EP0452284A2 - Méthode et appareil pour accumuler temporairement un surplus d'une bande de papier - Google Patents

Méthode et appareil pour accumuler temporairement un surplus d'une bande de papier Download PDF

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Publication number
EP0452284A2
EP0452284A2 EP91830142A EP91830142A EP0452284A2 EP 0452284 A2 EP0452284 A2 EP 0452284A2 EP 91830142 A EP91830142 A EP 91830142A EP 91830142 A EP91830142 A EP 91830142A EP 0452284 A2 EP0452284 A2 EP 0452284A2
Authority
EP
European Patent Office
Prior art keywords
web
slide surface
excess
members
friction force
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.)
Ceased
Application number
EP91830142A
Other languages
German (de)
English (en)
Other versions
EP0452284A3 (en
Inventor
Guglielmo Biagiotti
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.)
Fabio Perini SpA
Original Assignee
Fabio Perini SpA
Perini Navi SpA
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 Fabio Perini SpA, Perini Navi SpA filed Critical Fabio Perini SpA
Publication of EP0452284A2 publication Critical patent/EP0452284A2/fr
Publication of EP0452284A3 publication Critical patent/EP0452284A3/en
Ceased legal-status Critical Current

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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
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/24—Registering, tensioning, smoothing or guiding webs longitudinally by fluid action, e.g. to retard the running web
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H16/00—Unwinding, paying-out webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H19/00—Changing the web roll
    • B65H19/22—Changing the web roll in winding mechanisms or in connection with winding operations
    • B65H19/24—Accumulating surplus delivered web while changing the web roll
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/24—Registering, tensioning, smoothing or guiding webs longitudinally by fluid action, e.g. to retard the running web
    • B65H23/245—Suction retarders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2408/00—Specific machines
    • B65H2408/20—Specific machines for handling web(s)
    • B65H2408/23—Winding machines
    • B65H2408/235—Cradles

