EP0878425A1 - Machine to wind film, process for the manufacturing of pre-stretched film rolls, and rolls of pre-stretched film manufactured by this process - Google Patents

Machine to wind film, process for the manufacturing of pre-stretched film rolls, and rolls of pre-stretched film manufactured by this process Download PDF

Info

Publication number
EP0878425A1
EP0878425A1 EP98401058A EP98401058A EP0878425A1 EP 0878425 A1 EP0878425 A1 EP 0878425A1 EP 98401058 A EP98401058 A EP 98401058A EP 98401058 A EP98401058 A EP 98401058A EP 0878425 A1 EP0878425 A1 EP 0878425A1
Authority
EP
European Patent Office
Prior art keywords
film
coil
reel
axis
receiving
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.)
Granted
Application number
EP98401058A
Other languages
German (de)
French (fr)
Other versions
EP0878425B1 (en
Inventor
Jean-Paul Martin-Cocher
Georges Jaconelli
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.)
Signode France SAS
Original Assignee
Thimon SAS
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 Thimon SAS filed Critical Thimon SAS
Publication of EP0878425A1 publication Critical patent/EP0878425A1/en
Application granted granted Critical
Publication of EP0878425B1 publication Critical patent/EP0878425B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H18/00—Winding webs
    • B65H18/28—Wound package of webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/40—Type of handling process
    • B65H2301/41—Winding, unwinding
    • B65H2301/414—Winding
    • B65H2301/4143—Performing winding process
    • B65H2301/41432—Performing winding process special features of winding process
    • B65H2301/414322—Performing winding process special features of winding process oscillated winding, i.e. oscillating the axis of the winding roller or material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/50—Auxiliary process performed during handling process
    • B65H2301/51—Modifying a characteristic of handled material
    • B65H2301/512—Changing form of handled material
    • B65H2301/5124—Stretching; Tentering

Definitions

  • the present invention relates mainly to a film winding machine, to a process for manufacturing reels of pre-stretched films and reels of pre-stretched films obtained by said process.
  • the prior stretching advantageously includes a step of unwinding of the film from a supply reel, a stretching step and, a step of winding the stretched film on a mandrel or a reel of receipt, pending further use.
  • the stretch film immediately undergoes a stretch relaxation which leads, during a period substantially equal to 48 hours, to a relaxation of the elastic restoring force substantially equal to 50%.
  • Pre-stretched films of known type are wound on cylindrical mandrels.
  • the film is unwound from the core to be wrapped, by example helically around a load to be overwrapped.
  • the pre-stretched stretch film wound on a chuck proved to be particularly fragile.
  • a fall on the ground risking by example of creating areas of least resistance or holes in the edge of the film.
  • Such areas of least resistance or such holes at the level of the edge of the film can form tear primers when overpacking of a load or, more seriously, during handling or the transport of the overpacked load with risk of dislocation of a such charge.
  • US-A-5,531,393 describes a machine for early drawing of a stretch film ensuring the texturing of the film to facilitate its unwinding. The edges of the film are folded. A horizontal reciprocating movement of the take-up reel distributes the resulting excess thickness.
  • GB-A-2 288 594 describes a device provided with means for winding the film on a reel with a horizontal axis driven by a reciprocating movement.
  • the main object of the invention is a machine for wind pre-stretched film from a supply reel to a reel for receiving pre-stretched films comprising drive means in rotation of the reel for receiving the pre-stretched films and / or the reel film supply, characterized in that it comprises means relative drive of said supply coil relative to said receiving coil so as to periodically vary the position of the edges of the film along the axis of the take-up reel, so that the edge of the wound film has a frustoconical or substantially conical profile.
  • the invention also relates to a machine, characterized in that the relative drive means of the supply coil by in relation to the receiving coil ensure a range of movement relative allowing the formation on said coil of reception of a profile frustoconical or substantially conical at the edge of the film forming with an axis of the receiving coil an angle ⁇ between 1 ° and 80 °.
  • the invention also relates to a machine, characterized in what the relative drive means of the supply coil by in relation to the receiving coil ensure a range of movement relative allowing the formation on said coil of reception of a profile frustoconical or substantially conical at the edge of the film forming with an axis of the receiving coil an angle ⁇ between 3 ° and 45 °.
  • the invention also relates to a machine, characterized in that the relative drive means of the supply coil by in relation to the receiving coil ensure a range of movement relative allowing the formation on said coil of reception of a profile frustoconical or substantially conical at the edge of the film forming with an axis of the receiving coil an angle ⁇ between 5 ° and 45 °.
  • the invention also relates to a machine, characterized in what it includes alternative drive means oscillating from the supply coil parallel to its axis and / or means alternating drive oscillating the receiving coil parallel to its axis.
  • the invention also relates to a machine, characterized in that the alternative drive means comprise an elliptical roller, eccentric oval or the like, rotated along an orthogonal axis to the axis of rotation of the supply coil and / or the reception; said roller driving said supply coil and / or reception parallel to said spindle rotation axis.
  • the alternative drive means comprise an elliptical roller, eccentric oval or the like, rotated along an orthogonal axis to the axis of rotation of the supply coil and / or the reception; said roller driving said supply coil and / or reception parallel to said spindle rotation axis.
  • the invention also relates to a machine, characterized in which it further comprises means for stretching a stretch film, film guiding means, film winding means stretched on the receiving coil.
  • the invention also relates to a machine, characterized in that it further comprises means for partially relaxing the mechanical tension in the film after stretching and before it is wound on the receiving coil.
  • the invention also relates to a method of winding pre-stretched films comprising a step of stretching a film and a step of winding of the stretched film on a take-up reel characterized in that, when of the winding, a relative movement of the supply means is ensured films and the take-up reel so as to periodically vary the position of the edges of the film along the axis of the take-up reel, so the edge of the wound film has a profile on the take-up reel frustoconical or substantially conical.
  • the invention also relates to a method, characterized in what the relative displacements of the film supply means by relation to the receiving coil is a displacement of a coil supply parallel to its axis and / or a receiving coil parallel to its axis.
  • the invention also relates to a method, characterized in that that the amplitude of the displacement is between 1% and 4%, preferably between 2% and 2.4%, the width of the width of the film.
  • the invention also relates to a method, characterized in what we do the winding with periodic variation of the position of edges of the film along the axis of the receiving reel, at the outlet of the means stretching of the film.
  • the invention also relates to a method, characterized in that that ensures the oscillating reciprocating movement of the supply coil parallel to its axis.
  • the subject of the invention is also a method, characterized in that an overwrapping film having been stretched under a tension between 10 and 20 N / mm 2 of initial width section is wound on the receiving reel. that the winding and the relaxation of the film on the take-up reel take place under a mechanical tension comprised between 10 and 90% of the stretching tension.
  • the subject of the invention is also a reel of pre-stretched film, characterized in that it was obtained by such a process.
  • the subject of the invention is also a film reel, characterized in that the ratio of mechanical tension in the wound film in the central part of the film reel with respect to the tension in the selvedges is between 1 and 5, preferably between 1 and 3, so more preferred between 1.5 and 2.5.
  • the invention also relates to a coil, characterized in that that the frustoconical or substantially conical profile forms with the axis of the coil an angle ⁇ between 1 ° and 80 °.
  • the invention also relates to a coil, characterized in that that the frustoconical or substantially conical profit forms with the axis (5) of the coil at an angle ⁇ between 3 ° and 45 °.
  • the invention also relates to a coil, characterized in that the frustoconical or substantially conical profile forms with the axis of the coil an angle ⁇ between 5 ° and 45 °.
  • FIGS. 1 to 11 the same references have been used for designate the same elements.
  • the tension in the film 2 at the edge 7 is significantly higher, for example equal to 1.4 N / cm, than that prevailing in the central part of the film 2 between the selvedges 7, for example equal to 0.7 N / cm for a film having a thickness of 20 to 23 ⁇ m and a width of width of 500 mm.
  • This localized overvoltage weakens the film while making it more difficult its progress.
  • the junction between the flank 9 and the edge 7 has a small surface which, in the event of a coil 1 falling and counts given the overvoltage prevailing in the edge 7, risk of generating zones lower resistance, micro-tears or micro-openings likely to form tear primers during processing of the film.
  • the reels 1 of known type are braked by application of the operator's fingers on the sides 9 of film 2 and / or on an internal surface 11 of mandrel 3.
  • Application fingers on the side 9 during the unwinding of the film that is to say at the level the edge of these films where it is most fragile because subjected to tension important mechanics, increases the chances of tearing of the film.
  • the edge 21 advantageously has a frustoconical profile or substantially conical, as illustrated in Figures 3 and 4, forming with the axis 5 of the mandrel 17 an angle ⁇ between 1 ° and 80 °, preferably between between 3 ° and 45 °, advantageously between 5 ° and 45 °, for example equal to 33 °, 40 ° or 45 °.
  • a reduction in the angle facilitates the unfolding of the film but reduces the amount of film that can be stored on a mandrel, in the measure where this angle, for a given oscillation determines the diameter external film as a function of the external diameter of the mandrel.
  • One more movie sticking taking place less easily requires a smaller angle ⁇ .
  • the tension in selvedge 21 is substantially equal to or less than that present in the central part of the movie.
  • the tension in the selvedge is for example between 0 and 1 N / cm, preferably between 0.1 and 0.8 N / cm, preferably between 0.2 and 0.7 N / cm, for example equal to 0.4 or 0.7 N / cm.
  • the edge 21 of the film 36 of the reel 38 according to the present invention is much less fragile than the edge 7 of the film 2 of the reel 1 of known type.
  • the radial superposition of the layers at the edge 21 does not hinder the unfolding of the film by causing the overlapping of the layers.
  • the mandrel 17 has a length greater than the width of the film width so that its projecting end of the film absorbs shock in the event of a vertical fall of the coil.
  • the absence or reduction of local excess thickness allows reduce the cost price by reducing the volume by one packaging containing a plurality of reels according to the present invention.
  • the film slides or rolls, without problem, on the film forming the next lower layer even with helical wrapping with significant amplitude displacement of the film reel 38 parallel to its axis 5 during successive turns of the propeller formed by the movie 36.
  • the machine 30 includes means 31 for receiving a coil 32 of stretch film, a pair of rollers 33, 34 of stretch film, a roll 35 ensuring the partial release of the tension in the film 36, means 37 for receiving a reel 38 of stretched and released film, rolls of reference 40, 41, 57 and 42 and at least one motor 43.
  • the roller 35 drives the receiving coil 38.
  • Transmission means movement 44 comprising chains, toothed belts, pinions and / or a gearbox allow the drive of the rollers 33, 34 and 35 by the motor 43.
  • the transmission means 44 have a chain or a belt 61 driven by the axis of the motor 43 and driving the axes of the rollers 34 and 42.
  • a second belt or chain 63 connects the axis of the roller 42 to the axis of the roller 35.
  • Means symbolized by the arrow 45 ensures the application of the roll 35 on the reel 38 of the stretched film be a coward.
  • the roller 35 departs from the axis of the coil 38 according to the arrow 46 as the diameter of the coil 38 increases as a result film winding on the reel.
  • the rollers 33, 34 and / or 35 are grooved, knurled and / or are provided with a surface having a good adhesion to the film.
  • cleaning takes place between the rollers 34 and 35 a film path having a length greater than 0.5 m, for example equal to 0.8 m, to allow elastic return transverse film 36 before winding, so as to release tensions transverse in the film generated by the longitudinal stretching tension.
  • 0.5 m for example equal to 0.8 m
  • the machine 30 of FIG. 6 comprises means 23 ensuring the displacement 25, advantageously periodic, of the coil 32 of the film 36 to be stretched and / or means 27 ensuring the displacement 29 of the reel 38 of the stretched film.
  • the displacement of the coil 32 and / or 38 ensures the preferably periodic axial displacement on the reel 38 of the selvedges of the film 36. It may for example be a tilting movement of the axis of the coil 32 or of the axis 5 of the coil 38.
  • it is a rectilinear translational movement of the axes of these coils.
  • a means 23 and / or 27 can include eccentrics, beautiful type mechanisms, crank or advantageously, as illustrated, an elliptical roller whose axes 51 and 52 of rotation 53 and 54 are perpendicular to the axes of coils 32 and 38, which decreases the time during which the coil 32 and / or 38 is at the extreme positions corresponding to the application on the roller 23 and / or 27 from the point of contact of the axes of the coils 32 and 38 at the level of the major axis and minor axis of the ellipse.
  • FIG. 9 one can see an example of embodiment of the drive means relating to the supply coil 32 relative to the receiving coil 38.
  • These drive means in Figure 9 comprise an advantageously electric motor 73, a reduction gear 74 provided an output axis 75 driving an elliptical, ovoid, eccentric or roller 23 similar.
  • the roller 23 is interchangeable with rollers of different size and / or shape, so that the amplitude can be adjusted and / or the frequency of the oscillations.
  • the lower end of axis 77 of rotation of the coil 32 advantageously equipped with a roller 76, wheel on the roller 23.
  • a guide ring 78 fixed on a support 79 provides guidance in translation 25 of the axis 77 and as a result of the coil 32.
  • the machine according to the present invention comprises advantageously means for synchronizing the rollers 23 and 27 with the means for driving the film 36 and / or the reels 38 and 32.
  • the rollers 23 and 27 can be oval or circular eccentric, that is to say with an axis of rotation 51, respectively 52, does not not passing through their center.
  • the amplitude of the oscillation is for example equal to 12 mm for a width having a width of 0.5 m with a corresponding frequency several turns of the coil 38, for example 5 or 6 for a speed of film progress of 300 meters per minute.
  • the frequency of the oscillations of the coils 32 and / or 38 can be between 3 and 20, preferably between 4 and 15 preferably, the unwinding speed being able to be between 50 and 1000 m / min, preferably between 300 and 500 m / min, the amplitude of the displacement can be between 5 and 20 mm, from preferably between 10 and 12 mm.
  • the axis 5 of the coil 38 is not not necessarily vertical.
  • the inclination of a coil of known type induces a risk of tearing the film.
  • the film 36 according to the invention rolls in such a case on the conical or frustoconical part of the selvedges 21 of the layers superimposed and wraps around an axis 82 parallel to the edge 21 of the film unrolled (see Figure 11).
  • the extra thickness thus created at the edge increases the tear resistance of the film.
  • the film 36 according to the invention has on its edge 21 a reduced tension, which further reduces the risk of tear.
  • the present invention is particularly applicable to film 36 which has been stretched under a tension between 10 and 20 N / mm 2 of initial width section, a winding and a relaxation on a mandrel under a mechanical tension between 10 and 90%. of the stretching tension.
  • the invention also applies to the winding of films under stretching tension as well as to the winding under an almost zero tension of stretched films.
  • machine according to the present invention can be directly fed by an extruder and not by a supply coil 32.
  • the present invention applies in particular to overpackaging using overwrapping machines.
  • the present invention mainly applies to overwrapping by manual unwinding.

