JP2004059063A - Packaging body excellent in unsealability - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging body in which barrier properties are not decreased without requiring a special processing and which has a butt seaming type back sealing part excellent in unsealability. <P>SOLUTION: The packaging body (10) comprises a composite film (3) manufactured by laminating at least a base material layer (1) and an unsealable sealant layer (2). A notch (12) is made on the end edge of the back sealing part (11) in the width direction. Heat seal layers (4) are formed on the surface of the base material layer of the back sealing part on the side where the back sealing part of the packaging body is fallen down and on the surface of the base material layer of the packaging body main body (15) side overlapped on the back sealing part. Adhesive strength of the unsealable sealant layers each other of the back sealant parts (11) is made smaller than the adhesive strength between the heat seal layer of the back sealing part of the falling-down side and the heat seal layer provided on the base material layer on the packaging body main body side. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a package having a back seal portion of a gasket type having excellent openability, and more particularly to a package having excellent openability similar to tear tape opening.
[0002]
[Prior art]
Conventionally, as a method of opening the package from the back seal portion of a package having a back seal portion of a palm-attached type in which the inner surfaces of both end edges of one film face each other and facing each other, for example, FIG. As shown in FIG. 4, the back seal portion (111) between the two notches (112, 112) inserted in the width direction of the package (110) is picked up with a finger in the direction of the arrow so as to raise the back seal portion. A force was applied along the periphery of the package to tear the film. If tearing was performed along the broken line (b), the same openability as the tear tape was obtained.
[0003]
At this time, between the two notches (112, 112) of the back seal portion (111), the portion where the back seal portion on the surface of the package body was in close contact with the direction in which the back seal portion fell down on the package body was porous-processed. The film is perforated (shaded portion (114)) to make the film easy to tear.
[0004]
When a force is applied in the direction of the arrow and the film surface of the portion (114) that has been subjected to the porous processing or the perforation processing is torn, the back seal is passed over the back seal part (111) to one end (left end) of the package. The film on the part side can be torn.
After reaching one end (left end), change direction and apply force to the other end (right end), which can tear the film on the back side (the one without the back seal part) . After reaching the other end (right end), turn around and apply force to the back seal, tearing the remaining film around the perimeter, and tearing the film around the entire circumference as shown in FIG. it can.
[0005]
However, in this method, there is a problem that a processing step for processing the surface of the film is required to increase the number of steps, a through hole is opened in the film, and a barrier property is reduced.
[0006]
[Problems to be solved by the invention]
The present invention has been made in order to solve the above-mentioned problems relating to the easy-openability of a package having a back seal portion of a jointed type, does not require a special processing step, and does not reduce the barrier property. The present invention relates to a package having a back seal portion of a gas-sticking type which has excellent openability.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 of the present invention is directed to a package having a back seal portion in which the inner surfaces of both edges of one film are opposed to each other and the inner surfaces of both edges of one film are opposed to each other, and the back is stuck. The package is composed of a composite film in which at least a base material layer and an easily peelable sealant layer are laminated, and a notch for tearing is provided in an edge of the back seal portion in a width direction, and the back seal portion of the package is provided. A heat seal layer is formed on the surface of the base material layer on the side of the package body that overlaps with the surface of the back seal portion on the falling back side and the back seal portion, and the adhesive strength between the easily peelable sealant layers on the back seal portion is improved. Characterized in that it is formed to be smaller than the adhesive strength between the heat seal layer of the back seal portion on the fallen side and the heat seal layer provided on the base material layer on the side of the package body opposed thereto. A package with excellent openability That.
[0008]
As described above, according to the first aspect of the present invention, the adhesive strength between the easily peelable sealant layers of the back seal portion is such that the heat seal layer of the back seal portion on the falling side and the base material on the side of the package body facing the heat seal layer. Since it is formed smaller than the adhesive strength with the heat seal layer provided in the layer, when pulling to raise the edge on the front side of the falling back seal part, the back side of the falling back seal part is On the other hand, on the surface side of the back seal portion, the easily peelable sealant layers of the back seal portion are peeled off from each other and can be opened from the back seal portion.
[0009]
In addition, since notches for tearing the back seal portion are formed in necessary portions of the back seal portion in the width direction, when the back seal portion is opened, the notch serves as a trigger, so that opening can be easily continued. .
[0010]
The invention according to claim 2 is the packaging according to claim 1, characterized in that a uniaxially stretched film stretched in a tear direction is used for the base material layer. Body.
