Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
  • B26D5/005—Computer numerical control means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
  • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
  • B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
  • B26D1/14—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter
  • B26D1/143—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter rotating about a stationary axis
  • B26D1/15—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter rotating about a stationary axis with vertical cutting member
  • B26D1/151—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter rotating about a stationary axis with vertical cutting member for thin material, e.g. for sheets, strips or the like
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
  • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
  • B26D5/00—Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
  • B26D5/007—Control means comprising cameras, vision or image processing systems

Definitions

• the present invention relates to a method of developing a shear beam of a film having a thickness of less than or equal to 10 microns and an associated shear bank.
• Shear benches comprising at least one set of a blade and a counterblade configured to cut the film.
• the blade and counterblade are typically circular blades attached to respective rolls.
• the film is likely to pass through the shear bench between the rollers.
• the performance of the shear beam is not entirely satisfactory.
• the productivity of the shear bench and the quality of the film product are not optimal.
• the present description relates to a method for developing a shear bench of a film having a thickness of less than or equal to 10 micrometers, the shear beam comprising a plurality of elements, each element being characterized by a plurality of parameters, the set of parameters forming the parameters of the shearing bench, the plurality of elements comprising at least one blade assembly comprising a blade and a counterblade cooperating with the blade, a system for scrolling the film and a system for applying the blade and the counter blade against each other to shear the film, the method comprising a shear bank parameter selection step, a shear bench performance measurement step presenting the parameters chosen, to obtain a measured value for the shear bench corresponding to a shear bench evaluation criterion, and step of comparing the measured value with a desired value.
• the selection, measurement and comparison steps are repeated by modifying at least one of the parameters chosen, the at least one modified parameter being part of the parameters of each set of blades, of the scrolling system and the application system until the measured value is greater than or equal to the desired value, the method then comprising a step of selecting the selected parameters.
• the debugging method comprises one or more of the following features, taken in isolation or in any technically possible combination: the film has a first face and a second face opposite to the first face, the first face is coated with at least one layer of ink.
• the parameters are as follows: the thickness of the blade, the material of the blade, the diameter of the blade, the geometry of the blade, the thickness of the blade, the material of the blade; the counter-blade, the diameter of the counterblade, and the geometry of the counterblade.
• the parameters relating to the systems are as follows: the speed of rotation of each blade, the rotational speed of each counter-blade, the pressure applied to each blade, the pressure applied to each counterblade, the speed of movement of the film; , the film tension, the ratio of the speed of rotation of the blade with respect to the speed of rotation of the counter-blade, and the overlap of the blade with the counterblade.
• the only parameters which vary from one iteration to another are the following: the thickness of each blade, the material of each blade, the thickness of each counter-blade, the material of each counter-blade, the speed of rotation of each blade, the rotational speed of each counterblade, and the speed of the film.
• the only parameters that vary from one iteration to another are the rotational speed of each blade, the rotational speed of each counter-blade, and the speed of movement of the film.
• the only parameters which vary from one iteration to another are the following: the angle of shear formed between each blade and the film, the overlap between each blade and the counter blade cooperating with the blade, the speed of rotation of each blade, the rotational speed of each counterblade, and the speed of scrolling of the film.
• the only parameters which vary from one iteration to another are the following: the angle of shear formed between each blade and the film and the overlap between each blade and the counter blade cooperating with the blade.
• the evaluation criterion is a weighting of the following subcriteria: rate, speed, fouling, film quality, and blade life.
• the weighting is such that only the speed and fouling subcriteria are used.
• the film scrolling system comprises a first roll and a second roll, the sub-criterion of speed being determined by measuring the speed of rotating the first and second rollers and the subcriterion of fouling being measured by at least one image sensor.
• the film is PET.
• each blade comprises a knife comprising a cutting edge, the knife having a parabolic shape.
