WO2006066304A1 - Corps de contact et procede de production d'un corps de contact ignifuge - Google Patents

Corps de contact et procede de production d'un corps de contact ignifuge Download PDF

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Publication number
WO2006066304A1
WO2006066304A1 PCT/AU2004/001827 AU2004001827W WO2006066304A1 WO 2006066304 A1 WO2006066304 A1 WO 2006066304A1 AU 2004001827 W AU2004001827 W AU 2004001827W WO 2006066304 A1 WO2006066304 A1 WO 2006066304A1
Authority
WO
WIPO (PCT)
Prior art keywords
sheets
web
impregnated
fibrous material
fire proofing
Prior art date
Application number
PCT/AU2004/001827
Other languages
English (en)
Inventor
Jeremy Schreiber
Original Assignee
Munters Pty Limited
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 Munters Pty Limited filed Critical Munters Pty Limited
Priority to PCT/AU2004/001827 priority Critical patent/WO2006066304A1/fr
Publication of WO2006066304A1 publication Critical patent/WO2006066304A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
    • B29C70/28—Shaping operations therefor
    • B29C70/40—Shaping or impregnating by compression not applied
    • B29C70/50—Shaping or impregnating by compression not applied for producing articles of indefinite length, e.g. prepregs, sheet moulding compounds [SMC] or cross moulding compounds [XMC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B15/00—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00
    • B29B15/08—Pretreatment of the material to be shaped, not covered by groups B29B7/00 - B29B13/00 of reinforcements or fillers
    • B29B15/10—Coating or impregnating independently of the moulding or shaping step
    • B29B15/12—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length
    • B29B15/122—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length with a matrix in liquid form, e.g. as melt, solution or latex
    • B29B15/125—Coating or impregnating independently of the moulding or shaping step of reinforcements of indefinite length with a matrix in liquid form, e.g. as melt, solution or latex by dipping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F25/00—Component parts of trickle coolers
    • F28F25/02—Component parts of trickle coolers for distributing, circulating, and accumulating liquid
    • F28F25/08—Splashing boards or grids, e.g. for converting liquid sprays into liquid films; Elements or beds for increasing the area of the contact surface
    • F28F25/087—Vertical or inclined sheets; Supports or spacers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0012—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular thermal properties
    • B29K2995/0016—Non-flammable or resistant to heat

