KR20060050126A - Easily openable packages - Google Patents

Abstract

An object of the present invention is to provide a package which can easily take out the contents.

The package 100 is composed of a laminated film 110, the seal layer of the laminated film 110 includes a coextrusion layer that can be peeled between the layers, a support layer mainly composed of polypropylene, and a polypropylene. And a release layer mainly composed of a resin composition containing polyethylene. A perforation line 111 is formed on the surface of the package 100 to form an opening region 150, and the laminated film 110 is torn along the imaginary line 160 from the opening region 150, and the transverse seal is in that state. The portion 132 may be interlayer peeled off and cut to form a large opening 110a ′.

Description

EASYLY OPENABLE PACKAGES

1 is a perspective view showing one embodiment of a package of the present invention.

FIG. 2 is an enlarged sectional view of the laminated film in FIG. 1. FIG.

3 is a cross-sectional view taken along the line X-X 'in FIG. 1 and is an enlarged view in the vicinity of the horizontal seal portion.

4 is a perspective view illustrating a state in which the cover member is peeled off in FIG. 1.

FIG. 5 is a perspective view illustrating a state in which a laminated film is further torn up to the middle of the horizontal seal portion in FIG. 4. FIG.

FIG. 6 is a sectional view taken along the line X-X 'of FIG. 5, and is an enlarged view of the vicinity of the horizontal seal portion. FIG.

FIG. 7 is a perspective view illustrating a state in which a torn portion is removed in FIG. 5. FIG.

8 is a chart showing the measurement results of the seal strength of Test Example 1 in Examples.

9 is a table showing a sampling method of Test Example 2 in Example.

<Explanation of symbols for the main parts of the drawings>

100: package

110: laminated film

110a, 110a ': opening

111: perforation

112, 113: test piece

120: cover material

121: tongue-shaped piece

131, 132: horizontal seal portion

140: vertical seal portion

150: opening area

160: virtual line

170: release surface

180: cutting start

This invention relates to the package which is easy to take out the content to accommodate.

As a means of opening a pillow packaging bag, which is often used for snacks, etc., it is common to open the vertical sealing portion and the opposite surface of the package with a finger, pull it in a direction perpendicular to the horizontal sealing portion, and peel off the entire horizontal sealing portion. It is done. In addition, it is also widely used to form cutouts such as so-called I notches and V notches on the peripheral seal portion to improve the openability.

On the other hand, as an easy opening means, such as a lid | cover material of a jelly container, the method of using the film which is easy to peel as a seal layer (sealing layer) was performed widely, but in recent years, this easy-to-peel film is a film package such as pillow packaging. The present invention also applies to the heat-sealing portion of the film package body in the state of the so-called "sealing of films which are easy to peel off".

In this case, in the film package body, since all the sealing parts including the opening point become easy sealing, the management of the high seal strength is needed compared with the lid | cover material of a container. For example, the film package is more easily deformed by internal and external pressure than the rigid container, and the bag is easily torn at the time of packaging, distribution, and storage. For example, when the contents are wet tissue or the like, it is necessary to prevent drying during long-term storage at the time of unopening, and high moisture resistance is required. In addition, since the contents may not be used up all at once even after opening, the sealing property other than the necessary opening point needs to be maintained to some extent even after opening. As described above, in sealing films that are easy to peel off the film package body, the contrary performances of proper ease of opening and sealing are inherently higher than that of the lid material of the container, so that the strength of the peripheral seal portion can be more strictly controlled. There is a need.

Although the peeling-easy mechanism of a seal layer has a thing by aggregation peeling, an interlayer peeling, and interface peeling, in order to seal the films which are easy to peel a film package body, as mentioned above, since stable seal strength is requested | required, generally, The sealant of the aggregation peeling type which is considered to be excellent in seal stability is mainly used.

As such a cohesive failure type sealant, for example, Patent Document 1 described below includes a layer (first layer), a polypropylene resin (resin A), and a polystyrene resin containing a polyolefin resin or a polyolefin copolymer resin on a film substrate. (Resin B) and the structure laminated | stacked in order of the layer (2nd layer) containing the resin composition comprised from the graft polymer (resin C) which has a structure in which polystyrene was grafted to polypropylene are disclosed, and 2nd It is disclosed that the resin composition used as a layer is used as a sealant material which shows the ease of opening due to cohesive failure in the seal with the adherend using the polypropylene resin.

