JP2019014055A - Packaging sealant film, packaging material and package - Google Patents

Abstract

To provide a packaging sealant film that has excellent slipperiness and base material adhesiveness in a processing process while maintaining heat sealability, a packaging material that uses the packaging sealant film and has excellent breaking resistance, airtightness, and openability when opening the packaging bag, and a package using the packaging material.SOLUTION: A packaging sealant film 1 has at least two layers. When a layer having a front face 4, which is one face, is defined as a front face layer 6, and a layer having a rear face 5, which is an opposite face to the front face 4, is defined as a rear face layer 8, the front face layer 6 is blended with silicone gum 3 at a rate of 0.25-3 wt.% to a resin constituting the front face layer 6. The rear face layer 8 is not blended with the silicone gum 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a sealant film for packaging, a packaging material, and a package.

  The packaging material is used, for example, in a packaging bag for packaging food products, pharmaceuticals, and the like, and the contents of the packaging bag have various states such as liquid, powder, paste, and solid. In the technical field to which this packaging bag belongs, for example, plastic film packaging using films of polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-vinyl alcohol copolymer, polyamide, polyester, etc. is often used. ing.

  Such packaging bags include, for example, filling ability when filling contents, bag breaking property when external force is applied (that is, no bag breakage), air tightness, opening property when opening the packaging bag, etc. Characteristics are required. In order to obtain such a packaging bag, the packaging material has good impact resistance, heat sealability, tearability, rigidity, barrier property, etc. At the same time, there is a need for properties such as laminate suitability, which indicate whether they can be firmly adhered to each other.

  For example, by using low-density polyethylene or the like for the packaging bag material, that is, the packaging material, it can have good impact resistance and low-temperature heat-sealability, but it is easy to block due to poor slipping in the processing step. Problems can arise. In addition, the slipperiness may cause wrinkles, and the film winding property may deteriorate. In addition, the yield may be reduced due to the appearance of blocking marks due to blocking, film breakage in printing and laminating processes, and tension fluctuation.

  In order to solve these problems of slipperiness, a countermeasure is taken in which a lubricant or an antiblocking agent is mixed with low density polyethylene or the like. For example, in Patent Document 1, this problem is solved by defining two types of lubricants and anti-blocking agents.

Japanese Patent No. 5628132

  However, in the method of Patent Document 1, since the amount of low-molecular-weight lubricant added is large, the slidability may change over time. Furthermore, when the film containing the lubricant and the base material are bonded together to form a packaging material, the adhesive strength between the film and the base material may decrease due to a large amount of low molecular weight lubricant. Then, due to the decrease in the adhesive strength, the bag breaking property when an external force is applied may be deteriorated.

  The properties of the thermoplastic resin may change depending on its type, the presence or absence of an adhesive, its type, temperature conditions, and the like. In general, when a large amount of a low molecular weight lubricant is added to a thermoplastic resin, the lubricant may move to the film surface due to a change with time after film formation or after temperature change, so-called bleed out may occur. Therefore, the slipperiness may change depending on storage conditions and product processing conditions. In addition, the lubricant may be transferred to the back surface or another film in contact with the film surface where the low molecular weight lubricant is bleed out, and the sliding property of the transferred surface may be changed.

Furthermore, when a barrier layer or a base material layer is laminated on a thermoplastic resin to form a package, it varies depending on the type of adhesive and the temperature conditions, etc., but low molecular weight lubricants are particularly useful when the temperature rises. Or absorbed near the layer boundary between the adhesive and the thermoplastic resin. At this time, the adhesive strength between the layers (laminate strength) is lowered, and the bag breaking property may be deteriorated.
Accordingly, the present invention provides a film for packaging material (packaging sealant film) having good slipperiness and substrate adhesion in a processing step while maintaining heat sealability, and a bag breakage using the packaging material film It is an object to provide a packaging material having good properties and a packaging body using the packaging material.

  In order to achieve the above object, according to one embodiment of the present invention, there is provided a packaging sealant film including at least two layers, a surface layer having a surface which is one surface, and a back surface being a surface opposite to the surface. When the layer having the back layer is a back layer, silicone gum is added to the surface layer at a ratio of 0.25 wt% to 3 wt% with respect to the resin constituting the surface layer. Is a sealant film for packaging, wherein the silicone gum is not added.

Another aspect of the present invention is a packaging material characterized in that at least a base material is laminated on the back surface of the packaging sealant film.
Another aspect of the present invention is a package using the packaging material.

In one embodiment of the present invention, the silicone gum is contained in the surface, which is one surface of the packaging sealant film, in a proportion of 0.25 wt% to 3 wt% with respect to the thermoplastic resin. Good slipperiness in the processing step can be obtained while maintaining the properties.
Furthermore, since silicone gum is not included on the back surface, the adhesive strength of the packaging material in which the base material is laminated can be maintained, and a good bag breaking property can be obtained as a packaging body using the packaging material. .

It is sectional drawing which showed an example of the structure of the sealant film for packaging which concerns on 1st embodiment of this invention. It is sectional drawing which showed an example of the structure of the packaging material provided with the sealant film for packaging which concerns on 1st embodiment of this invention. It is sectional drawing which showed an example of the structure of the sealant film for packaging which concerns on 1st embodiment of this invention. It is sectional drawing which showed an example of the structure of the sealant film for packaging which concerns on 1st embodiment of this invention. It is sectional drawing which showed an example of the structure of the sealant film for packaging which concerns on 1st embodiment of this invention. It is sectional drawing which showed an example of the structure of the packaging material provided with the sealant film for packaging which concerns on 1st embodiment of this invention. It is sectional drawing which showed an example of the structure of the package provided with the packaging material which concerns on 1st embodiment of this invention. It is sectional drawing which showed an example of the structure of the sealant film for packaging which concerns on 2nd embodiment of this invention. It is sectional drawing which showed an example of the structure of the packaging material provided with the sealant film for packaging which concerns on 2nd embodiment of this invention. It is sectional drawing which showed an example of the structure of the sealant film for packaging which concerns on 2nd embodiment of this invention. It is sectional drawing which showed an example of the structure of the sealant film for packaging which concerns on 2nd embodiment of this invention.

  Below, each embodiment of the sealant film for packaging which concerns on this invention is described. Each figure is a schematic diagram, and the size, shape, and the like of each part are appropriately exaggerated for easy understanding. For the sake of simplicity, the same reference numerals are given to corresponding parts in the drawings. In addition, each embodiment shown below exemplifies a configuration for embodying the technical idea of the present invention, and the technical idea of the present invention is that the material, shape, structure, etc. of components are as follows. It is not something specific. The technical idea of the present invention can be variously modified within the technical scope defined by the claims described in the claims.

(First embodiment)
The packaging sealant film according to the first embodiment of the present invention (hereinafter also simply referred to as “sealant film”) is a packaging sealant film 1 comprising at least two layers as shown in FIG. When the surface layer 6 is a surface layer 6, and the layer having the back surface 5 opposite to the surface 4 is a back layer 8, the surface layer 6 has a silicone gum with respect to the thermoplastic resin 2. 3 is added at a ratio of 0.25 wt% to 3 wt%. In addition, the silicone gum 3 is not added to the back layer 8.

  The thermoplastic resin 2 is a material having good impact resistance and low-temperature heat sealability, and is a material that is difficult to slip. On the other hand, the silicone gum 3 contained in the surface layer 6 is a material that has a small surface free energy and is more slippery than the thermoplastic resin 2. Therefore, by adding the silicone gum 3 to the surface layer 6 within the range of 0.25 wt% to 3 wt% with respect to the thermoplastic resin 2, good slipperiness can be obtained while maintaining heat sealability. Can do.

  When the addition amount of the silicone gum 3 is less than 0.25%, the friction coefficient on the surface 4 becomes large, and it becomes difficult to slip. This is because the contact between the sealant films 1 at the portion where the silicone gum 3 is not exposed increases. As a result, for example, when the sealant film 1 is being transported or when the sealant film 1 is overlapped, the sealant film 1 may be wrinkled, or the sealant film 1 may be stretched due to increased take-up tension. Moreover, blocking resistance will also fall, the sealant films 1 after winding may closely_contact | adhere, and an external appearance nonuniformity, tension fluctuation | variation, or the fracture | rupture of the sealant film 1 may arise.

On the other hand, when the addition amount of the silicone gum 3 exceeds 3%, the ratio of the thermoplastic resin 2 constituting the surface layer 6 decreases, and the silicone gum 3 obstructs the pressure bonding when the heat pressure bonding is performed. As a result, the heat sealability may deteriorate.
Here, silicone is polyorganosiloxane which is a polymer substance in which an organic group is added to a structure in which a silicon atom is bonded to another silicon atom through an oxygen atom. Examples of the organic group include alkyl groups such as methyl group, ethyl group, propyl group, 3,3,3-trifluoropropyl group, and 3-chloropropyl group, and cycloalkyl groups such as cyclopentyl group and cyclohexyl group. An aryl group such as a phenyl group or a xylyl group, an aralkyl group such as a benzyl group, a phenethyl group, or a 3-phenylpropyl group, a methoxy group, an ethoxy group, or a propoxy group can be used as appropriate.

