JP2018016732A - Resin film, laminate and packaging material - Google Patents

Abstract

Provided is a resin film that can be quickly removed even when the content is rich in oil when used as a packaging material, and can suppress the remaining of the content in the packaging material. .
A resin film of the present invention includes a plurality of regularly arranged unit protrusion groups, and each unit protrusion group has an elongated central protrusion located in the center and elongated shapes located on both sides of the central protrusion. Including a pair of side protrusions, and the center protrusion is longer than the side protrusions.
[Selection] Figure 1

Description

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

  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 liquids, semi-solids, 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.
Further, there is 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, oil-rich and highly viscous contents adhere to the inside of the packaging material and are difficult to remove in a short time. Further, the content finally remaining in the packaging material is discarded together with the packaging material, but disposal of the content is regarded as a problem from the environmental aspect.

  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 processing 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 can suppress the remaining of the content in the packaging material.

  The resin film of the present invention includes a plurality of regularly arranged unit protrusion groups, and each unit protrusion group includes an elongated central protrusion located at the center and a pair of elongated side faces located on both sides of the central protrusion. And the central protrusion is longer than the lateral protrusion.

  In the said aspect, it is preferable that a center protrusion and a side protrusion are extended in the same direction.

  In the above aspect, when a point that is equidistant from both ends in the longitudinal direction of the central projection is a central projection center point, and a point that is equidistant from both longitudinal ends of the side projection is a lateral projection center point The center point of the central protrusion and the center point of the side protrusion are preferably on the same line.

  In the said aspect, it is preferable that the unit protrusion group is arrange | positioned at zigzag form.

  The laminate of the present invention comprises a substrate and a layer made of the above-described resin film, and the surface having the unit protrusion group of the layer made of the resin film is the outermost surface.

  The packaging material of the present invention is composed of the above-mentioned laminate, has an opening for accommodating the contents, and the surface having the unit protrusion group of the layer composed of the resin film of the laminate is located inside the packaging material. And

  In the said aspect, it is preferable that the center protrusion and side protrusion which a unit protrusion group has extend in a parallel direction with respect to opening of the said packaging material.

  ADVANTAGE OF THE INVENTION According to this invention, the resin film, laminated body, and packaging material which have the high content sliding property and the 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 schematic cross-sectional view showing an embodiment of the method for producing a resin film of the present invention. FIG. 3 is a schematic cross-sectional view showing an embodiment of the method for producing a resin film of the present invention. FIG. 4 is a schematic cross-sectional view showing the laminate of the present invention in one embodiment. FIG. 5 is a front view showing the packaging material of the present invention in one embodiment. FIG. 6 is a front view showing the package of the present invention in one embodiment. FIG. 7 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. 8 is a front view illustrating the shaping shape of the chill roll surface included in the film forming machine used in Example 1. FIG.

(Resin film)
As shown in FIG. 1, the resin film 10 of the present invention is regularly arranged including an elongated central projection 11 located at the center and a pair of elongated lateral projections 12 located on both sides of the central projection 11. A plurality of unit protrusion groups 13 are provided.
Further, as shown in FIG. 1, the central protrusion 11 is longer than the side protrusion 12.
When the resin film 10 includes the unit protrusion group 13 as described above, when used for packaging materials such as a packaging bag and a packaging container, the contents, in particular, the oil-rich contents can be quickly slid down. . Furthermore, it is possible to prevent the contents from adhering and remaining.
This is because when the resin film 10 includes the unit protrusion group 13, the contact area between the resin film 10 and the content is reduced, and a gap is generated between the resin film 10 and the content. This is probably because the oil oozes out and an oil film is formed between the contents and the resin film 10, and when the contents are taken out, the contents can slide on the oil film.
In particular, in the present invention, the unit protrusion group 13 includes an elongated central protrusion 11 located at the center and a pair of elongated side protrusions 12 located on both sides of the central protrusion 11, so that oil accumulates and an oil film is formed. It is thought that it is easy to form.

  As shown in FIG. 1, it is preferable that the center protrusion 11 and the side protrusion 12 extend in the same direction. Thereby, oil film formation can be accelerated | stimulated and adhesion and remaining of the contents can be prevented more.

As shown in FIG. 1, a point that is equidistant from both ends in the longitudinal direction (Y direction in FIG. 1) of the central protrusion 11 is a central protrusion central point 14.
When the point that is equidistant from both ends in the longitudinal direction of the side projection 12 is the side projection center point 15,
It is preferable that the center projection center point 14 and the side projection center point 15 are on the same line. Thereby, oil film formation can be accelerated | stimulated and adhesion and remaining of the contents can be prevented more.

