JP5590941B2 - Method and apparatus for gluing cardboard manufacturing apparatus - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a gluing method and a gluing device for adhering a glue solution to a core or a single-sided cardboard sheet constituting a corrugated sheet in a single facer or a double facer constituting a corrugated board production apparatus for producing a corrugated cardboard sheet. .

  In the single facer, a gluing device for applying a paste liquid to the step top of the center core is used in order to bond the stepped core to the back liner. In the double facer, a gluing device for applying a glue solution to the step top of the single-sided cardboard sheet is used to bond the single-sided cardboard sheet having the core and the back liner bonded together and the front liner.

In these gluing apparatuses, the gluing liquid stored in the gluing tank is adhered to the gluing roll, and after adjusting the gluing liquid adhering to the gluing roll to the set film thickness by the doctor roll, the gluing liquid on the gluing roll Is transferred to the core or the top of the single-sided cardboard sheet.
The glue tank is provided with a glue dam for regulating the application width of the glue liquid to the gluing roll. The application width of the paste liquid needs to be matched with the paper width of a paper web such as a core or a single-sided cardboard sheet. Since the type of paper web changes frequently, the paper width changes accordingly. Therefore, Patent Literature 1 and Patent Literature 2 disclose a configuration in which the glue dam is configured to be movable in the longitudinal axis direction of the glue roll and the glue width of the glue liquid to be attached to the glue roll can be adjusted. Yes.

Patent Document 3 discloses means for detecting the paper width of the paper web to which the adhesive liquid adheres and automatically positioning the movable glue dam at a position corresponding to the paper width.
Further, the gluing device disclosed in Patent Document 4 adjusts the film thickness of the glue solution adhering to the gluing roll with a doctor blade, then smoothes the glue film with the extended tongue-shaped piece, and the smoothed glue film is applied to the paper web. It is made to apply to.

JP 2003-245988 A JP 2006-69095 A JP 2000-254987 A Japanese Patent Laid-Open No. 10-180908

  FIG. 4 shows an area in the vicinity of the left paper end of the gluing roll in the double facer gluing apparatus, and shows the distribution of the glue liquid adhering to the gluing roll expanded upward. In FIG. 4, the glue device 100 stores the glue liquid tank 102, the glue roll 104 whose lower part is immersed in the glue liquid g, and the glue film thickness corresponding to the glue roll 104. A doctor roll 108 is provided in parallel with the gluing roll 104 with a minute interval. The gluing roll 104 and the doctor roll 108 rotate in the direction of the arrow about the rotation shaft 106 or 110, respectively.

When the paste liquid g passes between the nips of the pasting roll 104 and the doctor roll 108, the set film thickness is adjusted. The glue roll 104 is provided with a glue dam 112 that regulates the application width of the glue liquid g in the axial direction (arrow a direction). The glue dam 112 is movable in the direction of arrow a, and another glue dam is provided in the right side paper end region of the paper web (not shown). Size liquid g is stored between glue dam 112, the liquid level g _s of the sizing solution g is formed. By gluing roll 104 rotates, the outer peripheral surface of the glue roll 104, size liquid g pooled in the size liquid tank 102 is attached, to form a Norimaku g _f.

  Since the glue dam is in contact with the surface of the gluing roll at a low surface pressure, the glue film cannot be scraped sufficiently, and a thin glue film remains in the contact area of the glue dam. There is a problem that the glue film passes through the gap between the glue roll and the doctor roll and is transferred to the paper web.

Norimaku g _f the glue roll 104 is adhered to the glue roll 104 and passes through the sizing solution g which stores the size liquid tank 102 is greater than the spacing between the glue roll 104 and the doctor roll 108. Further, the surface of Norimaku g _f is the free surface, (depend on the temperature.) The viscosity of the sizing solution g and a different thickness depending peripheral speed of the gluing roller 104.

Therefore, as shown in FIG. 4, even if the glue edge t ₁ of Norimaku g _f is restricted by the glue dam 112 is set to the inside by the dimension m against the paper web sheet edge w, the doctor roll after passing through the 108, the size liquid g comes protrudes outwardly to the position of Noritan t _2. As described above, the protrusion width b cannot be predicted because the adhesive film thickness varies depending on the conditions at that time and a free surface is formed.

When the glue liquid g protrudes from the paper edge w, in the single facer, the glue liquid g wraps around the back side of the paper web and adheres to the corrugated roll. When the paste liquid g adheres to the corrugated roll, there is a problem that the corrugated product is solidified and the corrugated molding becomes defective.
Also, when the single-sided cardboard sheet travels on the hot plate of the double facer, the glue liquid g protruding from the paper edge w adheres to the hot plate and solidifies on the hot plate. There is a problem of hurting.

