EP3546071B1 - Dispositif permettant l'application intermittente d'une substance coulante ainsi que procédé d'application d'une telle substance - Google Patents

Dispositif permettant l'application intermittente d'une substance coulante ainsi que procédé d'application d'une telle substance Download PDF

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Publication number
EP3546071B1
EP3546071B1 EP18164282.8A EP18164282A EP3546071B1 EP 3546071 B1 EP3546071 B1 EP 3546071B1 EP 18164282 A EP18164282 A EP 18164282A EP 3546071 B1 EP3546071 B1 EP 3546071B1
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EP
European Patent Office
Prior art keywords
flowable substance
application
adhesive
pump
actuator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP18164282.8A
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German (de)
English (en)
Other versions
EP3546071A1 (fr
Inventor
Micha Schären
Claudio Hofer
Hanspeter Felix
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robatech AG
Original Assignee
Robatech AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robatech AG filed Critical Robatech AG
Priority to EP18164282.8A priority Critical patent/EP3546071B1/fr
Priority to JP2019010377A priority patent/JP7335074B2/ja
Priority to US16/355,823 priority patent/US11273461B2/en
Priority to CN201910238921.4A priority patent/CN110302911B/zh
Publication of EP3546071A1 publication Critical patent/EP3546071A1/fr
Application granted granted Critical
Publication of EP3546071B1 publication Critical patent/EP3546071B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/085—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to flow or pressure of liquid or other fluent material to be discharged
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet
    • B05C5/0266—Coating heads with slot-shaped outlet adjustable in length, e.g. for coating webs of different width
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B9/00—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour
    • B05B9/03—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material
    • B05B9/04—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump
    • B05B9/0403—Spraying apparatus for discharge of liquids or other fluent material, without essentially mixing with gas or vapour characterised by means for supplying liquid or other fluent material with pressurised or compressible container; with pump with pumps for liquids or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1002—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves
    • B05C11/1007—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves responsive to condition of liquid or other fluent material
    • B05C11/1013—Means for controlling supply, i.e. flow or pressure, of liquid or other fluent material to the applying apparatus, e.g. valves responsive to condition of liquid or other fluent material responsive to flow or pressure of liquid or other fluent material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1039—Recovery of excess liquid or other fluent material; Controlling means therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/10—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain an adhesive surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42C—BOOKBINDING
    • B42C9/00—Applying glue or adhesive peculiar to bookbinding
    • B42C9/0006—Applying glue or adhesive peculiar to bookbinding by applying adhesive to a stack of sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
    • B05B12/08—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means
    • B05B12/085—Arrangements for controlling delivery; Arrangements for controlling the spray area responsive to condition of liquid or other fluent material to be discharged, of ambient medium or of target ; responsive to condition of spray devices or of supply means, e.g. pipes, pumps or their drive means responsive to flow or pressure of liquid or other fluent material to be discharged
    • B05B12/087—Flow or presssure regulators, i.e. non-electric unitary devices comprising a sensing element, e.g. a piston or a membrane, and a controlling element, e.g. a valve
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1042—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material provided with means for heating or cooling the liquid or other fluent material in the supplying means upstream of the applying apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/0254—Coating heads with slot-shaped outlet
    • B05C5/0258—Coating heads with slot-shaped outlet flow controlled, e.g. by a valve

Definitions

  • the invention relates to a device for the intermittent application of a flowable substance, in particular a flowable adhesive, to at least one substrate, with an application nozzle for applying the flowable substance to the substrate, a container for receiving the flowable substance, a pump for conveying the flowable substance and a Drive, wherein the pump is operatively connected to the container and the pump can be driven by means of the drive whose speed can be regulated, furthermore with an actuating element which is operatively connected to the pump and can be switched to two positions, wherein the actuating element in a first position the free-flowing Substance directs to the application nozzle and in a second position blocks the feed line to the application nozzle, furthermore with a control device for actuating the actuating element and for regulating the speed of the drive of the pump.
  • a flowable substance in particular a flowable adhesive
  • the invention also relates to a method for applying a flowable substance to a substrate using such a device.
  • printed sheets are assembled into loose book blocks and then processed in a perfect binding device, essentially on the spine, then adhesive is applied to the book block spine and/or to the inside of the spine of a Applied envelope, which is combined with the book block and then pressed against this.
  • the book blocks are each clamped during processing in a guided, revolving transport clamp of the perfect binding device with the spine protruding downwards.
  • the adhesive is, in particular, a dispersion adhesive, a hot-melt adhesive, or a combination of dispersion and hot-melt adhesives.
  • the adhesive polyurethane called PUR for short, has proven to be a hot-melt adhesive that has particularly good sheet tear-out strength and has achieved particularly advantageous results with the book block in terms of the 180° open behavior, the so-called lay-flat behavior.
  • This adhesive can also be used to advantage for poorer paper quality, for example for coated papers in which the proportion of coating components exceeds the proportion of fibers required for strength, and which are also more difficult to roughen in order to expose the fibers for bonding.
