JP6801351B2 - Laminated film with good slipperiness and blocking resistance, and packaging materials and packaging materials using this - Google Patents

Description

The present invention relates to a laminated film having good slipperiness and blocking resistance.

Packaging materials are widely used in packaging bags for foods and daily necessities, and the contents of the packaging bags are in various states such as liquid, powder, paste, and solid. The packaging bag is required to have characteristics such as filling suitability when filling the contents, no damage to the bag when an external force is applied to the packaging material, airtightness, and openability when opening the packaging bag. In order to obtain such properties, a thermoplastic resin laminated film used for a packaging material is required to have physical properties such as impact resistance, heat sealability, tearability, and rigidity.

When a low-density polyethylene is used, for example, the laminated film of the thermoplastic resin can have good impact resistance and low-temperature heat-sealing property, but has problems such as poor slipperiness in the processing process and easy blocking. .. Poor slipperiness causes wrinkles during processing and poor film winding, and blocking causes the appearance of blocking marks and the decrease in yield due to film breakage and tension fluctuations during printing and laminating processes. That is, the slipperiness and blocking property lead to a decrease in operability, a poor appearance of the obtained product, and a deterioration in openness, and a lubricant or an anti-blocking agent is used to improve these.

In order to solve these problems of slipperiness and blocking property, measures are taken to add a lubricant or an antiblocking agent to low-density polyethylene or the like. (For example, refer to Patent Document 1 etc.)

JP-A-2007-125735

Until now, in order to improve the slipperiness and openness of films and bag-making products, measures have been taken in the direction of increasing the amount of lubricant and antiblocking agent added. For example, in Patent Document 1 described above, at least 500 to 1500 ppm of an organic lubricant is blended in the seal layer of the polyethylene-based resin laminated film. However, when a large amount of lubricant is added, a large amount of bleed-out occurs in which the lubricant precipitates on the film surface after film formation, so that the film slips too much during the post-processing process, causing misalignment and sealing between films. There were problems such as lowering the sex.

Therefore, in the present invention, in order to reduce the bleed-out of the lubricant, the amount of the inorganic or organic fine particles and the lubricant added is adjusted to improve the long-term slip stability and blocking resistance from the film formation to the post-processing process. It is an object of the present invention to provide a laminated film of a thermoplastic resin used for a packaging bag or the like.

In order to solve the above problems, one of the representative laminated films of the present invention is a laminated film consisting of at least two layers, and the first layer, which is the outermost layer, contains 6000 fine particles having an average particle size of 7 to 15 μm. The second layer contains 1000 to 10000 ppm of fine particles having an average particle size of 2 to 8 μm, and the first and second layers both contain 30 to 200 ppm of lubricant. Contains.

Since the amount of the lubricant added to the laminated film of the present invention is small, the change in the elapsed time of slipperiness in the post-processing step of the film is small, and good blocking resistance can be obtained.

Further, since the laminated film of the present invention has a small amount of lubricant added, it leads to cost reduction at the time of film production.

It is a perspective view which showed an example of the Embodiment of this invention. It is sectional drawing which showed an example of the Embodiment of this invention. It is a perspective view which showed an example of the Embodiment of this invention. It is a perspective view which showed an example of the Embodiment of this invention. It is a perspective view which showed an example of the Embodiment of this invention. It is sectional drawing of the standing pouch using the packaging material of this invention. It is a development view of the standing pouch using the packaging material of this invention.

The details of each configuration in this embodiment will be described below. It should be noted that each figure is a diagram schematically shown, and the size and shape of each part are exaggerated as appropriate for easy understanding. Further, for simplification of explanation, the same reference numerals are given to the corresponding parts in each figure.