  Patent Document 3 discloses an automatic positioning means for a movable glue dam. However, if such a means also solves the above-described problem and the application width of the glue liquid with high accuracy cannot be regulated, the effect is halved. End up. Moreover, such a problem cannot be solved by the means disclosed in Patent Document 4, that is, a configuration in which an extending tongue piece for leveling the glue film is provided on the downstream side of the doctor blade.

  In view of the problems of the prior art, the present invention makes it possible to accurately predict the protruding width of the glue liquid, facilitates the alignment of the paper edge and the glue edge, and thereby the glue liquid from the paper edge of the paper web. An object of the present invention is to prevent the above-mentioned problem by preventing the protrusion.

In order to achieve such an object, the gluing method of the corrugated board manufacturing apparatus according to the present invention is such that a part of the gluing roll is immersed in the gluing liquid stored in the gluing bath, and the gluing liquid adhering to the gluing roll is transferred to the doctor roll. In the gluing method of the corrugated board manufacturing apparatus in which the glue liquid is transferred to the paper web constituting the corrugated cardboard sheet after being adjusted to the set film thickness by the method, the glue liquid adhering to the glue roll is upstream of the doctor roll. Among them, a pre-equalization area is set in which the paste liquid is transferred to the area inside the paper edge including the paper edge of the paper web, and the pre-equalization area is adjusted to an average film thickness larger than the set film thickness. And after the pre-equalization step, the pre-equalization area is estimated from the difference between the set film thickness and the average film thickness from the paper edge to the inner area including the paper edge of the paper web. Set the paste removal area that is larger than the overhang width. A glue liquid removing step for removing the glue liquid from the glue liquid removing region, and a glue film thickness adjusting step for adjusting the glue liquid on the glue roll to a set film thickness by a doctor roll on the downstream side of the glue liquid removing step; Tona is, the leveling set the film thickness film thickness greater than a predetermined value, by adjusting the size liquid removal region in accordance with the set thickness, size solution after transfer to the size liquid of the paper web of the paper web paper It is intended to prevent it from protruding from the edge .

In the method of the present invention, by performing the preliminary leveling step on the upstream side of the doctor roll, it is possible to easily predict the protrusion width of the paste liquid from the paper end after passing through the doctor roll.
Then, in the paste removing step, the protruding width of the paste from the paper edge is predicted, a paste removing area that is equal to or larger than the protruding width is set, and the paste is removed from the paste removing area. It is possible to reliably prevent the paste from protruding from the paper edge after passing.

  As described above, in the method of the present invention, the paste liquid protrudes from the edge of the paper by performing a combination of the pre-equalizing step and the glue removing step before the glue film on the glue roll passes through the doctor roll. Can be reliably prevented. Thus, the above problem can be solved.

In the method of the present invention , by setting the average film thickness to a constant value, the set film thickness and the protruding width of the paste liquid passing through the doctor roll have a unique correlation. Therefore, by adjusting the estimated protrusion area according to the set film thickness, it is possible to reliably prevent the paste liquid from protruding from the paper edge.

  INDUSTRIAL APPLICABILITY The method of the present invention can be applied to a single facer gluing device that joins a core and a back liner, and a double facer gluing device that joins a single-sided corrugated cardboard sheet that joins a core and a back liner to a front liner. It can also be applied to.

Further, the gluing device of the corrugated board manufacturing apparatus of the present invention that can be used directly for carrying out the method of the present invention comprises a paste liquid tank storing a paste liquid, a part of the paste liquid being immersed in the paste liquid, and a paste liquid on the surface. A paper web comprising a glue roll to be adhered and a doctor roll for adjusting the glue liquid adhered to the glue roll to a set film thickness, and the glue liquid on the glue roll adjusted to the set film thickness constitutes a corrugated cardboard sheet In the gluing device of the corrugated board manufacturing apparatus, the glue liquid adhering to the gluing roll on the upstream side of the doctor roll, including the paper edge of the paper edge of the paper web, in the inner area from the paper edge. A weir plate that adjusts the pre-equalized area to which the film is transferred to a uniform film thickness greater than the set film thickness, and the paper web of the pre-equalized area downstream of the weir plate and upstream of the doctor roll. Including the paper edge and the inner area from the paper edge, Comprising a scraper for removing size liquid from the set size liquid removal area so that the estimated protruding width or more is estimated from the difference between the film thickness, and the smoothing film thickness setting thickness greater than a predetermined value, The set film thickness is input, the adhesive solution removal area is adjusted, and a controller is provided that adjusts the adhesive solution so that it does not protrude from the paper edge of the paper web after transfer of the adhesive solution to the paper web. is there.