  • slot nozzle application devices For the processing of reactive adhesives, for example polyurethanes that react chemically with moisture in the environment, so-called slot nozzle application devices are preferably used.
  • the adhesive is usually liquefied in a sealed pre-melting device filled with a dry gas and fed by means of a volumetrically pumping pump via an adhesive feed line to an application head of the application nozzle designed as a slot nozzle and transferred from there to the spine of the book block or the cover.
  • the per unit time too
  • the amount of adhesive that can be conveyed depends on the conveying speed of the book block, the thickness of the book block and the thickness of the adhesive film to be applied to the spine of the book block or the cover.
  • a control device calculates the required speed of the pump or the quantity of adhesive to be conveyed by the pump. In the area between consecutive book blocks, the glue supply to the slot nozzle must be interrupted.
  • a corresponding to the above-described working device which has the features of the device of the type mentioned, is from EP 2 319 707 A1 known.
  • this device has an adhesive retraction device which is connected to the control device and is connected to the control device via a valve. To apply the adhesive film, the control valve is opened substantially simultaneously, the pump is started and accelerated to the calculated speed, and the adhesive previously stored therein is ejected by the adhesive retraction device.
  • the device must be provided with the adhesive retraction device, which must also be activated, in particular exactly in response to the activation of the actuating element or valve, which is operatively connected to the pump and can be moved into the two positions, namely in the first position in which the flowable adhesive is fed to the applicator nozzle and the second position in which the supply line to the applicator nozzle is blocked.
  • a glue valve for intermittently applying strips of glue to sheet material, such as paper webs is known from US Pat DE 42 11 942 A1 known.
  • This glue valve is a switching valve for applying glue.
  • the valve has a valve housing with an adhesive inlet, which is connected to a pump for conveying the adhesive to the valve, and the valve housing also has an adhesive return, which is connected to an adhesive reservoir.
  • the adhesive is conveyed by the pump to the adhesive outlet of the valve when the adhesive outlet is open.
  • the pump continues to run without any significant pressure fluctuations. For this reason, when the adhesive outlet is closed, there is a connection between the adhesive feed, which is acted upon by the pump, and the adhesive return.
  • the required adhesive volume flow is determined as a function of an application thickness of an adhesive, a book block thickness and a speed at which the book blocks are moving. Due to the required adhesive volume flow and a known delivery rate per revolution of an adhesive pump, the required speed of the adhesive pump is set and controlled. An encoder is provided to record the process speed.
  • the adhesive circulates continuously in the circulating adhesive system.
  • An application head has a valve that is designed as a switchover valve. The switching valve has the task of alternately directing the adhesive from a pressure source to an application nozzle or into a return hose. If the valve is in the position for the application nozzle, the adhesive flows to the application nozzle.
  • the adhesive flows back into the tank of a premelter.
  • a motor-driven steplessly adjustable throttle is installed in the return hose in front of the tank from the pre-melting device.
  • the task of the throttle is to generate approximately the same pressure drop in the return as via the application nozzle, so that the adhesive pressure generated by the adhesive pump only changes insignificantly when the switchover valve is actuated and between the adhesive application via the application nozzle and the return via the throttle and switches. This ensures that the pressure conditions do not change when the adhesive is applied and the application forms an exact beginning on the book blocks.
  • the adhesive in the application nozzle has to be accelerated.
  • volume control for the glue pump can be used.
  • quantity control with a circulation system is not easy to control for precise adhesive application. It has been shown that it is very important to precisely adjust the flow resistance of the restrictor.
  • a separate calibration process for determining the throttle position is required for each setting of the length of the outlet cross section of the application nozzle, for each type of adhesive and for each production speed.
  • the calibration data is stored in a data matrix and can be reused for similar adhesive configurations. This system delivers very good adhesive applications. Disadvantages are the high costs of the application system, in particular for the throttle, which can normally be adjusted via a servo motor, and the great effort involved in the calibration processes.
  • an application device in which a volumetric feed pump is used, wherein application material can be conveyed back via a return line from an outlet opening of the pump to an inlet opening of the pump.
  • the return line is assigned a return valve, which is designed to release and block the flow of material through the return line, preferably also to throttle it.
  • the return valve is a valve with a variable flow cross-section that changes its flow cross-section depending on the pressure of the application material on the input side, in particular increases its flow cross-section with increasing pressure and decreases it with decreasing pressure.
  • the object of the present invention is to develop a device that has the features of the preamble of patent claim 1 in such a way that an exact intermittent dispensing of free-flowing substance from the applicator nozzle is guaranteed with little structural effort and little control effort. It is also an object of the invention to specify an advantageous method using such a device.
  • the arrangement of drive and pump has a characteristic according to which the speed of the drive is linear with the delivery volume of the pump.
  • the device is designed in such a way that in a second position, when the pump is driven, the actuating element returns the flowable substance via a line to the container. In the first position, the control element blocks the return flow to the container.
  • the speed of the drive is different in the two positions of the actuating element, thus in the first and the second position.
  • the device thus has a supply line to the switchable control element and a return line from the switchable control element to the container.
  • the flowable Substance can thus circulate from the container via the pump to the control element and, when the control element is in the second position, from there back to the container.
