JP2006095893A - Laminated film, and its application - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated film for packaging which is harmless when being disposed while having a high gas barrier property, and to provide a package made of the laminated film. <P>SOLUTION: This laminated film comprises a base material layer, a sealant layer made of a polyolefin, and a barrier layer. The laminated film has the barrier layer, for which an organic high molecular compound and/or an inorganic compound is coated, or an inorganic substance is deposited, between the base material layer and the sealant layer. The oxygen permeability is less than 100 ml/(m<SP>2</SP>24 hrs MPa), the thrusting strength is 7 N or higher, and the coefficient of dynamic friction is less than 0.5. The laminated film does not contain a chlorine compound, and the bleeding of an additive of the sealant layer is as little as being invisible over 24 months at a normal temperature. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a laminated film formed by laminating a synthetic resin and its use. More specifically, the present invention can be used as a packaging body such as a seal bag, and in particular, a bag body suitable for packaging clothing items and leather products. And a package made of the laminated film.

  For clothing or leather products, etc., after using them, they are cleaned and dried by dry cleaning, etc., and cleaned by wiping off dirt, etc., and stored in the storage location. If it is not done, worms and mold may occur, making it unusable and / or remarkably deteriorating in appearance.

  Therefore, as a part of the service of the cleaning company, the clothes and leather products that have been cleaned have been wrapped with a laminated film for packaging, and the contents are sealed by sealing with a moisture absorbent or deoxidizing material. To be done.

  Since the laminated film for packaging needs to protect the clothing and leather products over a long period of time, for example, several months to several years, specifically 6 months to 24 months, In addition to moldability and strength, gas barrier properties, non-bleeding properties and pinhole resistance are required. In addition, in order to quickly wrap clothing, leather products, etc., the laminated film for packaging is required to have slipperiness on the inner surface. Further, when the laminated film for packaging or a package made of the film is disposed of by incineration after use, it is necessary to consider environmental measures.

  Examples of the film in which the gas barrier property is considered as described above include a film formed by extruding a resin mainly composed of vinylidene chloride resin and having an oxygen permeability within a predetermined range (for example, Patent Document 1). etc).

Examples of prior art documents of the present invention include the following.
JP-A-6-31252

  In the laminated film for packaging, since it is necessary to satisfy various conditions such as gas barrier property, non-bleeding property, pinhole resistance, slipping property, etc., it is expensive or like the film described in Patent Document 1. Films that can release toxic substances upon disposal have been used.

  Accordingly, the present invention provides a laminated film for packaging that has high gas barrier properties (non-oxygen permeability) and other properties necessary for use as packaging materials, but is harmless in disposal such as incineration. It aims at providing the package which consists of a film.

In order to achieve the above object, the laminated film 1 of the present invention is
A base material layer 11, a barrier layer 15, and a sealant layer 12 made of polyolefin, and an organic polymer compound and / or an inorganic compound on the surface of the base material layer 11 or between the base material layer 11 and the sealant layer 12. Has a barrier layer 15 that is coated with or deposited with an inorganic substance, has an oxygen permeability of less than 100 ml / m ² · 24 hrs · MPa, a puncture strength of 7 N or more, and a dynamic friction coefficient of less than 0.5, It is characterized by not containing a chlorinated compound such as PVC, so that the bleed of the additive in the sealant layer is not visible for 24 months at room temperature.

  The base material may be a single layer or a multilayer, and the barrier layer may be formed on either surface of the base material, or may be a laminated surface of a sealant layer.

  The substrate layer 11 is preferably a uniaxially stretched or biaxially stretched polyamide film, a polyester film, or a polyolefin film (Claim 2).

  The coating agent that is coated on the base material layer 11 to form the barrier layer 15 is preferably a hybrid coating agent obtained by combining an organic polymer compound and an inorganic compound or an acrylic acid organic polymer compound. (Claim 3) Preferably, the inorganic substance deposited on the base material layer to form the barrier layer 15 is any one of aluminum, alumina, and silica (Claim 4).

  The sealant layer 12 is preferably a linear low-density polyethylene (Claim 5), and the sealant layer 12 preferably has a lubricant concentration of less than 500 ppm or no additive (Claim 6). The thickness of the sealant layer is preferably 40 μm or more and 120 μm or less (Claim 7).

