JP2011000082A - Food freshness-retaining tool - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the retaining of freshness of a food, etc., stably for a long period of time by forming a packaging cover with a film having alcohol permeability and heat-sealing property.SOLUTION: This packaging cover 3 covering an adsorbent 2 from its outside is formed by sealing the peripheral parts 4A of upper and lower 2 pieces of laminated films 4 in an overlapped state with each other over their four sides. The laminated films 4 are formed by the film consisting of a soft polyester resin material equipped both with the alcohol permeability and heat-sealability, and constituted by a transparent or semi-transparent film body 5 allowing the permeation of a freshness-retaining liquid in a gasified state and preventing the permeation as the liquid, and a printed layer 6 formed at the inside surface of the film body 5. The cover is made as securing the strength as the packaging cover 3 of the freshness-retaining tool and improving the workability on printing without using a fluorine compound which has the concerns on effects to a living body and an environment.

Description

  The present invention relates to an alcohol transpiration type food freshness retainer that is suitably used for storing foods such as foods and confectionery for a long period of time and maintaining their freshness.

  In general, it is known to use a food freshness holder of an alcohol transpiration type in order to maintain the freshness of food or other preserved items. Such food freshness holders are used by inserting one or a plurality of such food freshness holders into food packaging bodies such as foods and confectionery (for example, see Patent Document 1).

  This type of conventional food freshness holder is constituted by impregnating an adsorbent with a volatile freshness-maintaining liquid mainly composed of, for example, ethyl alcohol, and the adsorbent is made of, for example, natural pulp material. It is formed as a small flat plate having a rectangular shape.

  In addition, a film-like cover that covers such an adsorbent from the outside has a skirt portion that projects to the side of the adsorbent, and the freshness-retaining liquid gradually evaporates from the adsorbent to the outside. Thus, the volatilization opening is provided. And the freshness retention liquid in the said adsorption body gradually volatilizes in the food packaging body through the said volatilization opening from the skirt part of a cover. As a result, the freshness-retaining liquid fills the space (head space) in the food packaging body with a volatile gas (gasification atmosphere) and is adsorbed to the surface layer side for hydrophilic foods, for example, microorganisms such as mold Suppresses the growth of

  On the other hand, as another conventional technique, for example, a volatile freshness-maintaining liquid mainly composed of ethyl alcohol or the like is adsorbed on a large number of adsorbents made of powdered silica gel, and these adsorbents are stored in a film-like cover. Also known is a freshness holder configured as described above (for example, see Patent Document 2).

  Here, the film-like cover used in other prior arts is a Japanese paper treated with a fluorine-based water and oil repellent, and a resin material having alcohol permeability and heat sealability (for example, ethylene / vinyl acetate copolymer). It is comprised by the laminated film formed by laminating | stacking (laminate) the film body which consists of EVA resin which is. And this laminated film is configured so that its four sides (four sides) are sealed by heat sealing, preventing the adsorbent from protruding outside and preventing leakage of the freshness-retaining liquid. As a result, the volatile freshness-retaining liquid exhibits a freshness-retaining effect in the same manner as the prior art according to Patent Document 1 described above by gradually passing through the film body and gradually evaporating to the outside.

Japanese Patent No. 3159661 JP-A-60-149492

  By the way, the prior art by patent document 1 mentioned above is the structure which provides the opening for volatilization in the film-like cover which covers an adsorbent body from the outside, and volatilizes the freshness maintenance liquid in an adsorbent body gradually from the volatilization opening to the food packaging body. is there. However, for users such as consumers, such a volatilization opening may be misunderstood as a defective cover (opening due to a seal failure or damage), and further improvement is desired.

  In addition, when a food freshness holder is inserted into a food package such as confectionery and used, if a plurality of food packages are transported and transported in a stacked state, a large external force is applied to the food freshness holder in the middle. May act. Then, when the freshness-retaining liquid impregnated in the adsorbent body is subjected to the action of an external force, there is a possibility that the freshness-retaining liquid may ooze out from the volatilization opening in a liquid state. In addition, if the freshness-holding liquid oozes out into the food packaging while in a liquid state, the freshness-holding liquid in the adsorbent may be locally sucked toward the confectionery (food), thereby causing the food freshness. Not only the effect as a holding tool is lowered, but also the taste of food may be affected.

  Further, paper dust generated in, for example, a cutting process during production may remain on the adsorbent that adsorbs the freshness-keeping agent. And if such paper dust comes out from the volatilization opening of the film-like cover, users such as consumers may misunderstand it as a foreign object. There is a problem of causing a decrease in value.

  On the other hand, in the conventional freshness holder according to Patent Document 2, the film body of a film-like cover that covers the adsorbent body from the outside is formed using an EVA resin having alcohol permeability and heat sealability. However, a film body made of such an EVA resin has a problem that it cannot secure a sufficient strength as an exterior cover for a freshness holder and has poor workability during printing.

  For this reason, in the prior art disclosed in Patent Document 2, Japanese paper treated with a fluorine-based water and oil repellent is laminated on a film body made of EVA resin in order to make it possible to reinforce and print the film body made of EVA resin. It is set as the structure which becomes. In this case, the fluorine-based water and oil repellent is used to prevent the strength of the Japanese paper from being reduced by the Japanese paper absorbing the freshness retaining liquid or the moisture and oil contained in the food. Yes. Further, the fluorine-based water / oil repellent agent prevents the printing ink from coming into direct contact with food by covering the surface of the printed Japanese paper.

  However, it has been reported that such fluorine-based water and oil repellents are concerned about toxicity to the human body or accumulation in the environment. For this reason, the use of fluorine-based water and oil repellents is actually limited. That is, the conventional freshness holder according to Patent Document 2 is premised on the use of Japanese paper that has been treated with fluorine-based water and oil repellency.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to prevent the freshness-retaining liquid from exuding to the outside of the cover due to the action of an external force, etc. An object of the present invention is to provide a food freshness holder that can be stably held over a long period of time and can increase the commercial value.

