TW201607755A - Easy-cut absorbent laminate, and packaging bag using same - Google Patents

Abstract

The purpose of the present invention is to provide an absorbent laminate which has high absorbency and which can be cut easily. This absorbent laminate comprises the following layers, in the following order: a heat-sealing inner skin layer which contains a thermoplastic resin and more than 10.2 vol% and less than or equal to 60.0 vol% of an inorganic absorbent; an intermediate layer which contains a thermoplastic resin and more than 10.2 vol% and less than or equal to 70.0 vol% of an inorganic absorbent; an outer skin layer which contains a thermoplastic resin; and a barrier layer.

Description

Easy-to-cut absorbent laminate and packaging bag using the same

The present invention relates to an absorbent laminate which can be easily torn and a packaging bag using the same.

In recent years, an absorbent laminate system used for absorption of moisture, gas, or the like has been used as an inner layer of a packaging bag. This packaging bag is very useful because it does not require an absorbent package such as a silicone gel package to be enclosed inside. Such an absorbent laminate system is disclosed, for example, in Patent Documents 1 to 4.

Patent Document 1 discloses a packaging container formed of a laminate including an outer layer composed of a polyethylene terephthalate film, a gas barrier layer composed of an aluminum foil, or the like, and a polyolefin-based layer. A moisture absorbing layer of a resin and a hygroscopic inorganic compound, and a gas barrier layer composed of a polyolefin resin.

Patent Document 1 uses a moisture-absorbing inorganic compound in which calcium oxide is used as a moisture absorbing layer, which absorbs water and becomes calcium hydroxide. When the calcium hydroxide produced in this manner reacts with carbonic acid gas, calcium carbonate is formed and water is again formed. Therefore, by using a gas barrier layer, the calcium hydroxide generated by the absorption of water is prevented from coming into contact with the carbonic acid gas to prevent the water from re-using. generate. Here, in order to absorb the water regenerated in the moisture absorbing layer, and/or to pass moisture to the moisture absorbing layer, the gas barrier layer may further contain a hygroscopic inorganic compound such as zeolite or calcium chloride. There is no discussion on the amount of blending thereof, and specific examples of actual blending have not been disclosed.

Patent Document 2 discloses a packaging container formed of an absorbent laminate comprising a base material layer composed of a polyethylene terephthalate film or the like, and a gas composed of an aluminum foil or the like. A barrier layer and an absorbing layer (desiccant film). Here, the absorbing layer (drying agent film) has an intermediate layer (drying agent film layer) composed of a resin containing a desiccant, and is composed of two linear low-density polyethylenes sandwiched on both sides thereof. The three-layer structure of the skin layer (reinforcing layer).

Patent Document 3 discloses a packaging container formed of an absorbent laminate comprising, in order, a polyethylene terephthalate film, an aluminum foil, an absorbent layer (drying film), and polypropylene. Nitrile film. Here, the absorbing layer (drying agent film) has three layers of an intermediate layer (drying agent film layer) composed of a resin containing a desiccant, which is sandwiched by a skin layer composed of a resin containing a desiccant. structure.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2004-210392

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2005-280188

[Patent Document 3] Japanese Patent Laid-Open Publication No. 2006-346888

The packaging bags as disclosed in Patent Documents 1 to 3 are produced by laminating heat-sealing packaging materials and heat-sealing the peripheral edges. At this time, the user can tear and open the slit by forming a slit or the like due to the peripheral heat seal portion. However, in Patent Documents 1 to 3, the ease of tearing (easeability of cutting) of the absorbent laminate and the packaging bag using the same is not considered.

In fact, the gas barrier layer composed of low-density polyethylene of Patent Document 1 and the two skin layers composed of linear low-density polyethylene of Patent Document 2 are layers which are highly viscoelastic and are not easily torn. It is impossible to tear the bag to open it.

Further, the polyacrylonitrile layer of Patent Document 3 is a film which is generally easy to tear, but in the case of the structure of Patent Document 3, it is necessary to have a large force for tearing. Even if it is barely opened, the packaging material will be stretched, and the aesthetics of the tearing section will be deteriorated.

Further, in Patent Document 1 and Patent Document 3, since the absorbent layer containing the moisture absorbent is laminated with the gas barrier layer such as aluminum foil, a so-called laminate float of the interface is locally peeled off. .

In addition, the package can be subjected to easy cutting processing such as laser treatment or porous treatment to impart easy cutting property. However, in this case, the number of processing engineering increases.

Accordingly, an object of the present invention is to provide an absorbent laminate which can be easily produced, has high absorbency, and is easily peeled off aesthetically. And use the bag. Further, the object of the invention is to provide an absorbent laminate which is less likely to be stacked and floated between the barrier layer and the absorbent layer, and a packaging bag using the same.