  • the flowable substance is routed to the application nozzle and the return line to the container is blocked so that there is no circulation in this case.
  • the speed of the drive is linear to the delivery volume of the pump, the speed of the drive is a direct measure of the delivery volume.
  • the speed of the drive is preferably proportional to the delivery volume of the pump.
  • the speeds of the drive in the two positions of the adjusting element are such that the pressure of the flowable substance immediately upstream of the adjusting element during dispensing from the applicator nozzle and during the return of the flowable substance back to the container is essentially the same is big.
  • substantially it is meant that the pressure of the flowable material during dispensing should be no more than 10 percent up or down with respect to the pressure during return of the flowable material back to the container, preferably no more than 5 percent.
  • the actuating element has a switchover valve that can be switched over into the two positions.
  • the function of switching between the two positions is thus implemented by means of a single switching valve.
  • the actuating element has two valves, with a first valve in a first position directing the flowable substance to the application nozzle and in a second position blocking the supply line to the application nozzle, and the second valve in a first position blocking the backflow to the tank and releases the return flow to the tank in a second position.
  • two independent valves are thus provided.
  • an outlet cross section of the application nozzle in particular an application nozzle designed as a slot nozzle
  • an application nozzle designed as a slot nozzle can be changed, in particular with a constant width of the outlet cross section, its length can be changed.
  • the use of a slot nozzle is intended in particular when the device is intended to produce perfect-bound printed products and the adhesive is to be applied to intermittently conveyed printed products in the area of book block spines and/or insides of the spines of covers. If printed products of different thicknesses are to be produced, the length of the slotted nozzle must be adjusted according to this thickness.
  • the length of the slot nozzle cross-section corresponds to the width of the adhesive application on the respective printed product and the length of the application results from the opening time of the slot nozzle while the printed product is being conveyed along the slot nozzle.
  • a throttle is preferably integrated into a return flow section of the actuating element or into the line through which the free-flowing substance is fed to the container.
  • This choke is not required in principle.
  • the advantage of a throttle can be seen in the fact that a flow of the throttle can be represented which can be adjusted with regard to the characteristics of the application nozzle, in particular the variable characteristics of the slot nozzle. This results in only slightly different conditions in the device for the two switching positions of the actuating element.
  • the throttle will be a separate component.
  • the throttle is realized by a line section which causes a throttling due to its length.
  • the throttle can also be the actuating element itself, which, due to its design, brings about the throttling in the second position of the actuating element, ie when the flowable substance is fed back.
  • the throttle can be adjustable or non-adjustable.
  • the throttle is not adjustable.
  • the flow resistance of the throttle in particular a permanently installed throttle, is approximately the flow resistance of the application nozzle with an average setting of the length of the outlet cross section of the application nozzle, i.e. with an average setting of the application width of the free-flowing substance, in particular of the free-flowing adhesive, on the respective printed product and an average production speed of the book block.
  • a change in the speed of the drive of the pump and thus the linear change in the volume flow delivered creates a pressure drop in the return line and across the fixed throttle that is approximately the same as that across the application nozzle, so that the pressure of the flowable substance generated by the pump changes only insignificantly when the actuator is actuated.
  • volume control for the pump can be used.
  • a pressure sensor for determining the pressure of the flowable substance is arranged, with the pressure sensor being able to determine the pressure of the flowable substance and can be transmitted to the control device.
  • a pressure sensor makes it possible to calibrate the device.
  • the pressure sensor can only be installed temporarily for adjustment purposes and/or for calibration purposes.
  • the pressure sensor can be a permanent part of the device.
  • the device then builds more complex and is more expensive.
  • the device may include means for limiting the pressure of the flowable material downstream of the pump.
  • a maximum pressure in particular an adjustable maximum pressure, is preferably monitored by the pressure sensor.
  • Control means are provided which switch off the pump when the maximum pressure is exceeded and switch the control element to its return position. In this way, an overloading of the device, which would lead to its damage, can be effectively ruled out.
  • the ratio between the volume flow of the flowable substance during the application of the free-flowing substance to the volume flow of the free-flowing substance during the return line to the container is determined by a calibration process.
  • the ratio described is determined by a calibration process.
  • the adjustment process is only dependent on the set length of the outlet cross section of the application nozzle.
  • a speed of a substrate conveyed relative to the application nozzle and/or the thickness of the flowable substance to be applied to the substrate and/or the viscosity of the flowable substance and/or the flow behavior of the flowable substance is selected in a medium application range for the adjustment process. With this, the adjustment can take place with relatively little effort, and thus relatively easily.
  • the adjustment process is software-controlled and runs automatically.
  • the entire adjustment range of the applicator nozzle is first covered and a pressure present at the pressure sensor and the speed of the drive are determined for selected lengths of the outlet cross section of the applicator nozzle.
  • the control element is switched to circulation and the respective speeds of the drive are determined for the same selected lengths under the same selected conditions, at which the pressure on the pressure sensor is the same as during the application of the substance by means of the application nozzle.
  • the large number of ratios determined between the volume flow during the application of the free-flowing substance and the circulation are stored and used by the control device during later operation of the device.
