JPH09301355A - Easy to open liquid paper container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart an easily openability to a paper board on both surfaces of which are coated with a thermoplastic resin by a method wherein a half cut is placed from the surface layer part so that a pull tab region of a specific shape may be partitioned extending from a top folded in side wall on the unsealing side, to the top of a body part side wall panel, and an embossing process is applied in the pull tab region. SOLUTION: For a carton blank, a thermoplastic resin layer 6 is provided on both surfaces of a paper board layer 7 which is an intermediate layer, or a laminated body with the paper board layer as the center, and a half cut H is placed from the surface layer to approx. one half depth of the blank. Also, as a slip preventive means, a folding line process by a creaser is performed for a pull tab P at the same time as a punching of the carton blank 10, and at the same time, at an upper area from the location entering the inside at least by 4-5mm from the lowermost end of a pull tab region, an embossing process is performed by a plurality of ruled lines E, and an unevenness is formed on the pull tab P. By those processes, the frictional resistance of the pull tab P becomes larger, and a slip preventive property can be imparted, and the unsealing becomes easier.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a Gobel-top type liquid paper container such as milk and fruit juice drink which is provided with an easy-open property.

[0002]

2. Description of the Related Art To open a Gobel top carton (gable roof carton) which has been established as a liquid paper container for milk, fruit juice drink, dairy drink, mineral water, etc.
As shown in FIG. 2, it is necessary to first peel off one side of the top seal part by the upper end rib and spread it to the left and right, and then push the spread part from both sides to peel off the inner seal part and cause it. The strong sealing strength makes the opening operation difficult. Therefore, in order to facilitate the unsealing operation, a carton with an anti-heat-sealant layer is provided between the opposing upper ribs to weaken the peel strength, and a knob member for pulling out the upper folded side wall forming the spout to the outside (below It has been proposed to attach a pull tab).

[0003]

However, when the anti-heat-sealing agent layer is provided on the inner surface of the ribs at the upper end, it takes time and effort to partially coat the ribs on the inner surface of the carton with the anti-heat-sealing agent. There is a problem that not only the sealing agent itself is required and the cost thereof is increased, but also liquid leakage may occur if the coating is not accurately applied at a predetermined position. The pull tab disclosed in Japanese Utility Model Laid-Open No. Sho 63-128931 has a problem that it is troublesome to operate because it is necessary to attach a part of the pull tab to the upper folding side wall, and it is disclosed in Japanese Utility Model Laid-Open No. 2-66423. The type has the problem that the pull tab interferes with the box making. Further, the type shown in Japanese Patent Laid-Open No. 7-315375 has a problem that the tip of the pull tab is hard to raise. Furthermore, if the pull tab is picked up with a finger and pulled toward you, there is a problem that the finger slips and the force is not applied because the pull tab surface is smooth. Nowadays, in order to reduce the liquid leakage at the distribution stage of the liquid carton according to the demand of the retail industry, the pressure at the time of heat-sealing in the molding and filling machine tends to be high, and the liquid carton thus molded is endowed. It is becoming difficult for users to open. On the other hand, there is an ever-increasing demand for liquid paper containers that are easily opened by end users. The industry has such a trade-off. The present invention has been made in view of such a problem, and provides a liquid paper container having an easy-open property by merely physically processing a double-sided thermoplastic resin-coated paperboard used for a Gobel top carton. With the goal.

[0004]

