JPH064148B2 - Adhesive application method and device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a method and apparatus for applying an adhesive to a web of sheet material so that they are adhered to each other, and in particular to folds of single face members. It relates to a method and a device in which the amount and position of the adhesive applied to the flute) is controlled very accurately.

2. Description of the Related Art Conventional Problems and Problems The adhesive is applied to folds formed on a plurality of corrugated single-sided members, which are intermediate materials of corrugated paper, and these single-sided members are overlapped with each other in a relational state. Also, conventional machines for adhering to surface materials to form sheets of corrugated paper use applicator rolls to apply adhesive to the folds. Also, in the assembly machine one or more belts are brought into a relationship where the single face members are superposed and bonded. The belt pulls the single-sided member through the applicator roll and through the assembler. The belt of the assembler is supported and moved by the drum. Also, the applicator rolls are usually driven by a direct drive between any of the drums and the rolls. Usually one drum carries the sprockets chained to the input sprockets going to the distributor, the sprockets carried by the individual applicator rolls being chained to the output sprockets from the distributor. It is. Therefore, the rotation of the drum of the assembler causes the applicator roll to rotate, and the device also has a predetermined fixed mechanical relationship between the rotational speed of the applicator roll and the rotational speed of the drum. Is configured to.

A drawback of prior art adhesive applicators is that the ratio between the rotational speed of the drum of the assembler and the rotational speed of the applicator roll cannot be easily changed. Due to the direct drive between the drum and roll via the chains and sprockets, changing the speed ratio of these requires a tedious procedure of changing the distributor input sprockets. However, changing the distributor input sprocket only works to change the speed ratio between the drum and each roll to the same extent. It is not possible to change the speed ratio between the drum and each of the individual rolls to the chosen degree. Because this is achieved only by changing the sprockets attached to the roll. Also, prior art devices are not considered changeable because the sprockets of the applicator roll cannot be easily replaced. Once selected instead, the sprocket of the applicator roll will not normally be replaced unless it must be replaced due to wear.
In addition, the applicator rolls normally move at the same peripheral speed of all applicator rolls regardless of the rotation speed of the drum of the assembling machine, and the input sprocket of the distributor must be replaced by the peripheral speed of each applicator roll. It only works as a constant change.

The theoretical principle of rotating the applicator rolls by direct drive between the rolls and the belt drum of the assembler is the peripheral speed of the rolls and the movement of the single-sided member as it is pulled across those rolls. It consists in obtaining a direct correlation with the speed. The belt of the assembler, which is attached to or driven by the drum of the assembler, pulls the single face member across the circumference of the roll, so theoretically the speed of movement of the single face member and the rotation of the drum. It can be assumed that there is a known direct correlation between speed and hence a known direct correlation between the speed of movement of the single face member and the peripheral speed of the roller. However, this assumption neglects the actual slippage between the belt on the drum and the single-sided member on the belt and this technique cannot be considered. Normally, the distributor input sprocket is pre-loaded between the peripheral speeds of the single face member and the output roll such that the roll peripheral surface moves a little slower than the single face member to wipe across, or wipe, the folds. Although it is designed to obtain a defined relationship state, this relationship cannot be maintained because slippage occurs.

Prior art machines precisely control the speed of rotation of the applicator roll relative to the speed of movement of the single-sided member moving across the roll circumference and also allow for differences in the shape of the folds and their identity. In order to compensate, the speed relationship between the single face member and the roll peripheral surface for each applicator roll is controlled independently and accurately. As a result, excess adhesive is applied to the folds to ensure that the single-sided members can be properly bonded to each other, even if the adhesive applied to the folds is misaligned. . This is accomplished by using an applicator roll with a smooth or porous peripheral surface, and also to transfer it to the folds of the single-sided member, leaving a layer of adhesive of selected thickness on the peripheral surface. In order to achieve this, it is achieved by using a metering roll for adjusting the amount of adhesive taken up by the applicator roll.
However, water occupies a significant portion of the adhesive, and the folds are excessively moist as a result of not only wasting the adhesive but also depositing an excessive amount of adhesive on the folds. It will end up. To bond the single-sided members together, the adhesive must be dried on the assembly machine,
The more moisture that is applied to the folds, the more heat energy is needed to cure the adhesive.
More importantly, the finished corrugated cardboard is warped as a result of excessive wetting of the folds, and the outer surface,
That is, "ribbing" occurs on the surface. These make it extremely difficult, if not impossible, to make high quality or graphic printing impossible on the surface.