  In addition, the laminated film 1 of the present invention described above includes the base material layer 11 and the sealant layer 12 by various processing methods such as dry laminating processing or extrusion laminating processing through various known adhesives or anchor coating agents. It can be manufactured by stacking.

  Moreover, the package of the present invention is characterized in that the laminated film 1 of the present invention is a bag that can be sealed by overlapping the sealant layers 12 and heat-sealing them (Claim 8). .

  According to the laminated film 1 of the present invention, since the oxygen permeability is low and the gas barrier property is high, the garment after dry cleaning is removed from the package manufactured using the laminated film 1 with an oxygen scavenger. By sealing together with the desiccant, it is possible to prevent insect worms and mold growth even in a hot and humid environment.

  Further, since the laminated film 1 has high puncture strength and excellent pinhole resistance, a pinhole is generated in the package due to stress from the inside or outside of the package and the gas barrier property is impaired. Can be suitably prevented.

  Furthermore, since the laminated film 1 has a suitable slipperiness, it is preferably packaged when a cloth product or leather product as a content is contained in a package manufactured using the laminated film 1. Can do.

  In order to achieve bleed resistance, the sealant should have a lubricant concentration of 500 ppm or less, more preferably 200 ppm or less or no addition, and at least one of the base material and the sealant to achieve the oxygen permeability. It must be coated or vapor deposited. In order to achieve the piercing strength, the sealant preferably has a thickness of 40 μm or more and less than 120 μm.

  Furthermore, by overlapping the sealant layers 12 of the laminated film 1 of the present invention and performing heat sealing, a bag can be easily formed, and this bag is used as a package for packaging various contents. Can be used. Examples of the contents include cloth products such as clothing, leather products, and various products that require gas barrier properties for storage, such as powdered drugs and paper.

  Since the sealant layer 12 has an appropriate strength and good heat sealability, the bag body obtained by heat sealing the sealant layer 12 preferably maintains the hermetic state for a long period of time. be able to.

  In addition, since the laminated film 1 of the present invention does not contain a chlorine component such as a chlorine compound, the laminated film and the package made of the laminated film are used and then incinerated when discarded. There is no generation of harmful substances such as chlorinated compounds, and it can be said that it is preferable from the environmental viewpoint.

  The laminated film 1 of the present invention comprises a base material layer 11, a barrier layer 15, and a sealant layer 12 made of polyolefin, and consists of the base material layer 11, the barrier layer 15, and a sealant layer made of polyolefin, It comprises a barrier layer 15 formed by coating an organic polymer compound and / or an inorganic compound or depositing an inorganic substance on the surface of the substrate layer 11 or between the substrate layer 11 and the sealant layer 12.

  Hereinafter, the laminated film 1 of the present invention and a package body composed of the laminated film will be described.

[Base material layer]
The base material layer 11 serves as a base material for the laminated film, and when the laminated film is used as a package, it constitutes an outer layer of the package, such as clothing and leather products housed in the package. In order to keep the contents suitable for a long period of time, it is necessary to have various properties.

  Specifically, the base material layer 11 is provided with an appropriate strength so that the package made of the laminated film has durability against external stress, and pinholes and the like are generated by external stimulation. A material with high piercing strength shall be used so that it does not occur and does not impair the gas barrier property.

  Examples of the material capable of forming the base material layer 11 include a uniaxially stretched or biaxially stretched polyamide film, a polyester film, or a polyolefin film. In addition, from the viewpoint of preventing generation of harmful substances by incineration at the time of disposal, the base material layer 11 does not contain a chlorine compound.

  The base material layer 11 may have, for example, the surface of the base material layer 11 or the base material layer 11 and the sealant layer so as to have a gas barrier property so that oxygen or the like does not permeate inside the package. A barrier layer 15 is formed between the layers 12 by coating with an organic polymer compound and / or an inorganic compound or by depositing an inorganic substance.

  Examples of the coating agent forming the barrier layer 15 include a hybrid coating agent obtained by combining an organic polymer compound and an inorganic compound. In particular, “Savix” manufactured by Nippon Eco Wrap Co., Ltd. is a composite of a tough organic polymer resistant to bending and an oxygen-impermeable inorganic compound. It is a coating agent in which an inorganic compound is dispersed in nano-order units in a polymer layer. Yes, suitable for use. In addition, “Co-Barrier” manufactured by Kojin Co. can be used.

