JP2003113593A - Liner board for corrugated fiberboard and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a liner board for a corrugated fiberboard, scarcely causing cracking of corrugation, nor splitting thereof, nor breaking thereof, when the corrugation is given by corrugating rolls, capable of preventing the corrugating rolls from being abraded, capable of decreasing an amount of consumed driving electrical power and noise, capable of uniformly and efficiently applying wax to the liner board, and capable of preventing equipment, such as a paper machine, from being stained. SOLUTION: This method for producing the liner board for the corrugated fiberboard comprises applying the wax to the liner board by using the paper machine equipped with two or more groups of driers, wherein a fluid dispersion of the wax is sprayed on the surface of a drier C8 by a sprayer (S), the sprayed wax is molten on the surface of the drier C8, and the surface of the drier is pressed and attached on the liner board 100, so that the molten wax is transferred to the liner board 100 from the surface of the drier C8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a core raw paper for corrugated board, and a method for producing the same, and more specifically, it does not cause step cracking, step breakage, or breakage during stepping on corrugated rolls.
Moreover, the present invention relates to a corrugated fiberboard core paper that can prevent wear of corrugated rolls and reduce drive power consumption and noise, and a method for manufacturing the same.

[0002]

2. Description of the Related Art Corrugated board is made by cutting and bending a flat core paper. The core fiberboard for corrugated board is stepped with a corrugator single facer, and is further laminated with a liner to form a single-sided corrugated sheet (liner with a core). It

FIG. 5 shows a forming process of a single-faced corrugated board sheet in this single facer. That is, the core raw paper 100 is first pressure-contacted at the meshing portion of the pair of corrugated rolls, that is, the upper corrugated roll 101 and the lower corrugated roll 102, and is stepped to form the core 103. Then, glue is applied to the top of the core 103 by the gluing roll 104, and the liner 106 and the top are pressed and bonded between the lower roll 102 and the pressure contact roll 105, so that the single-sided corrugated sheet 10
It is molded to 7.

However, in general, the core raw paper is subjected to a strong force such as pulling, bending, shearing, etc. from a pair of corrugating rolls at the time of corrugation, so that the corrugation breaks (corrugation crack) or the corrugated top breaks (corrugation). In some extreme cases, it may break across the entire width of the core raw paper. Further, the corrugated rolls are always worn due to the frictional force between the corrugated rolls and the core raw paper, which increases the consumption of drive power and the noise. Therefore, the polishing cycle of the corrugated roll is shortened and the operating rate is reduced.

From the viewpoint of recycling and the like, most of the core raw paper is currently made of recycled paper made from waste paper or the like. As a result, the core raw paper often contains foreign matters such as clay used for coated paper, and the reason why so-called low-grade waste paper such as magazine waste paper is blended Since then, the number of papers whose paper strength has decreased is increasing. Therefore, the above-mentioned step cracking, step breakage, breakage, etc. during the stepping are more likely to occur, and the ash content of clay or the like contained in the core raw paper causes the step roll to no longer be worn.

From the above, as a method of increasing the paper strength and reducing the friction with the corrugated rolls, the core raw paper is directly
A method of applying a wax has been developed. For example, there is a method in which the core raw paper is sandwiched between a pair of upper and lower holders of solid wax and the solid wax is applied to both front and back surfaces of the core raw paper while being pressed (see Japanese Patent Laid-Open No. 4-47930).

However, since too much wax is attached to the core raw paper, a large amount of the wax is transferred from the core raw paper to the corrugated roll and carbonized on the surface of the corrugated roll which is usually heated to about 160 to 190 ° C. Therefore, black streaks are attached to the stepped core or the liner is soiled, so that the quality of the core raw paper is deteriorated. Further, there is a drawback that the carbonized wax blocks the vacuum holes provided on the surface of the corrugated roll.

Therefore, a method has been developed in which the wax is applied to the core raw paper by spraying a solution-form or dispersion-form lubricant containing the wax. For example, in Japanese Patent Laid-Open No. 11-117188, 10 to 3 in the papermaking process are disclosed.
Manufacture of core raw paper for corrugated cardboard in which a lubricant is directly spray-applied to the core raw paper in a dryer with respect to the moisture of the raw paper showing a moisture content of 0% (usually, the dry state is less than 10%). A method is disclosed.

In this method, when the moisture contained in the core raw paper is dried, the moisture is diffused from the inside of the raw paper so that the lubricant does not penetrate into the inside of the raw paper and remains on the surface.
However, in such a method, an airflow is generated around the core raw paper which is running straight at a high speed. Therefore, when the lubricant is sprayed directly on the core raw paper, the lubricant is soared. As a result, the interior of the paper machine and the surrounding equipment are severely contaminated.

Further, when the water content of the core raw paper changes due to a temporary stop of the paper machine or the like, the wax adhesion state is easily affected and unevenness may occur. As described above, according to this method, the coating of the lubricant is not always uniform, so that the coating efficiency is deteriorated.

