JP3370491B2 - Laminated film - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated film, and more particularly to a laminated film for packaging which is in a specific laminated state and is particularly excellent in tear strength.

[0002]

2. Description of the Related Art Conventionally, various films such as polyvinyl chloride film, polyester film, polyacrylic film and polyolefin film have been used for packaging various articles. These films are required to have various physical properties required for the purpose of use, such as having transparency so that the product can be seen, and the finish of the packaging is beautiful and glossy in order to further enhance the commercial value. Has been done.

In particular, in the field of food packaging films, various foods are put in a tray for packaging, so that it has been required to fit into any shape without breaking and to be packaged without wrinkles. In the field of industrial stretch film, for example, a cardboard package is loaded on a pallet, and a stretch film is used to prevent the collapse of the cardboard, and the stretch film is stretched to a high ratio during packaging. It is required that a strong unity be maintained without being broken even during transportation.

[0004]

On the other hand, these films are becoming thinner due to various problems such as reduction of dust, and the film strength as a whole is weakening. Although it becomes softer and stretches along a projection or the like to some extent, since the absolute value of the tear strength becomes low, the tear tends to propagate once the hole is opened.

[0005] Particularly in applications such as food stretch films that use thin films and wrap claw nails, those having protrusions such as thorns, even if such partial cracks occur, the characteristics that the cracks are difficult to propagate, That is, a film having high tear strength is desired. As a result of intensive studies to solve the above problems, the inventors have found that a laminated film in a specific laminated state has a specifically high tear strength, and arrived at the present invention.

[0006]

The present invention comprises at least two aspects.
In a laminated film in which one or more films are laminated,
It is composed of at least one pair of two peelable films which are adjacent to each other, and the adhesion value (g / cm) of the two films is 2 or more.
It is intended to provide a laminated film characterized by being 1% or more of the minimum tear load value (g) of a sheet of film.

A laminated film in which the tear load value ratio of each of the two films is 10 times or less is preferable, and an elongation ratio of each of the two films is preferably 5 times or less. Is a film,

Preferably, the laminated film provides a laminated film obtained by laminating the two films in substantially the same stretch axis direction. Further, in the laminated film in which at least two or more films of the present invention are laminated, it is composed of at least one pair of two peelable films adjacent to each other, and the adhesion value (g / cm) of the two films is Provided is a packaging method characterized by packaging using a laminated film having a minimum tear load value (g) of two films of 1% or more.

According to the present invention, however, a film having a high tear strength and a small thickness, which is unlikely to cause cracks even when packaging an object to be packaged with a large number of protrusions and which is unlikely to propagate cracks, is formed. Obtainable.

The constituent factors of the present invention will be described in detail below. The laminated film of the present invention is a laminated film in which at least two or more films are laminated, and is composed of at least one pair of adjacent two peelable films. The term “releasable” means that the two films are peeled from the interface where the two films are in contact with each other without being broken during the peeling. In a laminated film that is not peelable, its tear strength is no different from that of its constituent films.

Further, the adhesion value (g / cm) expressed in grams per centimeter width of the laminated interface of the two laminated films is 1 of the minimum tear load value (g) of the two films. % Or more, preferably 3% or more. Here, the minimum tear load value (g) of the two films is the smallest of the tear load values (g) in the longitudinal and transverse directions of the two films respectively. The longitudinal direction of the film means a direction parallel to the flow of the film forming process, and the transverse direction means an orthogonal direction thereof. If the adhesive force between the films is less than the above range, sufficient tear strength of the laminated film cannot be obtained, and the film is unnecessarily peeled off, and the effect of the present invention cannot be obtained at all. The adhesion value (g / cm) and the tear load value (g) referred to in the text are values obtained by the method described in Examples of the present specification.

The method for laminating the two films is not particularly limited as long as it is in the above-mentioned adhered state, and any laminating method may be used, for example, a method for laminating the films by self-adhesion by pressure bonding, and further heating. Then, a method of press-bonding and a method of laminating via an adhesive can be used. When the film is formed by inflation extrusion, the balloon-extruded films may be superposed and wound by applying a specific pressure to obtain the adhesive force.

