JPH08276930A - Easily unsealable paper container for liquid - Google Patents

Abstract

PURPOSE: To provide an easily unsealable paper container for liquid which can be easily unsealed when in use only with fingers and in which there is no possibility of leakage of contents, i.e., liquid, during the distribution and storage. CONSTITUTION: Sealing notches 30 each are provided in each edge of top end sealing parts A of a left side panel 120 and right side panel 140 of a blank board 100 respectively at positions which are symmetrically provided with respect to a fold line at the center of the top end sealing part, and a cut line part 31, in which short longitudinal cut lines are parallelly arranged at fine pitches in a lateral direction, is provided at the edge of each of the notches 30. And a cut line is formed in a paper board layer 102, to which a outside film layer 101 is attached, in a U-shape symmetrical with respect to the central fold line through the sealing part A and a top part B, and thereafter a half cut line 20, which is formed by pasting an inside laminated film layer 103 to the lower part of the paper board, is passed through the cut line so that the end of the line 20 is connected to each of the notches.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid paper container used for liquid contents such as milk, seasonings, fruit juice drinks and kitchen detergents.
The present invention relates to an easy-open type liquid paper container whose top portion can be easily opened with only a finger.

[0002]

2. Description of the Related Art A blank board is manufactured by using a laminated material in which a paperboard is used as a base material, and a synthetic resin film or a metal foil is laminated on the base material. A liquid paper container of cubic or rectangular parallelepiped shape is prepared with, and the liquid paper container filled with the liquid contents has been widely used in the food field from the past, and recently is also often used in the non-food field. It has started to be done. At the time of use, to open these containers, either peel off the triangular tops that are temporarily adhered to the side walls on both sides and cut the tips of these triangular tops with scissors, or use the triangular top beforehand. A V-shaped opening notch for opening and a half-cut line connected to this notch are formed in the cutting portion of the top by post-processing in a laminated material, and when using, without using other tools such as scissors, I was able to open it with just my fingers.

[0003]

However, the method of opening using the scissors described above requires scissors of another tool at the time of use, and the V-shaped notch for opening and the half cut by the post-processing are performed in advance. In the method of forming the wire with the cut portion, the usual processing error is 0 ± 0.15 m / m, so the connection between the V-shaped notch for opening and the tip of the half cut wire is shown in FIG. As described above, the tip (f) of the notch (30) for opening and the tip (q) of the half-cut line (20) may be connected apart from each other. Since it concentrates on the tip (p) of the notch, the half-cut line may be difficult to tear. Also, FIG.
As shown in (a), when the cut depth of the half-cut line (20) reaches an appropriate position of the paperboard layer (102), the half-cut line is likely to tear at the time of opening,
Moreover, although problems such as liquid leakage do not occur during distribution or storage, as shown in FIG. 4B, the half-cut line (20)
When the half cut line (20) is shallow, there is a problem that the half cut line is not easily torn when opened, and when the half cut line (20) reaches deeply to the laminated film layer as shown in FIG. The cut lines were easily broken, and accidents such as liquid leakage of the contents sometimes occurred during distribution and storage.

The present invention solves the above-mentioned problems of the conventional liquid paper container, and at the time of use, it is easy to open with a finger without using other tools, and the liquid of the contents is distributed at the time of distribution or storage. (EN) Provided is an easily openable liquid paper container which is free from the danger of leakage.

[0005]