[0011]
As described above, according to the second aspect of the present invention, since the uniaxially stretched film stretched in the tearing direction is used for the base material layer, if the back seal portion is torn from the notch, the composite film is stretched. It can be torn almost straight in the direction.
[0012]
A third aspect of the present invention is a package excellent in easy-openability, wherein an auxiliary tearing line is provided in a width direction from a tip of the notch in the first or second aspect of the invention. .
[0013]
According to the third aspect of the present invention, since the tearing auxiliary line is provided in the width direction from the tip of the notch, the package can be easily torn along the auxiliary line.
[0014]
According to a fourth aspect of the present invention, in the first, second or third aspect, an unsealed portion is provided at a leading edge of the back seal portion. It is.
[0015]
As described above, according to the fourth aspect of the present invention, since the unsealed portion is provided at the front end edge of the back seal portion, the composite film of the opposed back seal portion is pinched from the unsealed portion to easily form the package. Can be opened.
[0016]
According to a fifth aspect of the present invention, in the first, second, third or fourth aspect of the present invention, two notches for tearing the back seal portion provided at necessary portions of the back seal portion are provided at regular intervals. It is a package excellent in easy opening property characterized by being made.
[0017]
As described above, according to the fifth aspect of the present invention, the notches for tearing the back seal portion, which are formed at necessary portions of the back seal portion, are provided at two locations at a fixed interval. When the portion is pulled, the package is easily torn in a strip shape from the back seal portion and opened.
[0018]
BEST MODE FOR CARRYING OUT THE INVENTION
BEST MODE FOR CARRYING OUT THE INVENTION A package having excellent openability according to the present invention will be described in detail below based on one embodiment.
The package having excellent openability according to the present invention is, for example, as shown in FIGS. 1 and 2, a package having a back seal portion (11) in which the inner surfaces of both edges of a single film are back-adhered to each other. The body (10) has a structure in which a notch (12) for tearing is provided in an edge of the back seal portion in a width direction.
[0019]
The package is composed of a composite film (3) in which at least a substrate layer (1) and an easily peelable sealant layer (2) are laminated, and the substrate layer of the back seal portion on the side where the back seal portion of the package falls down. A heat seal layer (4) is formed on the surface of the base material layer on the side of the package body (13) overlapping the surface and the back seal portion.
[0020]
The adhesive strength between the easily peelable sealant layers of the back seal portion is smaller than the adhesive strength of the heat seal layer of the collapsed back seal portion and the heat seal layer provided on the base material layer on the bag side opposed thereto. Is what is being done.
[0021]
The package (10) may be in the form of a band as shown, or may be in the form of a bag in which the upper and lower width directions are sealed by a method such as heat sealing.
[0022]
The back seal portion (11) may have the unsealed portion (15) left at the leading edge to hold the film of the unsealed portion, although the opposing composite films may be thermally bonded to the leading edge. By pulling, the easily peelable sealant layers of the back seal portion are more easily peeled off.
[0023]
A notch (12) provided in the width direction at the edge of the back seal portion of the package (10) is used to create a trigger for tearing the back seal portion (11) in the width direction, and is an I-shaped notch. , A V-shaped notch, a U-shaped notch, or any other generally known notch.
[0024]
By providing the tearing auxiliary line (a) on the whole or a part of the package (10) in the width direction from the tip of the notch (12), it is easy to tear the package along the notch (12). become.
The tearing assist line (a) can be easily formed by printing and displaying, and does not affect the gas barrier property because the packaging body (13) is not subjected to porous processing or perforation processing. .
[0025]
The notch (12) provided on the back seal portion (11) is not limited to one, and when two notches are provided at a fixed interval, the back seal portion between the notches (12) and the notch (12) is pulled. Thereby, the package can form a strip-shaped tape from the back seal portion and tear it.
[0026]
Next, the composite film (3) constituting the package will be described.
As the base material layer (1), a known uniaxially stretched plastic film such as a uniaxially stretched polypropylene film, a uniaxially stretched nylon film, or a uniaxially stretched polyester film can be preferably used.
By using the uniaxially stretched plastic film stretched in the tear direction, the composite film can be torn in a substantially straight line by tearing the back seal once.
If necessary, a printed display layer (not shown) can be provided on the front surface or the back surface of the base material layer (1).
