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WO1992020755A1 - Support d'echange thermique et articles fabriques avec ce dernier - Google Patents

Support d'echange thermique et articles fabriques avec ce dernier Download PDF

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Publication number
WO1992020755A1
WO1992020755A1 PCT/US1992/004597 US9204597W WO9220755A1 WO 1992020755 A1 WO1992020755 A1 WO 1992020755A1 US 9204597 W US9204597 W US 9204597W WO 9220755 A1 WO9220755 A1 WO 9220755A1
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WO
WIPO (PCT)
Prior art keywords
heat exchange
clay
heat
oil
exchange medium
Prior art date
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Ceased
Application number
PCT/US1992/004597
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English (en)
Inventor
Thomas E. Hughes
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Individual
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Individual
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Publication date
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Publication of WO1992020755A1 publication Critical patent/WO1992020755A1/fr
Anticipated expiration legal-status Critical
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
    • C09K5/08—Materials not undergoing a change of physical state when used
    • A—HUMAN NECESSITIES
    • A45—HAND OR TRAVELLING ARTICLES
    • A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
    • A45D4/00—Separate devices designed for heating hair curlers or hair-wavers
    • A45D4/16—Independent devices characterised by heating the hair-curling or hair-waving means before use
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
    • A61F7/02—Compresses or poultices for effecting heating or cooling
    • A61F2007/0242—Compresses or poultices for effecting heating or cooling heated by microwaves
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F7/00—Heating or cooling appliances for medical or therapeutic treatment of the human body
    • A61F7/02—Compresses or poultices for effecting heating or cooling
    • A61F2007/0244—Compresses or poultices for effecting heating or cooling with layers
    • A61F2007/026—Compresses or poultices for effecting heating or cooling with layers with a fluid absorbing layer