  Another object of the present invention is to provide an outer packaging by using a film made of a resin material having both alcohol permeability and heat sealability, without using, for example, Japanese paper subjected to fluorine-based water / oil repellent treatment. An object of the present invention is to provide a food freshness holder capable of forming a cover.

  In order to solve the problems described above, the present invention comprises a freshness-preserving agent that retains the freshness of food or other preserved items, and a packaging cover that covers the freshness-preserving agent from the outside. The present invention is applied to a food freshness retainer comprising either a volatile freshness-maintaining liquid mainly composed of alcohol or an adsorbent adsorbed in an impregnated state.

A feature of the configuration adopted by the invention of claim 1 is that the packaging cover is formed by using a film made of a resin material having both alcohol permeability and heat sealability, and the freshness-retaining liquid is vaporized. And a transparent or translucent film body that prevents permeation in a liquid state, and a printed layer formed by printing on the inner surface of the film body, The gas permeability of the packaging cover that evaporates to the outside is adjusted to 170 to 1,650 (g / m ² · 24 hr) when the alcohol concentration of the freshness-holding liquid is in the range of 50 to 99 vol%. It is in that.

  Moreover, according to invention of Claim 2, it is set as the structure which provides a translucent nonwoven fabric layer in the outer surface of the said film body in the said packaging cover.

  Furthermore, according to the invention of claim 3, the film body is formed using a soft polyester resin material.

  As described above, according to the first aspect of the invention, the alcohol-permeable and heat-seal that prevents the permeation in the liquid state by allowing the freshness-retaining liquid to permeate the packaging cover that covers the freshness-retaining agent from the outside and prevents the permeation in the liquid state. And a printed layer formed on the inner surface of the film body. Thereby, the gas which volatilized and gasified from the freshness retention liquid impregnated in the adsorbent, for example, can permeate the film body (alcohol permeable film) of the packaging cover and volatilize outside. For this reason, the freshness-keeping liquid can be volatilized outside without specially providing a volatilization opening or the like as in the prior art, and a freshness-keeping effect on foods and the like can be exhibited.

  Even if a forced external force is applied to the adsorbent from the outside of the packaging cover, the freshness retaining liquid impregnated in the adsorbent does not permeate the film body in the liquid state. The freshness-keeping liquid can be stored and stored in an encapsulated state, and the freshness-keeping liquid can be prevented from exuding outside in the liquid state by a packaging cover made of a film body. Therefore, the freshness-retaining liquid impregnated in the adsorbent can be prevented from exuding to the outside due to the action of an external force, and the freshness of food and the like can be stably maintained for a long period of time.

  Moreover, by forming a transparent or translucent film body using a resin material that has both alcohol permeability and heat sealability, for example, a soft polyester resin (soft biodegradable resin material), the effect on the living body and the environment. Without using a fluorine compound that is a concern, sufficient strength as a packaging cover for a freshness holder can be ensured, and workability during printing can also be improved.

  In the invention of claim 2, since the translucent nonwoven fabric layer is provided on the outer surface of the film body constituting the packaging cover, the film body can be effectively reinforced by the nonwoven fabric layer. Moreover, the glossiness which exists in the outer surface of a film body can be suppressed from the outside with a translucent nonwoven fabric layer, and the appearance as a packaging cover can be improved. In addition, if the user misunderstands that the surface is wet due to the glossiness, this gives the impression that the internal freshness-holding liquid has oozed out of the packaging cover. However, by covering the outer surface of the film body with a translucent nonwoven fabric layer, the glossiness can be eliminated by the nonwoven fabric layer, and problems such as misunderstanding by the user can be eliminated.

  Furthermore, in the invention of claim 3, by forming the film body from a soft polyester resin material, the film body of the packaging cover can be provided with characteristics having both alcohol permeability and heat sealability. In addition to ensuring strength as an exterior cover, workability during printing can also be improved.

It is the perspective view which looked at the food freshness holder by the 1st Embodiment of this invention from diagonally upward. It is the top view which looked at the food freshness holder of FIG. 1 from the upper side. It is sectional drawing which expanded the food freshness holder from arrow III-III direction in FIG. It is a disassembled perspective view which shows the state before enveloping an adsorbent using two upper and lower laminated films. It is principal part sectional drawing which expanded the food freshness holder from the arrow VV direction in FIG. It is a characteristic diagram which shows the relationship between the alcohol density | concentration of freshness retention liquid, and the permeability | transmittance of gas. It is sectional drawing which expands and shows the food freshness holder by 2nd Embodiment. It is a disassembled perspective view which shows the state before wrapping an adsorption body from the upper direction using the laminated film by 2nd Embodiment. It is an expanded view which expands and shows the adhesive layer which consists of many strip | belt-shaped adhesive bond layers formed in the outer surface of a film body. It is the expanded sectional view which looked at the principal part of the food freshness holder from the arrow XX direction in FIG. It is sectional drawing which expands and shows the food freshness holder by 3rd Embodiment. It is sectional drawing which expands and shows the food freshness holder by 4th Embodiment.

  Hereinafter, a food freshness holder according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings, taking as an example a case where the food freshness holder is used for food preservation.

  Here, FIG. 1 to FIG. 6 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a food freshness holder used in the present embodiment. The food freshness holder 1 includes an adsorbent 2 described later and a packaging cover described later that covers the adsorbent 2 so as to be sealed from the outside. 3 is roughly constituted.

  2 is an adsorbent as a freshness-preserving agent adsorbed in a state in which the freshness-retaining liquid is impregnated, and the adsorbent 2 is made of, for example, a specially treated highly adsorbent virgin pulp material as shown in FIGS. It is formed in a rectangular flat plate shape, and its length is, for example, about 20 to 80 mm, the width dimension is about 15 to 60 mm, and the thickness dimension is about 1 to 6 mm.

