JP3531071B2 - A cylindrical closed container consisting of a metal base cylinder and a layer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention comprises a metal base tube,
An airtight cylindrical closed container in which the outer layer is tightly laminated on the outer wall surface, can be folded from its tail end region, and hardly causes air suction (air bag) into the container even after opening, More specifically, the present invention relates to a tube-type container for containing a viscous substance, and more particularly to a tube-type container suitable for containing an anaerobic substance such as cosmetics or pharmaceuticals.

[0002]

2. Description of the Related Art A tube made of a metal base cylinder, in which a heat-shrinkable resin cylinder is tightly fitted to the outer surface of the body, is disclosed in Japanese Patent Publication No. 36-19089. In addition, in a tube in which a synthetic resin tube is fitted on the outer surface of the body of a tube made of a metal base tube, a composite tube in which the ratio of the metal layer thickness to the synthetic resin layer thickness is regulated within a specific range is a practically developed one. -44257. Further, by adhering a sheet of a specific thickness to the outer periphery of the metal base cylinder portion of a specific thickness with an adhesive to integrate it, the above-mentioned spontaneous outflow of contents and air suction into the container (air bag). An extruded tube in which restoration and non-restoration of the tube are balanced to solve the problem is disclosed in Japanese Utility Model Laid-Open No. 60-78742.

However, the improvement of these existing tubular containers is directed to a method of bringing the resin cylinder into close contact with the outer wall surface of the metal base cylinder portion, and avoids even a slight air suction (air bag) into the container. There is nothing that focuses on what you do. The invention disclosed in Japanese Utility Model Laid-Open No. 60-78742 is intended to prevent the natural outflow of the contents to the outside of the container and to suppress the intake of air into the container within an appropriate limit. He has not even mentioned the problem resolution of.

Therefore, there is no example in which only the prevention of a slight inhalation of air or moisture into the container, which is the problem to be solved by the present invention, is raised as a problem. That is, the side edge portion of the metal cylindrical container causes a crack by violent bending accompanying the squeezing out of the contents, or a strong external force is applied to a portion where the layer thickness suddenly changes from the shoulder portion to the base cylinder portion. There is no suggestion of any means necessary to completely prevent the inhalation of air, moisture or the like due to a situation where a crack occurs at the location.

[0005]

DISCLOSURE OF THE INVENTION The object of the present invention is to solve the following problems which still remain in the conventional composite tube in which the coating is tightly fitted on the outer wall of the conventional metal base tube. The solution lies in: ◆ Intrusion of air and moisture from the outside of the container due to cracks at the boundary between the metal base cylinder and the shoulder (by suction)
◆ Prevents intrusion of air and moisture (by suction) from the crevices that often occur at the side edges as the metal base is folded from the tail end area

[0006]

The present invention has been completed as a result of earnestly looking for a fundamental solution to the above-mentioned problems, which have not been taken seriously in the past, but seriously. The present invention is defined in the following "basic constitution of container", "improved constitution 1 of container" to "improved constitution 9 of container" and "basic constitution of container for cosmetics or medicine".

[Basic Structure of Container] Thickness 90 to 150 μm
A layer with a thickness of 5 to 60 μm is closely laminated in the section from the shoulder to the tail on the outer wall of the metal base cylinder of m, and the thickness of the shoulder is 10 to 30 times the thickness of the base cylinder. An airtight cylindrical closed container that can be folded from its tail region.

[Improved configuration 1 of container] In an area where an outline line formed by cutting the container along a plane including the major axis of the container transitions from the shoulder portion of the container to the base cylinder portion, the extension line of the shoulder portion and the base cylinder portion The cylindrical closed container according to the "basic configuration", which is an arc commonly contacting an extension line or a straight line connecting between the extension lines.

[Improved Construction 2 of Container] The coating is gas permeable 4
The cylindrical closed container described in "Basic configuration of container" and "Improved configuration 1 of container", which is made of a material having a moisture permeability of 0 g / m ² · 24H or less and a water vapor permeability of 140 g / m ² · 24H or less.

