JP2000128277A - Highly airtight flexible container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To give a container an airtight property with reusability and easy foldability by forming a cylindrical part, an upper surface part, and a lower surface part with a tarpaulin of a constant value or lower in its oxygen permeability and water-vapor permeability respectively. SOLUTION: A barrier tarpaulin 11 is formed by setting a flange via an adhesive 12 on the end part of an opening formed by a material of an oxygen permeability of 20 cc/m2 and a water-vapor 10 g/m2.each 24 hr or lower, and including a ferrule main body 13, a disc-like ferrule 14, a ring-type packing 15, and a ferrule cramp 16. The ferrule main body 13 is formed by a cylindrical part 13a and an enlarged periphery 13b formed at its one end, and the outer wall of the cylindrical part 13a is adhesion-fixed with an inner wall of the end part of the opening. The enlarged periphery 13b is formed with a packing positioning groove 13c. The disc-like ferrule 14 operates to close the opening. The ring-type packing 15 is interposed between the groove 13c and the groove 14c, and the enlarged periphery 13d and outside periphery 14d are cramped by the ferrule cramp 16 so as to seal the opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly airtight flexible container. For more information,
The present invention relates to a highly airtight flexible container used for transporting and storing a substance requiring moisture proof or a substance whose contact with a gas such as oxygen is desired to be blocked.

[0002]

2. Description of the Related Art Conventionally, as a container for transporting or storing a substance requiring dust proofing, odor proofing, moisture proofing, etc., or an article whose contact with a gas such as oxygen is required, (1) a small capacity container is used. The inner bag made of a thermoplastic resin film with excellent gas barrier properties is used. (2) For medium capacity containers, a flexible container made of fiber woven fabric is used for a thermoplastic resin film with excellent gas barrier properties. Containers equipped with inner bags are used, and (3) stainless steel containers are currently used for large-capacity containers.

[0003] The containers (1) and (2) are often discarded after being used once without being reused, and the cost of an inner bag made of a thermoplastic resin film having excellent gas barrier properties is reduced. Since it is expensive, there is a drawback that the packaging unit price per stored item increases. The large-capacity container of the above (3) is excellent in strength and can be used repeatedly, but one container is expensive, the weight of the container is heavy, the volume of the container is large, and it is large to store it. If you need space,
There was a drawback that the packaging unit price per stored item was high.

[0004] It has been desired to put into practical use a container which solves the above-mentioned drawbacks, has high airtightness, can be used repeatedly, and is inexpensive in packaging unit price.
Japanese Patent Application Laid-Open No. 21589/1999 proposes a flexible container to which a gas barrier film is adhered.
JP-A-87902) and a parse chuck system, which are inferior in airtightness.

[0005]

SUMMARY OF THE INVENTION The present invention has been completed as a result of intensive studies to provide solutions to the above disadvantages. The objects of the present invention are as follows. 1. To provide a flexible container which can be used repeatedly, is easily folded, has a small storage space, and is excellent in airtightness. 2. To provide a highly airtight flexible container in which an inlet and an outlet of an article have an airtight structure. 3. To provide a highly airtight flexible container with a low packaging unit price per storage item.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a tubular body for storing articles, an article inlet provided sealably on an upper surface of the tubular body, and a structure are provided. Depending on the case, in a highly airtight flexible container provided with a powder discharge port sealably provided on the lower surface of the cylindrical body, the cylindrical body, the upper surface, and the lower surface may have an oxygen permeable property. 20 cc / m ² · 24 hr or less, moisture permeability 10 g /
Provided is a highly airtight flexible container comprising a tarpaulin of m ² · 24 hr or less, wherein the inlet and the outlet have a flange type structure or a cap type structure.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail.
In the highly airtight flexible container according to the present invention, the cylindrical body, the upper surface, and the surface are formed of tarpaulin having excellent gas barrier properties. The base fabric of the tarpaulin is made of a woven or knitted fabric, and examples of the woven or knitted fabric include natural fibers such as cotton and hemp, and synthetic fibers such as polyester fiber, nylon fiber and vinylon fiber. These fibers may be a blended yarn alone or in combination of two or more. The base fabric means a woven or knitted fabric obtained by weaving these fibers, and the type and structure of the woven or knitted fabric are not particularly limited as long as they exhibit performance for a flexible container. For example, a plain woven fabric having a fiber thickness of 250 to 1000 denier and a driving number of 15 to 30 fibers / inch is used. When the base fabric is a polyester fiber, a plain woven fabric of 750 denier fibers of 20 × 20 / inch is preferable.