  In the apparatus of the present invention, the glue that adheres to the surface of the glue roll in the glue tank and forms a free surface is glued on the upstream side of the doctor roll, including the paper edge of the paper edge of the paper web, to the area inside the paper edge. A pre-equalization area to which the liquid is transferred is set, and this pre-equalization area is adjusted to a uniform film thickness larger than the set film thickness using a dam plate. This makes it possible to easily predict the protruding width of the paste from the paper edge after passing through the doctor roll. Then, the width of the paste liquid protruding from the end of the paper is predicted, a paste liquid removal area equal to or larger than the width of the paste is set, and a scraper provided on the downstream side of the dam plate and on the upstream side of the doctor roll Remove the paste from the removal area. As a result, it is possible to reliably prevent the paste from protruding from the paper edge after passing through the doctor roll.

In the present invention apparatus, by equalizing said thickness a constant value, and the protruding width of the set film thickness and the size liquid of the doctor roll pass, will have a unique correlation. Therefore, by adjusting the estimated protrusion area according to the set film thickness, it is possible to reliably prevent the paste liquid from protruding from the paper edge.

In the apparatus of the present invention, the scraper is made of an elastic body, and the scraper tip is arranged so as to have an angle of attack with respect to the tangential direction of the gluing roll, and is in line contact with the gluing roll surface. Good.
By using the scraper as an elastic body, it is possible to prevent the gluing roll from being damaged. Further, by arranging the scraper so as to have an angle of attack with respect to the tangential direction of the gluing roll, it is possible to maintain the contact with the surface of the gluing roll and reliably scrape off the glue film.

  According to the method of the present invention, after a part of the gluing roll is immersed in the gluing liquid stored in the gluing liquid tank, the gluing liquid adhering to the gluing roll is adjusted to a set film thickness by a doctor roll, and then the gluing liquid In the gluing method of the corrugated board manufacturing apparatus that transfers the paper to the paper web constituting the corrugated cardboard sheet, the glue liquid adhering to the gluing roll on the upstream side of the doctor roll, including the paper edge of the paper web, from the paper edge A pre-equalization step is set, in which a pre-equalization area where the glue solution is transferred to the inner area is adjusted, and the pre-equalization area is adjusted to a uniform film thickness larger than the set film thickness. In this area, a paste removal area that is larger than the estimated protrusion width estimated from the difference between the set film thickness and the average film thickness is set in the inner area from the paper edge including the paper edge of the paper web. A paste removing step for removing the paste from the area; After the liquid removal step, the glue film thickness adjusting step for adjusting the glue liquid on the glue roll to the set film thickness by the doctor roll, and thereby protruding the paste liquid from the paper edge after passing through the doctor roll As a result, it is possible to prevent the glue solution from adhering to the corrugated roll of the single facer and causing the step forming of the core to become defective, and to corrugated cardboard by the glue that adheres and solidifies on the hot plate of the double facer. It is possible to prevent the sheet from being damaged.

  According to the apparatus of the present invention, a paste liquid tank that stores paste liquid, a glue roll that is partially immersed in the glue liquid and adheres to the surface of the glue liquid, and a glue film that adheres to the glue roll are set films. A gluing device of a corrugated board manufacturing apparatus, wherein the gluing liquid on the gluing roll adjusted to the set film thickness is transferred to a paper web constituting the corrugated cardboard sheet. On the upstream side, of the glue solution adhering to the glue roll, a pre-equalized area in which the glue liquid is transferred to the inner area from the paper edge including the paper edge of the paper web is larger than the set film thickness. The dam plate to be adjusted to the thickness, and the pre-equalization area on the downstream side of the dam plate and the upstream side of the doctor roll, including the paper edge of the paper web, from the paper edge to the inner area, and the set film thickness To be more than the estimated protrusion estimated from the difference with the film thickness A scraper for removing the size liquid from the constant has been size liquid removal area, by having a can be obtained the same effects as the present invention method.

