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WO2001030718A1 - Support pour refroidisseur evaporatif - Google Patents

Support pour refroidisseur evaporatif Download PDF

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Publication number
WO2001030718A1
WO2001030718A1 PCT/US2000/028512 US0028512W WO0130718A1 WO 2001030718 A1 WO2001030718 A1 WO 2001030718A1 US 0028512 W US0028512 W US 0028512W WO 0130718 A1 WO0130718 A1 WO 0130718A1
Authority
WO
WIPO (PCT)
Prior art keywords
media
web
range
resin
water
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
PCT/US2000/028512
Other languages
English (en)
Inventor
Ronald J. Yaeger
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.)
Air and Refrigeration Corp
Original Assignee
Air and Refrigeration Corp
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 Air and Refrigeration Corp filed Critical Air and Refrigeration Corp
Priority to AU80238/00A priority Critical patent/AU8023800A/en
Publication of WO2001030718A1 publication Critical patent/WO2001030718A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/32—Packing elements in the form of grids or built-up elements for forming a unit or module inside the apparatus for mass or heat transfer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
    • B01D47/16—Apparatus having rotary means, other than rotatable nozzles, for atomising the cleaning liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
    • B01D53/18—Absorbing units; Liquid distributors therefor
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
    • C03C25/10—Coating
    • C03C25/24—Coatings containing organic materials
    • C03C25/26—Macromolecular compounds or prepolymers
    • C03C25/32—Macromolecular compounds or prepolymers obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
    • C03C25/328—Polyamides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F5/00—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater
    • F24F5/0007—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning
    • F24F5/0035—Air-conditioning systems or apparatus not covered by F24F1/00 or F24F3/00, e.g. using solar heat or combined with household units such as an oven or water heater cooling apparatus specially adapted for use in air-conditioning using evaporation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D5/00—Heat-exchange apparatus having stationary conduit assemblies for one heat-exchange medium only, the media being in contact with different sides of the conduit wall, using the cooling effect of natural or forced evaporation
    • 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
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/32—Details relating to packing elements in the form of grids or built-up elements for forming a unit of module inside the apparatus for mass or heat transfer
    • B01J2219/322—Basic shape of the elements
    • B01J2219/32203—Sheets
    • B01J2219/3221—Corrugated sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/32—Details relating to packing elements in the form of grids or built-up elements for forming a unit of module inside the apparatus for mass or heat transfer
    • B01J2219/322—Basic shape of the elements
    • B01J2219/32203—Sheets
    • B01J2219/32213—Plurality of essentially parallel sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/32—Details relating to packing elements in the form of grids or built-up elements for forming a unit of module inside the apparatus for mass or heat transfer
    • B01J2219/322—Basic shape of the elements
    • B01J2219/32203—Sheets
    • B01J2219/32213—Plurality of essentially parallel sheets
    • B01J2219/32217—Plurality of essentially parallel sheets with sheets having corrugations which intersect at an angle of 90 degrees
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/32—Details relating to packing elements in the form of grids or built-up elements for forming a unit of module inside the apparatus for mass or heat transfer
    • B01J2219/324—Composition or microstructure of the elements
    • B01J2219/32408—Metal
    • B01J2219/32416—Metal fibrous
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/32—Details relating to packing elements in the form of grids or built-up elements for forming a unit of module inside the apparatus for mass or heat transfer
    • B01J2219/324—Composition or microstructure of the elements
    • B01J2219/32441—Glass
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/32—Details relating to packing elements in the form of grids or built-up elements for forming a unit of module inside the apparatus for mass or heat transfer
    • B01J2219/326—Mathematical modelling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J2219/32—Details relating to packing elements in the form of grids or built-up elements for forming a unit of module inside the apparatus for mass or heat transfer
    • B01J2219/332—Details relating to the flow of the phases
    • B01J2219/3327—Cross-current flow
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/54—Free-cooling systems

