JP2002113828A - Laminated material for packaging and package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminated material for packaging which has gas- permeability and moisture-permeability, is produced easily, has no problems of the lowering of gas permeability and odors caused by an adhesive, is excellent in strength, prevents the leakage of functional goods such as a deoxidizer and a moisture absorbent when the goods are packaged, is excellent in sealing properties, is high in productivity, and is capable of high speed continuous packaging and a package using the material. SOLUTION: In the laminated material, a gas-permeable heat-resistant fiber raw material layer having heat resistance of at least 150 deg.C, a polyethylene resin spun-bond nonwoven fabric layer, and a porous film are laminated in turn by heat-adhesion. The fiber raw material layer is, for example, a resin spun-bond nonwoven fabric having a melting point of 150-300 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laminated material for packaging and a package using the laminated material, and more particularly to a package for packaging functional articles such as a deoxidizer, a desiccant and a dehumidifier. The present invention relates to a laminated material for use and a package using the laminated material.

[0002]

2. Description of the Related Art Recently, oxygen scavengers, desiccants, and the like are often used to prevent spoilage, deterioration, and deterioration of processed foods. As the oxygen absorber, a powdery or granular oxygen absorber (oxygen absorber) stored in a gas-permeable small bag is used. Similarly, confectioneries such as rice crackers, which have reduced product value such as texture due to moisture absorption, and laver, are also packaged together with articles packed in a bag with a desiccant such as silica gel.

[0003] That is, a package of these functional agents is
In order to absorb air, moisture, oxygen, etc. inside the package (bag) of the article, it is packaged with a breathable packaging material. Similarly, air-permeable packaging materials are used for fragrances, insect repellents, and the like, in which the active ingredient generated from the packaging agent permeates the packaging material and acts. Recently, adsorbents such as odors including powders of activated carbon and charcoal are often packaged in large-area sheets and used in hospital beds and the like. In addition, with the expansion of trade in electronic and electrical equipment, medical equipment, precision equipment, etc., large-sized packaging desiccants and oxygen scavengers have been used to prevent such moisture and oxidation and stabilize quality. I have.

[0004] These air-permeable packaging materials are intended to prevent leakage of the packaging material such as a powder, to have sufficient heat sealing strength of the packaging, and to be suitable for filling and packaging, that is, high sealing strength and stable sealing strength. It is required to be able to perform continuous packaging at high speed. Further, when the content is a deliquescent moisture absorbent, waterproofness is also required. In particular, there is a need for a packaging material that can be applied from small packages such as oxygen scavengers and moisture absorbents to large packages such as activated carbon and charcoal, and has appropriate waterproofness, moisture permeability and air permeability.

[0005] For example, (1) Japanese Patent No. 293667 discloses a breathable packaging material used for these packages, which comprises a paper layer and a nonwoven fabric layer composed of a sheath-core type composite fiber.
The nonwoven fabric discloses a composite sheet comprising a composite fiber having a sheath component having a melting point of 160 ° C. or lower and a core component having a melting point of 30 ° C. or higher than the sheath component. This composite sheet is heat-sealed to paper with the sheath component of the non-woven fabric, and the interlayer adhesion cooperation is 400 g / 15 m.
m width or more.

However, this composite sheet uses a sheath-core composite fiber non-woven fabric, and it is difficult to produce the non-woven fabric stably due to the difference in melt viscosity of the sheath-core resin and compatibility. is there. In addition, the sealing performance is not enough,
It may be difficult to increase the packaging speed. In addition, in lamination and heat sealing, the low melting point resin which is the sheath component resin of the conjugate fiber is dominant, and there is a limit to the temperature conditions and the like at the time of lamination and also to the sealing property at the time of heat sealing. .

[0007] (2) Japanese Patent Application Laid-Open No. 10-235817 discloses a packaging material for a plate-shaped oxygen absorbent using a fibrous nonwoven fabric (warif) made of polyethylene resin for the inner layer, water-absorbing paper for the intermediate layer, and paperboard for the outer layer. Is disclosed. However, the manufacturing process of this packaging material is complicated, for example, it requires a process of making a large number of fine holes with a diameter of about 0.5 mm in the warif in order to make the material air-permeable. In addition, the adhesiveness between the warif layer and the paper layer is low, and as shown in the examples, it is necessary to substantially use a sandwich lamination using a polyethylene resin. There is a problem that control is difficult.

[0008] As a breathable material, a microporous film obtained by stretching a polyethylene film containing an inorganic filler is known. However, this microporous film is known to be used as a laminated material with a nonwoven fabric because of insufficient strength.

For example, (3) Japanese Patent No. 2736773 discloses that a non-contact portion of a long fiber spunbonded nonwoven fabric having an air permeability of 30 to 100 g / m ² obtained by applying an adhesive to the microporous film is used. A method for producing a sheet material for windproof lamination is disclosed in the publication of a ventilation method for an outer wall of a wooden house which is bonded and left. Similarly, (4) JP-A-4-34
No. 8931 discloses that the air permeability is 5000 sec / 100c.
c or less, a nylon or polyester-based nonwoven fabric having a basis weight of 20 to 50 g / m ² is attached to the microporous film having a thickness of 35 to 100 μm by point bonding with an adhesive application area of 10 to 30%. Applications such as body and rain gear are disclosed.

