WO2006054875A1

WO2006054875A1 - A packaging box and the folding method of the packaging box

Info

Publication number: WO2006054875A1
Application number: PCT/KR2005/003913
Authority: WO
Inventors: Sang-Gwon Moon
Original assignee: Cj Corp.
Priority date: 2004-11-19
Filing date: 2005-11-18
Publication date: 2006-05-26
Also published as: KR100638453B1; KR20060055899A

Abstract

Disclosed is a packaging box having a left wall face (21), a right wall face (23), a front wall face (22), a rear wall face (24) and a joining part (50) which are divided by vertical ruled lines (70), including a lower left wall flap (41) connected to a side to the left wall face (21), an inner left wall face (31) connected to the opposite side of the left wall face (21) and folded inward at an angle of 180 degrees, a lower right wall flap (43) connected to a side of the right wall face (23), an inner right wall face (33) connected to the opposite side of the right wall face (23) and folded inward at an angle of 180 degrees, an upper front wall flap (32) connected to the front wall face (22) to form an upper face of a box, an inner front wall face (42) connected to the opposite side of the front wall face (22) to form a twofold wall be being folded inward at an angle of 180 degrees, an upper rear wall flap (34) connected to the rear wall face (24) to form the upper face of the box, and an inner rear wall face (44) connected to the opposite side of the rear wall face (24) to form a twofold wall by being folded inward at an angle of 180 degrees. According to the present invention, the packaging box has the enhanced compression and bursting strength.

Description

APACKAGINGBOXANDTHEFOLDINGMETHODOFTHE

PACKAGING BOX

Technical Field

The present invention relates to a packaging box used for packaging goods to distribute and pile the goods. More particularly, the present invention relates to a packaging box having the enhanced compression and bursting strength, and a method of assembling the packaging box.

Background Art

With the development of industries, consumer's need and demand are escalated.

As a result, a variety of kinds of goods is produced. Further, there are also goods sensitive to a shock. Accordingly, packaging boxes are getting more important to protect the goods, particularly the goods sensitive to a shock, when distributing and piling the goods. FIG. 1 illustrates a development figure of a conventional packaging box (1).

The development figure of the packaging box (1) comprises a left wall face (2a), a front wall face (2b), a right wall face (2c), a rear wall face (2d) and a joining part (7), which are arranged in order from the left to the right in the figure. The development figure of the packaging box (1) further includes upper inner wings (3a) and (3b), lower inner wings (5a) and (5b), upper outer wings (4a) and (4b), and lower outer wings (6a) and (6b).

Borders between the left wall face (2a), the front wall (2b), the right wall face (2c) and the rear wall face (2d) are ruled with vertical lines (8b) and borders between a set of the left wall face (2a), the front wall face (2b), the right wall face (2c) and the rear wall face (2d) and a set of the upper and lower inner wings and the upper and lower outer wings are ruled with horizontal lines (8a).

The left wall face (2a) is adjacent to the upper inner wing (3a) and the lower inner wing (5a) at its upper side and lower side, respectively. The front wall face (2b) is adjacent to the upper outer wing (4a) and the lower outer wing (6a) at its upper side and lower side, respectively. The right wall face (2c) is adjacent to the upper inner wing (3b) and the lower inner wing (5b) at its upper side and lower side, respectively. The rear wall face (2d) is adjacent to the upper outer wing (4b) and the lower outer wing (6b) at its upper side and lower side, respectively.

FIG. 2 illustrates the status in which the conventional packaging box (1) shown in FIG. 1 is assembled. The jointing part (7) is glued to the left wall face (2a) and borders of the faces (2a), (2b), (2c) and (2d) are folded along the ruled lines, thereby to form a rectangular parallelepiped. In order to close a lower end of the rectangular parallelepiped, both the lower inner wings (5a) and (5b) are folded at an angle of 90 degrees, and then both the lower outer wings (6a) and (6b) are also folded at an angle of 90 degrees, so that the lower outer wings (6a) and (6b) are in close contact with the lower inner wings (5a) and (5b). Then, a tape (9) is applied to the outer surfaces of edges of the lower outer wings (6a) and (6b), thereby to close the lower end of the box. After closing the lower end of the box, goods (not shown) are put into the box and then an upper end of the box is closed.

