JP6690292B2 - Resin films, laminates and packaging materials - Google Patents

Description

  The present invention relates to a resin film, a laminate and a packaging material.

  In many commercial fields such as foods, beverages, pharmaceuticals, and chemicals, packaging materials have been developed according to their contents. In particular, as a packaging material for filling the contents having a viscous body such as a liquid or a semi-solid or a gel-like substance, a plastic material excellent in water resistance, oil resistance, gas barrier properties, lightweight, flexibility, and designability is used. It is used and functions to protect the contents required of packaging materials.

As one of the functions of the packaging material, the slipping property of the contents is demanded so that the contents can be taken out quickly in a shorter time.
There is also a demand for a content remaining prevention function capable of preventing the content from adhering to and remaining on the inner surface of the packaging material.
In particular, the contents rich in oil and having high viscosity adhere to the inside of the packaging material, making it difficult to take out in a short time. Further, finally, the content remaining in the packaging material is discarded together with the packaging material, but the disposal of this content is regarded as an environmental problem.

  For such a problem, for example, in a film packaging material, it has been proposed to apply a fluorine-based material to the sealant side to improve the detachability between the contents and the laminated film (Patent Document 1). See). Further, it has been proposed to provide a heat-sealing resin layer containing hydrophobic fine particles such as silicone particles on one surface of the base material (see Patent Document 2).

Japanese Patent No. 3623540 JP, 2013-18533, A

However, when a fluorine-based material is applied as proposed in Patent Document 1, there is a problem that the heat-sealing property required when producing a packaging material becomes 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 possibility that the fine particles may fall off and mix into the contents during storage. It was

  The present invention has been made in view of the above problems, and an object thereof is to add a modifying agent such as fine particles or a lubricant component to the film surface, by applying a surface treatment, to obtain a packaging material. It is an object of the present invention to provide a resin film that can be quickly taken out even when the content is rich in oil and can suppress the content from remaining in the packaging material.

  The resin film of the present invention is characterized by having a plurality of convex streak portions or concave streak portions extending in a zigzag shape on at least one surface.

  In the above aspect, the height or depth of each of the ridges or the ridges is preferably 1 μm or more and 1000 μm or less in width and / or pitch.

  In the above aspect, it is preferable that the height or depth of each of the ridges or the ridges is 5 μm or more and 100 μm or less.

  In the above aspect, it is preferable that the width of each ridge or groove is 10 μm or more and 200 μm or less.

  In the above aspect, it is preferable that the distance between the adjacent ridges or the adjacent ridges is 5 μm or more and 800 μm or less.

The laminate of the present invention comprises a substrate and the resin film,
The surface of the resin film having the convex streak or the concave streak is the outermost surface.

The packaging material of the present invention is composed of the above laminated body, and has an opening for storing the contents,
It is characterized in that the surface of the layer made of the resin film of the laminate, which has the zigzag-shaped convex portions or concave portions, is located inside the packaging material.

  In the above aspect, it is preferable that the ridges or the ridges extend in a zigzag shape in a direction parallel to the opening of the packaging material.

  ADVANTAGE OF THE INVENTION According to this invention, the resin film, the laminated body, and packaging material which have a high content sliding property and a content remaining prevention function are provided.

FIG. 1 is a front view showing a resin film of the present invention in one embodiment. 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 perspective view showing the resin film of the present invention in one embodiment. FIG. 5 is a schematic cross-sectional view showing one embodiment of the resin film manufacturing method of the present invention. FIG. 6 is a schematic cross-sectional view showing an embodiment of the method for producing a resin film of the present invention. FIG. 7: is a schematic cross section showing the laminated body of this 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 packaging material of this invention in one embodiment. FIG. 10: is a front view showing the package of this invention in one embodiment. FIG. 11 is a perspective view of a slidability evaluation apparatus used for evaluating slidability of the packaging material of the present invention. FIG. 12 is a front view showing a shape of a chill roll surface included in the film forming machine used in Examples 1-1 to 1-9, 2-1 to 2-9, Comparative Example 1-1 and Comparative Example 2-1. It is a figure. FIG. 13: is a front view showing the shaping | molding shape of the chill roll surface with which the film-forming machine used in Comparative Examples 1-2 and 2-2 is equipped.

