KR20180100932A - A film for vacuum packing and a method for manufacturing the film - Google Patents

A film for vacuum packing and a method for manufacturing the film Download PDF

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Publication number
KR20180100932A
KR20180100932A KR1020170027464A KR20170027464A KR20180100932A KR 20180100932 A KR20180100932 A KR 20180100932A KR 1020170027464 A KR1020170027464 A KR 1020170027464A KR 20170027464 A KR20170027464 A KR 20170027464A KR 20180100932 A KR20180100932 A KR 20180100932A
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KR
South Korea
Prior art keywords
layer
film
vacuum packaging
resin
adhesive
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KR1020170027464A
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Korean (ko)
Inventor
임용수
Original Assignee
비엘티 주식회사
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Priority to KR1020170027464A priority Critical patent/KR20180100932A/en
Publication of KR20180100932A publication Critical patent/KR20180100932A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0021—Combinations of extrusion moulding with other shaping operations combined with joining, lining or laminating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/34—Layered products comprising a layer of synthetic resin comprising polyamides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D65/00—Wrappers or flexible covers; Packaging materials of special type or form
    • B65D65/38—Packaging materials of special type or form
    • B65D65/40—Applications of laminates for particular packaging purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vacuum packaging film for storing a food or a food material in a vacuum state, and the vacuum packaging film of the present invention forms an inner space surrounded by the film by cutting and joining, A first layer formed of a polyolefin resin, a second layer formed of an ethylene vinyl alcohol resin, a second layer formed of a polyolefin resin, and a second layer formed of a polyolefin resin, A third layer formed of a nylon resin, and an adhesive layer formed of a polyurethane resin, and at least one third layer is disposed as an outermost layer of the film, and at least one first layer is formed of a film Wherein at least one adhesive layer is disposed between the second layer and the third layer or between the first layer and the third layer, , Second layer, third layer and the adhesive layer is to form the film are bonded to each other in a molten state as extruded from the extrusion die.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a vacuum packaging film,

The present invention relates to a vacuum packaging film and a manufacturing method thereof, and more particularly, to a vacuum packaging bag or a vacuum packaging pouch which can store foods therein in a vacuum state. More particularly, And a method of manufacturing the same.

BACKGROUND OF THE INVENTION [0003] BACKGROUND OF THE INVENTION [0004] BACKGROUND OF THE INVENTION [0005] BACKGROUND OF THE INVENTION [0005] BACKGROUND OF THE INVENTION [ Can be prevented from being spoiled or corrupted by contact with oxygen.

As one of such vacuum packaging methods, a vacuum packaging bag having a food receiving space therein is manufactured with a vacuum packaging film, and food is put into the vacuum packaging bag, and air is then removed through the open portion of the vacuum packaging bag, A method of thermally bonding and sealing an open portion of a vacuum packaging bag after making the space into a substantially vacuum state is widely used. Vacuum packaging bags or roll films formed by vacuum packaging machines and vacuum packaging films used for such vacuum packaging have also been developed and used.

The film constituting such a vacuum packaging bag must satisfy several conditions.

Firstly, these films are used in such a way that the outside air does not flow into the inside of the bag and the inside of the vacuum packaging bag can be maintained at a low pressure, i.e., in a substantially vacuum state, and the air contained in the food can be prevented from evaporating Or the permeability of water must be low.

Second, these films should be constructed of a flexible material to match the shape of the food contained in the vacuum packaging bag.

Third, the vacuum packaging bag should be made of transparent or translucent material so that the food contained therein can be visually confirmed.

Fourth, these films should be used to store food or food materials, so that no harmful substances should be released from the film material.

Fifth, the vacuum packed bag must have a high tear strength that does not rupture or break due to scratches or impacts. In particular, since the vacuum packed bags are mainly stored in the refrigerator or freezer compartment of the refrigerator, the high and low temperature tear strength Should have.

Sixth, since the vacuum packaging bag is formed by superimposing the film and thermally fusing the frame and sealing the open rim after removing the air from the inner space, it is preferable that the vacuum packaging bag is thermally fused at a low temperature, The film should be able to maintain its shape without forming cracks or pores in the film.

As a vacuum packaging film partially satisfying these requirements, there is a film formed of a nylon resin and formed by bonding an outer layer exposed to the outside and an inner layer formed of a polyethylene resin to form an inner space.

Such a film is formed of a nylon resin as the outer layer, so that it is resistant to impact and rupture at low temperatures and has low permeability to air and moisture. In addition, since the inner layer is formed of polyethylene having a low melting point, it is easy to superimpose the films and heat-seal the edges.