Landscapes

  • Winding Of Webs (AREA)
  • Replacement Of Web Rolls (AREA)
  • Basic Packing Technique (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

This new machine winds pre-stretched film from a supply spool, onto a reception spool. Either or both are driven. A novel feature is relative axial movement of the spools, effecting periodic variation in the position of the film edges with respect to the axis (5) of the reception spool. The movement is such that the edge profile (21) of the spooled film, is caused to exhibit a frustrated- or near conical profile. Also claimed are: the corresponding method of spooling to produce the conical profile described; and the spool of film, formed by the winding process.

Description

La présente invention se rapporte principalement à une machine de bobinage de films, à un procédé de fabrication de bobines de films pré-étirés et aux bobines de films pré-étirés obtenues par ledit procédé.The present invention relates mainly to a film winding machine, to a process for manufacturing reels of pre-stretched films and reels of pre-stretched films obtained by said process.

L'étirage préalable comporte avantageusement une étape de déroulement du film à partir d'une bobine d'alimentation, une étape d'étirage et, une étape de bobinage du film étiré sur un mandrin ou une bobine de réception, dans l'attente de son utilisation ultérieure.The prior stretching advantageously includes a step of unwinding of the film from a supply reel, a stretching step and, a step of winding the stretched film on a mandrel or a reel of receipt, pending further use.

Le film étirable subit immédiatement après son étirage une relaxation qui conduit, lors d'une période sensiblement égale à 48 heures, à un relâchement de la force de rappel élastique sensiblement égal à 50 %.The stretch film immediately undergoes a stretch relaxation which leads, during a period substantially equal to 48 hours, to a relaxation of the elastic restoring force substantially equal to 50%.

La Demanderesse décrit dans la Demande de Brevet N° 92 10254 publiée sous le N° FR-A-2 695 102, un procédé de fabrication de films pré-étirés relaxés sous la tension d'étirage, et dans la Demande de Brevet Européenne N° 97 401 005.0 publiée sous le N° EP 0 806 284, un procédé de fabrication de films pré-étirés relaxés sous une tension mécanique faible.The Applicant described in the Patent Application No. 92 10254 published under No. FR-A-2 695 102, a process for manufacturing pre-stretched films relaxed under stretch tension, and in the Request for European Patent N ° 97 401 005.0 published under N ° EP 0 806 284, a process for making stretched pre-stretched films weak mechanics.

Les films pré-étirés de type connu sont enroulés sur des mandrins cylindriques. Le film est dévidé du mandrin pour être banderolé, par exemple hélicoïdalement autour d'une charge à suremballer.Pre-stretched films of known type are wound on cylindrical mandrels. The film is unwound from the core to be wrapped, by example helically around a load to be overwrapped.

Malheureusement, le film étirable pré-étiré bobiné sur un mandrin s'est révélé particulièrement fragile. Une chute sur le sol risquant par exemple d'engendrer des zones de moindre résistance ou des trous à la lisière du film. De tels zones de moindre résistance ou de tels trous au niveau de la lisière du film peuvent former des amorces de déchirure lors du suremballage d'une charge ou, ce qui est plus grave, lors de la manutention ou du transport de la charge suremballée avec risque de dislocation d'une telle charge.Unfortunately, the pre-stretched stretch film wound on a chuck proved to be particularly fragile. A fall on the ground risking by example of creating areas of least resistance or holes in the edge of the film. Such areas of least resistance or such holes at the level of the edge of the film can form tear primers when overpacking of a load or, more seriously, during handling or the transport of the overpacked load with risk of dislocation of a such charge.

De plus, les films dont l'épaisseur n'est pas parfaitement constante, bobinés sur un mandrin notamment en carton, engendrent au niveau des lisières du film des zones de recouvrement entre couches successives empêchant le bon déroulement du film lors du suremballage, pouvant conduire jusqu'à la déchirure du film. In addition, films whose thickness is not perfectly constant, wound on a mandrel, in particular in cardboard, generate level of film edges of overlap areas between layers successive preventing the smooth running of the film during overwrapping, can lead to tearing of the film.

US-A-5 531 393 décrit une machine d'étirage anticipé d'un film étirable assurant la texturation du film pour en faciliter le déroulement. Les lisières du film sont repliées. Un mouvement alternatif horizontal de la bobine de réception répartit la surépaisseur qui en résulte.US-A-5,531,393 describes a machine for early drawing of a stretch film ensuring the texturing of the film to facilitate its unwinding. The edges of the film are folded. A horizontal reciprocating movement of the take-up reel distributes the resulting excess thickness.

GB-A-2 288 594 décrit un dispositif muni de moyens d'enroulement du film sur une bobine d'axe horizontal entraínée par un mouvement alternatif.GB-A-2 288 594 describes a device provided with means for winding the film on a reel with a horizontal axis driven by a reciprocating movement.

Aucun de ces deux documents ne décrit ni ne suggère la formation de zones d'extrémités coniques ou sensiblement coniques facilitant le déroulement notamment manuel du film.Neither of these two documents describes or suggests the formation of conical or substantially conical end zones facilitating particularly the manual unfolding of the film.

