JP2595482Y2 - Pouch film for encapsulation - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention is intended to improve the preservability of contents in packaging of foods, pharmaceuticals, precision mechanical parts, electronic parts, etc., and to laminate them in packaging bags and containers together with the objects to be packaged. The present invention relates to an oxygen-absorbing film.

[0002]

2. Description of the Related Art It is important to remove oxygen from packaging bags or containers in order to improve the preservability of articles to be packaged such as foods, pharmaceuticals, precision machine parts, and electronic parts and extend shelf life. is there.

At present, oxygen scavengers are used to remove the above-mentioned oxygen, but since these oxygen scavengers are almost powdery or granular, they can be used as they are or in the form of tablets into small bags. They are filled into packaging bags or containers in the form of small packages such as filling. However,
In these conventional products, a package having a certain size and a form different from that of the package are to be packaged together with the package, so that the appearance of the packaging bag or the container is impaired or the compactness of the packaging is lacking. In addition, not only does the packaging work sometimes become complicated, but also when the packaged product is a food or a medicine, it is mistaken as a part of the packaged product, which may pose a risk of accidental ingestion or ingestion to consumers.

[0004] For the purpose of preventing the above-mentioned packaging bags and containers from being aesthetically pleasing and compact in packaging, as well as preventing the risk of accidental ingestion and accidental ingestion, a thick plate-like oxygen plate formed by forming a sheet of an oxygen absorber and laminating a plastic film or the like on its surface Absorbent sheets have been proposed, but since they have a certain thickness, the inner oxygen-absorbing film can be easily seen from the end face of the sheet, and when iron powder as an oxygen-absorbing material turns brown due to an oxidation reaction. In addition, there is a problem that the aesthetic appearance of the packaging bag or the container may be impaired or the consumer may be uneasy, and the compactness of the packaging cannot be sufficiently improved due to the large thickness. Further, it has not been possible to completely prevent the complexity of packaging and the danger of accidental eating and accidental ingestion.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and has an aesthetic appearance of a packaging bag or a packaging container and compactness of the packaging, and does not add complexity to the packaging operation. It is an object of the present invention to provide a new thin-walled oxygen-absorbing encapsulating pouch film that has no risk of accidental eating or accidental ingestion.

[0006]

The oxygen-absorbing encapsulating pouch film of the present invention comprises an oxygen-absorbing film A obtained by blending an oxygen-absorbing substance with a thermoplastic resin. The laminated or superposed composite is made up of two upper and lower sheets, with at least one surface of the composite being a breathable film.
Between the upper and lower edges of the absorbent paper.
And pouching as sealed with Lumpur films together
The cross section of the oxygen-absorbing film is not exposed .

As the thermoplastic resin used in the present invention, those generally known as thermoplastic resins such as polyethylene, polypropylene and ethylene-vinyl acetate copolymer are used, and preferably comprise an electrolyte such as iron powder and salt. It is preferable that a film-like material having appropriate flexibility can be formed by extrusion or the like in a state containing the oxygen-absorbing substance.

[0008] As the oxygen-absorbing substance, those used in this kind of field can be used. The oxygen-absorbing substance is composed of iron powder and a substance which generates moisture or ions necessary for oxidizing the iron powder, usually an electrolyte. Usually, salt is used as the electrolyte, but the electrolyte is not limited thereto. In producing the oxygen-absorbing film, an extender such as calcium carbonate or a coloring pigment such as iron oxide may be mixed as necessary in addition to the oxygen-absorbing substance. Although the thickness of the oxygen-absorbing film is not particularly limited, it is usually preferably 0.5 mm or less and about 0.02 to 0.07 mm. The oxygen-absorbing film may be subjected to a perforation treatment in order to improve the air permeability and increase the surface area to increase the oxygen absorption efficiency.

In the present invention, as the absorbent paper B, ordinary kraft paper, Japanese paper, or the like can be used, and these are selected according to the purpose. If necessary, the absorbent paper B may be laminated with polyethylene on one side. Oxygen absorbing film A
When laminating or laminating the absorbent paper B on one or both sides to form a composite, the oxygen absorbent film A is slightly smaller than the absorbent paper B, so that the end face of the oxygen absorbent film A is completely invisible from the outside, which is more advantageous. It is. In forming the composite, the absorbent paper is usually merely superposed, but it may be laminated using an adhesive, and the oxygen-absorbing film A and the absorbent paper B are not displaced during pouching so that they do not shift. Point bonding may be used.

