EP1747158A1 - Method for making a central unwinding roll and resulting roll - Google Patents

Method for making a central unwinding roll and resulting roll

Info

Publication number
EP1747158A1
EP1747158A1 EP05763745A EP05763745A EP1747158A1 EP 1747158 A1 EP1747158 A1 EP 1747158A1 EP 05763745 A EP05763745 A EP 05763745A EP 05763745 A EP05763745 A EP 05763745A EP 1747158 A1 EP1747158 A1 EP 1747158A1
Authority
EP
European Patent Office
Prior art keywords
sheet
winding
sheets
axis
travel
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
EP05763745A
Other languages
German (de)
French (fr)
Other versions
EP1747158B1 (en
Inventor
Yves-Michel Malecot
Joël HUNGLER
Jacky Postel
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.)
Essity Operations France SAS
Original Assignee
Georgia Pacific France 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 Georgia Pacific France SAS filed Critical Georgia Pacific France SAS
Publication of EP1747158A1 publication Critical patent/EP1747158A1/en
Application granted granted Critical
Publication of EP1747158B1 publication Critical patent/EP1747158B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B65H19/00—Changing the web roll
    • B65H19/22—Changing the web roll in winding mechanisms or in connection with winding operations
    • B65H19/2276—The web roll being driven by a winding mechanism of the coreless type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/22—Changing the web roll in winding mechanisms or in connection with winding operations
    • B65H19/2238—The web roll being driven by a winding mechanism of the nip or tangential drive type
    • B65H19/2246—The web roll being driven by a winding mechanism of the nip or tangential drive type and the roll being supported on two rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/22—Changing the web roll in winding mechanisms or in connection with winding operations
    • B65H19/28—Attaching the leading end of the web to the replacement web-roll core or spindle
    • 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
    • B65H2301/41419—Starting winding process
    • B65H2301/41429—Starting winding process in coreless applications
    • 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
    • B65H2301/4148—Winding slitting
    • 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
    • B65H2301/4148—Winding slitting
    • B65H2301/41485—Winding slitting winding on one single shaft or support
    • 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
    • B65H2301/415—Unwinding
    • B65H2301/41501—Special features of unwinding process
    • B65H2301/415016—Roll material fed from inner layer
    • 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
    • B65H2301/417—Handling or changing web rolls
    • B65H2301/418—Changing web roll
    • B65H2301/4182—Core or mandrel insertion, e.g. means for loading core or mandrel in winding position
    • B65H2301/41828—Core or mandrel insertion, e.g. means for loading core or mandrel in winding position in axial direction

Definitions

  • the invention relates to the field of rolls of absorbent paper or other similar material such as a nonwoven, intended for example for wiping. It relates in particular to the field of products for sanitary or domestic use such as wiping rolls or hand towels or toilet paper.
  • the rolls consist of a continuous sheet which has one or more plies.
  • the sheet is optionally precut into consecutive coupons in the winding direction, and is wound axially, preferably around an axis which may or may not support a mandrel; the roller can thus comprise a central mandrel or not.
  • the sheet can be unwound, either from the outer surface of the roll in the direction of the winding, or from the inside, from the center in the axial direction perpendicular to that of the winding of the roll.
  • the present invention relates to rollers which are used in central unwinding.
  • the roller has a mandrel, we must first extract it. In general, it has been designed so that it can be torn by pulling on its edge; most often at one end of the cardboard helical spiral that forms it.
  • this solution is not always satisfactory, since the extraction of the mandrel proves to be sometimes difficult if the rupture zone or zones are poorly formed. Moreover, this action may result in the 'first leaves the roll that become difficult to use.
  • the first turns of the sheet being. most often glued to the mandrel, they are unsuitable for any use and are therefore a cause of waste.
  • This mandrel is particularly expensive to produce, since generally, composed of two or more layers of cardboard bonded by gluing. It is also most often associated with a “hanging” glue of the first turn of the roll. It is no longer of any use once removed, and therefore becomes waste.
  • coils with central unwinding without a mandrel are also proposed. These are a priori easier to implement by the user, since it is no longer necessary to remove a mandrel before they are put into service. To achieve these, one can, in manufacturing, provide a temporary mandrel on which the sheet is wound. The mandrel is then removed, before the coils are conditioned.
  • the sheet is cut in line in the running or longitudinal direction, before winding, from a mother sheet of large width, and in as many strips as there are individual rolls to obtain.
  • the mother sheet is wound directly on a spindle, also without the interposition of a mandrel.
  • the initial sheet which is very wide, is first wound up so as to form a single coil with the final diameter of the individual roll, called "log" in the field. After formation, the log is extracted from the spindle and cut into individual rolls.
  • the sheet whether it is cellulose wadding, dry or wet crêpe, dry paper or a nonwoven, has a certain elasticity. Due to the internal stresses of the roll, due for example to the tightening of the sheet on the spindle during winding and / or to the tension of the sheet generated by the unwinding / winding operation by the machine, it cannot normally be avoided. reduction of the central hole by sagging or collapsing in the center of the first turns after the spindle has been removed. This collapse occurs, for example, after extraction of the spindle and / or when cutting the log, by the pressure exerted by the saw.
  • the central hole is of small diameter and the first turns remain difficult to access. They come in a tight, helical torch with a low "pitch", not very conducive to easy use. If the diameter of the central hole is larger, it is difficult to avoid associating the first turns between them.
  • a bonding agent is used which is deposited directly on the sheet or indirectly via the spindle or one of the winding cylinders, by a suitable system, when the first turns are wound on the spindle. Any other principle of association of the first turns between them, in particular by a mechanical process, is applicable. These first turns are thus consolidated, which together resist the stresses of internal constraints. However, here again, waste cannot be avoided during the commissioning of such a roller.
  • the subject of the invention is therefore a roller without a mandrel composed of a sheet of flexible material, such as an absorbent fibrous material with a total grammage between 15 and 300 g / m 2 , preferably between 15 and 100 g / m 2 , formed by winding around a winding axis, which does not have the drawbacks reported above.
  • the absorbent material can be cellulose wadding, dry or wet crepe, dry paper or a nonwoven. It can be made up of one or more folds, associated or not, possibly pre-cut into coupons. The material is dry. It is not humid; in particular it is not impregnated with lotion or any other liquid.
  • the present application relates to a new method constituting a variant of the methods described in the applicant's previous application.
  • the primer is produced by shifting before winding an end portion of the sheet so that one of its longitudinal edges forms a non-zero angle relative to said direction of travel, then the sheet is wound around the axis.
  • the sheet is rolled up on a winding support, such as a spindle.
  • the end portion is formed by cutting the sheet transversely relative to the direction of travel.
  • the method comprising the steps of producing the roll by winding the sheet perpendicularly around a winding axis, according to which: the sheet is arranged so that it extends perpendicularly on either side of the winding axis, the sheet is cut transversely with respect to the direction of travel so as to form an end portion, it is folded the end portion of the sheet on the winding axis of the roll, this portion of the end of the sheet is maintained on the winding axis, the sheet is rotated around the axis so that the '' to roll up, is characterized by the fact that before said transverse cutting, a portion of the sheet is arranged so that one of its longitudinal edges forms a non-zero angle ( ⁇ ) relative to the direction of travel (MD).
  • ⁇ non-zero angle
  • a wide sheet of flexible material is cut parallel to the direction of travel in a plurality of individual sheets arranged side by side, a portion of said sheets is moved laterally, said sheets are cut transversely with respect to the direction of travel to form end portions, the said sheets are wound around the axis and, each of the rollers is separated after their formation, thereby releasing each of the primers.
  • the roller (s) after winding of the roller (s), the rotation of the sheet (s) is stopped around said axis, the roller (s) are moved by sheet unwinding over a first distance determined according to the direction of travel (MD) , the roller or rollers are rotated in reverse with respect to the initial winding direction to unwind a given quantity of sheet, the roller or rollers are moved in the direction (CD) of their axis over a second predetermined distance, the or the sheets between the roller (s) and the cylinders transversely to said direction of travel. More generally, the displacements and the rotation are combined and adapted so as to avoid any breakage of the sheet.
  • the method comprises the steps according to which: the sheet is arranged so that it extends perpendicularly from one side and side of the winding support, is cut the sheet transversely to the direction of travel so as to form an end portion, end of the sheet is folded the portion on the roller of the winding carrier, " maintains this portion of the end of the sheet on the winding support, the winding support is rotated about its axis so as to wind the sheet. It is characterized by the fact that before said transverse cutting, arranges a portion of the sheet in such a way that one of its longitudinal edges forms a non-zero angle with respect to the direction of travel.
  • the winding support is placed relative to the sheet so that a portion thereof is disposed on one side of the support and the rest of the sheet the other, the sheet is cut transversely so as to form an end portion, the end portion is brought back to the support and the sheet is rolled up.