Definitions

  • the invention relates to gas-liquid contact media.
  • evaporative coolers The adiabatic saturation process conducted by evaporative coolers is an energy-efficient method for cooling and humidifying in HVAC (heating/venting/air conditioning) systems.
  • HVAC heating/venting/air conditioning
  • media media
  • a major limitation to increased use of evaporative cooling is the high costs of coping with scale build-up.
  • Water contains dissolved salts such as carbonates, sulfates, and nitrates of Ca ++ and Mg ++ which, upon precipitation, form scale.
  • concentration of these scale-forming salts in the water increases until precipitates form.
  • Deposits of these precipitates routinely form onto the surfaces of the gas-liquid contact media utilized in the evaporative cooling system. As the deposits build up, the water and air passages in the media become blocked or partially blocked, reducing the cooling efficiency of the system. Moreover, the added weight from the scale deposits can cause deterioration or collapse of insufficiently supported media.
  • Gas-liquid contact media used in evaporative cooling systems are routinely made of layered cellulose, asbestos, or fiberglass sheets which contain folds, channels, or passageways through which the air and water pass.
  • the media can be configured in stacked arrays or formed into drip pads, sprayed pads, packed cells, rotating wheels, or other types of such contact media.
  • Polovina discloses a gas-liquid contact apparatus made with an acid-, alkali-, and water- resistant fibrous web impregnated with a mixture of a chlorinated polymeric C 3 and C 5 hydrocarbon, a plasticizer of chlorinated terphenyl or chlorinated paraffin, and a polyglycidyl ether of a polyhydric phenol such as bisphenol A or bisphenol F. According to Polovina, this treatment provided increased durability under conditions such as pH and temperature extremes which normally cause rapid disintegration of contact bodies.
  • the stiffening resins described above are all categorized as anionic, forming negatively charged sites along the polymer chain of the resin which attract positively charged particles or ions such as calcium (Ca +2 ) , magnesium (Mg +2 ) , potassium (K + ) , and sodium (Na + ) ions. Consequently, these resins contribute to the attraction of scale-forming materials onto the surface of contact media, exacerbating the problem of scale buildup.
  • the present invention is a gas-liquid contact media having a web of fibrous material impregnated with an aqueous-based resin which maintains a positive charge on the surface of the web when exposed to water.
  • the fibrous material comprises glass.
  • the fibrous material comprises borosilicate glass.
  • the resin comprises an aqueous-based polyamide-imide having a pH within the range of about 2.0 to about 6.5 which cross-links at a temperature range of about 275° to about 400°F.
  • Another preferred embodiment comprises an aqueous-based polyamide-imide having a pH within the range of about 6.0 to about 6.5 which cross-links at an temperature of about 275° to about 400°F.
  • the resin content is within the range from about 5% to about 25% by dry weight of the treated contact media.
  • the resin content is within the range from about 10% to about 15% by dry weight of the treated contact media.
  • the web is an array of a plurality of facially opposed corrugated sheets with the corrugations in adjacent sheets being disposed at an angle to each other and the corrugations in alternate sheets being disposed parallel to each other to form a plurality of criss-crossing channels.
  • a most preferred embodiment is a gas-liquid contact media comprising an array of corrugated sheets comprising a fibrous web of borosilicate glass impregnated with an aqueous-based polyamide-imide resin having a pH within the range from about 6.0 to about 6.5 which cross-links at a temperature of about 275° to about 400°F.
  • the final resin content of the contact media is within the range from about 10% to about 15% dry weight of the contact media
  • the array of corrugated sheets is a plurality of facially opposed corrugated sheets with the corrugations in adjacent sheets being disposed at an angle to each other and the corrugations in alternate sheets being disposed parallel to each other such that the corrugated sheets form a plurality of criss-crossing channels.
  • the present invention is a web of fibrous material impregnated with an aqueous-based resin which maintains a positive charge on the surface of said fibrous web when exposed to water.
  • the fibrous material comprises glass.
  • the fibrous material comprises borosilicate glass.
  • the resin comprises an aqueous-based polyamide-imide having a pH within the range of about 2.0 to about 6.5 which cross-links at a temperature of about 275° to about 400°F.
  • a preferred embodiment comprises an aqueous-based polyamide-imide having a pH within the range of about 6.0 to about 6.5 which cross-links at a temperature of about 275° to about 400°F.
  • the resin content is from about 5% to about 25% by dry weight of the treated fibrous material. In a preferred embodiment, the resin content is from about 10% to about 15% by dry weight of the treated fibrous material.
  • the present invention is a method of cooling air by evaporation wherein water and air are passed through a gas-liquid contact media having a web of fibrous material impregnated with an aqueous- based resin which maintains a positive charge on the surface of the web when exposed to water, whereby the water evaporates adiabatically into to air and thereby cools the air.
  • the fibrous material comprises glass.
  • the fibrous material comprises borosilicate glass.
  • the resin comprises an aqueous- based polyamide-imide having a pH within the range of about 2.0 to about 6.5 which cross-links at a temperature of about 275° to about 400°F.
  • the resin comprises an aqueous-based polyamide- imide having a pH within the range of about 6.0 to about 6.5 which cross-links at a temperature of about 275° to about 400°F.
  • the resin content is from about 5% to about 25% by dry weight of the treated contact media.
  • the resin content is from about 10% to about 15% by dry weight of the treated contact media.
