EP2939970B1 - Procédé pour la production de rouleaux de papier enroulé avec un mandrin d'enroulement souple avec segments de noyau - Google Patents

Procédé pour la production de rouleaux de papier enroulé avec un mandrin d'enroulement souple avec segments de noyau Download PDF

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Publication number
EP2939970B1
EP2939970B1 EP15163154.6A EP15163154A EP2939970B1 EP 2939970 B1 EP2939970 B1 EP 2939970B1 EP 15163154 A EP15163154 A EP 15163154A EP 2939970 B1 EP2939970 B1 EP 2939970B1
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EP
European Patent Office
Prior art keywords
mandrel
core segments
core
flexible
cores
Prior art date
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Application number
EP15163154.6A
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German (de)
English (en)
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EP2939970A1 (fr
Inventor
Stefano Spinelli
Michael E. Techlin
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.)
Paper Converting Machine Co Italia SpA
Original Assignee
Paper Converting Machine Co Italia SpA
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Priority to PL15163154T priority Critical patent/PL2939970T3/pl
Publication of EP2939970A1 publication Critical patent/EP2939970A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
    • B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
    • B65H75/18—Constructional details
    • B65H75/24—Constructional details adjustable in configuration, e.g. expansible
    • B65H75/242—Expansible spindles, mandrels or chucks, e.g. for securing or releasing cores, holders or packages
    • B65H75/245—Expansible spindles, mandrels or chucks, e.g. for securing or releasing cores, holders or packages by deformation of an elastic or flexible material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • 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
    • B65H19/2269—Cradle
    • 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
    • B65H19/30—Lifting, transporting, or removing the web roll; Inserting core
    • B65H19/305—Inserting core
    • 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
    • B65H2301/41484—Winding slitting slitting roll after winding, i.e. cutting log into individual rolls
    • 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
    • B65H2301/4149—Winding slitting features concerning supply of cores
    • B65H2301/41496—Winding slitting features concerning supply of cores loading pre-arranged set of cores

Definitions

  • the present invention also relates to a method for producing convolutely wound rolls of web material, such as bathroom tissue and kitchen towel, using a flexible mandrel to hold core segments. It is especially suited for use in surface (or peripheral) type rewinders. However, specific embodiments of the invention are suited for use also in turret (or central) type rewinders.
  • the cores are held in place by rigid mandrels with actuating elements.
  • the actuating elements are retracted during loading and unloading of the cores. They are engaged during conveyance and winding to hold the core segments securely in place.
  • Various types of mandrels used to hold cores or core segments during winding of web material are taught in Patents US 2,901,192 , US 2,537,492 , US 2,711,863 , US 5,372,331 , and EP 2 462 045 B1 .
  • Drawbacks of state of the art mandrels for this application include the following. These drawbacks stem from the mandrels having at least one relatively rigid portion, typically made of metallic alloy or fiber-reinforced polymer composite.
  • WO 2009/004659 A1 discloses a mandrel which is used with a plurality of tubular core segments to produce convolutely wound reels of sheet material.
  • This mandrel radially expands and contracts in operation. It is at its smaller transverse dimension when outside the core segments and immediately after being inserted into the core segments. It is expanded by air pressure after insertion into the core segments to lock them. After the reels have been formed the mandrel is contracted, while it is still inside the core segments, so it can be extracted from the core segments on which the reels were formed. It contracts after the air pressure is relieved, by the tendency of the elastic (rubber) sleeve on its exterior to return to its original, smaller size.
  • WO 00/61480 A1 discloses the same mandrel as WO 2009/004659 A1.
  • WO 2010/114452 A1 discloses a mandrel which is used with a plurality of tubular core segments to produce convolutely wound rolls of sheet material. It radially expands and contracts in operation. It is at its smaller transverse dimension when outside the core segments and immediately after being inserted into the core segments. It is expanded by air pressure after insertion into the core segments to hold them together. When it is desirable to remove it from the core segments the pressurized air inside is released so it can contract to a smaller size, while it is still inside the core segments.
