JP2597623Y2 - Packaging bag - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a barrier property and absorbs water vapor and the like generated from a product by a mechanism inside the packaging bag, thereby keeping the product with high quality for a long time and improving the volume. A packaging bag having the same.

[0002]

2. Description of the Related Art A plastic film packaging bag (that is, a packaging bag using a plastic film) is provided with various functions so as to be suitable for the product to be packaged or the circumstances of distribution of the product.

[0003] The various functions provided generally include quality retention such as barrier properties, workability such as machinability and adhesion, convenience in the distribution process or use and consumption process, and the like.
Or, there are merchantability such as exhibitability or signability.

[0004] In the following, a packaging bag is used as a plastic film packaging bag unless otherwise specified.

[0005] The addition of these various functions to the packaging bag is as follows.
It is common to select the type of plastic film or to laminate plastic films, and there are many proposals for these.

[0006] The lamination of plastic films is an effective means for imparting a plurality of functions to a packaging bag or increasing a specific function of the packaging bag. However, a packaging bag using a laminated plastic film (hereinafter, sometimes abbreviated as a laminated film) has a specific function improved by using the laminated film, but on the other hand, the problem is increased or a new problem is caused. Spots sometimes occurred.

[0007] A typical example is a packaging bag, which is industrially practiced and has a high barrier property added by using a laminated film.

[0008] In a packaging bag having such a high barrier property, even if moisture derived from a product (for example, moisture derived from fresh food) is generated inside the packaging bag, the packaging bag itself has a high barrier property. Therefore, there is a problem that the product accumulates in the bag and deteriorates the product in the packaging bag.

In order to prevent such a problem from increasing, a method is used in which a small bag is filled with a dehumidifying agent such as silica gel and the bag is previously placed in a packaging bag. Was only.

[0010] In addition, it is difficult to remove moisture (for example, moisture derived from fresh foods) from commodities using a dehumidifier such as silica gel, and cannot be used for commodities that are packaged and frozen or refrigerated. There was a problem.
In particular, when the packaged product is frozen or refrigerated, there is a problem that moisture derived from the product is generated due to various factors, and the product comes into contact with the moisture and the product is deteriorated. There was no plastic film packaging bag that solved the problem.

[0011] Further, using a plastic film mixed with an anti-fogging agent, moisture generated inside the packaging bag derived from the product is dropped into the packaging bag as water droplets from the plastic film surface of the packaging bag by the action of the anti-fogging agent. It is often practiced industrially to prevent the plastic film surface from fogging.

However, even when the plastic film mixed with the anti-fogging agent is used, the water droplets generated inside the packaging bag fall down from the plastic film and remain in the packaging bag and accumulate as in the case described above. However, there is a problem that the moisture in the packaging bag deteriorates the product.

That is, in the conventional plastic film packaging bag, there has been an idea that a barrier property and an anti-fogging property are imparted to the packaging bag, but a product generated inside the packaging bag due to the improvement of the barrier property and the anti-fogging property is provided. Since there was no idea of removing the moisture originating from itself by the mechanism inside the packaging bag, there was a problem that the deterioration of the product due to the moisture generated inside the packaging bag was neglected.

[0014] Further, the packaging container or bag, when put into them and put in a packaging form (a form in which the opening is sealed and placed in a distribution process or a consumption use process),
That the packaging form becomes a rounded three-dimensional shape,
It has been considered preferable in terms of commercial value such as exhibitability and technical value such as quality maintenance of products (especially foods).

[0015] The visual feeling received from a state in which the packaging form has a rounded three-dimensional shape is generally called that the packaging form has a sense of volume. The term "volume" is used to indicate the ability of the packaging bag itself to provide such a sense of volume.

However, the conventional plastic film packaging bag has no volume, and the lack of volume was considered to be unique to the plastic film packaging bag. For this purpose, nitrogen gas or the like is sealed in a plastic film packaging bag and inflated to give a sense of volume (for example, a packaging bag containing bonito shavings).

However, the addition of nitrogen gas or the like to give a sense of volume is caused by the contact of nitrogen gas or the like with the product.
There is a problem that it cannot be used for packaging of many foods.