  • the web is an array of a plurality of facially opposed corrugated sheets with the corrugations in adjacent sheets being disposed at an angle to each other and the corrugations in alternate sheets being disposed parallel to each other to form a plurality of criss-crossing channels.
  • a gas- liquid contact media comprising an array of corrugated sheets comprising a fibrous web of borosilicate glass impregnated with an aqueous-based polyamide-imide resin having a pH within the range from about 6.0 to about 6.5 which cross-links at a temperature of about 275° to about 400°F.
  • the final resin content of the contact media is from about 10% to about 15% dry weight of the contact media
  • the array of corrugated sheets is a plurality of facially opposed corrugated sheets with the corrugations in adjacent sheets being disposed at an angle to each other and the corrugations in alternate sheets being disposed parallel to each other such that the corrugated sheets form a plurality of criss-crossing channels.
  • Fig. 1 is a perspective view of a block of corrugated media according to the preferred embodiment of the present invention, with portions broken away to better illustrate the structure.
  • the media, or gas-liquid contact apparatus, of the present invention can be constructed from corrugated sheets of fibrous web material, for example glass fibers.
  • glass fibers Preferably, borosilicate glass is used. While glass fibers are the preferred composition, any material capable of providing a suitable gas-liquid contact means which is (1) unreactive to the aqueous-based cationic or non-anionic resins of the present invention and (2) maintains a positive charge on the surface of the material when impregnated with an aqueous-based resin and exposed to water, would fall within the scope of this invention.
  • Sheets of fibrous webs are impregnated with an aqueous-based cationic or non-anionic resin.
  • Preferred resins are polyamide-imide resins or polyamide-imide resins blended with other compatible polymer resins such as epoxies, acryides, etc. All resins are water dispersible in an acidic media without the use of emulsifying surfactants.
  • the resins/resin blends after evaporation of water, provide water insoluble films by their inherent thermoplastic or thermosetting characteristics or attain such properties through cross- linking due to heat and/or reaction with functional groups which are compatible with the acidic media used.
  • the resin is a polyamide-imide having a pH within the range of about 2.0 to about 6.5, and preferably having a pH within the range of about 6.0 to about 6.5 which cross-links when cured at a temperature of about 275° to about 400°F., more preferably, of about 300° to about 350°F.
  • the sheets After application of the resin to the sheets, the sheets are forced into a mold having a desired shape, e.g., corrugated mold, and carried through an oven at temperatures appropriate for drying and curing.
  • An elevated temperature is required in the curing of the resin and also increases the rate of cross-linking in the resin, i.e., the higher the temperature range the faster the rate of cross-linking.
  • the required elevated temperature range varies for different types of resins, and would be within the skill of one in the art to determine the appropriate temperature range.
  • the preferred temperature range is from about 275° to about 400°F., and more preferably, from about 300° to about 350°F.
  • the final resin content of the cured sheets is in the range of about 5% to about 25% by dry weight of the sheets, and preferably in the range of about 10% to about 15% by dry weight.
  • cross-linked resins of the present invention normally exhibit chemical resistance to pH variances in water. This durability under extreme acid or base conditions provides distinct advantages over other treatment methods .
  • Additives may be added to the resins of the present invention which provide improved physical and chemical strength to the resin. Such additives cannot interfere with the cationic or non-anionic properties of the resin. Starches which are cationic are examples of one type of additive useful in the present invention.
  • Fig. 1 Shown in Fig. 1 is a block 10 of media, formed from corrugated sheets 12 impregnated with aqueous based cationic or non-anionic resin as described above.
  • the sheets 12 are formed into the relatively homogeneous block 10 of media by the following process.
  • a water resistant adhesive is applied to the corrugations 14 or ridges of the sheets 12, and an appropriate number of sheets are stacked facially opposed such that the corrugations in adjacent sheets (i.e., sheets attached to each other in the array) are disposed at an angle to each other and the corrugations in alternating sheets (i.e., every other sheet in the array) are parallel.
  • This arrangement of the corrugated sheets 12 forms a plurality of crisscrossing channels (indicated by arrows 16) , the channels in every other sheet running parallel to each other, and with the channels in adjacent sheets running at a fixed angle to each other. If desired, upon curing the water resistant adhesive, the block 10 of corrugated sheets 12 comprising the media can be cut into a size and shape preferable for the gas- liquid contact media.
  • the aqueous-based cationic or non- anionic resins of the present invention ionize to form positively charged sites along the polymer chain of the resin, and consequently, repulse positively charged particles or ions such as calcium (Ca +2 ) , magnesium (Mg +2 ) , potassium (K + ) , and sodium (Na + ) ions which may be present in the water.
  • a method of cooling air by adiabatic evaporation of water utilizes a gas-liquid contact media which has been treated with a cationic or non-anionic resin that maintains a positive charge on the surface of the media so as to prevent scale build-up.
  • Water is applied to the surface of the media, and air is moved through the media is such a way that the air comes in contact with the water. As the water on the media adiabatically evaporates into the air, the air is cooled.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Thermal Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Combustion & Propulsion (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Materials Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Analytical Chemistry (AREA)
  • Sustainable Development (AREA)
  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Abstract

La présente invention concerne un support de contact gaz-liquide, traité avec une résine cationique ou non anionique de base aqueuse, permettant d'éviter la formation de dépôts de tartre sur la surface dudit support. Le support de contact est réalisé à partir d'une bande de matériau fibreux, du verre par exemple, imprégné d'une résine cationique ou non anionique de base aqueuse, de préférence une résine polyamide-imide.
PCT/US2000/028512 1999-10-22 2000-10-13 Support pour refroidisseur evaporatif Ceased WO2001030718A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU80238/00A AU8023800A (en) 1999-10-22 2000-10-13 Media for evaporative cooler

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US42622899A 1999-10-22 1999-10-22
US09/426,228 1999-10-22

Publications (1)

Publication Number Publication Date
WO2001030718A1 true WO2001030718A1 (fr) 2001-05-03

Family

ID=23689887

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/028512 Ceased WO2001030718A1 (fr) 1999-10-22 2000-10-13 Support pour refroidisseur evaporatif

Country Status (2)

Country Link
AU (1) AU8023800A (fr)
WO (1) WO2001030718A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1451786A (en) * 1972-10-19 1976-10-06 Munters Ab Carl Method of manufacturing a contact body
WO1991003378A1 (fr) * 1989-09-07 1991-03-21 Hexcel Corporation Nid d'abeilles thermoplastique et procedes de preparation
EP0436478A1 (fr) * 1989-12-07 1991-07-10 Ab Carl Munters Perfectionnement d'une construction à double pli pour un élément de corps de contact
WO1992016362A1 (fr) * 1991-03-12 1992-10-01 Hexcel Corporation Nid d'abeilles en polymere renforce par toile, et procede de fabrication
US5731081A (en) * 1991-10-16 1998-03-24 Hollinee Corporation Glass fiber evaporative cooler media with melamine formaldehyde binder
EP1008566A1 (fr) * 1998-12-10 2000-06-14 Showa Aircraft Industry Co., Ltd. Structure en nid d'abeilles et méthode de sa production

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1451786A (en) * 1972-10-19 1976-10-06 Munters Ab Carl Method of manufacturing a contact body
WO1991003378A1 (fr) * 1989-09-07 1991-03-21 Hexcel Corporation Nid d'abeilles thermoplastique et procedes de preparation
EP0436478A1 (fr) * 1989-12-07 1991-07-10 Ab Carl Munters Perfectionnement d'une construction à double pli pour un élément de corps de contact
WO1992016362A1 (fr) * 1991-03-12 1992-10-01 Hexcel Corporation Nid d'abeilles en polymere renforce par toile, et procede de fabrication
US5731081A (en) * 1991-10-16 1998-03-24 Hollinee Corporation Glass fiber evaporative cooler media with melamine formaldehyde binder
EP1008566A1 (fr) * 1998-12-10 2000-06-14 Showa Aircraft Industry Co., Ltd. Structure en nid d'abeilles et méthode de sa production

Also Published As

Publication number Publication date
AU8023800A (en) 2001-05-08

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