C'est par conséquent un but de la présente invention d'offrir une bobine de films pré-étirés susceptibles d'être facilement déroulés de la bobine sans accrochage ni risque de déchirure.It is therefore an object of the present invention to offer a reel of pre-stretched films that can be easily unwound from the coil without catching or risk of tearing.

C'est également un but de la présente invention d'offrir une bobine de film étirable pré-étiré présentant une bonne résistance aux chocs.It is also an object of the present invention to provide a reel of pre-stretched stretch film with good impact resistance.

C'est aussi un but de la présente invention d'offrir une bobine de film pré-étiré ayant une forme régulière, sans surépaisseur locale, permettant de minimiser le volume de stockage de la bobine antérieurement à sa mise en oeuvre.It is also an object of the present invention to offer a coil of pre-stretched film having a regular shape, without local allowance, to minimize the storage volume of the coil prior to its implementation.

C'est également un but de la présente invention d'offrir une bobine de film étirable pré-étiré présentant une résistance importante au freinage, notamment lors de la dépose manuelle du film autour d'une charge.It is also an object of the present invention to provide a reel of pre-stretched stretch film with high resistance to braking, especially during manual removal of the film around a load.

Ces buts sont atteints par le procédé de bobinage de bobines de film étirable pré-étiré, selon la présente invention, assurant une oscillation du film ayant avantageusement une composante perpendiculaire à l'axe du film. On effectue, par exemple, lors du pré-étirage et du bobinage du film sur les mandrins de réception, une oscillation de la bobine d'alimentation, c'est-à-dire de la bobine sur laquelle est prélevé le film étirable à étirer et/ou du mandrin de réception. On assure ainsi un décalage des couches successives de films, notamment au niveau des lisières de la laize. Les bobines de films ainsi obtenues présentent un film sans surépaisseur et moins tendu au niveau des lisières de la laize que les films pré-étirés de type connu.These goals are achieved by the coil winding process of pre-stretched stretch film according to the present invention ensuring oscillation of the film advantageously having a component perpendicular to the axis of the movie. We carry out, for example, during the pre-stretching and the winding of the film on the receiving mandrels, an oscillation of the supply coil, that is to say from the reel from which the stretch film to be stretched is taken and / or from the receiving mandrel. This ensures an offset of the successive layers films, especially at the edges of the width. Film reels thus obtained have a film without excess thickness and less stretched at the level edges of the width as the pre-stretched films of known type.

L'invention a principalement pour objet une machine pour bobiner du film pré-étiré à partir d'une bobine d'alimentation vers une bobine de réception des films pré-étirés comportant des moyens d'entraínement en rotation de la bobine de réception des films pré-étirés et/ou de la bobine d'alimentation en films, caractérisée en ce qu'elle comporte des moyens d'entraínement relatifs de ladite bobine d'alimentation par rapport à ladite bobine de réception de manière à faire varier périodiquement la position des lisières du film selon l'axe de la bobine de réception, de manière à ce que la lisière du film bobiné présente un profil tronconique ou sensiblement conique.The main object of the invention is a machine for wind pre-stretched film from a supply reel to a reel for receiving pre-stretched films comprising drive means in rotation of the reel for receiving the pre-stretched films and / or the reel film supply, characterized in that it comprises means relative drive of said supply coil relative to said receiving coil so as to periodically vary the position of the edges of the film along the axis of the take-up reel, so that the the edge of the wound film has a frustoconical or substantially conical profile.

L'invention a également pour objet une machine, caractérisée en ce que les moyens d'entraínement relatif de la bobine d'alimentation par rapport à la bobine de réception assurent une amplitude de déplacement relatif permettant la formation sur ladite bobine de réception d'un profil tronconique ou sensiblement conique de la lisière du film formant avec un axe de la bobine de réception un angle α compris entre 1° et 80°.The invention also relates to a machine, characterized in that the relative drive means of the supply coil by in relation to the receiving coil ensure a range of movement relative allowing the formation on said coil of reception of a profile frustoconical or substantially conical at the edge of the film forming with an axis of the receiving coil an angle α between 1 ° and 80 °.

L'invention a aussi pour objet une machine, caractérisée en ce que les moyens d'entraínement relatif de la bobine d'alimentation par rapport à la bobine de réception assurent une amplitude de déplacement relatif permettant la formation sur ladite bobine de réception d'un profil tronconique ou sensiblement conique de la lisière du film formant avec un axe de la bobine de réception un angle α compris entre 3° et 45°.The invention also relates to a machine, characterized in what the relative drive means of the supply coil by in relation to the receiving coil ensure a range of movement relative allowing the formation on said coil of reception of a profile frustoconical or substantially conical at the edge of the film forming with an axis of the receiving coil an angle α between 3 ° and 45 °.

L'invention a également pour objet une machine, caractérisée en ce que les moyens d'entraínement relatif de la bobine d'alimentation par rapport à la bobine de réception assurent une amplitude de déplacement relatif permettant la formation sur ladite bobine de réception d'un profil tronconique ou sensiblement conique de la lisière du film formant avec un axe de la bobine de réception un angle α compris entre 5° et 45°.The invention also relates to a machine, characterized in that the relative drive means of the supply coil by in relation to the receiving coil ensure a range of movement relative allowing the formation on said coil of reception of a profile frustoconical or substantially conical at the edge of the film forming with an axis of the receiving coil an angle α between 5 ° and 45 °.

L'invention a aussi pour objet une machine, caractérisée en ce qu'elle comporte des moyens d'entraínement alternatifs oscillant de la bobine d'alimentation parallèlement à son axe et/ou des moyens d'entraínement alternatifs oscillant de la bobine de réception parallèlement à son axe.The invention also relates to a machine, characterized in what it includes alternative drive means oscillating from the supply coil parallel to its axis and / or means alternating drive oscillating the receiving coil parallel to its axis.

L'invention a également pour objet une machine, caractérisée en ce que les moyens d'entraínement alternatif comportent un galet elliptique, ovale excentrique ou analogue, entraíné en rotation selon un axe orthogonal à l'axe de rotation de la bobine d'alimentation et/ou de la bobine de réception ; ledit galet entraínant ladite bobine d'alimentation et/ou de réception parallèlement audit axe de rotation de bobine.The invention also relates to a machine, characterized in that the alternative drive means comprise an elliptical roller, eccentric oval or the like, rotated along an orthogonal axis to the axis of rotation of the supply coil and / or the reception; said roller driving said supply coil and / or reception parallel to said spindle rotation axis.

L'invention a aussi pour objet une machine, caractérisée en ce qu'elle comporte en outre des moyens d'étirage d'un film étirable, des moyens de guidage de films, des moyens de bobinage de films étirés sur la bobine de réception.The invention also relates to a machine, characterized in which it further comprises means for stretching a stretch film, film guiding means, film winding means stretched on the receiving coil.

L'invention a également pour objet une machine, caractérisée en ce qu'elle comporte en outre des moyens pour relâcher partiellement la tension mécanique dans le film après l'étirage et avant son bobinage sur la bobine de réception.The invention also relates to a machine, characterized in that it further comprises means for partially relaxing the mechanical tension in the film after stretching and before it is wound on the receiving coil.

L'invention a aussi pour objet un procédé de bobinage de films pré-étirés comportant une étape d'étirage d'un film et une étape de bobinage du film étiré sur une bobine de réception caractérisé en ce que, lors du bobinage, on assure un déplacement relatif des moyens d'alimentation en films et de la bobine de réception de manière à faire varier périodiquement la position des lisières du film selon l'axe de la bobine de réception, de manière à ce que la lisière du film bobiné présente sur la bobine de réception un profil tronconique ou sensiblement conique.The invention also relates to a method of winding pre-stretched films comprising a step of stretching a film and a step of winding of the stretched film on a take-up reel characterized in that, when of the winding, a relative movement of the supply means is ensured films and the take-up reel so as to periodically vary the position of the edges of the film along the axis of the take-up reel, so the edge of the wound film has a profile on the take-up reel frustoconical or substantially conical.

L'invention a également pour objet un procédé, caractérisé en ce que les déplacements relatifs des moyens d'alimentation en films par rapport à la bobine de réception est un déplacement d'une bobine d'alimentation parallèlement à son axe et/ou d'une bobine de réception parallèlement à son axe.The invention also relates to a method, characterized in what the relative displacements of the film supply means by relation to the receiving coil is a displacement of a coil supply parallel to its axis and / or a receiving coil parallel to its axis.

L'invention a aussi pour objet un procédé, caractérisé en ce que l'amplitude du déplacement est comprise entre 1 % et 4 %, de préférence entre 2 % et 2,4 %, de la largeur de la laize du film.The invention also relates to a method, characterized in that that the amplitude of the displacement is between 1% and 4%, preferably between 2% and 2.4%, the width of the width of the film.

L'invention a également pour objet un procédé, caractérisé en ce qu'on effectue le bobinage avec variation périodique de la position des lisières du film selon l'axe de la bobine de réception, en sortie des moyens d'étirage du film.The invention also relates to a method, characterized in what we do the winding with periodic variation of the position of edges of the film along the axis of the receiving reel, at the outlet of the means stretching of the film.

L'invention a aussi pour objet un procédé, caractérisé en ce qu'on assure le déplacement alternatif oscillant de la bobine d'alimentation parallèlement à son axe.The invention also relates to a method, characterized in that that ensures the oscillating reciprocating movement of the supply coil parallel to its axis.

L'invention a également pour objet un procédé, caractérisé en ce qu'on bobine sur la bobine de réception un film de suremballage ayant subi un étirage sous une tension comprise entre 10 et 20 N/mm2 de section initiale de laize, et en ce que le bobinage et la relaxation du film sur la bobine de réception s'effectuent sous une tension mécanique comprise entre 10 et 90 % de la tension d'étirage. The subject of the invention is also a method, characterized in that an overwrapping film having been stretched under a tension between 10 and 20 N / mm 2 of initial width section is wound on the receiving reel. that the winding and the relaxation of the film on the take-up reel take place under a mechanical tension comprised between 10 and 90% of the stretching tension.