[Improved Construction 3 of Container] The layer to be covered is gas permeable 1
Described in [Basic configuration of container] and "Improved configuration 1 of container" and "Improved configuration 2 of container", which are made of materials of 0 g / m ² · 24H or less and moisture permeability of 40 g / m ² · 24H or less. Cylindrical closed container.

[Improved Construction 4 of Container] The ratio of the thickness of the coating layer to the thickness of the metal base tube portion (the former / the latter) is 5/1 to 20.
The tubular closed container according to [Basic configuration of container] and "Improved configuration 1 of container" to "Improved configuration 3 of container", which is 1/1.

[Improved structure 5 of container] [Basic structure of container] and "improved container" in which the coating layer is a polyvinyl chloride resin, a thermoplastic polyester resin, a polyolefin resin and a resin composition of two or more thereof. The cylindrical closed container according to any one of [Structure 1] to [Improved Structure 4 of Container].

[Improved Construction 6 of Container] The thermoplastic polyester resin constituting the layer is polyethylene terephthalate,
Polyethylene terephthalate Isophthalate, polybutylene terephthalate and a resin composition comprising two or more thereof [basic constitution of container] and “closed constitution of container 1” to “improved constitution of container 5”. container.

[Improvement Structure 7 of Container] From the crystalline thermoplastic resin whose layer to be coated is a 1-olefin polymer or a crystalline composition of two or more thereof, a rubbery copolymer or a mixture of two or more thereof. [A basic structure of the container] and "improved structure 1 of the container" to "improved structure 6 of the container", which are formed from the following amorphous composition and a composition of a crystalline resin and a rubbery copolymer.
The cylindrical closed container according to.

[Improvement Structure 8 of Container] The coating is made of one or more polymers selected from ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene and 1-decene. , A crystalline thermoplastic resin or a crystalline composition of two or more thereof, a rubbery copolymer or an amorphous composition of two or more thereof, and a composition of a crystalline resin and a rubbery copolymer "Basic configuration of the container" formed from
And the cylindrical closed container according to "improved structure 1 of container" to "improved structure 7 of container".

[Improved Construction 9 of Container] The heat-adhesive polymer is modified with at least one selected from maleic anhydride, tetrahydrophthalic anhydride, norbornene-2,3-dicarboxylic anhydride and itaconic anhydride. Quality ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-
Crystalline thermoplastic resin consisting of one or more polymers selected from octene and 1-decene, crystalline composition of two or more thereof, rubbery copolymer or amorphous composition of two or more thereof And a cylindrical closed container described in "basic constitution of container" and "improved constitution of container 1" to "improved constitution of container 8", which are formed of a composition of a crystalline resin and a rubbery copolymer. .

[Basic structure of cosmetic or pharmaceutical container] The outer wall of the metal base cylinder having a thickness of 90 to 150 μm has a thickness of 5 to 60 μm in the section from the shoulder to the tail and a gas permeability of 40 g / The resin coating layers with m ² · 24H or less and moisture permeability of 140 g / m ² · 24H or less are closely laminated, and the thickness of at least the peripheral region of the shoulder is 10 to 30 times the thickness of the base cylinder. An airtight cylindrical closed container for cosmetics or medicine, which can be folded from the tail end region of the base cylindrical portion.

[Improving constitution 1 of container for cosmetics or medicine] The resin coating layer has a gas permeability of 10 g / m ² · 24H or less and a moisture permeability of 40 g / m ² · 24H or less, and the length of the container is The contour line that appears when the container is cut along a plane including the axis is an arc that commonly contacts the extension line of the shoulder portion and the extension line of the base tubular portion in the region where the container transitions from the shoulder portion to the base tubular portion, or both A cylindrical closed container for cosmetics or medicine as described in "Basic configuration of a container for cosmetics or medicine" which is a straight line connecting the extension lines.

[Improvement Structure 2 of Cosmetic or Pharmaceutical Container] The thermoplastic polyester resin constituting the layer is polyethylene terephthalate, polyethylene terephthalate isophthalate, polybutylene terephthalate and a resin composition comprising two or more of them. [Basic configuration of container] and "improved configuration 1 of container" to "improved configuration 5 of container"
The cylindrical closed container according to.