In order to close the upper end of the box, first, the upper inner wings (3 a) and (3b) are folded at an angle of 90 degrees and the upper outer wings (4a) and (4b) are folded at an angle of 90 degrees. Next, a tape (9) is applied to the outer surfaces of edges of the upper outer wings (4a) and (4b), thereby to close the upper end portion of the box.

Currently, a typical distribution box is made of corrugated cardboard. There are a plurality of kinds corrugated cardboards, such as a double-sided corrugated cardboard, a double-layered double-sided corrugated cardboard, a triple-layered double- sided corrugated cardboard, and etc. The kinds of the corrugated cardboard used for the distribution box may vary depending on the goods to be packaged in the distribution box.

The distribution box must have enough compression strength because the boxes are generally used in the stats in which they are stacked in the vertical direction for high load efficiency when protecting, storing and transporting the goods. Further, the distribution box must have enough bursting strength not to burst by an external shock applied to the box.

Almost all of the distribution boxes used currently is produced in an automatic production line in order to reduce the production cost. Further, generally the produced boxes are also assembled in an automatic assembly line when packaging goods. The typical boxes currently used are A-I type boxes shown in FIG. 1 and 2. In general distribution boxes except for a packaging box without upper flaps, which is for specific use, the strength of the box is enhanced by increasing basis weight of material paper of the corrugated cardboard, adjusting the content of pulp in the material paper for corrugated cardboard or treating the material paper with chemicals in the case in which the box with high compression and bursting strength is needed to protect or store heavy goods or goods requiring the careful protection.

However, such a conventional box has the following problem. First, increase of the strength the box accompanies the cost increase. Second, productivity decreases as the corrugated cardboard becomes thicker because the thick paper makes assembly of the box be difficult. Third, distribution cost increases because the weight of the box increases.

Disclosure of Invention

Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a packaging box in which compression and bursting strengths are enhanced due to a twofold wall.

In order to achieve the above object, according to one aspect of the present invention, there is provided a packaging box including a lower left wall flap connected to a side of a left wall face to form a bottom face of a box, an inner left wall face connected to the opposite side of the left wall face to form a twofold wall by being folded inward at an angle of 180 degrees, a lower right wall flap connected to a side of a right wall face to form a bottom face of the box, an inner right wall face connected to the opposite side of the right wall face to form a twofold wall by being folded inward at an angle of 180 degrees, an upper front wall flap connected to a side of a front wall to form an upper face of the box, an inner front wall face connected to the opposite side of the front wall face to form a twofold wall by being folded inward at an angle of 180 degrees, an upper rear wall flap connected to a side of a rear wall face to form an upper face of the box, and an inner rear wall face connected to the opposite side of the rear wall face to form a twofold wall by being folded inward at an angle of 180 degrees. With reference to figures, the present invention is described in detail. FIG. 3 illustrates a development figure of a packaging box according to one embodiment of the present invention. FIGS. 4 to 10 are perspective views illustrating a method of assembling the packaging box shown in FIG. 3. FIG. 11 illustrates a packaging box according to another embodiment of the present invention. In order to achieve the object of the present invention, there is provided a packaging box including a left wall face (21), a right wall face (23), a front wall face (22), a rear wall face (24) and a joining part (50) which are divided by vertical ruled lines (70), and further including a lower left wall flap (41) connected to a side to the left wall face (21), ari inner left wall face (31) connected to the opposite side of the left wall face (21) and folded inward at an angle of 180 degrees, a lower right wall flap (43) connected to a side of the right wall face (23), an inner right wall face (33) connected to the opposite side of the right wall face (23) and folded inward at an angle of 180 degrees, an upper front wall flap (32) connected to the front wall face (22) to form an upper face of a box, an inner front wall face (42) connected to the opposite side of the front wall face (22) to form a twofold wall be being folded inward at an angle of 180 degrees, an upper rear wall flap (34) connected to the rear wall face (24) to form the upper face of the box, and an inner rear wall face (44) connected to the opposite side of the rear wall face (24) to form a twofold wall by being folded inward at an angle of 180 degrees.