[0018]

Heretofore, there have been many proposals for providing plastic film packaging bags with functions such as product quality such as quality retention, exhibitability and marking. However, there was no idea that the moisture generated inside the packaging bag was captured by the mechanism inside the packaging bag and the interior of the packaging bag was kept in a dry state. However, there is a problem that even if the product can be prevented from deteriorating due to the above, deterioration due to water vapor or the like generated from the product in the packaging bag cannot be prevented. Since conventional plastic film packaging bags do not have a volume property, trays made of expanded polystyrene etc. in a boat bottom type are used for packaging that requires a sense of volume while being one of the environmental pollution sources. There was a problem.

Further, the method of giving a sense of volume by enclosing nitrogen gas or the like cannot be adopted depending on the product in many cases, and there is a problem that handling becomes complicated.

In many cases, the products packaged in the plastic film packaging bag are food products (for example, fresh food products), but in many cases, there is a problem that encapsulation with nitrogen gas or the like is not suitable.

The present invention solves such a problem, and
It is an object of the present invention to provide a packaging bag having a new function that a conventional plastic film packaging bag did not have. That is, the present invention firstly blocks the intrusion of oxygen or water vapor into the packaging bag, and absorbs the moisture such as water vapor generated from the product by the mechanism in the packaging bag, whereby the moisture is removed. It is an object of the present invention to provide a packaging bag which can keep a product of high quality for a long time in the course of distribution or storage without contacting the product.

In particular, the present invention is directed to a packaging bag which can be refrigerated or frozen for a long time with high quality without losing the product even if moisture derived from the product is generated during refrigeration or freezing. The purpose is to provide.

Second, the present invention is characterized in that the plastic film packaging bag (that is, a soft packaging bag) has a volume property while being packaged, and does not require any special means for packaging (for example, nitrogen gas or the like). ), And to provide a packaging bag capable of giving a sense of volume.

The third object of the present invention is to provide a packaging bag having advantages such as easy introduction of a product into the packaging bag.

[0025]

The packaging bag according to the present invention comprises:
(A) Laminated plastic film or middle part constituting the front side
Across the plastic film layer becomes to barrier plastic film of the innermost layer of antifogging plastic film and the outermost layer are stacked, laminated flops constituting the backside
The plastic film replaces the intermediate plastic film
Sandwiched therebetween be one barrier plastic film of the innermost layer plastic nonwoven and the outermost layer are laminated, the laminated plastic film constituting the (b) back, resulting in the measurement method specified in No. ASTM-D882 The tensile elastic modulus (kg / mm ² ) is larger than that of the laminated plastic film constituting the front side.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be specifically described with reference to FIGS. Although the packaging bag shown in FIGS. 1 to 4 is a preferred embodiment of the present invention, it is merely an example of the present invention. FIG. 1 is a perspective view of a packaging bag, and 1 is a packaging bag. The packaging bag 1 is a three-side-sealed packaging bag in which two laminated films 2 and 3 are overlapped and heat-sealed on both sides 4, 5 and the bottom 6. Reference numeral 7 denotes an opening of the packaging bag 1, which is sealed by heat sealing after the product is put in the packaging bag 1.

FIG. 2 is a perspective view showing a part of the laminated film 2 constituting the packaging bag 1 in a cutaway manner. The laminated film 2 is transparent, and after the product is put in the packaging bag 1 and the opening 7 is heat-sealed, the front side of the packaging bag 1 (that is, the packaging bag 1).
Side that visually recognizes the product inside).

The outermost layer 20 is a vinylidene chloride-coated polyester film having a thickness of about 12 μm, the intermediate layer 21 is a polyethylene film having a thickness of about 20 μm (typically laminated by extrusion lamination), and the innermost layer 22 is about 3 μm.
It is composed of a polyethylene film (typically formed by a casting method or an insulation method) having a thickness of 5 μm and containing an antifogging agent.

In the laminated film 2, the outermost layer 20 is a polyester film coated with vinylidene chloride having an excellent barrier property to prevent oxygen and water vapor from entering the packaging bag 1.

The thickness of the intermediate layer 21 is about 25 μm.
The innermost layer 22 is laminated on a polyethylene film mixed with an anti-fogging agent having a thickness of about 35 μm to increase the rigidity of the entire laminated film 2 and increase the strength.

In the actual use of the packaging bag 1, the innermost layer 22 is a polyethylene film layer mixed with an anti-fogging agent, since the innermost layer 22 is a surface directly in contact with the surface of the product.