  • the process is preferably applied. when cutting a wide sheet of flexible material longitudinally into a plurality of individual sheets arranged side by side.
  • the rotation of the winding support is stopped, the support is moved by unwinding the sheet or sheets over a first determined distance parallel to the direction of travel, the support in reverse rotation with respect to the direction of the initial winding to unwind a given quantity of sheet, the support is moved parallel to its axis over a second predetermined distance, a new winding support is placed on the sheet or sheets, the sheet or sheets between the reel and the new winding support transverse to said direction of travel.
  • displacements and rotation are combined so as to avoid any breakage of the sheet.
  • glue is applied to the part of the sheets forming the tail of the roll (s).
  • the longitudinal edges of the tail portion of the rollers are realigned with the edges of the rollers, in particular by moving the winding support or the tail portion in opposite directions.
  • the primer is produced on the side opposite to that by which the support is extracted in order to limit the friction forces of the sheets in contact with the support and to facilitate its extraction.
  • the invention also relates to the roller obtained according to the method.
  • the length of the primer is at least 0.3 cm and preferably between 1 and 15 cm. It is in particular of tapered shape as well as the tail of the rollers.
  • the adhesive deposit is parallel to the non-longitudinal edge of the tail portion of the rollers.
  • - Figure 1 shows a roll without a mandrel of the prior art whose central hole is reduced
  • - Figure 2 shows a roll of the invention with a central unwinding leader projecting along the axis relative to a sides of the roll
  • - Figures 3 to 5 schematically show, in profile view, the progression of a sheet in a machine for making the rolls without a mandrel with wire feed
  • - Figure 6 shows the machine according to the figure 4
  • top view - Figures 7 to 10 schematically represent a machine in the different phases of the method according to the invention
  • - Figure 11 shows the machine in the configuration of Figure 9
  • - Figure 12 represents a roller obtained according to the method of the invention.
  • the paper is for example a cellulose wadding with two plies of 20 g / m 2 each, preferably associated.
  • the roll was obtained by winding a large sheet of 2600 mm in width, on a spindle-shaped winding support, for example with a circular section of diameter from 10 to 80 mm. After forming a roll, designated “log” in the field, of 20 cm in diameter for example, the spindle is extracted therefrom and taken to a sawing station. The rolls thus produced are then packaged for shipment. The roller is shown after the walls of the central hole have collapsed in the central direction.
  • FIG. 2 shows a roller (10 ') without mandrel resulting from the process of the invention or as described in patent application PCT / FR03 / 01776.
  • the central hole is reduced as in the previous case of the prior art.
  • the commissioning of the roll is greatly facilitated by the solution of the invention which consisted in forming a primer (10B) for central unwinding.
  • This primer is, according to the simplest embodiment, constituted by a portion of the internal end of the sheet forming the roll that is previously, before any collapse of the walls of the central hole, released, and put in protrusion from one of the sides of the roller.
  • This primer can be formed either when the roll is formed just before or during the winding of the sheet, or after the roll has been made when the hole is still formed, ie just after cutting, in any condition. preferably, soon after, as described in application PCT / FR03 / 01776.
  • this primer (10B) 0.3 to 20 cm long and preferably 1 cm to 15 cm, is formed by a portion of the inner end of the sheet, which has been folded into the direction of the winding axis of the roll and overflows relative to the side.
  • This primer thus forms a point gripping means which is flexible at its end and which can easily be folded against the side of the roller, to carry out the conditioning of said rollers before transport.
  • the tip is handy and can be easily inserted into a dispenser.
  • the length of the primer is chosen in particular for the ease with which it can be grasped and with which it can be introduced into the extraction orifice of a dispenser.
  • the length of the primer corresponds to the distance between the end of the primer and the side of the roller.
  • the primer can be reinforced with an additional element, coloring for example.
  • the primer can be reinforced mechanically by a tongue, or any suitable means, or additional element attached to the sheet and arranged to project from the axis of the roller.
  • the added element is then placed on the end of the sheet before winding or after separation of the rollers, projecting from one of the sides of the roll.
  • a method of manufacturing the rollers according to PCT / FR03 / 01776 is described below with reference to Figures 3 to 6 which show the essential elements of a roller winding machine. With this machine, a wide sheet 1 is cut online from a mother reel (3), before winding on a spindle (11).
  • the width of the sheet in the field of absorbent paper products is for example 2600 mm.
  • the sheet is cut in the longitudinal direction of travel by means of blades 5 arranged in parallel, in a plurality of individual sheets (10) whose width corresponds to the width of the individual rolls which it is desired to obtain.
  • the cutting means may consist of a series of blades arranged vertically or else discs cooperating with a support cylinder and cutting the sheet. Other means are known to those skilled in the art.
  • the sheets (10) are driven towards a device comprising two cylinders (7 and 9) parallel and driven in rotation by motor means not shown. The two cylinders are slightly spaced from each other. Once the sheets (10) in the position of FIG. 3, a spindle (11) forming the winding support is brought into place by suitable means.
  • the pin pinches the sheet against the cylinders (7 and 9), as can be seen in FIG. 4. It overlaps the space formed between these two contiguous drive cylinders.
  • the spindle thus delimits on one side an end portion (10A) of the sheets (10).
  • means (15) are provided which fold the end portion (10A) over the spindle (11). This means can consist of one or more judiciously oriented air jets.
  • a pressure roller (13) is lowered to hold the end (10A) of the sheets against the spindle.
  • the cylinders (7 and 9) are rotated. These rotate the spindle and the roller 13 on themselves allowing the sheet to be rolled up as seen in FIG. 5.
  • the means (15), here constituted by air jets, are inclined on the axis of rotation of the spindle so as to impart to these end portions a movement of transverse movement relative to the direction of movement of the sheets.
  • These end portions (10A ⁇ , IOA2, ...) are thus displaced in the direction of the winding axis.
  • each end portion, (10A- ⁇ ) for example, overflows on the side in the direction of the neighboring sheet, (10A 2 ).
  • the pressure roller (13) immobilizes the different end portions (10A ⁇ , 10A 2 , ...) against the spindle (11). Winding can begin.
  • FIG. 7 shows here four rollers (110 ′) being formed by winding sheets (1101 to 1104). The number of rollers may be different.
  • the sheets are cut from a wide sheet (110) in the direction of travel (MD) thereof by cutting means shown schematically by discs (105). They are mounted on a spindle or winding support (111) which is rotated in the direction of the arrow by the two cylinders (107 and 109) on which they rest. The cylinders (107 and 109) are themselves rotated by motor means, not shown. A pressure cylinder (113) ensures the cohesion of the assembly.
  • FIGS. 8A and 8B the winding of the rollers is finished; the assembly was moved with the spindle over a first distance (L3) determined in the direction of travel (MD) mentioned above, leaving the sheets to unwind.
  • the rollers were placed with the spindle on supports (107 'and 109').
  • the supports (107 'and 109') are preferably parallel to the cylinders (107 and 109).
  • the spindle is driven in rotation a fraction of a turn, in the opposite direction to the initial winding direction, in the direction of the arrow in FIG. 8B to form a loop by unwinding a given quantity of sheet.
  • a jack (120) which moves the spindle (111) fitted with the rollers, preferably parallel in the direction of its axis, over a second determined distance (L2) in the direction of the arrow ( CD).
  • L2 second determined distance
  • the longitudinal edges of the sheets now make an angle ( ⁇ ) relative to the initial direction of travel (MD).
  • the angular offset occurs from the blades (105) for the longitudinal section of the sheet (110) which are located upstream of the cylinders (107 and 109).
  • This angular offset is preferably done in the same plane as that of the scrolling.
  • it can be carried out according to an adapted trajectory having at least components in the directions (MD) and (CD)
  • a new pin (111 ') is deposited on the sheets at the cylinders (107 and 109). The sheets are thus pinched between the spindle (111 ') and these cylinders.
  • the winding of the rollers (110) ′ is completed in such a way that the end ends or tail portions (110B) of the sheets coated with glue G are fixed on their respective rolls, so that the longitudinal edges of said portions of tail (110B) align as best as possible on their respective roll.
  • the edges generated by the cross section do not form a right angle with the edges sheets (110).
  • the end portion (110A) which forms the primer thus has a tapered shape conducive to easier introduction into a dispensing orifice of a reel.
  • the tail portion (110B) is also tapered and is characterized by this method. The rolls are finished.
  • the spindle is separated from the rollers and the primers are released by moving the rollers apart from each other.
  • the machine is ready to take up a new set of rollers.
  • the first step then consists in folding down the end portions (110A) on the spindle. Because of their inclination relative to the direction of travel of the sheet (angle ⁇ ), these sheet portions (110A) folded over the spindle each form a primer and overlap the adjacent roller. The rest of the sheets which have not undergone this lateral offset are wound, staying perpendicular to the axis of the spindle to form the rolls. It is observed that, with respect to a known roller winding installation, it was sufficient to include a jack (120) which controls the axial movement of the spindle over a short distance.
  • the length of the spindle (111) displacement in the axial direction depends on the length of the wire feeder.
  • products have been produced on an industrial machine.
  • a primer length C of about 60 mm is obtained.
  • (C L2xL / L1).
  • Figure 12 there is shown a roll with the last sheet
  • this angle is complementary to the angle ( ⁇ ).