OBJECT OF THE INVENTION It is an object of the present invention to provide an improved apparatus and method for applying adhesive to the pleats of a plurality of single faced members of corrugated intermediate material. In this, the actual speed of movement of a single-sided member through the device is directly sensed, and multiple adhesives are used to control the amount and location of adhesive applied to the folds. The speed of travel is used to independently control the rotational speed of each of the agent applicator rolls.

Another object of the invention is that the detected speed of movement of the single-sided member selectively causes the adhesive to be more or less selective with respect to the top, leading edge or trailing edge of the folds formed on each of the single-sided members. It is an object of the present invention to provide an apparatus and method as described above adapted to be used to variably and independently control the rotational speed of each applicator roll for application.

Another object is that controlling the speed of rotation of the applicator roll relative to the speed of movement of the web significantly reduces the amount of adhesive needed to properly bond one face member to another. To provide an apparatus and method as described above.

Yet another object is to substantially eliminate the curling of finished corrugated cardboard and the "waviness" of its smooth surface by reducing the amount of adhesive used and hence the moisture applied to the folds. To provide an apparatus and method as described above.

Yet another object is to provide an apparatus and method as described above in which the size of the nip through which the single face member formed between the applicator roll and its associated weight roll is automatically detected and controlled. Is to provide.

SUMMARY OF THE INVENTION According to the present invention, an apparatus for applying adhesive to the folds of a plurality of corrugated webs applies the adhesive to a plurality of adhesive applicator rolls and the peripheral surface of the applicator rolls. And means for moving each web across the perimeter of one applicator roll that is assembled by pressing the fold against the perimeter to attach the adhesive from the perimeter to the perimeter. , A means for moving a plurality of webs at the same same moving speed, a means for detecting an actual moving speed of the plurality of webs, an amount and an application position of an adhesive applied to the folds of each web In order to control the rotation speed of the roll, the rotation speed is independent of the rotation speed of the other rolls, and is not restricted by the change in the detected actual moving speed of the web. And u The web is rotated to rotate each applicator roll at a rotational speed that is varied as necessary to maintain a constant and each selected and adjustable relationship with the detected actual travel speed of the web. And means for responding to the detected actual speed of movement of the.

The present invention also contemplates a method of applying an adhesive to the folds of a plurality of corrugated webs, the method comprising the steps of applying an adhesive to the circumferential surface of a plurality of applicator rolls, A consistent and equal speed such that each web is moved across the perimeter of one applicator roll that mates by pressing the fold against the perimeter to apply adhesive from the perimeter to the perimeter. In order to control the amount and position of the adhesive applied to the folds of each web, and the steps of moving the webs to detect the actual moving speeds of the webs. Between the peripheral speed of the roll and the detected actual moving speed of the web, without being restricted by the change in the detected actual moving speed of the web. Each selected One adjustable relationship status at a rotational speed is changed if necessary to maintain a constant, comprising the steps of rotating each applicator roll according to the actual moving speed is web detected, the.