The inventors have found that the above problems can be solved by the following means.

<1> An absorbent laminate comprising, in this order, a layer comprising more than 10.2% by volume and 60.0% by volume or less of an inorganic absorbent, and a heat-sealable inner skin layer of a thermoplastic resin; comprising more than 10.2 by volume %, 70.0% by volume or less of an inorganic absorbent, and an intermediate layer of a thermoplastic resin; an outer skin layer comprising a thermoplastic resin; and a barrier layer.

<2> The laminate according to the above <1>, wherein the tear strength is at least 5.0 N/mm in at least one direction.

<3> The laminate according to the above <1> or <2>, wherein the heat-sealing strength is obtained by folding and heat-sealing the inner skin layers at a temperature of 160 ° C and a pressure of 0.10 MPa for one second. 6.0N/15mm or more.

The laminate according to any one of the above aspects, wherein the inorganic absorbent in the outer layer is 10.0% by volume or less.

The layered body of any one of the above-mentioned <1> to <4>, wherein the content of the inorganic absorbent of the inner layer is 16.6 vol% or more and 35.3 vol%. the following.

The layered body of any one of the above-mentioned intermediate layers, wherein the volume ratio of the inorganic absorbent of the intermediate layer is higher than the volume content of the inorganic absorbent of the inner layer.

The layered body of any one of the above-mentioned <1> to <6> wherein the inorganic layer of the intermediate layer and the inner layer is composed of zeolite, aluminum oxide, aluminum oxide, magnesium niobate, and ruthenium. Glue, calcium oxide, calcium chloride, calcium sulfate, magnesium sulfate, sodium sulfate, calcium carbonate, magnesium oxide, barium oxide, phosphorus pentoxide, magnesium perchlorate, potassium permanganate, sodium permanganate, thiosulfuric acid Sodium, iron powder, ferrous oxide, ferrous salt, sodium chloride, sodium bromide, sodium iodide, potassium chloride, potassium bromide, potassium iodide, calcium chloride, magnesium chloride, barium chloride, anoxic yttrium oxide, The sulfite, bisulfite, dithionite, and mixtures thereof are each independently selected.

The laminate of any one of the above-mentioned <1> to <7>, wherein the barrier layer is made of an aluminum foil, an aluminum alloy foil, a polyethylene terephthalate film, or a polyvinylidene chloride film. , polyacrylonitrile film, ethylene-vinyl alcohol copolymer film, polyamide film, aluminum vapor-deposited polyester film, aluminum vapor-deposited polypropylene film, cerium oxide/aluminum oxide vapor-deposited polyester film, cerium oxide/aluminum A film selected from the group consisting of an oxygen vapor-deposited polyimide film, a polyvinylidene chloride-coated polypropylene film, and two or more layers of these laminated films.

<9> The laminate according to any one of the above <1> to <8> which has a thickness of 60 to 200 μm.

<10> A packaging bag according to any one of the above <1> to <9> or the plurality of laminates, wherein the inner skin layers are heat-sealed to each other, or The inner skin layer is formed by heat sealing with another film.

According to the absorbent laminate of the present invention, it is possible to provide a packaging bag which can be easily produced, has high absorbency, and is easily torn. Further, even in the case where the absorbent laminate of the present invention is torn by hand, the resin-free film is stretched or wobbled on the cut surface thereof, and the absorbent laminate can be more beautifully torn.

1‧‧‧absorbing layer

11‧‧‧ inner layer

12‧‧‧Intermediate

13‧‧‧ outer skin layer

2‧‧‧Barrier

21‧‧‧Aluminum foil layer

22‧‧‧PET layer

100‧‧‧Easy-cutting absorbent laminate

[Fig. 1] is a schematic view showing a laminated structure of a laminated body according to one embodiment of the present invention.

<Absorbing laminate>

The easy-to-cut absorbent laminate system of the present invention comprises a heat-sealable inner skin layer, an intermediate layer, an outer skin layer, and a barrier layer, the inner skin layer comprising more than 10.2% by volume and less than 60.0% by volume of the inorganic absorbent. And a thermoplastic resin; the intermediate layer comprises more than 10.2% by volume and 70.0% by volume or less of an inorganic absorbent and a thermoplastic resin; and the outer skin layer comprises a thermoplastic resin. In the present specification, the inner skin layer, the intermediate layer, and the outer skin layer are referred to as absorbent layers.

The laminated system of the present invention preferably has a tear strength of less than 5.0 N/mm in one of the directions. For example, in the laminated system of the present invention, one of the flow direction (MD) and the width direction (TD) in the formation of the laminate is preferably in the two directions, and the tear strength is less than 5.0 N/mm.

The thickness of the laminate of the present invention can be, for example, 250 μm or less, 200 μm or less, 150 μm or less, or 100 μm or less, and can be 50 μm or more, 60 μm or more, or 70 μm or more.

