JP2022107045A - Paper container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a paper container capable of easily opening by recessing an upper end part of a barrel portion panel when opening, and having no possibility of occurrence of distortion in its form when forming the paper container.

SOLUTION: Reference points 40 are set at a barrel portion panel 7 on an opening side continuously provided on a gable wall forming panel 23 on the opening side via a top transverse folding line 25. A downward arc-like first auxiliary folding line 43 on which end parts 41, 42 are arranged is formed so as to connect the reference points 40 with each other or connect positions, near the reference points 40 and on barrel portion longitudinal folding lines 3, 4 or being the positions separate from the barrel portion longitudinal folding lines 3, 4 and equal to or lower than the reference points 40 in a height direction, with each other. The end parts 41, 42 of the first auxiliary folding line 43 connecting the positions, near the reference points 40 and on the barrel portion longitudinal folding lines 3, 4 or being the positions separate from the barrel portion longitudinal folding lines 3, 4 and equal to or lower than the reference points 40 in a height direction, with each other are separated from an intersection point 39 by 3 mm or more and in a range of a length of 20% or less of the top transverse folding line 25.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a paper container for accommodating liquid contents.

Conventionally, as a paper container for storing liquid contents such as milk and juice, it is made of a paperboard material in which thermoplastic resin is laminated on the front and back surfaces, has four body panels, and the edges are joined by a vertical seal panel. A square tubular body is formed, with a pair of gable roof forming panels facing each other with an outer top seal panel at the top and an inner top seal panel at the top facing each other at the top of the body panel. A pair of end wall forming panels, one of which serves as a spout and is opened, are connected in series, and a pair of end wall forming panels are folded between the pair of gable roof forming panels to form an outer top seal panel and an inner top seal panel. A gabled roof type paper container is widely used in which a top is formed by being heated in a predetermined position, sealed and sealed.

To open such a gable roof type paper container, put your finger in the space that opens between the pair of gable roof forming panels, the body panel, and the gable wall forming panel, and put your finger on the gable wall forming panel. By spreading from side to side, the heat-sealed facing surfaces of the outer top seal panel and the inner top seal panel on the opening side are peeled off, and the gable roof forming panel is folded between the pair of gable roof forming panels. The panel is pulled out and folded outward from the top cross-fold line at the boundary with the body panel which is continuously connected via the top cross-fold line to open the spout. However, if the user's hands are large, the paper container is small, or the height of the top of the gable roof type is lowered for the purpose of space saving, between the body panel and the end wall forming panel. Since the space formed in the roof is narrow, it is difficult to put a finger on the gable wall forming panel, and there is a problem that the opening work cannot be easily performed.

As a paper container that solves such a problem, in recent years, in a body panel that is connected to a gable wall forming panel and a gable wall forming panel that is pulled out when the paper container is opened, a top horizontal folding line located at a boundary with the gable wall forming panel. A gable-roofed paper container is known in the vicinity of which is provided with an auxiliary fold line that descends from one end of the top horizontal fold line toward the other end toward the center of the body panel (eg, patent). See Document 1.).

According to the gable roof type paper container provided with such an auxiliary fold line, when the top corner of the body formed by the top horizontal fold line is pushed inside the container, the top corner is folded from the auxiliary fold line. Curves inward of the container, and the upper part sandwiched between the top horizontal fold line of the body panel and the opening auxiliary ruled line dents inside the container. As a result, the space for inserting the finger when the finger is put on the wife wall forming panel at the time of opening is widened, so that the paper container can be easily opened.

JP-A-2002-234524

However, in a paper container as described in Patent Document 1, since the end of the auxiliary fold line is connected to the end of the top horizontal fold line, when forming the gable roof type top of the paper container, the top horizontal fold line is folded into a mountain fold. When pressure is applied to the auxiliary fold line, the force is transmitted to the auxiliary fold line, and there is a problem that a defective product having a distorted shape may be generated due to a mountain fold from the auxiliary fold line.

In view of the above problems, the present inventor has repeatedly studied the position and shape of the auxiliary folding line that dents the body panel when forming the spout formed in the body, and has completed the present invention.

An object of the present invention is to ensure that the upper end of the body panel is recessed when opening the paper container so that the paper container can be easily opened and that the shape is distorted when the paper container is formed. The purpose is to provide a paper container that is free from the risk of

In order to achieve the above object, the invention according to claim 1 is
It is made of a paperboard material with a thermoplastic resin laminated on the back surface, has four body panels, and the edges are joined by a vertical seal panel to form a square cylindrical body, and the upper end of the body panel is formed. A pair of gable roof forming panels having an outer top seal panel on the upper part and facing each other, and a pair of gable wall forming panels having an inner top seal panel on the upper part and facing each other, one of which serves as a spout and is opened. By being connected in series, the pair of gabled wall forming panels are folded between the pair of gabled roof forming panels, and the outer top seal panel and the inner top seal panel are heated in a predetermined position to be sealed and sealed. In a gabled roof type paper container in which a top is formed, a body panel on the opening side, which is connected to the wall forming panel on the opening side via a cross-fold line at the top, is provided on both sides of the body panel on the opening side. A reference point is set on the body vertical fold line at a distance of 3 mm or more from the intersection of the end of the body vertical fold line and the end of the top horizontal fold line, and the reference points are set at or near the reference point. A downward arc-shaped first auxiliary fold line is formed in which the ends are arranged so as to connect the positions on the body vertical fold line or away from the body vertical fold line and below the reference point in the height direction. The end of the first auxiliary fold line that connects the positions near the reference point, on the body vertical fold line, or away from the body vertical fold line, and below the reference point in the height direction. Are separated from each other within a length of 3 mm or more from the intersection and 20% or less of the length of the top cross-fold line, and the body panel on the opening side and the end wall formation on the opening side are formed. On the substantially triangular surface portion provided on the panel, a second auxiliary fold line formed of a straight line extending from the lowest point direction of the central portion of the first auxiliary fold line to the apex direction of the substantially triangular surface portion across the top horizontal fold line is formed. In the second auxiliary fold line, the lower end portion of the first auxiliary fold line on the lowest point direction side is located at the lowest point of the first auxiliary fold line or in the vicinity of the lowest point. The upper end of the substantially triangular surface portion on the apex side is located at the apex of the substantially triangular surface portion or in the vicinity of the apex.