Hereinafter, the packaging box according to the embodiment of the present will be described in detail.

FIG. 3 illustrates a development figure of a packaging box according to one embodiment of the present invention. The packaging box comprises a joining part (50), a left wall face (21), a front wall face (22), a right wall face (23) and a rear wall face (24) which are arranged in series from the left to the right in the figure, in which borders of the wall (21), (22), (23) and (24) and the joining part (50) are divided by vertical ruled lines (70). The left wall face (21) is connected to an inner left wall face (31) with an assembly projection (31') and a lower left wall flap (41), at its upper side and a lower side, respectively, having horizontal ruled lines (60) at a borders. The front wall face (22) is connected to an upper front wall flap (32) and an inner front wall face (42) with an assembly groove (42') at its upper side and lower side, respectively, having horizontal ruled lines (60) at borders. The right wall face (23) is connected to an inner left wall face (33) with an assembly projection (33') and a lower right wall flap (32), at its upper and lower sides, respectively, having horizontal ruled lines (60) at borders. The rear wall face (24) is connected to an upper rear wall flap (34) and an inner rear wall face (44) with an assembly groove (44') at its upper and lower sides, respectively, having horizontal ruled lines (60) at borders.

Referring to FIG. 4, in order to form four side walls of the packaging box, the development figure is folded along the vertical ruled lines (70) and the joining part (50) extending from the left wall face (21) is fixed to the rear wall face (24) using glue, resulting in a rectangular parallelepiped with opening at both ends.

Referring to FIG. 5, the rectangular parallelepiped figure of the packaging box (100) is up side down in order to close a lower end of the box.

Referring to FIG. 6, in order to form twofold front and rear walls of the packaging box, the inner front wall face (42) extending from the front wall face (22) is folded inward along the horizontal ruled line (60) at an angle of 180 degrees, so that inner surfaces of the front wall face (22) and the inner front wall face (42) abuts each other. Referring to an enlarged view A in FIG. 6, in which the enlarged view A illustrates a sectional view of the front wall of the packaging box, the front wall of the packaging box has the twofold wall structure formed by the front wall face (22) and the inner front wall face (42).

The term "inward" means the direction toward an inner space of the packaging box (100), in which goods would be put. The "folded at an angle of 180 degrees" means that the inner front wall face

(42) extending from the front wall face (22) is folded along the horizontal ruled line (60) such that the inner front wall face (42) is in close contact with and parallel with the front wall face (22) as shown in a partially enlarged view A.

Referring to FIG. 7, the lower left wall flap (41) and the lower right wall flap (43) are folded inward at an angle of 90 degrees such that edges of the flaps (41) and

(43) are met to each other, and a tape (80) is applied to around the edges of the lower left flap (41) and the lower right flap (43) in order to close the lower end of the box.

The "folded at an angle of 90 degrees" means that the lower left flap (41) is folded inward at the right angle along the horizontal ruled line (60) at the border between the lower left wall flap (41) and the left wall face (21) as the left wall face (21) is perpendicular to the lower left wall flap (41).

Referring to FIG. 8, in order to close an upper end portion of the box, the packaging box (100) is up side down from the status shown in FIG. 7, so that the opening of the upper end portion of the box faces upward. Referring to FIG. 9, in order to form twofold left and right side walls of the packaging box, the inner left wall face (31) and the inner right wall face (33) are folded inward at an angle of 180 degrees.

As shown in a partially enlarged cross sectional view, the inner left wall face (31) is inside the packaging box and is in parallel with the left wall face (21), thereby forming the two fold left side wall of the packaging box. The inner right wall face (33) exists in the box as it is in parallel with the right wall face (23).

When folding the inner left wall face (31) and the inner right wall face (33) inward, the assembly projections (31') and (33') are engaged with the assembly grooves (42') and (44') respectively, thereby keeping the inner left wall face (31) and the inner right wall face (33) folded.