On the other hand, for example, in a package containing water-containing contents such as portable wet tissues, there is also a required performance that is small and convenient for carrying and easy to take out the contents. As such a package, for example, Patent Document 2 below discloses an encapsulation bag such as a cosmetic fiber material in which a cutting line is formed in the bag body to form an opening, and a cover member which is peelable through an adhesive is provided therefrom. The film package which has an opening part and can reseal the opening part is disclosed.

[Patent Document 1] Japanese Unexamined Patent Publication No. 2002-361798

[Patent Document 2] Japanese Utility Model Publication No. 59-99974

In the conventional seal layer by cohesive peeling like patent document 1, the seal stability in sealing films which are easy to peel a film package body still inadequate. Particularly, in the case of polypropylene-based peelable sealants having excellent heat resistance, strong film rigidity, and high-speed filling packaging, the sealing conditions in which agglomerated peeling type can obtain appropriate ease of opening are very narrow. There is a problem that the conditions are so weak that the sealing property is insufficient, or that the sealing conditions are too strong so that the ease of opening is often insufficient.

On the other hand, in the case of the package 300 shown in patent document 2, since there is a limit to the size of the opening which can be formed, there exists a problem that it is difficult to take out a content. In particular, when a package is to be miniaturized to be portable, such as a portable wet tissue, there is a limit in increasing the opening area, so this problem becomes remarkable.

This invention is made | formed in view of the above subjects, The objective is the sealing stability superior to the seal | sticker of agglomeration fracture type in sealing films which are easy to peel a film package body, and is easy to open and sealability It is to provide the package which can be done. Moreover, it is providing the package which can enlarge the opening area for taking out the content from a package, using the seal | sticker of such easy peeling films.

Means to solve the problem

More specifically, this invention provides the easily openable package which contains the following structures.

(1) A package comprising a base layer having heat resistance and a laminated film having two or more layers including a heat sealable seal layer, wherein the seal layers are heat sealed to each other, wherein the seal layer is a ball that can be peeled between layers. An extruded layer, wherein the extruded layer is a support layer disposed mainly on the substrate layer side mainly based on polypropylene, and a peeling disposed on the innermost layer of the laminated film mainly based on a resin composition containing polypropylene and polyethylene. The easy opening package which forms the multilayer containing a layer.

According to the easy-opening package of the present invention, since the coextrusion layer that can be peeled off between polypropylene-based layers is used as the seal layer that brings ease of opening, only the innermost layer of the peeling layer is peeled off interlayer. Thereby, in sealing the films which are easy to peel a film package body together, the sealing strength more stable than before can be obtained, and it can be compatible with easy opening and sealing property by wider sealing conditions (temperature, pressure, time). .

In addition, the "base layer" which has heat resistance is a layer which becomes an outermost layer at the time of heat seal, and has heat resistance higher than heat seal temperature, For example, extending polyester, extending polyamide, extending polypropylene etc. uniaxially or biaxially. The film oriented stretched is mentioned. In addition, the "sealing layer" which can be heat-sealed becomes a layer which becomes an innermost layer at the time of heat sealing, and is a layer which can be heat-welded below heat sealing temperature. The "support layer" in the coextrusion layer is a layer that remains on the substrate layer side when the heat seal part is peeled off, and the "peeling layer" in the coextrusion layer is from the support layer when the heat seal part is peeled off. It is a layer that peels off.

(2) The easily openable package according to (1), wherein the polypropylene of the support layer is a homopolymer and the polypropylene of the release layer is a random polymer.

According to this aspect, by making the polypropylene of the support layer a homogeneous polymer having high crystallinity, the rigidity of the film inherent in polypropylene can be obtained, which is suitable for high-speed filling. Moreover, by making the polypropylene of a peeling layer into the random polymer with low crystallinity, compatibility of a support layer and a peeling layer is adjusted suitably, and the ease of opening by interlayer peeling, ie, an appropriate interlayer adhesive strength, can be obtained. In addition, since the polypropylene of the release layer is a random polymer containing ethylene, the compatibility with other components of the release layer of polyethylene increases, so that the release layer can be made uniform, and the release layer can be prevented from cohesive failure. Can be.