When the fine particles are mixed with the laminated film 1 as shown in FIG. 2, a part of the fine particles protrudes on the surface 2 on the first layer 4 side. As described above, the surface of the film can be made uneven by the protruding portion of the fine particles contained in the laminated film 1 and the flat portion of the surface of the outermost layer on which the fine particles do not protrude. Due to the unevenness of the film surface, the contact area between the films when the films are placed on top of each other can be reduced, and good slipperiness can be obtained. Even when the packaging material 11 using such a laminated film 1 is stored in a rolled state for a long period of time, it is possible to prevent an increase in the contact area on the surface of the film, so that the blocking resistance is also improved.
However, if the proportion of the protrusions of the fine particles on the surface 2 of the outermost surface layer of the laminated film 1 becomes too high as the particle size and the amount of the fine particles to be added increase, the heat sealability deteriorates and the appearance of the film is deteriorated. It leads to unevenness. Further, as the particle size and the amount of the inorganic or organic fine particles to be blended decrease, the slipperiness between the surfaces 2 of the laminated film 1 decreases, which leads to a problem such as blocking.
Therefore, by blending 6000 to 50,000 ppm of organic fine particles 6 having an average particle size of 7 to 15 μm in the first layer 4, appropriate slipperiness and blocking property can be obtained.

As described above, a part of the fine particles to be blended in the second layer 5 protrudes to the back surface 3 on the second layer 5 side, so that the slipperiness and blocking property of the film surface can be improved. However, as the particle size and the amount of the organic or inorganic fine particles to be blended increase, when the laminated film 1 of the thermoplastic resin is used as the packaging material, the inorganic or organic fine particles protruding on the back surface 3 on the second layer side are formed. , The adhesion to the base material layer is deteriorated, and the Lami strength of the packaging material described later is lowered. Further, as the particle size and the amount of the organic or inorganic fine particles to be blended decrease, the slipperiness and blocking property of the back surface 3 on the second layer 5 side are deteriorated.
Therefore, by blending 1000 to 10000 ppm of inorganic fine particles 7 having an average particle size of 2 to 8 μm in the second layer 5, when the packaging material 11 is used, the adhesion with the base material layer is maintained and the Lami strength is maintained. However, slipperiness and blocking resistance can be improved.

As the amount of the lubricant added, about 30 ppm to 200 ppm, which can obtain a laminated film 1 of a thermoplastic resin having appropriate slipperiness and no change under any conditions, is sufficient. Although it changes depending on the type of thermoplastic resin, the presence / absence / type of adhesive, temperature conditions, etc., the lubricant bleeds out due to changes over time after molding or changing the temperature. Therefore, depending on the conditions, the amount of lubricant present on the surface of the packaging film changes, and as a result, the slipperiness changes. Further, not only that, there is a problem that the lubricant is transferred to the film in contact with the surface and the slipperiness of the film is changed. Generally, a large amount of lubricant is added to make the film slippery, but the slipperiness is moderated by adding the appropriate inorganic or organic fine particles of the present invention and projecting the inorganic or organic fine particles on the outermost surface. Further, the smaller the amount of the lubricant in the laminated film 1 of the thermoplastic resin, the more the bleed-out amount can be suppressed, and the change in the amount of the lubricant on the surface with time can be reduced. ..

It is desirable that the material of the laminated film 1 of the thermoplastic resin has appropriate flexibility and also has good processability such as 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, block random copolymers. Polypropylene, ethylene vinyl acetate copolymer obtained by copolymerizing the above olefin and vinyl acetate, ethylene-methyl acrylate copolymer (EMA) obtained by modifying the side chain of olefin, ethylene-ethyl acrylate copolymer (EEA) ), Ethylene-butyl acrylate copolymer (EBA), ethylene-methacrylate copolymer (EMAA) and the like. These materials may be used alone, or a plurality of these materials may be used in combination.

Hereinafter, the details of each configuration in the present embodiment will be described.

Physical properties required for the thermoplastic resin laminated film 1 include impact resistance, heat sealability, rigidity, and tearability. Impact resistance and heat sealability can generally be improved by using a low-density resin. The low-density resin has a branched structure consisting of a main chain and a side chain in the molecule, so that crystallization does not proceed and the softening temperature and melting point are low, so it has excellent heat sealability, low crystallinity, and softness, so it has impact resistance. Excellent for. On the other hand, the rigidity and tearability can be improved by using a high-density resin. A crystalline polymer such as polyethylene is composed of a crystalline region and an amorphous region, and the higher the density, the larger the proportion of the crystalline region. Therefore, the higher the density, the higher the hardness of the film and the higher the rigidity.
Further, in a polyethylene resin, it is generally considered that the degree of molecular branching is low when the density is high, so that the tearability can be improved by increasing the density.
Therefore, as shown in FIG. 1, the laminated film of the present invention has a two-layer structure, the first layer 4 is a low-density resin, and the second layer 5 is a medium to high-density resin. The heat-sealing property is good, and the rigidity and tearability can also be improved.
Further, the inorganic or organic fine particles added to the laminated film 1 of the thermoplastic resin project to the surface 2 of the outermost layer, so that the slipperiness and blocking resistance during processing can be improved.