Fig. 1 is a view showing a laminated structure of a laminate (100) relating to one embodiment of the present invention. The laminated body (100) is formed by laminating a barrier layer (2) on the absorbing layer (1) composed of the inner skin layer (11), the intermediate layer (12), and the outer skin layer (13), and the barrier layer (2) It comprises an aluminum foil layer (21) and a polyethylene terephthalate layer (22).

(absorber layer)

The absorbing layer comprises: an inner skin layer, an intermediate layer, and an outer skin layer, the inner skin layer comprising an inorganic absorbent and a thermoplastic resin; the intermediate layer comprising an inorganic absorbent and a thermoplastic resin; the outer skin layer comprising a thermoplastic resin . Preferably, the intermediate layer contains more inorganic absorbent than the inner skin layer, and imparts high absorbency to the laminate. Next, the heat-seal inner layer is laminated on the intermediate layer having a low heat sealability due to the presence of a large amount of the absorbent, thereby imparting high heat sealability to the laminate. However, the content of the absorbent in the intermediate layer may be set to be lower than the content of the inner layer.

These layers include a thermoplastic resin, and examples of the resin include a polyolefin resin, and in particular, low density polyethylene (LDPE), linear low density polyethylene (LLDPE), medium density polyethylene (MDPE), high density polyethylene (HDPE), polyethylene polymerized using a metallocene catalyst, propylene homopolymer, propylene - Ethylene block copolymer, propylene-ethylene random copolymer, polypropylene polymerized using metallocene catalyst, chlorinated polypropylene, polymethylpentene, ethylene-acrylic acid copolymer (EEA), ethylene-methyl Acrylic copolymer (EMAA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methacrylate copolymer (EMA), ethylene-ethyl acrylate copolymer, ethylene-vinyl acetate copolymer (EVA) , ionic polymer, carboxylic acid modified polyethylene, carboxylic acid modified polypropylene, carboxylic acid modified ethylene-vinyl acetate copolymer, and further, may also be mentioned: saturated polyester, polyvinyl chloride, polystyrene, polycarbonate, Polyamide, and mixtures of these.

Examples of the absorption target of the absorption layer include water, organic and inorganic gases such as carbon dioxide, ammonia, hydrogen sulfide, oxygen, chlorine, and hydrogen chloride.

Examples of the inorganic absorbent contained in the inner skin layer and the intermediate layer include calcium oxide, calcium chloride, calcium sulfate, magnesium sulfate, sodium sulfate, calcium carbonate, magnesium oxide, barium oxide, phosphorus pentoxide, and perchloric acid. A chemical adsorbent such as magnesium acid, potassium permanganate, sodium permanganate or sodium thiosulfate, and a physical adsorbent such as aluminum oxide, aluminum oxide, magnesium citrate, quicklime, strontium gel, inorganic molecular sieve or the like. The example of the inorganic molecular sieve is not limited, and examples thereof include an open structure in which small molecules such as aluminosilicate mineral, clay, porous glass, microporous activated carbon, zeolite, activated carbon, or water are diffused. Compound.

Further, as the inorganic absorbent, iron powder (for example, Iron-based oxygen absorbers such as reduced iron powder, spray iron powder, active iron powder, etc., ferrous oxide, ferrous salts, etc., halogenated metals (for example, sodium chloride, sodium bromide, sodium iodide, potassium chloride) , potassium bromide, potassium iodide, calcium chloride, magnesium chloride, barium chloride, etc.), anoxic bismuth oxide, sulfite, bisulfite, dithionite and other oxygen scavengers.

The average particle diameter of the inorganic absorbent (particle diameter when the integrated value in the particle size distribution obtained by the laser diffraction/scattering method is 50%) is not particularly limited, but may be, for example, a volume average particle diameter of 100 nm. The above, 500 nm or more, 1 μm or more, or 5 μm or more may be 100 μm or less, 50 μm or less, 30 μm or less, or 15 μm or less. In the present invention, the above-mentioned inorganic absorbent can be suitably used in combination with the purpose of the absorption, the nature of the contents, the surface roughness of the inner layer, the absorption speed of the object, and the like.

The absorbent layer can be produced by a multilayer inflation method. It is a method of producing a multilayer film by extruding a plurality of resins into a tubular shape by a plurality of extruders, and sending air therein to expand.

The intermediate layer of the absorbing layer may also be formed into a film or a sheet by an inflation method, a T-die method, a calendering method, a casting method, a press molding, an extrusion molding or an injection molding, and the outer layer and/or the inner layer may be formed. Each of the skin layers was thinned by a known method, and then an intermediate layer was laminated and laminated to produce an absorbent layer.