<Preferred Embodiment of the Invention> The shape and constitution of the airtight metal tubular closed container of the present invention (hereinafter, may be abbreviated as “the container of the present invention”) will be specifically described with reference to the drawings. To do. FIG. 1 is a schematic partial cutaway vertical sectional view of the container of the present invention. In FIG. 1 (a), reference numeral 1 represents the entire container of the present invention, which is composed of the following parts: a substantially cylindrical base cylinder A substantially conical shoulder 12 connected to the top of the parts 11, 11.
It is formed of a substantially cylindrical mouth / neck portion 13 rising from the top of 12 and a folding portion 15 formed in a tail end region 14z of the base tube portion 11. The thickness of the shoulder portion 12 is significantly larger than the thickness of the base tube portion 11, that is, approximately 1.5 to 3 times, preferably 1.2.
The thickness is set to be about 2.5 times, and the layer 2 is tightly laminated on the outer wall 11e of the base cylinder portion 11 from near the outer circumference (lower end) of the shoulder 12 toward the tail end 14. The overlay 2 is usually formed of a polymer that is heat-adhesive to metals. The container 1 then has its tail end 14
The base tube portion 11 is hermetically sealed by being tightened.

FIG. 1 (b) is a schematic partial cutaway vertical sectional view of a conventional similar container, in which the layer 2 is an outer wall 11 of a base tube portion 11.
It shows that e is covered only up to a position closer to the tail end 14 than the top 11t. In this case, crack 1 on top 11t
When 1 uc occurs, it invites a situation where the outside air is sucked from the outside of the container 1. The direct cause for this is the negative pressure generated inside the container 1 after the contents are squeezed out from the container 1. However, the indirect cause can be attributed to that the base tube portion 11 of the container 1 is thinner than the shoulder portion 12, and the layer 2 is difficult to cover up to this area 11t.

Therefore, as in the container 1 of the present invention shown in FIG. 1 (c), the peripheral region 12p of the shoulder portion 12 is made to be significantly thick so that it also supports the top portion 11t of the base cylinder portion 11. In this case, the top portion 11t is less likely to be cracked, and even if a crack uc is generated near the tail end instead of the crack, the contents are completely shielded from the outside air by the layer 2 so that the contents are altered. Is blocked. Although the thickening treatment of the shoulder portion 12 can be performed not only in the peripheral region 12p but also in the central region, it is not necessary and causes an increase in cost.

The average thickness (wall thickness or layer thickness) of the base tube portion 11 in the container 1 of the present invention is usually set to 80 to 180 μm, preferably 90 to 150 μm. When the thickness of the base tube portion 11 is 75 μm or less, the durability becomes insufficient. In particular, in order to thoroughly squeeze out the contents, it becomes difficult to endure the tendency of making the surface of the base tube portion 11 strong and squeezing. On the contrary, the thickness of the base tube portion 11 is 20
If the thickness is 0 μm or more, the base tube portion 11 bulges (spring back) after the content is extruded, so that the tendency to suck in air, moisture, or the like becomes stronger, but this should be thoroughly prevented. The cause is the elastic recovery of the metal. In addition to that, it is difficult to bend the container 1 from the tail end 14 by fingers to push out the contents, and it causes an increase in weight and an economical disadvantage.

In the container 1 of the present invention, an upper limit is set on the thickness of the metal base cylinder portion 11 in order to avoid elastic recovery, and the layer 2 laminated on the outer wall 11e promotes elastic recovery. The thickness and flexural modulus of elasticity are also limited to a specific range so as not to do so. No improvement from this point of view is described in the conventional resin-coated metal tubular container.

