JP5600494B2 - Packaging box - Google Patents

Description

  The present invention is formed by corrugated paperboard composed of a pair of liners and a stepped core between both liners, and by adhering an outer flap to the outer side of an inner flap that is connected to a square cylindrical body. The present invention relates to a sealed packaging box.

  Conventionally, a rectangular box-shaped body is formed by four rectangular side plates, and a packaging box is known that seals each of the open ends of the body by bonding four flaps (for example, Patent Document 1).

  This type of packaging box is generally referred to as a wrap-around case, and after placing a package object with any one side plate constituting the body as a bottom plate, each fold line is wrapped around the package object. Are assembled by bending each part along and bonding with an adhesive.

  And since this type of packaging box is structured so that it can be assembled very easily and packaged objects can be packaged at the same time as assembly, assembly and packaging operations using an automatic machine are generally adopted, and packaging and packaging of articles such as canned beer It is used for transportation.

JP 2002-012226 A

  This type of packaging box wraps a packaged item having a relatively large weight such as canned beer. Further, when a plurality of packaging boxes in which packages having a relatively large weight are packaged are stacked, there is a possibility that the adhesion of the flap is peeled off by the load and the sealed state cannot be maintained. Further, even when the flap is pulled by being in contact with the outside, the adhesion is easily peeled off and the sealed state may not be maintained. For this reason, there is a disadvantage in that the amount of adhesive used must be increased and the cost is high.

  In view of the above points, an object of the present invention is to provide a packaging box that can reduce the amount of adhesive used without reducing the adhesive strength between flaps.

The present invention is formed by a corrugated paperboard made up of a pair of liners and a stepped core between the liners, and a crease line is formed at a position opposite to one of the square cylindrical body and the open end of the body. A pair of inner flaps that are connected to each other and a pair of outer flaps that are connected to each other at a position opposite to the open end of the trunk portion via a crease line, and the inner flap and the outer flap. When bent in the opposite direction to each other, the liner on the inner side surface of each outer flap is formed with a pair of overlapping surfaces on which the pair of inner flaps overlap, and an adhesive is applied to each overlapping surface of each outer flap to In the packaging box sealed by adhering to the flap, a plurality of perforations made of a plurality of cuts having a predetermined length are formed in parallel to each other on the liner on which the outer flap overlapping surface is formed, For each overlapping surface Tsu respect to a straight line connecting the center of the base end edge with one end of the leading edge of the outer flap flop longitudinal direction of each cut is formed to be inclined so as to intersect the longitudinal direction of the cuts, the outer flap It is characterized in that it is inclined at an angle in a range of 30 ° to 50 ° with respect to a line along the longitudinal direction of the base end edge .

  When the inner flap and the outer flap are folded and overlapped with each other, the side halves of the two inner flaps overlap with each other, so that a pair of overlapping surfaces are formed on the inner surface side of each outer flap. It is formed.

  The packaging box of this invention apply | coats an adhesive agent for every this polymerization surface, and adhere | attaches the inner surface of an outer flap on the outer surface of an inner flap. At this time, since the perforation is formed on each polymerization surface, the adhesive enters each cut of the perforation. Thereby, the adhesive strength of flaps can be improved. The perforation is provided only on one of the inner liners of the pair of liners constituting the outer flap. That is, the perforation is formed in a so-called half-cut state that does not penetrate in the thickness direction of the outer flap. Thereby, the strength of the outer flap itself hardly decreases.

  Furthermore, in the present invention, each cut of the perforation is formed so as to be inclined as described above. According to this, even if distortion of the packaging box occurs in the diagonal direction of the surface sealed by the outer flap and the inner flap, the adhesive crosses the direction of the force to be peeled off at that time. The adhesive is locked and the adhesive state is firmly maintained.

  Therefore, according to the present invention, the adhesive strength between the flaps can be improved without increasing the amount of adhesive, and even if the amount of adhesive used is reduced, the packaged material having a relatively large weight can be packaged. When a plurality of layers are stacked, the sealed state can be reliably maintained.

