JPH06210123A - Moisture absorber and its production - Google Patents

Abstract

PURPOSE:To produce a moisture absorber, the vessel of which is reduced in volume and discarded after use, and with the plastic withstanding the minimum use. CONSTITUTION:This moisture absorber 1 consists of an outer vessel 3 with the upper surface opened and an inner vessel 2 for contg. a deliquescent moisture absorbent 9 to close the outer vessel 3. The inner vessel 2 is a double bag of a porous inner bag 6 for contg. the absorbent 9 and an outer bag 7 for contg. moisture. The opening of the upper surface of the double bag 5 is sealed by a microporous film 8. The outer vessel 3 and inner vessel 2 are fixed between the open end of the outer vessel 3 and the microporous film 8 of the inner vessel 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hygroscopic material which can be placed inside furniture, a closet, a storage cabinet or the like to remove moisture from the interior and reduce the influence of moisture on the articles stored inside.

[0002]

2. Description of the Related Art Heretofore, this type of hygroscopic material has been formed by welding a basket-shaped middle container made of a similar hard plastic to an outer container made of a hard plastic such as high-density polyethylene and having an upper surface opening. It is known that the inside of the container is sealed with a microporous film. In this hygroscopic material, moisture in the air passes through the microporous film, becomes water by the hygroscopic agent in the inner container, passes through the eyes of the basket of the inner container, and accumulates in the outer container. Since the inner container and the outer container are integrated by welding, the water in the outer container does not leak. When the outer container is full of water or the dehumidifying agent runs out, the dehumidifying material is discarded as it is.

[0003]

In such a moisture absorbent, as described above, when the dehumidifying agent is used up,
Although the dehumidifying material is discarded together with the conventional dehumidifying material, it is not only bulky at the time of disposal after use because it is made of hard plastic, but it is also cautious about waste disposal. At present, there was a problem in discarding many plastics as they were. In particular, there is a growing demand for reduction of plastic waste in the future, and even for containers of hygroscopic materials, since it is a disposable type for home use, the impact of weight reduction will be great and the social responsibility will be great. I have to say.

Therefore, according to the present invention, when the container is disposed of after use, the container itself does not become bulky and can be compacted and disposed of. Further, the use of plastic can be minimized and the weight can be reduced. It is an object of the present invention to provide a hygroscopic material and a method for producing the hygroscopic material.

[0005]

SUMMARY OF THE INVENTION In view of the above points, the present invention provides a hygroscopic material of the present invention which is fixed to an outer container having an upper surface opening and an opening end portion of the outer container to seal the outer container. In a hygroscopic material composed of an inner container for accommodating a deliquescent hygroscopic agent contained in an outer container, a porous inner bag accommodating the hygroscopic agent and the deliquescent of the hygroscopic agent A double bag with an outer bag for storing water, the opening of the upper surface of the double bag is sealed with a microporous film, and the outer container and the inner container are firmly fixed to each other. A hygroscopic material is formed between the opening end and the microporous film of the middle container, and as a method for producing this hygroscopic agent, an outer container having an upper opening and an opening end of the outer container. The deliquescent hygroscopic agent is stored inside the outer container so that it adheres to and seals the outer container. A hygroscopic material composed of an inner container, wherein the inner container is a double bag having a porous inner bag containing a hygroscopic agent and an outer bag containing water generated by deliquescent of the hygroscopic agent, The upper opening of the double bag is formed by sealing it with a microporous film, and the outer container and the inner container are fixed to each other between the opening end of the outer container and the microporous film of the middle container. A method of manufacturing a hygroscopic material according to claim 1, wherein the inner container is a cylindrical bag having one end opened and the other end is hermetically sealed, and a hole having a diameter of 0.1 to 2.0 mm is formed on the sealed end side of the bag. A microporous film sealing step in which the opening end of the bag is folded back and expanded until the opening end is located below the sealing end, a hygroscopic agent is stored inside, and the folded end is sealed with a microporous film;
A sealing step of sealingly welding the open ends to form a double bag;
A fixing step of fixing the outer container and the inner container by fixing the open end of the outer container and the microporous film of the middle container;
The method for producing a hygroscopic material produced in each of the above steps.

