JPH07257547A - Leakproof carton - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a liquid leakage prevention carton having webs at the four corners, which is easy to fold from a folded state when packing a high moisture content box. [Structure] Folding lines 10 and 1 on the front and rear edges of a rectangular bottom plate 1.
Front and rear side walls 2 and 2'which are opposed to each other via 0 ', and left and right side walls 3 and 3'which are opposed to each other via folding lines 11 and 11' are connected to the left and right end edges of the bottom plate 1 to form the rear side wall 2 '. In the carton in which the top plate 4 is connected to the extended portion of the front panel through the folding line 12, the folding piece 7 connected to the both end edges of the front and rear side walls 2 and 2'through the folding line and the folding line at both end edges of the left and right side walls. It is characterized in that the folding pieces 8 connected to each other via 4 are connected at four corners via the folding line 14, and the central portion of one of the connecting pieces 7 and 8 is punched out. To do.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct packing carton having a liquid leakage preventing function.

[0002]

2. Description of the Related Art Conventionally, a carton for cooked foods, such as sauces, gravy, sauces, frozen foods, etc., which has been folded without cutting the four corners of the carton blank in order to prevent liquid leakage from the four corners. Oyster) Corner type carton is used. Generally, a box former is used for this type of carton molding, and when the box former is used to immediately fill and close the lid, the carton molded by the box former is temporarily flattened with the corners connected. The carton is folded up, brought to a predetermined place, and then the carton is raised again to fill the contents and close the lid. The hot melt bonding method is generally used for carton molding. FIG. 2 shows an example of a conventionally used web-corner type carton blank.
2 ', 23, 23' are connected to each other, and the side wall 22 'is further extended to provide a top plate 24 having a flap.
A web of folded portions 25 and 26 is formed at both ends of each side wall. When this blank is formed into a rectangular carton, the folding pieces 25, 26 at the four corners are formed.
The web consisting of is folded into the outer or inner side of the carton in an ear-like shape, and the folding piece 27 and the left and right side walls 23, 2 are formed.
The opposing portions 27 'of 3'are bonded and molded as shown in FIG. 4 (b). In addition, as shown in FIG. 3, there has been proposed a carton in which the web is folded inside and locked without using an adhesive. That is, the bottom plate 31, the side wall 3
2, 32 ', 33, 33', and a top plate 34 having flaps on three sides and folding pieces 35, 36. The folding pieces 35, 36 are folded inside the carton and then the left and right side walls 33, The folded web is locked by 33 'and lock pieces 37, 37' provided on the folding piece 35.

[0003]

FIG. 4B is a perspective view showing a folded portion 28 when the conventional carton blank shown in FIG. 2 is formed by folding the folding pieces 25 and 26 outside the carton. Further, FIG. 5 (c) shows a horizontal cross section of the folded portion, but the folded portion 28 has a non-adhesive surface and has a bulge at a place where it becomes thick due to the triple structure, and as a result, the left and right side walls are formed. A force is applied to push it inward, that is, in the direction of the arrow, and especially when using the carton that has been folded into a flat shape as described above, not only the left and right side walls but also the front and rear side walls are less likely to occur, and the opening becomes narrower. There is a problem that filling is difficult. In particular, there is a problem that the work efficiency is decisively lowered when a plurality of items are packed on the entire surface of the carton. In the case of the lock method described above, the structure of the four corners is weaker than in the adhesive method, and the bulge described above cannot be eliminated. Also, the box former becomes more complicated because it needs to incorporate a locking mechanism. The present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid-leakage-preventing carton that eliminates the bulge of the web folding portion 28, opens the carton widely during filling or assembling, and enhances the work efficiency. .

[0004]

SOLUTION: The front and rear side walls of the rectangular bottom plate are connected to the front and rear end edges of the bottom plate via folding lines, and the left and right side walls of the bottom plate are connected to each other via the folding lines. In a carton in which a top plate is connected to an extension portion of a rear side wall via a folding line, a folding piece connected to both end edges of the front and rear side walls via a folding line and a folding piece connected to both end edges of the left and right side walls via a folding line. The folding pieces are connected to each other at four corners through folding lines, and the center portion of one of the connected folding pieces is punched out.

[0005]

According to the present invention, the folds of the web-folded portions at the four corners of the web-corner type carton are eliminated, the carton is apt to occur, and the appearance is excellent. Further, the box former can be used as it is by the conventional bonding method.

[0006]

