JP2665898B2 - Square tube carton and molding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a box-shaped carton made of paperboard, corrugated cardboard, composite sheet material and the like, and more particularly to one-touch assembling such as a bottom surface of a carton stuck in a square tubular shape. The main object is the lock structure.

[0002]

BACKGROUND OF THE INVENTION For example, when filling a carton at a mass production site with medicines, foods, and various other products, the carton is automatically supplied, and a predetermined amount of the product is automatically supplied from the carton opening. It takes a production form that is filled in. At this time, the cartons are often folded, for example, into a flat plate at the stage of being supplied, and are formed into a square box shape before filling to prepare for filling.

Conventionally, in order to cope with such a production method, for example, as shown in FIG.
SIDE of respectively receiving the main flap 110 downwards, thereby extending form the approach main flap 120 through the folding border L _0, equipped with locking portions 131, 141 as can be locked to the receiving main flap 110 cartons C ₀ that is extended and formed via a folding border L ₀ from the flap 130, 140 other pair of side plates 103 and 104 are present.

At the time of assembling, a carton is formed into a rectangular tube by first pushing a bent opposite side, and then a receiving main flap 110, a pair of side flaps as shown in FIGS. 5 (a) and 5 (b). Flap 13
0, 140 in order from the bottom of the carton, and finally, as shown in FIG.
0 has been pushed inwardly to complete, for example, assembling the bottom of the carton C ₀ . Incidentally, based on such a configuration, Japanese Patent Laid-Open Publication No. Sho 59-30811 entitled "Assembled Paper Packaging Box" has been devised as a prior art for further strengthening the engagement state of the approach main flap.

[0005] As an improvement of such a method, as shown in FIG.
Adjacent pair of flaps 210 and 2 out of 30, 240
20, and also has the carton C ₁ which is joined at freely junction 250 bent mutually and a pair of flaps 230 and 240, in this case folded in the shape of a flat plate as shown in FIG. 6 (a) (b) is configured to bottom is formed at one time by raising the cartons C ₁ which is a rectangular tube.

In such prior art, first, FIG.
The problem described in (1) is that when the automatic assembling is performed, it is necessary to fold each flap at the bottom and further press the bottom evenly after being assembled in a half-assembled state, which is relatively complicated. Had. FIG.
Although the assembly itself is relatively easy, the type shown in (1) has a low productivity in that it requires bonding at the flap at the bottom, and the shape-retaining function after the bottom is formed. (Lock function) was also relatively weak. Incidentally, in the case of cartons for pharmaceuticals and the like, it is required by law to seal with a seal or the like a carton that does not have a sufficient locking function so as not to be opened unintentionally.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above background and the problems of the prior art, and is excellent in productivity and can be assembled with one touch in a relatively simple process. And, once assembled, an attempt was made to develop a novel square tube carton end face structure having an excellent shape-retaining function.

[0008]

According to a first aspect of the present invention, a square tube carton according to the first aspect of the present invention has an open end face which receives an operation in which a rectangular tube carton attached with a sack is raised from a flat folded state into a square tube shape. In the structure of the carton which is formed in a closed state, the blank shape of the carton is connected to the receiving main flap via one of the pair of opposing side plates at one open end face of the carton via a fold line, and The approach main flap is connected to the side plate via a fold line, and the guide side flap is connected to one of the other pair of opposing side plates via the fold line, and the other side plate is provided with a fold line. The receiving main flap is connected to the driven main flap, and the driven main flap, the guide side flap and the driven A receiving notch for receiving a part of the receiving flap is provided, and the entering main flap is provided with an engaging notch which engages with the receiving notch in the receiving flap in a constricted manner, and a guide side flap side. On the free end side, there are provided an approaching protruding piece protruding to near the corner of the open end face, and a retracting locking part protruding to engage with the driven side flap, and the guide side flap has a guide end piece. The driven side flap is provided so as to protrude toward the receiving flap, and the driven side flap is provided so as to protrude toward the receiving flap.