  The adsorbent 2 is impregnated with a volatile freshness-maintaining liquid mainly composed of, for example, ethyl alcohol. In this case, as the freshness-retaining liquid, for example, an alcohol aqueous solution in which ethyl alcohol is 50 to 99 vol%, preferably 55 to 95 vol% is used. Such a freshness-retaining liquid volatilizes gradually from the outer surface of the adsorbent 2 and evaporates (volatilizes) to the outside through the film body 5 described later. Thereby, for example, the inside of a food package (not shown) such as confectionery is filled with the vapor (gas) of the gasified freshness-keeping liquid, and a freshness-keeping effect is obtained.

  Reference numeral 3 denotes a packaging cover that covers the adsorbent body 2 from the outside. The packaging cover 3 is configured such that, for example, a laminated film 4 (described later) is arranged so as to be stacked two on the top and bottom, and the peripheral edge 4A is sealed over four sides. It is formed by stopping. That is, as shown in FIG. 4, these laminated films 4 are continuously sealed on the four sides by a sealing portion 7 described later in a state where the adsorbent 2 is sandwiched from both the upper and lower sides.

  Here, the laminated film 4 is formed by laminating a printing layer 6 on a film body 5 described later. The laminated film 4 is prepared, for example, as a pair of upper and lower sheets as shown in FIG. 4, and sandwiches the adsorbent body 2 from both the upper and lower sides, and seals the four sides with a seal described later. By forming the portion 7, the adsorbent 2 is wrapped as a packaging cover 3 in a state of being completely sealed from the outside.

  Further, the laminated film 4 in this case is formed as a thin sheet (see FIG. 4) having a rectangular shape with a size larger than that of the adsorbing body 2, and laterally from the adsorbing body 2 (for example, front, rear and left, The peripheral edge 4A side projecting in the right direction) is sealed (heat sealed) in the upward and downward directions by a sealing portion 7 described later. And the upper and lower laminated films 4 cover the adsorbent body 2 from the outside at the portion located inside the portion corresponding to each sealing portion 7, thereby constituting the packaging cover 3 of the adsorbent body 2. is there.

  Reference numeral 5 denotes a transparent or translucent film body constituting the main part of the laminated film 4. The film body 5 is a single layer (one layer) film made of a resin material having both alcohol permeability and heat sealability. It is used to allow the freshness-retaining liquid to permeate the film body 5 in a vaporized state and prevent permeation in the liquid state. The film body 5 is formed from a single layer film with a thickness of about 10 to 70 μm, for example, and the gas permeability of the freshness-retaining liquid is increased or decreased almost in inverse proportion to the thickness of the film body 5. That is, the gas permeability of the freshness-retaining liquid increases when the thickness of the film body 5 is reduced, and the permeability decreases when the thickness is increased.

  Here, as the resin material (resin material having both alcohol permeability and heat sealability) used for the film body 5, for example, a soft polyester resin material which is a soft biodegradable resin material is used. That is, as the resin material used for the film body 5, for example, polybutylene succinate, polybutylene saadipate, polyethylene succinate, polycaprolactone, polylactic acid or other aliphatic polyester, or a co-polymer using some of these materials. Examples thereof include a polymer and a soft film obtained from a blend mainly composed of a plurality of these. Moreover, as a resin material used for the film body 5, a soft film obtained from an aliphatic aromatic polyester such as polybutylene adipate terephthalate or polytetramethylene terephthalate may be used.

  The film body 5 uses a film material having both alcohol permeability and heat sealability as described above, thereby allowing the freshness-retaining liquid to permeate in a vaporized state and prevent permeation in a liquid state. have. Thereby, the laminated film 4 (film body 5) has the property of blocking the permeation of liquid, although having permeability to gas.

  Reference numeral 6 denotes a printing layer formed on the inner surface of the film body 5, and the printing layer 6 is formed by printing on the inner surface of the film body 5 using, for example, alcohol-resistant ink. On the inner surface of the film body 5, for example, a product name, a manufacturer name, an effect note, a cautionary note, and the like are printed by the printing layer 6 as necessary. Moreover, the thickness of the printing layer 6 is formed in about 2-7 micrometers. The laminated film 4 is formed by laminating the film body 5 so that the printing layer 6 is superimposed.

  7 is a sealing portion formed on the peripheral edge 4A side of each laminated film 4, and these sealing portions 7 are two sheets sandwiching the adsorbent body 2 from the upper and lower sides as shown in FIGS. The laminated film 4 is sealed by four sides located on the outer edge side. As a result, the upper and lower two laminated films 4 are hermetically sealed with the four sides positioned at the peripheral edge 4A serving as the sealing portion 7, and constitutes a packaging cover 3 that encloses and accommodates the adsorbent 2 therein. To do.

  In this case, the film body 5 constituting the main part of the laminated film 4 is formed of a film material (for example, a material having a melting point of about 80 to 120 ° C.) having both alcohol permeability and heat sealability as described above. Has been. For this reason, by applying a heat sealing means to the peripheral edge 4A side of the laminated film 4, the corresponding part (outer edge part side) of the film body 5 is melted, and the upper and lower laminated films 4 are melted together. Thus, thermocompression bonding (heat sealing) is performed. And the sealing part 7 which consists of a total of 4 sides seals so that the outer edge part side of each film body 5 may be sealed, for example, the freshness retention liquid in the adsorption body 2 leaks outside from the position of the sealing part 7. , To prevent volatilization.

  The food freshness holder 1 according to the first embodiment has the above-described configuration. Next, the freshness holding operation will be described.

  First, when the food freshness holder 1 is manufactured, for example, as shown in FIG. 2, a series of arrayed state in which a large number of food freshness holders 1 in a pouch shape are arranged in the vertical direction and the horizontal direction. It is manufactured in a so-called continuous packaging state. A large number of food freshness holders 1 arranged in a series of rows as described above are used as food freshness holders 1 in the form of rectangular sachets as shown in FIGS. It is cut individually.

  Next, the food freshness holder 1 made of one sachet thus manufactured is used by inserting one or a plurality of the food freshness holders 1 into a food package such as confectionery. In this state, the freshness-retaining liquid impregnated in the adsorbent 2 of the food freshness-holding tool 1 gradually evaporates and evaporates in the packaging cover 3, and the volatile component (gas) of the gasified freshness-retaining liquid is laminated. It passes through the film 4 and is volatilized outside.

  In this case, when the volatilization component of the freshness-keeping liquid gasified in the packaging cover 3 permeates through the laminated film 4 (film body 5) in a gaseous state, if the volatilization speed of the freshness-holding liquid is excessively high, for example, food Alcohol is volatilized during the sealing process in the package (not shown), making it difficult to ensure the original freshness retention performance. On the other hand, when the volatilization rate of the freshness-keeping liquid is excessively slow, it takes time to achieve the freshness-keeping effect of the food in the food package, and the reliability as a food freshness-holding tool is lowered.

Therefore, the inventors select a plurality of types of film materials having both alcohol permeability and heat sealability as the film body 5 that is a material of the laminated film 4 constituting the packaging cover 3, and on each film, for each material, 24 hours in 1 m ² per (1 day) over alcohol permeability and ^{(g / m 2 · 24hr)} , the relationship between the alcohol concentration (vol%), respectively examined by experiment separately . Note that such an experiment was conducted under a temperature condition of 25 ° C., for example.

  In this case, the characteristic line 8 shown by a solid line in FIG. 6 shows the characteristic when the film body 5 is formed using a soft film made of an unstretched polyester copolymer called “Pal Seal GE” manufactured by Tosero Co., Ltd., for example. Show. In addition, the thickness of the film body 5 by this unstretched polyester copolymer is a case where it is 30 micrometers, for example.

And in the case of the film body 5 by an unstretched polyester copolymer, the alcohol density | concentration of freshness retention liquid is changed in order, for example in the range of 50 to 99%, and the permeability (g / m < ² > * 24hr) in the vaporization state is changed. ), When the alcohol concentration is 99%, it is 440 g, when it is 95%, it is 530 g, when it is 65%, it exceeds 600 g, and when it is 50%, the gas permeability is up to about 640 g. Was confirmed to be high.

For example, when the film body 5 is formed using a soft film made of polybutylene succinate adipate called “Eco-Rom film” manufactured by Okura Kogyo Co., Ltd., along the characteristic line 9 shown in FIG. The transmission characteristics were confirmed. In this case, the thickness of the film body 5 is set to 30 μm, and the alcohol concentration of the freshness-keeping liquid is sequentially changed within a range of 50 to 99%, for example, and the permeability (g / m ² · 24 hr) in the vaporized state is examined. saw.

  In the case of a soft film made of polybutylene succinate adipate, as indicated by a characteristic line 9 in FIG. 6, when the alcohol concentration is 99%, for example, the permeability is 730 g before and after, and the alcohol concentration Is 95%, the transmittance increases up to about 860 g, for example. Then, as shown in the characteristic line 9, when the alcohol concentration is gradually lowered to about 65%, for example, a permeability of about 955 g is obtained, and for example, about 50%, a gas permeability of about 1000 g can be obtained.

On the other hand, in the case of the characteristic line 10 shown in FIG. 6, a soft film made of an unstretched polyester copolymer called “PALSEAL GE-S” manufactured by Tosero Co., Ltd., which is substantially the same as the characteristic line 8 described above. This is a case where the film body 5 is formed by using the film body 5 and the thickness of the film body 5 is, for example, 50 μm. The gas permeability (g / m ² · 24 hr) in this case is about 250 g when the alcohol concentration is 99%, about 320 g when the alcohol concentration is 95%, and 390 g when 65%. It was confirmed that when it exceeds 50%, it exceeds 400 g.

Moreover, in the case of the characteristic line 11 shown in FIG. 6, the same material as the characteristic line 9 described above, for example, a soft film made of polybutylene succinate adipate called “Ecolome film” manufactured by Okura Kogyo Co., Ltd. It is a case where the film body 5 is formed using the thickness of 18 μm. The gas permeability (g / m ² · 24 hr) in this case is, for example, before and after 1210 g when the alcohol concentration is 99%, as shown by the characteristic line 11, and when the alcohol concentration is 95%, for example, It was confirmed that the permeability increased to about 1430 g, for example, about 1595 g when about 65%, and about 1650 g of gas was obtained when about 50%, for example.

Moreover, in the case of the characteristic line 12 shown in FIG. 6, the film body 5 is formed using the soft film which consists of polybutylene salacinate called "GS Pla" made from Mitsubishi Chemical Corporation, for example, and the thickness is 20 micrometers. This is the case. The gas permeability (g / m ² · 24 hr) in this case is, for example, 170 g before and after when the alcohol concentration is 99% as shown by the characteristic line 12, and 260 g when the alcohol concentration is 95%. For example, when it is about 65%, it is about 410 g, and when it is about 50%, it has been confirmed that a gas permeability of about 450 g can be obtained.

  Therefore, the inventors pay attention to the characteristics of the film material having both the alcohol permeability and heat sealability used for the film body 5 (that is, the relationship between the material, the thickness and the alcohol concentration of the freshness-retaining liquid), For example, with reference to the transmission characteristics indicated by characteristic lines 8 to 12 in FIG. 6, it was considered to form the film body 5 that satisfies the desired use of keeping freshness.

  That is, by appropriately selecting the material of the film body 5 having both alcohol permeability and heat sealability, the thickness of the film body 5, and the alcohol concentration of the freshness-retaining liquid impregnated in the adsorbent body 2, for example, in a food packaging body The freshness retention period for foods (not shown) can be adjusted appropriately according to each application, and the volatilization rate of the freshness-retaining liquid can be prevented from becoming too fast or too slow. We have obtained knowledge that we can do it.