Furthermore, the silicone gum 3 shall show a thing with a number average molecular weight of several hundred thousand or more among the above-mentioned silicones. More preferably, the number average molecular weight is 400,000 or more.
Silicone properties vary greatly depending on the molecular weight. Generally, a high molecular weight silicone having a molecular weight of 100,000 or more becomes a gum, and a low molecular weight silicone less than 100,000 becomes an oil. When the molecular weight is less than 100,000, the property becomes oily, and thus the silicone component may move in the thermoplastic resin 2. In that case, the sliding property of the surface 4 may change due to bleeding out of the silicone component depending on temperature and time. Furthermore, when the amount of silicone on the surface 4 increases, the heat sealability may be reduced. Moreover, when the amount of silicone in the back surface 5 increases, problems such as poor adhesion may occur at the time of adhesion to other base materials that are necessary when used as a packaging material described later.

  Since the silicone gum 3 having a number average molecular weight of several hundreds of thousands or more is a high molecular weight substance, it causes movement in the sealant film 1 and bleed-out associated therewith like a low molecular weight silicone oil or a conventional low molecular weight lubricant. The frequency is reduced. Therefore, stable slipperiness can be imparted to the surface 4. Further, the frequency of causing the heat seal inhibition and poor adhesion as described above is also reduced. For example, the sealant film 1 is often stored at a temperature higher than room temperature due to aging or the like, but the silicone gum 3 hardly moves in the sealant film 1 due to such a temperature change. The slipperiness is stable.

Further, the narrower molecular weight distribution of the silicone gum 3 is better, and in particular, it is desired that the low molecular weight component is small for the above reasons. Examples of the polymerization method of the silicone gum 3 include, but are not particularly limited to, polymerization from silanol, addition polymerization and dehydration condensation of polysiloxane terminals with an appropriate catalyst.
Further, the silicone gum 3 is not included in the back layer 8 of the sealant film 1. As described above, since the thermoplastic resin 2 is difficult to slip, the slippage between the back surfaces 5 cannot be said to be good, but when the sealant film 1 is wound or when it is adhered to another substrate and used as a packaging material, Furthermore, when using it for the package mentioned later, the back surfaces 5 do not rub each other. That is, the back surface 5 is rubbed with the front surface 4 when the sealant film 1 is wound. As will be described later, when the sealant film 1 is used as a packaging material, the back surface 5 is adhered to the base material or the adhesive 9. Therefore, even if the silicone gum 3 is not included in the back surface 5, it is possible to obtain proper slipperiness in processing.

  In FIG. 2, the structure of the packaging material 10 formed by adhere | attaching the base material 11 on the back surface 5 of the sealant film 1 is shown. At this time, if the silicone gum 3 is contained in the back surface layer 8 of the sealant film 1, the surface free energy is low, so the adhesiveness between the back surface 5 and the base material 11 is deteriorated, and sufficient adhesive strength is obtained. I can't. Therefore, the silicone gum 3 is not included in the back surface layer 8 of the sealant film 1 according to the present embodiment.

  That is, in the case of the sealant film 1 having a two-layer structure as in the present embodiment, by adding an appropriate amount of the silicone gum 3 to the surface layer 6 and not adding the silicone gum 3 to the back layer 8, the sealant film 1 Stable slipperiness regardless of temperature change, that is, the friction coefficient between the sealant films 1 or between the sealant film 1 and the transport roll can be set to an appropriate value. Furthermore, the heat sealability can be prevented from being lowered, and the adhesive strength with the base material 11 when the packaging material 10 is obtained can be sufficiently obtained.

Below, the detail of each structure in this embodiment is demonstrated.
The sealant film 1 according to the present embodiment may have a two-layer structure of a surface layer 6 and a back layer 8 as shown in FIG. 1, but an intermediate layer 7 between the surface layer 6 and the back layer 8 as shown in FIG. It is good also as a laminated structure of three or more layers. At this time, the content of the silicone gum 3 in the mid layer 7 is not limited.
Further, the silicone gum 3 is dispersed in the thermoplastic resin 2, and the aggregate size of the silicone gum 3 is preferably 5 μm or less at most. When the aggregate size exceeds 5 μm, proper slipperiness cannot be obtained or heat sealability is deteriorated. Moreover, since it also becomes a cause of generation | occurrence | production of the main body (the aggregate of the extrusion material which accumulates on the edge of an extrusion port part), it is not preferable.

(Thermoplastic resin 2)
It is preferable that the material of the thermoplastic resin 2 has an appropriate flexibility and a good workability, for example, a processability by an extruder. Such materials include, for example, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), and homopolymers, random copolymers, and block copolymers. Polypropylene, ethylene vinyl acetate copolymer obtained by copolymerizing the above olefin and vinyl acetate, ethylene-methyl acrylate copolymer (EMA), ethylene-ethyl acrylate copolymer (EEA) obtained by modifying the side chain of olefin , Ethylene-butyl acrylate copolymer (EBA), or ethylene-methacrylic acid copolymer (EMAA). These materials may be used alone, or a plurality of these materials may be used in combination.

In view of rigidity, impact resistance, heat sealability, and tearability, the thermoplastic resin 2 is preferably mainly composed of polyethylene or a derivative thereof.
As shown in FIG. 3, when the sealant film 1 has a three-layer structure, the average density of the surface layer 6, the intermediate layer 7, and the back surface layer 8 is as follows: surface layer 6 ≦ intermediate layer 7, surface layer 6 ≦ It is preferable that the back layer 8 be formed. Further, the surface layer 6, the average density of the intermediate layer 7 and the back surface layer 8, respectively, 0.905 g / cm ³ or more 0.925 g / cm ³ or less, 0.920 g / cm ³ or more 0.940 g / cm ³ or less, It is good in the range of 0.905 g / cm ³ or more and 0.940 g / cm ³ or less. Here, “mainly” means that the resin constituting the packaging sealant film 1 is 70% or more by weight. The average density is measured by a measuring method based on JIS K7112: 1999 or a measuring method comparable to this.

  In general, by using a low-density resin for the thermoplastic resin 2, impact resistance and heat sealability are improved, but rigidity, tearability, slippage during processing, and blocking resistance tend to deteriorate. However, the sealant film 1 has a three-layer structure. For example, the surface layer 6 is a low density resin, the intermediate layer 7 is a medium to high density resin, and the back layer 8 is a low to high density resin. Bending rigidity and tearability can be improved while maintaining good sealing performance. Further, as in this embodiment, the silicone gum 3 is added to the surface layer 6 within the range of 0.25 wt% to 3 wt%, and the silicone gum 3 is not added to the intermediate layer 7 and the back layer 8. Thereby, slip property and adhesiveness with the base material 11 can be made favorable, preventing the fall of heat-sealing property.

At this time, the thickness of the surface layer 6 is preferably about 3 μm to 30 μm. Furthermore, for example, as shown in FIG. 4, the surface layer 6 may be separated into two layers, such as a surface upper layer 6a and a surface lower layer 6b. At this time, the silicone gum 3 may be added only to the upper surface layer 6a, thereby reducing the cost by reducing the amount used.
The intermediate layer 7 or the surface layer 6 may be recycled by adding a so-called end portion that is outside the product width during film formation. Thereby, it is possible to reduce the cost by reducing the material. However, if the silicone gum 3 is included in the back surface layer 8, adhesion failure with the base material 11 occurs, and therefore it is not preferable to add a recycled resin at the end portion. Note that, even with a two-layer structure in which the intermediate layer 7 and the back surface layer 8 are formed of the same resin, the above-described physical property effects can be obtained equally, but care must be taken that the end portions cannot be recycled. .

  The thermoplastic resin 2 may be mixed with linear low density polyethylene (LLDPE) and low density polyethylene (LDPE). By mixing LDPE with LLDPE, the above-mentioned various physical properties and neck-in (a phenomenon in which the width of the film or sheet extruded from the T-die becomes narrower than the effective width of the die when exiting from the die) and fish eyes (surrounding materials) Can be made compatible with workability such as a small spherical lump that is not completely mixed.

(front side, reverse side)
As shown in FIG. 5, when the fine particles 13 are blended in the sealant film 1, a part of the fine particles 13 protrudes on the front surface 4 or the back surface 5. Thus, by providing the projections of the fine particles 13 with irregularities on the front surface 4 or the back surface 5 of the sealant film 1, the contact area can be reduced and good slipperiness can be obtained. Moreover, by doing so, an increase in the contact area of the surface 4 of the sealant film 1 can be prevented, and the blocking resistance is also improved. The surface layer 6 is preferably added with fine particles 13 having an average particle diameter of 7 μm or more and 15 μm or less within a range of 6000 ppm or more and 50000 ppm or less by weight. Further, the back surface layer 8 may be added with fine particles 13 having an average particle diameter of 2 μm or more and 8 μm or less within a range of 1000 ppm or more and 30000 ppm or less by weight. More preferably, the addition amount of the fine particles 13 in the back layer 8 is in the range of 1000 ppm to 10000 ppm. If the average particle diameter of the fine particles 13 added to the surface layer 6 and the back surface layer 8 is too small than the design value or the amount added is too small, the surface 4 and the back surface 5 that are important when winding the sealant film 1 The slipperiness when combined may be deteriorated. Moreover, regarding the packaging material 10, the slipperiness when the surface 4 and the base material 11 that are important when the packaging material 10 is wound may be deteriorated. Further, if the average particle size of the fine particles 13 added to the surface layer 6 is too large or the amount added is too large, heat sealing is caused by the formation of many voids when the sealant films 1 are stacked and thermally welded. There is concern about the decline of sex. Moreover, if the average particle diameter of the fine particles 13 added to the back surface layer 8 is too large or the amount added is too large, the adhesiveness of the packaging material 10 to the base material 11 may be lowered.