Referring to FIG. 10, in order to complete the closing of the upper end of the packaging box, the upper front wall flap (32) and the upper rear wall flap (34) are folded inward at an angle of 90 degrees such that edges thereof are met at the center of the box, and a tape (80) is applied to the edges of the flaps (32) and (34).

The packaging box (100) has a left wall (21), a front wall (22), a right wall (23) and a rear wall (24), each having a twofold wall structure.

FIG. 11 illustrates a packaging box according to another embodiment of the present invention. In the packaging box (100) shown in FIG. 11, the front and rear walls are assembled to have the twofold wall structure by the process steps shown in FIGS. 3 to 7.

The front wall face (22) and the inner front wall face (42) are in close contact with each other, and the rear wall face (24) and the inner real wall face (44) are in close contact with each other. The inner front wall face (42) is folded inward at an angle of 180 degrees and the inner rear wall face (44) is folded inward at an angle of 180 degrees, thereby to form the twofold structure.

As described above, in the status in which the front and rear walls of the box has the twofold structure, the upper front wall flap (32) and the upper rear wall flap (34) are folded inward at an angle of 180 degrees, thereby forming front and rear walls having a threefold structure. According to this embodiment, the front wall of the packaging box has a threefold structure inclusive of the front wall face (22), the inner front wall face (42) and the upper front wall flap (32) which are in order from the inside to the outside of the box. The rear wall of the packaging box also has the threefold structure inclusive of the rear wall face (24), the inner rear wall face (44) and the upper rear wall flap (34).

In order to close an upper end of the box, the inner left wall face (31) and the inner right wall face are folded inward, a tape (80) is applied to edges of the inner left and right wall faces (31) and (33). According to this embodiment, each of the left and right walls of the packaging box comprises one sheet of board but each of the front and rear walls comprises three sheets of boards.

According to further another embodiment of the present invention, a lower end portion of the packaging box (100) is closed in the conventional way, and the upper front wall flap (32) and the upper rear wall flap (34) are folded inward to form a twofold wall. Next, the inner left wall face 31 and the inner right wall face (33) are folded inward, and then a tape (80) is applied to edges of the inner left and right wall faces (31) and (33).

In the box according to the present embodiment, each of the left and right walls of the packaging box (100) comprises one sheet of board but each of the front and rear walls comprises two sheets of boards. That is, the front and rear walls have the twofold structure. Brief Description of Drawings

FIG. 1 is a development figure of a conventional packaging box;

FIG. 2 is a perspective view of the assembled packaging box shown in FIG. 1;

FIG. 3 is a development figure of a packaging box according to one embodiment of the present invention;

FIGS. 4 to 10 are perspective views illustrating a method of assembling the packaging box shown in FIG. 3; and

FIG. 11 is a perspective illustrating a packaging box according to another embodiment of the present invention. < Description of symbols about principle part of Drawings >

21 : left wall face 22 : front wall face

23 : right wall face 24 : rear wall face

31 : inner left wall face 31', 33' : assembly projection

32 : upper front wall face flap 33 : inner right wall face 34 : upper rear wall face flap 41 : lower left wall face flap

42 : inner front wall face 42', 44' : assembly groove

43 : lower right wall face flap 44 : inner rear wall face 50 : joining part 100 : packaging box

Best Mode of Carrying Out the Invention

A method of assembling a packaging box (100) will be described below. A method of assembling a packaging box (100) according to one embodiment of the present invention comprises a first step of forming a twofold wall by folding inward the inner front and rear wall faces (42) and (44), which are facing each other, at an angle of 180 degrees, a second step of folding inward the lower left and right wall flaps (41) and (43), which are facing each other, at an angle of 90 degrees, a third step of forming a twofold wall by folding inward the inner left and right wall faces (31) and (33), which are facing each other, at an angle of 180 degrees, and a fourth step of folding inward the upper front and rear wall flaps (32) and (34), which are facing each other, at an angle of 90 degrees.

