is preferably 3 μm or more and 100 μm or less, more preferably 5 μm or more and 100 μm or less, and further preferably 5 μm or more and 80 μm or less.

  The shortest distance γ ′ between the line extending the hypotenuse forming the valley and the line extending the hypotenuse forming the peak at the nearest peaks and valleys of the adjacent zigzag concave stripes is 50 μm or more and 5000 μm. Is preferably 200 μm or more and 1000 μm or less, more preferably 200 μm or more and 800 μm or less.

  The ratio (height α ′ / distance H ′ of adjacent ridges) between the height α ′ of the ridges and the distance H ′ between adjacent ridges is 0.01 or more and 0.1 or less. Preferably, it is 0.02 or more and 0.1 or less, more preferably 0.03 or more and 0.07 or less.

  In one embodiment, the resin film of the present invention is produced by extruding a mixture comprising the above-described thermoplastic resin and the like, and a zigzag-shaped concave portion on the surface of the film. It can manufacture also by embossing using the embossing roll which has two or more.

(Laminate)
The laminate according to the present invention includes a layer made of the above-described resin film and a base material, and the surface having the protruding portion of the resin film is the outermost surface.
This laminate may further have a barrier layer between the layer made of the resin film and the substrate, and may further include other layers such as a thermoplastic resin layer.

  The structure of the laminated body of this invention in one Embodiment is demonstrated referring FIG. According to the aspect of the present invention, there is provided a laminate 30 including a base material 31, a barrier layer 32, a thermoplastic resin layer 33, and a layer 34 made of the resin film of the present invention in this order.

(Base material)
Although it does not specifically limit as a base material which comprises the laminated body by this invention, It can produce using resin which has a moldability. For example, low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, ethylene-vinyl acetate copolymer resin, ionomer resin, ethylene-acrylic acid copolymer resin, ethylene-ethyl acrylate copolymer Copolymer resin, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, methylpentene resin, polybutene resin, acid-modified polyolefin resin, polyamide resin, polystyrene resin, low crystalline saturated polyester or amorphous It can be formed using a polyester resin or the like. Of these, polyester resins, polybutylene terephthalate resins, polyethylene naphthalate resins, particularly polyethylene terephthalate (PET) resins are preferred because of good moldability.
When the base material is produced using the above-described resin, the thickness of the base material layer is not particularly limited, but from the viewpoint of moldability, a material of 5 μm to 20 μm is usually used. preferable.
In order to improve the adhesion between the base material and the heat-sealable resin film, the surface of the base material is subjected to surface activation treatment such as corona treatment, flame treatment, plasma treatment, or flame treatment. It is preferable to carry out.

In addition, as a base material, a paper base material can also be used. In addition to non-coated paper such as kraft paper, high-quality paper, single gloss kraft paper, pure white roll paper, glassine paper, cup base paper, synthesis without using natural pulp Paper or the like can be used.
As a paper base material, for example, a general-purpose fine coating printing paper, coated printing paper, resin-coated paper, processed base paper, release base paper, double-sided coat base paper, and the like, which are described later in advance, are formed. Commercially available products can also be used.

<Layer made of resin film>
The layer made of the resin film constituting the laminate according to the present invention is arranged as the outermost layer of the laminate so that the surface having the ridges of the resin film is located on the outermost surface. The configuration and the like of the resin film are as described above.

(Other layers)
The laminated body by this invention may be equipped with the other layer between the base material and the resin film. When two or more other layers are included, each may have the same composition or a different composition. Examples of other layers include a barrier layer, a thermoplastic resin layer, an adhesive layer, and a printed layer.

(Barrier layer)
The laminate according to the present invention can comprise a barrier layer.
This barrier layer is preferably made of an inorganic material or an inorganic oxide, and more preferably made of a vapor-deposited film of an inorganic material or an inorganic oxide or a metal foil.
A vapor deposition film can be formed by a conventionally known method using a conventionally known inorganic substance or inorganic oxide, and its composition and formation method are not particularly limited.
When the laminate has a barrier layer, the laminate can be given or improved gas barrier properties that prevent transmission of oxygen gas, water vapor, and the like, and light shielding properties that prevent transmission of visible light, ultraviolet rays, and the like. it can.
Note that the laminate may have two or more barrier layers. When two or more barrier layers are provided, each may have the same composition or a different composition.