The unit protrusion groups 13 included in the resin film 10 of the present invention are regularly arranged, but can be, for example, staggered or latticed.
However, in the present invention, as shown in FIG. 1, the unit protrusion groups 13 are preferably arranged in a staggered manner. Thereby, oil film formation can be accelerated | stimulated and adhesion and remaining of the contents can be prevented more.
In the present invention, “staggered” means that a plurality of unit protrusion groups 13 are arranged at equal intervals in one direction (X direction in FIG. 1), and a direction orthogonal to the one direction (in FIG. 1). A plurality of unit projection groups 13 are also arranged at equal intervals in the Y direction), and unit projection groups 13 arranged at equal intervals in the X direction and unit projection groups 13 arranged at equal intervals in the Y direction are mutually connected. Refers to a misaligned arrangement.

The length α of the central protrusion 11 is preferably 10 μm or more and 1000 μm or less, more preferably 10 μm or more and 700 μm or less, and further preferably 10 μm or more and 500 μm or less. By setting the length α of the central protrusion 11 within the above numerical range, oil film formation can be promoted, and adhesion and remaining of the contents can be further prevented.
Further, the length β of the side protrusion 12 is preferably 10 μm or more and 800 μm or less, more preferably 10 μm or more and 600 μm or less, and further preferably 10 μm or more and 400 μm or less. By setting the length β of the side protrusion 12 within the above numerical range, oil film formation can be promoted, and adhesion and remaining of the contents can be further prevented.
The width γ of the central protrusion 11 and the side protrusion 12 is preferably 5 μm or more and 400 μm or less, more preferably 5 μm or more and 200 μm or less, and further preferably 5 μm or more and 100 μm or less. By setting the width γ of the central protrusion 11 and the side protrusion 12 within the above numerical range, oil film formation can be promoted, and adhesion and remaining of the contents can be further prevented. In addition, the width | variety of the center protrusion 11 and the side protrusion 12 may be the same, or may differ.

The height of the central protrusion 11 is preferably 5 μm or more and 1000 μm or less, more preferably 5 μm or more and 500 μm or less, and further preferably 5 μm or more and 100 μm or less. By setting the height of the central protrusion 11 within the above numerical range, oil film formation can be promoted, and adhesion and remaining of the contents can be further prevented.
Further, the height of the side protrusion 12 is preferably 5 μm or more and 1000 μm or less, more preferably 5 μm or more and 500 μm or less, and further preferably 5 μm or more and 100 μm or less. By setting the height of the side protrusion 12 within the above numerical range, oil film formation can be promoted, and adhesion and remaining of the contents can be further prevented.

  The distance A between the center protrusion center point 14 and the side protrusion center point 15 is preferably 10 μm or more and 1000 μm or less, more preferably 10 μm or more and 500 μm or less, and 10 μm or more and 200 μm or less. Is more preferable.

When the plurality of unit protrusion groups 13 are arranged at equal intervals in one direction (X direction in FIG. 1), the distance B between adjacent unit protrusion groups 13 is preferably 10 μm or more and 1000 μm or less, preferably 10 μm. As mentioned above, it is more preferable that it is 500 micrometers or less, and it is still more preferable that they are 10 micrometers or more and 200 micrometers or less.
In the present invention, the distance B between the adjacent unit protrusion groups 13 indicates the distance between the side protrusion center points 15 of the adjacent side protrusions 12 as shown in FIG.
Further, when the plurality of unit protrusion groups 13 are arranged at equal intervals in the direction orthogonal to the one direction (Y direction in FIG. 1), the distance C between adjacent unit protrusion groups 13 is 10 μm or more and 1000 μm or less. It is preferably 100 μm or more and 900 μm or less, more preferably 100 μm or more and 800 μm or less.
In the present invention, the distance C between adjacent unit protrusion groups 13 refers to the distance between the central protrusion center points 14 of the central protrusions 11 adjacent in the Y direction, as shown in FIG.

  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.

  The thickness of the resin film excluding the unit protrusion group is not particularly limited, and can be, for example, 10 μm or more and 100 μm or less.

(Method for producing resin film)
In one embodiment, the resin film 10 of the present invention is obtained by heating and melting a mixture comprising the above-described thermoplastic resin and extruding it into a sheet, and then extruding the mixture extruded into a sheet on its surface. It can manufacture by press-molding using the forming roll which has a some hollow corresponding to a unit protrusion group.