The easily openable liquid paper container of the present invention, which has been made to solve the above-mentioned problems, has a quadrangular column-shaped body composed of four side wall panels, and a folding line is provided at the upper end of the body. The gable roof part connected to each other folds the upper folded side walls facing each other inward along the diagonal fold lines, and at the same time, folds the remaining facing upper side walls inward and at the same time, folds the upper folded side walls to the upper end. In a paper container formed by heat-sealing the polymerized portion by sandwiching the ribs, the upper folded side wall on the unsealing side and the upper side of the body side wall panel that are connected to each other through a fold line, and the lower part is It is configured such that half-cutting is performed from the surface layer portion so as to partition the pull tab region having a shape in which the closed upper portion is open, and embossing is performed in the pull tab region.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a development view of a carton blank of an easily openable liquid paper container according to the present invention. The carton blank 10 is composed of a paperboard having thermoplastic resin layers on both sides or a laminated body mainly composed of the paperboard. As shown in FIG.
First, in the body part D, the side wall panels 1 to 4 and the glue allowance 5 are connected to each other through the fold lines a to d, and the upper side walls 2G and 3G, that is, the roof part and the gable roof (both ends of the gable roof) which form a gable roof are formed on the upper part thereof. Upper fold side wall 1G corresponding to the mountain-shaped wall portion of
4G is connected via a folding line h, and folding ribs 1T and 4T and ribs 2T and 3T that wrap the folding ribs 1T and seal the palms are extended via a folding line j. The upper folding side walls 1G and 4G have folding lines e,
g, and folding lines i for folding the folding ribs 1T and 4T are provided at the centers thereof. A pull tab P is used as a means for easily opening the opening side of the easily openable liquid paper container according to the present invention. The pull tab P is formed by inserting a half cut H from the surface layer portion so as to define a pull tab region having a shape in which a lower part is closed and an upper part is opened. This half-cut H can be put in the final unit of roll-up printing by a gravure multi-color rotary press, and when sheet-fed printing by offset is adopted, it can be performed at the same time as punching of the carton. An adhesive tape S is attached to the open end of the pull tab area so that delamination of the pull tab area stops at the upper part of the upper folded side wall 1G. This attachment is performed in a separate step after blanking the blank. The bottom molding portion B is composed of respective portions which are connected to the lower side of the body molding portion D via a fold line i, and these are heat-sealed to form a flat bottom portion without liquid leakage.

In order to form the easily openable liquid paper container according to the present invention from the blank 10 described above, first, the blank is vertically folded in three lines along the folding line a and the folding line c, and the glue allowance panel 5, the body portion 4, and the upper folding side wall. 4G, a predetermined portion of the rib 4T are heat-sealed and attached to a tube to form a flat folding carton. This is supplied to a molding and filling machine and raised in a prismatic shape,
First, the bottom is molded, the contents are filled, then the gable roof is molded, and finally the top rib is sealed by heat sealing. In this top rib heat seal, first, when the upper folded side walls 1G, 4G are folded inward by the diagonal folding lines e, g and the folding line h, the upper ribs 1T, 4T are bent at the central folding line k. When folded in two, the remaining ribs 2T and 3T also fall inward at the same time, and the double folded ribs 1T and 4T are sandwiched between them to form a joint seal and the top seal is completed. The easily openable liquid paper container 20 according to the present invention as shown in FIG. In this case, the four ribs to be polymerized are firmly heat-sealed by the thermoplastic resin layer.

FIG. 2 shows an easily openable liquid paper container 2 according to the present invention.
It is explanatory drawing of the opening of 0. In the general opening operation up to now, the opening side of the liquid paper container as shown in FIG. 2 (a) is confirmed by a print display, and the upper side walls (roof part) 2G and 3G overlapping the upper side folded side wall 1G on the opening side. Open the left and right strongly with both hands and peel off the ribs 1 to 4T that are quadruple heat-sealed from the middle, and remove the ribs as shown in FIG. 2 (b).
Character shape. If you pull it toward you while pressing the left and right sides with your fingers as shown by the arrows, the five fold lines in the center of the rib 1T will intersect.
Peeling starts from a point, and the peeling spreads to the left and right and upward, and finally the spout M can be opened as shown in FIG. However, it is difficult to open the semi-opened state of FIG. 2B to the final opened state of FIG. 2C, and the present invention solves this problem. The opening operation will be described below.