According to a second aspect of the present invention, in addition to the above requirements, in the folded state of the carton, a crease line between a side plate connected to the receiving main flap and a side plate connected to the guide side flap, In addition, in the folded state, the receiving main flap and the entering main flap are set in a flat state by being folded at a fold line between a side plate connecting the entering main flap and a side plate connecting the driven side flap. The guide side flaps and the driven side flaps are both folded inward.

[0010] Furthermore, a square tube carton according to claim 3 is a square tube carton to which a sack is attached, and one of a pair of opposed side plates on one open end face of the carton is provided with a crease line. The receiving main flap is connected to the side that closes the open end face in a bent state of approximately 90 °, and the other main side plate is connected to the incoming main flap in a bent state of approximately 90 ° to the side that closes the open end face through a fold line. ,
Further, the guide side flap is connected to one side of the other pair of opposing side plates through a fold line in a substantially 90 ° bent state to the side that closes the open end face, and the other side plate is connected through a fold line. The driven side flap is connected to the side that closes the open end face in an approximately 90 ° bent state, and a part of the entry main flap, the guide side flap, and the driven side flap is provided substantially at the center of the free end side of the receiving main flap. The main flap is provided with an engagement notch which engages with the reception notch in the receiving flap in a constricted manner in an opposed state,
The guide side flap is provided on the free end side on the guide side flap side with an approaching protruding piece protruding to near the corner of the open end face and a retractable locking portion protruding so as to engage with the driven side flap. Is provided so as to protrude the guide end piece toward the receiving flap side, and the driven side flap is provided so as to protrude the overlapped end piece toward the receiving flap side, and at a receiving notch in the receiving main flap, The free end side of the entering main flap is folded inside the carton, and the guide end piece of the guide side flap and the overlapped end piece of the driven side flap are further folded inside to form an end face. is there.

[0011] Further, in addition to the above requirements, the quadrangular cylindrical carton according to claim 4 is characterized in that the carton is made of E-standard corrugated cardboard.

Further, in the method of forming a rectangular tube carton according to a fifth aspect, the open end face is closed by receiving an operation in which the rectangular tube carton to which the sack is attached is raised from the flat folded state into the rectangular tube shape. In the method of forming a carton that is formed into a state, a receiving main flap is connected to one of a pair of opposed side plates at one open end surface of the carton via a crease line, and a crease line is attached to the other side plate. The main flaps are connected to each other through the guide flaps, and one of the other opposing side plates is connected to the guide side flaps via the fold line, and the other side plate is driven side flaps through the fold line. And a part of the entrance main flap, the guide side flap and the driven side flap is provided substantially at the center of the free end side of the receiving main flap. The main flap is provided with an engagement notch which engages with the reception notch in the reception flap in a constricted manner and has a free end on the guide side flap side. An approaching protruding piece protruding to near the corner of the open end face and a retractable locking portion protruding to engage with the driven side flap are provided, and the guide side flap projects the guide end piece toward the receiving flap side. The driven side flap is provided so as to project the overlapped end piece toward the receiving flap side, and in the folded state of the carton, a side plate connecting the receiving main flap, and a guide side flap. Creases between the side plate connecting the main flaps and the side plate connecting the driven side flaps. The receiving main flap, the entering main flap, the guide side flap, and the driven side flap are all folded inward in this folded state, and the carton is further folded into a flat folded state. In the middle of forming into a rectangular cylindrical shape from the above, while the retraction locking portion in the entry main flap guides the driven side flap to fall down before the receiving main flap, the entry projection in the entry main flap is , And enters between the guide end piece in the guide side flap and the receiving cutout in the receiving main flap.

In the present invention, the receiving main flap, the entering main flap, the guide side flap, and the driven side flap are interconnected with each other, and the flattened carton is raised into a square tubular shape. On the way, for example, a bottom plate serving as one end surface is formed. Specifically, the carton folded into a flat plate is sequentially raised in the middle of being raised into a rectangular cylindrical shape, and enters the receiving notch of the receiving main flap so that the entry end of the entry flap enters the inside of the box, and The guide side flaps assist in the movement, while the entry flaps fall from the folded state by approximately 90 ° while retracting further driven side flaps at the receiving end of the receiving flap, e.g. Make up.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the illustrated embodiments. First, FIG. 1 is a perspective view of a carton C provided at a bottom portion as an example of an end face structure of a rectangular tube carton according to the present invention, and in a completed state, as an example, is a square box-shaped carton having an upper portion opened like a lid. . This is made of, for example, an E-standard corrugated cardboard sheet, and four side plates 1 to 4 are connected to each other via a fold line L, and a glued piece 5 is further extended to a cut end side of the side plate 1. The glued piece 5 is glued to the inside of the side plate 4 on the other end side, and has a configuration in which the whole is affixed in a square tubular shape.