Landscapes

  • Replacement Of Web Rolls (AREA)
  • Sanitary Thin Papers (AREA)
  • Winding Of Webs (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Reduction Rolling/Reduction Stand/Operation Of Reduction Machine (AREA)

Abstract

This invention relates to a method for the production of a coreless roll (110′) including a sheet (110) of flexible, not moist, material such as a fibrous absorbent material, produced by winding of the sheet in one direction and rolling this sheet about a winding axis perpendicular to such direction, and including a central dispensing leader forming a projection along such axis relative to at least one part of the plane of one of the sides of the roll. The method is characterized in that the leader is produced by displacing a portion of the end of the sheet (110) before winding so that one of the longitudinal edges of the sheet forms an angle (α) other than zero relative to such direction of winding, after which winding of the sheet about the axis is initiated. By preference several sheets are produced by longitudinal cutting of a wide sheet. The solution may be applied for production in particular of general wipe rolls, hand towel rolls, or toilet paper rolls.

Description

PROCEDE DE FABRICATION D'UN ROULEAU A DEVIDAGE CENTRAL ET ROULEAU OBTENU L'invention concerne le domaine des rouleaux de papier absorbant ou autre matériau semblable tel qu'un non-tissé, destiné par exemple à l'essuyage. Elle concerne en particulier le domaine des produits à usage sanitaire ou domestique tels que des rouleaux d'essuyage ou d'essuie-mains ou le papier hygiénique. Pour ces applications, les rouleaux sont constitués d'une feuille continue qui comporte un ou plusieurs plis. La feuille est éventuellement prédécoupée en coupons consécutifs dans la direction du bobinage, et est enroulée axialement, préférentiellement autour d'un axe qui peut supporter ou non un mandrin ; le rouleau peut ainsi comprendre un mandrin central ou non. La feuille peut être dévidée, soit à partir de la surface externe du rouleau dans la direction du bobinage, soit par l'intérieur, à partir du centre dans la direction axiale perpendiculaire à celle du bobinage du rouleau. Dans ce dernier cas, on dit que le rouleau est à dévidage central. La présente invention a pour objet les rouleaux que l'on utilise en dévidage central. Quand le rouleau comporte un mandrin, on doit commencer par extraire celui-ci. En général, il a été conçu pour qu'on puisse le déchirer en tirant sur son bord ; le plus souvent, à l'une des extrémités de la spirale hélicoïdale en carton qui le forme. Cependant, la pratique montre que cette solution n'est pas toujours satisfaisante, car l'extraction du mandrin se révèle être parfois difficile si la ou les zones de rupture sont mal formées. De plus, cette action peut entraîner les' premières feuilles du rouleau qui deviennent difficilement utilisables. En outre, les premières spires de la feuille étant. le plus souvent collées au mandrin, elles sont impropres à toute utilisation et sont alors une cause de déchets. Ce mandrin est particulièrement coûteux à réaliser, puisque généralement, composé de deux ou plusieurs couches de carton liées par collage. Il est associé également le plus souvent à une colle « d'accrochage » de la première spire du rouleau. Il n'est de plus d'aucune utilité une fois retiré, et devient donc un déchet. Pour pallier cet inconvénient, on propose aussi des bobines à dévidage central sans mandrin. Celles-ci sont à priori de mise en œuvre plus facile par l'utilisateur, car il n'est plus nécessaire d'enlever un mandrin préalablement à leur mise en service. Pour réaliser celles-ci, on peut, en fabrication, prévoir un mandrin provisoire sur lequel on enroule la feuille. On retire ensuite le mandrin, avant le conditionnement des bobines. Cette technique présente des contraintes sur le plan industriel car il faut ajouter un poste d'extraction des mandrins à la ligne de bobinage. A cela s'ajoute le coût de la colle et du mandrin. Selon un mode de fabrication sans mandrin, la feuille est découpée en ligne dans le sens marche ou longitudinal, avant bobinage, à partir d'une feuille mère de grande largeur, et en autant de bandes que de rouleaux individuels à obtenir. Selon un autre mode de fabrication, on enroule directement la feuille mère sur une broche, également sans interposition de mandrin. La feuille initiale qui est de grande largeur, est d'abord enroulée de manière à former une bobine unique au diamètre définitif du rouleau individuel, appelé « log » dans le domaine. Après formation, on extrait le log de la broche et on le tronçonne en rouleaux individuels. Cependant, la feuille, que ce soit de l'ouate de cellulose, crêpée sec ou humide, du papier voie sèche ou un non-tissé, présente une certaine élasticité. En raison des contraintes internes du rouleau, dues par exemple au serrage de la feuille sur la broche pendant le bobinage et/ou à la tension de la feuille que génère l'opération de déroulement/enroulement par la machine, on ne peut éviter normalement la réduction du trou central par l'affaissement ou l'effondrement au centre des premières spires après que l'on a retiré la broche. Cet effondrement se produit, par exemple, après extraction de la broche et/ou au moment de la coupe du log, par la pression exercée par la scie. En tout état de cause, on constate une réduction partielle ou totale du trou central au cours des manutentions et transport, en raison des vibrations inévitables auxquels les rouleaux sont soumis. Lorsque le trou central est complètement réduit, il est difficile de le reformer au moins à la main, et la préhension de la première spire n'est pas aisée. Il s'ensuit inévitablement des déchets, notamment pour la mise en service du rouleau dans un distributeur, car on est amené alors à saisir plusieurs spires à la fois. On sait réaliser des rouleaux sans mandrin dont le trou central reste formé après extraction de la broche et/ou après coupe par une scie. On peut utiliser par exemple une broche dont le profil, cannelé ou polygonal, permet la formation d'un trou dont les parois sont auto-portantes. Un exemple de réalisation est illustré par le brevet FR 2554799. Néanmoins, le trou central est de faible diamètre et les premières spires restent difficiles d'accès. Elles se présentent en une torche serrée, hélicoïdale à faible « pas », peu propice à une utilisation aisée. Si le diamètre du trou central est plus important, on peut difficilement éviter d'associer les premières spires entre elles. Pour cela on emploie un agent de liaison que l'on dépose directement sur la feuille ou indirectement via la broche ou un des cylindres de bobinage, par un système adapté, au moment de l'enroulement des premières spires sur la broche. Tout autre principe d'association des premières spires entre elles, par un procédé mécanique notamment, est applicable. On consolide ainsi ces premières spires qui ensemble résistent aux efforts des contraintes internes. Cependant, là encore, on ne peut éviter les déchets lors de la mise en service d'un tel rouleau. Que ce soit dans le cas d'une utilisation directe ou dans le cas où l'on utilise ce rouleau dans un distributeur à dévidage central dans lequel on doit introduire l'extrémité de la feuille dans un orifice de distribution relativement étroit, on est obligé d'éliminer au préalable les premières spires associées entre elles. Dans ce dernier type de réalisation également, on ne peut éviter que certains rouleaux ne soient choqués lors du transport, avec comme conséquence l'affaissement du trou central comme dans les cas mentionnés plus haut. Pour éviter ce risque, on prévoit d'ailleurs de conditionner preférentiellement les rouleaux dans des caisses en carton, contrairement aux rouleaux avec mandrin qui se suffisent d'une enveloppe souple en papier ou en matière plastique. Le coût s'en trouve considérablement augmenté. L'intérêt que l'on pouvait trouver à ces rouleaux sans mandrin par rapport aux rouleaux avec mandrin en est ainsi fortement diminué. L'invention a donc pour objet un rouleau sans mandrin composé d'une feuille de matériau souple, tel qu'un matériau fibreux absorbant d'un grammage total compris entre 15 et 300 g/m2, preférentiellement entre 15 et 100 g/m2, formé par enroulement autour d'un axe de bobinage, qui ne présente pas les inconvénients rapportés ci-dessus. Le matériau absorbant peut être une ouate de cellulose, crêpée sec ou humide, un papier voie sèche ou un non-tissé. Il peut être composé d'un ou de plusieurs plis, associés ou non, éventuellement prédécoupés en coupons. Le matériau est à l'état sec. Il n'est pas humide ; en particulier il n'est pas imprégné de lotion ou de tout autre liquide. La demanderesse a déposé, sous le numéro PCT/FR03/01776 le 12 juin 2003, une demande de brevet portant sur un rouleau comprenant une amorce de dévidage central formant une saillie le long dudit axe de bobinage par rapport à au moins une partie du plan de l'un des flancs du rouleau. L'invention selon cette demande de brevet s'applique en particulier aux rouleaux dont le bobinage est réalisé dans des conditions de forte tension de la feuille et de serrage sur le support de bobinage, qui permettent de produire des rouleaux à fort métrage mais qui conduisent inévitablement à la réduction du trou central. En particulier, l'amorce de dévidage central est constituée d'une portion de l'extrémité interne de la feuille, formant le rouleau individuel. La solution de l'invention selon cette demande de brevet permet de se libérer de tous les problèmes liés à la réduction du trou central puisqu'on a accès à la première feuille depuis l'extérieur du rouleau. De ce fait, il n'est plus nécessaire de lier les premières spires entre elles pour essayer de maintenir le trou formé. On évite ainsi les déchets, tant au niveau de la machine de production en raison de l'absence de système d'association des premières spires, que lors de la mise en service du rouleau. On peut donc conditionner les rouleaux dans de simples emballages souples, notamment plastiques. En particulier, cette amorce est formée par rabattement transversal d'une portion de l'extrémité de la feuille sur l'axe de bobinage du rouleau ; elle présente ainsi une forme effilée. On a alors l'avantage supplémentaire de faciliter l'introduction de l'extrémité de l'amorce dans le dispositif de distribution d'un distributeur à dévidage central, par exemple. La présente demande porte sur un nouveau procédé constituant une variante des procédés décrits dans la demande antérieure de la demanderesse. Conformément à l'invention, le procédé de fabrication d'un rouleau sans mandrin composé d'une feuille de matériau souple non humide tel qu'un matériau fibreux absorbant réalisé par défilement de la feuille dans une direction et son enroulement autour d'un axe de bobinage perpendiculaire à ladite direction, et comprenant une amorce de dévidage central formant une saillie le long dudit axe par rapport à au moins une partie du plan de l'un des flancs du rouleau. Il est caractérisé par le fait qu'on réalise l'amorce en décalant avant enroulement une portion d'extrémité de la feuille de manière à ce qu'un de ses bords longitudinaux forme un angle non nul par rapport à ladite direction de défilement, puis on procède à l'enroulement de la feuille autour de l'axe. De préférence, la mise en rouleau de la feuille est réalisée sur un support de bobinage, tel qu'une broche. En particulier, on forme la portion d'extrémité en découpant la feuille transversalement par rapport à la direction de défilement. Ce procédé présente l'avantage de pouvoir être appliqué très simplement sur une installation industrielle existante, en y apportant des modifications mineures. Plus précisément, le procédé comprenant les étapes de réalisation du rouleau par enroulement de la feuille perpendiculairement autour d'un axe de bobinage, selon lesquelles : on dispose la feuille de façon qu'elle s'étende perpendiculairement de part et d'autre de l'axe de bobinage, on