JPH08324592A - Packing bag - Google Patents

Abstract

PURPOSE: To prevent deterioration from occurring in food directly or indirectly attributable to oxygen by keeping a deoxidizing agent in a preservative-holding region, and a liquid article or an article coexisting with a liquid in an article- holding region. CONSTITUTION: A packaging bag 1 is formed by using a composite sheet 2 having a gas-barrier property for each of the outer sides and a porous, low- density polyethylene sheet 3 which is a little shorter than the composite sheets 2 between the composite sheets 2 and by sealing the work at four terminating places 4, 4, 5, 6 under heat. This packing bag 1 is provided with an article- holding region 6 and a preservative-holding region 7, the latter being a little smaller in capacity than the former, by the use of the porous, low-density polyethylene sheet 3. A deoxidizing agent is kept in the preservative-holding region 7 and a liquid or an article coexisting with a liquid, in the article-holding region 6. This constitution enables preventing deterioration of food which is directly or indirectly attributable to oxygen.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is directed to the rapid removal of oxygen in liquid articles or articles coexisting with liquids, thereby providing such articles (eg, foods, pharmaceuticals, quasi drugs and quasi drugs). The present invention relates to a packaging bag capable of storing cosmetics, etc.) in an oxygen-free environment.

[0002]

2. Description of the Related Art It is known to provide a separate chamber made of a porous plastic sheet in a packaging bag made of a gas-impermeable plastic sheet (Japanese Utility Model Publication No. 57-30298, Japanese Utility Model Publication 58). -45258 gazette, actual development Sho 59-3
No. 879, No. 59-89880 and No. 3-32079).

In these packaging bags, an oxygen scavenger or the like is filled in a chamber formed of a porous plastic sheet, and the oxygen scavenger or the like acts through the plastic sheet.

8 to 10 show some of these known packaging bags.

FIG. 8 is a longitudinal sectional view of a packaging bag in which a small chamber 82 is provided with a gas permeable plastic sheet 81 on the inner bottom portion of the packaging bag 80 formed of a gas barrier plastic sheet (actual). (See Japanese Patent Laid-Open No. 59-89880).

In the packaging bag of FIG. 8, the fragrance component is filled in a small room 82, and the gas permeable plastic film 81 is filled.
Through to the room 83 for storing articles. FIG. 9 is a vertical cross-sectional view of a packaging bag in which the inside of a packaging bag 90 formed of a gas barrier plastic sheet is divided into two storage parts by a hydrophobic porous membrane film 91 (see Japanese Utility Model Publication No. 58-45258). ).

In the packaging bag of FIG. 9, the oxygen scavenger 92 is filled in one storage portion 93 so that the oxygen scavenger 92 acts on the other storage portion 94 through the hydrophobic porous membrane film 91.

FIG. 10 shows a gas barrier plastic sheet.
FIG. 3 is a perspective view of a large bag in which a pocket portion 101 similar to a standback is formed by a non-woven fabric or a perforated polyethylene sheet inside a large bag 100 formed by a sheet (see Japanese Utility Model Laid-Open No. 3-32079). . In the large bag shown in FIG. 10, a small bag (not shown) containing an oxygen scavenger is a pocket 1
No. 01, and the oxygen scavenger is made to act through a non-woven fabric or a perforated polyethylene sheet.

On the other hand, a gas transport phenomenon (movement phenomenon, typically a porous plastic sheet) in a gas permeable membrane.
It is generally extremely complicated and difficult to treat theoretically (also called diffusion phenomenon) because the factors that influence the transport phenomenon are not so clear and there are too many factors that influence it. The theoretical treatment of gas transport phenomena in gas permeable membranes is not clear (Fumio Osawa et al .: Membrane function (Kyoritsu Shuppan, 1978) p1
80-183 etc.).

Attempts have been made to explain the transport phenomenon when a gas diffuses and separates in a gas permeable membrane by a simple and simple hypothesis which has been explained under many hypothetical conditions.

The typical hypothesis is that the interaction between gas molecules and the pores of the gas permeable membrane is small (ie,
Gas flow when the pores of the gas permeable membrane are large) and gas flow when the effect of the interaction between gas molecules and pores of the gas permeable membrane is large (that is, when the pores of the gas permeable membrane are small) It will be explained separately.

In that case, the former gas flow (gas flow when the pores are large) is a capillary flow or a viscous flow (poise).
It is described as an "ulle flow".