Description of Embodiments FIG. 1 shows pleats 22a-2 formed on corrugated webs 24a-24c, which are single-sided members of an intermediate material of cardboard paper.
Numeral 20 for applying an adhesive to 2c and for arranging the single-sided members in a state of being overlapped with each other so as to form a corrugated cardboard 26 to be bonded and united with each other. 1 shows the device shown. The actual speed of movement of the cardboard, and therefore of the single-sided member, is to be continuously detected and monitored directly by the friction wheel 28 in contact with the upper surface of the cardboard. The wheel is connected to a tachometer 30, which produces a signal whose value depends on the detected web speed and which is provided to both a programmable microprocessor 32 and a motor speed controller 34. . The motor speed controller and the microprocessor are connected to each other. The motor speed controller is connected to the plurality of DC motors 36a to 36c. Each of these motors rotates a respective one of a plurality of engraved or porous surfaced adhesive applicator rolls 38a-38c. Weight rolls 40a to 40c for each of the applicator rolls
Are combined to form a nip. Further, these motors are provided in the adhesive application station 42 together with the applicator roll and the weight roll.

The single-sided members 24a-24c are associated with guide rolls 44a-44c and 4 from their supply (not shown).
6a to 46c, and extend from these guide rolls to respective applicator rolls 38a to 38c.
c and weight rolls 40a-40c extending through the nip. The single face folds 22a-22c contact the peripheral surface of the applicator roll and pass through the nip, which causes the applicator roll to apply adhesive to the fold. The single face members from the applicator roll are brought together in a superposed relationship between a pair of endless belts 48 and 50 of the assembler. The belt 48 is supported by being rotated around a pair of drums 52a and 52b. The belt 50 is supported by being rotated around a pair of drums 54a and 54b. Means are also provided, not shown, for rotating these drums at a selected speed to move the belts. These belts form the conveyor means for the single face members 24a-24c,
Also, pull the single face member through the device and across the applicator roll. A paper sheet intermediate material, that is, a surface material 56 extends between these belts and below the lowermost single-sided member 24c. This surface material 5
6 is supplied from the supply part (not shown). In this way, the single face member and face member are placed on top of each other and selected by the belt through the dryer station 58 of the assembler, which cures the adhesive and causes the composite cardboard or triple face member 26. Is formed.

The amount and position of the adhesive applied to the folds 22a to 22c are determined according to the moving speed of the single-sided member with respect to the peripheral speed of the applicator rolls 38a to 38c to be combined. If the moving speed of the single-sided member is equal to the peripheral speed of the applicator roll, then the adhesive is applied to the top of the folds. If the peripheral speed of the applicator roll is slower or faster than the speed of movement of the single-sided member, a fold wiping action will occur across the applicator roll and more or less adhesive will be applied to the front or rear edges of the fold. Will be.

According to conventional actual operation, single-sided members 24a-24c
In an attempt to control the peripheral speed of the applicator roll with respect to the speed of travel of the applicator roll, the speed of travel of the single faced member is the same as the belt speed because the belts 48 and 50 of the imposing machine pull the single faced member through the machine. Was assumed to be. This assumption also applies to drums 52a-52b and 54a.
Since the belt moves over .about.54b, the rotation speed of the drum was considered to directly respond to the movement speed of the belt. Therefore, in the prior art practice, the sprocket of one drum is chained to the input sprocket to the distributor and the output sprocket of the distributor is also chained to each applicator roll 38a.
It was thought to connect to the sprockets carried by ~ 38c. The distributor input sprocket determines the rotational speed of the applicator roll relative to the drum and, ideally, the peripheral speed of the applicator roll relative to the speed of travel of the single face member. However, in practice, the belt of the imposing machine causes a slip on the drum, causing a change in the moving speed of the single-sided member with respect to the peripheral speed of the applicator roll, and therefore the amount of adhesive applied to the fold And, there was a change in the coating position.

