JPH11190729A - Laminating oxygen sensing agent - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laminating oxygen sensing agent having a wide practical application range, an excellent discoloring performance corresponding to an oxygen concentration and a low cost. SOLUTION: The laminating oxygen sensing agent comprises a tape-like oxygen sensing agent 1 obtained by attaching an oxygen sensing composition by coating, printing or impregnating to a non-gas permeable and non-moisture permeable tape-like base materials, and a plastic single-side adhesive tape 2 having a partly transparent adhesive layer with a wider width than the agent 1 in such a manner that the overall oxygen sensing composition attaching surface of the agent 1 is adhered via the tape 2 substantially without air gap. Thus, the sensor is rapidly discolored corresponding to a change of the oxygen concentration in a package container. A reduction in the oxygen concentration can be easily visually sensed without time delay. Further, even under much moisture or oil environment, without a fault of a color tone. The sensor can be utilized for a quality control of a deoxidizing package food with safety. Even in the case of stocking under the condition that it is laminated on the deoxidizer package or in the package container, the sensor performs an excellent performance without deteriorating the color tone and discoloring speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oxygen detector which indicates the presence or absence of oxygen by a change in color tone. More specifically, it is a tape having an adhesive surface on one side, which is cut into an appropriate length, and the adhesive surface is used by attaching the adhesive surface to the inside of a deoxidizer package or a packaging container. About.

[0002]

2. Description of the Related Art An oxygen detector (also referred to as an oxygen indicator) is used to detect the presence or absence of oxygen based on the oxygen concentration in a packaging container for food or the like. Is indicated by a change in color tone. As an oxygen detector, a tablet-shaped product, a paper, a thread, absorbent cotton, a porous product such as a resin molded product impregnated with an oxygen detection composition solution, or a paper or film coated or printed with an oxygen detection composition Have been proposed. This oxygen detecting agent is widely used in the form of preserving the quality of foods or the like mainly by a deoxidizing agent as it is or in a state of being packaged in a plastic laminated film.

[0003] In addition, there are various advantages in fixing these oxygen detecting agents to the oxygen-absorbing agent package or in the inside of a packaging container in which goods to which the oxygen-absorbing agent is applied are packed. A method of fixing the oxygen detector with an adhesive or a double-sided tape has been proposed and put to practical use. In recent years, a configuration of an oxygen detecting agent mainly on the premise that the oxygen detecting agent is attached to a deoxidizer packaging bag has also been disclosed.

For example, Japanese Patent Application Laid-Open No. 64-66161 discloses an oxygen indicator in which an oxygen indicator layer is provided on at least one surface of synthetic paper.
Japanese Utility Model Application Laid-Open No. 4-3980 proposes an oxygen-absorbing agent packaging bag in which an oxygen-sensing agent sheet is bonded to an oxygen-absorbing agent bag with an adhesive or a double-sided tape to form an integrated type. However, these publications do not disclose an effective preventive measure against a case where moisture or oil contained in a preservation material such as food permeates the oxygen detector and the discoloration function is impaired.

Japanese Patent Application Laid-Open No. 8-282740 proposes an oxygen-absorbing agent-integrated oxygen detector obtained by laminating an oxygen-absorbing agent packaging bag / double-sided tape / detection agent sheet / transparent film in this order. ing. However, since this method uses a double-sided tape, it has problems such as being expensive, release paper being generated as waste, poor cuttability, and large thickness and poor flexibility. Further, when the oxygen detecting agent sheet and the transparent film are cut, there is a practical problem such that moisture or oil may penetrate the entire detecting agent sheet from the ends thereof to cause abnormal color tone.

Further, according to the study of the present inventors, when foods and the like are packaged and stored using an oxygen absorber, the discoloration of the oxygen detector often delays due to the decrease in the oxygen concentration in the packaging container. is there. That is, the discoloration of the oxygen detector does not respond quickly to the change in the oxygen concentration, which is inconvenient in food packaging management.