[0011]

SUMMARY OF THE INVENTION The present invention has been made in order to overcome the above-mentioned problems against the background of such circumstances. That is, an object of the present invention is to provide a corrugated fiberboard core paper that does not cause step cracking, step breakage, or breakage during stepping on a corrugated roll, and a method for producing the same.

Another object of the present invention is to provide a core raw paper which prevents wear of the corrugated rolls and reduces consumption of driving power and noise, and a method for producing the same. Furthermore, it is another object of the present invention to provide a method for producing a core raw paper which can uniformly and efficiently apply wax to the core raw paper and which does not contaminate equipment such as a paper machine.

[0013]

Thus, the present inventor has
As a result of earnest research on such a background,
Instead of spraying wax directly on the core raw paper,
By spraying the wax dispersion on a heated dryer to oilize the wax in the dispersion, or by spraying it on a roll that is in contact with the paper, the wax is indirectly transferred to the core raw paper. A suitable amount of wax can be uniformly and efficiently applied to the surface of the core raw paper, and moreover, it can be applied without contaminating the inside of the paper machine or the peripheral equipment, and when transferring the wax from the dryer or roll, the core raw paper is The present invention has been completed based on this finding that it was possible to transfer to the surface in a more concentrated manner in a dried state.

That is, the present invention relates to (1) a core raw paper for corrugated board, which is obtained by applying wax on the front and back surfaces,
The amount of wax applied to the core raw paper is 0.1 to 10 m.
It exists in the core raw paper for corrugated board which is g / m ² .

(2) The core raw paper is a corrugated core raw paper having a water content of less than 10% when wax is applied.

Further, (3), the wax is one in which a dispersion liquid of the wax is sprinkled on the final dryer of the paper machine, and the wax in the dispersion liquid is transferred to the core raw paper and applied. It exists in the core raw paper for corrugated board.

Further, (4), the wax is applied by dispersing a wax dispersion liquid on a paper roll of a paper machine and transferring the wax in the dispersion liquid to a core raw paper. It exists in the core raw paper for corrugated board.

Further, (5) a method for producing a corrugated fiberboard core paper coated with wax by a paper machine equipped with a plurality of groups of dryers, wherein a dispersion liquid of the wax is sprayed on the surface of the dryer. The present invention resides in a method for producing a corrugated fiberboard core paper in which the wax is oiled on the surface of the heated dryer and the oiled wax is transferred from the surface of the dryer to the surface of the fiberboard.

Further, (6), the dryer resides in a method for producing a corrugated fiberboard core paper which is a dryer belonging to the final group of paper machines.

Further, (7), the dryer resides in a method for producing a core raw paper for corrugated board which is a final dryer at an upper stage or a lower stage of the dryers belonging to the final group.

Further, (8), the wax has a melting point which is lower than the surface temperature of the dryer, in a method of producing a core raw paper for corrugated board.

Further, (9) a method for producing a core raw paper for corrugated cardboard coated with wax by a paper machine equipped with a paper roll, wherein a dispersion liquid of the wax is sprayed on the surface of the paper roll. A method for producing a core raw paper for corrugated board in which the wax is transferred from the surface of the paper roll to the surface of the core raw paper.

And (10), the wax is
The present invention resides in a method for producing a core raw paper for corrugated board, which is applied such that the coating amount on the core raw paper is 0.1 to 10 mg / m ² .

Further, (11), the core raw paper is
The present invention resides in a method for producing a corrugated fiberboard core paper having a water content of less than 10% when a wax dispersion liquid is applied.

And (12), the wax is
The present invention resides in a method for producing a core raw paper for corrugated cardboard in which a part of the core raw paper is transferred to the back surface of the core raw paper by further winding the core raw paper after the transfer to the surface of the core raw paper.

And (13), the wax is
A method for producing a corrugated fiberboard core paper using paraffin wax, polyethylene wax, or microwax alone or in combination.

Further, (14), the dispersion is in a method for producing a core raw paper for corrugated board which further contains a solid lubricant or a metal soap.

Further, (15), the dispersion is in a method for producing a corrugated fiberboard core paper which further contains oils.

Further, (16) a method of manufacturing a core raw paper for corrugated board coated with wax by a paper machine equipped with a plurality of groups of dryers, wherein the moisture content of the core raw paper passing through the paper machine is The wax dispersion is sprayed on the surface of the heated dryer in the area of less than 10%, and the wax is oiled on the surface of the heated dryer, and the oiled wax is transferred from the surface of the dryer to the core raw paper. Transferred to the surface, the amount of wax applied to the core raw paper is 0.1-10
It lies in a method for producing a core raw paper for corrugated board which is applied so as to have mg / m ² .

(17) A method for producing a core raw paper for corrugated board coated with wax by a paper machine equipped with a paper roll (17), wherein a wax dispersion is sprinkled on the surface of the paper roll to contain water. An amount of less than 10% is transferred to the surface of the core raw paper, and the wax is applied to the core raw paper so that the applied amount of the wax is 0.1 to 10 mg / m ² .