The highly airtight flexible container according to the present invention is characterized in that at least one surface of the base fabric is a laminated film (A) made of a thermoplastic resin having excellent gas barrier properties. (A) ". The base fabric coated with the laminated film (A) has an oxygen permeability of 20 cc / m ² · 24 hr or less,
It is necessary that the moisture permeability is 10 g / m ² · 24 hr or less. Oxygen permeability of the tarpaulin is 20cc / m ² · 24
If the pressure exceeds hr or the moisture permeability exceeds 10 g / m ² · 24 hr, the obtained container cannot be called a highly airtight flexible container, and the object of the present invention cannot be achieved. Here, the oxygen permeability of the base fabric means a value measured according to JIS K7126, and the moisture permeability is JIS Z02.
08 means the value measured.

In order to exhibit the above-mentioned properties of the oxygen permeability and the moisture permeability of the base cloth, a film which exhibits the above-mentioned properties of the oxygen permeability and the moisture permeability is coated on a film covering at least one surface of the base cloth. Just use it. Examples of the laminated film (A) exhibiting the above characteristics of oxygen permeability and moisture permeability include (a) a laminated film containing a vinylidene chloride resin (PVDC) film in a thermoplastic resin film, and (b) ethylene / vinyl alcohol. A film made of a thermoplastic resin having excellent gas barrier properties, such as a laminated film containing a polymerized resin (EVOH) film, (c) a laminated film containing a thermoplastic resin film on which ceramic is deposited, and (d) a laminated film containing an aluminum foil. Is mentioned.

The vinylidene chloride resin (PVDC) in the film (a) includes polyvinylidene chloride,
A copolymer containing vinylidene chloride as a main component and another monomer copolymerizable therewith may be used. Examples of other copolymerizable monomers include vinyl chloride, ethylene, propylene, and vinyl acetate. Among them, a copolymer with vinyl chloride is preferred. The PVDC-containing laminated film may be unstretched or stretched, and the thickness of the film is selected in the range of 1 to 30 μm. A film in which a low-density polyethylene (LDPE) film or the like is laminated on the surface of PVDC.
DPE / adhesive / PVDC / adhesive / LDPE.

The film of ethylene-vinyl alcohol copolymer resin (EVOH) in the film of (b) is
Oxygen permeability and moisture permeability differ depending on the content of the ethylene component. Usually, it is preferable to select the ratio of the ethylene component of the copolymer resin in the range of 25 to 45 mol%. EVOH
The film may be unstretched or stretched, and the thickness of the film is selected in the range of 1 to 30 μm. The laminated film including this film is a film in which low density polyethylene (LDPE), high density polyethylene (HDPE), or the like is laminated on the surface of an EVOH film. The laminated film is composed of LDPE / adhesive / EVOH.
Film / adhesive / LDPE, HDPE / adhesive / EV
OH film / adhesive / HDPE.

The thermoplastic resin film obtained by vapor-depositing the ceramic in the film (c) has a thickness of 1 to 30 μm.
Film on one side, such as an EVOH film, a polyamide film, a polyester film, and a polypropylene film. Examples of the configuration of a laminated film including this film include LDPE / adhesive / ceramic vapor deposited film / adhesive / LDPE, HDPE / adhesive / ceramic vapor deposited film / adhesive / HDPE, and the like.

The laminated film having the aluminum foil of the film (d) interposed therebetween has an aluminum foil selected in the range of 5 to 30 μm as an intermediate layer, and has another resin on both surfaces thereof via an adhesive. Refers to those laminated with thin films made of aluminum. Other resin films include low density polyethylene (LDPE) and high density polyethylene (HDP).
E), a thin film such as an ethylene-vinyl acetate copolymer (EVA) or an ethylene-vinyl alcohol copolymer resin (EVOH).

Examples of the structure of a laminated film including an aluminum foil include LDPE / adhesive / aluminum foil / adhesive / LDPE, HDPE / adhesive / aluminum foil / adhesive / HDPE, EVA / adhesive / aluminum foil / adhesive Agent / EVA, EVOH / adhesive / aluminum foil / adhesive / EVOH, and the like. The film-like laminate including the aluminum foil may be a laminate having such a configuration, or may be a laminate having another laminate of the laminate having such a configuration. In particular, another resin film can be laminated on the entire surface or only on a portion to be bonded, in order to increase the bonding strength when bonding the same surface or the front and back surfaces of the base fabric with each other.