As shown in FIG. 1 (a), the present invention comprises an upper end seal portion (A), a top portion (B), a side wall portion (C) and a bottom portion (D) in this order. A base material is a paperboard in which a back seal panel (110), a left side panel (120), a front panel (130), a right side panel (140), and a back panel (150) are successively arranged through a fold line (10). In a cubic or rectangular parallelepiped liquid paper container having a box-shaped top made by a blank plate (100), a left side panel (12) of the blank plate (100)
0) and the right side panel (140) the upper end seal portion (A)
The two opening notches (30) are provided at the end edge portions of the two at positions symmetrical to the fold line provided at the center of the upper end seal portion (A), and these opening notches (30)
As shown in FIG. 1B, a cut line portion (31) provided with short vertical cut lines arranged in parallel in the horizontal direction is provided at the edge of the upper end seal portion (A) below In addition, as shown in FIG. 1 (c), the outer layer film layer (101) is formed in a U-shape symmetrical to the center fold line continuous with the upper end seal part (A) and the top part (B). After forming a cut line on the laminated paperboard layer (102), the paperboard layer (10
A half-cut line (20) formed by laminating an inner laminated film layer (103) below 2) is made to pass through the cut line portion (31), and the two cutouts (3) for opening.
0) is an easily openable liquid paper container (1) shown in FIG. 2 (a) having a tip connected to it.

The above-mentioned blank board has a paperboard layer as a base material, and an outer layer film made of, for example, polyethylene is attached to the base material by various laminating methods, and the inside of the blank board is made of, for example, a polyethylene layer and an aluminum foil. And an inner laminated film obtained by laminating a layer, a polyethylene terephthalate layer, and the like.

The length of the short vertical cut lines forming the cut line portion is usually about 0.5 to 1.5 m / m, and the pitch of the cut lines arranged in parallel is 0.4 to 1.3 m. The width of the cut line is about 2 to 4 m / m in consideration of printing error and processing error.

[0008]

In the easily openable liquid paper container of the present invention, a cut line portion in which cut lines are juxtaposed in a lateral direction at a fine pitch is provided at the edge portion of the upper end seal portion below the opening notch, and , Since the half-cut line is connected to the opening notch by passing through this cutting line part, when tearing force is applied to the opening notch with fingers of the hand when opening, the cutting line parallel to the cutting line part Of these, the cut line closest to the half-cut line is deformed and easily opens, so the tearing force concentrates,
This concentrated tearing force cuts the half-cut line. As a result, the positional error between the opening notch and the half-cut line during processing is absorbed.

The half-cut line is formed by forming the cut line on the paperboard layer to which the outer film layer is attached and then attaching the inner laminated film layer below the paperboard layer. The tear strength is stable and stable.

[0010]

Example First, on the upper side of a paperboard having a basis weight of 280 g / m ² ,
A 25 μm thick polyethylene layer is formed by extrusion laminating method, characters and patterns are printed on this polyethylene layer, and U-shaped cut lines are formed at the top seal portion and the top portion of the left side panel and the right side panel. Then, a laminated film of 7 μm thick aluminum foil layer / 12 μm thick polyethylene terephthalate layer / 60 μm thick polyethylene layer constitution is formed on the lower side of the paperboard by extrusion laminating process to 25 μm.
A polyethylene material having a thickness of m was attached to each other to prepare a laminated material having a half-cut line (20) shown in FIG. 1 (c). Next, this laminated material is punched to obtain the structure shown in FIG.
As shown in FIG. 5, a back seal panel (110), a left side panel (120), and a front panel (130), each of which includes an upper end seal portion (A), a top portion (B), a side wall portion (C), and a bottom portion (D), respectively. ), The right side panel (140), and the back panel (150) are sequentially connected through the fold line (10),
Two U-shaped opening notches (30) for opening and closing (30 at the left and right side panels and at the edge portions of the upper end seal portion at positions symmetrical to the fold line provided at the center of the upper end seal portion, respectively) ) Is provided, and as shown in FIG. 1 (b), a vertical length of 1 m / m is provided at the edge of the upper end seal portion below these opening notches.
A cut line part (31) with a width of 3 m / m in which cut lines with a length of m are arranged side by side in a lateral direction at a fine pitch of 0.5 m / m is provided, and a central part continuous with the top seal part and the top part is provided. The tip of the U-shaped half-cut line (20) that is symmetrical to the fold line,
A blank plate (100) of the easily openable liquid paper container of the present invention, which passed through the cut line portion and was connected to the notch for opening, was produced. Next, this blank plate is box-filled with a filling machine, the contents are filled and sealed, and the top is flat and the rectangular parallelepiped is shown in FIG.
The easily openable liquid paper container (1) of the present invention shown in (1) was produced.