  • JP H06 327584 A discloses a mandrel used with a plurality of tubular core segments to produce convolutely wound rolls of sheet material. It states that after winding the high pressure air is evacuated from an internal elastic tube. The mandrel radially expands and contracts in operation. It is at its smaller transverse dimension when outside the core segments and immediately after being inserted into the core segments. It is expanded by air pressure after insertion into the core segments to secure them. Before extraction from the core segments inside the wound log the pressurized air inside is released and its outer diameter becomes smaller than the inner diameter of the cores.
  • an object of the present invention is obviating the disadvantages stated above. More particularly, an object of the present invention is to provide a method for producing rolls of sheet material using a winding mandrel capable of holding a core or core segments securely in place that does not suffer from the drawbacks of the current art. Instead it has the following attributes.
  • a further object of the present invention is to provide a method for producing rolls of sheet material using a flexible mandrel that behaves much like the circular, tubular cardboard cores or core segments set upon it, including their radial stiffness, so it flexes with the cores, and therefore can be used in essentially the same rewinders as use cores.
  • a further object of the present invention is to provide a method for the production of rolls with core segments on a flexible mandrel in a surface winder suitable for allowing the production of a roll or unit which, when subjected to the cutting step in a shearing or sawing station, allows rolls of paper to be obtained, provided with an inner precut core to be used in dedicated container/dispenser elements.
  • a further object of the present invention is that specific embodiments of the invention are suited for use also in turret or central type rewinders.
  • a further object of the present invention is to provide a method for the production of rolls with split cores suitable for allowing an optimization and reduction of cycle times with a consequent reduction in the associated costs.
  • a further object of the invention is to make available to users a method for the production of rolls with cut cores on a flexible mandrel in a surface winder suitable for ensuring a high value of reliability in time and such that, moreover, it can be easily and economically implemented in the production plant.
  • the apparatus is illustrated for the production of core segments or split cores on a flexible mandrel in a rewinder in order to obtain rolls of sheet material.
  • a subject of the invention is a method for producing rolls of sheet material using a flexible, lightweight, low inertia mandrel that holds cores or core segments securely in place with friction.
  • the preferred mandrel is comprised of plastic material, generally tubular in shape, that is larger than the inside surface of the cores when at rest, and so is compressed radially when inside the cores, the reduction in size of the mandrel being the cause of the pressure that induces the holding friction.
  • the mandrel is flexible and compliant the assembly of mandrel and cores together retains significant radial compliance.
  • This novelty allows the assembled unit-- core or cores with mandrel inside -- to be used in machines that require compression of the cores for operation, such as modern surface winders. Further, the low mass and low inertia of the novel mandrel allow the assembled unit to be utilized at high speeds without special modifications, premature wear of machine components, or sacrificing product variety or quality. And this all is accomplished with a low cost mandrel.
  • This mandrel can be used to hold cores or core segments in new and existing rewinders that currently wind rolls of paper with cores.
  • Exemplary surface rewinders of this type are described in Patents US 6,056,229 , US 6,422,501 , US 6,497,383 , and US 7,104,494 , which issued to Paper Converting Machine Co.
  • the mandrel can also be used in other models of surface rewinders from this supplier, both continuously operating and start-stop.
  • the mandrel can also be used in surface rewinders from other suppliers, both continuously operating and start-stop, for example, and not limited to, rewinders described in Patents US 5,150,848 (Consani), US 5,979,818 (Perini), US 6,945,491 (Gambini), US 7,175,126 (Futura), US 7,175,127 (Bretting), and others.
  • the mandrel can also be used in turret rewinders or center rewinders, both continuously operating and start-stop. It is possible then to cut and load core segments outside the rewinder. Exemplary center rewinders of this type are described in Patents US 2,769,600 , US 2,995,314 , US 5,725,176 , and US RE 28,353 .
  • the mandrel can also be used in turret and center rewinders from other suppliers.