[0007]

SUMMARY OF THE INVENTION The present invention solves the problems of water resistance, oil resistance, thickness, and cost of the conventional adhesive detecting agent as described above, and has a wide practical range and excellent discoloration performance. The purpose of this study is to develop an oxygen sensing agent for application. In particular, it is an object of the present invention to provide a sticking oxygen detector which rapidly changes color in response to a change in oxygen concentration, and an article to which the oxygen detector is applied.

[0008]

SUMMARY OF THE INVENTION The present invention relates to a tape in which an atmosphere detecting agent such as an oxygen detecting composition is applied, imprinted, printed or impregnated to a non-breathable and moisture-permeable tape-like substrate. An oxygen sensing agent (1) and a plastic single-sided adhesive tape (2) wider than (1) and at least partially transparent and having an adhesive layer on one side. Oxygen detecting agent for tape application that is adhered substantially without voids, in other words, substantially all of the surface to which the oxygen detecting agent is attached is covered with the adhesive tape (2). Regarding the detection agent.

In the present invention, (1) is obtained by applying or printing an oxygen detecting composition on one surface of a tape-shaped substrate, and (1) is (1) substantially at the center in the width direction of (2). It is preferable that the surface of the oxygen sensing composition of (2) and the adhesive layer of (2) are adhered so as to be in contact with each other.

Further, in the present invention, (1) is characterized in that a plurality of oxygen sensing compositions are provided on one surface of a plastic film or synthetic paper having characteristics such as non-permeability or non-breathability which are blocked from the outside at regular intervals or at predetermined intervals. It is preferably applied or printed at intervals. In the present invention, it is preferable that the release agent is applied to the non-adhesive surface of (2). The present invention also relates to an oxygen sensing agent for application in which the above-mentioned tape-shaped oxygen sensing agent for application is cut to an appropriate length.

[0011] The present invention relates to a packaging container with an oxygen detecting agent, wherein the above-mentioned oxygen detecting agent for application is adhered inside a packaging container. The present invention also relates to an oxygen absorber package in which the oxygen detector for attachment is directly attached to the surface of the oxygen absorber package.

[0012] The present invention also provides a method for producing an oxygen-absorbing agent in a state where the above-mentioned tape-shaped oxygen detecting agent for adhering and a continuous body of an atmosphere regulator such as an oxygen scavenger are continuously adhered to each other. The present invention relates to a method for manufacturing a package for an oxygen scavenger to which an oxygen sensing agent is attached, wherein the package is separated into individual pieces.

In the present invention, the tape shape means a state where the length is longer than the width and the thickness is thinner than the width. The oxygen sensing agent for application of the present invention has a thickness of preferably 2 mm or less, more preferably 0.5 mm or less, and a width of 3 mm or more and 30 mm or less. The length is not particularly specified because it is used after being cut into appropriate dimensions at the time of application, but in order to keep the production cost and the cost of use of the oxygen detector for application to a minimum,
It is preferable that the length is at least several tens m or more that enables continuous processing.

The oxygen detecting agent for tape-like sticking of the present invention comprises a tape-like oxygen detecting agent and a single-sided adhesive tape made of plastic (hereinafter sometimes referred to as a single-sided adhesive tape). Since the cost can be reduced and the operability at the time of use is high, the total cost as an oxygen detector can be reduced. Furthermore, since the single-sided adhesive tape seals the oxygen-sensing composition surface of the tape-shaped oxygen sensing agent at the substantially central portion thereof, and adopts a simplified layer configuration in which the adhesive is stuck at portions near both ends, In addition to being thin and flexible, it has excellent discoloration performance as an oxygen detecting agent and excellent water and oil resistance, and exhibits its original oxygen detecting performance without deterioration in performance even under severe conditions of high humidity. In addition, since it is excellent in flexibility, good sticking properties can be exhibited on a surface having irregularities or a surface having low rigidity such as an oxygen scavenger packaging bag or a food packaging container. In addition, no waste such as release paper is generated at the time of use, and it is easy to use.