[0006]

The hygroscopic material of the present invention is a double bag in which the inner container has a porous inner bag for containing the hygroscopic agent and an outer bag for containing water generated by the deliquescent of the hygroscopic agent. A hygroscopic material formed by sealing the opening on the upper surface with a microporous film and fixing the outer container and the inner container between the opening end of the outer container and the microporous film of the middle container. Because,
At the time of disposal after use, the product can be compactly folded and disposed of, and the product is not bulky and is environmentally friendly. In particular, by configuring the outer container with a paper can, it is possible to minimize the amount of plastic used, and by using paper that is environmentally friendly, the problem of waste disposal can be cleared. It is possible.

Further, in the manufacturing method of the present invention, the inner container is a cylindrical bag having one end opening, and the other end is hermetically sealed, and a hole having a diameter of 0.1 to 2.0 mm is formed on the sealed end side of the bag. Punching step: Microporous film in which the opening end of the bag is folded back and expanded until the opening end is located below the sealing end, a hygroscopic agent is stored inside, and the folded end is sealed with a microporous film. Sealing step; Sealing step for sealing and welding the open end to form a double bag; Fixing for fixing the outer container and the inner container by fixing the open end of the outer container and the microporous film of the inner container Since the method for producing the hygroscopic material produced by each of the steps of the step; is employed, the hygroscopic material of the present invention can be produced extremely easily and easily.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the moisture absorbent material of the present invention will be described with reference to the drawings. The moisture absorbent 1 is composed of an inner container 2, an outer container 3, and a barrier film 4 for sealing the upper surface of the inner container 2.
The inner container 2 comprises an inner bag 6 and an outer bag 7 arranged outside the double bag 5, and the upper end of the double bag 5 is sealed with a microporous film 8. The inner bag 6 is made of a porous film and contains a deliquescent hygroscopic agent 9 therein. The pore size of this porous film is 0.1 to 2.0 m, though it depends on the particle size of the hygroscopic agent 9 stored inside.
m is preferred. If the pore size is smaller than 0.1 mm, the water generated by deliquescent does not efficiently drop into the outer bag 7, and if the pore size exceeds 2.0 mm and becomes large, the moisture absorbent 9 drops into the outer bag 7 before it absorbs moisture. Resulting in.

The inner bag 6 and the outer bag 7 are preferably made of high-strength flexible films such as high-density polyethylene, low-pressure normal low-density polyethylene, polypropylene, propylene-ethylene copolymer, and polyamide resin. is there.

The microporous film 8 for sealing the opening on the upper surface of the double bag 5 is made of polyolefin resin such as high density polyethylene, medium and low density polyethylene, polypropylene, polyamide resin, polyvinyl chloride resin or the like physically or chemically. Is treated to form fine holes of 0.1 to 10 μm. The microporous film 8 is 0.1-10.
Since it has minute pores of μm, water cannot pass through even if moisture or air passes through. When the moisture in the air becomes water due to deliquescent, the water is no longer microporous film 8.
Cannot be passed through and is sealed in the middle container 2.

The outer container 3 is composed of a paper can having a cup-shaped opening at the upper end, and has a flange portion that extends outward at the upper end thereof. A paper can is a kraft paper laminated with a hydrophobic plastic film such as high-pressure low-density polyethylene.To further increase water resistance, the kraft paper has a sizing agent such as pine resin size or petroleum resin as a sizing agent. Sizes and wax sizes are sometimes blended together with aluminum sulfate or the like, and when the size alone is insufficient, a waterproofing agent such as urea resin, melamine resin or polyamide resin is internally added. As the plastic film for coating the inner surface of the paper can, in addition to the high-pressure low-density polyethylene described above, linear low-density polyethylene, high-density polyethylene, ethylene vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid Copolymer,
A polyethylene-based hydrophobic resin having a melting point of 120 ° C. or less, such as an ethylene-methacrylic acid copolymer and an ionomer obtained by crosslinking these metal ions, is suitable. This kraft paper preferably has a basis weight of 100 to 600 g / cm ² , and more preferably 200 to 400 g / cm ² . The microporous film 8 at the upper end of the inner container 2 for sealing the inner container 2 is provided with an edge portion 10 that extends further outside than the welded portion with the upper end of the double bag 5, and the open end of the outer container 3 Portion 11 and edge portion 10 of the microporous film 8 of the middle container 2
And are welded together. This welding can be performed more completely by using the same plastic as the film laminated on the inner surface of the paper can and the microporous film 8.