Definitions

  • This invention relates to the production of air and water contact bodies for cooling towers and evaporative coolers and in particular to contact bodies formed from a plurality of sheets of impregnated fibrous webbing defining a plurality of channels or conduits in said contact body through which gas and liquid passes.
  • Air and water contact bodies of the type used in cooling towers, humidifiers, evaporative coolers and the like equipment comprise interleaved corrugated layers of non-metallic materials. Corrugated sheets are placed adjacent one another with their ridges or crests contacting each other so that channels or passage ways are formed between the sheets. This provides continuously varying width passages in the sheets which result in the flow direction of the gas and liquid being repeatedly changed during passage through the body. In use water is sprayed over the contact body to effect heat and water vapour transfer between the water and the ambient air.
  • Such contact bodies are generally formed from a range of fibrous non-metallic materials including Kraft paper, fibreglass, plastics and other materials generally impregnated with a resin to improve rigidity and wet strength.
  • Gas contact bodies of this type have distinct advantages in cooling towers and evaporative cooling apparatus and are generally produced to be non-flammable. While such materials will not easily catch fire, they will ignite when subjected to a fire over a prolonged period.
  • these apparatus rely on air being withdrawn from a particular environment and cooled through evaporative contact with a cooling medium such as water. Thus there is continuously a forced draft into the evaporative cooler. If a fire breaks out near the intake of an evaporative cooler, the contact bodies will be exposed to fire for an extended period.
  • the contact bodies to be able to be fire proof to withstand contact of this nature with a fire rather than being simply fire resistant or non flammable. Summary of the invention
  • the invention provides a method of producing a fire proof sheet comprising the steps of
  • the solution comprising 5-40% by weight of an organic resin, 5-40% by weight of a fire proofing agent, and 20-80% by weight of an organic solvent,
  • the fire proofing agent is preferably a clay and more preferably an alumino silicate clay such as Kaolin.
  • the web of fibrous material is preferably a mineral glass fibre banded with a binder such as poly vinyl acetate binder.
  • the applicant has found that by increasing the solids content of the impregnating solution the solids impregnation into the web is increased.
  • the content of the resin and fireproofing agent in the dried and cured fire proof sheet is in the range of 10-25 wt% and more preferably 12-19 wt%.
  • the method prior to drying the web, further comprises the step of passing the impregnated web of fibrous material through at least a pair of squeeze rollers. This has been found to increase the solids impregnation into the fibrous material. This increased solids impregnation into the fibrous material improves the fire proofing characteristics of the impregnated fibrous web.
  • the organic resin is selected from the group of phenolic resins and melamin- formaldehyde resins and the drying step is at a temperature in excess of 100 0 C and may be in the range of 105 ° C -140 ° C. It is preferable that the step of forming the corrugated sheet is performed by a vacuuming forming operation and preferably at the drying temperature. Subjecting the wet corrugated sheet to these temperatures also enables the corrugated sheet to dry without curing the binder.
  • the curing step is preferably carried out at a temperature in excess of 120 ° C and less than 20CTC.
  • the web of impregnated fibrous material is then passed through to a second heating step where the binder solution is cured.
  • the formed cured impregnated sheet may then be shaped to produce a contact body.
  • the adhesive mixture comprising an alkaline metal silicate and a fire proofing agent
  • the fire proofing agent is an alumino silicate
  • the alumino silicate is a clay such as kaolin.
  • the alkaline metal silicate is preferably a high grade, high viscosity liquid sodium silicate which is able to absorb onto the impregnated web of bonded fibrous material.
  • the fibrous material is preferably a glass fibre veil bonded together by a suitable binder such as polyvinyl acetate.
  • the final curing step for the assembled article preferably occurs at a temperature of 250- 300 0 C to solidify the adhesive. Prior to the final cure, the front and rear edges of the assembled article may be coated with the adhesive mixture.
  • the impregnated web of fibrous material is preferably produced by the method of the first aspect of the invention.
  • the invention further provides in the third aspect an impregnated web of fibrous material comprising a bonded web of fibrous material and 10-25wt% of a resin and a fire proofing agent.