The synthetic resin used for the innermost layer 22 may be any resin that can be easily heat-sealed and has a high heat-sealing strength. For example, linear low-density polyethylene (LL-L) may be used.
DPE), an ethylene-based or copolymer-based synthetic resin such as an ethylene-vinyl acetate copolymer, and a propylene-based or copolymer-based synthetic resin such as polypropylene.

FIG. 3 is a perspective view showing a part of the laminated film 3 constituting the packaging bag 1 in a cutaway manner. The laminated film 3 constitutes the back side of the packaging bag 1 after the product is put in the packaging bag 1 and the opening 7 is heat-sealed, and the innermost layer serves to hold the product placed thereon. ing.

When filling the packaging bag 1 with the product by the filling machine, the product is introduced into the packaging bag 1 while contacting the innermost layer of the laminated film 3. In the laminated film 3, the outermost layer 30 is a vinylidene chloride-coated nylon film having a thickness of about 15 μm, the intermediate layer 31 is a polyethylene film having a thickness of about 20 μm, and the innermost layer 32 is a layer of polypropylene nonwoven fabric having a weight of about 20 g / m ^2. is there.

For this reason, in the laminated film 3, the nonwoven fabric layer contacts and holds the back surface of the product. For this reason, the moisture on or near the surface of the product is completely absorbed and held by the nonwoven fabric, and the product is held in a positionally stable state because the product is on the nonwoven fabric. items on the occasion to the filling of the product is easily filled because moves over the layer of non-woven fabric.

A film layer having excellent barrier properties is laminated on the outermost layer 30, and a vinylidene chloride-coated nylon film is used to increase the barrier properties. The term “barrier property” may be used in a broad or narrow sense, but in the present specification, is used to mean a performance capable of preventing or blocking the permeation of water vapor and / or various gases. .

In the laminated film 3, a nonwoven fabric made of polypropylene (the innermost layer 30) is laminated on a polyethylene film layer (an intermediate layer 31, the polyethylene film is excellent in heat sealability). The innermost layer 22 (polyethylene film layer containing an anti-fogging agent) of the laminated film 2 of the base material,
And heat sealed on three sides of the bottom portion 6 to form a packaging bag (ie, a three-side sealed packaging bag).

Furthermore, the packaging bag 1 has a total thickness of the laminated film 2 larger than that of the laminated film 3, but forms a back side of the packaging bag 1 by laminating a rigid film layer on the laminated film 3. The rigidity of the laminated film 3 is set to be larger than the rigidity of the laminated film 2 constituting the front side of the packaging bag 1. When the product is put into the packaging bag 1 and the opening 7 is heat-sealed, the layer (laminated film 3) on the back side of the packaging bag 1 is composed of the laminated film 3 having high rigidity, and the non-woven fabric is Is provided. Non-woven fabric that directly aggregates fibers
Because they are directly assembled, general plastic
Less rigid and more rigid than Lum
You . For this reason, the packaging bag 1 is in a packaging form in which the back side layer has a relatively small curved surface and the front side layer composed of the rigid rigid laminated film 2 has a three-dimensional shape having a large curved surface. It is also excellent in terms of merchantability.

When the rigidity of the laminated film 3 on the back side provided with the nonwoven fabric as the innermost layer is larger than the rigidity of the laminated film 2 on the front side , the most preferable volume feeling can be obtained. Experimental findings have been found in the present invention.

That is, it has been found in the present invention that even in the case of a plastic film packaging bag (ie, a soft packaging bag), the packaging bag itself may have volume. The volume property of the packaging bag of the present invention can be changed by the difference in rigidity between the laminated films or the difference in characteristics of the nonwoven fabric or the like.

Further, since the packaging bag of the present invention has a three-dimensional shape giving a sense of volume, water generated from a product (for example, fresh fish meat or animal meat, etc.) cannot be used.
Even if it comes into contact with the polyethylene film mixed with the anti-fogging agent of the innermost layer 22 and adheres as water droplets due to the action of the anti-fogging agent, since the substrate on the front side has a curved surface, the water droplets The material easily slides down and is absorbed by the nonwoven fabric of the backing substrate.

When the tensile modulus of elasticity (kg / mm ² ) by the measurement method specified in ASTM-D882 is defined as rigidity,
It has been found by the present inventors that the packaging bag has a volume property if the rigidity is different.