Considering rigidity, impact resistance, heat sealability, and tearability, the thermoplastic resin laminated film 1 is mainly made of polyethylene in each layer. The average density of polyethylene in the first layer 4 is 0.910 g / cm3 to 0.930 g / cm3, and the average density of the second layer 5 is in the range of 0.920 g / cm3 to 0.940 g / cm3. , It is more preferable that the density is higher than the average density of the first layer 4. The density is measured by a measuring method based on JISK7112: 1999 or a measuring method comparable thereto. Here, "mainly" means that the polymerization ratio of the resin used for the laminated film 1 of the thermoplastic resin is 70% or more.

It is preferable that both the first layer 4 and the second layer 5 are a mixture of linear low density polyethylene (LLDPE) and low density polyethylene (LDPE). By mixing LDPE with LLDPE, it is possible to achieve both the above-mentioned various physical properties and processability such as neck-in. More preferably, the weight ratio of LLDPE: LDPE is mixed at a ratio of 99: 1 to 70:30.

As shown in FIG. 4, the laminated film 1 of the thermoplastic resin may have a multilayer structure in which the thermoplastic resin film has three or more layers. As an example of the multi-layer structure, in order to further increase the rigidity of the packaging material film, a resin layer having a higher density than the resin used for the first layer 4 and the second layer 5 may be used for the third layer 8. Further, in order to suppress curling due to heat shrinkage of the laminated film 1 of the thermoplastic resin, a resin layer having the same density as that of the first layer 4 may be used for the third layer 8.

The laminated film 1 of the thermoplastic resin blended in this way can effectively obtain slipperiness by the inorganic or organic fine particles protruding from the front surface 2 of the outermost layer and the back surface 3 of the backmost layer.
Further, when pressure is applied to the film, if the protrusions of the inorganic or organic fine particles are spherical, the stress received by the protrusions is dispersed over the entire surface of the protrusions, so that the film surfaces are crushed by the crushing of the protrusions. It is possible to prevent an increase in the contact area and expect an effect on blocking resistance.

Examples of the inorganic or organic fine particles include acrylic particles, styrene particles, styrene acrylic particles and their crosslinked products, polyurethane particles, polyester particles, silicon particles, fluorine particles, copolymers thereof, zeolite, and pyrophyllium. Clay compound particles such as light, talc, smectite, vermiculite, mica, green mud, kaolin minerals, 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. There are various shapes of these fine particles, but those having a spherical shape and a uniform sphere diameter are desirable.
Further, the fine particles used for the first layer 4 are more preferably organic fine particles, and the fine particles used for the second layer 5 are more preferably inorganic fine particles. This is because the inorganic fine particles can suppress the mass loss due to thermal decomposition when molding the thermoplastic resin laminated film containing the inorganic fine particles.
Further, it is more preferable that the organic fine particles or the inorganic fine particles are harder than the thermoplastic resin. If particles harder than the thermoplastic resin are used, it is possible to prevent the protrusions on the surface from being crushed when pressure is applied to the thermoplastic resin. As a result, it is possible to prevent the contact area between the thermoplastic resin laminated films from being increased due to the crushing of the protruding portion, and it is possible to effectively improve the slipperiness and blocking resistance.

Examples of the lubricant for improving the slipperiness include sucrose fatty acid ester and glycerin fatty acid ester, and as the synthetic resin type, hydrocarbon type such as liquid paraffin, paraffin wax and synthetic polyethylene wax, stearic acid, bechenic acid, stearyl alcohol and the like. Fatty acid type, stearic acid amide, ethylene bisstearic acid amide, fatty acid amide such as ethylene bisoleic acid amide, and the like. Among them, fatty acid amides having a molecular weight of 250 to 350 such as stearic acid amide, oleic acid amide, erucic acid amide, and behenic acid amide are preferable. This is because these organic lubricants bleed out to the film surface quickly and can exert their effects immediately after molding. In particular, if the slipperiness of the packaging film is poor, film elongation and wrinkles are likely to occur during processing, so an organic lubricant that can be expected to have an effect of improving the slipperiness at an early stage is suitable.

