JPH08267620A - Gluing method in corrugating machine - Google Patents

Abstract

PURPOSE: To obtain a gluing method for reducing warpage of a corrugated sheet, for uniformly applying a glue to a center part and both ends, for adjusting contact points of top parts of a corrugation of a corrugated sheet with a gluing roll in accordance with the running speed of the corrugated sheet for performing an optimum gluing in accordance with the running speed. CONSTITUTION: In a gluing method in a corrugating machine, a corrugated sheet A is wound along a presser roll 5 at an angle so as to be pressed flat in the width direction thereof. While the corrugating sheet is pressed against a gluing roll 8 by the presser roll 5, the gluing roll 8 is abutted against the top parts of the corrugation of the corrugated sheet for applying a glue thereto. The gluing roll 8 can move forward and backward in the feed direction of the corrugated sheet in accordance with the running speed of the corrugated sheet. The contact points of the top parts of the corrugation of the corrugated sheet with the gluing roll 8 are controlled to be decreased at the time of a low-speed operation and increased at the time of a high-speed operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gluing method in a corrugating machine which is a papermaking machine for continuously producing corrugated board sheets.

[0002]

2. Description of the Related Art FIG. 3 is a side view of a conventional double facer. As shown in FIG. 3, a single-faced corrugated fiberboard sheet 40 made of a single facer has a corrugated core paper having a weight roll 41 at the top. While being pressed against the glue roll 43 side of the machine 42, the starch roll 4 is pressed by the glue roll 43.
After 4 is applied, it enters the double facer 45. on the other hand,
The liner 46 is preheated by the preheater 47 and similarly enters the double facer 45. The single-faced cardboard sheet 40 and the liner 46, which have entered the double facer 45, have a belt 51 driven by a roll 50 and a heating plate 5 in a heater section 48.
It is sandwiched between the two, and is further transferred while being pressurized by a weight roll 53 arranged on the back surface side of the belt 51. As a result, a bonding pressure is applied to the double-sided corrugated board sheet 55 and the heating of the heater section 48 is promoted.

When the single-sided corrugated board sheet 40 and the liner 46 pass through the heater portion 48, the attached starch paste 44 is gelatinized by the heating of the heating plate 52 having high-temperature steam inside, and the single-sided corrugated board sheet 40. The stepped portion of the wavy core paper and the liner 46 are bonded to each other to form the double-faced corrugated fiberboard sheet 55. The double-faced corrugated cardboard sheet 55 is carried out in the subsequent cooler section 56 while being sandwiched between the belt 51 and the lower belt 57, and sent to the next step. Also, FIG.
Is a side view for explaining the conventional gluing method. As shown in the figure, the glue roll 43 of the glue machine 42 is in contact with a doctor roll 49 located above the glue tank surface to scrape off excess glue. The amount of glue adhered to the glue roll 43 is adjusted so that the corrugated core of the single-sided corrugated sheet 40 is pressed against the glue roll 43 side of the glue machine 42 by the weight roll 41 while the glue roll is pressed. The starch paste is applied by 43.

[0004]

By the way, in the gluing method as described above, when the one-sided corrugated cardboard sheet 40 is warped as shown in FIG. 5, when the weight roll 41 presses it against the glue roll 43 side. , Single-sided corrugated sheet 4
A suitable amount of glue is applied to the central portion of 0, but an appropriate amount or more of glue is applied to both ends, and there is a problem that the finished double-faced corrugated cardboard sheet is warped and defective products are produced.

Therefore, an object of the present invention is to provide a gluing method in a corrugated machine in which the corrugated cardboard sheet is less warped and the glue is uniformly applied to both the central portion and both ends. .

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and a corrugated cardboard sheet is wound around a press roll at an angle to such an extent that the width direction becomes flat, and the corrugated cardboard is pressed by the press roll. While pressing the sheet to the glue roll side, the glue roll is brought into contact with the corrugated sheet corrugated sheet top portion and glued, and according to the traveling speed of the corrugated board sheet, the glue roll can be moved forward and backward with respect to the conveyance direction of the corrugated board sheet. This reduces the number of contact points between the glue roll and the corrugated sheet corrugated sheet top during low speed operation, and increases the number of contact points between the glue roll and corrugated cardboard sheet corrugated sheet top during high speed operation. The attachment method. In addition, the corrugated cardboard sheet is wound around the pressing roll at an angle until it becomes flat in the width direction, and while pressing the corrugated cardboard sheet to the glue roll side with the pressing roll, bring the glue roll into contact with the corrugated sheet corrugated top. Along with gluing, by allowing the pressing roll to advance and retreat in the transport direction of the corrugated cardboard sheet according to the traveling speed of the corrugated cardboard sheet, the contact points between the gluing roll and the corrugated sheet corrugated top are reduced during low-speed operation, The gluing method in a corrugated machine is controlled so that the number of contact points between the gluing roll and the corrugated sheet corrugated sheet is increased during high-speed operation.