découpe la feuille transversalement par rapport à la direction de défilement de manière à former une portion d'extrémité, on rabat la portion d'extrémité de la feuille sur l'axe de bobinage du rouleau, on maintient cette portion de l'extrémité de la feuille sur l'axe de bobinage, on met la feuille en rotation autour de l'axe de façon à l'enrouler, est caractérisé par le fait qu'avant la dite découpe transversale, on dispose une portion de la feuille de façon à ce que l'un de ses bords longitudinaux forme un angle (α) non nul par rapport à la direction de défilement (MD). Selon un mode de réalisation préféré, on découpe parallèlement à la direction de défilement une large feuille de matériau souple en une pluralité de feuilles individuelles disposées côte à côte, on déplace latéralement une portion desdites feuilles, on découpe les dites feuilles transversalement par rapport à la direction de défilement pour former des portions d'extrémité, on enroule les dites feuilles autour de l'axe et, on sépare chacun des rouleaux après leur formation, libérant ainsi chacune des amorces. Selon une autre caractéristique, après enroulement du ou des rouleaux, on arrête la rotation de la ou des feuilles autour du dit axe, on déplace le ou les rouleaux par déroulement de feuille sur une première distance déterminée selon à la direction de défilement (MD), on entraîne le ou les rouleaux en rotation inverse par rapport au sens de bobinage initial pour dérouler une quantité donnée de feuille, on déplace le ou les rouleaux selon la direction (CD) de leur axe sur une deuxième distance prédéterminée, on découpe la ou les feuilles entre le ou les rouleaux et les cylindres transversalement à ladite direction de défilement. Plus généralement, les déplacements et la rotation sont combinés et adaptés de manière à éviter toute casse de feuille. Conformément à un mode de réalisation avec support de bobinage, dans lequel on enroule la feuille perpendiculairement autour d'un support de bobinage, le procédé comprend les étapes selon lesquelles : on dispose la feuille de façon qu'elle s'étende perpendiculairement de part et d'autre du support de bobinage, on découpe la feuille transversalement par rapport à la direction de défilement de manière à former une portion d'extrémité, on rabat la portion d'extrémité de la feuille sur le support de bobinage du rouleau, on" maintient cette portion de l'extrémité de la feuille sur le support de bobinage, on met le support de bobinage en rotation autour de son axe de façon à enrouler la feuille. Il est caractérisé par le fait qu'avant la dite découpe transversale, on dispose une portion de la feuille de façon à ce que l'un de ses bords longitudinaux forme un angle non nul par rapport à la direction de défilement. Conformément à une autre caractéristique, on déplace latéralement une portion de feuille par rapport à la direction de défilement, on place le support de bobinage par rapport à la feuille de manière qu'une portion de celle-ci soit disposée d'un côté du support et le reste de la feuille de l'autre, on découpe la feuille transversalement de manière à former une portion d'extrémité, on ramène la portion d'extrémité sur le support et on enroule la feuille. Le procédé s'applique de préférence . lorsque l'on découpe longitudinalement une large feuille de matériau souple en une pluralité de feuilles individuelles disposées côte à côte. Il est alors caractérisé par les étapes suivantes : on déplace latéralement une portion desdites feuilles, on place le support sur les portions de feuilles; on découpe les dites feuilles transversalement par rapport à la direction de défilement pour former des portions d'extrémité, on enroule les dites feuilles autour du support de bobinage et, on sépare chacun des rouleaux après leur formation, libérant ainsi l'amorce de chacun des rouleaux. Selon un mode de réalisation préféré, après avoir formé le ou les rouleaux, on arrête la rotation du support de bobinage, on déplace le support par déroulement de la ou des feuilles sur une première distance déterminée parallèlement à la direction de défilement, on entraîne le support en rotation inverse par rapport au sens du bobinage initial pour dérouler une quantité donnée de feuille, on déplace le support parallèlement à son axe sur une deuxième distance prédéterminée, on met en place sur la ou les feuilles un nouveau support de bobinage, on découpe la ou les feuilles entre la bobine et le nouveau support de bobinage transversalement à ladite direction de défilement. Pour rendre l'opération plus sûre, les déplacements et la rotation sont combinés de manière à éviter toute casse de feuille. Conformément à une autre caractéristique, avant de découper la ou les feuilles on applique de la colle sur la partie des feuilles formant la queue du ou des rouleaux. Conformément à une autre caractéristique, après avoir découpé les feuilles, on réaligne les bords longitudinaux de la portion de queue des rouleaux avec les bords des rouleaux, notamment par déplacement en sens inverse du support de bobinage ou de la portion de queue. De préférence, l'amorce est réalisée du côté opposé à celui par lequel on extrait le support afin de limiter les efforts de friction des feuilles en contact avec le support et de faciliter son extraction. L'invention porte aussi sur le rouleau obtenu selon le procédé. La longueur de l'amorce est d'au moins 0,3 cm et de préférence entre 1 et 15 cm. Elle est en particulier de forme effilée ainsi que la queue des rouleaux. Enfin le dépôt de colle est parallèle au bord non longitudinal de la portion de queue des rouleaux. On va maintenant décrire l'invention plus en détail en référence aux dessins joints en annexe sur lesquels :The invention relates to the field of rolls of absorbent paper or other similar material such as a nonwoven, intended for example for wiping. It relates in particular to the field of products for sanitary or domestic use such as wiping rolls or hand towels or toilet paper. For these applications, the rolls consist of a continuous sheet which has one or more plies. The sheet is optionally precut into consecutive coupons in the winding direction, and is wound axially, preferably around an axis which may or may not support a mandrel; the roller can thus comprise a central mandrel or not. The sheet can be unwound, either from the outer surface of the roll in the direction of the winding, or from the inside, from the center in the axial direction perpendicular to that of the winding of the roll. In the latter case, it is said that the roller has central unwinding. The present invention relates to rollers which are used in central unwinding. When the roller has a mandrel, we must first extract it. In general, it has been designed so that it can be torn by pulling on its edge; most often at one end of the cardboard helical spiral that forms it. However, practice shows that this solution is not always satisfactory, since the extraction of the mandrel proves to be sometimes difficult if the rupture zone or zones are poorly formed. Moreover, this action may result in the 'first leaves the roll that become difficult to use. In addition, the first turns of the sheet being. most often glued to the mandrel, they are unsuitable for any use and are therefore a cause of waste. This mandrel is particularly expensive to produce, since generally, composed of two or more layers of cardboard bonded by gluing. It is also most often associated with a “hanging” glue of the first turn of the roll. It is no longer of any use once removed, and therefore becomes waste. To overcome this drawback, coils with central unwinding without a mandrel are also proposed. These are a priori easier to implement by the user, since it is no longer necessary to remove a mandrel before they are put into service. To achieve these, one can, in manufacturing, provide a temporary mandrel on which the sheet is wound. The mandrel is then removed, before the coils are conditioned. This technique presents constraints on the industrial level because it is necessary to add a mandrel extraction station to the winding line. Added to this is the cost of the glue and the mandrel. According to a mode of manufacture without a mandrel, the sheet is cut in line in the running or longitudinal direction, before winding, from a mother sheet of large width, and in as many strips as there are individual rolls to obtain. According to another manufacturing method, the mother sheet is wound directly on a spindle, also without the interposition of a mandrel. The initial sheet, which is very wide, is first wound up so as to form a single coil with the final diameter of the individual roll, called "log" in the field. After formation, the log is extracted from the spindle and cut into individual rolls. However, the sheet, whether it is cellulose wadding, dry or wet crêpe, dry paper or a nonwoven, has a certain elasticity. Due to the internal stresses of the roll, due for example to the tightening of the sheet on the spindle during winding and / or to the tension of the sheet generated by the unwinding / winding operation by the machine, it cannot normally be avoided. reduction of the central hole by sagging or collapsing in the center of the first turns after the spindle has been removed. This collapse occurs, for example, after extraction of the spindle and / or when cutting the log, by the pressure exerted by the saw. In any event, there is a partial or total reduction in the central hole during handling and transport, due to the inevitable vibrations to which the rollers are subjected. When the central hole is completely reduced, it is difficult to reform it at least by hand, and gripping the first turn is not easy. There is inevitably waste, especially for the commissioning of the roller in a dispenser, because it is then necessary to enter several turns at a time. We know how to make rolls without a mandrel, the central hole of which remains formed after extraction from the spindle and / or after cutting with a saw. One can use for example a spindle whose profile, fluted or polygonal, allows the formation of a hole whose walls are self-supporting. An exemplary embodiment is illustrated by patent FR 2554799. However, the central hole is of small diameter and the first turns remain difficult to access. They come in a tight, helical torch with a low "pitch", not very conducive to easy use. If the diameter of the central hole is larger, it is difficult to avoid associating the first turns between them. For this, a bonding agent is used which is deposited directly on the sheet or indirectly via the spindle or one of the winding cylinders, by a suitable system, when the first turns are wound on the spindle. Any other principle of association of the first turns between them, in particular by a mechanical process, is applicable. These first turns are thus consolidated, which together resist the stresses of internal constraints. However, here again, waste cannot be avoided during the commissioning of such a roller. Whether in the case of direct use or in the case where this roller is used in a dispenser with central unwinding in which the end of the sheet has to be introduced into a relatively narrow dispensing orifice, we are obliged first eliminate the first coils associated with each other. In the latter type of embodiment also, it is not possible to prevent certain rollers from being shocked during transport, with as Consequently, the central hole collapses as in the cases mentioned above. To avoid this risk, provision is also made for preferably packaging the rollers in cardboard boxes, unlike rollers with a mandrel which are sufficient with a flexible envelope made of paper or plastic. The cost is considerably increased. The interest which one could find in these rollers without mandrel compared to rollers with mandrel is thus greatly diminished. The subject of the invention is therefore a roller without a mandrel composed of a sheet of flexible material, such as an absorbent fibrous