US3812598A - Apparatus for drying damp web material - Google Patents

Apparatus for drying damp web material Download PDF

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Publication number
US3812598A
US3812598A US00326427A US32642773A US3812598A US 3812598 A US3812598 A US 3812598A US 00326427 A US00326427 A US 00326427A US 32642773 A US32642773 A US 32642773A US 3812598 A US3812598 A US 3812598A
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United States
Prior art keywords
web
air
chamber
distribution chamber
auxiliary
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Expired - Lifetime
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US00326427A
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English (en)
Inventor
M Lefebvre
P Lapierre
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Omnium de Prospective Industrielle SA
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Omnium de Prospective Industrielle SA
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
    • D06B15/00—Removing liquids, gases or vapours from textile materials in association with treatment of the materials by liquids, gases or vapours
    • D06B15/09—Removing liquids, gases or vapours from textile materials in association with treatment of the materials by liquids, gases or vapours by jets of gases

Definitions

  • Apparatus for drying damp web material having a dis- ABSTRACT tribution chamber with inlet and outlet slots through which the material is moved, the chamber having means for receiving compressed gas to which the material is subjected for uniform drying.
  • the present invention relates to a device for drying a web of damp material, i.e. material loaded with liquid or steam.
  • strips or yarns for example warped yarns
  • the meaning of the word web in the following text should be defined at this stage. It refers to material which is in the form of a flexible, wide, longitudinally continuous sheet, or of an assembly of longitudinally continuous, narrow strips arranged one beside the other, or of yarns, the width, i.e. the diameter, of which is very small and which are also positioned one beside the other.
  • the present invention is intended to overcome these disadvantages and proposes an efficient apparatus which adapts to the different products to be treated and permits drying of products which are very wide and/or have irregularities.
  • the apparatus for drying a moving web of damp material includes a distribution chamber through which the web to be dried passes and which is adapted to be maintained under pressure, this chamber having means for receiving a compressed gas, for example compressed air, from a calming chamber, and an input and an output passage for the web, each passage consisting of a slot. These slots are of a length of which is substantially equal to the width of the web to be dired and preferably adjustable in order to enable the apparatus to be adapted to the various products to be treated.
  • the apparatus can also have lateral slots and possibly particular devices for controlling the width of the web.
  • the distribution chamber is defined by two elements, at least one of which is deformable and is in equilibrium under the influence of on the one hand the pressure in the distribution chamber and on the other hand of an auxiliary balancing force.
  • This force is preferably a counter-pressure applied to the mobile element, for example from an auxiliary gas flow.
  • This gas flow may be constant or otherwise and adjustable or otherwise, depending upon the required working conditions.
  • the apparatus has means for varying the auxiliary balancing force as a function of the pressure in the distribution chamber, for example gasflow transfer channels.
  • the apparatus also has means for locally varying the pressure in the distribution chamber as a function of the local conditions of the gas fed to the said distribution chamber. These means will, for example, be channels creating a charge loss between the feed chamber and the distribution chamber, the latter then having a small cross-section.
  • FIG. 1 is a schematic, perspective view with a frontal section of an apparatus in accordance with the invention
  • FIGS. 2 and 2a are detailed views showing two modifications of the form of the lips of the chamber slots
  • FlG. 3 is a cross-section of the apparatus along the line lll [ll of FIG. 1;
  • FIG. 4 is a partial section of FIG. 3 in the case of a modification
  • FIG. 5 is a particular embodiment of the apparatus of FIG. 1.
  • the apparatus includes a lower table 1 on which the web to be dried 2 slides continuously.
  • An elongate, hollow element, designated generally by 3 is arranged above web 2 and has at least one gas inlet 4, for example for compressed air.
  • the interior volume of hollow element 3 is preferably divided into two chambers 7 and 8 by a partition 5 having judiciously distributed orifices 6.
  • Chamber 7, known as the calming chamber, partition 5 and orifices 6 ensure suitable distribution of the gas in chamber 8, in such a way that the pressure prevailing in the latter is as uniform as possible.
  • element 3 could be the lower element and element 1 the upper element.
  • the lower and upper elements could be identical to element 3, with two drying gas supplies.
  • Chamber 8 known as the distribution chamber, is defined by element 3 itself and by table 1 and is thus traversed by the web to be dried 2.
  • Table l and element 3 are substantially equal in length to the width of the web to be dried.
  • the input and output passages for the web consist of elongate slots 9a and 9b, the length of which is also substantially equal to thewidth of the web.
  • the thickness of these slots is adjustable, so that the apparatus can easily be adapted to any product to be dried, whatever its thickness may be. Moreover, this facilitates starting of the equipment. In practice, this means that at least one of elements 1 and 3, or only the lips of the slots, must be mobile perpendicularly tothe plane of the web to be dried.
