JPH10250774A - Liquid-absorptive package - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively absorb only liquid oozing from food without excessively drying the food, by putting a liquid-absorptive layer in the inside face of a bag body made of a liquid-impermeable film and connecting it to a liquid- preventive layer and forming a liquid-passage at the peripheral edge of the liquid-preventive layer to conduct the liquid to the liquid-absorptive layer. SOLUTION: In a liquid-absorptive package 1 absorbing liquid oozed from food such as fish or meat, a liquid-preventive layer 4 holding the liquid- absorptive layer 3 and regulating permeatition of liquid is stuck on the inside face of the bag body 2 made of a liquid-impermeable film, at the side 7 thereof. And a liquid-passage 5 is formed at the peripheral edge of the liquid-preventive layer 4. On packaging food, a food F such as meat is contained and the openings 6, 6 are heat-sealed. And the food F is packaged in the state that one side face thereof contacts the liquid-preventive layer 4. In this time, when liquid oozes out of the food F, most of the oozed liquid flows on the liquid-preventive layer 4 and reaches the passage 5 and it is led to the liquid-absorptive layer 3 through the liquid-passage 5 and absorbed in the absorptive layer 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-absorbent wrapper capable of appropriately absorbing sap exuding from foods such as fish, meat and vegetables to maintain the freshness of these foods during storage and transportation. About.

[0002]

2. Description of the Related Art Fresh foods such as fresh fish and meat are often stored in wrappers and vacuum-packed or air-packed. However, if stored and transported in this state, sap called a drip oozes out of the wrapper, and the quality may deteriorate such as discoloration of the food in contact with the sap. In order to prevent quality deterioration due to swelling of sap, it is necessary to promptly remove the squirting sap. As a means for achieving this, a method is known in which a liquid absorbing material that can be brought into contact with food to absorb liquid juice is enclosed in a wrapper together with the food.

For example, in Japanese Patent Application Laid-Open No. 02-032977, as shown in FIG. 7, a liquid absorbing layer 21 is disposed in a wrapper 20 and a plurality of small holes 22 are formed on the surface of this layer. A method has been proposed in which the food is covered with a porous sheet 23 and food is placed on the porous sheet 23 and packaged. In addition, JP
No. 4,079,834 discloses a liquid absorbing layer in which a polymer absorbent is sandwiched between two liquid-permeable sheets carrying a humidity control agent on the inner surface of a wrapper made of an oxygen barrier film. There has been proposed a laminate packaging material for meat, which is covered with a liquid-permeable sheet made of a nonwoven fabric or a porous sheet.

[0004]

In a wrapper having a built-in liquid-absorbent layer, a liquid-permeable sheet covering the surface of the liquid-absorbent layer is brought into contact with food such as meat, and the liquid spill that exudes from the liquid-permeable sheet. It is intended to prevent the deterioration of food quality by absorbing into the liquid absorbing layer through the small holes, but due to the strong absorbing power of the liquid absorbing layer, it is contained not only in the exuded liquid juice but also in the food normally. There is a problem that the food is dried or cured by contact for a long time by absorbing up to a certain amount of moisture. There is also a problem that the interface between the food and the liquid-permeable sheet is stuck due to the absorbing power of the liquid-absorbing layer, making peeling difficult.

As a means for solving this problem, for example, Japanese Patent Publication No. 05-083214 discloses that a liquid absorbing layer 31 is sandwiched between a liquid permeable sheet 32 and a non-liquid permeable sheet 33 as shown in FIG. The liquid absorbing inner bag 34 is disposed in such a manner that the non-liquid permeable sheet 33 is in contact with the food F and sealed in the wrapping bag 30, and sap leached from the food F is passed through the liquid permeable sheet 3 of the liquid absorbing inner bag 34.
A method of absorbing from the side 2 has been proposed. JP-A-07-257657 discloses that one surface is formed of a liquid-permeable sheet such as a nonwoven fabric and the other surface has a hole diameter of 0.05 mm to 0.5 mm and an aperture ratio of 0.05 to 0.5 mm. The inner bag for absorbing liquid, which is made of a semi-permeable sheet of 0.01% to 0.4% and has a liquid-absorbing layer sandwiched between the two sheets, contacts the side of the semi-permeable sheet with food. There has been proposed a method of packing the components.