First, in the state of FIG. 2 (a) before opening,
Although it is necessary to confirm the unsealed side, it may be performed by visually observing the print indication as described above, but the pull tab P is slightly protruded from the upper end of the body side wall panel 1 and is confirmed by touching it. You can go. Next, in order to pull the upper folded side wall 1G away from the half-opened state as shown in FIG. 2B, first pull up the tip of the pull tab P, pick the tip with a fingertip, and follow the half cut H to the pull tab P area. Peeling off the entire pull tab P while causing interlayer peeling, this time firmly pulling the pulled tab P with fingers and pulling it toward you, peeling of the ribs from point K propagates to the entire top seal portion and opens. The spout M can be opened as shown in FIG. 2 (c). The use of the pull tab P formed by half-cutting by diverting such a blank laminated material is used not only for opening the Gobel top carton but also for opening the straw hole in the old days. However, in any case, the surface of the pull tab P is smooth and slips unless it is firmly pinched by fingers, and there are cases where the elderly or persons with weak strength cannot open the pull tab P. The easily openable liquid paper container 20 according to the present invention is one in which the pull tab P is embossed as a slip preventing means in order to solve this point, and its processing will be described below.

FIG. 3 is an explanatory diagram of embossing of the pull tab P. 3 (a) is an enlarged plan view of the upper folded side wall 1G provided with the pull tab P, FIG. 3 (b) is a schematic sectional view taken along the line AA of FIG. 3 (a) after the carton is molded, and FIG.
(C) is a schematic sectional view showing a situation where the pull tab P is peeled off. As shown in FIG. 3 (a), the carton blank 10 is punched and crease-processed at the same time, and at the same time, in the pull tab region, the carton blank 10 is at least 4 to 5 mm inward from the lowermost end, and is then moved upward. Embossing is performed by a plurality of ruled lines E to form irregularities. Since the shape is generally stamped from the surface layer portion, the surface layer portion becomes a concave portion and a convex portion is formed on the back surface as shown in FIG. 3B. Good. The carton blank 10 is shown in FIG.
As shown in (b), a thermoplastic resin layer 6 is provided on both surfaces of the intermediate paperboard layer 7 or the laminate centered around the paperboard layer, and the half-cut H extends from the surface layer to almost half the depth of the blank. It is included. When the pull tab P area in this state is peeled off from the tip end according to the half cut H, the pull tab P causes the interlayer separation of the paperboard as shown in FIG. The pull tab P is peeled off with a thickness equal to, and an unevenness due to the ruled line E is formed in the center of the pull tab P. FIG.
FIG. 6 is an explanatory diagram of an emboss pattern. The embossed pattern by the ruled line E in FIG. 3A is the simplest case, but the patterns usable in the present invention are shown in FIGS. 4A to 4D.
Any of those shown in may be used. Further, as shown in FIGS. 4 (e) and 4 (f), an embossing plate whose surface is processed into a diamond-cut shape, a satin-finished shape, or the like may be pressed, and the roughness thereof is also arbitrary. By the above processing, the frictional resistance of the surface of the pull-tab P, especially of the surface of the thermoplastic resin, is increased, and slip resistance can be imparted. However, a portion close to the tip of the pull tab P should be prevented from being pressed against a ruled line or an embossed plate. This is to prevent the tip of the pull tab P from being already raised by the embossing when the blank is processed. The depth of the half cut H is 0.45 to 0.
In the case of 46 mm, it is desirable to keep the range of 0.15 to 0.25 mm. This is because if it exceeds 0.3 mm, pinholes are likely to be formed, which easily causes liquid leakage.

FIG. 5 is an explanatory view of the plan shape of the pull tab P and the stopper S. The planar shape of the pull tab P used in the present invention is arbitrary as shown in FIG.
As shown in (c) and (d), the half cut H on the open side
May be rounded or rounded to stop the delamination of the paperboard beyond a predetermined level. The half cut H may be perforated except for the tip of the pull tab P. However, the half cuts provided discontinuously should be designed so as to be connected when the pull tab P is peeled off. Further, as a means to replace the stopper S with the adhesive tape, a reinforcing film may be attached so as to cover the entire surface of the pull tab P, and then the half cut H may be inserted from the surface layer to stop the delamination with the reinforcing film. .

