• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Film stretching machine, comprising an oven (1), in which passes a strand of an endless chain of tongs (4) driven by at least one toothed wheel (8), characterized in that at least one wheel Toothed (8) is inside the furnace (1), is rotated by its own geared motor (9) wrapped in a housing (12), placed in the furnace (1) and cooled by means (13, 14), and is mounted on its own displacement device (11), so as to move from a recessed position, in which it does not mesh with the chain, to a driving position, in which meshes with the chain.
    公开号:FR3038247A1
    申请号:FR1501376
    申请日:2015-06-30
    公开日:2017-01-06
    发明作者:Gilbert Trivero
    申请人:Andritz Biax SAS；
    IPC主号:
    专利说明:

    Film stretching machine
    The present invention relates to machines for stretching films or sheets, especially plastic films, and more particularly machines of this kind simultaneously stretching a film. The invention is particularly applicable for simultaneous angular stretching. The preheated plastic is stretched simultaneously longitudinally and transversely with a drawing angle in the stretched film which is different from 90 °, being for example 45 ° or 135 °. The simultaneous angular drawing can be carried out using a machine comprising two endless paths entering and leaving a furnace by diverging therefrom and each comprising a first rail, on which tongs move, and a second rail, on which move articulated carriages, in a chain pulled by a toothed wheel disposed outside the oven, to two consecutive clamps. The articulation of each carriage with two consecutive clamps makes it possible to adjust the pitch of the clamps, that is to say their mutual distance along the track.
    These machines can have a very large length in the tensile direction of the chain, several tens of meters, for example from thirty to forty meters. In particular, when the film to be stretched is relatively thick, for example having a thickness of the order of 100 microns, the force to be provided by a gear wheel placed outside the furnace for pulling the chain is too great. The radial forces on the rails are enormous. It follows a deviation of the pitch of the clamps. The inaccuracy of the pitch of the clamps affects the regularity of the stretching and thus the optical qualities of the films obtained.
    The machine according to the invention overcomes this disadvantage by making it possible, even for thick films, to produce films of better optical quality.
    The film stretching machine according to the invention, in particular of the above type, comprises an oven, in which passes a strand of an endless string of tongs driven by at least one toothed wheel. It is characterized in that at least one gearwheel is inside the furnace, is rotated by its own gear motor wrapped in a housing, placed in the oven and cooled by cooling means, and is mounted on its own moving device, so as to move from a recessed position, in which it does not mesh with the chain, to a driving position, in which it meshes with the chain.
    The furnace having a temperature of about 200 ° C, it had not been believed until now that it was possible to put a gear wheel that can work properly. But, if the gear wheel is rotated by a gear motor wrapped in a housing, put in the oven and cooled by cooling means, mounting is reliable. The geared motor and its electronic control components are protected by the housing from excessive heating which would impair their operation, while the gear wheel, which is out of the housing, but whose operation is purely mechanical, can withstand these high temperatures.
    Preferably, there are several gear wheels inside the furnace, preferably each having at least five teeth. Each wheel has its own geared motor, which has its own housing.
    To solicit the clamp as little as possible mechanically, it is good to associate it in the chain to a carriage having a roller which enters the toothed wheel of the inside of the furnace. In general, the carriage rollers have a vertical axis and the clamps close at a set point of their pitch outside the oven.
    Preferably, the displacement device is a translation device in a direction perpendicular to the chain.
    In general, the gear wheels inside the oven assist in pulling the chain one or more gear wheels outside the oven.
    A machine according to the invention normally has two chains diverging from each other in the oven, the clamps of one of the chains moving on first rails and the carriages of the same chain on second rails, this being valid for each channel.
    To make the machine easy to start, each toothed wheel has its own detector, which detects the pitch of the wheel teeth, the chain has a sensor specific to each wheel, which detects the pitch of the clamps at the point where the gear wheel will mesh with it, and a central control unit of the machine is connected to the sensor and the detector and, when the steps coincide, controls the displacement device to put the wheel in the driving position. This prevents a breakage of mechanical parts that would cause desynchronization.
    The control is all the more reliable as the power supply son of the geared motor come out of the housing by the inlet, in the housing, the cooling air of the cooling means and that, in the input, the son are surrounded by a common sleeve, itself surrounded at a distance by a thermally insulating sheath. The invention also relates to a method of starting a film-stretching machine, characterized in that, while the wheels are recessed, the adequacy of the pitch of the teeth of each wheel is checked with the pitch of the grippers. the place where each wheel must mesh with the chain and, if appropriate, the rotational speeds of the wheels are synchronized at low speed at the speed of movement of the chain, then the wheels are put in the position of drive and we increase all speeds in synchronism.
    In the accompanying drawings, given solely by way of example: FIG. 1 is a diagrammatic plan view of a machine according to the invention, the top of the oven being removed; Fig. 2 is a plan view of the portion of the stretching machine having a pair of inner gears; Figure 3 is a sectional view along the line III-III of Figure 2 and Figure 4 is a perspective view of a portion of a chain of a machine according to the invention.
