JPH07315375A - Paper container - Google Patents

Abstract

PURPOSE:To provide a paper container simple in production, free from trouble in forming process and easy to open. CONSTITUTION:A score 12 is formed from surface layer side the nearly central part of upper folding side wall 3 on one side to define a tab area 11 so shaped as to have a closed lower part and an open upper part and a stopper 14 is provided at or near the upper end of the tab area 11. As an alternative, the score may be formed after attaching reinforcing film to the surface to cover the part becoming the tab area 11. After one side of a top seal part is opened left and right, the tab area 11 is pulled from below to separate the paper layers so as to form a tab piece and the tab piece is then pulled to peel off a seal part inside the top seal part so as to open a paper container. The paper container can be produced merely by providing the score 12 to define the tab area 11 and a stopper 14 or reinforcing film to prevent the breakage of the tab piece. Since the tab piece is not raised before opening the container, the container formation is not hindered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper container suitably used for containing liquid, granular material, fluid substance, etc., and a paper container having a roof-shaped top closure.

[0002]

2. Description of the Related Art Conventionally, as containers for milk and juice,
Close the bottom of the rectangular tubular body by closing the bottom flat,
A so-called Goebeltop-type paper container is widely used in which a liquid, which is the content, is filled therein and the upper part is hermetically sealed in a roof form. To open this paper container,
It is necessary to first peel off one side of the top seal part and spread it to the left and right, then push the spread part from both sides to peel off the inner seal part and cause it, but the sealing strength of the top seal part is strong, so the opening operation is difficult It has become.
Therefore, in order to facilitate the opening operation, various proposals have been made in which another grip member is attached to the upper folded side wall forming the opening (for example, Japanese Utility Model Laid-Open No. 63-128931 and Japanese Utility Model Laid-Open No. 2-66423). No.

[0003]

However, in the type disclosed in Japanese Utility Model Laid-Open No. 63-128931, a part of the knob member is fixed to the folded side wall, so that the knob member is attached. However, in the case of the type disclosed in Japanese Utility Model Laid-Open No. 2-66423, there is a problem in that the picking member interferes during box making and causes trouble.

The present invention has been made in view of the above problems, and an object of the present invention is that the manufacturing is simple, no trouble occurs during the box making, and the opening operation is easy. The purpose is to provide a Gobeltop-type paper container.

[0005]

In order to achieve the above object, the paper container of the present invention is constructed such that the opposite upper folded side walls are folded inward along the respective diagonal ruled lines, and the remaining opposite upper side walls are placed inside. In the paper container with a top closure formed by bending the upper end rib and overlapping the upper folding ribs of the upper folding side wall with the upper folding ribs sandwiched therebetween, and heat-sealing the superposed portion, one upper folding A half cut is inserted from the surface layer side so as to define a knob region having a shape in which the lower part is closed and the upper part is opened in the approximate center of the side wall, and the knob formed when the knob region is peeled from the lower part is the upper part. It is characterized in that a break preventing means for preventing breakage is provided.

The stopper may be provided at the upper end or near the upper end of the picking area to constitute the breakage preventing means, or a reinforcing film covering the portion to be the picking area is attached to the surface. After that, by inserting the half cut from the surface layer side, the breakage preventing means may be configured by the reinforcing film.

[0007]

In the paper container of the present invention having the above-described structure, after the top seal portion is spread to the left and right, the tab area is delaminated by pulling the tab area from below to delaminate the paper layer, and the tab piece is formed. By pulling, the seal portion inside the top seal portion is peeled off, and the opening operation is performed. In this case, the stopper or the reinforcing film plays a role of preventing breakage of the tab.

Embodiments of the present invention will be described below with reference to the drawings.

[0009]

1 is a perspective view showing a paper container according to an embodiment of the present invention. The paper container 1 is made by assembling a blank 2 shown in a development view of FIG. 2 by a known procedure. That is, the blank 2 is folded along the vertical ruled lines a and b, and the adhesive margin piece A is attached to the back side of the adhesive portion B on the opposite side to form a flat shape. Next, after raising it into a rectangular tube shape in the filling machine, closing the bottom flatly to close the bottom, and filling this with liquid, the upper folding side walls 3 and 4 facing each other are formed along diagonal ruled lines c and d, respectively. It folds inwardly, the remaining opposite upper side walls 5, 6 are bent inward, and the upper end ribs 7, 8 sandwich the upper end folding ribs 9, 10 of the upper folded side walls 3, 4 to form a four-fold superposition. The top portion is hermetically sealed to the roof mold by heat sealing and bonding the polymerized portion to form the top closure.