According to the invention of claim 1, the body panel on the opening side, which is continuously provided to the end wall forming panel on the opening side via the top horizontal folding line, has the body portions on both sides of the body panel on the opening side. A reference point is set on the vertical fold line at a distance of 3 mm or more from the intersection of the end of the body vertical fold line and the end of the top horizontal fold line, and the reference points are set at or near the reference point. A downward arc-shaped first auxiliary fold line is formed in which the ends are arranged so as to connect the positions on the body vertical fold line or away from the body vertical fold line and below the reference point in the height direction. The end of the first auxiliary fold line connecting the positions near the reference point, on the body vertical fold line or away from the body vertical fold line, and below the reference point in the height direction is Since they are separated from each other within a length of 3 mm or more from the intersection and 20% or less of the length of the top horizontal folding line, when forming the gable roof type top of the paper container, the mountain is formed from the top horizontal folding line. When a folding pressure is applied, it is possible to prevent the bending load receiving portion between the top horizontal folding line and the end side of the first auxiliary folding line in the body panel from buckling with a small force. On the other hand, it is possible to prevent a situation in which a strong force that is difficult to buckle is required.
As a result, when forming the gable roof type top of the paper container, when a mountain fold pressure is applied from the top horizontal fold line, the end of the top horizontal fold line and the first auxiliary fold line in the body panel. Since the bending load receiving portion between the sides does not buckle with a small force, it is possible to effectively prevent a situation in which a defective product having a distorted shape is generated due to a mountain fold from the first auxiliary folding line. Can be done.
Further, when the paper container is opened, the bending load receiving portion between the top horizontal folding line and the end side of the first auxiliary folding line in the body panel is buckled without requiring a large force, so that the cylinder The top corners of the body can be easily pushed in so that the body panel is mountain-folded from the first auxiliary fold and the ends of the top lateral fold and the first auxiliary fold in the body panel. The upper end portion of the body panel can be recessed by causing buckling in the bending load receiving portion between the sides. Then, the upper end of the body panel is recessed, so that the corner of the top is curved inward of the container, and the space for inserting a finger when putting a finger on the end wall forming panel at the time of opening is widened, so that the paper container can be opened. It can be done easily.
Further, a state in which the deformed portion becomes a damper and the upper end portion of the body panel is recessed due to buckling of the bending load receiving portion between the top horizontal fold line and the end side of the first auxiliary fold line in the body panel. Can be maintained, so that the opening of the paper container can be facilitated.

Further, since the first auxiliary folding line has an arc shape, when the top corner or the vicinity of the top corner of the tubular body formed by bending the top horizontal folding line is pushed in when opening the paper container. In addition, the body panel can be easily mountain-folded from the first auxiliary folding line, and the upper end portion of the body panel can be easily recessed.

Further, in the second auxiliary fold line composed of a straight line, the lower end portion of the first auxiliary fold line on the lowest point direction side is located at the lowest point of the first auxiliary fold line or in the vicinity of the lowest point. Since the upper end of the substantially triangular surface portion on the apex side is located at the apex of the substantially triangular surface portion or in the vicinity of the apex, when the apex corner portion of the tubular body portion is pushed in, the substantially triangular surface portion is said to be the same. The valley fold from the second auxiliary fold line becomes easier. As a result, the central portion of the top corner portion of the tubular body portion is more effectively guided to bend inside the paper container, and the substantially triangular surface portion and the upper end portion of the body portion panel can be more easily provided. Can be dented.

According to the second aspect of the present invention, the upper side of the inner top seal panel, which is connected to the upper part of the end wall forming panel on the side to be opened as a spout, is linear. It is characterized by being.

According to the invention of claim 2, since the upper side of the inner top seal panel connected to the upper part of the gable wall forming panel on the side to be opened as a spout is linear, the inner side is formed. The sealing area between the top seal panel and the outer top seal panel connected to the upper part of the pair of gable roof forming panels located on both sides of the inner top seal panel is small, and the inner top seal panel and the outer side are small. The top seal panel can be easily peeled off, and the paper container can be easily opened.

The invention according to claim 3 is the invention according to claim 1 or 2, in the lateral length direction on the inner surface of the inner top seal panel connected to the upper part of the gable wall forming panel on the side that serves as a spout and is opened. A first easily peelable area is provided at both ends of the gable roof, leaving an end seal area having a predetermined width, and the inner surface of the outer top seal panel connected to the upper part of the pair of gable roof forming panels located on both sides thereof. A second easily peeling region that overlaps with the first easily peeling region is provided in a portion closer to the inner top seal panel in approximately half of the horizontal length direction, leaving an end seal region having a predetermined width closer to the inner top seal panel. The first easily peeling region and the second easily peeling region are directed from above to below at both ends of the first easily peeling region and at the end near the inner top seal panel in the second easily peeling region. It is characterized in that each of the extension portions is inclined so that the body panel side becomes longer.

