KR101737444B1 - Low price vacuum packaging film - Google Patents

Abstract

The present invention provides a low-cost vacuum packaging film produced by modifying a low-priced blown film. The modification of the blown film is to modify the blown film so as to have characteristics as a packaging material for vacuum packaging. At this time, the BLOWN RATIO is increased to 1.3 times or more to give the physical suitability for the vacuum packaging film. The material of the polymer is limited in order to obtain the characteristics of the vacuum packaging film by applying the characteristics of the blow-off ratio as described above. In the present invention, the specific polymer contained in the material of the film is a metallocene LLDPE (linear low density polyethylene) using a metallocene catalyst and a mixed polymer of octene LLDPE copolymerized with ethylene and an octene monomer as a main material By weight to 70% by weight or more. As the remaining polymer materials, polyolefin-based materials such as LDPE (low density polyethylene), HDPE (high density polyethylene) and PP (polypropylene) are used. The modified vacuum packaging film of the present invention can be laminated with a film having good printing properties in order to impart printing characteristics.

Description

Low price vacuum packaging film [0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum packaging film, and more particularly, to a vacuum packaging film for vacuum packaging in order to refrigerate or refrigerate meat products, meat products, agricultural products and agricultural products processed foods including sausage, ham, foot, smoked duck .

Inspection of packaging film

As a frozen storage film that is used in the market, a film formed by laminating a thermally adherent polyethylene film on a nylon film base layer is used.

The nylon film layer serving as a base layer of the frozen storage laminated film serves to block the transmission of oxygen while imparting the tensile strength of the packaging bag in a packed bag state and the adhesive layer of the polyethylene film film generates adhesive force of the sealing heat- So that the contents do not leak out of the package bag in the packaged state.

market research

The above-mentioned lyophilizer of the nylon rod polyethylene film for freeze storage is expensive.

The reason for this is that the raw material value of nylon is about 2.5 times / kg compared to the price of ordinary polyethylene or polypropylene.

As a remedy, as of August 2013, domestic polyethylene raw materials were 1,700 won - 2,000 won / kg, polypropylene raw materials 1,700 won / kg and nylon raw materials about 5,000 won / kg.

Recent distribution of agricultural products, livestock products, aquatic products and processed foods tend to be provided in a refrigerated or frozen state by vacuum packaging of agricultural products and aquatic products.

Particularly, these movements were found in farmers, fishermen, poultry and swine industries.

As such, inexpensive vacuum packaging films for refrigeration or freezing packaging have become necessary to lower the cost of circulating concentrated aquatic products.

The present invention is to provide a vacuum packaging film for refrigeration or freeze storage at low cost (hereinafter, abbreviated as "refrigeration storage") in view of such trend. In other words, even when a low-priced polymer is used and a product such as a sausage is packaged, it can be closely adhered along the curvature and groove of the surface of the article to be vacuum-packed while filling the gap. do.

As described above, the present invention aims to provide a vacuum packaging film which is manufactured at a low cost and can be vacuum packaged well, and the vacuum is not released after packaging.

If the vacuum packaging film is made of a low-priced polymer, the vacuum packaging is not performed well, or it becomes meaningless if the vacuum is released after packaging.

For example, conventional vacuum packaging films have been widely used in nylon film base film laminated with a polyethylene film laminated. As a base film, a low cost poly (ethylene terephthalate) film is used as a base film, Could not be used for vacuum packaging. For such a reason, in the case of a composite film comprising an adhesive film laminated on a polyester (PET) film base, the vacuum is easily released after packaging, and the packaged product and the packaging bag film are separated from each other. It is exposed to the air in the bag and oxidized.

The lowest priced film on the market is polyethylene blown film. The present invention relates to a low-cost 'refrigeration or freeze storage' vacuum packaging film (hereinafter abbreviated as "refrigeration storage") by regulating the blow-by rate of a film so as to modify a polyethylene blow- .

The present invention provides a low-cost vacuum packaging film produced by modifying a low-priced blown film. The modified low-vacuum packaging film is a multilayered film of polyolefin-based blown film layers containing at least one material selected from polypropylene, polypropylene copolymer, EVOH, and PBT.

The modification of the blown film is to modify the blown film so as to have characteristics as a packaging material for vacuum packaging. At this time, the BLOWN RATIO is increased to 1.3 times or more to give the physical suitability for the vacuum packaging film.