In addition, the present inventor has shown that the longitudinal direction of each perforation is extremely high by applying an inclination of 45 ° to the line along the longitudinal direction of the base end edge of the outer flap by various tests. We know that bond strength can be obtained.

An explanatory perspective view showing a packaging box of an embodiment of the present invention. The expanded view of the packaging box of this embodiment. Explanatory drawing which shows an outer flap. Explanatory drawing which shows a perforation.

  An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the packaging box 1 of the present embodiment is formed in a rectangular parallelepiped shape by closing a rectangular tube-shaped body portion 2 with an inner flap 3 and an outer flap 4, and accommodates an unillustrated packaged object inside. doing.

  The packaging box 1 is formed by folding and bonding a piece of corrugated paperboard shown in FIG. Well-known corrugated paperboard is used as a material for the packaging box 1, and although not shown in detail, a front liner that is the outer surface of the packaging box 1, a back liner that is the inner surface of the packaging box 1, and a front liner It consists of a stepped core that is interposed between the back liner and bonded together.

  The corrugated paperboard shown in FIG. 2 includes a rectangular bottom plate 5, a pair of side plates 6 connected to both sides of the bottom plate 5 via a crease line, and one (right side in the figure) side plate 6 via the crease line. A top plate 7 provided continuously and an adhesive piece 8 provided continuously to the other side plate 6 (left side in the figure) via a crease line are provided.

  A pair of inner flaps 3 is connected to each side plate 6 via a fold line, and a pair of outer flaps 4 are connected to the top plate 7 and the bottom plate 5 via a fold line.

  The developed view of FIG. 2 illustrates a surface (inner surface) which becomes the inner surface side when the packaging box 1 is formed. A plurality of perforations 9 are formed at predetermined positions on the inner side surface of the outer flap 4. The perforation 9 is constituted by a plurality of cuts 10 having a predetermined length. In the present embodiment, the length dimension of each cut line 10 and the distance dimension between the cut lines 10 are both 3 mm, and the distance between the perforations 9 arranged in parallel to each other is 6 mm.

  The perforation 9 is formed only on the back liner of the outer flap 4 and is formed in a so-called half-cut state that does not penetrate to the front liner. Thereby, the strength reduction of the outer flap 4 due to the provision of the perforation 9 is prevented.

  Further, as shown in FIG. 1, when the body 2 is closed by the inner flap 3 and the outer flap 4, each outer flap 4 has a side half of the pair of inner flaps 3 as shown in FIG. A part is formed on the polymerization surface 11 on which polymerization occurs. The perforation 9 is provided on the overlapping surface 11 at a position where an adhesive is applied.

  And the perforation 9 is one end of the base end edge 12 (end edge along the crease line of the boundary with the top plate 7 or the bottom plate 5) of the outer flap 4 for each overlapping surface 11 as shown in FIG. Are formed so as to incline so that the longitudinal direction of each cut line 10 intersects a straight line L connecting the center of the front edge 13 of the outer flap 4. And the perforation 9 is formed so that angle (theta) with respect to the base end edge 12 of the outer flap 4 may be 45 degrees, as shown in FIG.

  When assembling the packaging box 1 shown in FIG. 1 from the corrugated cardboard shown in FIG. 2, first, the side plates 6 are raised from the bottom plate 5, the top plate 7 is bent in the horizontal direction so as to face the bottom plate 5, and further bonded. The piece 8 is superposed and bonded to the outside of one side plate 6. Thereby, the square cylinder-shaped trunk | drum 2 is formed.

  By forming the square cylindrical body 2, the pair of inner flaps 3 are opposed to each other at the open ends of the body 2, and the pair of outer flaps 4 are in a direction perpendicular to the facing direction of the inner flap 3. It will be in the opposite state.

  Next, each inner flap 3 is folded inward with respect to the side plate 6, and each outer flap 4 is folded inward with respect to the bottom plate 5 or the top plate 7, and the outer flap 4 is superposed on the inner flap 3. Prior to this polymerization operation, an adhesive is applied to a position corresponding to the perforation 9 of the overlapping surface 11 of the outer flap 4, and the outer flap 4 is superposed on the inner flap 3 to bond them together. Thereby, the packaging box 1 shown in FIG. 1 is formed. In FIG. 1, reference numeral 14 indicates a bonded portion by an adhesive. Since the perforation 9 is formed in the bonding portion 14, the bonding state between the inner flap 3 and the outer flap 4 is firmly maintained.