According to the third aspect of the present invention, a first easily peelable region is provided on the inner surface of the inner top seal panel which is continuously provided on the upper part of the gable wall forming panel on the side which becomes the spout and is opened. Approximately half of the inner surface of the outer top seal panel connected to the upper part of the pair of gable roof forming panels located on both sides in the lateral length direction, in the portion closer to the inner top seal panel, in the first easily peelable region. Since the overlapping second easy peeling region is provided, the inner top seal panel and the outer top seal panel can be easily peeled off, and the paper container can be easily opened.
Further, since both ends of the first easily peelable region and the end near the inner top seal panel in the second easily peelable region have extension portions that are inclined so that the body panel side becomes longer from the upper side to the lower side. The inclination direction of the upper side of the extension portion of the first easily peelable region and the second easily peelable region is the end seal region where the inner top seal panel and the outer top seal panel are present when the end wall forming panel is pulled out. Since it follows the peeling direction, the end seal area of the inner top seal panel and the outer top seal panel can be easily peeled off, and the paper container can be easily opened.

The invention according to claim 4 is the reference point according to any one of claims 1 to 3, which is separated from the intersection by 3 to 4 mm in the vertical direction, and is an end portion of the first auxiliary folding line. Is characterized by being separated from the intersection by 5 to 6 mm.

According to the invention of claim 4, the reference point is separated from the intersection by 3 to 4 mm in the vertical direction, and the end of the first auxiliary folding line is separated from the intersection by 5 to 6 mm. Therefore, the bending load receiving portion between the top horizontal fold line and the end side of the first auxiliary fold line in the body panel does not buckle with a small force, and when forming the gable roof type top of the paper container, the top When pressure is applied to make a mountain fold from the horizontal fold line, the force is transmitted to the first auxiliary fold line, and it is more effective that a defective product with a distorted shape is generated due to the mountain fold from the first auxiliary fold line. In addition, the paper container can be easily opened by buckling without requiring a large force when opening the paper container.

As described above, according to the paper container according to the present invention, the upper end of the body panel is surely recessed at the time of opening, the paper container can be easily opened, and the shape is formed when the paper container is formed. It is possible to obtain a paper container that is not likely to be distorted.

It is a top view which shows the carton blanks of the 1st example of the Embodiment of the paper container which concerns on this invention. It is explanatory drawing which shows another example of the shape of the 2nd auxiliary folding line shown in FIG. It is a side enlarged explanatory view which shows the state which the 1st auxiliary folding line and the 2nd auxiliary folding line of the paper container formed from the carton blanks shown in FIG. 1 are bent. It is a perspective view of the paper container shown in FIG. It is a top view which shows the carton blanks of the 2nd example of the embodiment of the paper container which concerns on this invention. It is explanatory drawing which shows another example of the shape of the 2nd auxiliary folding line shown in FIG. FIG. 5 is an enlarged side view showing a state in which the first auxiliary fold line and the second auxiliary fold line of the paper container formed from the carton blanks shown in FIG. 5 are bent. It is a perspective view of the paper container shown in FIG. 7.

Hereinafter, a mode for carrying out the paper container according to the present invention will be described in detail with reference to the drawings.
1 to 4 show a first example of an embodiment of a paper container according to the present invention, FIG. 1 is a plan view showing a carton blank of the first example, and FIG. 2 is a second auxiliary shown in FIG. An explanatory view showing another example of the shape of the fold line, FIG. 3 is an enlarged side view showing a state in which the first auxiliary fold line and the second auxiliary fold line of the paper container formed from the carton blanks shown in FIG. 1 are bent, and FIG. 4 is a view. It is a perspective view of the paper container shown in 3.

The paper container of the first example is formed of carton blanks 1 which is a paperboard material in which a thermoplastic resin is laminated on the front and back surfaces shown in FIG. The carton blanks 1 includes four body panels 5, 6, 7, 8 which are connected through the body vertical folding lines 2, 3, 4. At the time of forming the paper container, the four body panels 5, 6, 7, and 8 are connected to the body panel 8 via the body vertical folding line 9, and the edges of the body panel 5 and the vertical seal panel 10 are connected to each other. The portions 11 are joined to form a square tubular body portion 12 of a paper container.

At the upper ends of the body panels 6 and 8, a pair of gable roof forming panels 15 and 16 having outer top seal panels 13 and 14 at the upper part and facing each other are continuously provided via top horizontal folding lines 17 and 18. .. Further, at the upper ends of the body panels 5 and 7, a pair of end wall forming panels 22 and 23 having inner top seal panels 19 and 20 at the upper part and facing each other and one of which serves as a spout 21 are opened. It is connected continuously via the top horizontal folding lines 24 and 25. In the first example, the end wall forming panel 23 is used as the end wall forming panel on the opening side.

On the gable roof forming panels 15 and 16, guide folding lines 26 and 27 for guiding the bending of the gable roof forming panels 15 and 16 at the time of opening are formed on the side of the gable wall forming panel 23 on the opening side. Further, the gable roof forming panel 15 is composed of a first half cut 29 formed from the back surface side, which is a straw insertion port, and a second half cut 28 formed from the front surface side so as to surround the first half cut 29. A straw spout 30 is provided.