The tarpaulin may be coated on both sides with the above-mentioned laminated film (A) having excellent oxygen permeability and moisture permeability. However, since the cost is high, one side is made of a normal thermoplastic resin film (B). {Hereafter, this film is simply referred to as “film
(B) ". The thermoplastic resin constituting the film (B) is ethylene-
Polyolefins such as vinyl acetate copolymer (EVA), LDPE and HDPE. EVA may also contain an inorganic substance (filler), a processing aid, and the like.
The average particle diameter of the inorganic substance is preferably in the range of 5 to 200 μm. The processing aid is a phosphate ester-based liquid lubricant.

[0016] The above-mentioned base fabric is laminated film (A), film (B)
As a method of coating by (1), a film (B) in which one surface of a base fabric is melted between rolls is pressure-coated by a calendering method, and the other surface is thermally welded with the film (A). Method, (2) a method in which a film (B) in which one surface of a base fabric is melted between rolls is pressure-coated by a calendering method, and the other surface is coated with a laminated film (A) via an adhesive. , (3)
On both sides of the base fabric, the film (B) and the laminated film (A)
And the like are coated via an adhesive.

The structure of the highly airtight flexible container according to the present invention includes (a) a structure in which the article storage section has a cylindrical body, and (b) an upper side of the cylindrical body in the structure of (a) above. The upper surface portion is formed on the upper surface portion, and an article injection port having a smaller diameter than the cylindrical body portion is provided on the upper surface portion. (C) The lower side (bottom portion) of the cylindrical body portion having the structure of (b) above. And a structure provided with an article outlet smaller in diameter than the cylindrical body. In the flexible container having the above structure (a), the upper opening serves as an inlet as it is.

In the highly airtight flexible container according to the present invention, the tubular body, the upper surface and the lower surface are provided on both sides of the base cloth, regardless of the structure of any of the above (a) to (c). A laminated film (A) or a tarpaulin whose one surface is covered with a laminated film (A) and the other surface with a film (B) is prepared as a raw material. The shape of the container cylindrical body is not particularly limited, and may be any of a hexahedral quadrangular prism and a cylinder. A cylindrical type having no blind spot is particularly preferable from the viewpoint of smoothly performing operations such as injecting and discharging stored items into the container.

In the highly airtight flexible container according to the present invention, in any of the above structures (a) to (c), the ends of the inlet, the outlet, the cylindrical body and the like are of a flange type structure. Alternatively, the airtightness is ensured by a cap-type structure or the like. In the case of the flexible container having the structure (a), a flange-type structure having a diameter equivalent to the diameter of the cylindrical body or a structure capable of ensuring airtightness of a cap-type structure is formed.

In the case of the flexible container having the above-mentioned structure (b) or (c), the diameter is set to 1/3 to 3/10 of the diameter of the cylindrical body on the upper surface or the lower surface of the cylindrical body. A small-diameter cylindrical body may be connected, and the end of the small-diameter cylindrical body may have a flange-type structure or a cap-type structure capable of ensuring airtightness. To provide a small-diameter inlet and outlet on the upper surface of the cylindrical body, the upper surface of the cylindrical body is made of the same material as the cylindrical body. The airtightness can be improved by fixing the lower surface of the body made of the same material as the body by sewing or the like and bonding a rubber sheet to the sewn portion.

In the case of the flange type structure, in the flexible container having the structure (a), the flexible container having the structure (b) or (c) is provided inside the end of the cylindrical body. An opening ferrule is adhered and fixed to the inside of the opening end of the small-diameter tubular body connected to the upper surface or the lower surface of the tubular body via an adhesive. The opening ferrule is made of a synthetic resin such as polycarbonate, polyethylene, polypropylene, or hard vinyl chloride, or a metal, and has a cylindrical shape having a diameter capable of fitting to the inside of the opening end of the small-diameter cylindrical body at one end. And a flange at the other end is formed integrally with the cylindrical portion, so that an annular packing can be arranged when a circular lid is overlaid, and can be tightened by an opening ferrule clamp (described later). 1). The length of the cylindrical portion is a length that can secure a sufficient area that can be bonded to the inside of the opening end, and the thickness of the flange portion is sufficient to withstand the tightening force of the opening ferrule clamp.