The paper container 1 of this embodiment stores milk and juice, and a blank 2 for assembling the same is formed by punching out a packaging material having polyethylene layers laminated on both sides of a paper layer. Then, at the time of punching, the blank 2 is provided with ruled lines necessary for assembly, and as shown in an enlarged view in FIG.
A half cut 12 is inserted from the surface layer side so that a vertical U-shaped gripping region 11 is defined in the center of one of the upper folding side walls 3 with a space left between the upper folding wall 9 and the upper folding rib 9. Here, the half cut 12 is provided at a depth that penetrates the polyethylene layer on the front side and reaches the middle of the paper layer. The half cut 12 may be inserted in the final unit of the printing machine that prints the pattern on the packaging material.
In addition, in the present embodiment, the picking region 11 is located between the two diagonal ruled lines c on the upper folded side wall 3, and
The lower end of the knob region 11 is set to hang on the boundary between the upper folded side wall 3 and the side wall 13 below it, and the ruled line e at the boundary between the upper folded side wall 3 and the side wall 13 is pulled out so as not to hang on the lower portion of the knob region 11. It is provided. Blank 2 like this
After punching, a stopper 14 made of a polyethylene film piece is heat-sealed laterally between the upper end of the picking area 11 and the upper folding rib 9.
It should be noted that the portion where the stopper 14 is sealed may be unprinted in order to improve the sealing effect. The blank 2 thus prepared is assembled as described above to prepare the paper container 1.

To open the paper container 1, as shown in FIG. 1, the top seal portion having the knob region 11 is peeled off to open the upper folding side wall 3 to the left and right, and then the knob region 11 is peeled from the lower end and pulled. As a result, the paper layers are separated from each other, as shown in FIG.
The knob 15 is formed as shown in FIG. In this case, since the lower end of the picking area 11 is slightly floated by bending the ruled line c, the picking area 11 can be picked up from the lower end using this portion as a starting point. And
When the tab 15 is pulled as it is, the delamination of the paper layer stops at the stopper 14, and the stopper 14 and the upper fold side wall 3 are pulled near the upper end, whereby the inner seal portion is peeled off and the upper fold rib 9 is caused. And an opening is formed.

The picking area 11 defined by the half cut 12 is not limited to the simple U-shape as in the above embodiment, but has a shape in which the lower part is closed and the upper end is open, and is peeled off from the lower end. As long as you can
Any shape may be adopted as illustrated in FIG. The picking area 11 shown in FIG. 5 is shaped so that the lower side of the U-shape is a right angle, and the picking area 11 shown in FIG.
The upper end of the letter is widened outward. Also, FIG.
The knob region 11 shown in FIG. 8 has a U-shaped lower portion that is widened, and the knob region 11 shown in FIG. 8 has a shape in which the middle of the U-shape is expanded outward. In addition, in the case shown in FIG. 9, two diagonal ruled lines c on the upper folded side wall 3 are used.
The picking area 11 is provided so as to cover almost all the portion surrounded by.

Further, in order to make it easier to pick the picking area 11, it is preferable that the lower end of the picking area 11 hangs on the boundary between the upper folded side wall 3 and the lower side wall 13 as in the above embodiment. 2-10m downward from ruled line e
It is good to locate it at about m, preferably 2 to 5 mm. Further, although not shown, the folding ruled line e at the boundary between the upper folded side wall 3 and the side wall 13 is a grip region 1
It does not matter if it is in 1. That is, part of the ruled line e may be formed in a straight and continuous state without being omitted.