  In addition, an organic polymer compound can be used alone as the coating agent, and examples of the organic polymer compound include acrylic resins.

  As a method for coating the surface of the base material layer 11 with the hybrid coating agent or the organic resin, a general method such as gravure roll coating can be used.

  In addition, examples of the inorganic material forming the barrier layer 15 include aluminum, alumina, silica, and the like, which are deposited on the base material layer 11.

  Moreover, it is preferable that the thickness of the said base material layer shall be 10-30 micrometers.

[Sealant layer]
The sealant layer 12 forms an inner layer of the package when the laminated film 1 is used as a package, and functions as a heat seal layer in processing the package.

  Therefore, the sealant layer 12 preferably has heat sealability and high heat seal strength, and has appropriate strength and piercing strength so as to have durability against stress from inside the package. A material provided with is used.

  As an example, polyolefin resins such as polyethylene can be mentioned, and in particular, a linear low density polyethylene film can be used.

  The sealant layer 12 also does not contain a chlorine-containing polymer from the viewpoint of preventing the generation of harmful substances, like the base material layer 11.

  In addition, the concentration of the lubricant contained in the sealant layer 12 is preferably less than 500 ppm or not added so that the additive of the sealant layer 12 does not contaminate the contents.

  The thickness of the sealant layer 12 is preferably 40 μm or more from the viewpoint of maintaining the piercing strength, and preferably 120 μm or less in consideration of workability.

[Middle layer]
The laminated film 1 of the present invention can be constituted by laminating two layers of the base material layer 11 and the sealant layer 12, but may have a layer in addition to the two layers. An intermediate layer may be provided between the material layer 11 and the sealant layer 12. As the intermediate layer, materials usable for the base material layer 11 can be used.

〔Production method〕
When the base layer 11 and the sealant layer 12 and the intermediate layer are provided, the intermediate layer can be laminated by using various known laminating methods and processing devices. For example, dry laminating Method and extrusion laminating method.

  As the adhesive used in the lamination, various known adhesives used in each laminating method can be used. For example, in dry laminating, a polyester-based or polyether-based dry adhesive is used. When the laminating adhesive is extrusion laminated, various anchor coating agents for extrusion laminating can be used. Note that the adhesive and the anchor coating agent also do not contain a chlorinated polymer from the viewpoint of preventing the generation of harmful substances during disposal.

  The laminated film 1 in which the base material layer 11 and the sealant layer 12 are laminated with these adhesives and anchor coat agents is preferably used at a temperature of 20 ° C. to 70 ° C. for 6 to 48 hours, more preferably 40. Aging is performed for 12 to 48 hours at -60 ° C to stabilize the adhesion state.

[Laminated film]
The laminated film 1 obtained as described above has an oxygen permeability of less than 100 ml / m ² · 24 hrs · MPa, a puncture strength of 7 N or more, a dynamic friction coefficient of less than 0.5, and a normal temperature of 24 It can be made so small that the bleed of the additive in the sealant layer is not visible over a period of months.

That is, when the oxygen permeability is 100 ml / m ² · 24 hrs · MPa or more, when a package made of the laminate film is used, the oxygen content inside the package Oxygen concentration may cause growth of aerobic molds, etc. In addition, when the piercing strength is 7N or less, pinholes are generated by stimulation from the outside or inside of the package, and the deoxygenation effect This is because no longer can be obtained. Furthermore, if the dynamic friction coefficient is 0.5 or more, it is difficult to fill the contents.

[Packaging]
The laminated film 1 of the present invention can be formed into a bag having a predetermined shape and a predetermined size by overlapping and heat-sealing so that the sealant layer 12 is inside.

  As for the method of forming the bag body by the heat sealing, various known methods and apparatuses can be used. After the laminated film is cut into a predetermined size, the two sheets are superposed and heat sealed. It can be formed by various methods such as folding a series of laminated films 1 serving as a raw fabric, and then heat-sealing them.

  Since the bag body formed thereby has a high gas barrier property, it can be used as a package body that can be stored in a sealed state for a long period of time. The cloth product (clothing etc.) or leather product from which the dirt is wiped off can be sealed with an oxygen scavenger.