  In the present embodiment, a hot melt adhesive (hot melt adhesive) is used as the adhesive. The hot melt adhesive is discharged in the form of a string while being heated and melted from a nozzle of an adhesive supply device (not shown), and the outer flap 4 is superposed on the inner flap 3 and brought into pressure contact with each other. Extended between. Thereafter, the hot-melt adhesive is cooled and solidified, whereby the inner flap 3 and the outer flap 4 are firmly bonded.

  When the heated and melted string-like adhesive expands between the inner flap 3 and the outer flap 4, the adhesive enters each cut 10 of each perforation 9 and is engaged with the back liner of the outer flap 4. It becomes a state. And since each cut | interruption 10 is inclined and provided with respect to the straight line L shown in FIG. 3 as mentioned above, the tensile strength from the center of the outer flap 4 becomes very strong.

  The inventor conducted a test to compare the adhesive strength between the present embodiment and a packaging box (not shown) in which the perforation 9 is not provided on the back liner of the outer flap 4. In this test, a load measuring device was hooked on the tip of the outer flap 4, an outer pulling force was applied to the outer flap 4, and a load at the time of peeling from the inner flap 3 was measured. The amount of hot melt adhesive applied was compared based on the length of the string discharged from the nozzle of the adhesive supply device. The application direction of the hot melt adhesive was the longitudinal direction of the outer flap 4 in FIG.

  And as a result of the said test, what provided the perforation 9 in the outer flap 4 can confirm that the intensity | strength of 25%-35% is improving with respect to the thing which does not provide the perforation 9. It was.

  Therefore, in the case where the perforation 9 is not provided, it is necessary to increase both the application of the adhesive in order to improve the adhesive strength. However, by providing the perforation 9, the adhesive strength can be increased without increasing the amount of the adhesive. Can be improved. Moreover, when the adhesive force equivalent to the thing which does not provide the perforation 9 is required, the application quantity of an adhesive agent can be reduced and cost can be reduced, obtaining sufficient adhesive force.

  In the present embodiment, as shown in FIG. 4, by forming each perforation 9 so that the angle θ with respect to the base end edge 12 of the outer flap 4 is 45 °, the highest adhesive strength can be obtained. However, according to various tests conducted by the present inventors, it has been found that if the angle θ is inclined at an angle in the range of 30 to 50 °, the adhesive strength is drastically improved. . Further, the adhesive strength is improved if each cut line 10 is not in the direction along the straight line L shown in FIG.

  DESCRIPTION OF SYMBOLS 1 ... Packaging box, 2 ... Body part, 3 ... Inner flap, 4 ... Outer flap, 9 ... Perforation, 10 ... Cut, 11 ... Superposition surface, L ... Straight line.

Claims (1)

Formed by corrugated paperboard consisting of a pair of liners and a stepped core between both liners, and connected in series through a crease line to the opposite side of the square cylinder body and the open end of the body A pair of inner flaps and a pair of outer flaps connected to each other at opposite positions of the open end of the body portion via a crease line, the inner flaps and the outer flaps facing each other. When folded, the liner on the inner side surface of each outer flap is formed with a pair of overlapping surfaces on which the pair of inner flaps are superposed, and an adhesive is applied to each overlapping surface of each outer flap to adhere to the inner flap. In the packaging box sealed by
A plurality of perforations made of a plurality of cuts of a predetermined length are formed in parallel to each other on the liner on which the outer flap overlapping surface is formed,
The perforation is formed so as to be inclined so that the longitudinal direction of each cut intersects with a straight line connecting one end of the base end edge of the outer flap and the center of the front end edge of the outer flap for each overlapping surface. It is,
The packaging box , wherein the longitudinal direction of the cut is inclined at an angle in a range of 30 ° to 50 ° with respect to a line along the longitudinal direction of the base edge of the outer flap .

Images