Folding lines 31, 32, 33, 34 for folding the end wall forming panels 22, 23 are formed on the end wall forming panels 22, 23. Further, substantially triangular surface portions 35, 36 surrounded by folding lines 31, 32, 33, 34 and top horizontal folding lines 24, 25 are formed.

At the time of forming the paper container, the pair of gable roof forming panels 22 and 23 are folded between the pair of gable roof forming panels 15 and 16, and the outer top seal panels 13 and 14 and the inner top seal panels 19 and 20 are predetermined. By being heated at the position, sealed and sealed, a gable roof type top 37 is formed on the paper container as shown in FIG. The top 37 of the formed gable roof mold is opened between the pair of gable roof forming panels 15 and 16, the opening side body panel 7 and the opening side end wall forming panel 23, and when the paper container is opened. A space 38 is formed in which a finger is put to put a finger on the gable wall forming panel 23 on the opening side. The substantially triangular surface portion 36 formed on the end wall forming panel 23 is located on the inner surface of the space 38.

Further, in the carton blanks 1, the body is formed on the body vertical folding lines 3 and 4 on both sides of the opening side body panel 7 which is connected to the opening side end wall forming panel 23 via the top horizontal folding line 25. A reference point 40 is set at a length L1 of 3 mm or more from the intersection 39 between the ends of the vertical folding lines 3 and 4 and the end of the top horizontal folding line 25.

The body panel 7 is formed with a downward arc-shaped first auxiliary folding line 43 in which ends 41 and 42 are arranged on the body vertical folding lines 3 and 4. The ends 41, 42 of the first auxiliary folding line 43 connect the reference points 40 to each other, or the positions near the reference points 40 and below the height direction reference points 40 on the body vertical folding lines 3 and 4. The ends 41 and 42 of the first auxiliary folding line 43 are separated from each other within a length L2 of 3 mm or more from the intersection 39 and 20% or less of the length of the top horizontal folding line 25. ..

When the length L1 is less than 3 mm, when the top 37 of the gable roof type of the paper container, which will be described later, is formed, when the pressure of mountain folding is applied from the top horizontal folding line 25, the bending load receiving portion 44 is subjected to a small force. It may buckle and fold from the first auxiliary folding line 43, resulting in a defective product having a distorted shape. Further, if the length L2 exceeds 20% of the length of the top cross-folding line 25, the bending load receiving portion 44 may not easily buckle when the paper container is opened, and a large force that causes trouble may be required. be.

The length L1 from the reference point 40 to the intersection 39 may be 3 mm or more, but the length L1 is preferably 3 to 4 mm. Further, the length from the ends 41, 42 of the first auxiliary folding line 43 to the intersection 39 may be 3 mm or more and 20% or less of the length of the top horizontal folding line 25, but the length L2 may be used. Is preferably 5 to 6 mm.
In this way, the bending load receiving portion 44 between the top horizontal fold line 25 and the ends 41 and 42 of the first auxiliary fold line 43 in the body panel 7 does not easily buckle with a small force, and the gable roof of the paper container. When forming the top 37 of the mold, when pressure is applied to fold the top from the top horizontal fold line 25, the force is transmitted to the first auxiliary fold line 43, and the shape is distorted due to the fold from the first auxiliary fold line 43. It is possible to more effectively prevent a situation in which the paper container is opened, and it is possible to easily open the paper container by buckling without requiring a large force when opening the paper container.

In the first example, a downward arc-shaped first auxiliary folding line 43 in which the ends 41 and 42 are arranged so as to connect the reference points 40 to each other is formed on the body panel 7. Therefore, in the first example, the length L1 and the length L2 have the same length.
Further, in the first auxiliary folding line 43, the lowest point 46 of the arc is located at the center of the body panel 7 on the opening side in the left-right direction, and is symmetrical.

The first auxiliary fold line 43 folds the body panel 7 from the first auxiliary fold line 43 when the top corner portion 54 of the tubular body portion 12 is pushed into the paper container when the paper container is opened, which will be described later. It is something that makes you. By folding the body panel 7 from the first auxiliary fold line 43 in a mountain fold, the bending load receiving portion 44 between the top horizontal fold line 25 of the body panel 7 and the ends 41 and 42 of the first auxiliary fold line 43 buckles. The upper end 45 of the body panel 7 is recessed, and the top corner 54 of the tubular body 12 is curved inside the paper container.

Further, in the first example, the shape of the first auxiliary folding line 43 is formed so that the lowermost point 46 having a downward arc shape is located at the center of the body panel 7 in the left-right direction. The top corner portion 54 can be easily pushed into the inside of the paper container from the central portion thereof.

Further, in the first example, the first auxiliary folding line 43 is formed symmetrically. As a result, the space 38 can be expanded symmetrically, and the shape of the space 38 can be made a shape that makes it easier to insert a finger.

Further, in the first example, bottom surface forming panels 47 and 48 are continuously provided at the lower ends of the body forming panels 5 and 7, and inner panels 49 and 50 are continuously provided at the lower ends of the body forming panels 6 and 8. The inner panels 49 and 50 are folded inside the bottom surface forming panels 47 and 48, the contact surfaces thereof are adhered to each other, and the bottom of the tubular body 12 is sealed to form the bottom 51 of the paper container. ing. The configuration of the bottom portion 51 is not limited to the configuration of the first example, and if the bottom portion of the cylindrical body portion 12 can be sealed, another known bottom portion configuration in the field of paper containers can be adopted.

Further, in the first example, as shown in FIG. 1, the upper side of the inner top seal panel 20 which is connected to the upper part of the end wall forming panel 23 on the side which becomes the spout 21 and is opened is linear. ..