  • the resin is preferably selected from the group of a plenolic resin or a melamine- formaldeyde resin and the fireproofing agent is an alumino-silicate such as Kaolin clay.
  • the fibrous material is preferably a bonded glass fibre matting or kraft paper.
  • the fire proofing agent and binder is present in the cured impregnated web in a total amount of 12-19 wt% and preferably 14- 16 wt%.
  • the impregnated web of fibrous material is preferably produced by the method of the first aspect of the invention.
  • a contact body for use in a gas and liquid contact apparatus in which gas and liquid flow in cross flow relationship, the body comprising at least first and second sets of corrugated sheets, the sheets including a bonded web of fibrous material having impregnated therein an organic resin and a fireproofing agent.
  • the organic resin is a phenolic resin or a melamine formaldehyde resin and content of the fireproofing agent which may be an aluminosilicate such as kaolin and resin is within the range of 10-25 wt% of the total sheet, preferably 12-19 wt%.
  • the invention provides an apparatus for producing a fire proof sheet, comprising:
  • a vessel for contacting a web of fibrous material through an impregnating solution at least a pair of squeeze rollers through which the impregnated web passes,
  • an oven having a first stage for drying the impregnated web and a second stage for curing the impregnating solution on the web;
  • the shape former of this aspect of the invention is preferably a vacuum former.
  • Figure 1 is a sectional view of an evaporative cooling tower which uses contact bodies in accordance with the invention
  • Figure 2 is a perspective view of a contact body
  • Figure 3 is a schematic diagram showing the production of a contact body in accordance with the invention.
  • a cooling tower 10 includes the casing 12 in which one or more contact bodies 22 constructed in accordance with the present invention are mounted.
  • the base of casing 12 is formed into a sump 23 having a float 24 and drainage line 25.
  • Gas such as air, enters the channels or ducts within the contact bodies of the air inlet edge portion 26 thereof and is drawn upwardly within the apparatus to an outlet 29 equipped with a farm 30 and motor 31.
  • Liquid such as water is introduced into the evaporative cooling apparatus or cooling tower through a liquid supply line 27 and escapes from the line through perforations or nozzles 28.
  • the liquid escaping from the supply line 28 passes through a distribution pad 32 of conventional construction in the top of the contact bodies 22.
  • FIG. 2 shows a contact body which can be formed from the impregnated sheets in accordance with the invention.
  • the contact body comprises a plurality of corrugated sheets 33, 34, 35, 36 with the corrugations in adjacent sheets such as 33 and 34 being disposed at an angle to each other and the corrugations in alternate sheets such as 33 and 35 or 34 and 36 being disposed in parallel, whereby a plurality of crossing channels is formed within the contact body.
  • the corrugations are generally at an angle relative to the horizontal so as to permit the gravity flow of liquid there through.
  • the angle at which the adjacent corrugated sheets are disposed is not critical and as is evident from Figure 1, the angular disposition of the alternate sheets as suggested by the crossing solid and dash lines in contact bodies 11 and 22 in Figure 1 may vary from apparatus to apparatus depending on the particular construction or particular function to be performed.
  • corrugations in the corrugated sheets of contact bodies like those shown in Figure 2 are generally from 5 to 40 millimetres in height from trough to peak and are usually 10 to 30 millimetres wide.
  • the starting material for producing the impregnated matting is a fibre glass matting which is generally provided in reel form.
  • the fibre glass matting is produced by combining fine fibre glass veil and polyvinyl acetate (PVA) fibre binder and adding a PVA powder binder to the surface of the combined fibres. The matting and the binder are then cured together in an oven and stored in reel form 40.
  • PVA polyvinyl acetate
  • the bonded fibre glass matting 42 is then passed through an impregnation solution which is a combination of an organic resin which in the preferred embodiment is a phenolic resin, or melamine-formaldeyde resin or both, a fire proofing agent and a solvent.
  • an impregnation solution which is a combination of an organic resin which in the preferred embodiment is a phenolic resin, or melamine-formaldeyde resin or both, a fire proofing agent and a solvent.
  • a typical solution has the composition given below.
  • the impregnation solution has a high solids content from say 10-40% and has appropriate rheological properties to enable coverage and impregnation into the bonded matting.
  • the phenolic resin binder binds the fire proofing agent into the bonded matting.