material with a total grammage between 15 and 300 g / m 2 , preferably between 15 and 100 g / m 2 , formed by winding around a winding axis, which does not have the drawbacks reported above. The absorbent material can be cellulose wadding, dry or wet crepe, dry paper or a nonwoven. It can be made up of one or more folds, associated or not, possibly pre-cut into coupons. The material is dry. It is not humid; in particular it is not impregnated with lotion or any other liquid. The plaintiff filed, under number PCT / FR03 / 01776 on June 12, 2003, a patent application relating to a roll comprising a central unwinding leader forming a projection along said winding axis with respect to at least part of the plane from one of the sides of the roll. The invention according to this patent application applies in particular to rollers, the winding of which is carried out under conditions of high tension of the sheet and of clamping on the winding support, which make it possible to produce rolls with high footage but which lead inevitably to the reduction of the central hole. In particular, the central unwinding leader consists of a portion of the inner end of the sheet, forming the individual roll. The solution of the invention according to this patent application makes it possible to free oneself from all the problems associated with the reduction of the central hole since there is access to the first sheet from the outside of the roll. Therefore, it is no longer necessary to link the first turns together to try to maintain the hole formed. This avoids waste, both at the level of the production machine due to the absence of an association system for the first turns, and when the roll is put into service. The rolls can therefore be packaged in simple flexible packaging, in particular plastic. In particular, this primer is formed by transverse folding down of a portion of the end of the sheet on the winding axis of the roll; it thus has a tapered shape. There is then the additional advantage of facilitating the introduction of the end of the primer into the dispensing device of a dispenser with central reel, for example. The present application relates to a new method constituting a variant of the methods described in the applicant's previous application. According to the invention, the method of manufacturing a roll without a mandrel composed of a sheet of non-moist flexible material such as an absorbent fibrous material produced by scrolling the sheet in one direction and its winding around an axis winding perpendicular to said direction, and comprising a central unwinding initiator forming a projection along said axis with respect to at least part of the plane of one of the sides of the roll. It is characterized by the fact that the primer is produced by shifting before winding an end portion of the sheet so that one of its longitudinal edges forms a non-zero angle relative to said direction of travel, then the sheet is wound around the axis. Preferably, the sheet is rolled up on a winding support, such as a spindle. In particular, the end portion is formed by cutting the sheet transversely relative to the direction of travel. This process has the advantage of being able to be applied very simply to an existing industrial installation, with minor modifications. More specifically, the method comprising the steps of producing the roll by winding the sheet perpendicularly around a winding axis, according to which: the sheet is arranged so that it extends perpendicularly on either side of the winding axis, the sheet is cut transversely with respect to the direction of travel so as to form an end portion, it is folded the end portion of the sheet on the winding axis of the roll, this portion of the end of the sheet is maintained on the winding axis, the sheet is rotated around the axis so that the '' to roll up, is characterized by the fact that before said transverse cutting, a portion of the sheet is arranged so that one of its longitudinal edges forms a non-zero angle (α) relative to the direction of travel (MD). According to a preferred embodiment, a wide sheet of flexible material is cut parallel to the direction of travel in a plurality of individual sheets arranged side by side, a portion of said sheets is moved laterally, said sheets are cut transversely with respect to the direction of travel to form end portions, the said sheets are wound around the axis and, each of the rollers is separated after their formation, thereby releasing each of the primers. According to another characteristic, after winding of the roller (s), the rotation of the sheet (s) is stopped around said axis, the roller (s) are moved by sheet unwinding over a first distance determined according to the direction of travel (MD) , the roller or rollers are rotated in reverse with respect to the initial winding direction to unwind a given quantity of sheet, the roller or rollers are moved in the direction (CD) of their axis over a second predetermined distance, the or the sheets between the roller (s) and the cylinders transversely to said direction of travel. More generally, the displacements and the rotation are combined and adapted so as to avoid any breakage of the sheet. In accordance with an embodiment with a winding support, in which the sheet is wound perpendicularly around a winding support, the method comprises the steps according to which: the sheet is arranged so that it extends perpendicularly from one side and side of the winding support, is cut the sheet transversely to the direction of travel so as to form an end portion, end of the sheet is folded the portion on the roller of the winding carrier, " maintains this portion of the end of the sheet on the winding support, the winding support is rotated about its axis so as to wind the sheet. It is characterized by the fact that before said transverse cutting, arranges a portion of the sheet in such a way that one of its longitudinal edges forms a non-zero angle with respect to the direction of travel. laterally places a portion of sheet relative to the direction of travel, the winding support is placed relative to the sheet so that a portion thereof is disposed on one side of the support and the rest of the sheet the other, the sheet is cut transversely so as to form an end portion, the end portion is brought back to the support and the sheet is rolled up. The process is preferably applied. when cutting a wide sheet of flexible material longitudinally into a plurality of individual sheets arranged side by side. It is then characterized by the following stages: a portion of said sheets is moved laterally, the support is placed on the sheet portions; said sheets are cut transversely relative to the direction of travel to form end portions, said sheets are wrapped around the winding support and, each of the rollers is separated after their formation, thereby releasing the primer from each of the rollers. According to a preferred embodiment, after having formed the roller (s), the rotation of the winding support is stopped, the support is moved by unwinding the sheet or sheets over a first determined distance parallel to the direction of travel, the support in reverse rotation with respect to the direction of the initial winding to unwind a given quantity of sheet, the support is moved parallel to its axis over a second predetermined distance, a new winding support is placed on the sheet or sheets, the sheet or sheets between the reel and the new winding support transverse to said direction of travel. To make the operation safer, displacements and rotation are combined so as to avoid any breakage of the sheet. According to another characteristic, before cutting the sheet or sheets, glue is applied to the part of the sheets forming the tail of the roll (s). According to another characteristic, after cutting the sheets, the longitudinal edges of the tail portion of the rollers are realigned with the edges of the rollers, in particular by moving the winding support or the tail portion in opposite directions. Preferably, the primer is produced on the side opposite to that by which the support is extracted in order to limit the friction forces of the sheets in contact with the support and to facilitate its extraction. The invention also relates to the roller obtained according to the method. The length of the primer is at least 0.3 cm and preferably between 1 and 15 cm. It is in particular of tapered shape as well as the tail of the rollers. Finally, the adhesive deposit is parallel to the non-longitudinal edge of the tail portion of the rollers. The invention will now be described in more detail with reference to the accompanying drawings in which:
- la figure 1 représente un rouleau sans mandrin de l'art antérieur dont le trou central est réduit, - la figure 2 représente un rouleau de l'invention avec une amorce de dévidage central faisant saillie le long de l'axe par rapport à un des flancs du rouleau, - les figures 3 à 5 représentent schématiquement, en vue de profil, la progression d'une feuille dans une machine permettant de réaliser les rouleaux sans mandrin avec amorce de dévidage, - la figure 6 représente la machine selon la figure 4, vue de dessus, - les figures 7 à 10 représentent schématiquement une machine dans les différentes phases du procédé selon l'invention, - la figure 11 représente la machine dans la configuration de la figure 9, vue de dessus, - la figure 12 représente un rouleau obtenu selon le procédé de l'invention. Le rouleau représenté sur la figure 1 , est par exemple un rouleau (R) de papier absorbant sans mandrin que l'on utilise pour l'essuyage ; soit à la maison, soit dans un atelier. A titre d'illustration, le papier est par exemple une ouate de cellulose à deux plis de 20 g/m2 chacun, preférentiellement associés. Le rouleau a été obtenu par enroulement d'une large feuille de 2600 mm de laize, sur un support de bobinage en forme de broche par exemple à section circulaire de diamètre de 10 à 80 mm. Après formation d'un rouleau, désigné « log » dans le domaine, de 20 cm de diamètre par exemple, on en extrait la broche et on le conduit à une station de sciage. Les rouleaux ainsi réalisés sont ensuite conditionnés pour l'expédition. On a représenté le rouleau après que les parois du trou central se sont effondrées dans la direction centrale. Le trou (T) est réduit jusqu'à se retrouver complètement aplati. Lors de la mise en service du rouleau dans un distributeur à dévidage central, on doit libérer l'extrémité interne de la feuille et la glisser dans l'orifice de distribution. On comprend que cette opération soit malaisée dans ce cas, car on doit tirer sur les premières spires pour dégager cette extrémité. Il en résulte inévitablement des déchets. La figure 2 montre un rouleau (10') sans mandrin résultant du procédé de l'invention ou tel que décrit dans la demande de brevet PCT/FR03/01776. Le trou central est réduit comme dans le cas précédent de l'art antérieur. Cependant la mise en service du rouleau est largement facilitée par la solution de l'invention qui a consisté à former une amorce (10B) de dévidage central. Cette amorce est, selon le mode de réalisation le plus simple, constituée par une portion de l'extrémité interne de la feuille formant le rouleau que l'on a au préalable, avant tout affaissement des parois du trou central, libérée, et mise en saillie par rapport à l'un des flancs du rouleau. On peut former cette amorce, soit au moment de la formation du rouleau juste avant ou pendant l'enroulement de la feuille, soit après réalisation du rouleau quand le trou est encore formé, c'est à dire juste après la coupe, en tout état de cause, de préférence peu de temps après, comme cela est décrit dans la demande PCT/FR03/01776. Avantageusement, cette amorce (10B), de 0,3 à 20 cm de long et de préférence de 1 cm à 15 cm, est formée d'une portion de l'extrémité interne de la feuille, que l'on a rabattue dans la direction de l'axe de bobinage du rouleau et fait déborder par rapport