(Resin film)
As shown in FIGS. 1 to 4, the resin film 10 of the present invention has a plurality of ridges or grooves 11 extending in a zigzag shape. Due to the resin film having such a structure, when used as a packaging material such as a packaging bag and a packaging container, the content, particularly the content rich in oil, can be quickly slid off. Furthermore, it is possible to prevent the contents from adhering and remaining.
This is because the resin film has a plurality of convex stripes or concave stripes extending in a zigzag pattern on the surface thereof, the contact area with the content becomes small, and a void is formed between the content and the resin film. Occurrence occurs, oil content oozes out from the contents into the voids, an oil film is formed between the contents and the resin film, and when the contents are taken out, the contents can slide on the oil film. It is thought to be because.
In particular, in the present invention, for example, since the ridge extends in a zigzag shape, it is considered that oil is accumulated and an oil film is easily formed.
In the present invention, the "zigzag shape" includes not only the dogleg shape shown in Fig. 1 and the like but also the Z shape, but from the viewpoint of slipping property of contents and prevention of remaining, it is a dogleg shape. Preferably there is.

  In one embodiment, as shown in FIG. 1, the convex stripes and the concave stripes 11 may extend in a zigzag shape from one end of the film 10 to the other, and as shown in FIG. It may extend.

  The height or depth α of the ridges and the ridges is preferably 1 μm or more and 1000 μm or less, more preferably 5 μm or more and 100 μm or less, and further preferably 10 μm or more and 50 μm or less. It is particularly preferable that the thickness is 10 μm or more and 25 μm or less. By setting the height or depth α of the ridges and the ridges in the above numerical range, it is possible to further improve the slipping-off property and the function of preventing the contents from remaining when the resin film is used as a packaging material. In addition, it is possible to prevent the formed oil film from becoming too thick and excessively leaving the oil inside the packaging material.

  The width β of the ridges and the ridges is preferably 1 μm or more and 1000 μm or less, more preferably 10 μm or more and 200 μm or less, and further preferably 10 μm or more and 100 μm or less. By setting the width β of the ridges and the ridges in the above numerical range, it is possible to further improve the slipping-off property and the function of preventing the contents from remaining when the resin film is used as a packaging material. In addition, it is possible to prevent the formed oil film from becoming too thick and excessively leaving the oil inside the packaging material.

  The distance (pitch) γ between adjacent ridges (recesses) is preferably 1 μm or more and 1000 μm or less, more preferably 5 μm or more and 800 μm or less, and 10 μm or more and 500 μm or less. Is more preferable and 10 μm or more and 300 μm or less is particularly preferable. By setting the pitch γ within the above numerical range, it is possible to further improve the sliding property of the contents and the function of preventing remaining when the resin film is used as a packaging material. In addition, it is possible to prevent the formed oil film from becoming too thick and excessively leaving the oil inside the packaging material.

  As shown in FIG. 1, when the ridge portion or the recess portion extends in a zigzag shape like a dogleg, the zigzag angle δ is preferably 10 ° or more and 170 ° or less, and 20 ° or more, The angle is more preferably 120 ° or less, further preferably 40 ° or more and 80 ° or less.

  In the present invention, the height or depth α, the width β and the pitch γ of the ridges and the ridges on the surface of the resin film are measured, for example, by using Surfcom 1400G (trade name) manufactured by Tokyo Seimitsu Co., Ltd. can do. In the present invention, the height of the ridges and the depth of the ridges on the surface of the resin film refer to the length from the lowest point to the highest point in the resin film, as shown in FIGS. Further, the width means the lateral width of the ridge portion or the ridge portion as shown in FIGS. In addition, as shown in FIGS. 3 and 4, the pitch is defined by the line extending from the hypotenuse and the crest of the adjacent zigzag ridges or troughs that are closest to each other. It is the shortest distance from the line that extends the hypotenuse.

  The resin film according to the present invention may include a thermoplastic resin. Since the resin film contains the thermoplastic resin, heat sealing properties 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% by mass or less, and more preferably 70% by mass or more and 100% by mass or less. By setting the content of the thermoplastic resin in the resin film within the above numerical range, the heat sealability of the resin film can be further improved.

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, acrylic acid ester or methacrylic acid ester. Acrylic resins containing as a main component, polyesters such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate, and polyacetals. These materials can be used alone or in combination of two or more.
In the present invention, it is preferable to use a polyolefin resin as the thermoplastic resin, and polypropylene is more preferable from the viewpoint of heat resistance.

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

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

  The thickness of the resin film is not particularly limited, but may be, for example, 50 μm or more and 100 μm or less.

