JP2796773B2 - Manufacturing method of waterproof cardboard - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a waterproof cardboard having a novel structure by a simple process.

[0002]

2. Description of the Related Art Conventionally, a method for manufacturing a waterproof cardboard requires two steps, a waterproofing step and a bonding step. One of the two waterproofing steps is to apply a water-resistant agent to a cardboard, liner, or core. This is a process of spraying or applying a paraffin wax by a roller. In contrast to such a waterproofing process, the bonding process is to apply a starch paste to the top of the core at regular intervals, and abut the core with the liner. Is a step of heating the starch paste to gelatinize, solidify, adhere, and press-fit. There is no common point between the two steps, and there is a disadvantage that two separate steps are required.

[0003]

SUMMARY OF THE INVENTION The present invention provides a method for manufacturing a waterproof corrugated cardboard in which a gluing step and a mechanism are not required in the two steps of a waterproofing step and an adhering step, and the step is shortened by partially using the same. It does not provide a method.

[0004]

SUMMARY OF THE INVENTION According to the present invention, in view of the problem that the waterproofing step is an additional step to the cardboard manufacturing step, the waterproofing step is performed by bonding a synthetic resin film. containing resin film by pressure bonding heat
The present invention solves the above-mentioned problem by using an adhesive by immersion, thereby simplifying and omitting a series of manufacturing steps by eliminating the need for a gluing step and a mechanism.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a waterproof, water- and oil-resistant waterproof cardboard. The basic structure of the waterproof cardboard 1 is substantially the same as that of a normal cardboard. The upper and lower steps 3 and 3a of the corrugated middle core 2
The inner surfaces of the front and back liners 4 and 5 are bonded to.

Reference numerals 6 and 6a denote synthetic resin films having a thickness adhered to the inner surfaces of the liners 4 and 5, respectively.
The synthetic resin films 6 and 6a are partially impregnated and adhered to the adhesive points 7 and 7a of the liners 4 and 5 to form a waterproof cardboard 1 having a new configuration. Of the above adhesive state
The details will be described below.
, And a synthetic tree opposed to the tops 3, 3a.
The synthetic resin films 6, 6a are thermally melted when the fat films 6, 6a are bonded.
And the width and depth of the steps 3, 3 a.
It is in the state of being impregnated and adhered.

In the above embodiment, a double-sided cardboard is described, but a single-sided cardboard or a double-sided cardboard may be used.

Next, a method of manufacturing the waterproof cardboard according to the present invention will be described. First, the rolled liner base paper 9, 9
for the inner surface of a, gravure printing method, by bonding a synthetic resin of the heat soluble in the adhesive system 11,11a, such as laminator, overall uniform synthetic resin film to a predetermined surface of the liner base paper 9, 9a 6, 6a To form

In the formation of the synthetic resin films 6 and 6a, the gravure printing method is a method in which a synthetic resin liquid or an emulsion adhered to a roller is transferred to a running liner base paper 9 or 9a. Alternatively, a roll coating apparatus for applying the entire surface to the liner base papers 9 and 9a may be used, or a spraying apparatus may be used for spray coating. In these cases, a drying step is provided after the application, and a laminator is applied to the liner base papers 9 and 9a. This is a method in which a film made of synthetic resin is adhered, and the means for bonding the synthetic resin films 6 and 6a is not limited to the above method, and various methods can be selected.

Subsequently, the core base paper 10 is put into a pair of step rolls 1.
2, 12a to be processed into a corrugated shape,
Thereafter, the liner base papers 9 and 9a are brought into surface contact so as to be positioned above and below the core base paper 10, and the abutted cardboard base paper group 13 is heated by a heating part 14, a corrugating belt or the like. And the traveling corrugated paperboard group 13 is instantaneously heated to about 100 to 180 ° C. At the time of such heating, the corrugated shape of the core 2 is compressed.
Crimping the corrugated cardboard group 13 with a crimping force that does not crush it
doing.