The stopper 14 provided at the upper end of the picking area 11 as a break preventing means is not limited to the above-mentioned polyethylene film piece. In addition to this, a film piece of an arbitrary thermoplastic resin or a film piece in which a thermoplastic resin is laminated at least on the seal side (for example, PE / PET,
PE / NY / OPP or the like) may be used, and the means for attaching these film pieces is not limited to the heat sealing described above, but may be means such as ultrasonic sealing or high frequency sealing. In addition, an adhesive tape such as an adhesive / PE, an adhesive / PET, an adhesive / OP, or the like may be attached, or a fibrous material such as a string or a strong paper piece may be hot-melted or glued. Of course, in some cases, the hot melt agent may be applied in the form of a strip.

Further, in the above embodiment, the stopper 14 for preventing the tab 15 from breaking is attached between the upper end of the knob region 11 and the upper folding rib 9, but as shown in FIG. You may make it attach so that it may depend on 9. In addition, any type of stopper may or may not be attached to the upper end of the knob region 11, and the stopper may cover the upper end of the half cut 12 or the stopper may be provided on the upper end folding rib 9. In this case, there may be no gap between the picking area 11 and the upper end folding rib 9.

In the above description, when the knob region 11 is peeled from the lower end to form the knob piece 15, the stopper piece 14 prevents the knob piece 15 from being shredded. As described above, by devising the device for stopping the progress of the tearing on the upper end of the half cut 12, the picking piece 15 can be more difficult to tear and the unsealing property can be improved. In the example shown in FIG. 11, an outward radius is provided at the upper end of the half cut 12, and in the example shown in FIG. 12, an inward radius is provided. In the case shown in FIG. 13, an arc-shaped half cut 12 that surrounds the upper end of the half cut 12.
In FIG. 14, the upper end of the half cut 12 is continuous with the small circular half cut 12b. In FIG. 15, a horizontal half cut 12c is provided inside and outside at the upper end of the half cut 12, and in the one shown in FIG. 16, a horizontal half cut 12d.
Is provided only on the outside. 11 to 16 show the state before the stopper 14 is provided.

In each of the above-mentioned embodiments, the stopper 14 is used as the break preventing means for the knob 15, but in the embodiment shown in FIG. 17, another form is adopted as the break preventing means. That is, a polyethylene reinforcement film 16 having a size sufficient to cover the portion to be the picked-up area 11 is attached to the surface, and then the half cut 12 is inserted from the surface layer side. In the case of this type of paper container 1, a pattern is printed on the packaging material, blanking is performed by punching and ruled lines, and then the reinforcing film 16 is attached to the blank to form the half cut 12, but the half cut is performed. Reference numeral 12 penetrates the reinforcing film 16 and is provided at the same depth as described above. The area to which the reinforcing film 16 is attached may be unprinted in order to enhance the adhesive effect. Then, the blank thus created is assembled to create the paper container 1. Further, the reinforcing film 16 is not limited to the above polyethylene film, but other than this, a film of any thermoplastic resin or a film in which a thermoplastic resin is laminated at least on the side to be attached (for example,
PE / PET, PE / NY / OPP, etc.) may be used. Then, these films may be attached to the surface of the packaging material by means of heat sealing, ultrasonic sealing, high frequency sealing or the like.

In the paper container provided with the reinforcing film 16, the top seal portion is peeled off and the upper folding side wall 3 is widened to the left and right, and then the picking area 11 is provided on the reinforcing film 16 thereon.
When the picking piece 15 is formed by peeling it off from the lower end together with a part thereof, the picking piece 15 is in a state in which the reinforcing film 16 overlaps the upper surface of the picking piece 15.
The breakage of 6 and the delamination of the paper layer of the packaging material are stopped, and by pulling as it is, the upper folding rib 9 of the paper container 1 is caused to form the opening.

In the case of a paper container for storing milk or juice, a packaging material (PE / paper / PE) having polyethylene layers laminated on both sides of the paper layer may be used as in the above embodiment.
Other packaging materials such as the following depending on the contents
Are used as appropriate. “PE / paper / PE / (PE / PVDC / PE)” “PE / paper / PE / adhesive / PET” “PE / paper / PE / aluminum foil / PET / PE” “PE / paper / PE / silicon or Silicon oxide [SixO
y (x = 1, 2: y = 0, 1, 2, 3) vapor deposition PET / P
"E""PE / paper / PE / K-PET / PE""PE / paper / PE / barrier layer / PET / LDPE or LLDPE" (barrier layer: EVOH, ON, K-OP,
HDPE, OPP)

In any of the packaging materials, the half-cut forming the picking area is such that if the depth is in the range from immediately before the paper layer to the innermost resin layer, the paper layer is delaminated in the picking area. However, in order to surely cause delamination, it is best to provide the depth of about 1/2 to 2/3 of the paper layer.