The latter gas flow (gas flow when the pores are small) is an activated diffusion flow or an activated flow (activ).
described as an aged flow).

According to the typical hypothesis, gases such as oxygen and carbon dioxide, vapors of various organic compounds which are components of water vapor, aroma and aromano can be treated as those exhibiting similar behavior. It is suggested that you can.

It is generally explained that the gas due to the capillary flow is transported through the gas permeable film by using the pressure difference between the gas on both sides of the gas permeable film as a driving force and is not significantly affected by other factors.

In the capillary flow, the gas transport amount is directly proportional to the fourth power of the pore diameter of the gas permeable membrane, the pressure difference between the gas on the front and back of the gas permeable membrane, and the porosity. It is generally described as being inversely proportional to.

On the other hand, the activated diffusion flow (having a pore size of 10
(There is also a theory that it is applied in the case of angstrom (10 ^-3 μ) or less), because gas molecules collide with the pores of the gas permeable membrane in various states, so various properties of gas molecules and gas permeation It is generally explained that the various properties of the membrane and the interaction of the gas with the pores of the gas permeable membrane will change the amount of gas transported through the gas permeable membrane.

The activated diffusive flow is 1 by Graham.
This is a hypothesis developed based on the "dissolution / diffusion mechanism" of the behavior of gas permeating a rubber membrane, which was announced in the 800's.

According to the activated diffusion flow, the gas is condensed (concentrated) in the gas permeable membrane according to Henry's law on the high gas concentration side of the gas permeable membrane, dissolved in the gas permeable membrane, and the concentration gradient causes the gas permeable membrane to flow. Is generally described as being diffused toward the low gas concentration side, desorbed from the gas permeable membrane surface, and released to the low gas concentration side. The diffusion process is generally described by Fick's diffusion equation as conforming. Factors on the gas molecule side that affect the gas permeation amount include the structure of the gas molecule (particularly three-dimensional structure), size, polarity, cohesive energy density, solubility in the gas permeable membrane, and compatibility with the gas permeable membrane. Is generally mentioned.

Factors on the gas permeable membrane side that affect the gas permeation amount include higher-order structure, molecular structure (especially intermolecular chain distance and intermolecular distance), polarity, crystallinity, crystallinity, and flexibility. And compatibility with gas molecules are generally mentioned.

Therefore, in the selective permeation of gas molecules in which the activated diffusion flow is predominant, both the gas-side and gas-permeable membrane side factors that affect the gas permeation amount must be clarified. The general idea is that the amount of gas passing through cannot be specified.

However, in the conventional proposals, there is almost no disclosure of specific conditions for the gas permeable membrane.

Moreover, the conventionally proposed gas permeable membranes, which disclose specific conditions, are non-woven fabrics or perforated polyethylene sheets (see Japanese Utility Model Laid-Open No. 3-32079) or have diameters of 0.1 to 10 m / m. Plastic sheet with holes
(See Japanese Utility Model Laid-Open No. 59-3879), and it cannot be said that the membrane can be used for gas separation.

Therefore, in the prior art, the actual condition is that no consideration or proposal has been made on the packaging bag provided with the technique of selectively permeating gas through the gas permeable membrane.

[0025]

According to the above hypothesis that the gas transport phenomenon in the gas permeable membrane is divided into the capillary flow and the activated diffusion flow, the gas on the high concentration side is permeated through the gas permeable membrane. , Dealing with the case of emission to the low gas concentration side.

Therefore, even if the oxygen dissolved in the liquid can be selectively permeated through the gas permeable membrane, the conditions required for the gas permeable membrane in that case have not been known.

Further, there has been substantially no study or proposal for selectively capturing oxygen dissolved in a liquid through a gas permeable membrane.

On the other hand, since the quality of the liquid coexisting article (typically, food etc.) may be rapidly deteriorated due to the presence of oxygen, the liquid coexisting article in the packaging bag is maintained at high quality. However, there is a problem in that it is necessary to remove oxygen from an article coexisting with a liquid material in the shortest possible time.

Further, oxygen has a problem in that it has a function of rapidly reducing the quality of food by a synergistic effect with light, heat and the like that enter the packaging bag from the outside.

Under such circumstances, the present inventors have conducted a test on a packaging bag capable of removing oxygen from an article in which a liquid substance coexists in the packaging bag through a gas permeable membrane in a short time (preferably within 44 hours). Considered as the main body, such a packaging bag was found in the present invention.

