JP3492136B2 - Glue applicator for corrugated sheet - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is installed in a glue machine at a step immediately preceding a double facer section in a corrugated machine, and supplies glue to the top of the core paper corrugated sheet of a single-sided corrugated sheet continuously fed from a single facer. The present invention relates to a glue applying device.

[0002]

2. Description of the Related Art A schematic configuration of a glue machine section installed in a corrugating machine will be described with reference to FIG. A general glue applicator installed on the glue machine 1 of the corrugated machine is a glue roll 2, a doctor roll 3 and a glue roll 2
It is composed of a glue supply section 5 formed by a glue reservoir 4 and the like located below the lid, and a rider roll 6 and the like that are opposed to the glued roll 2 with a predetermined gap. The glue 9 is transferred and supplied to the top of the step of the core paper 8 of the single-faced corrugated cardboard sheet 7 that travels between the glue roll 2 and the rider roll 6 by the glue applying device.

A pressing roll 10 is provided on the sheet introduction port side of the gluing roll 2, and a tension roll 11 is provided on the sheet discharging part side of the gluing roll 2. The press roll 10 and the tension roll 11 stabilize the traveling of the single-faced cardboard sheet 7 and define the contact length of the glue 9 on the single-faced cardboard sheet 7.

The single-faced corrugated board sheet 7 manufactured in the single facer in the previous step is appropriately heated by running around the guide roll 12 and the preheat roll 13, and then sent to the glue machine 1 to be glued to the roll. 2 and contact the top of the core paper 8 with glue 9 on the outer peripheral surface of the roll.
Are transferred and supplied.

The amount of paste (paste thickness) on the outer peripheral surface of the sizing roll 2 is
A part of the peripheral surface of the sizing roll 2 is dipped in the sizing reservoir 4, and is controlled by a doctor roll 3 arranged in parallel while rotating in the direction of the arrow in the figure. The excess glue scraped off by the doctor roll 3 falls into the glue reservoir 4 and is collected. The single-sided corrugated board sheet 7 that has passed through the glue machine 1 is further introduced into the heating part 15 of the double facer 14 in the next step, merges with the liner 16 sent through another route, and is bonded to each other to form the double-sided corrugated board sheet 17. To be done.

In order to press the one-sided corrugated board sheet 7 in the gluing device to the gluing roll 2 side, a rider roll 6 is provided opposite to the gluing roll 2. The engagement state (gap, holding pressure) between the gluing roll 2 and the rider roll 6 is an important factor that influences the quality (strength) of the double-faced cardboard sheet 17, and for example, the step top portion of the core paper 8 is crushed. If
It is known that the strength of a corrugated cardboard box rapidly decreases. Therefore, the rider roll 6 is supported so that the engagement state with the glued roll 2 can be adjusted.

The structure of the support portion of the rider roll 6 that has been conventionally used will be described with reference to FIG. The example shown in FIG. 5 is a pair of swing brackets (rider roll arms) that swings around the fulcrum shaft 18 through expansion and contraction of the cylinder 19 with respect to the glued roll 2 installed in a fixed position. The rider roll 6 is supported by 20 at both shaft ends. Eccentric rolls 21 are engaged with and attached to the swing brackets 20 at both width ends of the device, and the swing vertical position of the swing bracket 20 can be adjusted by appropriately setting the phase angle of the eccentric rolls 21. By adjusting the oscillating lift position of the oscillating bracket 20, the gap between the outer peripheral surface of the rider roll 6 and the outer peripheral surface of the glued roll 2 which are pivotally supported by a part of the oscillating bracket 20 can be appropriately set. It is like this.

By the way, in the corrugated machine,
The type of paper used and the width of the paper are changed quite often. For example, since the thickness of the single-faced corrugated cardboard sheet changes depending on the paper type, ideally it is necessary to optimally adjust the gap each time, but this is actually a troublesome work. In addition, there is a problem that the single-faced corrugated sheet has a tendency to warp, and even if only the gap is kept strictly parallel, uniform pressure cannot be obtained. Therefore, various attempts have been made to improve the pressing method.