By increasing the blown ratio in the process of manufacturing the blown film, the polymer chains are aligned in the transverse direction, whereby the softness of the polyethylene is changed into a rigid property, so that the formed film has a stiff nature.

When the mechanical strength of the thus formed film is increased, the oxygen permeability is decreased and the plasticity is increased, so that the vacuum packaging is maintained after the vacuum packaging, and the vacuum is not easily released.

In this invention, the material of the polymer is limited in order to obtain the characteristics of the vacuum packaging film by applying the characteristics of the blown film. Concretely, at least 1% by weight of at least one material selected from polypropylene, propylene copolymer, EVOH and PBT is added to the blown film layer.

In the present invention, the specific polymer contained in the material of the film is a metallocene LLDPE (linear low density polyethylene) using a metallocene catalyst and a mixed polymer of octene LLDPE copolymerized with ethylene and an octene monomer as a main material By weight to 70% by weight or more.

As the remaining polymer materials, polyolefin-based materials such as LDPE (low density polyethylene), HDPE (high density polyethylene) and PP (polypropylene) are used.

The modified vacuum packaging film of the present invention can be laminated with a film having good printing properties in order to impart printing characteristics.

The present invention relates to a vacuum packaging material

 Nylon film and polyethylene film are not used.

 Thereby providing a low-cost packaging material for vacuum packaging.

 As a result, agricultural and fishery workers and processing companies

The vacuum packing material cost can be reduced.

1 shows a device for manufacturing a bottom-up flat plate film
Fig. 2 is a schematic view showing a device for producing a double-layer flat plate film

The present invention will be described in detail as follows.

The present invention provides a low-cost vacuum packaging film produced by modifying a low-priced blown film.

Modification of Blown Film

The modification of the blown film is a modification of the blown film so as to have the characteristics as a packaging material for vacuum packaging. The blown film is enlarged to 1.3 times or more as BLOWN RATIO (hereinafter referred to as the expansion ratio) Physical conformance to.

By increasing the blown ratio in the process of producing the blown film, the film is stretched in the cross direction, so that the polymer chains are aligned in the transverse direction. Thus, when the polymer chain is aligned in the transverse direction, the softness of the polyethylene changes into a rigid property, so that the formed film has a stiff nature.

When the mechanical strength of the molded film is increased, the oxygen permeability is reduced and the plasticity is increased, so that the vacuum packaging is maintained after the vacuum packaging, and the vacuum is not released easily.

The blowing temperature is the ratio of the blowing diameter of the film formed at the time of producing the blown film to the diameter of the circular die discharging the blown film.

For example, if the circular die diameter of a blown film production facility is 500 mm, and the film has a blown diameter of 1,000 mm at the time of producing the film, the blown lye is 1000/500, that is, 2.

The larger the ratio of the bloount ratio, the stiffer the film becomes and the more the texture becomes stiff.

The object of the present invention is achieved by applying rigidity to the soft and rigid polymer material by applying the properties of the blow rheology as described above.

In order to obtain the characteristics of the vacuum packaging film by applying the above-mentioned properties of the blown film, the selection of the polymer for preparing the film is very important.

The present invention has tested a number of combinations of materials at this point.

 In the present invention, the material which is modified by blown film to suit the characteristics of the vacuum packaging film is preferably a film

Metallocene LLDPE (linear low density polyethylene) using metallocene as a catalyst and

A mixed polymer of octene LLDPE in which ethylene and an octene monomer are copolymerized is used as a main material in an amount of 70 wt% or more.

As the remaining polymer materials, polyolefin-based materials such as LDPE (low density polyethylene), HDPE (high density polyethylene) and PP (polypropylene) are used.

The present invention produced a polyethylene blown film in accordance with the characteristics of a vacuum pouch.

Manufacture of Blown Film

The manufacturing process of the blown film melts the material in a melted state by heating the material in the extruder. The melted material is formed into a film in a circular dice, air is injected into the tube while the film on the tube extruded from the circular dice is pulled up, and the film is cooled while bubbles are formed.

The film formed in the circular dice may be pulled downward, but this is unreasonable because it is difficult to raise the bubble ratio.

The film formed from the circular dice may be pulled horizontally. (Such a machine is referred to as a 'Yoko machine' in the industry.) In the present invention, such a horizontal drawing device may be used.