(Method for manufacturing resin film)
In one embodiment, the resin film of the present invention, a mixture comprising the above-mentioned thermoplastic resin, is heated and melted, extruded into a sheet shape, then the mixture extruded into a sheet shape, zigzag on the surface. It can be manufactured by pressure molding using a molding roll having a plurality of ridges or recesses.

More specifically, as shown in FIG. 5, first, the heat-melted mixture 20 is extruded from a T-die 21, and then a chill roll 22 having a plurality of ridges or grooves extending in a zigzag pattern on the surface is formed. , Nip roll 23, and pressurizing at this time can be used for production.
In the present embodiment, the chill roll 22 corresponds to a forming roll having a plurality of convex strips or concave strips extending in a zigzag pattern on the surface. According to this method, at the same time when the resin film 14 is molded, it is possible to form a plurality of convex streaks or concave streaks extending in the zigzag shape on the surface of the resin film at the imprinting points 25. The resin film 24 is peeled off from the chill roll 22 at the peeling point 26. The resin film after molding may be cooled by one or more cooling rolls.

Further, as shown in FIG. 6, the resin film extrudes the mixture 20 heated and melted from the T die 21, and then ejects the mixture extruded by blowing air from the air knife device 27 onto the surface of the zigzag ridge. It can be obtained by pressing against a chill roll 22 having a plurality of sections or recessed sections.
Moreover, you may cool the resin film after shaping | molding using 1 or 2 or more cooling rolls.

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

  The height or depth α ′ of the convex streak and the concave streak on the surface of the molding roll is preferably 1 μm or more and 1000 μm or less, more preferably 5 μm or more and 100 μm or less, and 10 μm or more and 50 μm or less. It is more preferable that the thickness is 10 μm or more and 25 μm or less.

  The width β ′ of the ridges and the ridges on the surface of the molding roll is preferably 1 μm or more and 1000 μm or less, more preferably 10 μm or more and 200 μm or less, and further preferably 10 μm or more and 100 μm or less. preferable.

  The pitch γ ′ of the ridges and the ridges on the surface of the forming roll is preferably 1 μm or more and 1000 μm or less, more preferably 5 μm or more and 800 μm or less, and further preferably 10 μm or more and 500 μm or less. It is preferably 10 μm or more and 300 μm or less.

  Further, in one embodiment, the resin film of the present invention is produced by extruding a mixture containing the above-mentioned thermoplastic resin or the like to prepare a film, and a zigzag-shaped ridge portion is formed on the surface of the film. Alternatively, it can also be manufactured by performing embossing using an embossing roll having a plurality of groove portions.

(Laminate)
A laminate according to the present invention comprises a layer made of the above-mentioned resin film and a base material, and a surface of the resin film having a ridge or a groove is an outermost surface.
This laminated body may further have a barrier layer between the layer made of a resin film and the base material, and may further have other layers such as a thermoplastic resin layer.

  The structure of the laminate of the present invention in one embodiment will be described with reference to FIG. 7. According to the aspect of the present invention, there is provided a laminate 30 having 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)
The base material constituting the laminate according to the present invention is not particularly limited, but can be produced using a resin having 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 Combined resin, ethylene-methacrylic acid copolymer, ethylene-propylene copolymer, methylpentene resin, polybutene resin, acid-modified polyolefin-based resin, polyamide-based resin, polystyrene-based 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, and particularly polyethylene terephthalate (PET) resins are preferable because of their good moldability.
When the base material is produced using the above-mentioned resin, the thickness of the base material layer is not particularly limited, but from the viewpoint of moldability, the thickness of 5 μm to 20 μm is usually used. preferable.
Further, in order to improve the adhesiveness between these base materials and the heat-sealable resin film, the surface of the base materials is subjected to surface activation treatment such as corona treatment, flame treatment, plasma treatment, or flame treatment. Is preferably performed.

Further, as the base material, a paper base material can be used, and other than uncoated paper such as kraft paper, high-quality paper, single-gloss kraft paper, pure white roll paper, glassine paper, and cup base paper, synthetic without using natural pulp. Paper or the like can be used.
As the paper base material, for example, a general coating layer for finely coated printing paper, coated printing paper, resin-coated paper, processed base paper, release base paper, double-sided coated release base paper, etc., which will be described later, may be formed. It is also possible to use commercially available products.

<Layer made of resin film>
The layer made of the resin film constituting the laminate according to the present invention is the outermost layer of the laminate, and the surface of the resin film having the convex stripes or the concave stripes is located on the outermost surface. The resin film is as described above.

