JP2000168846A - Deoxidizing agent-packaging bag with humidity indicator attached thereto - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably manufacture a deoxidizing agent-packaging bag with a humidity indicator by attaching a humidity indicator label to a surface of the deoxidizing agent packaging bag to easily judge the humidity in a sealed container and specifying the tensile strength of the humidity indicator label and a peelable paper. SOLUTION: Since a metal and an electronic material are corroded with oxygen and water, they are sealed and preserved by sealing a humidity indicator together with a deoxidizing agent and a dehumidifying agent. A humidity indicator label is attached to the surface to form a deoxidizing agent packaging bag and the humidity is easily judged. The tensile strength of the humidity indicator label is set to be not less than 1 kgf with the width of 15 mm, and the tensile strength of a peelable paper is set to be not less than 1 kgf with the width of 15 mm, respectively. The humidity indicator label is a pressure sensitive adhesive label to adhere the adhesive agent by applying the pressure, and a substance to be discolored by absorbing the humidity is impregnated and coated on a base material on which the adhesive agent is coated, and the peelable paper is attached thereto.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a function of absorbing oxygen, inorganic gas / organic gas, moisture, etc.
Used for preserving electronic components, electrical components, precision components, magnetic and optical components, jewelry, weapons, aircraft, automobiles, glass, rubber products, photographic films, food, pharmaceuticals, pressed flowers, paintings, ancient documents, excavated items, etc. Oxygen absorber packaging bag to be used.

[0002]

2. Description of the Related Art Metals and electronic materials are corroded by oxygen and moisture, so that they are often sealed and stored with an oxygen scavenger or a dehumidifier. Until now, the humidity indicator was enclosed so that the moisture absorption capacity of the desiccant could be visually determined to be saturated, but the humidity indicator was replaced with a deoxidizer,
Since it was placed separately from the dehumidifier packaging bag, there was a problem that the packaging process became complicated. Further, in the case of using a deoxidizing substance such as iron powder which requires moisture for oxygen absorption, if the humidity is lower than 60% RH, the deoxidizing rate becomes extremely slow or the deoxidizing reaction is stopped, and the sealing is performed. Oxygen cannot be completely removed from the container. Therefore, it has been proposed to enclose a humidity indicator to check whether the inside of the sealed container has a sufficiently high humidity. However, the problem of complicating the packaging process has been serious and has not been implemented. In addition, some preserved items, such as cultural properties, are required to be oxygen-free and at the same time have constant humidity, and it is suggested to enclose a humidity indicator to check the humidity. ,
Here, too, there was a problem that the packaging process became complicated.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide an oxygen-absorbing agent packaging bag provided with a humidity indicating function in order to solve the above-mentioned problems.

[0004]

Means for Solving the Problems In order to achieve the above object, the inventors have found that a humidity indicator label is attached to the surface of an oxygen scavenger packaging bag so that the humidity in a sealed container can be determined. In addition, when the strength of the humidity indicator label and the strength of the release paper were studied diligently, the strength of the humidity indicator label was 1 kgf at a width of 15 mm.
As described above, it has been found that a strength of the release paper of 15 mm width and 1 kgf or more is suitable for manufacturing a stable oxygen indicator-attached oxygen absorber packaging bag.

That is, the present invention relates to an oxygen-absorbing agent packaging bag characterized in that a humidity indicator label is attached to the surface thereof, wherein the humidity indicator label has a tensile strength of 15%.
An oxygen-absorbing agent packaging bag, wherein the tensile strength of release paper used for a humidity indicator label is 1 kgf or more when the width is 1 mmf or more.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The humidity indicator label used in the present invention is a pressure-sensitive adhesive label to which an adhesive is adhered by pressure. Impregnated with a substance that changes color due to moisture absorption,
It has been applied.

Examples of the base material of the humidity indicator label used in the present invention include papers such as high-quality paper, coated paper, art paper, and cas-coated paper, nonwoven fabric, filter paper, fiber, and the like. The tensile strength of the humidity indicator label is 1 kgf or more, preferably 1.
5 kgf or more, more preferably 2 kgf or more. 1
When trying to stick the oxygen indicator packaging bag with a tack roller labeling machine using a humidity indicator label of kgf or less, the humidity indicator label may be broken, and the oxygen indicator label sticking oxygen absorber packaging bag is stably manufactured. Can not do.