  The fine particles 13 are preferably formed of organic or inorganic fine particles harder than the thermoplastic resin 2. By adding the hard organic or inorganic fine particles to form the convex shape 14 protruding from the front surface 4 or the back surface 5, deformation of the convex shape 14 can be suppressed when an external force such as a frictional force is applied. Thereby, an appropriate frictional force can be maintained.

  As shown in FIG. 5, the fine particles 13 may directly form the convex shape 14, or the convex shape 14 may be formed by covering the periphery (surface) of the fine particles 13 with the thermoplastic resin 2. Of course, the fine particles 13 may be substantially buried in the thermoplastic resin 2 and only a part of the fine particles 13 may protrude. The fine particles 13 are preferably spherical. When the convex shape 14 protruding from the front surface 4 or the back surface 5 is not a shape having a curved surface, the surface 4 and the back surface 5 of the sealant film 1 are fitted to each other so that the fitting is effective. The slipperiness can be improved. Furthermore, if the convex shape 14 is a shape having a curved surface, the surface 4 or the back surface 5 of the sealant film 1 that is in close contact is not damaged. In addition, when the pressure is applied, if the convex shape 14 has a curved surface, the pressure is evenly distributed and is difficult to dent, so that an effect can also be expected in blocking resistance.

  Examples of the organic or inorganic fine particles include acrylic particles, styrene particles, styrene acrylic particles and crosslinked products thereof, polyurethane particles, polyester particles, silicone particles, fluorine particles, copolymers thereof, zeolite, Pyrophyllite, talc, smectite, vermiculite, mica, chlorite, kaolin mineral, sepiolite and other clay compound particles, diatomaceous earth, silica, titanium oxide, alumina, silica alumina, zirconia, zinc oxide, strontium oxide, aluminum hydroxide, carbonic acid Examples include strontium, strontium chloride, strontium sulfate, strontium nitrate, strontium hydroxide, and glass particles.

  When organic fine particles are used, it is easy to select an appropriate particle size, but care must be taken in thermal decomposition. The organic fine particles used in this embodiment may have a weight change of 10% or less at a temperature of 300 ° C. This is because when the weight change is large due to heat molding, problems such as generation of odor and burn (discoloration) due to decomposition, and promotion of deterioration of the apparatus may occur.

(Static friction coefficient)
A specific optimum range of the static friction coefficient can be suitably used as long as the static friction coefficient when the front surface 4 and the back surface 5 are combined is in the range of 0.2 to 1.0. More preferably, it is in the range of 0.3 to 0.7. When the coefficient of static friction is less than 0.2, the sealant film 1 is caused to slip too much, meandering of the sealant film 1 or winding failure such as winding deviation, or pitch failure is required when pitch control is required. There are things to do. On the other hand, when the coefficient of static friction is greater than 1.0, slippage is poor, winding failure such as blocking or wrinkling, tension fluctuation, and severe damage to the sealant film 1 may occur.

Moreover, if the storage environment of the sealant film 1 is different, or the elapsed time after taking out from the aging process with heat is different, the static friction coefficient changes. Therefore, a static friction coefficient is good in the range of 0.2 or more and 1.0 or less in the range of 20 to 50 degreeC storage environment. Further, the change in the static friction coefficient due to the temperature difference at this time is preferably 0.5 or less. More preferably, it is 0.2 or less. When the static friction coefficient change due to the temperature difference is larger than 0.5, the slipperiness changes depending on the storage environment and the process, and it is necessary to adjust each time while operating the production equipment, which is not realistic.
Further, the sealant film 1 may contain other various additives. For example, an antioxidant or the like for imparting processing stability can be appropriately added.

(Production method)
The method for producing the sealant film 1 of the present embodiment is not particularly limited, and a known method can be used. Further, the surface layer 6 may be formed by dispersing the silicone gum 3 in the thermoplastic resin 2 to form a film and then cooling it.

  Examples of the dispersion method of the silicone gum 3 include a melt kneading method using a general blender such as a single screw extruder, a twin screw extruder, and a multi-screw extruder, and after dissolving or dispersing and mixing each component. For example, a method of removing the solvent by heating can be used. In consideration of workability, it is preferable to use, for example, a single screw extruder or a twin screw extruder. In the case of using a single screw extruder, for example, a full flight screw, a screw having a mixing element, a barrier flight screw, a fluted screw or the like can be used without particular limitation. The biaxial kneader is not particularly limited to, for example, the same direction rotating twin screw extruder, the different direction rotating twin screw extruder, and the screw shape is a full flight screw or kneading disc type.

  As a film forming method, for example, a film forming method using an extrusion molding machine and a T-die via a feed block or a multi-manifold, or a film forming method using an inflation method can be used. At this time, for example, by using a plurality of extrusion molding machines, the surface layer 6 in which the silicone gum 3 is dispersed and the back layer 8 not including the silicone gum 3 are at least co-extruded to form a layer structure of two or more layers. The sealant film 1 can be obtained.

As a cooling method, it can be used according to the molding machine described above. For example, in the T-die method, an air cooling method such as an air chamber, a vacuum chamber, an air knife, or a water cooling method such as dipping a cooling roll into a cold water pan. There is no particular limitation.
Further, the rear surface 5 can be subjected to a surface modification treatment as necessary. For example, in order to improve printing suitability and laminate suitability when using laminates, such as corona discharge treatment, plasma treatment, flame treatment, etc., a method of expressing functional groups by oxidizing the film surface, coating of an easy adhesion layer, etc. It is possible to suitably use modification by a wet process.

(Packaging material 10)
As shown in FIG. 2, the packaging material 10 having the effects of the present invention can be obtained by bonding the base material 11 to the back surface 5 of the sealant film 1. At this time, as described above, since the silicone gum 3 is not exposed on the back surface 5, the adhesive strength between the back surface 5 and the substrate 11 can be sufficiently obtained. That is, by using the sealant film 1 according to the present embodiment, the packaging material 10 has good heat sealability and sliding property as the packaging material 10, and has high adhesive strength between the sealant film 1 and the substrate 11. Can be obtained. Moreover, although the back surface 5 and the base material 11 may be directly bonded, the back surface 5 and the base material 11 may be bonded via an adhesive 9 as shown in FIG. Even in this case, sufficient adhesive strength can be obtained as described above.

  Examples of the substrate 11 include a material having a support layer that supports the sealant film 1 and a functional layer having a function such as a printing layer or a barrier layer. As the base material 11, for example, a film mainly made of plastic is used, and is appropriately selected depending on use conditions such as the type of contents and the presence or absence of heat treatment after filling. As a material constituting the support layer, for example, polyethylene, polypropylene, polyethylene terephthalate, nylon and the like are used, but are not particularly limited. Further, it may be a single layer made of one of the above materials, or may be a layer in which a plurality of the above materials are combined by stacking such single layers. The barrier layer is a layer having a function of improving the barrier property for protecting the packaging material from a gas such as oxygen contained in the air, water vapor, enclosed contents, and the like. As a material, for example, EVOH (ethylene- Vinyl alcohol copolymer) and metals such as aluminum, and the like can be used as appropriate. 2 shows the packaging material 10 having a two-layer structure of the sealant film 1 and the base material 11. However, the present invention is not limited to this, and the base material 11 may have a multilayer structure in which a plurality of layers are stacked. Good.

  The specific optimum range of the static friction coefficient of the packaging material 10 is also in the range where the static friction coefficient when the surface 4 and the base material 11 are combined is 0.2 or more and 1.0 or less, as in the case of the sealant film 1. If it is, it can be suitably used. More preferably, it is in the range of 0.3 to 0.7. When the coefficient of static friction is less than 0.2, the packaging material 10 slips too much, causing the packaging material 10 to meander, winding failure such as winding misalignment, and pitch control when pitch control is required. Resulting in. On the other hand, when the coefficient of static friction is larger than 1.0, the packaging material 10 is poorly slipped, and winding failure such as blocking or wrinkling occurs, tension fluctuation, and severe packaging material 10 breakage. End up.

  If the storage environment of the packaging material 10 is different, or the elapsed time after taking out from the aging process which applied heat differs, the said static friction coefficient will change. Therefore, a static friction coefficient is good in the range of 0.2 or more and 1.0 or less in the range of 20 to 50 degreeC storage environment. Further, the change in the static friction coefficient due to the temperature difference at this time is preferably 0.5 or less. More preferably, it is 0.2 or less. When the change in the coefficient of static friction due to the temperature difference is larger than 0.5, the slipperiness changes depending on the storage environment and process, and it is necessary to adjust each time while operating the production equipment, which is not realistic.

(Packaging body 12)
By using the packaging material 10 according to the present embodiment and welding the peripheral edges of the sealant films 1 facing each other by heat sealing or the like, the packaging body 12 having the above-described effects of the present invention can be obtained. FIG. 7 schematically shows the configuration of the package 12 formed by welding the peripheral edges of the sealant films 1 facing each other by heat sealing or the like using the packaging material 10 according to the present embodiment. .