However, since the vacuum packaging of foods is widely used, and in particular, when the food is stored in a vacuum packaging bag for a long period of time in a refrigerator frequently, the outer layer formed of nylon in such prior art films has insufficient ability to block air Do.

Therefore, when storing the food in a vacuum packing bag for a long period of time, the air containing oxygen is infiltrated into the vacuum packing bag, and the food is soaked or decayed and the moisture of the food is discharged to the outside, There is a problem that water is absorbed from the outside and decays.

Since the prior art vacuum packaging film of the above-described construction joins the outer layer and the inner layer of different materials with an adhesive containing an organic solvent, the solvent remains in the film even if the organic solvent evaporates in the step of bonding the outer layer and the inner layer , There is a problem that the organic solvent contaminates the food.

As a vacuum packaging film for solving such a problem, the invention relating to a method for producing a vacuum packaging multi-layer film and a vacuum packaging multi-layer film produced by the method disclosed in Japanese Patent Application Laid-Open No. 10-2005-0106536 (Document 1) have.

The nylon film or the EVOH film is formed of an air barrier layer which is an outer layer and the sealing layer which is an inner layer of the nylon film or the EVOH film is formed of a polyolefin film while applying a polyolefin adhesive resin between them And then subjected to an embossing treatment while passing through a cooling roll and a nip roll to form a vacuum packaging film.

However, in the case of using the nylon resin as the air barrier layer, the air barrier property is low and the sufficient air blocking effect can not be obtained. In the case of using the EVOH resin as the air barrier layer, There is a problem that the cost of the film is considerably increased due to the high price of the EVOH resin, and sufficient air blocking effect can not be obtained when the EVOH resin is thinly used for cost reduction.

Although the polyolefin-based resin is used as an adhesive in the invention of Document 1, the polyolefin-based resin generally has good adhesion with the polyolefin-based resin constituting the sealing layer, but is not highly adhesive to the outer layer of nylon resin or EVOH resin The use of a container solvent for applying an adhesive after extruding the air barrier layer and the sealing layer inevitably causes a problem that harmful components are inevitably left in the vacuum packaging film.

Open Patent Publication No. 10-2005-0106536 (Document 1)

The present invention seeks to provide a film which can satisfy all of the above-mentioned conditions required for a vacuum packaging film constituting a vacuum packaging bag.

Particularly, in consideration of the fact that the film of the prior art has insufficient air barrier properties and that a harmful component to the human body may be contained in the film during the production process of the film, I want to make a film.

The present inventors have paid attention to ethylene vinyl alcohol (EVOH) resin as a material having high barrier properties against air and moisture. EVOH is a material having a high air barrier property but does not have sufficient heat resistance strength for use as a vacuum packaging film and is a material having a high melting point to form a bag by fusing a film or to seal it. Furthermore, since EVOH is a costly material, there is a problem that the manufacturing cost is significantly increased when a vacuum packaging film is produced using the EVOH.

The present inventor intends to find a film which satisfies all of the conditions required for a vacuum packaging film listed in the background art while using EVOH as a material for a vacuum packaging film and minimizes an increase in the manufacturing cost of the film .

The above-described object of the present invention is to provide a vacuum packaging film for storing a food or a food material in a vacuum state,

Wherein the vacuum packaging film forms an inner space surrounded by the film by cutting and joining, and after the air is drawn out in the state that the food or the foodstuff is stored in the inner space, Thermally fused,

A first layer formed of a polyolefin resin, a second layer formed of an ethylene vinyl alcohol resin, a third layer formed of a nylon resin, and an adhesive layer formed of a graft-polymerized anhydride polyethylene resin, ,

Wherein at least one of the third layers is disposed as an outermost layer of the film and at least one of the first layers is disposed as an innermost layer surrounding the inner space of the film, A third layer disposed between the second layer and the third layer, the adhesive layer disposed between the second layer and the third layer,

Wherein the first layer, the second layer, the third layer, and the adhesive layer are extruded from a co-extruder and joined to each other to form a bonded film, and the first layer, Wherein a plurality of grooves having a depth in a direction from the abutting surface toward the outer side are formed by embossing, each of the grooves extending in parallel to each other or intersecting with each other along the plane of the bonded film .

The vacuum packaging film of the present invention comprises nylon having a high tear strength and a high melting point as compared with other synthetic resins as a material for the outermost layer of the film and a polyolefin having a low melting point Based resin as the innermost layer of the film.