When the two films each have a stretching axis direction, it is desirable to laminate them in substantially the same stretching axis direction. The term "stretching axis direction" as used herein means the direction in which the tear strength is smaller, of the longitudinal or transverse directions of the film.
In the case of a biaxially stretched film, the direction in which the tear strength is small is similarly defined as the stretching axis direction. The term "substantially the same stretch axis direction" means that the crossing angle of the respective films in the stretch axis direction is within 45 degrees, preferably within 30 degrees, and more preferably within 10 degrees. By adjusting the stretching axes, the tear strength of the laminated film tends to be improved.

The thickness of the laminated film is preferably 5-10.
The thickness is 0 μm, more preferably 5 to 50 μm, and particularly preferably 5 to 30 μm. Originally, the one with a small thickness is in a state of being very weak against tearing, so the improvement of tearing strength is remarkable,
It is easy to effectively exert the effect aimed at by the present invention.

The tear load value ratio of the two films is preferably 10 times or less, more preferably 5 times or less. Here, the tear load value ratio is 2 in the same direction in the laminated state.
It is the quotient of the tear load value of a film having a large tear load value divided by the tear load value of a film having a small tear load value.

The elongation ratio of the two films is preferably 5 times or less, more preferably 3 times or less. Here, the elongation ratio means a quotient obtained by dividing the tensile elongation of a film having a large tensile elongation of two films by the tensile elongation of a film having a small tensile elongation in the same direction in the laminated state.

In the film constituting the laminated film of the present invention, the resin is not directly melt-molded as it is,
Prior to that, it is preferably used by mixing with several kinds of compounding ingredients. Considering the ease of molding, suppression of thermal decomposition in the molding process, strength of molded products, rigidity, heat discoloration resistance, UV resistance and other characteristics, selection of raw resin, plasticizer, stabilizer, After compounding components such as a lubricant, a filler, and a colorant with sufficient affinity to form a molding compound, the compound is molded into a film.

The main material of the film is not particularly limited as long as it is a resin forming the film, and any resin may be used. For example, polyvinylidene chloride, chlorine-based resin such as polyvinyl chloride, polyolefin resin such as polyethylene and polypropylene resin, polyester resin, nylon and the like can be used, but the resin for thin film that effectively exhibits the effects of the present invention As the chlorine-based resin and the polyolefin-based resin, particularly preferable are used.

A vinyl chloride resin is particularly preferable as the chlorine resin. The vinyl chloride resin used in the present invention includes not only a vinyl chloride homopolymer but also a vinyl chloride-based copolymer and a polymer blend.

Examples of such copolymers include vinyl chloride and vinyl acetate, higher alkyl vinyl ether (for example, dodecyl vinyl ether) acrylonitrile, acrylic acid ester (for example, methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate), methacryl Acid ester (eg, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, etc.) at least one monomer of other copolymerizable monomers such as acrylamide, methacrylamide, ethylene, propylene, etc. And a copolymer thereof. In the copolymer, vinyl chloride units account for 50 mol% of the entire copolymer.
It is preferable that the above amount, especially 70 mol% or more, is occupied.

The above-mentioned polymer blends include other materials such as polyvinyl chloride, polyvinyl acetate, ethylene vinyl acetate copolymer, acrylonitrile-butadiene-styrene copolymer, methylmethacrylate-butadiene-styrene copolymer and the like. Polymer blends with copolymers (wherein the polyvinyl chloride component is at least 50% of the total)
It is suitable to make up more than 70% by weight, in particular more than 70% by weight. ) Can be mentioned. . When a vinyl chloride homopolymer is used, its polymerization degree is preferably 700 or more.

The polyolefin resin has 2 to 2 carbon atoms.
A low crystalline or highly crystalline resin obtained by polymerizing or copolymerizing mainly olefin of 8 is used,
Ultra low density polyethylene (VLDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDP)
E), at least one resin composition selected from high-density polyethylene (HDPE), polypropylene (PP), atactic polypropylene, polybutene-1 (PB-1), ethylene-acrylic acid copolymer, and the like. Can be used, preferably high density polyethylene (HDPE),
Low density polyethylene (LDPE), linear low density polyethylene (LLDPE), ultra low density polyethylene (VLDP)
E), polypropylene (PP), polybutene-1 (PB
At least one resin composition selected from the group -1) can be used, and VLDPE can be used from the viewpoint of film elongation.
Alternatively, a composition mainly containing LLDPE is more preferable. The above polyethylene-based resin also includes a copolymer of ethylene and propylene, butene-1, pentene-1, hexene-1, putene-1, octene-1, 4-methylpentene-1 and the like.