  • the percentage deviation from the pressure between the start and end of application of the flowable substance on the substrate is measured during the adjustment process when operating at a constant conveying speed of the substrate and averaged over several application cycles, as well as the speed ratio of the pump between application of the flowable substance and circulation of the flowable substance is automatically changed in steps until the measured pressure deviation during the application of the flowable substance becomes minimal.
  • An essential advantage of the device described and the method described is that no dynamic pressure builds up at the beginning of the application of the flowable substance, in particular at the beginning of the application of the adhesive. Owing to the circulation system, deposits of the flowable matter in the supply line and the return line hardly exist because the flowable matter does not remain there as long as the matter is kept in the flowable state.
  • the length of the outlet cross section of the application nozzle, and thus the application width of the flowable substance onto the substrate or onto these substrates, can be adjusted during the time that remains during production between two subsequent applications of flowable substance. After the adjustment, it is generally not necessary to retract the application nozzle, so that the quality of the application on the first substrate, in particular on the first book, is already sufficient after the adjustment.
  • the device is ideally suited for digitally produced products, in particular digitally produced printed products that are produced in very short runs. A calibration process can be carried out quickly and easily. Under certain conditions, the user does not have to carry out an adjustment process at all.
  • the volumetric conveyance of the flowable substance described in connection with the present invention is used with constant operating conditions of the device, thus in particular with constant thickness, constant temperature of the flowable substance, constant viscosity of the flowable substance.
  • two transmission ratios are selected for the drive.
  • a translation is chosen for the application of the flowable material.
  • the other translation is chosen for the circulation of the flowable material.
  • the adhesive is, for example, polyurethane.
  • This hot-melt adhesive has particularly good sheet tear-out strength, as well as optimum lay-flat behavior with book blocks 3 .
  • a premelter 4 a heated adhesive supply line 5, a heated adhesive return line 6 and a heated adhesive application station 7.
  • the book blocks 3 are clamped in transport clamps 8 and are moved by a traction mechanism 9 in a direction of movement corresponding to the illustrated coordinate X of an orthogonal system via the application station 7, specifically an application nozzle 10 of the application station 7.
  • the other coordinates Y and Z are illustrated.
  • An outlet cross-section 11 of the application nozzle 10 that is rectangular in the top view, viewed against the coordinate z, has an adjustable longitudinal extension in the Y direction and a constant width extension in the X direction.
  • variable longitudinal extent of the outlet cross section is matched to the respective width of the book block 3, this width extending in the Y direction, and the application length of the adhesive on the spine 2 of the book block 3 results from the conveying movement of the respective book block 3 in the X direction.
  • Direction when the application nozzle 10 is open when the application nozzle 10 is open.
  • a defined application thickness results in the Z direction on the book spine 2 (see in particular the representation of the 4 ).
  • the adhesive is evenly applied to the spine 2 of the book with the aid of a control device 12, an electric drive 13 and a pump 14 which can be driven by the drive 13 in order to convey the free-flowing adhesive.
  • the speed of the drive 13 can be regulated.
  • the pump 14 is a gear pump.
  • the respective transport clamp 8 has a front jaw 15 designed as a plate and a rear jaw 16 also designed as a plate.
  • the cheeks 15, 16 of the respective transport clamp 8 are moved synchronously in the X direction.
  • the respective rear jaw 16 cannot be moved in the Y direction. Only the front jaw 15 can be moved in the Y direction and in the opposite direction, so that the distance between the two jaws 15, 16 can be changed for the purpose of clamping the book block 3 between the jaws 15, 16.
  • the respective rear jaw 16 forms on the side facing the front jaw 15 a plane spanned by the coordinates X and Z, which is essentially, with the exception of minor deviations, on the same plane as a stop plane 17 of a fixed stop 18 of the application station 7. This Stop 18 forms a guide for the book blocks 3 on an application head 19 of the application station 7.
  • a sensor 20 for detecting the transport speed of the book block 3 in the X direction, a sensor 21 for detecting the start and end of the respective book block 3 in relation to the X direction, and an actuating element 22 designed as a valve for the supply of the free-flowing adhesive to the applicator head 19 and, if required, a pressure sensor 23 are operatively connected via a connecting line 24 .
  • the free-flowing adhesive is supplied volumetrically from the pre-melting device 4 via the supply line 5 by the pump 14, which is driven by the drive 13 and is controlled by the control device 12.
  • the adhesive delivered by the pump 14 is fed back to the premelting device 4 via the return line 6 during the time period during which no adhesive is being applied.
  • FIG. 3 illustrates details of the application head 19 with an adjustment mechanism 25 for adjusting the outlet cross section 11 of the application nozzle 10, in that a cover 26, which more or less covers the outlet cross section 11, can be moved in the Y direction and in the opposite direction by means of the adjustment mechanism 25.
  • the respective book block 3 is moved linearly in the X-direction via the application nozzle 10 designed as a slit nozzle.
  • the free-flowing adhesive is transferred to the spine 2 of the book via the outlet cross section 11 .
