EP1281810A2 - Vorrichtung und Verfahren zur Einstellung des Durchmesserprofils einer Kalanderrolle - Google Patents

Vorrichtung und Verfahren zur Einstellung des Durchmesserprofils einer Kalanderrolle Download PDF

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Publication number
EP1281810A2
EP1281810A2 EP02016241A EP02016241A EP1281810A2 EP 1281810 A2 EP1281810 A2 EP 1281810A2 EP 02016241 A EP02016241 A EP 02016241A EP 02016241 A EP02016241 A EP 02016241A EP 1281810 A2 EP1281810 A2 EP 1281810A2
Authority
EP
European Patent Office
Prior art keywords
air
roller
flow rate
nozzle
thickness
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
EP02016241A
Other languages
English (en)
French (fr)
Other versions
EP1281810B1 (de
EP1281810A3 (de
Inventor
Alessandro Masotti
Francesco Traficante
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.)
Electronic Systems SpA
Original Assignee
Electronic Systems 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 Electronic Systems SpA filed Critical Electronic Systems SpA
Publication of EP1281810A2 publication Critical patent/EP1281810A2/de
Publication of EP1281810A3 publication Critical patent/EP1281810A3/de
Application granted granted Critical
Publication of EP1281810B1 publication Critical patent/EP1281810B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/06—Indicating or regulating the thickness of the layer; Signal devices
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D21G1/0253—Heating or cooling the rolls; Regulating the temperature
    • D21G1/0266—Heating or cooling the rolls; Regulating the temperature using a heat-transfer fluid
    • D21G1/0273—Heating or cooling the rolls; Regulating the temperature using a heat-transfer fluid on the exterior surface of the rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings
    • D21G1/0253—Heating or cooling the rolls; Regulating the temperature
    • D21G1/0286—Regulating the axial or circumferential temperature profile of the roll