Before the intermediate layer is produced by the inflation method, it is preferred to heat and knead the thermoplastic resin and the inorganic absorbent by a biaxial kneading machine, and then process it into a tablet shape, thereby preparing a resin for the intermediate layer and the inner layer. group Adult (ingot). Further, the ingot may be dry blended with the ingot of the thermoplastic resin to adjust the content of the inorganic absorbent by dilution. Next, an ingot of the intermediate layer and the inner layer and an ingot of the thermoplastic resin for the outer layer are used to form a multi-layer film by an inflation method, thereby producing an absorbent layer. After the intermediate layer is produced by the inflation method, the film which is separately produced as the inner and outer skin layers may be laminated by hot pressing or the like to obtain an absorption layer.

In the case where the absorption layer is produced by the T-die method, a masterbatch may be prepared beforehand, and a film of the intermediate layer and the skin layer may be formed. In this case, the skin layer may be co-extruded on both sides or one side of the intermediate layer, or the film to be the skin layer may be laminated by heat pressing or the like to obtain an absorbent layer.

The thickness of the absorption layer is, for example, 200 μm or less, 180 μm or less, 150 μm or less, or 100 μm or less, and further 30 μm or more, 40 μm or more, and 50 μm or more.

(absorbent layer - inner layer)

The inner skin layer is located at the outermost layer (the innermost layer of the packaging bag) of the easily smearable absorbent laminate of the present invention, and imparts heat sealability to the laminate of the present invention. By including the inorganic absorbent in the inner skin layer, the easy-cutting property and the saturated absorption amount of the absorbent laminate can be improved. When the absorbent laminate is used in the packaging bag, the present inventors have found that the inner layer as the innermost layer contains an inorganic absorbent and is easy to cut, thereby making the entire absorbent laminate easy to cut.

The reason why the inner layer of the innermost layer contains an inorganic absorbent and the entire absorbent laminate is easy to cut is considered to be the following mechanism. That is, it is presumed that the film of the thermoplastic resin having strong viscoelasticity is not easily torn due to the bonding, and on the other hand, the resin film mixed with the absorbent is made by dispersing the particulate absorbent to form a bonding ratio thermoplastic resin. The elemental film is more moderate, and the physical strength against stresses such as tearing, tensile, and stab is weakened. Further, it is presumed that the surface of the inner skin layer is thickened by the absorption of the absorbent in the inner skin layer, and a torsional stress is applied to the unevenness of the roughened surface, whereby the crack easily enters and the crack propagates well. .

The inner skin layer may contain a large amount of inorganic absorbent as long as it has heat sealability, and may be more than 10.2% by volume, 11.0% by volume or more, 15.0% by volume or more, 16.6% by volume or more, or 20.0% by volume in the inner skin layer. The inorganic absorbent is contained in the range of 60.0% by volume or less, 50.0% by volume or less, less than 45.6 vol%, 45.0 vol% or less, 40.0 vol. or less, or 35.3 vol% or less. When the content of the inorganic absorbent is increased, the heat sealability tends to be impaired, and the type of the resin, the heat sealing temperature, the layer thickness, and the like must be appropriately selected. If it exceeds 60% by volume, it becomes difficult to impart heat sealability.

Further, in the case where the volume % of the inorganic absorbent contained in the layer is calculated, when the specific gravity of the inorganic absorbent is unclear, it can be determined by measuring the specific gravity of the layer, and based on the measured value, The weight of the inorganic absorbent and the thermoplastic resin added, and the specific gravity of the thermoplastic resin were determined. For example, in the case where the specific gravity of the layer formed by using 50 g of the inorganic absorbent and 50 g of the thermoplastic resin having a specific gravity of 0.90 g/cm ³ is 1.10 g/cm ³ , the inorganic absorbent contained in the layer can calculate the specific gravity. It was 1.41 g/cm ³ , and it can be said that the inorganic absorbent was 38.9 % by volume in this layer.

The resin used for the inner skin layer is preferably selected from among the above resins, particularly crystalline resins, in order to impart heat sealability.

The inner skin layer is heat-sealed to the inner skin layers, and when the inner skin layers are heat-sealed at a temperature of 160 ° C and a pressure of 0.10 MPa for one second, it is preferably 6.0 N/15 mm or more and 8.0. N/15 mm or more, 10.0 N/15 mm or more, 15.0 N/15 mm or more, or 20.0 N/15 mm or more. Further, according to JIS Z0238, the appropriate strength of the general packaging material is light-small size-common strength is 6N/15 mm or more, and weight-large size-strong strength is 15 N/15 mm or more.

The thickness of the inner skin layer is, for example, 30 μm or less, 20 μm or less, or 15 μm or less, and further 5 μm or more, or 8 μm or more.