au flanc. Cette amorce forme ainsi un moyen de préhension en pointe qui est souple à son extrémité et que l'on peut aisément rabattre contre le flanc du rouleau, pour procéder au conditionnement desdits rouleaux avant transport. En outre la pointe est maniable et peut être introduite aisément dans un distributeur. La longueur de l'amorce est choisie en particulier pour la facilité avec laquelle elle peut être saisie et avec laquelle elle peut être introduite dans l'orifice d'extraction d'un distributeur. La longueur de l'amorce correspond à la distance entre l'extrémité de l'amorce et le flanc du rouleau. L'amorce peut être renforcée par un élément complémentaire, coloration par exemple. Selon un mode de réalisation non représenté, l'amorce peut être renforcée mécaniquement par une languette, ou tout moyen approprié, ou élément supplémentaire rapporté sur la feuille et agencé pour être en saillie sur l'axe du rouleau. L'élément rajouté est alors disposé sur l'extrémité de la feuille avant bobinage ou après séparation des rouleaux, en saillie sur l'un des flancs du rouleau. Un mode de fabrication des rouleaux selon la demande PCT/FR03/01776 est décrit ci-après en référence aux figures 3 à 6 qui représentent les éléments essentiels d'une machine d'enroulement de rouleaux. Avec cette machine, on découpe en ligne une large feuille 1 issue d'une bobine mère (3), avant enroulement sur une broche (11). La largeur de la feuille dans le domaine des produits en papier absorbant est par exemple de 2600 mm. La feuille est coupée dans le sens longitudinal de défilement au moyen de lames 5 disposées en parallèle, en une pluralité de feuilles individuelles (10) dont la largeur correspond à la largeur des rouleaux individuels que l'on souhaite obtenir. Le moyen de coupe peut être constitué d'une série de lames disposées verticalement ou bien des disques coopérant avec un cylindre support et coupant la feuille. D'autres moyens sont connus de l'homme du métier. Les feuilles (10) sont entraînées vers un dispositif comportant deux cylindres (7 et 9) parallèles et entraînés en rotation par des moyens moteurs non représentés. Les deux cylindres sont légèrement espacés l'un de l'autre. Une fois les feuilles (10) dans la position de la figure 3, on amène en place une broche (11 ) formant support de bobinage par des moyens appropriés. La broche vient pincer la feuille contre les cylindres (7 et 9), comme on le voit sur la figure 4. Elle chevauche l'espace ménagé entre ces deux cylindres d'entraînement contigus. La broche délimite ainsi d'un côté une portion d'extrémité (10A) des feuilles (10). Pour amorcer l'enroulement des feuilles sur la broche, on prévoit un moyen (15) qui rabat la portion d'extrémité (10A) sur la broche (11 ). Ce moyen peut être constitué par un ou plusieurs jets d'air judicieusement orientés. Puis, un rouleau presseur (13) est descendu pour venir maintenir l'extrémité (10A) des feuilles contre la broche. Une fois les différents organes en position, on entraîne les cylindres (7 et 9) en rotation. Ceux-ci font tourner la broche et le rouleau 13 sur eux-mêmes permettant l'enroulement de la feuille comme on le voit sur la figure 5. Lorsque l'étape d'enroulement est terminée, on relève le rouleau presseur et on déplace la broche avec ses rouleaux (10') jusqu'à la station suivante où on coupe les feuilles individuelles, parallèlement à l'axe de bobinage, sur toute la largeur de la feuille mère, en aval des cylindres (7 et 9). Puis, on extrait la broche de l'ensemble formé par les rouleaux (10'). Pour réaliser une amorce au moment de l'enroulement des feuilles. On voit sur la figure 6, qui est une vue de dessus de l'installation correspondant à la vue de la figure 4, la broche (11) posée sur les deux cylindres (7 et 9) et pinçant la feuille. Les feuilles (10-ι, 102,...) sont disposées en dessous de la broche (11 ) et leurs portions d'extrémité (10Aι, IOA2, ...) rabattues transversalement sur celle-ci. Les moyens (15), ici constitués de jets d'air, sont inclinés sur l'axe de rotation de la broche de manière à imprimer à ces portions d'extrémité un mouvement de déplacement transversal par rapport à la direction de déplacement des feuilles. Ces portions d'extrémité (10Aι, IOA2, ...), se trouvent ainsi déplacées dans la direction de l'axe de bobinage. Ainsi, chaque portion d'extrémité, (10A-ι) par exemple, vient déborder sur le côté en direction de la feuille voisine, (10A2). Une fois qu'elles sont dans cette position, le rouleau presseur (13) immobilise les différentes portions (10Aι, 10A2, ...) d'extrémité contre la broche (11). L'enroulement peut commencer. Lors de l'enroulement, la partie débordante (10Bι, IOB2, ...), de la portion d'extrémité de chacune des feuilles se retrouve pincée entre la broche et la première spire du rouleau voisin. La partie débordante se trouve libérée au moment où l'on retire la broche. Cette partie (10B-I, 10B2, ...), constitue alors l'amorce de dévidage central pour le rouleau. On décrit maintenant le procédé conforme à la présente invention en référence aux figures 7 à 10 qui en montrent les étapes successives. On reprend pour les mêmes éléments, les mêmes références additionnées de 100. La figure 7 montre ici quatre rouleaux (110') en cours de formation par enroulement de feuilles (1101 à 1104). Le nombre de rouleaux peut être différent. Les feuilles sont découpées dans une large feuille (110) selon la direction de défilement (MD) de celle-ci par des moyens de coupes schématisées par des disques (105). Ils sont montés sur une broche ou support de bobinage (111) qui est entraîné en rotation dans le sens de la flèche par les deux cylindres (107 et 109) sur lesquels ils reposent. Les cylindres (107 et 109) sont eux-mêmes entraînés en rotation par des moyens moteurs non représentés. Un cylindre presseur (113) assure la cohésion de l'ensemble. Sur les figures 8A et 8B, l'enroulement des rouleaux est terminé ; on a déplacé l'ensemble avec la broche sur une première distance (L3) déterminée dans le sens du défilement (MD) mentionné ci-dessus, en laissant les feuilles se dérouler. On a posé les rouleaux avec la broche sur des supports (107' et 109'). Les supports (107' et 109') sont de préférence parallèles aux cylindres (107 et 109). On entraîne la broche en rotation une fraction de tour, en sens inverse par rapport au sens de bobinage initial, dans le sens de la flèche de la figure 8B pour former une boucle par déroulement d'une quantité donnée de feuille. Sur les figures 9 et 11 , on voit un vérin (120) qui déplace la broche (111 ) munie des rouleaux, de préférence parallèlement selon la direction de son axe, sur une deuxième distance déterminée (L2) dans le sens de la flèche (CD). Les bords longitudinaux des feuilles font maintenant un angle (α) par rapport à la direction initiale de défilement (MD). On observe sur la figure que le décalage angulaire se produit à partir des couteaux (105) de coupe longitudinale de la feuille (110) qui se trouvent en amont des cylindres (107 et 109). Ce décalage angulaire se fait preférentiellement dans le même plan que celui du défilement. Cependant, au lieu de réaliser le déplacement selon deux directions perpendiculaires, on peut effectuer celui-ci selon une trajectoire adaptée ayant au moins des composantes dans les directions (MD) et (CD) On dépose une nouvelle broche (111 ') sur les feuilles au niveau des cylindres (107 et 109). Les feuilles sont ainsi pincées entre la broche (111 ') et ces cylindres. Puis, on dépose de la colle le long d'une ligne transversale référencée AA, de préférence parallèlement aux cylindres (107 et 109) qui supportent le bobinage des rouleaux, et on coupe transversalement l'ensemble des feuilles le long d'une ligne XX au moyen d'un couteau que l'on déplace de préférence parallèlement à l'axe de bobinage. La ligne XX est localisée entre la ligne AA et les cylindres (107 et 109), à une distance L des organes de coupe (105). Sur la figure 10, après coupe transversale des feuilles, on a déplacé la broche (111) avec ses rouleaux, à l'inverse du sens de la flèche CD, sur une distance suffisante (Sr) dans l'axe des rouleaux pour réaligner les portions de queue (110B) des feuilles dans la direction de défilement. On achève l'enroulement des rouleaux (110)' de telle manière que les extrémités terminales ou portions de queue (110B) des feuilles enduites de colle G viennent se fixer sur leur rouleau respectif, de telle sorte que les bords longitudinaux des dites portions de queue (110B) s'alignent au mieux sur ceux de leur rouleau respectif. Pour la portion de queue (110B), d'une part, et la portion d'extrémité de feuille (110A), d'autre part, on constate que les bords générés par la coupe transversale ne forment pas un angle droit avec les bords longitudinaux des feuilles (110). La portion d'extrémité (110A) qui forme l'amorce présente ainsi une forme effilée propice à une introduction facilitée dans un orifice de distribution d'un dévidoir. La portion de queue (110B) est également effilée et est caractérisée par ce procédé. Les rouleaux sont achevés. On sépare la broche des rouleaux et on libère les amorces en écartant les rouleaux les uns des autres. La machine est prête pour enrouler une nouvelle série de rouleaux. La première étape consiste alors à rabattre les portions d'extrémité (110A) sur la broche. En raison de leur inclinaison par rapport au sens de défilement de la feuille (angle α), ces portions de feuille (110A) rabattues sur la broche forment chacune une amorce et chevauchent le rouleau adjacent. Le restant des feuilles qui n'ont pas subi ce décalage latéral est enroulé en restant perpendiculaire à l'axe de la broche pour former les rouleaux. On observe que, par rapport à une installation de bobinage de rouleaux connue, il a suffi d'inclure un vérin (120) qui commande le déplacement axial de la broche sur une courte distance. De la distance de déplacement de la broche (111 ) en direction axiale dépend la longueur de l'amorce de dévidage. A titre d'exemple, on a réalisé des produits sur une machine industrielle. La disposition des différents organes représentés sur la figure 11 , qui est la vue de dessus de la machine, était la suivante : - Distance L1 entre les organes de coupe (105) et la position sur les appuis (107' et 109') : 700 mm, - Deuxième distance L2, de déplacement des rouleaux selon l'axe CD : 160 mm - Distance L de coupe selon XX : 260 mm. On obtient une longueur d'amorce C d'environ 60 mm. (C=L2xL/L1 ). La distance Sr sur laquelle on ramène la broche avec les rouleaux pour réaligner les portions de queue est donnée par la relation Sr= L2-C, soit ici 100 mm. Sur la figure 12 on a représenté un rouleau avec la dernière feuille- Figure 1 shows a roll without a mandrel of the prior art whose central hole is reduced, - Figure 2 shows a roll of the invention with a central unwinding leader projecting along the axis relative to a sides of the roll, - Figures 3 to 5 schematically show, in profile view, the progression of a sheet in a machine for making the rolls without a mandrel with wire feed, - Figure 6 shows the machine according to the figure 4, top view, - Figures 7 to 10 schematically represent a machine in the different phases of the method according to the invention, - Figure 11 shows the machine in the configuration of Figure 9, top view, - Figure 12 represents a roller obtained according to the method of the invention. The roller shown in FIG. 1 is for example a roll (R) of absorbent paper without a mandrel which is used for wiping; either at home or in a workshop. By way of illustration, the paper is for example a cellulose wadding with two plies of 20 g / m 2 each, preferably associated. The roll was obtained by winding a large sheet of 2600 mm in width, on a spindle-shaped winding support, for example with a circular section of diameter from 10 to 80 mm. After forming a roll, designated “log” in the field, of 20 cm in diameter for example, the spindle is extracted therefrom and taken to a sawing station. The rolls thus