JP2017080926A - Packaging material and packaging body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging material which control slipperiness in an easy step without imparting an uneven shape thereto, and has various physical properties such as easy low temperature heat sealability and tearing properties, and to provide a packaging body using the same.SOLUTION: There is provided a packaging material 10 of two or more layers including at least a laminate layer 2 and a seal layer 1 laminated on one surface of the laminate layer 1, where the seal layer 1 has a lower density than that of the laminate layer 2, a density of a main resin used in the seal layer 1 is in a range of 0.915-930 g/cm, 200-400 ppm of a slip agent is contained in the seal layer 1, and a thermoplastic elastomer is contained in the seal layer 1.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a packaging material that imparts slipping characteristics by utilizing the solubility and diffusibility of an additive and suppresses the bleed-out phenomenon of the additive, and a package using the same.

  For packaging powders and liquids, heat sealability and adhesion to other laminated substrates such as polyethylene, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, polyamide, and polyester are generally used. Good and inexpensive films are used as packaging materials.

  As an example of the package, there is a standing pouch used for a storage container for liquid detergent such as shampoo and body soap. The physical properties required for this standing pouch are required to include slipping during processing, impact resistance and piercing resistance when external force is applied, package self-supporting property, tearability when opening the package, and the like.

  In particular, in the manufacturing process of packaging bodies such as standing pouches, if the slidability of the packaging material is low, the handling property at the time of molding will be insufficient, which will cause wrinkles in the film production line, resulting in packaging with wrinkles. The material must be destroyed. For this reason, material loss increases, which causes an increase in material cost and a decrease in yield.

  In order to improve the slipperiness of the packaging material, it is necessary to change the surface free energy of the packaging material. For example, a method to reduce the contact area by providing a concavo-convex shape on the surface of the packaging material, a method to add a slip agent that can reduce the surface free energy, to reduce the energy loss when the material is deformed, and to increase the surface area at the time of contact In order to avoid this, it has been proposed to use a material having high rigidity (Patent Document 1).

  For example, a measure is taken to add an uneven shape to the plastic film of the seal layer. By adding a concave and convex shape to the plastic film, the contact area is reduced to increase the slipperiness and to suppress the folding when the package is made, improving the self-supporting property of the film, but the concave and convex shape on the seal layer surface If a material with sufficiently high rigidity is not used, the uneven shape is deformed by the pressure at the time of contact between the films.

  As a result, since the contact area between the seal layers increases, improvement in slipperiness cannot be expected, and further, it is necessary to pass through a press plate process for imparting uneven shapes, resulting in an increase in manufacturing cost due to a decrease in yield. Cause.

  Further, in order to improve the tearability of the entire package, it has been proposed to combine a sealing layer having a higher material density than the laminated layer with respect to the laminated film based on the biaxially stretched nylon film (Patent Document 2). ).

  However, when a highly rigid material is used for the sealing layer, the slipping property is improved, but the heat sealing property at a low temperature cannot be expected, and the high-speed filling suitability is not sufficient.

  Furthermore, one method for improving the slipperiness of the packaging material is to add a slip agent. By adding the slip agent to the resin, the slip property is exhibited by the bleed-out phenomenon that precipitates on the film surface. be able to.

  However, excessive bleed-out on the resin surface over time causes slipping too much, causing problems such as winding displacement during film formation, and problems such as being unable to grasp a predetermined amount with a mechanical arm during bag making. Production becomes difficult.

Japanese Patent No. 4871456 Japanese Patent Laid-Open No. 10-337828

  Therefore, the present invention provides a packaging material having various physical properties such as low-temperature heat-sealability and tearability, and a packaging body using the same, which can control slipping characteristics in a simple process without imparting uneven shapes. The purpose is to do.

As means for solving the above problems, the invention according to claim 1 is a packaging material having two or more layers including at least a laminate layer and a sealing layer laminated on one surface of the laminate layer. ,
The sealing layer has a lower density than the laminate layer,
And the density of the main resin used for the seal layer is in the range of 0.915 g / cm ³ or more and 930 g / cm ³ or less, the slip layer contains a slip agent in a content of 200 ppm or more and 400 ppm or less,
In addition, the packaging material is characterized in that a thermoplastic elastomer is contained in the seal layer.

The invention described in Claim 2 is the packaging material of claim 1, wherein the density of the laminate layer is not more than 0.930 g / cm ³ or more 0.960 g / cm ^3.