More specifically, as shown in FIG. 2, the resin film 10 of the present invention first extrudes the heated and melted mixture 20 from the T die 21, and then has a plurality of depressions corresponding to the unit protrusion groups on the surface. It can be produced by passing between the chill roll 22 and the nip roll 23 and applying pressure at this time.
In the present embodiment, the chill roll 22 corresponds to a forming roll having a plurality of depressions corresponding to the unit protrusion group. According to this method, the unit protrusion group 13 can be formed on the surface of the resin film at the molding point 25 at the same time as the resin film 10 is molded. The resin film 10 is peeled from the chill roll 22 at the peeling point 26. In addition, you may cool the resin film 10 after shaping | molding with 1 or 2 or more cooling rolls.

Further, as shown in FIG. 3, the resin film 10 of the present invention has a surface on which the mixture 20 extruded by extruding the heated and melted mixture 20 from the T-die 21 and then blowing air from the air knife device 27 is unitized. It can be obtained by pressing against a chill roll 22 having a plurality of depressions corresponding to the projection group.
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.

  In one embodiment, the resin film of the present invention is produced by extruding a mixture containing the above-described thermoplastic resin and the like, and the film corresponds to a unit protrusion group on the surface. It can manufacture also by embossing using the embossing roll which has a some hollow.

(Laminated body 30)
The laminate 30 according to the present invention includes a base material 31 and a layer 32 made of the above-described resin film, and a surface having a unit projection group of the resin film is an outermost surface.
The laminate 30 may further include a barrier layer 33 between the layer 32 made of a resin film and the base material 31, and may further include other layers such as a thermoplastic resin layer.

  As shown in FIG. 4, in one embodiment, the laminate 30 of the present invention comprises a base material 31, a barrier layer 33, a thermoplastic resin layer 34, and a layer 32 made of the resin film of the present invention in this order. Have.

(Substrate 31)
Although it does not specifically limit as the base material 31 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 31 is produced using the above-described resin, the thickness of the base material 31 is not particularly limited, but from the viewpoint of moldability, a material of 5 μm to 20 μm is normally used. Is preferred.
In order to improve the adhesion between the base material and the heat-sealable resin film, the surface of the base material 31 is activated by, for example, corona treatment, flame treatment, plasma treatment, or flame treatment. It is preferable to carry out the treatment.

Moreover, a paper base material can also be used as the base material 31, and natural pulp is not used other than non-coated paper such as kraft paper, high-quality paper, glossy kraft paper, pure white roll paper, glassine paper, and cup base paper. Synthetic 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 32 made of resin film>
The layer 32 made of the resin film constituting the laminate 30 according to the present invention is a layer disposed on the outermost side of the laminate 30, and the surface having the unit protrusion group of the resin film is located on the outermost surface. . The resin film is as described above.

(Other layers)
The laminate 30 according to the present invention may include other layers between the base material 31 and the layer 32 made of a 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 33, a thermoplastic resin layer 34, an adhesive layer (not shown), and a printed layer (not shown).

(Barrier layer 33)
The laminate 30 according to the present invention can include a barrier layer 33.
The barrier layer 33 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. Since the laminate has the barrier layer 33, the laminate 30 is imparted with 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. be able to. Note that the laminate may include two or more barrier layers 33. When two or more barrier layers 33 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 other inorganic or inorganic oxide vapor deposition films 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 33 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 34)
The thermoplastic resin layer 34 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 Graft polymerization or copolymerization of unsaturated carboxylic acid, unsaturated carboxylic acid, unsaturated carboxylic acid anhydride, ester monomer to polymer resin, ethylene-maleic acid copolymer resin, ionomer resin, polyolefin resin Resin, resin obtained by graft modification of maleic anhydride to polyolefin resin It can be comprised of. The thermoplastic resin layer 34 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 40 of the present invention is made of the above laminate, has an opening for accommodating the contents, and a surface having the unit projection group 13 of the resin film is located on the inner side (the contents side). (See FIG. 5).
When the packaging material 40 has such a configuration, the contact area of the contents can be reduced, and the contents slipping-off property and the remaining prevention function of the packaging material 40 can be enhanced.

  In the packaging material 40, the central protrusion 11 and the side protrusion 12 of the unit protrusion group 13 located on the inner surface extend in a direction perpendicular to the opening, even if they extend in a direction parallel to the opening. However, from the viewpoint of the sliding property of the contents and the remaining prevention function, as shown in FIG. 5, it is more preferable to extend in a direction perpendicular to the opening.