[0007]

According to the above construction, the corrugated board sheet is wound around the pressing roll at an angle to the extent that the width direction becomes flat, and the glue roll can be moved back and forth in the conveying direction of the corrugated board sheet according to the traveling speed of the corrugated board sheet. By lowering the contact point between the glue roll and the corrugated top of the corrugated sheet during low-speed operation, the glue roll is retracted in the corrugated-cardboard conveying direction during high-speed operation. It is moved forward to control so as to increase the contact points between the glue roll and the corrugated sheet corrugated sheet top. In addition, by corrugating the corrugated cardboard sheet at an angle to the extent that the width direction becomes flat and winding the corrugated cardboard sheet in the pressing roll, and by allowing the pressing roll to advance and retreat in the corrugated cardboard sheet conveying direction according to the traveling speed of the corrugated board sheet,
During low speed operation, the press roll is moved forward in the cardboard sheet conveying direction to reduce the contact points between the glue roll and the corrugated sheet corrugated top, and during high speed operation the press roll is retracted in the cardboard sheet conveying direction. The number of contact points between the glue roll and the corrugated sheet corrugated top is controlled to increase.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a gluing method in a corrugating machine according to the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a laminating step portion of a corrugated machine to which the present invention is applied. As shown in the figure, a single-faced corrugated sheet A made of a single facer passes through a roll 2 and a stepped preheater 3 It is heated by, and is wound around the weight roll 5 with an angle so that the width direction becomes flat.

The step top of the single-faced corrugated board sheet A wound around the weight roll 5 is glued by a glue roll 8 which is partially immersed in the glue of the glue pan 7 of the glue applying device 6. The glue roll 8 is contacted with a doctor roll 9 located above the glue pan surface to scrape off excess glue and remove the glue roll 8.
The amount of glue adhered to is adjusted. The glue pan 7 is supported rotatably in the vertical direction by the frame 10 through the pins 4 in the front with respect to the sheet conveying direction, and the glue pan 7 has a box body 11 in which an upper portion of the glue roll 8 is opened. Is supported slidably in the front-rear direction with respect to the sheet conveying direction, the glue roll 8 and the doctor roll 9 are rotatably supported by the box body 11, and the box body 11 is moved forward by a stopper 12. It is being blocked. A glue unit 13 is configured from the glue pan 7, the glue roll 8, the doctor roll 9, and the box 11.

The tip end of the cylinder rod 14 is rotatably supported on the rear side of the box body 11 with respect to the sheet conveying direction via a pin, and the base end portion of the cylinder rod 14 is inside the cylinder 15. The cylinder 15 is inserted so as to be movable back and forth in the sheet conveying direction, and the cylinder 15 is fitted with the glue pan 7 via a bracket.
It is fixed to. Further, the tip of the cylinder rod 18 is rotatably supported at the lower end on the rear side of the glue pan 7 with respect to the sheet conveying direction via a bracket and a pin, and the base end of the cylinder rod 18 is vertically moved in the cylinder 19. The cylinder 19 is inserted so as to be movable back and forth, and the base end of the cylinder 19 is rotatably supported by the frame 10 via a pin. The glue unit 13, the cylinder rod 14, the cylinder 15, the cylinder rod 18, and the cylinder 19 constitute the glue device 6.

The single-sided corrugated board sheet A glued by the gluing roll 8 is sprayed with steam in the shower box 21 provided in the vicinity of both sides of the corrugated board sheet, and is wound around the roll 24.

On the other hand, the liner B is heated by a stepped preheater 27 via a roll 26, is wound on a roll 28, and is provided with a shower box 3 near both sides of the liner.
At 0, steam is injected and the roll 31 is caught.

Then, the glued step top portion of the single-sided corrugated board sheet A and the liner B are adhered to each other to form the double-sided corrugated board sheet 32. The double-faced corrugated cardboard sheet 32 is conveyed by the campus belt 36 wound around the roll 35 of the double flute facer 33, heated by the heating plate 38, and sent to the next step.

Since this embodiment has the above-mentioned structure, when the single-faced corrugated board sheet A and the liner B are conveyed at a relatively high speed, the single-faced corrugated board sheet A as shown in FIG. Is wound around the weight roll 5 at an angle until the width direction becomes flat, the cylinder 19 is operated to retract the cylinder rod 18, and the glue unit 1
3 is rotated upward to move it to a predetermined position in the direction of arrow E, and then the cylinder 15 is operated to operate the cylinder rod 1
4 is advanced and the box 11 and the glue roll 8 are moved in the direction of arrow F to a predetermined position in the front with respect to the sheet conveying direction, a plurality of step tops (for example, 4
The individual step tops) come into contact with the glue roll 8, and the glue can be surely adhered to the glue roll 8 at a large number of contact points even at high speed operation.

At this time, even the single-faced corrugated cardboard warped in the width direction is passed through the weight roll 5 while being angled to such an extent that the width direction becomes flat, so that the paper is warped, warped, and S-curved. Even a single-sided corrugated sheet in a row is forcibly flattened, and uniform glue can be applied to both ends and the center of the single-sided corrugated sheet.