The laminated film 1 may contain various other additives. For example, it is possible to appropriately add an antioxidant or the like for imparting processing stability.

In the packaging material 11 using the laminated film 1, the lubricant bleeds out with time after the film is formed, and the slipperiness changes. Therefore, the good slipperiness of the surface 2 of the outermost layer of the laminated film 1 of the thermoplastic resin in the present invention is defined as the packaging material after the film formation of the laminated film 1 of the thermoplastic resin, the dry lamination, and the aging process. Until then, it means that the static friction coefficient of the surface 2 on the first layer 4 side of the laminated film 1 of the thermoplastic resin is always in the range of 0.1 to 1.2. The packaging material 11 having good slipperiness can prevent wrinkles and poor winding of the packaging material when it is wound and stored in a paper tube, and also prevents the seal position from being displaced in the bag making process. be able to. Therefore, the range of the coefficient of static friction is more preferably 0.15 to 0.9. The smaller the amount of the lubricant compounded, the more the bleed-out amount is suppressed, and the coefficient of static friction is 0.1 to 1.2 even after the film 1 of the thermoplastic resin laminated film 1 is formed and after the packaging is molded. Can be kept within the range of.

In the slipperiness evaluation in the present invention, a slip angle measuring device manufactured by Toyo Seiki Seisakusho was used to measure the coefficient of static friction between the surfaces on the first layer 4 surface 2 side after the film formation, the dry lamination, and the aging process. Width 30 mm x length 40 mm, height 30 mm, and a weight of 197 g that is in close contact with the non-measurement surface of the test piece, placed on the fixed side test piece, and begins to slide on the slope as the inclination angle increases. The coefficient of static friction is calculated from the angle.

The surface roughness of the surface 2 of the first layer 4 of the laminated film 1 of the thermoplastic resin is determined by the size and amount of the inorganic or organic fine particles to be blended. The larger the surface roughness, the smaller the contact area between the front surface 2 of the first layer 4 of the thermoplastic resin laminated film 1 and the back surface 3 of the second layer 5 with other films, and the slipperiness and resistance of the laminated film 1 The blocking property can be improved. In order to exhibit good blocking resistance and slipperiness, it is more preferable that the surface roughness on the surface 2 side of the first layer 4 is 0.5 to 2.0.

For the measurement of the surface roughness, a laser microscope (model number: VK-X200) manufactured by KEYENCE was used, the magnification of the objective lens was increased to 10 times, and the arithmetic average roughness Ra of the surface 2 was calculated.

When obtaining good surface roughness of the front surface 2 of the first layer 4 and the back surface 3 of the second layer 5 of the laminated film 1, it is more preferable that the inorganic or organic fine particles used for the first layer and the second layer are spherical. When the front surface 2 of the first layer 4 of the laminated film 1 and the back surface 3 of the second layer 5 come into contact with each other, the pressure due to the adhesion between the first layer 4 and the second layer 5 is uniformly applied, and the laminated film 1 has uniform slipperiness. , Blocking resistance can be obtained.

The method for producing the laminated film 1 of the present invention is not particularly limited, and a known production method can be used. For example, by the coextrusion method, laminated first layer 4 and second layer 5 having different amounts of inorganic or organic fine particles added can be obtained. Further, when the T-die is used for manufacturing, the transparency of the film-forming film can be obtained.

When the laminated film 1 of the present invention is used as a packaging material 11 such as a packaging bag, a base material layer 10 and a functional layer 9 such as a printing layer and a barrier layer are formed on the back surface 3 on the second layer side of the laminated film 1. As a result, the packaging material 11 having the effect of the present invention can be obtained. For example, the layer structure of the packaging material 11 includes a three-layer structure of a base material layer 10, a functional layer 9, and a laminated film 1, a two-layer structure of a base material layer and a laminated film, and a multi-layer structure of four or more layers. It may be configured.

The base material layer 10 is a layer that functions as a support for the packaging material 11, and a film mainly made of plastic is used, and is appropriately selected depending on usage conditions such as the type of contents and the presence or absence of heat treatment after filling. As the material of the base material layer 10, for example, polyethylene, polypropylene, polyethylene terephthalate, nylon and the like are used, but the material is not particularly limited. Further, it may be a single layer composed of one of the above materials, or may be a layer in which a plurality of the above materials are combined by laminating such a single layer.

