WO1998056702A1 - Procede et appareil pour transporter une bande - Google Patents

Procede et appareil pour transporter une bande Download PDF

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Publication number
WO1998056702A1
WO1998056702A1 PCT/EP1998/003335 EP9803335W WO9856702A1 WO 1998056702 A1 WO1998056702 A1 WO 1998056702A1 EP 9803335 W EP9803335 W EP 9803335W WO 9856702 A1 WO9856702 A1 WO 9856702A1
Authority
WO
WIPO (PCT)
Prior art keywords
web
carrier
suction
fold position
process according
Prior art date
Application number
PCT/EP1998/003335
Other languages
English (en)
Inventor
Lasse Mogensen
Original Assignee
Rockwool International A/S
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 Rockwool International A/S filed Critical Rockwool International A/S
Priority to AU86245/98A priority Critical patent/AU8624598A/en
Publication of WO1998056702A1 publication Critical patent/WO1998056702A1/fr

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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
    • B65H23/32—Arrangements for turning or reversing webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2301/00—Handling processes for sheets or webs
    • B65H2301/30—Orientation, displacement, position of the handled material
    • B65H2301/34—Modifying, selecting, changing direction of displacement
    • B65H2301/342—Modifying, selecting, changing direction of displacement with change of plane of displacement
    • B65H2301/3423—Modifying, selecting, changing direction of displacement with change of plane of displacement by travelling an angled curved path section for overturning and changing feeding direction