According to any of these methods, since the surface of the inner bag for liquid absorption that comes into contact with the food is impermeable or semi-permeable, the problem of drying the food and the peeling due to the suction force are caused. Although the difficult problem is solved, care should be taken when packaging the food and the inner bag for liquid absorption so that the liquid-permeable or semi-permeable surface of the inner bag for liquid absorption comes into contact with the food. In addition to the fact that it is necessary to enclose the food in the wrapper, the packaging work becomes complicated and the packaging cost increases. In some cases, it was difficult to use. The present invention has been made in order to solve the above-mentioned problems, and therefore, has as its object to easily store and transport these foods by easily packaging and appropriately absorbing sap exuding from foods. An object of the present invention is to provide a liquid-absorbent wrapper that can maintain freshness at the time.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a liquid-impermeable film having a liquid absorbing layer sandwiched between inner surfaces of a bag main body made of a liquid-impermeable film to absorb the liquid juice. The present invention provides a liquid-absorbent wrapper in which a liquid-controlling layer to be restricted is joined, and a liquid passage for guiding liquid juice to the liquid-absorbing layer is formed in a peripheral portion of the liquid-controlling layer. In the above, the liquid absorbing layer is preferably made of a composite of a liquid permeable sheet and a polymer water absorbing agent. In the above, it is preferable that the liquid control layer is formed of a liquid impermeable film or a semipermeable film that restricts the transmission of liquid juice. In the above, the liquid passage is formed by cutting off the peripheral part of the liquid control layer, the gap between the inner surface of the wrapper and the peripheral part of the liquid control layer, and / or between the inner surface of the bag body and the peripheral part of the liquid control layer. It is preferable to be formed by the sandwiched liquid-permeable sheet.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention will be described below with reference to the accompanying drawings. (Embodiment 1) FIG. 1 shows an embodiment of the absorbent bag of the present invention. In FIG. 1, the liquid-absorbent wrapping bag 1 has a liquid-absorbing layer 3 for absorbing liquid juice, which is sandwiched on the inner surface of a bag main body 2 made of a liquid-impermeable film, and a liquid-controlling layer 4 for restricting liquid juice transmission. ,
A liquid passage 5 for guiding the liquid juice to the liquid absorbing layer 3 is formed at the periphery of the liquid control layer 4 by heat sealing at the side portions 7.

The liquid-absorbent wrapping bag 1 contains a food F such as meat, and if necessary, evacuates the inside of the bag body 2 and seals the opening 6-6 thereof by heat sealing or the like.
Is packaged with one side thereof in contact with the liquid control layer 4. In this state, when the liquid absorbing layer 3 is stored with the lower surface thereof being stored, even if the liquid juice oozes out of the food F during this time, most of the oozed liquid sap is completely or hardly penetrated by the liquid control layer. 4, the liquid flows to the liquid passage 5, is guided to the liquid absorbing layer 3 through the liquid flowing path 5, and is absorbed by the liquid absorbing layer 3.

[0010] With the use of the above-mentioned liquid-absorptive wrapping bag 1, the liquid exuded from the food F is immediately absorbed into the liquid-absorbing layer 3 via the liquid passage 5, so that the liquid exuded from the food F is in contact with the liquid exuded for a long time. Of the food is prevented from being deteriorated. Moreover, since the surface of the food F in direct contact with the liquid control layer 4 is not absorbed or dried or hardened due to excessive absorption of water in the food, and the food adheres to the liquid control layer 4. There is no difficulty in peeling. Further, since the liquid absorption layer 3 and the liquid control layer 4 are joined and fixed to the inner surface of the bag body 2, the food F may be simply put in a wrapper and sealed at the time of packaging. The trouble of installing the liquid sheet is eliminated, the production efficiency is increased, and the liquid is not displaced during transportation, so that a stable liquid absorption is always possible.

In order to manufacture the liquid-absorbent wrapping bag 1 of the first embodiment, the liquid-absorbing layer 3 is disposed on the developed liquid-impermeable film forming the bag body 2, and a liquid passage is formed thereon. After covering the liquid control layer 4 on which the liquid crystal layer 5 is formed, and joining the sides 7 thereof to a liquid impermeable film serving as a bag body by heat sealing or the like, the bag body 2
Is preferably formed. The opening 6 of the bag body 2 may be separated so as to be sealed by heat sealing or bonding, but an opening / closing member (fastener) by a fitting groove may be attached so that the bag can be easily opened and closed repeatedly. .

In the above liquid-absorbent wrapping bag 1, as the liquid-impermeable film forming the bag main body 2, any of liquid-impermeable films which are generally used for packaging foods and can be used. Preferably, a heat-sealing and transparent material, and more preferably, an oxygen-barrier material is used. Examples of suitable liquid impermeable films include, for example, polyethylene, polypropylene, ethylene / vinyl acetate copolymer,
A single-layer or laminated film of polyamide, polyester or the like having a thickness of 40 μm to 100 μm can be mentioned.