In addition, the homopolymer of propylene is a homopolymer of propylene. In addition, the random polymer of propylene is a polymer in which copolymerization monomers, such as ethylene and 1-butene, are contained at random in the propylene chain.

(3) The easily openable package according to (1) or (2), wherein the seal strength of the laminated film is 4 N / 15 mm or more and 7 N / 15 mm or less.

According to this aspect, when sealing strength is made into 4 N / 15 mm or more, sufficient sealing property can be obtained and a bag can be prevented from tearing at the time of manufacture, distribution, and storage of a film package. In addition, even when the contents are wet tissues or the like, the moisture resistance can be maintained to prevent drying of the contents. In addition, appropriate ease of opening can be imparted by setting the seal strength to 7 N / 15 mm or less.

In addition, the said seal strength is a measured value, for example on the conditions of 0.5 second of seal time, 0.98 MPa / cm <2> of seal pressures, and 300 mm / min of tensile velocity of a test piece, The seal strength of the said range is a wide range of seal temperature 140 degreeC-160 degreeC You can get it in the range. Moreover, it does not specifically limit as a seal group, For example, a well-known heat seal tester like test sealer TP-701-C (brand name: Tester Sangyo Co., Ltd. product) can be used.

(4) The easily openable package according to any one of (1) to (3), wherein the package is a pillow package.

Usually, a pillow packaging body is difficult to open without opening means, such as a notch. In this respect, in this invention, a notch is unnecessary and can be opened easily by hand.

(5) The heat seal is provided with upper and lower horizontal seal portions and vertical seal portions formed in the pillow package, and the laminated film is provided with a perforation line to form an opening region for taking out the contents from the pillow package, and the lamination. The film and the peelable lid member are adhered to the surface of the laminated film so as to cover the opening region, and by peeling the lid member, the laminated film is torn from the opening region and continuous from the opening region to the transverse seal portion. The easy opening package as described in (4) in which the tear inducing means which guides tearing of the said laminated | multilayer film is formed so that the opened opening may be formed.

According to this aspect, when a lid | cover material is peeled off, the opening area is isolate | separated and lifted up along a perforation line by the adhesive on the back surface of a lid | cover, and it integrates with a lid | cover material, and falls. Thereby, the area | region enclosed by a perforation line becomes an opening part, and the inlet_outlet of a content is formed. Further, if tearing continues from the opening region along the tearing inducing means, an opening is formed in the opening region over the transverse sealing portion, and part of the transverse sealing has ease of opening, so that the tearing portion can be removed as it is. Can be. Therefore, also in a pillow package, a large opening area can be obtained, the contents can be taken out easily, and convenience is improved.

In addition, the "opening area" formed along the perforation line forms an opening through which the contents can be taken out at the time of opening. For this reason, it is preferable that a perforation line is not closed like a shape used as an opening means, for example, U-shape. The cutting line may be a continuous line or a sewing line.

As a "tear induction means", besides using the stretched film mentioned later, you may form a continuous line or a sewing line in at least one layer of laminated | multilayer film, for example. In this case, it may be formed so as to penetrate the laminated | multilayer film, and may be formed in the state of what is called "half cut" which forms a cut line so that it may become non-penetrating with respect to the thickness direction of a laminated | multilayer film.

(6) The easy-opening package according to (5), wherein the tear inducing means is formed by setting the stretching direction of the stretched film constituting the laminated film as the tearing direction.

According to this aspect, since the stretched film may be used as part of the laminated film, the step of physically forming the tear inducing means separately is unnecessary. Moreover, as a stretched film, the uniaxial or biaxially stretched film with high orientation is preferable, and the uniaxially stretched film of what is called tearability (straight cut property) is more preferable. Such a film is conventionally known, and a commercial item can be used suitably.

(7) The easily openable package according to any one of items (1) to (6), wherein the contents contained in the package are portable wet tissues.