FIG. 6 shows an example thereof, which is disclosed in Japanese Patent Laid-Open No. 61-7863.
This is based on Japanese Patent No. 2 publication. This is Manifold 7
It is intended to press the single-sided corrugated board sheet 7 against the sizing roll 2 by the air pressure sent from 0 and a pressing shoe 71 fixed below it through the orifice 72.

Another example is shown in FIG. 7, US Pat. No. 4,764,423.
This is according to Japanese Patent No. This is provided with a large number of divided press shoes 75 in the longitudinal direction, and the air blown from holes 76 formed in the press shoes 75 causes the single-sided corrugated cardboard sheet 7 to roll on the glue 2
It is something that is pressed against. However, in this example, the applied pressure is buffered by the leaf spring 77 and the coil spring 78.

By the way, when the pressing force is applied by the air pressure through the pressing shoe, the gap between the pressing shoe and the single-faced corrugated cardboard sheet, that is, the thickness of the air layer is very important, and if the pressure is changed, the pressing force changes. . Therefore, when the step type (flute) of the single-sided corrugated cardboard sheet changes or when the paper type (paper thickness) changes greatly, the pressing force also changes.

Therefore, the applicant of the present invention has previously filed Japanese Patent Application No. 8-22.
No. 0873 proposed a paste applicator that overcomes the above drawbacks. This outline will be described with reference to FIGS. 8 and 9 to 11.

In the glue applicator shown in FIG. 8, a beam 31 is installed along the axial direction of the glue roll 2, and a bracket 32 is fixed to the beam 31. A swing plate 34 is swingably arranged at the lower end of the bracket 32 via a pin 33, and a pressing shoe 35 is attached to the lower surface of the swing plate 34. The front end (swing end) of the swing plate 34 is biased and supported upward by a tension spring 36, and the swing end on the upper side (counterclockwise direction in FIG. 8) of the swing plate 34 is restricted by an upper limit stopper 37. ing. Further, the lower end of the swing plate 34 (clockwise direction in FIG. 8) is regulated by a lower limit stopper 38.

On the other hand, a holder 39 is fixed to the lower surface of the beam 31, and a flexible tube 40 extending in the longitudinal direction is provided between the holder 39 and the swing plate 34. The flexible tube 40 is connected to the compressor 42 via an air pressure adjusting means 41 as a control device, and air of a predetermined pressure is supplied to the flexible tube 40.

The air pressure adjusting means 41 includes a compressor 4
A pressure reducing valve 43 for reducing the pressure of the compressed air from 2 to a predetermined pressure is provided, and a switching valve 44 for switching the flow of air sent through the pressure reducing valve 43 to the flexible tube 40.
Is provided. The pressing force of the presser shoe 35 is controlled by operating the switching valve 44 on / off. Reference numerals 45 and 46 in the drawing are pressure gauges.

The glue applicator shown in FIGS. 9 to 11 has a structure as shown in FIG. 10 between the swing plate 34 and the pressing shoe 35 in the glue applicator shown in FIG. An air chamber 51 extending in the longitudinal direction is provided. Corresponding to the air chamber 51, the pressing shoe 35 is provided with air ejection holes 52 as a plurality of hole members along the longitudinal direction. The air chamber 51 has an air pressure adjusting means 53 as a control device.
The air is connected to the compressor 42 through the air, and the air having a predetermined pressure is supplied to the air chamber 51 so that the air is ejected from the air ejection hole 52. The air pressure adjusting means 53 is adapted to supply air of a predetermined pressure also to the flexible tube 40.

As shown in FIG. 11, the air pressure adjusting means 53 has a pressure reducing valve 4 connected to the flexible tube 40 side.
3 and a switching valve 44 are provided. In addition, the air chamber 51
Pressure reducing valve 54, flow control valve 55 and switching valve 5 connected to the side
6 is provided, and air having a predetermined pressure is supplied to the air chamber 51 by turning on / off the switching valve 56. Reference numeral 57 in the figure is a pressure gauge.

In the glue applicator shown in FIG. 8, the air pressure supplied to the flexible tube 40 is adjusted by the air pressure adjusting means 41 to control the pressing force of the pressing shoe 35 against the single-faced cardboard sheet 7.

