JP3069552U - Notch shape of easy-open container - Google Patents

Abstract

(57) [Summary] [Problem] To provide a notch shape that can be easily opened safely and easily opened, and is easy to manufacture. In a shape of a notch for opening provided in a heat seal portion, a maximum width portion of the notch is provided at least 0.5 mm inward in the opening direction of the notch from an opening end of the notch, and a deepest portion of the notch has a notch. A container provided with a shape of a notch of an easy-open container and a shape of a notch of the easy-open container characterized by being smaller than an opening end width.

Description

[Detailed description of the invention]

[0001]

[Industrial applications]

 The present invention relates to a container which can be easily opened safely and easily opened, and is easy to manufacture.

[0002]

[Prior art]

 2. Description of the Related Art In recent years, bag-like containers using a plastic laminate film have been widely used for packaging foods and the like. This is because by laminating several types of plastic films and aluminum foil, the characteristics of each can be added and various conditions such as control of gas barrier properties, aesthetics, and physical strength can be set to a satisfactory level. Also, these containers are often sealed by heat sealing.

[0003] When removing the contents, it is necessary to cut the plastic laminate film. However, when a plastic film such as polyethylene terephthalate or stretched polypropylene is used for the outermost layer, the tearing strength of the film is high, so that a human hand is required. It is extremely difficult to open the package by using a scissor, and it is necessary to use scissors, a kitchen knife, and the like.

[0004] For this reason, a notch is generally provided in the heat seal portion of the bag-shaped container as a trigger for opening and tearing. Once the plastic film starts to be torn, it can be smoothly torn with a weak force.

A typical notch shape is illustrated in FIGS. FIG. 1A is called an I-notch and has a linear cut. FIG. 1B is referred to as a V notch and has a V-shaped notch. FIG. 1C is called a U-notch and has a U-shaped notch. FIG. 1D shows a so-called UV notch, which is provided with a notch that combines a U notch and a V notch.

FIG. 2 illustrates a manufacturing method that is frequently used as a method for easily and efficiently processing a notch, taking a U notch as an example. A hole for forming a symmetrical notch is formed at a required position in the center of the heat seal portion formed in advance on the film, and then cut along the center of the heat seal portion to separate the left and right containers. . In this case, notches are formed on both the left and right containers, and as a result, two notches are formed per container. In this case, it is not possible to cut at the true center of the notch-forming hole, which will result in a slight shift during manufacture. Therefore, it is necessary that the shape of the notch be the same even if the shape is slightly shifted. The V notch is not suitable for this processing method, and the I notch, the U notch, and the UV notch are selected.

[0007] In the case of the I notch, the notch has a corner, but the width or width of the notch is small or narrow. However, it has the drawback that the notch position, that is, the opening position, is very difficult to understand. In the case of V notch, U notch and UV notch, there is an advantage that the position of the notch can be easily identified. However, since there is a width in which the belly of the finger can enter the notch, a cut is made at the corner of the notch. There is a risk of making. This is especially dangerous for relatively thick laminated films, such as retort packaging. On the other hand, if the width of the notch is reduced to avoid this danger, the position of the notch becomes difficult to understand.

As a solution to this, Japanese Patent Application Laid-Open No. 9-323754 proposes that the notch is formed by at least two curves and has no corner. When a notch of this shape is adopted, there is no corner, so there is no need to worry about cutting hands and the position of the notch can be easily understood. However, the manufacturing method as illustrated in FIG. 2 cannot be used for the notch shape exemplified in the patent. The reason is the same as in the case of the V notch.

[0009]

[Problems to be solved by the invention]

 In view of the prior art described in the previous section, the opening position is easy to understand without relying on visual acuity, and even when the finger pad is applied to the notch opening, even if the skin is weak at the corner of the notch opening, it is hard to damage the finger pad and flexible. An object of the present invention is to develop a notch that is safe and can be opened safely and a notch shape that can be easily manufactured.

[0010]

[Means for Solving the Problems]

 The present inventors have searched for a notch shape that allows position confirmation without relying on vision even with an I-notch, and have found that a portion in which a heat seal portion is cut out is provided at a depth from the notch opening along the opening direction. Completed. That is, in the present invention, in the shape of the opening notch provided in the heat seal portion of the bag-shaped container, the maximum width portion of the notch width is provided at least 0.5 mm inward in the opening direction of the notch from the notch opening end. A container provided with the notch shape of the easily-openable container and the notch shape of the easily-openable container, wherein the innermost portion of the notch is smaller than the width of the notch opening end.