[0010] The air-permeable film is a film having oxygen permeability and moisture permeability so that an oxygen-absorbing substance can act, and any film used as an upper and lower film for a pouch can be used. Specific examples of the sealing film for pouching include, in addition to the above-mentioned breathable film, paper or a laminate thereof. When the material to be laminated is a non-breathable aluminum foil or plastic film, it can be used as a porous film by perforating or the like. The sealing film is preferably a film that can be heat-sealed on four sides easily without affecting the oxygen-absorbing film because it is pouched by a heat lamination method. When paper is used as the sealing film, one of them is a heat-adhesive film, or synthetic paper or plastic laminated paper is used. In addition, as a non-breathable film which does not require breathability, laminated films, such as a polypropylene film, a polyester film / polyethylene film, and an aluminum foil / polyethylene film, are mentioned.

The composite (B + A + B or A + B) is usually prepared by simply absorbing the absorbent paper B on both sides or one side of the oxygen-absorbing film A.
The absorbent paper B plays a role of blocking the influence of heat when pouching the oxygen-absorbing film A, and adsorbing moisture after the pouch to improve the performance of the oxygen-absorbing film. . The application of moisture to the absorbent paper B is performed by holding the pouch film for encapsulation in an oxygen-free moist chamber according to a conventional method. In order to arrange and breathe a breathable film on both sides or one side of the composite, a heat laminating method for a pouch is used. The method of thermal lamination is as follows. At least one side of the composite prepared in advance is passed through a hot roll / holding roll in a state in which the composite is stacked between sealing films as a breathable film, and is fused by heat and pressure. In this method, a single pouch film is integrated. In some cases, the plastic film as the sealing film may be directly laminated to the composite with a molten polypropylene film or the like.

The present invention has a basic structure in which absorbent paper is superimposed on both sides of an oxygen-absorbing film and both sides are pouched with a sealing film. When using the pouch film of the present invention, the surface of the sealing film may be coated with a film having high oxygen permeability, oil resistance, chemical resistance and the like. The surface of a sealing film such as a breathable film may be printed or colored as necessary, and a protective coating may be provided on these surfaces. The encapsulating pouch film of the present invention is not particularly limited, but may have a total thickness of 1 mm or less, preferably 0.5 mm or less.

[0013] The pouch film for encapsulation of the present invention improves the aesthetics of the end face of the film, and is thinner and more flexible. It can also be used as a description. When the packaging form is a bag, it can be loaded into a bag at the same time as the bag making by hanging on a bag making machine.

[0014]

According to the present invention, a composite in which absorbent paper is laminated on both sides of an oxygen-absorbing film slightly smaller than the target size is cut out to an appropriate size, and a sealing film is laminated on both sides of the composite and pouched. To make a pouch film for encapsulation. The encapsulating pouch film is used by inserting it into a packaging bag or container having high oxygen barrier properties together with the object to be packaged. The pouch film for enclosing the present invention seals the sealing film at the position of the end face of the composite film sandwiching the oxygen absorbing film, so that the end face of the oxygen absorbing film is not directly seen, and the pouch film itself is not seen. Oxygen in the packaging bag or container is efficiently absorbed by the pouch film for encapsulation because it improves the appearance and is thin and has a large surface area.
Oxidation of the packaged product and rot caused by the presence of oxygen can be prevented.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments. In addition, in the following examples, a part shows a weight part.

FIGS. 1, 2 and 3 are schematic sectional views showing the structure of each embodiment of the film for enclosing the present invention. FIGS. 1 to 3 show the configuration of the present invention with a space provided between each component, but the actual pouch film is a single film in which all components are in close contact. ing. The same applies to FIG. 10 described later. As oxygen absorbing film 1, 150 parts of commercially available reduced iron powder of 150 mesh and 2 parts of common salt were blended with 100 parts of low density polyethylene, uniformly dispersed, and formed by inflation method.
Was used. As absorbent paper, basis weight 230 g / m ²
Kraft paper was used.