Since the vacuum packaging film provided by the present invention is to be packaged for refrigeration or freeze storage, the strength of the film should be maintained even at a low temperature.

Metallocene LLDPE is soft and vaginal compared to other LLDPEs and has the property of retaining strength even at low temperatures.

The metallocene LLDPE using the metallocene catalyst as a material included in the film material of the present invention allows the packaging film to closely adhere to the bony portion of the article to be packed in the vacuum packaging process.

Octane LLDPE copolymerized with ethylene and octene monomer having high stiffness in LLDPE as the material included in the film material in the present invention maintains the bending of a given film well in the initial stage of vacuum packaging, .

The total amount of the metallocene LLDPE and the octene LLDPE used in the present invention is preferably 70 wt% or more of the weight of the film to induce such a desired action.

The blown film may be cut into a half of a circular film to produce a single layer (flat plate), or a double layer film which is a tube.

If the packaging bag is made of the thus-produced film, two sheets of a single film may be superimposed on a flat plate, and three sides of the film may be thermally adhered to form a packaging bag.

The double-layered film produced in the form of a tube can be manufactured into a packed bag by thermally adhering one end while cutting it to an appropriate length.

The blown polyethylene film for vacuum packaging modified as described above may also be used in combination with other films.

The other films are preferably low-cost polypropylene type films having good stretchability. Of course, it is unreasonable to combine nylon film, which is expensive in price, because it is not economical.

When the blown film of the present invention is used only as a single layer, it is difficult to obtain a satisfactory printing fire.

Therefore, when various printing or fine printing necessary for merchandise sale is required for the vacuum packaging film, the low-priced composite film is manufactured by laminating the other low-priced films as described above, so that the characteristics of the vacuum packaging and the printing characteristics can be satisfactorily satisfied.

As a result of the test in the present invention, a polypropylene film which is much lower in price than the nylon film is added to the modified vacuum packaging film, achieving the vacuum packaging target and the printing target simultaneously.

The polypropylene film is an unoriented polypropylene film and is generally referred to as CPP film in the industry. The thickness of the CPP film used was 20 占 퐉.

The polypropylene film may be a stretched OPP film.

The laminate of the film laminate the printed surface of the printed polypropylene film and the blown film of the present invention.

The laminating method is by laminating adhesive (commonly referred to as dry lamination in the industry) by adhesive or extrusion lamination bonding.

The extrusion lamination is performed by inserting a molten film between the imprint film and the reformed blown film of the present invention after the molten film is produced, and pressing the molten film.

The polyethylene film of the present invention and the polyolefin-based film to be laminated may be a single layer film, or a multilayer film. In the case of a multilayer film, at least one layer should consist of the constituent layers of the invention.

The polyolefin-based film laminated with the present invention is more effective when a polyolefin-based film having reduced oxygen permeability is used.

A method of reducing the oxygen permeability can be used in the present invention by mixing a polymer raw material having a low oxygen permeability such as EVOH, PBT, nylon, or PET, or by pressing the film during processing.

The polyolefin-based film laminated in the present invention can also be produced as a polyethylene film and a multi-layered blown film.

When the packaging film is prepared by laminating the polyolefin film, the oxygen permeability is decreased and the tensile strength is increased. In addition, the laminating process of the polyolefin film and the polyethylene film is eliminated, thereby advantageously simplifying the process.

However, a packaging film made of a polyolefin-based film is insufficient in obtaining excellent printing properties. However, there is no problem in manufacturing a low-cost vacuum packaging film as a main object of the present invention.

In the production of the multilayer blown film, as shown in FIG. 1 and FIG. 2, two or more extruders are installed. In each of the extruders, a polymer film for forming a multilayer polyethylene film layer and a polyolefin film layer To prepare a multilayer blown film.

The vacuum packaging film of the present invention includes a vacuum shrink packaging film.

The vacuum shrink film is manufactured by forming a tube in a circular dice, cooling it, and adjusting the blowing degree so that the blow ratio is 1.3 times or more while heating and proceeding the blowing process.

The laminate of the film containing the polypropylene and the propylene copolymer and the polyethylene film of the present invention can be produced as an entire laminate or a partial laminate.

A vacuum packaging film modified by the following technical limitation was prepared.