L'invention a aussi pour objet une bobine de film pré-étiré, caractérisée en ce qu'elle a été obtenue par un tel procédé.The subject of the invention is also a reel of pre-stretched film, characterized in that it was obtained by such a process.

L'invention a également pour objet une bobine de film, caractérisée en ce que le rapport de la tension mécanique dans le film bobiné dans la partie centrale de la bobine du film par rapport à la tension dans les lisières est compris entre 1 et 5, de préférence entre 1 et 3, de manière encore préférée entre 1,5 et 2,5.The subject of the invention is also a film reel, characterized in that the ratio of mechanical tension in the wound film in the central part of the film reel with respect to the tension in the selvedges is between 1 and 5, preferably between 1 and 3, so more preferred between 1.5 and 2.5.

L'invention a aussi pour objet une bobine, caractérisée en ce que le profil tronconique ou sensiblement conique forme avec l'axe de la bobine un angle α compris entre 1° et 80°.The invention also relates to a coil, characterized in that that the frustoconical or substantially conical profile forms with the axis of the coil an angle α between 1 ° and 80 °.

L'invention a aussi pour objet une bobine, caractérisée en ce que le profit tronconique ou sensiblement conique forme avec l'axe (5) de la bobine un angle α compris entre 3° et 45°.The invention also relates to a coil, characterized in that that the frustoconical or substantially conical profit forms with the axis (5) of the coil at an angle α between 3 ° and 45 °.

L'invention a également pour objet une bobine, caractérisée en ce que le profil tronconique ou sensiblement conique forme avec l'axe de la bobine un angle α compris entre 5° et 45°.The invention also relates to a coil, characterized in that the frustoconical or substantially conical profile forms with the axis of the coil an angle α between 5 ° and 45 °.

L'invention sera mieux comprise au moyen de la description ci-après et des figures annexées données comme des exemples non limitatifs et sur lesquels :

  • la figure 1 est une vue en perspective d'une extrémité d'une bobine de film pré-étiré de type connu ;
  • la figure 2 est une vue en coupe axiale de l'extrémité de la bobine de la figure 1 ;
  • la figure 3 est une vue en perspective d'une extrémité d'une bobine de film pré-étiré, bobinée par le procédé selon la présente invention ;
  • la figure 4 est une vue en coupe axiale de l'extrémité de la bobine de la figure 3 ;
  • la figure 5 est une vue en plan d'une machine de fabrication d'une bobine de film selon la présente invention ;
  • la figure 6 est une vue de côté de certains éléments de la machine de la figures 5 ;
  • la figure 7 est une vue en coupe d'un détail à plus grande échelle d'une zone de la figure 1 ;
  • la figure 8 est une vue en coupe, à plus grande échelle, d'un autre détail de la figure 1 ;
  • la figure 9 est une vue en perspective d'un détail de la machine de la figure 5 ;
  • la figure 10 est une vue en perspective d'une extrémité d'une bobine de la figure 3 lors du banderolage manuel autour d'une charge ;
  • la figure 11 illustre, à plus grande échelle, la lisière du film de la figure 10.
The invention will be better understood by means of the description below and the appended figures given as nonlimiting examples and in which:
  • Figure 1 is a perspective view of one end of a reel of pre-stretched film of known type;
  • Figure 2 is an axial sectional view of the end of the coil of Figure 1;
  • Figure 3 is a perspective view of one end of a reel of pre-stretched film, wound by the method according to the present invention;
  • Figure 4 is an axial sectional view of the end of the coil of Figure 3;
  • FIG. 5 is a plan view of a machine for manufacturing a film reel according to the present invention;
  • Figure 6 is a side view of some elements of the machine of Figures 5;
  • Figure 7 is a sectional view of a detail on a larger scale of an area of Figure 1;
  • Figure 8 is a sectional view, on a larger scale, of another detail of Figure 1;
  • Figure 9 is a perspective view of a detail of the machine of Figure 5;
  • Figure 10 is a perspective view of one end of a coil of Figure 3 during manual wrapping around a load;
  • FIG. 11 illustrates, on a larger scale, the edge of the film of FIG. 10.

Sur les figures 1 à 11, on a utilisé les mêmes références pour désigner les mêmes éléments.In FIGS. 1 to 11, the same references have been used for designate the same elements.

Sur les figures 1 et 2, on peut voir l'extrémité d'une bobine 1 de film 2 pré-étiré enroulé sur un mandrin cylindrique 3 d'axe 5. La lisière 7 du film de la bobine 1 présente une surépaisseur tronconique, sensiblement tronconique ou sensiblement conique, s'évasant vers l'extérieur de la bobine et se terminant par un flanc 9 sensiblement perpendiculaire à l'axe 5.In Figures 1 and 2, we can see the end of a coil 1 of pre-stretched film 2 wound on a cylindrical mandrel 3 of axis 5. The selvedge 7 of the film of the reel 1 has a frustoconical allowance, substantially frustoconical or substantially conical, widening towards the outside of the coil and ending with a flank 9 substantially perpendicular to the axis 5.

Même pour un film d'épaisseur parfaitement uniforme, la bobine des figures 1 et 2 présente de nombreux inconvénients. Un creux 7' délimité par les deux surépaisseurs des lisières 7 axialement opposées forme un espace perdu augmentant le volume occupé par un ensemble de bobines disposées dans leur conditionnement.Even for a film of perfectly uniform thickness, the coil of Figures 1 and 2 has many disadvantages. A hollow 7 ' delimited by the two extra thicknesses of the axially opposite edges 7 form a lost space increasing the volume occupied by a set of coils arranged in their packaging.

La tension dans le film 2 au niveau de la lisière 7 est nettement supérieure, par exemple égale à 1,4 N/cm, à celle régnant dans la partie centrale du film 2 entre les lisières 7, par exemple égale à 0,7 N/cm pour un film ayant une épaisseur de 20 à 23 µm et une largeur de laize de 500 mm. Cette surtension localisée fragilise le film tout en rendant plus difficile son déroulement. De plus, la jonction entre le flanc 9 et la lisière 7 présente une faible surface qui, en cas de chute d'une bobine 1 et compte tenu de la surtension régnant dans la lisière 7, risque d'engendrer des zones de plus faible résistance, des micro-déchirures ou micro-ouvertures susceptibles de former des amorces de déchirures lors de la mise en oeuvre du film.The tension in the film 2 at the edge 7 is significantly higher, for example equal to 1.4 N / cm, than that prevailing in the central part of the film 2 between the selvedges 7, for example equal to 0.7 N / cm for a film having a thickness of 20 to 23 µm and a width of width of 500 mm. This localized overvoltage weakens the film while making it more difficult its progress. In addition, the junction between the flank 9 and the edge 7 has a small surface which, in the event of a coil 1 falling and counts given the overvoltage prevailing in the edge 7, risk of generating zones lower resistance, micro-tears or micro-openings likely to form tear primers during processing of the film.

Dans le cas de dépose manuelle du film 2, les bobines 1 de type connu sont freinées par application des doigts de l'opérateur sur les flancs 9 du film 2 et/ou sur une surface interne 11 du mandrin 3. L'application des doigts sur le flanc 9 lors du déroulement du film 2, c'est-à-dire au niveau de la lisière de ces films où il est le plus fragile car soumis à une tension mécanique importante, augmente les chances de déchirure du film. In the case of manual removal of the film 2, the reels 1 of known type are braked by application of the operator's fingers on the sides 9 of film 2 and / or on an internal surface 11 of mandrel 3. Application fingers on the side 9 during the unwinding of the film 2, that is to say at the level the edge of these films where it is most fragile because subjected to tension important mechanics, increases the chances of tearing of the film.

Malheureusement, il est extrêmement difficile d'extruder un film d'épaisseur constante. Ainsi, il est fréquent d'avoir des superpositions 13 de plusieurs dizaines de couches de film plus fin suivies par plusieurs dizaines de couches de film plus épais et/ou inversement. Au moment du préétirage avant bobinage l'étirage des zones plus fines du film conduit à des réductions de laize (neck down en terminologie anglo-saxonne) plus importantes. Il est fréquent dans un tel cas d'obtenir des couches supérieures qui, au niveau de la lisière 7, sont partiellement recouvertes par les couches inférieures empêchant le bon déroulement du film et susceptibles également d'engendrer des déchirures lors du déroulement.Unfortunately, it is extremely difficult to extrude a film of constant thickness. So it is common to have overlays 13 several dozen layers of finer film followed by several tens of layers of thicker film and / or vice versa. At the time of pre-stretching before winding stretching the thinner areas of the film leads to width reductions (neck down in English terminology) more important. It is common in such a case to obtain upper layers which, at the edge 7, are partially covered by the layers lower preventing the smooth running of the film and also likely cause tears during the course.

Sur les figures 7 et 8, on peut voir, en 71, deux exemples des lisières des couches successives de film ayant une épaisseur plus importante. Lors de l'étirage, ces couches d'épaisseur plus importante vont avoir une largeur de laize plus grande et par suite, comme illustré sur les figures 7 et 8, vont se recourber et chevaucher les laizes du film des couches voisines. Il en résulte, lors du déroulement du film, notamment dans les directions indiquées par les flèches 72, un risque de rupture en lisière du film 2.In Figures 7 and 8, we can see, in 71, two examples of edges of successive layers of film having a greater thickness. During stretching, these layers of greater thickness will have a wider width and consequently, as illustrated in FIGS. 7 and 8, will curl and overlap the widths of the film in the neighboring layers. It results, during the course of the film, in particular in the directions indicated by arrows 72, a risk of rupture at the edge of the film 2.