According to this aspect, the portable wet tissue is usually accommodated in a pillow package, and it is necessary to simply take out the wet tissue from there, and since it is a small package, especially a large opening is needed. In this respect, a large opening can be formed in the easily openable package of the present invention, in particular, the package of the above-mentioned (5) or (6), and the wet tissue can be easily taken out. In addition, since the sealing property is also sufficient, it is possible to provide a package that can prevent drying of the contents and withstand long-term distribution.

(8) The easy opening package according to (7), wherein the transverse seal portion is a face seal having a seal width of 2 mm or more.

According to this aspect, in the case of a small pillow package such as the portable wet tissue described above, the width of the upper and lower seal portions is narrowed. Therefore, in order to obtain reliable sealing property, not a line seal but the surface seal of 2 mm or more of seal width may be performed. In the case of such a face seal, the seal strength is usually very high. However, in the case of the easy-open package of the present invention, even when the face seal is 2 mm or more, the easy opening of the seal portion can be obtained, so that a large opening can be easily formed.

Best Mode for Carrying Out the Invention

EMBODIMENT OF THE INVENTION Hereinafter, an example of embodiment of this invention is described based on drawing. In addition, in description of the following embodiment, the same structural requirements are attached | subjected with the same code | symbol, and the description is abbreviate | omitted or simplified.

<Overall Configuration of Easy Open Package>

1 to 3 are views showing an example of an embodiment of an easy-open package of the present invention, FIG. 1 is a perspective view showing an outline of an easy-open package, and FIG. 2 is an enlargement of the laminated film in FIG. 3 is an enlarged view of the vicinity of the transverse seal portion in AA ′ cross-sectional view of FIG. 1.

As shown in FIG. 1, this package 100 is a pillow package composed of a laminated film 110 made of a soft packaging material. 131 and 132 in FIG. 1 are horizontal seal parts of the upper and lower sides, respectively, and there is a vertical seal (back seal) part which is not shown in the center part of the back side of FIG.

As shown in FIG. 1, the perforated line 111 is formed in a U shape on the upper surface side of the laminated film 110 of the package 100. The opening region 150 is provided inside the U-shape by the U-shaped cutting line 111. This opening area 150 becomes a part which is cut-up by peeling of the lid | cover material 120 later. And the lid | cover material 120 which has the tongue-shaped piece part 121 so that the opening area | region 150 may be covered is affixed. The adhesive layer which is not shown in figure is provided in the part except the tongue-shaped piece part 121 of the lower surface side of the lid | cover material 120. As shown in FIG. And the laminated | multilayer film 110 and the lid | cover material 120 are adhere | attached so that peeling is possible through this adhesive layer. "Adhesion" means the state which can be re-peeled and resealed here.

Two parallel tearing induction means 160 continuous from there over the transverse seal part 132 is provided in the extension of the both ends of the U-shape of the cutout line 111 in the upper surface of the laminated | multilayer film 110. As shown in FIG. In this embodiment, the tear inducing means 160 is described as an imaginary line, and in reality, the stretching direction of the stretched film constituting the laminated film 110 coincides with the imaginary line direction, and the orientation of the stretched film is torn. Induction means (160).

<Configuration of Laminated Film>

As the laminated | multilayer film 110 which comprises the packaging body 100, the laminated | multilayer film which has a base material layer and a seal layer is used. 2 shows an example of the configuration of the laminated film 110. This laminated | multilayer film 110 is laminated | stacked by the dry lamination method through an adhesive agent in the order of base material layer A / intermediate | middle layer B / sealing layer C from an outer layer in order.

The seal layer C further includes a coextrusion film comprising a support layer C ₁ disposed on the intermediate layer B side and a release layer C ₂ disposed on the innermost surface. And as shown in FIG. 3, in the horizontal seal part 132 of the package 100, the two laminated | multilayer film 110 is heat-welded by the heat seal. That is, a release layer with each other is C ₂ of the opposing innermost layer do not have a bonding surface by the welding is integral.

As a structure of the laminated | multilayer film 110, a conventionally well-known structure can be used and it is not specifically limited. For example, the two-layer structure of the base material layer / seal layer, the three-layer structure of the base material layer / intermediate layer / seal layer, and the four-layer structure of the base material layer / 1st intermediate layer / 2nd intermediate layer / seal layer etc. are illustrated each from the outer layer side sequentially. can do. The lamination method may be a dry lamination method of laminating through an adhesive or may be laminated by extrusion coating of polyethylene and polypropylene.

