KR20140138559A - A laminate film having the line type cutting feature and a package produced by using the same - Google Patents

Abstract

The present invention relates to a laminate film capable of being straightly cut, and to a package, which can be easily opened and is manufactured by using the same. The laminate film includes: a surface base material layer; a notch processing layer laminated under the surface base material; and a sealant layer laminated under the notch processing layer. When the laminate film of the present invention is used, the package, which can be easily and straightly opened, can be manufactured.

Description

[0001] The present invention relates to a laminate film having a linear cutting property and a laminate film produced using the laminate film.

The present invention relates to a laminate film having linear cutting characteristics and an easy-to-open package made using the same.

BACKGROUND ART Conventionally, a bag made of a synthetic resin film or a packaging film made of a packaging material such as a laminate in which it is laminated with an aluminum foil or the like is vertically and horizontally bonded three-dimensionally or four-sidedly to produce an envelope. These envelopes are made of a liquid, a powder, After filling the packages, they are sealed. In addition, food such as yogurt and jam, toothbrush, and blister package for household goods are made by forming a synthetic resin sheet and an aluminum foil composite sheet in close contact with a mold by applying heat or an external force and forming a liquid, powder, , Granules or the like are packed, and a cover film formed by laminating a synthetic resin film or an aluminum foil or the like is sealed to be sealed.

In recent years, in order to open such a packaging body, a packaging portion of a packaging film, which is a packaging material, is cut by a customer using a knife or scissors, or a cut-off inducing groove or a guide cut portion provided at both ends of the package is opened by hand, Or by using a package that has been previously cut and cut in the form of a slit, a seam, or two oblique lines facing each other, and then printed on the inner or outer layer of the film, And packaging materials having increased ease of use.

For the retort packaging or pouch, for example, a film laminate of PET (or OPP) / (ONy) / Al foil / CPP (or LLDPE) is generally used from the front side. As the surface layer, a biaxially stretched polyethylene terephthalate (PET) film or a biaxially stretched polypropylene (OPP) film is used. As the barrier layer, an aluminum foil (AL foil) Propylene (CPP) or linear low density polyethylene (LLDPE) is used. Biaxially stretched nylon (ONy) may be applied as an intermediate support layer in order to improve impact resistance and standability in accordance with the above lamination.

In a package containing such a conventional biaxially stretched nylon (ONy) as a middle support layer, a notch is made for straight cutting, and even if the package is torn in a straight line by hand to use the contents, There is a problem that it is torn in an undesired direction off the tearing position made in the laminate of the laminate and the back surface of the surface.

In the case of the retort pouch, the thickness of the unstretched polypropylene as the heat-bonding layer is set to 50 mu m or more and the total thickness is made to be 80 mu m or more in order to prevent the pouches from breaking or tearing. It becomes difficult to open.

However, in pouches and retort pouches, straightness is often required even when they are easily opened by hand. It has been known to use a stretched high-density polyethylene layer or a biaxially stretched special nylon film which improves straight-line tearing property (JP-A-8-80977, JP-A-2003-236972) And it has the disadvantage of increasing the price.

In addition, a plurality of lines of tear-inducing cutting lines may be previously inserted into the biaxially stretched polyethylene terephthalate (PET) film layer as the surface layer or the biaxially stretched nylon (ONy) layer as the intermediate supporting layer before the laminate is formed, (Japanese Patent Laid-Open No. 11-77872). However, there are various difficulties such as requiring precise adjustment of the film tension in order to align the position of the tear line during the lamination operation.

On the other hand, in the refill detergent pouch, it is known to perform half cutting with a laser to form the opening portion. However, in the case of the laser drilling operation, it is difficult to control only the surface to cut to a certain depth, so that some intermediate support layers are also cut off. In the retort pouch, when the aluminum pouch is immersed in boiling water, There is a high risk of damage or pinholes. Therefore, such a method is not often employed as the opening portion in the retort pouch.

Further, in order to control the depth of laser drilling, a laser-reflecting ink layer is interposed between the surface layer and the barrier layer to control the depth of the rare hole to half-cut the entire film layer (Japanese Patent Laid-Open No. 2010-76835) , It is necessary to pay close attention to handling such as the laser generating apparatus is expensive and the laser generated in the laser reflecting ink is reflected again and returned to the beam generating section of the laser to damage the laser generating apparatus. In the case of consumer goods for which appearance is very important, there are printing restrictions, which can be disadvantageous for marketing.