[0008] In addition to cobalt chloride, the substance which changes color due to moisture absorption of the humidity indicator label used in the present invention includes iron chloride, copper chloride, nickel chloride, iron bromide, manganese bromide, manganese iodide, nickel sulfide, Manganese sulfate and the like are exemplified. The substance which changes its color due to moisture absorption is dissolved in water and then impregnated and applied to a substrate as an aqueous solution. The concentration of the aqueous solution is preferably 0.1% by weight or more.

The pressure-sensitive adhesive applied to the substrate of the humidity indicator label used in the present invention includes rubber-based pressure-sensitive adhesives such as natural rubber, styrene-butadiene copolymer, styrene-isoprene block copolymer, recycled rubber and synthetic rubber. And an acrylic pressure-sensitive adhesive containing, as a main component, an acrylic acid ester and a main component obtained by copolymerizing acrylic acid, acrylamide, vinyl acetate, styrene, acrylonitrile and the like. These adhesives are solvent-based, aqueous emulsion-based, hot-melt-based, and after being applied in the form of a liquid curable type, are dried to remove the solvent and low-boiling components.
The drying method is not particularly limited, and includes, for example, heating.

The release paper, which is the back substrate of the humidity indicator label used in the present invention, uses a support such as glassine paper, clay-coated paper, super calender paper, poly-laminate paper, plastic film, etc. as a base paper. It is manufactured by applying a release agent such as a solvent type or useless type silicone compound. The tensile strength of the release paper is 1 kgf or more when the width is 15 mm, preferably 1.5 kg.
f or more, more preferably 2 kgf or more. 1kgf
When the following release paper is used as a backing substrate and a humidity indicator label is used to attach it to an oxygen scavenger packaging bag using a tack roller labeling machine, the release paper may break, and the humidity indicator label can be stably removed. Oxygen package bags cannot be manufactured.

The humidity indicator label used in the present invention is affixed from release paper to the surface of the oxygen-absorbing agent packaging bag by hand or by a labeler. The labeler is not particularly limited, but examples thereof include a cut glue labeling machine, a roll labeling machine, a tack roll labeling machine, and the like, and in consideration of productivity per unit time, a tack roll labeling machine. Is preferred.

The oxygen scavenger packaging bag used in the present invention may be one having both oxygen scavenging ability and dehumidifying ability, or one having only oxygen scavenging ability. In the case of a substance having both a deoxidizing ability and a dehumidifying ability, a substance which does not require moisture to absorb oxygen is used as a deoxidizing agent. In this case, by attaching a humidity indicator label to the surface of the oxygen-absorbing agent packaging bag, it is possible to know the humidity in the gas barrier container during storage and to know whether or not the dehumidifying capacity has reached the limit. On the other hand, in the case of a oxygen-absorbing agent packaging bag having only an oxygen-absorbing ability, for example, in the case of a moisture-dependent oxygen-absorbing agent using iron powder, it depends on the humidity in the gas barrier container derived from the moisture contained in the storage object. Therefore, when the humidity in the gas barrier container is lower than 60% RH, the deoxidation rate is significantly reduced or the deoxygenation reaction is stopped. In this case, by attaching a humidity indicator label to the surface of the oxygen scavenger packaging bag and knowing the humidity, if the humidity is low during storage, know in advance that the function of the oxygen scavenger is not exhibited. Can be. Also, for example, in the case of cultural properties such as paintings and textiles that need to be stored at a constant humidity, an oxygen scavenger is used for insect control, but if a humidity indicator label is affixed to the oxygen scavenger, it can be easily stored in the container. This is suitable because it is possible to determine the appropriate humidity.

[0013] The oxygen scavenger used in the present invention is not particularly limited, but iron powder may be used as a material requiring moisture for oxygen absorption, and iron oxide may be used as a material not requiring moisture for oxygen absorption. In addition to ascorbic acid and catechol, oleic acid, linoleic acid, linolenic acid, soybean oil, linseed oil,
Examples thereof include unsaturated fatty acid compounds such as tall oil, and unsaturated hydrocarbon compounds such as isoprene oligomer, butadiene oligomer, and squalene. Further, these deoxidizing substances do not necessarily have to be a single substance, and may be a mixture of two or more kinds.