  • the means for effecting this adjustment in .the thickness of the slots can be various and are in any case very simple. It is not, therefore, necessary to describe them here.
  • slots can be closed at their lateral ends as shown in FIG. 4 or can, on the contrary, be open, as is the case in the embodiment shown in FIG. 3. In this case they are extended along the lateral extremities of hollow element 3 by slots extending in the direction of passage of the web and between which the lateral margins of the web can move.
  • lateral extremities can be used to control the thickness of the web to be dried.
  • at least one detector 12 of the position of the margin of the web relative to a fixed reference mark can be provided.
  • This detector, arranged adjacent to the transverseal extremity of element 3, can be of any suitable type, for example optical or mechanical. It is so constructed as to emit an output signal which controls the adjustment of a valve 13 arranged in the gas supply 4. The feed pressure of the gas can thus be controlled into chamber 8 so that transversal stretching of the web is constant.
  • FIG. 4 The arrangement shown in FIG. 4 can also be used. In this case there are no slots at the ends of element 3; on the contrary, these extremities are closed and consist, either on table 1 or on element 3, of full portions 14 forming the lateral walls of the distribution chamber and defining guides for the lateral margins of the web.
  • the distribution chamber then has a length slightly smaller than the width of the web to'be dried.
  • element 3 which includes the dryinggas supply 4 is the lower element.
  • the calming chamber 7 is connected to distribution chamber 8 by conduits 6 playing approximately the same role as the partition with orifices shown in FIG. 1.
  • the dimensions of these conduits are so determined as to cause the appearance of charge losses in the drying-gas flow and their distribution is judiciously selected for there to be a substantiallyuniform pressure in distribution chamber 8, which itself has a small cross-section.
  • Upper element 22 is mobile between stops 27 and 28 on the upper framework 29. It is made of any locally deformable material, for example a thin metal sheet. This element 22 is subjected on its lower surface 30 to the action of the pressure prevailing in distribution chamber 8.
  • this force is a counter-pressure applied to this element 22.
  • this element 22 has a deformable membrane 31 fixed tightly by any suitable means to a portion of its upper surface 32.
  • this membrane 31 is deformable, it is possible to form a chamber 33 known as the equilibrium chamber between this membrane 31 and surface 32.
  • This chamber 33 communicates with distribution chamber 8 through orifices 34, the purpose of which becomes apparent below and the dimensions, number and distribution of which are selected as a function of the operating condition of the drying apparatus.
  • Chamber 33 itself deformable, is fed with a stream of auxiliary gas, generally compressed air, the pressure and flow-rate of which are sufficiently low not to modify the action of the drying gas on the material to be treated.
  • auxiliary gas generally compressed air
  • the supply of auxiliary gas can be made at any point judiciously selected not to impede the mobility of the lamina.
  • the flow rate of this auxiliary gas can be constant or otherwise, depending upon the operating conditions. It can also be adjustable, for example as a function of certain parameters of the drying conditions.
  • the apparatus described here prevents local variation of d without however preventing general variation in this same distance d.
  • a local variation in d would be caused, for example, by bending of the fixed'element, which bending will appear all the more rapidly as the apparatus is designed to treat very wide materials.
  • a local variation in d causes a local variation in the flow-rate of the drying air.
  • the cross section of the distribution chamber is small, there follows a local variation in the drying pressure (by variation of the charge losses in conduits 6) and therefore a local variation in the pressure on the lower surface 30 of element 22.
  • the great flexibility of this element 22 enables it to be deformed locally. It thus prevents local variation in d and remains substantially parallel at all points to element 3, whatever the deformation of the latter may be. It acts to some extent as a corrector of local defects.
  • this apparatus permits general and momentary variation in the distance d'made necessary in the case of generalised defects.
  • materials having accidental extra thicknesses have often to be treated, in particular the connecting seams of pieces placed end to end.
  • the distance d must increase and therefore element 22 move very rapidly out of the way of a defect.
  • this element 22 must also return to its equilibrium position immediately after passage of a defect to prevent the formation of wide, badly dried areas behind this defect.
  • Conduits 34 which connect equilibrium chamber 33 and distribution chamber 8 enable the pressure in each of them and, therefore, the pressures balancing mobile element 22 to be compared constantly. Thus they enable practically simultaneous variation of the two equilibrium pressures.
  • inlet 4 With web 2 moving in the direction indicated by arrows A, inlet 4 is placed in communication with a compressed-gas source.
  • the gas flows through orifices 6 to distribution chamber 8 and, because of the presence of calming chamber 7, its pressure is substantially uniform in chamber 8. Acceleration of the gas is produced under the effect of expansion actually inside the web to be dried and not outside as happens when compressedair jets directed at the web are used. A first drying action is therefore obtained.