Under such a background, the present inventors have found that a laminate film comprising a surface base layer, a notch-processed layer laminated on the lower surface of the surface base layer, and a sealant layer laminated on the lower surface of the notched layer, And the notch is formed so as to reach a part or the entirety of the notched layer after passing through the sealant layer, and the notch is formed discontinuously or continuously along the cut-out direction of the laminate film The present invention has been accomplished on the basis of the fact that a laminate film having linear cutting characteristics can be produced by producing a laminated film so as to form a notched line, and that a package having linear straightforward opening properties can be produced using the laminated film.

It is an object of the present invention to provide a laminated film having linear cutting properties.

Another object of the present invention is to provide a package having a straight-line easy-to-open property which is produced by using the laminate film.

In order to solve the above problems, the present invention provides a laminate film comprising a surface base layer, a notched layer laminated on the lower surface of the surface base layer, and a sealant layer laminated below the notched layer,

A notch is formed in the direction of the notched layer from the sealant layer, the notch is formed so as to reach a part or all of the notched layer after passing through the sealant layer, Wherein the laminated film has a straight cut-off characteristic, characterized in that the laminated film is formed discontinuously or continuously to form a notched working line.

Preferably, the laminate film of the present invention may further comprise an aluminum foil layer laminated between the surface substrate layer and the notched layer.

The laminate film having linear cutting characteristics of the present invention can be used for imparting ease of opening of a package, particularly easy straight-forward opening.

As used herein, the term "surface substrate layer" refers to a layer that provides the desired strength to maintain the shape of the film as an outer layer of the laminate film and that primarily provides barrier to external materials.

In the present invention, the surface layer may be formed of a biaxially stretched polyester (PET) film, a biaxially stretched nylon (ONy) film, a biaxially stretched polypropylene (OPP) film, an unoriented polypropylene film, a cellulosic film, Synthetic paper of multiple layers, etc.), metal foil (aluminum foil, etc.), and the like.

In the present invention, the surface-based layer may be a single layer, or may be a multilayer of two or more layers.

In the present invention, the surface layer may be formed of a gas barrier resin layer, an adhesive resin layer, an anchor coat layer, a vapor deposition layer (metal vapor deposition layer or ceramic vapor deposition layer), a printing layer, a top coat layer, And the like.

In the present invention, the thickness of the surface base layer may be as long as a predetermined strength is obtained, and is generally preferably about 0.009 to 0.12 mm.

The term "aluminum foil layer" as used in the present invention means a layer laminated between a surface base layer and a notched layer to enhance barrier properties and mechanical properties.

In the present invention, the thickness of the aluminum foil layer may be about 0.005 to 0.12 mm.

The term "notched layer" used in the present invention is an intermediate layer of a laminate film which provides a path for tearing a film when an external force is applied to the laminate film by hand, And a layer having two functions for protecting the surface layer and the barrier property against the content which does not affect the surface layer. For example, the notched layer may protect the surface-treated substrate layer so that they do not cause corrosion if the surface-treated substrate layer comprises aluminum foil or a metal deposited layer.

In the present invention, the notched layer may be a biaxially oriented polyester (PET) film, a biaxially oriented polypropylene (OPP) film, a biaxially oriented nylon (ONy) film, an ethylene-polyvinyl alcohol copolymer (EVOH) Rhenitrile copolymer (Barex) film and the like can be used.

In the present invention, the notch of the notched layer may be formed to be 10 to 100% of the entire thickness of the notched layer. It is more preferable that the notch of the notched layer is formed so as to reach 30 to 70% of the total thickness of the notched layer, on both sides of the barrier property to the contents and the surface base layer protection.

In the present invention, the thickness of the notched layer is somewhat different depending on the precision of the half-cut (slit) blade and the processing apparatus, but it is possible to make the thickness within a range in which the notch- , And generally about 0.012 to 0.12 mm is appropriate.

As used herein, the term "sealant layer" refers to an adhesive layer for sealing the contents of a package as an inner layer of a laminated film.

In the present invention, the sealant layer may be formed of a low density polyethylene (LDPE), a linear low density polyethylene (LLDPE), a medium density polyethylene (MDPE), a high density polyethylene (HDPE), an ethylene-vinyl acetate copolymer (EVA), an ethylene- Polyethylene-based polymers such as ethylene-unsaturated carboxylic acid copolymer, ionomer and ethylene-propylene copolymer; Polypropylene type polymers such as CPP (Chlorinated Polypropylene); Or various polymers having thermal adhesiveness can be used.