produced are then packaged for shipment. The roller is shown after the walls of the central hole have collapsed in the central direction. The hole (T) is reduced until it is completely flattened. When putting the roll into service in a center-feed dispenser, the inner end of the sheet must be released and slid into the dispensing opening. We understand that this operation is difficult in this case, because one must pull on the first turns to release this end. This inevitably results in waste. Figure 2 shows a roller (10 ') without mandrel resulting from the process of the invention or as described in patent application PCT / FR03 / 01776. The central hole is reduced as in the previous case of the prior art. However, the commissioning of the roll is greatly facilitated by the solution of the invention which consisted in forming a primer (10B) for central unwinding. This primer is, according to the simplest embodiment, constituted by a portion of the internal end of the sheet forming the roll that is previously, before any collapse of the walls of the central hole, released, and put in protrusion from one of the sides of the roller. This primer can be formed either when the roll is formed just before or during the winding of the sheet, or after the roll has been made when the hole is still formed, ie just after cutting, in any condition. preferably, soon after, as described in application PCT / FR03 / 01776. Advantageously, this primer (10B), 0.3 to 20 cm long and preferably 1 cm to 15 cm, is formed by a portion of the inner end of the sheet, which has been folded into the direction of the winding axis of the roll and overflows relative to the side. This primer thus forms a point gripping means which is flexible at its end and which can easily be folded against the side of the roller, to carry out the conditioning of said rollers before transport. In addition, the tip is handy and can be easily inserted into a dispenser. The length of the primer is chosen in particular for the ease with which it can be grasped and with which it can be introduced into the extraction orifice of a dispenser. The length of the primer corresponds to the distance between the end of the primer and the side of the roller. The primer can be reinforced with an additional element, coloring for example. According to an embodiment not shown, the primer can be reinforced mechanically by a tongue, or any suitable means, or additional element attached to the sheet and arranged to project from the axis of the roller. The added element is then placed on the end of the sheet before winding or after separation of the rollers, projecting from one of the sides of the roll. A method of manufacturing the rollers according to PCT / FR03 / 01776 is described below with reference to Figures 3 to 6 which show the essential elements of a roller winding machine. With this machine, a wide sheet 1 is cut online from a mother reel (3), before winding on a spindle (11). The width of the sheet in the field of absorbent paper products is for example 2600 mm. The sheet is cut in the longitudinal direction of travel by means of blades 5 arranged in parallel, in a plurality of individual sheets (10) whose width corresponds to the width of the individual rolls which it is desired to obtain. The cutting means may consist of a series of blades arranged vertically or else discs cooperating with a support cylinder and cutting the sheet. Other means are known to those skilled in the art. The sheets (10) are driven towards a device comprising two cylinders (7 and 9) parallel and driven in rotation by motor means not shown. The two cylinders are slightly spaced from each other. Once the sheets (10) in the position of FIG. 3, a spindle (11) forming the winding support is brought into place by suitable means. The pin pinches the sheet against the cylinders (7 and 9), as can be seen in FIG. 4. It overlaps the space formed between these two contiguous drive cylinders. The spindle thus delimits on one side an end portion (10A) of the sheets (10). To initiate the winding of the sheets on the spindle, means (15) are provided which fold the end portion (10A) over the spindle (11). This means can consist of one or more judiciously oriented air jets. Then, a pressure roller (13) is lowered to hold the end (10A) of the sheets against the spindle. Once the various members in position, the cylinders (7 and 9) are rotated. These rotate the spindle and the roller 13 on themselves allowing the sheet to be rolled up as seen in FIG. 5. When the winding step is completed, the pressure roller is raised and the spindle with its rollers (10 ') is moved to the next station where the individual sheets are cut, parallel to the winding axis, over all the width of the mother sheet, downstream of the cylinders (7 and 9). Then, the spindle is extracted from the assembly formed by the rollers (10 '). To make a primer when rolling up the leaves. We see in Figure 6, which is a top view of the installation corresponding to the view of Figure 4, the pin (11) placed on the two cylinders (7 and 9) and pinching the sheet. The sheets (10-ι, 10 2 , ...) are arranged below the spindle (11) and their end portions (10Aι, IOA 2 , ...) folded transversely thereon. The means (15), here constituted by air jets, are inclined on the axis of rotation of the spindle so as to impart to these end portions a movement of transverse movement relative to the direction of movement of the sheets. These end portions (10Aι, IOA2, ...) are thus displaced in the direction of the winding axis. Thus, each end portion, (10A-ι) for example, overflows on the side in the direction of the neighboring sheet, (10A 2 ). Once they are in this position, the pressure roller (13) immobilizes the different end portions (10Aι, 10A 2 , ...) against the spindle (11). Winding can begin. During winding, the projecting part (10Bι, IOB2, ...) of the end portion of each of the sheets is pinched between the spindle and the first turn of the neighboring roller. The projecting part is released when the spindle is removed. This part (10B- I , 10B 2 , ...) then constitutes the initiation of central unwinding for the roll. The process according to the present invention will now be described with reference to FIGS. 7 to 10 which show the successive stages thereof. The same references are used for the same elements, added to 100. FIG. 7 shows here four rollers (110 ′) being formed by winding sheets (1101 to 1104). The number of rollers may be different. The sheets are cut from a wide sheet (110) in the direction of travel (MD) thereof by cutting means shown schematically by discs (105). They are mounted on a spindle or winding support (111) which is rotated in the direction of the arrow by the two cylinders (107 and 109) on which they rest. The cylinders (107 and 109) are themselves rotated by motor means, not shown. A pressure cylinder (113) ensures the cohesion of the assembly. In FIGS. 8A and 8B, the winding of the rollers is finished; the assembly was moved with the spindle over a first distance (L3) determined in the direction of travel (MD) mentioned above, leaving the sheets to unwind. The rollers were placed with the spindle on supports (107 'and 109'). The supports (107 'and 109') are preferably parallel to the cylinders (107 and 109). The spindle is driven in rotation a fraction of a turn, in the opposite direction to the initial winding direction, in the direction of the arrow in FIG. 8B to form a loop by unwinding a given quantity of sheet. In FIGS. 9 and 11, we see a jack (120) which moves the spindle (111) fitted with the rollers, preferably parallel in the direction of its axis, over a second determined distance (L2) in the direction of the arrow ( CD). The longitudinal edges of the sheets now make an angle (α) relative to the initial direction of travel (MD). It can be seen in the figure that the angular offset occurs from the blades (105) for the longitudinal section of the sheet (110) which are located upstream of the cylinders (107 and 109). This angular offset is preferably done in the same plane as that of the scrolling. However, instead of carrying out the displacement in two perpendicular directions, it can be carried out according to an adapted trajectory having at least components in the directions (MD) and (CD) A new pin (111 ') is deposited on the sheets at the cylinders (107 and 109). The sheets are thus pinched between the spindle (111 ') and these cylinders. Then, glue is deposited along a transverse line referenced AA, preferably parallel to the cylinders (107 and 109) which support the winding of the rollers, and the sheets are cut transversely along a line XX by means of a knife which is preferably moved parallel to the winding axis. Line XX is located between line AA and the cylinders (107 and 109), at a distance L from the cutting members (105). In FIG. 10, after cross-section of the sheets, the spindle (111) with its rollers has been displaced, contrary to the direction of the arrow CD, over a sufficient distance (Sr) in the axis of the rollers to realign the tail portions (110B) of the leaves in the direction of travel. The winding of the rollers (110) ′ is completed in such a way that the end ends or tail portions (110B) of the sheets coated with glue G are fixed on their respective rolls, so that the longitudinal edges of said portions of tail (110B) align as best as possible on their respective roll. For the tail portion (110B), on the one hand, and the sheet end portion (110A), on the other hand, it is noted that the edges generated by the cross section do not form a right angle with the edges sheets (110). The end portion (110A) which forms the primer thus has a tapered shape conducive to easier introduction into a dispensing orifice of a reel. The tail portion (110B) is also tapered and is characterized by this method. The rolls are finished. The spindle is separated from the rollers and the primers are released by moving the rollers apart from each other. The machine is ready to take up a new set of rollers. The first step then consists in folding down the end portions (110A) on the spindle. Because of their inclination relative to the direction of travel of the sheet (angle α), these sheet portions (110A) folded over the spindle each form a primer and overlap the adjacent roller. The rest of the sheets which have not undergone this lateral offset are wound, staying perpendicular to the axis of the spindle to form the rolls. It is observed that, with respect to a known roller winding installation, it was sufficient to include a jack (120) which controls the axial movement of the spindle over a short distance. The length of the spindle (111) displacement in the axial direction depends on the length of the wire feeder. By way of example, products have been produced on an industrial machine. The arrangement of the various members shown in FIG. 11, which is the top view of the machine, was as follows: - Distance L1 between the cutting members (105) and the position on the supports (107 'and 109'): 700 mm, - Second distance L2, of movement of the rollers along the CD axis: 160 mm - Distance L of cutting along XX: 260 mm. A primer length C of about 60 mm is obtained. (C = L2xL / L1). The distance Sr over which the spindle is brought back with the rollers to realign the tail portions is given by the relation Sr = L2-C, ie here 100 mm. In Figure 12 there is shown a roll with the last sheet
(110B) dont le bord transversal est incliné par rapport aux flancs de celui-ci d'un angle (β). On observe que lorsque la ligne de coupe XX est perpendiculaire à(110B) whose transverse edge is inclined relative to the sides thereof thereof by an angle (β). It is observed that when the section line XX is perpendicular to
MD cet angle est complémentaire à l'angle (α). Dans le présent exemple, on a un angle (β) de 77° et un angle (α) de 13°. MD this angle is complementary to the angle (α). In the present example, we have an angle (β) of 77 ° and an angle (α) of 13 °.