For the laminated constitution of the base material of the liquid paper container of the present invention, a conventionally used paperboard layer coated on both sides with a polyolefin resin is preferably used, and as the polyolefin resin, low density polyethylene, wire Low density polyethylene, medium density polyethylene, polypropylene, ionomer, ethylene vinyl acetate copolymer, ethylene
Acrylic acid copolymer, ethylene / acrylic acid ester,
It may be selected from ethylene / vinyl alcohol copolymers and the like. Further, instead of the paperboard alone, the following laminated body can be used as appropriate. However, it is premised that there is a paper layer in the intermediate layer and the depth of the half cut H is such that it stays between the paper layers. (1) PE / paper / PE (PE / PVDC / PE) (2) PE / paper / PE / adhesive / PET (3) PE / paper / PE / aluminum foil / PET / PE (4) PE / paper / PE / silicon or silicon oxide [Six
Oy (x = 1, 2: y = 0, 1, 2, 3)] Evaporated PET
/ PE (5) PE / paper / PE / K-PET / PE (6) PE / paper / PE / barrier layer / PET / LDPE or LLDPE (barrier: EVOH, ON, K-OP, H
DPE, OPP)

[0012]

EXAMPLE A liquid paper container according to the present invention was applied to milk to prepare a carton blank having an internal volume of 1000 ml. As the carton base material, the one having the following laminated structure manufactured by Weyerhaeuser Co., which is currently used for milk, was used as it was. That is, polyethylene 16 g /
m ² / bleached kraft paper 313 g / m ² / polyethylene 27
It has a layer structure of g / m ² and the total basis weight is 356.
g / m ² and the total thickness is 0.45 to 0.50 mm. A half cut H as shown in FIG. 3 (a) was inserted from the surface layer through the thermoplastic resin layer between the upper folded side wall 1G and the body side wall panel 1 of the carton blank made of this laminated material. A ruled line E as shown in FIG. 3A was added to the pull tab region at the same time as the punching process. When the above carton blank was pasted in a conventional process with a tube, molded, filled, and subjected to an opening test using a pull tab P, the force of pinching a fingertip was smaller than that of the conventional one, and it was easy to open.

The easily openable liquid paper container according to the present invention is not limited to the above-described embodiment of the invention, and various modifications can be made without departing from the scope of the present invention. For example, the blank of the Gobel top carton of this embodiment is drawn in a pure pack type, but it is also effective for other types of Gobel top carton. The horizontal cross section of the body of the easily-openable liquid paper container according to the present invention is square, but it may be rectangular. Also, although it is a liquid paper container, it does not matter what the contents are.

[0014]

EFFECTS OF THE INVENTION According to the present invention, the double tab thermoplastic resin-coated paperboard which is the base material of the Goebel top carton or the fold line of the blank of the laminate centered around the paperboard, the pull tab P is provided with the slip preventive property at the punching step. As a result, it is possible to provide a liquid paper container that can be easily opened.
It is particularly effective for children, the elderly, handicapped persons, and business clerks who need to open the work in a short time. Further, the base material, which is obtained by coating the board with the double-sided polyolefin resin, can be incinerated and discarded as burning dust even after use, and can be recycled, so that the environmental load can be reduced.

[Brief description of drawings]

[Figure 1] Carton blank development view

[Fig. 2] Illustration of opening

FIG. 3 is an explanatory view of pull tab embossing.

FIG. 4 is an explanatory diagram of an emboss pattern.

FIG. 5 is an explanatory view of a planar shape of a pull tab P and a stopper S.

[Explanation of symbols]

 1-4 Body part side wall panel 5 Adhesive allowance for tube sticking 1G, 4G Upper folding side wall (gable part) 2G, 3G Upper side wall (roof part) 1-4T Rib ak fold line 10 Blank 20 Easy to open liquid according to the present invention Paper container B Bottom forming part D Body forming part E Embossing H Half cut K Peeling starting point M Spouting point P Pull tab S Stopper

Claims (1)

[Claims] 1. A gable roof part connected to the upper end of a quadrangular prism-shaped body part composed of four body part side wall panels via a fold line, and an upper folded side wall facing each other is inward along each diagonal fold line. At the same time, the remaining opposite upper side walls are bent inward, and the upper end ribs of the upper side wall of the upper folding side wall sandwich the upper side folding ribs for polymerization, and the polymerized portion is heat-sealed to form a paper container. A half cut is inserted from the surface layer portion so as to define a pull tab region having a shape in which the lower portion is closed and the upper portion is opened, across the upper folding side wall on the opening side and the upper portion of the body side wall panel which are connected via An easily-openable liquid paper container characterized by being embossed in the pull tab area.