Examples of the functional layer 9 include the addition of a print layer and a barrier layer. The barrier layer is a layer having a function of enhancing the barrier property for protecting the packaging material from gases such as oxygen contained in the air, water vapor, and enclosed contents, and the material is, for example, EVOH, aluminum, or the like. The metal of the above can be mentioned and can be used as appropriate.

By using the packaging material 11 of the present invention and welding the peripheral edges of the surfaces 2 of the laminated films 1 facing each other by heat sealing or the like, a packaging body having the above-mentioned effect of the present invention can be obtained.
Examples of the packaging body of the present invention include a standing pouch, a packaging bag, a pouch with a spout, a lami tube, a back-in box, and the like, but they can be used for various other purposes.

As an example of the package, the structure and the manufacturing method when the packaging material 11 of the present invention is adopted for the standing pouch will be described with reference to FIGS. 9 and 10. A standing pouch is a type of container that can store liquid, powder, and solid toiletries such as liquid detergents, softeners, shampoos, and conditioners, and foods such as cooking oil, instant coffee, and liquor. In addition to the same bag-making method as the above-mentioned package, a sealant film is used as a bottom tape, and the sealant film is inserted between the front surface of the main body and the back surface of the main body to seal the peripheral edge, so that the bag can easily stand on its own. FIG. 9 is a cross-sectional view of the standing pouch 12, and FIG. 10 is a schematic view showing a state during web transportation before the standing pouch 12 is formed.

Hereinafter, the standing pouch 12 obtained by the present invention will be described in detail. As shown in FIG. 9, the standing pouch 12 has a pouch front surface 13 and a pouch back surface 14 by bending the packaging material 11 of the present invention inside. At that time, the peripheral seal portion including the left and right side seal portions 22 and the bottom seal portion 23 shown by shading in FIG. 9 is heat-sealed to form a package.

Further, the bottom tape 20 is separately formed and inserted between the pouch front surface 13 and the pouch back surface 14 to seal the peripheral edge, thereby providing independence.

Further, on the upper portion of the standing pouch 12 (opposite to the bottom tape 20), a pouring nozzle 16 for pouring out the contents is formed by the pouch front surface 13, the pouch back surface 14, and the pouring nozzle sealing portion 24. .. The dispensing nozzle seal portion 24 is a sealing portion continuously provided on the side sealing portion 22, and is provided below the dispensing nozzle 16.

The dispensing nozzle 16 is formed with a dispensing nozzle tip sealing portion 25 whose tip is heat-sealed, and functions as an opening knob 18 separated and formed by an opening cut line 17 provided in the dispensing nozzle seal portion 24. To do. That is, the user can form a spout (not shown) by holding the opening knob 18 and cutting it along the pre-formed half-cut line 19. Not limited to this method, a cap with a spout made of resin or the like may be separately provided to open and close the spout to provide a spout function.

The half-cut line 19 is provided on each of the pouch front surface 13 and the pouch back surface 14. As a method for forming the half-cut line, a method of forming by a cutting tool or a method of forming by laser processing is generally used, but the method of forming by laser processing is preferable because a uniform and stable cut can be formed. A carbon dioxide laser is more preferable as the type of laser.

As an example of a method for manufacturing the standing pouch 12, as shown in FIG. 10, a packaging material 11 having a width of about twice the height when the standing pouch 12 is made to stand on its own is fed out in a web shape and half-cut. Line 19 is formed. After that, the laminated body is bent along the ridge line 21 of the bent portion to form the pouch front surface 13 and the pouch back surface 14, and the bottom tape 20 is inserted to heat-seal the peripheral portion, and the standing pouch 12 is punched into a predetermined shape. Can be configured.

In addition, the pouring nozzle 16 may be provided with other features such as forming a continuous embossed portion 26 from the pouch surface 13 to the pouch back surface 14 via the bent portion ridge line 21. .. That is, by using the packaging material 11 of the present invention, a standing pouch 12 having the above-mentioned effects can be obtained.

Hereinafter, examples of the present invention will be described in detail, but the present invention is not limited to the following examples.