  • Resinox® IL2132 a phenolic resin binder supplied by Orica Australia Pty Ltd, is added to a mixing vessel and water added to the mixing vessel while stirring the solution at 80 rpm for 10 minutes. Methanol is then stirred into the mixture for a further 10 minutes to maintain adequate rheological properties.
  • the fire proofing agent (Eckalite 1 ) is then added to the mixture. Once the Eckalite has been completely added to the mixture, the mixture is stirred for a further 30 minutes at 135 rpm.
  • the bonded fibre glass matting is passed through the impregnating solution to coat and impregnate the bonded fibre matting with the solution.
  • the coated matting 45 is then passed through at least one pair of squeeze rollers 46 which are a metal roller paired with a rubber roller to further impregnate the matting with the solid from the dipping solution. Due to the nature of the matting, the solid within the solution will generally not easily penetrate the matting. Hence the squeeze rollers are highly desirable to physically impregnate the solid in the dipping solution into the matting. In this way the solids content of the final cured matting can be greatly increased.
  • the excess dipping solution is then removed from the coated and impregnated matting before the matting progresses to the forming and curing stage of the process.
  • the forming and curing stage of the process comprises at least two sequential ovens which initially complete drying of the matting and then cure the phenolic resin.
  • the impregnated sheeting is transported by conveyor 51 initially formed into corrugated sheets by a suitable operation such as a vacuum forming 54 operation within the first oven.
  • the first oven is operated preferably at a maximum temperature of 140 ° C principally to dry the impregnated matting.
  • the oven is heated by infra red heating 52 from beneath the matting as it progresses through the oven.
  • the dried corrugated impregnated matting 59 is then passed to a second oven 60 where the phenolic resin is cured.
  • the oven which is also heated by infra red heaters 62 operates at a temperature above 120 0 C and preferably heats the matting to a temperature of 150 0 C.
  • the matting does not reach a temperature in excess of 200 ° C. Hence it is preferable for the oven to operate at a temperature of less that 200 ° C.
  • the cured web of impregnated material is then passed by belt 64 to a cutting station 66 and in turn the cut sheets are passed to a stacker 68.
  • the resulting corrugated impregnated sheets have excellent fire proofing characteristics and do not produce smoke or flame when subjected to fire conditions.
  • the corrugated impregnated fibre glass sheets then undergo a assembly process in order to produce contact bodies suitable for use in evaporative coolers and cooling towers as shown in Figure 1.
  • the impregnated sheets have a solids content of fire proofing agent which in the case of the above example is Eckalite 1 , (a kaolin clay) of between 10 and 25 wt %, typically 12 to 19 wt % and preferably between 14 and 16 wt %.
  • the sheets In order to produce the contact bodies the sheets initially pass over adhesive coating rollers in order to coat one side of the sheet.
  • the adhesive is formed from an alkali metal silicate in combination with a fire proofing agent which can be the same as that used in the impregnation solution or another suitable fire proofing agent.
  • the adhesive contains up to 50% of a fire proofing agent and preferably less than 40 wt % to ensure adequate rheological properties.
  • Other suitable fire proofing agents are metal oxides or clays.
  • the preferred fire proofing agent is Eckalite 1.
  • the Eckalite 1 is a hydrated aluminium silicate supplied by EEC Australia Pty Ltd.
  • the preferred alkali metal silicate is a liquid sodium silicate "O" grade supplied by PQ Australia Pty Limited.
  • the adhesive mixtures is formed by adding the liquid sodium silicate to a drum and stirring the mixture at 80 rpm.
  • the Eckalite 1 is then slowly added to the liquid sodium silicate and the stirring increased as the mixture thickens. Water is then added to control the viscosity and the formula stirred for a further 45 minutes at 135 rpm.
  • the sheets After the coated sheets pass over the adhesive rollers, the sheets are assembled into pads and cut to size.
  • the front and rear surfaces of the pads are then coated with a coating to seal in the loose fibres exposed by the cutting stage.
  • the coating is preferably the same formulation as the adhesive and the coated pads then pass through an oven where the matting is heated to a minimum of 100°C in order to precure the adhesive on the impregnated sheets.
  • the assembled contact body is then passed through a further oven where the contact body is heated to a temperature of 250 ° to 300 ° C to fully cure and solidify the adhesive and make the contact body waterproof.
  • the produced contact bodies were then tested and found to withstand flame temperatures in excess of 1000 ° C without producing flame or smoke.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Laminated Bodies (AREA)