As the air-permeable film of the sealing film, a porous plastic film, the above-mentioned synthetic paper and a laminated sheet of perforated polyester film / perforated polyethylene film / paper / perforated polyethylene film were used. The paper of the laminate sheet is the same synthetic paper as above,
A perforated polyester film and porous polyethylene having a thickness of 80 μm were used. As the porous plastic film, a high-density polyethylene-based film filled with calcium carbonate and stretch-formed to a thickness of 0.06 mm was used. As the non-breathable film, a laminated product of stretched polypropylene film / polyethylene film (thickness 50
μ), a bonded product of polyester film / polyethylene film (60 μ) and a bonded product of aluminum foil / polyethylene film were used.

As a pouching method, lamination was carried out using a commonly used heat laminating apparatus. FIG. 12 schematically shows an example of the heat laminating apparatus. As shown in the figure, the air-permeable film 3 and the non-air-permeable film 4 are superposed on both surfaces of the laminated composite 15 of the oxygen-absorbing film 1 and the absorbent paper 2 by guide rolls 18 and pressed by hot-press rolls 19. Then, the film 3 'around the composite is bonded and pouched by a method in which the film 3' is pressed by the pinch roll 20 and then wound up. The pouched product is cut into individual pouches, or cut into individual pouches when supplied as a rolled product and filled into a packaging bag or the like.

FIG. 1 shows a composite (B + A) in which an absorbent paper 2 is superposed on the upper surface of an oxygen-absorbing film 1 with air-permeable films 3 superposed on both surfaces, or a gas-permeable film 3 on one surface and the other surface. Shows a pouch film for encapsulation in which a non-breathable film 4 is overlaid and pouched. FIG. 2 shows a composite (B +) in which absorbent paper 2 is superposed on both sides of an oxygen-absorbing film 1.
A + B) shows a pouch film for encapsulation obtained by pouching A + B). FIG. 3 shows an example of a composite in which the absorbent paper 2 superposed on both sides is larger than the oxygen-absorbing film 1. By doing so, the oxygen-absorbing film 1 can be completely invisible from the outside.

FIGS. 4, 5 and 6 are schematic sectional views showing examples of the sealing film. FIG. 4 shows a laminated product in which a perforated polyester film 5 / a perforated polyethylene film 6 / a paper 7 / a perforated polyethylene film 8 is laminated in this order from the top and used as a breathable film. 5 shows an example of a bonded product of a stretched polypropylene film 9 / polyethylene film 6, and FIG. 6 shows an example of a bonded product of a polyester film 10 / polyethylene film 6, which are used as non-breathable films. These sealing films are used such that the laminated material shown in the lower part of the figure is inside the pouch.

FIG. 7 shows an example in which, for example, a protective coating layer 11 is provided on the upper surface of a bonded product laminated in the order of perforated polyethylene film 8 / paper 7 / perforated polyethylene film 8. The protective coating layer 11 is permeable to oxygen and has oil resistance and chemical resistance.

FIG. 8 is a sectional view showing an example of use of the pouch film for encapsulation of the present invention. For example, the content is enclosed in an oxygen impermeable bag 13 made of a material obtained by laminating polyethylene on a high barrier polyester film. 2 shows a state in which the pouch film 12 is packaged.

Each of the encapsulating pouch films of each of the above examples is finished to a thickness of about 0.5 to 0.7 mm, and the end face of the film has a sufficiently large area because the oxygen absorbing film is invisible and the appearance is improved, and the film is thin and flexible. The film can be used as a film, and when loaded into a packaging bag or container, the aesthetic appearance of the package is improved and the compactness of the package is obtained. Not only did not cause danger, but also had good oxygen absorption.
Further, in the case of packaging of precision mechanical parts and electronic parts, as shown in FIG. 9, it can be used so as to cover the surface of these parts as the contents 14, similarly to conventional rust-proof paper.

FIG. 10 is an enlarged sectional view showing another embodiment of the present invention, in which an adhesive 16 is applied to the back surface of a pouch film for encapsulation, and the upper surface thereof is covered with release paper 17. In use, the release paper 17 can be removed and adhered to the back surface of the lid of the packaging container or the like, and can be used. By using in this manner, erroneous use can be completely prevented. The adhesive may be applied to the entire surface of one side of the encapsulating pouch film and covered with release paper. The label can be replaced by printing on the surface of the enclosing pouch film or the absorbent paper in the pouch, so that the appearance on the packaging is not spoiled.