A cover plate 6 is connected to the upper side of the side plate 1 via a fold line L, and an insertion flap 7 is further connected to the free end side of the cover plate 6 via a fold line L. .
Also, the side plates 2 on both sides of the side plate 1 on which the lid plate 6 is provided,
The lid side flaps 8 are connected to the upper ends of the lids 4 via fold lines L, respectively. The upper edge of the side plate 3 facing the side plate 1 is partially cut out to form a finger hook 9.

As a characteristic feature of the present invention, the following flap group forming the carton bottom is provided. First the lower side plate 1 receiving the main flap 10 is provided via a folding border L _1, and connected further through a folding border L ₂ the guide side flaps 20 on the lower side of the side plate 2 adjacent to the side plates 1, further side plates A fold line L ₃ is provided below the side plate 3 facing 1
The main flap 30 is connected via the
Below the adjacent side plates 4 and articulating the driven side flaps 40 through a folding border L _4. These flap groups enable one-touch assembly of the bottom of the carton C and its shape retention.

First, the receiving main flap 10 is formed so that a receiving notch 11 is recessed in the center of its free end side, and the wing piece portion 12 which is relatively protruded,
13 on each side. In addition, the entrance main flap 30 at a position facing the receiving main flap 10 is in a state in which the central portion is narrowed, and engagement notches 31 and 32 are formed on both sides thereof in an opposed state, and the entrance main flap 30 is formed. An approaching protruding piece 33 is provided on one side of the front end side of the carton C to protrude to near the corner of the open end face of the carton C,
On the other hand, on the opposite side, a retractable locking portion 34 that engages with the driven side flap 40 is formed in a protruding piece shape.

The two side flaps provided between the receiving main flap 10 and the entering main flap 30 will be described. First, the guide side flap 20 has an engagement notch 21 opened to the receiving main flap 10 side. And a guide end piece 22 that is relatively protruded by the recess of the engagement notch 21.
On the other hand, the driven side flap 40 is the receiving main flap 1
It has an engagement notch 41 opened to the 0 side, and has an overlapped end piece 42 which is formed to be relatively protruded by the provision of the engagement notch 41.

The assembling state of the carton C having such a configuration will be described below. First, as shown in FIG. 3, the outer shape of the blank B is punched out of a raw material sheet made of, for example, E cardboard, and the like. The fold lines L, L _{1 to} L ₄ are formed simultaneously with the punching or in a separate step. The blank B is FIG 4 (a) (b) as shown in the receiving main flap 10, enters the main flap 30, the guide side flaps 20, such as tucked via a folding border L ₁ a driven side flaps 40 inward, respectively The state is further adjusted so that the folding line L between the side plates 1 and 2 and the folding line L between the side plates 3 and 4 out of the folding lines L separating the side plates 1 to 4 are substantially 180 ° folded. At the same time, the glued piece 5 and the side plate 4 are joined.

It is a preferable manufacturing method to fold such a bottom flap group before the bonding of the glued piece 5 and the side plate 4, that is, the so-called sack bonding, is a preferable manufacturing method. It is not a requirement. In such a state, first, the guide end piece 22 of the guide side flap 20 is attached to the receiving main flap 1.
It is folded so as to be entangled further inside the wing piece portion 13 from the receiving notch 11 at 0. In addition main approach flap 3
0, the retractable locking portion 34 is
Are engaged with each other so as to be entangled with the inside of the engagement notch 41.