In use, the oxygen detecting agent of the present invention is covered with a single-sided adhesive tape on its surface, and the opposite surface is sealed with a tape-like base material and isolated from the outside atmosphere. The color change response speed to the decrease in the oxygen concentration in the atmosphere is faster than that of the conventional oxygen detector in which the composition is in direct contact with the atmosphere. Although the mechanism is not clear, the single-sided adhesive tape prevents excessive moisture absorption, which causes deterioration of oxygen detection performance, and has the function of appropriately transmitting atmospheric gas. It is presumed to be related to preventing the detection agent component from migrating outside.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a cross-sectional view in the width direction of an oxygen detector for application according to the present invention, wherein (1) is a tape-shaped oxygen detector and (2) is a single-sided adhesive tape. In the single-sided adhesive tape, the adhesive of (4) is applied or laminated on one side of the plastic film of (3). At substantially the center in the width direction of the single-sided adhesive tape, a tape-shaped oxygen detector having a width A smaller than the width B of the single-sided adhesive tape is fixed to (3) by the adhesive of (4). Since the width A is smaller than the width B, the adhesive portions C and C ′ remain on both sides of the tape-shaped oxygen detecting agent, and these portions are attached to an adherend such as an oxygen absorber package. C and C 'do not necessarily have to have the same dimensions as long as the ability to stick to the adherend is not lost.

The plastic single-sided pressure-sensitive adhesive tape used in the present invention has a pressure-sensitive adhesive applied or laminated on one side of a plastic film. As the material of the plastic film, polyethylene, polypropylene,
Polyester, polyamide, polycarbonate, cellulose acetate, cellophane and the like, but transparency,
From the viewpoints of flexibility and strength, stretched polypropylene and polyester are preferred. The thickness of the plastic film is not particularly limited as long as it has practical strength and flexibility.
00 microns is preferred. The plastic film may be colorless and transparent, or may be transparent and appropriately colored to make the color change of the oxygen detector easy to see. In addition, leave one part transparent so that the color change of the oxygen detector can be seen, display information such as hidden characters and pictograms on the other part, and use an appropriate color tone for the purpose of making it easier to distinguish the oxygen detector color tone. May be printed. The oxygen permeability of the plastic film is preferably from 50 to 3000 cc / m ² · day · atm. The moisture permeability is preferably 50 g / m ² · day or less.

As the adhesive, synthetic rubber, natural rubber,
Existing materials such as acrylic and silicon can be used. Preferably, the adhesive is applied or laminated on one entire surface of the plastic film. At this time, the type and thickness of the pressure-sensitive adhesive should be such that the dye used for the oxygen detector does not dye or inhibit the discoloration of the dye, that it is excellent in transparency, that it is excellent in safety and sanitation, and that it is appropriate for the adherend What is necessary is just to select suitably in consideration of the fact that a high adhesiveness is obtained. Adhesive processing methods for plastic films include known methods such as a method of applying an adhesive as an emulsion or diluting with a solvent, drying after application, a method of extruding and laminating the adhesive, and a method of transferring the filmed adhesive from a release paper. A method is used.

The width of the single-sided pressure-sensitive adhesive tape obtained in this manner is larger than the width of the tape-shaped oxygen detecting agent.
It is sufficient that the width of C ′ and C ′ can be ensured, but from the viewpoint of handleability and cost, it is preferably 3 to 50 mm, and particularly preferably 5 to 30 mm. The widths of C and C ′ in FIG.
mm is preferred. In addition, when unwinding a single-sided adhesive tape wound on a paper tube, etc., it can be smoothly unwound with low resistance.Therefore, it is possible to apply a release agent such as silicone or alkyd resin to the non-adhesive side. preferable.