(absorber layer - middle layer)

The intermediate layer may be set to have a content of the inorganic absorbent of the inner skin layer or less, but is preferably a content of the inorganic absorbent of the inner skin layer or more. The intermediate layer may be more than 10.2% by volume, 11.0% by volume or more, 15.0% by volume or more, or 20.0% by volume or more from the viewpoint of the absorption amount, the easy-cut property, and the film-forming stability of the absorbed material, and The inorganic absorbent is contained in the range of 70.0% by volume or less, 60% by volume or less, or 50% by volume or less.

The thickness of the intermediate layer is, for example, 10 μm or more, 20 μm or more, or 30 μm or more, 150 μm or less, 100 μm or less, or 80 μm or less.

(absorbent layer - outer layer)

In the outer skin layer, it is preferred that the inorganic absorbent is not contained in view of the adhesion of the barrier layer. If the outer skin layer contains a large amount of inorganic absorbent, the surface of the outer skin layer becomes thick, and a so-called laminate floating of the barrier layer and the outer skin layer is likely to occur, so that even if the outer skin layer contains an inorganic absorbent In this case, it is preferably 10.0% by volume, 7.0% by volume, 5.0% by volume, 3.0% by volume, or 1.0% by volume or less in the layer. When the content is 10.0% by volume or less, since the surface of the outer skin layer does not become too thick, lamination does not occur between the barrier layer and the effect is particularly high at 7.0% by volume or less.

The thickness of the outer skin layer is, for example, 20 μm or less, or 15 μm or less, or 5 μm or more, or 8 μm or more.

The present inventors have found that even if the outer skin layer contains almost no inorganic absorbent, it is usually made of a resin having high viscoelasticity and which cannot be easily torn, for example, a low-density polyethylene, and is easy for the absorbent laminate as a whole. Cutting properties will not have a major impact. This reason is presumed to be due to the fact that the outer skin layer is thin and the structure is not adhered by the layer adjacent to the outer skin layer, so that even if the outer skin layer is low-density polyethylene or the like, Rip apart with the upper and lower layers.

(barrier layer)

The barrier layer is a layer that separates the absorber layer from the external environment. In the case of using the laminate of the present invention to make a package, the barrier layer is located outside the bag. The barrier layer preferably imparts appropriate toughness, strength, and the like in addition to the barrier property of the laminate of the present invention. Further, in order to impart easy cutability to the laminate of the present invention, it is preferable that the barrier layer is also easy to cut. However, at least one of the barrier layers may be non-cuttable.

Examples of such a barrier layer include a metal foil, a resin film (for example, an extended resin film), and the like, and particularly, an aluminum (Al) foil, an aluminum alloy foil, and polyethylene terephthalate. Diester (PET) film, polyvinylidene chloride (PVDC) film, polyacrylonitrile (PAN) film, ethylene-ethylene acrylate copolymer (PVA) film, polyamine (for example, Nylon (registered trademark), A film selected from the group consisting of a film of Nylon 6, Nylon MXD6, and a laminated film of two or more of these. For example, the barrier layer may be a laminated film of a PET film and an Al foil. In this case, the PET film is set to the outermost layer, and the Al foil is placed on the side of the absorption layer.

Alternatively, the thermoplastic resin film may be used alone or in combination with the above-mentioned film, and the thermoplastic resin film may have at least a metal, a metalloid or an oxide layer or a halogenated polymer layer of such an oxide. Specifically, examples of the vapor deposition layer of the metal, the metalloid or the oxides thereof include an aluminum vapor deposition film, a cerium oxide vapor deposition film, an aluminum oxide vapor deposition film, a ceria/aluminum oxide binary vapor deposition film, and the like. Examples of the halogenated polymer layer include a polyvinylidene chloride coated film and a polyvinylidene fluoride coated film. Examples of the resin film which is deposited in this manner include polyolefin resins (especially Stretched or unstretched polypropylene), polyvinyl chloride, saturated polyester (for example, polyethylene terephthalate (PET), polybutylene terephthalate), polydecylamine (for example, Nylon (registered Trademark), Nylon 6, Nylon MXD6).

In the case where the barrier layer contains a thermoplastic resin film, the film is preferably a stretched film from the viewpoint of easy cutting property. However, even in the case of a non-stretched film, in the case where the thickness is thin and the film which is easy to cut is used for lamination, it is preferable to sufficiently maintain the easy-cut property.

In the case where the barrier layer is a laminated film, a known lamination method such as dry lamination, sandwich laminate, extrusion lamination, or hot melt method can be used as the lamination method.

The thickness of the barrier layer can be, for example, 200 μm or less, 150 μm or less, or 100 μm or less, and can be 20 μm or more, from the viewpoint of imparting easy cutting property and barrier property to the overall strength of the laminated body of the present invention. 30 μm or more, or 50 μm or more.