Further, the film may be composed of a plurality of film layers having different compositions. For example, a three-layer film such as EVA / LL / EVA by co-extrusion or a five-layer film such as EVA / adhesive layer / PP / adhesive layer / EVA can be used.

The film constituting the laminated film of the present invention may contain a plasticizer for softening the film. Examples of usable plasticizers include phthalic acid esters such as dimethyl phthalate, diethyl phthalate, dibutyl phthalate and dioctyl phthalate; phthalic acid mixed group esters such as butylbenzyl phthalate, butyllauryl phthalate and methyloleyl phthalate. Kinds; diisodecyl succinate, dioctyl adipate, diisodecyl adipate,
Aliphatic dibasic acid esters such as dioctyl azelate, dibutyl sebacate, dioctyl sebacate; glycol esters such as diethylene glycol dibenzoate; butyl oleate, methyl acetylricinoleate
Fatty acid esters such as chlorinated fatty acid methyl and methoxy fatty acid methyl; tricresyl phosphate, trioctyl phosphate, octyl diphenyl phosphate, triphenyl phosphate,
Phosphoric acid esters such as triphenyl phosphate; epoxidized soybean oil, epoxidized linseed oil, epoxidized butyl stearate, epoxidized benzyl stearate, and epoxy plasticizers such as dioctyl epoxyhexahydrophthalate;
Other plasticizers such as trioctyl trimellitate, ethyl phthalyl glycolate, butyl phthalyl ethyl glycolate, tributyl acetyl citrate, chlorinated paraffin, polypropylene adipate, polypropylene sebacate, triacetin, tributyrin, toluene sulfonamide, biphenyl When used for food packaging, those approved by the US FDA and the like are preferably used. Particularly preferred are diisononyl adipate (DINA) and dioctyl adipate (n-DO).
A) Epoxidized soybean oil (ESO), epoxidized linseed oil (ELO) and the like are used.

The film of the laminated film of the present invention can be used for various stabilizers (heat stabilizers, antioxidants, etc.), antiblocking agents, slip agents, etc. necessary for film formation, and for applications requiring antifogging property. On the other hand, an antifogging agent can be added, and a tackifier or the like can be added for applications requiring tackiness. Known additives can be used as these additives as long as they do not adversely affect the properties such as antifogging property or tackiness.

In addition to antifogging properties, addition of a nonionic surfactant is effective for antifogging purposes in order to enhance the commercial value of the package such as slipperiness, antistatic properties and label adhesion. Examples of the nonionic surfactant include known glycerin, polyglycerin, sorbitan, sorbitol, pentaerythritol, polyethylene glycol, polypropylene glycol, and other polyhydric alcohols, and an alkyl group having 5 to 13 carbon atoms.
Fatty acid ester obtained from the above-mentioned straight-chain saturated fatty acid or a straight-chain unsaturated fatty acid having 17 to 21 carbon atoms in the alkyl group, and an ethylene oxide adduct of such fatty acid ester (n =
5-20) are used.

Preferably, diglycerin monooleate (DG
MO), diglycerin monolaurate (DGML), glycerin monooleate (GMO), sorbitan monooleate (SMO), sorbitan monolaurate (SM)
L) and glycerin diolate (GDO) may be used alone or in combination of two or more kinds. In the case of a laminated film, only both surface layers may be added, and if necessary, it may be added to all resin layers. The addition amount varies depending on the resin, but is generally 0.5 to 5.0% by weight per resin layer. Is greatly influenced by the crystallinity and orientation of the film, and must be selected accordingly. For example, a film using polypropylene has a high degree of crystallinity, and therefore the amount of bleeding becomes small unless the addition amount is made larger than that of the same polyolefin film such as polyethylene film, so that the effect is not exhibited. Further, even when films made of the same material are stretched, bleeding is similarly inhibited, so that the effect is not exhibited with the same addition amount.

The amount of nonionic surfactant added is 0.5% by weight.
If it is less than the following, the slipperiness becomes insufficient, the antifogging effect becomes insufficient, and when it is used in an automatic packaging machine or the like, the roll peeling force becomes large and the slippage becomes heavy, so that the film feeding becomes difficult, Problems such as being unable to do so tend to occur. On the contrary, if the addition amount is 5.0% by weight or more, the bleeding of the nonionic surfactant to the film surface increases, so that the film may come off due to excessive slippage or uneven antifogging effect may occur. Therefore, the value as a packaging film tends to be halved.