  The invention according to claim 3 is the packaging material according to claim 1 or 2, wherein the seal layer and the laminate layer are made of an olefin resin.

  The thermoplastic elastomer contained in the seal layer may be a styrene-isoprene-styrene copolymer (SIS), a styrene-butadiene-styrene block copolymer (SBS), or a styrene-ethylene. The wrapping material according to any one of claims 1 to 3, which contains any one of a butadiene-styrene block copolymer (SEBS).

  The invention according to claim 5 is the packaging material according to any one of claims 1 to 4, wherein the static friction coefficient of the seal layer is 0.2 or more and 0.5 or less. is there.

  The invention according to claim 6 is characterized in that the sealing layer and the laminate layer each have a thickness of 20 μm or more and 300 μm or less, and the packaging material according to any one of claims 1 to 5. It is.

  The invention according to claim 7 is the packaging material according to any one of claims 1 to 6, wherein the seal layers and the laminate layers are alternately and repeatedly laminated.

Moreover, invention of Claim 8 is because the edge part is heat-sealed in the state which faced the sealing layer surface of the two packaging materials as described in any one of Claims 1-7. It is a package characterized by being made into a bag.

  By improving the solubility of the slip agent according to the present invention, the slip characteristics can be controlled, and further improvement in filling suitability when used as a packaging material, low temperature heat sealability, and a packaging material that sufficiently maintains the strength between layers. It became possible to produce films.

It is the cross-sectional conceptual diagram which showed the structure of the packaging material of this invention. It is the cross-sectional conceptual diagram which showed the structure of the multilayered packaging material of this invention. It is the plane conceptual diagram which showed the structure of the standing pouch which is a package body before bag making from the packaging material of this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings. The drawing is schematically shown, and the size, shape, and the like of each part are appropriately exaggerated for easy understanding.

<Overall configuration>
FIG. 1 shows a configuration of a packaging material 10 according to the present invention, and at least a seal layer 1 is provided on one surface of a laminate layer 2.

  FIG. 2 shows another embodiment of the packaging material of the present invention, which shows the structure of a multilayered packaging material, in which a sealing layer 1 (four layers 1a, 1b, 1c, and 1d in the figure) and a laminate are shown. In this example, layer 2 (four layers 2a, 2b, 2c, and 2d in the figure) is repeated four times, for a total of eight layers. Although the number of repeated laminations is not particularly limited, it is preferable that the total thickness (1a + 1b + 1c + 1d in the case of FIG. 2) of the laminated seal layers 1 is 20 μm or more. The total thickness ratio of the seal layers 1 is preferably set to 50% or less with respect to the total thickness of all the seal layers 1 and the laminate layers 2 as in the case of the two-layer configuration.

<Slipperiness>
In the packaging material 10 of the present invention, a thermoplastic elastomer is added to the seal layer 1 in order to control slipperiness. In general, resins such as polyethylene and polypropylene having no reactive group have low solubility of slip agents. Furthermore, since the ethylene-vinyl acetate copolymer and the ethylene-vinyl alcohol copolymer have few reactive groups depending on the polymerization amount, the solubility of the slip agent is not high.

  Therefore, in the present invention, the addition of a thermoplastic elastomer increases the amount of reactive groups in the film and further improves the molecular mobility, so that the slip agent can stay inside the film.

  Further, a density difference is provided between the resin used for the seal layer 1 and the resin used for the laminate layer 2, and the seal layer 1 has a lower density than the laminate layer 2. That is, since the diffusion coefficient of the slip agent decreases as the resin density increases, the slip agent does not transfer to the laminate layer 2 side. Thereby, the slip controllability of one surface can be improved.

<Heat sealability>
A low density resin is used for the seal layer 1. Generally, the lower the density of the material used for the surface of the packaging material 10 during bag making, the lower the temperature necessary for achieving a molten state, so that heat sealing can be performed at a lower temperature. Further, as described above, a thermoplastic elastomer is added to the seal layer 1 for slipperiness control. Here, by adding a thermoplastic elastomer, the amount of heat of fusion becomes small, so that it is possible to achieve both slip control and low temperature heat sealability.

<High adhesion strength>
The resin used for the seal layer 1 and the resin used for the laminate layer 2 preferably have the same main component. Specifically, as described later, if an olefin-based thermoplastic resin is used for the seal layer 1, it is preferable to use an olefin-based thermoplastic resin for the laminate layer 2. Thereby, the adhesive strength between the seal layer 1 and the laminate layer 2 is increased, and the strength between the layers can be sufficiently maintained.