Further, it has been experimentally found by the present inventor that if the dissolved oxygen can be removed from the article coexisting with the liquid material within 44 hours, the deterioration of the quality of the food due to the presence of oxygen can be prevented to a considerable extent. It was

Here, the present invention is capable of removing oxygen from a liquid product or a product coexisting with a liquid product within a desired short time, and the product derived directly or indirectly from oxygen ( Typically, to provide a packaging bag that can prevent the deterioration of the quality of food) and maintain the high quality of the articles,
With the goal.

It is an object of the present invention, in particular, to provide a packaging bag that enables transportation, display or storage of liquid articles or articles coexisting with liquid articles in an oxygen-free environment.

The present invention more specifically relates to about 44 after packaging.
It is an object of the present invention to provide a packaging bag that allows a liquid article or an article coexisting with a liquid article to be placed in an oxygen-free environment within a time period or a short time period close thereto.

[0035]

The packaging bag according to the present invention comprises:
In a packaging bag formed of a gas barrier plastic sheet, the inside thereof is provided with a preservative storage area and an article storage area by a boundary surface having a gas permeable membrane defined below. At least an oxygen scavenger is stored in the preservative storage area, and a liquid article or a liquid coexisting article is stored in the article storage area.

Gas Permeable Membrane The gas permeable membrane is a non-polar or small-polarity, sheet-like material formed of plastic having a crystallinity of about 80% or less or amorphous, and further JIS-P. −
Air permeability measured by 8117 is 100 to 1,300
Seconds / 100 ml.

[Detailed Description of the Invention] The packaging bag according to the present invention has the above-mentioned structure, and has been found by the present inventor through repeated experimental studies. <Packaging bag> The packaging bag according to the present invention has an outer side formed of a gas barrier plastic sheet, and any type of gas (including water vapor) cannot or cannot easily penetrate into the packaging bag. There is.

The plastic sheet may be a sheet made of a single kind of plastic having an excellent gas barrier property, but a composite gas sheet having a high gas barrier property by lamination is generally used.

Examples of the composite plastic sheet include polyethylene (hereinafter sometimes abbreviated as PE), unstretched polypropylene (hereinafter sometimes referred to as CPP), and stretched polypropylene (hereinafter simply referred to as OPP). Sometimes), polyvinylidene chloride (hereinafter PV
DCDC), PVDC coating OPP (hereinafter sometimes referred to as KOP), polyethylene terephthalate (hereinafter sometimes referred to as PET), stretched nylon (hereinafter, referred to as It may be abbreviated as ON), and PET for coating PVDC (hereinafter referred to as KP)
ET), polyvinyl alcohol (hereinafter sometimes referred to as PVA), polyvinyl chloride (hereinafter sometimes referred to as PVC) and ethylene-vinyl acetate copolymer (hereinafter, referred to as “ET”). It is practical to use by laminating two or more kinds of plastic sheets such as EVA (which may be abbreviated as EVA).

In the composite plastic sheet, the innermost layer is heated.
Those formed of plastic sheets that can be sealed are suitable for use.

Although the term "sheet" is a polysemous word, it is used in the present invention to include the meaning of "film".

Therefore, the term "sheet" of the present invention is used in the sense of including a significantly thin sheet in terms of thickness. The sheet can be thick.

The packaging bag of the present invention may have any shape, size, shape and others.

From the point of view of classification of the packaging bag from the heat seal, the packaging bag can be any packaging bag, for example, a side seal bag, a body seal bag and an inflation tube. It may be any of the bags.

The side seal bag may be either a two-way seal bag or a three-way seal bag,
The trunk seal bag may also be, for example, a gassho seal bag or an envelope sticking bag.

As the packaging bag of a special form, for example, a gusset bag having four sided seals, a self-standing bag having bottom plates stuck together, a double bag having a seal at the center of the bag, a double bag having a partition plate adhered thereto, etc. Can be used.

From the viewpoint of classification of the packaging bag, it may be either a flat bag or a three-dimensional bag, and the three-dimensional bag may be a self-supporting type or a non-self-supporting type.

From the viewpoint of a special combination of the shape and the heat seal, for example, a three-sided seal flat bag and a gassho seal are used.
The flat bag and the seal-filled gazette bag are convenient for practical use.

