JPS61164822A - Manufacture of paper box for gift - 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 Field of the Invention The present invention relates to a method for manufacturing cardboard gift boxes with high mechanical strength for packaging relatively heavy items such as liquid-filled glass bottles. It's something like that.

Background of the Invention and Problems In order to manufacture a cardboard box with mechanical strength that exhibits a practically sufficient degree of rigidity when formed into a box shape, it is necessary to have a considerable thickness and a practically sufficient density. High quality cardboard is used. However, printing and grooving or creasing pose practical limitations. As a practical matter, it is no longer possible to perform offset printing on heavy-weight quality cardstock such as Soog and Yop, and similarly, it is no longer possible to perform offset printing on heavy-weight quality cardstock such as 600g and Yoshi. It is no longer possible to use conventional mechanical or radio frequency grooving or creasing methods. For cardboard with a grain size of 700 J, t, grooving or creasing can be done using the hammering method or corrugating method, but this technique is expensive. Also, embossing or creasing operations can probably only be done at low speeds.

To eliminate this drawback, a type of corrugated paper with fine corrugations was developed, but this paper is thinner and has higher mechanical strength than ordinary cardboard of the same thickness. These cardboards are probably also suitable for offset printing as well as for grooving or creasing by conventional techniques. However, these products often suffer from surface deformation which is very unacceptable when the appearance of the box is of high quality.

SUMMARY OF THE INVENTION The present invention provides a method for printing paperboard of such a thin quality that it can be offset printed and can also be grooved or creased by conventional high-speed mechanical or high-frequency methods. The object is to provide a method for manufacturing a gift box with very high mechanical strength and sufficient rigidity for practical use.

The method according to the invention enables the subsequent box forming process by selectively reinforcing only the parts of the fabric of the box that are not marked with folds or grooves. It consists of making sure that it remains on both sides.

Thereby, a thin cardboard box fabric which can be offset printed and which can be creasing or grooving by conventional methods and at high speed before reinforcing the fabric by the method according to the invention is obtained. It becomes possible to use If this reinforcement does not affect folding, the reinforced fabric can be easily formed into a box shape using conventional mechanical equipment.

According to a first embodiment of the method according to the invention, the above-mentioned portion of the fabric is arranged on top of it with a set of loose cut-outs of auxiliary material and positioned, the cut-outs being pre-grooved or creased. It is reinforced by adhering to the top using a high frequency adhesive process.

This auxiliary material may be a flexible or semi-rigid material such as a sheet of woven fabric, leather or plastic material, or a rigid material such as wood, cardboard, metal sheet or sheet of rigid plastic material. can be used.

According to another embodiment of the method according to the invention, the above-mentioned reinforcement is carried out by impregnating the cardboard fabric, which has previously been grooved or folded, with a curable and polymerizable resin, and in which the parts to be reinforced are This is done by subjecting the resin to a high frequency treatment which causes local polymerization and hardening of the resin.

According to its first application, it is necessary to impregnate only the parts of the cardboard fabric that are to be reinforced.

According to another example of its application, the entire surface of the cardboard fabric is impregnated and only the parts to be reinforced are subjected to the above-mentioned high-frequency treatment, which causes local polymerization and hardening of the impregnated resin. .

If possible, it is better to carry out reinforcement by using a combination of auxiliary materials and the impregnating method described above. In this case, adhesion of the auxiliary material and polymerization of the impregnated resin are carried out in a single high-frequency treatment. It is preferably comprised of a thermosetting resin, such as a combination of different resins.

Detailed description of the invention with reference to the drawings The invention will now be explained in more detail by way of example and with reference to the drawings.

FIG. 1 is a plan view of a pre-creased cardboard fabric treated by the method of the invention.

FIG. 2 is a conceptual perspective view of a radiofrequency treatment apparatus for carrying out one embodiment of the method according to the invention.

FIG. 3 is a conceptual perspective view of a radiofrequency treatment device for curing impregnated resin, used in accordance with another embodiment of the method according to the invention.

FIG. 1 shows a cardboard box fabric 1 that has been cut out and scored in a conventional manner to make a rectangular gift box. This fabric 1 has panels 2 to 5 for shaping the side, rear and front walls of the box. Each panel is divided by fold p lines 6 to 8, respectively.