FIG. 11 is a perspective view of an example of the pouch film for enclosing the present invention. For example, when pouching by arranging a permeable film on both sides, only the four sides of the permeable film can be heated and heat-sealed, so that the characters, patterns, etc. printed on the surface of the absorbent paper 2 inside or the permeable film can be used. Can be sealed without blurring. Since the pouch film for encapsulation of the present invention can be made more flexible by simply overlapping the oxygen-absorbing film and the absorbent paper, the encapsulation pouch film itself is used as a material constituting one surface of the packaging bag. You can also. in this case,
Needless to say, the pouch film outside the packaging bag is a non-breathable film. When used in this way,
Since the encapsulating pouch film is a part of the packaging bag, of course, the aesthetics of the packaged product and the compactness of the package are important.
The problem of ingestion and ingestion is completely solved.

[0026]

[Effect of the Invention] The sealing pouch film of the present invention differs from the conventional film type in that the upper and lower sealing films are thermally bonded at the position of the end face around the oxygen-absorbing film. Since the end face of the absorbent film is not directly visible, the aesthetic appearance of the end face of the film is improved, the thickness is small, and a material having sufficient flexibility can be obtained by the laminated material, so that it is loaded into a packaging bag or a container. It is easy to improve the appearance of packaging bags and containers, and can be expected to be compact in packaging. In addition, it has a sufficient surface area, and thus has good oxygen absorption.

The encapsulating pouch film of the present invention can be formed into a shape in which a number of pouches are wound up as a tape having a suitable width by forming a continuous film of the upper and lower sealing films. In addition to being easy to rewind, it can be separated into individual pouches while being rewound by a packaging machine, and packed in packaging containers and bags together with items to be packaged.
The encapsulation method is also easy. Furthermore, because it is a film,
By applying printing or the like to the surface, a design effect can be obtained. In addition, the present invention provides various excellent effects, such as a method of applying an adhesive on one surface of a pouch film and attaching the adhesive to the back of a lid of a packaging container in the same manner as a conventional label. is there.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of the present invention.

FIG. 2 is a schematic sectional view showing another embodiment of the present invention.

FIG. 3 is a schematic sectional view showing still another embodiment of the present invention.

FIG. 4 is an enlarged sectional view showing an example of a breathable film.

FIG. 5 is an enlarged sectional view showing an example of a non-breathable film.

FIG. 6 is an enlarged sectional view showing another example of a non-breathable film.

FIG. 7 is an enlarged sectional view showing still another example of a non-breathable film.

FIG. 8 is a cross-sectional view showing an example of a use state of the pouch film for enclosing the present invention.

FIG. 9 is a cross-sectional view illustrating another example of a use state of the pouch film for enclosing the present invention.

FIG. 10 is a cross-sectional view showing an example in which an adhesive is applied to one surface of the pouch film for enclosing the present invention.

FIG. 11 is a partially cutaway side view showing an example of the pouch film for enclosing the present invention.

FIG. 12 shows a schematic diagram of an example of a heat lamination method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oxygen absorbing film 2 Absorbing paper 3 Breathable film 4 Non-breathable film 12 Pouch film for encapsulation 13 Oxygen impermeable bag 14 Contents 15 Complex 16 Adhesive 17 Release paper

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B32B 1/00-35/00 B65D 30/00-30/28 B65D 81/00-81/38

Claims (3)

(57) [Scope of request for utility model registration] An oxygen-absorbing film comprising a thermoplastic resin mixed with an oxygen-absorbing substance, a composite in which absorbent paper such as paper is laminated or overlapped on one or both surfaces, and at least one surface of which is air-permeable. Two upper and lower seals as a film
The outer edge of the absorbent paper is entirely
Irumu by pouching as sealed with each other, oxygen
An oxygen-absorbing encapsulating pouch film, characterized in that the cross section of the absorbent film is not exposed . 2. The pouch film according to claim 1, wherein the oxygen-absorbing substance is a compound comprising iron powder and an electrolyte such as salt. 3. An oxygen-absorbing encapsulating pouch film obtained by adjusting the encapsulating pouch film obtained in claim 1 under high humidity for a certain period of time to give moisture to the absorbent paper.