Definitions

  • This invention relates to processes and apparatus by which a web can be turned from a first substantially horizontal direction of travel to a second substantially horizontal direction of travel. Typically this second direction is approximately perpendicular to the first.
  • the conventional way of achieving this at present comprises feeding the web in the first direction up to an edge which extends diagonally across the direction of travel of the web and so defines a transverse fold position, folding the web downwardly and underneath this edge into the desired second direction and transporting the web away from the transverse fold position by a collecting conveyor which is travelling in the second direction.
  • the angular change in direction is twice the angle the edge makes to the first direction.
  • the second direction of travel is at 90° to the first.
  • the web is fed towards the edge by a conveyor which feeds the web in the first direction on to fixed elements such as slats or on to rollers or other moving elements which define the diagonal, transverse edge.
  • the edge is usually not a continuous smooth surface, but is instead a stepwise edge. If the elements which define the edge are designed to move with the web as it travels around the edge, they necessarily have a rather bulky configuration, due to the engineering necessarily associated with them. If the elements which define the edge are fixed, there is a risk that they will damage the web as it travels around them.
  • the apparatus When the apparatus is intended for transporting a typical light but bulky mineral web, it is necessary to have a considerable vertical drop between the first and second directions, typically about 50cm or more, to give room for the apparatus necessary for creating the turn.
  • the web is often travelling at relatively high speed as it approaches the transverse fold position and it can be difficult to encourage it to fold accurately around the edge without, on the one hand, undergoing damage or, on the other hand, necessitating complex apparatus to encourage it to fold at the desired position.
  • a process for changing the direction of travel of a web from a first substantially horizontal direction to a second substantially horizontal direction which is at an angle of 10 to 170° to the first direction comprises feeding the web in the first direction to a transverse fold position which extends across the web at an angle of 5 to 85° to the first direction, folding the web downwardly into the second direction at the transverse fold position and transporting the web away from the fold position by a collecting conveyor which is travelling in the second direction, and in this process the transverse fold position extends across the underside of a permeable carrier which travels in the first direction at substantially the same speed as the web, the web is held by suction up against the carrier as the web approaches the fold position, the suction is released at the fold position and the web is thereby allowed to fall downwardly, and the web is folded into the second direction and is transported in the second direction away from the fold position by the collecting conveyor.
  • One advantage of the invention is that the web is supported (by suction) close to the fold position while it is being carried right up to the transverse fold
  • transverse fold position is defined by the position at which suction is released, it is easily possible to move this position, for instance to adjust its angle relative to the first direction, merely by providing movable baffles or other means of providing suction selectively through the carrier.
  • the web can be fed to the underside of the carrier by any suitable means, including by being held by suction up against the underside of a conveyor as the conveyor travels towards the carrier. Generally, however, the web is fed on the upper surface of a conveyor which is travelling in the first direction to a feed position at the underside of the permeable carrier. Generally the web, after being folded down and around the transverse fold position, is collected on the upper side of the collecting conveyor, which is travelling in the second direction.
  • the first and second directions are substantially horizontal, in that they convey the web longitudinally more than vertically. If desired, either or both may be inclined to the horizontal, e.g., at an angle up to 20°.
  • suction down through the collecting conveyor In order to improve the transfer of the web from the underside of the carrier on to the upper surface of the collecting conveyor it is sometimes useful to apply suction down through the collecting conveyor. This can be applied over the entire surface of the collecting conveyor in the general region where the web moves down towards it or the suction can be applied only through a relatively limited area, for instance a zone having approximately the same configuration as, and located immediately beneath, the transverse fold position.
  • the web is held by suction as the web and carrier move to the transverse fold position and is then blown downwardly off the carrier.
  • the entire turning and folding of the web is achieved by the application of suction (up through the carrier and optionally down through the collector) , optionally by blowing air (down through the carrier) , and by the transport of the web away from the transverse fold position.
  • any bulky mechanical elements between the levels of the web feed and the collecting conveyor either on the inside or on the outside of the path of travel of the web as the web approaches the transverse fold position and folds around it and is carried away on the collecting conveyor.
  • the transverse fold position generally has the configuration of a smooth line, and generally a straight line, compared to the stepwise line which defines it in conventional apparatus. Generally it is provided by a wall or other transverse baffle which defines the edge of the area through which suction is applied selectively
  • the carrier typically travels beneath a suction duct by which suction is applied up through the carrier and this duct extends up to a transverse baffle which defines the end of the area through which suction is applied and thus defines the transverse fold position.
  • This baffle may be, for instance, a vertical wall mounted within a suction box, so as to define the end of the box. It may instead be a horizontal plate or other shield which blocks the suction to prevent it acting on the web, for instance being located between the carrier and the suction duct. The shield defines a suction-free strip or area through the carrier to provide the transverse fold position.