  Thus, according to the present embodiment, when the food freshness holder 1 consisting of one sachet is taken as an example, the packaging cover 3 that covers the adsorbent 2 from the outside includes the upper and lower laminated films 4. They are formed by overlapping each other and sealing the peripheral edge 4A of the two laminated films 4 over four sides in this state. In an actual manufacturing process, a large number of freshness holders 1 are manufactured side by side in a continuous packaging state together with the packaging cover 3, and cut into a food freshness holder 1 consisting of one sachet at the final stage.

  The laminated film 4 is formed by using a film made of a resin material having both alcohol permeability and heat sealability, and allows the freshness-retaining liquid to permeate in a vaporized state and prevent permeation in a liquid state. A transparent or translucent film body 5 and a printing layer 6 formed by printing on the inner surface of the film body 5 are configured.

  For this reason, the gas volatilized from the freshness retaining liquid previously impregnated in the adsorbent 2 permeates the film body 5 (film having alcohol permeability and heat sealability) of the packaging cover 3 (laminated film 4) to the outside. Can be volatilized. Thereby, like the prior art, a freshness-keeping liquid can be volatilized outside without specially providing a volatilization opening or the like, and a freshness-keeping effect on foods and the like can be exhibited.

  Further, even if a forced external force or the like is applied to the adsorbent 2 from the outside of the packaging cover 3, the freshness-retaining liquid impregnated in the adsorbent 2 does not pass through the film body 5 in a liquid state. The freshness-keeping liquid can be stored inside the packaging cover 3 in an enclosed state, and the freshness-keeping liquid can be prevented from exuding to the outside in the liquid state by the packaging cover 3 made of the film body 5.

  In addition, the film body 5 is formed by appropriately selecting the material and thickness of the film material having both alcohol permeability and heat sealability, and appropriately selecting and adjusting the alcohol concentration of the freshness-retaining liquid, and printing. The ratio between the printing area and the non-printing area by the layer 6 (alcohol resistant ink) is also appropriately selected and adjusted. Thereby, the speed at which the gas of the freshness retaining liquid permeates and volatilizes from the adsorbent 2 to the outside of the packaging cover 3 can be optimized. For example, the freshness retaining tool for food (not shown) in the food packaging body The freshness maintaining effect by 1 can be adjusted appropriately.

That is, the gas permeability of the packaging cover 3 is 170 to 1,650 g / m ² · 24 hr when the alcohol concentration of the freshness retaining liquid is in the range of 50 to 99 vol%, preferably in the range of 65 to 95 vol%. , And preferably adjusted to be 260 to 1,600 g / m ² · 24 hr.

  Therefore, according to the food freshness retainer 1 according to the present embodiment, the freshness retaining liquid impregnated in the adsorbent 2 can be prevented from oozing out of the packaging cover 3, and the life as the food freshness retainer 1 can be prevented. , Can increase the reliability. And as a soft polyester resin film (soft biodegradable resin film) used for the film body 5, selection of each material, thickness, etc. like the permeation | transmission characteristic shown by the characteristic lines 8-12 in FIG. 6, for example. Or adjust the alcohol concentration.

  Thereby, the volatilization speed when the freshness-retaining liquid volatilizes from the adsorbent 2 to the outside of the packaging cover 3 (film body 5) can be appropriately adjusted according to the food to be stored. As a result, the commercial value of the food freshness holder 1 can be further increased, and the freshness of food and the like can be stably maintained over a long period of time.

  Moreover, since the packaging cover 3 of the food freshness holder 1 employed in the present embodiment has a structure in which the adsorbent 2 is completely wrapped from the outside and sealed by the four-side sealing portions 9, for example, food The adsorbent 2 does not come into direct contact with the food (not shown) in the package, and the problem that the freshness-retaining liquid in the adsorbent 2 is absorbed by the food can be eliminated. Can extend the lifespan.

  On the other hand, for example, the printing layer 6 that prints a product name, a notice, etc. as necessary is formed by printing on the inner surface of the film body 5 using, for example, an alcohol-resistant ink that ensures food hygiene. The For this reason, food safety in maintaining the freshness of food and the like can be ensured, and problems such as the ink used for the printing layer 6 oozing out of the packaging cover 3 can be eliminated.

  Moreover, since the film body 5 is formed of a film material having both alcohol permeability and heat sealability, by applying a heat seal means to the peripheral edge 4A side of the laminated film 4, the corresponding part of the film body 5 can be obtained. (Outer edge side) is melted, and the upper and lower laminated films 4 are melted together, so that thermocompression bonding (heat sealing) can be easily performed.

  Thus, at the position near the peripheral portion 4A of the film body 5 (laminated film 4), the sealing portions 7 are easily formed on the four sides of the packaging cover 3 due to the heat sealability of the film body 5 itself. The adsorbent 2 can be enclosed in the inside. Moreover, the film body 5 has alcohol permeability in addition to heat sealability, thereby allowing the gas of the freshness retaining liquid to permeate the outside of the packaging cover 3 made of the film body 5 and exhibiting a freshness retaining effect on food. be able to.

  Next, FIGS. 7 to 10 show a second embodiment of the present invention. The feature of the present embodiment is that a translucent nonwoven fabric layer is added to the outer surface of the film body constituting the packaging cover. It is in the structure to provide. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, 21 is a food freshness holder used in the present embodiment. The food freshness holder 21 is similar to the food freshness holder 1 described in the first embodiment, and the adsorbent 2 and the film. It is comprised by the packaging cover 22 which consists of the body 5 grade | etc.,. However, the food freshness holder 21 in this case is different from the first embodiment in that a nonwoven fabric layer 26 is added to the outer surface of a laminated film 23 described later.