Next, about 10 cases of the prepared easy-open liquid paper container of the present invention were subjected to normal distribution and storage processes, and the liquid leakage state of the contents was examined. There was nothing. Next, as shown in FIG. 2B, the triangular tops (B) temporarily adhered to the left and right side wall parts (C) are peeled off, and the upper end seal portions of these triangular tops (B) are peeled off. Opening notch (3) formed in (A)
0) is torn with a finger, the half-cut line (20) continuous with the notch for opening easily cuts, and as shown in FIG. 2 (c), the tips of the triangular tops on both sides are separated from the container. It was cut off, an opening (G) was formed, and the container was opened.

[0012]

EFFECTS OF THE INVENTION In the easily openable liquid paper container of the present invention, a cut line portion, in which cut lines are arranged in a row at a fine pitch in the lateral direction, is provided in the upper end seal portion below the opening notch, and the cut line portion is formed. Since the half-cut line passes through and is connected to the opening notch, the user can easily tear the half-cut line from the opening notch with a finger to open the container during use.

Further, since the cut line is formed on the paperboard layer to which the outer layer film layer is attached, the inner laminated film layer is attached below the paperboard layer to form the half cut line. The tear strength is even and stable, and there is very little concern that the half-cut wire will crack during distribution or storage and the contents will leak.

[Brief description of drawings]

FIG. 1A is a developed plan view of a blank of an easily openable liquid paper container according to an embodiment of the present invention, and FIG.
It is an enlarged plan view of E part of the blank, (c) is,
It is an expanded sectional view of the F section in the direction at right angles to the half cut line.

FIG. 2 (a) is a perspective view of an easily openable liquid paper container of the embodiment, and FIG. 2 (b) is an explanatory view showing a state in which both ends of the top part are peeled off from the side wall part for opening. c) is an explanatory view showing a state in which both ends of the top portion are separated.

FIG. 3 is an enlarged plan view of an E portion of a blank of an example of a conventional easy-open liquid paper container.

FIG. 4 is an enlarged cross-sectional view of an F portion of a blank of an example of a conventional easy-open type liquid paper container in a direction perpendicular to a half-cut line, (a) shows a state where the half-cut has an appropriate depth, (B) shows a shallow state, (c) shows a deep state.

[Explanation of symbols]

 1-Easy opening type liquid paper container 10-Fold line 20-Half cut line 30-Open cutout 31-Cut line 100-Blank plate 101-Outer film layer 102-Paperboard layer 103 ... … Inside laminated film layer 110 …… Back seal panel 120 …… Left side panel 130 …… Front panel 140 …… Right side panel 150 …… Back panel A …… Top seal B …… Top C …… Side wall D …… … Bottom G …… Opening p, q …… Tip

Claims (1)

[Claims] 1. A back seal panel comprising a top seal portion, a top portion, a side wall portion and a bottom portion, a left side panel, respectively.
In the liquid paper container of which the top is flat and has a cubic or rectangular parallelepiped shape, the box is made of a blank board whose base material is a paperboard in which a front panel, a right side panel, and a back panel are sequentially connected via fold lines. In the left edge panel and the right side panel of the upper end seal portion of the edge portion, two opening notches are provided at positions symmetrical to the fold line provided at the center of the upper end seal portion. At the edge of the upper end seal below the notch for opening, a cut line is provided in which short vertical cut lines are arranged in parallel in the horizontal direction at a fine pitch, and the upper end seal and the top are continuous. A half-cut formed by forming a cut line in a paperboard layer, which is a U-shape symmetrical to the center crease line and which is laminated with an outer layer film layer, and is then laminated with an inner laminated film layer below the paperboard layer. The line Easy-open type liquid paper container Tsu passed through the door line unit, characterized in that to connect the tip to-out the two notches for unsealed.