  • the gas escapes through slots 90 and 9b as well as, where applicable, through the end slots and this action completes drying.
  • the pressure at the inlet is controlled so as to obtain the best efficiency.
  • mechanical wringing out of the liquid contained in the web has been noted, favoured by the porosity of the latter, which allows vibrations to appear.
  • the gas passes through the web (which, moreover, in the zone of the input slot travels in the opposite direction to the gas current) so that the latter is not permanently applied to the lower lip of the slot.
  • a depression zone is formed due to the presence of the divergent resulting from the form of the slots; this favours evaporation of the liquid, or at least of the water which it may contain.
  • the apparatus also enables the width of the web to be controlled and thus facilitates its winding on a takeup roll or, more generally, its subsequent use.
  • Apparatus for pneumatically drying a web of porous damp material moving through said apparatus in a predetermined direction comprising first and second frame elements, said first frame element including means for providing a web engaging surface along which the web being dried moves during operation of the apparatus and said second frame element including means cooperating with said web engaging surface for forming an air distribution chamber in said apparatus through which said web moves, and an air supply chamber formed therein in communication with said air distribution chamber for uniformly supplying pressurized air from a source thereof to said distribution chamber; said frame elements being spaced from each other a predetermined distance to define therebetween inlet and outlet slots on opposite sides of said distribution chamber transversely to the direction of movement of said web through the apparatus and through which said web passes, said slots having a height dimension selected to be substantially equal to the thickness of the web being treated, whereby pressurized air supplied to said distribution chamber is forced into the web to escape from said distribution chamber through said slots, thereby to remove liquid from said web.
  • first and second frame elements include substantially superimposed spaced wall portions defining said inlet and outlet slots, at least one of said wall portions having a plurality of grooves formed therein extending transversely of the direction of travel of said web whereby transversely extending baffles are defined in said at least one wall portion.
  • first and second frame elements include opposed wall portions extending generally parallel to the path of travel of said web through the apparatus and on opposite sides thereof, said opposed wall portions being spaced from each other to define auxiliary slots in said apparatus which receive edge portions of said web and permit escape of part of the pressurized air from said distribution chamber.
  • said means providing said web engaging surface is mounted in said first frame element for movement with respect to said second frame element in a direction generally perpendicular to the plane of said surface, under the influence of the pressurized air in said distribution chamber; and means for producing an auxiliary balancing force for maintaining said web engaging surface in a predetermined balanced position with respect to said second frame element.
  • said means for producing said auxiliary balancing force includes means for regulating said force as a function of the pressure in the distribution chamber.
  • said first frame element has an auxiliary air chamber formed therein adapted to be connected to a source of pressurized air and located adjacent said means providing said web engaging surface, and on the opposite side thereof 5 from said surface, whereby the air pressure in said auxiliary chamber produces said balancing force.
  • said means providing said web engaging surface has a plurality of apertures therein providing air communication between said auxiliary chamber and said air distribution chamber whereby air in said auxiliary chamber escapes therefrom through said apertures in accordance with the air pressure in said distribution chamber, thereby to vary the pressure in said auxiliary chamber and the balancing foce produced thereby.
  • said first frame element has an auxiliary air chamber formed therein opening towards said air distribution chamber and said means providing said web engaging surface comprises a plate formed'of a flexible material movably mounted in said first frame adjacent said auxiliary air chamber for movement towards and away from said second frame element, said auxiliary air chamber being operatively connected to a source of air whereby an auxiliary balancing force is produced on said plate for maintaining said web engaging surface in a predetermined balanced position with respect to said air distribution chamber-under the influence of the air pressure in said air distribution chamber; said plate having a plurality of apertures therein providing air communication between said auxiliary chamber and said air distribution chamber whereby air in said auxiliary chamber escapes therefrom through said apertures in accordance with the air pressure in said distribution chamber, thereby to vary the pressure in said auxiliary chamber and the balancing force produced thereby.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Drying Of Solid Materials (AREA)
  • Polyurethanes Or Polyureas (AREA)
US00326427A 1972-01-26 1973-01-24 Apparatus for drying damp web material Expired - Lifetime US3812598A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR7202613A FR2169474A5 (en) 1972-01-26 1972-01-26 Textile dryer - with a compressed gas drying chamber that can be adjusted to various textile widths
FR7234900A FR2206839A6 (US06252093-20010626-C00008.png) 1972-01-26 1972-10-02