It is a block diagram of the gluing device of the double facer which concerns on one Embodiment of this invention method and apparatus. It is a layout view of the glue dam, the dam plate, and the elastic scraper of the embodiment. (A) is a block diagram of the elastic scraper of this invention, (B) is a block diagram of the elastic scraper as a comparative example. It is explanatory drawing which shows the protrusion width | variety of the paste liquid on the pasting roll after passing a doctor roll.

  Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention to that unless otherwise specified.

  An embodiment in which the present invention is applied to a double facer gluing device will be described with reference to FIGS. 1 and 2, in the gluing device 10 of this embodiment, a gluing liquid g made of starch paste is stored in the gluing liquid tank 12, and a part of the gluing roll 14 is immersed in the gluing liquid g. The gluing roll 14 rotates in the direction of the arrow about the rotation shaft 16. A pair of fixed glue dams 18 a and 18 b are provided below the glue roll 14, and the glue dam adhering region in the longitudinal axis direction of the glue roll 14 is regulated by the glue dam.

  A doctor roll 20 that regulates the film thickness of the glue film attached to the glue roll 14 is provided opposite to the glue roll 14 and rotates in the direction of the arrow. The gluing roll 14 and the doctor roll 20 are arranged such that their axes are parallel to each other. On the other hand, a rider roll 22 is opposed to the gluing roll 14. The gluing roll 14 and the rider roll 22 rotate in the direction of the arrow, respectively, and send the single-sided cardboard sheet k passing between these rolls in the direction of the arrow, and apply the glue solution g to the top of the single-sided cardboard sheet k.

A gap δ ₁ is provided between the glue roll 14 and the doctor roll 20, and the paste liquid g passes through this gap δ ₁ , whereby a uniform glue film having a film thickness δ ₁ is formed on the outer peripheral surface of the glue roll 14. It is formed. And the amount of paste liquid according to this film thickness is apply | coated to the step top part of the single-sided cardboard sheet k. The doctor roll 20 can be moved back and forth with respect to the gluing roll 14 by an eccentric cam mechanism 24. Thus, it is possible to adjust the distance [delta] _1.

Further, a production management device 25 that manages the overall operation of the corrugated board manufacturing device is provided. This production management device 25 controls the drive mechanism 26 of the base 42 described later to control the position of the base 42 in the axial direction (direction of arrow a in FIG. 2) and the eccentric cam mechanism 24 to adjusting the [delta] _1.

  A doctor blade 28 is opposed to the doctor roll 20. The doctor blade 28 has a function of scraping off the glue liquid on the surface of the doctor roll adhering at the nip portion with the gluing roll 14 and preventing the glue liquid from entering the nip portion between the gluing roll 14 and the doctor roll 20. . The doctor blade 28 is fixed to the base 30. The base 30 is mounted on a support frame 32 so as to be rotatable about a rotation center O. A coil spring 34 is installed between the support frame 32 and the base 30, whereby the doctor blade 28 is pressed with an elastic force set on the outer peripheral surface of the doctor roll 20.

  Further, as shown in FIG. 2, a pair of weir plates 38 a and 38 b are arranged in series in the axial direction of the gluing roll 14 above the liquid surface of the gluing liquid g and upstream of the doctor roll 20 in the rotation direction. ing. A pair of elastic scrapers 40 a and 40 b are arranged in series in the axial direction of the gluing roll 14 on the downstream side in the rotation direction of the weir plates 38 a and 38 b and on the upstream side of the doctor roll 20. The dam plates 38 a and 38 b are fixed to the base 42. An arm 44 is mounted on the base 42 so as to be rotatable about a support shaft 46.

  Elastic scrapers 40 a and 40 b are fixed to the tip of the arm 44, and the other end of the arm 44 is supported on the base 42 via a coil spring 48. Thus, the elastic scrapers 40 a and 40 b are pressed against the surface of the gluing roll 14 with a light pressing force by the elastic force of the coil spring 48. At least the tips of the elastic scrapers 40a and 40b are made of an elastic body such as hard rubber or urethane so as not to damage the surface of the gluing roll 14. When the elastic scrapers 40a and 40b are made of urethane, particularly the glue film on the gluing roll can be scraped cleanly.

The material of the weir plates 38a and 38b may be hard and rigid, and may be made of steel, for example. In particular, a product made of Teflon (registered trademark) having a small friction coefficient is advantageous because it is difficult for the paste to adhere. During the weir plate 38a, 38b and the glue roll 14 is always maintained in _two regular intervals [delta]. The interval δ ₂ is in the relationship of δ ₁ <δ ₂ with the interval δ ₁ . During the operation of the double facer, the interval δ ₁ is 0.05 to 0.5 mm (usually 0.2 to 0.3 mm), and the interval δ ₂ is desirably 1 mm or less at the maximum.