  • the actuating elements of the rigid mandrels engage the inside surface of the flexible mandrel rather than with the inside surface of the core or core segments. This engagement is necessary to support and rotationally drive the novel mandrel with cores and paper thereupon.
  • the mandrel can also be used in center-surface rewinders, both continuously operating and start-stop, for example, and not limited to, rewinders such as described in Patents US 7,942,363 and US 7,909,282 .
  • a winding mandrel having at least one relatively rigid portion may be present inside the novel mandrel to engage the inside surface of the novel mandrel, and support and rotationally drive the novel mandrel, with cores and paper thereupon.
  • the simplest approach is a tubular mandrel made of flexible and elastic material of the type described in U.S. Patent Publication No. 2014/0084102 A1 .
  • This approach is feasible, but has the following challenge relative to practical operation: the tube dimensions and core size must be precise to realize consistent holding force mandrel to mandrel, core piece to core piece, day to day, in an industrial environment. This is because the change in diameter of this type mandrel under moderate loads is small relative to the magnitude of variations typical in the tubes and cores.
  • FIGS 7 and 8 illustrate the most preferred embodiment of the novel mandrel.
  • the mandrel 30 has a substantially tubular development and has an opening 31 longitudinally developed for the entire length of the mandrel and which confers on said mandrel a "C" shape cross-section.
  • This profile tube can be withdrawn from the finished product using the same mandrel extractor as described in U.S. Patent Publication No. 2014/0084102 A1 .
  • switching between production with cores, with core segments, and with no cores is very fast and simple.
  • the mandrel has a void at its center, it can be used also in turret or central rewinders, seating on the original winding mandrels of the rewinder, as illustrated in Figures 21-23 .
  • this embodiment is low cost because its shape can be extruded and does not require follow-up cutting, forming, nor joining operations.
  • Figures 14 - 20 Alternative embodiments of the mandrel 30 are illustrated in Figures 14 - 20 . These figures are meant to be examples and not construed as limiting. Many other shapes and types may be used to accomplish this effect.
  • Fig. 14 is an end view of a generally C-shape mandrel with non-uniform wall thickness.
  • the profile in Fig. 14 has greater wall thickness 32 near the opening 31 so the mandrel can be mass balanced when compressed inside the core or cores.
  • Fig. 15 illustrates a way of removing material by providing holes 33 in a generally C-shape mandrel with uniform wall thickness to achieve mass balance when compressed inside the core or cores.
  • Figs. 16, 17, and 18 are end views of a split tubular mandrel with overlap, of a coiled tubular mandrel, and of a generally star shape mandrel, respectively.
  • the star shaped mandrel of Fig. 18 includes a plurality of flexible flutes or points which curve or spiral outwardly from a central hub.
  • tabs 34 illustrated in Figs. 20a and 20b can be added to tubes through hot working, cold working, cutting, etc. Alternatively, they could be attached to the tube by crimping, welding, heat fusing, etc. Flexible projections, such as these, from the surface of a tubular mandrel can be used to develop the pressure between mandrel and cores that induces the holding friction.
  • the flexible mandrel 30 can also have a closed circular profile as shown in Figure 19 .
  • the axial locking of the core segments on the mandrel can be realized by means of additional lock bushings inserted before the first and after the last core segments.
  • Figs. 16 and 17 could be achieved by coiling thin sheets of metal or plastic.
  • the shapes in Figs. 8 and 14 could be achieved by curving thin sheets of metal or forming thin sheets of plastic. Most of the shapes could be achieved by extruding thermoplastic polymers.
  • a mandrel with tabs as shown in Figs. 20a and 20b can be produced by cutting the tabs in the wall of a plastic tube and bending them out. Alternatively, similar tabs could be produced by mounting metal or plastic pieces to the surface of a tube.
  • the preferred mandrel material is plastic, more preferably a thermoplastic, which are characterized by relatively low elastic modulus and mass density. They also are relatively low cost and can be extruded into various shapes. Having the mandrel extruded to a shape that is similar to the shape it takes in operation, slightly larger than the inside dimension of the cores, is cost-effective and allows a simple device to be used to load cores onto the mandrel and convey extracted mandrels back to the loading station.