The thickness (wall thickness) of the shoulder portion 12 of the container 1 of the present invention, particularly the peripheral region 12p thereof, is set to 10 to 30 times, preferably 11 to 22 times, the thickness of the base tube portion 11. Is beneficial. The purpose thereof is to prevent inhalation (invasion) of air and moisture from the outside of the container due to the crack 11uc that is likely to occur near the boundary 11b as shown in FIG. 1D or the crack that is likely to occur at the side edge portion 11. Especially. As another measure for preventing the inhalation (invasion) of air and moisture from the outside of the container, it seems that it suffices to tightly stack the layer 2 on the outer wall 11e so as to cover the top portion 11t of the base tube portion 11. However, in practice, the layer 2 is applied up to the part 11t where cracks are most likely to occur.
It is difficult to completely stack them.

The alternative strategy shown in FIG. 2 is also useful.
That is, the outer wall 11be near the boundary 11b is formed into a smooth curved surface as shown in (d) of FIG. 2, or even if it is not curved, as shown in (e) of FIG. , Chamfering measures are also useful. The curved surface means that the shape is common to both the extension line of the shoulder portion 12 and the extension line of the base tube portion 11 in the outline of the container 1 that appears when the container 1 is cut along a plane including the long axis of the container 1. It is a measure to make a curve (usually an arc) that touches. The radius of curvature (r) of this arc is usually 1 to 5 mm, preferably 1 to 2 when the thicknesses of the above parts are assumed.
If it is set to mm, in most cases, cracking can be sufficiently prevented (molding strain is relaxed). The cause is that the normal contour line is bent at the intersection of the extension line of the shoulder portion 12 and the extension line of the base tube portion 11, that is, the molding strain is likely to remain in this region.

Here, what should be emphasized is a crack preventing treatment in the container 1 of the present invention, that is, a treatment for making the above-mentioned curved surface or chamfering the area 11be which transitions from the shoulder portion 12 to the base cylinder portion 11 via the boundary 11b. This is to fully demonstrate its effectiveness in combination with the thickening of the peripheral region 12p of the shoulder portion 12.

The covering layer 2 in the container 1 of the present invention is the base tube portion 1.
1 is tightly laminated on the outer wall 11e, and the outer wall 11e is heat-bonded to the outer wall 11e due to the adhesiveness of the resin layer itself to the metal, or is watertight (airtight) due to the interposition of another heat-adhesive polymer. Are combined. The purpose is to break through the cracks from the outside of the container 1 even if the side edge 11s (indicated by a one-dot chain line) has a crack 11c as a result of the base tube portion 11 being crushed by being tightened from the tail end 14 thereof. It is to prevent the situation where air and humidity are sucked in (entered).

Therefore, in the resin layer 2, the base tube portion 11 is tightened so that at least one of both side edge portions 11s is cracked 11c.
Even if the above occurs, it is still necessary to cover the base tube portion 11 in a watertight manner. That is, it is necessary that the watertight coating (layer to be coated 2) has a metal adhesion and a film strength capable of withstanding a strong bending generated on both side edge portions 11s due to the tightening. The resin layer 2 may be a laminate of two or more layers, and if the single layer is a biaxially stretched layer, it is uniaxially stretched if it is difficult to achieve the required level of perforation strength or tear strength. It is advantageous to stack two or more layers so that the stretching (orientation) directions of both layers are as orthogonal as possible. Of course, the materials of both layers may be different from each other.

<Material> ◆ Material Metal The metal base tube portion 11 of the container 1 of the present invention is usually selected from soft metals such as aluminum and its alloys and tin and its alloys, which are highly ductile and malleable. Made of metal. Of course, in addition to that, it is necessary that the material itself is not susceptible to corrosion such as rusting, that the content is not altered, and that it is harmless to humans and animals. From the above viewpoints, the metals that are commonly used and commonly used are aluminum and its alloys. Incidentally, in order to eliminate the state where the strain (stress) due to the plastic working remains, it is preferable to perform a treatment called annealing or annealing after the working.