<Tearability>
Regarding tearability, generally, the higher the density of a resin, the smaller the force required to tear the packaging material 10. In the present invention, since a high-density resin is used for the laminate layer 11, it has an effect of increasing the tearing force of the entire packaging material 10, and the force when tearing the packaging material 10 can be minimized. .

  Details of each component in the embodiment of the present invention will be described below.

<Packaging material 10>
The film obtained by repeatedly laminating the packaging material 10 and the packaging material 10 is not particularly limited as long as it is a thickness used in a general packaging material, but the thicknesses of the seal layer 1 and the laminate layer 2 are respectively It is preferable to use in the range of 20 μm to 300 μm.

  When the film thickness of the seal layer 1 is insufficient, the content of the thermoplastic elastomer is lowered, so that it is difficult to control the slip characteristics, and when it is too thick, the cost increases and is not practical. For this reason, the minimum film thickness of the seal layer 1 is preferably 20 μm or more.

  Further, the lamination ratio of the seal layer 1 and the laminate layer 2 is preferably set to 50% or less with respect to the total film thickness of the seal layer 1 and the laminate layer 2 combined. This is because, by making the laminate layer 2 made of a high-density resin thicker than the seal layer 1, it is possible to achieve both appropriate rigidity and impact resistance.

  As shown in FIG. 2, the seal layer 1 and the laminate layer 2 may be repeatedly laminated. By repeatedly laminating the sealing layer 1 having a high density and the laminating layer 2 having a low density, the above-described various physical properties can be improved.

<Sealing layer>
As the main material of the seal layer 1, any thermoplastic resin can be used. However, in order to be used as a general packaging material, it needs to have appropriate flexibility and good workability. is there. From this, it is possible to select a single substance or a plurality of polyethylenes based on olefins or derivatives thereof and use them appropriately.

<Density of seal layer>
Resin used in the sealing layer 1, JISK7112: density defined by the method described in 1999 it is preferably not more than 0.915 g / cm ³ or more 0.930 g / cm ^3. When the density is lower than 0.915 g / cm ³ , the solubility of the slip agent is improved too much, and good slipperiness control is not exhibited. In addition, when it is higher than 0.930 g / cm ³ , since the diffusion coefficient of the slip agent is lowered, good slip properties are not exhibited.

<Static friction coefficient of seal layer>
Since the packaging material 10 of the present invention uses a low-density resin for the seal layer 1 located on the outermost surface, the static friction coefficient is low and the slipperiness is poor. Here, in order to improve the slipperiness, it is preferable to adjust the coefficient of static friction by appropriately adding a slip agent described later.

  That is, it is preferable that the static friction coefficient is 0.2 or more and 0.5 or less when measured by a method referring to JISP8147: 2010 within the above density range. When the static friction coefficient is larger than 0.5, the handling property at the time of molding is not sufficient, which causes wrinkles in the film forming line. On the other hand, if it is less than 0.2, the slipperiness becomes too high, and there is a risk of film slippage.

<Thermoplastic elastomer>
In order to make the packaging material 10 compatible with the slip agent, a material having thermoplastic elastomer properties is added to the seal layer 1. The thermoplastic elastomer is not particularly limited, but ester polyurethane, ether polyurethane, polycarbonate polyurethane, polycaprolactam polyurethane, silicone rubber mainly composed of polysiloxane, fluorine rubber containing fluorine resin, styrene -Butadiene-styrene block copolymer (SBS), styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), styrene-ethylene-butadiene-styrene block copolymer ( SEBS), styrene-ethylene-propylene-styrene block copolymer (SEPS), hydrogenated styrene-butadiene block copolymer (HSBR), styrene-butadiene block copolymer (SB) Rubber block containing styrene block such as styrene-isoprene block copolymer (SI), styrene-ethylene-propylene block copolymer (SEP), styrene-butadiene-butylene-styrene block copolymer (SBBS), etc. Examples of the copolymer include ethylene-propylene copolymer (EP), ethylene-butene-1 copolymer (EB), ethylene-octene copolymer (EO), and propylene-butadiene copolymer (PB). By adding these to the seal layer 1, the slip characteristics can be controlled.