The tape-shaped oxygen detecting agent is obtained by adhering an oxygen detecting composition to a tape-shaped substrate, and indicates the presence or absence of oxygen by changing the color of the oxygen detecting composition according to the oxygen concentration in the surrounding atmosphere. . Examples of the oxygen sensing composition include anthraquinone-based, indigo-based, thiazine-based, dyes that change color by a reducing agent such as a sulfur dye, alkaline substances such as alkali metal or alkaline earth metal hydroxides and salts, and reducing sugars. A composition containing a reducing agent as an essential component is preferably used. To these essential components, if necessary, a combination of a dye or a pigment that does not discolor with a solvent and a reducing agent, a water-soluble polymer, a binder resin, and the like is added, and the resultant is adhered to the tape-shaped substrate. Examples of the attachment method include coating, printing, and impregnation.

In order to exhibit high oxygen detection performance even under severe conditions of high humidity, the tape-shaped oxygen detection agent is substantially impermeable to moisture on one side of non-breathable and non-breathable synthetic paper or film. What applied or printed the oxygen detection composition is preferably used. As the tape-shaped substrate, non-breathable and non-breathable synthetic paper or film is used. For example, polyethylene, polypropylene, polyester, polyamide, polycarbonate, cellulose acetate, cellophane and the like, but transparency, flexibility,
From the viewpoint of strength and the like, stretched polypropylene or polyester is preferred. The thickness of the tape-shaped substrate is not particularly limited as long as it has practical strength and flexibility, but is preferably 10 to 100 microns. The oxygen permeability of the tape-shaped substrate is 50 to 30.
00 cc / m ² · day · atm is preferable, and moisture permeability is preferably 50 g / m ² · day or less.

The tape-shaped substrate is preferably opaque or appropriately colored in order to make the color change of the oxygen detector easy to see. In addition, leave one part transparent so that the color change of the oxygen detector can be seen, display information such as hidden characters and pictograms on the other part, and use an appropriate color tone for the purpose of making it easier to distinguish the oxygen detector color tone. May be printed. The width of the tape-shaped oxygen detector is preferably 2 to 20 mm. If it is too narrow, it becomes difficult to see, and if it is too wide, the cost increases and handling becomes inconvenient. The thickness is preferably 1 mm or less, particularly preferably 0.5 mm or less, in terms of flexibility and aesthetics.

When the tape-shaped oxygen detecting agent is combined with a single-sided adhesive tape, the color changing portion may be continuous in the tape length direction. However, in order to make it easy to distinguish the color change, the color changing portion is colored in the tape length direction. It is preferable that the changed part and the part that does not change are alternately present. Preferred patterns are illustrated in FIGS. FIG. 2 shows a combination of a single-sided pressure-sensitive adhesive tape which is entirely transparent, and a tape-shaped oxygen detecting agent in which an oxygen detecting composition is continuously arranged in a dot shape. FIG. 3 shows a combination of a single-sided pressure-sensitive adhesive tape having a transparent portion continuous in the length direction and a tape-shaped oxygen detecting agent in which the oxygen detecting composition is arranged in stripes. FIG. 4 shows a combination of a single-sided pressure-sensitive adhesive tape having a transparent portion intermittently in the length direction and a tape-shaped oxygen detecting agent having an oxygen detecting composition disposed on the entire surface. Note that the present invention is not limited to these examples.

The tape-shaped oxygen detector for sticking of the present invention comprises:
A tape-shaped oxygen sensing agent is one in which the entire surface of the oxygen sensing composition and the adhesive layer are adhered to each other without gaps near the center in the width direction of the single-sided adhesive tape, for example, a shape in which a tape of several tens of meters or more is wound around a paper tube. You are. What is near the center in the width direction is
In FIG. 1, C and C ′ are positions giving a width for obtaining a sufficient bonding ability to the adherend.

Since the pressure-sensitive adhesive layer is formed on the pressure-sensitive adhesive surface of the single-sided pressure-sensitive adhesive tape, the surface of the oxygen-sensing composition of the tape-shaped oxygen detector and the single-sided pressure-sensitive adhesive tape are adhered to the single-sided pressure-sensitive adhesive tape substantially without gaps. If there is a gap between the oxygen sensing composition surface and the adhesive layer of the single-sided adhesive tape due to the fact that they are not adhered, the oxygen concentration in the packaging container when packaging and preserving food or the like using an oxygen absorber. The color change of the oxygen detecting agent may be delayed with respect to the change of.