The upper end of the microporous film 8 is sealed with a barrier film. The barrier film is an oxygen barrier film or aluminum foil made of oxygen barrier plastic. Oxygen barrier plastics have an oxygen transmission coefficient of 1 × 10 ^-10 cccm / sec
-A plastic made of a resin having a cmHg (37 ° C, RH 0%) or less, for example, a saponified ethylene-vinyl acetate copolymer resin, a polyamide resin such as nylon,
It comprises a polyvinyl alcohol resin, a polyester resin such as polyethylene terephthalate, a vinylidene resin such as polyvinylidene chloride, and a modified product or mixture thereof. The oxygen barrier film 5 preferably has a laminated structure of the above-mentioned oxygen barrier plastic layer and another plastic. Other plastics include high-density, medium-density or low-density polyethylene, vinyl acetate, acrylate, or polyethylene copolymerized with butene, hexene, 4-methyl-1 pentene and other α-olefins, ionomer resins, polypropylene. Homopolymer, polypropylene graft-copolymerized with ethylene, or ethylene, butene, hexene,
Polyolefin copolymerized with α-olefins such as 4-methyl-1 pentene, poly-1-butene, poly 4-methyl-1-pentene and the like are generally called polyolefin resins. It is preferable to dispose it because the heat sealing property becomes good. In particular, by using a material having an easy-opening function, for example, a material in which different types of polyolefin resins such as high-density polyethylene and polypropylene are blended to slightly reduce the compatibility of the resin itself, peeling property of the seal interface can be improved. It can be improved and can be easily peeled off during use to obtain a product with high commercial value.

The microporous film and the barrier film are hermetically sealed by welding, and it is particularly preferable that the welding is a welding having an easy opening property. As the easy-opening means, conventionally known means such as a method of blending two kinds of different kinds of plastics as an intervening plastic to cause phase separation is used.

The hygroscopic agent 9 is a deliquescent substance such as calcium chloride, magnesium chloride or lithium chloride, and calcium chloride is particularly preferable in terms of hygroscopic capacity, price and nontoxicity. In addition to the deliquescent substance described above, the hygroscopic agent 9 may be another hygroscopic substance, for example, a polymer having a three-dimensional network structure having a hydrophilic group generally called a superabsorbent polymer or a synthetic unstable form. You may use together silica, calcium silicate, perlite, anhydrite, zeolite, silica gel, quick lime, etc.

The hygroscopic material 1 is used by removing the barrier film and exposing the microporous film 8 at the time of use. Moisture in the air passes through the microporous film 8 into the inner container 2 and comes into contact with the moisture absorbent 9 inside. Moisture in the air deliquesces the hygroscopic agent 9 and precipitates the moisture as water. The precipitated water passes through the holes of the inner bag 6 having a diameter of 0.1 to 2.0 mm and falls, and is collected in the outer bag 7. The capacity inside the outer bag 7 is set to be larger than at least the amount of the moisture absorbent 9 deposited in the inner bag 6 due to the relationship with the amount of the moisture absorbent 9. When the hygroscopic agent 9 is used up and is discarded, the microporous film 8 is broken, the water inside is thrown away, the outer container 3 is pressed from the outside to reduce the weight to a flat shape, and then discarded.

Next, one embodiment of the method for producing a moisture absorbent of the present invention will be described with reference to the drawings. The manufacturing process of the hygroscopic material 1 includes a perforating process, a microporous film sealing process, a sealing process, and a fixing process. Hereinafter, description will be made step by step.

Punching step: As shown in FIG. 2, a hole 17 is made on the side of the sealed end 16 of the bag 15 made of a plastic film having one end open and the other end sealed. This plastic film is a plastic film having the above-mentioned strength and flexibility. The diameter of the hole 17 is 0.1 to
It is 2.0 mm, and water that passes through this portion and that is slightly smaller than the smallest particle diameter of the hygroscopic agent 9 stored inside is used. If the number of the holes 17 is too large, water can pass through well, but when the holes 17 are transported with the hygroscopic agent 9 accommodated therein, the hygroscopic agent 9 breaks due to its own weight, and conversely, if too small. However, moisture is not sufficiently passed, and considering these, 1 to 20 per 1 cm ² is preferable. In this perforation step, punching with a blade, perforation with a heating blade or laser, and electric energy can be performed.