  • Viscoelastic materials creep under constant stress and relax under constant strain. This means a mandrel comprised of viscoelastic material subjected to a constant load will continue to deform. It means this same mandrel subjected to constant deformation will undergo a reduction in stress. It is as though the elastic modulus of the material decreases over time when loaded.
  • the mandrel inside the core or core segments is compressed a fixed amount. If the material undergoes too much stress relaxation, it will lose its friction against the cores and not hold them adequately. If the material undergoes too much creep while inside the core or core segments, it may not return to its original shape, so cannot be returned to the loading apparatus and reused.
  • thermoplastics notably high density polyethylene (HDPE) or polypropylene (PP), known for their low density, flexibility, and extreme toughness.
  • HDPE high density polyethylene
  • PP polypropylene
  • grades are inferior to rigid PVC regarding creep resistance and stress relaxation, grades with better resistance to creep and stress relaxation may perhaps be found or compounded.
  • the time the mandrel resides in the cores before use can be minimized.
  • a device can mechanically expand the mandrels back to their original size following extraction, before reuse.
  • Such an apparatus comprises a first processing station 12 and a second processing station 14 placed in line and suitable for performing the loading and the moving of a central core of a certain length (for example 280 cm) to be cut into portions or segments of core of predetermined length, for example, to 100 mm, (the segments being of equal or variable length), a coupling of the core segments with a mandrel for support of said core segments and the movement of said assembly (core segments and mandrel) to the devices arranged downstream of the apparatus 10, in particular, a rewinder with surface winding for the production of logs, a saw machine for cutting the logs into rolls, etc.
  • a core 16 typically defined by a tubular element with longitudinal development and made in cardboard or paperboard, is loaded in the first processing station 12 and moved by means of a conveyor belt 18 subtended between two opposite shoulders 19 of the support structure or frame of the first processing station 12 and driven by a conventional electric motor 17 ( Fig. 6 ), in the direction of the second processing station 14.
  • the second processing station 14 defines a station for cutting and moving of the core 16 and is provided with a rotating turret 20 with three processing positions and developed longitudinally between two opposite ends or shoulders 21 of the frame or support structure of said second station 14 (the longitudinal development of said rotating turret is chosen as a function of the length of the cores 16).
  • the turret 20 driven in rotation with respect to its longitudinal axis by means of a commonly known electric actuator or motor, comprises a first position 22 or loading position in which the core 16, coming from the first processing station 12 by means of the conveyor belt 18, is fitted on a support shaft 23 (shown in the diagram of Figure 11 ) suitable for supporting said core 16 during its movement in the second processing station 14 by means of the rotation of the turret 20 (in the direction indicated by the arrow X in Figure 5 ), a second position 24 or cutting position at which the core 16 is subjected to an action of transverse cutting (as detailed below) suitable for forming a plurality of segments or portions of core 16', and a third position 26 or position of unloading of the portions of core 16' in the direction of the first processing station 12.
  • a first position 22 or loading position in which the core 16, coming from the first processing station 12 by means of the conveyor belt 18, is fitted on a support shaft 23 (shown in the diagram of Figure 11 ) suitable for supporting said core 16 during its movement in the second
  • the second position 24 or cutting position comprises a plurality of cutting heads 25 restrained with respect to a cross member 15 fixed between the opposite shoulders 21 of the frame of the second processing station 14 and arranged parallel to, and typically, though not necessarily, equidistant one from the other; the number and the distance between the single cutting heads are selected as a function of the number and of the longitudinal extension of the portions of core which are to be made.
  • Said cutting heads 25 comprise a blade or cutting disc 25' actuated to move towards/away with respect to the central core 16 to be subjected to cutting action by means of a pneumatic drive defined, typically, by a pneumatic actuator or cylinder 27 coupled to the single cutting head 25, the cutting heads 25 co-operate with counter-heads 25" fixed to the turret 20 at the cutting position and driven in rotation in order to impose the rotation of the core 16 with respect to its axis to create a circumferential cutting of the same.