The tape-shaped oxygen sensing agent for application is cut into appropriate lengths to be used as individual oxygen sensing agents for application, and is used by attaching to a packaging material or an oxygen absorbing agent for use in deoxygenating food packaging. . Alternatively, the tape-shaped oxygen detector and the single-sided pressure-sensitive adhesive tape may each be wound up, for example, in a length of several tens of meters or more, unwinded and superimposed at the same time, and attached to an adherend immediately after use.

In particular, the oxygen scavenger package to which the oxygen detector for affixing is stuck is conveniently used when deoxidizing and packaging food. As a method of manufacturing the oxygen absorber package to which the oxygen detector for application is applied, a tape-shaped oxygen detector for application and an oxygen absorber continuous package are continuously attached, and the tape is kept attached. In this state, the method of separating the oxygen-absorbing agent package into individual oxygen-absorbing agent packages is low in cost and reasonable.

Further, the oxygen detecting agent for application may be attached inside the packaging container to form a packaging container with the oxygen detecting agent. For example, the oxygen detector is attached to a structure such as a plate or a partition in a packaging container or a packaging material so that the oxygen detecting agent can be visually recognized from the single-sided adhesive tape side.

FIG. 5 shows an example of the oxygen scavenger package to which the oxygen detector for adhering shown in FIG. 3 is attached. FIG.
Fig. 2 shows an example of the oxygen absorber package to which the oxygen detector for application of Fig. 2 is attached. In any of the oxygen detectors, the tape-shaped oxygen detector is attached to the plastic single-sided adhesive tape at the portion A shown in FIG. 1 and is attached to the oxygen absorber package at the portions C and C ′.

[0030]

EXAMPLES The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the present invention is limited thereto.
In addition, the color tone of the oxygen detecting agent in the examples is indicated by the color number of a color sample (color selector) issued by GE Planning Center. The description of the color tone numbers is shown in Table 1.

[0031]

[Table 1]

Example 1 Preparation of Oxygen Sensing Composition Fine powder of magnesium hydroxide as an alkaline substance, fructose as a reducing agent, and methylene blue (CIBa
sic Blue 9), an ink containing ethylcellulose as a binder resin, phloxine (CIAcid Red 92) as a pigment that does not discolor by a reducing agent, and water-methanol as a solvent.

[Preparation of Tape Oxygen Sensing Agent] A polypropylene synthetic paper (Yupo, trade name, manufactured by Oji Paper Co., Ltd., thickness 70 μm) was used as a base material, and a line width of 5 mm, a line interval of 5 mm, and a plate depth were formed on one surface. Using a gravure printing machine in which two rolls of a diagonal stripe plate of 80 microns and one roll of a solid plate having a depth of 40 microns were set in this order, the oxygen detection composition ink was used for the stripe plate, and the overprinting agent (thermo) was used for the solid plate. Light P) was printed. The moisture of the printed product is 105 ° C 70
The heat loss was 0.5% or less, and substantially no water remained. This printed matter was slit into a width of 5 mm, and a tape-shaped oxygen detector was obtained in the form of a roll having a length of 100 m. The ink thickness of the printed portion was 20 microns.

[Preparation of single-sided pressure-sensitive adhesive tape] An acrylic pressure-sensitive adhesive is coated as a pressure-sensitive adhesive on one surface of a back-printed stretched polypropylene film (40 μm in thickness), and a silicon-based release agent is coated on the other surface. After coating, slit to a width of 12 mm, wind 100 m around a 3-inch paper tube, and have a transparent part continuous in the length direction of 4 mm width in the center in the width direction,
A single-sided pressure-sensitive adhesive tape having white letters printed on a grayish green background was obtained in other portions.