Microporous film sealing step; then FIG.
Inside the jig 18 including the cylindrical portion 18a shown in FIG.
Insert the sealed end 16 of 5. At this time, the cylindrical portion 19 of the jig 18 is configured so that the perforated portion formed in the previous punching step is hidden inside the jig 18. Next, the opening end 17 of the bag 15 is folded back and unfolded, the opening side end 20 of the cylindrical portion 19 of the jig 18 is hidden, and the opening side end 20 of the jig 18 contacts the side surface of the folded bag. To do so. And
The microporous film 8 is brought into contact with this side surface, and the side surface of the folded bag and the microporous film 8 are sandwiched between the ultrasonic horn 21 and the opening side end 20 of the jig 18. In this state, ultrasonic waves are applied and fixed to the ultrasonic horn 21 to form the inner container 2. This ultrasonic wave preferably has a frequency of 5 to 50 KHz.

Sealing process: Open end 17 of the bag 15
Are welded and sealed to form a double bag 5. This welding is
Conventionally known welding means can be used, but high frequency hot plate welding is preferable in terms of reliability and workability.

Fixing step: Flange portion 11 formed at the open end of a paper can whose inner surface is coated with high-pressure low-density polyethylene
And the edge portion 10 of the microporous film 8 formed on the upper end of the inner container 2 are brought into contact with each other with a jig and are welded and fixed. In order to complete this fixing, it is preferable to use the microporous film 8 made of polyethylene plastic. Since polyethylene-based plastic has a small dielectric loss, high-frequency dielectric heating cannot be efficiently performed. Therefore, this welding can be performed by utilizing hot plate welding, hot air welding, or ultrasonic welding.

In the above embodiment, the flange 11 is formed at the open end of the outer container 3 and the flange 11 and the edge 10 of the microporous film 8 of the middle container 2 are welded together. The invention is not limited to this, and the outer container 3
It is also possible to directly weld to the opening end without forming a flange at the opening end.

By the way, although the double bag 5 is formed by folding the bag 11 in the above embodiment, the micro bag 8 has a plurality of holes each having a diameter of 0.1 to 2.0 mm. May be directly fixed to form the inner bag 6, and the outer bag 7 larger than the porous bag may be fixed to the outer side thereof to form the double bag 5. According to this manufacturing method, since the materials of the inner bag 6 and the outer bag 7 can be changed, it is possible to select a suitable material.

In the above embodiment, the microporous film and the bag are fixed to each other by ultrasonic welding, but a welding method such as hot plate welding, high frequency welding or hot air welding can be used. In particular, in the case of high frequency welding, induction heating and dielectric heating can be selectively used depending on the materials of the holding frame member and the bag to be welded. In the case of a polyamide resin, polyvinyl chloride, or polyester resin having a large dielectric loss coefficient, the resin itself can be directly heated from the inside by dielectric heating, so that heat welding can be performed efficiently. Further, in the case of induction heating utilizing electromagnetic induction, a high frequency is applied to a magnetic material such as iron to heat the magnetic material, and the heated magnetic material is heated and welded by bringing it into contact with or in proximity to the welding surface. Therefore, it can be widely used regardless of the material to be welded. At this time, as the high frequency,
Those of 50 KHz to 3 MHz can be efficiently heated.

[0024]

The hygroscopic material of the present invention is a double bag in which the inner container has a porous inner bag for containing the hygroscopic agent and an outer bag for containing water generated by the deliquescent of the hygroscopic agent. The opening on the upper surface of the bag was formed by sealing with a microporous film, and the outer container and the inner container were fixed to each other between the opening end of the outer container and the microporous film of the middle container. Since it is a hygroscopic material, it can be compactly folded and discarded at the time of disposal after use, so that it can be a product that is not bulky and is environmentally friendly.

In particular, by constructing the outer container from a paper can, the amount of plastic used can be minimized, and the use of environmentally friendly paper makes the problem of waste disposal clear. Is what you can do.