Sur les figures 3 et 4, on peut voir une bobine 38 selon la présente invention qui a été bobinée, avantageusement lors du pré-étirage, avec déplacement, avantageusement périodique, du film 36, parallèlement à l'axe 5 du mandrin 17, de manière à assurer le déplacement axial des lisières du film 36 et éviter la superposition de lisières des couches successives du film 36. Il en résulte une diminution ou une suppression de la surépaisseur au niveau de la lisière. Au contraire, après un rebord arrondi 19 la lisière 21 du film se rapproche de l'axe 5 au fur à mesure que l'on se dirige vers l'extrémité de la bobine. La lisière 21 a avantageusement un profil tronconique ou sensiblement conique, comme illustré sur les figures 3 et 4, formant avec l'axe 5 du mandrin 17 un angle α compris entre 1° et 80°, de préférence compris entre 3° et 45°, avantageusement compris entre 5° et 45°, par exemple égal à 33°, 40° ou 45°. Une diminution de l'angle facilite le déroulement du film mais diminue la quantité de film susceptible d'être stockée sur un mandrin, dans la mesure où cet angle, pour une oscillation donnée détermine le diamètre externe du film en fonction du diamètre externe du mandrin. Un film plus collant se déroulant moins facilement nécessite un angle α moins important.In Figures 3 and 4, we can see a coil 38 according to the present invention which has been wound, advantageously during pre-stretching, with displacement, advantageously periodic, of the film 36, parallel to the axis 5 of the mandrel 17, so as to ensure the axial displacement of the selvedges of the film 36 and avoid overlapping the edges of the successive layers of the film 36. This results in a reduction or elimination of the excess thickness at the edge level. On the contrary, after a rounded edge 19 the edge 21 of the film approaches axis 5 as we move towards the end of the coil. The edge 21 advantageously has a frustoconical profile or substantially conical, as illustrated in Figures 3 and 4, forming with the axis 5 of the mandrel 17 an angle α between 1 ° and 80 °, preferably between between 3 ° and 45 °, advantageously between 5 ° and 45 °, for example equal to 33 °, 40 ° or 45 °. A reduction in the angle facilitates the unfolding of the film but reduces the amount of film that can be stored on a mandrel, in the measure where this angle, for a given oscillation determines the diameter external film as a function of the external diameter of the mandrel. One more movie sticking taking place less easily requires a smaller angle α.

La bobine 38 selon la présente invention présente de nombreux avantages. Tout d'abord, la tension dans la lisière 21 est sensiblement égale ou inférieure à celle présente dans la partie centrale du film. Pour un film de 20 à 23 µm d'épaisseur et de 500 mm de largeur de laize, la tension dans la lisière est par exemple comprise entre 0 et 1 N/cm, de préférence comprise entre 0,1 et 0,8 N/cm, de manière préférentielle comprise entre 0,2 et 0,7 N/cm, par exemple égale à 0,4 ou 0,7 N/cm.The coil 38 according to the present invention has many advantages. First of all, the tension in selvedge 21 is substantially equal to or less than that present in the central part of the movie. For a film 20 to 23 µm thick and 500 mm wide width, the tension in the selvedge is for example between 0 and 1 N / cm, preferably between 0.1 and 0.8 N / cm, preferably between 0.2 and 0.7 N / cm, for example equal to 0.4 or 0.7 N / cm.

Ainsi, la lisière 21 du film 36 de la bobine 38 selon la présente invention est bien moins fragile que la lisière 7 du film 2 de la bobine 1 de type connu. La superposition radiale des couches au niveau de la lisère 21 ne gêne pas le déroulement du film en engendrant le chevauchement des couches.Thus, the edge 21 of the film 36 of the reel 38 according to the present invention is much less fragile than the edge 7 of the film 2 of the reel 1 of known type. The radial superposition of the layers at the edge 21 does not hinder the unfolding of the film by causing the overlapping of the layers.

Une meilleure résistance aux chutes est obtenue non seulement par une tension inférieure dans la lisière 21, mais également par le rebord arrondi 19. De plus, les couches superficielles vont au delà du rebord 19 sur la lisière 21. Ainsi, une éventuelle ouverture ou micro-déchirure au niveau du rebord 19 fragilise moins les films qu'une même micro-déchirure ou qu'une ouverture qui serait présente sur la lisière du film et a par conséquent moins tendance à former une amorce de déchirure du film 36. Avantageusement, le mandrin 17 a une longueur supérieure à la largeur de la laize de film de manière à ce que son extrémité dépassant du film amortisse le choc dans le cas d'une chute verticale de la bobine.Better resistance to falls is obtained not only by a lower tension in the edge 21, but also by the rounded rim 19. In addition, the surface layers go beyond the rim 19 on the edge 21. Thus, a possible opening or micro-tearing at the level of the rim 19 weakens the films less than the same micro-tear or that an opening which would be present on the edge of the film and therefore has less likely to form a film tear primer 36. Advantageously, the mandrel 17 has a length greater than the width of the film width so that its projecting end of the film absorbs shock in the event of a vertical fall of the coil.

L'absence ou la diminution des surépaisseurs locales permet de réduire le prix de revient par une diminution du volume d'un conditionnement contenant une pluralité de bobines selon la présente invention.The absence or reduction of local excess thickness allows reduce the cost price by reducing the volume by one packaging containing a plurality of reels according to the present invention.

Lors du déroulement du film 36 de la bobine 38 selon la présente invention, le film glisse ou roule, sans problème, sur le film formant la couche immédiatement inférieure même lors de banderolages hélicoïdaux avec déplacement d'amplitude importante de la bobine 38 du film parallèlement à son axe 5 lors des tours successifs de l'hélice formés par le film 36.During the unwinding of the film 36 of the reel 38 according to the present invention, the film slides or rolls, without problem, on the film forming the next lower layer even with helical wrapping with significant amplitude displacement of the film reel 38 parallel to its axis 5 during successive turns of the propeller formed by the movie 36.

Exemples préférés de réalisation de bobines de films selon l'invention : Preferred examples of film reels according to the invention:

Exemple 1 : Example 1 :

Film moyennement collant :

  • diamètre extérieur : 105 mm
  • diamètre mandrin : 68 mm
  • amplitude de déplacement lisière : 20 mm
  • α = 42°.
Moderately sticky film:
  • outer diameter: 105 mm
  • mandrel diameter: 68 mm
  • edge displacement range: 20 mm
  • α = 42 °.

Exemple 2 : Example 2 :

Film peu collant :

  • diamètre extérieur : 150 mm
  • diamètre mandrin : 68 mm
  • amplitude de déplacement lisière : 15 mm
  • α = 70°.
Slightly sticky film:
  • outer diameter: 150 mm
  • mandrel diameter: 68 mm
  • edge displacement range: 15 mm
  • α = 70 °.

Exemple 3 : Example 3 :

Film très collant :

  • diamètre extérieur : 95 mm
  • diamètre mandrin : 68 mm
  • amplitude de déplacement lisière : 20 mm
  • α = 32°.
Very sticky film:
  • outer diameter: 95 mm
  • mandrel diameter: 68 mm
  • edge displacement range: 20 mm
  • α = 32 °.

Sur la figure 5, on peut voir un exemple de réalisation d'une machine 30 d'étirage préalable avec relaxation de film selon la présente invention. La machine 30 comporte des moyens 31 de réception d'une bobine 32 de film à étirer, une paire de rouleaux 33, 34 d'étirage de film, un rouleau 35 assurant le relâchement partiel de la tension dans le film 36, des moyens 37 de réception d'une bobine 38 de film étiré et relâché, des rouleaux de renvoi 40, 41, 57 et 42 et au moins un moteur 43. Avantageusement, le rouleau 35 entraíne la bobine de réception 38. Des moyens de transmission de mouvement 44 comportant des chaínes, des courroies crantées, des pignons et/ou une boíte de vitesse permettent l'entraínement des rouleaux 33, 34 et 35 par le moteur 43. Par exemple, les moyens de transmission 44 comportent une chaíne ou une courroie 61 entraínée par l'axe du moteur 43 et entraínant les axes des rouleaux 34 et 42. Une seconde courroie ou chaíne 63 relie l'axe du rouleau 42 à l'axe du rouleau 35. Des moyens symbolisés par la flèche 45 assurent l'application du rouleau 35 sur la bobine 38 du film étiré et relâché. Le rouleau 35 s'écarte de l'axe de la bobine 38 selon la flèche 46 au fur et à mesure que le diamètre de la bobine 38 augmente par suite d'enroulement du film sur la bobine. Avantageusement, les rouleaux 33, 34 et/ou 35 sont rainurés, moletés et/ou sont munis d'une surface présentant une bonne adhérence au film. Avantageusement, on ménage entre les rouleaux 34 et 35 un trajet de film ayant une longueur supérieure à 0,5 m, par exemple égale à 0,8 m, pour permettre le retour élastique transversal du film 36 avant bobinage, de manière à libérer les tensions transversales dans le film engendrées par la tension d'étirage longitudinal. On facilite ainsi le bobinage du film sur la bobine 38 et son débobinage ultérieur.In Figure 5, we can see an example of an embodiment of a machine 30 for prior stretching with film relaxation according to the present invention. The machine 30 includes means 31 for receiving a coil 32 of stretch film, a pair of rollers 33, 34 of stretch film, a roll 35 ensuring the partial release of the tension in the film 36, means 37 for receiving a reel 38 of stretched and released film, rolls of reference 40, 41, 57 and 42 and at least one motor 43. Advantageously, the roller 35 drives the receiving coil 38. Transmission means movement 44 comprising chains, toothed belts, pinions and / or a gearbox allow the drive of the rollers 33, 34 and 35 by the motor 43. For example, the transmission means 44 have a chain or a belt 61 driven by the axis of the motor 43 and driving the axes of the rollers 34 and 42. A second belt or chain 63 connects the axis of the roller 42 to the axis of the roller 35. Means symbolized by the arrow 45 ensures the application of the roll 35 on the reel 38 of the stretched film be a coward. The roller 35 departs from the axis of the coil 38 according to the arrow 46 as the diameter of the coil 38 increases as a result film winding on the reel. Advantageously, the rollers 33, 34 and / or 35 are grooved, knurled and / or are provided with a surface having a good adhesion to the film. Advantageously, cleaning takes place between the rollers 34 and 35 a film path having a length greater than 0.5 m, for example equal to 0.8 m, to allow elastic return transverse film 36 before winding, so as to release tensions transverse in the film generated by the longitudinal stretching tension. We Thus facilitates the winding of the film on the reel 38 and its subsequent unwinding.