  • the second direction is substantially perpendicular to the first.
  • An advantage of the invention is that the angle of the baffle with respect to the first direction is adjustable between 5 and 85° so that the second direction can be at any angle between 10° (when the baffle is at 5° to the first direction) up to 170° (when the baffle is at 85° to the first direction) .
  • the baffle is at an angle of 30 to 60° (often about 45°) and the second direction is at an angle of 60 to 120° (often about 90°) to the first direction.
  • the suction duct for instance the baffle or other means for defining the transverse fold position
  • the carrier can be used selectively to turn the web either onto a collecting conveyor travelling in a second direction extending away from one side of the first direction or onto a collecting conveyor travelling in a second direction extending away from the other side of the first direction.
  • the web may selectively be fed on to the carrier with the suction box arranged to turn the web either through an angle of 10 to 170°, generally around 90°, to the first direction or to turn the web through an angle of 190 to 350°, often around 270°, to the first direction.
  • the process, and the novel apparatus are each primarily designed for turning a web of mineral fibres, preferably being an air laid web of mineral fibres.
  • the mineral fibres are often referred to as man-made vitreous fibres (MMVF) .
  • MMVF man-made vitreous fibres
  • the web is unbonded.
  • the invention is of particular value when the web is a material made by fiberising a vitreous melt by use of at least one centrifugal fiberising rotor and thereby forming a cloud of fibres, carrying the cloud of fibres by an airstream from adjacent the rotor or rotors to a permeable collector, and collecting the fibres as a web on the collector .
  • the fibres may be formed using a spinning cup which rotates about a substantially vertical axis . Melt is fed into the cup and thrown out through perforations in the wall of the cup as fibres .
  • the fibres may be attenuated by an annular air stream (often hot) and are collected downwardly onto a collector that moves beneath the cup.
  • the fibres are formed using one or more fiberising rotors which rotate about a substantially horizontal axis and the cloud of fibres is carried substantially horizontally onto a permeable collector by which the fibres are carried as a web away from the fiberising rotor or rotors .
  • the fibres may be formed using a cascade spinner comprising a first rotor onto which melt is poured and off which it is thrown centrifugally and at least one subsequent rotor onto which the melt is thrown from the preceding rotor and off which fibres are thrown, and an airstream emerges from around the individual rotors and/or around the cascade spinner and carries the resultant fibres to a moving permeable collector on which they are collected as a web.
  • the collector is usually upwardly inclined.
  • suction air which is used in the invention (to hold the web up against the carrier as it approaches the fold line) is collected and is used as part of the airstream which carries the cloud of fibres towards the collector, for instance which emerges around the rotors.
  • the suction air is reused and it is not vented direct to the atmosphere, with the associated need to provide filters to clean the air before venting.
  • a similar recycling system is also described in PCT/EP97/00965.
  • the invention is of particular value when it is used for turning a web which is to be subsequently cross lapped, or which has been cross lapped, either using a conventional cross lapping apparatus or, preferably, using apparatus as described in PCT/EP97/00965.
  • the invention can also be utilised for simultaneously turning and laminating the web.
  • two or more webs may be fed in side-by-side relationship to the underside of the carrier, and a transverse fold position is provided for each web individually, the individual fold positions being arranged one behind the other in the second direction.
  • a transverse fold position is provided for each web individually, the individual fold positions being arranged one behind the other in the second direction.
  • the invention includes the novel process and the novel apparatus for carrying out the process on MMVF webs.
  • process and apparatus are designed primarily for turning MMVF webs
  • corresponding process and apparatus can be designed for other air laid webs or sheet materials.
  • they can be designed for a web which is a paper sheet, plastic film or other sheet having structural integrity, but generally it is an air-laid non- woven web.
  • the web can be made of organic textile fibres such as cotton, cellulose, rayon, polyamide, acrylic or polyester, and thus can be, for instance, a web of the type used for the manufacture of clothing, interlinings or other organic textiles.
  • Figure 1 is a plan view from above of suitable apparatus in use
  • Figure 2 is a view in the direction II-II in Figure 1
  • Figure 3 is a view from underneath the carrier shown in Figure 1, all other parts of the apparatus being omitted
  • Figures 4 to 10 are diagrammatic illustrations of various ways of turning, and optionally sub-dividing and recombining, the web material by utilising the invention, for instance using apparatus similar to that illustrated in Figures 1 to 3.
  • a web 1 is fed in a first direction (shown by arrow FD) on the upper surface of a feed conveyor 2 to a feed position 8 on the underside 3 of a carrier 4.
  • the web is transported away from this carrier in a second direction (shown by arrow SD) on the upper surface 5 of a collecting conveyor 6.
  • the carrier 4 is a perforated mesh or other permeable band which travels over a series of suction boxes 7 which together define a suction duct which extends from the feed position 8 where the web first contacts the carrier to a transverse fold position 9.
  • This transverse fold position 9 can be defined by a plate 10 which extends between the carrier 4 and the suction boxes 7 and thereby blanks off part of the ducts.
  • Figure 4 is a flow diagram indicating the direction of movement of the web when the apparatus is arranged as shown in Figures 1 to 3.
  • the web extends across the width of the carrier from the side L (left) to the side right (R) along the first direction (FD) .
  • the fold line 9 created by the shield or other baffle 10 extends at an angle of 45° across FD and as the web drops down from the permeable carrier and around the fold line onto the collecting conveyor it therefore turns through 90° and is conveyed away from the carrier in the second direction SD, perpendicular to the first direction FD .