As the dehumidifying substance used in the present invention, paper made of natural pulp or synthetic paper, silica gel, alumina,
Activated carbon, synthetic zeolites such as molecular sieves, natural zeolites such as mordenite and erionite, perlite, activated clay, quicklime, barium oxide, calcium chloride, barium bromide, calcium hydroxide, calcium sulfate, magnesium chloride, magnesium oxide, magnesium sulfate , Aluminum sulfate, sodium sulfate, sodium carbonate, potassium carbonate, zinc chloride and the like. Further, these dehumidified substances do not necessarily have to be a single substance, and may be a mixture of two or more kinds.

The amount of the deoxidizing substance used in the present invention is an amount necessary to keep the atmosphere in the system at least substantially free of oxygen during the storage period, and preferably 1.
The amount is 1 to 10 times. Here, the substantially oxygen-free state means an oxygen concentration of 5% or less, preferably 1% or less, more preferably 0.1% or less.

The amount of the dehumidifying substance used in the present invention is an amount capable of substantially removing at least the water in the space volume in the gas-barrier closed container, and is preferably 1.1 to 500 of that amount. The range is twice as large, and is appropriately selected according to the barrier performance of the gas barrier container. Here, the state in which the water is substantially removed means a relative humidity of 30% or less, preferably 10% or less, more preferably 5% or less.

The deoxidizing substance and dehumidifying substance of the present invention are used in the form of powder, granules, tablets, sheets or the like as appropriate. It is not preferable that the oxygen-absorbing substance and the dehumidifying substance directly touch the article to be preserved, and the substance is packaged in a breathable packaging material and used as a packaging bag. Examples of the breathable packaging material include a material obtained by laminating a perforated polyethylene film on paper, nonwoven fabric, plastic film, or the like. The form of the packaging bag is not necessarily limited, and examples thereof include a small bag, a sheet, a blister packaging bag, and the like according to the purpose.

[0018]

EXAMPLES Examples of the present invention will be shown below, and will be described more specifically. Note that the present invention is not limited to these examples.

Example 1 A humidity indicator label was prepared as follows. 2kg of 3.4kgf filter paper at 15mm width
Acrylic adhesive 8m on one side cut into a size of mx 2cm
g. On the other hand, a silicone-based release agent is uniformly applied at a rate of 0.1 mg / cm2 to a 3.2 kgf glassine paper having a tensile strength of 15 mm width to prepare a release paper, and the filter paper coated with the above adhesive is attached. . next,
10 g of cobalt chloride is dissolved in 90 g of water to prepare a 10 wt% aqueous solution of cobalt chloride.
A 80% t% aqueous solution was uniformly applied to a filter paper on release paper and dried at 130 ° C. for 12 minutes to produce a humidity indicator label.

Next, the humidity indicator label was peeled off from the release paper and attached to a moisture absorption type oxygen absorber RP agent "RP-5A" manufactured by Mitsubishi Gas Chemical Co., Ltd. to prepare a moisture indicator label attached oxygen absorber packaging bag. . This oxygen indicator packaging bag with the humidity indicator label attached to it is supplied by Mitsubishi Gas Chemical Co., Ltd.
25 ° C, 60% RH in transparent gas barrier bag “PTS bag”
And sealed in a thermo-hygrostat at 25 ° C. and 60% RH. As a result, the humidity indicator label, which was pink at the beginning of storage, turned blue the next day and remained blue until 180 days later. In addition, 27
Observation after 0 days showed that the color changed to pink, and that the dehumidifying ability of the oxygen indicator packaging bag with the humidity indicator label reached its limit could be visually confirmed from the outside.

Example 2 Next, the above-mentioned humidity indicator labels were arranged side by side on a strip-shaped release paper, and were attached and wound into a roll. In addition, the tensile strength at 15 mm width of this humidity indicator label was 3.4 kgf, and the tensile strength at 15 mm width of the strip-shaped release paper was 3.2 kgf. An attempt was made to attach this roll-shaped humidity indicator label to the oxygen scavenger "RP-5A" using a tack roll label applicator.