That is, although the rigidity of the plastic film itself can be indicated by several different measurement methods defined from different viewpoints, it can be expressed by a tensile modulus (kg / mm ² ) according to the measurement method specified in ASTM-D882. The present inventors have found that the rigidity is displayed, and when the rigidities are different, the packaging bag of the present invention has excellent volume characteristics with good merchantability.

Preferred embodiments of the difference in rigidity between the base materials constituting the packaging bag of the present invention are described below.

The rigidity between the substrates is determined by the tensile modulus (kg / m
Even if the value indicated as m ² ) differs by about 10 to 30% or more, the packaging bag of the present invention can have a volume property, and water droplets generated in the packaging bag can be easily absorbed by the nonwoven fabric. I can do this.

It has been found in the present invention that such an effect can be more enjoyed even when the stiffness of the indication in the tensile elastic modulus (kg / mm ² ) differs by about 10 times. FIG.
FIG. 1 is a perspective view showing a product in which a product is put in a packaging bag 1 and an opening 7 is heat-sealed. From FIG. 4, it can be seen that the packaging form of the packaging bag 1 gives a volume feeling that the laminated film 2 on the front side has a rounded three-dimensional shape.

Next, another embodiment of the present invention will be described with reference to FIGS.
Will be described. FIGS. 5 and 6 show a configuration in which the innermost layer 32 of the laminated film 3 of the packaging bag 1 of FIG. 1 is partially provided with a nonwoven fabric. FIG. 5 shows a case where the nonwoven fabric 32 a is partially provided in the longitudinal direction of the packaging bag 1.

FIG. 6 shows a case where the nonwoven fabric 32b is partially provided in the longitudinal direction of the packaging bag 1. 5 and 6, by partially providing the nonwoven fabrics 32a and 32b, the products in the packaging bag 1 can be visually recognized even from the back side of the packaging bag 1 so as to enhance the display effect of the products. It was made. In particular, depending on the product, there may be a case where the amount of water absorption may be small.
It is preferable to partially provide 2a and 32b from the viewpoint of the display effect of the product. The following are some specific examples of the present invention. (A) In the above embodiment, the case where a specific synthetic resin is used is described. However, the type of the synthetic resin used in the present invention is not limited, and when the purpose of the present invention is met. Can be used that have the same or similar function.

For example, a thermoplastic synthetic resin can be widely used for a layer in which polyethylene or polypropylene is used. There are no particular restrictions on the laminating means or film forming means. (B) In the above embodiment, the case where the plastic film forming the base material of the packaging bag of the present invention has a specific thickness has been described. There is no particular restriction.

(C) Laminated film 2 constituting packaging bag 1
As the plastic film layer of the outermost layer 20, a plastic film other than those described in the embodiments can be used as long as it has a high barrier property. For example, it is a film obtained by coating a film other than polyester with an ethylene / vinyl alcohol copolymer, polyacrylonitrile, a vapor-deposited film (for example, a vapor-deposited film of aluminum oxide, silica, or aluminum), or a film of bonylidene chloride or nitrified cotton. (D) The intermediate layer 21 of the laminated film 2 includes, for example, polypropylene, ethylene / vinyl acetate copolymer, ionomer, ethylene / acrylic acid copolymer, modified ethylene / acrylic acid copolymer, ethylene / methyl meta Film layers such as acrylate copolymers and modified products of ethylene / methyl methacrylate copolymer can be used. (E) In the innermost layer 22 of the laminated film 2, the following synthetic resins can be used as the synthetic resin for mixing the anti-fogging agent, in addition to those described in the above embodiments.

For example, ethylene / vinyl acetate copolymer,
Linear low density polyethylene (L-LDPE, V-LDP
E and U-LDPE), ionomers, polypropylene, modified products of polypropylene, and the like. (F) In the present invention, there is no particular limitation on the type or amount of the antifogging agent. (G) In the packaging bag 1, a plastic film other than a vinylidene chloride-coated nylon film can be used for the outermost layer 30 of the laminated film 3.

For example, ethylene / vinyl alcohol copolymer, polyacrylonitrile, vapor-deposited film (for example,
Films such as silica / aluminum) and nylon films. (H) In the present invention, a plastic film other than a polyethylene film can be used as the intermediate layer of the laminated film.

