JPH0321322A - Dehumidifying package - Google Patents

Abstract

PURPOSE:To facilitate the automation of a manufacturing process by bonding a moisture absorbing agent to the adhesive layer formed to a water absorbable sheet-like material by applying an adhesive to the material to form a moisture absorbing body and sealing the body in a package wherein a part is moisture- permeable. CONSTITUTION:A powdery and/granular moisture absorbent P (e.g. calcium chloride) is spread on and fixed to the adhesive layer 6 intermittently applied to the surface of the water absorbable sheet like material 2 constituting a moisture absorbing body A. At least a part of the package 3 in which the moisture absorbing body A is sealed is constituted of a moisture permeable and water impermeable sheet-like material 4. This sheet-like material is constituted of a nonwoven fabric obtained by forming hydrophobic fibers composed of a thermoplastic polymer such as polyethylene into a sheet and bonding the fibers mutually at high temp. under high pressure. As a result, the automation of a manufacturing process becomes easy and the thickness of the moisture absorbent to be sealed is made easy to uniformize and the irregularity of moisture absorbing velocity can be made as low as possible.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a dehumidifying package, and more particularly to a dehumidifying package in which a moisture absorbent is encapsulated.

(Conventional technology) In order to prevent rusting and deterioration due to moisture absorption of precision parts, foods, medicines, etc. that are packaged and packaged, a dehumidifying package containing a moisture absorbing agent such as silica gel or quicklime is packed. , added during packaging.

Such dehumidifying packaging has conventionally been made from filter paper or the like in a single-layer bag, and during use, the hygroscopic agent enclosed may ooze out onto the surface of the packaging, or the hygroscopic agent may The silica gel and quicklime that are used as such have a slow moisture absorption rate and a small amount of moisture absorption per unit weight, so they have the disadvantage that they must be used in large quantities.

Furthermore, when quicklime is used as a moisture absorbent, it also has the disadvantage that the lime generates heat due to moisture absorption.

Compared to such quicklime and silica gel, deliquescent moisture absorbents such as calcium chloride and magnesium chloride absorb moisture at a faster rate and absorb a larger amount of moisture per unit weight.
The amount of moisture absorbent used is small, and it can be used in a layered manner by impregnating paper or nonwoven fabric.

However, when these deliquescent hygroscopic agents are sealed in a single-layered bag from a water-permeable sheet material such as filter paper, the liquefied hygroscopic agent oozes out from the surface of the bag and becomes unpacked. This may cause deterioration of products such as precision parts, or may cause rust.

In order to overcome these drawbacks, Japanese Utility Model Application Publication No. 17323/1983 discloses a single-layered bag made of moisture-permeable but water-impermeable non-woven fabric, in which a sheet-like body impregnated with calcium chloride, etc. is enclosed. Dehumidifying packaging has been proposed.

In such a dehumidifying package, micropores formed in the thickness direction of the nonwoven fabric used intersect in a complicated manner,
Although gases such as water vapor (humidity) can pass through nonwoven fabrics,
Since liquids such as water droplets cannot easily pass through a nonwoven fabric, even if a deliquescent moisture absorbent is used, it is possible to prevent the moisture absorbent that has become liquid due to moisture absorption from seeping out.

However, in order to manufacture a layered body impregnated with a moisture absorbent such as calcium chloride, it is necessary to immerse the sheet in a solution in which the moisture absorbent such as calcium chloride is dissolved, and then dry it. However, it is extremely difficult to automate the manufacturing process of dehumidifying packaging.

For this reason, the inventor attempted to make the dehumidifying package into a double bag, fill the inner bag with a powdered moisture absorbent, and then seal it in the outer bag, but the operations such as measuring and filling the moisture absorbent It tends to be difficult to easily automate the manufacturing process because of the need for It was also found that variations in moisture absorption rate, etc. tend to occur.

Therefore, the purpose of the present invention is to use a powdered and/or granular moisture absorbent, to facilitate automation of the manufacturing process, to make the thickness of the enclosed moisture absorbent uniform, and to minimize variations in dehumidification speed, etc. The object of the present invention is to provide a dehumidifying package that can be made smaller.

(Means for Solving the Problem) As a result of repeated studies to achieve the above object, the inventor has found that
By encapsulating a moisture absorbent obtained by adhering a moisture absorbent to an adhesive layer formed by applying an adhesive to a water absorbent sheet in a package, operations such as measuring the moisture absorbent can be made unnecessary. The present inventors have discovered that the manufacturing process can be easily automated, and that the moisture absorbent can be evenly spread on the sheet-shaped body enclosed in the package, and have arrived at the present invention.

