JP4086134B2 - Tube container - Google Patents

Description

表１に示すように、実施例のチューブ容器はいずれも、膨張率の評価が○であるのに対し、比較例のチューブ容器はいずれも×であった。このことから、中間層と内層の間を剥離可能に構成することにより、染毛剤に含まれる過酸化水素の分解によって発生する酸素を外部に排出できることが示された。
【００３３】
次に、前記実施形態から把握できる技術的思想について以下に記載する。
・ 前記ガス透過性を有する層と前記ガスバリア性を有する層との間に水蒸気バリア性を有する層を設けたことを特徴とするチューブ容器。このように構成すれば、容器本体に収容された内容物の重量減少を低減することができる。
【００３４】
【発明の効果】
本発明は、以上のように構成されているため、次のような効果を奏する。
本発明によれば、酸素、二酸化炭素などのガスを発生する内容物を収容するのに好適なチューブ容器を提供することができる。
【図面の簡単な説明】
【図１】 実施形態のチューブ容器を示す断面図。
【図２】 実施形態のチューブ容器を容器本体と内キャップと外キャップに分解して示す要部断面図。
【符号の説明】
１１…容器本体、１１ｂ…首部、１２…保護部材としての内キャップ、１４…内層（ガス透過性を有する層）、１５…中間層（ガスバリア性を有する層）。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a tube container for containing contents that generate a gas such as oxygen and carbon dioxide over time.
[0002]
[Prior art]
As this type of tube container, it is formed from an original laminate made of an outer layer made of synthetic resin, an inner layer made of synthetic resin (polyolefin resin), and a gas flow layer (paper or non-woven fabric) located in the middle. Japanese Patent Laid-Open No. 10-329850 discloses an “internally generated gas discharge type tube container”. In this tube container, the gas generated from the contents accommodated in the tube container passes through the inner layer and reaches the gas flow layer, and then is gradually discharged to the outside from the raw fabric cross section of the end seal portion. ing. For this reason, the internal pressure of the tube container rises excessively, and in the worst case, it does not burst.
[0003]
[Problems to be solved by the invention]
By the way, there are several types of tube containers depending on how to make them. In addition to laminated tubes formed from a laminate raw material as in the conventional tube containers described above, multilayer blow tubes formed by a multilayer blow molding method are known. It has been. Multi-layer blow tubes are characterized by higher strength than laminated tubes that are integrally formed after the body and shoulders / neck are formed separately because the body and shoulders / neck are formed separately. is there. Further, since the thickness of the shoulder portion can be reduced, the remaining amount when the contents are squeezed out to the end can be extremely reduced. For this reason, there are cases where multilayer blow tubes are widely used depending on the application. However, there has been no multilayer blow tube suitable for containing the contents that generate gas, such as oxygen and carbon dioxide that can be discharged to the outside. It has been.
[0004]
The present invention has been made paying attention to the problems existing in the prior art as described above. The object is to provide a tube container suitable for containing contents that generate gas such as oxygen and carbon dioxide.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the invention described in claim 1 is a tube container including a container main body formed by a multilayer blow molding method, and gas generated from contents contained in the container main body. Is configured such that when the gas flows between the innermost gas-permeable layer of the container body and the outer gas-barrier layer, the two layers are separated from each other, and the gas-permeable layer And part of the interface between the gas barrier layer and the gas barrier layer is exposed to the outside, and the gas flowing between the gas permeable layer and the outer gas barrier layer from the interface is exposed to the outside. And the gas-permeable layer is selected from high density polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, and polypropylene. Both formed by one polyolefin-based resin, a layer having the gas barrier properties of ethylene - and summarized in that formed by vinyl alcohol copolymer or a polyamide resin.
[0007]
Invention of Claim 2 makes it a summary for the tube container of Claim 1 that the thickness of the said container main body is 200-700 micrometers.
The invention described in claim 3 is the tube container according to claim 1 or claim 2, the thickness of the layer having the gas permeability is summarized in that a 50 to 250 [mu] m.
[0008]
According to a fourth aspect of the present invention, in the tube container according to any one of the first to third aspects, a protective member for protecting the tip of the neck is attached to the neck of the container main body. Is the gist.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is embodied in a tube container containing a hair dye containing hydrogen peroxide will be described with reference to the drawings.
