JPH0411929Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Application Field] The present invention is a corrugated box flap sheet structure, which prevents the cardboard boxes from being crushed and the adhesive between the inner flap sheet and the outer flap sheet peeling off when the cardboard boxes are stacked. It is related to the structure of [Prior Art] To make a corrugated box using the rap-round method, the contents are sorted, a specified number of boxes are piled up on a conveyor, and then placed on a spread sheet of the corrugated box, which is then bent along the crease lines (referred to as ruled lines) of the box to form a box. After folding the inner flap sheet and the outer flap sheet in that order,
Adhesive is applied between the inner flap sheet and the outer flap sheet to create a cardboard box in which the contents are continuously packaged, and the cardboard boxes are stacked one after another. [Problems to be Solved by the Present Invention] When the cardboard boxes containing the contents are stacked as described above, as shown in FIG. 4, the cardboard boxes 31 located at the bottom are stacked on top. Due to the weight of the cardboard box 31, the outer flap sheet 32 of the cardboard box 31 is compressed from above, and as a result, due to the distortion of the outer flap sheet 32, the adhesive G between the outer flap sheet 32 and the inner flap sheet 33 peels off, causing the opening to open. In addition, as shown in Fig. 5, the cardboard box 34 is crushed by compression, and the two outer flap sheets 35 peel off the adhesive and are folded in the middle, resulting in significant damage to the appearance and the problem of complaints. are doing. Especially when the temperature is high such as in the summer, if stress that can cause shearing and peeling is applied for a long period of time,
The parts bonded with hot melt adhesive become more likely to peel off due to the heat-resistant creep phenomenon. In order to solve this problem, the above-mentioned problem may be solved to some extent by increasing the area of the bonded part during hot-melt bonding, but with this method, (1)
(2) Cardboard boxes are often recycled as waste paper, but increasing the amount of adhesive causes problems during recycling. Sushi is also not desirable. To provide a flap sheet structure for a corrugated box that uses the same adhesive as before without any increase in the amount of adhesive, and that does not cause peeling of the bonded portion of the inner flap sheet and outer flap sheet and crushing of the box when the corrugated boxes are stacked. It is in. [Means for Solving the Problems] The present invention provides a corrugated box in which a corrugated cardboard sheet is folded and an outer flap sheet and an inner flap sheet are glued together to seal the box. In addition, notches are formed at both ends of the inner flap sheet, so that when the cardboard boxes are stacked and the lower cardboard box receives an upper load, the outer flap sheet is cut out. The thin, band-shaped part of the box is compressed and deformed by the weight of the cardboard box on top, which prevents the adhesive part from peeling off from the inner flap sheet and the box from collapsing. [Function] The present invention is constructed as described above, and the compressed band-like thin wall portion of the outer flap sheet has a width of 5 to 15 mm, which is determined empirically based on the total weight of the upper cardboard box, and In addition, the thickness of the thin part is generally 1 to 3 mm when the thickness of the corrugated sheet is 3 mm.
Approximately 2 mm is preferable. That is, when the band-shaped thin wall portion formed along the ruled line of the outer flap sheet is compressed by the weight of the cardboard boxes stacked on top, the thin wall portion of the outer flap sheet deforms due to the weight.
Can absorb weight. In this case, since the inner flap sheet has notches formed at both ends thereof, it is not affected by the deformation of the thin portion of the outer flap sheet. Therefore, the compressive force due to the load on the upper part does not act on the outer flap sheet of the lower corrugated box, and therefore the adhesive between the outer flap sheet and the inner flap sheet is hardly affected by the load, and the adhesive part does not peel. can be prevented. Furthermore, since the adhesive portion between the outer flap sheet and the inner flap sheet does not come off, deformation of the entire cardboard box can be prevented, and the occurrence of defective products can be greatly reduced. When cutting the corrugated cardboard sheet into a predetermined shape using a press machine, a plate is attached to the thin band-shaped part formed along the ruled line of the outer flap sheet to compress it appropriately. This can be easily formed because the corrugated cardboard sheet can be compressed at the tip of the board at the same time as being cut out using a press. In this case, if a plate made of cork or the like is placed adjacent to the compression plate and pressed, cutting at the ruled lines can be prevented. [Embodiment] FIGS. 1 to 3 show an embodiment of the present invention, and the present invention will be specifically described below based on these drawings. FIG. 1 shows a developed view of the corrugated cardboard box of the present invention, in which outer flap sheets 2 and inner flap sheets 3 are alternately formed on both sides of the box body sheet portion 1. As shown in FIG. 2, strip-shaped thin walls are formed at the bases of the four outer flap sheets 2 and the box body sheet portion 1 along the ruled line R (indicated by the dotted line in the middle of FIG. 1), respectively, as shown in FIG. (the shaded area in FIG. 1) is formed. The thin wall portion 4 can be selected as appropriate depending on the weight of the cardboard boxes to be stacked, but generally the width is about 5 to 15 mm, and the thickness of the thin wall portion is about 2 mm (the thickness of the cardboard sheet is 3 mm). ) is desirable. Moreover, notches 5 are formed at both ends of the four inner flap sheets 3, respectively. FIG. 3 shows a stacked state of cardboard boxes 6 formed by enclosing the contents using the cardboard sheets of FIG. 1 and bonding the outer flap sheet 2 and the inner flap sheet 3 with adhesive. However, when the lower cardboard box 6a receives the weight of the upper cardboard box 6b, the outer flap sheet 2
The band-shaped thin wall portion 4 formed along the ruled lines is compressed and curved, and deformation of the outer flap sheet 2 can be prevented. In this case, since there are notches 5 at both ends of the inner flap sheet 3, the inner flap sheet 3
deformation can also be prevented. Therefore, since no distortion is applied to the bonded portion between the outer flap sheet 2 and the inner flap sheet 3 (marked G in FIG. 3), there is no risk that the outer flap sheet 2 and the inner flap sheet 3 will separate. Moreover, there is no possibility that the cardboard box 6 will be crushed by the load. Next, we made 5 sets of 3-tiered pallets and tested them, and the results are shown in the table below. One pallet is a total of 7 sets of 5 stacked cardboard boxes (311mm x 219mm x 437mm).
There are 35 cardboard boxes.Each cardboard box contains 20kg of flat sheets, and the weight of one pallet is
20Kg x 35 = 700Kg, the total weight of 3 stacked pallets is approximately 2000Kg.

[Table] [Effects of the invention] As described above, the present invention is achieved by forming a thin section obtained by compressing the outer flap sheet of the cardboard box in the vicinity of the ruled line of the outer flap sheet in packaging using a wrap-around type cardboard box. Since the thin wall portion can absorb the load when cardboard boxes are stacked together, compression of the outer flap sheet that occurs when cardboard boxes are stacked can be prevented, and peeling of the adhesive between the outer flap sheet and the inner flap sheet can be prevented. Not only can this be prevented, but there is also no crushing of the cardboard box due to load, which has the effect of significantly reducing complaints.

[Brief explanation of the drawing]

Fig. 1 is a developed view of a cardboard box according to an embodiment of the present invention, Fig. 2 is a cross-sectional view of a main part of a thin wall portion, Fig. 3 is a perspective view of an example of a state in which the cardboard boxes of the present invention are stacked, and Fig. 4 This figure is a perspective view of an example of a conventional stacked cardboard box, and FIG. 5 is another perspective view of a conventional stacked cardboard box. 1... Box body seat part, 2... Outer flap sheet, 3... Inner flap sheet, 4... Thin wall part, 5
...Notch.

Claims (1)

[Scope of utility model registration request] In the flap sheet of a corrugated box, in which a corrugated cardboard sheet is folded and an outer flap sheet and an inner flap sheet are adhered and sealed, a compressed band-shaped thin part with a width of 5 to 15 mm is formed along the ruled line of the outer flap sheet. , a structure of a flap sheet of a corrugated box, characterized in that notches are formed at both ends of the inner flap sheet.