Furthermore, in the practice of the prior art, the speed of rotation of the applicator roll is the same. Therefore, even if the moving speed of the single-faced member relative to the peripheral speed of the applicator roll can be kept constant, the applicator rolls cannot rotate at different speeds, so that the difference in the fold shape or the individual single-faced member It is not possible to compensate for the adhesive application in view of the difference in density. Therefore, in order to ensure proper adhesion of the single-sided members to each other despite the inability to control the application of the adhesive in response to differences in adhesive application or differences in density, The prior art also intended that an excessive amount of adhesive was applied to the folds. However, since most of the adhesive is water, and the water must be evaporated at the drying station 58 in order to cure the adhesive, it is a waste of adhesive that the excess amount of adhesive is applied to the folds. Not only is it used, but it also increases the energy required for drying. More importantly, and the biggest drawback is that an excessive amount of water applied to the folds as an adhesive causes the finished cardboard paper 26 to warp, causing "waviness" on the paper surface.
Will occur. Therefore, instead of being smooth, the surface of the cardboard becomes a shape influenced by the folds located on the lower side, and it is extremely difficult to perform high quality printing or graphic printing on the paper surface, if not impossible. It becomes difficult.

In order to overcome the drawbacks of prior art adhesive applicators, according to the invention, each applicator roll is rotated individually, the rotational speed of which is carried by its peripheral speed across its peripheral surface. It is controlled so that it is always held so as to maintain the individually selected relationship with respect to the actual moving speed of the single-sided member. This is placed in contact with the surface of the cardboard paper 26 of the triple-faced member in the assembling machine or when leaving the tachometer 3
This is achieved by providing a zero friction wheel 28. This allows the actual speed of movement of the single face member to be continuously detected and monitored. Also, this tachometer generates a signal having a value according to the moving speed of the single-sided member,
The signal is provided to the microprocessor 32 and the motor speed controller 34. In addition to controlling the operating speed of the motors 36a-36c, the motor speed controller controls the rotational speed of at least one of the motors, such as the motor 36b, and thus the peripheral speed of the adhesive applicator roll 38b. It receives a signal with a corresponding value and gives it to the microprocessor. The microprocessor compares the signals representing the speed of the single face member and the motor, and based on that comparison, and also for each individual single face member, adhesive is applied primarily to the tip of the fold or the leading edge of the fold. Alternatively, the microprocessor provides a signal to the motor speed controller based on whether it is programmed to sufficiently coat the trailing edge, which causes the controller to drive each motor 36a-36c at an individual speed. Operated independently, the peripheral speed of each applicator roll is equal to the speed of movement of a single-sided member carried across its peripheral surface and is held individually to be faster or slower. With respect to the configuration described, the motor 36a
And 36c may be referred to as motor 36b and may be independently operated at individually controlled speeds having a predetermined relationship to the sensed speed of motor 36b. However, the motor speed controller easily receives signals from each motor that represent its speed and provides these signals to the microprocessor, which causes the microprocessor to control each motor to achieve its actual speed at the desired speed. Can be equal to. Since the applicator roll diameters are known and are usually the same, this configuration allows the rotational speed of each roller to be individually and accurately and variably controlled, which allows the peripheral speed and the peripheral surface to be controlled. A predetermined relationship, or speed ratio, is maintained with the actual speed of the single-sided member moving across it.

Therefore, the device individually controls the rotational speed of each applicator roll in response to the detected actual speed of movement of the single-faced member being conveyed across the perimeter of the applicator roll to provide a single-faced member. By always maintaining a selected relationship between the moving speed of the single-sided member and the peripheral speed of the applicator roll associated therewith, the adhesive to the folds of the single-sided member regardless of changes in the moving speed thereof. It is possible to accurately control the coating amount and the coating position of. Each applicator roll primarily applies adhesive to the fold tip of the associated single-sided member, or
Alternatively, it can be selectively rotated at a speed to obtain a wiping action by the circumferential surface of the applicator roll across the folds to apply more or less adhesive to the leading or trailing edges of the folds. In order to obtain proper adhesion of single-sided members,
Since the amount and location of the adhesive applied to the pleats will vary depending on the size and shape of the pleats and the density of the material forming the single faced member, and the amount and location thereof will be the rate of movement of the single faced member and This device advantageously compensates and eliminates the adverse effects of such variables, as they vary with variations in the velocity relationship between the peripheral velocities of the mating applicator rolls.
As a result of the precise control over the application of the adhesive, and as will be further explained, the consumption of adhesive can be reduced by up to about 50% compared to the conventional applicator, and the finished cardboard will not warp. It has a very smooth surface and is capable of high quality graphic printing.