A method of assembling a packaging box (100), according to another embodiment of the present invention, comprises a first step and a second step which are the same as the first and second steps of the embodiment above, respectively. The method according to the present embodiment further includes a third step of forming threefold front and rear walls by folding inward the upper front and rear wall flaps (32) and (34), which are facing each other, respectively at an angle of 180 degrees, and a fourth step of folding inward the inner left and right wall faces (31) and (33), which are facing each other, at an angle of 90 degrees, thereby to close an upper end portion of the packaging box (100).

A method of assembling a packaging box (100), according to further another embodiment of the present invention, includes a first step of folding inward the lower left and right wall flaps (41) and (43) and the inner front and rear wall faces (42) and (44) at an angle of 90 degrees in order to close a lower end portion of a box, a second step of forming a twofold wall by folding the upper front and rear wall flaps (32) and (34) at an angle of 180 degrees, and a third step of folding inward the inner left and right side wall faces at an angle of 90 degrees, thereby to close an upper end portion of the box. A method of assembling a packaging box (100), according to still further another embodiment of the present invention, includes a first step of folding inward the inner front and rear wall faces (42) and (44), and the lower left and right wall flaps (41) and (43) at an angle of 90 degrees in order to close a lower end portion of a box, a second step of forming a twofold wall by folding inward the inner left and right wall faces at an angle of 180 degrees, and a third step of folding the upper front and rear wall flaps (32) and (34) in order to close an upper end portion of the box.

Packaging box samples according to the present invention are prepared, and their compression and bursting strengths are tested. The test result will be described below.

General corrugated cardboards used for making a box are A-flute, B-flute, E- flute double-sided corrugated cardboards, AB-flute double-layered double-sided corrugated cardboard, and AAA-flute triple-layered double-sided corrugated cardboard as shown in table 1.

[Table 1 ]

Double-sided 1. A-flute corrugated cardboard currugated - flute height : 4.6 to 4.8mm cardboard - number of flutes : 34±2/30cm

2. B-flute currugated cardboard

- flute height : 2.5 to 2.8mm

- number of flutes : 50±2/30cm

3. E-flute currugated cardboard

- flute height : 1.0 to 1.2mm

- number of flutes : 93±2/30cm

Double-layered double-sided 4. AB-flute double-layered double-sided

cardboard currugated cardboard Triple-layered double-sided 5. AAA-flute triple-layered double-sided cardboard currugated cardboard

Table 2 shows the test result in the case in which two times height of the box is greater than width of the box, table 3 shows the test result in the case in which two times height of the box equals width of the box, table 4 shows the test result in the case in which two times height of the box is less than width of the box, and table 5 shows strength of each box tested.

Generally, a conventional A-flute(SW) box is inferior to a conventional AB- flute DW box in compression and bursting strength. However, with reference to tables 2 to 5, in the case of M-I -type boxes according to the present invention, an A-flute box is highly superior to an AB-flute box in the compression strength and the bursting strength. Particularly, the test results show that the boxes made of paper with relatively high strength, SK180/K180/SK180, have the substantially same compression strength as the boxes made of paper with relatively low strength, SK180/S120/SK180 when the boxes are the same M-I -type structure. For reference, each of SKl 80, Kl 80, B 160 and S 120 means a name of paper used for making a box, in which an alphabet in the name denotes a kind of paper and a

number in the name denotes a basis weight of paper, that is weight of paper per nf .

Accordingly, as the number is higher, the strength of paper is superior. The alphabet SK, B, S and K are not given according to KS standard.

[Table 2]

Notes: L(length), W(width), H(height), S.C.S(sum of crush endurance strength.), C.S(crush endurance strength), B.S(burst endurance strength)

[Table 3]

[Table 4]

[Table 5]

Although preferred embodiments of the present invention have been described for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claim.

Industrial Applicability

The packaging box according to the present invention has the following advantages by using a thin corrugated cardboard to increase compression and bursting strength.

First, the packaging box can be made to have the enhanced strength with relatively low cost increase.