As the liquid absorbing layer 3, a laminated sheet in which a polymer water absorbing agent is sandwiched between two liquid-permeable sheets having continuous through holes is preferable. Examples of this liquid-permeable sheet include pulp,
Nonwoven fabric, paper, cotton cloth, hydrophilic sponge and the like can be mentioned. These liquid-permeable sheets themselves absorb liquid sap quickly by the capillary action of the continuous through-holes, store the liquid sap therein, and guide it toward the high-molecular-weight water-absorbing agent. As the polymer water-absorbing agent that can be used for the liquid-absorbing layer 3, any one generally used in this field can be used and is not particularly limited. The liquid absorbing capacity of the liquid absorbing layer 3 is appropriately 200 g / m ² or more as a drip liquid absorbing amount.

The liquid control layer 4 is preferably made of a liquid impermeable film or a semipermeable film for restricting the permeation of liquid juice. When a liquid impermeable film is used, it is preferable that the material is made of the same material as the bag body 2 in consideration of heat sealing properties and the like. In the case of a semi-permeable film, a so-called semi-permeable membrane such as a collodion membrane can be used, but it is preferable to use a porous film in which liquid-impermeable films are formed with openings having an appropriate pore size and an appropriate opening ratio. .

As an example of a suitable semipermeable film, the pore diameter is in the range of 0.05 mm to 0.5 mm, and the aperture ratio is 0.0
Within the range of 1% to 0.4%, a porous film having heat sealing properties can be mentioned. This semi-permeable film does not have a suction force to absorb the moisture inside the food, so that it does not dry the food, but absorbs the liquid juice remaining in the concave portion at the interface between the food F and the liquid control layer 4, and discolors the food. prevent.

The liquid control layer 4 encloses the liquid absorbing layer 3, and its side 7 is joined to the inner surface of the bag body 2 by heat sealing. The side 7 of the liquid control layer and the inner surface of the bag body 2 may be directly heat-sealed with the liquid absorbing layer 3 included therein, or the hot melt adhesive may be interposed between the sides of the liquid absorbing layer 3. It may be joined by such as.

The liquid passage 5 is formed at a peripheral portion of the liquid control layer 4, preferably at a position where it does not come into direct contact with food packed in the bag body 2. In the first embodiment, the shape of the liquid passage 5 is a plurality of circular cutouts formed on the periphery of the liquid control layer 4 as shown in FIG. However, in the present invention, the shape of the liquid passage is not particularly limited. Examples in which the shape of the liquid passage is different will be described in the following examples.

(Embodiment 2) In this embodiment, as shown in FIG. 3, a plurality of wedge-shaped cutouts 5 are formed on the periphery of the liquid control layer 4, and the side 7 of the liquid control layer 4 is Heat-sealed to the main body 2. In this embodiment, the wedge-shaped notches 5 form liquid passages 5 for guiding the liquid juice to the liquid absorbing layer 3.

Embodiment 3 In this embodiment, as shown in FIG. 4, the side 7 of the liquid control layer is spot-joined to the bag body 2 at intermittent joining points 8. In this case, the gap between the adjacent junction points 8 serves as the liquid passage 5, and guides the liquid leached from the food F placed on the liquid control layer 4 to the contained liquid absorbing layer 3. In order to increase the opening degree of the liquid passage 5, if necessary, at least the peripheral portion of the liquid control layer 4 may be subjected to, for example, corrugated embossing. As a result, the space between the joints 8, 8 adjacent to each other is opened, the opening degree of the liquid passage 5 is increased, and the liquid permeability is improved.

(Embodiment 4) In this embodiment, as shown in FIG. 5, between the side portion 7 of the liquid control layer 4 and the inner surface of the bag body 2,
A band 9 made of fiber or sponge having continuous holes is joined in a frame shape with a hot melt adhesive or the like, and the liquid absorbing layer 3 is accommodated inside the band 9. In this case, since the band body 9 is liquid-permeable, it becomes the liquid passage 5, and the sap oozing from the food (not shown) on the liquid control layer 4 flows on the liquid control layer 4 to form a band at the peripheral edge thereof. It is guided to the liquid absorbing layer 3 through the body 9.

(Embodiment 5) This absorbent bag 10 is a modification of the embodiment 4, and as shown in FIG. 6, a liquid-permeating layer 4 and a liquid-permeation made of fibers or sponges having continuous holes. The liquid absorbing layer 3 is enclosed in an inner bag formed by joining the permeable sheets 11 to each other at the sides, and the liquid permeable sheet 11 side is spotted on the inner surface of the bag body 2 by a hot melt adhesive 13 or the like. Are joined.