◆ Material Resin The resin layer 2 in the container 1 of the present invention has the above-mentioned required properties, especially when a crack is generated in the side edge portion 11s of the base tube portion 11, the portion is kept watertight in a continuous manner. It has a mission of protecting the container 1 from the outside of the container 1 from being sucked in (invaded) from the outside through the crack. In order to fulfill its mission, the layer 2 has a tensile strength of 500 kgf / cm ² or more, preferably 700 kgf / cm ² or more,
Flexural modulus 800-1kgf / mm ² , preferably 600-1k
gf / mm ² , gas permeability 40g / m ² · 24H or less, preferably 10
g / m ² · 24H or less, more preferably 1 g / m ² · 24H or less and water vapor permeability 140 g / m ² · 24H or less, preferably 40 g / m ² · 24H or less,
More preferably, it is formed of a material of 20 g / m ² · 24H or less.

In addition to the above properties, the layer 2 has a base tube portion 11
It is preferable that the outer wall 11e (including the side edge portion 11s) has an adhesive property, particularly a thermal adhesive property, capable of being tightly coupled. If the layer 2 cannot bond to the outer wall 11e of the base tube portion 11 by itself as tightly as required at room temperature and at the time of heating, the adhesion between them is realized or strengthened. An adhesive substance to be obtained can be interposed.

Any material having the above properties can be used as the layer 2 to be coated. The material is usually a thermoplastic resin such as polyvinyl chloride resin (PVC), a thermoplastic polyester resin such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT) and polyethylene isophthalate terephthalate (PEI).
T), polybutylene isophthalate terephthalate (P
BIT) and mixed polyesters of two or more kinds thereof, polyolefin resins and the like. Among them, the preferred resin is PET, and PET having a high level of surface gloss and surface slipperiness is preferred.

A homologue of polyethylene terephthalate (PET), polyethylene terephthalate isophthalate (PETI), etc., which is a preferred material for forming the coating layer 2, has a thickness of 1
Tensile strength of mill film (commonly known as 25μ film) 600 kgf / mm ² or more, preferably 1100 kgf / cm ² or more, gas permeability (especially CO ₂ ) 10 g / m ² · 24H or less, moisture vapor transmission rate 40 g / m ² · 24 H or less Demonstrate the performance of.

Examples of the crystalline polyolefin include polyethylene, polypropylene, poly-1-hexene, poly-4-methyl-1-pentene, poly-1-decene and the like, and compositions of two or more thereof. These include not only homopolymers but also copolymers. Therefore, polyethylene is an ethylene homopolymer, an ethylene-propylene copolymer, an ethylene-1-butene copolymer, etc., and the copolymerization component (comonomer) on the small side is usually 15 units in the copolymer.
It is contained in an amount of not more than mol%, preferably not more than 10 mol%. However, in the case of a so-called block copolymer, the crystallinity is not impaired even if the comonomer content is higher than the above value. Similarly, propylene is not limited to propylene homopolymer, but copolymers such as propylene-ethylene copolymer, propylene-1-butene copolymer, propylene-ethylene-
1-butene copolymers and the like can also be used. Similar restrictions are imposed on the content of comonomer in the copolymer as in the case of ethylene copolymers. These may be two or more polyolefin compositions.

<Properties Required for Each Layer> The properties required for the metal layers forming the base tube portion 11 are the above-mentioned “raw metal”.
There is nothing particularly added other than the performance required for the metal itself described in the section. If added by force, the base tube portion 11
That is, stress (strain) is sufficiently relaxed by annealing (annealing) performed after plastic working (also known as “backward extrusion”) from a metal (ingot). That is, it is possible to easily eliminate the state in which the stress generated by the large external force applied during the plastic working remains.

If the layer 2 is formed from the material resin, the performance required from the application may not be sufficient in terms of tensile strength, flexural modulus, gas permeability and moisture permeability. In particular, the gas permeability of 40 g / m ² · 24 H or less, preferably 10 g / m ² · 24 H or less, as the performance required for the coating layer 2,
To impart a moisture permeability of 140 g / m ² · 24H or less, preferably 40 g / m ² · 24H or less, more preferably 20 g / m ² · 24H or less,
Various measures in the next section can be adopted.