Single image member is adhesive applicator rolls 38a-38c
And the weight rolls 40a to 40c are fed through a nip formed between them. The nip is adjusted to have selected dimensions, depending on the thickness and type of single-sided member, so that the adhesive can be properly applied to it without breaking the folds. Although this technique allows for manual adjustment of the nip size, this procedure is generally time consuming and inaccurate. It must be repeated for different single-sided members.

Therefore, in yet another improvement to this technique, the present invention involves adhesive applicator rolls 38a-38c and weight rolls 4.
The automatic adjustment of the nip formed between 0a to 40c is also taken into consideration. Referring to FIG. 2, this drawing shows a device structure for adjusting the nip size between the applicator roll 38b and the weight roll 40b, but a similar structure is used for the applicator roll and the weight roll. It will be appreciated that the weight rolls 40b may be rotatably pivoted at each end of the weight roll 40b, although it will be understood that they may be provided in combination. One end of the arm is connected to the piston rod 62 of the air cylinder 64. This air cylinder either extends the piston rod to move the weight roll away from the applicator roll, or contracts the piston rod to preload the applicator roll with the weight roll. . The other end of the weight roll arm is locked on the extension of the screw actuator 66. This screw actuator is connected to a step motor 70 via a gear box 68. This step motor is operated by the motor controller 72 to raise and lower the screw actuator. The motor controller is also controlled by the microprocessor 32. A displacement transducer 74 is carried on the arm for movement therewith. The displacement transducer includes a target 66 attached to the displacement transducer and the device at a known position with respect to the applicator roll.
A signal is provided to the microprocessor having a value representative of the distance between, and thus the nip size.

The single face member 24b is passed between the weight roll 40b and the applicator roll 38b to be coated with the adhesive. The adhesive is picked up from the adhesive bath 78 onto the applicator roll circumference and applied onto the folds 22b as the folds are transported across the circumference. To adjust the nip size, the displacement transducer 74 provides a signal to the microprocessor 32 that is representative of the nip size. The microprocessor compares the signal representing the nip size to the programmed desired nip size, and if the nip is smaller or larger than the desired size, activates the motor controller 72 to activate the stepper motor 70 and the screw actuator 66. Is driven to move the weight roll up and down in a direction away from or toward the applicator roll, which operation continues until the nip is at the desired size. A convenient way to pass a single-sided member through the nip is that the piston rod is extensible so that the weight roll can be moved away from the applicator roll to expand the nip. During application of the adhesive to the piston rod 62 is completely retracted, so that the nip size is determined only by the extension of the screw actuator 66.

Applicator roll 3 from combined adhesive bath 78
The adhesive picked up by 8a-38c is weighed before being applied to the folds of the single-sided member. First, the metering is done by running a doctor roll against the peripheral surface of the applicator roll so that a thin film of adhesive is left on the peripheral surface. This is done even if the peripheral surface is engraved, i.e. porous, with fine adhesive retaining pockets. In prior art devices,
In order to ensure proper bonding of the single-sided members, it is not possible to precisely control the peripheral speed of the applicator roll with respect to the speed of movement of the single-sided members carried across the peripheral surface of the applicator roll. Had to put a film of adhesive on the perimeter so that an excess amount of adhesive was applied to the folds. However, most of the adhesive is water, and by applying an excessive amount of adhesive to the folds, an excessive amount of water is also applied. As a result of this, in addition to wasting adhesive and increasing the energy required to dry and cure the adhesive, the finished cardboard is warped and the outer surface is The action that causes "swell" works.