[0010] (5) JP-A-11-972 discloses a laminate with a polyolefin nonwoven fabric having a basis weight of 5 to 20 g / m ² , an average fiber diameter of 0.2 to 2 denier and a bulk specific gravity of 0.05 or less. , (6) JP-A-11-99601 discloses that
A composite film in which the state of adhesion by a hot melt adhesive is quantified is disclosed, and use of a disposable diaper or a sanitary napkin for a back sheet is disclosed.

[0011] In any case, these multilayer materials use an adhesive, which reduces the complexity and environmental problems of the process, the odor of the adhesive, and the decrease and fluctuation of air permeability and moisture permeability in the laminating process. Conceivable.

(7) JP-A-6-316022 discloses a laminate in which a polyolefin-based porous film, a polyolefin-based nonwoven fabric, and a polyolefin-based split-fiber nonwoven fabric are integrated by heat bonding. 76386
Japanese Patent Application Laid-Open Publication No. H11-139,086 discloses a moisture-permeable sheet obtained by laminating a microporous polyolefin moisture-permeable resin film and a nonwoven fabric by partial thermal fusion, and clothing and absorbent articles using the laminate. In the case of absorbent articles such as clothing and disposable diapers in this case, heat sealing properties, heat sealing strength, and the like rarely cause any problem even if the secondary processing is performed using the laminate obtained by heat fusion.

That is, the laminated material using the conventional microporous polyolefin resin film is intended to improve the strength and heat sealability of the microporous polyolefin resin film by laminating with a nonwoven fabric. Therefore, the laminating means does not pose any problem as long as the air permeability and the adhesion are ensured even by the adhesive or by the heat fusion.

However, when a microporous polyolefin-based resin film is used as a substitute for paper for packaging a functional agent such as an oxygen scavenger or a desiccant, not only air permeability and moisture permeability, but also fine powder leakage prevention properties are required. In addition, sealability and seal strength are very important. This is because packages of these functional agents are packaged with foods mainly to prevent oxidation and moisture absorption of the foods. Therefore, if an oxygen scavenger or a desiccant comes into contact with or mixes with food, the safety of the food is threatened. Therefore, it is necessary to surely and stably heat seal so that the oxygen scavenger and the desiccant do not leak. Also, such a reliable heat seal,
It is desired to efficiently package the package. For this reason, the conventional two-layer laminated material may not be able to cope sufficiently.

[0015]

DISCLOSURE OF THE INVENTION The present invention has waterproofness, moisture permeability, moderate air permeability, is easy to manufacture, has no problem of deterioration of air permeability and odor due to an adhesive, and has high strength. Packaging material having excellent properties such as excellent oxygen scavenger, moisture absorbent, etc., is hardly leaked, has excellent sealing properties, is highly productive, and is capable of high-speed continuous packaging. An object is to provide a package using a material.

[0016]

Means for Solving the Problems The present inventors diligently studied the heat sealing property for forming a package (bag) while making use of the moisture permeability, air permeability and waterproofness of a microporous film. As a result, by using a three-layer laminated material having a polyethylene-based spunbonded nonwoven fabric layer between the microporous film and the gas-permeable heat-resistant fiber material layer, lamination can be easily performed by thermal bonding, and the package body and It has been found that the heat sealing process is excellent in sealing strength, high-speed continuous filling and packaging can be performed with high productivity, and is particularly suitable for packaging various functional agents used for food packaging and deliquescent components. The present invention has been completed based on this finding. Further, the present invention has found that the heat sealing strength can be improved by further laminating a heat-permeable material to the above three-layer laminated material.

That is, the present invention relates to (1) a packaging material in which a breathable heat-resistant fiber material layer having a heat resistance of 150 ° C. or more, a polyethylene-based resin spunbonded nonwoven fabric layer and a microporous film are laminated in this order by thermal bonding. Laminated material. (2) The laminated material for packaging according to (1), wherein the breathable heat-resistant fiber material layer is made of a resin spunbonded nonwoven fabric having a melting point of 150 to 300 ° C. (3) The polyethylene resin has a density of 880 to 950 kg
/ M ethylene -α- olefin copolymer is ³ (1) or packaging laminate material according to (2). (4) A packaging laminate material in which a breathable heat-resistant fiber material layer having a heat resistance of 150 ° C. or higher, a polyethylene-based resin spunbond nonwoven fabric layer, a microporous film, and a gas-permeable material are laminated in this order by thermal bonding. (5) The laminated material for packaging according to (4), wherein the breathable heat-resistant fiber material layer is made of a resin spunbonded nonwoven fabric having a melting point of 150 to 300 ° C. (6) The polyethylene resin has a density of 880 to 950 kg.
(4) or (5), which is an ethylene-α-olefin copolymer having a ratio of / m ³ . (7) The laminated material for packaging according to (4) to (6), wherein the breathable material is a nonwoven fabric. (8) The packaging laminate material according to (7), wherein the nonwoven fabric is a spunbonded nonwoven fabric or a split-fiber nonwoven fabric. (9) The laminate material for packaging according to any one of (1) to (8), wherein the microporous film is a polyethylene resin. (10) A package using the packaging laminate material according to any one of (1) to (9). (11) A package of an oxygen absorber, a desiccant, a desiccant, a deodorant, a heating agent, an insect repellent, a dehumidifier, or a fragrance, using the packaging laminate material according to any one of (1) to (10). .