[0027]
The easily peelable sealant layer (2) is a sealant layer in which the back seal portion is provided with easy peelability, and a polyolefin resin film of different multilayers can be preferably used. Cohesive peeling and interfacial peeling can be performed with a certain strength in a multilayer.
[0028]
The base material layer (1) and the easily peelable sealant layer (2) can be laminated by a known laminating method such as a dry laminating method.
[0029]
If necessary, an intermediate layer (not shown) may be provided between the base material layer (1) and the easily peelable sealant layer (2).
[0030]
The surface of the base material layer (1) of the back seal part on the side where the back seal part (11) of the package body (10) thus produced has fallen, and the package body (13) overlapping (opposing) the back seal part. A heat seal layer (4) is previously formed on the surface of the base material layer (1) on the side.
[0031]
When this heat seal layer (4) is formed into a package, the package body (13) that overlaps (opposes) the fallen back seal portion with the substrate layer surface on the fallen side of the back seal portion (11). This is for adhering to the base material layer surface.
[0032]
The heat-seal layer (4) is coated with a heat-seal lacquer mainly composed of, for example, an ethylene / vinyl acetate copolymer resin, a polyester resin, or the like by a known coating method such as a gravure coating method to have a coating amount of 3 g / m ² ( It can be formed by coating so as to be on the order of solid content).
[0033]
Here, when the package is formed, the adhesive strength between the easily peelable sealant layers of the back seal portion (11) is such that the heat seal layer of the back seal portion on the falling side and the base material on the side of the package body facing the heat seal layer. It is important that the layer is formed so as to have a lower adhesive strength with the heat seal layer provided on the layer.
[0034]
By doing so, when the composite film outside the back seal portion is pulled, the easily peelable sealant layers of the back seal portion are peeled off from each other, and the package easily starts opening from the back seal portion (FIGS. 2A and 2B). b)).
[0035]
【The invention's effect】
As described above, the package of the present invention does not require a special processing step, and is a package having a back seal portion of a back-and-forth type excellent in easy opening without affecting the barrier property. is there.
In addition, by combining the two notches, the easy peeling property, and the straight-line cutting property in the vertical direction, the same opening property as the tear tape can be obtained without special processing at the time of filling.
This package can be designed in the same manner as long as the seal on the top and bottom is in the form of a back-to-back joint.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing one embodiment of a package having excellent openability according to the present invention.
FIGS. 2A and 2B are cross-sectional explanatory views showing a state of a tear portion of a package having excellent openability according to the present invention, wherein FIG. 2A shows a state before tear-opening, and FIG. Indicates the status.
FIG. 3 is an explanatory view showing an example of a conventional package having excellent openability.
FIG. 4 is an explanatory view showing a conventional tear-open state of a package having excellent openability.
[Explanation of symbols]
Reference Signs List 1 base layer 2 easily peelable sealant layer 3 composite film 4 heat seal layer 10 package 11 back seal 12 notch 13 package body 15 back seal Unsealed part 20 {packaged object a} tearing auxiliary line b {broken line 110} packaging body 111} back seal part 112 {notch 114} point where porous processing or perforation processing is performed

Claims (5)

In a package having a back seal portion in which the inner surfaces of both end edges of one film are opposed to each other and are stuck to the back,
The package is composed of a composite film in which at least a base material layer and an easily peelable sealant layer are laminated, and a notch for tearing is provided in an edge of the back seal portion in a width direction, and a back seal portion of the package is provided. A heat seal layer is formed on the surface of the base material layer on the side of the package body that overlaps with the surface of the base material layer of the back seal portion on the falling side and the back seal portion,
The adhesive strength between the easily peelable sealant layers of the back seal portion is based on the bond strength between the heat seal layer of the back seal portion on the fallen side and the heat seal layer provided on the base material layer on the side of the package body opposite thereto. Characterized in that it is formed to be small in size, and has excellent openability. The package according to claim 1, wherein a uniaxially stretched film stretched in a tear direction is used for the base layer. The package according to claim 1 or 2, wherein a tearing auxiliary line is provided in a width direction from a tip of the notch. The package having excellent openability according to any one of claims 1 to 3, wherein an unsealed portion is provided at a leading edge of the back seal portion. The notch for tearing a back seal part perforated in the required part of the said back seal part is provided in two places with a fixed space | interval, The Claim 1 characterized by the above-mentioned. Packaging with excellent openability.

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