<Performance Improving Method for Layer 2> ◆ When the layer 2 is made of an amorphous resin or a low crystalline resin, it is effective to stack it with a crystalline resin layer. This measure is because various combinations can be selected to complement the advantages and disadvantages of both resins. ◆ When the layer 2 is formed of a crystalline resin, it is extremely useful to perform the following secondary processing: ◆ When the layer 2 is a single layer made of a crystalline resin, after film formation It is biaxially stretched in mutually perpendicular directions as much as possible, or ◆ When the layer 2 is a composite layer composed of two or more layers using a crystalline resin, each layer is uniaxially stretched. Or they are tightly laminated so that their orientation directions are orthogonal to each other, or ◆ When the layer 2 is a composite layer consisting of two or more layers using a crystalline resin, biaxial stretching is applied to each layer. The applied products are tightly laminated so that the respective orientation directions cross each other obliquely. As a modification in this case, it is also possible to adopt a mode in which biaxially stretched layers having greatly different stretching ratios in the respective axes are tightly laminated so that the axial directions having a large stretching ratio are orthogonal to each other.

In the case of uniaxial stretching, the above stretching ratio (orientation ratio) is usually set to 2 to 10 times, preferably 3 to 8 times,
In the case of biaxial stretching, it is usually 1.5 in the longitudinal direction (longitudinal direction).
6 times, preferably 2 to 5 times, and usually 2 to 8 times in the lateral direction, preferably 2.5 to 6 times. The orientation rate of the coating layer 2 in the container 1 of the present invention may be set such that the rate in the lateral direction is set to be larger than the rate in the longitudinal direction by virtue of the sharp ridges appearing at the edges of the side edge 11s of the base tube portion 11. Is also important for making it difficult to cut.

<Preparation of Container> In order to mold the base cylinder portion 11 of the container 1 of the present invention, the metal ingot is loaded into the cylindrical ram, and then the plunger (plug) is brought into contact with the metal ingot. After that, the plunger is hydraulically advanced to perform plastic working (backward extrusion). The obtained substantially cylindrical container prototype is closed at the mouth / neck portion 13 rising from the apex thereof, and a screw for cap screwing is cut around the periphery thereof,
On the other hand, the other end of the container prototype is open.

Next, a film made of a thermoplastic resin such as polyvinyl chloride resin is wound around the outer wall 11e of the prototype of the container 1 (container prototype) to laminate the layer 2 to be covered. A polyurethane adhesive is applied to the inner surface of the film (the surface that adheres to the base tube portion 11) and wrapped around the base tube portion 11 of the container prototype, and the softening temperature (Tsp) of the polyvinyl chloride resin is slightly higher than 82 ° C. Then, the applied adhesive is solidified and is tightly laminated and adhered to the outer wall 11e of the base tube portion 11. Usually, necessary characters and / or designs can be printed in advance on predetermined portions of the layer 2. When printing, take into account the deformation due to shrinkage. On the contrary, it is also possible to previously print necessary characters and / or designs on the surface 11e of the base cylinder 11 of the container prototype.

Next, the base tube portion 11 with the layer 2 to be obtained is charged with a paste such as cosmetics, pharmaceuticals or the like from the tail end 14 and then the tail end 14 is crushed from both sides and then subjected to a tightening process. By this process, the tail end region 14z of the base tube portion 11 is closed (sealed) in a sufficiently watertight manner.

[0043]

In the container 1 of the present invention, the following various effects are exhibited: ◆ The thickness of the shoulder 12 connected to the top 11t of the base cylinder 11 is 10 to 30 times the thickness of the base cylinder 11. Since it is doubled, a crack is generated at the boundary 11b between the shoulder 12 and the base tube 11.
Does not occur in the vicinity of (the area sandwiched by), and even if a crack occurs, it is the base tube portion 11, so that the contents are shielded from the outside air by the layer 2 covering 11 and its alteration is prevented. ◆ The radius of curvature (r) of the contour line appearing in the longitudinal section near (the area sandwiching) the boundary 11b between the shoulder 12 and the base cylinder 11.
Can be fully enjoyed with a crack prevention effect by increasing the thickness of the above-mentioned shoulder 12 peripheral region 12p while forming a curved surface of 1 to 4 mm. ◆ From the top 11t to the tail end 1 of the outer wall 11e of the base cylinder 11.
The layer 2 tightly laminated in the sections up to 4 substantially covers (seals) cracks that may occur in the vicinity of the side edge 11s of the base cylinder 11, so that the contents are completely shielded from the outside air. As a result, the alteration is prevented.