Definitions

  • the invention refers to an apparatus for the temporary accumulation of a web of material continuously fed to means for the processing of the same web, with at least a transmission roller defining the web trajectory, and means for accumulating the excess web.
  • Apparatuses of this type are used, for example, in the paper converting machines which operate in a continuous way on a web of paper which is fed at constant speed, on which web workings are carried out which involve a temporary slowing down of the output material, with the consequent need of accumulating the excess material.
  • a rewinder for example, the web unreeled from a bobbin of large diameter is fed to the machine continuously and at constant speed to form logs or rolls of small diameter.
  • logs or rolls of small diameter When a log has been completed, it must be moved away from the winding region after the web has been torn or cut, and must be replaced with an empty core on which the winding of the successive log is to begin.
  • the web cut or tear operation gives rise to an excess of material which has to be stored up in some way so as to maintain a sufficient tension of the web to prevent the formation of creases until the web excess is subsequently recovered by the winding means.
  • a first kind of apparatuses for accumulating the web excess comprises vacuum or blowing pneumatic means.
  • the web is driven out onto a roller having a plurality of vacuum holes, so that the web adheres to the cylindrical surface of the roller.
  • the arc of adherence of the web with the roller increases when the web is made to slow down, so that the storing up takes place because of the increase in length of the web adhering to the transmission roller.
  • These devices have a disadvantage in that, as the suction takes place through a plurality of discrete holes, the subsequent detachment of the web from the recovery roller is abrupt and irregular, because the web is detached from the roller length-by-length and not in a smooth and uniform way, with a consequent sudden variation of the web tension.
  • Another kind of apparatus for the tensioning and accumulation of web is based on the use of a mechanical member, a roller or a bar, for example, on which the web being processed is driven out, and which is displaced by actuators or elastic members so as to modify the path of the web while maintaining the tension thereof substantially constant.
  • These systems have drawbacks due to the high inertia of the mobile transmission roller, which inertia makes it impossible to carry out a timely accumulation of the web.
  • the storing up takes place always with a slight delay, so that a delay always exists during which the web is not correctly tensioned.
  • the means for the accumulation of the excess material substantially comprise an element forming a slide surface for the web, and members able to generate a force of contact between the web and the slide surface.
  • the element forming the slide surface may be a steady lamina, a fixed cylinder or other equivalent element, as well as a roller rotating at a limited peripheral speed in a direction concordant with or opposite to the direction of advancement of the web.
  • This apparatus allows a timely accumulation of the excess web, which is pressed onto the slide surface by the pressure (or vacuum) generated by said members.
  • the friction force caused by the pressure between the web and the slide surface is usually balanced by the traction or pulling force exerted on the web by the web processing means located downstream the device for the accumulation of the excess web.
  • the web processing means located downstream the device for the accumulation of the excess web.
  • the friction on the web causes the latter to accumulate upstream the slide surface, thereby forming a loop which is recovered afterwards by an acceleration of the web processing means downstream said surface, or because of the elasticity of the material (paper, for example) forming the web.
  • the friction force, and thus the tension in the web may be easily adjusted according to the type of material being processed.
  • pneumatic means may be provided, such as a series of nozzles or equivalent means, located above the web so as to have the latter lying between the nozzles and the slide surface.
  • the air jet from the nozzles, which is directed towards the web, causes the web to exert a pressure force onto the element forming the slide surface, thereby inducing the necessary friction force.
  • the adjustment of the friction force may take place in a particularly simple way by acting on the pressure or on the flow rate of the air.
  • the web is pulled against the slide surface by a vacuum.
  • a vacuum may be achieved, for example, by providing a suction box closed by a perforated lamina which makes up the surface onto which the web slides. the suction through the box generates the pulling force necessary to induce a sufficient friction on the web.
  • the apparatus according to the invention may be applied to machines of various types and, in particular, to rewinding machines commonly used in the paper converting industry. Accordingly, the invention relates also to a rewinder comprising means for the continuous feeding of a web being unwound from a bobbin, winding cylinders defining a nip for the formation of a roll or log from said web, means for the insertion of a core into said nip, means for causing the breaking of the web upon completion of a roll, and for allowing the beginning of the formation of a new roll, and means for accumulating and retaining the excess of web due to a slowing down in the winding operations.
  • a rewinder, according to the invention is characterized in that said means for accumulating and retaining the excess of web comprise an element forming a slide surface for said web and members able to generate a friction force between said web and slide surface.
  • the invention further refers to a method for the recovery of an excess of web continuously fed to processing means through members which define the trajectory of said web and are able to collect an excess of web, characterized by generating an (adjustable) friction force between said web and a slide surface therefor, said surface being located upstream from said processing means and downstream from the members which define the web trajectory.
  • Figs. 1 and 2 show two possible embodiments of the apparatus according to the invention.
  • Fig. 3 shows a modified embodiment with respect to that of Fig. 1;
  • Fig. 4 shows a detail of the sliding surface.
  • Described herebelow are two embodiments of the apparatus according to the invention applied to a rewinder, but it will be appreciated that the same apparatus may be applied also to machines of different type whenever the working of a web, continuously fed at constant speed, requires the temporary accumulation of an excess of material.
  • Fig. 1 Shown in Fig. 1 is the region of introduction of the core A between two winding cylinders 201, 203 for the formation of a roll of web material N.
  • the web N is advanced by two transmission rollers 205, 207, which define the path of the web and maintain its upstream tension constant.
  • the introduction of the core A may take place, for example, by means of a pusher member generally indicated by 204.
  • the core A When it is introduced within the nip between the winding cylinders 201, 203, the core A causes the material of web N to tear between it and the roll R, thereby stopping the feeding of the web to the roll R which is being formed between the winding cylinders 201, 203 and a roll 206 borne by an arm 208, which roll forms together with the cylinders 201, 203, a winding space for the roll R.
  • a lamina 211 or other element forming a surface for the sliding of the web N is provided upstream the winding means 201, 203, which extends over the whole width of the said web.
  • the lamina is substantially flat and provided with a curved flare-shaped region 211C.
  • nozzles generate an air jet which presses the web N against the slide surface formed by the lamina 211. Between the web N and the slide surface a friction force is thus generated which retards the advancement of the web and keeps the latter in tension.
  • the friction force between the web and the slide surface of lamina 211 causes the formation of a loop or sag indicated by N′.
  • the subsequent recovery of the web takes place regularly and gradually because no detachment from the slide surface takes place and the friction force remains constant.
  • the nozzles 213 are located in front of the slide surface. However, it is also possible to dispose said nozzles slightly upstream from said surface, so that they may serve not only to create a friction force between the web and the slide surface, but also to facilitate the formation of the loop of excess web. Such embodiment is shown in Fig. 3.
  • Fig. 2 Shown in Fig. 2 is a modified embodiment with respect to Fig. 1, wherein some members have been omitted. Parts equal or corresponding to the solution of Fig. 1 are indicated with the same reference numbers.
  • This embodiment differs from the previous one in that the friction between the web N and the slide surface formed by the lamina 211 is generated by a vacuum.
  • the lamina 211 makes up, in this case, one wall of a suction box 215 connected to a suction line 217.
  • the lamina 211 is provided with a plurality of holes distributed along the whole width of the web N, through which a vacuum pulls the web N against the slide surface. Also, in this case, between the web and the slide surface, a constant friction force is generated which ensures the formation of a web loop N′ and a subsequent gradual recovery thereof.
  • the slide surface formed by the lamina 211 may have a series of ribs 301 (Fig. 4) which are inclined with respect to the web advancement direction, which ribs have the function of spreading the web N sideways--that is to say, either maintaining or recovering the transverse tension in the web, which is likely to be reduced due to the accumulation caused by said slowing down.
  • the ribs 301 which operate in practice like those of a spreader cylinder, may be provided also in case the slide surface is not made up of a lamina, but of a steady or rotating roller. The rotation of the roller may be concordant or discordant with respect to t5he web advancement direction.