  A packaging cover 22 covers the adsorbent body 2 from the outside. The packaging cover 22 is also configured in the same manner as the packaging cover 3 described in the first embodiment, and has four sides with the adsorbent body 2 inserted therein. It is continuously sealed by the sealing part 7. However, the packaging cover 22 in this case is different from the first embodiment in that a non-woven fabric layer 26 to be described later is added to the laminated film 23 that is the material.

  Here, the laminated film 23 is formed by laminating the printing layer 6 on the inner side surface of the film body 5 and laminating the nonwoven fabric layer 26 on the outer side surface of the film body 5 via an adhesive layer 24 described later. Is done. The laminated film 23 is formed as a thin sheet having a rectangular shape with a size larger than that of the adsorbing body 2 in the same manner as the laminated film 4 (see FIG. 4) described in the first embodiment. The peripheral portion 23A side projecting in the direction (for example, front, rear direction and left, right direction) is sealed (heat sealed) by the sealing portion 7 in the upward and downward directions. At this time, the peripheral part of the nonwoven fabric layer 26 to be described later is also thermocompression bonded to the film body 5.

  Reference numeral 24 denotes an adhesive layer formed on the outer surface of the film body 5, and the adhesive layer 24 is formed of, for example, an adhesive having oil resistance and alcohol resistance that ensures food hygiene, and is a nonwoven fabric layer described later. 26 is used for laminating the outer surface of the film body 5. And the adhesive layer 24 is comprised by many strip | belt-shaped adhesive bond layers 24A, 24B etc. which were formed in the outer surface of the film body 5 by making a lattice pattern as shown, for example in FIG. It is formed to about 10 μm.

  Here, the lattice-shaped or diamond-shaped space 25 (see FIG. 9) partitioned between the respective strip-like adhesive layers 24A and 24B appropriately secures a transmission space when the freshness-retaining liquid gas passes through the film body 5. I can do it. As a result, even when the strip adhesive layers 24A and 24B of the adhesive layer 24 have a high impermeability to gas (freshness-retaining liquid that has been vaporized and gasified), the strip adhesive layers 24A and 24B. The freshness-retaining liquid gas can permeate to the outside of the film body 5 through the rhombus-shaped space 25 as a transmission space formed therebetween.

  And when the transmittance | permeability of the film body 5 is large, what is necessary is just to take large the application area of the impermeable adhesive bond layer which consists of each strip | belt-shaped adhesive bond layers 24A and 24B, and to limit a permeation | transmission space. Thereby, the gas of an appropriate freshness retention liquid can be permeate | transmitted to the outer side of the film body 5. FIG. Moreover, the below-mentioned nonwoven fabric layer 26 is laminated | stacked on the outer surface of the film body 5 by each strip | belt-shaped adhesive bond layers 24A and 24B of the contact bonding layer 24. FIG.

  Reference numeral 26 denotes a translucent nonwoven fabric layer constituting the laminated film 23 together with the film body 5 and the like. The nonwoven fabric layer 26 has the same size as that of the film body 5, and the adhesive layer 24 is provided on the outer surface of the film body 5. Are integrated (laminated) so as to be bonded together. And the film-form raw material which comprises the nonwoven fabric layer 26 is, for example, polyethylene terephthalate (PET), polypropylene (PP), polyethylene (PE), polylactic acid, polybutylene succinate, or two or more of these materials It is formed by using a gas permeable material formed by entwining fine fibers made of selectively combined synthetic resin materials into a cloth shape or a thin sheet shape.

  Here, the non-woven fabric layer 26 has a property that allows gas to permeate inside and outside, and also allows a certain degree of liquid permeation. And the nonwoven fabric layer 26 can reinforce the film body 5 from the outside by covering the entire outer surface of the film body 5. Moreover, the glossiness in the outer surface of the film body 5 can be suppressed from the outside by the semi-transparent nonwoven fabric layer 26, and the appearance of the packaging cover 22 (food freshness holder 21) and the commercial value are enhanced.

  Thus, also in the present embodiment configured as described above, the laminated film 23 serving as the material of the packaging cover 22 is formed of a film body 5 made of a film material having both alcohol permeability and heat sealability, and the film body 5. The printed layer 6 is formed by laminating on the inner side surface of the film body, and the nonwoven fabric layer 26 is laminated on the outer side surface of the film body 5 via the adhesive layer 24. As a result, the freshness-retaining liquid can be gradually evaporated from the adsorbent 2 to the outside of the packaging cover 22, and substantially the same effect as that of the first embodiment can be obtained.

  Here, the laminated film 23 employed in the second embodiment is, for example, a discharge nozzle means having a comb-like shape on the outer surface of the film body 5 having the printed layer 6 formed on the inner surface as shown in FIG. (Not shown) etc. are used to form the adhesive layer 24. And the nonwoven fabric layer 26 was covered from the upper side of the contact bonding layer 24, and the nonwoven fabric layer 26 was laminated | stacked on the outer surface of the film body 5 in this state, and the film body 5, the contact bonding layer 24, and the nonwoven fabric layer 26 were integrated. A laminated film 23 is formed.

  Next, the laminated film 23 manufactured in this way is prepared, for example, as a pair of upper and lower sheets, and sandwiches the adsorbent body 2 from both the upper and lower sides, and seals the four sides thereof with sealing portions. 7, the adsorbent 2 is wrapped as a packaging cover 22 in a state of being completely sealed from the outside.

  Moreover, even when manufacturing the food freshness holder 21 according to the second embodiment, as in the food freshness holder 1 (see FIG. 2) having a pouch shape described in the first embodiment, Manufactured in a series of rows (continuous packaging) arranged in a row in the horizontal direction. And many food freshness holders 21 which became the state of continuous packaging in this way are cut individually as the food freshness holder 21 (refer FIG. 1) which makes a rectangular pouch shape by the cutting process of a production line, etc. Is.