With such a constitution, the vacuum packaging film can have a high strength while using EVOH which has a high air barrier property but a low tear strength and a low melting point, and is easy to form a bag by superimposing and fusing a film. In addition, the cost of manufacturing the vacuum packaging film according to the present invention can be reduced by minimizing the content of the expensive EVOH resin.

The polyolefin-based resin is not bonded to the nylon resin or EVOH resin. However, according to the above-mentioned constitution of the present invention, when the first layer made of polyolefin resin is in contact with the second layer made of EVOH resin, the adhesive layer made of an anhydride polyethylene resin graft-polymerized is extruded together with them, So that the first layer and the second layer can be strongly bonded to each other.

In addition, according to the present invention, not only strong layers can be formed between the respective layers by co-extruding the respective layers made of different materials which are difficult to be adhered to each other to form a single bonding film, A complicated process of bonding them by an adhesive after extrusion can be omitted.

In particular, by bonding layers of materials which are difficult to bond with each other by an adhesive layer which does not discharge harmful substances without applying an adhesive containing an organic solvent, the vacuum packaging film of the present invention is a bag for storing food, . ≪ / RTI >

When the vacuum packaging film of the present invention is constituted in this way, the at least one first layer has a total thickness of 5 to 30 탆, the adhesive layers each have a thickness of 5 to 30 탆, It is preferable that the two layers have a thickness of 5 to 20 mu m and the one or more third layers have a total thickness of 20 to 110 mu m.

Extrusion of the film with a thickness of less than 5 占 퐉 in the film extrusion of a polymeric material may cause unevenness of the film thickness and rupture and formation of pores. Therefore, in the present invention, each layer constituting the vacuum packaging film has a thickness of 5 占 퐉 or more .

When the total thickness of the first layer made of nylon resin is more than 30 占 퐉, these layers become strongly rigid and it becomes difficult to process the vacuum packaging film.

The second layer formed of EVOH has strong rigidity when the total thickness exceeds 20 占 퐉, which makes it difficult to process the vacuum packaging film, and the EVOH resin is considerably more expensive than other resins and has a total thickness of 20 占 퐉 It is preferable to set the total thickness to 20 占 퐉 or less because the improvement of the air barrier property is not so large as compared with the increase of the thickness.

The third layer formed of a polyolefin resin forms a groove serving as an air flow channel for drawing air from the vacuum packaging bag to the layer, so that the third layer preferably has a total thickness of 20 mu m or more, And a total thickness of 110 탆 is sufficient for mutual bonding to form a vacuum packed bag. Thus, it is preferred that the total thickness of this layer does not exceed 110 [mu] m.

Since the bonding layer serves to bond only the first layer and the second layer, when the thickness exceeds 30 탆, excessive use of the material and the total thickness of the film are made thick, so that the thickness is set to 30 탆 or less desirable.

The above-described air distribution channel for blowing air out of the vacuum packaging bag may further include a plurality of grooves in the first layer, the plurality of grooves having a depth in a direction from the surface in contact with the inner space of the film to the outer side in a direction perpendicular to the plane of the film And these grooves may be formed in such a manner that they extend in parallel with each other or along the plane of the film.

This groove is formed by co-extruding the first layer, the second layer, the third layer and the bonding layer to form a bonding film, and then the bonding film is heated to the melting temperature of the first layer to pass through the embossing roll, Can be formed in the first layer constituting the inner surface of the film.

Since the first layer has a lower melting temperature than the second and third layers, grooves can be formed in the first layer by embossing the film in a temperature range where only the first layer is melted.

INDUSTRIAL APPLICABILITY As described above, according to the vacuum packaging film of the present invention, by using the EVOH resin having a very high air barrier property as the material of the vacuum packaging film, it is possible to improve the air inflow- A vacuum packaging film satisfying all the requirements for a vacuum packaging film of high tear strength, formation and sealing of a vacuum packaging bag by mutual bonding between films, molding of a vacuum packaging film, conditions not containing harmful substances, and low price .

1 is a sectional view of a vacuum packaging film according to an embodiment of the present invention,
2 is a perspective view of a vacuum packaging bag manufactured using a vacuum packaging film according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Referring to FIG. 1, a vacuum packaging film 10 according to an embodiment of the present invention includes a sealing layer 11, which is a first layer formed of a polyethylene resin and which forms an inner layer of a vacuum packaging bag, a bonding layer 11 formed of a polyurethane resin, An air barrier layer 13 as a second layer formed of an EVOH resin, and an outer layer 14 as a third layer formed of a nylon resin as a layer exposed to the outside from the vacuum packaging bag are stacked in this order Consists of. The sealing layer 11 is provided with recesses 15 in the form of recesses formed on the inner surface by embossing.