Further, in the first example, the top horizontal folding line 25 is formed on the substantially triangular surface portion 36 provided on the opening side body panel 7 and the opening side end wall forming panel 23 from the direction of the central lowest point 46 of the first auxiliary folding line 43. A second auxiliary line 58 formed of a straight line extending in the direction of the apex 57 of the substantially triangular surface portion 36 is formed.

In the second auxiliary folding line 58, the lower end portion 59 on the lowermost point 46 direction side of the first auxiliary folding line 43 is located near the lowest point 46 or the lowest point 46 of the first auxiliary folding line 43, and the substantially triangular surface portion 36 It is preferable that the upper end portion 60 on the apex 57 side of the above is located in the vicinity of the apex 57 or the apex 57 of the substantially triangular surface portion 36.

In the first example, in the second auxiliary folding line 58, the lower end portion 59 is located at the lowest point 46 of the first auxiliary folding line 43, and the upper end portion 60 is located at the apex 57 of the substantially triangular surface portion 36. There is.

FIG. 2 shows another example of the second auxiliary fold line 58, in which the lower end portion 59 of the second auxiliary fold line 58 shown in FIG. 2 is located near the lowest point 46 of the first auxiliary fold line 43 and is on the upper side. The end portion 60 is located in the vicinity of the apex 57 of the substantially triangular surface portion 36.

Further, although not shown, the lower end portion 59 of the second auxiliary folding line 58 is located at the lowest point 46 of the first auxiliary folding line 43, and the upper end portion 60 is located near the apex 57 of the substantially triangular surface portion 36. Alternatively, the lower end 59 of the second auxiliary fold line 58 may be located near the lowest point 46 of the first auxiliary fold line 43, and the upper end 60 may be located at the apex 57 of the substantially triangular surface portion 36. It may be.

Further, in the first example, a first easy peeling region 52 is provided on the inner surface of the inner top seal panel 20 leaving end sealing areas having a predetermined width at both ends in the lateral length direction, and a pair of gable roofs located on both sides thereof. Approximately half of the inner surface of the outer top seal panels 13 and 14 connected to the upper parts of the forming panels 15 and 16 in the lateral length direction, and a predetermined width closer to the inner top seal panel 20 and closer to the inner top seal panel 20. A second easily peelable region 53 is provided which overlaps with the first easily peelable region 52, leaving the end seal area of the above. The first easy peeling region 52 and the second easy peeling region 53 are formed on both ends of the first easy peeling region 52 and the end portions closer to the inner top seal panel 20 in the second easy peeling region 53 from the upper side to the lower side. It has extension portions 52a and 53a that are inclined so that the panels 6, 7, and 8 sides are long, respectively.

The paper container of the first example is opened as follows. First, the top corner portion 54 of the cylindrical body portion 12 formed by bending the top horizontal folding line 25 is pressed so as to be pushed toward the inside of the paper container. As a result, the inner corner of the top corner 54 is opened as it is pushed into the inside of the paper container, and the upper end 45 of the body panel 7 protrudes outward from the top corner 54 downward. transform.

At this time, the upper end portion 45 and the substantially triangular surface portion 36 of the body panel 7 straddle the top horizontal folding line 25 from the direction of the lowest point 46 of the central portion of the first auxiliary folding line 43 and extend toward the apex 57 of the substantially triangular surface portion 36. Since the existing second auxiliary line 61 is formed, by pushing the top corner portion 54, the upper end portion 45 and the substantially triangular surface portion 36 of the body panel 7 are bent from the second auxiliary fold line 58 to the top corner portion. Induces the central portion of 54 to bend inside the paper container.

When a certain amount of force is applied, the first auxiliary fold line 43 folds in a mountain and becomes a protruding portion 55 protruding outward, and a fold line-shaped seat connecting the ends 41, 42 of the first auxiliary fold line 43 or its vicinity to the intersection 39. Bending 56 (indicated by the alternate long and short dash line in FIGS. 3 and 4) occurs.

Then, the top corner portion 54 bends toward the inside of the paper container about the central position, and the substantially triangular surface portion 36 forming the upper end portion 45 of the body panel 7 and the inner surface of the space 38 faces the inside of the paper container. And dent. As a result, the space 38 expands by the amount that the upper end portion 45 and the substantially triangular surface portion 36 are recessed, and a space 38 is formed in which a finger can be easily inserted at the time of opening.
The mode and location of buckling 56 that occurs at the upper end 45 of the body panel 7 are not constant, and are not limited to the positions shown in FIGS. 3 and 4.

Then, a finger is put into the expanded space 38, a finger is put on the wife wall forming panel 23 on the opening side, the wife wall forming panel 23 and the pair of gable roof forming panels 15 and 16 are expanded to the left and right, and the outer top seal panel 13 , 14 and the inner top seal panel 20 are peeled off from each other. Then, the gable wall forming panel 23 folded between the pair of gable roof forming panels 15 and 16 is pulled out, the spout 21 is opened, and the paper container is opened.