Examples of the package 12 according to the present embodiment include a three-sided bag, a jointed bag, a gusset bag, a standing pouch, a pouch with a spout, a pouch with a spout, a pouch with a beak, a lami tube, and a back-in box. In addition, it can be used for various purposes.
As mentioned above, although 1st embodiment of this invention and its modification were shown, this invention is not limited to this embodiment etc. As long as it does not deviate from the technical idea of this embodiment, other layers and structures are arbitrarily selected for the purpose of improving rigidity, strength, impact properties, etc., which are other required physical properties in consideration of the use as a packaging material. Needless to say, it can be formed.

(Effect of this embodiment)
(1) The sealant film 1 according to the present embodiment is composed of at least two layers, and a layer having a surface 4 which is one surface is a surface layer 6, and a layer having a back surface 5 which is the opposite surface to the surface 4 is a back surface. When it is set as the layer 8, the silicone gum 3 is added to the surface layer 6 in the ratio of 0.25 weight% or more and 3 weight% or less with respect to resin which comprises the surface layer 6. FIG. In addition, the silicone gum 3 is not added to the back layer 8.
If it is such a structure, compared with the case outside the said numerical range, the heat seal property and the favorable slipperiness in a process process can be provided to the sealant film 1. FIG.

(2) Moreover, the sealant film 1 which concerns on this embodiment may add the fine particle 13 in the range whose average particle diameter is 7 micrometers or more and 15 micrometers or less to the surface layer 6 within the range of 6000 ppm or more and 50000 ppm or less. Moreover, you may add the microparticles | fine-particles 13 within the range whose average particle diameter is 2 micrometers or more and 8 micrometers or less to the back surface layer 8 within the range of 1000 ppm or more and 10000 ppm or less.
If it is such a structure, compared with the case outside the said numerical range, the slipperiness when the surface 4 and the back surface 5 of the sealant film 1 are match | combined can be made favorable.

(3) Moreover, the sealant film 1 according to the present embodiment further includes an intermediate layer 7 between the surface layer 6 and the back surface layer 8, and the main component of the surface layer 6, the back surface layer 8 and the intermediate layer 7 is polyethylene or The average density of the surface layer 6, the intermediate layer 7, and the back surface layer 8 may be a derivative thereof and satisfy the relational expression of the surface layer 6 ≦ the intermediate layer 7 and the surface layer 6 ≦ the back surface layer 8. Further, the average density of the surface layer 6 and 0.905 g / cm ³ or more 0.925 g / cm ³ within the range, the average density of the intermediate layer 7 0.920 g / cm ³ or more 0.940 g / cm ³ or less of The average density of the back surface layer 8 may be in the range of 0.905 g / cm ³ or more and 0.940 g / cm ³ or less.
If it is such a structure, compared with the case outside the said numerical range, a bending rigidity and tearability can be made favorable, with the impact resistance and heat seal property of the sealant film 1 made favorable.

(4) Moreover, the packaging material 10 which concerns on this embodiment has the base material 11 laminated | stacked on the back surface 5 of the above-mentioned sealant film 1 at least.
If it is such a structure, compared with the case where the silicone gum 3 is added to the back surface layer 8, the adhesive strength of the packaging material 10 on which the base material 11 was laminated | stacked can be raised.
(5) Moreover, the package 12 according to the present embodiment includes the packaging material 10 described above.
If it is such a structure, since the packaging material 10 which raised the adhesive strength of the sealant film 1 and the base material 11 is used, when opening the packaging bag with favorable bag breaking property, airtightness, and the packaging body 12 It is possible to impart properties such as openability.

[First embodiment]
Hereinafter, although the 1st Example of this invention is described in detail, this invention is not limited only to a following example.
The packaging sealant film 1 was a film having a three-layer structure in which a front surface layer 6, an intermediate layer 7, and a back surface layer 8 were laminated. As the thermoplastic resin 2, the surface layer 6 is composed of 95 linear low density polyethylene resin (density 0.913 g / cm ³ , MFR 3.8) and low density polyethylene resin (density 0.924 g / cm ³ , MFR 1.0). : Blended at a ratio of 5 was used. Further, in the intermediate layer 7 and the back layer 8, 95 linear low density polyethylene resin (density 0.931 g / cm ³ , MFR 3.2) and low density polyethylene resin (density 0.924 g / cm ³ , MFR 1.0) are used. : Blended at a ratio of 5 was used. Further, as shown in Tables 1 and 2, the silicone gum 3 and the fine particles 13 were added to the front surface layer 6, the intermediate layer 7, and the back surface layer 8. As the fine particles 13, acrylic crosslinked fine particles were used. In Comparative Examples 1-1 and 1-2, erucic acid amide, which is a general lubricant, was added instead of silicone gum 3. Various examples and comparative examples were prepared by variously changing the addition amount of the silicone gum 3 and the addition amount of erucic acid amide in each layer and the average particle size and addition amount of the fine particles 13. Detailed information is summarized in Tables 1 and 2.

  Each material of the surface layer 6, the intermediate layer 7, and the back surface layer 8 is heated and melted at 260 ° C. by a single-screw co-extruder, and the thickness of the surface layer 6 is 15 μm by the T die casting method. The thickness was 42.5 μm, the thickness of the back layer 8 was 42.5 μm, and the sealant film 1 having a total thickness of 100 μm was formed. In addition, the air chamber system was employ | adopted for cooling.

  The sealant film 1 obtained in each of the above examples and comparative examples was prepared by combining a base material 11 in which a biaxially stretched nylon film having a thickness of 12 μm and a biaxially stretched polyethylene terephthalate film having a thickness of 15 μm were bonded together by dry lamination, and dry laminate Thus, a packaging material 10 was obtained. The order of lamination was the order of nylon film / polyethylene terephthalate film / sealant film 1. As the adhesive, a two-component mixed polyurethane adhesive composed of a main agent and a curing agent was used, and after dry lamination, stored at 50 ° C. for 2 days.

(Performance evaluation)
In order to evaluate the performance of the sealant film 1 and the packaging material 10 obtained in each of the above Examples and Comparative Examples, the slipperiness evaluation and the heat sealability evaluation were performed on the sealant film 1, and the slipping property on the packaging material 10. Evaluation and substrate adhesion evaluation were carried out. The evaluation results are shown in Tables 1 and 2.

(Slip evaluation)
Slip evaluation is performed using the slope method to calculate the static friction coefficient from the angle at which the weight starts to slide when the slope angle is gradually increased using a sliding slope angle measuring device manufactured by Toyo Seiki Seisakusho Co., Ltd. evaluated. The weight used was a metal block of 30 mm width × 40 mm length × 30 mm height and weight 197 g.

Regarding the sealant film 1, the coefficient of static friction when the front surface 4 and the back surface 5 which are important when winding the sealant film 1 are combined, and regarding the packaging material 10, the surface 4 and the base material which are important when winding the packaging material 10. The static friction coefficient when 11 was combined was measured.
When the storage environment of the sealant film 1 is different, the static friction coefficient changes. Therefore, the static friction coefficient when the storage environment is 20 ° C. and the static friction coefficient when the storage environment is 50 ° C. are measured. Calculated.

  The evaluation results indicate that the coefficient of static friction, which is an appropriate slipperiness, is within the range of 0.3 to 0.7, but is not “◯” or “◯”, but is within the range of 0.2 to 1.0. “△” was assigned to those contained in the sample, and “x” was assigned to the other items. In addition, since it is desirable that the slipperiness does not change regardless of the environment, the difference in the coefficient of static friction between 20 ° C. and 50 ° C. is 0.2 or less. Those with 0.5 or less, which have no problem, were marked with “Δ”, and those with more problems were marked with “x”. In addition, since the thing whose static friction coefficient exceeds 1.2 cannot be measured, it describes with "> 1.2".

(Heat sealability evaluation)
The heat sealability was evaluated using a heat sealer (Model No. TP-701-B) manufactured by Tester Sangyo Co., Ltd. with a seal pressure of 0.2 MPa, a seal time of 1 second, a seal width of 10 mm, a seal temperature of 140 ° C., and a sealant. The surfaces on the surface 4 side of the film 1 were overlapped and sealed. The sealed sealant film 1 was cut out to 15 mm width × 100 mm, the distance between chucks was 50 mm, the tensile speed was 300 mm / min, and the T-peel strength was measured using a Shimadzu Corporation tensile tester (model number AGS-500NX). The seal strength was used. A seal strength of 17 [N / 15 mm] or more is “◯”, a seal strength of 15 [N / 15 mm] to 17 [N / 15 mm] is “Δ”, and a seal strength of 15 [N / 15 mm] or less is “X”. It was.

(Substrate adhesion evaluation)
The base material adhesion evaluation evaluated the adhesiveness between the polyethylene terephthalate film / sealant film 1 with respect to the packaging material 10 laminated in the order of nylon film / polyethylene terephthalate film / sealant film 1. First, peeling between both films was performed with a cutter blade with a solvent. About what was able to peel, it made it a trigger and implemented T character peeling using the Shimadzu Corporation tensile tester (model number AGS-500NX). The sample size was 15 mm width × 100 mm, the distance between chucks was 10 mm, and the pulling speed was 300 mm / min.