Definitions

  • the technical sector to which the invention refers to is that of devices for adjusting the diameter profile of a calender roller, better known as "calijet”.
  • systems for the production of material in film normally comprise a calendering station.
  • the thickness profile crosswise to the direction of movement of the film is ideally constant but in reality tends to be irregular due to, in particular, mechanical deformations of the calender rollers as a result of the stress as to which they are subjected and to the working tolerances of the rollers.
  • the diameter profile of at least one of the calender rollers is locally adjusted by means of thermal expansion.
  • a feedback circuit continuously measures the transverse thickness profile of the film and cools the parts of the roller where the film thickness is below the set value and, vice versa, heats the parts of the roller where the film thickness is above the set value.
  • the roller which is thermally expanded is usually made of steel, a material that has a thermal expansion coefficient of approximately 12 parts per million and is subject to a thermal range that can reach approximately 300°C.
  • a calender roller can have a diameter of 400-700 mm, can mean that it is possible to obtain local adjustment of the roller diameter in terms of several dozens of ⁇ m.
  • US-A-3,770,578 (SPURREL) describes a device provided with a series of nozzles arranged parallel to the roller axis, which can be selectively connected to a source of pressurised hot or cold air.
  • the amount of heat or cooling units released is regulated by adj sting the air flow rate of the individual nozzles.
  • SPURREL limits the heating (or cooling) effect of a nozzle by providing the simultaneous outflow of an adequate amount of cold (or hot) air from the adjacent nozzles.
  • the said device requires adequate thermal insulation for the hot air tank and is complex and costly from the construction point of view.
  • EP-B1-0 194 010 describes an adjustment device comprising a series of nozzles arranged parallel to the roller axis, connected to a single pressurised air source.
  • Suitable electrical resistances positioned at the nozzle inlets or inside the nozzles, can selectively adjust the temperature of the air jet coming out of each nozzle, while the air flow rate is reliably constant.
  • the air temperature varies between the ambient temperature and a maximum temperature of approximately 300°C.
  • the air is emitted without being heated.
  • the nozzles also deliver air to the areas of the cylinder where the film thickness profile is within the pre-set tolerances, and which therefore do not require any adjustment.
  • the said adjustment devices consequently use considerable energy consumption.
  • the aim of this invention is therefore to find a solution to the above mentioned problems.
  • the said problems are solved by means of a device which can adjust the diameter profile of a roller in accordance with the wording of claim 1 and by means of a procedure for adjusting the diameter profile of a roller in accordance with the wording of claim 5.
  • number 1 indicates, overall, a calender with an inverted L arrangement, into which a film 2 is fed.
  • Roller 3 of the calender 1 is designed to expand and contract radially due to thermal action.
  • Device 4 is provided to adjust the diameter profile of the roller 3 according to the transverse thickness profile of the film 2 coming out of the calender 1.
  • the said device 4 is provided with a number of nozzles 5, communicating with a pressurised air source 6, which direct jets of air onto the roller 3.
  • the nozzles 5 are arranged so that the air jets are directed onto adjacent sectors 31 of the roller 3 throughout its length; several nozzles can be directed at the same sector of the roller 3, in particular at the ends of the roller where natural cooling is quicker.
  • Means 7 are provided to selectively regulate the temperature of the air coming out of each nozzle and means 8 are provided to selectively regulate the air flow rate of each nozzle 5.
  • Means 9 provide an electrical signal, corresponding to the transverse thickness profile of the film 2 coming out of the calender 1, which, via a regulation and control system 10, controls the means 7 for selectively adjusting the temperature of the air coming out of each nozzle and the means 8 for selectively adjusting the air flow rate of each nozzle.
  • the device operates as follows:
  • the pressurised air source 6 comprises a stainless steel seal manifold 61, fed by a fan (not shown).
  • the manifold 61 is arranged parallel to the roller 3 and the nozzles 5 are provided on one face 611 with a half-bearing shape.
  • the depth of the air space is preferably 25-30 mm.
  • nozzles 5 can be provided on the same sector 51, in particular at the ends of the roller 3 where natural cooling of the roller occurs more rapidly.
  • the nozzles 5 are suitably arranged so that they are directed at the sectors of the roller with a width of 75 mm; assuming that the roller is 1800 mm long, then there will be at least 24 nozzles.
  • the working pressure inside the manifold 61 is substantially constant and is preferably between 15 and 20 mbars.
  • a drain valve can be provided (not shown).
  • the air inside manifold 61 is at a substantially constant temperature, preferably at ambient value.
  • the maximum flow rate of each nozzle is preferably 0.4 m 3 /min.
  • the nozzles 5 are tubular-shaped and the devices 7 for selectively adjusting the air temperature consist of electrical resistances 7 arranged inside the nozzles 5.
  • the minimum temperature of the air jet is to that of the manifold supply temperature, while the maximum temperature that can be reached is approximately 270°C, and the electrical power of the resistance of each nozzle can reach 1600 Watts.
  • the nozzles 5 are arranged inside the manifold 61 and are provided with adequate thermal insulation to prevent the resistance affecting the temperature inside the manifold.
  • the devices 8, for adjusting the air jet flow rate of the nozzles 5, consist of shutters 81, controlled by a stepper motor 82, which regulate the inlet section of each nozzle 5.

Landscapes

  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
  • Paper (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)
EP02016241A 2001-07-31 2002-07-22 Vorrichtung und Verfahren zur Einstellung des Durchmesserprofils einer Kalanderrolle Expired - Lifetime EP1281810B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2001MI001660A ITMI20011660A1 (it) 2001-07-31 2001-07-31 Dispositivo e procedimento di regolazione del profilo del diametro diun rullo di una calandra
ITMI20011660 2001-07-31

Publications (3)

Publication Number Publication Date
EP1281810A2 true EP1281810A2 (de) 2003-02-05
EP1281810A3 EP1281810A3 (de) 2004-01-02
EP1281810B1 EP1281810B1 (de) 2006-06-14

Family

ID=11448190

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02016241A Expired - Lifetime EP1281810B1 (de) 2001-07-31 2002-07-22 Vorrichtung und Verfahren zur Einstellung des Durchmesserprofils einer Kalanderrolle

Country Status (4)

Country Link
EP (1) EP1281810B1 (de)
DE (1) DE60212269T2 (de)
ES (1) ES2266355T3 (de)
IT (1) ITMI20011660A1 (de)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3770578A (en) * 1971-05-12 1973-11-06 Midland Ross Corp Method for controlling caliper

Also Published As

Publication number Publication date
EP1281810B1 (de) 2006-06-14
DE60212269D1 (de) 2006-07-27
EP1281810A3 (de) 2004-01-02
ITMI20011660A1 (it) 2003-01-31
DE60212269T2 (de) 2007-05-24
ES2266355T3 (es) 2007-03-01
ITMI20011660A0 (it) 2001-07-31

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