According to the paper container of the first example configured as described above, the body panel 7 on the opening side, which is connected to the end wall forming panel 23 on the opening side via the top horizontal fold line 25, has a body vertical fold line. On the 3rd and 4th, a reference point 40 separated from the intersection 39 of the end of the body vertical folding line 3 and 4 and the end of the top horizontal folding line 25 at a length L1 of 3 mm or more is set, and the body is vertical. A downward arc-shaped first auxiliary fold line 43 having ends 41 and 42 arranged on the fold lines 3 and 4 is formed, and the ends 41 and 42 of the first auxiliary fold line 43 are connected to each other by reference points 40 or reference points. It is arranged so as to connect the positions below the height direction reference point 40 on the body vertical folding lines 3 and 4 in the vicinity of 40, and the ends 41 and 42 of the first auxiliary folding line 43 are 3 mm or more from the intersection 39. Moreover, since they are separated from each other within a length L2 of 20% or less of the length of the top horizontal folding line 25, when forming the top 37 of the gable roof type of the paper container, the top horizontal folding line 25 is folded in a mountain. When pressure is applied, it is possible to prevent the bending load receiving portion 44 between the top horizontal folding line 25 and the ends 41 and 42 of the first auxiliary folding line 43 from buckling with a small force, and on the other hand, on the other hand, It does not require a strong force that can be painful to buckle.

As a result, when forming the top 37 of the gable roof type of the paper container, when pressure is applied to make a mountain fold from the top horizontal fold line 25, the ends 41, 42 of the top horizontal fold line 25 and the first auxiliary fold line 43 are applied. Since the bending load receiving portion 44 between the sides does not buckle with a small force, it is possible to effectively prevent a situation in which a defective product having a distorted shape is generated due to a mountain fold from the first auxiliary folding line 43. be able to.

Further, when opening the paper container, the bending load receiving portion 44 between the top horizontal folding line 25 and the ends 41 and 42 of the first auxiliary folding line 43 buckles without requiring a large force, so that the tubular body The top corner portion 54 of the portion 12 can be easily pushed in, and the upper end portion 45 of the body panel 7 can be recessed. Then, the upper end portion 45 of the body panel 7 is recessed, so that the top corner portion 54 is curved inward of the container, and the space for inserting a finger when putting a finger on the end wall forming panel at the time of opening is widened. It can be easily opened.

Further, due to buckling of the bending load receiving portion 44 between the top horizontal folding line 25 and the end portions 41 and 42 of the first auxiliary folding line 43 in the body panel 7, the deformed portion becomes a damper and the upper end portion of the body panel 7. Since the 45 can be maintained in the recessed state, the opening of the paper container can be facilitated.

Further, since the first auxiliary folding line 43 has an arc shape, when the paper container is opened, the top corner portion 54 or the vicinity of the top corner portion 54 of the tubular body portion 12 formed by bending the top horizontal folding line 25 is pushed in. At that time, the upper end portion 45 of the body panel 7 can be easily mountain-folded from the first auxiliary folding line 43, and the upper end portion 45 of the body panel 7 can be easily recessed.

Further, in the first auxiliary folding line 43, since the lowest point 46 of the arc is located at the center of the body panel 7 in the left-right direction, the top corner portion 54 of the cylindrical body portion 12 is moved from the center portion to the inside of the paper container. Easy to push.

Further, since the first auxiliary folding line 43 is formed symmetrically, the shape of the space 38 expanded by denting the upper end portion 45 of the body panel 7 becomes symmetrical, and a finger can insert the shape of the space 38. It can be made into an easy shape.

Further, in the second auxiliary fold line 58 composed of a straight line, the lower end portion 59 on the lowermost point 46 direction side of the first auxiliary fold line 43 is located near the lowest point 46 or the lowest point 46 of the first auxiliary fold line 43. Since the upper end 60 on the apex 57 side of the substantially triangular surface portion 36 is located near the apex 57 or the apex 57 of the substantially triangular surface portion 36, when the top corner portion 54 of the tubular body portion 12 is pushed in. , The substantially triangular surface portion 36 is more easily bent at the valley from the second auxiliary folding line 58. As a result, the central portion of the top corner portion 54 of the tubular body portion 12 is more effectively guided to bend inside the paper container, and the substantially triangular surface portion 36 and the upper end portion 45 of the body panel 7 are further formed. It can be easily dented.

Further, since the upper side of the inner top seal panel 20 is linear, the sealing area between the inner top seal panel 20 and the outer top seal panels 13 and 14 located on both sides of the inner top seal panel 20 is small, and the inner side. The top seal panel 20 and the outer top seal panels 13 and 14 can be easily peeled off.

Further, a first easily peelable region 52 is provided on the inner surface of the inner top seal panel 20, and a portion closer to the inner top seal panel 20 on the inner surface of the outer top seal panels 13 and 14 located on both sides thereof in approximately half in the lateral length direction. Since the second easy peeling region 53 that overlaps the first easy peeling region 52 is provided, the inner top seal panel 20 and the outer top seal panels 13 and 14 can be easily peeled off.

Further, the gable roof forming panel 15 is composed of a first half cut 29 formed from the back surface side, which is a straw insertion port, and a second half cut 28 formed from the front surface side so as to surround the first half cut 29. Since the spout 30 for the straw is provided, the liquid contents contained in the paper container can be taken out by the straw in addition to the formation of the spout 21.

5 to 8 show a second example of the embodiment of the paper container according to the present invention, FIG. 5 is a plan view showing carton blanks of the paper container of the second example, and FIG. 6 is shown in FIG. An explanatory view showing another example of the shape of the second auxiliary fold line shown, FIG. 7 is an enlarged side view showing a state in which the first auxiliary fold line and the second auxiliary fold line of the paper container formed from the carton blanks shown in FIG. 5 are bent. FIG. 8 is a perspective view of the paper container shown in FIG. 7.