  • a pneumatic drive defined, typically, by a pneumatic actuator or cylinder 27 coupled to the single cutting head 25
  • the cutting heads 25 co-operate with counter-heads 25" fixed to the turret 20 at the cutting position and driven in rotation in order to impose the rotation of the core 16 with respect to its axis to create a circumferential cutting of the same.
  • the core 16 cut into the plurality of portions or segments of core 16' is moved in the direction of the first processing station 12 to be fitted on a mandrel 30, whose features were described previously in detail, by means of a device also detailed below with reference to its technical-functional features.
  • Said mandrel has the function of supporting and maintaining in position the core portions 16' of the core 16 during subsequent processing steps that provide, for example, for the winding of the reel of paper on said portions of cores.
  • the external diameter of said mandrel 30 is greater with respect to the internal diameter of the core 16, so that the coupling between said mandrel and the core 16 takes place through interference and, in particular, on the coupling between said mandrel 30 and said core 16 divided into the plurality of core portions 16', the radial force exerted by the elastic return of the mandrel determines an action of pressure on the internal side surface of each core portion 16' so as to prevent any possible axial displacement of the same portions of core.
  • the features of elastic return of the material constituting the mandrel and the resulting radial force exerted by the same on the core portions 16' are selected taking account of the coefficient of friction between the material of the mandrel and the core portions so as to allow, also, the extraction of said mandrel from said core portions at the end of the production cycle, for return and reuse of the mandrel.
  • the coupling between the core 16 divided into the plurality of portions of core 16' following the step of cutting carried out in the second position or cutting position 24 of the rotating turret 20 of the second processing station 14 and the elastic mandrel 30 takes place at the first processing station 12 as shown schematically in Figures 11 and 12 and detailed here below.
  • the first processing station 12 of the apparatus 10 for the production of split cores is provided with a section of coupling between the elastic mandrel 30 and the portions of core 16' of the central core 16 that comprises a conveyor 40, longitudinally placed between the opposite shoulders 19 of said first processing station 12 and parallel to the conveyor belt 18 which, as previously described, has the function of moving the still intact core 16 to the second processing station 14 for carrying out the cutting operation.
  • the conveyor 40 comprises two superimposed motorized conveyors, respectively, an upper motorized belt 40' and a lower motorized belt 40" each provided with elements or inserts in rubber 41 for the function hereinafter detailed.
  • the upper motorized belt 40' is fixed with respect to the frame of the first processing station 12, while the lower motorized belt 40" cyclically moves towards/away relative-to the upper motorized belt. It moves down and away to allow discharge of a completed mandrel and core segments assembly, and remains down to allow entry of a bare mandrel for the next loading cycle. It moves back up to cooperate with the upper motorized belt for the next loading sequence.
  • the moving of said lower conveyor belt 40" towards/away with respect to the upper conveyor belt 40' is realized by means of an articulated quadrilateral mechanism 42 ( Fig. 3 ) actuated, for example, by means of pneumatic or hydraulic actuators 44 or in accordance with another known movement mode suitable for the purpose.
  • the first processing station 12 moreover, at the conveyor 40, comprises a linear actuator 46 fixed to the frame or support structure of said first processing station, suitable for axially aligning and imposing a translation in axial direction of the mandrel 30 with respect to the core 16 divided into portions of core 16' (as detailed below).
  • the second processing station 14, at the third position 26 and in the direction of the first processing station 12 (in the vicinity of the shoulder 21 turned in the direction of the adjacent shoulder 19 of the first processing station 12) is provided with a wheel or roller motor 50 having the function of sliding the split core 16 along the support shaft 23 and of moving it in the direction of the first processing station 12.
  • the same second processing station 14, again at the third processing position 26, comprises a pusher 49, defined by a linear actuator suitable for moving in a linear axial direction the core 16 divided into portions of core 16' as hereinafter described.