Further, in the manufacturing method of the present invention, the inner container is a cylindrical bag having one end opening, and the other end is hermetically sealed, and a hole having a diameter of 0.1 to 2.0 mm is formed on the sealed end side of the bag. Punching step: Microporous film in which the opening end of the bag is folded back and expanded until the opening end is located below the sealing end, a hygroscopic agent is stored inside, and the folded end is sealed with a microporous film. Sealing step; Sealing step for sealing and welding the open end to form a double bag; Fixing for fixing the outer container and the inner container by fixing the open end of the outer container and the microporous film of the inner container Since the method for producing the hygroscopic material produced by each of the steps of the step; is employed, the hygroscopic material of the present invention can be produced extremely easily and easily.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view illustrating a hygroscopic material of the present invention.

FIG. 2 is a perspective view illustrating a punching process of an example.

FIG. 3 is a perspective view of a jig used for welding.

FIG. 4 is a cutaway perspective view during ultrasonic welding.

[Explanation of symbols]

 1 Hygroscopic Material 2 Medium Container 3 Outer Container 4 Barrier Film 5 Double Bag 6 Inner Bag 7 Outer Bag 8 Microporous Film 9 Hygroscopic Agent 10 Edge 11 Flange 15 Bag 16 Sealed End 17 Hole 18 Jig 19 Cylindrical Section 20 Opening End 21 Ultrasonic Horn

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Fukushima Aizuko 2-25-2 Nakakasai, Edogawa-ku, Tokyo

Claims (10)

[Claims] 1. An outer container having an upper surface opening, and an inner container for accommodating a deliquescent hygroscopic agent inside the outer container so as to seal the outer container by being fixed to the opening end of the outer container. In the hygroscopic material constituted by, the inner container is a double bag including a porous inner bag for containing the hygroscopic agent and an outer bag for containing water generated by deliquescent of the hygroscopic agent, and the upper surface of the double bag. The opening of the is sealed by a microporous film, and the outer container and the inner container are fixed to each other between the opening end of the outer container and the microporous film of the middle container. Hygroscopic material. 2. The pore diameter of the porous inner bag is 0.1 to 2.0.
The hygroscopic material according to claim 1, wherein the hygroscopic material is mm. 3. The moisture absorbent material according to claim 1, wherein the outer container is a paper can. 4. The moisture absorbent according to claim 3, wherein the outer container is composed of a paper can whose inner surface is coated with a hydrophobic resin having a melting point of 120 ° C. or less. 5. The moisture absorbent according to claim 1, wherein the upper surface of the microporous film is sealed with a resin film having a high oxygen barrier property or an aluminum foil. 6. The upper surface of the microporous film is hermetically sealed by a resin film having a high oxygen barrier property or an aluminum foil in an easily openable state.
The hygroscopic material described. 7. An outer container having an upper surface opening, and an inner container containing a deliquescent hygroscopic agent inside the outer container so as to seal the outer container by being fixed to the opening end of the outer container. A double bag comprising a porous inner bag for storing a hygroscopic agent and an outer bag for storing water generated by the deliquescent of the hygroscopic agent, A hygroscopic material that is formed by sealing the opening of the upper surface of the container with a microporous film and that secures the outer container and the inner container between the opening end of the outer container and the microporous film of the middle container. In the manufacturing method described above, a perforating step in which the other end of a cylindrical bag having one end opening is sealed and a hole having a diameter of 0.1 to 2.0 mm is bored on the sealed end side of the bag; Fold and open the open end of the bag until it is located below the sealed end, store the moisture absorbent inside, and slightly add the folded end. Microporous film sealing step of sealing with a flexible film; sealing step of sealingly welding the open end to form a double bag; by fixing the open end of the outer container and the microporous film of the inner container A method of manufacturing a hygroscopic material, characterized by being manufactured by each step of a fixing step of fixing an outer container and an inner container. 8. The method for producing a hygroscopic material according to claim 7, wherein the fixing step is performed by ultrasonic welding in which ultrasonic waves having a frequency of 5 to 50 KHz are used. 9. The method for producing a hygroscopic material according to claim 7, wherein the fixing step is performed by high frequency welding by high frequency dielectric heating. 10. The fixing step is characterized in that the magnetic body is heated by electromagnetic induction heating with a high frequency of 50 KHz to 3 MHz, and the heated magnetic body is brought into proximity or contact to heat and fix the magnetic body. A method for producing the moisture absorbent according to the item.