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail. The packaging laminate material of the present invention is formed by heat-bonding a breathable heat-resistant fiber material layer having a heat resistance of 150 ° C. or more, a polyethylene resin spunbond nonwoven fabric layer and a microporous film, particularly a polyethylene resin microporous film in this order. Is a laminated material for packaging laminated by the following method. Here the thermal bonding
Preferably, they are bonded by a hot embossing roll method.

The use of this packaging material for lamination makes it possible to employ the simplest and cheapest laminating means by thermal bonding, especially the hot embossing roll method. Further, in the packaging of an article using the laminated material, it is possible to obtain a package with good heat sealability.

Here, as the breathable heat-resistant fiber material layer having heat resistance of 150 ° C. or higher, fibers made of a thermoplastic resin are generally used.
Homopolyesters such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, and polytrimethylene terephthalate, such as a random copolymer with a monomer such as ethylene or butene-1 of not more than mass%, and other components containing these as a main component unit. Polyester fibers such as copolymerized copolyesters and mixed polyesters thereof, nylon 6 (polycaprolactamide), nylon 6,6 (polyhexamethylene adipamide), nylon 6,10 (polyhexamethylene sebaca) Amide), nylon 11 (polyundecaneamide), nylon 7 (poly-ω-aminoheptanoic acid), nylon 9 (poly-ω-aminononanoic acid), polyamide fiber such as nylon 12 (polylaurinamide). it can.

Other fiber materials other than the thermoplastic resin fibers include non-melting fiber materials such as wood pulp, mulberry, honey and rayon fibers. These breathable heat-resistant fiber material layers are made of heat-resistant fiber material, and there are no particular restrictions on woven fabric, nonwoven fabric, knitted fabric, paper, etc., but the spunbonded nonwoven fabric made of the thermoplastic resin has strength, elongation, flexibility, It is preferably used because it is inexpensive.

The fiber diameter of the spunbonded nonwoven fabric is not particularly limited, and is usually 5 to 60 μm, preferably 10 to 4 μm.
0 μm, and the basis weight is usually 10 to 100 g / m 2.
² , preferably 15 to 80 g / m ² . 10g / m
^If it is less than ² , the effect of preventing edge breakage at the time of heat sealing is not sufficient, and if it exceeds 100 g / m ² , productivity decreases during lamination by thermal lamination, which is not preferable. That is, when a laminated material is formed, the polyethylene resin spunbonded nonwoven fabric is melted, penetrates into the heat-resistant fiber material layer, and is laminated by heat fusion with the microporous film, which is required. The heat resistant fiber material layer is selected in consideration of the sealing strength and the productivity at the time of lamination.

The polyethylene spunbonded nonwoven fabric is not particularly limited, and may be a homopolymer of ethylene, a copolymer of ethylene with a copolymerizable monomer such as an α-olefin, an unsaturated carboxylic acid or a derivative thereof, or a cyclic olefin. Examples thereof include polymers and high-pressure branched low-density polyethylene. Among them, copolymers (LLDPE) of ethylene and propylene, butene-1, 4-methyl-pentene-1, hexene-1, octene-1, and other α-olefins having 3 to 10 carbon atoms can be preferably exemplified. As these polyethylene resins, (co) polymers polymerized using a Ziegler catalyst using titanium or the like, (co) polymers polymerized using a metallocene catalyst, and the like are used.

In particular, the density is preferably 880-960
kg / m ³ , more preferably 900 to 950 kg /
m ³ , melting point of 80 to 140 ° C., preferably 90 to 130
℃ range, melt flow rate (MFR) is 5-60
The above-mentioned ethylene-α-olefin copolymer in the range of g / 10 minutes, preferably 10 to 50 g / 10 minutes is preferably used in view of spinnability, melting point, strength and the like.

Here, the polyethylene resin spunbond nonwoven fabric has a fiber diameter of usually 5 to 60 μm, preferably 10 to 60 μm.
４０40 μm, and the basis weight is 10 to 200 g /
m ² , preferably 15 to 150 g / m ² , more preferably 20 to 100 g / m ² .

These heat-resistant resin spunbond nonwoven fabrics,
Polyethylene resin spunbond non-woven fabric, for example,
These resins are melt-extruded from an extruder, spun from a spinneret, the spun fibers are taken up by an air current pulling device such as air soccer, opened if necessary, and the fibers are collected together with the air current into a web collecting device such as a net conveyor. And, if necessary, can be obtained by a known method by partially welding with a heating means such as heated air or a heated roll. In the production of the spunbonded nonwoven fabric, a laminate of the polyethylene resin spunbonded nonwoven fabric and the above-described heat-resistant fiber material layer having a heat resistance of 150 ° C. or more can be laminated in-line.

Next, the microporous film used in the present invention is not particularly limited, and the production method is arbitrary as long as it is usually a polyolefin resin microporous film, especially a polyethylene resin microporous film. Yes, a known film is used. This polyolefin-based resin microporous film is, for example, a filler or a plasticizer eluted with a solvent from a film made of a polyolefin-based resin containing an inorganic filler, an organic filler, a plasticizer, or the like to have a microporous structure. The method includes a film obtained by stretching a film made of a polyolefin-based resin containing an inorganic filler or an organic filler in at least one direction.

Among these, a film obtained by stretching a film made of a polyolefin-based resin containing an inorganic filler or an organic filler described later in at least one axis direction is preferably used. Examples of the polyolefin resin used in the present invention include high-density polyethylene, medium-density polyethylene, ethylene-α-olefin copolymer, high-pressure low-density branched polyethylene, polypropylene, and copolymers of propylene and other olefins. And mixtures of polyolefins. Especially, a polyethylene resin is preferable.