For example, when the barrier layer is formed of a laminate of a resin film (for example, an extended resin film) and a metal foil, the thickness of the resin film can be, for example, 8 μm or more, 10 μm or more, or 15 μm or more, and can be set to 100 μm or less, 50 μm or less, or 30 μm or less. Further, the thickness of the metal foil can be, for example, 6 μm or more, 9 μm or more, or 12 μm or more, and can be 100 μm or less, 80 μm or less, or 50 μm or less. In the case where the resin film is not easy to cut, the thickness of the resin film is preferably smaller.

As a method of laminating the barrier layer and the absorber layer, Lift: dry lamination and extrusion lamination. The dry lamination method is a method in which one of the films is coated with an adhesive and dried, and then the other film is superposed and pressurized to bond the adhesive to the adhesive. Further, the extrusion lamination is a method in which a polyethylene resin or the like which has been melted and melted between two films is bonded to each other.

(other layers)

The easy-to-cut absorbent laminate system of the present invention may have a reinforcing layer for imparting appropriate toughness, strength, and the like to the laminate, as long as it can maintain the easy-cut property, and to improve the adhesion between the layers. The subsequent layer, undercoat layer, anchor coating, and the like. Further, it may have a printing layer for printing a label or the like, or may have a vapor deposition layer for improving barrier properties.

Further, the easily smearable absorbent laminate system of the present invention may have a thin coating layer on the outer side of the barrier layer. For example, examples of such a coating layer include an anti-caking layer, an anti-UV coating layer, a water/moisture-proof coating layer, a slip coating layer, a non-slip coating layer, a gloss layer, and a matte coating. a cloth layer, an antistatic coating layer, and the like.

<Easy cutting bag>

The above-described absorbent laminate can be used to form the package of the present invention. In this case, the packaging bag may be formed by heat-sealing the above-mentioned absorbent laminates, or by heat-sealing the heat-sealable barrier film or laminated film with the above-mentioned absorbent laminate. Forming is also possible.

This packaging bag can be used for sealing medicines, medical components, in vitro diagnostic reagents, medical equipment, sanitary products, precision machines, electronic devices, cosmetics, foods, and the like.

[Examples] <<Production of absorbent laminate>> <Comparative Examples 1 to 6 and Layers of Examples 7 to 16>

The laminates of Comparative Examples 1 to 6 and Examples 7 to 16 described in Tables 1 and 2 were produced in the following manner.

(intermediate layer ingot)

First, a biaxial extruder (using a zeolite as an inorganic absorbent (UNION SHO WA Co., Ltd., zeolite 3A) and an ingot of EMAA (Dupont-Mitsui Polychemicals Co., Ltd., Nucrel AN42115C) as a thermoplastic resin are used. Kiba Co., Ltd., PCM 70), kneading/re-pelleting, and obtaining an ingot for an intermediate layer having a zeolite content of 53% by weight (46.6% by volume).

(inner skin layer ingot)

The ingots of the above-mentioned ingots and LLDPE (EVOLUE SP2520, manufactured by Prime Polymer Co., Ltd.) were mixed by dry blending to obtain Comparative Examples 1 to 6 and Examples 7 to 14 in which the zeolite content was low. Various ingots for the inner skin layer. In addition, for Examples 15 to 16, it is within the formation. In the case of the skin layer, an ingot for an intermediate layer having a zeolite content of 53% by weight was used.

(inner layer for ingot)

An ingot of LLDPE (made by Prime Polymer Co., Ltd., EVOLUE SP2520) was prepared as an ingot layer for the outer skin layer.

(formation of the absorption layer)

The absorbent layers used in Comparative Examples 1 to 6 and Examples 7 to 16 were obtained from the ingots of the respective layers described above by an inflation molding method (TUL-600R, manufactured by Placo Co., Ltd.) using an inflation molding machine (Pluco Co., Ltd., TUL-600R).

(laminate of barrier layers)

For the absorbing layer of this type, a 12 μm PET film (E5100, manufactured by Toyobo Co., Ltd.) and a 9 μm aluminum foil (BESPA manufactured by UACJ Co., Ltd., BESPA) were dry laminated (manufactured by Techno Smart Co., Ltd., INVEX). Guide the coater) to laminate. In this manner, a laminate of a layer structure of a PET film//aluminum foil//absorbing layer was obtained.

<Laminate of Comparative Example 17>

As described in Table 3, the absorbent layer of the laminate of Comparative Example 17 was changed to 60 μm of the intermediate layer of the absorbent layer of Comparative Example 1, and was produced under the same conditions. On the other hand, a 12 μm PET film (E5100, manufactured by Toyobo Co., Ltd.) and a 9 μm aluminum foil (a foil made of UACJ Co., Ltd.), which are easy to cut, are provided by a porous process. Between the BESPAs, LDPE (Suntec L1850K, manufactured by Asahi Kasei Chemicals Co., Ltd.) was extruded at 15 μm and sandwiched to obtain an absorbent laminate.