  Both the weir plates 38 a and 38 b and the elastic scrapers 40 a and 40 b are supported by the base 42. Therefore, the axial relative positions of the weir plate 38a and the elastic scraper 40a are fixed. Since the base 42 is movable in the axial direction by the drive mechanism 26, the dam plate 38a and the elastic scraper 40a are movable in the axial direction while maintaining a fixed relative position. The dam plate 38b and the elastic scraper 40b have the same fixed relative positional relationship.

In such a configuration, the glue liquid g stored in the glue liquid tank 12 is applied to the outer peripheral surface of the gluing roll 14. Applied to the glue roll 14 was Norimaku _{g f} is weir plate 38a, passes through the 38b, is subjected to leveling prior film thickness of [delta] _2. As shown in FIG. 2, the area preliminarily leveled by the dam plates 38 a and 38 b is the area A (m + L) in the inner area of the paper edge w of the single-sided cardboard sheet k. The area m is an estimated protrusion area estimated by the difference between the set film thickness δ ₁ and the average film thickness δ _2, and is usually 2 to 4 mm. The region L actually requires a minimum of 15 mm, and is preferably 25 mm or more.

Sheathing board 38a, Norimaku _{g f} passing through the 38b is elastic scraper 40a, reaches the 40b, the elastic scrapers 40a, glue film _{g f} is scraped off by 40b. The paste removal area is an area B including the paper edge w and the inner area of the paper edge w.
It should be noted that the paste removal area B needs to be not less than the estimated protrusion area m and to the inside from the paper edge w.

In this embodiment, leveling since the thickness [delta] ₂ to a constant value, set to run over the width of the thickness [delta] ₁ and paste solution after passing through the doctor roll, will have a unique correlation. Therefore, according to the set film thickness [delta] _1, and to adjust the estimated outside area m.
Thus, the weir plate 38a, 38b and elastic scrapers 40a, Norimaku _{g f} passing through the 40b by passing through the doctor roll 20, is adjusted to the thickness [delta] _1, then, the glue roll 14 and the rider roll 22 At the nip, the paste is applied to the top of the single-sided cardboard sheet k.

As shown in FIG. 3A, the elastic scrapers 40 a and 40 b are in contact with the surface of the gluing roll 14 with an angle of attack α with respect to the tangent line s of the gluing roll 14. This is referred to herein as “line contact”. This makes it possible to scrape off substantially all the Norimaku g _f adhered to glue roll 14. The angle of attack α is preferably 30 ° ≦ α ≦ 60 °. The angle of attack α by this range can substantially reliably removed Norimaku g _f.

FIG. 3B shows a configuration of an elastic scraper 50 as a comparative example. This elastic scraper 50 has an angle of attack α of zero with respect to the tangent s of the gluing roll 14 at the contact point C with the gluing roll 14. Therefore, the surface pressure of the glue film g _f is generated in the direction of arrow b at the contact point C, the tip portion of the elastic scraper 50 is pushed by the surface pressure, it can scrape all the glue film g _f at the point of contact C Can not.

According to the present embodiment, by performing the pre-equalization step by the dam plates 38a and 38b on the upstream side of the doctor roll 20, it is possible to easily predict the protrusion width of the paste liquid from the paper edge w after passing through the doctor roll. It becomes like this. Next, in the glue solution removal step, the estimated protrusion width m is estimated from the paper edge w of the paste liquid, and the glue liquid removal area B that is equal to or larger than the estimated protrusion area m is set to include the paper edge w and to the inside of the paper edge w. and elastic scrapers 40a, by 40b, by removing the Norimaku g _f from該糊fluid removal region B, can be reliably prevented protruding from the paper edge w of size liquid having passed through the doctor roll 20.

Thus, the sticking out of the paper edge w of the single-sided corrugated cardboard sheet k from the paper edge w can be eliminated, and the cardboard sheet can be prevented from being wrinkled due to the adhesive liquid adhering to the hot plate.
Also, leveling the thickness [delta] ₂ and set the thickness [delta] ₁ is greater than a predetermined value, so that by adjusting the size liquid removal region B in accordance with the set thickness [delta] _1, control for preventing extrusion of the sizing liquid The mechanism can be simplified and prevented at low cost.

  In the above-described embodiment, the pair of weir plates 38a and 38b arranged in the axial direction of the gluing roll 14 is used, but instead, one piece of the gluing roll 14 arranged over the entire width in the axial direction. A dam plate may be provided.