    The film stretching machine according to the invention has a temperature controlled oven 1, in which strands of two identical paths pass. Each lane has a first inner rail 2 and a second outer rail 3, which are parallel on one strand and then divergent. Rails 2 and 3 are endless. On the first rail 2, move a multitude of clamps 4, which close at a set point of the step under a fixed clamp closure bar. The film F to be stretched is held by the two opposite edges by the clamps 4, which may be as described in French Patent 2,686,041. On the second rail 3, carriages 5 are moved. The carriages 5 are articulated, in one chain, driven by four toothed wheels 6 outside the oven 1, the clamps 4. Two consecutive clamps 4 are articulated to the same carriage 5 by two rods 7, so as to adjust the pitch of the clamps 4, that is to say that is to say their mutual distance, when the angle between the two rods 7 changes. The carriages 5 roll by a vertical roller bearing against the outer rail 3.
    In addition to the four drive wheels 6 of each chain outside the furnace 1, there are, inside the furnace, six 8 toothed drive wheels of each chain.
    FIG. 2 represents one of these toothed wheels 8 driven by its own geared motor 9 and mounted in translation by pads 10 on a rail 11, so as to be able to pass from a retracted position, represented in dotted lines, in which it does not mesh with the chain, at a driving position, in which it meshes with the chain. The geared motor 9 is disposed inside a housing 12. The housing 12 is inside the oven 1. It is cooled by cooling air arriving through an inlet 13 and emerging through an outlet 14.
    It is associated with each toothed wheel 8 its own detector 15, which detects the pitch of the teeth. And it is associated with each toothed wheel a sensor 16, which detects the pitch of the clamps 4 at the place where the toothed wheel 8 will mesh in the chain or near this place, preferably just upstream in the direction of moving the chain.
    The two power supply wires 17 of the geared motor 9 leave the housing 12 through the outlet 13, being surrounded by a sleeve 18, itself surrounded at a distance from an insulating sheath 19, the cooling air penetrating to the inside of the housing 12 in the gap between the sleeve 18 and the sheath 19. Outside the furnace 1, there is a control unit 20, which receives information from the detectors 15 of each of the toothed wheels 8 and sensors 16 associated with each toothed wheel 8 and controls the devices 11 for moving the toothed wheels 8, to make them mesh with the chain, after the adequacy of the pitch of the teeth of the toothed wheel 8 to the pitch of the clamps to the place of the chain where the wheel 8 must mesh has been controlled and after the speeds of the wheel 8 and the chain have been synchronized. If there is adequation, it synchronizes the speed of rotation of the wheels 8 to the speed of movement of the chain at low speed, the wheels 8 are placed in the driving position, in which they mesh with the chain, then increase all speeds in synchronism. If there is no adequation, we change the toothed wheel 8 and we repeat the steps above.
    权利要求:
    Claims (8)
    [1" id="c-fr-0001]
    Film stretching machine, comprising an oven (1), through which a strand of an endless chain of tongs (4) driven by at least one toothed wheel (8) is driven, characterized in that at least one a wheel (8) toothed: is inside the oven (1), is rotated by its own geared motor (9) wrapped in a housing (12), put in the oven (1) and cooled by means Cooling means (13, 14) and is mounted on its own displacement device (11) so as to move from a recessed position, in which it does not mesh with the chain, to a driving position, which it meshes with the chain.
    [2" id="c-fr-0002]
    2. Machine according to claim 1, characterized in that the displacement device (11) is a translation device in a direction perpendicular to the chain.
    [3" id="c-fr-0003]
    3. Machine according to claim 1 or 2, characterized in that each toothed wheel (8) has its own detector (15), which detects the pitch of the teeth of the toothed wheel (8).
    [4" id="c-fr-0004]
    4. Machine according to one of claims 1 to 3, characterized in that the chain has a sensor (16) specific to each toothed wheel (8), which detects the steps of the clamps (4) at the location of the chain where the toothed wheel (8) must mesh with the chain.
    [5" id="c-fr-0005]
    5. Machine according to claims 3 and 4 taken together, characterized in that a central control unit (20) of the machine is connected to the sensor (16) and the detector (15) and, when the steps it detects coincide, controls the displacement device to put the toothed wheel (8) in the driving position.
    [6" id="c-fr-0006]
    6. Machine according to one of claims 1 to 5, characterized in that the power supply son (17) of the geared motor (9) out of the housing (12) through the inlet (13), in the housing (12). ), cooling air cooling means.
    [7" id="c-fr-0007]
    7. Machine according to claim 6, characterized in that, in the inlet (13), the son (17) are surrounded by a sleeve (18) common, itself surrounded at a distance of a sheath (19) thermally insulating.
    [8" id="c-fr-0008]
    8. A method of starting a film stretching machine according to claims 1 or 2 and 3 to 5, characterized in that, while the wheels are recessed, the adequacy of the steps of the teeth is checked of each wheel with the pitch of the clamps at the place where each wheel must mesh with the chain and, if there is adequation, one synchronizes at low speed the speeds of rotation of the wheels with the speed of displacement of the chain, then the wheels are put in the driving position and all the speeds are increased in synchronism.