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US00326427A Expired - Lifetime US3812598A (en) 1972-01-26 1973-01-24 Apparatus for drying damp web material

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US (1) US3812598A (US06252093-20010626-C00008.png)
JP (1) JPS4887458A (US06252093-20010626-C00008.png)
AR (1) AR196902A1 (US06252093-20010626-C00008.png)
AT (1) AT321236B (US06252093-20010626-C00008.png)
BE (1) BE794244A (US06252093-20010626-C00008.png)
CA (1) CA1001405A (US06252093-20010626-C00008.png)
CH (1) CH566534A5 (US06252093-20010626-C00008.png)
DE (1) DE2303503A1 (US06252093-20010626-C00008.png)
ES (1) ES410913A1 (US06252093-20010626-C00008.png)
FR (1) FR2206839A6 (US06252093-20010626-C00008.png)
GB (1) GB1421996A (US06252093-20010626-C00008.png)
IE (1) IE37705B1 (US06252093-20010626-C00008.png)
IL (1) IL41366A (US06252093-20010626-C00008.png)
IT (1) IT983423B (US06252093-20010626-C00008.png)
LU (1) LU66903A1 (US06252093-20010626-C00008.png)
NL (1) NL7300958A (US06252093-20010626-C00008.png)
NO (1) NO134665C (US06252093-20010626-C00008.png)
OA (1) OA04327A (US06252093-20010626-C00008.png)
SE (1) SE393677B (US06252093-20010626-C00008.png)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0310900A1 (en) * 1987-10-09 1989-04-12 Roby Teknik Ab An arrangement for the sterilizing of a travelling material web
US6080279A (en) * 1996-05-14 2000-06-27 Kimberly-Clark Worldwide, Inc. Air press for dewatering a wet web
US6083346A (en) * 1996-05-14 2000-07-04 Kimberly-Clark Worldwide, Inc. Method of dewatering wet web using an integrally sealed air press
US6096169A (en) * 1996-05-14 2000-08-01 Kimberly-Clark Worldwide, Inc. Method for making cellulosic web with reduced energy input
US6149767A (en) * 1997-10-31 2000-11-21 Kimberly-Clark Worldwide, Inc. Method for making soft tissue
US6187137B1 (en) 1997-10-31 2001-02-13 Kimberly-Clark Worldwide, Inc. Method of producing low density resilient webs
US6197154B1 (en) 1997-10-31 2001-03-06 Kimberly-Clark Worldwide, Inc. Low density resilient webs and methods of making such webs
US6306257B1 (en) 1998-06-17 2001-10-23 Kimberly-Clark Worldwide, Inc. Air press for dewatering a wet web
US6318727B1 (en) 1999-11-05 2001-11-20 Kimberly-Clark Worldwide, Inc. Apparatus for maintaining a fluid seal with a moving substrate
US6579418B2 (en) 1998-08-12 2003-06-17 Kimberly-Clark Worldwide, Inc. Leakage control system for treatment of moving webs
US20080276488A1 (en) * 2007-05-07 2008-11-13 Paul Seidl Step air foil web stabilizer
CN107846969A (zh) * 2015-08-24 2018-03-27 菲利普莫里斯生产公司 用于干燥滤嘴棒的方法