[0010]
As shown in FIGS. 1 and 2, the tube container of the present embodiment includes a container main body 11, an inner cap 12 (protective member) and an outer cap 13 attached to the container main body 11. FIG. 1 is a cross-sectional view showing a tube container of the present embodiment, and FIG. 2 is a cross-sectional view showing the tube container in an exploded manner into a container main body 11, an inner cap 12, and an outer cap 13.
[0011]
As shown in FIG. 1, the container body 11 is formed by a multilayer blow molding method, and is an inner layer 14 that is a gas permeable layer, an intermediate layer 15 that is a gas barrier layer, and a gas permeable layer. It has a three-layer structure consisting of the outer layer 16.
[0012]
The thickness of the inner layer 14 is preferably 50 to 250 μm, and more preferably 100 to 250 μm. When the thickness of the inner layer 14 is less than 50 μm, the chemical resistance decreases. On the other hand, if it is thicker than 250 μm, gas permeability decreases. Further, the total thickness of the inner layer 14, the intermediate layer 15 and the outer layer 16, that is, the thickness of the container body 11 is preferably 200 to 700 μm, more preferably 300 to 600 μm. When the thickness of the container body 11 is thinner than 200 μm and thicker than 700 μm, the feeling of use is lowered.
[0013]
The inner layer 14 and the outer layer 16 which are gas permeable layers are formed of a polyolefin resin, and the intermediate layer 15 which is a gas barrier layer is formed of an ethylene-vinyl alcohol copolymer (EVOH).
[0014]
Specific examples of the polyolefin resin constituting the inner layer 14 and the outer layer 16 include high density polyethylene (HDPE), medium density polyethylene (MDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), polypropylene ( PP), ethylene-propylene copolymer, ethylene-butene copolymer, ethylene-hexene copolymer, ethylene-octene copolymer, ethylene-vinyl acetate copolymer (EVA), ethylene-methyl methacrylate copolymer, and An ionomer resin is mentioned. Among these, HDPE, MDPE, LDPE, LLDPE and PP are preferable. In addition, the kind of polyolefin-type resin may be the same in the inner layer 14 and the outer layer 16, and may differ.
[0015]
On the other hand, the ethylene-vinyl alcohol copolymer constituting the intermediate layer 15 preferably contains 36 mol% or less of ethylene units as a structural unit, more preferably 29 mol% or less.
[0016]
The container main body 11 is formed with a trunk portion 11a and a small-diameter neck portion 11b connected to one end (upper end in FIG. 1) of the trunk portion 11a. The other end (lower end in FIG. 1) of the body portion 11 a is closed by heat-sealing the inner layers 14 facing each other to form a bottom portion 17. At the tip of the bottom portion 17, the interface between the inner layer 14 and the intermediate layer 15 is exposed to the outside. On the other hand, an opening is formed at the tip (upper end in FIG. 1) of the neck 11b, and the interface between the inner layer 14 and the intermediate layer 15 is also exposed to the outside at the tip of the neck 11b.
[0017]
The inner cap 12 is formed separately from the container main body 11 and is fitted on the tip of the neck 11 b of the container main body 11. The outer cap 13 is formed separately from the container main body 11 and the inner cap 12, and is screwed to the tip of the neck portion 11b of the container main body 11 to which the inner cap 12 is attached. The inner cap 12 is formed with a communication passage 18 that communicates with the tip opening of the neck portion 11 b when the container body 11 is attached. One end (the upper end in FIG. 1) of the communication path 18 constitutes a discharge port 19 for discharging a hair dye (not shown) accommodated in the tube container. The discharge port 19 is normally closed by attaching the outer cap 13 to the neck 11b of the container body 11, but can be opened by removing the outer cap 13 from the neck 11b. Therefore, if the outer cap 13 is removed from the neck portion 11b and the body portion 11a is squeezed, the hair dye contained in the tube container can be discharged from the discharge port 19.
[0018]
The effects obtained by this embodiment will be described below.