For example, ethylene / vinyl acetate copolymer,
Films of linear low-density polyethylene (such as L-LDPE), ionomers, modified ethylene-methyl methacrylate copolymers, modified ethylene-ethyl acrylate copolymers, and the like. (I) The basis weight of the nonwoven fabric used in the present invention can be selected in relation to the characteristics of the product. For example, 9-4
It has been found in the present invention that the use of a nonwoven fabric having a basis weight of about 00 g / m ² is suitable for absorbing the moisture generated in the packaging bag 1.

In particular, it has been found in the present invention that in the case of refrigerated / frozen products (including storage in a chilled region), nonwoven fabrics having a basis weight of that level are sufficient for removing moisture. (J) In the packaging bag of the present invention, when the nonwoven fabric is used, when the embossed nonwoven fabric is used, the packaging form is stabilized, and the packaging form is easily made to be voluminous. Is found in the present invention. (K) It has been found in the present invention that the packaging bag of the present invention is effective for liquids other than water.

A typical example of a liquid other than water is oil (typically, edible oil). The present invention has been found to be similarly effective even when moisture and a liquid other than moisture coexist. (L) The packaging bag of the present invention has no particular restriction on the packaging target. However, the present invention has been found to be particularly effective when used in products that maintain and maintain high quality for a long time in the refrigeration temperature, freezing temperature, or tilt temperature range. For example, fresh food, pasty products, smoked products, etc. (for example, ham, sausage, wiener, etc.).

[0056]

[Effects of the Invention] The purpose of the invention is achieved by the invention. That is, according to the packaging bag of the present invention, first,
It is possible to block intrusion of oxygen or water vapor or other gas into the packaging bag, and to absorb moisture such as water vapor generated from the product in the packaging bag.

Therefore, in the course of distribution or storage, it is possible to keep the product of high quality in the packaging bag for a long period of time.

Secondly, according to the packaging bag of the present invention, it is possible to make the packaging bag have a volume property and it is easy to fill the packaging bag with the product. Can be applied to bags.

Therefore, by using the packaging bag according to the present invention, it is possible to impart a sense of volume to the packaging form without taking any special measures such as nitrogen gas filling, or a tray of expanded polystyrene having a problem of pollution. This makes it possible to give a voluminous feel to the packaging form without the use of. In particular, if the packaging bag according to the present invention is used for a product stored at a refrigeration temperature, a freezing temperature or a tilt temperature range, the packaging bag is often placed in the packaging bag due to various factors such as temperature fluctuation during storage and a temperature difference from the product. Since the moisture generated from the product that has been generated can be removed by the internal mechanism of the packaging bag itself,
Goods can be kept for a long time with high quality.

[Brief description of the drawings]

FIG. 1 is a perspective view of a packaging bag.

FIG. 2 is a perspective view showing a part of the laminated film in a cutaway manner.

FIG. 3 is a perspective view showing a part of the laminated film in a cutaway manner.

FIG. 4 is a perspective view showing a packaging bag containing goods.

FIG. 5 is a perspective view showing another embodiment of the packaging bag of the embodiment.

FIG. 6 is a perspective view showing another embodiment of the packaging bag of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Packaging bag 2 Laminated film 3 Laminated film 4 Side 5 Side 6 Bottom 7 Opening 20 Outermost layer 21 Intermediate layer 22 Innermost layer 30 Outermost layer 31 Intermediate layer 32 Innermost layer 32a Innermost layer 32b Innermost layer

Claims (2)

(57) [Scope of request for utility model registration] (A) a laminated plastic sheet constituting the front side;
Irumu is barrier plastic film preventing plastic film and the outermost sides of the plastic film of the intermediate layer of the innermost layer cloudiness is laminated, structure the backside
The resulting laminated plastic film is
And (b) a laminated plastic film constituting the back side is formed by laminating a plastic nonwoven fabric of an innermost layer and a barrier plastic film of an outermost layer with a plastic film interposed therebetween.
Tensile modulus of elasticity specified in STM-D882 (kg / mm
² ) A packaging bag configured so that the rigidity of the display is larger than that of the laminated plastic film constituting the front side. 2. A refrigeration temperature, a freezing temperature or a tilt temperature range.
Use in the area or / and fresh food, pastry products or smoked
The packaging bag according to claim 1, wherein the packaging bag is provided for packaging an article .