In the glue applying apparatus shown in FIGS. 9 to 11, FIG.
In addition to the actions and effects of the glue applicator shown in, the following actions and effects can be obtained. That is, in the glue applicator provided with the press shoe 35 having the above structure, the single-faced corrugated sheet 7 is passed between the press shoe 35 and the gluing roll 2 to run the switch valve 5
By the operation of 6, the air having a predetermined pressure is supplied to the air chamber 51. When air having a predetermined pressure is supplied to the air chamber 51, air is ejected from the air ejection holes 52 on the lower surface of the pressing shoe 35 toward the single-faced corrugated cardboard sheet 7. As a result, an air layer is formed between the surface of the single-faced cardboard sheet 7 and the pressing shoe 35, and the frictional resistance and wear of the sliding contact surface of the pressing shoe 35 can be greatly reduced. This air layer is shown in Figure 6.
Since the applied pressure is not controlled as in the example of FIG. 7, it is not necessary to control the air pressure or the air film thickness so strictly.

[0020]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
All of the devices that pressurize with air or reduce the frictional force due to an air film ejected air from a nozzle toward a liner of a single-sided corrugated cardboard sheet that passes through.

Usually, in the production of corrugated board, the width of the paper used varies from the maximum width of the machine to about one half thereof.

Normally, since the nozzles are arranged within the maximum machine width, when the paper width is narrow, as shown in FIG. 9, the air blown out from the nozzles 52a at both ends has no paper, so that the glue is directly applied. It will hit the roll surface.

When high-speed air hits the surface of the sizing roll,
Not only does the air scatter the glue and stain the area around the machine, but the glue adheres and accumulates on the paper retainer bar, etc., which solidifies during long-term operation, and evenly pressurizes the next wide sheet of paper. There was a problem that it was difficult to obtain.

Therefore, it is an object of the present invention to provide a paste application device for corrugated cardboard sheets which can prevent the dispersion of the paste and prevent the deterioration of the quality of the sheet and the stain of the machine.

[0025]

In order to achieve the above object, a corrugated board sheet gluing device according to the present invention is arranged across a full width of the corrugated board sheet so as to face the gluing roll with the traveling path of the corrugated board sheet sandwiched therebetween. A glue applying device comprising a presser shoe provided, for ejecting air from the presser shoe to reduce a frictional force with the corrugated cardboard sheet,
The presser shoe is formed with grooves extending air flow passage in the longitudinal direction both end portions out of the cardboard sheet in the longitudinal direction pressing
It is characterized in that it is communicated with the air chamber above the shoe by a communication hole, and that an air ejection port in a direction perpendicular to the surface of the sizing roll is provided in a portion that can face the corrugated cardboard sheet.

Further, a holding shoe disposed across the entire width of the corrugated cardboard so as to face the sizing roll across the traveling path of the corrugated cardboard sheet, and a flexible tube for pressing the pressing shoe toward the corrugated cardboard sheet side by fluid pressure. And a control means for adjusting the fluid pressure supplied to the flexible tube to a predetermined pressure to control the pressing force of the pressing shoe on the corrugated cardboard sheet,
In the glue applying device for ejecting air from the pressing shoe to reduce the frictional force with the corrugated cardboard sheet, the pressing shoe is formed with grooves extending in the longitudinal direction at the air flow passages at both ends in the longitudinal direction which are separated from the corrugated cardboard sheet. Presser foot
It is characterized in that it is communicated with the upper air chamber through a communication hole, and that an air ejection port is provided at a position that can face the corrugated cardboard sheet in a direction perpendicular to the surface of the sizing roll.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a paste applying device for corrugated board according to the present invention will be described in detail with reference to the accompanying drawings.

[First Embodiment] FIG. 1 is a side view of a principal part of a corrugated board sheet paste applicator according to a first embodiment of the present invention.
2 is a sectional view taken along the line II-II in FIG. The glue applying apparatus of this embodiment is the glue roll 2 of the glue machine 1 shown in FIG.
9, and the schematic configuration is the same as that in FIG. 9, so the same members as those in FIG. 9 are denoted by the same reference numerals and detailed description thereof will be omitted.

As shown in FIG. 1, a pressing shoe 35 is attached to the lower surface of the swing plate 34. A front end (swing end) of the swing plate 34 is biased and supported upward by a tension spring 36.