The density of the polyethylene resin is as follows:
Usually 880 to 960 kg / m ³ , preferably 900 to 9
50 kg / m ³ , melt flow rate (MFR) [JI
Based on SK7210, measurement temperature: 190 ° C, measurement load:
21.18N], usually 0.01 to 10 g / 10
Min, preferably 0.02 to 5 g / 10 min.

As the filler contained in the polyolefin resin, an inorganic or organic filler is used, for example, calcium carbonate, talc, clay, kaolin, silica, diatomaceous earth, magnesium carbonate, barium carbonate, barium sulfate, calcium sulfate , Calcium sulfite, calcium hydroxide, magnesium hydroxide, aluminum hydroxide,
Inorganic fillers such as zinc oxide, calcium oxide, magnesium oxide, titanium oxide, mica, alumina, zeolite, and glass powder, and organic fillers such as wood powder, cellulose powder, high melting point resin powder, and crosslinked resin powder are used.

The average particle size of these fillers is usually 30 μm or less, preferably in the range of 0.2 to 10 μm. Here, if the particle size is too small, dispersibility and moldability are poor, and if it is too large, the microporous denseness of the stretched film deteriorates, and the powder leakage resistance may decrease. They are,
If necessary, a plurality may be contained. These fillers may be surface-treated with a fatty acid or a fatty acid metal salt in order to improve dispersibility in a polyolefin-based resin and stretchability of a film.

Here, the content of the inorganic filler is 20 to 400 parts by mass, preferably 40 to 300 parts by mass with respect to 100 parts by mass of the polyolefin resin. Here, when the content of the filler is less than 20% by mass, the formation of microporosity when the film is stretched is not sufficient, and the moisture permeability is not sufficiently ensured. If the amount exceeds 400 parts by mass, kneading properties, dispersibility, film forming properties may be reduced, and strength may be reduced.

Further, if necessary, other resins, elastomers and various additives commonly used for the filler-containing polyolefin resin film can be blended. For example, ethylene-propylene copolymer elastomer, liquid or solid hydrocarbon resin, active hydrogen-containing liquid polybutadiene, plasticizer, radical generator, heat stabilizer, ultraviolet absorber, higher fatty acid, ester, amide, metal Lubricants such as salts, coloring agents, flame retardants and the like can be exemplified.

The polyolefin resin is pelletized together with a predetermined amount of a filler and various additives using a Banbury mixer, a kneading extruder or the like. Using these pellets, a film is formed using a T-die extrusion molding machine and an inflation molding machine. The formed film is stretched about 1.5 to 10 times at least in a uniaxial direction. Stretching may be performed in multiple stages or biaxially.

The film is stretched from a temperature 100 ° C. lower than the melting point of the polyolefin resin to a temperature 20 ° C. lower than the melting point.
Performed in the lower temperature range. This stretching improves the strength of the film and forms microporosity. The dimensional accuracy of the stretched film can be improved by heat-treating the stretched film. Further, a surface treatment for improving adhesiveness such as a corona treatment and a frame treatment can be performed on the laminated surface of the film.

The thickness of the polyolefin resin microporous film thus obtained is 10 to 20.
0 μm, preferably 15 to 100 μm. The moisture permeability of this film is usually 100 g / m ² · 24 hours or more, preferably 500 g / m ² · 24 hours or more. The measuring method will be described later. In order to satisfy these characteristics, it is desirable to have micropores having an average diameter of 0.1 to 50 μm and a porosity of about 10 to 80%.
The film thickness and the moisture permeability of the polyolefin-based resin microporous film can be determined based on the required characteristics depending on the article to be packaged using the laminated material of the present invention and its use.

Such a polyolefin resin microporous film itself is known, and various films can be easily obtained from the market. For example, as a polyethylene stretched moisture-permeable film containing an inorganic filler, "Poram PU35" manufactured by Tokuyama Corporation, "Breslon" manufactured by Nitto Denko Corporation, and "Espoir" manufactured by Mitsui Chemicals, Inc. may be mentioned. it can.

The air-permeable material is air-permeable and can be heat-laminated with a microporous film.
Further, in order to reduce the edge breakage at the time of heat sealing and to function as a protective layer of the microporous film, it is desirable that the film has strength. The air permeability (air permeability) of the air-permeable material is 100 seconds / 100 cc or less, preferably 10 seconds or less, using a Gurley-type measuring method in accordance with JIS L 1096.
Seconds / 100cc or less. If the air permeability exceeds 100 seconds / 100 cc, the moisture permeability may be reduced, which may impair the performance of absorbing water as a dehumidifier.

As the material of the air-permeable material, a non-woven fabric can be used, and any known production method such as a spunbond method, a spunlace method, a hot air card method, and a hot embossed card method can be employed. Among them, the spun bond method is preferable from the viewpoint of strength, price, and the like. The basis weight is 10 to 100 g / m ² , preferably 15 to 70 g / m ^{2 in} terms of strength and price.
m ² is preferred.