  The evaluation result was “◯” when the cutter blade could not be peeled off. It was possible to peel off, but it was possible to make it, but it was not peeled between the polyethylene terephthalate film / sealant film 1 at the time of T-peeling. did. A film that could be triggered and peeled even slightly between the polyethylene terephthalate film / sealant film 1 at the time of T-peeling was marked “x”.

(Comprehensive evaluation)
As a comprehensive judgment, all the evaluations of the slipperiness evaluation and the heat sealability evaluation regarding the sealant film 1 and the slipperiness evaluation and the base material adhesion evaluation regarding the packaging material 10 are “O” evaluations, and “O”, One that had a “Δ” evaluation was expressed as “Δ”, and one that had a “×” evaluation was expressed as “×”.

(Evaluation results)
Tables 1 and 2 describe the evaluation results of the sealant film 1 and the packaging material 10 of the above Examples and Comparative Examples.

  From Table 1, the total judgment is “Δ” or more because the addition amount of the silicone gum 3 in the surface layer 6 is 0.25% to 3.00% and the addition amount of the silicone gum 3 in the back layer 8 is 0. The case was 0.00%. In addition, heat seal property falls with the increase in the addition amount of the silicone gum 3 of the surface layer 6, and slipperiness falls with the decrease in the addition amount. For this reason, it is a case where the addition amount of the silicone gum 3 of the surface layer 6 is 0.50% to 2.00% that is more preferably “◯” in the comprehensive judgment. The static friction coefficient of the packaging sealant film 1 and the packaging material 10 at this time is approximately 0.30 to 0.90, and the difference in the static friction coefficient depending on the storage temperature is approximately 0.01 to 0.25. The strength was approximately 16.5 N / 15 mm to 20.0 N / 15 mm.

  However, when the addition amount of the silicone gum 3 in the surface layer 6 is 4% or more, the heat sealability is deteriorated due to the decrease in the heat seal strength, and the addition amount of the silicone gum 3 in the back layer 8 is 0.25% or more. Adhesiveness with the base material 11 deteriorates. Moreover, when the addition amount of the silicone gum 3 of the surface layer 6 and the back surface layer 8 is 0%, the film surface does not slip and the slipperiness deteriorates. In addition, it turns out that the addition amount of the silicone gum 3 of the intermediate | middle layer 7 does not affect film performance, such as slipperiness | lubricity, heat-sealability, and base-material adhesiveness. When erucic acid amide was used as a lubricant, the overall judgment was “x”. This is because in the sealant film 1 and the packaging material 10 using the same, a difference of 0.5 or more was found in the coefficient of static friction depending on the storage temperature.

  From Table 2, the total judgment is “Δ” or more when the addition amount of the fine particles 13 added to the surface layer 6 is 3000 ppm to 70000 ppm and the particle diameter is 3 μm to 20 μm, and the fine particles added to the back surface layer 8. The amount of 13 added was 0 ppm to 30000 ppm, and the particle size was 1 μm to 8 μm. In addition, with the increase in the addition amount of the fine particles 13 and the increase in the particle size, the heat sealability is deteriorated in the surface layer 6, and the adhesiveness with the base material 11 is deteriorated in the back surface layer 8.

  Further, the slipperiness of the front surface layer 6 and the back surface layer 8 decreases with a decrease in the addition amount of the fine particles 13 and a decrease in the particle size. Therefore, it is more preferable that the overall judgment is “◯” when the addition amount of the fine particles 13 added to the surface layer 6 is 6000 ppm to 50000 ppm and the particle diameter is 7 μm to 15 μm, and the fine particles added to the back surface layer 8. The amount of 13 added was 1000 ppm to 30000 ppm, and the particle size was 2 μm to 8 μm.

(Second embodiment)
The packaging sealant film according to the second embodiment of the present invention (hereinafter also simply referred to as “sealant film”) is formed on the surface 4, which is one surface of the packaging sealant film 1, as shown in FIG. The gum 3 is contained in a ratio (surface abundance) of 0.4% or more and 4% or less with respect to the thermoplastic resin 2, and the back surface 5 opposite to the front surface 4 contains the silicone gum 3. Absent.

  As described in the first embodiment, the thermoplastic resin 2 is a material having good impact resistance and low-temperature heat sealability and is not slippery. On the other hand, the silicone gum 3 contained in the surface 4 is a material that has a small surface free energy and is more slippery than the thermoplastic resin 2. Therefore, by setting the surface abundance of the silicone gum 3 within the range of 0.4% or more and 4% or less with respect to the thermoplastic resin 2, good slipperiness can be obtained while maintaining heat sealability. More preferably, the surface abundance of the silicone gum 3 is in the range of 1.0% to 3.0% with respect to the thermoplastic resin 2.

  When the surface abundance of the silicone gum 3 is less than 0.4%, the friction coefficient on the surface 4 becomes large, and it becomes difficult to slip. This is because the contact between the sealant films 1 at the portion where the silicone gum 3 is not exposed increases. As a result, for example, when the sealant film 1 is being transported or when the sealant film 1 is overlapped, the sealant film 1 may be wrinkled, or the sealant film 1 may be stretched due to increased take-up tension. Moreover, blocking resistance will also fall, the sealant films 1 after winding may closely_contact | adhere, and an external appearance nonuniformity, tension fluctuation | variation, or the fracture | rupture of the sealant film 1 may arise.

On the other hand, when the surface abundance of the silicone gum 3 exceeds 4%, the ratio of the thermoplastic resin 2 constituting the sealant film 1 is reduced, and the silicone gum 3 inhibits the pressure bonding when the heat bonding is performed. As a result, the heat sealability may deteriorate.
The silicone according to this embodiment is the same as the silicone described in the first embodiment. Therefore, the description of the first embodiment is omitted here.

Moreover, the silicone gum 3 which concerns on this embodiment is the same as the silicone gum 3 demonstrated by the above-mentioned 1st embodiment. Therefore, the description of the first embodiment is omitted here.
In the present embodiment, the silicone gum 3 is not included in the back surface 5 of the sealant film 1. As explained in the first embodiment, since the thermoplastic resin 2 is difficult to slip, the slippage between the back surfaces 5 cannot be said to be good. However, when the sealant film 1 is wound up, it adheres to the base material 11. When used for the packaging material 10, and further when used for the packaging body 12, the back surfaces 5 do not rub together. That is, the back surface 5 is rubbed with the front surface 4 when the sealant film 1 is wound. When the sealant film 1 is used for the packaging material 10, the back surface 5 is bonded to the base material 11 or the adhesive 9. Therefore, even if the silicone gum 3 is not included in the back surface 5, it is possible to obtain proper slipperiness in processing.

  In FIG. 9, the structure of the packaging material 10 formed by adhere | attaching the base material 11 on the back surface 5 of the sealant film 1 is shown. At this time, if the silicone gum 3 is contained in the back surface 5 of the sealant film 1, the surface free energy is low, so the adhesiveness between the back surface 5 and the base material 11 is deteriorated, and sufficient adhesive strength can be obtained. Can not. Therefore, the silicone gum 3 is not included in the back surface 5 of the sealant film 1 according to this embodiment.

That is, by making an appropriate concentration distribution of the silicone gum 3 as in the present embodiment, the sealant film 1 has a stable slipperiness regardless of aging or temperature change, that is, the sealant films 1 or the sealant film 1. The coefficient of friction between the conveyor roll and the transport roll can be set to an appropriate value. Furthermore, the heat sealability can be prevented from being lowered, and the adhesive strength with the base material 11 when the packaging material 10 is obtained can be sufficiently obtained.
Below, the detail of each structure in this embodiment is demonstrated.

(Distribution of silicone gum 3)
The sealant film 1 according to this embodiment can exhibit an effect if the amount of the silicone gum 3 on the front surface 4 and the back surface 5 is appropriate. For this reason, for example, as shown in FIG. 10, the silicone gum 3 may be included only in the vicinity of the surface 4, or as shown in FIG. 11, the silicone gum 3 is included in the middle of the film. Also good. Of course, as in the first embodiment, as shown in FIG. 1, the silicone gum 3 is included in the surface layer 6 having the front surface 4 and the silicone gum 3 is included in the back surface layer 8 having the back surface 5. A configuration not included may be used. Further, as in the first embodiment, an intermediate layer 7 may be provided between the front surface layer 6 and the back surface layer 8 as shown in FIG. At this time, the content of the silicone gum 3 in the mid layer 7 is not limited.

  The compatibility between the silicone gum 3 and the thermoplastic resin 2 is basically poor. Therefore, when the molten film in which the silicone gum 3 is dispersed is timed at a temperature at which the fluidized state is maintained, the silicone gum 3 and the thermoplastic resin 2 are gradually separated, and the silicone gum 3 dispersed therein is also on the surface 4. Or it is exposed on the back surface 5. That is, the abundance on the surface 4 of the silicone gum 3 can be controlled by controlling the cooling speed. At this time, it is possible to prevent the silicone gum 3 from being exposed to the back surface 5 by bringing another material into close contact with the back surface 5 to eliminate the interface.

Here, the surface abundance of the silicone gum 3 indicates the amount of the silicone gum 3 present from the surface 4 to a depth of several nanometers to several microns.
The method for evaluating the surface abundance of the silicone gum 3 is not particularly limited. For example, vibrational spectroscopy such as infrared spectroscopy and Raman spectroscopy, Auger electron spectroscopy and energy dispersive X-ray spectroscopy. Electron microscope observation / analysis method, photoelectron spectroscopy such as X-ray photoelectron spectroscopy, and the like can be used.