Comparative Examples 1 to 3 and Examples 3 to 5 Next, the humidity indicator was attached to the oxygen absorber "RP-5A" by changing the tensile strength of the humidity indicator label and the strip-shaped release paper as shown in Table 1. The process was tested. As a result, both the humidity indicator and the strip-shaped release paper
When having a tensile strength of 1 kgf or more in width,
It turned out that it can be stably stuck.

[0023]

[Table 1]

Example 6 Next, a portion showing a relative humidity of 60% of a "humidity indicator card" manufactured by Humidical Co., Ltd. was placed on the surface of a water-dependent oxygen absorber "Ageless FX-100" manufactured by Mitsubishi Gas Chemical Company, Ltd. The package was affixed with a double-sided tape manufactured by Nichiban Co., Ltd. to prepare an oxygen absorber packaging bag with a humidity indicator label attached. 25 bags of this oxygen indicator label attached oxygen scavenger packaging
500 ° C., air at 95% relative humidity and 0.16 g water
24 hours later, the humidity indicator label remained pink and the relative humidity was 60 hours.
%, And the oxygen concentration in the PTS bag was measured to be 0.1% or less, indicating that the oxygen scavenger was working effectively.

Example 7 Next, the oxygen-absorbing agent packaging bag with the humidity indicator label of Example 9 was sealed in a PTS bag together with 500 ml of air at 25 ° C. and 95% relative humidity. After 24 hours, the humidity indicator label will turn blue, indicating less than 60% relative humidity,
When the oxygen concentration in the PTS bag was measured, it was 19%, and the function of the oxygen scavenger was not working sufficiently. This is because the moisture in the PTS bag was used as an oxygen scavenger due to the progress of the oxygen scavenging reaction, the humidity decreased, and the oxygen scavenging reaction was stopped halfway. From the results of Example 9 and Example 10, it was not possible to judge whether or not the deoxygenation reaction proceeded only by the relative humidity of the enclosed air, and the humidity indicator function of the oxygen absorber packaging bag with the humidity indicator label was used to display the humidity inside the sealed container. By knowing the actual humidity, it can be determined whether or not the deoxygenation reaction proceeds.

Example 8 Next, a relative humidity of 20% and 60% of "humidity indicator card" manufactured by Humidical Co., Ltd. was applied to the surface of a water-neutral oxygen absorber RP-5K manufactured by Mitsubishi Gas Chemical Co., Ltd. Was adhered with a double-sided tape manufactured by Nichiban Co., Ltd. to prepare a moisture indicator label-attached oxygen scavenger packaging bag. 25 bags of this oxygen indicator label attached oxygen scavenger packaging
Sealed in a PTS bag with 500 ml of air at 40 ° C. and 40% relative humidity. After 24 hours, the humidity indicator label was pink at 20% relative humidity and blue at 60% relative humidity, and visually confirmed that the relative humidity was 20% or more and less than 60%.

[0027]

The humidity in the sealed container can be determined by attaching a humidity indicator label to the surface of the oxygen scavenger packaging bag. In addition, the strength of the humidity indicator label is 1
When the strength of the release paper is 1 kgf or more in a width of 5 mm and the strength of the release paper is 1 kgf or more in a width of 15 mm, it is possible to stably produce an oxygen absorber packaging bag with a humidity indicator.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Hideaki Watanabe 2-5-2-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 3R067 AA05 AB96 AB99 BA12A BB01A BB06A BB14A BB15A CA09 EA04 EC22 EE04 EE25 EE47 GB12 GB13 GD08

Claims (3)

[Claims] 1. An oxygen scavenger packaging bag having a humidity indicator label attached to the surface. 2. The oxygen-absorbing agent packaging bag according to claim 1, wherein the tensile strength of the humidity indicator label is 1 kgf or more when the width is 15 mm. 3. The oxygen-absorbing agent packaging bag according to claim 1, wherein the tensile strength of the release paper used for the humidity indicator label is 1 kgf or more when the width is 15 mm.