Various known tackifiers can be used for industrial stretch film applications such as pallet packaging, but polyisobutene (PIB), atactic polypropylene (APP) and the like are preferably used. These tackifiers have the following properties when the film is inflation-molded:
It is generally added in an amount of up to 5% by weight, and is preferably 3% by weight or less in the case of molding by the T-die method. The difference in the added amount is due to the smoothness of the surface due to the manufacturing method, and in the T-die method capable of quenching, almost the same adhesiveness can be imparted with the added amount of half or less of the air-cooled inflation molding.

The method of producing the film constituting the laminated film of the present invention is not particularly limited as long as it is a method of producing a film, and any method may be used. For example, an inflation method using a single-layer die, a melt extrusion molding method such as a T-die method, a co-extrusion method such as an inflation method using a multi-layer die or a T-die method, a solution casting method, a calendering method and the like can be mentioned.

In the case of molding by the melt extrusion molding method, it is obtained by supplying a raw material to an extruder and cooling the molten resin discharged from a die to a predetermined thickness. As a resin raw material during compounding, pellets,
It may be in any form such as powder, flakes, strips, film-shaped raw materials or recovered materials.

The extrusion temperature is preferably selected as appropriate depending on the type of resin and the like. For example, PVC is 150 ° C. to 200 ° C.,
For polyethylene such as linear low density polyethylene (LL)
150 ℃ ~ 220 ℃, 17 for polypropylene (homopolymer)
The temperature is preferably 0 to 250 ° C., the moldability is good, and the troubles such as burning due to heat deterioration of the resin are reduced.

The laminated film of the present invention can be used as a shrink wrapping film and a stretch wrapping film, which are often used for commercial packaging of sundries, foods and the like, pallet packaging, etc., and particularly useful as a stretch wrapping film. Is.

Since the laminated film of the present invention has a high tear strength, the resistance value against tearing will of course increase with the same film thickness, but when a constant resistance value against tearing is required, it is more preferable. Even if the film thickness is reduced, it is possible to meet the demand. Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to the examples.

[0035]

EXAMPLES The test methods used in the examples are shown below. 1. Interlayer adhesion (180 degree peeling adhesion) Measured using the method described in JIS Z 0237. The measurement sample was prepared by stacking two films, sandwiching the paper between the layers at one end thereof, and press-bonding or heat-pressing the part other than the part sandwiching the paper. At the time of measurement, the part sandwiching the paper was peeled off, and each film was fixed to a chuck of a tensile tester to measure the interlayer adhesion force.

2. Tear strength and tear load value Using the measurement according to the method of JIS P 8116, the tear load value (g) expressed in grams was obtained. Then, the tear strength (kg / cm) was obtained by converting the tear load value into the number of kilograms per unit centimeter thickness (cm) of the film.

3. Tensile strength and elongation According to JIS Z 1707, longitudinal (MD) direction and transverse (T)
A tensile test in the D) direction was performed.

4. Using a dial gauge (thickness meter) capable of measuring the film thickness down to the unit of 0.1 μm, 10 points were measured in the lateral direction of the film, and the average value was taken as the average thickness.

Reference Example 1 Preparation of Film A-1 100 parts by weight of polyvinyl chloride resin (TS-1100R manufactured by Toagosei Co., Ltd.) having an average degree of polymerization of 1100 was added to diisononyl adipate (Plastic manufactured by Shin Nippon Rika Co., Ltd.). Agent; DINA) 28 parts by weight, epoxidized soybean oil (Plasticizer manufactured by Shin Nippon Rika Co., Ltd .; E-
2000H) 7 parts by weight, calcium-zinc composite stabilizer 1 part by weight, diglycerin laurate (anti-fog agent manufactured by Riken Vitamin Co., Ltd .; Riquemal O-71-D) 1.6 parts by weight, glycerin oleate (RIKEN Vitamin Co., Ltd.) Anti-fogging agent; Riquemal OL-10
0) 0.4 part by weight and 0.2 part by weight of glycerin monostearate (lubricant manufactured by Riken Vitamin Co., Ltd .; Riquemal S-100) were mixed in a Henschel mixer to prepare a compound.

This compound was used in a hopper of a 100 mm diameter extruder equipped with a 280 mm diameter spider type inflation die, an air ring and a L / D = 28 continuous compression type screw generally used for processing soft vinyl chloride. Charge, cylinder temperature 180 ℃, rotation speed 75rpm,
Extruded at a discharge rate of 100 kg / hr, adjusted the take-off speed with a blow ratio of 3.5, and a vinyl chloride resin film A- with a thickness of 7.5 μm
Got one. The physical properties of the film are shown in Table 1.