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    BE377132A|
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    同族专利:
    公开号 | 公开日
    CN107810101A|2018-03-16|
    FR3038247B1|2017-08-04|
    CN107810101B|2019-08-13|
    US20180290370A1|2018-10-11|
    WO2017001068A1|2017-01-05|
    JP2018519188A|2018-07-19|
    EP3317080A1|2018-05-09|
    EP3317080B1|2019-09-04|
    JP6466601B2|2019-02-06|
    KR20180026483A|2018-03-12|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US2412187A|1943-08-17|1946-12-03|Plax Corp|Process and apparatus for producing continuous sheet of biaxially oriented organic polymer|
    FR2922810A1|2007-10-24|2009-05-01|Darlet Marchante Tech Sa|Synthetic film i.e. elongated strip, drawing method for fabricating e.g. condenser, involves displacing heads parallel to longitudinal direction of film with increase in distance between successive heads to realize longitudinal drawing|
    FR2924048A1|2007-11-28|2009-05-29|Darlet Marchante Tech Sa|Film stretching method, involves scrolling film across transversal stretching zones to stretch film in continuous manner, and retracting film in longitudinal direction and stretching film in transversal manner simultaneously|
    DE102012025487A1|2012-12-20|2014-06-26|Brückner Maschinenbau GmbH & Co. KG|Transport system, in particular Querreckanlage|
    DE3503909C1|1985-02-06|1986-01-09|Erwin Kampf Gmbh & Co Maschinenfabrik, 5276 Wiehl|Simultaneous biaxial stretching machines for thermoplastic film webs|
    JP2735358B2|1990-05-07|1998-04-02|株式会社日立製作所|Simultaneous biaxial stretching device for sheet material|
    JPH05421U|1991-06-25|1993-01-08|三菱重工業株式会社|Endless chain drive for drawing machine|
    FR2686041B1|1992-01-13|1996-07-19|Darlet Marchante Tech Sa|CROSS-DRAWING DEVICE FOR THE MANUFACTURE OF BIORIENT FILMS.|
    JP3347836B2|1993-02-12|2002-11-20|積水化学工業株式会社|Foam sheet and method and apparatus for widening foam sheet|
    JP3985658B2|2002-11-08|2007-10-03|株式会社日立プラントテクノロジー|Sheet material drawing machine|
    DE102005021232A1|2005-05-09|2006-11-16|Güldenring, Alfons, Dipl.-Ing.|Heated plastic film movement and stretching method while feeding film thermoforming machine involves gripped movement through slower first and faster third zone and non-gripped movement in middle zone |
    JP2010046911A|2008-08-21|2010-03-04|Fujifilm Corp|Tentering machine and solution film-forming method using the same|
    CN202318924U|2011-11-25|2012-07-11|桂林电器科学研究院|Thin film clamping device of thin film draw forming or tension forming equipment|
    CN103223722A|2013-04-23|2013-07-31|苏州固泰新材料科技有限公司|Biaxial stretching device and track apparatus thereof|
    CN104708733A|2014-04-29|2015-06-17|赛的克恒丰精密电子材料（苏州）有限公司|Automatic chain track regulating system used for plastic-absorbing machine|FR3066138B1|2017-05-15|2019-07-12|Jean Pierre Darlet|DEVICE FOR STRETCHING THERMOPLASTIC FILM SIMULTANEOUSLY IN THE LONGITUDINAL AND TRANSVERSE DIRECTION|
    CN109732890A|2019-02-18|2019-05-10|山东永健机械有限公司|A kind of eight axis synchro-draw systems|
    CN111688074B|2020-06-12|2021-10-29|浙江远恒电子科技有限公司|Feeding control mechanism of lighting device plastic casing particle raw material suction machine|
    法律状态:
    2016-03-30| PLFP| Fee payment|Year of fee payment: 2 |
    2017-01-06| PLSC| Search report ready|Effective date: 20170106 |
    2017-06-07| PLFP| Fee payment|Year of fee payment: 3 |
    2017-08-04| TP| Transmission of property|Owner name: BRUCKNER MASCHINENBAU GMBH & CO. KG, DE Effective date: 20170630 |
    2018-06-25| PLFP| Fee payment|Year of fee payment: 4 |
    2019-06-25| PLFP| Fee payment|Year of fee payment: 5 |
    2021-03-12| ST| Notification of lapse|Effective date: 20210205 |
    优先权:
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    PCT/EP2016/057028| WO2017001068A1|2015-06-30|2016-03-31|Film-drawing machine and method for starting same|
    JP2017563164A| JP6466601B2|2015-06-30|2016-03-31|Thin film stretching equipment and its starting method|
    KR1020187002897A| KR20180026483A|2015-06-30|2016-03-31|Film stretcher and its starting method|
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