JPS5922743A - Method of forming paper box - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of forming a paper box, and more particularly to a method of continuously forming a paper box from a long sheet of material.

Generally, corrugated sol boxes are used for packaging products such as sugar or salt in polyethylene bags, frozen fish, frozen products, etc. during storage or shipment. Generally, this type of corrugated beer box is constructed in a VCf configuration so that it can be assembled at the time of use if it is relatively large, or it is preformed into a box shape if it is small. Therefore, in the case of the former type, assembly during use is troublesome, and in the case of the latter type, a large space is required to accumulate empty boxes before packaging.

By the way, since the above-mentioned contents themselves have a fixed shape and pressure resistance, there is no need to pack them in extremely rigid boxes such as corrugated pole boxes.

Therefore, such contents are 150-20011/lr.
? Packing in a paper box made of paper of a certain quality is economical insofar as the paper box can be folded flat and can be efficiently stacked when empty and easily restored to the state in use.

However, conventionally, paper boxes made of this type of paper are made by cutting a blank in the unfolded state of the paper box from a large sheet of paper, folding the blank along predetermined folding lines, and assembling it into a box shape. It was formed by gluing the necessary parts together. In this conventional paper box forming method, even if a large number of blanks are cut at the same time from a large number of stacked papers, most of the forming work is done manually; It has been considered difficult to mass produce it.

Accordingly, it is an object of the present invention to provide a method for continuously forming paper boxes from elongated sheet material.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method of forming a paper box according to the present invention will be described in more detail below with reference to preferred embodiments shown in the accompanying drawings.

According to a method of forming a paper box in an embodiment of the present invention, first, both sides 12a and 12b of a long sheet material 10 as shown in FIG. Each side of the cylindrical body is folded inward in a V-shape to form gussets 13 and 14. This town part 13, 14
As long as it is formed as a result when the sheet material 10 is formed into a cylindrical body, it may be formed during the process of forming the cylindrical body or after it is formed into a cylindrical body.

The long sheet material 10 shown in FIG.
c, 14b, 14c are shown.

In this way, the long sheet material io is formed into a cylindrical body with gussets, but at this time, both sides 12a of the sheet material 10,
As a general rule, the overlapping part of the paper box 12b, that is, the body joining part, is not glued because it serves as the entrance or door of the paper box. However, when forming a paper box after the cylindrical body is made into a single body, if the body joining part opens, it may be difficult to form the paper box. A strip-shaped adhesive application section 15 is placed in advance at a position intersecting the planned cutting line 11 on the overlapping surfaces of both sides of the long sheet material and as shown in FIG. It is preferable to form

A long sheet material 10 is formed into a gusseted cylindrical body as seen diagonally above, and when the body joining part is glued and fixed before and after the planned cutting line 11, the cylindrical shape The body is cut along each planned cutting line 11 to form a single cylindrical body 16. One end of this single cylindrical body 16 is shown in FIG.

Referring to FIG. 2, the single cylindrical body 16 is then bent at the four corners of both ends along lines 13 b + 13 c *1.
4b, 14cK? A cut is made by a predetermined length t. The length t of this incision is, as shown in FIG. 3, a dimension shorter than L, where L is the depth of the gussets 13 and 14 (which is the depth when the height of the gussets 13 and 14 becomes a paper box). By making the above-mentioned incisions at the four corners of both ends of the single cylindrical body 160, the two ends have four flap-like pieces formed by the opposing gussets, the surfaces of the body-joining portions, and the surfaces opposite thereto. End pieces 17-20 are formed.

Then, the single cylindrical body 16 is held along a transverse line at a position L' which is far from the edge of the cutting depth t, and this line is used as a folding line to form the flag shape. As shown in FIG.
It is opened in a plane perpendicular to the plane where 6 is located.

Distance L' from the edge, which is the position of the folding line at this time
becomes t+1-L. That is, from the state shown in FIG. 2, the cut edge of each end piece 17.18 of the folded gusset 13.14 and the face of the body matching part and each end piece 19. In order to open the cut edge of 20 at a right angle at the end of the cut, the length tK of the end piece 20 is required.
The dimension is 1/2 of the height of the gusset. Therefore, L' is t+
Therefore, when each piece 19.20 is opened along the folded back line, the end pieces 17, 18 of the gussets 13, 14 will open accordingly. Triangular matching parts 21 and 22 are formed in the folded part and opened outward.

Among the opened end pieces 17 to 20, the gusset end pieces 17 and 18 are attached to the mating portion 2 as shown in FIG.
It is folded back so that it overlaps with 1.22. Then, as shown in FIGS. 4 and 5, the end piece 19 of the face of the gusset part 17. The transverse line 25 along . At this time, adhesives 28a, 28b are applied to the surface of the end piece 19 in corresponding areas overlapping the end pieces 17, 18 of the gusset in order to bond them together. Thereafter, the end piece 20 on the surface opposite to the surface on the body matching side is folded back, and as shown in FIG. 18 and the end piece 19 of the body joint portion bonded thereto. At this time, in order to bond the two, adhesive is applied to the surface of the end piece 20 in a U-shape as a corresponding adhesive surface, similarly to the case of the end piece 19. In this case, each adhesive application part 26, 28a, 28b of the end piece 19, 20 is applied to the entire surface in the lateral direction when the end pieces 17, (, 8) of the folded back gusset are long enough to overlap each other. It is formed over a period of time.

When all the end pieces of the cylindrical body 16 are pasted together in this way, the end piece 19 of the body joining part is then cut along the folded line, that is, the folded part 27. , and are separated as shown in FIG.