[0044]

EXAMPLES The container of the present invention and the method for producing the same will be specifically described below based on Examples. However, the invention is not so limited.

[0045]

[Example 1] A mouth-neck portion 13 is formed from one end of an aluminum cylinder (outer diameter 17.3 mm; thickness 0.13 mm; length 111 mm) to a predetermined length, and the subsequent portion is expanded into a conical shape. After forming the shoulder portion 12 (thickness 1 mm; shoulder angle 120 degrees), it extends in the long axis direction and moves to the base cylinder portion 11 (length 111 mm), and the end 14 of the base cylinder remains in the open state. After the inner wall of the portion 11 is coated with a thermosetting resin, the outer wall 11e thereof is covered with polyethylene terephthalate resin (PE
The coating layer 2 made of a film made of T) (film thickness: 54 μm) was wound, and the coating layer 2 was cut by 4 mm shorter than the tail end 14 of the base tube portion 11. A polyurethane resin was previously applied as a thermal adhesive to the inner wall of the film. Next, after loading 15 g of the content paste into the base tube portion 11 and crushing it by sandwiching the tail end 14, the tail end 14 was folded and the inner walls of the tail end region 14z were brought into close contact with each other to obtain 10 sample containers. .

After piercing a through hole in the mouth and neck 13 of the sample container 1 containing the obtained contents, the tail end region 14z of the container 1 is opened.
Observation was performed while gradually advancing the folding in and extruding the containing paste. As a result, the air bag from the through hole was substantially prevented. Further, even in the example in which a crack is generated as a result of the side edge portion 11s being bent as the tightening is advanced, the suction of air, moisture and the like from the outside of the container causes the layer 2 to be tightly laminated on the outer wall 11e. Blocked by contributions.

[Brief description of drawings]

FIG. 1 is a schematic vertical cross-sectional view of a cylindrical container, and FIG. 1 (a) shows a structure of the container of the present invention from a shoulder portion to a tail end region via a base cylindrical portion. 1 (b) shows the structure from the shoulder portion to the base cylinder portion in the conventional similar container. Figure 1
(C) shows a configuration in which the shoulder portion is thickened in the container of the present invention and the shoulder portion reaches the base cylinder portion.

FIG. 2 is a schematic partially enlarged cutaway view of a vertical cross-sectional view of the container of the present invention, in which (d) of FIG. 2 is a first example of its modification and (e) of FIG. 2 is a modification. A second example of is shown.

[Explanation of symbols]

1 Overall Container of the Present Invention 2 Covered Layer in the Container of the Present Invention 11 Base Tube Part in the Container of the Present Invention 12 Shoulder Part 13 in the Container of the Present Invention 14 Mouth and Neck Part in the Container of the Present Invention 15 Tail End 15 in the Container of the Present Invention Bounding 11b between the shoulder and the base cylinder of the container of the present invention 11e Outer wall 11s of the base cylinder of the container of the present invention 11s Side edge 11t of the container of the present invention of the base cylinder of the container of the present invention Top part 12p Shoulder area 14z in the container of the present invention 14z Tail area 11be in the container of the present invention Area 11dc that sandwiches the boundary between the shoulder and the base tube in the container of the present invention 11dc Occurs in the side edge of the container of the present invention Cracks 11uc Cracks near the shoulder of the container of the present invention

Claims (13)

