JPH0780972A - Production of waterproof corrugated cardboard - Google Patents

Abstract

PURPOSE:To shorten a process by dispensing with the sizing process among two waterproofing and bonding processes by bonding a heatmeltable synthetic film to the rear surface of a liner and heating the liner and a core in a surface contact state to melt the resin film to bond the liner and the apexes of the corrugations of the core. CONSTITUTION:Heat-meltable synthetic resin films 6, 6a are bonded to the rear surfaces of liners 4, 5 or a core 2. The liners 4, 5 and the core 2 are brought to surface contact state and heated to melt the synthetic resin films 6, 6a to bond the liners 4, 5 to the apexes 3, 3a... of the corrugations of the core 2. The waterproof corrugated cardboard thus produced is made waterproof and water-resistant by the synthetic resin films 6, 6a bonded to the core 2 and the liners 4, 5 and, at the bonding points 7, 7a of the apexes 3, 3a... of the corrugations of the core 2 and the liners 4, 5, the synthetic resin films 6, 6a are partially bonded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof corrugated board manufacturing method for manufacturing a waterproof corrugated board having a new structure in a simple process.

[0002]

2. Description of the Related Art Conventionally, a waterproof corrugated board manufacturing method requires two steps, a waterproofing step and an adhering step. One of the two waterproofing steps involves applying a water resistant chemical to a corrugated board, a liner or a core. This is a process of spray coating or roller coating of paraffin wax, etc. In contrast to such waterproofing process, the adhesive process is to apply starch paste on the tops of the cores at regular intervals, and to collide the cores and liners. Is a step of heating the starch paste to gelatinize and solidify the starch paste, and then adhering and press-bonding, there is no commonality between the both steps, and there is a drawback that two separate steps are required.

[0003]

DISCLOSURE OF THE INVENTION The present invention is a manufacturing method of a waterproof corrugated board in which a gluing step and a mechanism are unnecessary in the two steps of a waterproofing process and an adhering process, and the process is partially used to shorten the process. It is intended to provide a method.

[0004]

SUMMARY OF THE INVENTION In view of the problem that the waterproofing process is an additional process to the corrugated board manufacturing process based on the above-mentioned conventional technique, the waterproofing process is performed by bonding a synthetic resin film, and The resin film also serves as an adhesive, so that the gluing process and the mechanism are not required, and the series of manufacturing processes can be simplified and omitted.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will now be described with reference to the drawings, in which 1 is a waterproof, water-resistant and oil-resistant waterproof corrugated board, and the basic construction of the waterproof corrugated board 1 is substantially the same as that of a normal corrugated board. Then, the inner surfaces of the front and back liners 4, 5 are adhered to the upper and lower step ridges 3, 3a ... Of the center core 2.

Reference numerals 6 and 6a denote synthetic resin films adhered to the inner surfaces of the liners 4 and 5, and the step tops 3, 3a of the core 2 and the liners 4,
At the adhesion points 7 and 7a of 5, the synthetic resin films 6 and 6a are partially impregnated and adhered to each other, and the waterproof corrugated cardboard 1 having a new structure
Is done.

Further, as a construction of the waterproof corrugated board 8 of another embodiment, the synthetic resin films 6 and 6a may be formed on the front and back surfaces of the core 2, and the double-faced corrugated board has been described in the above embodiment. One-sided cardboard or double-sided cardboard may be used.

Next, the method of manufacturing the waterproof corrugated board according to the present invention will be described. First, the roll-shaped liner base paper 9 and 9a.
Adhesives 11, 11a such as a gravure printing method and a laminator are used to bond the heat-soluble synthetic resin to the inner surface of the core paper or the two surfaces of the core base paper 10, and the liner base paper 9, 9a or the core base paper 10
The synthetic resin films 6 and 6a which are uniform over the entire surface are formed.

Incidentally, in the formation of adhesion of the synthetic resin films 6 and 6a, the gravure printing method is a method of transferring the synthetic resin liquid or emulsion adhered to the roller to the running liner base paper 9 or 9a, and the like. It may be a roll coating device that coats the entire surface of 9, 9a or the like, or spray coating with a spray device. In these cases, a drying step is provided after coating, and in the laminator, the liner base paper 9, 9a, etc. is made of synthetic resin. The method of adhering the film is not limited to the above method for adhering the synthetic resin films 6 and 6a, and various methods can be selected.

Subsequently, the core raw paper 10 is set to a pair of corrugated rolls 12,
It is sent to 12a and processed into a corrugated shape, and then liner base paper 9 and 9a so that it is positioned above and below the core base paper 10.
The surface of the corrugated cardboard base paper 13 is brought into surface contact, and the corrugated cardboard base paper group 13 is sent to a heating part 14 composed of a heating plate, a corrugating belt, etc., and the traveling corrugated cardboard base paper group 13 is instantaneously heated to about 100 to 180 ° C. Heat to.