The laminated film in the present invention was coextruded at 260 ° C. with a three-layer single-screw extruder to form a two-layer film having a thickness of 100 μm with a first layer of 15 μm and a second layer of 85 μm. The second layer is a blend of a linear low-density polyethylene resin (density 0.918 g / cm3) and a low-density polyethylene resin (density 0.924 g / cm3) in a blending ratio of 8: 2. Is a blend of a linear low-density polyethylene resin (density 0.931 g / cm3) and a low-density polyethylene resin (density 924 g / cm3) at a blending ratio of 8: 2, and is blended in the first layer. The average particle size of the spherical organic fine particles (acrylic crosslinked body) is 3 to 20 μm, the addition amount is in the range of 3000 to 70,000 ppm, and the average particle size of the spherical inorganic fine particles (zeethylene) blended in the second layer is 1 to 10 μm. The addition amount of fatty acid amide (erucic acid amide), which is a lubricant to be blended in the first layer and the second layer, is in the range of 0 to 20000 ppm, and the addition amount is in the range of 0 to 300 ppm, as shown in Tables 1 to 5. The film was formed under the same conditions.

The laminated film 1 obtained in the above Examples and Comparative Examples is packaged by laminating a base material layer 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 are laminated by dry laminating and packaging. I got the material. A polyester-based adhesive was used, and after dry laminating, the adhesive was stored at 50 ° C. for 2 days.

With respect to the thermoplastic resin laminated film and the packaging material obtained in each example, the surface roughness evaluation experiment due to the protrusion of the organic fine particles on the outermost surface on the first layer side of the laminated film and the evaluation of the performance required for various packaging bodies were carried out. Properties evaluation, blocking resistance evaluation, heat sealability evaluation, and laminate strength evaluation experiments were carried out.

(Slipperiness evaluation)
The slipperiness of the packaging film is evaluated by the tilting method, which uses a slip tilt angle measuring device manufactured by Toyo Seiki Seisakusho to calculate the static friction coefficient from the angle at which the weight begins to slip when the tilt angle is gradually increased. The coefficient of static friction between the two surfaces having a convex shape was evaluated. As the weight, a metal block having a width of 30 mm × 40 mm in length × 30 mm in height and a weight of 197 g was used.
In the evaluation of the slipperiness of the laminated film, since the organic lubricant bleeds out with time after film formation, the same sample is measured with time immediately after film formation, and the maximum and minimum values are shown in the table. There is. The maximum value is shown immediately after film formation, and then the coefficient of friction decreases on the order of several days. Further, in the evaluation of the slipperiness of the packaging material 11, since the organic lubricant bleeds out similarly with the lapse of time after being taken out from the aging after the dry lamination, the sample is measured with time, and the sample is shown in the table. The maximum and minimum values are shown. The maximum value is shown immediately after aging is taken out, and then the coefficient of friction gradually decreases on the order of several days to several tens of days.
As for the evaluation result, those whose static friction coefficient is always in the range of 0.15 to 0.90 is 〇, and those whose static friction coefficient is always in the range of 0.15 to 0.90 is △, Others were marked with x. In addition, since it has not been possible to measure the coefficient of static friction exceeding 1.2, it is described as "1.2>".

(Surface roughness evaluation)
Using a laser microscope (model number VK-X200) manufactured by KEYENCE, the magnification of the objective lens was increased to 10 times, the surface 2 was measured, and the arithmetic mean roughness Ra was calculated. The arithmetic mean roughness Ra of the surface 2 was calculated according to JISB0601'2001 within the measurement range of 1 mm2.

(Blocking resistance evaluation)
In the evaluation of the blocking resistance of the laminated film, 10 laminated films were stacked and held for 2 days under a load of 0.3 MPa in a compression test apparatus manufactured by Tester Sangyo, and then the blocking strength was measured. To measure the blocking strength, cut out the blocked film into a length of 30 mm width x 100 mm so that only the range of 30 mm x 30 mm is blocked, set the distance between chucks to 50 mm, and set the tensile speed to 300 mm / min, and perform a tensile test manufactured by Shimadzu Corporation. The shear peel strength was measured using a machine (model number AGS-500NX) and used as the blocking strength. The resistance to packaging materials is 0 for those with a blocking strength of 20 [N / 30 mm] or less, Δ for those with a blocking strength of 20 [N / 15 mm] to 30 [N / 15 mm], and × for those with a blocking strength of 30 [N / 15 mm] or more. In the blocking property evaluation, 10 packaging materials 11 were stacked and held in a compression test apparatus manufactured by Tester Sangyo under a load of 0.3 MPa in an environment of 50 ° C. for 2 days, and then the blocking strength was measured. The method for measuring the blocking strength is the same as above. Those in which no blocking was observed were described as 0 in the table and were judged as 0. Although blocking was observed, those with a blocking intensity of 45 [N / 15 mm] or less were marked with Δ, and those with a blocking intensity of over 45 [N / 15 mm] were marked with x.