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2733347C3 (de) * 1977-07-23 1980-04-03 Lindauer Dornier Gesellschaft Mbh, 8990 Lindau Anordnung zur Beaufschlagung von Warenbahnen
US4365423A (en) * 1981-03-27 1982-12-28 Eastman Kodak Company Method and apparatus for drying coated sheet material
GB2223699A (en) * 1988-08-25 1990-04-18 S G Owen An air knife

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3096161A (en) * 1957-09-16 1963-07-02 Owens Corning Fiberglass Corp Heat setting of binder of fibrous masses
US3143396A (en) * 1961-03-02 1964-08-04 Jet Stream Products Inc Pressure-actuated valve for controlling gas flow in driers
US3199224A (en) * 1962-04-03 1965-08-10 Wolverine Equipment Co Apparatus for treating continuous length webs comprising high velocity gas jets
US3230636A (en) * 1966-01-25 Heat transfer method and means
US3416237A (en) * 1965-12-23 1968-12-17 Paper Board Printing Res Ass Method and apparatus for drying flexible material such as paper and board formed from cellulosic fibrous material
US3435751A (en) * 1966-11-03 1969-04-01 Gaf Corp Photocopy developing apparatus
US3447247A (en) * 1967-12-18 1969-06-03 Beloit Corp Method and equipment for drying web material
US3524265A (en) * 1968-09-25 1970-08-18 Armco Steel Corp Means and method for strip edge control

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3230636A (en) * 1966-01-25 Heat transfer method and means
US3096161A (en) * 1957-09-16 1963-07-02 Owens Corning Fiberglass Corp Heat setting of binder of fibrous masses
US3143396A (en) * 1961-03-02 1964-08-04 Jet Stream Products Inc Pressure-actuated valve for controlling gas flow in driers
US3199224A (en) * 1962-04-03 1965-08-10 Wolverine Equipment Co Apparatus for treating continuous length webs comprising high velocity gas jets
US3416237A (en) * 1965-12-23 1968-12-17 Paper Board Printing Res Ass Method and apparatus for drying flexible material such as paper and board formed from cellulosic fibrous material
US3435751A (en) * 1966-11-03 1969-04-01 Gaf Corp Photocopy developing apparatus
US3447247A (en) * 1967-12-18 1969-06-03 Beloit Corp Method and equipment for drying web material
US3524265A (en) * 1968-09-25 1970-08-18 Armco Steel Corp Means and method for strip edge control