(Other layers)
The laminate according to the present invention may include other layers between the base material and the resin film. When two or more other layers are provided, they may have the same composition or different compositions. Examples of the other layer include a barrier layer, a thermoplastic resin layer, an adhesive layer, and a printed layer.

(Barrier layer)
The laminate according to the present invention may comprise a barrier layer.
The 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. The vapor-deposited film can be formed by a conventionally known method using a conventionally known inorganic substance or inorganic oxide, and its composition and forming method are not particularly limited. When the laminate has a barrier layer, it is possible to impart or improve gas barrier properties that prevent the transmission of oxygen gas, water vapor, etc., and light shielding properties that prevent the transmission of visible light, ultraviolet light, etc., to the laminate. it can. The laminated body may have two or more barrier layers. When two or more barrier layers are provided, they may have the same composition or different compositions.

Examples of the deposited film include silicon (Si), aluminum (Al), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), boron (B), titanium (Ti). ), Lead (Pb), zirconium (Zr), yttrium (Y) or the like, or a vapor deposition film of an inorganic oxide can be used.
Particularly suitable as a packaging material (bag) or the like is a vapor-deposited film of aluminum metal, or a vapor-deposited film of silicon oxide or aluminum metal or aluminum oxide.

The inorganic oxide is represented by MO _X , for example, SiO _X , AlO _X, etc. (where M represents an inorganic element, and the value of X is different depending on the inorganic element). expressed. As the 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, Potassium (K) is 0 to 0.5, tin (Sn) is 0 to 2, sodium (Na) is 0 to 0.5, boron (B) is 0 to 1 and 5, titanium (Ti). Is 0 to 2, lead (Pb) is 0 to 1, zirconium (Zr) is 0 to 2, and yttrium (Y) is 0 to 1.5. In the above, when X = 0, the substance is a complete inorganic 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 preferably used for the packaging material, and 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. The value of can be used.

In the present invention, the thickness of the vapor deposition film of the inorganic material or the inorganic oxide as described above varies depending on the type of the inorganic material or the inorganic oxide to be used, but is, for example, 50 to 2000 Å position, preferably 100 to 1000 Å position. It is desirable to form it by arbitrarily selecting within the range.
More specifically, in the case of a vapor deposited film of aluminum, a film thickness of 50 to 600Å or 100 to 450Å is desirable, and in the case of a vapor deposited film of aluminum oxide or silicon oxide, a film thickness of 50 to 500Å. 100 to 300Å is desirable.

  Examples of the method for forming the vapor deposition film include physical vapor deposition methods (Physical Vapor Deposition method, PVD method) such as vacuum vapor deposition method, sputtering method, and ion plating method, or plasma chemical vapor deposition method, thermochemical method. The chemical vapor deposition method (Chemical Vapor Deposition method, CVD method), such as a vapor phase growth method and a photochemical vapor deposition method, etc. can be mentioned.

  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 and the like are preferable from the viewpoint of gas barrier properties that prevent transmission of oxygen gas and water vapor and the like and light blocking properties that prevent transmission of visible light and ultraviolet light.

(Thermoplastic resin layer)
The thermoplastic resin layer is 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 Polymer resin, ethylene-maleic acid copolymer resin, ionomer resin, polyolefin resin, unsaturated carboxylic acid, unsaturated carboxylic acid, unsaturated carboxylic acid anhydride, resin grafted or copolymerized ester monomer , Resins such as maleic anhydride graft-modified with polyolefin resins It can become Nde. The thermoplastic resin layer may contain two or more of the above materials.

(Adhesive layer)
The adhesive layer is a layer formed by laminating any two layers of the layers included in the laminate, and is an adhesive layer or an adhesive resin layer. As the adhesive for lamination, for example, one-component or two-component curing or non-curing type vinyl type, (meth) acrylic type, polyamide type, polyester type, polyether type, polyurethane type, epoxy type, rubber type, Other solvent-based, water-based, emulsion-type, or other laminating adhesives can be used. As a method for coating the above-mentioned adhesive, for example, direct gravure roll coating method, gravure roll coating method, kiss coating method, reverse roll coating method, Fonten method, transfer roll coating method, or other method can be applied. 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 above thermoplastic resin is used.