• the present description also relates to a shear bench of a film having a thickness less than or equal to 10 micrometers, the shearing bench comprising a plurality of elements, each element being characterized by a plurality of parameters, all parameters forming the parameters of the shear bench, the plurality of elements comprising at least one set of blades comprising a blade and a counter blade cooperating with the blade, a film scrolling system and a blade application system and against the blade against each other to shear the film, the shear beam having selected parameters by implementing a development method as previously described.
• FIG. 1 a schematic representation in section of an example of a shear bench
• FIG. 2 is a diagrammatic representation in section of a portion of the example of a shearing bench according to FIG. 1, and
• FIG. 3 a flow chart schematically showing a development process of the shear beam according to Figure 1.
• a shear bench 1 of a film is shown in FIG. 1.
• the shear bench 1 is configured to cut a film 2 (visible, in particular, in FIG. 2).
• the shear beam 1 is configured to cut a film 2 having one or more of the following properties.
• the film 2 has a thickness of between 4 and 10 microns, preferably less than or equal to 6 microns.
• the film 2 is, for example, made of polymer, for example of the polyamide or polyester type, such as polyethylene terephthalate, or PET.
• Film 2 is particularly bi-oriented.
• bi-oriented it is understood that the film 2 has a first face and a second face opposite to the first face.
• the first face is coated with at least one layer of ink which is in particular heat fusible.
• the ink layer on the first side is intended to be transferred during a printing on a receiving medium.
• the receiving medium is, for example, associated with an adhesion layer and / or a protective layer of the ink layer of the film 2.
• the second face of the film 2 is coated with at least one layer called back intended for protect the film 2.
• the second face has a slippery surface. In particular, the slippery surface allows scrolling under the print heads.
• the film 2 has a first PET face coated with an ink layer composed of waxes, resins and at least one pigment, such as carbon black.
• the second face is coated with a layer composed of silicone derivatives.
• the shearing bench 1 is in particular configured to cut the film 2 provided in the form of a ribbon intended to slide in a running direction D1 through the shearing bench 1.
• the shearing bench 1 is configured to cut the film 2 having a length in the direction of travel D1 between 300 meters and 1200 meters.
• a second direction D2 is defined substantially orthogonal to the direction of travel D1.
• the second direction is horizontal.
• a third direction D3 orthogonal to the direction of travel D1 and orthogonal to the second direction D2.
• the shear beam 1 comprises a plurality of elements. Each element is characterized by a plurality of parameters, the set of parameters forming the parameters of the shear bank 1.
• the shearing bench 1 comprises at least one set of blades 10, a scrolling system 12 of the film 2 and an application system 14 of the blade assembly 10.
• Each set of blades 10 comprises a blade 20 and a counter blade 21 cooperating with the blade 20 (visible in particular in Figure 2).
• Each blade 20 comprises a knife 22 comprising a cutting edge and a suspension 23 configured to apply the knife 22 against the counter blade 21.
• Each blade 20 is a circular blade.
• circular blade is meant a circle-shaped blade in a plane perpendicular to the third direction D3.
• the cutting edge has a circular shape.
• Each counterblade 21 is, for example, a ring comprising a cavity 24 configured to receive a portion of the blade 20 including the cutting edge.
• Counterblade 21 is a circular blade.
• Each blade assembly 10 includes a plurality of technical parameters.
• the parameters are technical properties of the blade 20 and against the blade 21.
• the parameters are as follows:
• the thickness of the blade 20 is defined in the third direction D3.
• the thickness corresponds in particular to that of the cutting edge of the blade 20 which is intended to be in contact with the film 2.
• the thickness of the blade 20 is equal to 0.5 millimeters (mm).
• the thickness of the counterblade 21 is defined along the third direction D3.
• the thickness of the counter blade 21 corresponds to the maximum thickness in the third direction D3.
• the diameter of the blade 20 or against the blade 21 is defined in the direction of travel D1 or in the second direction D2.
• the material of the blade 20 and against the blade 21 comprises, for example, ceramic or steel.
• the knife 22 of the blade 20 comprises, for example, essentially tungsten carbide which is preferably covered with ceramic.
• the geometry of the blade 20 is defined in particular by a shear angle formed between the blade 20 and the film 2.
• the shear angle is substantially equal to 90 degrees.
• the geometry of the blade 20 further comprises the shape of the knife 22.
• the knife 22 comprises a rectangular base terminating in a point to form the cutting edge.
• a knife 22 comprising a parabolic form is particularly advantageous for cutting the film 2.
• the thickness of the cutting edge of a parabolic knife is smaller than the thickness of the cutting edge of a linear knife.