<Layer of Comparative Example 18>

As described in Table 3, the absorbent layer of the laminate of Comparative Example 18 was changed to 60 μm of the intermediate layer of the absorbent layer of Comparative Example 1, and was produced under the same conditions. On the other hand, a 12 μm PET film (EMBLET PC, manufactured by Unitika Co., Ltd.) and a 9 μm aluminum foil (BESPA manufactured by UACJ Co., Ltd., BESPA) were dry-laminated to obtain an absorbent laminate. body.

<Laminate of Comparative Example 19>

A laminate film of Comparative Example 19 was obtained in the same manner as in Comparative Example 1, except that a 40 μm LLDPE (L-185, manufactured by Aicello Co., Ltd.) was used instead of the absorbing layer.

<Thin film of Comparative Example 20>

As the film of Comparative Example 20, a film of non-stretched polypropylene (CPP) (SUPERITY® Co., Ltd., SUPERFOIL E0020NA) was used.

<Laminate of Comparative Example 21>

On the inner skin layer side of the laminate of Comparative Example 1 and Comparative Example 15, a PAN film having a thickness of 30 μm was further laminated by dry lamination. (Hitron BX, manufactured by TAMAPOLY Co., Ltd.), the laminate of Comparative Example 21 was obtained.

<<Evaluation method>> <Easy cutting - tear strength>

The tear strength was measured in accordance with the pants-shaped tearing method in accordance with JIS K7128-1. Here, the Strograph VES1D manufactured by Toyo Seiki Co., Ltd. was used, with a sample size of 115 mm × 50 mm and a slit of 45 mm in the longitudinal direction, a test speed of 200 mm/min, a distance between the clamps of 75 mm, and a measurement distance of 150 mm, so that the inner layer was oriented. The measurement was performed from the top, and the average value of the measured values was used three times. The measured value at this time is obtained by reading the interval average load N and cutting it by the thickness of the sample.

<Easy cutting - appearance of tearing section>

It is confirmed whether or not the laminate is cut into pieces and is torn by hand. Further, on the cross section after the tearing, it was visually observed whether or not the resin film was not stretched and shaken. The case where the stretching and the shaking were performed was ×, and the case where only the shaking was caused was Δ, and the case where the cross section was neat was taken as ○.

<Easy cutting - judgment>

When the tear strength is less than 5.0 (N/mm) and there is no extension or shaking on the tear section, the judgment of the easy-cutting property is ○, and the tear strength is 5.0 (N/mm) or more. If it is less than 6.0 (N/mm) and there is extension and shaking on the tear section, the judgment of the easy cutting property is taken as △, and the tear is strong. When the degree is 6.0 (N/mm) or more, the judgment of the easy-cutting property is taken as ×. In addition, in the present specification, the case of "easy-cutting property" is the property of the laminated body of △ or ○ in this determination.

<Heat sealability - heat seal strength>

The heat seal strength was measured in accordance with JIS Z0238. Here, the Strograph VE10D manufactured by Toyo Seiki Seisakusho Co., Ltd. was used to measure the sample size of 15 mm in width and 100 mm in length, and the relative moving speed between the jigs was 300 mm/min, the interval between the jigs was 50 mm, and the MD direction was measured. The average of the measured values of 3 times was used.

<Heat sealability-judgment>

After the inner skin layers are heat-sealed at a temperature of 140 ° C to 170 ° C and a pressure of 0.10 MPa for 1 second, the heat seal strength is 15.0 N/15 mm or more under at least a part of the temperature conditions. ○, when it is less than 15.0 N/15 mm under all temperature conditions, but it is 6.0 N/15 mm or more under some temperature conditions, the heat sealability is taken as Δ, and under all temperature conditions. When the ratio is less than 6.0 N/15 mm, the heat sealability is taken as ×.

<saturated absorption amount>

In order to confirm the absorption capacity of the water of the absorbent laminate, the saturated absorption amount was evaluated in the following manner. First, a non-woven fabric after water immersion is placed on a bottle and placed in an oven at 60 ° C to prepare an environment of high temperature and humidity. Connect A 10 cm square sample in which the weight before moisture absorption was previously measured was placed in a bottle and stored in an oven at 60 ° C for 14 hours. After storage, the sample was taken out, the moisture on the surface was wiped off, and the mixture was allowed to stand in an environment of a temperature of 23 ° C and a relative humidity of 50% for 3 hours, and the weight after moisture absorption was measured. The saturated absorption amount was converted from the change in weight before and after moisture absorption.

<<Results>>

About Comparative Examples 1 to 6, Examples 7 to 16, and Comparative Examples 17 to 21 were tested for easy cutability, heat sealability, and saturated moisture absorption. The results are shown in Tables 1 to 3 below.

