JP2004123144A - Humidity-adjustable vessel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a humidity-adjustable vessel which has an internal humidity-adjustable function in a vessel itself, blocks moisture from the outside, selectively absorb the moisture in the vessel, and consistently maintain the properties of moisture-phobic contents for a long time without using a desiccant. <P>SOLUTION: The humidity-adjustable vessel 1 is a sealed vessel comprising a vessel body and a cap. In the vessel body and the cap to constitute the humidity-adjustable vessel, a layer structure of a component wall basically has a multi-layered structure comprising a moisture-permeable resin layer 8 with the desiccant 7 mixed therein, an outer layer on the outer side thereof, and an inner layer 10 on the inner side of the moisture-permeable resin layer 8. A gas-barrier property resin layer 11 is interposed between the moisture-permeable resin layer 8 and the outer layer 9 with adhesive layers 12 and 12 provided on inner and outer surfaces thereof. The moisture-permeable resin layer 8 is formed of a resin with 10.0 g/m<SP>2</SP>24hr or larger steam permeability than a moisture-resistant resin layer constituting the outer layer 9. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a container for an anaerobic tablet, a granular product, a granular product, a dried confectionery, a dried food, etc., wherein the container itself has an internal moisture absorbing property and has a function of blocking external moisture. It relates to a wet container.
[0002]
[Prior art]
Japanese Patent Publication No. 61-34892, Japanese Utility Model Publication No. 2-1177, and Japanese Patent Publication No. 7-94144 disclose a container having a multilayer structure in which a desiccant is mixed in a part of the constituent layers. No. 2,843,558, Japanese Patent Publication No. 7-53222 or Japanese Patent Publication No. 7-96092.
[0003]
As a moisture-proof container for food, the inner layer and the outer layer are formed of high-density polyethylene, and the intermediate layer (hygroscopic layer) is formed of a multilayer film made of a resin mixed with a hygroscopic agent. Has been described.
[0004]
[Problems to be solved by the invention]
By the way, in the container having a multilayer structure described in the above-mentioned utility model registration No. 3063963, since the inner layer is made of high-density polyethylene having low water vapor permeability, the space inside the container is formed by the inner layer having low water vapor permeability. Since it is shielded from the moisture absorbing layer, it has almost no humidity control function inside the container, and therefore, in the case of containers such as humidifier tablets, granules, granules, especially dried confectionery and dried foods, It was necessary to load the desiccant inside the container.
[0005]
However, if a moisture absorbent is loaded into the container, it may be mistaken for the contents, and the contents may be stained due to breakage, which is not preferable. Furthermore, when the inner layer and the outer layer are made of a resin having the same water vapor permeability as the container having the multilayer structure, it absorbs more moisture from the outside of the container having a relatively high humidity, It was found that the function of the hygroscopic resin was reduced, and the moisture in the container was not well absorbed.
[0006]
Therefore, the present invention provides the container itself with its internal humidity control function, shuts off moisture from the outside, and can selectively absorb moisture in the container. It is an object of the present invention to provide a humidity-controllable container capable of stably maintaining the properties of contents for a long period of time.
[0007]
[Means for Solving the Problems]
The present invention provides a humidity-controlling container according to claims 1 to 7 in order to achieve the above object. That is, the humidity-controlling container according to claim 1 is a multilayer container obtained by blow-molding a thermoplastic resin, wherein the multilayer container has at least a moisture-permeable resin layer containing a desiccant and a moisture-resistant resin layer outside the layer. Characterized by a multilayer structure having an outer layer made of
[0008]
The invention according to claim 2 is characterized in that, in the humidity-controlling container according to claim 1, an inner layer made of a moisture-permeable resin is provided inside the moisture-permeable resin layer mixed with the desiccant.
[0009]
The invention according to claim 3 is the container according to claim 1 or 2, wherein the moisture-permeable resin layer is made of a resin having a water vapor permeability higher than that of the moisture-resistant resin layer by 5.0 g / m ² 24 hr or more. Things.
[0010]
The invention according to claim 5 is the moisture-controlling container according to any one of claims 1 to 4, wherein the moisture-permeable resin constituting the moisture-permeable resin layer is a low-density polyethylene, an ultra-low-density polyethylene, a linear low-density polyethylene. Polyethylene, polyolefin resin composed of linear ultra-low density polyethylene, polylactic acid, polyglycolic acid, polyhydroxyalkylates such as polyhydroxybutyrate, polyε-caprolactone, aliphatic polyesters composed of polylactones such as polyvalerolactone Homopolymer and a biodegradable resin comprising a copolymer containing the aliphatic polyester as a main component, and at least one thermoplastic resin selected from the group consisting of ethylene-vinyl acetate copolymer, polyvinyl chloride, and polyamide It is characterized by being.