  In addition to the clothing and leather products, powder chemicals, paper, etc., which require a gas barrier property such as oxygen when stored, can be suitably used as a packaging bag for relatively lightweight items.

  The laminated film 1 for packaging of the present invention was subjected to oxygen permeability, additive bleed inspection, friction coefficient measurement, and puncture strength measurement.

  The laminated film and the package of the present invention are not limited to the examples shown below, and various modifications can be made within the scope of the object of the present invention.

Example 1
Biaxially stretched polyamide film hybrid-coated as the base material layer 11: “Savix YON-H2” (thickness 15 μm) manufactured by Nippon Eco Wrap, and linear low density polyethylene film as the sealant layer 12: “FCS” manufactured by Tosero (thick) 80 μm) was used as an adhesive for dry laminating, and a polyester adhesive was appropriately used according to the implementation to produce a laminated film 1 by dry laminating.

(Example 2)
Biaxially stretched polyamide film coated with an organic resin (acrylic acid) as the base material layer 11: “Besera RA” (thickness 16 μm) manufactured by Kureha Chemical Industry, and the lubricant concentration as the sealant layer 12 to about 200 ppm to 400 ppm A laminated film 1 was produced from the linear low-density polyethylene film (thickness: 80 μm) by dry lamination using the above adhesive.

(Example 3)
Polyester film on which aluminum is deposited as the base layer 11: “Tetrait JC” (thickness 12 μm) manufactured by Oike Kogyo Co., Ltd. Biaxially stretched polyamide film: “Toyobo Harden” manufactured by Toyobo Co., Ltd. as the intermediate layer (second base layer) Film N1200 ”(thickness: 15 μm), linear low density polyethylene film as sealant layer 12: Tosero“ FCS ”(thickness: 80 μm), and the above adhesive were used to produce laminated film 1 by dry lamination. .

Example 4
Biaxially stretched polyamide film hybrid-coated as the base material layer 11: “Savix YON-H2” (15 μm thick) manufactured by Nippon Eco Wrap, and linear low-density polyethylene resin for extrusion lamination as the sealant layer 12: manufactured by Sumitomo Chemical A laminated film 1 was produced by extrusion lamination using “Sumikasen Hiα” (thickness 60 μm) as an anchor and an anchor coating agent for extrusion lamination: “Takelac” made by Mitsui Takeda Chemical.

  The following laminated film was manufactured as a comparative example with respect to Examples 1 to 4 described above.

(Comparative Example 1)
A laminated film similar to that of Example 1 was produced except that a biaxially stretched polyamide film: “Toyobo Harden Film N1102” (thickness 15 μm) manufactured by Toyobo was used as the base material layer 11.

(Comparative Example 2)
A biaxially stretched polyamide film coated with polyvinylidene chloride as the base material layer 11: A laminated film similar to Example 1 was produced except that “Senesi KON # 1000” (thickness 15 μm) manufactured by Daicel Chemical Industries, Ltd. was used. .

(Comparative Example 3)
A laminated film similar to Example 1 was produced except that a linear low density polyethylene film: “LS10C” (80 μm thickness) manufactured by Thermo was used as the sealant layer 12.

(Comparative Example 4)
A laminated film similar to Example 1 was produced except that a biaxially stretched polyester film: “Toyobo Ester Film E5100” (thickness 15 μm) manufactured by Toyobo was used as the base material layer 11.

The configurations of Examples 1 to 4 and Comparative Examples 1 to 4 are summarized as follows.

  The laminated films 1 of Examples 1 to 4 and the laminated films of Comparative Examples 1 to 4 were aged for 24 hours at 40 ° C., and the following tests were conducted using this as a sample.

(Oxygen permeability measurement)
According to JIS K 7126, the amount of oxygen permeating through a laminated film of a certain area at 23 ° C. and a humidity of 65% RH was measured.

As a result, the following results were obtained.

  From the above results, Comparative Example 1 and Comparative Example 4 do not have an oxygen barrier property because a large amount of oxygen permeates, and when a cloth product or leather product is packaged with such a laminated film, the storage location or Mold is generated depending on the state of the contents, and it is considered that the growth of the mold cannot be suppressed. This is because the base material layer 11 is not coated with an organic resin, an inorganic compound, or the like, and oxygen permeation cannot be prevented.