On the other hand, a flexible tube 40 extending in the longitudinal direction is provided between a holder (see FIG. 8) on the lower surface of the beam (not shown) and the swing plate 34. The flexible tube 40 is connected to the compressor 42 via an air pressure adjusting means 53 as a control device, and air of a predetermined pressure is supplied to the flexible tube 40.

As shown in FIG. 2, an air chamber 51 extending in the longitudinal direction is provided between the oscillating plate 34 and the pressing shoe 35, that is, at the joint surface, and the pressing shoe 35 corresponds to the air chamber 51. A continuous groove (air flow passage) 60 extending in the longitudinal direction is provided on the lower surface of the.

Air is supplied to the groove 60 by connecting the groove 60 and the air chamber 51 with each other through a communication hole (air ejection port) 61. The communication hole 61 is provided in a range of about half or less of the maximum paper width, that is, a portion which can always face the single-faced corrugated cardboard sheet 7.

The air chamber 51 has the air pressure adjusting means 53.
The air is supplied to the air chamber 51 by being connected to the compressor 42 via the, and the air is ejected from the communication hole 61 and the groove 60.

In the glue applicator provided with the press shoe 35 having the above structure, the single-faced cardboard sheet 7 is passed between the press shoe 35 and the sizing roll 2 for running, and the air pressure adjusting means 5 is used.
3, the air having a predetermined pressure is supplied to the air chamber 51.
When the air having a predetermined pressure is supplied to the air chamber 51, the air is ejected from the communication hole 61 and the groove 60 on the lower surface of the pressing shoe 35 toward the single-faced cardboard sheet 7. As a result, the single-faced cardboard sheet 7 is pushed toward the sizing roll 2, or an air layer is formed between the surface of the single-faced cardboard sheet 7 and the pressing shoe 35, so that the sliding contact surface of the pressing shoe 35 has frictional resistance and wear. Can be significantly reduced.

On the other hand, at both ends of the single-faced corrugated sheet 7, the air jet discharged from the groove 60 to the atmosphere does not directly hit the surface of the gluing roll 2 as in the conventional case, but goes in a direction parallel to the surface of the gluing roll 2. Therefore, the glue on the surface of the gluing roll 2 is not scattered.

In the glue applying apparatus of this embodiment, the air pressure supplied to the flexible tube 40 is adjusted by the air pressure adjusting means 5.
The pressing force of the pressing shoe 35 on the single-faced corrugated cardboard sheet 7 is controlled by adjusting the pressing force of the pressing shoe 35.

[Second Embodiment] FIG. 3 is a sectional view of a pressing shoe portion according to a second embodiment of the present invention. This is the one-sided corrugated cardboard sheet 7 of the pressing shoe 35 in the first embodiment.
A plurality of air ejection holes (air ejection ports) 52 are provided along the longitudinal direction at a portion that can be opposed to the one side, and at the both ends in the longitudinal direction deviating from the single-faced corrugated cardboard sheet 7, a partial groove extending in the longitudinal direction (air Flow paths) 62a, 62b are formed,
Since the grooves 62a and 62b and the air chamber 51 are connected by the communication hole 61, the same operation and effect as those of the first embodiment can be obtained.

The present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the present invention. The present invention also includes a flexible tube 4
It goes without saying that the present invention can also be applied to the glue applicator as shown in FIG. 6 and FIG.

[0039]

According to the first aspect of the present invention, there is provided a pressing shoe which is arranged over the entire width of the corrugated cardboard sheet so as to face the sizing roll with the traveling path of the corrugated cardboard sheet sandwiched therebetween, and air is supplied from the pressing shoe. In the paste application device for ejecting to reduce the frictional force with the corrugated cardboard sheet, the pressing shoe is formed with grooves extending in the longitudinal direction at least at both longitudinal ends of the pressing shoe that are detached from the corrugated cardboard sheet. Since air outlets are provided in the direction that is perpendicular to the surface of the sizing roll in the areas that can face each other, the air from the holding shoe can reduce the frictional force between the holding shoe and the corrugated cardboard sheet, and even when the paper width changes The air jet can always be maintained so as not to directly hit the gluing roll surface without any adjustment of the blowing device. Therefore, the glue on the surface of the gluing roll is not blown off by the air jet, so that the scattered glue does not accumulate on the pressing shoe to deteriorate the quality of the sheet and to soil the device.