[0011]

[Embodiment of the invention]

 The first characteristic of the shape of the notch is that, in the shape of the notch for opening provided in the heat seal portion of the bag-shaped container, the maximum width of the notch is at least 0.5 mm from the open end of the notch in the opening direction of the notch. It has been provided inside. As a result, even in the case of the I notch, the notch depth cutout portion exists, so that the position of the notch can be confirmed without relying on visual acuity. The shape of the maximum width portion of the notch width is an arrow shape, a clover shape, a tree shape, or an egg shape tapered in the opening direction as illustrated in the drawing.

A second feature is that the width of the notch is constant at least 0.5 mm from the notch opening end along the opening direction of the notch. By reducing the width of the notch in the notch opening, the width of the finger does not directly fit into the notch opening even when the belly of the finger touches the notch opening. The risk of making cuts is reduced. Thereby, the notch forming method illustrated in FIG. 2 can be adopted. In the case below this, the notch as designed cannot be formed on both sides of the cut due to processing misalignment that occurs slightly when cutting the hole for forming the notch from the center.

A third feature is the shape of the notch of the easy-open container, wherein the innermost portion of the notch is narrower than the width of the notch opening end. The deepest part of the shape of the notch is a straight line, an acute angle, an ellipse, or a semicircle that concentrates at one point.

The shape of the bag-shaped container of the present invention is not particularly limited, and may be any of a three-side sealed bag, a four-side sealed bag, a stick bag, a gusset bag, a pillow bag, a standing pouch, and the like. It may be a sealed bag or a resealable bag.

[0015]

【Example】

 Hereinafter, the present invention will be described with reference to examples, but the content of the present invention is not limited to only the examples.

[0016] A polyethylene terephthalate (16 μm) / extended nylon (15 μm) / aluminum foil (9 μm) / unstretched polypropylene (a 130 μm thick four-layer film laminated with a urethane-based adhesive by a dry lamination method) Using 80 .mu.m), standing pouches having a sealing width of 10 mm in which opening notches of various shapes were formed by the method illustrated in FIG. 3A to 3C show the shapes of the notches employed. The width of the notch from the container end to 1 mm along the opening direction of the notch is constant at 1 mm, and the maximum notch width is 3 mm. Next, after water was sealed in the obtained pouch, an external appearance check, a feel check by tracing the end of the pouch around the notch with a finger, and an openability check were performed. As a result, the opening position of each of the notch-shaped pouches was easy to understand, and it did not hurt even if the end of the pouch around the notch opening was touched, and the opening was very easy.

[0017]

[Comparative example]

 In the same manner as in Example 1, a standing pouch having a notch shape shown in FIGS. 1A and 1D was manufactured. The width of the notch in FIG. 1A is 0 mm, and the width of the notch at the end of the container in FIG. 1D is 3 mm. When the same evaluation as in Example 1 was performed, the position of the notch was difficult to recognize in the case of FIG. 1A, and the corner of the notch bited into the finger when touching the edge of the pouch around the notch in the case of FIG. 1D. It was painful.

[0018]

[Effect of the invention]

 ADVANTAGE OF THE INVENTION According to this invention, an opening position is easy to understand and easy easy opening is possible, and the container which manufacture is easy can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view showing the shape of a conventional notch.

FIG. 2 is an explanatory view showing a manufacturing method frequently used for notch processing.

FIG. 3 is a plan view showing a notch shape according to the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heat seal part 2 Notch 3 Container end part 4 Cutting position 5 Contents storage part 6 Notch open end 7 Maximum width part 8 Notch deepest part

Claims (6)

[Utility model registration claims] In the shape of an opening notch provided in a heat seal portion of a bag-like container, a maximum width portion of the notch width is at least 0.5 m from an opening end of the notch in an opening direction of the notch.
m, wherein the innermost portion of the notch is narrower than the notch opening end width. 2. The notch shape of an easy-open container according to claim 1, wherein the width of the notch is constant at least 0.5 mm from the notch opening end along the opening direction of the notch. 3. The shape of a notch of an easily-openable container according to claim 1, wherein the shape further in the depth direction than the maximum width portion of the notch width is an arrow shape, a clover shape, a tree shape or an egg shape tapered in the opening direction. 4. The notch shape of an easy-open container according to claim 1, wherein the innermost portion of the notch shape is a linear shape, an acute angle shape, an elliptical shape, or a semicircle, which is concentrated at one point. 5. A sealed container provided with a notch shape of the easily-openable container according to claim 1. 6. A container provided with a notch of the easily-openable container according to claim 1.