This forms two opposing flaps 29a, 29b at the separating edge of the end piece 19. Then, adhesive 33 is applied to the entire surface of the flap 29a in the lateral direction, which is continuous or connected to the barrel mating surface. after that,
Both these flaps 29a.

29b are both folded back toward the body joining part side along the truss break line 25 along the upper edge of the end piece of the gusset part. As a result, the edge of the body joint part is made into a double wall by adhering the flap 29a, and the other flap 29b is shaped as an end flap when the paper box is formed as shown in FIG. .

When both ends of the cylindrical body 16 are formed in this way, each end becomes a horizontal T-shape, and the vertical end surface is rotated 90 degrees so that the surface of the body joining part is in one plane. Folded. Such folding of both ends of the cylindrical body 16 may be performed when the end piece 19 of the body-joining portion is cut into two pieces as shown in FIG.

Note that, after the other flap 29b described above is folded, the body-joining portion is once opened and inserted inside the body-joining portion. This completes the paper box 3o. This folded paper box 3
One end of the 0 is shown in FIG. 7, but the opposite end is formed in exactly the same manner.

The paper box 3o, which is formed diagonally upward, emerges in a flat folded state when it is completed. When using this, open the body joint and press down firmly on the bottom wall.
A paper box 30 as shown in FIG. 8 is obtained. This paper box 3o
In order to easily understand which parts of the door 31a + 31b, for example, the bottom wall 32 and the flaps 29b at both ends correspond to which part in the process of manufacturing the long sheet material 10 and the paper box, 1 to 4 are given the same reference numerals for convenience.

According to the paper box forming method of this embodiment, it is possible to continuously form a gusseted cylindrical body from a long sheet material and to cut the gusseted cylindrical body into individual pieces. The body can form a folded paper box by simply opening the ends and folding it back, making it possible to form the paper box by machine and eliminating the need to fold it again after the paper box is completed. It has great effects, such as:

In particular, according to the paper box forming method of the present invention, the doors 31a, 3
The ends of 1b can be doubled to increase rigidity, and a part of the end piece of the body joining part is used for the end wall of the paper box and also forms the end flap, so there is no waste of material. It is very economical.

In addition, in each of the above examples, the paper that is the material of one paper box is 1
It is preferably about 50 to 2 ooi/-, but the method of the present invention is not limited thereto. In addition, although the term "paper box" is used in the above explanation, this is used for convenience, and depending on the purpose of the paper box, the inner or outer surface may be formed by appropriately combining waterproof paper, polyethylene, etc. It also includes. Furthermore, the method of the present invention is not limited to a single layer, but can also be formed in multiple layers depending on the application.

As explained above, according to the paper box manufacturing method of the present invention, paper boxes can be manufactured continuously from long sheet materials, and the forming process is extremely simple, making it suitable for mechanization. This makes it possible to mass-produce this type of paper box, and when the paper box is completed, it is folded and flat, making subsequent accumulation very easy. is double-walled to increase its rigidity,
In addition, this type of paper box can be formed with great savings in materials, and has many other effects.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing a long sheet material, Fig. 2 is a perspective view showing the end of a single gusseted cylindrical body, and Fig. 3 is a state in which the end of the cylindrical body is opened. FIG. 4 is a perspective view showing a state in which the end piece of the gusset is folded back, and FIG. FIG. 6 is a side view schematically showing one end of the cylindrical body, which is one step of the paper box forming method, and FIG. 7 is a cylindrical body folded by the uninvented paper box forming method. A perspective view showing the end of a completed paper box,
FIG. 8 is a perspective view showing the paper box in a state where it is freestanding from a folded state. DESCRIPTION OF SYMBOLS 10... Long sheet material, 11... Cutting line planned line, 12 a, 12 b... Side part, 13.14-'
Gusset part, 15... Adhesive application part, 16... Single cylindrical body, +7. +8... End piece of gusset part, 19... End piece of body matching part, 20... End piece, 21.22...
・Triangular joint part, 30-...Paper box, 31a,
3 l b-door, 29 a, 29 b...flap. Patent applicant: Showa Bag Manufacturing Co., Ltd. Fang Co., Ltd. 11! ! O 211 Figure 4 151! ! Spear 71! l Spear 8 Figure 90

Claims (1)

[Claims] The method involves overlapping both sides of a long sheet material to form a cylindrical body, and folding the sides of the cylindrical body to form a gusset; A cylindrical body with edges is cut at predetermined intervals to form a single cylindrical body, and the four corners at both ends of the cylindrical body are bent along the line to a length shorter than the height of the gusset. making cuts to form four end pieces at each end, holding the cylindrical body flat and folding a line across the cylindrical body inward from the end position of the cuts; As a result, each end piece of the face on the body matching side and the face opposite thereto are opened, and accordingly, the end piece of the gusset part is also folded back to form a triangular matching part and open outward. then folding the end piece of the gusset back so as to overlap the mating part, and then folding the end piece of the side mating side along a transverse line along the upper edge of the end piece of the gusset. Folding the gusset back along another transverse line spaced apart on the side of the gusset and pasting it to the end piece of the folded back gusset; Fold the end piece back over. Lay it on the end piece of the body-matching side that has already been folded back and adhered to a part of the end piece of the gusset, and paste it on the end piece and the end piece of the gusset. applying an adhesive between the folded back line on the end piece of the side of the body matching side and a transverse line along the upper edge of the end piece of the gusset; cutting the end piece along the folded back line in the end piece, and then cutting and separating the end piece of the face on the body mating side that is cut and separated so that the end piece appears on both sides. The paper box includes folding two flaps along a transverse line along the upper edge of the end piece of the gusset toward the body-matching side, and gluing the inner flap to the body-matching side. Formation method.