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU611205B2 (en) * 1987-10-09 1991-06-06 Roby Teknik Aktiebolag An arrangement for the sterilizing of a travelling material web
EP0310900A1 (en) * 1987-10-09 1989-04-12 Roby Teknik Ab An arrangement for the sterilizing of a travelling material web
US6080279A (en) * 1996-05-14 2000-06-27 Kimberly-Clark Worldwide, Inc. Air press for dewatering a wet web
US6083346A (en) * 1996-05-14 2000-07-04 Kimberly-Clark Worldwide, Inc. Method of dewatering wet web using an integrally sealed air press
US6096169A (en) * 1996-05-14 2000-08-01 Kimberly-Clark Worldwide, Inc. Method for making cellulosic web with reduced energy input
US6143135A (en) * 1996-05-14 2000-11-07 Kimberly-Clark Worldwide, Inc. Air press for dewatering a wet web
US6228220B1 (en) 1996-05-14 2001-05-08 Kimberly-Clark Worldwide, Inc. Air press method for dewatering a wet web
US6331230B1 (en) 1997-10-31 2001-12-18 Kimberly-Clark Worldwide, Inc. Method for making soft tissue
US6149767A (en) * 1997-10-31 2000-11-21 Kimberly-Clark Worldwide, Inc. Method for making soft tissue
US6187137B1 (en) 1997-10-31 2001-02-13 Kimberly-Clark Worldwide, Inc. Method of producing low density resilient webs
US6197154B1 (en) 1997-10-31 2001-03-06 Kimberly-Clark Worldwide, Inc. Low density resilient webs and methods of making such webs
US6306257B1 (en) 1998-06-17 2001-10-23 Kimberly-Clark Worldwide, Inc. Air press for dewatering a wet web
US6579418B2 (en) 1998-08-12 2003-06-17 Kimberly-Clark Worldwide, Inc. Leakage control system for treatment of moving webs
US6318727B1 (en) 1999-11-05 2001-11-20 Kimberly-Clark Worldwide, Inc. Apparatus for maintaining a fluid seal with a moving substrate
US20080276488A1 (en) * 2007-05-07 2008-11-13 Paul Seidl Step air foil web stabilizer
US8061055B2 (en) * 2007-05-07 2011-11-22 Megtec Systems, Inc. Step air foil web stabilizer
CN107846969A (zh) * 2015-08-24 2018-03-27 菲利普莫里斯生产公司 用于干燥滤嘴棒的方法
US11122834B2 (en) 2015-08-24 2021-09-21 Philip Morris Products S.A. Method for drying filter rods
US20210386113A1 (en) * 2015-08-24 2021-12-16 Philip Morris Products S.A. Method for drying filter rods
US11540559B2 (en) * 2015-08-24 2023-01-03 Philip Morris Products S.A. Method for drying filter rods

Also Published As

Publication number Publication date
FR2206839A6 (US06252093-20010626-C00008.png) 1974-06-07
NO134665B (US06252093-20010626-C00008.png) 1976-08-16
NO134665C (US06252093-20010626-C00008.png) 1976-11-24
CA1001405A (en) 1976-12-14
IL41366A0 (en) 1973-03-30
IE37705L (en) 1973-07-26
GB1421996A (en) 1976-01-21
AT321236B (de) 1975-03-25
OA04327A (fr) 1980-01-15
BE794244A (fr) 1973-05-16
IE37705B1 (en) 1977-09-28
LU66903A1 (US06252093-20010626-C00008.png) 1973-03-26
ES410913A1 (es) 1976-01-16
AR196902A1 (es) 1974-02-28
SE393677B (sv) 1977-05-16
CH566534A5 (US06252093-20010626-C00008.png) 1975-09-15
IL41366A (en) 1976-07-30
DE2303503A1 (de) 1973-08-02
JPS4887458A (US06252093-20010626-C00008.png) 1973-11-17
IT983423B (it) 1974-10-31
NL7300958A (US06252093-20010626-C00008.png) 1973-07-30

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