  In particular, it is necessary to select a material having good compatibility with olefins within the moldable temperature range of the thermoplastic olefin resin that is the main material of the seal layer 1. Styrene-isoprene-styrene block copolymer (SIS), styrene-butadiene-styrene block copolymer (SBS), and styrene-ethylene-butadiene-styrene block copolymer (SEBS) are used to satisfy the above properties. It is preferable to do.

<Mixing ratio of thermoplastic elastomer>
The mixing ratio of the thermoplastic elastomer to the olefin-based material that is the main material of the seal layer 1 is preferably used in the range of 3% to 25%, and preferably in the range of 5% to 10%. More preferred. If it is less than 3%, the solubility of the slip agent is small, and if it exceeds 25%, it is difficult to obtain sufficient tearability when used as a packaging material.

  Also, although it is generally an olefin resin with good moldability, if the amount of thermoplastic elastomer added increases, the neck-in in the T-die film formation of the extruder will increase, and the tension during melting will increase. Since it falls, it becomes difficult to obtain the uniform packaging material 10.

<Laminate layer>
About the constituent material of the laminate layer 2, like the seal layer 1, it is possible to use at least one combination among polyethylene which is an olefin resin and derivatives thereof.

<Density of laminate layer>
The density of the resin used for the laminate layer 2 may be selected to be equal to or higher than the density of the layer constituting material of the seal layer 1, but the density specified in JIS K7112: 1999 is 0.930 g / More preferably, it is in the range of not less than cm ^{3 and not} more than 0.960 g / cm ³ . This is because a commercially available resin is limited to 0.960 g / cm ³ or more, and adhesion with a laminated substrate other than the seal layer 1 cannot be sufficiently secured.

When it is lower than 0.930 g / cm ³ , the rigidity is lowered, and the ease of opening due to the improvement of the self-supporting property and the tearing property is lowered. Therefore, it is appropriate to use a resin having the above density.

<Additives>
The seal layer 1 and the laminate layer 2 may contain various additives in order to improve processability during film molding and suitability when using a film. When included, for example, an anti-blocking agent such as a filler or a slip agent for improving slipperiness can be added as appropriate.

  Examples of anti-blocking agents such as fillers include acrylic particles, styrene particles, styrene acrylic particles and cross-linked products thereof, polyurethane particles, polyester particles, silicon particles, fluorine particles, copolymers thereof, and pyrophyllite. , Clay compounds particles such as talc, smectite, vermiculite, mica, chlorite, kaolin mineral, sepiolite, silica, titanium oxide, alumina, silica alumina, zirconia, zinc oxide, strontium oxide, aluminum hydroxide, strontium carbonate, strontium chloride, Strontium sulfate, strontium nitrate, strontium hydroxide, glass particles, and the like can be used as appropriate.

  Examples of slip agents for improving slipperiness include, for example, sucrose fatty acid esters and glycerin fatty acid esters. Synthetic resin systems include hydrocarbons such as liquid paraffin, paraffin wax and synthetic polyethylene wax, fatty acid systems such as stearyl alcohol, and stearic acid. Fatty acid amides such as amide, oleic acid amide and erucic acid amide can be preferably used.

  The amount of slip agent added is preferably in the range of 200 ppm to 400 ppm. When the content is less than 200 ppm, the slipping property is insufficient, causing wrinkles during film formation, resulting in an increase in material loss. On the other hand, if it is added in excess of 400 ppm, the slipping property becomes excessive, causing problems such as winding slippage during film formation and the possibility of stable production.

<Functional layer>
A functional layer (not shown) such as a vapor deposition layer or a printing layer may be formed between the seal layer 1 and the laminate layer 2 or on the surface of the laminate layer 2 that does not contact the seal layer 1. The vapor deposition layer is formed to give the packaging material a barrier property, and has a function of enhancing the barrier property to protect the packaging material from gases such as oxygen contained in the air, water vapor, enclosed contents, etc. Have.

  A general metal vapor deposition such as aluminum or silica can be used, and a transparent vapor deposition layer can be formed like alumina. Furthermore, an EVOH layer or the like can be used as appropriate. In addition to the vapor deposition layer and the printing layer, a layer that imparts other functions to the packaging material 10 may be provided as appropriate.

<Packaging body>
Examples of the package 20 using the packaging material 10 of the present invention include a standing pouch, a packaging bag, a pouch with a cap, a lami tube, a back-in box, and the like, and can be used for various other purposes.