[Preparation of Tape-like Oxygen Detecting Agent] The tape-shaped oxygen detecting agent and the single-sided adhesive tape are applied to an apparatus composed of two sets of upper and lower unwinding rolls, a guide and a take-up roll. At approximately the center in the width direction of the pressure-sensitive adhesive tape, the tape-shaped oxygen detector is wound 100 m onto a 3-inch paper tube of a take-up roll with the positions aligned so that the oxygen-sensitive composition and the pressure-sensitive adhesive surface are in contact and overlap with each other, as shown in FIG. Thus, a tape-shaped oxygen detector for sticking was obtained. The color change of the oxygen detector for attachment was CS21-04 (dark blue) in air, and CS26-04 (red) in an atmosphere in which the oxygen concentration was reduced to 0.1% or less by an oxygen scavenger.

[Preparation and Storage of Oxygen Detector Package with Oxygen Detector Affixed thereon] Using an affixing device consisting of a plurality of unwinding rolls, guides, pressure rolls, thickness detecting rolls, and a cutter, the oxygen absorber roll is formed. Unwinding and introducing a continuous package (Ageless SA-100R, trade name, manufactured by Mitsubishi Gas Chemical Co., Ltd.), laminating the above-mentioned tape-shaped oxygen detecting agent on one surface thereof, affixing it with a pressure roll, and detecting the thickness. The oxygen-absorbing agent package was cut off one by one with a cutter interlocking with the roll to obtain an oxygen-absorbing agent package to which the oxygen detector was attached. Further, 100 pieces of each of these were laminated with a gas barrier laminated film (KON
/ PE), and the inside of the bag was heat-sealed by evacuating the air inside. This one
It was stored in a temperature-controlled warehouse at 5 ° C.

[Measurement 1. Oxygen Detector Discoloration Rate Test] For the oxygen absorber package to which the oxygen detector has been attached before storage and one month after storage, one package is a gas barrier bag (180 × 25).
0 mm) and sealed with absorbent cotton impregnated with 500 ml of air and 80% RH humidity control solution. The gas in the bag is sampled little by little over time, and the oxygen concentration is measured using an oxygen analyzer manufactured by Toray Industries, Inc. The color tone of the detection agent was observed.
The results are shown in Table 2.

[Measurement 2. Food packaging test] The oxygen absorber package to which the oxygen detector had been attached before storage was sealed together with two donuts in a gas barrier bag (180 x 250 mm) by heat sealing, and stored in a room at 25 ° C. One month after storage, open the bag while observing the color of the oxygen detector over time,
The color change of the oxygen detector was observed. The results are shown in Table 3.

Example 2 A tape-shaped oxygen detector was prepared in the same manner as in Example 1 except that a stretched polyester film (thickness: 40 μm) was used instead of stretched polypropylene as a single-sided adhesive tape. Was obtained. Using this, Measurement 1 and Measurement 2 were performed in the same manner as in Example 1. The results are shown in Tables 2 and 3.

Example 3 A tape-shaped oxygen detector was prepared in the same manner as in Example 1 except that a synthetic rubber-based pressure-sensitive adhesive was used instead of the acrylic pressure-sensitive adhesive as the pressure-sensitive adhesive for the single-sided pressure-sensitive adhesive tape. An oxygen scavenger package to which the agent was applied was obtained. Using this, Measurement 1 and Measurement 2 were performed in the same manner as in Example 1. The results are shown in Tables 2 and 3.

Comparative Example 1 The tape-like oxygen detector prepared in Example 1 and a double-sided tape having a width of 5 mm were supplied to the sticking apparatus used in Example 1, and introduced into the non-printing side of the tape-like oxygen detector. After sticking one side of the oxygen absorber continuous package with double-sided tape, cut the oxygen absorber package one by one with a cutter linked to the thickness detection roll, and remove the tape-shaped oxygen detector with the double-sided tape. An oxygen agent package was obtained. Using this, Measurement 1 and Measurement 2 were performed in the same manner as in Example 1. The results are shown in Tables 2 and 3.