The packaging bag of the present invention, as long as the article to be packaged is a liquid or a liquid coexisting substance, industrial packaging (packing mainly for transporting and storing the article), commercial packaging (commercial transaction mainly for retail) Mainly used for packaging), transport packaging (packaging applied to goods for the purpose of transportation), consumer packaging (packaging applied to goods for delivery to consumers) or pre-packaging (protection of goods and value of packaged goods). For the purpose of improving the above) and any other purpose.

According to the packaging bag of the present invention, oxygen can be removed within an extremely short time, or oxygen can be removed within a desired time, so that deterioration of quality derived from oxygen can be prevented. become able to.

For that reason, somehow the purpose of the packaging
Nevertheless, the packaging bag of the present invention can be used. <Gas permeable membrane> In the packaging bag according to the present invention,
Both are restricted in polarity, crystallinity and crystallinity
Sheets made of plastic have a specific range of air permeability
Preservative storage area with gas permeable membrane as boundary
Are formed. Gas permeable membrane plastic The plastic used for the gas permeable membrane is the plastic used in the present invention.
If it is good for empirical examination, it will be non-polar or small in polarity,
Crystallinity is about 80% or less (from the aspect of strength, the crystallinity is
About 60% or more) or non-crystalline one is suitable
ing.

From the viewpoint of transporting oxygen molecules when the oxygen molecules on the liquid side are transported through the gas permeable membrane and diffused to the gas side, the plastic has such polarity, crystallinity and crystallinity. , The transport rate of oxygen molecules (diffusion rate,
It has been found in the present invention that a gas permeable membrane having a remarkably large moving speed) and capable of realizing a desired transport speed of oxygen molecules by changing the area or the like can be obtained.

In principle, the plastic may be either a homopolymer or a copolymer as long as it has such physical properties and molecular structure. For example, low density polyethylene (typically high-pressure polyethylene) and polyolefin such as polypropylene can be used.

Low-density polyethylene is a crystalline polymer (meaning a polymer having a crystal part), and the crystal part has various elements (very roughly, crystal structure, crystal arrangement,
It is known that the physical properties of the low-density polyethylene change minutely depending on the shape of the single crystal and the amorphous structure.

The low-density polyethylene has a crystallinity of about 60 to about 80%, preferably about 60 to about 75.
% Is suitable for use. The crystallinity is
It has been found in the present invention that the removal rate of oxygen from a liquid or the like can be prevented from decreasing if the area of the gas permeable membrane is large, even at about 80%. Since low-density polyethylene does not contain a polar group in the polymer chain, it is generally apolar or has a small polarity. Gas Permeable Membrane The gas permeable membrane of the present invention is made of a plastic sheet having such physical properties as a porous sheet having an air permeability of 100 to 1,300 seconds / 100 ml measured by JIS-P-8117. The thing is typical.

The air permeability is 100 to 1,300 seconds / 100.
It can be in the milliliter range, but is preferably 20
It is 0 to 1,000 seconds / 100 milliliters, particularly preferably 200 to 800 seconds / 100 milliliters.

When the air permeability is less than 100 seconds / 100 ml, the aperture ratio becomes large, which leads to a decrease in the mechanical strength of the gas permeable membrane itself.
This is because if it exceeds 0 sec / 100 ml, the deoxidization rate tends to decrease.

Plastic (typically polyolefin)
The porosity generation method using the gas permeable membrane can be any method according to the sheet generation method. A typical method of producing a plastic sheet is a method of directly forming a sheet from plastic, but a sheet-like material (typically a non-woven fabric) may be formed from plastic fibers.

When the gas permeable membrane is made of polyolefin sheet, its average thickness (measured by JIS-P-8118) is, for example, 30 to 200 μ, preferably 20 to.
150μ, particularly preferably 20-100μ,
The basis weight is, for example, 20 to 200 g / m ² , preferably 3
It is 0 to 100 g / m ² . It has been found in the present invention that a gas permeable membrane of a polyolefin sheet under such conditions can easily remove oxygen in a short time.

The gas permeable membrane typically forms the whole or a part of the boundary surface of the preservative storage area by itself, but the gas permeable membrane is used as another material, for example, a mesh sheet.
Preservative storage area is formed by using the whole or part of the composite sheet-like material of gas permeable membrane laminated on sheet-like material, non-woven fabric, perforated sheet-like material or void sheet-like material It is also possible to do so.