  FIG. 3 is a schematic view showing an example of a standing pouch before bag making which is one of the embodiments of the present invention. As an example of the manufacturing method of the package 20, bag making can be performed by taking two packages 20 in the cooling roll width direction, bending the front and back of the seal layer 1 side, and heat-sealing the ends. .

  By using the packaging material 10 for the bag making of the packaging body 20, the slipperiness of the sealing opening of the packaging body 20 is improved, and the opening property is improved. Moreover, the ease of opening by the improvement of the self-supporting property by high rigidity and the tearing property also improves.

<Manufacturing method>
The method for producing the packaging material 10 of the present invention is not particularly limited, and a known method can be used. For the seal layer 1, it is necessary to mix the olefin-based material as a main component and a thermoplastic elastomer. For example, a general blender such as a single-screw extruder, a twin-screw extruder, or a multi-screw extruder. For example, a melt kneading method using, a method in which each solvent is dissolved or dispersed and mixed, and then the solvent is removed by heating can be used. In consideration of workability, it is preferable to use a single screw extruder or a twin screw extruder.

  When using a single screw extruder, it is preferable to use a screw having a mixing element with high kneadability. The biaxial kneader is not particularly limited to the same direction rotating twin screw extruder, the different direction rotating twin screw extruder, and the screw shape is also a full flight screw or kneading disc type.

  The method described above can also be used for the laminate layer 2.

  The method for laminating the seal layer 1 and the laminate layer 2 is not particularly limited, and a known method can be used. For example, a method of laminating a film obtained by forming a seal layer 1 and a laminate layer 2 by applying heat above the melting point to each film and applying pressure, or heating the seal layer 1 and the laminate layer 2 with different extruders. A method of laminating in a molten state to obtain a film can be used. In consideration of workability, a laminating method using a co-extruder for laminating in a molten state to obtain a film is preferable.

  As the coextrusion method, the thermoplastic resin that becomes each layer is melted with an extruder, and then the molten resin is laminated with a feed block to obtain a laminated film from the T-die. The feed block method, and the plastic that becomes each layer with an extruder It is possible to use a multi-manifold method in which a laminated film is obtained by melting and then passing through a manifold to obtain a laminated film, or a multilayer inflation molding method.

  A method of repeatedly laminating one or more combinations of the seal layer 1 and the laminate layer 2 is not particularly limited. As a method of repeatedly laminating, a method of laminating each melted resin using an extruder for the necessary layers, and a method of laminating after laminating films in which the seal layer 1 and the laminate layer 2 are laminated to the melting point or more, respectively. A method using a multilayer feed block in which the seal layer 1 and the laminate layer 2 are melted with an extruder and then the film flow path is divided and laminated can be used.

  As mentioned above, although embodiment of this invention was illustrated, this invention is not limited to the said embodiment, Unless it deviates from the technical idea of this embodiment, it considers the use as a packaging material, and is requested | required. It goes without saying that other layers can be arbitrarily formed for the purpose of improving other physical properties.

  Hereinafter, examples of the present invention will be described in more detail. However, the present invention is not limited only to the following examples, and the present invention is not limited at all unless it exceeds the gist.

<Example 1>
As the main resin of the seal layer 1, LLDPE (Evolue SP2040 manufactured by Prime Polymer Co., Ltd.) having a density of 0.918 g / cm ³ and SISD 1113 (manufactured by Kraton Polymer Co., Ltd.) which is a SIS thermoplastic elastomer (hereinafter abbreviated as SIS) are used. The materials were mixed by dry blending so that the material ratio (weight ratio) was 5% and the content (weight ratio) of erucamide (manufactured by Nippon Seika Co., Ltd.) as a slip agent was 300 ppm.

The raw material of the seal layer 1 mixed by dry blending is put into an extruder, heated and melted to 230 ° C., and HDPE Hi-Zex HZ3300 (manufactured by Prime Polymer Co., Ltd.) having a density of 0.950 g / cm ³ is uniaxial as the laminate layer 2 Example 1 was put into an extruder, heated and melted at 230 ° C., and laminated using a feed block T die so that the thicknesses of the seal layer 1 and the laminate layer 2 were 50 μm and 50 μm, and the laminate thickness was 100 μm, respectively. Was made.

<Example 2>
The sealing material 1 was mixed by dry blending so that the content of erucic acid amide as a slip agent was 400 ppm, and other configurations were made in the same manner as in Example 1 to prepare a packaging material.