The present invention will be described in more detail with reference to the drawings.
FIG. 1 is a blank development view of a liquid leakage prevention carton according to the present invention. Side walls 2 and 2'via folding lines 10 and 10 ', and side walls 3 via folding lines 11 and 11' to the front, rear, left and right of the top plate 1.
3'is connected, the side wall 2'is extended, and the top plate 4 having the flap 5 is connected via the fold line 12, and the side walls 2, 2 ',
Folding lines 7 and 8 connected to both ends of 3, 3'via folding lines 11, 11 ', 10, 10' are connected via folding lines 14 to form corner webs at the four corners. The side walls 3, 3'are further extended with small flaps 6, 6 '. 8 of the two folded pieces 7 and 8 that are connected
Is punched out to form a punched window 9. Folding piece 7 and left and right side walls 3, 3'parts 15, 1
5 ′ face each other through the window 9 to form an adhesive portion (shown by a fan-shaped dot). When a box former is used to form a hot melt adhesive on one of the facing adhesive portions 15 and 15 'of the blank described above, the blank is assembled into a carton as shown in FIG. 4 (a). Next, fold the opposing left and right side walls inward along the fold line 13,
At the same time, the front and rear side walls also collapse, allowing the entire carton to be folded flat. At the time of filling, the state of FIG. 4 (a) is raised again, and after filling or assembling the contents, the small flaps 6 are bent inward, the top plate 4 is covered, and the flaps 5 are inserted to complete the filling or sealing operation. If you pay attention to the folding parts (ears) 17 of the four corners of the web,
As shown in FIGS. 5 (a) and 5 (b) of the horizontal cross section of the web folding part of FIG. 5, unlike the web folding part 28 of the conventional carton shown in FIG. 5 (c), there is almost no bulge and the four corners are firmly fixed. Come on. This is because the folding piece 7 connected to the front and rear side walls through the punching window 9 is directly adhered to the outer side (the inner side in the case of inward folding) of the left and right side walls 3, 3'by an adhesive. FIG. 5A shows the case where the web is folded outside, and FIG. 5B shows the case where the web is folded inside. The center portion of the folded portion (ear) 17 has a two-layer structure with an adhesive layer 18 sandwiched therebetween. Therefore, when the folded carton is raised again, the left and right side walls are more likely to occur in a state closer to vertical than before, and the front and rear side walls are also raised accordingly, so the opening of the carton becomes wider and the filling work of the contents becomes extremely easy It has the effect of improving work efficiency. In addition, the appearance of the carton will be improved.

(Example) Paper base material having a basis weight of 400 g / m ²
Using the above coated ball, a side wall having a height of 60 mm was connected to a bottom plate of 243 × 243 mm, and webs of 60 mmR were provided at the four corners. A fan-shaped window as shown in FIG. 1 was punched along the folding lines 10 and 14 in the folding pieces connected to both ends of the left and right side walls. The reason why the punched window is aligned with the folding line in this way is to make the area of the window as large as possible to facilitate the gluing and reduce the resistance when the web is folded. In addition, the fold line of the small flaps 6 and 6'is rough perforation 1
It was set to 6 so that it could be easily folded inward by hand. As the hot melt adhesive, a strong acrylic resin adhesive was used.

The range of paper base materials used in the liquid leakage prevention carton according to the present invention is extremely wide, and almost all paperboards such as coated balls, craft balls, and Manila balls can be used, and the basis weight is in the range of 300 to 450 g / m ² . Is preferred. Also,
In order to prevent liquid leakage, use of double-sided polyethylene-coated paper, resin-impregnated paper, etc. is perfect, but depending on the contents to be packed, it is also possible to use paperboard alone. Especially if it is a card type, there is no problem. Printing is generally performed on the surface of the carton, but any method such as offset, gravure, or flexographic printing may be used. Post processing such as overcoating, polishing, and embossing can be freely performed. However, it is preferable that there is no overcoat layer or the like in the portions corresponding to 15 and 15 'of the adhesive portion.

[0010]

According to the present invention, since the left and right side walls are not bulged and the four corners are solid, the side walls are likely to rise vertically when the folded carton is raised, and the filling or assembling of the contents is facilitated and the efficiency of the filling work is improved. Can be enhanced. Also, the appearance of the carton will be improved. Furthermore, the thickness of the folded carton is reduced, which shows the effect of reducing the stock space.

[Brief description of drawings]

FIG. 1 is a development view of a liquid leakage prevention carton according to the present invention.

[Fig. 2] Development view of a conventional adhesive-type liquid leakage prevention carton

FIG. 3 Exploded view of a conventional lock type liquid leakage prevention carton

FIG. 4 is an assembly diagram of a liquid leakage prevention carton (a) In the case of the present invention (b) In the case of the conventional adhesive type

FIG. 5 is a horizontal cross-sectional view of a folded portion of the web.

[Explanation of symbols]

 1 Bottom plate 2 Front side wall 2'Rear side wall 3 Left side wall 3'Right side wall 4 Top plate 5 Top plate flap 6 Small flap 6'Small flap 7 Folding piece 8 Folding piece 9 Punching window 10 Folding line 10 'Folding line 11 Folding line 11' Folding line 12 Folding line 13 Folding line 14 Folding line 15 Adhesive part 15 'Adhesive part 16 Rough perforation 17 Folding part (ear) 18 Adhesive layer 21 Bottom plate 22 Front side wall 22' Rear side wall 23 Left side wall 23 'Right side wall 24 Top plate 25 Folding piece 26 Folding piece 27 Adhesive part 27 'Adhesive part 28 Folding part (ear) 31 Bottom plate 32 Front side wall 32' Rear side wall 33 Left side wall 33 'Right side wall 34 Top plate 35 Folding piece 36 Folding piece 37 Lock piece 37' Lock piece

Claims (1)

[Claims] 1. An extension of the rear side wall, wherein front and rear side walls of the rectangular bottom plate are connected to front and rear side walls opposed to each other via folding lines, and left and right side walls of the bottom plate opposed to each other are connected to each other via folding lines. In a carton formed by connecting top plates to each other via folding lines, folding pieces connected to both end edges of the front and rear side walls via folding lines and folding pieces connected to both end edges of the left and right side walls via folding lines. Is connected at four corners via a fold line, and the center portion of one of the connected folding pieces is punched out, and a liquid leakage prevention carton is provided.