[0041]

[Table 1]

Reference Example 2 Production of Film A-2 A vinyl chloride resin film A-2 having a film thickness of 14 μm was produced in the same manner as in Reference Example 1 except that the take-up speed of the film was adjusted.

Reference Example 3 Preparation of Film A-3 A film A-3 of vinyl chloride resin having a film thickness of 31 μm was prepared by adjusting the take-up speed in the same manner as in Reference Example 2.

Reference Example 4 Preparation of Film B-1 EVA (VA content = 15% by weight, MFR = 2.2, “NUC-3758” manufactured by Nippon Unicar Co., Ltd.) was coated with diglycerin oleate (RIKEN Vitamin Co., Ltd.) Agent; O-71-D) 1.0% by weight
Extruder 2 with 55 mm diameter and L / D = 28 for the added resin composition
Using a table, each cylinder temperature 160 ℃, discharge rate 50kg
Extruded at / hr.

On the other hand, VLDPE (d = 0.906, MFR =
1.0 A resin mixture consisting of 90 wt% of "DFDA1137" manufactured by Nippon Unicar Co., Ltd.) and 10 wt% of the above EVA resin was added to diglycerin oleate (Anti-fog agent manufactured by Riken Vitamin Co., Ltd .; O-71-
Resin composition containing 1.0% by weight of D) has a diameter of 65 mm, L / D
= 1 extruder of 28 was used to extrude at a cylinder temperature of 180 ° C. and a discharge rate of 50 kg / hr. Both of them are supplied to one annular multi-layer die, and 3μ containing VLDPE and EVA as main components is used.
Inflation molding was performed at a die temperature of 180 ° C. and a blow ratio of 4.8 so that a surface layer of 3 μm containing EVA as a main component was laminated on both sides of the intermediate layer of m, and thus an olefin resin of three layers having a total thickness of 9 μm was formed. A film B-1 was obtained.

Example 1 Film A-1 was laid flat on a release paper and the film A
-1 on top of the other film A-1 so that the stretching axis direction is the same, sandwich the paper between the two films at one end, JIS K 6301 (vulcanized rubber physical test other than the paper part Method) Spring hardness 80 ± 5Hs, width approx. 45mm, diameter approx. 83mm, weight 2000 ±, covered with 6mm thick rubber layer
A 50 g roll was reciprocated once at a speed of about 300 mm / min to obtain a laminated film E-1.

The adhesion value (g / cm) of the laminated film E-1 is
0.7, the minimum tear load value is the tear load value (g) 23 in the stretch axis direction of the film A-1, and the adhesion value is the minimum tear load value of 3.
It was 04%. Table 2 shows the physical properties of the laminated film.
The film A-1 of the raw material film, the tear strength in the stretching axis direction of each film A-2 of the unit having almost the same thickness as the laminated film E-1 is about 30 kg / cm, the tear strength in the direction orthogonal to the stretching axis is about 60 kg / cm. On the other hand, the laminated film E-1 showed a large tear strength of 62 kg / cm in the stretching axis direction and 153 kg / cm in the direction orthogonal to the stretching axis.

[0048]

[Table 2]

Example 2 A laminated film E-2 was obtained in the same manner as in Example 1 except that the weight of the roll was 4000 g.

Example 3 A laminated film E-3 was obtained in the same manner as in Example 1 except that the weight of the roll was 10 kg.

Example 4 Film A-2 was laid flat on a release paper and
A laminated film E-4 was obtained in the same manner as in Example 3 except that another film A-2 was superposed on -2 so that the stretching axis directions thereof coincided with each other. The film A-2 of the raw material film, the laminated film E-4 and the film A-3 of a unit having substantially the same thickness as the tear strength in the stretching axis direction is about 30 kg / cm, and the tear strength in the direction orthogonal to the stretching axis is about 60 kg / cm. On the other hand, the laminated film E-4 has a stretching axis direction of 97 kg / cm and a stretching axis orthogonal direction of 20
It showed a good tear strength of 2 kg / cm.

Example 5 A laminated film E-5 was obtained in the same manner as in Example 4 except that the film A-2 was used as the film laminated on the film A-1.