2 shows a vacuum packaging bag 20 made of the vacuum packaging film 10 having such a constitution. FIG. 2 shows a state in which the outer layer 14, the air barrier layer 13, and a part of the bonding layer 12 are removed.

 The vacuum packaging bag 20 is obtained by superimposing two vacuum packaging films 10 and thermally fusing three frames 21 to bond the sealing layers 11 of the film to one another, And the like.

The grooves 15 formed in the sealing layer 11 of the vacuum packaging film 10 are arranged parallel to each other and arranged in the direction toward the opening 22 in the vacuum packaging bag 20. [ The grooves 15 may be formed to intersect with each other to form a rectangular pattern.

After the food is put in the vacuum packaging bag 20, the film 10 on both sides of the opening portion 22 is pressed in a vacuum packaging machine (not shown) so that the sealing layers 11 are brought into contact with each other. When the vacuum pump sucks air through the opening 22, air is drawn from the inside of the vacuum packaging bag 20 through the groove 15 and the vacuum packaging film 10 are thermally fused to each other to bond the sealing layers 11 on the inner surface of the film to each other to seal the vacuum packaging bag 20 in a vacuum state.

The sealing layer 11 is formed of a polyethylene resin. Since the melting point of polyethylene is in the range of 115 to 135 占 폚, when the vacuum packaging bag 20 is formed of the vacuum packaging film 10, the vacuum packaging film 10 is overlapped The sealing layer 11 forming the inner surface of the vacuum packaging film 10 is melted and bonded by applying heat in a pressurized state. However, since the remaining layers have a melting point higher than that of the sealing layer, It is not damaged.

The sealing layer 11 as the first layer in the present invention may be any of low density polyethylene, linear low density polyethylene and high density polyethylene, and may be a polypropylene (PP), an ethylene vinyl acetate (EVA), an ethylene acrylic acid copolymer (EAA) Other polyolefin resins including methyl acrylate copolymer (EMA) may also be used.

The outer layer 14 is formed of a nylon resin. The nylon resin is formed using a resin of a product named 'Ultramid B36' manufactured and sold by BASF. This nylon resin is a blend of nylon 6 and nylon 66 and has a melting point of 220 ° C so that the sealing layer 11 is fused by heat bonding when the vacuum packaging film 10 is fused to form the vacuum packaging bag 20 It is not melted or deformed.

Since the outer layer 14 made of this resin forms the outer layer of the vacuum packaging bag 20 because the resin has a high tear strength and particularly a high tear strength at low temperatures, So that the exposed surface of the vacuum packaging bag 20 is not easily damaged.

The EVOH resin constituting the air barrier layer 13 was a resin of the product name "EVAL F171B" manufactured and sold by Kuraray of Japan. When this resin was tested according to the oxygen permeability test specified in Appendix C of ISO 14663-2, it showed a high transmittance of 0.4, mol% ㎤.20 μm / ㎡ .day.atm at 20 ° C and 65% RH.

The anhydride polyethylene resin of the graft polymerization constituting the bonding layer 12 was a resin of the product name 'LE130A' manufactured and sold by Hyundai Engineering Plastics. This resin exhibits a peel strength of 2.8 kg / cm or more when disposed between an air barrier layer such as a polyethylene film and an EVOH film, and is very advantageous for bonding.

The vacuum packaging film 10 according to the present embodiment was manufactured by coextrusion.

First, a polyethylene resin, a polyurethane resin, an EVOH resin and a nylon resin were extruded from a co-extruder.

The outer layer 14 has a thickness in the range of 5 to 30 μm, the adhesive layer 13 has a thickness in the range of 5 to 30 μm, the air barrier layer 12 has a thickness in the range of 5 to 20 μm, Lt; RTI ID = 0.0 > 110 < / RTI >

The film extruded from the co-extruder is cooled and heated again to a melting temperature of about 130 DEG C of polyethylene to pass through the embossing roll formed with the concave-convex pattern so that the sealing layer 11 comes into contact with the embossing pattern of the embossing roll, So that the embossing pattern of the embossing roll was transferred to the layer (11).