Abstract

L’invention décrit un procédé de production d'une feuille ignifugée comprenant les étapes consistant à : faire passer un réseau lié de matériau fibreux (42) à travers une solution d'imprégnation, la solution d'imprégnation (44) comprenant de 5 à 40 % en poids d'un liant à base de résine organique, de 5 à 40 % en poids d'un agent ignifugeant et de 20 à 80 % en poids d'un solvant organique ; éliminer la solution d'imprégnation en excès ; former les feuilles imprégnées en feuilles ondulées à une température permettant le séchage des feuilles ; et enfin, faire durcir les feuilles. Un procédé de production d'un corps de contact pour être utilisé dans des tours de refroidissement ou dans des refroidisseurs évaporatifs et des corps de contact est également décrit.
PCT/AU2004/001827 2004-12-24 2004-12-24 Corps de contact et procede de production d'un corps de contact ignifuge WO2006066304A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/AU2004/001827 WO2006066304A1 (fr) 2004-12-24 2004-12-24 Corps de contact et procede de production d'un corps de contact ignifuge

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/AU2004/001827 WO2006066304A1 (fr) 2004-12-24 2004-12-24 Corps de contact et procede de production d'un corps de contact ignifuge

Publications (1)

Publication Number Publication Date
WO2006066304A1 true WO2006066304A1 (fr) 2006-06-29

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PCT/AU2004/001827 WO2006066304A1 (fr) 2004-12-24 2004-12-24 Corps de contact et procede de production d'un corps de contact ignifuge

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102738490A (zh) * 2011-04-15 2012-10-17 通用汽车环球科技运作有限责任公司 用于燃料电池加湿器的湿侧纸
US9551282B2 (en) 2014-10-17 2017-01-24 General Electric Company Media pads with mist elimination features
CN106470825A (zh) * 2014-06-30 2017-03-01 塞特工业公司 用于制造预成型体的干纤维带
US9850816B2 (en) 2013-11-04 2017-12-26 General Electric Company Gas turbine inlet system and related method for cooling gas turbine inlet air
IT202100030443A1 (it) * 2021-12-01 2023-06-01 Axial Fans Int S R L Impianto di termoformatura per pannello

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19818406C1 (de) * 1998-04-07 1999-12-02 Schuller Gmbh Verfahren zum Herstellen einer Wellplatte
EP0677380B1 (fr) * 1994-04-14 2000-05-10 B & B ITALIA S.p.A. Panneau ignifugé et procédé pour sa fabrication
US6645620B1 (en) * 1998-11-23 2003-11-11 Atofina Material based on halogenated thermoplastic resin, comprising long fibers, methods for making same and uses

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0677380B1 (fr) * 1994-04-14 2000-05-10 B & B ITALIA S.p.A. Panneau ignifugé et procédé pour sa fabrication
DE19818406C1 (de) * 1998-04-07 1999-12-02 Schuller Gmbh Verfahren zum Herstellen einer Wellplatte
US6645620B1 (en) * 1998-11-23 2003-11-11 Atofina Material based on halogenated thermoplastic resin, comprising long fibers, methods for making same and uses

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DATABASE WPI Week 200002, Derwent World Patents Index; Class A32, AN 2000-014168 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102738490A (zh) * 2011-04-15 2012-10-17 通用汽车环球科技运作有限责任公司 用于燃料电池加湿器的湿侧纸
US8974977B2 (en) 2011-04-15 2015-03-10 GM Global Technology Operations LLC Wet side paper for fuel cell humidifier
US9850816B2 (en) 2013-11-04 2017-12-26 General Electric Company Gas turbine inlet system and related method for cooling gas turbine inlet air
CN106470825A (zh) * 2014-06-30 2017-03-01 塞特工业公司 用于制造预成型体的干纤维带
US9551282B2 (en) 2014-10-17 2017-01-24 General Electric Company Media pads with mist elimination features
IT202100030443A1 (it) * 2021-12-01 2023-06-01 Axial Fans Int S R L Impianto di termoformatura per pannello
WO2023100207A1 (fr) * 2021-12-01 2023-06-08 Axial Fans Int S.r.l. Installation de thermoformage d'un panneau

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