[0011]
The invention according to claim 6 is the humidity-controlling container according to any one of claims 1 to 5, wherein the moisture-resistant resin constituting the moisture-resistant resin layer is made of high-density polyethylene, polypropylene, or a propylene-ethylene copolymer. It is characterized by the following.
[0012]
According to a seventh aspect of the present invention, in the humidity control container according to any one of the first to sixth aspects, the moisture-permeable resin layer is made of low-density polyethylene and has a powdered chemical formula of MgSO having an average particle size of 50 μm or less as a desiccant. _4. A resin layer mixed with magnesium sulfate represented by nH ₂ O (0 ≦ n ≦ 3), an outer layer is made of a resin layer made of high-density polyethylene, and an inner layer is made of a resin layer made of low-density polyethylene. A regrind layer containing high-density polyethylene is provided outside the resin layer.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 is a longitudinal sectional front view of a humidity control container according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view showing a first example of a layer structure of a constituent wall thereof, and FIG. FIG. 4 is an enlarged sectional view showing the third example.
[0014]
In FIG. 1, 1 is a humidity control container, 2 is its container main body, and 3 is a cap. The container body 2 is sealed by a cap 3, and the humidity control container 1 is a sealed container. In this embodiment, the cap 3 covers the opening 4 of the container body 2, 5 is a fitting concave portion, and 6 is a fitting convex portion. The container body 2 is formed by blow molding a thermoplastic resin.
[0015]
The constituent walls of the container body 2 and the cap 3 constituting the humidity control container 1 have a layer structure shown in FIG. That is, the layer structure is basically a multilayer structure composed of a moisture-permeable resin layer 8 containing a desiccant 7, an outer layer 9 outside the layer, and an inner layer 10 inside the moisture-permeable resin layer 8. A moisture-resistant resin layer 11 is provided between the outer layer 8 and the outer layer 9 by providing adhesive layers 12 and 12 on its inner and outer surfaces. The moisture-permeable resin layer 8 is made of a resin having a water vapor permeability greater than the moisture-resistant resin layer constituting the outer layer 9 by 10.0 g / m ² 24 hr or more. The water vapor permeability was measured by a dry / humidity sensor method at a temperature of 25 ° C. and a relative humidity difference of 90% RH according to JIS K 7129.
[0016]
In the above layer structure, the moisture-permeable resin constituting the moisture-permeable resin layer 8 is a low-density polyethylene, an ultra-low-density polyethylene, a linear low-density polyethylene, a linear ultra-low-density polyethylene, an ethylene-vinyl acetate copolymer, At least one thermoplastic resin selected from the group consisting of polyvinyl chloride and polyamide. The moisture-permeable resin layer 8 contains low-density polyethylene mixed with magnesium sulfate represented by the chemical formula MgSO ₄ .nH ₂ O (where 0 ≦ n ≦ 3) in the form of powder having an average particle size of 50 μm or less as a desiccant. A resin layer is preferred.
[0017]
The outer layer 9 is at least one kind of thermoplastic resin selected from the group consisting of high-density polyethylene, polypropylene, ethylene-propylene copolymer, and polyvinylidene chloride. It is particularly preferable that the outer layer 9 is formed of a resin layer made of high-density polyethylene, and has excellent moisture barrier properties and moldability. The inner layer 10 is formed of a resin layer made of low-density polyethylene, and has excellent water vapor permeability. Here, in general, the density of the low-density polyethylene is 8.910 to 0.925 g / m ³ , and the water vapor permeability is 5 to 10 g / m ² 24 hr.
[0018]
As shown in FIG. 3, the constituent walls of the container body 2 and the cap 3 may have a layer structure in which the inner layer 9 is omitted from the layer structure shown in FIG.
[0019]
As shown in FIG. 4, the constituent walls of the container body 2 and the cap 3 are formed of a moisture-permeable resin layer 8 containing a desiccant 7, an outer layer 9 outside the layer, and an inner layer 10 inside the moisture-permeable resin layer 8. In addition, a recycled resin layer 13 is interposed between the moisture-permeable resin layer 8 and the outer layer 9. The reclaimed resin layer 13 may be a regrind layer containing high-density polyethylene.
[0020]
As the desiccant to be mixed into the moisture-permeable resin layer 8, a desiccant having good dispersibility in a thermoplastic resin is suitable, and it is necessary that the desiccant does not hinder moldability. Next, a desiccant suitable for it will be exemplified.