Therefore, the present invention contemplates an improved doctor member for metering adhesive on the peripheral surface of an applicator roll. As shown in Figure 3, a doctor blade assembly is associated with each of the applicator rolls, such as roll 38b. The doctor blade assembly includes an air cylinder 80 having a piston rod 82. The piston rod is connected to one end of the arm 84. The other end of the arm is 86
It is rotatably supported by a shaft support portion indicated by. An L-shaped bracket 88 attached to one end of the arm carries a doctor blade 90 at the other end, which is a pair of plates 92 and 9
It is fixed between 4. The inflatable tube 96 acts on the doctor blade to press the blade tip against the peripheral surface of the applicator roll.

In the operation of the doctor, the cylinder 80 moves the tip of the doctor blade 90 against the circumferential surface of the flowing surface when the piston rod 82 is extended and the tube 96 is expanded. Substantially clean adhesive is applied so that behind it only a limited amount of adhesive is carried and retained by the porous peripheral pocket 98. As a result, only the amount of adhesive contained in the pocket can be carried and attached to the folds of the single-sided member, thus limiting the amount of adhesive attached to the folds. Is done. However, the precise control of the peripheral speed of the applicator roll with respect to the speed of movement of the single-sided member results in the adhesive being positioned very accurately at the desired location of the fold, with a minimal amount. Even with this adhesive, a single-sided member can be properly bonded to another single-sided member. In fact, the precise control provided by the present invention in the speed relationship between the applicator roll and the single face member reduces about 50% of the adhesive usage required by the prior art, It allows the single-sided members to be properly bonded together. Reducing the amount of adhesive attached to the folds proportionally reduces the amount of water given to the folds. Such reduction of water content substantially eliminates the problems of warpage and "waviness" that have occurred in the manufacturing process using conventional equipment.

The present invention therefore provides an improved apparatus and method for applying adhesive to the folds of single-sided members that are adhered to each other and adapted to adhere to facings to form cardboard. is there. After passing through the adhesive supply, the peripheral surface of each applicator roll is wiped substantially clean by a doctor, leaving only a limited amount of adhesive in the pocket of the porous peripheral surface. This adhesive is applied to the folds of the single face member that is moved across its circumference. Under normal conditions, the amount of adhesive applied to the pleats is not sufficient to ensure that the single-sided members will adhere properly to each other. However, because of the precise control over the speed of rotation of the applicator roll relative to the speed of movement of the single-sided member, and thus the peripheral speed, this limited amount of adhesive is accurately deposited on the folds, which allows for single-sided The certainty of bonding the member and the surface material is guaranteed. Compared to conventional adhesive applicators, the applicator according to the present invention reduces the amount of adhesive used to the extent of about 50%.

In addition to being economical by reducing the consumption of adhesive, reducing the amount of adhesive deposited on the folds reduces the amount of deposited moisture accordingly. Therefore, the energy required in the drying process to cure the adhesive is reduced. More importantly, the excess amount of water is a major factor that causes warping of the finished cardboard and "waviness" on the surface, so the reduction of the amount of water attached to the folds causes such warping and The problem of "swell" is virtually eliminated. The problem of "waviness", that is, the surface material of the outer surface of the cardboard paper tends to follow the folds located underneath it and the surface becomes unsmooth, and the surface becomes unsmooth This is a particular problem when performing printing and graphic printing. By substantially eliminating "waviness", the apparatus of the present invention enables high quality and cardboard printing on cardboard.