• the scrolling system 12 of film 2 comprises at least a first roller 25 having a first axis of rotation and a second roller 26 having a second axis of rotation substantially parallel to the first axis of rotation.
• the scrolling system 12 further comprises carrying supports 28 capable of carrying the first and second rollers 25, 26.
• the first and second rollers 25, 26 are rotatable about the first and second axes respectively relative to the carrying supports 28.
• the first roller 25 is provided with blades 20 and the second roller 26 is provided with counter-blades 21.
• the scrolling system 12 further comprises drive motors 30 of the first and second rollers 25, 26.
• the speed of travel of the film 2 is defined relative to the shear bench 1.
• the scrolling speed is, for example, equal to 400 meters per minute.
• the tension of the film 2 corresponds to the physical force applied to the film 2 in the direction of travel D1 or in the third direction D3.
• the force is substantially equal to 10 Newtons.
• Application system 14 is configured to apply blade 20 and counterblade 21 against each other to shear film 2.
• the application system 14 comprises at least one displacement device 40 of the first roller 25 and / or the second roller 26 and at least one controller 42.
• the displacement device 40 comprises, for example, a vertical rail on which is mounted movable in translation an end of the first and / or second roller 25, 26.
• the displacement device 40 is configured to move the first roller 25 and / or the second roller 26 in the second direction D2.
• the displacement device 40 is configured to move the first roller 25 and / or the second roller 26 in the third direction D3.
• the controller 42 is, for example, a computer.
• the controller 42 is notably configured to send commands to the displacement device 40 and to control the operation of the displacement device 40.
• the application system 14 has, for example, the following technical parameters: the speed of rotation of each blade 20,
• the speed of rotation of each blade 20 is the speed of rotation of the first roller 25 and the speed of rotation of each counterblade 21 is the speed of rotation of the second roller 26.
• the pressure applied to each blade 20 or to each counter blade 21 is a force exerted on each blade 20 or against the blade 21.
• the applied pressure depends on a plurality of factors. For example, the pressure applied depends on the rotational speed of the blade 20 or against the blade 21 and a thickness of the film 2.
• the applied pressure is, for example, equal to 50 Newtons.
• the ratio of the speed of rotation of the blade 20 to the speed of rotation of the counterblade 21 is a technical parameter having an impact on the blade wear. In particular, when the speeds are very different, the blades 20, 21 are more worn. For example, the ratio is 5%.
• the overlap of the blade 20 with the counterblade 21 is observed in a plane perpendicular to the running direction D1. As seen, for example, in FIG. 2, a blade portion 20 is contained in the cavity 24, i.e. the blade 20 overlaps with the counterblade 21.
• the focusing method 100 is implemented, an implementation example being described in the following.
• the method comprises at least one choice step 1 10, a measurement step 120 and a comparison step 130.
• the parameters of the shear bank 1 are chosen.
• the parameters of the blade assemblies 10, the scrolling system 12 of the film 2 and the application system 14 are chosen.
• the parameters are chosen randomly, in a range of predefined values for each parameter.
• each parameter is chosen according to a shear bench available on the market.
• a table of compatible parameters is defined beforehand.
• One parameter is chosen, for example randomly, and the other parameters are defined using the table.
• the controller 42 determines a combination of parameters.
• the combination of parameters comprises a large number of variants, which implies an automated parameter definition by the controller 42.
• the performance of the shearing bench 1 having the chosen parameters is measured.
• This performance is evaluated by evaluating a plurality of physical quantities associated with the shear bank 1.
• the set of physical quantities forms a measured value.
• the measured value corresponds to an evaluation criterion.
• the evaluation criterion corresponds to one or more sub-criteria.
• the sub-criteria are, for example, the following:
• the cadence subcriterion is measured by determining the length of film 2 passed through shear bank 1 for a predefined period of time. For example, the length of the film 2 passed for 24 hours is measured. For example, when the shear bank is often off, for example for maintenance reasons, the length of the film 2 passed through the shearing bench 1 is low, other sub-criteria being kept constant.
• the sub-criterion of speed is evaluated by measuring the speed of rotation of the rollers 25, 26, for example by a tachometer.
• the subcriterion of the fouling is measured, for example, by at least one image sensor, such as a camera, in particular able to determine residues on the blade 20 and / or against the blade 21.
• at least one image sensor such as a camera
• the sub-criterion of the quality of the film 2 is evaluated by taking into account one or more factors among the homogeneity or not of the thickness of the film 2, the homogeneity or not of the width of the film 2, the straightness or not. a cutting edge of the film 2 and the fray or not the cutting edge.