Furthermore, these panels have a 7° 9° to 1° angle at their upper and lower ends to form the bottom and lid of the box.
I'm giving it a 5. These flaps are separated from the aforementioned panels 2 to 5 by fold lines 16 to 22, respectively. The flap 10 and the panel 5 are also provided with flaps 23 and 24, respectively, for closing the box.

This fabric 1 is made from s o o g, lighter weight cardboard so that it can be cut out by conventional methods and creases can be made by mechanical devices operating at high speed. ing. Furthermore, this thick strip can therefore also be printed by a fast and economical offset method.

In order to be able to make a box with very high mechanical strength from this fabric 1, the blank areas of the fold lines 6 to 8 and 16 to 22 of the panels 2 to 5 and of the flaps 9 to 15 are are the parts to be selectively reinforced by the method according to the invention. In the embodiment illustrated in FIG. 1, only the panels 2 to 5 and the flap 10 are reinforced, as indicated schematically at 25 to 29 in the figure.

In fact, it has been found that this type of reinforcement is sufficient to increase the mechanical strength of the finished box to the level of a monk. However, it is clear that it is also possible to reinforce the entire panel as well as the flap of the cardboard fabric 1.

According to a first embodiment of the method according to the invention, the reinforcement of parts 25 to 29 is achieved by positioning separate cut-outs of the auxiliary material and gluing these cut-outs onto the cardboard fabric 1 by means of a high-frequency gluing method. It is done by This kind of work is fast and economical and can be easily carried out by machines such as those described in French Patent Application No. 82 04579 of June 18, 1982 by the Applicant. According to the auxiliary material, any flexible, semi-rigid or even rigid material and which can be bonded to the cardboard fabric 1 by high-frequency bonding methods can be used. Any flexible material, such as woven fabric or leather, or semi-rigid or rigid material, such as cardboard, sheets of plastic material or metal sheets, are suitable for use.

In particular, the method according to the invention as well as the embodiment illustrated in FIG. This makes it possible to achieve considerable savings in material of up to 40% compared to the consumption of material used in existing methods of covering the entire surface of the surface with material. For example, when using leather, this is of considerable benefit. Figure 2 shows that cut-outs of auxiliary material are placed in the area to be reinforced, i.e. between 25 and 29 of the cardboard fabric shown in Figure 1. This conceptually shows a high-frequency adhesive device for bonding. This figure shows the upper plate 3 of a conventional high-frequency press.
0 is shown 0 This upper plate 30 has on its lower side a separate gluing device formed by a rectangular frame made of a piece of brass for each cut-out piece of auxiliary material to be glued. 31 to 35 are attached.

This method of gluing only the periphery of the cut-out pieces of auxiliary material has also proven to be sufficient to increase the mechanical strength of the finished box. Another implementation of the method according to the invention According to the example, sections 25 to 29 of the cardboard fabric 1 are reinforced by impregnating them with a thermosetting, polymerizable resin. These sections 25 to 29 are then subjected to a high frequency treatment which causes local polymerization and hardening of the resin infiltrated into the sections to be reinforced. For this purpose, resins are used which can be hardened by the action of high frequency treatment.

According to another embodiment of the method according to the invention, the entire surface of the cardboard fabric is impregnated with a thermosetting resin. Only the areas to be reinforced are then subjected to a high-frequency treatment, thus resulting in local polymerization and hardening of the resin, while the fold line or the projected area of the cutout is not affected by this treatment and is therefore mechanically Preferably, the resin used for this impregnation is
Thermosetting resins such as acrylic resins, urea resins, melamine resins, carbonic acid resins, or combinations of these resins are desirable. A high frequency instrument such as that shown in FIG. 3 is used when the catalyst used with these resins is applied to the cardboard fabric. The top plate 36 of a conventional high frequency press, which is not shown in detail in the figure, is clearly visible in this figure. On the upper plate 36, on its lower side, for each of the sections 25 to 29 in FIG. 1 to be reinforced,
Separate high frequency instruments 37 to 40 formed by divided rectangular frames are attached. Each frame includes a set of longitudinal edges 42 and lateral edges 43, respectively. In fact, it has been found that with a device of this type it is possible to polymerize and harden the resin impregnated in the portions 25 to 29 to be reinforced to a sufficient extent to realize a considerable increase in the stiffness of the cardboard fabric 1. ing.