<Example 3>
The sealing layer 1 was mixed by dry blending so that the content of erucic acid amide as a slip agent was 200 ppm, and other configurations were made in the same manner as in Example 1 to prepare a packaging material.

<Example 4>
A packaging material was prepared in the same manner as in Example 1 except that the seal layer 1 and the laminate layer 2 were laminated so that the thicknesses were 20 μm and 80 μm, respectively.

<Example 5>
A packaging material was prepared in the same manner as in Example 1 except that the sealing layer 1 was mixed by dry blending so that the material ratio of SIS thermoplastic elastomer was 10%.

<Example 6>
A packaging material was prepared in the same manner as in Example 1 except that the sealing layer 1 was mixed by dry blending so that the material ratio of SIS thermoplastic elastomer was 3%.

<Example 7>
A packaging material was prepared in the same manner as in Example 1 except that the sealing layer 1 was mixed by dry blending so that the material ratio of SIS thermoplastic elastomer was 20%.

<Example 8>
A packaging material was prepared in the same manner as in Example 1 except that the sealing layer 1 was mixed by dry blending so that the material ratio of SIS thermoplastic elastomer was 25%.

<Example 9>
The main resin of the seal layer 1 was LLDPE Umerit 2525F (manufactured by Ube Industries Co., Ltd.) having a density of 0.926 g / cm ³ , and other configurations were made in the same manner as in Example 1 to produce a packaging material.

<Example 10>
The main resin of the seal layer 1 was LDPE Novatec LC600A (manufactured by Nippon Polyethylene Co., Ltd.) having a density of 0.918 g / cm ³ , and other configurations were made in the same manner as in Example 1 to produce a packaging material.

<Example 11>
The seal layer 1 and the laminate layer 2 were respectively 10 μm and 10 μm in thickness, and 5 layers were alternately laminated to prepare a packaging material having a total thickness of 10 layers of 100 μm. Other configurations are the same as those of the first embodiment.

<Comparative Example 1>
The SIS was laminated on the seal layer 1 without mixing, and other configurations were made in the same manner as in Example 1 to produce a packaging material.

<Comparative example 2>
The sealing layer 1 was mixed with 1000 ppm of erucic acid amide and laminated, and other configurations were made in the same manner as in Example 1 to prepare a packaging material.

<Comparative Example 3>
The sealing layer 1 was mixed with 50 ppm of erucic acid amide and laminated, and other configurations were made in the same manner as in Example 1 to prepare a packaging material.

<Comparative example 4>
The main resin of the seal layer 1 was LLDPE057A (manufactured by Ube Industries Co., Ltd.) having a density of 0.902 g / cm ³ .

<Comparative Example 5>
The main resin of the seal layer 1 was LLDPE Evolu SP3530 (manufactured by Prime Polymer Co., Ltd.) having a density of 0.936 g / cm ³ , and the packaging material was prepared in the same manner as in Example 1 with the other configurations.

<Comparative Example 6>
Only the laminate layer 2 was formed, and a packaging material was prepared in the same manner as in Example 1 for the other components.

<Static friction coefficient evaluation experiment>
In order to evaluate the slipperiness, the static friction coefficient was measured with reference to the gradient method described in JISP8147: 2010. As a device, a static friction coefficient measuring device satisfying JISP8147: 2010 gradient method manufactured by Toyo Seiki Co., Ltd. was used.

The films described in Examples and Comparative Examples were cut into 100 mm width × 240 mm length and 30 mm width × 80 mm length. A film cut to 100 mm width × 240 mm length is fixed to a static friction coefficient measuring device satisfying the JISP8147: 2010 gradient method so as not to bend, and a film cut to 30 mm width × 80 mm length is 30 mm width × 40 mm length × The measurement surface was fixed so as to cover the entire weight with respect to a weight having a height of 30 mm and a weight of 197 g. Measurement was performed 5 times, and the average value was calculated to 2 decimal places.
The evaluation standard of slipperiness was that the coefficient of static friction was ◯: 0.20 or more and 0.50 or less ×: other than that.