• the sub-criterion of the quality of film 2 is evaluated by a user of the shear beam 1 or by a control machine provided with optical control sensors.
• the sub-criterion of the life of the blades is evaluated by measuring the correct operating time of the blade 20 and against the blade 21.
• corrected operation it is understood that the blade assembly 10 cuts the blade. film 2 according to predefined requirements concerning in particular the cutting edge.
• the Applicant has found that the life of the blades 20, 21 is decreased during heating of the blades 20, 21, for example because of a high rotational speed of the blades 20, 21.
• the value measured for the shear bank 1 corresponding to an evaluation criterion of the shear bank 1 is determined.
• the sub-criteria are combined by applying a weighting during the measurement step 120.
• the weighting includes, for example, at least one multidimensional function.
• the function includes a functional variable.
• the function includes two functional variables.
• the weighting is such that only the speed and fouling subcriteria are used.
• the measured speed is a first functional variable and the measured fouling is the second functional variable.
• the result of the function is the measured value.
• the measured value is obtained.
• the measured value is compared with a desired value.
• the desired value is preferably defined in advance of an implementation of the debugging process.
• the desired value is, for example, defined according to requirements for the shear beam 1.
• the steps of choice 1 10, measurement 120 and comparison 130 are repeated, as visible in Figure 3 symbolizing an iteration by the arrow 150.
• the at least one of the parameters selected is modified among the parameters of each set of blades 10, the scrolling system 12 and the application system 14.
• the only parameters that vary from one iteration to another are the following:
• each counterblade 21 the material of each counterblade 21,
• the only parameters that vary from one iteration to another iteration are the following:
• the shear angle between the blade 20 and the film 2 is the angle between the normal to the film 2 and the position of the blade 20.
• the previous parameters are called main parameters in the following.
• the main parameters are the parameters having the greatest impact on the performances of the shearing bench 1 among the parameters of the blade assemblies 10, of the scrolling system 12 and of the application system 14.
• the main parameters imply a variation of other parameters among the set of parameters of the blade assemblies 10, of the scrolling system 12 and of the application system 14.
• a variation of the parameters at the same time allows you to vary other parameters.
• the speed of travel of the film 2 is related to the pressure applied to each blade 20 and to the pressure applied to each counterblade 21, in particular because all the blades 10 cut, over a period of time considered. , a longer length of the film 2 if the scroll speed of the film 2 is increased.
• Steps 110, 120 and 130 are preferably repeated until the measured value is greater than or equal to the desired value.
• a selection step 140 is implemented. During the selection step 140, the parameters chosen during the last last iteration I of the method 100 are selected for the operation of the shear bank 1.
• the focusing method 100 of the shear beam 1 has a plurality of advantages.
• the subcriteria are preferably specific since only the speed and the fouling are used.
• the geometry of the films 2 obtained is not taken into account.
• the focusing method 100 thus makes it possible to obtain the desired performances of the shearing bench 1. Thanks to the focusing process 100, a shearing bench 1 having improved properties is thus obtained.
• the shear bench 1 in manual use, has a maximum speed of 500 meters per minute (the speed is clamped), a life of the blades 20 / counter-blades 21 between 5 and 8 million linear meters and allows to obtain 4000 linear meters per hour.
• the shear beam 1 has a maximum speed of between 800 meters per minute and 900 meters per minute, a life of the blades 20 / counter-blades 21 greater than or equal to 10 million linear meters and allows to obtain 10000 linear meters on time.
• the synthetic rate of return also referred to as TRS, defined as the ratio between the number of meters produced with shear bank 1 and the number of meters theoretically possible to produce with shear bank 1 is equal at 85%.

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• Engineering & Computer Science (AREA)
• Life Sciences & Earth Sciences (AREA)
• Forests & Forestry (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Nonmetal Cutting Devices (AREA)
• Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
• Control Of Cutting Processes (AREA)
• Details Of Cutting Devices (AREA)

Applications Claiming Priority (2)

Publications (3)

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Citations (4)

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• 2018
  • 2018-06-01 FR FR1854761A patent/FR3082001B1/fr active Active
• 2019
  • 2019-05-31 US US17/059,853 patent/US11358295B2/en active Active
  • 2019-05-31 EP EP19726716.4A patent/EP3802025B1/de active Active
  • 2019-05-31 JP JP2020567089A patent/JP7301074B2/ja active Active
  • 2019-05-31 WO PCT/EP2019/064166 patent/WO2019229226A1/fr not_active Ceased

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