  Further, the silicone gum 3 is dispersed in the thermoplastic resin 2, and the aggregate size of the silicone gum 3 is preferably 5 μm or less at most. When the aggregate size exceeds 5 μm, proper slipperiness cannot be obtained or heat sealability is deteriorated. Moreover, since it also becomes a cause of generation | occurrence | production of the main body (the aggregate of the extrusion material which accumulates on the edge of an extrusion port part), it is not preferable.

(Thermoplastic resin 2)
The thermoplastic resin 2 according to the present embodiment is the same as the thermoplastic resin 2 described in the first embodiment. Therefore, the description of the first embodiment is omitted here.
As in the first embodiment, when considering rigidity, impact resistance, heat sealability, and tearability, the thermoplastic resin 2 is preferably mainly composed of polyethylene or a derivative thereof. Similarly to the first embodiment, the sealant film 1 has a three-layer structure as shown in FIG. 3, and the average density of the surface layer 6, the intermediate layer 7, and the back layer 8 is the surface layer 6 ≦ intermediate layer 7. The surface layer 6 ≦ the back surface layer 8 is preferably satisfied. Further, the surface layer 6, the average density of the intermediate layer 7 and the back surface layer 8, respectively, 0.905 g / cm ³ or more 0.925 g / cm ³ or less, 0.920 g / cm ³ or more 0.940 g / cm ³ or less, It is good in the range of 0.905 g / cm ³ or more and 0.940 g / cm ³ or less. Here, “mainly” means that the resin constituting the sealant film 1 is 70% or more by weight. The average density is measured by a measuring method based on JIS K7112: 1999 or a measuring method comparable to this.

(front side, reverse side)
The surface 4 is preferably provided with irregularities in the arithmetic mean roughness Ra (JISB0601-2001) in the range of 0.6 μm to 2.3 μm. Moreover, the back surface 5 is good to have the unevenness | corrugation in arithmetic mean roughness Ra (JISB0601-2001) in the range of 0.2 micrometer or more and 1.2 micrometers or less.

  When the arithmetic average roughness Ra of the surface 4 is less than 0.6 μm or the arithmetic average roughness Ra of the back surface 5 is less than 0.2 μm, the static friction when the important surface 4 and the back surface 5 are combined when the sealant film 1 is wound up. The coefficient may increase and the slipperiness may deteriorate, and the slipperiness when the storage temperature is changed may change. On the other hand, when the arithmetic average roughness Ra of the surface 4 exceeds 2.3 μm, when the sealant films 1 are stacked and thermally welded, a large number of voids are created, which may reduce the heat sealability. is there. In addition, when the arithmetic average roughness Ra of the back surface 5 exceeds 1.2 μm, the adhesive strength is lowered by forming a lot of voids when the sealant film 1 and the base material 11 are bonded to obtain the packaging material 10. May end up.

In addition, the unevenness | corrugations of the surface 4 and the back surface 5 may each be formed with the thermoplastic resin 2, and may be formed with the organic type or inorganic type microparticles | fine-particles different from the thermoplastic resin 2. FIG.
The organic or inorganic fine particles that can be used in the present embodiment are the same as the organic or inorganic fine particles described in the first embodiment. Therefore, the description of the first embodiment is omitted here.

  In the case where irregularities are formed by the thermoplastic resin 2, it is not necessary to separately prepare organic or inorganic fine particles, so that the cost can be reduced in terms of materials and management. In addition, when the fine particles 13 are added, it is difficult to add the shape of the target height or size. However, when the irregularities are formed by the thermoplastic resin 2, the target height or It is possible to add size shapes. Thereby, the shape as needed, such as transparency, slipperiness, and blocking resistance, can be added. However, it is possible to obtain a sufficiently uneven shape even with a mat roll of a rubber roll, for example, without producing a die that is purposely aimed.

(Static friction coefficient)
The specific optimum static friction coefficient range in the present embodiment is the same as the optimum static friction coefficient range described in the first embodiment. Therefore, the description of the first embodiment is omitted here.
Moreover, the various other additives may be contained in the sealant film 1 which concerns on this embodiment similarly to 1st embodiment. For example, an antioxidant or the like for imparting processing stability can be appropriately added.

(Production method)
The method for producing the sealant film 1 of the present embodiment is not particularly limited, and a known method can be used. The sealant film 1 may be formed by dispersing the silicone gum 3 in the thermoplastic resin 2 to form a film and then cooling it. That is, the manufacturing method of the sealant film 1 according to the present embodiment is substantially the same as the manufacturing method of the sealant film 1 described in the first embodiment. Therefore, a part different from the description of the first embodiment will be described here, and the description of the rest will be omitted.

The method for dispersing the silicone gum 3 according to the present embodiment is the same as the method for dispersing the silicone gum 3 described in the first embodiment. Therefore, the description of the first embodiment is omitted here.
The film forming method according to the present embodiment is the same as the film forming method described in the first embodiment. Therefore, the description of the first embodiment is omitted here.

  Note that, when the single-layer sealant film 1 is formed as in the present embodiment, since the compatibility between the silicone gum 3 and the thermoplastic resin 2 is poor as described above, the molten film in which the silicone gum 3 is dispersed is used. It is possible to bleed the silicone gum 3 on the surface 4 by slowly cooling. At this time, by bringing another material into close contact with the back surface 5, there is no interface, and bleeding to the back surface 5 can be suppressed. Further, there is no problem even in a method of applying the silicone gum 3 to the surface 4 by coating the surface with a coating solution containing the silicone gum 3 after obtaining the sealant film to which the silicone gum 3 is not added.

The cooling method according to the present embodiment is the same as the cooling method described in the first embodiment. Therefore, the description of the first embodiment is omitted here.
In addition, when adding the fine particles 13 as irregularities on the front surface 4 and the back surface 5, the fine particles 13 need to be present on the front surface 4 or the back surface 5. The method of pressure bonding is not preferable. On the other hand, when adding the said unevenness | corrugation with the thermoplastic resin 2, the method of crimping | bonding with metal rolls and a metal-rubber roll is preferable. In addition, when the unevenness is added by the thermoplastic resin 2, there is of course no problem even if the shape is added by hot pressing or the like.

  Also in the present embodiment, as in the first embodiment, the rear surface 5 can be subjected to surface modification treatment as necessary. For example, in order to improve printing suitability and laminate suitability when using laminates, such as corona discharge treatment, plasma treatment, flame treatment, etc., a method of expressing functional groups by oxidizing the film surface, coating of an easy adhesion layer, etc. It is possible to suitably use modification by a wet process.

(Packaging material 10)
As shown in FIG. 9, the packaging material 10 having the effects of the present invention can be obtained by bonding the base material 11 to the back surface 5 of the sealant film 1. At this time, as described above, since the silicone gum 3 is not exposed on the back surface 5, the adhesive strength between the back surface 5 and the substrate 11 can be sufficiently obtained. That is, by using the sealant film 1 according to the present embodiment, the packaging material 10 has good heat sealability and sliding property as the packaging material 10, and has high adhesive strength between the sealant film 1 and the substrate 11. Can be obtained. Moreover, although the back surface 5 and the base material 11 may be directly bonded, the back surface 5 and the base material 11 may be bonded via an adhesive 9 as shown in FIG. Even in this case, sufficient adhesive strength can be obtained as described above.

The base material 11 according to the present embodiment is the same as the base material 11 described in the first embodiment. Therefore, the description of the first embodiment is omitted here.
Moreover, the range of the specific optimum static friction coefficient of the packaging material 10 according to the present embodiment is also the same as the range of the optimum static friction coefficient of the packaging material 10 described in the first embodiment. Therefore, the description of the first embodiment is omitted here.

(Packaging body 12)
In the present embodiment, as in the first embodiment described above, by using the packaging material 10 according to the present embodiment, the peripheral edges of the sealant films 1 facing each other are welded together by heat sealing or the like, thereby achieving the effects of the present invention described above. Can be obtained.
The package 12 according to this embodiment is the same as the package 12 described in the first embodiment. Therefore, the description of the first embodiment is omitted here.
As mentioned above, although 2nd embodiment of this invention and its modification were shown, this invention is not limited to this embodiment. As long as it does not deviate from the technical idea of this embodiment, other layers and structures are arbitrarily selected for the purpose of improving rigidity, strength, impact properties, etc., which are other required physical properties in consideration of the use as a packaging material. Needless to say, it can be formed.

(Effect of this embodiment)
(1) The sealant film 1 according to the present embodiment has a surface 4 which is one surface containing the silicone gum 3 in a proportion of 0.4% or more and 4% or less with respect to the thermoplastic resin 2. Silicone gum 3 is not included in the back surface 5 opposite to 4.
If it is such a structure, compared with the case outside the said numerical range, the heat seal property and the favorable slipperiness in a process process can be provided to the sealant film 1. FIG.