The liner base papers 9 and 9a in the heated corrugated fiberboard base paper group 13 or the synthetic resin films 6 and 6a adhered to the core base paper 10 are melted and the tops 3, 3a of the core base paper 10 and the liner base paper 9 are melted. , 9a are impregnated with the synthetic resin films 6 and 6a at the bonding points 7 and 7a, and the liner base papers 9 and 9a and the core base paper 10 are bonded by the pressure bonding simultaneously with heating, and pass through the cooling part 15 in the next step. It is cooled and then cut with a cutter 16 or the like.

The single-sided corrugated board and the double-sided corrugated board can be manufactured by the above-mentioned manufacturing method, and in manufacturing the double-sided corrugated board, a liner can be adhered after the single-sided corrugated board is manufactured. It is also possible to bond the base paper at the same time, or the single-sided corrugated board to the double-sided corrugated board.

Next, the operation of the waterproof corrugated board manufactured by the manufacturing method of the present invention will be explained. With the synthetic resin films 6 and 6a adhered to the core 2 or the liners 4 and 5, waterproofing, water resistance, oil resistance and the like are performed. , And the liner 4, 5 at the bonding points 7, 7a, the synthetic resin films 6, 6a are partly bonded to each other.

[0014]

In summary, according to the present invention, the heat-meltable synthetic resin films 6 and 6a are adhered to the back surfaces of the liners 4 and 5 or the core 2, and the liners 4 and 5 are brought into surface contact with each other and heated. The synthetic resin films 6 and 6a are melted and the liners 4 and 5 and the step tops 3 and 3a of the core 2 are adhered to each other. Synthetic resin film 6,
The waterproof corrugated board 1 can be manufactured in both of the bonding steps, which consist of 6a as a glue and an adhesive, and the pasting process and mechanism that were required in the past are not required, and the manufacturing process of the waterproof corrugated board 1 is shortened. You can do the same.

Further, in the waterproofing process, the conventional gravure printing system, laminator, etc. can be diverted, and in the heating action in the bonding process, the conventional starch paste was gelatinized and solidified, but in the present application, it is melt impregnated and solidified. However, the heating means can be diverted as it is, and it is very easy to carry out the manufacturing method of the present application.

[0016] Further, the conventional gluing is performed by the step tops 3, 3a ...
Since it is done only for the running sheet, the setting and adjustment of the glue to be applied due to the high speed running of the running sheet and the base paper had one side, but the adhesion of the synthetic resin films 6 and 6a of the present application is uniform over the entire surface. Different from the starch paste, the adhesive work can be performed easily and the adhesion failure can be prevented, and even if the liners 4 and 5 absorb water during use, the adhesive strength is reduced by the absorbed water. As a result, the core 2 and the liners 4, 5 can be prevented from peeling off.

Further, in the case of having two liners such as double-faced corrugated board, conventionally, after one side is glued and solidified, it is called a bridge from one-sided machine to two-sided machine, and it is a storage transfer for drying and speed adjustment. Although a means was required, in the present application, the two surfaces can be simultaneously bonded, the bridge itself can be eliminated, the drying time can be shortened, and such a process can be shortened, which is a great practical effect.

[Brief description of drawings]

FIG. 1 is a schematic front view showing a manufacturing process according to the present invention.

FIG. 2 is a sectional view of a corrugated board.

FIG. 3 is a sectional view of a corrugated board of another embodiment.

FIG. 4 is an enlarged cross-sectional view of a main part of a bonding point in FIG.

[Explanation of symbols]

 2 Core 3, 3a ... Step top 4 Liner 5 Liner 6, 6a Synthetic resin film

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[Procedure amendment]

[Submission date] May 21, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

The synthetic resin films 6 and 6a adhered to the liner base papers 9 and 9a or the core base paper 10 in the heated corrugated board base paper group 13 are melted and the tops 3 and 3a of the core base paper 10 are melted.
And the synthetic resin films 6 and 6a at the adhesion points 7 and 7a of the liner base papers 9 and 9a are impregnated into both, and the liner base papers 9 and 9a and the core base paper 10 are adhered by pressure bonding simultaneously with heating, and the cooling part 15 in the next step. To be cooled and then cut by a cutter 16 or the like. In addition, the liner raw is
The bonding state of the paper 9, 9a and the core raw paper 10 is shown in FIG.
However, due to fluctuations in heating temperature or pressure
The state is not limited to that shown in the figure, for example, the pressure force is increased.
At times, it is not possible to impregnate the core raw paper 10 with the synthetic resin films 6 and 6a.
Decreased and flowed before and after the steps 3, 3a ... of the core raw paper 10.
Similarly, the adhesion state changes.

Claims (2)

[Claims] 1. A heat-meltable synthetic resin film is adhered to the back surface of a liner so that the liner and the core are brought into surface contact with each other and heated so that the synthetic resin film is melted to bond the liner and the top of the core. A method of manufacturing a waterproof corrugated board characterized by the above. 2. A heat-meltable synthetic resin film is adhered to a core, and the liner and the core are brought into surface contact with each other and heated so that the synthetic resin film is melted to bond the liner and the corrugated top. A method of manufacturing a waterproof corrugated board characterized by the above.