JP4824078B2 - Easy-open bag-shaped package - Google Patents

Description

  The present invention relates to an easily openable bag-like package capable of easily opening an article to be packaged.

  As an easily openable bag-like package that can be easily opened, the bag-like package can be opened along the side edge of the package. In the case of a tray, even if the bag-shaped package is opened along the side edge of the package, there are few cases where it is difficult to easily remove the packaged items in the tray due to the side edge of the tray. Absent. Therefore, in the case where the tray is loaded, a means for cutting and opening so that the vicinity of the central portion of the packaging film on the upper surface side is opened has been proposed.

  For example, in Patent Document 1, a non-heat seal portion is formed on one end surface of a package, and a linear heat seal portion is formed on the inside thereof, and a part of the heat seal portion is formed from the end surface of the non-heat seal portion. A means has been disclosed in which a notch is formed so as to reach the point, and a long cut is formed along the notch at the time of opening.

Japanese Patent Laid-Open No. 10-230971

However, in this case, since a notch is formed in the non-heat-sealed portion formed on one end surface of the package, unexpected or mischievous tearing force acts during transportation or customer selection, and the packaging film heats. There was a possibility that the sealed portion was cut and the packaged object was exposed. In this case, the heat seal part is formed in a straight line, and the tearing force usually acts not in a direction perpendicular to the direction of the straight heat seal part but in an inclined direction. A part of the part is cut in an inclined manner and stopped, and the heat seal part is in communication with the outside of the package to the extent that one point is not noticed.External oxygen gas and moisture enter the inside, and There was a risk of discoloration and decay.

  In the present invention, even if unexpected or mischievous tearing force acts at the time of transportation or customer's selection, the heat seal part of the packaging film is not easily cut, and the packaged object is exposed and external oxygen, moisture, etc. The surface film on the upper surface side of the non-packaged object is not subject to the discoloration or decay of the packaged object, and the force is applied along the notch formed in the heat seal part when opened. The object of the present invention is to provide a bag-shaped package body having an easy-open property that can be cut into a tape shape and opened in a state where the packaged article can be easily taken out.

The present invention has been made to achieve the above object, seen including a layer of a plastic film of linear cutting resistance, and the inner layer is formed from a laminated plastic film comprising a easily openable plastic film, at least the upper and in the vicinity of the bottom A bag-shaped package having a heat seal portion in the vicinity thereof, wherein at least a part of any one of the heat seal portions is formed with a curved heat seal portion, and the curved heat seal portion is It has a convex shape on the end surface side close to the heat seal part, and the curved heat seal part has an adhesive strength capable of peeling the fused part between the laminated plastic films, and at least the curved heat between laminated plastic film of the starting point of the convex contours and convex contours of the seal portion and is surrounded by a straight line connecting the stop point region are fused,該彎song-like heat A notch is formed only on one side of the laminated plastic film that is bonded to the end of the seal portion where the curved heat seal portion is formed, and the notch is a straight line of the plastic film. have a direction which matches the direction of the cutting property, and has easy-open, wherein the end of the notch meets the starting point or stop point of the convex contour of the curved-shaped hot sealing portion It is a bag-shaped package.

  The laminated plastic film preferably has a stretched plastic film as an outer layer, a straight-cut plastic film as an intermediate layer, and an easily openable plastic film as an inner layer.

  The outer layer is preferably formed of polypropylene, polyester, polyamide, polyvinyl alcohol, polystyrene, or polylactic acid, the intermediate layer is preferably formed of a gas barrier plastic film, and is further formed of a polyamide film or a polyester film. Preferably, the inner layer is formed of a polyethylene multilayer film, a polypropylene multilayer film, a polyethylene copolymer film, or a polypropylene copolymer film, and the notch It is desirable that it is formed at two locations on the seal portion and is connected so as to be substantially U-shaped at the heat seal portion to form a tongue and can be cut into a tape shape.

  According to the bag-shaped package having easy-openability of the present invention, the heat-sealed portion of the packaging film is not easily cut even if unexpected or mischievous tearing force acts during transportation or customer selection. There is no risk of external oxygen and moisture from entering the package, causing decay, and applying force along the notch formed in the heat-sealed part when opening, so that the top surface of the non-package It is possible to provide a bag-like package body having an easy-open property that can be opened in a state in which the surface film on the side is cut into a tape shape and the packaged article can be easily taken out.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1-3, 1 is the bag-shaped package body which has the easy-open property of this invention, Comprising: This bag-shaped package body 1 is mainly the front part 2, the back part 3, the upper heat seal part 4, and both-sides edge heat seal. Part 5, 5, bottom heat seal part 6 and notch 7 are formed. Here, a packaging form in which a bag-like product is formed by a four-way seal is illustrated for the packaging film. However, in addition to a three-sided seal and a joint seal shown in FIG. 9 and a pillow packaging form in which the top and bottom are end-sealed, The present invention can also be applied to various known packaging forms.

  As a packaging film used for the front part 2 and the back part 3, a laminated plastic film is used. Stretched polypropylene, polyester, polyamide, polyvinyl alcohol, polystyrene, polylactic acid film is used for the outer layer of the laminated film, straight-cut plastic film is used for the intermediate layer, and an easily openable plastic film is used for the inner layer. . The straight-cut plastic film of the intermediate layer only needs to be straight-cut and is particularly preferably formed of a stretched polyamide film or a stretched polyester film. The intermediate layer film is preferably an oxygen gas barrier film such as an opaque aluminum vapor-deposited film, a transparent alumina vapor-deposited film, or a silica vapor-deposited film. Since intrusion can be prevented, the object to be packaged can be prevented from being oxidized, and can be stored for a long period of time. The easily openable plastic film of the inner layer is preferably formed of a polyethylene multilayer film, a polypropylene multilayer film, a polyethylene copolymer film, or a polypropylene copolymer film.

  A wide heat seal portion 6 is formed in the vicinity of the top or bottom of the surface portion 2 of the bag-shaped package 1 of the present invention. In FIGS. 6 is formed. A curved heat seal portion 61 is formed at least at a part of the heat seal portion 6, in the drawing, at a substantially central portion, and is bent so as to form a convex shape when viewed from the end face side. In addition, the curved heat seal part 61 may be formed over the full length of the heat seal part 6, and may be not only one but plural. Although the curved heat seal portion 61 is shown as a shape having the same width in the drawing, it is only necessary that the curved heat seal portion 61 has a convex shape when viewed from the end face side, and may have a shape with a changed width. .

  Two notches 7 and 7 are formed between the curved heat seal portion 61 and the bottom edge 62 so as to coincide with the direction of the linear cut property of the intermediate layer of the laminated film. The two notches 7 and 7 are connected so as to be substantially U-shaped in the heat seal portion 6 to form a tongue-like portion 71, which can be lifted to easily apply a tearing force. The film is easily cut into a tape shape along the two notches 7,7.

  Since the bag-shaped package 1 of the present invention is formed as described above, the tongue-shaped portion 71 formed by using the two notches 7 and 7 of the bent heat seal portion formed near the top or near the bottom. When pulled up, tearing proceeds in the notch direction and reaches the convex part of the bent heat seal part formed at a position that matches the notch direction. First, the heat seal part at the convex tip of the convex part is the surface part 2. The fused portions of both inner layers of the back surface portion 3 are peeled off and opened. In the present invention, since at least one part of the heat-sealed portion is curved, the cut line does not reach the inside of the packaging bag until the entire curved heat-sealed portion is opened. Even if it acts, the heat seal part of the packaging film is not easily cut, the packaged object is not exposed, and external oxygen gas and moisture do not enter inside.

  When opening the bent heat seal part, since an openable film is used as the inner layer of the laminate, the fusion part between the front surface part 2 and the back surface part 3 is relatively easy to peel off. Is made easy. In addition, in the state where the tearing exceeds the bent heat seal part, the surface part 2 and the back part 3 are not joined, so that the straight cut property of the intermediate layer of the laminated film is effectively exhibited, and the linear tearing occurs. It is performed and tape-like opening is easily performed.

  In this way, by pulling up the tongue-shaped portion 71 formed by using the two notches 7, 7 of the heat seal portion formed in the vicinity of the bottom portion, the tape is applied to the surface portion 2 of the package 1 as shown in FIG. The package can be cut and can be opened so that the article to be packaged loaded inside the package 1 can be easily taken out.

Example 1
Uses a stretched polypropylene film for the outer layer, a straight-cut plastic film for the intermediate layer (YNCB manufactured by Unitika Ltd.), and a three-layer laminated film using an easy-open plastic film for the inner layer (CMPS-101C manufactured by Tosero Co., Ltd.) Then, as shown in FIG. 1, in the four-side seal packaging form, the curved heat seal portion 61 has a curved shape that is convex outward, and the notches 7 and 7 match the curved heat seal portion 61. The bag-shaped package 1 formed into a tongue 71 was formed.

  Even if an unexpected force is applied to the notches 7 and 7 of the obtained package 1, the cut line does not reach the inside of the packaging bag until the curved heat-sealed portion 61 is completely opened, and an unexpected tear force acts. However, the packaging film does not open easily and is excellent in tampering, but when the tongue-shaped portion 71 is pulled up with the intention of opening, the inner layers of the surface portion 2 and the back surface portion 3 of the curved heat-sealed portion 6 are formed. Since it is made of an easily openable plastic film, it can be opened relatively easily, and since the intermediate layer is made of a straight-cutting plastic film, it has excellent straight-cutting properties and can be easily taped. Could be opened.

  As shown in FIG. 6, the easily openable plastic film of the inner layer (CMPS-101C manufactured by Tosero Co., Ltd.) has the characteristic that the heat seal strength hardly increases even when the heat seal temperature applied during the production of the packaging bag varies. Therefore, it exhibits excellent easy opening properties.

  The intermediate layer was a straight-cut plastic film, and the straight-cut value was 1.5 mm as shown in FIG. As shown in FIG. 7, the value of the cut property is a point b that is torn to a length of 100 mm from the notch a of the end surface along the direction of the cut property of the packaging bag in the inclined direction of the left front direction and the right front direction. It is the result of having measured the maximum deviation | shift amount in c. In addition, the cut test was performed 5 points at each of the left front and right front. As shown in FIG. 8, when a straight-cut plastic film is used for the outer layer and a stretched polypropylene film is used for the intermediate layer, the straight-cut property is 2.8 mm, which is inferior to the straight-cut property. Met.

Comparative Example 1
As shown in FIG. 4, a bag-shaped package was formed in the same manner as in Example 1 except that a linear heat seal portion was formed instead of the curved heat seal portion. As shown in FIG. 5, when the bevel-like portion 71 of the package is pulled up, if an unexpected force is applied to the notches 7, 7 of the resulting package, one of them is opened obliquely, The straight-line cut property and tamper-proof property were inferior.

Comparative Example 2
A bag as in Example 1 except that a stretched polypropylene film is used for the outer layer, a straight-cut plastic film (YNCB manufactured by Unitika Ltd.) for the intermediate layer, and a three-layer laminated film using a polyethylene film (LDPE) for the inner layer. A shaped package was formed. When the tongue-shaped portion 71 of the obtained package was pulled up, the adhesive strength between the surface portion 2 and the back surface portion 3 of the curved heat seal portion was too strong to be opened. As shown in FIG. 6, when the heat seal temperature applied at the time of manufacturing the packaging bag becomes high, the sealant portion becomes a seal between the surfaces, so that the heat seal strength is greatly increased and the polyethylene cannot be opened. .

Comparative Example 3
Same as Example 1 except that a stretched polypropylene film was used for the outer layer, a straight-cut plastic film (YNCB manufactured by Unitika Ltd.) for the intermediate layer, and a three-layer laminated film using an unstretched polypropylene film (CPP) for the inner layer. A bag-shaped package was formed.
When the tongue-shaped portion 71 of the obtained package was pulled up, the adhesive strength between the surface portion 2 and the back surface portion 3 of the curved heat seal portion was too strong to be opened. As shown in FIG. 6, unstretched polypropylene has a heat seal strength that increases when the heat seal temperature applied at the time of manufacturing the packaging bag is increased, and the sealant portion becomes a seal between the faces, and cannot be opened. It is.

It is the top view (a) which shows an example of the four-side seal bag-like package body which has the easy-open property of this invention, and sectional drawing (b) seen from 2 directions. It is a top view which shows the time of the opening start of the four-side seal bag-shaped package body which has the easy-open property of FIG. It is a perspective view which shows the use condition of the four-side seal bag-shaped package body which has the easy-open property of FIG. It is a top view of the bag-shaped package of a comparative example. It is a slope view which shows the unsealing cut property when unexpected force is applied in a comparative example. It is a graph which shows the relationship between the heat seal temperature of the inner layer of a laminated | multilayer film, and heat seal intensity | strength. It is explanatory drawing which shows the tear cut property test method. It is a comparative graph of the linear cut property of a laminated film. It is the top view (a) which shows an example of the pillow bag-shaped packaging which has easy openability, and sectional drawing (b) seen from the TD direction.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bag-shaped package 2 Front part 3 Back part 4 Upper heat seal part 5 Both-sides edge heat seal part 6 Bottom heat seal part 61 Curved heat seal part 62 Bottom edge part 7 Notch 71 Velcro part 8 Joint seal part

Claims (7)

Look including a layer of a plastic film of linear cutting resistance, and the inner layer is formed from a laminated plastic film comprising a easily openable plastic film, there in a bag-like package having a heat seal portion in the vicinity of at least the upper and near bottom Then, a curved heat seal portion is formed on at least a part of any one of the heat seal portions, and the curved heat seal portion has a convex shape on the end surface side close to the curved heat seal portion. The curved heat seal portion has an adhesive strength capable of peeling the fused portion between the laminated plastic films, and at least the convex contour of the curved heat seal portion and the starting point of the convex contour between laminated plastic film of a region surrounded by the straight line connecting the stop point has been fused,該彎song-like heat-sealed portion and該彎songs like heat-sealed portion is formed with Between the end edge of the seal portion being on only one notch formed in the bonded a the laminated plastic film, said notches have a direction consistent with the direction of the linear cutting of the plastic film, and, A bag-like package having easy-openability, characterized in that the end of the notch coincides with the start point or stop point of the convex contour of the curved heat-sealed portion .   2. The easy-open property according to claim 1, wherein the laminated plastic film has a stretched plastic film as an outer layer, the straight-cut plastic film as an intermediate layer, and an easily-openable plastic film as an inner layer. A bag-shaped package body.   3. The bag-shaped package having easy-openability according to claim 2, wherein the outer layer film is made of polypropylene, polyester, polyamide, polyvinyl alcohol, polystyrene, or polylactic acid.   The said intermediate | middle layer is formed with the gas barrier plastic film, The bag-shaped package body which has the easy-open property of Claim 2 or 3 characterized by the above-mentioned.   The said intermediate | middle layer is formed with the polyamide film or the polyester film, The bag-shaped package body which has the easy-open property in any one of the Claims 2 thru | or 4 characterized by the above-mentioned.   The said inner layer is formed with the polyethylene-type multilayer film or the polypropylene-type multilayer film, the polyethylene copolymer film, and the polypropylene copolymer film, The easily openable property in any one of Claim 2 thru | or 5 characterized by the above-mentioned. Bag-shaped package.   The notches are formed at two locations on the heat seal part, connected so as to be substantially U-shaped at the heat seal part, and form a tongue-like part on a part of the laminated plastic film, The bag-shaped package body having easy-openability according to any one of claims 1 to 6, wherein the tongue-shaped portion can cut the laminated plastic film into a tape shape along the notch.

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