48% by weight of metallocene LLDPE using metallocene as a catalyst,

48% by weight of octene LLDPE copolymerized with ethylene and an octene monomer,

Low density polyethylene 4 wt%

The blow-

2 times of blown film at the time of production of the blown film

The thickness of the produced film was 80 탆

A vacuum packaging film modified by the following technical limitation was prepared.

48% by weight of metallocene LLDPE using metallocene as a catalyst,

48% by weight of octene LLDPE copolymerized with ethylene and an octene monomer,

Low density polyethylene 4 wt%

The blowing method is horizontal blowing

2 times of blown film at the time of production of the blown film

The thickness of the produced film was 70 mu m

A cpp film having a thickness of 20 占 퐉 was printed on one side

The printed surface of the film of Example 1 and the cpp film was laminated by dry lamination.

A cpp film having a thickness of 20 占 퐉 was printed on one side

The printed surface of the film of Example 2 and the cpp film was laminated by extrusion lamination.

Meat was vacuum packed with the packaging materials of Example 1, Example 2, Example 3, and Example 4, and the packing state was observed.

1. In the initial state of the early stage, in Example 1-4, the adhered state of the package and the packaging film was observed.

2. After 10 days of refrigerated storage, in Examples 1-4, there was no change in the adhered state of the packaging material and the packaging film.

3. After 30 days of cryopreservation, no change in the adhered state of the packaged film and the packaging film was found in Example 1-4.

Measurement of Oxygen Permeability of Vacuum Packaging Film

The oxygen permeability of Example 1 was measured to be 26 cc / m 2 (24 hours).

This oxygen permeability is somewhat higher than that of conventional nylon laminating film, but it is functional as a vacuum packaging material.

The oxygen permeability of Example 3 was measured to be 5 cc / m 2 (24 hours).

This oxygen permeability shows similar oxygen permeability as compared with the conventional nylon laminating film.

In the same oxygen permeability meter, the oxygen permeability of a vacuum packaging film having a thickness of 70 μm composed of nylon and PE was measured, and the oxygen permeability was measured at 3 cc / ㎡ (24 hours).

Reference numeral 10 denotes an extruder, reference numeral 20 denotes a circular die, reference numerals 30 and 31 denote a single-layer vacuum packaging film, reference numeral 33 denotes a double-layer vacuum packaging film, reference numerals 40,

Claims (7)

delete In a vacuum packaging film,
Linear low density polyethylene (LLDPE) with metallocene catalyst and
Octene copolymerized linear low density polyethylene (LLDPE)
At least 70% by weight of a blown film layer
A film comprising a plurality of polyolefin-based blown film layers comprising at least one material selected from polypropylene, polypropylene copolymer, EVOH, and PBT,
The blown ratio of the blown film is 1.3 times or more,
Vacuum packaging The film is characterized by the fact that the vacuum can not be released within 30 days after refrigerated storage.
In the vacuum packaging film,
Linear low density polyethylene (LLDPE) with metallocene catalyst and
Octene copolymerized linear low density polyethylene (LLDPE)
More than 70% by weight
Up blown film or a horizontal blown film
A partially-laminated film of a polyolefin-based film comprising the above blown film and at least one material selected from polypropylene, a propylene copolymer, EVOH, and PBT,
The blown ratio of the blown film is 1.3 times or more,
Vacuum packaging The film is characterized by the fact that the vacuum can not be released within 30 days after refrigerated storage.
In the vacuum packaging film,
Linear low density polyethylene (LLDPE) with metallocene catalyst and
Octene copolymerized linear low density polyethylene (LLDPE)
More than 70% by weight
Up blown film or a horizontal blown film
Among the above blown film and polypropylene, propylene copolymer, EVOH, and PBT
A polyolefin-based film comprising at least one material is used as the entire laminated film
The blown ratio of the blown film is 1.3 times or more,
Vacuum packaging The film is characterized by the fact that the vacuum can not be released within 30 days after refrigerated storage.
The method according to any one of claims 2 to 4,
In a blown film layer having a linear low density polyethylene (LLDPE) of 70% by weight or more
Characterized in that at least 1% by weight of at least one material selected from polypropylene, propylene copolymer, EVOH and PBT is added.
The method according to any one of claims 2 to 4,
The vacuum packaging film is a shrink film.
The method according to any one of claims 3 to 4,
A polyolefin film comprising at least one of polypropylene, a propylene copolymer, EVOH and PBT is characterized in that a printing layer is provided on one side of the film.

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