  However, in the second embodiment, the nonwoven fabric layer 26 is laminated on the outer surface of the film body 5 via the adhesive layer 24, thereby forming the laminated film 23 (packaging cover 22). For this reason, while being able to reinforce the film body 5 with the nonwoven fabric layer 26, the glossiness in the outer surface of the film body 5 can be suppressed from the outside by the translucent nonwoven fabric layer 26, and the packaging cover 22 (food freshness holder 21) As a product, the product value can be increased.

  In particular, if the outer surface of the film body 5 is glossy, it is easy to give the user a misunderstanding as to whether the surface is wet. As a result, it seems as if the internal freshness retaining liquid has oozed out of the packaging cover 22. It gives an impression. However, in the food freshness holder 21 according to the present embodiment, the glossiness can be eliminated by the non-woven fabric layer 26 by covering the outer surface of the film body 5 with the translucent non-woven fabric layer 26, and the user misunderstands. Can be eliminated.

  Moreover, in the second embodiment, the material and thickness of the film material having both alcohol permeability and heat sealability used for the film body 5, the alcohol concentration of the freshness-retaining liquid, the printing area and the non-printing area by the printing layer 5 By appropriately selecting and adjusting the ratio and the width of the rhombus-shaped space 25 by the band-like adhesive layers 24A and 24B, the freshness-retaining liquid gas is transmitted and volatilized from the adsorbent 2 to the outside of the packaging cover 22. For example, the freshness retention effect of the freshness retainer 21 on the food (not shown) in the food package can be adjusted appropriately.

  In addition, in 2nd Embodiment mentioned above, the laminated | multilayer film 23 formed by laminating | stacking the nonwoven fabric layer 26 on the outer surface of the film body 5 through the contact bonding layer 24 was mentioned as an example, and was demonstrated. However, the present invention is not limited to this, and the nonwoven fabric layer 26 may be directly superimposed on the outer surface of the film body 5 without an adhesive layer.

  In this case, the film body 5 is formed of a film material having both alcohol permeability and heat sealability. For this reason, the nonwoven fabric layer 26 can be directly laminated on the outer surface of the film body 5 by utilizing the heat sealability of the film body 5. That is, the non-woven fabric is used when the peripheral portion 23A side protruding from the adsorbent body 2 to the side (for example, front, rear direction and left, right direction) is sealed (heat sealed) upward and downward by the sealing portion 7. The peripheral edge of the layer 26 can also be thermocompression bonded to the film body 5.

  Next, FIG. 11 shows a third embodiment of the present invention. The feature of this embodiment is that a freshness-retaining liquid is provided in a packaging state in a liquid state. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, 31 is a food freshness holder used in the present embodiment, and the food freshness holder 31 does not use the adsorbent 2 as in the food freshness holder 1 described in the first embodiment. A freshness-keeping liquid 32 as a freshness-keeping agent is directly enclosed in a packaging cover 33 described later.

  In this case, as described in the first embodiment, for example, an aqueous alcohol solution in which ethyl alcohol is 50 to 99 vol%, preferably 55 to 90 vol%, is used for the freshness retaining liquid 32. Such freshness-keeping liquid 32 is gradually volatilized in the packaging cover 33, becomes a gaseous state, and is evaporated to the outside through the film body 5.

  Reference numeral 33 denotes a packaging cover employed in the present embodiment, and the packaging cover 33 is configured using the laminated film 4 in the same manner as the packaging cover 3 described in the first embodiment. The laminated film 4 is formed by laminating the print layer 6 (see FIG. 5) on the inner surface of the film body 5 as described in the first embodiment.

  Reference numeral 34 denotes a sealing portion formed on the peripheral edge 4A side of each laminated film 4, and these sealing portions 34 are positioned on the outer edge side of, for example, two laminated films 4 stacked one above the other. It is formed by sealing on four sides. As a result, the upper and lower laminated films 4 are sealed with the four sides positioned at the peripheral edge 4A serving as the sealing portion 34, and the packaging cover 33 containing the freshness-retaining liquid 32 enclosed therein is accommodated. It constitutes.

  Thus, in the present embodiment configured as described above, the volatile freshness-keeping liquid 32 is sealed in a liquid state in the packaging cover 33 formed using the laminated film 4 including the film body 5 and the printing layer 6. It is configured. For this reason, for example, the adsorbent 2 used in the first embodiment can be eliminated, the number of parts can be reduced, and the manufacturing process can be simplified.

  In the third embodiment, packaging is performed by forming the laminated film 4 and the packaging cover 33 using the film body 5 made of a soft biodegradable resin film having both alcohol permeability and heat sealability. The freshness-keeping liquid 32 in the cover 33 can be prevented from exuding to the outside in the liquid state, the freshness of foods and the like can be stably kept for a long time, and the food freshness-holding tool 31 Product value can be increased.

  And the sealing part 34 which consists of a total of 4 sides provided in the outer edge part of the packaging cover 33 seals so that the outer edge part side of each film body 5 may be sealed, and the freshness maintenance accommodated as a liquid in the packaging cover 33 It is possible to prevent the liquid 32 from leaking from the position of the sealing portion 34 to the outside or evaporating (volatilizing).

  Next, FIG. 12 shows a fourth embodiment of the present invention, which is characterized in that a freshness-retaining liquid is enclosed in a packaging cover having a nonwoven fabric layer. In the present embodiment, the same components as those in the second embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the figure, 41 is a food freshness holder used in the present embodiment, and the food freshness holder 41 does not use the adsorbent 2 like the food freshness holder 21 described in the second embodiment. The freshness retaining liquid 32 is directly enclosed in a packaging cover 42 described later. The freshness-retaining liquid 32 in this case is the same as that described in the third embodiment.