-Oxygen generated by the decomposition of hydrogen peroxide contained in the hair dye contained in the tube container passes through the inner layer 14 having gas permeability and flows into the interlayer A between the inner layer 14 and the intermediate layer 15. Since the inner layer 14 and the intermediate layer 15 are not bonded by an adhesive, the oxygen flowing into the interlayer A between the inner layer 14 and the intermediate layer 15 is easily separated between the inner layer 14 and the intermediate layer 15, and as a result, A gap is generated between the inner layer 14 and the intermediate layer 15. Therefore, the oxygen that has reached the interlayer A between the inner layer 14 and the intermediate layer 15 passes through the gaps formed between the two layers 14 and 15 due to the separation of the inner layer 14 and the intermediate layer 15, and the interface between the inner layer 14 and the intermediate layer 15 is exposed. That is, it is gradually discharged to the outside from the tips of the butt portion 17 and the neck portion 11b. For this reason, there is no possibility that the oxygen generated by the decomposition of hydrogen peroxide contained in the hair dye will cause the internal pressure of the tube container to rise excessively and burst in the worst case.
[0019]
-Since the intermediate | middle layer 15 is formed with the ethylene-vinyl alcohol copolymer, the container main body 11 can exhibit high gas barrier property.
Since the intermediate layer 15 has a high gas barrier property, oxygen that has passed through the inner layer 14 and has flowed into the interlayer A between the inner layer 14 and the intermediate layer 15 can be efficiently guided to the buttocks 17 and the neck 11b.
[0020]
-Since the inner layer 14 and the outer layer 16 are formed with the polyolefin resin generally used by the multilayer blow molding method, the cost of the container main body 11 can be reduced.
[0021]
Since the inner cap 12 is fitted on the tip of the neck 11b of the container body 11, the tip of the neck 11b can be protected by the inner cap 12.
In addition, the said embodiment can also be changed and comprised as follows.
[0022]
The intermediate layer 15 may be formed of a polyamide resin (nylon).
-You may form the outer layer 16 with synthetic resins other than polyolefin resin.
An adhesive layer may be provided between the inner layer 14 and the intermediate layer 15 to bond the inner layer 14 and the intermediate layer 15 together. Alternatively, an adhesive may be blended with at least one of the constituent materials of the inner layer 14 and the intermediate layer 15 to bond the inner layer 14 and the intermediate layer 15 together. In the case of blending, the blending ratio of the adhesive is preferably 20 to 35% by weight.
[0023]
However, the adhesive strength between the inner layer 14 and the intermediate layer 15 in these cases is such that the oxygen generated from the hair dye passes through the inner layer 14 and flows into the interlayer A between the inner layer 14 and the intermediate layer 15. It is essential that the intermediate layer 15 is weak enough to peel off.
[0024]
The adhesive constituting the adhesive layer and the adhesive blended with the constituent materials of the inner layer 14 and the intermediate layer 15 are PP, HDPE modified with unsaturated carboxylic acid, acid anhydride, ester or amide. , LDPE, LLDPE, EVA and other modified polyolefin resins are preferred.
[0025]
-The inner layer 14 and the intermediate layer 15 may be partially bonded. For example, the inner layer 14 and the intermediate layer 15 may be bonded with a narrow adhesive band extending so as to connect the neck portion 11 b and the bottom portion 17. In this case as well, if the inner layer 14 and the intermediate layer 15 are configured to be peelable at places other than the adhesive band, the gas is discharged from the tips of the buttocks 17 and the neck 11b through the gap formed between the two layers 14 and 15. be able to.
[0026]
In the above embodiment, the present invention is embodied in a tube container containing a hair dye mixed with hydrogen peroxide. However, the present invention is specifically applied to a tube container containing a hair dye mixed with propylene carbonate or ethylene carbonate. May be used. Or you may materialize in the tube container which accommodates the decoloring agent and the permanent agent with which hydrogen peroxide, propylene carbonate, or ethylene carbonate was mix | blended. In the case of propylene carbonate or ethylene carbonate, carbon dioxide gas is generated by decomposition, but in this case as well, in the same manner as in the case of oxygen in the above embodiment, the carbon dioxide gas is discharged from the bottom portion 17, thereby causing excessive internal pressure of the tube container The rise can be prevented.
[0027]
In the embodiment, the container body 11 has a three-layer structure, but may have a multilayer structure of four or more layers. For example, a layer having gas barrier properties may be provided outside the outer layer 16, and a layer having gas permeability may be further provided outside thereof. Alternatively, a layer having a water vapor barrier property may be provided between the inner layer 14 and the intermediate layer 15. In the case where a layer having a water vapor barrier property is provided, it is possible to prevent water vapor from escaping to the outside, so that the weight loss of the contents (hair dye) can be reduced. The layer having a water vapor barrier property is formed of, for example, a copolymer of an olefin monomer such as ethylene and a cyclic olefin. Among them, alicyclic hydrocarbon compounds are preferable, alicyclic hydrocarbon compounds having an ethylenically unsaturated bond and a bicyclo ring are more preferable, and bicyclo [2,2,1] hept-2-ene derivatives are most preferable.