  • two opposite wings 47 In an intermediate position between the conveyor 40 and the support shaft 23 on which the core portions 16' of the core 16 are fitted, are arranged two opposite wings 47, defining a funnel and having the function of defining the elements of deformation for the mandrel 30 and of access for the mounting of the core portions 16' on said same mandrel, as detailed below with reference to Figures 11A to 11C .
  • the elements or inserts in rubber 41 of the upper 40' and lower 40" conveyor belts co-operate with the motor roller 50 to embrace the core portions 16' of the core 16 and move them to fit them on the mandrel 30; in particular, the motor roller 50 moves said core portions 16' in the direction of the conveyor 40 and the rubber inserts 41 wind and embrace the portions of core 16', taking them from the shaft support 23 and fit them equidistant one from the other on the mandrel, or adjacent to each other on the mandrel, which, as previously detailed, is elastically deformed.
  • the upper 40' and lower 40" conveyors belts by means of the inserts in rubber 41 move said portions of core 16' taken from the support shaft 23, arranging them along the entire length of the same mandrel as shown schematically in Figure 9 , in the case of this illustration with uniform gaps between the core segments.
  • the linear actuator 46 imposes a linear translation of the mandrel 30 (as indicated by the arrow Z in Figure 11A ) forcing the passage thereof between the opposite wings 47 which, being arranged in a funnel, impose an elastic deformation in the radial direction of an end portion of the mandrel which takes on, consequently, a smaller external diameter with respect to the internal diameter of the portions of core 16' and, in this way, a core portion 16' placed at a vertex of the support shaft 23, through the rotation of the motor roller 50 and the action of thrust of the pusher 49, is fitted on the mandrel 30 ( Figure 11A ).
  • the linear actuator 46 carries out an end of travel action for the cores that are fitted on the mandrel by the thrust action of the pusher 49 in co-operation with the motor roller 50 and the rubber inserts 41.
  • the pusher 49 recedes (in the direction indicated by the arrow K' in Figure 11C ) and likewise the linear actuator 46 recedes (in the direction indicated by the arrow Z' in Figure 11C ) with the mandrel on which are fitted the portions of core that recedes due to the action of the rubber inserts 41 actuated by the rotation of the upper and lower conveyor belts of the conveyor 40.
  • the cores 16 coming from a core supply are moved by means of a conveyor (block 56) in the direction of the apparatus 10 where they are loaded into the first processing station 12 (block 58) and translated to the second processing station 14 where they are loaded onto the rotating turret 20 in which, as previously detailed, the cutting is performed of the core 16 into the plurality of portions of cores 16' and, subsequently, the core portions 16' of the core 16 are fitted on the mandrel 30 (block 60), at the first processing station 12 with said mandrels coming from an extraction unit (block 62) and conducted back to the apparatus 10 by means of a conveyor (block 64).
  • Assembled units defined by the portions of core 16' of the core 16 and by the mandrel 30, are conducted from the apparatus 10 by means of a conveyor (block 66) to an accumulation or storage unit (block 68) from where they are conducted in a manner known to persons skilled in the art to the rewinder for winding of logs.
  • the processing steps detailed above are carried out in masked time; in fact, while, for example, portions of cores 16' obtained from a core 16 are fitted on a mandrel 30, at the same time a further core 16 is located at the second position of the rotating turret 20 for the cutting phase and, at the same time, a new and further core is loaded from the first processing station 12 to the first processing position of the rotating turret of the second processing station.
  • the flexible mandrel 30 is extracted, as described, for example, in U.S. Patent Publication No. 2014/0084102 A1 . Subsequently this log is cut into rolls as described, for example, in EP 1669310 .
  • rolls 90 or 90' ( Figs. 10A and 10B ) are obtained, defined by sheet material 92 wound with respect to an internal core cut into two core segments 16' and 16".
  • the core segments 16' and 16" spaced apart along the axis of the roll, leaving an intermediate or central part empty, i.e., without a core segment.