(2) Moreover, the sealant film 1 according to the present embodiment forms irregularities in the surface 4 having an arithmetic average roughness Ra of 0.6 μm or more and 2.3 μm or less, and the back surface 5 has an arithmetic average roughness Ra. Concavities and convexities in the range of 0.2 μm or more and 1.2 μm may be formed.
If it is such a structure, compared with the case outside the said numerical range, the static friction coefficient when the surface 4 and the back surface 5 of the sealant film 1 are match | combined can be reduced. Therefore, good slipperiness can be imparted to the sealant film 1.
Moreover, if it is such a structure, compared with the case outside the said numerical range, the quantity of the space | gap which generate | occur | produces when the sealant films 1 are heat-welded can be reduced. Therefore, good heat sealability can be imparted to the sealant film 1.

(3) Moreover, the sealant film 1 according to the present embodiment is composed of at least three layers, a surface layer 6 having a surface 4, a layer having a back surface 5 as a back layer 8, the surface layer 6 and the back layer 8, When the intermediate layer 7 is a layer located between the surface layer 6, the back layer 8 and the intermediate layer 7 are mainly composed of polyethylene or a derivative thereof, and the respective average densities of the surface layer 6, the intermediate layer 7 and the back layer 8 May satisfy the relational expression of the surface layer 6 ≦ the intermediate layer 7 and the surface layer 6 ≦ the back layer 8. Further, the average density of the surface layer 6 and 0.905 g / cm ³ or more 0.925 g / cm ³ within the range, the average density of the intermediate layer 7 0.920 g / cm ³ or more 0.940 g / cm ³ or less of The average density of the back surface layer 8 may be in the range of 0.905 g / cm ³ or more and 0.940 g / cm ³ or less.
If it is such a structure, compared with the case outside the said numerical range, a bending rigidity and tearability can be made favorable, with the impact resistance and heat seal property of the sealant film 1 made favorable.

(4) Moreover, the packaging material 10 which concerns on this embodiment has the base material 11 laminated | stacked on the back surface 5 of the above-mentioned sealant film 1 at least.
If it is such a structure, compared with the case where the silicone gum 3 is contained in the back surface 5, the adhesive strength of the packaging material 10 on which the base material 11 was laminated | stacked can be improved.
(5) Moreover, the package 12 according to the present embodiment includes the packaging material 10 described above.
If it is such a structure, since the packaging material 10 which improved the adhesive strength of the sealant film 1 and the base material 11 is used, the favorable bag breaking property can be provided to the package body 12. FIG.

[Second Example]
Hereinafter, although the 2nd example of the present invention is described in detail, the present invention is not limited only to the following example.
The packaging sealant film 1 was a film having a three-layer structure in which a front surface layer 6, an intermediate layer 7, and a back surface layer 8 were laminated. As the thermoplastic resin 2, the surface layer 6 is composed of 95 linear low density polyethylene resin (density 0.913 g / cm ³ , MFR 3.8) and low density polyethylene resin (density 0.924 g / cm ³ , MFR 1.0). : Blended at a ratio of 5 was used. Further, in the intermediate layer 7 and the back layer 8, 95 linear low density polyethylene resin (density 0.931 g / cm ³ , MFR 3.2) and low density polyethylene resin (density 0.924 g / cm ³ , MFR 1.0) are used. : Blended at a ratio of 5 was used. Further, as shown in Tables 3 and 4, the silicone gum 3 and the fine particles 13 were added to the front surface layer 6, the intermediate layer 7, and the back surface layer 8. As the fine particles 13, acrylic crosslinked fine particles were used. In Comparative Examples 2-1 and 2-2, erucic acid amide, which is a general lubricant, was added instead of silicone gum 3. Various examples and comparative examples were prepared by variously changing the addition amount of the silicone gum 3 and the addition amount of erucic acid amide in each layer and the average particle size and addition amount of the fine particles 13. Detailed information is summarized in Tables 3 and 4.

  Each material of the surface layer 6, the intermediate layer 7, and the back surface layer 8 is heated and melted at 260 ° C. by a single-screw co-extruder, and the thickness of the surface layer 6 is 15 μm by the T die casting method. The thickness was 42.5 μm, the thickness of the back layer 8 was 42.5 μm, and the sealant film 1 having a total thickness of 100 μm was formed. In addition, the air chamber system was employ | adopted for cooling.

  As another example, Table 5 shows an example in which unevenness is formed on the front surface 4 and the back surface 5 by the thermoplastic resin 2. The method for producing the sealant film 1 was the same as that in each of the above examples except that the fine particles 13 were not added and the cooling method was changed. As a cooling system, a cooling roll matted on the surface 4 was used, and the molten resin discharged from the T-die was cooled while being directly shaped by applying pressure so that the molten resin was sufficiently adhered to the cooling roll by the nip roll. The mat-processed cooling roll side was the front surface 4 and the nip roll side was the back surface 5. A Teflon (registered trademark) roll was used as the nip roll.

  The sealant film 1 obtained in each of the above examples and comparative examples was prepared by combining a base material 11 in which a biaxially stretched nylon film having a thickness of 12 μm and a biaxially stretched polyethylene terephthalate film having a thickness of 15 μm were bonded together by dry lamination, and dry laminate Thus, a packaging material 10 was obtained. The order of lamination was the order of nylon film / polyethylene terephthalate film / sealant film 1. As the adhesive, a two-component mixed polyurethane adhesive composed of a main agent and a curing agent was used, and after dry lamination, stored at 50 ° C. for 2 days.

(Production film form measurement)
In order to evaluate the form of the sealant film 1 and the packaging material 10 obtained in each of the above Examples and Comparative Examples, the abundance measurement and the unevenness observation measurement of the silicone gum 3 on the front surface 4 and the back surface 5 of the sealant film 1 were performed. . The measurement results are shown in Tables 3-5.

(Measurement of abundance of silicone gum 3)
As a measuring device, a Fourier transform infrared spectrophotometer (model number FT / IR-6000) manufactured by JASCO Corporation was used. For the measurement, a Ge prism, a single reflection type ATR method was adopted. Hereinafter, a method for measuring the abundance of the silicone gum 3 will be described.

First, the infrared absorption spectrum of the silicone gum 3 itself and the infrared absorption spectrum of polyethylene itself as the thermoplastic resin 2 were measured, and the peak intensity (Is, Ip) derived from each structure was calculated. In this case, the peak intensity of Si—O stretching vibration near 1090 cm ⁻¹ is Is, and the peak intensity of CH ₂ stretching vibration near 2850 cm ⁻¹ is Ip. Next, the infrared absorption spectrum of the sealant film 1 of each example and each comparative example was measured, and the ratio x of the peak intensity derived from the silicone gum 3 to the peak intensity derived from polyethylene was measured. From these results, α represented by the following formula 1 was calculated.
α = {(Ip / Is) × x} / {1+ (Ip / Is) × x} Equation 1
This α is the abundance ratio (surface abundance) of the silicone gum 3.

(Unevenness observation measurement)
As a measuring device, a laser microscope (model number VK-X200) manufactured by Keyence Corporation was used. The magnification of the objective lens was set to 10 times, the front surface 4 and the back surface 5 were measured, and the arithmetic average roughness Ra (JISB0601-2001) was measured. The measurement range was 1 mm ² .

(Performance evaluation)
In order to evaluate the performance of the sealant film 1 and the packaging material 10 obtained in each of the above Examples and Comparative Examples, the slipperiness evaluation and the heat sealability evaluation were performed on the sealant film 1, and the slipping property on the packaging material 10. Evaluation and substrate adhesion evaluation were carried out. Each evaluation result is shown in Tables 3-5.

(Slip evaluation)
Slip evaluation is performed using the slope method to calculate the static friction coefficient from the angle at which the weight starts to slide when the slope angle is gradually increased using a sliding slope angle measuring device manufactured by Toyo Seiki Seisakusho Co., Ltd. evaluated. The weight used was a metal block of 30 mm width × 40 mm length × 30 mm height and weight 197 g.

Regarding the sealant film 1, the coefficient of static friction when the front surface 4 and the back surface 5 which are important when winding the sealant film 1 are combined, and regarding the packaging material 10, the surface 4 and the base material which are important when winding the packaging material 10. The static friction coefficient when 11 was combined was measured.
When the storage environment of the sealant film 1 is different, the static friction coefficient changes. Therefore, the static friction coefficient when the storage environment is 20 ° C. and the static friction coefficient when the storage environment is 50 ° C. are measured. Calculated.

  The evaluation results indicate that the coefficient of static friction, which is an appropriate slipperiness, is within the range of 0.3 to 0.7, but is not “◯” or “◯”, but is within the range of 0.2 to 1.0. “△” was assigned to those contained in the sample, and “x” was assigned to the other items. In addition, since it is desirable that the slipperiness does not change regardless of the environment, the difference in the coefficient of static friction between 20 ° C. and 50 ° C. is 0.2 or less. Those having a problem of 0.5 or less were evaluated as “Δ”, and those having a problem of less than “×”. In addition, since the thing whose static friction coefficient exceeds 1.2 cannot be measured, it describes with "> 1.2".

(Heat sealability evaluation)
The heat sealability was evaluated using a heat sealer (model number TP-701-B) manufactured by Tester Sangyo Co., Ltd. with a seal pressure of 0.2 MPa, a seal time of 1 second, a seal width of 10 mm, a seal temperature of 140 ° C., and a sealant film 1 The surfaces on the surface 4 side were stacked and sealed. The sealed sealant film 1 was cut out to 15 mm width × 100 mm, the distance between chucks was 50 mm, the tensile speed was 300 mm / min, and the T-peel strength was measured using a Shimadzu Corporation tensile tester (model number AGS-500NX). The seal strength was used. A seal strength of 17 [N / 15 mm] or more is “◯”, a seal strength of 15 [N / 15 mm] to 17 [N / 15 mm] is “Δ”, and a seal strength of 15 [N / 15 mm] or less is “X”. It was.