The paper container according to the second example has the same basic configuration as the paper container of the first example, and the same configuration as that of the first example will be described with the same reference numerals.
The difference from the first example of the paper container of the second example is in the positions of the ends 41 and 42 of the first auxiliary folding line 43. As shown in FIG. 5, the first auxiliary folding line 43 of the second example is located near the reference point 40, away from the trunk vertical folding lines 3 and 4, and below the reference point 40 in the height direction. The ends 41 and 42 are arranged so as to connect the two.

The reference point 40 is separated from the intersection 39 by a length L1 of 3 mm or more as in the first example, and the ends 41 and 42 of the first auxiliary folding line 43 are the intersection 39 as in the first example. It is separated from each other within a length L2 of 3 mm or more and 20% or less of the length of the top cross-folding line 25.
When the length L1 is less than 3 mm, as in the first example, when the top 37 of the gable roof type of the paper container is formed, when a mountain folding pressure is applied from the top horizontal folding line 25, the paper container is bent with a small force. The load receiving portion 44 may buckle, and a defective product having a distorted shape may be generated due to a mountain fold from the first auxiliary folding line 43. Further, if the length L2 exceeds 20% of the length of the top cross-folding line 25, the bending load receiving portion 44 may not easily buckle when the paper container is opened, and a large force that causes trouble may be required. be.

The length L1 from the reference point 40 to the intersection 39 may be 3 mm or more as in the first example, but the length L1 is preferably 3 to 5 mm. Further, the length from the ends 41, 42 of the first auxiliary folding line 43 to the intersection 39 may be 3 mm or more and 20% or less of the length of the top horizontal folding line 25, but the length L2 may be used. Is preferably 5 to 6 mm.

In this way, as in the first example, the bending load receiving portion 44 between the top horizontal folding line 25 and the ends 41 and 42 of the first auxiliary folding line 43 in the body panel 7 is easily buckled with a small force. Instead, when forming the top 37 of the gable roof type of the paper container, when pressure is applied to fold the top from the top horizontal fold line 25, the force is transmitted to the first auxiliary fold line 43, and the fold is made from the first auxiliary fold line 43. It is possible to more effectively prevent the occurrence of defective products with distorted shapes, and it is easy to open the paper container by buckling without requiring a large force when opening the paper container. Can be done.
Since the other configurations are the same as those of the first example, the first example will be incorporated and the description thereof will be omitted.

To open the paper container of the second example, as in the first example, first, the top corner portion 54 of the cylindrical body portion 12 formed by bending the top horizontal folding line 25 is pressed so as to be pushed toward the inside of the paper container. do. As a result, the inner corner of the top corner 54 is opened as it is pushed into the inside of the paper container, and the upper end 45 of the body panel 7 protrudes outward from the top corner 54 downward. transform.

At this time, the upper end portion 45 and the substantially triangular surface portion 36 of the body panel 7 straddle the top horizontal folding line 25 from the direction of the lowest point 46 of the central portion of the first auxiliary folding line 43 and extend toward the apex 57 of the substantially triangular surface portion 36. Since the existing second auxiliary line 58 is formed, by pushing the top corner portion 54, the upper end portion 45 and the substantially triangular surface portion 36 of the body panel 7 are bent from the second auxiliary fold line 58 to the top corner portion. Induces the central portion of 54 to bend inside the paper container.

When a certain amount of force is applied, the first auxiliary fold line 43 folds in a mountain and becomes a protruding portion 55 protruding outward, and a fold line-shaped seat connecting the ends 41, 42 of the first auxiliary fold line 43 or its vicinity to the intersection 39. Bending 56 (indicated by the alternate long and short dash line in FIGS. 7 and 8) occurs.

Then, the top corner portion 54 bends toward the inside of the paper container about the central position, and the substantially triangular surface portion 36 forming the upper end portion 45 of the body panel 7 and the inner surface of the space 38 faces the inside of the paper container. And dent. As a result, the space 38 expands by the amount that the upper end portion 45 and the substantially triangular surface portion 36 are recessed, and a space 38 is formed in which a finger can be easily inserted at the time of opening.
Since the other opening procedures are the same as those of the first example, the first example is incorporated and the description thereof will be omitted.

According to the paper container of the second example configured as described above, the body vertical folding line 3 is connected to the opening side body panel 7 which is continuously provided to the opening side end wall forming panel 23 via the top horizontal folding line 25. A reference point 40 separated from the intersection 39 of the ends of the body vertical folding lines 3 and 4 and the end of the top horizontal folding line 25 at a length L1 of 3 mm or more is set on the body vertical folding lines 3. A downward arc-shaped first auxiliary folding line 43 having ends 41 and 42 arranged on 3 and 4 is formed, and the ends 41 and 42 of the first auxiliary folding line 43 are in the vicinity of the reference point 40 and have a body portion. The ends 41 and 42 are arranged so as to connect the positions separated from the vertical folding lines 3 and 4 and below the height reference point 40, and the ends 41 and 42 of the first auxiliary folding line 43 are intersections 39. Since they are separated from each other within a length L2 of 3 mm or more and 20% or less of the length of the top horizontal folding line 25, when forming the top 37 of the gable roof type of the paper container, the top horizontal folding line 25 is used. It is possible to prevent the bending load receiving portion 44 between the top horizontal folding line 25 and the ends 41 and 42 of the first auxiliary folding line 43 from buckling with a small force when a mountain folding pressure is applied. On the other hand, it can be buckled without requiring a strong force that would be painful to buckle.