<Substrate A and Intermediate B>

As base material layer A (outermost layer), well-known stretched films, such as stretched polyester, stretched polyamide, and stretched polypropylene, can be illustrated. Moreover, as intermediate | middle layer B, barrier layers, such as paper, a nonwoven fabric, aluminum foil, etc. can be combined suitably other than said stretched film. Uniaxial stretching may be sufficient as extending | stretching of a stretched film, and biaxial stretching may be sufficient as it.

<Season floor C>

In the present invention, the seal layer C includes a coextrusion layer that can be peeled between layers, and the coextrusion layer is disposed on the substrate layer A side, and the support layer C ₁ mainly composed of polypropylene, polypropylene and polyethylene A multilayer comprising the release layer C ₂ disposed in the innermost layer of the laminated film mainly is formed mainly from a resin composition containing a film.

The entire seal layer C includes a coextruded layer that can be peeled between layers. It is preferable that the thickness of the seal layer C is 25 micrometers-40 micrometers.

The support layer C ₁ is mainly composed of polypropylene, preferably polypropylene of a homopolymer. The thickness of the support layer C ₁ is preferably in the range of 80% ~90% of the sealing layer C, specifically, it is preferable that 20~35 ㎛.

The release layer C ₂ is mainly composed of a resin composition containing polypropylene and polyethylene, and the polypropylene is preferably a random polymer. The thickness of the support layer C ₂ is preferably a 10% to 20% of the total sealing layer C, Specifically, it is preferred that the 5 ㎛~10 ㎛.

The co-extrusion layer having the above configuration may be formed by a co-extrusion coat, or the co-extrusion film may be laminated by an adhesive agent, polysandwich, or the like. As a coextrusion film, you may use a commercial film. Aroma-TP6 (brand name: Sowadenko Plastic Products) is mentioned as such an interlayer extruded film. In addition, the seal layer C is not limited to the two-layer structure like FIG. 2, The structure of three or more layers may be sufficient as it.

Perforation and Opening Area

The perforated line 111 should just be provided so that the opening area | region 150 may arise, and the shape and length of the perforated line 111 are not specifically limited. In addition, the size of the opening area 150 serving as the ejection opening can be appropriately selected depending on the size of the package 100 and the size or shape of the contents to be ejected. For example, when the contents are a portable wet tissue, it is preferable that the size of the opening area 150 is about 5 x 20 mm to about 40 x 60 mm.

In addition, in this embodiment, the perforated line 111 is a continuous line formed so as to penetrate the film 110, but the perforated line 111 may not necessarily be a continuous line, and may be formed in the sewing line shape.

<Tear induction means>

As described above, in this embodiment, the tear inducing means 160 is described as an imaginary line, and in fact, the stretching direction of the stretched film constituting the laminated film 110 coincides with the direction of the imaginary line. The orientation of the film consists of the tear inducing means 160. Specifically, for example, the base material layer A in FIG. 2 may be a stretched film. Preferably, a uniaxial or biaxially stretched film having high orientation is preferable, and a so-called uniaxially stretched film of so-called tearability (straight cut property) is more preferable. desirable. These stretched films can use a conventionally well-known commercial item.

The tear inducing means 160 is not limited to the above-described stretching orientation, and for example, a cut line may be formed on the laminated film 110. In this case, the cut line may be formed so as to penetrate the laminated film 110, or may be a so-called half cut state, but in order to maintain the sealing property of the whole package, it is preferable that it is a half cut state. In addition, a half cut can be formed only in the base material layer A, for example by well-known methods, such as irradiation of a laser beam or mechanical cut processing.

<Cover material>

As the lid | cover material 120, it is preferable that it is a sheet form which has predetermined rigidity, For example, the laminated film etc. of OPP20micrometer / PET70micrometer can be illustrated. In addition, a well-known hot melt etc. can be used as an adhesive layer.