Further, (18), a wax or a wax dispersion applied to a corrugated fiberboard core paper, which wax is applied to the corrugated fiberboard core paper described in (3) or (4). Or it exists in a wax dispersion.

Further, (19) a wax or a wax dispersion used in the method for producing a corrugated fiberboard core paper, which is described in (5) or (9). Existing in the wax or the wax dispersion used.

If the present invention meets this purpose,
Naturally, the structure of the manufacturing method in which two or more selected from the above 1 to 4 and two or more selected from 4 to 17 are combined can be adopted.

[0034]

In the present invention, a total of 0.1 to 10% wax is applied to the front and back surfaces of a dry core raw paper having a water content of less than 10%.
Apply at a rate of 10 mg / m ² . When corrugated core paper coated with wax at such a ratio is stepped with corrugated rolls, it is possible to continuously supply an appropriate amount of wax that reduces friction with the corrugated rolls and does not cause charring to the corrugated rolls. The frictional resistance of the corrugated roll itself becomes small.

Such a core raw paper is obtained by transferring the wax oiled on the surface of the dryer to the surface of a dry core raw paper having a water content of less than 10% during papermaking. Alternatively, it can be obtained by transferring it to the surface of a similar dry core raw paper through a paper roll. Further, by immediately winding the core raw paper at a high temperature on a reel drum, a part of the wax applied to the front surface of the core raw paper can be further transferred and applied to the back surface.

[0036]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments will be given below.
The present invention will be described with reference to the drawings. The core raw paper of the present invention is a corrugated core raw paper having a front surface and a back surface coated with wax, and the amount of wax applied to the core raw paper is 0.1 to 10 mg / m ^2. Characterize.

As a matter of fact, as will be described later, a wax dispersion liquid is continuously sprayed on a dryer or a paper roll by a spraying device so that the applied amount of wax is 0.1 to 10 mg / m ^2. . However, even if the dispersion liquid is continuously sprinkled in this way, wax or the like will not be deposited on the surface of the dryer or the paper roll, or scraped off by the doctor blade. Therefore, it can be seen that the wax sprinkled on the dryer or the like at a rate of 0.1 to 10 mg / m ² is efficiently transferred to the surface of the core raw paper.

As this wax, paraffin wax, polyethylene wax, microwax, etc. are used, and these are used alone or in combination. The wax has the effect of significantly reducing the friction between the core raw paper and the corrugated roll when the core raw paper is stepped on the corrugated roll.

The amount of wax applied to the core raw paper is preferably in the range of 0.1 to 10 mg / m ^{2 in} total, more preferably 0.5 to 5 mg / m ² in total. If the coating amount is less than 0.1 mg / m ^2, the effect of reducing friction is not always obtained, and if it is more than 10 mg / m ² , the wax is transferred to the corrugated roll more than necessary and is often charred. The core base paper coated with wax on the front and back sides prevents step breakage, step breakage, and breakage of the core base paper when stepping the corrugated roll, prevents wear of the corrugated roll, and consumes drive power. And noise can be reduced.

[Outline of Paper Machine] Since the core raw paper of the present invention is manufactured in the stage of the paper making process, that is, in the paper machine, first, a general paper machine will be described with reference to the drawings. FIG. 1 is a schematic view of a paper machine. The paper machine comprises a press part A, a first group B of dryer parts, a final group C, and a reel part D (groups other than the first group and the last group of dryer parts are omitted).

The core raw paper passes through the paper machine. First, the core raw paper 100 that has entered the press part A is a flow pulp containing a large amount of water, and is dehydrated and pressed by a press roll and a press felt. Receive. After that, it is sent to a dryer part, and is dried by passing through several dozen dryers to be a core raw paper.

Usually, about 10 dryers form one group, and about 3 to 5 groups continuously form a dryer part. Further, in each group from the first group B to the final group C, the dryers are alternately arranged in an upper and lower order, and the upper canvases (B1, C9) and the lower canvases (B2, C10) are arranged in the respective dryers from the upper and lower sides. It is arranged so as to be in pressure contact.

The canvas is made of a relatively thin and strong cloth, such as a canvas made of synthetic resin. Then, the core raw paper 100 is sandwiched and strongly pressed against the dryer, and the heat of the dryer evaporates and disperses the water contained in the core raw paper 100.

Each dryer has a heat source inside, and normally the temperature of each dryer is set so that the temperature gradually increases from the first group B to the final group C.
Specifically, the temperature setting varies depending on the papermaking speed (papermaking speed) of the core raw paper 100 and the like. For example, the papermaking speed is 600 to 7
In the case of 00 m / min, the temperature of the dryer of the first group B is 80-
It is set to 100 ° C.

Further, the final dryer of the final group C (here, the final dryer C8 in the upper stage) is set to about 120 ° C., and the core raw paper in the area of the final dryer in the upper stage is generally called dry. The state, that is, the state where the water content is less than 10%. FIG. 2 is a schematic diagram showing a final group of dryer parts and a reel part of a paper machine.

In the final group C, as described above, the first group
To 6th dryer C1, C2, C3, C4, C
5, C6, a lower final dryer C7 and an upper final dryer C8 are alternately arranged vertically, and the upper canvas C9 and the lower canvas C10 are pressed against each other from above and below. Then, the temperature of each dryer is appropriately set, and the final dryer C
No. 8 is heated to the highest temperature of about 120 ° C.

When leaving the dryer part, the core raw paper 100
Is immediately sent to reel part D, paper roll D
It is tightly wound around the reel drum D4 via D and D3. A moisture measuring device D1 is installed between the final dryer C8 and the reel drum D4 to constantly monitor the amount of moisture contained in the core raw paper 100. At this stage, the core raw paper 100 is usually in a dry state having a water content of about 7 to 8%.

[Spraying process of dispersion liquid] In the present invention,
The wax is applied to the core raw paper by spraying the wax dispersion on the surface of the dryer or the paper roll of the paper machine and transferring the wax in the dispersion to the surface of the core raw paper. That is, the wax is indirectly applied via a dryer or the like, instead of directly applying the dispersion to the core raw paper as in the conventional case. Here, first, the application of wax via a dryer will be described, and the method of passing through a paper roll will be described later.

When wax is applied through a dryer,
First, the wax in the dispersed dispersion is oiled on the surface of the heated dryer, and the oiled wax is transferred from the surface of the dryer to the surface of the core raw paper. The wax transfer from the dryer is applied to the dryer belonging to the final group of the paper machine in order to transfer the core raw paper uniformly and efficiently when the core raw paper is in a dry state as much as possible.

Since the core raw paper is coated with wax in order to reduce the friction with the corrugating roll when it is stepped by the single facer of the corrugator, it is necessary to permeate the wax into the inside of the core raw paper. Instead, it is sufficient if it is applied only to its surface.

That is, the wax may be rubbed on the surface of the core raw paper, so to speak, and the wax is transferred in a more dry state than in a wet state where the core raw paper contains water. It is easy to understand that it is easy to be done, considering the relationship between water and oil. As described above, when the core raw paper is in a dry state, that is, when the water content is less than 10%, the wax accurately transfers from the dryer to the surface of the core raw paper.

Further, since the wax is oilized and diffused on the surface of the heated dryer, the wax can be uniformly applied to the core raw paper. Furthermore, since the wax does not penetrate into the core raw paper, the wax can be used efficiently.

Under ordinary papermaking conditions, the core raw paper that passes through the paper machine is dried to a moisture content of less than 10% in the final group C of the dryer part. Therefore, in most areas of the final group C, the water content is less than 10%, and the wax dispersion is sprayed on the heated dryers belonging to this final group to transfer the wax to the core raw paper. It is preferably applied.

Particularly in the final dryer, since the core raw paper is the most dry with the water content of about 7 to 8% as described above, it is more preferable to spray it here.
Further, since there is relatively a play space around the final dryer, it is easy to install a device for spraying the wax dispersion liquid, and it is convenient in terms of maintenance and the like.

Further, as described above, since the wax is intensively applied to the surface of the core raw paper, it is accurately and efficiently transferred to the surface of the corrugating roll when the corrugating roll is subsequently corrugated. . As a result, wear of the corrugated roll itself is prevented as described above.

FIG. 3 is an enlarged view of the vicinity of the final dryer (here, the final dryer in the upper stage is shown). Core base paper 10
0 is drawn between the final dryer C8 and the canvas roll C11, and the final dryer C8 is drawn by the upper canvas C9.
Is strongly pressed against the surface of. And the final dryer C8
(And the upper canvas C9) is moved along with the rotation, and is peeled off from the surface of the final dryer C8 at the position of the canvas roll C12 and wound on the lead drum D4.

On the other hand, in the section L where the core raw paper 100 is not in contact with the final dryer C8, the spraying device S is arranged. The spraying device S may be arranged behind the doctor blade T. However, the doctor blade does not necessarily have to be provided.

FIG. 4 is a diagram schematically showing a method for spraying the dispersion liquid. A plurality of movable spray nozzles S1 are attached to the frame S2 of the spray device S at intervals of 1 m. Specifically, if the width of the final dryer C8 is 4m, then 4 pieces, 5m
If so, you can attach five. Then, the wax dispersion liquid is sprayed toward the surface of the final dryer C8 while reciprocating right and left on the frame S2 at a speed of, for example, about 2 m / min.

At this time, some air flow is generated by the rotation of the final dryer C8, but if the spraying speed of the dispersion liquid in the spraying device (spraying nozzle) is sufficiently high, it is possible to prevent the dispersion liquid from rising. Further, as shown in FIG. 3, if the above-mentioned doctor blade T is provided, it is possible to further suppress the rising.

The case where the dispersion is sprayed toward the final dryer C8 in the upper stage has been described above. For example, when it is desired to apply wax to the opposite surface of the core raw paper, the dispersion is dispersed in the final dryer C7 in the lower stage. It is also possible to spray the liquid. Further, when the dispersion liquid is sprayed to the dryers other than the final dryers in the upper and lower stages, the spraying method shown in FIGS. 3 and 4 can be used for the same spraying.

[Wax Dispersion] Next, the wax dispersion used in the present invention will be described. This dispersion is
The wax is dispersed in water using a dispersant,
As will be described later, various additives are further added if necessary.

As described above, paraffin wax, polyethylene wax, microwax, etc. are preferably used alone or in combination with these waxes. These waxes are excellent in reducing friction and have a melting point lower than the surface temperature of the dryer (50 to 100).
Therefore, it is instantly oiled on the surface of the dryer heated to about 120 ° C.

It is more effective to add a solid lubricant or metal soap to the dispersion liquid. These solid lubricants and metal soaps adhere to the core raw paper together with the above wax, and play a role of further reducing friction with the corrugated rolls when the corrugated rolls are corrugated. Solid lubricants include molybdenum disulfide, tungsten disulfide, graphite fluoride, boron nitride,
Examples include silicon nitride.

Above all, when molybdenum disulfide is made into fine particles of the order of several μm, the friction coefficient becomes low (0.04
Degree) and is thermally and chemically stable, and thus is particularly preferably used. As the metal soap, stearic acid soap is preferably used.

Further, it is more preferable to add oils (mineral oil, silicone oil, synthetic oil, vegetable oil, animal oil, etc.) as a release agent (release agent) to the above dispersion liquid. When applied to a dryer, these oils diffuse on the surface of the dryer to form a film, which facilitates the transfer of wax, solid lubricant, and metallic soap from the surface of the dryer to the core raw paper. Further, it is of course possible to appropriately contain other additives in the dispersion liquid.

[Wax Application Process] As described above, when the dispersion liquid is sprayed from the spraying device S onto the surface of the dryer,
The wax in the dispersion is liquefied on the surface of the dryer and spreads on the surface. The wax is transferred from the surface of the dryer to the surface of the core raw paper and applied.

Then, the core raw paper is wound around the reel drum at a constant pressure. At that time, a part of the wax is transferred from the front surface of the core raw paper (that is, the surface where the wax is transferred from the dryer) to the back surface which is in a state of being opposed by this winding, and a part of the wax is also transferred to the back surface of the core raw paper. Is to be applied. This means that when the core raw paper is stepped, a lubricating function is exerted on both of the pair of corrugated rolls, which is an effect of preventing wear.

This point will be described in detail with reference to FIG.
First, on the surface of the rotating final dryer C8, the wax in the already dispersed dispersion liquid forms a thin film.
When the dispersion liquid is sprayed thereon by the spraying device S, the water content in the dispersion liquid is evaporated by the heat of the final dryer C8, and the wax is melted into oil and diffused on the film.

While the core raw paper 100, the final dryer, and C8 rotate and move together while being pressed against the upper canvas C9, the oiled wax becomes the final dryer C8.
From the surface of the core raw paper 100 to the surface of the core raw paper 100,
00 is coated with wax.

The core raw paper 100 thus coated with the wax on the surface is separated from the final dryer C8 at the position of the canvas roll C12, passes through the paper rolls D2 and D3, and is immediately taken up by the reel drum D4. On this occasion,
Since the core raw paper 100 wound on the reel drum D4 still has residual heat, the wax on the surface of the core raw paper 100 partially transfers and adheres also to the back surface of the core raw paper 100 which is in a facing state. Of. Thus, the application of wax to the core raw paper is completed.

Next, a method of applying the wax to the core raw paper through the paper roll instead of the dryer will be described (see FIG. 2). In this method, a wax dispersion is dispersed on the surface of a paper roll, and the wax in the dispersion is transferred from the surface of the paper roll to the surface of the core raw paper.

As described above, the paper roll D2 (D
The same applies to 3rd grade. The same applies hereinafter), the core raw paper is already in a dry state with a water content of about 7 to 8%. That is, as described above, the wax is easily transferred to the surface.

Moreover, the core raw paper is immediately after passing through the dryer part C, and the temperature thereof is as high as about 70 ° C.
Paper roll D2 is not heated by itself,
It receives heat from the core raw paper and is at about the same temperature.
Therefore, when the dispersion liquid is sprayed on the paper roll, the wax becomes oily or at least softens, so that the wax can be accurately, uniformly, and efficiently transferred to the surface of the core raw paper as in the case of the dryer. is there.

Also in the case of this paper roll, the method of spraying the dispersion liquid, the partial transfer of the wax to the back surface by winding the core raw paper, the use of paraffin wax as the wax, the solid lubricant for the dispersion liquid, and the like. Addition of oils, etc.
It is similar to the case of the dryer. Further, not only paper rolls, but also rolls that come into contact with the core raw paper when the core raw paper is conveyed in the reel part D (see FIG. 1), for example, a calendar roll or the like, can apply the wax uniformly and efficiently. It is possible to

Hereinafter, the results of experiments conducted on the core raw paper when the dispersion state of the dispersion is variously changed in the method for producing the core raw paper of the present invention will be shown by examples. The present invention is not necessarily limited to the following examples.

