JPH0589229U - Packaging box - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a packaging box in which cracks are less likely to occur on the surface of the paperboard constituting the packaging box by pressing and bending. The packaging box of the present invention has a stretchable sheet of paper, which is composed of a coated ball layer 2 and a craft ball layer 3, which are sequentially stretched from the outer surface of a blank plate A for assembling the same, through an adhesive 4 It is formed by appropriately cutting a paperboard formed by stacking 5 layers of high crepe paper. In addition, the crepe paper 5 and the direction orthogonal to the hinge line 9a formed on the blank plate A
The extension directions of the crepes are matched. Further, no cracks are formed on the edge portion 12a of the step portion 12 formed on the left and right side flaps 10c and 10d.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a packaging box, and more particularly to a packaging box in which cracks are unlikely to occur due to bending or pressing.

[0002]

[Prior Art]

 Recently, as shown in FIG. 5, in order to facilitate the loading and unloading of stored items, the lid body portion 8 connected to the box body portion 7 swings openably and closably via a fold line 31 serving as a hinge. The lid opening / closing type packaging box 30 or the side flap 41 at the bottom of the box body as shown in FIG. 6 is formed with a step portion 42 by pressing, and the thickness of the inner flap 43 is released so that the outer flap 44 can be released. As a form that does not create a gap, a moisture-proof or oil-proof leak-proof leakproof packaging box 40 or the like that can prevent the leak of powdery stored items is widely used.

[0003]

[Problems to be solved by the device]

However, the paperboard for assembling the packaging box as described above generally weighs 200 to 800 g per 1 m ² , and is made by a paper machine. Alternatively, it is formed by pasting paper that has been made. The elongation is about 2% in the longitudinal direction (the direction in which the stock is poured out during papermaking), and the elongation in the lateral direction is about 4 to 5%, which is a difference between the longitudinal direction and the lateral direction. Therefore, when a packaging box assembled using these paperboards is used, cracks are likely to occur in the bent portion orthogonal to the direction in which the paperboard elongation is low.

Therefore, in the lid opening / closing type packaging box 30 described above, when the lid 8 is repeatedly opened and closed, there is a problem that the fold line 31 serving as a hinge is damaged.

In addition, in the moisture-proof or oil-proof leak-proof packaging box 40, the inner surface is coated with a synthetic resin material, impregnated, or the like, but it is embossed (pressed). If the step portion 42 forms a large stretch in a direction corresponding to the longitudinal direction during papermaking of the paperboard, a crack is generated at the edge portion 42a of the step portion 42, and there is a problem that moisture resistance and oil resistance are impaired.

Therefore, an object of the present invention is to provide a packaging box in which cracks are unlikely to occur on the surface of the paperboard constituting the packaging box by bending or pressing in order to solve the above problems.

[0007]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the present invention is formed by a paperboard in which a paper layer having high extensibility and a paper layer having low extensibility are laminated, and at least one of the inner surface and the outer surface has extensibility. It adopted a structure with a high paper layer.

A packaging box having a highly stretchable paper layer on its inner surface is preferable.

Further, a box wall plate of a packaging box provided with a hinge portion or a step portion can be mentioned. Then, a packaging box in which the direction of high extensibility of the paper layer of high extensibility coincides with the direction orthogonal to the ruled line of the hinge part is preferable.

[0010]

[Action]

 The packaging box according to the present invention having the above-mentioned configuration is the most stretched packaging box when the hinge portion provided on the box wall plate is repeatedly bent or the step portion is formed by pressing. The high elongation of the highly extensible paper layer on the outer surface compensates for the required elongation in the machine or transverse direction.

[0011]

【Example】

A packaging box according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a state in which the blank plate A of the packaging box 1 is viewed from the back surface side, and from the outer surface side thereof, the coat ball layer 2, the craft ball layer 3, the adhesive layer 4, and the highly stretchable crepe paper 5 It is formed by appropriately cutting paperboard in which the above are sequentially laminated. The paper layer consisting of the coated ball layer 2 and the kraft ball layer 3 is a multi-layered paper layer that has been laminated with a paper machine. The stretching direction is made to coincide with each other, and the direction indicated by the arrow in the drawing is the longitudinal direction of the crepe paper 5 when the paper layer having low extensibility is formed. Note The various material conditions that make up the blank plate A, for example, coated cardboard layer 2 is 400-600 g / m ² basis weight that indicates the weight of the 1 m ² per basis weight kraft ball layer 3 is 60 to 10 0 g / m ² is suitable. Further, low-density polyethylene (LDPE) can be used for the adhesive layer 4, and its thickness is preferably 20 to 40 μm. Next, the crepe paper 5 may be a general one obtained by peeling a wet paper wound around a dryer roll of a paper machine with a doctor, and an elongation of about 10% is preferable. On the other hand, a part of the dryer roll of the paper machine was equipped with a device that crimps and rotates an endless thick rubber belt through a nip roll, inserts wet paper between the dryer roll and the belt, and stretches it in advance. Kurpack paper, which is obtained by shrinking the paper by utilizing the shrinkage of the belt, can also be used as a highly stretchable paper layer.