[0021]
Silica gel, calcium chloride, sodium chloride, magnesium chloride, dibasic sodium phosphate, ammonium chloride, sucrose, potassium carbonate, potassium alum, sodium nitrate, ammonium nitrate, ammonium mononitrate, potassium bromide, quicklime, zeolite, chemical formula MgSO4. , 0 ≦ n ≦ 3), such as magnesium sulfate, aluminum oxide, barium oxide, calcium oxide, and silicon oxide. Among them, magnesium sulfate represented by the chemical formula MgSO4 · nH20 (where 0 ≦ n ≦ 3) has good dispersibility in a thermoplastic resin and excellent moldability and workability. It is suitable as a constituent material.
[0022]
According to the humidity-controlling container 1 according to the present invention, the inner side of the hygroscopic resin layer 8 is the hygroscopic resin layer 8 itself or water vapor regardless of the layer structure shown in FIG. 2, FIG. 3 or FIG. Since the inner layer 10 made of a resin having excellent permeability is provided, the container itself has an excellent humidity control function of the internal space, and the outer layer 9 made of a resin having a high moisture barrier property is provided outside the hygroscopic resin layer 8. Since it is provided, it is possible to block moisture from the outside and selectively absorb moisture in the container. Therefore, the humidity-controlling container 1 according to the present invention can stably maintain the properties of the humid humid contents for a long period of time without using a moisture absorbent or the like.
[0023]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, while providing the container itself with its internal humidity control function, it can block moisture from the outside, can selectively absorb moisture in the container, and can use a humidifier without using a moisture absorbent or the like. It is possible to obtain a humidity-controllable container capable of stably maintaining the properties of the contents for a long period of time.
[Brief description of the drawings]
FIG. 1 is a vertical sectional front view of a humidity control container according to one embodiment of the present invention.
FIG. 2 is an enlarged sectional view showing a layer structure of a constituent wall of the humidity control container shown in FIG. 1 and showing a first example thereof.
FIG. 3 is an enlarged sectional view showing a second example of the layer structure.
FIG. 4 is an enlarged sectional view showing a third example of the layer structure.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Humidity control container 2 Container main body 3 Cap 4 Opening 5 Fitting concave part 6 Fitting convex part 7 Desiccant 8 Hygroscopic resin layer 9 Outer layer 10 Inner layer 11 Gas barrier resin layers 12, 12 Adhesive layer 13 Recycled resin layer

Claims (7)

A multilayer container obtained by blow molding a thermoplastic resin, wherein the multilayer container has a multilayer structure in which at least a moisture-permeable resin layer mixed with a desiccant and an outer layer formed of a moisture-resistant resin layer are provided outside the layer. The humidity control container characterized by the above-mentioned. 2. The moisture-controllable container according to claim 1, wherein an inner layer made of a moisture-permeable resin is provided inside the moisture-permeable resin layer mixed with a desiccant. 3. The container according to claim 1, wherein the moisture-permeable resin layer is made of a resin having a water vapor permeability higher than that of the moisture-resistant resin layer by 5.0 g / m ^{2 for} 24 hours or more. The humidity-controlling container according to any one of claims 1 to 3, wherein the moisture-permeable resin is made of a resin having a water vapor permeability twice or more that of the moisture-resistant resin layer. The moisture-permeable resin constituting the moisture-permeable resin layer is a low-density polyethylene, an ultra-low-density polyethylene, a linear low-density polyethylene, a polyolefin resin composed of a linear ultra-low-density polyethylene, polylactic acid, polyglycolic acid, or polyhydroxy resin. Polyhydroxyalkylates such as butyrate, polyε-caprolactone, homopolymers of aliphatic polyesters composed of polylactones such as polyvalerolactone, and biodegradable resins composed of a copolymer containing the aliphatic polyester as a main component, The humidity control container according to any one of claims 1 to 4, wherein the container is at least one thermoplastic resin selected from the group consisting of an ethylene-vinyl acetate copolymer, polyvinyl chloride, and polyamide. The humidity-controlling container according to any one of claims 1 to 5, wherein the moisture-resistant resin constituting the moisture-resistant resin layer is made of high-density polyethylene, polypropylene, or propylene-ethylene copolymer. The moisture-permeable resin layer is a resin layer in which low-density polyethylene is mixed with magnesium sulfate as a desiccant and having a powdered average particle size of 50 μm or less and having a chemical formula of MgSO ₄ .nH ₂ O (where 0 ≦ n ≦ 3). Wherein the outer layer is made of a resin layer made of high-density polyethylene, the inner layer is made of a resin layer made of low-density polyethylene, and a regrind layer containing high-density polyethylene is provided outside the moisture-permeable resin layer. Item 7. The humidity-controlling container according to any one of Items 1 to 6.

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