Landscapes

  • Replacement Of Web Rolls (AREA)
  • Advancing Webs (AREA)
  • Basic Packing Technique (AREA)
  • Auxiliary Devices For And Details Of Packaging Control (AREA)
EP19910830142 1990-04-13 1991-04-10 Method and apparatus for temporarily accumulating an excess of a paper web Ceased EP0452284A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT936690 1990-04-13
IT9366A IT1238710B (it) 1990-04-13 1990-04-13 Metodo e dispositivo per accumulare temporaneamente un eccesso di un nastro di carta

Publications (2)

Publication Number Publication Date
EP0452284A2 true EP0452284A2 (fr) 1991-10-16
EP0452284A3 EP0452284A3 (en) 1992-12-30

Family

ID=11129061

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910830142 Ceased EP0452284A3 (en) 1990-04-13 1991-04-10 Method and apparatus for temporarily accumulating an excess of a paper web

Country Status (7)

Country Link
EP (1) EP0452284A3 (fr)
JP (1) JPH0592856A (fr)
KR (1) KR910018292A (fr)
BR (1) BR9101489A (fr)
CA (1) CA2040197A1 (fr)
IL (1) IL97786A0 (fr)
IT (1) IT1238710B (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5772149A (en) * 1996-09-18 1998-06-30 C. G. Bretting Manufacturing Company, Inc. Winding control finger surface rewinder
US5820064A (en) * 1997-03-11 1998-10-13 C.G. Bretting Manufacturing Company, Inc. Winding control finger surface rewinder with core insert finger
US6000657A (en) * 1996-09-18 1999-12-14 C.G. Bretting Manufacturing Company, Inc. Winding control finger surface rewinder with core insert finger
US7914648B2 (en) 2007-12-18 2011-03-29 The Procter & Gamble Company Device for web control having a plurality of surface features
CN104176540A (zh) * 2013-05-24 2014-12-03 佛山市宝索机械制造有限公司 具有双功能吸气式起卷机构的复卷机

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7175127B2 (en) 2002-09-27 2007-02-13 C.G. Bretting Manufacturing Company, Inc. Rewinder apparatus and method
US6877689B2 (en) 2002-09-27 2005-04-12 C.G. Bretting Mfg. Co., Inc. Rewinder apparatus and method

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1793559A (en) * 1929-03-15 1931-02-24 Champion Coated Paper Company Paper-winding apparatus
IT982117B (it) * 1973-03-02 1974-10-21 Amf Sasib Metodo e dispositivo automatico per formare riserve estemporanee di un nastro mentre questo viene alimentato ad una macchina utilizza trice ininterrottamente ed a tensio ne controllata
DE2630335B2 (de) * 1976-07-06 1978-10-05 Felix Boettcher Gmbh & Co, 5000 Koeln Breitstreckwalze
US4828195A (en) * 1988-02-29 1989-05-09 Paper Converting Machine Company Surface winder and method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5772149A (en) * 1996-09-18 1998-06-30 C. G. Bretting Manufacturing Company, Inc. Winding control finger surface rewinder
US6000657A (en) * 1996-09-18 1999-12-14 C.G. Bretting Manufacturing Company, Inc. Winding control finger surface rewinder with core insert finger
US5820064A (en) * 1997-03-11 1998-10-13 C.G. Bretting Manufacturing Company, Inc. Winding control finger surface rewinder with core insert finger
US7914648B2 (en) 2007-12-18 2011-03-29 The Procter & Gamble Company Device for web control having a plurality of surface features
CN104176540A (zh) * 2013-05-24 2014-12-03 佛山市宝索机械制造有限公司 具有双功能吸气式起卷机构的复卷机

Also Published As

Publication number Publication date
IL97786A0 (en) 1992-06-21
IT9009366A0 (it) 1990-04-13
EP0452284A3 (en) 1992-12-30
CA2040197A1 (fr) 1991-10-14
IT9009366A1 (it) 1991-10-13
KR910018292A (ko) 1991-11-30
BR9101489A (pt) 1991-12-03
IT1238710B (it) 1993-09-01
JPH0592856A (ja) 1993-04-16

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