That is, the present invention provides a package in which a moisture absorbent is enclosed, in which a powdery and/or granular adhesive layer is intermittently applied to the surface of a water absorbent sheet constituting the moisture absorbent. A dehumidifying package is provided, wherein a moisture absorbent is spread, and at least a part of the package in which the moisture absorbent is enclosed is constituted by a moisture permeable and water impermeable sheet. .

In the present invention, another sheet-like body is bonded to the surface of the water-absorbing sheet-like body on which the moisture-absorbing agent is spread, with the moisture-absorbing agent interposed therebetween, or the moisture-absorbing agent of the water-absorbing sheet-like body is If the dehumidifying package is left indoors, it is important to note that another water-absorbent sheet material, on which the moisture absorbent is spread, is bonded to the surface where the moisture absorbent is spread, with the surface on which the moisture absorbent is spread on the inside. Even if the moisture absorbing agent absorbs moisture rapidly in a very short period of time, the dehumidifying package can be enclosed in the packaging of the product while maintaining sufficient moisture absorption capacity without reducing the moisture absorption capacity.

(Function) According to the dehumidifying package of the present invention, the amount of the moisture absorbent spread can be adjusted by adjusting the area of the adhesive applied to the sheet-like body. Since a series of operations can be made unnecessary, the manufacturing process can be easily automated.

Moreover, since the moisture absorbent can be uniformly spread over the sheet-like body, variations in moisture absorption rate between dehumidifying packages can be minimized.

Furthermore, even if the moisture absorbent becomes liquid (water) due to deliquescence due to moisture absorption, the water will be absorbed into the water absorbent sheet from the non-coated parts of the adhesive, so the moisture absorbent will always come into contact with water vapor. Therefore, the moisture absorption rate of the dehumidifying package can be maintained at approximately the same level even during use as at the beginning of use.

Furthermore, the water absorbed by the sheet-like body does not easily seep out to the outside of the package, making it possible to maintain the dry state of the product.

(Example) The present invention will be explained in more detail using the drawings.

FIG. 1 is a sectional view showing an embodiment of the dehumidifying package of the present invention.

In FIG. 1, a moisture absorbent A enclosed in a package 3 is composed of a moisture absorbent 1 made of powdered calcium chloride and a filter 2 in the form of a water absorbent sheet.

As shown in FIG. 2, the particles P of the moisture absorbent l are spread on an adhesive N (hereinafter sometimes referred to as an adhesive layer) 6, which is formed by applying an adhesive on a filter 1. ing.

The adhesive layer 6 is intermittently provided with non-applied parts 7 of adhesive, and the non-applied parts 7 are parts where the moisture absorbent particles P are not adhered and the surface of the filter 2 is exposed. It is.

FIG. 2 is a partially enlarged cross-sectional view of the filter paper 2 constituting the moisture absorbent A, and the uncoated portion 7 is sufficient to have the size of a bottle hole, and the individual sizes and positions on the filter paper 2 are also random. It is set in.

The adhesive layer 6 having such non-applied portions 7 intermittently can be easily formed by spraying adhesive particles onto the filter paper 2 and then heating the filter paper 2 to foam the adhesive particles.

The adhesive used in this case may be one that dissolves in water that absorbs moisture, and in the case of dehumidifying packaging to be enclosed in food packaging, adhesives made of starch, etc. are preferable. .

The hygroscopic body A is formed by stacking two filter papers 2 on which such a hygroscopic agent is spread, and the two sheets of filter paper 2 bond the surfaces on which the hygroscopic particles P are spread inside each other. This is what is being done.

Such joining of the two filters 2 can be easily performed by pressing them together with a roller or the like with the spread surface of the moisture absorbent particles P facing inside.

The package 3 in which the moisture absorbent A is enclosed is composed of a moisture permeable part 4 made of a moisture permeable and non-water permeable non-woven fabric, and a certain transparent part 5 made of a moisture impermeable transparent film.

The moisture-permeable part 4 is a nonwoven fabric obtained by forming a sheet of rough water-based fibers made from a thermoplastic polymer such as polyethylene or polypropycin, and then bonding the fibers together at high temperature and high pressure.

Micropores intersect in a complicated manner in the thickness direction of this nonwoven fabric, and although gases such as water vapor can pass therethrough, liquids such as water cannot easily pass therethrough.

In addition, such a nonwoven fabric has moisture permeability (JISL-109
9 CaCf (measured by g method) is 5500-7000g
/rd/24HR (especially preferably 6300 to 69
0h/rri/24Hr) and water pressure resistant (JIS
L-1092 (measured by high water pressure method) is 1200 to 250
0 nm HgO (particularly preferably 1700 to 1500
n+m HJ) is preferable.

Moreover, the transparent part 5 is a transparent film obtained by melting polyethylene, polypropylene, or the like into a gJ film.

