JPH0257016B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a paper box with a relatively simple structure.

Conventionally, paper boxes have been manufactured by cutting a piece of cardboard into a box shape, folding the cut paper along each crease line, and gluing it at the overlapping part to assemble it, or by cutting it into a box shape on either side of the overlapping part. In many cases, an insertion tongue piece is formed on the other side of the cut, and the tongue piece is inserted into the cut to assemble.

As mentioned above, boxes that are assembled by gluing at the overlapped parts have the advantage that there is little waste of material during cutting, and the assembly work can be mechanized and efficient, reducing production costs. It is widely used in various fields as a packaging box with a simple structure that is disposable.

By the way, in the case of this type of box that is assembled by gluing, if a fast-curing glue is used due to the properties of the glue, the adhesion will occur during the process of folding the cut paper using the inner and outer molds. The parts can be almost perfectly adhered, improving workability, but on the other hand, the working conditions from gluing to folding become stricter, and the entire device including the gluing mechanism becomes complicated. The fast curing glue used is relatively expensive and increases the cost of manufacturing the box.

On the other hand, unlike the above-mentioned fast-curing glue, using a slow-curing glue can simplify the equipment and the glue itself is cheap, which is advantageous in terms of box manufacturing costs. It takes a certain amount of time for the glue to completely harden and become stable, and the problem is that molding cannot be done on the production line during this time.

Furthermore, when using a slow-curing glue, when folding the unfolded cut paper using the inner and outer molds, the polymerized adhesive part is pressurized and remains in a pasted state for a while. The pressure is temporary, and after the inner mold is removed, the adhesive part is left under no pressure and the box moves with the outer mold, causing peeling of the adhesive part before the glue hardens and stabilizes. Even if this does not result in poor adhesion, there are also problems such as insufficient adhesion, resulting in variations in the product and deterioration in quality.

This invention has been made in view of the above points, and in manufacturing paper boxes using slow-curing glue, the adhesive is pressed again during the hardening of the glue to attach the paper box. The present invention aims to provide a paper box manufacturing method that enables the production of high-quality paper boxes with no variation in products by perfecting the packaging.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described with reference to the drawings, with reference to the manufacturing of an upwardly open box a as shown in FIG.

As shown in FIG.
consists of a rectangular bottom plate 2, side plates 4 and 5 connected to each side of the bottom plate 2 via a crease line 3, and glue margins attached to both ends of the opposing side plate 4 via a crease line 6. The piece 7 is arranged in a row.

FIG. 3 shows a production line, and pre-cut paper 1 is supplied to the production line and undergoes various processing while being moved intermittently.

That is, the cut paper 1 supplied on the production line is
First, the glue margin piece 7 is glued by a known method in the gluing section A, and then moved to the folding section B, where the cut paper 1 is removed under the downward movement of the inner mold 8. It is folded from each crease line 3, 6 by being pushed into a mold 9, and the glue allowance piece 7 is overlapped with the corresponding side plate end 5a and pasted by pressure by the inner and outer molds 8, 9.
A box a is assembled inside the outer mold 9.

Next, the inner mold 8 rises and is extracted from the outer mold 9,
The outer mold 9 is moved from the folding section B while holding the box a inside the outer mold, and the process moves to a step of curing the glue in the pasting section.

However, in this invention, a re-pressing section C is provided at an appropriate production line position where the box a is held by the outer mold 9 and the glue is in an uncured state during movement.
When box a reaches , pressurizing member 10 is placed inside the box.
is inserted, and the adhesive part is held and pressurized between it and the outer mold 9.

After this, the pressure member 10 is pulled out from the box a, and the box is moved again while being held by the outer mold 9 to allow the glue on the attached part to dry and harden naturally until it reaches a predetermined position, that is, the box removal position D. is moved to take out the box a from the outer mold 9.

As described above, when assembling a box using slow-curing glue, immediately after gluing the glue margin pieces of the cut paper in the unfolded state, the folds are formed using the inner and outer molds. In addition to applying pressure to the adhesive part at the same time as folding through the wire, the adhesive part is re-pressurized during the process of hardening the adhesive, so in the case of slow-curing adhesives, Immediately after applying the glue to the glue strip, pressure is applied at the same time as folding with the inner and outer molds.
Since the glue is soft and pressure is applied while it is attached to the surface of the adhesive part, the adhesive strength cannot be expected to be very strong. The adhesive has formed and is in the process of curing, and by applying pressure again at this stage, the adhesion strength is greatly improved and the adhesion becomes completely reliable, and the product obtained in this way is of consistent high quality. In addition, the production line can be implemented with only slight improvements to the conventional production line, and the box shape can be applied to a variety of other products.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a box obtained by the manufacturing method of the present invention, FIG. 2 is a developed view of the cut paper, and FIG. 3 is a process diagram of an embodiment of the present invention. 1...Cut paper, 2...Bottom plate, 3...Fold line, 4, 5...Side plate, 6...Fold line, 7...
Glue allowance piece, 8... Inner mold, 9... Outer mold, 10... Pressure member.

Claims (1)

[Claims] 1. A sheet of cardboard is cut in advance into an unfolded box shape, folded along each fold line, and glued and glued to the corresponding overlapping parts to assemble the paper box. After gluing the cut paper on the glue margin, use the inner and outer molds to fold the cut paper to form a box shape, pressurize the overlapped part, then remove the inner mold and hold the box with the outer mold. 1. A method for manufacturing a paper box, which comprises moving the paper box in a state in which the paper box is attached, and inserting a pressure member into the box while attempting to harden the glue on the polymerized adhesive part to apply pressure again on the polymerized adhesive part.