[0011] La in linerboard group 13, which is heated
The synthetic resin films 6, 6a adhered to the base papers 9, 9a are melted, and the tops 3, 3a,.
The synthetic resin films 6 and 6a at the bonding points 7 and 7a of 9a are impregnated into both, and are press-bonded simultaneously with heating to obtain liner base papers 9 and 9a.
The core base paper 10 is adhered, cooled by passing through a cooling part 15 in the next step, and then cut by a cutter 16 or the like. FIG. 3 shows the bonding state between the liner base papers 9 and 9a and the core base paper 10 by heating and pressing . When increased, the core base paper 1
The impregnation of the synthetic resin films 6 and 6a into the core paper 1 is reduced.
The adhesive state changes as if it had flowed before and after the step tops 3, 3a.

In addition, single-sided cardboard and double-sided cardboard can be manufactured by the above-described manufacturing method, and a method of bonding a liner after manufacturing a single-sided cardboard can be used in manufacturing double-sided cardboard. It is also possible to glue the base paper at the same time or to glue the single-sided cardboard to the double-sided cardboard.

Next, the action of the waterproof cardboard manufactured by the manufacturing method of the present invention will be described. The synthetic resin films 6, 6a adhered to the liners 4, 5 perform waterproofing, water resistance, oil resistance, and the like. , The steps 3, 3a ... of the core 2 and the liner 4,
At the bonding points 7 and 7a in 5, a part of the synthetic resin films 6 and 6a are bonded to each other.

[0014]

In summary, the present invention provides a method of forming a synthetic resin film 6, 6a having a heat-meltable thickness on the back surfaces of the liners 4, 5 and the liners 4, 5 and the core 2 facing each other. Pressure bonding and heating are performed to such an extent that the shape does not crush and deform, and the synthetic resin film 6,
6a is melted and a part of the synthetic resin film 6, 6a is impregnated into the tops 3, 3a... Of the core 2 with a certain width, so that the liners 4, 5 and the top 3, 3a are adhered to each other, so that the waterproof cardboard 1 is used in both the steps of forming the synthetic resin films 6 and 6a, which are a waterproofing step, and the bonding step of forming the synthetic resin films 6, 6a with a paste and an adhesive. Can be manufactured, and the gluing step and mechanism conventionally required are unnecessary, and the manufacturing step of the waterproof cardboard 1 can be shortened.

In the waterproofing step, a conventional gravure printing method, a laminator or the like can be diverted, and in the heating action in the bonding step, the conventional starch paste was gelatinized and solidified. However, the heating means can be diverted as it is, and the production method of the present invention is very easy to carry out.

The conventional gluing is performed by using the steps 3 and 3a of the core 2.
.., It is difficult to set and adjust the size of the paste to be applied by running the traveling sheet and the base paper at a high speed. However, the adhesion of the synthetic resin films 6 and 6a according to the present invention is not uniform. For such bonding, the bonding operation can be easily performed and the bonding failure can be prevented . Further, the synthetic resin films 6, 6a
Compression bonding and impregnation improve adhesion and integrate
Can greatly strengthen the bonding state, for example,
Adhesive strength of starch paste as base paper type is smooth
Sufficient adhesion by impregnation
Can be secured, and furthermore, the waveform of the core 2 during crimping
With a crimping force that does not crush the shape,
The hollow structure of the water cardboard 1 can be maintained. or,
Even when moisture is absorbed by the liners 4 and 5 during use, the peeling of the core 2 and the liners 4 and 5 can be prevented, unlike the starch paste which reduces the adhesive strength due to the absorbed moisture.

In the case where two liners are provided, such as a double-faced corrugated cardboard, conventionally, after one side is glued and solidified, it is called a bridge from a single-sided machine to a two-sided machine. Although a means was required, in the present invention, the two-sided simultaneous bonding is possible, the bridge itself can be unnecessary, the drying time is short, and such a process can be shortened.

[Brief description of the 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 cardboard.

FIG. 3 is an enlarged sectional view of a main part of an adhesion point in FIG . 2;

[Explanation of symbols]

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

Claims (1)

(57) [Claims] 1. A synthetic resin film having a heat-melting thickness is formed on the back surface of the liner, and the liner and the center of the corrugated shape are opposed to each other. Melting the synthetic resin film, impregnating a part of the synthetic resin film of the liner with a width on the step of the core, and bonding the synthetic resin film of the liner and the step of the core. A method for producing a waterproof cardboard.