Further, in the case of the nonwoven fabric, the layer constitution is a single layer,
Includes multiple layers. When considering the suitability for heat lamination, a multilayer nonwoven fabric of a high-melting-point resin nonwoven fabric layer / a low-melting-point resin nonwoven fabric layer is preferable. And as the material of the nonwoven fabric, P
Polyolefins such as P and PE, polyamides such as NY, P
Any known resin such as polyester such as ET can be used. In the case of the above-mentioned multilayer non-woven fabric, PET non-woven fabric / PE non-woven fabric is mentioned as a combination for obtaining a difference in melting point between layers. Examples of the nonwoven fabric include fibers using polyethylene terephthalate, polybutylene terephthalate, or the like as the core material and coating the periphery thereof with a polyolefin resin.

Further, as a material of the breathable material, a split fiber non-woven fabric can be used. Split-fiber non-woven fabric is a split fiber (flat yarn) that is made by drawing fine cracks into a stretched film made of polyolefin resin. These split fibers are laminated vertically and horizontally and heat-bonded or hot-melt bonded. A material made into a nonwoven fabric. Basis weight of the split fiber nonwoven fabric, strength, 10 to 100 g / m ² from the price point, preferably suitable 12~40g / m ^2. Further, as a stretched film to be used, a multilayer type having a low-melting resin layer / a high-melting resin layer / a low-melting resin layer is preferable in consideration of the suitability for heat lamination. Low-density polyethylene / high-density polyethylene / low-density polyethylene is preferable as a material that can be thermally laminated with the microporous film.

The laminated material for packaging of the present invention comprises the polyolefin-based resin microporous film obtained by the method described above,
Polyethylene resin spunbond nonwoven fabric and 150 ° C
The air-permeable heat-resistant fiber material having the above heat resistance is laminated by thermal bonding, and is preferably laminated by thermal bonding by a hot embossing roll method.

The lamination of the air-permeable heat-resistant fiber material layer, the polyethylene resin spun-bonded non-woven fabric layer and the microporous film is as follows:
Two layers can be laminated in advance. This pre-lamination
This is performed by using a hot flat roll method, preferably a hot emboss roll method. Above all, when a spunbonded nonwoven fabric having a melting point of 150 to 300 ° C. is used as the heat-resistant fiber material layer, lamination of a polyethylene resin spunbonded nonwoven fabric with a spunbonded nonwoven fabric of polypropylene, polyamide, polyester, etc. Can be laminated in-line, or can be integrally laminated at the time of lamination with a microporous film later.

The significance of the provision of the air-permeable heat-resistant fiber material layer is that when the microporous film and the polyethylene-based spunbond nonwoven fabric layer are laminated by the hot embossing roll method, the temperature (roll temperature) for thermal bonding is set. One of the roll temperature conditions can be set without being influenced by the melting point of the polyethylene resin spunbonded nonwoven fabric. Therefore, the condition range of the thermal bonding is widened and lamination is remarkably improved.

Further, at the time of heat sealing of the package, the heat-resistant fiber material layer does not melt and retains strength, so that the edge of the heat-sealed portion can be prevented from being cut. Thereby, excellent sealing performance is exhibited.

The melting point of the thermoplastic resin constituting each nonwoven fabric and film used in the present invention is JIS K 712.
DSC (PerkinElmer DSC7)
Mold), and a peak temperature when measured at a heating rate of 20 ° C./min. When the melting point appears as a plurality of peaks, the temperature at which the highest peak is shown is adopted. Further, the melt flow rate (MFR) of the polyethylene resin can be measured under the conditions of a measurement temperature: 190 ° C. and a measurement load: 21.18 N in accordance with JIS K7210.

The laminated material for packaging according to the present invention comprises, as described above, a laminate of a breathable heat-resistant fiber material layer and a polyethylene-based resin spunbonded nonwoven fabric, and a laminate of a microporous film and a polyethylene-based resin spunbonded nonwoven fabric. Is made.
Alternatively, three layers are simultaneously laminated by thermal bonding. The lamination method by thermal bonding is not particularly limited, and various lamination methods can be adopted. Since the packaging laminate material of the present invention is laminated by thermal bonding, it does not use an adhesive, does not have an odor due to the adhesive, has no decrease in air permeability, is simple, has a low processing cost, and is environmentally friendly. A hot embossing roll method having such characteristics as being easy to use is preferably used.

Here, in the hot embossing roll method, lamination can be performed using a known laminating apparatus using an embossing roll and a flat roll. Here, as the embossing roll, an embossing pattern of various shapes can be adopted, and there are a continuous lattice shape, an independent lattice shape, an arbitrary distribution, and the like in which each bonding portion is continuous.

Here, the lamination conditions of the hot embossing roll method include the type of microporous film, the spunbonded nonwoven fabric of polyethylene resin, the type of heat-resistant fiber material layer, the melting point,
It differs depending on the melting point difference of each layer resin and which layer is used as the embossed surface, and is appropriately selected in consideration of each element. Normally, thermal lamination is performed with the polyethylene resin spunbond nonwoven fabric surface facing the embossing roll and the microporous film surface facing the flat roll.

For example, the embossing roll temperature is usually 90 to 200 ° C., preferably 110 to 180 ° C., and the flat roll temperature is 90 to 200 ° C., preferably 110 to 1 ° C.
80 ° C temperature range, normal roll pressure (linear pressure) 100-5
00 N / cm, preferably 200 to 400 N / cm can be adopted. These emboss patterns, emboss area ratios, temperatures, pressures, and the like can be appropriately selected depending on the melting point, fiber diameter, thickness, basis weight, air permeability, lamination speed, and the like of the nonwoven fabric.