The carton C to which the present invention is applied is mostly supplied in such a flat folded state, and the carton C folded into a flat plate at a stage prior to the step of filling the product is box-shaped. Molded into That is, as shown in FIG. 4 (a), when the two fold lines L, which are folded approximately 180 °, are pushed in opposingly, and the carton C on which the sack is attached is pushed up into a square tubular shape. Accordingly, a bottom portion which is an end surface of the rectangular tubular carton is formed.

That is, as shown in FIGS. 4A to 4D, the receiving main flap 10 and the entering main flap 30 are moved to a position where they are opposed to each other by being raised and raised into a rectangular tube shape, and the crease lines are formed. The distance between L ₁ and L ₃ increases, and the two act to fall down so as to be horizontal. At this time, the entry protrusion 33 of the entry main flap 30 is connected to the guide end piece 2 of the guide side flap 20.
2, and enters from the receiving notch 11 of the receiving main flap 10 so as to engage with the base side of the wing piece 13.

On the other hand, the retractable locking portion 34 of the approach main flap 30 acts to retract the driven side flap 40 while retracting it, and to engage this with the receiving notch 11 of the receiving main flap 10. I do. Further, as shown in FIG. 4 (d), after the engagement with the main flap 30 is completed,
4 engages near the corner of the receiving notch 11 of the receiving main flap 10 on the side of the wing piece portion 12, and in this portion, the driven side flap 40 and the receiving main flap 10 do not rise up again, so-called locked state. To keep.

Of course, this operation itself may be performed by mechanically raising the box, or by assembling manually. Further, if necessary, the assembled bottom flap group may be pressed from the inside of the carton C to the bottom side to form a complete flat plate. Note that the above-described embodiments apply a one-touch assembly structure to the bottom of a rectangular tubular carton, which is usually the most common case, and are generally referred to as one-touch bottom locks. In using the carton C, such a configuration may be applied to the side surface portion or the top plate portion.

[0025]

Since the present invention has the above-described structure, the side plate portion is pushed into the rectangular tube shape in the middle of assembling the carton C, which is formed into a rectangular tube shape during assembly. With a one-touch operation only for performing an operation, for example, a bottom plate portion is configured. Furthermore, according to the present invention, once assembled, the assembled state is maintained, and the contents can be securely stored.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a rectangular tube carton of the present invention.

FIG. 2 is a bottom view of the same.

FIG. 3 is a development view of the same.

FIG. 4 is an explanatory view showing step by step the formation process of the end face structure of the carton.

FIG. 5 is a perspective view showing stepwise a process of forming a carton end face structure having a conventional rectangular tube carton end face structure.

FIG. 6 is an explanatory view showing step by step the formation process of still another conventional end face structure.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 side plate 2 side plate 3 side plate 4 side plate 5 glued piece 6 lid plate 7 insertion flap 8 lid side flap 9 finger hook 10 receiving main flap 11 receiving notch 12 wing piece part 13 wing piece part 20 guide side flap 21 engagement Notch 22 Guide end piece 30 Entry main flap 31 Engagement notch 32 Engagement notch 33 Entry protruding piece 34 Retraction locking part 40 Follower side flap 41 Engagement notch 42 Overlapping end piece B Blank C Carton L Folding line L ₁ Folding line L _2- fold ruled line L _3- fold ruled line L _4- fold ruled line

Continued on the front page (72) Inventor Masaei Yoshimori 1-13-3 Jokita-machi, Takatsuki-shi, Osaka Prefecture Inside Saison Paper Container Co., Ltd. (72) Inventor Takashi Furuta 1-13-3, Jokita-machi, Takatsuki-shi, Osaka Saisei Paper Kiki Co., Ltd.