An easy peel sealant layer can be used when the laminate film of the present invention is used as a cover film of a blister package.

In the present invention, the sealant layer may be a single layer or a multilayer of two or more layers.

In the present invention, the thickness of the sealant layer is not particularly limited, but may be about 0.01 to 0.25 mm, mainly about 0.02 to 0.2 mm.

In the present invention, the lamination between the respective layers is not limited to the dry laminate,? Wet lamination, extrusion coating, solution casting, sand lamination, coextrusion, or printing.

In the present invention, the notch lines may be a plurality of spaced apart from each other at regular intervals.

In the present invention, when there are a plurality of the notched lines, it is preferable that the interval between the notched lines is 0.3 to 2.5 mm.

In the present invention, the notched line may be a solid line, a broken line, or a combination of a solid line and a broken line.

As described above, the laminated film having linear cutting characteristics of the present invention is easy to manufacture even when it is torn open by tearing by hand and torn easily by hand, and there is no change in the strength of the film and shape retention is very good. Cover films or pouches are particularly well suited for retort pouches that require high film strength and good shape retention.

The present invention also provides an easy-to-open package made using a laminate film having the above-described linear cutting characteristics.

In the present invention, the package may be in the form of a blister package, a retort package, or a pillow package, but is not limited thereto. That is, the package may be in the form of a blister, a bag, a pouch, a container, or the like, and may be used in various forms.

In the present invention, the package body may be formed with a cutout guide groove formed at a portion where the first cutting is started, and the manufactured package can be easily cut and opened.

Hereinafter, the configuration of the present invention will be described with reference to the drawings.

FIG. 1 schematically shows a cross-sectional structure of a laminated film having linear cutting characteristics of the present invention having three lines of notched lines as an embodiment.

FIG. 2 schematically illustrates a bottom view of a laminate film having linear cutting characteristics of the present invention having three rows of notched lines as an embodiment.

1 and 2 show a laminate film comprising a surface base layer 3, a notched layer 2 laminated on the bottom of the surface base layer, and a sealant layer 1 laminated on the bottom of the notched layer , Notches (4, 4 ', 4 ") are formed from the sealant layer (1) in the direction of the notched layer (2) Is formed so as to reach a part of the notched layer (2) after passing through the notch (4), and notches (4, 4 ', 4 ") are linearly discontinuously or continuously formed along the cut direction of the laminate film, And shows a laminated film having a straight cut-off characteristic that forms a machining line.

FIG. 3 is a schematic diagram of a process for processing a notch on the laminate film of the present invention as an embodiment.

In the present invention, the notch is processed by using a flat half-cut die or a die roll. In the apparatus for manufacturing and packaging a three-side or four-side stick type pouch as shown in FIG. 3, And is manufactured by a relatively simple process by manufacturing a pouch while attaching a half-cut processing device and performing a half cut.

FIG. 4 schematically illustrates a retort pouch package manufactured using a laminate film having a straight cut-off characteristic according to an embodiment of the present invention having three rows of notched lines.

As shown in FIG. 4, the retort pouch package can be manufactured by thermally adhering two laminate films of the present invention.

FIG. 5 schematically illustrates a laminate film having linear cutting characteristics of the present invention having three rows of notched lines and a blister package manufactured using a general molded sheet as an embodiment.

As shown in FIG. 5, the blister pack can be manufactured using the laminated film of the present invention as an opening part.

A laminate film comprising a surface base layer, a notch-processed layer laminated on the lower surface of the surface base layer, and a sealant layer laminated on the undersurface of the notch-processed layer, The notch is formed so as to reach a part or all of the notched layer after passing through the sealant layer, and the notch is formed linearly discontinuously or continuously along the cutting direction of the laminate film to form a notched cutting line By producing the laminate film, it is possible to provide a laminate film having linear cutting characteristics, and it is possible to produce a package having a straight-line easy-to-open property by using the laminate film.