[0028]
【Example】
Next, the present invention will be described more specifically with reference to examples and comparative examples.
<Examples 1-3>
A container body having a three-layer structure composed of an outer layer, an intermediate layer and an inner layer as shown in Table 1 below was prepared by a multilayer blow molding method, and an inner cap and an outer cap were attached to the container body to prepare a tube container. However, no adhesive layer is provided between the intermediate layer and the inner layer of the container body, and the two layers can be peeled off.
[0029]
<Comparative Example 1>
A single layer container body (thickness 400 μm) made of LDPE was produced by blow molding, and an inner cap and an outer cap were attached to the container body to prepare a tube container.
[0030]
<Comparative Examples 2-4>
A container body having a three-layer structure composed of an outer layer, an intermediate layer and an inner layer as shown in Table 1 below was prepared by a multilayer blow molding method, and an inner cap and an outer cap were attached to the container body to prepare a tube container. However, an adhesive layer is provided between the intermediate layer and the inner layer of the container body, and the two layers cannot be peeled off.
[0031]
The tube container of each example of Examples 1 to 3 and Comparative Examples 1 to 4 was filled with a hair dye containing hydrogen peroxide, and a storage test was performed in which it was stored for 3 months in an atmosphere at 40 ° C. The thickness of the torso of the container body at a location moved 1 cm from the bottom in the neck direction was measured before and after the storage test, and the expansion coefficient was determined according to the following formula. And the value of the expansion coefficient of less than 10% was evaluated as ◯, the value of 10% or more and less than 35% was evaluated as Δ, and the value of 35% or more was evaluated as ×. The evaluation results are shown in Table 1.
Expansion rate (%) = [(thickness of body part after test−thickness of body part before test) / thickness of body part before test] × 100
[0032]
[Table 1]

As shown in Table 1, the tube containers of the examples all have an evaluation of the expansion coefficient of ◯, whereas the tube containers of the comparative examples all have x. From this, it was shown that oxygen generated by the decomposition of hydrogen peroxide contained in the hair dye can be discharged to the outside by configuring the intermediate layer and the inner layer to be peelable.
[0033]
Next, the technical idea that can be grasped from the embodiment will be described below.
- the feature and be Ruchi cube container in that a layer having a water vapor barrier property between the layer having the layer and the gas barrier properties with gas permeability. If comprised in this way, the weight reduction of the content accommodated in the container main body can be reduced.
[0034]
【The invention's effect】
Since this invention is comprised as mentioned above, there exist the following effects.
ADVANTAGE OF THE INVENTION According to this invention, the tube container suitable for accommodating the content which generate | occur | produces gas, such as oxygen and a carbon dioxide, can be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a tube container according to an embodiment.
FIG. 2 is an essential part cross-sectional view showing the tube container of the embodiment in an exploded manner into a container body, an inner cap, and an outer cap.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Container main body, 11b ... Neck part, 12 ... Inner cap as a protective member, 14 ... Inner layer (layer which has gas permeability), 15 ... Intermediate | middle layer (layer which has gas barrier property)

Claims (4)

A tube container having a container body formed by a multilayer blow molding method, wherein the gas generated from the contents contained in the container body has a gas-permeable layer on the innermost layer of the container body and an outer side thereof Both layers are peeled off when flowing between the gas barrier layer and a part of the interface between the gas permeable layer and the gas barrier layer is exposed to the outside. The gas permeable layer is configured to be discharged from the interface between the gas permeable layer and the gas barrier layer outside the gas permeable layer, and the gas permeable layer has a high density. Formed of at least one polyolefin resin selected from polyethylene, medium density polyethylene, low density polyethylene, linear low density polyethylene, and polypropylene, Ethylene a layer having a gas barrier property - tube container characterized by being formed by vinyl alcohol copolymer or a polyamide resin. The tube container according to claim 1, wherein the container body has a thickness of 200 to 700 µm . The tube container according to claim 1 or 2, wherein the gas permeable layer has a thickness of 50 to 250 µm . The tube container according to any one of claims 1 to 3, wherein a protective member for protecting a tip of the neck is attached to a neck of the container main body .

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