The core raw paper used in the experiment was manufactured under the following conditions. [Papermaking conditions] Paper machine: Ultraformer (manufactured by Kobayashi Seisakusho Co., Ltd.) Papermaking brand: Normal core basis weight: 160 g / m ² Papermaking speed: 300 m / min or 600 m / min Paper width: 4 m or 5 m

[Spraying conditions] Spraying place: Final dryer (see C8 in FIG. 2) or paper roll (see D2 in FIG. 2) in the upper stage Spraying method: 4 nozzles in case of paper width 4 m, 5 nozzles in case of width 5 m From each of 1, 5, 10 or 20 cm ³ / min (total of 5, 25, 50 or 100 cm ³ / min, respectively) Sliding speed: 2 m / min Solid lubricant: 1% by weight molybdenum disulfide Metal soap: stearin Acid soap 1% by weight Oils: Silicon oil 10% by weight It should be noted that the wax used had a melting point of 70 ° C. or less.

[Example 1] A 10 wt% dispersion of microwax in a total amount of 25 cm ³ / dispersed cloth was applied to the final dryer in the upper stage, and a wax for the core raw paper was produced under the conditions of a paper width of 5 m and a speed of 600 m / min. Was applied at 0.8 mg / m ² . * Calculation formula: (25g / min × 0.1) / (5m × 600m
/Min)=0.8 mg / m ² (However, specific gravity is 1 g / cm ³
Calculated as, the same below)

Example 2 A total of 50 cm ³ / dispersion of a 10% by weight wax mixture in which paraffin wax and polyethylene wax were mixed in equal amounts in the final dryer in the upper stage was applied under the conditions of a paper width of 5 m and a machine speed of 600 m / min. The amount of wax applied to the core raw paper made into paper was 1.7 mg / m ² .

[Embodiment 3] Paragraphs are added to the final dryer in the upper stage.
A wax containing equal amounts of fine wax and micro wax.
50 cm total of 10 wt% dispersion^Three/ Disperse cloth,
A core material made with a paper width of 4 m and a speed of 300 m / min.
The amount of wax applied to the paper is 4.2 mg / m ^TwoAnd

[Example 4] A 25 wt% dispersion of microwax in a total amount of 100 cm ³ / dispersed cloth was applied to the final dryer in the upper stage, and a wax for a core raw paper was formed under the conditions of a paper width of 5 m and a speed of 600 m / min. Was applied at 8.3 mg / m ² .

[Example 5] A 20% by weight dispersion of paraffin wax was dispersed on a paper roll in a total amount of 50 cm ³ / dispersion cloth, and the wax was applied to a core raw paper produced under the conditions of a paper width of 5 m and a paper making speed of 600 m / min. The amount was 3.3 mg / m ² .

[Comparative Example 1] (Example of excessive amount of wax applied) A total of 100 cm ³ of 50 wt% dispersion liquid of microwax was dispersed / distributed on the final dryer in the upper stage, and the paper width was 5 m and the papermaking speed was 60.
The amount of wax applied to the core raw paper produced under the condition of 0 m / min was 16.7 mg / m ² .

Comparative Example 2 (Example of Insufficient Wax Coating Amount) A 5 wt% dispersion liquid of microwax was dispersed in a total amount of 5 cm ³ / dispersed cloth on the final dryer in the upper stage, and the paper width was 5 m and the machine speed was 600 m /
The amount of wax applied to the core raw paper made under the condition of minutes was 0.08 mg / m ² .

Comparative Example 3 (Example of Excessive Wax Coating Amount) A total of 100 cm 3/40 cm ³ of paraffin wax dispersion liquid was dispersed / dispersed on a paper roll, and the paper width was 5 m and the papermaking speed was 600.
The amount of wax applied to the core raw paper produced under the conditions of m / min was 13.3 mg / m ² .

Comparative Example 4 (Example of Insufficient Wax Application Amount) A 5% by weight dispersion of paraffin wax was dispersed on a paper roll in a total amount of 5 cm ³ / dispersed cloth, and papermaking was carried out under the conditions of a paper width of 5 m and a papermaking speed of 600 m / min. The amount of wax applied to the core raw paper was 0.08 mg / m ² .

[Comparative Example 5] [Normal production method (blank)] Papermaking was performed under the conditions of a paper width of 5 m and a paper-making speed of 600 m / min without sprinkling wax at all to obtain a core raw paper.

[Friction Experiment] Examples 1 to 4 and Comparative Examples 1 to 1
With respect to the core raw paper of No. 3, the friction coefficient (sliding start angle) was measured in accordance with the inclination method of JIS P8147, and the sliding start angles of the front surface and the back surface were measured for each. The results of the first and fifth measurements are represented by the difference between the results of Comparative Example 5 (experimental values for Comparative Example 5) and are shown in Table 1.