  • the core segments 16 and 16' are adjacent each other.
  • Figures 21-23 illustrate a flexible mandrel 30 of the invention and core segments 16 which are supported by a relatively rigid mandrel 92 of a conventional center rewinder or turret rewinder as previously described.
  • the relatively rigid mandrel 92 supports and rotationally drives the flexible mandrel 30 and core segments 16 while a web of paper is wound over the core segments to form a roll.
  • split cores can advantageously be made, processed in a surface or central rewinder device suitable for forming rolls of paper which, once the elastic mandrel has been extracted and the log is cut into rolls, are provided with a central core formed by two portions of core separated or conveniently adjacent so as to economize the use of material and make the fall and collection of the cores at the time of exhaustion of the paper roll easier; in fact the rolls of paper are placed in appropriate containers or dispensers and, when they are exhausted, the core formed by two separate portions falls into a special collector or dispenser element, making the operations of roll replacement faster and easier.
  • a further advantage of the method of the invention is represented by the fact of allowing a reduction in waste material at the end of the production cycle, with a consequent reduction in the related costs of production.
  • a further advantage is represented by the use of a flexible mandrel on which are fitted the portions of core and which allows the moving of said portions of core for the different steps of processing avoiding the axial displacement of the same which is a potential cause of material waste at the end of the cycle.
  • the method of the invention being provided with a rotating turret, allows processing in masked time functional to a reduction in cycle times and, consequently, in the related costs.

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  • Storage Of Web-Like Or Filamentary Materials (AREA)
  • Replacement Of Web Rolls (AREA)

Claims (20)

  1. Procédé pour la production de rouleaux (90, 90') de matériau en feuille (92) avec segments de noyaux (16') sur un mandrin souple (30) dans une machine enrouleuse comprenant les étapes de :
    - fournir des noyaux tubulaires (16)
    - couper transversalement les noyaux pour former des segments de noyaux (16') ;
    - alimenter un mandrin souple et qui se conforme (30) dans les segments de noyaux (16') ;
    - coupler par interférence élastique entre ledit mandrin souple et lesdits segments de noyaux (16') pour former en ensemble dans lequel lesdits segments de noyaux (16') sont agencés sur ledit mandrin ;
    dans lequel
    le mandrin souple (30) est plus grand qu'un diamètre intérieur des segments de noyaux (16') lorsqu'au repos, de sorte que le mandrin (30) est comprimé radialement lorsqu'à l'intérieur des segments de noyaux (16'), dans lequel dans le couplage entre le mandrin (30) et les segments de noyaux (16'), la force radiale exercée par le renvoi élastique du mandrin (30) provoque de la pression contre une surface latérale intérieure des segments de noyaux (16') appropriée pour éviter les déplacements axiaux de segments de noyaux ;
    - déplacer et alimenter ledit ensemble vers une machine enrouleuse pour produire un rondin de matériau en feuille ;
    et
    - extraire le mandrin souple du rondin.
  2. Procédé selon la revendication 1, caractérisé en ce que le matériau en feuille (92) est prévu en tant qu'une pluralité de rubans en incisant une âme et les bords des rubans de l'âme s'alignent approximativement avec les extrémités des segments de noyaux.
  3. Procédé selon la revendication 1, caractérisé en ce que le matériau en feuille (92) est prévu en tant qu'une âme enroulée en un rondin de pleine largeur par-dessus les segments de noyaux.
  4. Procédé selon la revendication 1, caractérisé en ce que les segments de noyaux (16') sur le mandrin (30) sont adjacents l'un à l'autre.
  5. Procédé selon la revendication 1, caractérisé en ce que les segments de noyaux (16') sur le mandrin (30) sont espacés l'un de l'autre.
  6. Procédé selon la revendication 1, caractérisé en ce que les segments de noyaux (16') sont ajustés sur le mandrin (30) le long de tout le développement longitudinal du mandrin (30) au moyen d'un écoulement relatif des segments de noyaux coaxialement au mandrin (30) avec ledit mandrin déformé élastiquement.