La machine 30 de la figure 6 comporte des moyens 23 assurant le déplacement 25, avantageusement périodique, de la bobine 32 du film 36 à étirer et/ou des moyens 27 assurant le déplacement 29 de la bobine 38 du film étiré. Le déplacement de la bobine 32 et/ou 38 assure le déplacement axial de préférence périodique sur la bobine 38 des lisières du film 36. Il peut par exemple s'agir d'un mouvement de basculement de l'axe de la bobine 32 ou de l'axe 5 de la bobine 38. Avantageusement, il s'agit d'un mouvement de translation rectiligne des axes de ces bobines. Un moyen 23 et/ou 27 peuvent comporter des excentriques, mécanismes de type belle, manivelle ou avantageusement, comme illustré, un galet elliptique dont les axes 51 et 52 de rotation 53 et 54 sont perpendiculaires aux axes des bobines 32 et 38, ce qui diminue le temps durant lequel la bobine 32 et/ou 38 se trouve aux positions extrêmes correspondant à l'application sur le galet 23 et/ou 27 du point de contact des axes des bobines 32 et 38 au niveau du grand axe et du petit axe de l'ellipse.The machine 30 of FIG. 6 comprises means 23 ensuring the displacement 25, advantageously periodic, of the coil 32 of the film 36 to be stretched and / or means 27 ensuring the displacement 29 of the reel 38 of the stretched film. The displacement of the coil 32 and / or 38 ensures the preferably periodic axial displacement on the reel 38 of the selvedges of the film 36. It may for example be a tilting movement of the axis of the coil 32 or of the axis 5 of the coil 38. Advantageously, it is a rectilinear translational movement of the axes of these coils. A means 23 and / or 27 can include eccentrics, beautiful type mechanisms, crank or advantageously, as illustrated, an elliptical roller whose axes 51 and 52 of rotation 53 and 54 are perpendicular to the axes of coils 32 and 38, which decreases the time during which the coil 32 and / or 38 is at the extreme positions corresponding to the application on the roller 23 and / or 27 from the point of contact of the axes of the coils 32 and 38 at the level of the major axis and minor axis of the ellipse.

Sur la figure 9, on peut voir un exemple de réalisation des moyens d'entraínement relatifs à la bobine d'alimentation 32 par rapport à la bobine de réception 38. Ces moyens d'entraínement sur la figure 9 comportent un moteur 73 avantageusement électrique, un réducteur 74 muni d'un axe de sortie 75 entraínant un galet 23 elliptique, ovoïde, excentrique ou analogue. Avantageusement, le galet 23 est interchangeable avec des galets de taille et/ou de forme différentes, de manière à pouvoir ajuster l'amplitude et/ou la fréquence des oscillations. L'extrémité inférieure de l'axe 77 de rotation de la bobine 32, avantageusement équipé d'un galet 76, roue sur le galet 23. Une bague de guidage 78 fixée sur un support 79 assure le guidage en translation 25 de l'axe 77 et par suite de la bobine 32.In FIG. 9, one can see an example of embodiment of the drive means relating to the supply coil 32 relative to the receiving coil 38. These drive means in Figure 9 comprise an advantageously electric motor 73, a reduction gear 74 provided an output axis 75 driving an elliptical, ovoid, eccentric or roller 23 similar. Advantageously, the roller 23 is interchangeable with rollers of different size and / or shape, so that the amplitude can be adjusted and / or the frequency of the oscillations. The lower end of axis 77 of rotation of the coil 32, advantageously equipped with a roller 76, wheel on the roller 23. A guide ring 78 fixed on a support 79 provides guidance in translation 25 of the axis 77 and as a result of the coil 32.

La machine selon la présente invention comporte avantageusement des moyens de synchronisation des galets 23 et 27 avec les moyens d'entraínement du film 36 et/ou des bobines 38 et 32. The machine according to the present invention comprises advantageously means for synchronizing the rollers 23 and 27 with the means for driving the film 36 and / or the reels 38 and 32.

Les galets 23 et 27 peuvent être de forme ovale ou circulaire excentrique, c'est-à-dire avec un axe de rotation 51, respectivement 52, ne passant pas par leur centre.The rollers 23 and 27 can be oval or circular eccentric, that is to say with an axis of rotation 51, respectively 52, does not not passing through their center.

L'amplitude de l'oscillation est par exemple égale à 12 mm pour une laize ayant une largeur de 0,5 m avec une fréquence correspondant à plusieurs tours de la bobine 38, par exemple 5 ou 6 pour une vitesse de déroulement du film de 300 mètres par minute. Toutefois, il est bien entendu que ces valeurs ne sont pas limitatives, la fréquence des oscillations des bobines 32 et/ou 38 pouvant être comprises entre 3 et 20, de préférence entre 4 et 15 de manière préférentielle, la vitesse de déroulement pouvant être comprise entre 50 et 1000 m/mn, de préférence entre 300 et 500 m/mn, l'amplitude du déplacement pouvant être comprise entre 5 et 20 mm, de préférence entre 10 et 12 mm.The amplitude of the oscillation is for example equal to 12 mm for a width having a width of 0.5 m with a corresponding frequency several turns of the coil 38, for example 5 or 6 for a speed of film progress of 300 meters per minute. However, it is understood that these values are not limiting, the frequency of the oscillations of the coils 32 and / or 38 can be between 3 and 20, preferably between 4 and 15 preferably, the unwinding speed being able to be between 50 and 1000 m / min, preferably between 300 and 500 m / min, the amplitude of the displacement can be between 5 and 20 mm, from preferably between 10 and 12 mm.

Lors du banderolage manuel d'un film 36 autour d'une charge 80 selon la flèche 81, illustrée sur la figure 10, l'axe 5 de la bobine 38 n'est pas nécessairement vertical. L'inclinaison d'une bobine de type connu induit un risque de déchirure du film. Le film 36 selon l'invention roule dans un tel cas sur la partie conique ou tronconique des lisières 21 des couches superposées et s'enroule autour d'un axe 82 parallèle à la lisière 21 du film déroulé (voir figure 11). La surépaisseur ainsi créée en lisière augmente la résistance à la déchirure du film. De plus, le film 36 selon l'invention présente sur sa lisière 21 une tension réduite, ce qui diminue encore les risques de déchirure.When manually wrapping a 36 film around a load 80 according to arrow 81, illustrated in FIG. 10, the axis 5 of the coil 38 is not not necessarily vertical. The inclination of a coil of known type induces a risk of tearing the film. The film 36 according to the invention rolls in such a case on the conical or frustoconical part of the selvedges 21 of the layers superimposed and wraps around an axis 82 parallel to the edge 21 of the film unrolled (see Figure 11). The extra thickness thus created at the edge increases the tear resistance of the film. In addition, the film 36 according to the invention has on its edge 21 a reduced tension, which further reduces the risk of tear.

La présente invention s'applique particulièrement au film 36 ayant subi un étirage sous une tension comprise entre 10 et 20 N/mm2 de section initiale de laize, un bobinage et une relaxation sur un mandrin sous une tension mécanique comprise entre 10 et 90 % de la tension d'étirage. Toutefois, l'invention s'applique également au bobinage des films sous tension d'étirage ainsi qu'au bobinage sous une tension quasi nulle des films étirés.The present invention is particularly applicable to film 36 which has been stretched under a tension between 10 and 20 N / mm 2 of initial width section, a winding and a relaxation on a mandrel under a mechanical tension between 10 and 90%. of the stretching tension. However, the invention also applies to the winding of films under stretching tension as well as to the winding under an almost zero tension of stretched films.

Bien qu'il soit avantageux d'assurer l'oscillation et/ou translation de la bobine 32 et/ou 38 lors de l'opération d'étirage du film, un procédé comprenant une étape antérieure d'étirage et une étape postérieure de rembobinage avec oscillation et/ou translation des bobines d'alimentation et/ou de réception ne sort pas du cadre de la présente invention. Although it is advantageous to ensure the oscillation and / or translation of the reel 32 and / or 38 during the film stretching operation, a process comprising an anterior stretching step and a posterior step rewinding with oscillation and / or translation of the feed coils and / or reception is not beyond the scope of the present invention.

Il est bien entendu que la machine selon la présente invention peut être directement alimentée par une extrudeuse et non pas par une bobine d'alimentation 32.It is understood that the machine according to the present invention can be directly fed by an extruder and not by a supply coil 32.

La présente invention s'applique notamment au suremballage mettant en oeuvre des machines de suremballage.The present invention applies in particular to overpackaging using overwrapping machines.

La présente invention s'applique principalement au suremballage par un déroulage manuel.The present invention mainly applies to overwrapping by manual unwinding.