Also, the single-faced corrugated sheet A and the liner B
2 is conveyed at a relatively low speed, as shown in FIG. 2B, the cylinder 15 is operated to move the cylinder rod 14
When the box 11 and the glue roll 8 are moved backward in the direction of the arrow G to the predetermined position with respect to the sheet conveying direction, for example, one step top portion of the single-sided corrugated cardboard sheet A comes into contact with the glue roll 8. It is possible to attach an appropriate amount of glue without adhering excessive glue even at low speed operation.

Therefore, by moving the glue roll forward and backward in accordance with the traveling speed of the corrugated board sheet, it is possible to adjust the contact point between the corrugated sheet corrugated sheet top portion and the glue roll, and it is possible to perform good gluing. . Also, by moving the glue roll back and forth according to the paper thickness of the corrugated board sheet, the gap between the weight roll and the glue roll can be adjusted to the optimum distance, and the paste is satisfactorily glued according to the paper thickness and the step collapse is also performed. Can be prevented.

Although the glue roll can be moved back and forth in the above embodiment, the weight roll may be moved forward and backward.
Further, in the above-described embodiment, the cylinder is used to move the glue unit and the glue roll, but the present invention is not limited to this, and other driving means using a rack and a pinion, a screw shaft and a motor, etc. may be used. Is. Furthermore, although the gluing method according to the present invention is applied to the production of the double-faced corrugated board sheet in the above-mentioned embodiments, the present invention is not limited to this, and it goes without saying that it may be applied to the production of a double-sided corrugated board sheet.

[0019]

As described above, according to the present invention,
Since the corrugated cardboard sheet is wrapped around the pressing rolls with an angle until it becomes flat in the width direction, even warp, warp, and S-shaped corrugated cardboard sheets are forced to be flat surfaces, and both ends of the corrugated sheet corrugated top are It is also possible to apply glue evenly on the central part. Also, by allowing either the glue roll or the pressing roll to move back and forth in the cardboard sheet transport direction depending on the traveling speed of the cardboard sheet, the glue roll and the corrugated sheet corrugated sheet top contact during low speed operation. The number of points is reduced and the contact points between the glue roll and the corrugated sheet corrugated sheet are controlled to increase during high-speed operation, so the optimum contact point between the corrugated sheet corrugated sheet coronary sheet and the glue roll is adjusted according to the running speed. It is possible to
Good gluing can be performed and quality can be improved. Further, by making either one of the glue roll and the pressing roll forward and backward with respect to the conveyance direction of the corrugated cardboard sheet depending on the paper thickness of the corrugated cardboard sheet, when the paper thickness is thick, If the distance is wide and the paper thickness is thin, the distance between the press roll and the glue roll can be narrowed to adjust to the optimum distance according to the paper thickness, and good gluing and surely preventing step collapse can be achieved. be able to.

[Brief description of drawings]

FIG. 1 is a side view showing a bonding step portion of a corrugated machine to which a gluing method according to the present invention is applied.

FIG. 2 is an explanatory view showing a gluing method according to the present invention,
(A) is a side view showing the positional relationship between the glue roll and the weight roll during high-speed operation, and (b) is a side view showing the positional relationship between the glue roll and the weight roll during low-speed operation.

FIG. 3 is a side view of a double facer to which a conventional gluing method is applied.

FIG. 4 is a side view illustrating a conventional gluing method.

5 is a view taken along line XX in FIG.

[Explanation of symbols]

 A Single-sided corrugated sheet B Liner 3 Step preheater 5 Weight roll 6 Gluing device 7 Glue pan 8 Glue roll 9 Doctor roll 10 Frame 11 Box body 12 Stopper 13 Glue unit 14 Cylinder rod 15 Cylinder 18 Cylinder rod 19 Cylinder 27 Stepped preheater 21,30 shower box

Claims (2)

[Claims] 1. A corrugated cardboard sheet is wound around a pressing roll with an angle until it becomes flat in the width direction, and while pressing the corrugated cardboard sheet toward the adhesive roll side with the pressing roll, the adhesive roll is applied to the corrugated cardboard top portion. In addition to contacting and gluing, the glue roll can be moved back and forth with respect to the corrugated board transport direction in accordance with the traveling speed of the corrugated board sheet, so that the contact point between the glue roll and the corrugated sheet corrugated top portion during low speed operation can be improved. The method of gluing in a corrugating machine is characterized in that the number of contact points between the glue roll and the corrugated sheet corrugated sheet is controlled to be increased during high-speed operation. 2. A corrugated cardboard sheet is wound around a pressing roll with an angle until the width direction becomes flat, and while pressing the corrugated cardboard sheet toward the glue roll with the pressing roll, the corrugated sheet roll is pressed against the top of the corrugated sheet. In addition to contacting and gluing, the press roll can be moved back and forth in the corrugating direction of the corrugated sheet according to the traveling speed of the corrugated cardboard sheet, so that the contact point between the glue roll and the corrugated sheet corrugated top can be reduced during low speed operation. The method of gluing in a corrugating machine is characterized in that the number of contact points between the glue roll and the corrugated sheet corrugated sheet is controlled to be increased during high-speed operation.