<Action>

Next, the action of this package 100 will be described with reference to FIGS. 4 to 7. FIG. 4 is a perspective view showing a state in which the lid member 120 is peeled off in FIG. 1, and FIG. 5 is a perspective view showing a state in which the lid member 120 is torn to the middle of the horizontal seal portion 132 along the tear inducing means after peeling. FIG. 6 is an enlarged view of a cross section along a line A-A 'in FIG. 5 and in the vicinity of a horizontal seal portion, and FIG. 7 is a perspective view showing a state where a torn portion is removed.

First, as shown in FIG. 4, in the package 100, the lid | cover material 120 is peeled off in the direction of an arrow from the tongue-shaped piece part 121 side of the lid | cover material 120. FIG. Then, the opening area | region 150 is adhered by the adhesive layer of the back surface side of the lid | cover material 120, and the opening area | region 150 of the laminated | multilayer film 110 is separated and lifted up along the perforation line 111. As shown in FIG. Thereby, the opening part 110a is formed in the upper surface of the laminated | multilayer film 110, and it will be in the state which can visually confirm contents.

Next, as shown in FIG. 5, when the peeling of the lid member 120 is further continued, the laminated film is formed along two parallel imaginary lines 160 formed continuously at both ends of the U-shaped cut line 111. 110 is torn and reaches the horizontal seal portion 132 as it is.

At this time, in the transverse sealing part 132, since the sealing layer C is a sealing layer of an interlayer peeling type, as shown in FIG. 6, a part of the peeling layer C _{2 at} the part caught by the transverse sealing part 132 ( the release layer C _2), the cutting start portion 180 of the upper surface side in FIG. 6 is, here the support layer C ₁ and C ₂ is the release layer is delaminated surface delamination at 170. Thereby, the laminated | multilayer film 110 of the part caught by the horizontal seal part 132 can be easily taken out, and finally, as shown in FIG. 7, over the horizontal seal part 132 in the opening area 150 Larger openings 110a 'may be formed.

As seal strength of the horizontal seal part 132, it is preferable that they are 4 N / 15 mm or more and 7 N / 15 mm or less. If the seal strength is less than 4 N / 15 mm, it is not preferable because seal defects may occur and the sealing property may be degraded, or defective products such as tearing of the bag due to external pressure during distribution and storage may occur. In addition, when the seal strength exceeds 7 N / 15 mm, the tearing portion remains in a state in which easy opening cannot be obtained, which is not preferable. Moreover, according to the easily openable package of the present invention, the above-described values can be obtained under a wider sealing condition (temperature, time, pressure) than in the case of a conventional agglomerated peeling type seal layer. Therefore, management of sealing conditions is easy, and as a result, the incidence rate of defective products, such as a seal defect and a difficult opening, can be reduced.

As described above, the package 100 can form an opening larger than the conventional one, and in addition, since the seal portion has easy opening, the laminated film of the torn portion can be easily removed. Therefore, the contents that are difficult to take out from the package, such as wet tissue, have a small clearance space between the packaging bag and the contents, and the friction is also large, so that a plurality of small products such as screws and confectionery are difficult to be taken out, It is suitably used as a package, for example, to take out the contained object.

In addition, the package 100 may be used alone, or the package 100 may be further accommodated in an outer container. According to this, even if the opening part of the package 100 is exposed after opening, the contents can be protected again by an exterior container.

EXAMPLE

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

<Example 1>

The laminated | multilayer film containing the following specifications, PET12 micrometers / ink / adhesive / aluminum foil 6 micrometers / adhesive / peelable film (I) 35 micrometers was manufactured.

Here, as 35 micrometers of easily peelable film (I), the aroma-TP6 (brand name: Sowadenko Plastic Products Co., Ltd.) of an interlayer peeling type was used. Aroma-TP6 is also a coextruded film comprising 7 μl of a single polypropylene 28 μ / (random polypropylene + polyethylene).

Comparative Example 1

A laminated film containing the following specifications, PET 12μ / ink / adhesive / aluminum foil 6μ / adhesive / easy peeling film (II) 30μ, was prepared.

Here, as a peelable easy film (II) 30 micrometers, the trapane 9151 (brand name: Toray Industries, Inc.) of the aggregation peeling type was used. In addition, Trafan 9151 is a coextrusion film containing 24 micro / (polypropylene + polyethylene) 6 micro of random polypropylene.