Since both the moisture permeable portion 4 and the transparent portion 5 are made of a thermoplastic polymer, they can be easily formed into a bag shape by heat sealing the ends of both, and the nonwoven fabric of the moisture permeable portion 5 Because the surface is smooth, patterns, letters, etc. can be printed in multiple colors.

When the filter 2 constituting the hygroscopic body A is colored in a light color,
As the filter paper 2 absorbs water, the color tone changes from light to dark, so the degree of water absorption of the filter paper 2 can be observed through the transparent portion 5 of the package 3.

Moreover, on the surface of the filter paper 2 corresponding to the transparent part 5 of the package 3,
Even if an indicator obtained by impregnating paper or the like with a cobalt chloride solution and drying it is pasted or printed on the surface (inner surface) of the transparent part 5 on the moisture absorbing body A side with an ink containing cobalt chloride, the filter paper 2 The degree of water absorption can be observed.

In this way, by providing the water absorption display means on the filter paper 2 and the transparent part 5 that allow the degree of water absorption of the filter paper 2 to be observed from the outside of the package 3, it is possible to judge the moisture absorption capacity of the dehumidifying package and when to replace it. can.

Note that the filter paper 2 may be any material as long as it has water absorbency; for example, a nonwoven fabric that has larger micropores than the nonwoven fabric used for the packaging body 3 and is moisture permeable and water permeable can also be used.

The moisture absorbent 1 adhered to such a filter 2 may be granular calcium chloride instead of the powdered calcium chloride used in this example, and powdered and granular calcium chloride may be used. It may be a mixture.

Moreover, magnesium chloride can also be used in place of calcium chloride.

Furthermore, as the moisture absorbent 1, a powdery resin obtained by graft polymerizing a water-absorbing resin such as corn starch and acrylonitrile and hydrolyzing it with sodium hydroxide, particularly preferably a powdery material of the above resin and a powdery material. Mixtures with calcium chloride etc. can also be used.

The moisture absorbent 1 may contain a deodorant, a fungicide, an aromatic, and the like.

In order to manufacture the dehumidifying package of this embodiment, first, a powder is applied to the filter paper 2, which has been coated with an adhesive and intermittently has an adhesive layer 6 having non-applied areas 7. The filter paper 2 on which a predetermined amount of calcium chloride is evenly spread is prepared by sprinkling calcium chloride to spread the calcium chloride particles P on the adhesive layer 6, and then removing excess calcium chloride with a brush or the like. obtain.

Next, the moisture absorbent A obtained by joining the two sheets of the filter 2 with the side on which calcium chloride is spread on the inside,
A certain moisture permeable portion 4 is made of a moisture permeable non-woven fabric and is sealed in advance into a bag-shaped package 3 by heat sealing or the like.

In this way, when manufacturing the dehumidifying package of this embodiment, the manufacturing process can be easily automated without requiring operations such as measuring the moisture absorbent 1 and filling the bag.

Next, the heat absorbing effect of the dehumidifying package according to this example will be explained.

Water vapor (humidity) outside the dehumidifying package passes through the moisture permeable part 4 of the package 3 and the non-applied part 7 of the filter paper 2, and passes through the heat absorbing agent spread on the adhesive layer 6 on the filter paper 2. Absorbed by particles P.

Calcium chloride, which is used as the moisture absorbent 1 in the dehumidifying package of this example, deliquesces and becomes liquid (water) due to moisture absorption, but since this water is absorbed into the filter paper 2 from the non-applied area 7, the moisture absorbent Particles P can always come into contact with water vapor,
The moisture absorption rate at the beginning of use and the moisture absorption rate during use can be made approximately the same.

Furthermore, the moisture absorbent A enclosed in the dehumidifying package of this example
Since the two filters 2 are joined with the surfaces on which the moisture absorbent particles P are spread on the inside, warm air flows through the moisture permeable part 4.
When passing through the non-applied portion 7 of the filter 2, it is subjected to a relatively large passage resistance, and the amount of moisture that reaches the moisture absorbent 1 and is absorbed at the same time is limited.

Therefore, even if the dehumidifying package according to this embodiment is left in a room where there is a large amount of moisture, a large amount of moisture will not be suddenly absorbed by the moisture absorbent 1, so the moisture absorption capacity of the moisture absorbent 1 There is no significant decrease in

In addition, as in the packaging of products such as precision parts and foods, the passage resistance of the moisture permeable part 4 and the non-coated part 7 is extremely small for a relatively small amount of moisture, and the moisture is easily absorbed by the moisture absorbent l. .