(Print layer)
The print layer is a layer provided to impart design properties such as characters, information, patterns, and pictures to the laminate. The printed layer can be formed using a conventionally known coloring agent such as a pigment or dye, and the forming method is not particularly limited. For example, inorganic pigments such as titanium white, zinc white, rouge, vermilion, ultramarine, cobalt blue titanium yellow, yellow lead, carbon black, isoindolinone yellow, Hansa yellow A, quinacridone red, permanent red 4R, phthalocyanine blue, indus. Organic pigments (or dyes) such as Renblue RS and aniline black, metal pigments made of metal powder such as aluminum and brass, titanium dioxide coated mica, pearl luster made of foil powder such as basic lead carbonate (pearl) 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 made of the above-mentioned laminated body, has an opening for accommodating the contents, and has a ridge portion or a concave portion extending in a zigzag shape of the resin film inside (the contents side) thereof. The surface is located (see FIGS. 8 and 9).
Since the packaging material has such a configuration, the contact area of the content can be reduced, and the sliding property of the content of the packaging material and the residual prevention function can be enhanced.

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

  In one embodiment, the resin material of the laminate is stacked so that the surfaces having the convex stripes or concave stripes extending in a zigzag shape face each other, and the peripheral edges are heat-sealed to produce a packaging material. can do. Moreover, in one embodiment, the packaging material may be a self-supporting packaging material (standing pouch).

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

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

  As shown in FIG. 10, it may have a cutting line 51 for forming an opening for taking out contents, and may have a notch 52 which is a notch for opening.

  The contents to be packed in the package are not particularly limited, but those rich in oil are preferable. Specific examples include fried pot meat, curry, stew and the like.

(Sliding property evaluation method for packaging materials)
In the present invention, the slidability of the packaging material 40 can be measured by using the slidability evaluation apparatus 60 shown in FIG. According to this apparatus, the inclination speed, the inclination angle, etc. of the packaging material 40 can be fixed, and the slipping property of the packaging material 40 can be evaluated more accurately.
As shown in FIG. 11, the slidability evaluation apparatus 60 rotates a frame 62 having a holding portion 61 capable of holding the packaging material 40 around a rotating shaft 63 to thereby hold the holding portion 61 and the packaging material 40. The packaging material and contents can be slid down.
More specifically, a string in which a weight 64 is bound is attached to one end (lower end) of the frame 62, and the weight 64 is dropped via the fulcrum X.
As a result, 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 tilted. it can.
The inclination angles of the holding portion 61 and the packaging material 40 can be controlled by providing a stopper 65 such as a bar that comes into contact with the rotating holding portion 61 and the packaging material and can stop the rotation.
The weight of the content slid off from the packaging material 40 can be measured by the slidable content weight measuring unit 66 arranged in advance at the dropping point. The measuring unit may be capable of measuring the weight over time.

  Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to these Examples.

(Example 1-1)
<Production of resin film>
First, a film forming machine equipped with a T-die and a chill roll was prepared. The surface of the chill roll was shaped, and had ridges extending zigzag in a direction parallel to the film feeding direction as shown in FIG. The depth of the groove was 10 μm, the width was 50 μm, and the pitch was 100 μm.
Subsequently, 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 (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, and the height was 10 μm, the width was 50 μm, and the pitch was 100 μm (printing rate 95%). . The thickness of the resin film was 80 μm.

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

<Preparation of packaging material>
Two pieces of the obtained laminate were cut into a size of 170 mm × 130 mm so that the surfaces of the resin film on which the ridges were formed faced each other, and the ridges were extended in a zigzag direction in a direction parallel to the opening. It was arranged and thermocompression bonded (condition: 210 ° C., 1 kg / cm ² , 1 second) with a length of 2 mm and a width of 10 mm in a width of 10 mm to obtain a packaging material.

(Examples 1-2 to 1-9 and Comparative examples 1-1 and 1-2)
In the same manner as in Example 1-1, except that the depth, width, and pitch of the concave stripes on the surface of the chill roll were changed to obtain a resin film having convex stripes with the height, width, and pitch shown in Table 1. A packaging material was made.
In Example 1-9, a packaging material was produced in the same manner as in Example 1-1, except that the ridges were arranged so as to extend zigzag in the direction perpendicular to the opening.
In Comparative Example 1-2, as shown in FIG. 13, the shaping of the surface of the chill roll provided in the film forming machine used for the production of the film is provided with the linearly extending recessed portion in the direction parallel to the feeding direction of the film. A packaging material was prepared in the same manner as in Example 1-1, except that the packaging material was used. The ridges on the film surface were arranged so as to extend linearly in a direction parallel to the opening, and a packaging material was produced.