Comparative Example 2

A laminated film containing the following specifications, PET 12μ / ink (pattern release varnish) / adhesive / aluminum foil 6μ / adhesive / CPP 30μ, was prepared.

Comparative Example 3

The laminated | multilayer film containing the following specification and 20 micrometers of uniaxially-stretched OPP / ink / adhesive / aluminum foil 6 micrometers / adhesive / peelable easy film (III) was manufactured.

Here, 30 micrometers of easy peeling film (III) is a cohesive peeling type, and is a film containing 5 micrometers of polyethylene 25 micrometers / ethylene copolymers.

<Test Example 1>

About the laminated | multilayer film of Example 1, the comparative examples 1 and 2, it heat-sealed on condition of 0.5 second of sealing time, 0.98 MPa / cm <2> of sealing pressure, 300 mm / min of tensile velocity of a test piece, and 100 to 170 degreeC of sealing temperature, Seal strength was measured by 90 degree T-shaped peeling. The result is shown in Table 1 and FIG. In addition, the numerical unit of Table 1 is N / 15 mm. In addition, it measured using the test sealer TP-701-C (brand name: Tester Sangyo Co., Ltd. make) as a heat seal testing machine sealing machine.

Seal temperature 100 ℃ 110 ℃ 120 ℃ 130 ℃ 140 ℃ 150 ℃ 160 ℃ 170 ℃ Example 1 0.0 0.0 0.0 2.1 4.4 5.7 6.4 8.2 Comparative Example 1 0.0 0.0 1.6 2.1 3.2 6.3 9.9 19.2 Comparative Example 2 0.0 4.3 12.6 19.0 21.0 23.3 32.0 36.4

In Example 1 which used the easily peeling film of an interlayer peeling type from the result of Table 1, FIG. 8, sealing strength is 4 N / 15 mm or more and 7 N / 15 mm or less between seal temperatures 140 degreeC-160 degreeC. It can be seen that the range of seal temperatures that can achieve seal strength (4 N / 15 mm or more and 7 N / 15 mm or less) that can attain both ease of opening and sealing at the same time is about 20 ° C.

On the other hand, in the comparative example 1 using the peeling peeling film of the aggregation peeling type, the seal strength in seal temperature 140 degreeC is low as less than 4 N / 15 mm, and sealing property is inadequate. In addition, the seal strength at the seal temperature of 160 ° C. exceeds 7 N / 15 mm, and the ease of opening is insufficient, and the range of seal temperatures that can achieve the seal strength that can attain both ease of opening and sealing at the same time is 150. It turns out that it is narrower than Example 1 only by ° C. Moreover, in the comparative example 2 (a structure which peels from an ink layer) using a pattern release varnish, the seal | sticker strength in 120 degreeC has already exceeded 7 N / 15 mm, and also the peeling state also produces the cut start part of CPP. It was not so easy to open.

<Test Example 2>

The pillow packaging body was created using the laminated | multilayer film of Example 1 and Comparative Examples 1 and 3, and the measurement of the seal strength of the horizontal seal part, the texture at the time of peeling by hand, and the peeling state were evaluated. The results are collectively shown in Table 2 (Example 1) and Table 3 (Comparative Example 1).

In addition, the pillow package is gusset-shaped, 104 mm in height X 42 mm in width (the state which extended the ear of the horizontal gusset part) X height 18.5 mm, the seal width of the vertical seal part 8 mm, the seal width of the following horizontal seal part 5 mm (face 9), and the sampling of the test piece was provided with the strip | belt of 10 mm width in the horizontal seal part of the upper surface of a bag as shown in FIG. 9, and the test pieces 112 and 113 were evaluated, respectively. In addition, as shown in FIG. 9, the test piece 112 is sampled on the side where the vertical seal 190 does not fall (the horizontal seal is performed in the state of two upper and lower laminated films), and the test piece 113 is the vertical seal 140 ) Was sampled at two places on the side (the horizontal seal is performed in the state of the upper and lower laminated film two pieces + length seal part). And the higher value among the left and right test pieces 112 and 113 was made into seal strength. In addition, a numerical value is an average of n = 4.