  • the movable cover 26 is guided by a linear guide 27 with as little play as possible and is driven by a drive 28 of the cover 26 via the adjustment mechanism 25 is actuated and each adjusted so that the length Y of the outlet cross section 11 essentially corresponds to the thickness of the book block.
  • the adhesive is applied to the spine 2 of the book.
  • the application thickness 30 of the adhesive can be set in a range from 0.05 to 4 mm.
  • the application thickness is preferably in the range from 0.3 to 0.6 mm for PUR.
  • the distance from the beginning of the order 31 to the front 32 of the book block 3 and the distance from the end of the order 33 to the back 34 of the book block 3 can be set between -5 and 100 mm. These values are preferably between 0 and 15 mm.
  • the application width i.e. the dimension in the Y-direction, essentially corresponds to the book block thickness and is in the range of 1 to 80 mm.
  • the maximum expected production speed of the book block 3 can be set between 1,000 per hour and about 6,000 per hour. However, the volume control system described can also be used for significantly higher production speeds. Then the change in order width is limited by moving the cover 26 between two subsequent book blocks.
  • the drive 13 and the pump 14 are arranged below the pre-melting device 4 .
  • the drive 13 is connected to the pump 14 via a clutch.
  • figure 5 shows the basic structure of the device 1 in connection with a perfect binding machine.
  • the transport clamps 8 of the perfect binding machine are attached to the traction means 9 and are moved in the X direction at a defined speed. As a rule, this speed remains constant during production.
  • the book blocks 3 are clamped into the transport clamps 8 and moved with the transport clamps 8 .
  • the speed of the book blocks 3 is detected by the sensor 20 and forwarded to the control device 12 for processing.
  • the leading edge of the book assigned to the front 32 and the trailing edge of the book assigned to the back 34 are detected by the sensor 21 and forwarded to the control device 12 for processing.
  • the perfect binding machine transmits the signals for the book block thickness to the control device 12 in a suitable manner, so that it can clearly assign the book block thicknesses to be processed to the book blocks to be processed.
  • the decisive factor here is that the control device 12 has the data on the speed and the book block thickness at its disposal and can determine the time at which the beginning and end of each application of adhesive takes place.
  • the manner in which the data required for this reaches the control device 12 can also be designed differently from the way shown or described.
  • the adhesive is melted in the pre-melting device 4 and kept ready in flowable form.
  • the pump 14 conveys the adhesive stored in the pre-melting device 4 via the feed line 5 and the adjusting element 22 or valve either to the application nozzle 10, during the application of adhesive to the book spines 2, or via the return line 6 back to the pre-melting device 4.
  • the adhesive pressure is optional pressure sensor 23 detected immediately before the actuator 22 and transmitted to the control device 12. The pressure sensor 23 is not absolutely necessary for the system to function satisfactorily and can be omitted for cost reasons or installed only temporarily.
  • the cover 26 of the application nozzle 10 for adjusting the application width of adhesive is actuated, adjusted and adjusted via the adjustment mechanism 25 and the drive 28 .
  • the signal and the activation of the drive 28 can be made available or take place either by the control device of the perfect binding machine or by the control device 12 of the device 1 .
  • the adjusting element 22 for supplying the adhesive to the application nozzle 10 is actuated by the control device 12 in such a way that the beginning of each application of adhesive and the end of each application of adhesive correspond exactly to the previously determined values.
  • the actuating element 22 is designed as a switching valve. In a first position of the adjusting element 22, a flow from the supply line 5 to the applicator nozzle 10 is free and the return line 6 is blocked.
  • the supply of adhesive to the application nozzle 10 is interrupted and the feed line 5 via a throttle 35 integrated into the adjusting element 22 the return line 6 connected.
  • this throttle is integrated into the actuating element 22, this throttle or a throttle element can also be built into the return line 6 as a separate component.
  • the drive 13 of the pump 14 is controlled by the control device 12 using all the signals described above in such a way that the application of adhesive to the book blocks 3 has a clearly defined beginning, a clearly defined end and an even distribution over the application length.
  • the theoretical volume flow of adhesive during the application is determined from the speed of the moving book blocks 3, from the application width and from the application thickness of the adhesive on the book block 3.
  • the application thickness must be supplied to the control device 12 as a parameter. This usually takes place via an input terminal that is operated by the user of the device 1 . In terms of digital book production, the default value for the application thickness can also be supplied to the control device 12 by the perfect binding machine or by a higher-level controller.
  • the pump 14 generally delivers an adhesive volume flow that differs from the adhesive volume flow of the adhesive application.
  • This volume flow of adhesive during the return feed into the pre-melting device 5, i.e. during the circulation of adhesive, is so large that the adhesive pressure in front of the actuating element 22 is as large as possible the same as during the application of the adhesive via the application nozzle 10 to the book spines 2.
  • the relationship between the adhesive volume flow during the application of the adhesive and the adhesive volume flow during the circulation or return of adhesive is primarily dependent on the set length of the outlet cross section 11 of the application nozzle and thus on the application width of the adhesive on the respective book block 3.
  • the flow resistance through the application nozzle 10 depends on the set length of the outlet cross section 11 of the application nozzle 10.
  • the ratio between the volume of adhesive during the application of adhesive to the volume of adhesive during circulation depends on the speed of the book blocks 3, the application thickness 30 and the viscosity and flow behavior of the used adhesive dependent.
  • the viscosity of the adhesive is also dependent on the temperature of the adhesive and the age or aging of the adhesive.
  • the ratio can be determined empirically without measuring pressures. The ratio is changed until the quality of the applied adhesive reaches an optimum. This process is repeated for a number of different adjustment parameters. All of the volume flow ratios determined are integrated into the control unit. In this way it is conceivable that adhesive application devices can be built and delivered without having to go through any adjustment or calibration procedures. If the current parameters differ from the parameters that were present during the empirical determination of the ratios of the volume flows, a somewhat reduced quality of the adhesive application must be expected.
  • Another way of determining the volume flow ratios is via a so-called factory calibration.
  • a comparison or calibration process is carried out for each individual adhesive application device.
  • the advantage of such a solution is that the comparison is precisely tailored to the components actually used, the hoses, pre-melting device, application nozzle and also to the manufacturing and assembly tolerances of the parts actually used. If possible, the adhesive used later should then also be used, if possible with the temperature settings used later. It It is conceivable to install the pressure sensor exclusively for this factory adjustment. The adjustment process can then run automatically under software control. The entire adjustment range of the application nozzle is first covered and the adhesive pressure present at the pressure sensor is determined for selected application widths for an average speed of the book blocks and an average application thickness of the adhesive.
  • control element is switched to circulation and, for the same selected application widths, those speeds of the pump or drive are determined at which the adhesive pressure at the pressure sensor is the same as during the adhesive application using the application nozzle.
  • the ratios determined from this between the adhesive volume flow during the application of adhesive and the adhesive volume flow during circulation are stored and used by the control device during later operation of the device.
  • Another important variant for the comparison is an automatic comparison of the ratios between the adhesive volume flow during the adhesive application and the adhesive volume flow during the circulation.
  • values determined via the factory calibration serve as a basis or as a starting value.
  • it is constantly checked whether the adhesive pressure applied during adhesive application and the adhesive pressure applied during circulation are the same or within an adjustable tolerance. This tolerance is a maximum of ⁇ 10 percent, preferably a maximum of ⁇ 5 percent. If the difference between the two pressures is outside the set tolerance, the corresponding ratio of the adhesive volume flows is gradually adjusted until the difference between the two pressures is within the specified tolerance.
  • the percentage deviation of the pressure between the start and end of application of the flowable substance on the substrate can be measured and averaged over several application cycles, even when operating with a constant conveying speed of the substrate, as well as the speed ratio of the pump between application of the flowable substance and circulation of the flowable substance Substance can be automatically changed step by step until the measured pressure deviation during the application of the flowable substance is minimal.
  • Combinations of the methods described above can be used to determine the ratios of the adhesive volume flows for the adhesive application and the adhesive volume flows for circulation.
  • An adjustable maximum pressure can certainly also be monitored with the pressure sensor 23 . If the maximum pressure is exceeded, the drive 13 of the pump 14 switches off and the actuating element 22 moves to the reverse position.
  • valve 6 shows a slightly compared to the arrangement figure 5 modified arrangement. So is the actuator 22, in contrast to the embodiment figure 5 with the switching valve, designed in such a way that it has two valves 36, 37. Two standard valves are used here. In a first position, the valve 36 directs the free-flowing adhesive to the application nozzle 10 and in a second position blocks the supply line to the application nozzle 10. In the first position, the valve 36 blocks the return flow to the premelting device 4 and in the second position allows the return flow to the premelting device 4 free. The throttle element 35 is assigned to the return line 6 immediately behind the valve 37 . The mechanical and control engineering complexity is higher for the variant with two valves 36, 37 than for the variant with the switching valve.

Claims (15)

  1. Dispositif (1) destiné à l'application intermittente d'une substance coulante, en particulier d'une substance adhésive coulante, sur au moins un substrat, présentant les particularités suivantes :
    - une buse d'application (10) pour appliquer la substance coulante sur le substrat,
    - un récipient (4) pour recevoir la substance coulante,
    - une pompe (14) pour débiter la substance coulante, et un mécanisme d'entraînement (13), la pompe (14) étant en liaison fonctionnelle avec le récipient (4), et la pompe (14) pouvant être entraînée au moyen du mécanisme d'entraînement (13),
    - un élément de réglage (22) qui est en liaison fonctionnelle avec la pompe (14) et peut être transféré dans deux positions, dans lequel, dans une première position, l'élément de réglage (22) conduit la substance coulante à la buse d'application (10), et dans une deuxième position, bloque l'amenée à la buse d'application (10),
    - un dispositif de commande (12) pour actionner l'élément de réglage (22),
    - l'agencement du mécanisme d'entraînement (13) et de la pompe (14) présente une caractéristique selon laquelle la vitesse de rotation du mécanisme d'entraînement (13) est linéaire par rapport au débit de la pompe (14),
    - dans une deuxième position, lorsque la pompe (14) est entraînée, l'élément de réglage (22) ramène la substance coulante au récipient (4) en passant par une conduite (6),
    - dans la première position, l'élément de réglage (22) bloque le reflux vers le récipient (4),
    caractérisé par les particularités suivantes :
    - la vitesse de rotation du mécanisme d'entraînement (13) est réglable,
    - le dispositif de commande sert à régler la vitesse de rotation du mécanisme d'entraînement (13) de la pompe (14),
    - la vitesse de rotation du mécanisme d'entraînement (13) est différente dans les deux positions de l'élément de réglage (22).
  2. Dispositif selon la revendication 1, caractérisé en ce que les vitesses de rotation du mécanisme d'entraînement (13) dans les deux positions de l'élément de réglage (22) sont telles que la pression de la substance coulante est substantiellement la même immédiatement en amont de l'élément de réglage (22) pendant la sortie de la buse d'application (10) et pendant le retour de la substance coulante vers le récipient (4).
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que l'élément de réglage (22) présente une soupape de commutation qui peut être commutée sur les deux positions.
  4. Dispositif selon la revendication 1 ou 2, caractérisé en ce que l'élément de réglage (22) présente deux soupapes (36, 37), dans lequel, dans une première position, une première soupape (36) conduit la substance coulante à la buse d'application (10), et dans une deuxième position, bloque l'amenée à la buse d'application (10), tout comme dans une première position, la deuxième soupape (37) bloque le reflux vers le récipient (4), et dans une deuxième position, libère le reflux vers le récipient (4).
  5. Dispositif selon l'une quelconque des revendications 1 à 4, caractérisé en ce qu'une section transversale de sortie (11) de la buse d'application (10), en particulier d'une buse d'application (10) réalisée sous forme de buse à fente, est variable, en particulier en ce que pour une largeur constante de la section transversale de sortie (11) sa longueur est variable.
  6. Dispositif selon l'une quelconque des revendications 1 à 5, caractérisé en ce qu'un étrangleur (35) est intégré dans une partie de reflux de l'élément de réglage (22) ou dans la conduite (6) à travers laquelle la substance coulante est ramenée au récipient (4).
  7. Dispositif selon la revendication 6, caractérisé en ce que l'étrangleur (35) n'est pas réglable.
  8. Dispositif selon l'une quelconque des revendications 6 et 7, caractérisé en ce que la résistance à l'écoulement de l'étrangleur (35) correspond substantiellement à la résistance à l'écoulement de la buse d'application (10) pour un réglage moyen de la longueur de la section transversale de sortie de la buse d'application (10).
  9. Dispositif selon l'une quelconque des revendications 1 à 8, caractérisé en ce qu'en amont de l'élément de réglage (22), en particulier de manière adjacente au passage de la substance coulante à travers l'élément de réglage (22) jusqu'à la buse d'application (10), un capteur de pression (23) pour établir la pression de la substance coulante est disposé, le capteur de pression (23) permettant d'établir la pression de la substance coulante et de la transmettre au dispositif de commande (12).
  10. Dispositif selon la revendication 9, caractérisé en ce que le capteur de pression (23) n'est installé que temporairement à des fins d'équilibrage et/ou d'étalonnage.
  11. Dispositif selon l'une quelconque des revendications 1 à 10, caractérisé en ce qu'un équipement pour limiter la pression de la substance coulante est présent en aval de la pompe (14), de préférence le capteur de pression (23) surveillant une pression maximale, en particulier une pression maximale réglable, des moyens de commande étant prévus qui débranchent le mécanisme d'entraînement (13) de la pompe (14) lorsque la pression maximale est dépassée et commutent l'élément de réglage (22) dans sa position de retour.
  12. Procédé permettant d'appliquer une substance coulante sur un substrat en utilisant un dispositif selon l'une quelconque des revendications précédentes, caractérisé en ce que le rapport entre le débit volumique de la substance coulante pendant l'application de la substance coulante et le débit volumique de la substance coulante pendant le retour vers le récipient (4) est déterminé par un processus d'équilibrage.
  13. Procédé selon la revendication 12, caractérisé en ce que le processus d'équilibrage ne dépend que de la longueur réglée de la section transversale de sortie (11) de la buse d'application (10), en particulier en ce que pour le processus d'équilibrage, on sélectionne une vitesse du substrat débité relativement à la buse d'application (10) et/ou l'épaisseur de la substance coulante à appliquer sur le substrat et/ou la viscosité de la substance coulante et/ou le comportement d'écoulement de la substance coulante dans une plage d'application moyenne.
  14. Procédé selon la revendication 12 ou 13, caractérisé en ce que le processus d'équilibrage se déroule de manière commandée par logiciel et automatique, en particulier en ce que d'abord toute la zone de réglage de la buse d'application (10) est parcourue, et pour des longueurs sélectionnées de la section transversale de sortie (11) de la buse d'application (10), une pression présente au niveau du capteur de pression (23) et la vitesse de rotation du mécanisme d'entraînement (13) sont établies, ensuite l'élément de réglage (22) est commuté sur la circulation, et pour les mêmes longueurs sélectionnées, dans les mêmes conditions sélectionnées, on établit les vitesses de rotation respectives du mécanisme d'entraînement (13) auxquelles respectivement la pression au capteur de pression (23) est identique à celle pendant l'application de la substance au moyen de la buse d'application (10), la pluralité de rapports établis entre le débit volumique pendant l'application de la substance coulante et la circulation étant enregistrée et utilisée par le dispositif de commande (12) lors du fonctionnement ultérieur du dispositif (1) .
  15. Procédé selon l'une quelconque des revendications 12 à 14, caractérisé en ce que lors du processus d'équilibrage lors du fonctionnement à vitesse de débit constante du substrat, l'écart en pourcentage par rapport à la pression de la substance coulante en amont de l'élément de réglage (22) entre le début de l'application et la fin de l'application de la substance coulante sur le substrat est mesuré et moyenné sur plusieurs cycles d'application, tout comme le rapport de vitesse de rotation de la pompe entre l'application de la substance coulante et la circulation de la substance coulante est modifié progressivement de manière automatique jusqu'à ce que l'écart de pression mesuré pendant l'application de la substance coulante soit minimal.
EP18164282.8A 2018-03-27 2018-03-27 Dispositif permettant l'application intermittente d'une substance coulante ainsi que procédé d'application d'une telle substance Active EP3546071B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP18164282.8A EP3546071B1 (fr) 2018-03-27 2018-03-27 Dispositif permettant l'application intermittente d'une substance coulante ainsi que procédé d'application d'une telle substance
JP2019010377A JP7335074B2 (ja) 2018-03-27 2019-01-24 流動性物質を断続的に塗布する装置およびこのような物質を塗布する方法
US16/355,823 US11273461B2 (en) 2018-03-27 2019-03-17 Device for intermittently applying a flowable substance, and method for applying such a substance
CN201910238921.4A CN110302911B (zh) 2018-03-27 2019-03-27 用于间歇性地涂覆可流动材料的设备以及用于涂覆这样的材料的方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP18164282.8A EP3546071B1 (fr) 2018-03-27 2018-03-27 Dispositif permettant l'application intermittente d'une substance coulante ainsi que procédé d'application d'une telle substance

Publications (2)

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EP3546071A1 EP3546071A1 (fr) 2019-10-02
EP3546071B1 true EP3546071B1 (fr) 2022-01-19

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US (1) US11273461B2 (fr)
EP (1) EP3546071B1 (fr)
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10695779B2 (en) * 2016-09-08 2020-06-30 Nordson Corporation Applicator having active backpressure control devices
WO2018048968A1 (fr) 2016-09-08 2018-03-15 Nordson Corporation Régulation active de recirculation de colle

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4121792A1 (de) 1991-07-02 1993-01-07 Kolbus Gmbh & Co Kg Duesenauftragssystem
DE4211942C2 (de) 1992-04-09 1995-09-07 Wallner Harald Klebstoffauftragventil
BR0115842B1 (pt) * 2000-12-01 2011-11-16 dispositivo e processo para aplicação regulada de adesivos e/ou selantes.
EP1691076A1 (fr) 2005-01-27 2006-08-16 Nordson Corporation Dispositif applicateur comprenant une pompe volumétrique
CL2009000218A1 (es) * 2008-02-11 2009-09-11 Akzo Nobel Coatings Int Bv Sistema y metodo de suministro de liquido para aplicar a un sustrato, que comprende; un tanque de liquido; unc onducto de alimentacion de liquido a una abertura de descarga; una bomba de alimentacion; una valvula para cambiar entre un modo de suministro y un modo de recirculacion, y una restriccion de area de flujo en un conducto de retorno.
EP2319707A1 (fr) 2009-11-04 2011-05-11 Müller Martini Holding AG Dispositif d'application de colle sur le dos d'un bloc de livre transporté sur une pince de transport d'un dispositif de reliure par collage, à l'aide d'une buse d'application
WO2013040147A2 (fr) * 2011-09-13 2013-03-21 Graco Minnesota Inc. Méthode de prévention du colmatage dans un système de pompage
JP5885755B2 (ja) * 2011-12-01 2016-03-15 タツモ株式会社 塗布装置および塗布方法
DE102012014974A1 (de) 2012-07-10 2014-01-16 Heidelberger Druckmaschinen Aktiengesellschaft Vorrichtung zum Auftragen von Klebstoff und Verfahren zum Betreiben einer solchen Vorrichtung
JP6074356B2 (ja) * 2013-12-18 2017-02-01 日東電工株式会社 塗工装置及び塗工膜の製造方法
JP6206230B2 (ja) 2014-02-10 2017-10-04 株式会社豊田自動織機 電極の製造方法および電極の製造装置

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EP3546071A1 (fr) 2019-10-02
CN110302911A (zh) 2019-10-08
CN110302911B (zh) 2022-06-24
US11273461B2 (en) 2022-03-15
US20190299237A1 (en) 2019-10-03
JP2019171364A (ja) 2019-10-10
JP7335074B2 (ja) 2023-08-29

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