Claims

REVENDICATIONS
1) Procédé de fabrication d'un rouleau (110') sans mandrin composé d'une feuille (110) de matériau souple non humide tel qu'un matériau fibreux absorbant réalisé par défilement de la feuille dans une direction et son enroulement autour d'un axe de bobinage perpendiculaire à ladite direction, et comprenant une amorce de dévidage central formant une saillie le long dudit axe par rapport à au moins une partie du plan de l'un des flancs du rouleau, caractérisé par le fait qu'on réalise l'amorce en décalant avant enroulement une portion d'extrémité de la feuille (110) de manière à ce qu'un de ses bords longitudinaux formé un angle (α) non nul par rapport à ladite direction de défilement, puis on procède à l'enroulement de la feuille autour de l'axe. 2) Procédé selon la revendication précédente, dans lequel la mise en rouleau de la feuille est réalisée sur un support de bobinage (111 ). 3) Procédé selon l'une des revendications précédentes selon lequel on forme la portion d'extrémité (110A) en découpant la feuille transversalement par rapport à la direction de défilement. 4) Procédé selon l'une des revendications précédentes, avec les étapes de réalisation du rouleau par enroulement de la feuille perpendiculairement autour d'un axe de bobinage, selon lesquelles : on dispose la feuille de façon qu'elle s'étende perpendiculairement de part et d'autre de l'axe de bobinage, on découpe la feuille transversalement par rapport à la direction de défilement de manière à former une portion d'extrémité (1 10A), on rabat la portion d'extrémité (110A) de la feuille (1 10) sur l'axe de bobinage du rouleau, on maintient cette portion (1 10A) de l'extrémité de la feuille sur l'axe de bobinage (1 11 ), on met la feuille (1 10) en rotation autour de l'axe de façon à l'enrouler, caractérisé par le fait qu'avant la dite découpe transversale, on dispose une portion de la feuille (110) de façon à ce que l'un de ses bords longitudinaux forme un angle (α) non nul par rapport à la direction de défilement (MD). 5) Procédé selon l'une des revendications 1 à 4, dans lequel on découpe parallèlement à la direction de défilement une large feuille (110) de matériau souple en une pluralité de feuilles (1101 , 1102, 1103, 1104) individuelles disposées côte à côte, on déplace latéralement une portion desdites feuilles, on découpe les dites feuilles transversalement par rapport à la direction de défilement pour former des portions d'extrémité (110A), on enroule les dites feuilles autour de l'axe et, on sépare chacun des rouleaux après leur formation, libérant ainsi l'amorce de chacun des rouleaux. 6) Procédé selon la revendications 4 ou 5, dans lequel après enroulement du ou des rouleaux, on arrête la rotation de la ou des feuilles autour du dit axe, on déplace le ou les rouleaux par déroulement de feuille (1 10 ; 1 101 à 1 104) sur une première distance (L3) déterminée selon la direction de défilement (MD), on entraîne le ou les rouleaux en rotation inverse par rapport au sens de bobinage initial pour dérouler une quantité donnée de feuille, on déplace le ou les rouleaux selon la direction (CD) de leur axe sur une deuxième distance prédéterminée (L2), on découpe la ou les feuilles entre le ou les rouleaux et les cylindres (107 et 109) transversalement à ladite direction de défilement (MD). 7) Procédé selon la revendication précédente, dans lequel les déplacements et la rotation sont combinés et adaptés de manière à éviter toute casse de feuille (1 10 ; 1 101 à 1 104). 8) Procédé selon la revendication 2 ou 3, avec les étapes de réalisation du rouleau par enroulement de la feuille perpendiculairement autour d'un support de bobinage, selon lesquelles : on dispose la feuille de façon qu'elle s'étende perpendiculairement de part et d'autre du support de bobinage (1 11 ), / on découpe la feuille transversalement par rapport à la direction de défilement de manière à former une portion d'extrémité (110A), on rabat la portion d'extrémité (110A) de la feuille (110) sur le support de bobinage (111 ) du rouleau, on maintient cette portion (110A) de l'extrémité de la feuille sur le support de bobinage (111 ), on met le support de bobinage (111 ) en rotation autour de son axe de façon à enrouler la feuille (110), caractérisé par le fait qu'avant la dite découpe transversale, on dispose une portion de la feuille (110) de façon à ce que l'un de ses bords longitudinaux forme un angle (α) non nul par rapport à la direction de défilement (MD). 9) Procédé selon l'une des revendications 2, 3 et 8, dans lequel on découpe parallèlement à la direction de défilement une large feuille (1 10) de matériau souple en une pluralité de feuilles (1 101 , 1 102, 1 103, 1 104) individuelles disposées côte à côte, on déplace latéralement une portion desdites feuilles, on place le support sur les portions de feuilles, on découpe les dites feuilles transversalement par rapport à la direction de défilement pour former des portions d'extrémité (1 10A), on enroule les dites feuilles autour du support de bobinage (1 1 1 ) et, on sépare chacun des rouleaux après leur formation, libérant ainsi l'amorce. 10) Procédé selon la revendications 8 ou 9, dans lequel après enroulement du rouleau, on arrête la rotation du support de bobinage, on déplace le support par déroulement de la ou des feuilles (1 10 ; 1 101 à 1 104) sur une première distance (L3) déterminée selon à la direction de défilement (MD), on entraîne le support en rotation inverse par rapport au sens de bobinage initial pour dérouler une quantité donnée de feuille, on déplace le support selon la direction de son axe (CD) sur une deuxième distance prédéterminée (L2), on met en place sur la ou les feuilles un nouveau support (111') de bobinage, on -découpe la ou les feuilles entre la bobine et le nouveau support de bobinage transversalement à ladite direction de défilement. 11 ) Procédé selon la revendication précédente, dans lequel les déplacements et la rotation sont combinés et adaptés de manière à éviter toute casse de feuille (110 ; 1101 à 1104). 12) Procédé selon la revendication 6, 7, 10 ou 11 dans lequel le déplacement générant l'angle (α) est effectué selon une trajectoire ayant au moins des composantes dans les directions (MD et CD). 13) Procédé selon l'une des revendications 4 à 12, dans lequel, on applique de la colle sur la partie de feuille formant la queue (110B) du ou des rouleaux." 14) Procédé selon la revendication précédente dans lequel après avoir découpé les feuilles, on réaligne les bords longitudinaux de la portion de queue (110B) des rouleaux avec les bords de ces derniers. 15) Procédé selon la revendication précédente selon lequel on réalise le réalignement par déplacement sur une distance déterminée (Sr) des rouleaux ou de la portion de queue. 16) Procédé selon l'une des revendications 8 à 15 dont l'amorce est réalisée du côté opposé à celui par lequel on extrait le support afin de limiter les efforts de friction des feuilles en contact avec le support et de faciliter son extraction. 17) Rouleau obtenu selon l'une des revendications précédentes dont la longueur de l'amorce est d'au moins 0,3 cm et de préférence entre 1 et 15 cm. 18) Rouleau selon la revendication 17 dont l'amorce est de forme effilée. 19) Rouleau selon la revendication 17 ou 18 dont la portion de queue (110B) est de forme effilée. 20) Rouleau selon l'une des revendications 17 à 19 dont le dépôt de colle est parallèle au bord de la portion de queue. 1) Method for manufacturing a roll (110 ′) without mandrel composed of a sheet (110) of non-moist flexible material such as an absorbent fibrous material produced by scrolling of the sheet in one direction and its winding around a winding axis perpendicular to said direction, and comprising a central unwinding initiation projecting along said axis with respect to at least part of the plane of one of the sides of the roll, characterized in that the 'primer by shifting before winding an end portion of the sheet (110) so that one of its longitudinal edges formed a non-zero angle (α) relative to said direction of travel, then we proceed to the wrapping the sheet around the axis. 2) Method according to the preceding claim, wherein the roll-up of the sheet is carried out on a winding support (111). 3) Method according to one of the preceding claims according to which the end portion (110A) is formed by cutting the sheet transversely relative to the direction of travel. 4) Method according to one of the preceding claims, with the steps of producing the roll by winding the sheet perpendicularly around a winding axis, according to which: the sheet is arranged so that it extends perpendicularly from one side and on the other side of the winding axis, the sheet is cut transversely with respect to the direction of travel so as to form an end portion (110A), the end portion (110A) of the sheet is folded down (1 10) on the winding axis of the roll, this portion (1 10A) of the end of the sheet is maintained on the winding axis (1 11), the sheet (1 10) is rotated around of the axis so as to wind it, characterized in that before said transverse cutting, there is a portion of the sheet (110) so that one of its longitudinal edges forms a non-zero angle (α) relative to the direction of travel (MD). 5) Method according to one of claims 1 to 4, wherein is cut parallel to the running direction a large sheet (110) of flexible material into a plurality of individual sheets (1101, 1102, 1103, 1104) arranged side by side side, a portion of said sheets is moved laterally, said sheets are cut transversely to the direction of travel to form end portions (110A), said sheets are wrapped around the axis and, each is separated rollers after their formation, thus releasing the primer from each of the rollers. 6) Method according to claims 4 or 5, wherein after winding of the roller (s), the rotation of the sheet (s) around the said axis is stopped, the roller (s) is moved by sheet unwinding (1 10; 1 101 to 1 104) over a first distance (L3) determined according to the direction of travel (MD), the roller or rollers are rotated in reverse with respect to the initial winding direction to unwind a given quantity of sheet, the roller (s) is moved along the direction (CD) of their axis over a second predetermined distance (L2), the sheet or sheets are cut between the roller or rollers and the cylinders (107 and 109) transversely to said direction of travel (MD). 7) Method according to the preceding claim, wherein the displacements and the rotation are combined and adapted so as to avoid any breakage of sheet (1 10; 1 101 to 1 104). 8) Method according to claim 2 or 3, with the steps of producing the roll by winding the sheet perpendicularly around a winding support, according to which: the sheet is arranged so that it extends perpendicularly from one side and on the other side of the winding support (1 11), / the sheet is cut transversely relative to the direction of travel so as to form an end portion (110A), the end portion (110A) of the sheet (110) is folded over the winding support (111) of the roller, this portion (110A) of the end of the sheet is maintained on the winding support (111), the winding support (111) is rotated about its axis so as to wind the sheet (110), characterized in that before said transverse cutting, a portion of the sheet (110) is arranged so that one of its longitudinal edges forms a non-zero angle (α) relative to the direction of travel ( MD). 9) Method according to one of claims 2, 3 and 8, wherein a wide sheet (1 10) of flexible material is cut parallel to the direction of travel into a plurality of sheets (1 101, 1 102, 1 103, 1 104) individual arranged side by side, a portion of said sheets is moved laterally, the support is placed on the sheet portions, the said sheets are cut transversely relative to the direction of travel to form end portions (1 10A ), said sheets are wrapped around the winding support (1 1 1) and, each of the rollers is separated after their formation, thereby releasing the primer. 10) Method according to claims 8 or 9, wherein after winding the roll, the rotation of the winding support is stopped, the support is moved by unwinding the sheet or sheets (1 10; 1 101 to 1 104) on a first distance (L3) determined according to the direction of travel (MD), the support is rotated in reverse with respect to the initial winding direction to unwind a given quantity of sheet, the support is moved along the direction of its axis (CD) over a second predetermined distance (L2), a new winding support (111 ') is placed on the sheet or sheets, the sheet or sheets are cut out between the reel and the new winding support transversely to said direction of travel. 11) Method according to the preceding claim, wherein the displacements and the rotation are combined and adapted so as to avoid any breakage of the sheet (110; 1101 to 1104). 12) Method according to claim 6, 7, 10 or 11 wherein the displacement generating the angle (α) is carried out along a trajectory having at least components in the directions (MD and CD). 13) Method according to one of claims 4 to 12, wherein, adhesive is applied to the sheet portion forming the tail (110B) of the roller (s). " 14) Method according to the preceding claim in which after having cut the sheets, the longitudinal edges of the tail portion (110B) of the rollers are realigned with the edges of the latter. 15) Method according to the preceding claim according to which the realignment by displacement over a determined distance (Sr) of the rollers or of the tail portion. 16) Method according to one of claims 8 to 15, the initiation of which is carried out on the side opposite to that by which the support is extracted in order to limit the frictional forces of the sheets in contact with the support and facilitate its extraction 17) Roll obtained according to one of the preceding claims, the length of the primer of which is at least 0.3 cm and preferably between 1 and 15 cm. 18) Roller according to claim 17, the primer of which is tapered. 19) Roller according to claim 17 or 18, the tail portion (110B) of which is tapered. 20) Roller according to one of claims 17 to 19, the adhesive deposit of which is parallel to the edge of the tail portion.
EP05763745A 2004-05-10 2005-04-29 Method for making a central unwinding roll and resulting roll Active EP1747158B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0405022A FR2869891B1 (en) 2004-05-10 2004-05-10 PROCESS FOR MANUFACTURING A ROLLER WITH CENTRAL DEVIDING AND ROLL OBTAINED
PCT/FR2005/001065 WO2005120997A1 (en) 2004-05-10 2005-04-29 Method for making a central unwinding roll and resulting roll

Publications (2)

Publication Number Publication Date
EP1747158A1 true EP1747158A1 (en) 2007-01-31
EP1747158B1 EP1747158B1 (en) 2012-01-25

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EP (1) EP1747158B1 (en)
AT (1) ATE542764T1 (en)
CA (1) CA2565107C (en)
EA (1) EA008988B1 (en)
ES (1) ES2380772T3 (en)
FR (1) FR2869891B1 (en)
WO (1) WO2005120997A1 (en)

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Publication number Priority date Publication date Assignee Title
FR2886929B1 (en) * 2005-06-08 2007-09-14 Georgia Pacific France Soc En ROLL WITH MEANS FOR MAINTAINING SPIERS
EP2244621A4 (en) * 2007-12-19 2016-03-23 Sca Hygiene Prod Ab Folded perforated web
FR2955848B1 (en) * 2010-02-01 2012-03-09 Georgia Pacific France SUPPORT CHUCK FOR A SHEET PRODUCT WRAPPED AROUND THE SAME AND ROLL WITH SUCH A CHUCK
FR2963224B1 (en) * 2010-07-29 2012-08-17 Georgia Pacific France SYSTEM FOR DISTRIBUTING A TAPE OF ABSORBENT PRODUCT WRAPPED INTO A CONFORMING ROLL
CN110461293A (en) * 2017-03-10 2019-11-15 易希提卫生与保健公司 The coreless roll of absorbability web of tissue paper
US11795020B2 (en) * 2018-09-11 2023-10-24 Sanko Tekstil Isletmeleri San. Ve Tic. A.S. Method of producing a fabric roll and roll thus made

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Publication number Priority date Publication date Assignee Title
JPH01308345A (en) * 1988-06-03 1989-12-13 Ishizu Seisakusho:Kk Continuous operation type web roll manufacturing device
JPH04213541A (en) * 1990-11-09 1992-08-04 Fuji Photo Film Co Ltd Surface take-up device for web
JPH06156831A (en) * 1992-11-26 1994-06-03 Kishi Seisakusho:Kk Slit coil rewinder
JPH10139226A (en) * 1996-11-12 1998-05-26 Akira Shimizu Manufacture of coreless toilet paper roll and coreless toilet paper roll
WO2005005295A1 (en) * 2003-06-12 2005-01-20 Georgia-Pacific France Centre-feed roll and production methods thereof

Non-Patent Citations (1)

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Title
See references of WO2005120997A1 *

Also Published As

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US20070262187A1 (en) 2007-11-15
WO2005120997A1 (en) 2005-12-22
EA008988B1 (en) 2007-10-26
FR2869891A1 (en) 2005-11-11
CA2565107A1 (en) 2005-12-22
ATE542764T1 (en) 2012-02-15
CA2565107C (en) 2013-11-26
ES2380772T3 (en) 2012-05-18
EA200601866A1 (en) 2007-06-29
EP1747158B1 (en) 2012-01-25
US7878442B2 (en) 2011-02-01
FR2869891B1 (en) 2007-06-29

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