In the case of the cap-type structure, the upper end of the cylindrical body is provided in the flexible container having the structure (a), and the flexible container having the structure (b) or (c) is provided with the cylinder. The upper inlet or lower outlet of the torso is sandwiched between two thin metal plates such as aluminum and fixed in a ring shape (see FIG. 2 described later). A packing and a cap can be arranged on the upper part of the fixing ring, fixed by a fixing bracket or the like and clamped (see FIGS. 4 and 6 described later).

Since the highly airtight flexible container according to the present invention is excellent in airtightness, when storing, storing and transporting articles in the storage section, after storing the articles, the internal pressure of the flexible container is reduced to 0.3 kg / kg. A pressurized state of cm ² gauge pressure or less can be maintained or reduced. By maintaining the pressurized state, it is possible to prevent dust, odor, moisture, gas, etc. from entering the container from the outside, and to prevent deterioration of the articles stored in the flexible container and maintain the quality. It is more preferable than the above.

The highly airtight flexible container according to the present invention has been described in detail above. When the article storage section has a large capacity, the peripheral wall of the article storage body is reinforced or lifted. Attach the torso belt to the appropriate location on the outer wall of the storage trunk for ease of installation, and attach the hanging part reinforcement base cloth, lifting belt, hanging metal fittings, etc. to the appropriate location on the outer wall of the article storage trunk to facilitate lifting, and attach the lifting rope. Is preferred.

The highly airtight flexible container according to the present invention is suitable for use in transporting and storing substances that are easily degraded or deteriorated when they come into contact with water, moisture, etc., in addition to gases such as air, oxygen and carbon dioxide. .

[0026]

Next, an example of a highly airtight flexible container according to the present invention will be described with reference to the drawings, but the present invention is not limited to this example.

FIG. 1 is a side view of an example in which the injection port of a flexible container is a flange type structure and has a high airtight structure.
FIG. 2 is a partially cutaway side view showing an example of a state in the middle of a processing step in which an end portion of a flexible container is reinforced to form an inlet / outlet with a cap-type structure and an airtight structure is formed. FIG. 4 is a partially cutaway side view showing an example in which a cap is put on an end of a bent flexible container and sealed, FIG. 4 is a perspective view showing an example in which the cap is sealed with a fixing band, and FIG. FIG. 6 is a partially cutaway side view showing a state where the cap is fixed by a fixing clamp, and FIG. 6 is a perspective view showing a state where the cap is fixed by a fixing clamp.

In FIG. 1, reference numeral 11 denotes a barrier tarpaulin, and a flange is attached to an end of an opening (injection port) formed by the barrier tarpaulin 1 via a sheet adhesive 12. The sheet adhesive 12 functions to reinforce the ends of the openings from the inner and outer surfaces. The flange includes a ferrule body 13, a disk-shaped ferrule 14, a ring-shaped packing 15, and a ferrule clamp 16. The ferrule body 13 is constituted by a cylindrical portion 13a and an enlarged peripheral portion 13b formed at one end of the cylindrical portion 13a, and an outer wall of the cylindrical portion 13a is adhesively fixed to an inner wall at an end of the opening. A groove 13c for packing arrangement is preferably formed in the enlarged peripheral portion 13b, and the enlarged peripheral portion 13d is preferably tapered.

The disk-shaped ferrule 14 closes the opening (injection port), forms a groove 14c for packing arrangement, and tapers the outer peripheral edge 14d. The ring-shaped packing 15 is arranged between the groove 13c on the ferrule main body side and the groove 14c of the disk-shaped ferrule, and the enlarged peripheral portion 13d and the outer peripheral portion 14d are clamped by the band-structured ferrule clamp 16, and the opening is formed. Can be sealed. In addition, a clamp 17 may be adhered to the outer peripheral wall surface of the injection port at regular intervals, a string may be adhered to the clamp 17, and a string may be hung between the opposed clamps to press the ferrule clamp 16 and the disc-shaped ferrule 14. .

FIG. 2 shows that the injection port provided in the upper surface of the cylindrical body of the barrier tarpaulin 21 is connected to two aluminum plates 2.
2, and 22a and 22b are the ends of the aluminum plate, in which the open end is bent outward to form a bent portion 23. The aluminum plate 22 reinforces the end of the barrier tarpaulin 21 and, at the same time, forms a bent portion 23 at the inlet to facilitate fixing the cap sealing the inlet.