  • the lengthwise position of the fold line 9 along the first direction with respect to the feed position 8 can be fixed or can be adjustable.
  • Figure 5 shows the options when it is adjustable.
  • the fold line is relatively close to the feed position 8, it is at the position marked 9A and the folded web leaves the apparatus along SD1. However when the fold position is moved longitudinally away from the feed position 8, for instance by moving the plate 10, the fold position is then at the point marked 9B and the web leaves the apparatus along SD2. Thus it is possible to move the web laterally on the collecting conveyor 6 merely by longitudinal displacement of the plate 10 or other means for creating the fold line.
  • the web can be slit lengthwise along line or lines 13 as it approaches the fold line, either by being slit before it reaches the carrier 4 or while it is on the carrier 4.
  • the lengthwise slitting can slit the web into three or more strips, each usually of substantially the same width, which can be folded independently.
  • the system wherein the web is merely slit into two equal strips is illustrated in Figure 6.
  • the slit is shown by the dashed line 13 and extends through the central position of the web, marked M, and so divides the web into one part 1A which extends between the edge L and the position M and a second part IB which extends between M and R, the right- hand edge.
  • the web turned in the system of Figure 4 will maintain this variability in thickness or density across the width, but the layered web formed in the system of Figure 6 will have more uniform thickness and density. This is because the thicker or denser edge M of the strip 1A will be laid over the thinner or lighter edge R of strip IB, and the denser or thicker edge M of strip IB will be laid over the lighter or thinner edge L of the strip 1A.
  • Figure 7 demonstrates that it is easily possible for a single turning apparatus of the invention to turn the web either in one direction (shown as SD3 ) or in a very different, and generally directly opposite, direction shown as SD4.
  • the strips can be led away in directions SD3 and SD4 and then turned through 180°, for instance by passing around a roller, and led back to one another and then collected as a laminate on a collector.
  • edge M of strip 1A coincides with, and is under or over, edge M of strip IB
  • edge L of strip 1A coincides with edge R of strip IB.
  • this can be desirable, for instance when the initial web is thicker at one edge and tapers gradually across its width, since the resultant web will then be of more uniform thickness across its width.
  • the angular orientation of the fold line 9 with respect to the feed direction FD can be fixed but is usually adjustable. It can be adjusted by, for instance, merely pivoting the plate 10 in Figure 3, optionally combined with longitudinal movement as in Figure 5.
  • Figure 9 there is shown the possibility of having the fold line in positions 9K or 9J.
  • position 9K it extends at about 60° across the feed direction FD and the collecting conveyor 6 is positioned at an angle of about 120° to FD so as to carry the turned web away along the second direction SD5 at about 120° to FD .
  • the fold line is at 9J at an angle of about 30° to FD, and the collecting conveyor is arranged to carry the turned web away along SD6 at an angle of about 60° to FD .
  • the system of Figure 9 can be achieved by moving the plate 10 or by any other convenient arrangement for moving a transverse baffle which defines the end of the area through which suction is applied and thus defines the transverse fold position.
  • a shield or other baffle member instead of physically moving a shield or other baffle member, the same effect can be achieved by any other convenient arrangement of the means for applying suction.
  • the more convenient way of achieving this is to be able to operate different areas of suction boxes independent of one another so as to allow for changes in the area-wise distribution of suction through the area.
  • the suction boxes can be arranged so that either suction is applied in the area extending from line 8 to line 9K or in the area extending from line 8 to line 9J.
  • FIG. 10 Another way of varying the area-wise distribution of suction, and thus moving the line 9 is by arranging the suction duct to extend up to line 9 and moving the suction ducts as required so as to move the position of line 9.
  • the suction box is pivoted about .p.
  • the angle is 45°
  • the second direction will be as shown in Figure 4.
  • the suction duct is pivoted so that the angle is less than or greater than 45°, the orientation of the second direction will likewise be shifted.
  • the invention can be used in combination with a conventional crosslapping system or with a crosslapping system as described in PCT/EP97/00965.
  • a conventional crosslapping system or with a crosslapping system as described in PCT/EP97/00965.
  • it can be used to turn the web through approximately 90° (as is conventional) , or it can be used to make smaller adjustments in the direction of travel of the web.
  • PCT/EP97/00965 it can be desirable to adjust the angle of feed of the web to the crosslapper so that the angle of fed is exactly parallel to the desired transverse orientation of laps in the crosslapped product.
  • the web instead of feeding the web towards the crosslapper at 90° to the collection direction (the web can be fed at an angle slightly different from 90° such that the web fed is exactly parallel to all the laps (when they are all deposited as separate parallel pieces as described with reference to Figure 7, or parallel to half the laps when they are deposited as a continuous web, as described with reference to Figure 6 of PCT/EP97/00965.
  • the suction duct can be pivoted, as in Figure 10, so that the second direction from the apparatus shown in Figure 10 of this application is at the desired angle to the direction of collection of the crosslapped product.
  • the combination of the turning device of this invention and the crosslapping device of PCT/EP97/00965 means that it is extremely easy to obtain accurate and predetermined orientation of the crosslaps merely by selecting independently or in combination the orientation of the suction in the crosslapping device and the orientation of the suction in the turning device.
  • the suction boxes in the two devices can be pivoted either in synchronisation or independently or in response to each other so as to obtain the desired optimum crosslapping configuration .