The composite sheet-like material having a laminated gas permeable membrane is formed by laminating a gas permeable membrane of polyolefin sheet on another material.
It is convenient to form it by means such as G.

In the composite sheet-like material having a laminated gas permeable film, the aperture ratio of the gas permeable film itself is lowered by laminating other materials, and the air permeability is larger than 1,300 seconds / 100 ml. May be numerical (ie, reduced air permeability).

However, if the gas permeability of the gas permeable membrane itself is within the range of the present invention, it is possible to remove oxygen and to form a composite sheet of gas permeable membrane laminate. It is possible to enjoy advantages such as an increase in mechanical strength due to.

It has been found in the present invention that the transport rate when transporting oxygen molecules of a liquid substance or a liquid substance coexistent through the gas permeable membrane to the oxygen scavenger side is significantly affected by the area of the gas permeable membrane. (See Experimental Example 3 in Examples below).

By making the area of the gas permeable membrane about 4/3 or more, preferably the same as the external area of one of the packaging bags (either the front or the back in the case of a flat bag). It has been found in the present invention that the coexisting oxygen amount of the liquid substance or the liquid substance coexisting substance can be remarkably reduced within 44 hours (see Experimental Example 3 in Examples described later). <Preservative Storage Area> In the present invention, a preservative storage area having a gas permeable membrane as a boundary surface is provided in a gas impermeable packaging bag. The boundary surface between the preservative storage area and the article in the packaging bag is typically entirely formed by a gas permeable film, but the boundary surface is partially formed by a gas permeable film. Good.

The area and thickness of the gas permeable membrane can be determined in relation to the rate of deoxidation. That is, as long as the gas permeable film has at least the characteristics defined in the present invention, most of the oxygen existing in the liquid or the liquid coexisting substance in a package of any size is within a very short time ( For example, it is experimentally found in the present invention that it can be removed within 44 hours and can be captured by an oxygen scavenger. <Article> In the packaging bag according to the present invention, a liquid article or an article coexisting with a liquid article is stored in the article storage area.

The liquid substance is typically a liquid, but may be a so-called semi-liquid or a liquid. Therefore, the liquid material can be in the form of a sol or a gel. An article in which a liquid substance coexists is a substance in which a liquid substance and a substance other than the liquid substance (typically, a solid substance) coexist.

Specific examples of the liquid article include foods, industrial products, pharmaceuticals, cosmetics and quasi-drugs, and foods are typical. Examples of liquid foods include various juices. <Specific Example of Packaging Bag> Next, a packaging bag according to the present invention will be described with reference to FIGS.
A specific description will be given based on the specific example shown in FIG. Figure 1
Although the embodiment shown in FIG. 5 shows a preferred embodiment of the present invention, it is a part of many embodiments included in the present invention. 1 is a plan view of a specific example of the packaging bag of the present invention, and FIG. 2 is a perspective view showing a state in which the mouth portion of the packaging bag of FIG. 1 is opened.

In the packaging bag shown in FIGS. 1 and 2, the outer side of the packaging bag 1 is formed by the gas barrier composite sheets 2 and 2 so that gas and the like cannot enter the packaging bag 1 from the outside. Has become.

The packaging bag 1 is a composite sheet having a gas barrier property in width.
Although the same as the sheets 2 and 2, but the length is slightly shorter than that of the composite sheets 2 and 2, a porous low-density polyethylene sheet 3 is sandwiched between the composite sheets 2 and 4 and placed at four positions. The ends 4, 4,
It is a heat seal of Nos. 5 and 6 (sometimes called a heat seal part). However, the heat seal portion 5 is heat shielded only on the inner surface of one of the composite sheets 2.

The packaging bag 1 is provided with a storage area 6 for articles by the porous low-density polyethylene 3 and a preservative storage area 7 having a volume slightly smaller than that. The mouth portion 8 and the bottom portion 9 of the packaging bag 1 are also heat-sensitive.
Has been

In addition, when the preservative storage area 7 contains an oxygen scavenger (not shown), when an article composed of a liquid or a liquid coexisting material is stored in the article storage area 6, The oxygen present in these articles can be trapped and removed by the oxygen scavenger through the porous low density polyethylene sheet 3.

FIG. 3 is a plan view of another embodiment of the packaging bag of the present invention, and FIG. 4 is a perspective view showing a state where the mouth of the packaging bag of FIG. 3 is opened.