Comparative Example 2 A tape-shaped oxygen detector was prepared in the same manner as in Example 1 except that water- and oil-resistant paper (trade name: WOP, manufactured by Chuetsu Pulp Co., Ltd., thickness: 80 μm) was used instead of the polypropylene synthetic paper. Was prepared in the same manner as in Comparative Example 1 except that the oxygen-absorbing tape was fixed with a double-sided tape, and measurement 1 and measurement 2 were performed using the same. Was. The results are shown in Tables 2 and 3.

[0043]

[Table 2]

[0044]

[Table 3]

From the results of measurement 1 (Table 2), in Example 1, the oxygen detector reached the color tone CS26-04 immediately after the oxygen concentration in the bag reached 0.1% both before and after storage, and the color tone became faint. From this, it can be seen that the oxygen detector for application of the present invention has an excellent oxygen concentration indicating function and also has excellent storage stability. On the other hand, in Comparative Examples 1 and 2, there was a delay in the color change rate of the oxygen detector even before storage, and after storage, the color change rate became remarkable and the color tone became faint, making it difficult to determine. . This was considered to be because the oxygen sensing composition was deteriorated by the humidity (97% RH / 25 ° C.) of the oxygen absorber package. In particular, those using a non-moisture-permeable tape-shaped oxygen detector showed better performance than the moisture-permeable ones, and it is presumed that the dye movement in the thickness direction due to moisture permeation is a factor in the performance change. Was.

Also, from the results of Measurement 2 (Table 3), in the comparative example in which the single-sided pressure-sensitive adhesive tape was not used, the oil content or moisture of the donut caused an abnormal color tone of the oxygen detecting agent. It can be seen that while the color reversion to blue is insufficient and the color density is low, the embodiment of the present invention maintains the color tone well and maintains the discoloration performance even after opening.

Example 4 An oxygen detector roll for tape application in Example 1 was replaced with a commercially available office tape dispenser (trade name: TM, manufactured by KOKUYO Co., Ltd.).
12) and repeated hand-drawing and cutting to an appropriate length as in the case of the adhesive tape for office use, but it was possible to cut out an oxygen sensing agent for application of any length without any problem. An oxygen detector for attachment cut out to a length of 1 cm is attached to the back surface of a polystyrene dish (150 × 110 cm), and an oxygen scavenger package (Ageless FX-30 manufactured by Mitsubishi Gas Chemical Co., Ltd.) is placed on the dish. After putting 70 g of the cheese, it was put in a gas barrier bag (150 × 200 mm), and the bag mouth was heat-sealed. At this time, the color tone of the oxygen detector is
It was CS21-04. When this was stored in a thermostat at 5 ° C., the next day, the oxygen concentration in the bag had decreased to 0.02%, and the color tone of the oxygen detector had changed to CS26-04.

Further, one pinhole is opened in the bag with a sewing needle,
The next day, when the oxygen concentration in the bag was measured, it was found to have risen to 0.4%. At this time, the color of the detecting agent changed to CS24-04, and abnormality of the bag could be detected. Two days later, the oxygen concentration in the bag had increased to 12%, and the color tone of the detection agent had changed to CS22-04 in response. In measuring the oxygen concentration in the bag, a small amount of gas in the bag was sampled and analyzed using a gas chromatograph. It has been found that the oxygen detector for application of the present invention faithfully reflects the change in color tone when an abnormality occurs in the food packaging container to which the oxygen scavenger is applied and the oxygen scavenging state is impaired.

[0049]

According to the oxygen detecting agent for application of the present invention, the oxygen detecting agent rapidly changes its color in response to the change in the oxygen concentration in the packaging container due to the oxygen scavenger, and the oxygen concentration decreases with a time delay. This achieves the effect that detection can be easily performed visually without accompanying. Further, in the oxygen absorber to which the oxygen detector for application of the present invention is applied, the oxygen detector rapidly discolors in response to a change in the oxygen concentration in the packaging container, and the change in the oxygen concentration is not accompanied by a time delay. It is suitably used for preservation of foods and the like as an oxygen scavenger having a function of being easily detectable visually.