The laminated material for packaging of the present invention needs to have appropriate air permeability and moisture permeability necessary for the functional article to function. The air permeability and the moisture permeability vary depending on the use such as the type of the functional article and the size of the package, and are not particularly limited. Generally, the moisture permeability is 50 g / m ² ·
The material of each layer is appropriately selected within a range of 24 hours or more so that there is no possibility of leakage of the contents.

The laminated material for packaging of the present invention can be mainly used for packaging various functional articles such as oxygen absorbers and moisture absorbents. As for the package of these functional articles, the functional article only needs to function, and in the case of a bag-like package, at least a part of the bag, preferably one side of the bag is formed of the packaging material of the present invention. . In addition to the method using a heat seal bar, it is possible to heat and pressure bond thermoplastic resin, such as a continuous sealing method using rolls used in the bag making and sewing fields, in addition to the method using a heat seal bar for packaging. There is no particular limitation on the type as long as the sealing method is. The heating means may be heat conduction (heat jig, heating element), dielectric heating, ultrasonic heating, or the like.

The conditions of the heat sealing, such as temperature, pressure, time, and speed, are as follows: polyethylene resin spunbond nonwoven fabric, air-permeable heat-resistant fiber material layer, type of microporous film, heat resistance (melting point) Conditions can be set as appropriate along with the molecular weight, the molecular weight, the thickness or the basis weight of the nonwoven fabric or film.

The laminated material for packaging of the present invention can be suitably used for packaging of functional articles such as an oxygen scavenger, a desiccant, a moisture absorbent, a deodorant, a heating agent, an insect repellent, a dehumidifier or an aromatic. In particular, due to its excellent sealing properties, a deodorant such as charcoal or activated carbon can be applied to a sheet-like package having a relatively large area. In this case, a plurality of packages are usually formed into a continuous sheet.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. First Embodiment FIG. 1 shows a heat laminating apparatus 1 according to a first embodiment of the present invention. The heat laminating apparatus 1 includes a supply roll 4 for supplying the laminated sheet 10, a supply roll 5 for supplying the microporous sheet 13, a flat roll 6 for sandwiching the laminated sheet 10 and the microporous sheet 13, and an embossing roll. 7 and a winding roll 8 for winding the completed packaging laminate material 14.

Here, the laminated sheet 10 is formed by previously laminating a polyethylene resin spunbonded nonwoven fabric 12 and a gas-permeable heat-resistant fiber material 11 by thermal lamination. The supply rolls 4 and 5 and the winding roll 8 are
Any member can be adopted as long as a predetermined purpose is achieved. Further, the flat roll 6 has a smooth surface,
Further, a device having a heating means capable of arbitrarily changing the temperature can be adopted, and is disposed above the sheet to be pressed. Further, the flat roll 6 can be rotated by connecting to a driving means such as a motor.

The embossing roll 7 may be provided with an arbitrary embossing pattern on the surface and a heating means capable of changing the temperature arbitrarily. The embossing roll 7 is arranged below the sheet to be pressed. After the temperature of the flat roll 6 and the embossing roll 7 is increased, the configuration of the packaging laminated material 14 that can be inserted between the flat roll 6 and the embossing roll 7 is as follows. Polyethylene resin spunbond nonwoven fabric 1
2. The order of the microporous sheet 13 is as follows. A predetermined emboss pattern is formed on the surface of the microporous sheet 13 by the emboss roll 7.

As shown in FIG. 2, the completed packaging laminate material 14 has a layer of a breathable heat-resistant fiber material 11, a layer of a polyethylene resin spunbond nonwoven fabric 12, and a layer of a microporous sheet 13. .

A package (not shown) in which silica gel is packaged using the packaging laminate material 14 obtained as described above.
To manufacture. At the time of manufacturing, a method of sealing the peripheral portion of the packaging laminated material 14 by means such as heat sealing can be adopted.

According to the above-described embodiment, the following effects can be obtained. The laminated material for packaging 14 of the present invention has air permeability, moisture permeability, and fine powder barrier properties, has excellent sealing properties, and is suitable for packaging various functional articles such as an oxygen scavenger and a moisture absorbent. Further, since no adhesive is used for lamination, the manufacturing process is easy, and there is no decrease in air permeability, moisture permeability, odor, etc., and it can be applied to packaging of a wide range of functional articles.

[Second Embodiment] Next, a second embodiment of the present invention will be described. In the following description, the same parts as those already described are denoted by the same reference numerals, and description thereof will be simplified. FIG. 3 shows a thermal laminating apparatus 2 according to a second embodiment of the present invention. The thermal laminating apparatus 2
A supply roll 4 for supplying the laminated sheet 20, a supply roll 5 for supplying the microporous sheet 23, a supply roll 9 for supplying the permeable material 24, the laminated sheet 20, the microporous sheet 13 and the permeable material 24 , And a winding roll 8 for winding the completed packaging laminate material 25.

Here, the laminated sheet 20 is formed by previously laminating a polyethylene resin spunbond nonwoven fabric 22 and a gas-permeable heat-resistant fiber material 21 by thermal lamination. In addition, any member can be adopted as the supply roll 9 as long as a predetermined purpose is achieved.