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  • Nonwoven Fabrics (AREA)

Abstract

L'invention concerne une bande de fibres (2) en mouvement. Cette bande est retournée selon un angle de 10 à 170° en étant maintenue par une aspiration contre un support mobile (4) lorsqu'elle approche d'une ligne de pliure transversale (9). Au niveau de cette ligne (9), l'aspiration est relâchée et la bande est repliée vers le bas au niveau de la ligne de pliure, puis enlevée du support pour être placée sur un convoyeur (6).
PCT/EP1998/003335 1997-06-10 1998-06-02 Procede et appareil pour transporter une bande WO1998056702A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU86245/98A AU8624598A (en) 1997-06-10 1998-06-02 Process and apparatus for transporting a web

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP97304008.2 1997-06-10
EP97304008 1997-06-10

Publications (1)

Publication Number Publication Date
WO1998056702A1 true WO1998056702A1 (fr) 1998-12-17

Family

ID=8229364

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1998/003335 WO1998056702A1 (fr) 1997-06-10 1998-06-02 Procede et appareil pour transporter une bande

Country Status (2)

Country Link
AU (1) AU8624598A (fr)
WO (1) WO1998056702A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002102695A2 (fr) * 2001-06-15 2002-12-27 Koenig & Bauer Aktiengesellschaft Dispositifs pour retourner une bande
WO2005102885A1 (fr) * 2004-03-23 2005-11-03 3M Innovative Properties Company Appareil et procede d'inflechissement d'une bande
US8871298B2 (en) 2006-02-08 2014-10-28 3M Innovative Properties Company Method for manufacturing on a film substrate at a temperature above its glass transition
US10384231B2 (en) 2006-09-28 2019-08-20 3M Innovative Properties Company System and method for controlling curl in multi-layer webs

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4687125A (en) * 1984-06-19 1987-08-18 Mitsubishi Jukogyo Kabushiki Kaisha Apparatus for changing the traveling direction of a web-like material
US5316199A (en) * 1992-09-18 1994-05-31 Rockwell International Corporation Adjustable angle bar assembly for a printing press
WO1997032069A1 (fr) * 1996-02-28 1997-09-04 Rockwool International A/S Appareil et procede pour plier une bande en accordeon

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4687125A (en) * 1984-06-19 1987-08-18 Mitsubishi Jukogyo Kabushiki Kaisha Apparatus for changing the traveling direction of a web-like material
US5316199A (en) * 1992-09-18 1994-05-31 Rockwell International Corporation Adjustable angle bar assembly for a printing press
WO1997032069A1 (fr) * 1996-02-28 1997-09-04 Rockwool International A/S Appareil et procede pour plier une bande en accordeon

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002102695A2 (fr) * 2001-06-15 2002-12-27 Koenig & Bauer Aktiengesellschaft Dispositifs pour retourner une bande
WO2002102695A3 (fr) * 2001-06-15 2003-05-30 Koenig & Bauer Ag Dispositifs pour retourner une bande
WO2005102885A1 (fr) * 2004-03-23 2005-11-03 3M Innovative Properties Company Appareil et procede d'inflechissement d'une bande
JP2007530802A (ja) * 2004-03-23 2007-11-01 スリーエム イノベイティブ プロパティズ カンパニー ウェブ屈曲装置および方法
US8871298B2 (en) 2006-02-08 2014-10-28 3M Innovative Properties Company Method for manufacturing on a film substrate at a temperature above its glass transition
US10384231B2 (en) 2006-09-28 2019-08-20 3M Innovative Properties Company System and method for controlling curl in multi-layer webs

Also Published As

Publication number Publication date
AU8624598A (en) 1998-12-30

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