  7. Procédé selon les revendications 1 ou 3, caractérisé par la découpe du rondin de matériau en feuille en rouleaux (90, 90') après l'étape d'extraction du mandrin souple (30) des segments de noyaux (16').
  8. Procédé selon la revendication 7, caractérisé en ce que la découpe du rondin de matériau en feuille (92) en rouleaux (90, 90') est effectuée en réalisant la coupe à travers des segments de noyaux (16') de telle façon que chaque rouleau ait des parties de noyau espacées l'une de l'autre.
  9. Procédé selon la revendication 1, caractérisé en ce que le mandrin (30) est formé par l'extrusion de matériau thermoplastique.
  10. Procédé selon la revendication 1, caractérisé en ce qu'après que le mandrin (30) est extrait du noyau (16'), le mandrin retourne essentiellement à sa forme d'origine.
  11. Procédé selon la revendication 1, caractérisé en ce que ledit mandrin (30) est tubulaire.
  12. Procédé selon la revendication 1, caractérisé en ce que ledit mandrin (30) est essentiellement tubulaire et est doté d'une ouverture s'étendant longitudinalement qui dote le mandrin d'une section transversale généralement en forme de C.
  13. Procédé selon la revendication 12, caractérisé en ce que la section transversale généralement en forme de C du mandrin (30) a une paroi généralement en forme de C, l'épaisseur de la paroi étant plus grande adjacente à ladite ouverture s'étendant longitudinalement.
  14. Procédé selon la revendication 1, caractérisé en ce que ledit mandrin (30) est essentiellement tubulaire et est doté d'une fente s'étendant longitudinalement qui dote une section transversale du mandrin d'une paire de parties d'extrémité, les parties d'extrémité se chevauchant.
  15. Procédé selon la revendication 1, caractérisé en ce que ledit mandrin (30) a une section transversale généralement étoilée qui est fournie par une pluralité de cannelures incurvées.
  16. Procédé selon la revendication 1, caractérisé en ce que ledit mandrin (30) est essentiellement tubulaire et formé par une feuille spiralée ayant une paire d'extrémités, la feuilles étant enroulées en spirale de sorte que les extrémités chevauchent d'autres parties de la feuille.
  17. Procédé selon la revendication 1, caractérisé en ce que ledit mandrin (30) a une paroi généralement tubulaire et une pluralité de saillies qui s'étendent vers l'extérieur à partir de la paroi et engagent les segments de noyaux.
  18. Procédé selon la revendication 1, caractérisé en ce que le mandrin (30) est formé en thermoplastique, ou en PVC rigide ou en HDPE ou en polypropylène.
  19. Procédé selon la revendication 1, caractérisé en ce que le matériau en feuille (92) est du papier hygiénique.
  20. Procédé selon la revendication 1, caractérisé en ce que le matériau en feuille (92) est de l'essuie-tout.
EP15163154.6A 2014-04-28 2015-04-10 Procédé pour la production de rouleaux de papier enroulé avec un mandrin d'enroulement souple avec segments de noyau Active EP2939970B1 (fr)

Priority Applications (1)

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PL15163154T PL2939970T3 (pl) 2014-04-28 2015-04-10 Metoda wytwarzania rolek zwiniętego papieru za pomocą elastycznego trzpienia zwijającego z segmentami rdzeniowymi

Applications Claiming Priority (1)

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US14/263,516 US20150307315A1 (en) 2014-04-28 2014-04-28 Flexible winding mandrel with core segments for producing rolls of wound paper

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EP2939970A1 EP2939970A1 (fr) 2015-11-04
EP2939970B1 true EP2939970B1 (fr) 2019-12-25

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US20150307315A1 (en) 2015-10-29
ES2774308T3 (es) 2020-07-20
EP2939970A1 (fr) 2015-11-04
PL2939970T3 (pl) 2020-06-29

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