  In one embodiment, the laminate 30 is overlapped so that the unit protrusion groups 13 of the layer 32 made of the resin film of the laminate 30 are opposed to each other, and the peripheral end portion is heat-sealed to produce the packaging material 40. can do. In one embodiment, packaging material 40 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 50)
The package 50 of the present invention can be manufactured by filling the contents from the opening of the packaging material 40 described above and heat-sealing the opening.

  As shown in FIG. 6, 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 notch for opening.

  The contents filled in the package 50 are not particularly limited, but are preferably rich in oil. Specific examples include kaisenbetsu, curry and stew.

(Sliding property evaluation method for packaging materials)
In the present invention, the sliding property of the packaging material 40 can be measured by using the sliding property evaluation apparatus 60 shown in FIG. According to this apparatus, the inclination speed, inclination angle, etc. of the packaging material 40 can be fixed, and the sliding property exhibited by the packaging material 40 can be more accurately evaluated.
As shown in FIG. 7, 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 depression in a direction parallel to the film feeding direction as shown in FIG.
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 (nip pressure: 3 kg / cm ² ).
On the surface of the obtained resin film, as shown in FIG. 1, unit protrusion groups having central protrusions and side protrusions extending in the same direction were formed in a staggered manner.
Further, the center projection center point and the side projection center point are on the same line, the center projection length α is 400 μm, the side projection length β is 200 μm, the center projection and the side projection. The width γ was 10 μm, and the heights of the central and side protrusions were 5 μm.
The distance A between the center protrusion center point and the side protrusion center point is 200 μm, the distance B between the unit protrusion groups adjacent in the X direction is 200 μm, and the distance C between the unit protrusion groups adjacent in the Y direction is It was 600 μm.
The thickness of the resin film was 70 μm.

<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 unit protrusion group 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 on which the unit protrusion groups of the resin film are formed face each other, and the central protrusion and the side protrusion extend in a direction parallel to the opening. Then, two vertical sides and one horizontal side were thermocompression bonded with a width of 10 mm (conditions: 210 ° C., 1 kg / cm ² , 1 second) to obtain a packaging material.

(Comparative Example 1)
A packaging material was produced in the same manner as in Example 1 except that the resin film was changed to a polypropylene film (trade name: Treffan ZK99S, manufactured by Toray Film Processing Co., Ltd.).

<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) ℃, 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, an opening was formed, the contents were taken out from the opening, and the sliding property was evaluated.
The sliding property of the content was evaluated by measuring the weight of the sliding content 30 seconds after tilting using the apparatus shown in FIG. 7 (tilt angle 60 °). The results are summarized in Table 1.

10: Resin film 11: Center protrusion 12: Side protrusion 13: Unit protrusion group 14: Center protrusion center point 15: Side protrusion center point 20: Mixture 21: T die 22: Chill roll 23: Nip roll 24: Resin film 25: Molding point 26: Release point 27: Air knife device 30: Laminate 31: Base material 32: Layer made of resin film 33: Barrier layer 34: Thermoplastic resin layer 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 measuring unit α: Length of central projection β: Length of lateral projection γ: Center protrusion and side protrusion A: Distance between center protrusion center point and side protrusion center point B: Distance between unit protrusion groups adjacent in the X direction C: Distance between unit protrusion groups adjacent in the Y direction X: Point

Claims (7)

A resin film comprising a plurality of unit protrusion groups arranged regularly,
Each unit projection group includes an elongated central projection located in the center and a pair of elongated lateral projections located on both sides of the central projection,
The resin film, wherein the central protrusion is longer than the lateral protrusion.   The resin film according to claim 1, wherein the central protrusion and the lateral protrusion extend in the same direction. A point that is equidistant from both ends in the longitudinal direction of the central protrusion is a central protrusion central point,
When a point that is equidistant from both ends in the longitudinal direction of the side projection is a side projection center point,
The resin film according to claim 1 or 2, wherein the central projection central point and the lateral projection central point are on the same line.   The resin film according to claim 1, wherein the unit protrusion groups are arranged in a staggered manner. A substrate and a layer formed of the resin film according to any one of claims 1 to 4,
A laminate comprising:
A laminate having a unit projection group of a layer made of the resin film is an outermost surface. A packaging material comprising the laminate according to claim 5 and having an opening for containing contents,
A packaging material, wherein a surface having a unit projection group of a layer made of a resin film of the laminate is located inside the packaging material.   The packaging material according to claim 6, wherein a central projection and a lateral projection of the unit projection group extend in a direction parallel to the opening of the packaging material.