Similar to the packaging bag 1, the packaging bag 30 shown in FIGS. 3 and 4 is formed of gas barrier composite sheets 31 and 31 on the outer side so that gas and the like cannot enter the packaging bag 30 from the outside. It has become.

Near both ends of the packaging bag 30 in the lengthwise direction, the longitudinal end portions 33, 33 of the belt-shaped porous low-density polyethylene sheet 32 are attached to the inner surface of one composite sheet 31 only. Both ends in the width direction are sandwiched between the gas-barrier composite sheets 31, 31 and integrally heat-sealed. Therefore, in the packaging bag 30, a preservative storage area having a band-shaped gas permeable membrane as a boundary surface is formed in a substantially middle portion thereof, and at least a deoxidizer (not shown) is stored therein. ing.

FIG. 5 is also a perspective view showing another specific example of the packaging bag of the present invention.

The packaging bag 50 shown in FIG. 5 is also an upright type packaging bag formed with gas barrier composite sheets 51, 51 on the outside, and one of the inner surfaces has a small rectangular porous body. The ends of the low density polyethylene sheet are heat-sealed to form a preservative storage area bounded by a small rectangular gas permeable membrane, at least an oxygen scavenger (not shown). It is designed to be stored.

FIG. 6 is a scanning electron micrograph showing the surface of a gas permeable membrane made of a nonwoven fabric of polyolefin fibers. FIG. 7 is an enlarged schematic view showing a side surface of a porous low density polyethylene sheet obtained by a stretching method.

Porous Low Density Polyethylene Sheet by Stretching Method
The pores formed in the sheet have a complicated morphology, which is one of the causes of the complicated behavior of oxygen molecules that permeate the porous low density polyethylene sheet.

It should be noted that any modification or partial modification or addition is optional, as long as it is a purpose of the present invention and does not particularly impair the effects of the present invention, and all are within the scope of the present invention.

Next, the present invention will be described in more detail based on examples, but the examples are illustrative and do not limit the present invention.

[0082]

【Example】

<Experimental Example 1> A pouch formed of a gas permeable membrane (that is,
A package (180 mm x 270 mm) in which a pocket-shaped preservative storage area is formed by a three-layer composite plastic sheet.
The test bags (A) and (B) provided inside were prepared.

The test bags (A) and (B) are both
A pouch was formed of the gas permeable membrane having the specifications described below. The shape of the test bags (A) and (B) is similar to the packaging bag shown in FIGS. 1 and 2, and is 180 mm (width) × 170.
A gas permeable membrane of mm (length) was provided.

The gas permeable membrane has a crystallinity of about 65-70.
A porous low-density polyethylene sheet was used which was made by pouring a low-density polyethylene of about 10% into a sheet by a stretching method. Porous low density polyethylene sheet has a basis weight of 73g
/ M ² , average thickness (measured according to JIS-P-8118)
Of 60 μ, 40 ° C., 90% RH, moisture permeability by lissi method of 5,500 g / m ² · 24 h, and air permeability (measured by JIS-P-8117) of 400 seconds / 10
The maximum pore diameter (measured by ASTM-F310) was 0.9 μm at 0 ml. <Experimental Example 2> An experiment for deoxidation was performed using the test bags (A) and (B) prepared in Experimental Example 1. First, 4 at room temperature
400 ml of ion-exchange treated water that has been aerated for more than an hour is placed in the test bags (A) and (B),
After inserting the oxygen scavenger into the small bags of the test bags (A) and (B), remove the air as much as possible, and then test bags (A) and (B)
The mouth was heat-sealed and sealed.

After that, the test bags (A) and (B) were stored at room temperature, and the change with time of dissolved oxygen in the ion-exchange treated water in the test bag was measured.

Table 1 below shows the measurement results.

[0087]

[Table 1] According to the measurement result of Table 1, the dissolved oxygen amount of the ion-exchange treated water decreased in a short time. <Experimental Example 3> An inside of a package (180 mm x 270 mm) formed by a composite plastic sheet is divided into two by a gas permeable membrane having the same area (180 mm x 270 mm) to form an article storage area and a preservative storage area. The above-mentioned test package was prepared.

Next, the dissolved oxygen amount of 9 p is stored in the article storage area.
pm of tap water was stored, the deoxidizer was stored in the preservative storage area, the mouth of the test package was heat-sealed and left to stand, and the change with time of the dissolved oxygen content was measured.