As a result, as in the first example, when the top 37 of the gable roof type of the paper container is formed, the top horizontal fold line 25 and the first auxiliary fold line 43 are applied when a mountain fold pressure is applied from the top horizontal fold line 25. Since the bending load receiving portion 44 between the ends 41 and 42 of the paper does not buckle with a small force, a defective product having a distorted shape is generated due to a mountain fold from the first auxiliary folding line 43. The situation can be effectively prevented.

Further, when opening the paper container, the bending load receiving portion 44 between the top horizontal folding line 25 and the ends 41 and 42 of the first auxiliary folding line 43 buckles without requiring a large force. The top corner portion 54 of the tubular body portion 12 can be easily pushed in with almost the same force as the above, and the upper end portion 45 of the body portion panel 7 can be easily recessed. Then, the upper end portion 45 of the body panel 7 is recessed, so that the top corner portion 54 is curved inward of the container, and the space for inserting a finger when putting a finger on the end wall forming panel at the time of opening is widened. It can be easily opened.
Since the other effects are the same as those of the first example, the first example is incorporated and the description thereof will be omitted.

1 Carton blanks 2, 3, 4 Body vertical fold lines 5, 6, 7, 8 Body panel 9 Body vertical fold line 10 Vertical seal panel 11 Edge 12 Cylindrical body 13, 14 Outer top seal panels 15, 16 Gable roof forming panel 17, 18 Top horizontal folding line 19, 20 Inner top seal panel 21 Outlet 22, 23 Wife wall forming panel 24, 25 Top horizontal folding line 26, 27 Guide folding line 28 Second half cut 29 First half cut 30 Straw Outlet 31, 32, 33, 34 Folding line 35, 36 Approximately triangular surface 37 Top 38 Space 39 Intersection 40 Reference point 41, 42 End of first auxiliary folding line 43 First auxiliary folding line 44 Bending load receiving part 45 Opening Upper end of side body panel 46 Bottom point of first auxiliary folding line 47,48 Bottom forming panel 49,50 Inner panel 51 Bottom 52 First easy peeling area 52a Extension 53 Second easy peeling area 53a Extension 54 Top angle Part 55 Protruding part 56 Squatting 57 Top of substantially triangular surface 58 Second auxiliary fold line 59 Lower end of second auxiliary fold line 60 Upper end of second auxiliary fold line L1 Length from reference point to intersection L2 First auxiliary Length from the end of the polygonal line to the intersection

Claims (4)

It is made of a paperboard material with thermoplastic resin laminated on the front and back surfaces, has four body panels, and the edges are joined by a vertical seal panel to form a square tubular body, which is attached to the upper end of the body panel. A pair of gable roof forming panels having an outer top seal panel on the upper part and facing each other, and a pair of gable wall forming panels having an inner top seal panel on the upper part and facing each other, one of which serves as a spout and is opened. The pair of gable roof forming panels are folded between the pair of gable roof forming panels, and the outer top seal panel and the inner top seal panel are heated in a predetermined position to be sealed and sealed. In a gable-roofed paper container whose top is formed by
The body panel on the opening side, which is connected to the end wall forming panel on the opening side via the top horizontal fold line, has the body vertical fold line on both sides of the body panel on the opening side. A reference point is set at a distance of 3 mm or more from the intersection of the end portion and the end portion of the top horizontal folding line, and the reference points are set with each other, or in the vicinity of the reference point and on the trunk vertical folding line or the trunk vertical. A downward arc-shaped first auxiliary fold line whose ends are arranged so as to connect positions distant from the fold line and below the reference point in the height direction is formed, and is in the vicinity of the reference point and described above. The end of the first auxiliary fold line connecting the positions on the body vertical fold line or away from the body vertical fold line and below the reference point in the height direction is 3 mm or more from the intersection and lateral to the top. The first auxiliary is provided on the substantially triangular surface portion provided by the body panel on the opening side and the end wall forming panel on the opening side, which are separated from each other within a length of 20% or less of the length of the folded line. A second auxiliary fold line is formed from the direction of the lowest point at the center of the fold line, straddling the top horizontal fold line and extending in the direction of the apex of the substantially triangular surface portion, and the second auxiliary fold line is the second auxiliary fold line. 1 The lower end of the auxiliary fold line on the lowest point direction side is located at the lowest point of the first auxiliary fold line or near the lowest point, and the upper end on the apex side of the substantially triangular surface portion is said. A paper container characterized in that it is located at or near the apex of a substantially triangular surface portion. The paper container according to claim 1, wherein the upper side of the inner top seal panel, which is connected to the upper part of the end wall forming panel on the side that serves as a spout and is opened, is linear. The first easy peeling is performed on the inner surface of the inner top seal panel, which is connected to the upper part of the gable wall forming panel on the side that serves as a spout and is opened, leaving end seal areas having a predetermined width at both ends in the lateral length direction. A region is provided, and the portion closer to the inner top seal panel on the inner surface of the outer top seal panel, which is connected to the upper part of the pair of gable roof forming panels located on both sides of the region, is approximately half in the lateral length direction. A second easily peeling region is provided near the inner top seal panel so as to leave an end seal region having a predetermined width and overlap with the first easily peeling region, and the first easily peeling region and the second easily peeling region are Both ends of the first easily peelable region and the end near the inner top seal panel in the second easily peelable region have extension portions that are inclined so that the body panel side becomes longer from the upper side to the lower side. The paper container according to claim 1 or 2, wherein the paper container is provided. Claims 1 to 3, wherein the reference point is separated from the intersection by 3 to 4 mm in the vertical direction, and the end portion of the first auxiliary folding line is separated from the intersection by 5 to 6 mm. The paper container according to any one item.

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