Second, since the box has a twofold wall, it is possible to inhibit decrease of strength of the box due to moisture when the box is used to package refrigerated or frozen goods or in high humid environment such as summer.

Claims

1. A packaging box having a left wall face (21), a right wall face (23), a front wall face (22), and a rear wall face(24) which, constitute four side walls of a box, and a joining part (50) which are divided by vertical ruled lines (70), in which the joining part (50) is fixed to any one of the wall faces to form a square prism figure when assembling the packaging box, an lower left wall flap (41) connected to a side of the left wall face (21) to form a bottom face of the box, and an inner left wall face (31) connected to the opposite side of the left wall face (21) and folded inward at an angle of 180 degrees to form a twofold wall; a lower right wall flap (43) connected to a side of the right wall face (23) to form the bottom face of the box, and an inner right wall face (33) connected to the opposite side of the right wall face (23) and folded inward at an angle of 180 degrees to form a twofold wall; an upper front wall flap (32) connected to a side of the front wall face (22) to form a top face of the box, and an inner front wall face (42) connected to the opposite side of the front wall face (22) and folded inward at an angle of 180 degrees to form a twofold wall; and an upper rear wall flap (34) connected to a side of the rear wall face (24) to form the top face of the box, and an inner rear wall face (44) connected to the opposite side of the rear wall face (24) and folded inward at an angle of 180 degrees to form a twofold wall.

2. The packaging box as set forth in claim 1, wherein each of the inner left wall face (31) and the inner right wall face (44) has assembly projections (31 ')(33') at its

both sides, respectively.

3. The packaging box as set forth in claim 1, wherein each of the inner front

wall face (42) and the inner rear wall face (44) has assembly grooves (42')(44')

corresponding to the assembly projections (31')(33') at its both sides, respectively.

4. A method of assembling a packaging box, comprising: a first step of forming a twofold wall by folding inward an inner front wall face (42) and an inner rear wall face (44), which are facing each other, at an angle of 180 degrees; a second step of folding inward a lower left wall flap (41) and a lower right wall flap (43), which are facing each other, at an angle of 90 degrees; a third step of forming a twofold wall by folding inward an inner left wall face (31) and an inner right wall face (33), which are facing each other, at an angle of 180 degrees; and a fourth step of folding inward an upper front wall flap (32) and an upper rear wall flap (34), which are facing each other, at an angle of 90 degrees.

5. A method of assembling a packaging box, comprising: a first step of forming a twofold wall by folding inward an inner front wall face (42) and an inner rear wall face (44), which are facing each other, at an angle of 180 degrees; a second step of folding inward a lower left wall flap (41) and a lower right wall flap (43), which are facing each other, at an angle of 90 degrees in order to close a lower end portion of a box; a third step of forming a threefold wall by folding inward an upper front wall flap (32) and an upper rear wall flap (34), which are facing each other, at an angle of 180 degrees; and a fourth step of folding inward an inner left wall face (31) and an inner right wall face (33), which are facing each other, at an angle of 90 degrees in order to close an upper end portion of the box.

6. A method of assembling a packaging box, comprising: a first step of folding inward inner front (42) and rear wall faces (44) and lower left (41) and right wall flaps (43) at an angle of 90 degrees in order to close a lower end of the packaging box (100); a second step of forming a twofold wall by folding inward an upper front wall flap (32) and an upper rear wall flap (34) at an angle of 180 degrees; and a third step of folding inward an inner left wall face and an inner right wall face at an angle of 90 degrees in order to close an upper end of the packaging box.

7. A method of assembling a packaging box, comprising: a first step of folding inward an inner front wall face (42), an inner rear wall face (44), a lower left wall flap (41) and a lower right wall flap (43) at an angle of 90 degrees in order to close a lower end of a packaging box (100); a second step of forming a twofold wall by folding inward an inner left wall face and an inner right wall face at an angle of 180 degrees; and a third step of folding inward an upper front wall flap (32) and an upper rear wall flap (34) at an angle of 90 degrees in order to close an upper end of the packaging box.