(Substrate adhesion evaluation)
The base material adhesion evaluation evaluated the adhesiveness between the polyethylene terephthalate film / sealant film 1 with respect to the packaging material 10 laminated in the order of nylon film / polyethylene terephthalate film / sealant film 1. First, peeling between both films was performed with a cutter blade with a solvent. About what was able to peel, it made it a trigger and implemented T character peeling using the Shimadzu Corporation tensile tester (model number AGS-500NX). The sample size was 15 mm width × 100 mm, the distance between chucks was 10 mm, and the pulling speed was 300 mm / min.

  The evaluation result was “◯” when the cutter blade could not be peeled off. It was possible to peel off, but it was possible to make it, but it was not peeled between the polyethylene terephthalate film / sealant film 1 at the time of T-peeling. did. A film that could be triggered and peeled even slightly between the polyethylene terephthalate film / sealant film 1 at the time of T-peeling was marked “x”.

(Comprehensive evaluation)
As a comprehensive judgment, all the evaluations of the slipperiness evaluation and the heat sealability evaluation regarding the sealant film 1 and the slipperiness evaluation and the base material adhesion evaluation regarding the packaging material 10 are “O” evaluations, and “O”, One that had a “Δ” evaluation was expressed as “Δ”, and one that had a “×” evaluation was expressed as “×”.

(Evaluation results)
The evaluation results of the sealant film 1 and the packaging material 10 of the above examples and comparative examples are shown in Tables 3 to 5.

  As a result of Comparative Examples 2-1 and 2-2 in Table 3, it can be seen that when erucic acid amide, which is a general lubricant, is added, the change in slipperiness due to temperature is increased regardless of the addition amount. On the other hand, in Examples 2-1 and 2-2, both the heat sealability and the base material adhesion evaluation including the result of the slipperiness evaluation were good, and the overall evaluation was “◯”. In Examples 2-1 and 2-2, as a result of adding 1% of the silicone gum 3 to the surface layer 6, 1.6% of the silicone gum 3 is present on the surface 4, and the silicone gum 3 is present on the back surface layer 8. As a result of not adding silicone, no silicone gum is present on the back surface 5. Although 1% of silicone gum 3 was added to the intermediate layer 7 of Example 2-2, it was confirmed that the surface abundance of the silicone gum 3 did not change on the front surface 4 and the back surface 5, and there was no difference in performance. did it.

  In Examples 2-1, 2-3, 2-4, 2-5, 2-6, 2-7 and Comparative Examples 2-3, 2-4, the amount of the silicone gum 3 added to the surface layer 6 was changed. However, it can be seen that the amount of the silicone gum 3 present on the surface 4 also changes linearly accordingly. At this time, Comparative Example 2-3 in which the surface abundance of the silicone gum 3 exceeds 4% is heat sealability, and Comparative Example 2-4 in which the silicone gum 3 is less than 0.4% is NG, respectively. It turns out that it has become "x" as evaluation.

  In Example 2-1 and Comparative Examples 2-5, 2-6, and 2-7, the addition amount of the silicone gum 3 to be added to the back surface layer 8 is changed, and accordingly, the silicone present in the back surface 5 is changed. The amount of gum 3 also varies linearly. As a result, when the silicone gum 3 was present on the back surface 5, the base material adhesion became NG. In particular, Comparative Example 2-5 was weak in substrate adhesion, and peeling progressed between the polyethylene terephthalate film / sealant film 1, but Comparative Example 2-7 peeled slightly between the polyethylene terephthalate film / sealant film 1, and immediately This is a result of the polyethylene terephthalate film breaking. For this reason, it has been found that the smaller the amount of the back surface 5 of the silicone gum 3 is, the better.

  Table 5 is an example in which the irregularities of the front surface 4 and the back surface 5 are made of the thermoplastic resin 2 and the formulation of the silicone gum 3 is the same as in Table 3, but the evaluation results are almost the same as in Table 3. I know that there is. That is, it is possible to improve the slipping property, the heat sealing property, and the base material adhesion property by making the abundance of the front surface 4 and the back surface 5 of the silicone gum 3 appropriate, regardless of the method for producing the unevenness. is there.

  Table 4 shows an example in which the unevenness of the front surface 4 and the back surface 5 is created by the fine particles 13. Various irregularities, that is, the arithmetic average roughness Ra is changed by changing the particle diameter and the addition amount of the fine particles 13. It can be seen that the amount of silicone gum 3 added is not changed and there is a deviation of 0.1 due to measurement errors, but the surface abundance of silicone gum 3 remains unchanged.

  From the results of Examples 2-1, 2-8, 2-9, 2-10, 2-11, 2-12, 2-13, 2-14, 2-15, 2-16, 2-17, the surface It can be seen that when the arithmetic average roughness Ra value of 4 exceeds 2.3 μm, the heat sealability deteriorates and becomes “Δ”. It can also be seen that when the Ra value is less than 0.6 μm, the slipperiness deteriorates and becomes “Δ”. Therefore, the degree of unevenness on the surface 4 is preferably such that the arithmetic average roughness is 0.6 μm to 2.3 μm. Further, from the results of Examples 2-1, 2-18, 2-19, 2-20, 2-21, 2-22, 2-23, and 2-24, the Ra value of the back surface 5 is less than 0.2. If it becomes, slipperiness will deteriorate and will be set as "△". Moreover, although it was not implemented to the range where Ra value is too large, it was confirmed that there was no problem at least up to 1.2 μm confirmed this time. If there are more irregularities than this, there is a concern that the adhesion of the substrate will be reduced, and a large amount of fine particles 13 must be added, leading to an increase in cost and no merit.

1 Sealant film for packaging (sealant film)
2 Thermoplastic resin 3 Silicone gum 4 Surface 5 Back surface 6 Surface layer 7 Intermediate layer 8 Back surface layer 9 Adhesive 10 Packaging material 11 Base material 12 Packaging body 13 Fine particles

Claims (8)

In a sealant film for packaging consisting of at least two layers,
When a layer having a surface that is one surface is a surface layer, a layer having a back surface that is opposite to the surface is a back layer,
Silicone gum is added to the surface layer in a proportion of 0.25 wt% to 3 wt% with respect to the resin constituting the surface layer,
A packaging sealant film, wherein the silicone gum is not added to the back layer. In the surface layer, fine particles having an average particle diameter of 7 μm or more and 15 μm or less are added within a range of 6000 ppm or more and 50000 ppm or less,
2. The packaging sealant film according to claim 1, wherein fine particles having an average particle diameter of 2 μm or more and 8 μm or less are added to the back surface layer within a range of 1000 ppm or more and 10,000 ppm or less. An intermediate layer disposed between the front surface layer and the back surface layer;
Each of the surface layer, the back layer and the intermediate layer contains polyethylene or a derivative thereof as a main component,
Each average density of the surface layer, the intermediate layer and the back layer is
Satisfies the relational expression of surface layer ≦ intermediate layer, surface layer ≦ back surface layer, and
The average density of the surface layer is in the range of 0.905 g / cm ³ or more 0.925 g / cm ³ or less,
The average density of the intermediate layer is within a range of 0.920 g / cm ³ or more and 0.940 g / cm ³ or less,
^3. The packaging sealant film according to claim 1, wherein an average density of the back surface layer is in a range of 0.905 g / cm ³ or more and 0.940 g / cm ³ or less. On the surface of the surface layer that is one surface, silicone gum is contained in a proportion of 0.4% or more and 4% or less with respect to the thermoplastic resin,
Silicone gum is not contained in the surface of the back surface layer which is the surface opposite to the said surface layer, The sealant film for packaging characterized by the above-mentioned. The surface is provided with irregularities having an arithmetic average roughness Ra (JISB0601-2001) in the range of 0.6 μm or more and 2.3 μm or less,
5. The packaging sealant film according to claim 4, wherein unevenness having an arithmetic average roughness Ra (JISB0601-2001) in a range of 0.2 μm to 1.2 μm is formed on the back surface. The packaging sealant film comprises at least three layers,
When the layer having the surface is a surface layer, the layer having the back surface is a back layer, and the layer located between the surface layer and the back layer is an intermediate layer,
Each of the surface layer, the back layer and the intermediate layer contains polyethylene or a derivative thereof as a main component,
Each average density of the surface layer, the intermediate layer and the back layer is
Satisfies the relational expression of surface layer ≦ intermediate layer, surface layer ≦ back surface layer, and
The average density of the surface layer is in the range of 0.905 g / cm ³ or more 0.925 g / cm ³ or less,
The average density of the intermediate layer is within a range of 0.920 g / cm ³ or more and 0.940 g / cm ³ or less,
6. The packaging sealant film according to claim 4, wherein an average density of the back surface layer is within a range of 0.905 g / cm ³ or more and 0.940 g / cm ³ or less.   A packaging material, wherein at least a base material is laminated on the back surface of the packaging sealant film according to any one of claims 1 to 6.   A package comprising the packaging material according to claim 7.

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