(Evaluation of heat sealability)
The heat sealability was evaluated using a heat sealer (model number TP-701-B) manufactured by Tester Sangyo, with a seal pressure of 0.2 MPa, a seal time of 1 second, a seal width of 10 mm, a seal temperature of 130 ° C, and a thermoplastic resin. The surfaces on the two surfaces of the laminated film were overlapped and sealed. The sealed film was cut into a width of 15 mm × 100 mm, and the T-shaped peel strength was measured using a tensile tester manufactured by Shimadzu Corporation (model number AGS-500NX) with a distance between chucks of 50 mm and a tensile speed of 300 mm / min. The seal strength was used. The seal strength of 17 [N / 15 mm] or more was evaluated as ◯, the seal strength of 15 [N / 15 mm] to 17 [N / 15 mm] was evaluated as Δ, and the seal strength of 15 [N / 15 mm] or less was evaluated as x.

(Laminate strength evaluation)
Lami strength is obtained by cutting out the packaging material to a width of 15 mm x 100 mm, setting the distance between chucks to 50 mm, and setting the tensile speed to 300 mm / min, using a tensile tester manufactured by Shimadzu Corporation (model number AGS-500NX), and using a T-shaped peeling method. The peeled state of the laminated film of the packaging material and the base material layer was evaluated. The case where the laminated film and the base material layer did not peel off and either the laminated film or the base material layer was broken first was evaluated as ◯, and the case where the laminated film and the base material layer were separated was evaluated as x.

(Comprehensive evaluation)
As a comprehensive judgment, in the laminated film of the present invention, those satisfying all of the following were marked with ◯. That is, as a comprehensive judgment, the evaluation results of slipperiness, blocking resistance, and heat sealability are ○, and the evaluation results of slipperiness, blocking resistance, and laminate strength of the packaging material are ○. Those that were always △ were designated as △, and those that were even one were designated as ×.

(Evaluation results)
Tables 1 to 5 show the evaluation results of the laminated film 1 and the packaging material 11 of each Example and each Comparative Example.

Table 1 is a comparison of Examples and Comparative Examples in which the particle size of the organic fine particles contained in the first layer was changed. From Table 1, the average particle size of the organic fine particles in the first layer is 7 to 15 μm, and the slipperiness at that time is about 0.3 to 0 for both the laminated film and the packaging material. 8.8, Blocking strength is 2.5 to 26.5 for laminated film, packaging material is about 0 to 15.0 N / 30 mm, heat seal strength is about 16.0 to 18.0 N / 15 mm, all judgments of laminated strength It was ○. When the average particle size of the organic fine particles of the first layer is 3 μm or less, the slipperiness and blocking resistance are not effective, and when the average particle size is 20 μm or more, the slipperiness and blocking resistance are good, but heat sealing is performed. Inferior in sex.

Table 2 is a comparison of Examples and Comparative Examples in which the amount of organic fine particles added to the first layer was changed. From Table 2, the total amount of organic fine particles added in the first layer is 6000 to 50,000 ppm, and the slipperiness at that time is approximately 0.25 to 0.95 for both the laminated film and the packaging material. The blocking strength is 2.0 to 30.0 N / 30 mm for the laminated film, about 0 to 40.0 N / 30 mm for the packaging material, and the heat seal strength is about 16.0 to 18.0 N / 15 mm. All the judgments were ○. When the amount of the organic fine particles added to the first layer is 3000 ppm or less, the slipperiness and blocking resistance are not effective, and when the amount added is 70,000 ppm or more, the slipperiness and blocking resistance are good, but the heat sealability is good. Inferior.