Examples of the deposited film include silicon (Si), aluminum (Al), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), boron (B), and titanium (Ti). ), Lead (Pb), zirconium (Zr), yttrium (Y) and the like, or vapor-deposited films of these inorganic oxides can be used.
Particularly suitable for packaging materials (bags) and the like are aluminum metal vapor-deposited films, or silicon oxide or aluminum metal or aluminum oxide vapor-deposited films.

Representation of the inorganic oxide, for _example, SiO X, as such AlO _X MO _X (In the formula, M represents an inorganic element, the value of X, varies each of an inorganic element range.) In expressed. As a range of the value of X, silicon (Si) is 0 to 2, aluminum (Al) is 0 to 1.5, magnesium (Mg) is 0 to 1, calcium (Ca) is 0 to 1, 0 to 0.5 for potassium (K), 0 to 2 for tin (Sn), 0 to 0.5 for sodium (Na), 0 to 1,5 for boron (B), titanium (Ti) Can take values in the range of 0 to 2, lead (Pb) in the range of 0 to 1, zirconium (Zr) in the range of 0 to 2, and yttrium (Y) in the range of 0 to 1.5. In the above, when X = 0, it is a complete inorganic simple substance (pure substance) and is not transparent, and the upper limit of the range of X is a completely oxidized value. Silicon (Si) and aluminum (Al) are suitably used for the packaging material, silicon (Si) is in the range of 1.0 to 2.0, and aluminum (Al) is in the range of 0.5 to 1.5. Can be used.

In the present invention, the film thickness of the inorganic or inorganic oxide vapor-deposited film as described above varies depending on the type of inorganic or inorganic oxide used, but is, for example, about 50 to 2000 mm, preferably about 100 to 1000 mm. It is desirable to select and form arbitrarily within the range.
More specifically, in the case of an aluminum vapor deposition film, the film thickness is preferably about 50 to 600 mm, and in the range of 100 to 450 mm, and in the case of an aluminum oxide or silicon oxide vapor deposition film, the film thickness is 50 to 500 mm. The position of 100 to 300 mm is desirable.

  As a method for forming a vapor deposition film, for example, a physical vapor deposition method (Physical Vapor Deposition method, PVD method) such as a vacuum vapor deposition method, a sputtering method, and an ion plating method, or a plasma chemical vapor deposition method, a thermochemical method, or the like. Examples thereof include a chemical vapor deposition method (chemical vapor deposition method, CVD method) such as a vapor phase growth method and a photochemical vapor deposition method.

  According to another aspect, the barrier layer may be a metal foil obtained by rolling a metal. A conventionally known metal foil can be used as the metal foil. Aluminum foil or the like is preferable from the viewpoint of gas barrier properties that prevent the transmission of oxygen gas, water vapor, and the like, and light shielding properties that prevent the transmission of visible light, ultraviolet light, and the like.

(Thermoplastic resin layer)
The thermoplastic resin layer is composed of a low-density polyethylene resin, a medium-density polyethylene resin, a high-density polyethylene resin, a linear low-density polyethylene resin, a copolymer resin with ethylene-α olefin polymerized using a metallocene catalyst, ethylene- Polypropylene copolymer resin, ethylene-vinyl acetate copolymer resin, ethylene-acrylic acid copolymer resin, ethylene-ethyl acrylate copolymer resin, ethylene-methacrylic acid copolymer resin, ethylene-methyl methacrylate copolymer Resin obtained by graft polymerization or copolymerization of unsaturated carboxylic acid, unsaturated carboxylic acid, unsaturated carboxylic acid anhydride, ester monomer to coalescence resin, ethylene-maleic acid copolymer resin, ionomer resin, polyolefin resin , A resin obtained by graft-modifying maleic anhydride to a polyolefin resin, etc. It can become Nde. The thermoplastic resin layer may contain two or more of the above materials.