Then, the same measurement was carried out using three types of test packages in which the area of the gas permeable membrane was changed.

Table 2 below shows the measurement results. In addition, the gas permeable membrane area of the entire surface in the gas permeable membrane area in Table 2 is the package plane area (180 mm × 270 m).
m) is almost the same. The numerical value of 1/4 means the area of 1/4 of the entire surface.

[0091]

[Table 2] According to the measurement results in Table 2, a correlation was observed between the gas permeable membrane area and the decrease in the dissolved oxygen amount with time. <Experimental Example 4> In the state of dissolved oxygen of 9 ppm, the article coexisting with the liquid substance, which can be stored for about one day at the limit, is preserved in the test bag of Experimental Example 1 while maintaining the original quality. I measured the possible period.

According to the measurement results, it was found that even when the oxygen absorber is small, if it is preserved in a test bag containing the oxygen absorber, a preservation period of at least about 7 times can be maintained. <Experimental Example 5> An experiment similar to Experimental Example 2 was conducted using another porous low-density polyethylene sheet having an air permeability in the range of 100 to 1,300 seconds / 100 ml.
The results were almost the same. <Experimental Example 6> The same experiment was conducted using a porous polypropylene sheet which was made porous by a stretching method. According to this, the same result as that of the porous low density polyethylene sheet was obtained.

[0093]

According to the packaging bag of the present invention, the following effects can be obtained. (A) Oxygen can be removed from a liquid article or an article coexisting with a liquid in a desired short time, and oxygen that directly or indirectly causes deterioration of food quality is removed in a short time. It becomes possible to do. (B) Liquid products or products coexisting with liquid products can be maintained in an oxygen-free environment, so they can be used for packaging for any purpose, and the conditions for using packaging bags can be greatly changed. Becomes

For example, even if the food is packaged for a long time, the quality is not deteriorated, or even if it is irradiated with ultraviolet rays, the quality is not deteriorated in the absence of oxygen. The range of conditions of use is expanded. (C) Since oxygen can be removed under desired conditions (for example, at a desired time), it becomes possible to provide a packaging bag having an oxygen removing function depending on the generation status of oxygen from the food itself.

[Brief description of drawings]

FIG. 1 is a plan view of a specific example of a packaging bag of the present invention.

FIG. 2 is a perspective view showing a state in which a mouth portion of the packaging bag shown in FIG. 1 is opened.

FIG. 3 is a plan view of another specific example of the packaging bag of the present invention.

FIG. 4 is a perspective view showing a state in which a mouth of the packaging bag shown in FIG. 3 is opened.

FIG. 5 is a perspective view showing another specific example of the packaging bag of the present invention.

FIG. 6 is an enlarged view of the surface of a nonwoven fabric of polyolefin fiber.

FIG. 7 is a schematic view showing an enlarged side surface of a porous low density polyethylene sheet.

FIG. 8 is a vertical sectional view of a conventional packaging bag.

FIG. 9 is a vertical sectional view of a conventional packaging bag.

FIG. 10 is a perspective view of a conventional large bag.

[Explanation of symbols]

 1 Packaging Bag 2 Gas Barrier Composite Sheet 3 Porous Low Density Polyethylene Sheet 7 Article Storage Area 8 Preservative Storage Area 30 Packaging Bag 31 Gas Barrier Composite Sheet 32 Strip-shaped Porous Low Density Polyethylene Sheet 50 Packaging Bag 51 Gas barrier composite sheet

Claims (3)

[Claims] 1. A packaging bag formed of a gas barrier plastic sheet, the interior of which is provided with a preservative storage area and an article storage area by a boundary surface having a gas permeable membrane defined below. The preservative storage area stores at least an oxygen scavenger, and the article storage area stores a liquid product or a liquid coexisting product. Packaging bag. Gas Permeable Membrane The gas permeable membrane is a non-polar or small-polarity, sheet-like material formed of plastic having a crystallinity of about 80% or less or amorphous, and further JIS-P-
Air permeability measured by 8117 is 100 to 1,300
Seconds / 100 ml. 2. The package according to claim 1, wherein the gas permeable membrane is a homopolymer or copolymer of polyolefin and is a non-polar or low-polarity physical sheet. bag. 3. The gas permeable membrane has an average thickness (JIS-P-8
The measurement according to 118) is 30 to 200 μ, and the basis weight is 20 to 200 g / m ^2.
Or the packaging bag according to 2.