The oxygen sensing agent for application of the present invention can be manufactured at low cost because of its simple structure, and can be formed into a thin and flexible tape like a general single-sided adhesive tape. In addition to being able to be cut to any length for use, it can also be automatically and continuously manufactured, cut and pasted mechanically, and is extremely easy to use. In addition, since it is excellent in flexibility, good sticking properties can be exhibited on a surface having irregularities or a surface having low rigidity such as an oxygen scavenger packaging bag or a food packaging container. In addition, no waste such as release paper is generated during use, and the usability is good.

Furthermore, the oxygen detector for application of the present invention does not show abnormal color tone even in an environment with a lot of moisture or oil, and can be stored in a state of being attached on the oxygen absorber package or inside the packaging container. Since there is no deterioration in color tone and discoloration rate and it has excellent performance as an oxygen detector, it can be safely used for quality control of deoxygenated packaging of foods and the like. In addition, oxygen concentration can be displayed in color tone, excellent color change speed performance, and excellent color tone stability and water and oil resistance are used. It can be used with the same ease as commercially available adhesive tapes, labels and patches.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an example of the oxygen detector for tape-like application of the present invention.

FIG. 2 is a sketch drawing showing an example of a design of the oxygen detecting agent for tape-like application of the present invention.

FIG. 3 is a sketch drawing showing an example of a design of the oxygen detector for tape-like application of the present invention.

FIG. 4 is a sketch drawing showing an example of a design of the oxygen detector for tape-like application of the present invention.

FIG. 5 is a plan view showing an example of an oxygen-absorbing agent package to which the oxygen-sensing agent for application of the present invention is attached.

FIG. 6 is a plan view showing an example of an oxygen scavenger package to which the oxygen detector for application of the present invention is stuck.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tape-shaped oxygen detector 2 Single-sided adhesive tape 3 Plastic film 4 Adhesive

Claims (9)

[Claims] The present invention relates to a tape-shaped oxygen detecting agent in which an oxygen detecting composition is attached to a non-breathable and non-breathable tape base material (1).
And a plastic single-sided adhesive tape (2) wider than (1) and at least partially transparent and having an adhesive layer on one side.
Wherein the entire surface of the tape-shaped oxygen detector (1) to which the oxygen-sensing composition is attached is adhered substantially without gaps by a single-sided adhesive tape (2). 2. The oxygen detecting agent for tape-like sticking according to claim 1, wherein the tape-shaped oxygen detecting agent (1) is adhered substantially at the center in the width direction of the single-sided adhesive tape (2). 3. The tape according to claim 1, wherein the tape-shaped oxygen detecting agent (1) is one in which the oxygen-detecting composition is applied, printed or impregnated on one surface of a tape-shaped substrate. Oxygen detecting agent for sticking in a shape. 4. The tape according to claim 1, wherein the tape-shaped oxygen detecting agent (1) has a plurality of oxygen-detecting compositions attached to one surface of the tape-shaped substrate at regular intervals. Oxygen detecting agent for sticking in a shape. 5. The oxygen detector according to claim 1, wherein a release agent is applied to a surface of the single-sided adhesive tape (2) having no adhesive layer. 6. The oxygen detecting agent for application according to claim 1, wherein the oxygen detecting agent is cut into an appropriate length. 7. A packaging container with an oxygen sensing agent, wherein the oxygen sensing agent for application according to claim 6 is attached inside a packaging container. 8. An oxygen-absorbing agent package with an oxygen detector, wherein the oxygen-sensing agent according to claim 6 is attached to the surface of the oxygen-absorbing agent package. 9. After continuously adhering the oxygen detecting agent for tape-shaped application according to claim 1 and the oxygen absorber continuous body,
A method for producing an oxygen-absorbing agent-attached package with an oxygen-detecting agent, wherein the oxygen-absorbing agent-encapsulated body is cut off so as to be separated one by one while being attached.