(Adhesive layer)
An adhesive layer is a layer formed in order to bond any 2 layers among the layers with which a laminated body is provided by a laminate, and is an adhesive layer or an adhesive resin layer.
As an adhesive for laminating, for example, one or two-component cured or non-cured vinyl type, (meth) acrylic type, polyamide type, polyester type, polyether type, polyurethane type, epoxy type, rubber type, Other adhesives such as solvent type, aqueous type, and emulsion type can be used.
Examples of the coating method for the adhesive include a direct gravure roll coating method, a gravure roll coating method, a kiss coating method, a reverse roll coating method, a fountain method, a transfer roll coating method, and other methods.
As the coating ^{amount, 0.1g / m 2 ~10g / m} 2 ( dry) are ^{preferred, 1g / m 2 ~5g / m} 2 ( dry state) position is more preferred. As the adhesive resin layer, for example, the thermoplastic resin described above is used.

(Print layer)
A printing layer is a layer provided in order to provide design properties, such as a character, information, a pattern, and a design, to a laminated body. The printing layer can be formed using a conventionally known pigment or dye colorant, and the formation method is not particularly limited. For example, titanium white, zinc white, petal, vermilion, ultramarine blue, cobalt blue titanium yellow, yellow lead, carbon black and other inorganic pigments, isoindolinone yellow, hansa yellow A, quinacridone red, permanent red 4R, phthalocyanine blue, indus Pearl pigments (pearl) made of organic pigments (including dyes) such as Lenblue RS and aniline black, metal pigments made of metal powders such as aluminum and brass, titanium dioxide-coated mica, and foil powders such as basic lead carbonate It can be formed with an ink using a colorant such as a pigment or a fluorescent pigment.

(Packaging material)
The packaging material of the present invention is composed of the above resin film or the above laminate, and has an opening for accommodating the contents, and a ridge extending in a zigzag shape of the resin film on the inner side (the contents side). A surface having a portion is located (see FIGS. 7 and 8).
When the packaging material has such a configuration, the contact area of the contents can be reduced, and the contents can be slid and the contents can be prevented from sticking and remaining.

  In the packaging material, even if the ridges located on the inner surface extend in a zigzag shape in a direction parallel to the opening as shown in FIG. 7, they are perpendicular to the opening as shown in FIG. Although it may extend in a direction, it is more preferable that it extends in a direction parallel to the opening from the viewpoint of the sliding property of the contents and the remaining prevention function.

  In one embodiment, a packaging material can be produced by stacking and heat-sealing the peripheral edges so that the zigzag-shaped surfaces of the laminated resin film in the laminated body face each other. . In one embodiment, the packaging material may be a self-supporting packaging material (standing pouch).

  The heat sealing method is not particularly limited, and known methods such as a bar seal, a rotary roll seal, a belt seal, an impulse seal, a high frequency seal, and an ultrasonic seal can be used.

(Packaging body)
The package of the present invention can be produced by filling the contents from the opening of the packaging material described above and heat-sealing the opening.

  As shown in FIG. 9, you may have the cutting line 51 for forming the opening for taking out the contents, and you may have the notch 52 which is a cut for opening.

  The content to be filled in the package is not particularly limited, but is preferably rich in oil. Specific examples include kaisenbetsu, curry and stew.

(Sliding property evaluation method for packaging materials)
In the present invention, the content slipping property and the content adhesion / remaining prevention performance of the packaging material 40 can be measured by using a slipping property evaluation apparatus 60 shown in FIG. According to this apparatus, the inclination speed, inclination angle, and the like of the packaging material 40 can be fixed, and the content slipping property and the content adhesion / residual prevention performance of the packaging material 40 can be more accurately evaluated.
As shown in FIG. 11, the slipperiness evaluation device 60 rotates the frame 62 including the holding portion 61 that can hold the packaging material 40 around the rotation shaft 63 to rotate the holding portion 61 and the packaging material 40. The contents can be slid down from the packaging material.
More specifically, a string with a weight 64 tied to one end (lower end) of the frame 62 is attached, and the weight 64 is dropped through the fulcrum X.
Accordingly, the holding portion 61 and the packaging material 40 can be rotated around the rotation shaft 63, and the one end of the frame 62 is lifted, so that the holding portion 61 and the packaging material 40 can be inclined. it can.
The inclination angle of the holding part 61 and the packaging material 40 can be controlled by providing a stopper 65 such as a bar that contacts the rotating holding part 61 and the packaging material and can stop the rotation.
The weight of the contents sliding down from the packaging material 40 can be measured by the sliding contents weight measuring unit 66 arranged in advance at the dropping point. The measuring unit may be capable of measuring weight over time.

  EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, this invention is not limited to these Examples.

Example 1
<Production of resin film>
First, a film forming machine provided with a T die and a chill roll was prepared. The surface of the chill roll was shaped, and had a concave portion extending in a zigzag shape in a direction parallel to the film feeding direction as shown in FIG.
This concave portion has a square shape, the length L ′ of the hypotenuse forming the peak and valley is 60 μm, and the angle δ formed by the two hypotenuses forming the peak and valley is 160 °. It was.
Further, the plurality of concave portions extended in parallel at a constant interval of a distance H ′ of 200 μm.
Moreover, the cross-sectional shape of the concave stripe part was substantially trapezoidal, the length of the upper side was 80 μm, and the length of the lower side was 50 μm.
In addition, the depth α ′ of the concave stripe portion is 7 μm, and in the nearest peaks and valleys of adjacent zigzag concave stripe portions, a line extending the hypotenuse forming the valley and the hypotenuse forming the peak The shortest distance γ ′ with a line extending from is 200 μm.
Furthermore, the ratio (depth α ′ / distance H ′ between adjacent groove portions) between the depth α ′ of the groove portion and the distance H ′ between adjacent groove portions was 0.035.

Subsequently, a polypropylene resin (manufactured by Novatec, trade name: FW4BT) was extruded onto a chill roll at a die temperature of 280 ° C. to form a resin film having a thickness of 80 μm (nip pressure: 3 kg / cm ² ).
On the surface of the obtained resin film, a plurality of ridges extending in a zigzag shape as shown in FIG. 1 were formed (shaping rate of 95%).
This ridge portion was a dogleg shape, the length L of the hypotenuse forming the peak and valley was 60 μm, and the angle δ formed by the two hypotenuses forming the peak and valley was 160 °. .
The plurality of ridges extended in parallel at a constant interval of a distance H of 200 μm.
Moreover, the cross-sectional shape of the protruding portion was substantially trapezoidal, the length of the upper side was 50 μm, and the length of the lower side was 80 μm.
In addition, the height α of the ridge is 7 μm, and the line that extends the hypotenuse that forms the valley and the hypotenuse that forms the ridge in the nearest peaks and valleys of the adjacent zigzag ridges. The shortest distance γ with the extended line was 200 μm.
Furthermore, the ratio (height α / distance H between adjacent ridges) between the height α of the ridges and the distance H between the adjacent ridges was 0.035.

<Production of laminate>
The resin film obtained as described above is dry-laminated via a 12 μm-thick PET film and a two-component curable urethane-based adhesive so that the surface having the ridges is the outermost surface, A laminate was produced.

<Production of packaging materials>
Two pieces of the obtained laminate are cut into a size of 170 mm × 130 mm, the surfaces of the resin film on which the ridges are formed face each other, and the ridges extend zigzag in a direction parallel to the opening. This was placed and thermocompression bonded (conditions: 210 ° C., 1 kg / cm ² , 1 second) with a length of 2 mm and a width of 1 mm with a width of 10 mm to obtain a packaging material.

(Examples 2-5 and Comparative Examples 1-4)
The depth α ′ and width β ′ of the concave portion on the surface of the chill roll, the line extending the hypotenuse forming the valley and the hypotenuse forming the mountain at the nearest peak and valley of the adjacent zigzag concave step The ratio of the shortest distance γ ′ to the line extending from the line, the depth α ′ of the groove portion, and the distance H ′ of the adjacent groove portion, and a resin film having a protrusion portion shown in Table 1 A packaging material was produced in the same manner as in Example 1 except that.
In Example 5, a packaging material was produced in the same manner as in Example 1 except that the ridges were arranged so as to extend in a zigzag direction perpendicular to the opening.
In Comparative Example 1, a packaging material was produced in the same manner as in Example 1 except that a chill roll having no concave stripe portion was used.