[0089]

[Table 1]

[Results] The core raw paper coated with wax was
Compared with Comparative Example 5, the sliding start angle was almost smaller. That is, it can be seen that the frictional resistance has decreased. However, when the wax coating amount was 4.2 mg / m ² or more (Examples 3, 4 and Comparative Example 1), almost no change was observed in the sliding start angle even if the coating amount was increased.

[Measurement of Driving Power Consumption of Step Rolls and Noise] The core raw papers of Examples 1 to 4 and Comparative Examples 1 to 3 were each passed through a corrugator (50E manufactured by Mitsubishi Heavy Industries, Ltd.),
The drive power consumption and noise in the corrugated rolls were measured under the conditions of a paper width of 1 m and a laminating speed of 150 m / min.

At this time, in the experiment using Comparative Example 1,
Since the wax transferred to the corrugated roll was carbonized, black streaks adhered to the corrugated core and the liner was also soiled. In addition, due to the excessive amount of wax, a bonding failure was caused by the gluing roll. In Comparative Example 3 as well, a substantially similar state occurred.

Therefore, in Comparative Examples 1 and 3, the corrugator production of corrugated board was stopped and excluded from this experiment and the following experiments. In other examples, no charring or the like was observed. The measurement results are shown in Table 2.

[0094]

[Table 2]

[Results] Regarding the consumption of driving power, a decrease was observed in Examples 1 to 5 as compared with Comparative Example 5, and there was almost no change in Comparative Examples 2 and 4. Also, with regard to noise, a decrease was observed in Examples 1 to 5, and there was almost no change in Comparative Examples 2 and 4.

[Step Crack and Step Break Inspection] When the core raw papers of Examples 1 to 5 and Comparative Examples 2, 4 and 5 were passed through a corrugator (60G manufactured by Mitsubishi Heavy Industries, Ltd.) and the laminating speed was increased, The speed at which step cracks and step breaks occurred was recorded.

[Results] In Comparative Example 5, the laminating speed was 300 m /
There was a case where step cracks occurred in minutes, but the core raw papers of Examples 1 to 5 did not cause step cracks even when the laminating speed was increased to 390 m / min. Further, in the core raw paper of Comparative Example 2, 3
It was observed that step cracking occurred at 30 m / min, and step cracking occurred before reaching 390 m / min in all the number of experiments (5 times) performed. Furthermore, in the core raw paper of Comparative Example 4, 350 m
In some cases, step cracks occurred at / m, and four of the 5 experiments performed, which caused step cracks before reaching 390 m / min. Did not happen.

[Abrasion Inspection of Corrugated Rolls] The core raw papers of Examples 1 to 5 and Comparative Example 5 were passed through a corrugator (50E manufactured by Mitsubishi Heavy Industries, Ltd.) to obtain a paper width of 1 m and a laminating speed of 150 m / min. Hours and after operating for 2000 hours,
The pressure-sensitive paper was passed through the corrugated rolls to examine the worn state of the corrugated rolls. The degree of wear of the corrugated rolls can be visually confirmed by the degree of coloring of the pressure sensitive paper.

[Results] In any of the above examples,
The pressure sensitive paper was uniformly colored (that is, there was no change in pressure due to the corrugated roll site and the pressure was applied uniformly). Therefore,
Little wear was seen. In Comparative Example 5,
In the experiment after 1000 hours, the vicinity of both ends of the pressure-sensitive paper was already slightly darker than the center portion (that is, the center portion of the corrugated roll began to wear), and it was noticeable after 2000 hours.

Based on the above experiments, the suitable amount of wax applied to the core raw paper is 0.1 to 10 mg / m ^2.
Is determined.

Although the present invention has been described above, it is needless to say that the present invention is not limited to the experimental examples and various other modifications can be made without departing from the essence thereof. For example, in the present specification, the case of spraying the dispersion liquid to the upper final dryer has been described, but a method of performing a combination of a plurality of dryers such as a lower final dryer and upper and lower final dryers. Can of course be adopted.

[0102]

According to the present invention, it is possible to manufacture a corrugated fiberboard core paper that does not cause step cracking, step breakage, or breakage during stepping on a corrugated roll. Further, it becomes possible to manufacture a core raw paper which prevents abrasion of the corrugated rolls and reduces driving electric power consumption and noise. Furthermore, the wax can be uniformly and efficiently applied to the core raw paper, and the core raw paper can be produced without contaminating equipment such as a paper machine.

[Brief description of drawings]

FIG. 1 is a schematic view of a paper machine.

FIG. 2 is an enlarged view of the vicinity of a final dryer.

FIG. 3 is a diagram schematically showing a method for spraying a dispersion liquid.

FIG. 4 is a schematic view of a final group of dryer parts and a reel part of a paper machine.

FIG. 5 is a diagram showing a forming process of a single-faced corrugated board sheet in a single facer.