<Heat seal strength evaluation experiment>
In the measurement of the heat seal strength, a heat sealer TP-701-B (manufactured by Tester Sangyo Co., Ltd.) was used, the seal pressure was 0.2 MPa, the seal time was 1 second, the seal width was 10 mm, and the seal temperature was 130 ° C and 150 ° C. The seal layers were sealed. The sealed film is cut into 15 mm width × 80 mm, the distance between chucks is 20 mm, the tensile speed is 300 mm / min, and the tensile tester AGS-500NX (manufactured by Shimadzu Corporation) is used, and the measurement is performed five times by the T-shaped peeling method. Carried out. The evaluation criteria for the low-temperature heat sealability were ◯: 10 N / 15 mm or more, Δ: 7 N / 15 mm or more, and X: less than 7 N / 15 mm.

<Impact resistance evaluation test>
In the measurement of impact resistance, an impact test method based on the JISK7124-1 free fall dart method and Part 1 staircase method A method using a Dart Impact Tester IM-302 (manufactured by Tester Sangyo Co., Ltd.) was evaluated. ◯: 50% breaking weight is 350 g or more Δ: 50% breaking weight is 350 g to 250 g
X: The 50% breaking weight was 250 g or less.

<Tearability evaluation test>
In tearing evaluation, it measured using the tear method by Elmendorf described in JISK7128-2. At this time, the measurement was carried out five times for each of the MD directions of the film, and the evaluation criteria for tearability were ○: 5 N or less Δ: 5 N to 10 N
X: 10N or more.

<Material cost evaluation>
As evaluations other than the above-mentioned physical property values, evaluation was made based on the rate of increase in material cost with respect to Example 1.
X: 20% or more

<Comprehensive evaluation>
As a comprehensive judgment, the evaluation criteria are: ○: all are good Δ: no problem, but inferior to ○ when used ×: problem in use.

  The above evaluation results are shown in Table 1.

  From the results of Table 1, it can be seen that Examples 1 to 11 having the embodiments of the present invention maintain a certain degree of slipperiness and improve various physical properties such as low temperature heat seal and tearability.

On the other hand, since the comparative example 1 does not add the thermoplastic elastomer, the slipperiness is excessive. In Comparative Example 2 as well, since slip agent is added in an amount of more than 400 ppm, the slipping property is excessive, and the cost increase rate is 20% or more.

  In Comparative Examples 3 and 4, since the amount of slip agent added is small, or the resin density of the seal layer 1 is low, the slip agent is completely dissolved in the elastomer in the seal layer 1 and does not bleed out to the surface. It can be confirmed that the slipperiness is inferior.

  In Comparative Examples 5 and 6, since the resin density used in the seal layer 1 is high or not used, it can be confirmed that the heat sealability is remarkably lowered and the impact resistance is also poor.

DESCRIPTION OF SYMBOLS 1 ... Seal layer 2 ... Laminate layer 1a, 1b, 1c, 1d ... Each seal layer 2a, 2b, 2c, 2d of multilayer structure ... Each laminate layer 10 of multilayer structure ... Packaging material 20 ... Packaging body

Claims (8)

A packaging material of two or more layers including at least a laminate layer and a seal layer laminated on one surface of the laminate layer,
The sealing layer has a lower density than the laminate layer,
And the density of the main resin used for the seal layer is in the range of 0.915 g / cm ³ or more and 930 g / cm ³ or less, the slip layer contains a slip agent in a content of 200 ppm or more and 400 ppm or less,
A packaging material comprising a thermoplastic elastomer in the seal layer. Packaging material according to claim 1, wherein the density of the main resin used in the laminate layer is not more than 0.930 g / cm ³ or more 0.960 g / cm ^3.   The packaging material according to claim 1 or 2, wherein the seal layer and the laminate layer are made of an olefin resin.   The thermoplastic elastomer contained in the sealing layer is a styrene-isoprene-styrene copolymer (SIS), a styrene-butadiene-styrene block copolymer (SBS), or a styrene-ethylene-butadiene-styrene block copolymer (SEBS). Any one is contained, The packaging material as described in any one of Claims 1-3 characterized by the above-mentioned.   The packaging material according to any one of claims 1 to 4, wherein a static friction coefficient of the seal layer is 0.2 or more and 0.5 or less.   The packaging material according to any one of claims 1 to 5, wherein the seal layer and the laminate layer each have a thickness of 20 µm or more and 300 µm or less.   The packaging material according to any one of claims 1 to 6, wherein the seal layer and the laminate layer are alternately and repeatedly laminated.   The package body, wherein the two packaging materials according to any one of claims 1 to 7 are bag-formed by heat-sealing the end portions in a state where the seal layer faces each other. .

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