Claims (19)

Machine pour bobiner du film pré-étiré à partir d'une bobine d'alimentation (32) vers une bobine de réception des films pré-étirés comportant des moyens d'entraínement en rotation de la bobine (38) de réception des films pré-étirés et/ou de la bobine d'alimentation en films (32), caractérisée en ce qu'elle comporte des moyens d'entraínement relatifs de ladite bobine d'alimentation (32) par rapport à ladite bobine de réception (38) de manière à faire varier périodiquement la position des lisières du film (36) selon l'axe (5) de la bobine de réception (38), de manière à ce que la lisière (21) du film (36) bobiné présente un profil tronconique ou sensiblement conique.Machine for winding pre-stretched film from a reel supply (32) to a reel for receiving the pre-stretched films comprising means for driving the coil (38) in rotation receiving the pre-stretched films and / or the film supply reel (32), characterized in that it comprises relative drive means of said supply coil (32) relative to said receive coil (38) so as to periodically vary the position of the edges of the film (36) along the axis (5) of the receiving coil (38), so that the selvedge (21) of the wound film (36) has a frustoconical profile or substantially conical. Machine selon la revendication 1, caractérisée en ce que les moyens d'entraínement relatif de la bobine d'alimentation (32) par rapport à la bobine de réception (38) assurent une amplitude de déplacement relatif permettant la formation sur ladite bobine de réception d'un profil tronconique ou sensiblement conique de la lisière (21) du film formant avec un axe (5) de la bobine de réception un angle α compris entre 1° et 80°.Machine according to claim 1, characterized in that the relative drive means of the supply coil (32) relative to the receiving coil (38) provide a relative amplitude of movement allowing the formation on said reception coil of a frustoconical profile or substantially conical of the edge (21) of the film forming with an axis (5) of the receiving coil an angle α between 1 ° and 80 °. Machine selon la revendication 2, caractérisée en ce que les moyens d'entraínement relatif de la bobine d'alimentation (32) par rapport à la bobine de réception (38) assurent une amplitude de déplacement relatif permettant la formation sur ladite bobine de réception d'un profil tronconique ou sensiblement conique de la lisière (21) du film formant avec un axe (5) de la bobine de réception un angle α compris entre 3° et 45°.Machine according to claim 2, characterized in that the relative drive means of the supply coil (32) relative to the receiving coil (38) provide a relative amplitude of movement allowing the formation on said reception coil of a frustoconical profile or substantially conical of the edge (21) of the film forming with an axis (5) of the receiving coil an angle α between 3 ° and 45 °. Machine selon la revendication 3, caractérisée en ce que les moyens d'entraínement relatif de la bobine d'alimentation (32) par rapport à la bobine de réception (38) assurent une amplitude de déplacement relatif permettant la formation sur ladite bobine de réception d'un profil tronconique ou sensiblement conique de la lisière (21) du film formant avec un axe (5) de la bobine de réception un angle α compris entre 5° et 45°.Machine according to claim 3, characterized in that the relative drive means of the supply coil (32) relative to the receiving coil (38) provide a relative amplitude of movement allowing the formation on said reception coil of a frustoconical profile or substantially conical of the edge (21) of the film forming with an axis (5) of the receiving coil an angle α between 5 ° and 45 °. Machine selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle comporte des moyens (23) d'entraínement alternatifs oscillant de la bobine d'alimentation (32) parallèlement à son axe (77) et/ou des moyens (27) d'entraínement alternatifs oscillant de la bobine de réception (38) parallèlement à son axe (5).Machine according to any one of the claims previous, characterized in that it comprises means (23) oscillating alternative drive of the supply coil (32) parallel to its axis (77) and / or alternative drive means (27) oscillating of the receiving coil (38) parallel to its axis (5). Machine selon la revendication 5, caractérisée en ce que les moyens (23,27) d'entraínement alternatif comportent un galet elliptique, ovale excentrique ou analogue, entraíné en rotation selon un axe (51,52) orthogonal à l'axe (77) de rotation de la bobine d'alimentation (32) et/ou de la bobine de réception (38) ; ledit galet entraínant ladite bobine d'alimentation et/ou de réception parallèlement audit axe de rotation de bobine (32,38).Machine according to claim 5, characterized in that the alternative drive means (23, 27) comprise an elliptical roller, eccentric oval or the like, driven in rotation about an axis (51,52) orthogonal to the axis (77) of rotation of the supply reel (32) and / or the take-up reel (38); said roller driving said supply coil and / or receiving parallel to said spindle rotation axis (32,38). Machine selon l'une quelconque des revendications précédentes, caractérisée en ce qu'elle comporte en outre des moyens d'étirage (33,34) d'un film étirable (36), des moyens de guidage (40,41,42,57,35) de films, des moyens (45,35,37) de bobinage de films (36) étirés sur la bobine de réception (38).Machine according to any one of the claims previous, characterized in that it further comprises means stretching (33,34) of a stretch film (36), guide means (40,41,42,57,35) of films, means (45,35,37) of film rewinding (36) drawn on the take-up spool (38). Machine selon la revendication 7, caractérisée en ce qu'elle comporte en outre des moyens (42,35) pour relâcher partiellement la tension mécanique dans le film après l'étirage et avant son bobinage sur la bobine de réception (38).Machine according to claim 7, characterized in that that it further comprises means (42,35) for partially relaxing the mechanical tension in the film after stretching and before it is wound on the take-up reel (38). Procédé de bobinage de films pré-étirés comportant une étape d'étirage d'un film (36) et une étape de bobinage du film étiré sur une bobine de réception (38) caractérisé en ce que, lors du bobinage, on assure un déplacement relatif des moyens (32) d'alimentation en films (36) et de la bobine de réception (38) de manière à faire varier périodiquement la position des lisières du film (36) selon l'axe (5) de la bobine de réception (38)., de manière à ce que la lisière (21) du film (36) bobiné présente sur la bobine de réception (38) un profil tronconique ou sensiblement conique.Method for winding pre-stretched films comprising a step of stretching a film (36) and a step of winding the stretched film on a receiving coil (38) characterized in that, during winding, it is ensured a relative displacement of the film supply means (32) (36) and of the take-up spool (38) so as to periodically vary the position edges of the film (36) along the axis (5) of the receiving reel (38)., so that the edge (21) of the wound film (36) has on the reel of receiving (38) a frustoconical or substantially conical profile. Procédé selon la revendication 9, caractérisé en ce que les déplacements relatifs des moyens d'alimentation en films par rapport à la bobine de réception (38) est un déplacement d'une bobine d'alimentation parallèlement à son axe (77) et/ou d'une bobine de réception (38) parallèlement à son axe (5).Method according to claim 9, characterized in that the relative displacements of the film supply means with respect to the take-up reel (38) is a displacement of a feed reel parallel to its axis (77) and / or a receiving coil (38) parallel to its axis (5). Procédé selon la revendication 10, caractérisé en ce que l'amplitude du déplacement est comprise entre 1 % et 4 %, de préférence entre 2 % et 2,4 %, de la largeur de la laize du film (36).Method according to claim 10, characterized in that the amplitude of the displacement is between 1% and 4%, preferably between 2% and 2.4%, the width of the width of the film (36). Procédé selon la revendication 9, 10 ou 11, caractérisé en ce qu'on effectue le bobinage avec variation périodique de la position des lisières du film (36) selon l'axe (5) de la bobine de réception (38), en sortie des moyens d'étirage (33,34) du film (36).Method according to claim 9, 10 or 11, characterized in what we do the winding with periodic variation of the position of edges of the film (36) along the axis (5) of the take-up reel (38), at the outlet stretching means (33,34) of the film (36). Procédé selon la revendication 10 ou 11, caractérisé en ce qu'on assure le déplacement alternatif oscillant de la bobine d'alimentation parallèlement à son axe. Method according to claim 10 or 11, characterized in which ensures the oscillating reciprocating movement of the supply coil parallel to its axis. Procédé selon l'une quelconque des revendications 10 à 13, caractérisé en ce qu'on bobine sur la bobine de réception (38) un film de suremballage ayant subi un étirage sous une tension comprise entre 10 et 20 N/mm2 de section initiale de laize, et en ce que le bobinage et la relaxation du film sur la bobine de réception (38) s'effectuent sous une tension mécanique comprise entre 10 et 90 % de la tension d'étirage.Method according to any one of claims 10 to 13, characterized in that a film of reel is wound onto the receiving reel (38) overpack having been stretched under a tension between 10 and 20 N / mm2 of initial width section, and in that the winding and the relaxation of film on the take-up reel (38) takes place under tension mechanical between 10 and 90% of the stretching tension. Bobine de film pré-étiré, caractérisée en ce qu'elle a été obtenue par le procédé selon l'une quelconque des revendications 7 à 11.Reel of pre-stretched film, characterized in that it has been obtained by the method according to any one of claims 7 to 11. Bobine de film selon la revendication 15, caractérisée en ce que le rapport de la tension mécanique dans le film bobiné dans la partie centrale de la bobine du film par rapport à la tension dans les lisières est compris entre 1 et 5, de préférence entre 1 et 3, de manière encore préférée entre 1,5 et 2,5.Film reel according to claim 15, characterized in what the ratio of mechanical tension in the film wound in the part center of the film reel with respect to the tension in the selvedges is between 1 and 5, preferably between 1 and 3, more preferably between 1.5 and 2.5. Bobine selon la revendication 15 ou 16, caractérisée en ce que le profil tronconique ou sensiblement conique forme avec l'axe (5) de la bobine un angle α compris entre 1° et 80°.Coil according to claim 15 or 16, characterized in what the frustoconical or substantially conical profile forms with the axis (5) of the coil an angle α between 1 ° and 80 °. Bobine selon la revendication 17, caractérisée en ce que le profil tronconique ou sensiblement conique forme avec l'axe (5) de la bobine un angle α compris entre 3° et 45°.Coil according to claim 17, characterized in that the frustoconical or substantially conical profile forms with the axis (5) of the coil at an angle α between 3 ° and 45 °. Bobine selon la revendication 18, caractérisée en ce que le profil tronconique ou sensiblement conique forme avec l'axe (5) de la bobine un angle α compris entre 5° et 45°.Coil according to claim 18, characterized in that the frustoconical or substantially conical profile forms with the axis (5) of the coil an angle α between 5 ° and 45 °.
EP98401058A 1997-05-13 1998-04-30 Machine to wind film, process for the manufacturing of pre-stretched film rolls, and rolls of pre-stretched film manufactured by this process Expired - Lifetime EP0878425B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9705857A FR2763321B1 (en) 1997-05-13 1997-05-13 FILM REWINDING MACHINE, METHOD FOR MANUFACTURING PRE-STRETCH FILM REELS AND PRE-STRET FILM REELS OBTAINED BY SAID METHOD
FR9705857 1997-05-13

Publications (2)

Publication Number Publication Date
EP0878425A1 true EP0878425A1 (en) 1998-11-18
EP0878425B1 EP0878425B1 (en) 2003-08-20

Family

ID=9506835

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98401058A Expired - Lifetime EP0878425B1 (en) 1997-05-13 1998-04-30 Machine to wind film, process for the manufacturing of pre-stretched film rolls, and rolls of pre-stretched film manufactured by this process

Country Status (7)