  On the other hand, it was confirmed that Examples 1 to 4 and Comparative Examples 2 and 3 have oxygen barrier properties that can sufficiently meet the object of the present invention.

[Additive bleed test]
After making a packaging bag that is heat-sealed on three sides with a size of 10 cm × 10 cm and a seal width of 10 mm using the above laminated film, and about 8 cm × 8 cm black cotton cloth (about 2 g) is put in the packaging bag The mouth was sealed by heat sealing with a width of 10 mm, and this was left in a constant temperature and humidity chamber at 40 ° C. and a humidity of 80% RH for 3 months.

  Then, the black cotton cloth was taken out to see if the black cotton cloth was contaminated by the additive bleed from the laminated film, and the color was observed.

As a result, the following results were obtained.

  From the above results, in the laminated film of Comparative Example 3, since the additive bleeded from the laminated film within 1 year adheres to the contents to be packaged and contaminates the contents, it is used as a package. Can not do it. Note that the LS10 bleedability is x because the content of the film additive was contaminated due to the large amount of lubricant, especially the formulation of the film additive.

  Further, in Examples 1 to 4 and Comparative Examples 1, 2, and 4, it was confirmed that there was no concern about content contamination due to additive bleeding even after storage at room temperature for 1 year.

(Dynamic friction coefficient measurement)
According to JIS K 7125, measurement was performed by a flat plate method using a 200 g thread.

  In all examples and comparative examples, the dynamic friction coefficient was 0.3 to 0.4, and it was confirmed that the slipperiness required by the present invention was satisfied.

[Puncture strength measurement]
According to JIS K 1707, the strength at the time of piercing at a speed of 500 mm / min was measured using a pin having a tip shape of 1 mmφ.

  In all examples and comparative examples, the puncture strength was 10 to 20 N, and it was confirmed that the puncture strength and pinhole resistance required by the present invention were satisfied.

[Overall results]
As described above, it can be said that Examples 1 to 4 and Comparative Example 2 satisfy the physical properties required by the present invention in all of the oxygen barrier properties, non-bleed properties, slip properties, and pinhole resistance.

  However, in Comparative Example 2, since a chlorine compound is used as the coating agent for the base material layer 11, if the laminated film of Comparative Example 2 is incinerated at a low temperature, dioxins harmful to the human body may be generated. There is an environmental problem.

On the other hand, in Examples 1-4, since it does not contain any chlorine compound, there is no concern about the generation of dioxins, and the environmental load can be reduced.

  Therefore, according to the laminated film of the present invention, it is possible to produce a package that can be suitably used for packaging fabric products (clothing), leather products, and chemicals and papers that require oxygen barrier properties during storage. can do.

The schematic sectional drawing which shows one Example of the laminated | multilayer film of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Laminated film 11 Base material layer 12 Sealant layer 15 Barrier layer

Claims (8)

It consists of a base material layer, a barrier layer, and a sealant layer made of polyolefin,
An organic polymer compound and / or an inorganic compound is coated on the surface of the base material layer or between the base material layer and the sealant layer, or a barrier layer is formed by depositing an inorganic substance;
A laminated film characterized by having an oxygen permeability of less than 100 ml / m ² · 24hrs · MPa, a puncture strength of 7N or more, a dynamic friction coefficient of less than 0.5, and no chlorine compound in the resin structure.   The laminated film according to claim 1, wherein the base material layer is a uniaxially stretched or biaxially stretched polyamide film, a polyester film, or a polyolefin film.   3. The coating agent which is coated on the base material layer to form a barrier layer is a hybrid coating agent or an organic polymer compound formed by combining an organic polymer compound and an inorganic compound. Laminated film.   The laminated film according to any one of claims 1 to 3, wherein the inorganic material forming the barrier layer is aluminum, alumina, or silica.   The laminated film according to any one of claims 1 to 4, wherein the sealant layer is a linear low density polyethylene.   The laminated film according to any one of claims 1 to 5, wherein the sealant layer has a lubricant concentration of less than 500 ppm or no additive.   The thickness of the said sealant layer is 40 micrometers or more and 120 micrometers or less, The laminated film of any one of Claims 1-6 characterized by the above-mentioned. The package body characterized by making the laminated | multilayer film of any one of the said Claims 1-7 into the bag body which can be sealed by overlaying the said sealant layers and heat-sealing.

Images