Claims (5)

(57) [Claims] In a carton structure in which an open end face is formed in a closed state by receiving an operation in which a square-shaped carton to which a sack is attached is raised from a flat folded state into a square tubular shape, a carton blank is provided. The shape is connected to the receiving main flap via a fold line on one side of a pair of opposed side plates on one open end surface of the carton, and on the other side plate is connected with the incoming main flap via a fold line, Further, a guide side flap is connected to one of the other pair of side plates via a fold line, and a driven side flap is connected to the other side plate via a fold line, and the receiving main flap is connected to the other side plate. A receiving notch for receiving a part of the entry main flap, the guide side flap, and the driven side flap is provided substantially in the center of the free end side, and The approach main flap is provided with an engagement notch that engages with the reception notch in the reception flap in a constricted manner in a constricted manner, and the approach flap protrudes from the free end side of the guide side flap side to near the corner of the open end face. A projecting piece and a retractable locking portion projecting so as to be engaged with the driven side flap. The guide side flap is provided by projecting a guide end piece toward the receiving flap side. A square tube carton, wherein the side flaps are provided so that the overlapping end pieces protrude toward the receiving flap side. 2. In the folded state of the carton, a folding line between a side plate connected to a receiving main flap, a side plate connected to a guide side flap, a side plate connected to an entering main flap, and a driven side flap. It is set in a flat plate state by being folded at a fold line between the connected side plates, and in this folded state, the receiving main flap, the approach main flap, the guide side flap, and the driven side flap are all folded inward. 2. The rectangular tube carton according to claim 1, wherein: 3. A square-carton carton with a sack stuck thereon, wherein one of the pair of opposed side plates on one open end face of the carton closes an open end face of the receiving main flap through a crease line. The main flap is connected to the other side plate through a fold line in a substantially 90 ° bent state to the side that closes the open end face, and the other side plate is further connected to the other side plate. One side of the guide side flap is connected to the side closing the open end face through a fold line in a substantially 90 ° bent state, and the other side plate is closed with the driven side flap open side face via a fold line. Side of the receiving main flap, and a part of the inflow main flap, the guide side flap, and the driven side flap is received substantially in the center of the free end side of the receiving main flap. The main flap is provided with an engagement notch that engages with the reception notch in the reception flap in a constricted manner, and is open to the free end side on the guide side flap side. It is provided with an approaching protruding piece protruding to near the corner of the end face, and a retracting locking portion protruding so as to engage with the driven side flap, and the guide side flap protrudes the guide end piece toward the receiving flap side. The driven side flap is provided so as to project the overlapped end piece toward the receiving flap side, and in the receiving notch in the receiving main flap, the free end side of the entering main flap enters the carton. The guide end piece on the guide side flap and the overlap end piece on the driven side flap are further folded inside the end face. A square tube carton characterized by comprising: 4. The carton according to claim 1, wherein the carton is made of E-standard cardboard.
A square tube carton as described. 5. A method for forming a carton, wherein an open end face is formed in a closed state by an operation in which a rectangular carton with a sack is folded into a rectangular shape from a folded state in which the carton is folded into a flat shape. In one open end face, the receiving main flap is connected to one of the pair of opposing side plates via a fold line, and the incoming main flap is connected to the other side plate via a fold line. A guide side flap is connected to one of the pair of opposed side plates via a fold line, a driven side flap is connected to the other side plate via a fold line, and a free end side of the receiving main flap is connected. In the approximate center of the receiving main flap, the guide side flap, and a receiving notch for receiving a part of the driven side flap is provided,
In addition, the approach main flap is provided with an engagement notch that engages with the reception notch in the reception flap in a constricted manner, and protrudes from the free end side on the guide side flap side to near the corner of the open end face. An entrance projection, and a retractable locking portion projecting so as to engage with a driven side flap, and the guide side flap is provided by projecting a guide end piece toward a receiving flap side; The driven side flap is provided so that the overlapped end piece protrudes toward the receiving flap, and in the folded state of the carton, the folded side between the side plate connected to the receiving main flap and the side plate connected to the guiding side flap. A flat line is formed by being folded at the fold line between the side plate connecting the ruled line and the entering main flap and the side plate connecting the driven side flap. In this folded state, the receiving main flap, the entering main flap, the guide side flap, and the driven side flap are all folded inward, and the carton is further formed into a square tubular shape from the flat folded state. On the way, the retractable locking portion of the approach main flap guides the driven side flap so as to fall down before the receiving main flap, and the approach projection of the approach main flap is connected to the guide end of the guide side flap. A method of forming a rectangular tube carton, wherein the rectangular shape carton is inserted between a piece and a receiving notch in a receiving main flap.