The sealing layer 11 was deformed according to the concavo-convex pattern of the embossing roll while passing through the embossing roll. The sealing layer 11 was deformed by the embossing process so that grooves 15 having a depth of 200 to 350 mu m from the surface thereof were formed in parallel to each other on the entire inner surface of the vacuum packaging film 10. [

The embossed vacuum packaging film 10 is cut in accordance with the size of the vacuum packaging bag 20 and the two cut films 10 are superimposed on each other and the three edges 15 are heated to the melting temperature of polyethylene Thereby forming a bag-shaped vacuum packaging bag 20.

In this embodiment, the vacuum packaging bag 20 is manufactured in the form of a bag or a pouch. However, the vacuum packaging film 10 may be overlapped with each other and both sides in the width direction may be thermally fused to form a long vacuum packaging film. have. The vacuum packaging film thus formed may be cut into an appropriate length and sealed in a longitudinal direction by heat sealing in a vacuum packaging machine to form a pouch, which may be used as a vacuum packaging bag.

In the vacuum packaging bag 20 formed as described above, the change in the internal pressure was measured while the open portion 22 was sealed.

In the vacuum packaging bag 20 having high air barrier properties according to the present embodiment, 0.44 to 0.43 bar was maintained after 13 days at an initial pressure of 6 bar. However, in the case of the vacuum packaging bag 20 manufactured using the vacuum packaging film according to the prior art, The pressure was reduced to 0.2 bar under the same conditions.

10: Film for vacuum packaging 20: Vacuum packing bag

Claims (3)

A vacuum packaging film for storing a food or a food material in a vacuum state,
Wherein the vacuum packaging film forms an inner space surrounded by the film by cutting and joining, and after the air is drawn out in the state that the food or the foodstuff is stored in the inner space, Thermally fused,
A first layer formed of a polyolefin resin, a second layer formed of an ethylene vinyl alcohol resin, a third layer formed of a nylon resin, and an adhesive layer formed of a graft-polymerized anhydride polyethylene resin, ,
Wherein at least one of the third layers is disposed as an outermost layer of the film and at least one of the first layers is disposed as an innermost layer surrounding the inner space of the film, A third layer disposed between the second layer and the third layer, the adhesive layer disposed between the second layer and the third layer,
Wherein the first layer, the second layer, the third layer, and the adhesive layer are extruded from a co-extruder and joined to each other to form a bonded film, and the first layer, Wherein a plurality of grooves having a depth in a direction from the abutting surface toward the outer side are formed by embossing, each of the grooves extending in parallel to each other or intersecting with each other along the plane of the bonded film. The method according to claim 1,
Wherein the at least one first layer has a total thickness of 5 to 30 占 퐉 and the adhesive layers each have a thickness of 5 to 30 占 퐉 and the at least one second layer has a thickness of 5 to 20 占 퐉, Wherein the at least one third layer has a total thickness of 20 to 110 占 퐉. A process for producing a vacuum packaging film according to claim 1 or 2,
Co-extruding a polyolefin resin, an ethylene vinyl alcohol resin, a nylon resin, and a graft-polymerized anhydride polyethylene resin constituting the first layer, the second layer, the third layer and the adhesive layer, respectively, to form a bonding film;
Passing the bonding film through an embossing roll to form a plurality of grooves having a depth in a direction toward the outside from a surface in contact with the inner space in a direction perpendicular to the plane of the bonding film
Wherein the film has a thickness of at least 100 nm.
KR1020170027464A 2017-03-03 2017-03-03 A film for vacuum packing and a method for manufacturing the film KR20180100932A (en)

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KR1020170027464A KR20180100932A (en) 2017-03-03 2017-03-03 A film for vacuum packing and a method for manufacturing the film

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Publication number Priority date Publication date Assignee Title
KR20220066569A (en) * 2020-11-16 2022-05-24 정라파엘 Method of forming a preliminary sealing envelop and method of sealing a substrate in a vacuum state using the same

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* Cited by examiner, † Cited by third party
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KR20050106536A (en) 2004-05-04 2005-11-10 바프렉스 주식회사 Process for fabricating embossed multi-film for vacuum packaging and embossed multi-film for vacuum packaging fabricated by the method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050106536A (en) 2004-05-04 2005-11-10 바프렉스 주식회사 Process for fabricating embossed multi-film for vacuum packaging and embossed multi-film for vacuum packaging fabricated by the method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220066569A (en) * 2020-11-16 2022-05-24 정라파엘 Method of forming a preliminary sealing envelop and method of sealing a substrate in a vacuum state using the same

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