<Performance evaluation of packaging materials>
In the packaging materials obtained in the above examples and comparative examples, Chinese seasonings (recovered hot pot meat: ingredients are soy sauce, soybean oil, vegetables (garlic, ginger), sugar, apple juice, touchi, bean miso, crab noodle soy sauce, Filled with 90g of mashed potato, bean sauce, fermented seasoning, starch, salt, chicken extract, pork extract, seasoning (amino acid), paste (xanthan), caramel color, acidulant, etc., and thermocompression-bonded (condition 210) C., 1 kg / cm ² , 1 second) to obtain a package.
This was retort sterilized at 121 ° C. for 30 minutes. After carrying out retort sterilization, it was allowed to stand at room temperature (23 ° C.) for 3 days. After standing still, one side of the short side of the package was cut with a cutter, an opening was formed, the contents were taken out from the opening, and the sliding property was evaluated.
The sliding property of the contents was evaluated by measuring the weight of the sliding contents 30 seconds after tilting using the apparatus shown in FIG. 11 (tilt angle 60 °). The results are summarized in Tables 1 and 2.

DESCRIPTION OF SYMBOLS 10: Resin film 11: Convex part 20: Mixture 21: T die 22: Chill roll provided with a concave part on the leaf surface 23: Nip roll 24: Resin film 25: Molding point 26: Peeling point 27: Air knife apparatus 30: Laminate 31: Base material 32: Barrier layer 33: Thermoplastic resin layer 34: Layer made of resin film 40: Packaging material 50: Packaging resistance 51: Cutting line 52: Notch 60: Sliding property evaluation device 61: Holding unit 62: Frame 63: Rotating shaft 64: Weight 65: Stopper 66: Sliding content weight measurement part α: Height of the ridge part γ: A valley at the nearest mountain and valley of the adjacent zigzag ridge part The shortest distance between the line extending the hypotenuse to form and the line extending the hypotenuse forming the mountain δ: angle formed by two hypotenuses H: distance between adjacent zigzag ridges L: length of the hypotenuse The X: fulcrum

Claims (11)

At least one surface has a plurality of ridges extending zigzag,
The resin film according to claim 1, wherein a cross-sectional shape of the ridge portion is substantially trapezoidal.   The resin film of Claim 1 whose cross-sectional shape of the said protruding item | line part is a substantially trapezoid which has an upper side of 10 micrometers or more and 100 micrometers or less, and a lower side of 50 micrometers or more and 200 micrometers.   The ratio (height / distance between adjacent ridges) between the height of the ridges and the distance between adjacent ridges is 0.01 or more and 0.1 or less, according to claim 1 or 2. The resin film as described.   The resin film as described in any one of Claims 1-3 whose height of the said protruding item | line part is 3 micrometers or more and 100 micrometers or less.   The resin film as described in any one of Claims 1-4 whose width | variety of the said protruding item | line part is 10 micrometers or more and 100 micrometers or less.   The shortest distance between the line extending the hypotenuse forming the valley and the line extending the hypotenuse forming the peak is 50 μm or more and 5000 μm or less between the adjacent peaks and valleys of the adjacent zigzag ridges. The resin film as described in any one of Claims 1-5 which exists.   The resin film as described in any one of Claims 1-5 whose angle formed by two oblique sides which form the peak or trough in the said zigzag-shaped convex strip part is 30 degrees or more and 170 degrees or less. A substrate;
A layer comprising the resin film according to any one of claims 1 to 7, comprising:
The laminated body characterized in that the surface having the ridges or ridges of the layer made of the resin film is the outermost surface. A packaging material comprising the resin film according to any one of claims 1 to 7 and having an opening for accommodating contents,
A packaging material, wherein a surface of the resin film having a ridge or a ridge extending in a zigzag shape is located inside the packaging material. A packaging material comprising the laminate according to claim 8 and having an opening for accommodating contents,
A packaging material characterized in that a zigzag-shaped projecting ridge portion or a surface having a ridge portion of a layer made of a resin film of the laminate is located inside the packaging material.   The packaging material according to claim 9 or 10, wherein the projecting ridge portion extends in a zigzag shape in a parallel direction with respect to the opening of the packaging material.