  42 shows the packaging cover employ | adopted by this Embodiment, This packaging cover 42 is comprised using the laminated | multilayer film 23 similarly to the packaging cover 22 described in 2nd Embodiment. As described in the second embodiment, the laminated film 23 is formed by laminating the printing layer 6 (see FIG. 10) on the inner surface of the film body 5, and the adhesive layer 24 on the outer surface of the film body 5. It is formed by laminating the nonwoven fabric layer 26 via

  43 is a sealing portion formed on the side of the peripheral edge 23A of each laminated film 23. These sealing portions 43 are positioned on the outer edge side of, for example, two laminated films 23 that are superimposed on the top and bottom. It is formed by sealing on four sides. As a result, the upper and lower two laminated films 23 are hermetically sealed with the four sides positioned at the peripheral edge 23A serving as the sealing portions 43, and the packaging cover 42 that encloses and stores the freshness-retaining liquid 32 therein. It constitutes.

  Thus, in this embodiment configured as described above, a volatile freshness-retaining liquid is formed in the packaging cover 42 formed by using the laminated film 23 composed of the film body 5, the printing layer 6, the adhesive layer 24, and the nonwoven fabric layer 26. 32 is sealed in a liquid state. For this reason, for example, the adsorbent 2 used in the first and second embodiments can be made unnecessary, and the number of parts can be reduced to simplify the manufacturing process.

  Moreover, since the packaging cover 42 enclosing the freshness-retaining liquid 32 is laminated with the nonwoven fabric layer 26 on the outer surface of the film body 5 with the adhesive layer 24 interposed therebetween, the glossiness of the outer surface is translucent. 26, the appearance of the packaging cover 42 (food freshness holder 41) and the commercial value can be increased.

  In the above-described fourth embodiment, the laminated film 23 used for the packaging cover 42 is exemplified by a case where the adhesive layer 24 and the nonwoven fabric layer 26 are laminated on the outer surface of the film body 5 as an example. explained. However, the present invention is not limited to this, and the nonwoven fabric layer 26 may be directly superimposed on the outer surface of the film body 5 without an adhesive layer. In this case, since the film body 5 is formed of a film material having both alcohol permeability and heat sealability, the nonwoven fabric layer 26 is removed from the film body 5 by utilizing the heat sealability of the film body 5. It can be directly laminated on the side surface.

  In the second embodiment, the case where the adhesive layer 24 is constituted by a large number of strip-shaped adhesive layers 24A and 24B and a large number of rhombus-shaped spaces 25 are formed between them is described as an example. However, the present invention is not limited to this, and may be configured to form a large number of transmission spaces that form, for example, a lattice pattern, a zigzag pattern, or a polka dot pattern. The permeation space in this case may be formed in various shapes such as a circle, an ellipse, a triangle, and a polygon as long as it can pass through the gas of the freshness-retaining liquid. This is the same for the fourth embodiment.

  In the first embodiment, as illustrated in FIG. 4, the case where the adsorbent 2 is sandwiched between the upper and lower sides by the two laminated films 4 has been described as an example. . However, the present invention is not limited to this. For example, the packaging cover may be formed by wrapping the adsorbent from the outside using a single laminated film. Similar changes can be made to the second to fourth embodiments.

  Moreover, in the said 1st Embodiment, the case where the film body 5 was formed with the film of the single layer which has one alcohol permeability and heat-sealing property was mentioned as an example, and was demonstrated. However, the present invention is not limited to this. For example, the film body may be formed of a laminate film formed by laminating two or three films. The film body in this case may be formed by, for example, laminating (laminating) the same kind of alcohol-permeable and heat-sealable films, and a different kind of film material is selected to form a laminated film. May be. This also applies to the second to fourth embodiments.

  Moreover, in the said 1st Embodiment, the case where the adsorption body 2 and the packaging cover 3 (laminated film 4) were formed in rectangular shape was mentioned as an example, and was demonstrated. However, the present invention is not limited to this, and for example, the adsorbent may be formed of a flat plate or cylinder having a polygonal shape other than powder, granular, rectangular, etc., and the packaging cover also has the shape of the adsorbent. Changes can be made accordingly. This point is the same as in the second embodiment.

  Furthermore, in the said 1st Embodiment, the case where the adsorbent 2 was comprised using high adsorptive virgin pulp material etc. was mentioned as an example, and was demonstrated. However, the present invention is not limited to this, and the adsorbent may be configured using, for example, paper made of cardboard, filter paper, or the like, or a porous absorbent made of sponge, silica gel, zeolite, or the like. This point is the same as in the second embodiment.

1,21,31,41 Food freshness retainer 2 Adsorbent (freshness retainer)
3, 22, 33, 42 Packaging cover 4, 23 Laminated film 5 Film body 6 Print layer 7, 34, 43 Sealing portion 24 Adhesive layer 26 Non-woven fabric layer 32 Freshness retaining liquid (freshness retaining agent)

Claims (3)

A freshness-preserving agent that retains the freshness of food or other preserved items, and a packaging cover that covers the freshness-preserving agent from the outside, the freshness-retaining agent comprising a volatile freshness-retaining liquid mainly composed of alcohol; In addition, in the food freshness holding tool constituted by either one of the adsorbent adsorbed in the impregnated state,
The packaging cover is
A transparent or translucent film that is formed using a film made of a resin material that has both alcohol permeability and heat sealability, and that allows the freshness-retaining liquid to permeate in a vaporized state and prevents permeation in a liquid state Body,
A printing layer formed by printing on the inner surface of the film body,
The gas permeability of the packaging cover that evaporates the freshness-retaining liquid is 170-1650 (g / m ² · 24 hr) when the alcohol concentration of the freshness-retaining liquid is in the range of 50-99 vol%. The food freshness retainer characterized by having a configuration adjusted to (1).   The food freshness retainer according to claim 1, wherein the packaging cover is configured to be provided with a translucent nonwoven fabric layer on an outer surface of the film body.   The food freshness retainer according to claim 1 or 2, wherein the film body is formed using a soft polyester resin material.

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