In this absorbent bag 10, sap oozing from food (not shown) on the liquid control layer 4 flows on the liquid control layer 4 and wraps around from the periphery to the liquid permeable sheet 11 side. ,
The liquid permeable sheet 11 is guided to the liquid absorbing layer 3 as a liquid passage. In this case, since almost the entire surface of the liquid permeable sheet 11 is a liquid passage, the exuded liquid can be quickly absorbed by the liquid absorbing layer 3 without absorbing extra moisture from the food. In addition, the liquid-absorbent wrapping bag 10 is simple because the liquid-absorbing inner bag 12 prepared in advance may be spot-joined to the inner surface of the bag body 2 at the time of manufacture.

In each of the above embodiments, the liquid absorbing layer 3 is provided only on one side of the inner surface of the bag body 2. However, it is needless to say that the present invention also includes those provided on both sides of the inner surface. Further, the size of the liquid control layer 4 and the liquid absorbing layer 3 may be such that they cover substantially the entirety of one side of the inner surface of the bag body 2, or may be such that they cover the inner surface part depending on the shape of the food or packaging.

(Evaluation Test) An evaluation test was performed on the liquid-absorbent zipper of each of the above Examples. The evaluation was carried out by placing about 1500 g of beef thigh in a sample of each liquid-absorbent wrapper, vacuum-packing the food, storing it in a refrigerator for 3 weeks, and confirming the state of the food (whether drying or discoloration was observed) and absorption of the exuded juice. Properties (absorption%), peelability between food and film surface, workability during packaging, misalignment between food and liquid-absorbing surface, leakage of polymer absorbent (leakage of powder), and production cost and encapsulation processing of wrapper Packaging costs, including wages, were evaluated on a four-point scale of ◎, ○, △, ×.

In each embodiment, the bag body 2 is made of a nylon / polyethylene laminated film and has a size of 33c.
m × 23 cm was used. The liquid-absorbing layer 3 contained a polymer water-absorbing agent of 100 g / m ² and pulp of 40 g / m ² and had a size of 24 cm × 19 cm. The liquid control layer 4 was formed by forming an opening having a hole diameter of 200 μm on an LLDPE film having a thickness of 34 μm so as to have an opening ratio of 0.015%.

Regarding the sample of each embodiment, the sample of the embodiment 2 (FIG. 3) has a wedge-shaped notch having a depth of 5 mm formed at a side portion 7 of the liquid control layer 4 at intervals of 1 mm. Formed. In the sample of Example 3 (FIG. 4), the side 7 of the liquid
At an interval of mm, spot welding was performed on the inner surface of the bag body 2 using an ultrasonic welder. The liquid control layer 4 was embossed in order to increase the opening degree of the liquid passage 5 formed between the adjacent spot welding points 8. In the sample of Example 4 (FIG. 5), a wet nonwoven fabric made of polyolefin having a basis weight of 30 g / m ² (HOP30H manufactured by Hirose Paper Co., Ltd.) was used as the band 9. For the sample of Example 5 (FIG. 6), a wet nonwoven fabric made of polyolefin having a basis weight of 30 g / m ² (HOP30H manufactured by Hirose Paper Co., Ltd.) was used as the liquid-permeable sheet 11.

(Comparative Example) For comparison, the following liquid-absorbent wrapper having the same dimensions as the sample of the above example was prepared according to a conventionally proposed method, and the same evaluation test as in the example was performed. .
In each of the following comparative examples, the configuration and dimensions of the liquid absorbing layer are the same as those of the sample of the example.

Comparative Example 1: In the configuration shown in FIG. 7, the porous sheet 23 which comes into contact with food is made of a wet nonwoven fabric made of polyolefin having a basis weight of 30 g / m ² (HOP30 manufactured by Hirose Paper Co., Ltd.).
H) was used. Comparative Example 2: In the configuration shown in FIG. 8, a wet nonwoven fabric made of polyolefin having a basis weight of 30 g / m ² (HOP30H manufactured by Hirose Paper Co., Ltd.) was used for the liquid-permeable sheet 32 that does not come into contact with food. Comparative Example 3: In the configuration shown in FIG. 7, the porous sheet 23 that comes into contact with food has a small hole 22 having a hole diameter of 1 mm and an opening ratio of 30%.
.. Were formed, and the sides thereof were heat-sealed to the wrapper 20. Comparative Example 4: In the configuration shown in FIG. 7, the porous sheet 23 in contact with the food is a porous polyethylene film in which small holes 22 having a hole diameter of 0.2 mm and an opening ratio of 0.2% are formed. The part was heat-sealed to the wrapper 20. Table 1 shows the evaluation results of the above Examples and Comparative Examples.