Further, as the flat roll 16, similarly to the flat roll 6, a flat roll having a smooth surface and a heating means capable of arbitrarily changing the temperature can be adopted.
It is arranged below the sheet to be pinched. The configuration of the laminated packaging material 25 formed by laminating is, in order from the flat roll 6 side, a breathable heat-resistant fiber material 21, a polyethylene-based resin spunbond nonwoven fabric 22, a microporous sheet 23, and a breathable material 24 in this order.

As shown in FIG. 4, the packaging laminate material 25 to be completed is a layer of a breathable heat-resistant fiber material 21, a layer of a polyethylene resin spunbond nonwoven fabric 22, a layer of a microporous sheet 23, a layer of a breathable material. It has a configuration of 24 layers.

According to the present embodiment as described above, the following effects are obtained in addition to the effects of the first embodiment. By adding the layer of the gas permeable material 24 to the packaging laminate material 25, the strength is increased and the edge breakage at the time of heat sealing can be reduced.

In addition, specific structures, shapes, and the like when the present invention is implemented may be other structures and the like within a range that can achieve the object of the present invention.

[0067]

EXAMPLES Hereinafter, the packaging laminate material of the present invention will be described in detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples.

[Example 1] Production of Lamination Material for Packaging by Thermal Lamination Production was performed using the thermal laminating apparatus 1 of the first embodiment.
Heat laminating machine [Sansei Seiki Co., Ltd. heat laminator, oil temperature control, roll diameter: 300 mm, embossing roll / flat roll, embossing compression ratio: 21%, lattice pattern (pitch:
1.5mm), embossing pressure (linear pressure): 300 N / c
m, lamination speed: 15 m / min]. As the nonwoven fabric, as a polyethylene resin spunbond nonwoven fabric layer,
Idemitsu Petrochemical Co., Ltd. polyethylene spunbond nonwoven fabric [“Stratec” LN5020 (raw material: density: 940)
kg / m ³ ethylene-butene-1 copolymer, fiber diameter:
25 μm, basis weight: 20 g / m ² , melting point: 124 ° C.)
And a polyester spunbonded nonwoven fabric manufactured by Toyobo Co., Ltd. [“Ecure A” 630
1 (basis weight: 30 g / m ² , melting point: 260 ° C.)] to obtain a two-layer laminated nonwoven fabric by thermal lamination. Next, on the polyethylene non-woven fabric side of the two-layer non-woven fabric, as a microporous film, an inorganic filler-containing stretched PE moisture-permeable film “PORAM PU35” (thickness:
35 μm) were laminated by thermal lamination with the film surface as the embossed surface. The temperature range for thermal bonding is
Emboss roll: 85 ° C, flat roll: 115-1
It could be performed over a wide range of 55 ° C. The physical properties of the obtained laminated material are such that the adhesive strength in the longitudinal direction is about 1.1 to 2.4 N.
/ 50mm, tensile strength, length: 62-64N / 50m
m, width: 35-36N / 50mm, moisture permeability is 2500
５5000 g / m ² · 24 hours, water resistance was 20 kPa or more under all conditions. In addition, the evaluation method was performed based on the following.

(1) Adhesive strength 180 ° at a tensile speed of 200 mm / min by a tensile tester.
The adhesive strength was measured by peeling (T-peeling). In addition, sample width: 50 mm, chuck interval: 50 mm, N = 5
Was calculated. (2) Tensile strength Measured according to JIS L 1906. (3) Moisture permeability Measured according to JIS Z 0208 (cup method). (4) Water pressure resistance Measured according to JIS L 1092 (high water pressure method).

Further, the surfaces of the microporous films of the obtained three-layer laminated material were heat-sealed using a heat gradient tester (heat-sealing temperature 180 ° C., seal bar 15 mm × 1).
Heat sealing was performed at 5 mm, a sealing pressure of 40 N, and a sealing time of 1 second. The heat seal strength was 11 N / 15 mm.

Example 2 Using the three-layer laminated material obtained in Example 1, a desiccant (silica gel) of 100 mm × 60 mm was heated at a heat seal temperature of 180 ° C. and 60 shots / day.
Continuous packing was performed in minutes, and a good package having a seal strength of 12 N / 15 mm width was obtained without entrapment of silica gel in the seal portion.

[Comparative Example 1] The microporous film used alone in Example 1, a two-layer laminated material of the microporous film and a polyethylene nonwoven fabric, and a flash-spun nonwoven fabric “TYPEC” [Asahi DuPont Flabondon Products: Co., Ltd.]: A basis weight of 46 g / m ² was used for comparison, but the edge was cut off and the bag could not be made, and the seal bar was soiled.

Example 3 A laminated material for packaging 25 was manufactured using the heat laminating apparatus 2 of the second embodiment. As a laminated sheet 20 of a breathable heat-resistant fiber material 21 and a polyethylene-based resin spun-bonded non-woven fabric 22, "Strumity ME1045 (having a basis weight of 45 g / m ² )" manufactured by Idemitsu Unitech,
As the microporous sheet 23, an inorganic filler-containing stretched polyethylene film “Poram PU35 (thickness: 35 μm)” manufactured by Tokuyama Corporation was used, and as the air permeable material 24, the above-mentioned “Strumity ME1045” manufactured by Idemitsu Unitech was used.

Further, in the multilayer nonwoven fabric of ME1045 (PET spunbond / LLDPE spunbond), LL
The DPE spunbond was fed out so as to come to the bonding surface of the microporous sheet 23 and was subjected to thermal lamination to obtain a laminated material 25 for packaging. The forming conditions were as follows: flat rolls 6 and 16 were used, the roll temperature of flat roll 6 was 140 ° C., the roll temperature of flat roll 16 was 115 ° C., and the processing speed was 25 m /
min, and a linear pressure of 25 kg / cm.