Country Link
US (1) US5967437A (en)
EP (1) EP0878425B1 (en)
AT (1) ATE247594T1 (en)
CA (1) CA2237042C (en)
DE (1) DE69817255T2 (en)
ES (1) ES2205402T3 (en)
FR (1) FR2763321B1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19944703A1 (en) * 1999-08-16 2001-02-22 Voith Paper Patent Gmbh Process for winding up a running material web

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2230940B1 (en) * 2002-06-04 2006-01-16 Intermas Nets S.A. METHOD FOR FOLDING, IN THE FORM OF A LARGE DIAMETER ROLL, OF A TUBULAR FABRIC.
FR2848541B1 (en) * 2002-12-16 2006-01-06 Gsl Holding PROCESS FOR PREPARING A PRE-STRESSED MEDICAL BAND, BAND THUS OBTAINED AND DEVICE FOR CARRYING OUT SAID METHOD
US20060113421A1 (en) * 2004-11-30 2006-06-01 Stanford Products Llc Method and apparatus for forming a roll of material
US20100015422A1 (en) 2008-07-21 2010-01-21 Paragon Films, Inc. Oriented Film Produced In-Process for Use in the Stretch Film Market
US9908284B2 (en) * 2009-11-20 2018-03-06 Anthony Galea Stretch film and method of fabrication therefor
US20110151217A1 (en) * 2009-12-18 2011-06-23 Paragon Films, Inc. Oriented Film Produced In-Process for Use in the Power Stretch Film Market
US20140208905A1 (en) * 2013-01-31 2014-07-31 Anthony Galea Method and apparatus for fabricating stretch film rolls
DE102014006933B4 (en) 2014-05-10 2016-02-25 Sml Maschinengesellschaft M.B.H. Method and device for producing a number of wound film rolls
US9630799B2 (en) * 2014-07-16 2017-04-25 Anthony Galea Method and apparatus for fabricating stretch film rolls
EP3967482A1 (en) 2020-09-09 2022-03-16 Bridgestone Bandag, LLC Method for forming a gum roll
EP4306466A1 (en) 2022-07-13 2024-01-17 SML Maschinengesellschaft m.b.H. Method for wrapping a sheet of material and wrapping device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1498363A (en) * 1966-06-02 1967-10-20 Novacel Sa Method and device for manufacturing small width ribbons from a large width strip
US3743563A (en) * 1970-12-17 1973-07-03 Ingenuics Inc Feed mechanism and conically-shaped mandrel having tacky surface for supporting web on its edge
WO1995013965A1 (en) * 1992-05-19 1995-05-26 Saltech Inc. Stretch film
DE4414003A1 (en) * 1994-04-22 1995-10-26 Kampf Gmbh & Co Maschf Method and device for winding webs of goods, in particular plastic films in a multiple turning machine
US5494237A (en) * 1994-04-04 1996-02-27 Alexander Machinery, Inc. Oscillatable web guide roll and method of winding

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3297155A (en) * 1965-11-26 1967-01-10 Borden Co Tubular cores
US4934622A (en) * 1989-04-11 1990-06-19 Eastman Kodak Company Core for winding a web of deformable material
US5531393A (en) * 1992-05-19 1996-07-02 Salzsauler; Donald J. Stretch film
FR2695102B1 (en) * 1992-08-25 1994-11-04 Newtec Int Method for overpacking loads using stretch film, machine and film for its implementation.

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1498363A (en) * 1966-06-02 1967-10-20 Novacel Sa Method and device for manufacturing small width ribbons from a large width strip
US3743563A (en) * 1970-12-17 1973-07-03 Ingenuics Inc Feed mechanism and conically-shaped mandrel having tacky surface for supporting web on its edge
WO1995013965A1 (en) * 1992-05-19 1995-05-26 Saltech Inc. Stretch film
US5494237A (en) * 1994-04-04 1996-02-27 Alexander Machinery, Inc. Oscillatable web guide roll and method of winding
DE4414003A1 (en) * 1994-04-22 1995-10-26 Kampf Gmbh & Co Maschf Method and device for winding webs of goods, in particular plastic films in a multiple turning machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19944703A1 (en) * 1999-08-16 2001-02-22 Voith Paper Patent Gmbh Process for winding up a running material web

Also Published As

Publication number Publication date
FR2763321A1 (en) 1998-11-20
CA2237042A1 (en) 1998-11-13
DE69817255D1 (en) 2003-09-25
FR2763321B1 (en) 1999-07-23
ES2205402T3 (en) 2004-05-01
ATE247594T1 (en) 2003-09-15
CA2237042C (en) 2002-11-05
US5967437A (en) 1999-10-19
DE69817255T2 (en) 2004-07-01
EP0878425B1 (en) 2003-08-20

Similar Documents

Publication Publication Date Title
EP0419299B1 (en) Film unwinding carriage for a packaging machine
EP0300855B1 (en) Web with longitudinal reinforcement, its manufacture and its use in packaging methods and device for making such a web
EP0878425B1 (en) Machine to wind film, process for the manufacturing of pre-stretched film rolls, and rolls of pre-stretched film manufactured by this process
EP0056353B1 (en) Automatic machine for cutting, folding and preparing packages of sheets delivered from wound webs
FR2554799A1 (en) CORE-FREE HYGIENIC PAPER ROLL AND MANUFACTURING METHOD THEREOF
FR2470056A1 (en) METHODS AND APPARATUS FOR PERFORMING UNIT PACKAGING WITH STRETCHED PLASTIC MATERIAL
EP0656853B1 (en) Process for exterior packaging of loads using a stretch film and machine and film for carrying out said process
BE1015523A3 (en) Roll package and manufacturing method thereof.
FR2528023A1 (en) PROCESS AND DEVICE FOR THE RECOVERY OF FLAT PRODUCTS PRESENTING IN SCALE PROVISIONS, PARTICULARLY FOR THE RECOVERY OF PRINTED SHEETS
EP0806284B1 (en) Overwrapping film, film pre-stretching device and overwrapping method
WO2011064502A1 (en) Device for handling a strip of product containing rubber and method for producing a winding device onto which said strip is wound
EP1636123B1 (en) Centre-feed roll and production methods thereof
EP1747158B1 (en) Method for making a central unwinding roll and resulting roll
EP0944542B1 (en) Machine for coiling a flat continuous element to form rolls
FR2823190A1 (en) Plastic film wrapping machine re-loading procedure has stand-by film roll placed in machine and connected to injector mechanism as previous roll runs out
FR2625485A3 (en) Winder with an automatic cutting and fixing device
CA1023720A (en) Textile yarn support
EP0070243B1 (en) Method and apparatus for easily withdrawing wire from a wire coil irrespective of the original coiling method
EP0202983B1 (en) Process and machine for the manufacture of a multilayer thermal insulation around and along a solid passage, and cryogenic tank therefor
FR2560585A1 (en) Process for manufacturing a tearable spiral tube, device for the implementation of this process and spiral tube thus obtained.
FR2890385A1 (en) WINDING MACHINE FOR STORING FLAT ELEMENTS
FR2467811A1 (en) Elastomeric strip winding machine - has guide with vertical spindles reciprocated in front of frictionally driven height adjustable take up drum
FR2490144A2 (en) Scaled band rolls prodn. machine using scaled flat laid sacks - Includes winding core, holding band and swivelling frame with rollers and driven endless conveyor band
WO2021084191A1 (en) Method and device for manufacturing a conical filter
BE536810A (en)

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE

AX Request for extension of the european patent

Free format text: AL;LT;LV;MK;RO;SI

17P Request for examination filed

Effective date: 19990401

AKX Designation fees paid

Free format text: AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: ITW MIMA SYSTEMS

17Q First examination report despatched

Effective date: 20010712

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAG Despatch of communication of intention to grant

Free format text: ORIGINAL CODE: EPIDOS AGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LI LU NL PT SE

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: FRENCH

REF Corresponds to:

Ref document number: 69817255

Country of ref document: DE

Date of ref document: 20030925

Kind code of ref document: P

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: DR. LUSUARDI AG

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20031120

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

REG Reference to a national code

Ref country code: GR

Ref legal event code: EP

Ref document number: 20030404523

Country of ref document: GR

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 20031216

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20040120

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20040430

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2205402

Country of ref document: ES

Kind code of ref document: T3

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20040524

REG Reference to a national code

Ref country code: CH

Ref legal event code: PFA

Owner name: ITW MIMA SYSTEMS

Free format text: ITW MIMA SYSTEMS#"LES PLONGES", BOULEVARD LEPIC#73100 AIX-LES-BAINS (FR) -TRANSFER TO- ITW MIMA SYSTEMS#"LES PLONGES", BOULEVARD LEPIC#73100 AIX-LES-BAINS (FR)

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GR

Payment date: 20090428

Year of fee payment: 12

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: NL

Payment date: 20100424

Year of fee payment: 13

Ref country code: DE

Payment date: 20100428

Year of fee payment: 13

Ref country code: AT

Payment date: 20100401

Year of fee payment: 13

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20100426

Year of fee payment: 13

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20101103

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IE

Payment date: 20110426

Year of fee payment: 14

Ref country code: SE

Payment date: 20110425

Year of fee payment: 14

Ref country code: ES

Payment date: 20110426

Year of fee payment: 14

Ref country code: FR

Payment date: 20110504

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20110426

Year of fee payment: 14

Ref country code: FI

Payment date: 20110430

Year of fee payment: 14

Ref country code: GB

Payment date: 20110426

Year of fee payment: 14

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20110426

Year of fee payment: 14

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 69817255

Country of ref document: DE

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 69817255

Country of ref document: DE

REG Reference to a national code

Ref country code: NL

Ref legal event code: V1

Effective date: 20111101

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 247594

Country of ref document: AT

Kind code of ref document: T

Effective date: 20110430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110430

Ref country code: NL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20111101

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20110430

BERE Be: lapsed

Owner name: *ITW MIMA SYSTEMS

Effective date: 20120430

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20120430

REG Reference to a national code

Ref country code: SE

Ref legal event code: EUG

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20121228

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120430

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120430

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120501

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120430

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120430

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20111031

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20130716

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20120501