Table 3 is a comparison of Examples and Comparative Examples in which the particle size of the inorganic fine particles contained in the second layer was changed. From Table 3, the average particle size of the inorganic fine particles in the second layer is 2 to 8 μm, and the slipperiness at that time is about 0 for both the thermoplastic resin laminated film and the packaging material. The blocking strength was 3 to 0.7, the blocking strength was 7.0 to 29.0 N / 30 mm for the laminated film, 0 N / 30 mm for the packaging material, the heat seal strength was about 18.0 N / 15 mm, and the judgment of the laminate strength was all ○. .. When the average particle size of the inorganic fine particles in the second layer is 1 μm or less, the blocking resistance is not effective, and when the average particle size is 10 μm or more, the lamination strength is inferior.

Table 4 is a comparison between Examples and Comparative Examples in which the amount of organic fine particles added to the second layer was changed. From Table 4, the total judgment of Δ or more is that the amount of the organic fine particles added in the second layer is 1000 to 10000 ppm, and the slipperiness at that time is about 0.3 to 0.8 for both the laminated film and the packaging material. The blocking strength was 7.0 to 25.0 N / 30 mm for the laminated film, 0 N / 30 mm for the packaging material, the heat seal strength was about 18.0 N / 15 mm, and the judgment of the laminated strength was all ◯. When the amount of the organic fine particles added to the second layer is 0 ppm, the laminated film is not effective in blocking resistance, and when the amount added is 20000 ppm or more, the lamination strength is inferior.

Table 5 is a comparison of Examples and Comparative Examples in which the addition amount of the lubricant contained in both the first layer and the second layer was changed. From Table 5, in the comprehensive judgment, the amount of the lubricant added to the first layer and the second layer is in the range of 30 to 200 ppm, and the slipperiness at that time is about the same for both the laminated film and the packaging material. 1.05 to 0.15, blocking strength is about 10.0 to 16.0 for laminated film, 0N / 30mm for packaging material, heat seal strength is about 17.5 to 18.0N / 15mm, lamination strength All the judgments were ○. When the amount of the lubricant added to the first layer and the second layer was 0 ppm, it did not slip, and when it was 300 ppm or more, it slipped too much and good slipperiness could not be obtained.

The present invention is not limited to the above-mentioned examples, and includes various modifications. It is also possible to replace a part of the configuration of one embodiment with another configuration of an embodiment. Furthermore, the above-described examples are described for the purpose of explaining the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described.

1 ... Laminated film 2 ... Front surface 3 ... Back surface 4 ... First layer 5 ... Second layer 6 ... Organic fine particles 7 ... Inorganic fine particles 8 ... Third layer 9 ... Functional layer 10 ... Base material layer 11 ... Packaging material 12 ... Standing pouch 13 ... Pouch front surface 14 ... Pouch back surface 16 ... Dispensing nozzle 17 ... Opening cut line 18 ... Opening knob 19 ... Half cut line 20 ... Bottom tape 21 ... Bent part ridge line 22 ... Side seal part 23 ... Bottom seal part 24 ... Note Outlet nozzle seal part 25 ... Discharge nozzle tip seal part 26 ... Embossed part

Claims (4)

In the laminated film consisting of at least two layers,
The first layer, which is the outermost layer, contains 6000 to 50000 pp of fine particles having an average particle size of 7 to 15 μm.
m is contained, a second layer adjacent the first layer, the average particle diameter are contained 1000~10000ppm fine particles of 2 to 8 m,
In both the first layer and the second layer, 70% or more of the weight ratio is polyethylene.
The average density of the first layer is 0.910 to 0.930 g / cm ³ .
The average density of the second layer is 0.920 g to 0.940 g / cm ³ , and the first layer.
Higher than the average density of the layers,
The coefficient of static friction between the outermost layers composed of the first layer is 0.1 to 1.2.
The fine particles contained in the first layer are spherical organic fine particles, and the fine particles contained in the second layer are spherical inorganic fine particles.
Both the first layer and the second layer contain 30 to 200 ppm of lubricant, and these lubricants are fatty acid amides having a molecular weight of 250 to 350.
A laminated film characterized by this . The laminated film according to claim 1 , wherein the surface roughness Ra of the outermost surface layer composed of the first layer is 0.5 to 2.0 μm. A packaging material, wherein at least a base material layer is laminated on the surface of the second layer of the laminated film according to claim 1 or 2 opposite to the first layer. A packaging body using the packaging material according to claim 3 .

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