According to the second aspect of the present invention, a holding shoe disposed across the entire width of the corrugated cardboard sheet so as to face the sizing roll with the traveling path of the corrugated board sheet sandwiched therebetween, and the pressing shoe is fixed by fluid pressure to the corrugated board. The pressing shoe comprises a flexible tube that is pressed toward the sheet side, and control means that adjusts the fluid pressure supplied to the flexible tube to a predetermined pressure to control the pressing force of the pressing shoe against the corrugated cardboard sheet. In the glue applicator for ejecting air from the cardboard sheet to reduce the frictional force with the corrugated cardboard sheet, the pressing shoe is formed with grooves extending in the longitudinal direction at least at both longitudinal ends of the pressing shoe which are detached from the corrugated cardboard sheet. The air ejection port in a direction perpendicular to the surface of the sizing roll is provided at a portion that can face the corrugated board sheet. It can be in addition to the operation and effect of the light to impart a proper pressing force onto the corrugated sheet to the pressing shoe.

[Brief description of drawings]

FIG. 1 is a side view of essential parts of a paste application device for corrugated board sheets according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a sectional view of a pressing shoe according to a second embodiment of the present invention.

FIG. 4 is a schematic configuration diagram of a glue machine section installed in a corrugating machine.

FIG. 5 is an enlarged view of a main part in FIG.

FIG. 6 is an explanatory view of a supporting state of a conventional presser shoe.

FIG. 7 is an explanatory view of a pressing situation by a conventional pressing shoe.

FIG. 8 is a schematic configuration diagram of a conventional glue applying device.

FIG. 9 is a schematic configuration diagram of a different conventional glue applying device.

10 is a sectional view taken along line XX of FIG.

11 is a circuit diagram of the air pressure adjusting means of FIG.

[Explanation of symbols]

2 Adhesive roll 7 Single-sided corrugated sheet 34 Swing plate 35 Presser foot shoe 36 tension spring 40 flexible tube 42 Compressor 51 air chamber 52 Air ejection hole 53 Air pressure adjusting means 60 grooves 61 communication hole 62a, 62b groove

Continuation of the front page (56) Reference JP 61-78632 (JP, A) JP 3-249423 (JP, A) JP 49-130940 (JP, A) (58) Fields investigated (Int .Cl. ⁷ , DB name) B31F 1/24 B31F 1/36

Claims (2)

(57) [Claims] 1. A pressing shoe is provided across the width of the corrugated cardboard so as to face the sizing roll across the traveling path of the corrugated cardboard sheet, and air is ejected from the pressing shoe to cause friction with the corrugated cardboard sheet. In the paste applicator for reducing the force, the pressing shoe is formed with grooves extending in the longitudinal direction at the air flow passages at both ends in the longitudinal direction, which are separated from the corrugated cardboard sheet, and has a communicating hole with the air chamber above the pressing shoe.
With communicating, paste application apparatus of the cardboard sheet, characterized in that a perpendicular direction of the air jetting port to glue roll surface sites capable of facing the corrugated sheet. 2. A holding shoe disposed across the entire width of the corrugated cardboard so as to face the sizing roll across the traveling path of the corrugated board, and a flexible tube for pressing the pressing shoe toward the corrugated board by fluid pressure. And a control means for adjusting the fluid pressure supplied to the flexible tube to a predetermined pressure to control the pressing force of the pressing shoe on the corrugated cardboard sheet, and ejecting air from the pressing shoe to control the pressing force. In the glue applicator for reducing the frictional force with the corrugated cardboard sheet, the pressing shoe is formed with grooves extending in the longitudinal direction at the airflow passages at both ends in the longitudinal direction, which are separated from the corrugated cardboard sheet, and above the pressing shoe.
The paste application device for corrugated board sheet, characterized in that it is connected to the air chamber through the communication hole, and an air ejection port is provided at a position which can face the corrugated board sheet in a direction perpendicular to the surface of the gluing roll.