Example 6 Film B-1 was laid flat on a release paper and
A laminated film E-6 was obtained in the same manner as in Example 3 except that another film B-1 was superposed on -1 so that the stretching axis directions were the same. The tear strength in the stretch axis direction of the film B-1 of the raw material film is 20 kg / cm, while the tear strength in the direction orthogonal to the stretch axis is 31 kg / cm, the laminated film E-6 is 30 kg / cm in the stretch axis direction and stretched. It showed good tear strength at 47 kg / cm in the direction orthogonal to the axis.

Comparative Example 1 Film A-1 was laid flat on a release paper, talc was thinly dusted on the surface to prevent adhesion, and another film A-1 was placed on top of it so that the stretching axis directions were the same. The laminated film C-1 having an adhesive force of 0 was obtained only by superposing it on the sheet and superposing it without any pressure bonding. Laminated film C in Table 3
The physical property of -1 was shown. Tear strength 30 kg / cm in the stretching axis direction of each of the film A-1 of the raw material film and the laminated film C-1 and the unit film A-2 having substantially the same thickness, and the tear strength in the direction orthogonal to the stretching axis is approximately 60 kg / cm. The laminated film C-1 showed almost no change in tear strength at 33 kg / cm in the stretching axis direction and 60 kg / cm in the direction orthogonal to the stretching axis.

[0055]

[Table 3]

Comparative Example 2 A laminated film C-2 was obtained in the same manner as in Example 1 except that the weight of the roll was 200 g. The adhesion value (g / cm) of the laminated film C-2 is 0.18, the minimum tear load value is the tear load value (g) 23 of the film A-1 in the stretching axis direction, and the adhesion value is the minimum tear load value. It was 0.78%. The tear strength of the laminated film C-2 showed a value that was not so different from the tear strength of the film A-1 as the raw material film and the film A-2 having the same thickness as that of the laminated film C-1.

Comparative Example 3 Film A-1 was placed flat on a release paper and the film A
-1 is overlaid with another film A-1 so that the stretching axis directions are the same, and the film is placed between the 120 ° C laminating rolls.
It was passed once to obtain a laminated film C-3. Laminated film C-3
Is a laminated film in which the two films A-1 that compose it cannot be peeled off, and its tear strength is a unit film having the same thickness as the raw material film A-1 and laminated film C-1. A-2 shows a value that is not so different from each tear strength.

[0058]

The laminated film of the present invention has at least 2
In a laminated film in which one or more films are laminated,
It is composed of at least one pair of two peelable films which are adjacent to each other, and the adhesion value (g / cm) of the two films is 2 or more.
It is a laminated film characterized by being 1% or more of the minimum tear load value (g) of a sheet of film.

The film of the present invention having the above-mentioned structure has a high tear strength and a small thickness, and is unlikely to cause cracks even when packaging an object to be packaged with many protrusions, and It is possible to obtain a laminated film in which cracks hardly propagate.

Claims (13)

(57) [Claims] 1. A laminated film in which at least two films are laminated, which is composed of at least one pair of two peelable films adjacent to each other, and the adhesion value (g / cm) of the two films. Is 1% or more of the minimum tear load value (g) of the two films, a laminated film. 2. The tear load value ratio of each of the two films is
The laminated film according to claim 1, which is 10 times or less. 3. The laminated film according to claim 1, wherein the elongation ratio of each of the two films is 5 times or less. 4. The laminated film according to claim 1, wherein the two films each have an elongation of 50% or more. 5. The laminated film according to claim 1, wherein the laminated film is formed by laminating the two films in substantially the same stretch axis direction. 6. The laminated film according to claim 1, wherein the two films are films selected from chlorine-based resin films or polyolefin-based films. 7. The laminated film according to claim 1, wherein the two films are made of the same type of film. 8. The laminated film according to claim 1, wherein the laminated film has a thickness of 100 μm or less. 9. The laminated film according to claim 1, which is a wrapping film for packaging. 10. A laminated film in which at least two or more films are laminated, comprising at least one set of two peelable films adjacent to each other, and the adhesion value (g / g) of the two films. cm) is 1% or more of the minimum tear load value (g) of the two films,
A packaging method characterized by packaging. 11. The packaging method according to claim 10, wherein the tear load value ratio of each of the two films is 10 times or less. 12. The packaging method according to claim 10, wherein the laminated film is formed by laminating the two films in substantially the same stretching axis direction. 13. The packaging method according to claim 10, wherein the two films are films selected from a chlorine-based resin film or a polyolefin-based film.