Furthermore, with regard to the given thickness of the finished cardboard, when it is adapted to make cartons,
The stack strength is generally determined by the fold size, and the larger the fold, the higher the stack strength. However, in order to maintain the thickness of the cardboard paper at a given dimension and increase the size of the folds, it is necessary to reduce the thickness of the outer side material. However, this is "swell"
The problem will be exacerbated and will be coordinated. However, since a limited amount of adhesive is applied to the folds, it is possible to correspondingly reduce the thickness of the surface material to increase the size of the folds and maintain a very smooth outer surface on the cardboard. It is possible.

While the embodiments of the present invention have been described in detail, various modifications and other embodiments can be devised by those skilled in the art without departing from the spirit and scope of the present invention described in the claims. Ah

[Brief description of drawings]

FIG. 1 is a schematic side view of an apparatus for applying adhesive to a single-sided member that is a corrugated corrugated board material embodying the teachings of the present invention. FIG. 2 is a side view of a structure portion for supporting a weight roll and adjusting a size of a nip formed between the weight roll and an applicator roll of an adhesive which is combined with the weight roll. FIG. 3 is a side view of a doctor assembly for metering the adhesive applied to the applicator roll. 20 ... Adhesive coating device, 22a-22c ... Folds, 24
a to 24c ... single-sided member, 26 ... cardboard paper, 2
8 ... Friction wheel, 30 ... Tachometer, 32 ...
Microprocessor, 34 ... Motor speed controller, 36a-36c ... Motor, 38a-38c
...... Applicator roll, 40a to 40c ...... Weight roll, 42 ...... Adhesive application station, 44a to 44
c, 46a to 46c ... Guide roll, 48, 50 ...
Endless belt, 52a, 52b, 54a, 54b ... Drum, 56 ... Surface material, 58 ... Drying station, 60
...... Arm, 62 ...... Piston rod, 64 ...... Air cylinder, 66 ...... Screw actuator, 68 ...
… Gearbox, 70 …… Step motor, 72 ……
Motor controller, 74 ... Displacement transducer, 78 ... Adhesive tank, 80 ... Air cylinder, 82
...... Piston rod, 84 …… Arm, 86 …… Spindle, 88 …… Bracket, 90 …… Doctor blade,
92,94 ... Plate, 96 ... Tube.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B05D 7/00 N 8720-4D B29C 65/78 7639-4F B31F 1/24 C 8513-3E B32B 3 / 28 A 7016-4F 31/12 7141-4F // B29L 9:00 4F

Claims (13)