When a deliquescent hygroscopic agent such as calcium chloride is used as in this embodiment, the hygroscopic agent I gradually turns into water due to moisture absorption and permeates into the water-absorbent filter paper 2 as described above. The amount of water absorbed in the transparent part 5 of the package
It is displayed by a water absorption display means provided on the inner surface of the filter paper 2 or on the filter paper 2 corresponding to the transparent part 5, and is observed from the outside of the package 3.

In other words, if the filter paper 2 is lightly colored, the extent to which it changes to a dark color, or if paper etc. obtained by impregnating and drying cobalt chloride is attached to the filter paper 2, or if cobalt chloride is If the contained ink is printed on the inner surface of the transparent part 5, the amount of water absorbed by the filter 2 can be determined by observing the degree of discoloration of cobalt chloride from blue to red. be able to.

The water absorbed by the filter paper 2 in this way is absorbed by the transparent part 5 of the package 3.
Needless to say, since the moisture permeable portion 4 is also non-water permeable, substantially all of the moisture absorbed by the moisture absorbent 1 is retained within the package 3 without seeping out onto the surface of the package 3.

Therefore, the moisture absorbed by the moisture absorbent I does not turn into water and come out of the package 3 again, so products such as precision parts and foods can be kept in a dry state.

In the dehumidifier package of this embodiment, if it is desired to further increase the rate of moisture absorption, the moisture permeable non-woven fabric constituting the moisture permeable part 4 may be used instead of forming the transparent part 5. This is possible by shaping the entire package 3.

Further, the dehumidifying package according to this embodiment that has absorbed moisture can be recycled by heating it in a microwave oven or the like.

The dehumidifying package according to this example is preferably stored by being sealed in a moisture-impermeable package.

The moisture absorbent material A used in the embodiments described above is made by joining two water absorbent sheet-like materials with the surfaces on which the moisture absorbent is spread on the inside. Using a water-absorbing sheet-like material obtained by spreading a moisture-absorbing agent as one of the sheet-like materials, the other sheet-like material is applied to the moisture-absorbing agent-spreading surface of the water-absorbing sheet-like material without spreading the moisture-absorbing agent. A moisture absorbent obtained by joining bodies may also be used.

The other sheet-like body may be any sheet-like body, and may be a moisture-impermeable sheet-like body.

Of course, the other sheet-like body may be a water-absorbing sheet-like body.

Furthermore, instead of the nonwoven fabric in the i3 wet section 4, a sheet-like body may be used in which a moisture permeable and non-water permeable porous film is laminated on a normal transparent/water permeable nonwoven fabric. The water impermeability of such laminated non-sheets is better than the non-woven fabric used in the previous examples.

Incidentally, the moisture permeability of the ξ lanate sheet-like body is comparable to that of the nonwoven fabric used in the above embodiment.

(Effects of the Invention) According to the dehumidifying package of the present invention, there is extremely little variation in moisture absorption rate, etc., and the manufacturing process of the dehumidifying package can be easily automated. Since it does not seep out of the package as water again, it can be suitably used for dehumidification during packaging of precision parts, foods, medicines, etc. that are sensitive to moisture.

Moreover, even if the dehumidifier package is not packaged together with products such as precision parts, and the dehumidifier package is removed from the storage package and left indoors, the moisture absorbing ability of the desiccant will not suddenly decrease and the moisture absorption capacity will be sufficient. It can be packaged with products while retaining its moisture absorption ability.

For this reason, it is not necessary to strictly control the time the dehumidifier package is left indoors, so it is also possible to simplify the packaging work.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a dehumidifying package showing an embodiment of the present invention;
and FIG. 2 are partially enlarged sectional views of the filter 2 constituting the moisture absorbent body A shown in FIG. 1. In the figure, A... Moisture absorbent, P... Moisture absorbent particles, 1... Moisture absorbent, 2... Inner bag, 3... Packaging body, 4... Permeable and non-water permeable. non-woven fabric, 5...non-M
'll=sexual transparent film. 6... Adhesive layer, 7... Part where adhesive is not applied.

Claims (1)

[Claims] 1. The smell of the package containing the moisture absorbent and a water absorbent sheet forming the moisture absorbent body. Adhesive that is applied intermittently to the surface of the body Powdered and/or granular moisture absorbent is spread on the layer. and the moisture absorbent is encapsulated. At least a portion of the package is moisture permeable and Consists of a non-water permeable sheet material A dehumidifying package characterized by: 2. The moisture-absorbing agent in the water-absorbing sheet is spread. Place another sheet with the moisture absorbent on the surface Claim 1, wherein the shaped bodies are joined. dehumidifying packaging. 3. The moisture absorbent in the form of a water absorbent sheet is spread. A moisture absorbent is spread on the surface of the The water-absorbent sheet material spreads the moisture absorbent on the surface. Claim 1, which is joined on the inside Or the dehumidifying package according to item 2.