[0029]

[Table 1]

From the results shown in Table 1, all of the samples of Examples 2, 3, 4 and 5 showed good food conditions after 3 weeks of refrigeration without any drying or discoloration, and the absorption of exudate juice was good. 7% ~
10%, which is moderate, the peelability between the food and the film surface is good, and the workability at the time of packaging is simple since the food can be sealed by putting it in a wrapper, There is no deviation since the liquid absorbing layer is fixed, no leakage of the polymer absorbent (powder leakage) is recognized, and the packaging cost including the packaging bag production cost and the encapsulation processing fee is Examples 2 and 3 are inexpensive, and in Examples 4 and 5, although the cost of producing the wrapper is slightly increased, the encapsulation processing fee is low and the total packaging cost is not a problem.

On the other hand, in the case of the comparative example, the comparative example 1
Since the surface that comes into contact with the food is a nonwoven fabric, it absorbs too much moisture and the food becomes dry, and there is a problem that the suction force of the liquid absorbing layer directly affects the food, resulting in poor peelability. Comparative Example 2
However, since the inner bag for absorbing liquid is separated from the bag body, the packaging operation is complicated, so that the packaging cost is increased, and deviation from food is liable to occur. Comparative Example 3 has a hole diameter of 1 mm and an opening ratio of 30.
% Of the porous film is in contact with the food, so it absorbs too much water and the food becomes slightly dry and has poor peelability.
And powder leakage was observed. In Comparative Example 4, since a porous sheet having both a small pore size and a small opening ratio was used, the absorption amount of sap was insufficient, and discoloration was observed in the food.

[0032]

According to the liquid-absorbent wrapper of the present invention, a liquid-absorbing layer that absorbs liquid juice is sandwiched on the inner surface of the bag body made of a liquid-impermeable film to restrict the liquid permeation. Since the liquid passage is formed at the periphery of the liquid control layer to guide the liquid juice to the liquid absorbing layer, only the liquid liquid exuded without excessively drying the food is effectively absorbed. In addition, discoloration of the food is prevented, the packaging operation is simple, and there is no problem of liquid absorption due to displacement of the liquid absorption layer, and the freshness of the food can be maintained for a long time at low packaging cost.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of a liquid-absorbent wrapping bag of the present invention.

FIG. 2 is a partial plan view of the absorbent bag of FIG.

FIG. 3 is a partial plan view of another embodiment of the present invention.

FIG. 4 is a partial plan view of still another embodiment of the present invention.

FIG. 5 is a step-cut perspective view of still another embodiment of the present invention.

FIG. 6 is a sectional view of still another embodiment of the present invention.

FIG. 7 is a cross-sectional view showing an example of a conventionally proposed liquid-absorbent wrapper.

FIG. 8 is a cross-sectional view showing an example of another liquid-absorbing wrapper conventionally proposed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Liquid-absorbent wrapping bag, 2 ... Bag body, 3 ... Liquid-absorbing layer, 4 ... Liquid-control layer, 5 ... Liquid passage, 6 ... Opening, 7 ... Liquid-control-layer side part (heat seal part), 8 ... Junction point, 9 ... Band having continuous through holes, F ... Food.

Claims (6)

[Claims] 1. A liquid-absorbing layer that absorbs liquid juice is sandwiched on the inner surface of a bag main body made of a liquid-impermeable film, and a liquid-control layer that restricts liquid permeation is joined to the bag body. , A liquid-absorbent wrapper formed with a liquid passage for guiding a sap to a liquid-absorbing layer. 2. The liquid-absorbent wrapper according to claim 1, wherein the liquid-absorbent layer comprises a composite of a liquid-permeable sheet and a polymer water-absorbing agent. 3. The absorbent bag according to claim 1, wherein the liquid control layer comprises a liquid impermeable film or a semipermeable film that restricts the permeation of liquid juice. 4. The liquid-absorbent wrapper according to claim 1, wherein the liquid passage is formed by a notch in a peripheral portion of the liquid control layer. 5. The liquid-absorbent wrapper according to claim 1, wherein the liquid passage is formed by a gap between the inner surface of the bag main body and a peripheral edge of the liquid control layer. 6. The liquid-absorbent wrapper according to claim 1, wherein the liquid passage is formed by a liquid-permeable sheet sandwiched between an inner surface of the bag body and a peripheral portion of the liquid control layer.