[Table 1]

[Table 2]

[table 3]

It can be seen that the laminate system of Comparative Examples 1 to 6 has poor cuttability, and when the thickness of the inner layer is increased, the cutability tends to be deteriorated. On the other hand, it is understood that in Examples 7 to 16, the tear strength was low regardless of the thickness of the inner skin layer, and the easy cutability was good.

When compared with Examples 7 to 14, the ease of cutting property was better in Examples 15 to 16, but the heat-sealing property was not high. The reason for this is presumed to be that the inorganic absorbent content of the inner skin layer is high.

In Comparative Examples 17 and 18, since the film imparted with the cuttability or the film having the straight cut property was used in the barrier layer, the ease of cutting of the absorbent laminate was slightly improved. However, it is known that such easy cutability is still insufficient, and therefore, the degree of poor cutability of the inner skin layer is greatly affected.

Although the comparative example 19 is a laminated body used conventionally in a packaging bag, since the complexation of the molecules of LLDPE is strong and the surface is smooth, it is difficult to cause cracking, and it is presumed that the easy-cutting property is extremely poor.

Comparative Example 20 is a non-stretched polypropylene film which is often used for blister packaging or PTP (extruded packaging), and has a high viscoelasticity and a thick film, so that it is easily stretched and is less likely to cause cracking and cannot be torn.

Referring to Comparative Example 21, it was found that even if a PAN film which is usually easy to cut is laminated on a easily smear high-absorbent laminate, the cut-off property is deteriorated. It is important that the inner layer of the layer which is likely to cause cracking is located outside the layered body.

1‧‧‧absorbing layer

11‧‧‧ inner layer

12‧‧‧Intermediate

13‧‧‧ outer skin layer

2‧‧‧Barrier

21‧‧‧Aluminum foil layer

22‧‧‧PET layer

100‧‧‧Easy-cutting absorbent laminate

Claims (10)

An absorbent laminate comprising, in this order, a layer comprising more than 10.2% by volume and less than 6% by volume of an inorganic absorbent, and a heat-sealable inner skin layer of a thermoplastic resin; comprising more than 10.2% by volume, 70.0 5% by volume or less of an inorganic absorbent, and an intermediate layer of a thermoplastic resin; an outer layer comprising a thermoplastic resin; and a barrier layer. The laminate according to claim 1, wherein the tear strength is at least 5.0 N/mm in at least one direction. The laminate according to claim 1 or 2, wherein the heat-sealing strength is 6.0 N/15 mm or more when the inner skin layers are folded and heat-sealed at a temperature of 160 ° C and a pressure of 0.10 MPa for one second. The laminate according to any one of claims 1 to 3, wherein the inorganic absorbent in the outer layer is 10.0% by volume or less. The laminate according to any one of claims 1 to 4, wherein the inner skin layer has an inorganic absorbent content of 16.6 vol% or more and 35.3 vol% or less. The laminate according to any one of claims 1 to 5, wherein a volume content of the inorganic absorbent of the intermediate layer is higher than a volume content of the inorganic absorbent of the inner layer. The laminate according to any one of claims 1 to 6, wherein the inorganic absorbent of the intermediate layer and the inner layer is composed of zeolite, aluminum oxide, aluminum oxide, magnesium niobate, strontium gel, calcium oxide and chlorine. Calcium, calcium sulfate, magnesium sulfate, sulfuric acid Sodium, calcium carbonate, magnesium oxide, cerium oxide, phosphorus pentoxide, magnesium perchlorate, potassium permanganate, sodium permanganate, sodium thiosulfate, iron powder, ferrous oxide, ferrous salt, sodium chloride , sodium bromide, sodium iodide, potassium chloride, potassium bromide, potassium iodide, calcium chloride, magnesium chloride, barium chloride, anoxic yttrium oxide, sulfite, bisulfite, dithionite And each of the groups formed by the mixture of these is independently selected. The laminate according to any one of claims 1 to 7, wherein the barrier layer is made of aluminum foil, aluminum alloy foil, polyethylene terephthalate film, polyvinylidene chloride film, polyacrylonitrile film, Ethylene-vinyl alcohol copolymer film, polyamide film, aluminum vapor-deposited polyester film, aluminum vapor-deposited polypropylene film, cerium oxide/aluminum oxide vapor-deposited polyester film, cerium oxide/aluminum oxide vapor-deposited polyamine A film selected from the group consisting of a film, a polyvinylidene chloride-coated polypropylene film, and a laminate film of two or more of these. The laminate according to any one of claims 1 to 8, which has a thickness of 60 to 200 μm. A packaging bag formed by heat-sealing the inner skin layers of any one of claims 1 to 9 or a plurality of laminated bodies, or heat-sealing the inner skin layer with another film.