Further, the blank plate A is assembled into a packaging box 1 as shown in FIG. 2, and a large number of fold lines 6 for partitioning each box wall plate are formed from the outer surface by embossing (pressing). Of the folds 6, the box body portion 7 and the lid body portion 8 which are openably and closably connected form the hinge portion ruled line 9a of the hinge portion 9.

Further, as shown in FIGS. 1 and 3, the bottom of the packaging box 1 is composed of an inner flap 10a, an outer flap 10b, left and right side flaps 10c and 10d, and notches at both left and right corners of the inner flap 10a. 11 is formed, and a step portion 12 is formed corresponding to the cutout portion 11 so that the thickness of the left and right side surface flaps 10c and 10d is released when the inner flap 10a is overlapped. The left and right side flaps 10c and 10d, the inner flap 10a, and the outer flap 10b thus formed are folded and adhered in this order, and the bottom is sealed and stored so that there is no gap. The structure is such that the stored items do not leak.

In the packaging box 1 configured as described above, the crepe extending direction of the crepe paper 5 provided on the inner surface is made to coincide with the direction orthogonal to the hinge part ruled line 9a of the hinge part 9. When the part 9 is repeatedly bent, the stretchability of the crepe paper 5 reduces bending fatigue and makes it less likely to break. In addition, the edge 12a of the stepped portion 12 formed by embossing (pressing) does not crack, and in the case of a resin-coated moisture-proof or oil-proof packaging box, the moisture-proof and oil-proof properties deteriorate due to cracks. There is no. By the way, as a method for imparting moisture resistance or oil resistance, for example, vinylden chloride resin is coated for imparting moisture resistance, and fluororesin is applied for imparting oil resistance.

Next, FIG. 4 shows a packaging box 20 for detergent which is capable of holding the measuring spoon S. This packaging box 20 is a double-structured box body in which an inner box 22 is fitted inside an outer box 21, and a pair of cut-and-raised tongue pieces 23 are rocked on the side plates 21a of the outer box 21 so as to swing in a double-door manner. The spoon S is sandwiched between the side plate 21a and the tongue piece 23. At this time, the box body is configured so as to match the extending direction of the crepe of the crepe paper attached to the inner surface of the outer box 21 in the direction orthogonal to the hinge part ruled line 24a of the hinge part 24 for swinging the tongue piece 23. It was confirmed that the bending resistance of the hinge line 24a of the tongue piece 23, which swings each time the spoon S is attached and detached, is improved.

[0016]

[Effect of the device]

 As described above, the present invention laminates a paper layer with high extensibility and a paper layer with low extensibility so that the paper layer with low extensibility maintains strength, size, and stability, and Since the elongation of the paperboard is compensated for by the elongation of the high paper layer, the packaging box assembled by this paperboard has a good practical effect in that it does not crack when bent or pressed.

[Brief description of drawings]

FIG. 1 is a plan view of a blank plate of an example.

FIG. 2 is a perspective view of the above-mentioned assembled state.

FIG. 3 is a perspective view showing an assembled state of the above bottom portion.

FIG. 4 is a perspective view of a packaging box holding a spoon.

FIG. 5 is a perspective view of a conventional lid opening / closing type packaging box.

FIG. 6 is a perspective view of a main part of a conventional leakproof packaging box.

[Explanation of symbols]

 1 packaging box 2 coated ball layer (paper layer with low stretchability) 3 craft ball layer (paper layer with low stretchability) 4 adhesive layer 5 crepe paper (paper layer with high stretchability) 6 crease line 7 boxes Body part 8 Lid part 9 Hinge part 9a Hinge part ruled line 12 Step part 20 Packaging box that holds spoon 21 Outer box 22 Inner box 23 Cut and raised tongue piece 24 Tongue hinge part 24a Tongue hinge part ruled line A Blank Board S spoon

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Michiaki Fujita 2-9-6-203 Fujisaki, Narashino (72) Inventor Seimei Takahata 26, 4274 Iwai, Iwai City (72) Inventor Keizo Matsushita Chiyoda, Tokyo 1-7-1, Saiwaicho in the ward Rengo Co., Ltd. Tokyo head office

Claims (5)

[Scope of utility model registration request] 1. A paperboard laminated with a paper layer having high extensibility and a paper layer having low extensibility, wherein a paper layer having high extensibility is provided on at least one of an inner surface and an outer surface. Packaging box. 2. The packaging box according to claim 1, wherein the inner surface is provided with a highly stretchable paper layer. 3. The packaging box according to claim 1, further comprising a hinge portion for swinging the box wall plate. 4. The packaging box according to claim 1, wherein a step portion is provided on the surface of the box wall plate by pressing. 5. The packaging box according to claim 3, wherein the highly extensible direction of the highly extensible paper layer is aligned with the direction orthogonal to the hinge ruled line.