(57) [Claims] 1. A thickness of 5 to 60 μm in the section from the shoulder to the tail of the outer wall of the metal base cylinder having a thickness of 90 to 150 μm.
An airtight cylindrical closed container in which m layers are tightly laminated and the thickness of at least the peripheral portion of the shoulder portion is 10 to 30 times the thickness of the base tubular portion and can be folded from the tail end region. . 2. The extension line of the shoulder portion and the extension line of the base tubular portion are common in the region where the contour line that appears when the container is cut on a plane including the major axis of the container transitions from the shoulder portion of the container to the base tubular portion. The cylindrical closed container according to claim 1, which is an arc that is in contact with or a straight line that connects the two extension lines. 3. The cylindrical closed container according to claim 1, wherein the layer to be coated is made of a material having a gas permeability of 40 g / m ² · 24H or less and a water vapor permeability of 140 g / m ² · 24H or less. 4. The cylindrical closed container according to claim 1, wherein the layer to be coated is made of a material having a gas permeability of 10 g / m ² · 24H or less and a moisture permeability of 40 g / m ² · 24H or less. . 5. The ratio (former / latter) of the thickness of the layer to the thickness of the metal base cylinder is 5/1 to 20/1.
The cylindrical closed container according to any one of claims 1 to 4. 6. A polyvinyl chloride resin, a thermoplastic polyester resin, a polyolefin-based resin, and two of these layers as the coating layer.
The tubular closed container according to claim 1, which is one or more resin compositions. 7. The cylindrical closed mouth according to claim 1, wherein the thermoplastic polyester resin constituting the layer to be coated is polyethylene terephthalate, polyethylene terephthalate isophthalate, polybutylene terephthalate, or a resin composition comprising two or more thereof. container. 8. A crystalline thermoplastic resin whose layer to be coated is a 1-olefin polymer, a crystalline composition of two or more thereof, a rubbery copolymer or an amorphous composition of two or more thereof. The tubular closed container according to any one of claims 1 to 7, which is formed of a composition of a substance and a crystalline resin and a rubbery copolymer. 9. A crystalline thermoplastic having an underlayer made of one or more polymers selected from ethylene, propylene, 1-butene, 1-hexene, 4-methyl-1-pentene, 1-octene and 1-decene. A resin or a crystalline composition of two or more thereof,
The tubular shape according to any one of claims 1 to 8, which is formed from a rubbery copolymer or an amorphous composition composed of two or more kinds thereof, and a composition of a crystalline resin and a rubbery copolymer. Closed container. 10. The heat-adhesive polymer is maleic anhydride,
Ethylene, propylene, 1-butene, 1-modified with at least one selected from tetrahydrophthalic anhydride, norbornene-2,3-dicarboxylic anhydride and itaconic anhydride
Crystalline thermoplastic resin comprising one or more polymers selected from hexene, 4-methyl-1-pentene, 1-octene and 1-decene, or two or more crystalline compositions thereof, rubbery copolymer Alternatively, the cylindrical closed container according to any one of claims 1 to 9, which is formed of an amorphous composition composed of two or more kinds thereof and a composition of a crystalline resin and a rubbery copolymer. 11. A thickness of 5 to 60 in a section from a shoulder portion to a tail portion of an outer wall of a metal base tubular portion having a thickness of 90 to 150 μm.
μm, gas permeability 40g / m ² · 24H or less and water vapor permeability 140g
/ M ² · 24H or less resin layers are tightly laminated, and the thickness of at least the peripheral area of the shoulder is 10 to 30 times the thickness of the base tube, and it is folded from the tail end area of the base tube. Cylinder-type closed container for airtight cosmetics or medicines that can be tightened. 12. The resin coating layer has a gas permeability of 10 g / m ² · 24.
Shoulder of less than H and moisture permeability of 40g / m ² · 24H or less, in the area where the contour line appearing after cutting the container along the plane including the major axis of the container transitions from the shoulder part of the container to the base cylinder part. 12. The cylindrical closed container for cosmetics or medicine according to claim 11, which is an arc that is commonly in contact with the extension line of 1. and the extension line of the base tubular portion, or is a straight line that connects the extension lines. 13. The tubular closed mouth according to claim 11 or 12, wherein the thermoplastic polyester resin constituting the layer to be coated is polyethylene terephthalate, polyethylene terephthalate isophthalate, polybutylene terephthalate or a resin composition comprising two or more thereof. container.