FIG. 1 schematically shows a cross-sectional structure of a laminated film having linear cutting characteristics of the present invention having three lines of notched lines as an embodiment.
FIG. 2 schematically illustrates a bottom view of a laminate film having linear cutting characteristics of the present invention having three rows of notched lines as an embodiment.
FIG. 3 is a schematic diagram of a process for processing a notch on the laminate film of the present invention as an embodiment.
FIG. 4 schematically illustrates a retort pouch package manufactured using a laminate film having a straight cut-off characteristic according to an embodiment of the present invention having three rows of notched lines.
FIG. 5 schematically illustrates a laminate film having linear cutting characteristics of the present invention having three rows of notched lines and a blister package manufactured using a general molded sheet as an embodiment.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

Example  1: retort pouch using the film of the present invention Packaged  Produce

First, a biaxially stretched polyester film having a width of 620 mm and a thickness of 0.025 mm printed in full white was printed on the surface base layer film in black with a register mark printed on the back side and a perforated line printed in gray, , A biaxially stretched nylon film having a thickness of 0.036 mm, and a non-oriented polypropylene having a thickness of 0.080 mm were sequentially laminated by a dry lamination method to prepare a retort food pouch film.

Then, three lines of notched line processing were carried out for straight-forward opening processing of the film. At this time, notched work line processing was performed using a half-cut die roll having a notch line spacing of 0.8 mm and a blade height of 0.10 mm.

Using the above-mentioned notched-line-processed film, both ends of the perforated line were cut into a guide groove having a length of 2 mm, and a pouch having a length of 200 mm and a width of 150 mm and having a width of 5 mm and heat- .

The prepared pouches were filled with 100 ml of water as a large solution, and the upper part was thermally adhered with a width of 5 mm using a thermal bonding apparatus to prepare a retort pouch package filled with a large solution.

Example  2: Using the film of the present invention Blister Packaged  Produce

First, a resist film was printed on the back surface with a resist film on the back surface, and the perforated lines were printed in gray. Thereafter, a stretched polyester film having a width of 520 mm and a thickness of 0.025 mm printed in a full white color, , A stretched polyester film having the same width of 0.036 mm and an eraser film for polyethylene having an equal width of 0.04 mm were sequentially laminated by a dry lamination method to produce a laminated film.

The laminate film was cut to a width of 250 mm, and the cut film was aligned with the register mark to form a 3-line notched line along a perforated line with a press die having a line spacing of 0.6 mm and a blade height of 0.055 mm. Next, a molded sheet in which a non-oriented PET sheet having a thickness of 0.4 mm and a polyethylene film having a thickness of 0.10 mm are bonded by a dry lamination process; The laminate film prepared above was charged into a blister automatic packaging machine to form a formed sheet, heat-bonded while filling with water as a large solution, and a cutout guide groove was formed to prepare a blister package filled with a large solution.

Experimental Example 1: Straightness easy opening and pavement safety test of the package made of the film of the present invention

As a packaging safety test for the retort pouches and the blister packages manufactured in Examples 1 and 2, twelve pressure reducing tests, internal dropping tests, and pouch heating tests were performed as follows.

a. Straightforward opening test; When the prepared pouch or blister package was torn by pulling the perforated line by hand, it was confirmed whether or not it was cut linearly along the perforated line (notched line).

b. Decompression test; The pouch and the blister container filled with the large solution under the reduced pressure of -400 mmHg were reversed and maintained for 5 minutes, and then it was confirmed whether the large solution was leaked.

c. Drop test; At a height of 1.5 m, the pouch and the blister container filled with the large solution were freely dropped to confirm the leakage of the large solution.

d. Pouch heating test; After immersing the pouch in boiling water at 100 ° C, it was held for 20 minutes, and the pouch was checked whether it was broken or not.

The test results are shown in Table 1 below.

Test Methods Example 1 Retort pouch package Example 2 A blister pack Straight-forward opening test Good Good Decompression test clear clear Drop test clear clear Pouch heating test clear - ¹⁾ [Note] 1) In case of blister package, pouch heating test is not performed.

From the results of Table 1, it can be seen that when the laminated film having the linear cutting characteristics of the present invention is used, it is satisfactory in the decompression test, the falling drop test, and the pouch heating test, showing not only the safety of packaging but also the ease of straight- It can be seen that a package which can be opened can be produced.

Claims (1)

A laminate film comprising a surface base layer, a notched layer laminated on the lower surface of the surface base layer, and a sealant layer laminated on the lower surface of the notched layer,
A notch is formed in the direction of the notch processing layer from the sealant layer, the notch is formed to reach 30 to 70% of the notch processing layer after passing through the sealant layer, and a notch is formed along the cutting direction of the laminate film Wherein the laminated film has a straight cut-off characteristic.

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