Sample Seal temperature touch Seal strength Peeling state    Example 1 110 ℃ ◎ 3.8 Peeling  When we look at release surface, there is not seal 120 ℃ ○ 4.9 Peeling  When it enters the end seal part, the front becomes thin, but peels off to the end. 130 ℃ ○ 5.6 Peeling / breaking  When entering the end seal part, it may break in the middle. 150 ℃ ○ 6.3 Peeling / breaking  When entering the end seal, the second seal line in the middle breaks. 170 ℃ × 7.1 Breaking  Breaking at the end seal edge. If not broken, it is very hard and will not actually open. The fracture state of the edge part is also unstable as the hardened film is broken. 190 ℃ × 8.1 Breaking

Sample Seal temperature touch Seal strength Peeling state    Comparative Example 1 110 ℃ ○ 2.2 Peeling  When we look at release surface, there is not seal 120 ℃ △ 3.4 Peeling  When it enters the end seal part, the front becomes thin, but peels off to the end. 130 ℃ × 7.0 Peeling / breaking  When entering the end seal part, it may break in the middle. If not broken, it felt very hard. 150 ℃ × 9.0 Peeling / breaking  Entering the end seal breaks the second seal line in the middle. As it is broken well, we feel lighter than 130 degrees Celsius. 170 ℃ × 7.0 Breaking  Breaking at the end seal edge. If not broken, it is very hard and will not actually open. Phenomenon Aluminum products and no big cars. 190 ℃ × 6.9 Breaking

From the result of Table 2 and Table 3, in Example 1 which used the easily peeling film of an interlayer peeling type, a touch is favorable in the wide range of seal temperature of 120 degreeC-150 degreeC, and a peeling state is also stable, No break was confirmed.

On the other hand, in the comparative example 1 which used the easily peeling film of the aggregation peeling type, seal strength is inadequate in 120 degrees C or less, On the other hand, in 130 degreeC or more, a touch is inferior and favorable easy opening was not obtained. In addition, in the comparative example 3 using the peeling peeling film of the aggregation peeling type similarly, although the touch when peeling by hand was favorable, the seal strength was inadequate also in all the sealing temperatures.

The present invention can be suitably used as a package for easy opening, for example, a package for portable wet tissue, in which the contents to be contained are easily taken out.

ADVANTAGE OF THE INVENTION According to this invention, in sealing films which are easy to peel a film package body, it is excellent in sealing stability than a cohesive fracture type sealant, and can provide the package body which can make easy opening and sealing property compatible. Moreover, the opening area for taking out the contents from a package can be enlarged using this, and the package suitable for portable wet tissue etc. can be provided.

Claims (8)

As a package which consists of two or more laminated | multilayer films provided with the base material layer which has heat resistance, and the seal layer which can be heat-sealed, and heat-sealed the said seal layers, The seal layer includes a coextrusion layer that can be peeled between layers, and the coextrusion layer is mainly composed of a support layer disposed on the side of the substrate layer mainly using polypropylene, and a resin composition comprising polypropylene and polyethylene. To form a multilayer including a release layer disposed on an innermost layer of the laminated film. The easily openable package according to claim 1, wherein the polypropylene of the support layer is a homopolymer and the polypropylene of the release layer is a random polymer. The easily openable package according to claim 1 or 2, wherein the laminated film has a seal strength of 4 N / 15 mm or more and 7 N / 15 mm or less. The easily openable package according to claim 1 or 2, wherein the package is a pillow package. The horizontal seal portion and the vertical seal portion are formed on the pillow package by the heat seal. The laminated film is provided with a perforation line to form an opening area for taking out the contents from the pillow package body, The laminated film and the peelable cover member are adhered to the surface of the laminated film so as to cover the opening area, By peeling the lid member, tearing inducing means for tearing the laminated film from the opening region and guiding tearing of the laminated film is formed so that a continuous opening is formed in the opening region over the transverse seal portion. Ease of opening package. The easily openable package according to claim 5, wherein the tearing inducing means is formed by setting the stretching direction of the stretched film constituting the laminated film in the tearing direction. The easy opening package according to claim 5, wherein a content contained in the package is a portable wet tissue. The easily openable package according to claim 7, wherein the transverse seal portion is a face seal having a seal width of 2 mm or more.

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