[Explanation of symbols]

A ... Press part B: First group of dryer parts B1 ... Upper canvas B2 ... Lower canvas C ... the last group of dryer parts C1 ... First dryer C2 ... Second dryer C3 ... Third dryer C4 ... 4th dryer C5 ... Fifth dryer C6 ... Sixth dryer C7 ... Final dryer in the lower row C8 ... the last dryer in the upper row C9 ... Upper canvas C10 ... Lower canvas C11 ... Canvas roll C12 ... Canvas roll D ... reel part D1 ... Moisture analyzer D2 ... Paper roll D3 ... Paper roll D4 ... reel drum L: section S ... Spraying device S1 ... Spray nozzle S2 ... Frame T ... Doctor blade 100 ... Core raw paper 101 ... Upper roll 102 ... Lower roll 103 ... Core 104 ... Gluing roll 105 ... Pressure contact roll 106 ... Liner 107 ... Single-sided corrugated sheet 108 ... glue tank

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3E078 AA13 AA20 BB23 BB35 BB39                       BB44                 4L055 AG51 AH50 BE08 CH10 CH30                       EA13 EA14 FA22 GA06

Claims (19)

[Claims] 1. A core raw paper for corrugated board having a front surface and a back surface coated with wax, wherein the amount of wax applied to the core raw paper is 0.1 to 10 mg / m ^2. Core raw paper for use. 2. The core raw paper for corrugated board according to claim 1, wherein the core raw paper has a water content of less than 10% when wax is applied. 3. The wax is obtained by applying a wax dispersion liquid to a final dryer of a paper machine, transferring the wax in the dispersion liquid to a core raw paper, and applying the wax. The core raw paper for corrugated board according to claim 1. 4. The wax is obtained by dispersing a wax dispersion liquid on a paper roll of a paper machine, transferring the wax in the dispersion liquid to a core raw paper, and applying the wax. The core raw paper for corrugated board according to claim 1. 5. A method for producing a core raw paper for corrugated board coated with wax by a paper machine equipped with a plurality of dryers, wherein a dispersion of the wax is sprayed on the surface of the dryer, and a heated dryer is used. Oil the wax on the surface,
A method for producing a core raw paper for corrugated board, which comprises transferring the oiled wax from the surface of the dryer to the surface of the core raw paper. 6. The method for producing a corrugated fiberboard core paper according to claim 5, wherein the dryer is a dryer belonging to the final group of paper machines. 7. The method for producing a corrugated fiberboard core paper according to claim 5, wherein the dryer is an upper or lower final dryer of the dryers belonging to the final group. 8. The method for producing a corrugated fiberboard core paper according to claim 5, wherein the wax has a melting point lower than the surface temperature of the dryer. 9. A method for producing a corrugated fiberboard core paper coated with wax by a paper machine equipped with a paper roll, wherein a dispersion liquid of the wax is sprinkled on the surface of the paper roll, and the wax is applied to the paper. A method for producing a corrugated fiberboard core paper, which comprises transferring from a roll surface to a corrugated fiberboard surface. 10. The method for producing a corrugated fiberboard core paper according to claim 5, wherein the wax is applied so that the amount of the wax applied to the corrugated fiberboard is 0.1 to 10 mg / m ^2. Method. 11. The method for producing a core raw paper for corrugated board according to claim 5, wherein the core raw paper has a water content of less than 10% when a wax dispersion liquid is applied. 12. The wax is transferred to the surface of the core raw paper, and then part of the wax is transferred to the back surface of the core raw paper by further winding the core raw paper.
Or the manufacturing method of the core raw paper for corrugated board of 9th. 13. The wax may be paraffin wax, polyethylene wax, or microwax, which may be used alone or in combination.
Or the manufacturing method of the core raw paper for corrugated board of 9th. 14. The method for manufacturing a corrugated fiberboard core paper according to claim 5, wherein the dispersion liquid further contains a solid lubricant or a metal soap. 15. The method for producing a core raw paper for corrugated board according to claim 5, wherein the dispersion further contains oils. 16. A method of manufacturing a core raw paper for corrugated board coated with wax by a paper machine equipped with a plurality of dryers, wherein the core raw paper passing through the paper machine has a water content of 1 or less.
The wax dispersion is sprayed on the surface of the heated dryer in the area of less than 0%, and the wax is oiled on the surface of the heated dryer, and the oiled wax is transferred from the surface of the dryer to the core raw paper. A method for producing a core raw paper for corrugated board, which comprises applying the wax to the surface so that the amount of wax applied to the core raw paper is 0.1 to 10 mg / m ² . 17. A method for producing a corrugated fiberboard core paper coated with wax by a paper machine equipped with a paper roll, wherein a wax dispersion is sprayed on the surface of the paper roll, and the water content is less than 10%. The amount of wax applied to the core raw paper is 0.1-1.
A method for manufacturing a core raw paper for corrugated board, which is applied so as to be 0 mg / m ² . 18. A wax or a wax dispersion applied to a corrugated fiberboard core paper, which is applied to the corrugated fiberboard core paper according to claim 3 or 4. Dispersion of. 19. A wax or a wax dispersion used in a method for producing a corrugated fiberboard core paper, which is used in the method for producing a corrugated fiberboard core paper according to claim 5 or 9. A wax or wax dispersion.