Further, in the type in which the stopper is used as the breakage preventing means, the half cuts for partitioning the pinching region can be discontinuously formed, for example, in a perforated shape, except for the lower part which is the part to be pinched by fingers. You can also make perforations with. However, in this case, it is needless to say that it is necessary to set the interval so that the half cuts provided discontinuously can be connected to each other to separate the paper layers.

Although the above embodiment has been described with reference to a rectangular tube-shaped paper container as an example, the present invention is not limited to a paper container having an optional trunk or bottom shape as long as it has a roof-type top closure. Applicable for containers.

[0023]

As described above, in the paper container of the present invention, the pinch piece is formed by delaminating the part of the pinch area with the paper layer, and by pulling this as it is, the inside of the top seal part Since the seal part is peeled off, the operation of raising the top can be done easily, and furthermore, a half cut is provided to partition the picking area,
Since it suffices to provide a stopper or a reinforcing film for preventing the tabs from breaking, the manufacturing is simple, and the tabs are not raised until the opening, so that they do not become an obstacle during the box making and cause no trouble.

[Brief description of drawings]

FIG. 1 is a perspective view showing a paper container as one embodiment of the present invention.

2 is a development view of a blank for assembling the paper container shown in FIG. 1. FIG.

FIG. 3 is a partially enlarged view of FIG.

FIG. 4 is a perspective view showing a state where a tab is formed.

FIG. 5 is a partially enlarged view of a blank showing another shape of the picking area.

FIG. 6 is a partially enlarged view of a blank showing another shape of the picking area.

FIG. 7 is a partially enlarged view of a blank showing another shape of the picking area.

FIG. 8 is a partially enlarged view of a blank showing another shape of the picking area.

FIG. 9 is a partially enlarged view of the blank showing another shape of the picking area.

FIG. 10 is a partially enlarged view of the blank showing another mounting position of the stopper.

FIG. 11 is a partially enlarged view of a blank showing another shape of the picking area.

FIG. 12 is a partially enlarged view of a blank showing another shape of the picking area.

FIG. 13 is a partially enlarged view of a blank showing another shape of the picking area.

FIG. 14 is a partially enlarged view of the blank showing another shape of the picking area.

FIG. 15 is a partially enlarged view of a blank showing another shape of the picking area.

FIG. 16 is a partially enlarged view of the blank showing another shape of the picking area.

FIG. 17 is a partially enlarged view of a blank showing an example in which a reinforcing film is used.

[Explanation of symbols]

 1 Paper container 3,4 Upper folding side wall c Diagonal ruled line 5,6 Upper side wall 7,8 Upper end rib 9,10 Upper end folding rib 11 Grip area 12 Half cut 14 Stopper 15 Grip piece 16 Reinforcement film

Claims (3)

[Claims] 1. The opposite upper folded side walls are folded inward along respective diagonal ruled lines, and the remaining opposite upper folded side walls are folded inwardly so that the upper end ribs sandwich the upper folded side ribs of the upper folded side walls to cause polymerization. , In a paper container having a top closure formed by heat-sealing and adhering the polymerized portion, a pinching region having a shape in which the lower part is closed and the upper part is opened is defined at approximately the center of one upper folded side wall. And a half cut is inserted from the surface layer side, and a break preventing means is provided for preventing the knob piece formed when the knob region is peeled from the lower part from breaking at the upper part. Paper container. 2. The paper container according to claim 1, wherein a stopper is provided at or near an upper end of the picking area to constitute the breakage prevention means by the stopper. 3. The breaking preventing means is constituted by the reinforcing film by attaching a half-cut from the surface layer side after attaching a reinforcing film covering the portion to be the picked area to the surface. The paper container according to claim 1.