FIG. 3 shows the packing 2 above the bent portion 23.
4 shows a state in which the cap 4 is placed, the cap 25 is covered, and the cap 25 is fixed by the clamp 26. FIG. 4 shows an example in which the outer wall (outer periphery) of the inlet cap 25 shown in FIG. 3 is surrounded by the concave portion of the fixing band 26 and fixed by the fastener 27. In FIG. 5, the packing 24 is disposed above the bent portion 23, and the cap 25 is covered.
A state in which the cap 25 is fixed to the bent portion 23 by the clamp 28 is shown. One end of the clamp is hung on the aluminum plate end 22a, and the cap 25 is pressed toward the bent portion 23 by the biasing arm 28b of the clamp. Cap 2
5 does not come off the inlet.

[0032]

As described above, the present invention has the following particularly advantageous effects, and its industrial utility value is extremely large. 1. The highly airtight flexible container according to the present invention has excellent flexibility in the cylindrical body portion and excellent folding workability, so that the container handling workability is excellent. 2. The highly airtight flexible container according to the present invention is made of a tarpaulin having excellent gas barrier properties and moisture permeability. Therefore, when no articles are stored, it can be folded, and the storage space can be reduced. Therefore, the packaging cost per storage item can be reduced. 3. Since the highly airtight flexible container according to the present invention has a structure in which the inlet and the outlet together with the cylindrical body have excellent airtightness, the transportation of the powder and the like which is easily deteriorated when it comes into contact with moisture or air, It is suitable for use in flexible containers used for storage and the like. 4. Since the highly airtight flexible container according to the present invention has a structure in which the inlet and the outlet together with the cylindrical body have excellent airtightness, the stored items are maintained in a pressurized or depressurized state,
It can be stored and transported while maintaining its packaging.

[Brief description of the drawings]

FIG. 1 is a side view of an example in which a filling port of a flexible container is formed in a highly airtight structure by a lung type structure.

FIG. 2 is a partially cutaway side view showing an example in which an inlet and an outlet are processed into a cap-type structure by reinforcing an end of a flexible container.

FIG. 3 is a partially cutaway side view showing an example in which a cap is placed on an end of a bent flexible container and sealed.

FIG. 4 is a perspective view showing an example of sealing a cap with a fixing band.

FIG. 5 is a partially cutaway side view showing a state where the cap is fixed by a fixing clamp.

FIG. 6 is a perspective view showing a state in which the cap is fixed by a fixing clamp.

[Explanation of symbols]

 11: Barrier tarpaulin 12: Adhesive 13: Ferrule body 14: Disc-shaped ferrule 15: Ring packing 16: Ferrule clamp 17: Clamp 21: Barrier tarpaulin 22: Aluminum plate 23: Bent part 24: Packing 25: Cap 26: Clamp 27: Fastener 28: Fixed band

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Yoshihiro Noguchi 4-4-2 Nihonbashi Honcho, Chuo-ku, Tokyo Mitsubishi Chemical Industrial Co., Ltd. F-term (reference) 3E070 AA31 DA11 DA12 DA18 VA13 WK01

Claims (4)

[Claims] 1. A cylindrical body for storing an article, an inlet for an article sealably provided on an upper surface of the cylindrical body, and a seal on a lower surface of the cylindrical body depending on the structure. In a highly airtight flexible container provided with a powder discharge port provided so as to be able to stop, a cylindrical body portion, an upper surface portion and a lower surface portion have an oxygen permeability of 20 cc / m ² · 24 hr or less, and a moisture permeability. Is made of a tarpaulin of 10 g / m ² · 24 hr or less, wherein the inlet and the outlet are air-tight structures. 2. The highly airtight flexible container according to claim 1, wherein the airtight structure is a flange type structure or a cap type structure. 3. A laminated film comprising a film of an ethylene-vinyl acetate copolymer resin, a laminated film comprising a vinylidene chloride resin film as a thermoplastic resin film, and an ethylene-vinyl alcohol copolymer resin. The film of claim 1, wherein the film is covered with a laminated film made of a thermoplastic resin having excellent gas barrier properties, such as a laminated film containing a thermoplastic resin film on which ceramic is deposited, and a laminated film containing an aluminum foil. Item 3. A highly airtight flexible container according to item 2. 4. An article can be stored and transported by storing an article in the storage section and maintaining the container under a pressure of 0.3 kg / cm ² gauge or less or a reduced pressure. Item 7. The highly airtight flexible container according to any one of items 3 to 10.