According to one advantageous embodiment of the method according to the invention, selective reinforcement using cut-outs of auxiliary material and reinforcement by local impregnation and curing with resin are combined. In this case, the cardboard fabric 1 is first impregnated with an appropriate resin. Cutouts of reinforcing material are then placed in position and, in another step, a radiofrequency treatment is applied to bond the cutouts and locally harden the resin. This operation may, if preferred, be carried out in two steps and with one suitable high-frequency instrument.

This device may be of the type illustrated in FIG.

By suitably setting the high-frequency press K, adhesion of the cut-outs of the auxiliary material and polymerization and hardening of the resin soaked into the parts 25 to 29 to be reinforced are simultaneously carried out. The gluing of the cut-outs of the auxiliary material and the polymerization of the impregnated resin are two consecutive steps, which may be carried out in two different devices, as illustrated in FIGS. 2 and 3, respectively. .

The invention is obviously not limited only to the embodiments described and shown here, but can be adapted to many applications without departing from the scope of the invention.

[Brief explanation of drawings]

FIG. 1 is a plan view of a pre-creased cardboard fabric treated by the method of the invention; FIG. FIG. 2 is a conceptual perspective view of a processing instrument. FIG. 3 is a conceptual perspective view of a radiofrequency treatment device for curing impregnated resin, used in accordance with another embodiment of the method according to the invention. 1... Cardboard fabric, 2-5... Panel, 6
~8...Fold φ, 9~15...Flap,
16-22...Fold line, 23 and 24...Fold-in, 30...Top plate, 31-35...Adhesive device, 36...Top plate, 37-41...
High frequency instruments, 42 and 43...

Claims (9)

[Claims] (1) Pre-grooved or creased fabrics made of thin cardboard that can be printed by offset printing and that can be grooved or creased by conventional mechanical or high-frequency methods. A method of manufacturing a gift paper box having sufficient strength and rigidity for practical use, in such a way that unreinforced portions remain on either side of each groove or fold line to enable the subsequent box forming process, A method for producing a gift paper box, comprising selectively reinforcing portions of the fabric where the grooves or fold lines do not pass. (2) The method described in claim 1,
By positioning and arranging a set of loose cut-outs of the auxiliary material on the above-mentioned portion of the fabric and fixing the positioned cut-outs to the pre-grooved or creased fabric by means of high-frequency gluing. , a method characterized in that it consists of reinforcing a portion of the above-mentioned fabric. (3) The method described in claim 2,
A method characterized in that it consists in using as auxiliary material a flexible or semi-rigid material, such as a sheet of woven fabric, leather or plastic material. (4) The method described in claim 2,
A method characterized in that it consists in using as auxiliary material a rigid material such as wood, cardboard, a sheet of metal or a sheet of rigid plastic material. (5) Using the method described in any one of claims 1 to 4, a cardboard fabric that has been grooved or creased in advance is impregnated with a curable and polymerizable resin. and subjecting the part to be reinforced to a high-frequency treatment which causes local polymerization and hardening of the above-mentioned resin. (6) The method described in claim 5,
A method characterized in that it consists in impregnating only the part of the cardboard fabric that is to be reinforced. (7) The method described in claim 5,
A method characterized in that the entire surface of the cardboard fabric is impregnated and only the parts to be reinforced are subjected to the above-mentioned high-frequency treatment, thereby causing local polymerization and hardening of the impregnated resin. (8) Adhesion of cut-out pieces of auxiliary material by high frequency and localization of impregnated resin by the method described in any one of claims 2 and 5 to 7. A method characterized in that it consists of performing both high-frequency processing and high-frequency processing at the same time. (9) In the method described in either claim 5 or 8, the resin is an acrylic resin, a urea resin, a melamine resin, a carbonic acid resin, or a combination of these types of resins. A method characterized by: