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WO2025248379A1 - Dispositif d'étalement pour étaler un adhésif sur un film mobile - Google Patents

Dispositif d'étalement pour étaler un adhésif sur un film mobile

Info

Publication number
WO2025248379A1
WO2025248379A1 PCT/IB2025/055187 IB2025055187W WO2025248379A1 WO 2025248379 A1 WO2025248379 A1 WO 2025248379A1 IB 2025055187 W IB2025055187 W IB 2025055187W WO 2025248379 A1 WO2025248379 A1 WO 2025248379A1
Authority
WO
WIPO (PCT)
Prior art keywords
metering roller
roller
metering
coating device
adhesive
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.)
Pending
Application number
PCT/IB2025/055187
Other languages
English (en)
Inventor
Vincenzo CERCIELLO
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.)
Nordmeccanica SpA
Original Assignee
Nordmeccanica SpA
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 Nordmeccanica SpA filed Critical Nordmeccanica SpA
Publication of WO2025248379A1 publication Critical patent/WO2025248379A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/003—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating incorporating means for heating or cooling the 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
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
    • B05C1/083—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets being passed between the coating roller and one or more backing rollers
    • 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
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0826—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets
    • B05C1/0834—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line the work being a web or sheets the coating roller co-operating with other rollers, e.g. dosing, transfer rollers
    • 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
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0873—Controlling means responsive to conditions of the liquid or other fluent material, of the ambient medium, of the roller or of the work
    • B05C1/0882—Controlling means responsive to conditions of the liquid or other fluent material, of the ambient medium, of the roller or of the work responsive to the distance between two rollers, e.g. between the coating roller and a backing roller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties

Definitions

  • the present invention concerns a device for coating a moving film with an adhesive.
  • the invention concerns a coating device to be used in an apparatus for the production of flexible multilayer films.
  • the invention further concerns an apparatus for the production of multilayer film comprising such a coating device.
  • flexible films consisting of several layers, also made of different materials, bonded to one another by gluing.
  • solventless adhesives are those most widely used in this sector, particularly for packaging intended for the food industry.
  • At least two flexible films are unwound from respective reels and are conveyed towards a bonding unit.
  • a thin layer of solventless adhesive is deposited, by means of a coating assembly, on a face of one of the two films; the two films are then brought into contact in the bonding unit to create a laminated multilayer film.
  • a bicomponent solventless adhesive is used, the two components of which, typically resin and hardener, are mixed prior to application on the film and, more precisely, prior to being conveyed to the bonding machine.
  • the two components of the bicomponent adhesive are applied separately, by respective coating assemblies, on two films which are then brought into contact with the respective coated sides of the adhesive components, to form a multilayer laminated film.
  • the coating of the film with the adhesive is one of the most delicate steps in the process of production of a multilayer film since the quality of the finished product depends on it.
  • the thickness of the layer of adhesive between the two bonded films is extremely fine, typically between 0.5 micron and 5 micron, corresponding to approximately 0.5 - 5 g/m 2 , with the solventless adhesives currently used.
  • the thickness of the layer of coated adhesive To guarantee both the mechanical performance (resistance to peeling), and above all the aesthetic/optical characteristics of the multilayer film, it is fundamental for the thickness of the layer of coated adhesive to correspond to the scheduled nominal value (the variation in the thickness of the adhesive layer must not exceed 10% of the nominal value of the thickness, namely a few tenths of a micron) and to be maintained constant throughout the production process of a single batch of film, which can involve even thousands of metres of film per production batch.
  • a coating assembly of the known art is schematically illustrated, which generally comprises a first metering roller DI, a second metering roller D2, facing the first one, a conveyor roller TR which rotates in contact with the second metering roller D2 and a coating roller SP which rotates in contact with the conveyor roller TR and with a face of a layer of film F.
  • a chamber is defined in the upper part where an adhesive is deposited which remains in contact with a part of the outer surface of both the metering rollers.
  • the surfaces of the metering rollers DI, D2 are spaced by a gap of a few hundredths of a millimetre so that, following the relative rotation of the surfaces of the two rollers, the adhesive is laminated through the gap and a thin uniform layer remains adhering to the surface of the second metering roller D2. From the latter, the adhesive is transferred to the conveyor roller TR and then to the coating roller SP, reducing the thickness of the adhesive each time until it is coated on the film.
  • Said known devices further comprise an adjustment device, not illustrated, which allows at least the first metering roller to be moved with respect to the second metering roller to vary the width of the gap and, therefore, the thickness of the adhesive layer taken from the second metering roller, and consequently the thickness coated on the film.
  • the coating assemblies that operate with bicomponent solventless adhesives are in fact equipped with heating means to bring the surface of the rollers to a temperature generally between 30°C and 90°C, thus maintaining the adhesive at a predefined operating temperature.
  • Said heating causes a radial expansion of the rollers in the operating condition, with respect to the non-operating condition at ambient temperature, which significantly affects the width of the gap.
  • a further aspect that makes the control of said coating assemblies complex is the fact that it is not possible to directly measure the width of the gap when the device is working, namely with the rollers in rotation covered with adhesive, with the known measuring instruments, whether optical, inductive or of other type.
  • Said control mainly visual, moreover, must last for the entire duration of the production process.
  • a control of the gram weight can be scheduled; this is performed by taking samples of standardized dimensions of the multilayer film (bonded) from the wound reel, weighing said sample with a precision balance and, after delaminating the film and removing all the coated adhesive, re-weighing the cleaned layers of film so as to calculate the gram weight as the differential value between the two weights.
  • This operation takes time, particularly if it has to be performed several times to complete adjustment of the machine in several steps, slowing down production and generating potential waste.
  • the object of the present invention is to propose a device for coating a film with an adhesive that overcomes the above-mentioned drawbacks of the known art.
  • the object of the present invention is to propose a coating device that allows the thickness of the layer of an adhesive applied to a moving film to be controlled in a precise automatic manner.
  • the object of the present invention is to provide a coating device in which said adjustment precision is independent of the ability and experience of the operator.
  • a further object of the present invention is to make available a coating device that guarantees the repeatability of said coating process parameters.
  • a further object of the present invention is to make available a coating device equipped with an adjustment device for adjusting the gap between the metering rollers which is simpler to control.
  • the object of the present invention is also to make available an apparatus for the production of a multilayer film equipped with the above-mentioned coating device.
  • the device according to the invention is adapted to be used in an apparatus for the production of a flexible multilayer film, namely a bonding or laminating machine.
  • the coating device can be integrated in said apparatus as a fixed station or can be provided in the form of a movable carriage, so that it can be installed and removed from the apparatus rapidly according to requirements.
  • the coating device comprises: at least one first metering roller; and at least one second metering roller, facing the first and which can rotate in contact with an adhesive; in which the surface of the first metering roller is spaced from the surface of the second metering roller by a gap such that, following the rotation of said second metering roller, a portion of its surface is coated with a uniform layer of adhesive.
  • the angular position of the first metering roller is preferably fixed during operation.
  • the device of the present invention generally also comprises a conveyor roller, which rotates in contact with the second metering roller, and a coating roller that rotates in contact with the conveyor roller and, in general, with a face of a layer of film to be coated.
  • the first metering roller and the second metering roller are arranged with their respective axes parallel and are supported at their ends by respective shoulders of the coating device.
  • the first metering roller is mounted on said shoulders via sliding means, adapted to allow the movement thereof in a direction orthogonal to its axis. Said movement direction of the first metering roller is preferably, but not necessarily, horizontal.
  • said sliding means for example slides, carriages or similar, are coupled to support shafts arranged at the ends of the roller.
  • the coating device further comprises heating means for heating the surface of the first metering roller and second metering roller.
  • the coating device further comprises measuring means for measuring a temperature parameter of the surface of the first metering roller and second metering roller.
  • the coating device further comprises an adjustment device which controls the movement of the first metering roller, with respect to the second metering roller, to vary the width of the gap and, therefore, the thickness of the layer of adhesive transferred to the surface of the second metering roller.
  • Said adjustment device cooperating with the above-mentioned sliding means, comprises motor means and, possibly, a transmission.
  • each of the sliding means at the ends of the first metering roller is associated with respective motor means, which can be operated in a synchronized manner or, if necessary, independently so as to micrometrically adjust also the angle between the axes of the first metering roller and second metering roller.
  • the coating device further comprises measuring means, preferably associated with the sliding means, adapted to detect at least one parameter relative to the longitudinal position of said first metering roller, namely with respect to the direction of movement.
  • each of the sliding means is associated with a measuring means to detect said position parameter for each lateral end of the first metering roller.
  • said adjustment device is controlled by a control unit, which is configured to control the motor means as a function of the temperature parameter of the first metering roller, the second metering roller or both, and at least one position parameter of the first metering roller.
  • the adjustment device can regulate in an automatic and extremely accurate manner the position of the first metering roller, therefore the width of the gap between the two metering rollers and, consequently, the thickness of the layer of adhesive coated on the film.
  • control unit can receive in real time the datum relative to the temperature parameter of the metering rollers, said unit is configured to control the motor means of the adjustment device in such a way as to compensate for the thermal expansions of said rollers.
  • the adjustment device can operate in a substantially automatic manner.
  • control unit comprises a memory unit in which a dataset is stored comprising a list of values of the temperature parameter of the metering rollers (preferably one single value considering the substantially identical temperatures of the metering rollers), where each temperature value is associated with a position parameter value of one or both the measuring means associated with the sliding means.
  • the minimum and maximum temperatures in said dataset correspond respectively to the ambient temperature and maximum operating temperature, generally approximately 80-90°C.
  • the gap adjustment device comprises a motor, preferably a brushless gearmotor assembly, which drives a recirculating ball screw mechanism. Between the motor and the recirculating ball screw mechanism, a drive with belt and pulleys is interposed. The shaft of the recirculating ball screw mechanism is operated by a driven pulley, whereas the ball nut is rigidly connected to the sliding means of the first metering roller.
  • the gearmotor assembly furthermore, is preferably equipped with an integrated braking device.
  • the motor-transmission assembly thus configured is characterized by reduced play/tolerances and by a considerable resistance to the retrograde motion of the first metering roller, thus guaranteeing a high positioning precision.
  • the coating device can comprise a braking device, for example of pneumatic or electromagnetic type, configured to cooperate directly with the slides of the sliding means, to maintain the position of the first metering roller.
  • a braking device for example of pneumatic or electromagnetic type, configured to cooperate directly with the slides of the sliding means, to maintain the position of the first metering roller.
  • the measuring means of the position parameter of the first metering roller comprise a linear measurement sensor.
  • said sensor comprises two mutually sliding parts, cooperating respectively, directly or indirectly, with the shoulders of the device and with the sliding means.
  • Said configuration allows the actual movement of the first metering roller to be detected.
  • said linear measurement sensor is positioned “at the tail end” of the kinematic chain of the drive, the effect of any mechanical play of the transmission components can be disregarded.
  • the measuring means thus configured therefore allow a much more accurate measurement of the position parameter than many known solutions where, for example, an encoder is used associated with the gearmotor.
  • the parts of the sensor are fixed to the sliding means and to the shoulders of the device (which can reach temperatures of even 50-60°C) by means of supports made of a material with low thermal conductivity, preferably a thermoplastic polymer.
  • the heating means of the metering rollers comprise a source of a heated fluid (typically water, possibly with the addition of glycol or similar) which is made to circulate inside chambers or passages obtained in the metering rollers.
  • each metering roller comprises a fluid inlet and a fluid outlet at the ends of the roller, more precisely at the free ends of the support shafts.
  • Said inlet and outlet can be arranged each at the respective ends or, according to a preferred variation, both at the same end.
  • the measuring means of the temperature parameter comprise a pair of temperature probes located at the heated fluid inlet and outlet of each roller.
  • Another embodiment considers the stabilized temperature, and therefore expansion, when the difference between the nominal operating temperature Tset and the temperature detected at the outlet To remains below a predefined threshold value (for example not exceeding 2-3 °C) for a predefined time.
  • a predefined threshold value for example not exceeding 2-3 °C
  • the adjustment phase more precisely the movement phase of the first metering roller in the predefined work position, is carried out only when the thermal expansion of the two metering rollers has been stabilized.
  • the coating device can further comprise at least one further sensor of optical type adapted to measure the quantity of adhesive coated on the film.
  • Said optical sensor is therefore downstream of the coating roller or, in any case, prior to the bonding unit of the multilayer film production apparatus, where the two films are bonded.
  • Said at least one measurement sensor of the adhesive thickness is connected to the control unit.
  • the latter is configured to receive the value relative to the quantity of adhesive coated on the film and, according to said value, to control in feedback one or more parameters of the coating device to correct any deviations of the value detected with respect to a predefined nominal value.
  • control unit is configured to vary the rotation speed of the conveyor roller or, possibly, of the coating roller of both. Said variation determines a reduction or an increase in the adhesive transferred to the coating roller and, therefore, onto the film.
  • said optical sensor is configured to detect the measurement of the quantity of adhesive in several points along a direction transverse to the film unwinding direction.
  • control unit is further configured to command operation of the adjustment device motor means.
  • the angle between the axes of the first and second metering roller can be varied in order to obtain the coating of a uniform layer throughout the width of the film.
  • the first metering roller is mounted rotatable around its own axis so that it can be rotated during washing and/or maintenance operations. Said rotation is imparted by a motor, typically a motor gearbox unit, associated with an encoder which provides a datum relative to the angular position of said first metering roller.
  • a motor typically a motor gearbox unit
  • said first metering roller is kept blocked in rotation during operation.
  • the calibration dataset (of positioning and temperature) stored in the control unit refers to a precise area (theoretically a geometric line) of the surface of the first metering roller.
  • each dataset refers to a given angular work position of the first metering roller measured by said encoder.
  • the first metering roller work in several angular positions (for example by periodically varying the position) thus avoiding excessive wear on one single area of the surface.
  • the motor that rotates said roller is preferably equipped with a braking device.
  • FIG. 1 shows a schematized lateral view of the coating device according to the present invention
  • FIG. 3 shows a perspective view from a first side of the coating device according to the present invention
  • figure 4 shows another lateral perspective view, from an opposite side, of the coating device of figure 3;
  • figure 5 shows a perspective view of the coating device of figure 3, in a partially assembled condition
  • FIG. 6 shows a perspective view of a detail of the coating device of figure 3, in a partially assembled condition
  • figure 7 shows a front view of a detail of the coating device of figure 3, in a partially assembled condition
  • FIG. 8 shows a flow chart illustrating a calibration procedure of the coating device according to a variation of the present invention
  • FIG. 9 shows a flow chart illustrating a calibration procedure of the coating device according to another variation of the present invention.
  • FIG. 10 shows a flow chart illustrating a setting procedure of the coating device according to the present invention.
  • the number 1 indicates overall a device for coating a moving film with adhesive.
  • adhesive we mean an adhesive composition in fluid or paste form.
  • the coating device comprises a first metering roller 10 and a second metering roller 11, arranged parallel and facing each other.
  • the first metering roller 10 is preferably kept blocked in rotation during operation of the apparatus.
  • the second metering roller 11 is rotated with respect to the first one in a rotation direction indicated by the arrow Rd (fig. 2).
  • the outer surface of the metering rollers 10, 11 is preferably smooth and coated in, or made of, chrome-plated steel.
  • a chamber 12 is defined in which an adhesive can be deposited in contact with a part of the outer surface of both the rollers.
  • the metering rollers 10, 11 are preferably provided with heating means to heat the outer surface.
  • the surfaces of the metering rollers 10, 11 are spaced by a gap of a few hundredths of a millimetre (generally 0.07-0.08 mm) so that, following the rotation of the second metering roller with respect to the first, the adhesive is laminated through the gap and a thin uniform layer remains adhered to the surface of the second metering roller 11. Said layer of adhesive, by means of one or more further rollers that rotate in contact with the second metering roller 11, is transferred to a moving film S.
  • the coating device comprises a further conveyor roller 13 which rotates in contact with the second metering roller 11 in an opposite rotation direction Rt.
  • the conveyor roller 13 is preferably coated with a layer of vulcanized rubber.
  • the job of the conveyor roller 13 is to collect the layer of adhesive from the second metering roller 11 and transfer it to a coating roller 14 which rotates in contact with it in an opposite rotation direction Rs.
  • the coating roller 14 in turn, is placed in contact with the layer of moving film S, on which the adhesive is spread in a continuous uniform layer.
  • the rotation speed of the coating roller 14 is greater than that of the conveyor roller 13 which, in turn, is greater than that of the second metering roller 11. Said speed increase allows the thickness of the adhesive layer that is deposited on the surface of the rollers, and subsequently on the layer of film, to be gradually reduced.
  • the second metering roller 11 and the conveyor roller 13 are rotated by a single motor 50 which, by means of a belt transmission 51, drives two reducers 52, 53 connected to the second metering roller 11 and to the conveyor roller 13 respectively (fig. 3).
  • the coating roller 14, is rotated by a motor 60 via a belt transmission 61 (fig. 4).
  • the first metering roller 10 comprises a central working portion 10a comprised between two support shafts 10b (fig. 3, 5, 7) by means of which it is supported by respective shoulders 70 of the coating device 1.
  • the second metering roller 11 comprises a central working portion I la and two support shafts 1 lb by means of which it is supported by the shoulders 70.
  • first metering roller 10 is supported by sliding means, configured to translate along a direction Dr substantially orthogonal to the axis of said first metering roller 10.
  • said sliding means comprise a pair of slides 30 each slidingly mounted on a respective shoulder 70 of the coating device.
  • Each slide 30 is equipped with a support 31 (typically a bearing) which houses a support shaft 10b of the first metering roller 10.
  • the gap namely the minimum distance between the surfaces of the metering rollers 10, 11, can be adjusted by means of an adjustment device, thus varying the thickness of the layer of adhesive taken from the second metering roller 11 and, consequently, the thickness of the adhesive layer applied to the film S.
  • Figure 6 illustrates a detail of the coating device showing the above-mentioned adjustment device, indicated overall by the number 20.
  • said adjustment device acts on the first metering roller 10 moving it with respect to the second metering roller 11, the rotation axis of which is fixed.
  • the adjustment device 20 is configured to move the slides 30 along the direction Dr by a few hundredths of a millimetre, to adjust said gap.
  • the adjustment device 20 comprises a brushless gearmotor assembly 21 rigidly fixed to the shoulders 70 of the coating device.
  • the outlet shaft of said gearmotor assembly is connected to a motor pulley 22 which, by means of a belt 23, operates a driven pulley 24.
  • Said driven pulley 24, in turn, is connected to a shaft 26 of a mechanism with recirculating ball screw 25.
  • the ball nut 27 of the recirculating ball screw 25 is rigidly connected to the slide 30.
  • Said adjustment device 20 is provided at both ends of the first metering roller 10. Each adjustment device 20 can therefore control the movement of the respective slide 30.
  • the coating device 1 is equipped with a linear measurement sensor 28 which is fixed or resting on the shoulder 70 and on the slide 30. More precisely, said sensor 28 has a body 28a, which is fixed to the shoulder 70, and a feeler 28b which rests on the slide 30.
  • Said parts of the sensor 28 are fixed or rest on the slide 30 and shoulder 70 of the device by means of supports 29 made of polyether ether ketone (PEEK).
  • Said material has both a reduced thermal conductivity, so as not to transmit the heat from the shoulders 70 and from the slides 30 to the sensors 28, and a high elastic modulus, which allows a high precision to be maintained in the reading of the movements of the slide 30.
  • the first metering roller 10 is mounted rotatable around its axis in the slides 30. As already mentioned, said rotation is necessary for carrying out the washing operations.
  • the support shaft 10b of the first metering roller 10 is connected to an asynchronous gearmotor 40, which is coupled to an encoder 41, to allow precise identification of the angular position of said first metering roller 10 and therefore the area of its surface that faces the second metering roller 11.
  • Said gearmotor 40 is equipped with a braking device integrated in the motor itself (not indicated in the figures) to keep the first metering roller 10 perfectly blocked in rotation during operation.
  • the gap adjustment device 20 is controlled by a control unit of the coating device, not illustrated in the figures.
  • the control unit generally integrated in the PLC module of the multilayer film production apparatus, has a calibration dataset which enables the unit to autonomously control the adjustment device 20 to arrange the metering rollers 10, 11 at the correct predefined working distance.
  • control unit comprises a memory unit in which datasets are stored relative to the parameters of temperature of the metering rollers 10, 11 and position of the first metering roller 10.
  • Each dataset is associated with an angular position of the first metering roller 10.
  • the angular positions with which a dataset is associated are between 2 and 16, preferably between 4 and 8. Said positions are in general angularly equally spaced.
  • Figure 8 shows a flow chart that describes an example of a calibration procedure via which it is possible to identify and record the values of the temperature and position parameters for the above-mentioned datasets.
  • Said procedure comprises the following steps: a) the metering rollers 10, 11 are brought to a predefined distance (generally at least 1 mm, using a feeler gauge for the identification); b) the metering rollers 10, 11 are brought to an initial predefined temperature (a maximum operating temperature, for example 90°C, or a minimum operating temperature, for example 30°C); c) the metering rollers 10, 11 are moved closer or farther away until the distance detectable with the feeler gauge, inserting the latter between said metering rollers, is equal to a defined value, for example 0.08 mm; d) when the resistance of the feeler gauge located between the two metering rollers 10, 11 is correct, the value of the position parameter of the first metering roller 10 is recorded and said value is associated with the respective temperature; e) the temperature is reduced (if starting from the maximum temperature) or increased (if starting from the minimum temperature) by a predefined value with respect to the previous one (for example by 5°C or 10 °C); f) steps c),
  • step c) The movement of the rollers in step c) is carried out by a manual command that operates the motor means of the adjustment devices 20.
  • the distance is measured with the feeler gauge in several points to ascertain that it is constant throughout the transverse extension of the rollers.
  • Said distance test via the use of the feeler gauge is performed when the reading of the temperature value with the respective measuring means corresponds to the predefined nominal value, namely when the temperature of the metering rollers is stabilized.
  • the recorded position parameter value generally corresponds to the reading value of the linear sensor 28. Said recording is preferably carried out for both the adjustment devices at the respective ends of the roller.
  • the dataset relative to the temperature and position parameters can be recorded directly in the storage unit of the control unit or at a later time.
  • control unit is able to command the adjustment devices 20 to bring the first metering roller 10 to the correct position so that, for a given operating temperature, the value of the gap corresponds to the scheduled nominal value.
  • Figure 9 shows a flow chart that describes another example of a calibration procedure via which the values of the temperature and position parameters for the above- mentioned datasets are recorded.
  • the position parameter of the first metering roller, for each temperature step is detected for several points on the surface of said first metering roller 10.
  • the position parameters are detected and recorded by arranging the first metering roller 10 in different angular positions.
  • Said procedure therefore entails the following steps: the metering rollers 10, 11 are brought to a predefined distance (generally at least 1 mm, using a feeler gauge for the detection) and the first metering roller 10 is set to a known angular position; the metering rollers 10, 11 are brought to an initial predefined temperature (a maximum operating temperature, for example 90°C, or a minimum operating temperature, for example 30°C); the metering rollers 10, 11 are moved closer or farther away until the distance detectable with the feeler gauge, inserting the latter between said metering rollers, is equal to a defined value, for example 0.08 mm; when the resistance of the feeler gauge positioned between the two metering rollers 10, 11 is correct, the value of the position parameter of the first metering roller 10 is recorded and said value is associated with the respective temperature; dl) the first metering roller is rotated by a known angle (for example 45°, 90°, etc.); d2) steps c), d) and dl) are
  • Figure 10 shows a flow chart that describes an operating mode for setting the coating device.
  • the setting entails the following steps: a) the operating temperature of the metering rollers 10, 11 is set in the heating means; b) when the temperature of both metering rollers 10, 11 detected with the measuring means is stable and equal to the set value, a command is given for positioning the first metering roller 10; c) the adhesive is fed into the coating device.
  • step b) the control unit, according to the selected operating temperature and possibly the angular position of the first metering roller 10, calculates the correct value that must be read by the linear measurement sensors 28 so that the first metering roller 10 is spaced from the second metering roller 11 by the chosen gap.
  • the control unit then gives the command to the adjustment devices 20 to move said first metering roller 10 to the calculated position. If necessary, the operator can carry out a further safety check with a feeler gauge before introducing the adhesive into the coating device.

Landscapes

  • Coating Apparatus (AREA)

Abstract

La présente invention concerne un dispositif de revêtement, destiné à revêtir un film mobile d'une couche d'adhésif, comprenant au moins un premier rouleau de dosage, au moins un deuxième rouleau de dosage, faisant face au premier et qui peut tourner en contact avec un adhésif, lesdits rouleaux étant chauffés, et un dispositif de réglage pour commander le mouvement du premier rouleau de dosage par rapport au deuxième rouleau de dosage ; ledit dispositif de revêtement comprenant en outre des moyens de mesure conçus pour détecter au moins un paramètre relatif à la position dudit premier rouleau de dosage par rapport aux épaulements de la machine et où ledit dispositif de réglage est commandé par une unité de commande destinée à commander des moyens moteurs du dispositif de réglage en fonction du paramètre de température des rouleaux de dosage et du paramètre de position du premier rouleau de dosage.
PCT/IB2025/055187 2024-05-27 2025-05-19 Dispositif d'étalement pour étaler un adhésif sur un film mobile Pending WO2025248379A1 (fr)

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IT202400012004 2024-05-27
IT102024000012004 2024-05-27

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WO2025248379A1 true WO2025248379A1 (fr) 2025-12-04

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0324892B2 (fr) 1987-10-30 1998-09-30 NORDMECCANICA S.p.A. Machine pour coller des films en matière plastique avec dispositifs d'étendage pour matière adhésive
EP2085218B1 (fr) 2008-01-30 2014-09-03 NORDMECCANICA S.p.A. Machine de lamination de plusieurs couches de films fabriqués de matériaux différents et procédé correspondant
EP3454995A1 (fr) 2016-05-10 2019-03-20 Nordmeccanica SpA Dispositif d'étalement d'un adhésif sur un film et appareil de production d'un film multicouche muni dudit dispositif d'étalement
EP2978603B1 (fr) * 2013-03-27 2019-07-03 Nordmeccanica SpA Unité d'application d'adhésif sur un film mobile
CN113909050A (zh) * 2021-11-03 2022-01-11 中化国际(控股)股份有限公司 涂布面密度控制装置、涂布机和涂布面密度控制方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0324892B2 (fr) 1987-10-30 1998-09-30 NORDMECCANICA S.p.A. Machine pour coller des films en matière plastique avec dispositifs d'étendage pour matière adhésive
EP2085218B1 (fr) 2008-01-30 2014-09-03 NORDMECCANICA S.p.A. Machine de lamination de plusieurs couches de films fabriqués de matériaux différents et procédé correspondant
EP2978603B1 (fr) * 2013-03-27 2019-07-03 Nordmeccanica SpA Unité d'application d'adhésif sur un film mobile
EP3454995A1 (fr) 2016-05-10 2019-03-20 Nordmeccanica SpA Dispositif d'étalement d'un adhésif sur un film et appareil de production d'un film multicouche muni dudit dispositif d'étalement
EP3454995B1 (fr) * 2016-05-10 2021-03-24 Nordmeccanica SpA Dispositif d'étalement d'un adhésif sur un film et appareil de production d'un film multicouche muni dudit dispositif d'étalement
CN113909050A (zh) * 2021-11-03 2022-01-11 中化国际(控股)股份有限公司 涂布面密度控制装置、涂布机和涂布面密度控制方法

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