(Example 2-1)
A packaging material was produced in the same manner as in Example 1-1, except that a chill roll having a convex strip extending in a zigzag shape was used instead of the chill roll having a concave strip. The ridges of the chill roll had a height of 10 μm, a width of 50 μm, and a pitch of 100 μm. The resin film obtained by using this chill roll had a groove on the surface thereof, the groove had a depth of 10 μm, a width of 50 μm, and a pitch of 100 μm (shape ratio 95%). .

(Examples 2-2 to 2-8 and Comparative examples 2-1 to 2-2)
In the same manner as in Example 2-1, except that the height, width and pitch of the ridges on the surface of the chill roll were changed to form a resin film having recesses having the height, width and pitch shown in Table 2. A packaging material was made.
In Example 2-9, a packaging material was produced in the same manner as in Example 2-1 except that the groove portion was arranged so as to extend in a zigzag shape in the vertical direction with respect to the opening.
In Comparative Example 2-2, except that the shaping of the chill roll surface provided in the film forming machine used for producing the film was changed to one having a linear projection extending in a direction parallel to the film feeding direction. A packaging material was prepared in the same manner as in Example 2-1. The ridges on the surface of the film were arranged so as to extend linearly in the direction parallel to the opening, and a packaging material was produced.

<Performance evaluation of packaging materials>
In the packaging materials obtained in the above Examples and Comparative Examples, Chinese seasonings (steamed meat: components are soy sauce, soybean oil, vegetables (garlic, ginger), sugar, apple juice, touchi, bean miso, bean noodle sauce, 90 g of mashed potatoes, soy sauce, fermented seasoning, starch, salt, chicken extract, pork extract, seasoning (amino acid), paste (xanthan), caramel color, acidulant, etc. are filled and thermocompression is applied (condition 210). ℃, 1kg / ^cm 2, 1 second), it was carried out retort sterilization for 30 minutes at 121 ° C.. 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 to form an opening, the contents were taken out from the opening, and the sliding property was evaluated.
The slidability of the contents was evaluated by using the device shown in FIG. 11 (inclination angle 60 °) and measuring the weight of the slid contents 30 seconds after the inclination. The results are summarized in Tables 1 and 2.

10: Resin film 11: Convex or concave section 20: Mixture 21: T die 22: Chill roll 23: Nip roll 24: Resin film 25: Imprinting point 26: Peeling point 27: Air knife device 30: Laminate 31: Base Material 32: Barrier layer 33: Thermoplastic resin layer 34: Layer consisting of resin film 40: Packaging material 50: Packaging resistance 51: Cutting line 52: Notch 60: Sliding property evaluation device 61: Holding part 62: Frame 63: Rotation Axis 64: Weight 65: Stopper 66: Sliding contents weight measuring part α: Height or depth of the convex or concave portion β: Width of the convex or concave portion γ: Between adjacent convex portions or Distance between concave streaks δ: Zigzag angle X: Support point

Claims (8)

A resin film used as a packaging material,
At least one surface has a plurality of convex strips or concave strips extending in a zigzag shape,
The resin film in which the said convex line part or the concave line part is provided so that it may extend in a zigzag shape in a parallel direction with respect to the opening of the said packaging material .   The resin film according to claim 1, wherein the height or depth, the width and / or the pitch of each of the ridges or the ridges is 1 μm or more and 1000 μm or less.   The resin film according to claim 1 or 2, wherein the height or depth of each of the ridges or the ridges is 5 µm or more and 100 µm or less.   The resin film according to any one of claims 1 to 3, wherein the width of each of the ridges or the ridges is 10 µm or more and 200 µm or less.   The resin film according to any one of claims 1 to 4, wherein a distance between adjacent ridges or recesses is 5 µm or more and 800 µm or less. Base material,
A laminated body comprising a layer made of the resin film according to claim 1.
A layered product, wherein a surface of the layer made of the resin film having a ridge or a groove is an outermost surface. A packaging material comprising the laminate according to claim 6 and having an opening for containing the contents,
A packaging material, wherein a surface having a convex strip portion or a concave strip portion extending in a zigzag shape of a layer made of a resin film of the laminate is located inside the packaging material.   The packaging material according to claim 7, wherein the ridges or recesses extend in a zigzag shape in a direction parallel to the opening of the packaging material.