Example 4 Polyolefin-based flat yarn biaxial heat-sealing type laminated nonwoven fabric “Sof HM55 (32 g / m ² )” manufactured by Sekisui Chemical Co., Ltd.
The conditions were the same as in Example 3, except for using. further,
Various evaluations were performed on Examples 3 and 4. The evaluation method is as follows, and the evaluation results are as shown in Table 1.

[Evaluation method] (1) Tensile strength: conforms to JIS L 1906 (2) Moisture permeability: conforms to JIS Z 0208 cup method (3) Water pressure resistance: conforms to JIS L 1092 high water pressure method (4) Air permeability: JIS (10) Seal strength 1) Seal structure: The evaluation sample was sealed with a dry laminated film (ONy 15 μm / LL50 μm). (Where O
NY is an abbreviation for stretched nylon, and LL is LL
Abbreviation for DPE (linear low density polyethylene). 2) Heat seal with LL surface of dry laminate product. 3) Measure MD and TD directions. (Here, the MD direction is the moving direction of the film, and the TD direction is the MD direction.
The vertical direction. ) Measurement conditions: Heat sealing using a thermal gradient tester, pressure 4 kgf, time 1 sec, seal strength measured using a tensile tester at a pulling speed of 200 m / min.

[0076]

[Table 1]

By laminating the air-permeable material by another heat lamination, the sealing strength could be improved without deteriorating the moisture permeability, water pressure resistance and air permeability.

[0078]

Industrial Applicability The laminated material for packaging according to the present invention has air permeability, moisture permeability and barrier property against fine powder, has excellent sealing properties, and is suitable for packaging various functional articles such as an oxygen scavenger and a moisture absorbent. Further, since no adhesive is used for lamination, the manufacturing process is easy, and there is no decrease in air permeability, moisture permeability, odor, etc., and it can be applied to packaging of a wide range of functional articles. Therefore, there is no problem of food contamination due to leakage of a functional article used in the food field requiring a reliable sealing property, and safety is ensured.

[Brief description of the drawings]

FIG. 1 is a view showing a heat laminating apparatus according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the packaging laminate material in the embodiment of FIG.

FIG. 3 is a view showing a heat laminating apparatus according to a second embodiment of the present invention.

FIG. 4 is a cross-sectional view of the laminated packaging material in the embodiment of FIG.

[Explanation of symbols]

 1, 2 Heat laminating device 4, 5, 9 Supply roll 6, 16 Flat roll 7 Emboss roll 8 Winding roll 10, 20 Laminated sheet 11, 21 Air-permeable heat-resistant fiber material 12, 22 Polyethylene resin spunbond nonwoven fabric 13, 23 Microporous sheet 14, 25 Laminated material for packaging 24 Breathable material

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E067 AA11 AB96 AB97 BA18A BB06A BB14A BB15A BB16A BB25A CA03 CA07 CA10 EA06 FA01 FC01 3E068 AA22 AB05 AB10 AC09 CC22 CD01 CE01 CE05 CE10 EE15 EE21 EE36 3E041 BA29 BA01 BA01 AK04B AK04C AK62B AR00A AR00C BA03 BA07 BA10A BA10C DG01A DG15A DG15B DJ00C GB15 JA04A JA13B JD02A JD04 JJ03A JK02 JK06 YY00A

Claims (11)

[Claims] 1. A packaging laminated material comprising a breathable heat-resistant fiber material layer having a heat resistance of 150 ° C. or higher, a polyethylene-based resin spunbond nonwoven fabric layer, and a microporous film laminated in this order by thermal bonding. 2. The air-permeable heat-resistant fiber material layer has a thickness of 150 to 300.
The packaging laminate material according to claim 1, comprising a resin spunbonded nonwoven fabric having a melting point of ° C. 3. A polyethylene resin having a density of 880-9.
The packaging laminate material according to claim 1 or 2, which is an ethylene-α-olefin copolymer having a weight of 50 kg / m ³ . 4. A laminate material for packaging wherein a gas-permeable heat-resistant fiber material layer having a heat resistance of 150 ° C. or more, a polyethylene-based resin spun-bonded nonwoven fabric layer, a microporous film and a gas-permeable material are laminated in this order by thermal bonding. 5. The air-permeable heat-resistant fiber material layer has a thickness of 150 to 300.
The packaging laminate material according to claim 4, comprising a resin spunbonded nonwoven fabric having a melting point of ° C. 6. A polyethylene resin having a density of 880-9.
The packaging laminate material according to claim 4 or 5, which is an ethylene-α-olefin copolymer having a weight of 50 kg / m ³ . 7. The air-permeable material is a non-woven fabric.
7. The laminated material for packaging according to 6. 8. The nonwoven fabric is a spunbond nonwoven fabric or
The packaging laminate material according to claim 7, which is a split fiber nonwoven fabric. 9. The packaging laminate material according to claim 1, wherein the microporous film is a polyethylene resin. 10. A package using the packaging laminate material according to claim 1. 11. A package of an oxygen absorber, a desiccant, a moisture absorbent, a deodorant, a heating agent, an insect repellent, a dehumidifier or a fragrance, using the laminated material for packaging according to any one of claims 1 to 9. .