  In the above embodiment, the present invention is applied to a gluing device that applies a glue solution to the top of the single-sided corrugated cardboard sheet k in a double facer. However, the present invention is a double facer that applies a glue solution to a front liner. The present invention can also be applied to a gluing device that applies a glue solution to the top of the core with a single facer.

  According to the present invention, in the gluing device of the corrugated board manufacturing apparatus, the sticking liquid can be reliably prevented from protruding from the end of the paper, so that the quality deterioration of the corrugated board sheet due to the sticking liquid sticking out can be eliminated.

DESCRIPTION OF SYMBOLS 10,100 Gluing apparatus 12,102 Glue tank 14,104 Gluing roll 16,106,110 Rotating shaft 18a, 18b, 112 Glue dam 20,108 Doctor roll 22 Rider roll 24 Eccentric cam mechanism 25 Production management apparatus 26 Drive apparatus 28 Doctor blade 30, 42 Base 32 Support frame 34, 48 Coil spring 38a, 38b Dam plate 40a, 40b, 50 Elastic scraper 44 Arm 46 Support shaft A Pre-equalization area B Glue solution removal area C Contact point m Estimated protrusion area g Glue liquid g _f glue film g _s glue liquid surface k single-sided cardboard sheet s tangent t ₁ , t ₂ glue edge w paper edge

Claims (5)

Paper that forms part of the corrugated sheet after the paste roll is partly immersed in the paste liquid stored in the paste tank and the paste liquid adhering to the paste roll is adjusted to a set film thickness by a doctor roll. In the gluing method of the corrugated board manufacturing apparatus that is to be transferred to the web,
On the upstream side of the doctor roll, a pre-equalization area is set in which the paste liquid is transferred to the inner area from the paper edge including the paper edge of the paper web out of the glue liquid adhering to the gluing roll. A pre-equalization step for adjusting the average film thickness to be larger than the set film thickness;
On the downstream side of the pre-equalizing step, of the pre-equalized area, including the paper edge of the paper web, from the paper edge to the inner area, the estimated protrusion width estimated from the difference between the set film thickness and the average film thickness A paste liquid removal step of setting a paste liquid removal area and removing the paste liquid from the paste liquid removal area;
After該糊liquid removing step, the NorimakuAtsu adjustment step of adjusting the size liquid on glue roll set film thickness by the doctor roll, Ri Tona,
The uniform film thickness is set to a constant value larger than the set film thickness, and the paste liquid removing region is adjusted according to the set film thickness, and the paste liquid is transferred to the paper web after transfer of the paste liquid to the paper web. A gluing method for a corrugated board manufacturing apparatus, characterized in that it is prevented from protruding from the cardboard . A single facer facer method gluing cardboard manufacturing apparatus according to claim 1, wherein the paper web is corrugated medium. A facer is double facer, a method gluing cardboard manufacturing apparatus according to claim 1, wherein the paper web is Katadan ball seat. A paste tank that stores the paste, a glue roll that is partially immersed in the paste and adheres to the surface, and a doctor roll that adjusts the glue applied to the glue roll to a set film thickness; With
In the gluing device of the corrugated board manufacturing apparatus in which the paste liquid on the gluing roll adjusted to the set film thickness is transferred to the paper web constituting the corrugated board sheet,
Of the glue liquid adhering to the glue roll on the upstream side of the doctor roll, a pre-equalized area where the glue liquid is transferred to the inner area from the paper edge including the paper edge of the paper web is larger than the set film thickness. And a weir plate to adjust the film thickness,
The difference between the set film thickness and the average film thickness from the paper edge to the inner area, including the paper edge of the paper web, in the pre-equalization area at the downstream side of the barrier plate and the upstream side of the doctor roll. a scraper for removing the size liquid from the set size liquid removal area so that the estimated protruding width or deduced from, provided with,
The uniform film thickness is set to a constant value larger than the set film thickness, the set film thickness is input, the paste liquid removal area is adjusted according to the set film thickness, and the paste is transferred after the paste liquid is transferred to the paper web. A gluing device for a corrugated board manufacturing apparatus, comprising a controller for adjusting the liquid so that it does not protrude from the paper edge of the paper web . The scraper is made of an elastic body, and the tip of the scraper is disposed so as to have an angle of attack with respect to the tangential direction of the gluing roll, and is in line contact with the surface of the gluing roll. The gluing apparatus of the corrugated board manufacturing apparatus of Claim 4 .

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