[Claims] 1. A device for applying an adhesive to a plurality of corrugated web folds, the device comprising: a plurality of adhesive applicator rolls; and an adhesive applied to the peripheral surfaces of the applicator rolls. And means for moving each web across the perimeter of one applicator roll that is assembled to press the fold against the perimeter to attach the adhesive from the perimeter to the perimeter. Means for moving the plurality of webs at the same moving speed, a detecting means for detecting the actual moving speed of the plurality of webs, and a web for rotating each applicator roll at a desired rotation speed. The desired rotational speed of one of the applicator rolls is independent of the rotational speed of the other applicator roll, the rotational speed being responsive to the detected actual movement speed. Moreover, even if the detected actual moving speed of the web changes, it is not restricted by it, and is selected and adjustable between the peripheral speed of the applicator roll and the detected actual moving speed of the web. Rotation speed, which is varied as necessary to maintain a constant relationship, which controls the amount and location of adhesive applied to the folds of each web. A device for applying an adhesive. 2. The rotating means causes each applicator roll to rotate independently, whereby the peripheral speed is the same as the moving speed of the web depending on the selected relation between the peripheral speed and the moving speed of the web. The coating device according to claim 1, wherein the coating device is equal in speed, is slower by a predetermined amount, or is faster by a predetermined amount. 3. Doctor means for doctor adjusting the peripherally adhered adhesive of each applicator roll before the adhesive is applied from the peripheral surface of each applicator roll to the folds of its associated web. The coating device according to claim 2. 4. A means for forming a composite sheet material by superposing and adhering webs carrying an adhesive, and the detecting means detects the actual moving speed of the formed composite sheet material. What is claimed is: Claim 3
The coating device according to the item. 5. A combination of the rotating means 1
A plurality of motor arrangements adapted to drive one applicator roll and means connected to said detection means for actuating said motor arrangement to cause each applicator roll to rotate at a certain speed. Including and
The certain speed is varied as necessary to maintain a constant, individually selected and adjustable relationship between the peripheral speed of the applicator roll and the detected actual moving speed of the web. The coating device according to claim 4, which is a speed. 6. Each of said applicator rolls has a small hole in its peripheral surface, and means for adhering an adhesive to the peripheral surface of the applicator roll fills said small hole with an adhesive, and said doctor The means removes substantially all of the adhesive from the peripheral surface of the applicator roll, except for the adhesive retained in the stoma of the applicator roll, thereby limiting the amount of adhesive retained in said stoma. Only a certain amount of adhesive is applied to the folds of the web, which reduces the consumption of adhesive and substantially eliminates the curling of the finished composite sheet and the undulations on its surface. ,
The coating device according to claim 5. 7. A plurality of rotatable weight rolls associated with each of said applicator rolls, together with said applicator rolls, to form a nip through which an associated web is passed, and the dimensions of said nip. Means for adjusting the size of the nip, means for comparing the detected nip size with a predetermined desired nip size, and the result of this comparison. And means for moving the weight roll and the applicator roll relative to one another in order to bring the nip to the desired size. 8. A method of applying an adhesive to the folds of a plurality of corrugated webs, the method comprising: applying the adhesive to the peripheral surfaces of a plurality of applicator rolls; and adhering the peripheral surfaces to the folds. Move multiple webs at the same consistent speed so that each web is moved across the perimeter of a single applicator roll that mates by pressing a fold against the perimeter to deposit the agent In order to control the amount and the application position of the adhesive applied to the folds of each web, the step of detecting, the actual moving speed of the plurality of webs,
The rotation speed is independent of the rotation speed of other rolls, and
Regardless of being constrained by changes in the web's detected actual speed of travel, each selected and adjustable relationship between the roll's peripheral speed and the web's detected actual speed of travel remains constant. Applying an adhesive characterized in that it comprises rotating each applicator roll in response to the detected actual speed of movement of the web, with a varying speed of rotation if necessary to do so. Method. 9. The rotating step causes each applicator roll to rotate separately, thereby causing the peripheral speed of the web to vary depending on a predetermined relationship between the peripheral speed and the moving speed of the web. The speed is the same as the moving speed, is slow by a predetermined amount, or is fast by a predetermined amount,
The coating method according to claim 8. 10. A step of doctoring the adhesive applied to the peripheral surface of each applicator roll before the adhesive is applied from the peripheral surface of the applicator roll to the folds of the associated web. The coating method according to claim 9. 11. A coating method according to claim 10 including the step of forming webs carrying adhesives in an adhesive relationship in which they overlap one another to form a combined composite sheet. 12. Each applicator roll is provided with small holes in its peripheral surface, and the step of applying an adhesive to the peripheral surface of the applicator roll fills these small holes with an adhesive,
In addition, the doctor operation step removes substantially all of the adhesive from the peripheral surface of the applicator roll, except for the adhesive inside the small holes, which results in the limited amount of adhesive retained inside the small holes. Claims, wherein only the agent is adhered to the folds of the web, which reduces the consumption of the adhesive and substantially eliminates the warpage of the composite sheet and the undulations generated on its surface. Item 11. The coating method according to Item 11. 13. A plurality of rotatable weight rolls, one for each of the applicator rolls, forming a nip through which the associated web passes, together with the applicator rolls, and Means for detecting the size of the nip is further included, comparing the detected nip size with a predetermined desired nip size and moving the weight roll and the applicator roll relative to each other based on the result of this comparison. The coating method according to claim 12, wherein the nip has a desired size.