Definitions

  • HEAT EXCHANGE MEDIUM AND ARTICLES FOR USE THEREOF Field of the Invention This invention relates to a heat exchange medium made from clay and oil and to use of the heat exchange medium to make various articles therefrom.
  • Background of the Invention Many thermal storage mediums capable of transferring heat and cold have been employed for absorbing, containing, storing, and releasing heat.
  • Various ice-pack-like products and other insulators have been utilized to absorb and release heat to foods, the human body, and other applications.
  • U. S. Patent No. 4,253,983 to Blanie discloses a thermally conductive paraffin composition used as a shapeable heat casing element for storing and releasing heat.
  • the thermal properties may be improved by incorporating therein finely divided metals, their oxides, or their silicates.
  • Various therapeutic applications for such compositions are described in the '983 patent.
  • the composition described therein comprises powdered clay in an amount of 83 to 85 percent and industrial oil in an amount of 15 to 17 percent.
  • the components are mixed together and coated onto the foundation of buildings to prevent frost deformation and freeze-adhesion of moist substances.
  • PCT application Publication No. O90/05508 discloses a heating pad having an inner pouch and an outer cover.
  • the inner pouch encloses a heat retaining liquid with granules of comminuted polyurethane foam material therein.
  • the polyurethane granules store heat when the liquid is heated and the heating pad gives off warmth thereafter.
  • the material may be heated by microwaves.
  • the liquid generally comprises a heat retaining base material formed from gel, wax or oil such as paraffin wax, or vegetable, mineral or animal oils.
  • the material may also comprise a mixture of ethylene or propylene glycol and methyl cellulose, as well as various other additives. ⁇ . S. Patent Nos.
  • the '726 patent discloses a microwave-activated heating element comprising a water saturated cellular core, water, a heat and flame resistant rubber coated with a high temperature lubricant, and a wax center core therein to absorb and store heat from the microwave heatable water and rubber component.
  • the construction of the heating element may be concentrically wound, tubular, layered, or sectioned particles as necessary to conform to the specific design of the appliance in which the heating element is to be used.
  • the patent describes a number of example applications such as hair rollers, curling irons, food warmers, and heating pads.
  • the '593 patent discloses another microwave- activated heating element in various forms.
  • the heating element includes a multi- layered cartridge having a center core for dissipating heat, a layer of material reactive to microwaves for retaining heat, and an outer layer of paper for sealing the cartridge but allowing heat to radiate therefrom.
  • the heating element has multiple rubber and cellular water retaining layers disposed about a central core of wax material.
  • Another form described therein discloses a heating element comprising clay disposed within a covering and including various components such as water or oil. Rubber particles and high temperature lubricants may also be added to the microwave heatable clay/oil « mixture for enhancing the heat retention aspects
  • the materials may be carcinogenic, may produce gases or other harmful agents, are generally expensive to manufacture, and require considerable energy during the
  • the prior art is generally deficient in affording a non-toxic, biodegradable, environmentally safe, recyclable composition that, when combined in proper proportions and subjected to heat treatment, may be made into various solid, flexible, and viscous forms
  • the present invention overcomes the shortcomings of the prior art in that a heat exchange medium is disclosed that safely and effectively stores and transmits heat and cold in various articles.
  • Another object of the present invention is to provide various articles, including building materials, solar energy collectors, root zone insulators, food warmers and coolers, electrical insulators, and other commercial products employing a heat exchange medium comprising clay and oil that may be heat treated.
  • the present invention is directed to a composition
  • a composition comprising clay and oil used to produce various articles for absorbing, retaining, and dispensing heat.
  • the heat exchange composition is preferably heat treated to provide a medium with increased heat retention, as well as decreased moisture and gas constituents. Heat treating of the present heat exchange medium also renders the composition electrically non-conductive and sufficiently solid to allow shaping and molding thereof.
  • the properties of the heat exchange medium may be further modified by adding various components thereto, including moisture absorbents, such as polyacrylamide, to further decrease the potential for gaseous expansion within closed packaging.
  • the composition may have cloth or polymer fibers, such as polyprop lene, added thereto to produce various articles of manufactur .
  • the heat exchange medium also functions extremely well when used in combination with other heat exchange mediums to produce heatable and coolable products having unique characteristics.
  • the present heat exchange medium is useful for producing composites having alternating layers of microwave heatable and microwave transparent mediums.
  • the heat exchange medium is composed of a basic clay and oil mixture.
  • the clay is generally present in an amount of from about 25 percent to about 85 percent and the oil or other constituents are present in amounts of from about 15 percent to about 75 percent.
  • Various types of clays can be used as well as various types of oils.
  • the clay/oil composition is heat treated at temperatures of from about 325°F to about 425°F for a period of from about 30 to about 60 minutes.
  • the heat treating process renders the composition increasingly plasticized which results in superior moldability characteristics even at temperatures below -20°F.
  • the heat treating process allows the heat exchange composition to remain 15 to 20 percent cooler, to store heat 15 to 20 percent longer, and to produce 85 to 95 percent less moisture and gases than the composition if not subjected to heat treatment.
  • the present invention eliminates the need for special handling and disposal procedures that are often involved with other heat exchange mediums.
  • the present invention also avoids using limited natural resources, such as petroleum-based ingredients. Clay is relatively plentiful and readily available at low cost. It is safe and easy to produce, store, and distribute, and is completely safe to handle.
  • the present heat exchange composition is recyclable and cleans up effectively with soap and water until after it is heat treated.
  • the basic composition comprises a mixture of clay and oil.
  • the clay is present in an amount of from about 25 percent to about 85 percent and the oil or other constituents are present in an amount of from about 15 percent to about 75 percent.
  • the actual percentages are based on the characteristics and properties desired relative to the chosen application of the heat exchange medium. Generally, a higher clay content results in a more viscous and solidified material whereas a higher oil content results in a more fluid and flowable heat exchange medium.
  • the heat exchange composition is heat treated to achieve unique and desirable properties.
  • the heat treated composition results in a solidified and cohesive composition that is substantially more workable than the basic clay/oil composition.
  • the heat treated medium is moldable and the oil in the mixture is not as easily separable from the clay. If not heat treated, the oil in the basic clay/oil composition tends to separate.
  • the heating process removes various impurities that may be present in the clay/oil composition. Removal of impurities is particularly important when the heat exchange medium requires sterilization for use in health care and other therapeutic applications.
  • Heat treating also removes various gas producing elements.
  • a sealed containment vessel generally a plastic such as polyethylene or polypropylene
  • a popping sound is heard at about 300°F, indicating the presence of expanding gases within the vessel.
  • expansion of gases results in structural stresses on the encapsulating containment vessel with the end result being a leak of the composition outside the packaging.
  • Heat treatment removes a substantial portion of the moisture and gas producing constituents so that the resulting heat treated heat exchange medium may be heated numerous times without failure of the encapsulating compartment.
  • a further benefit of heat treating is that the basic clay/oil composition then becomes dielectric, or non-electrically conductive. This characteristic allows the heat treated composition to be used as an electrical insulator in various applications. One such application is to replace the oil-based substances currently employed in many electrical transformers with the present heat treated medium. The heat treating process removes substantially all of the electrolytes found within the composition.
  • heat treating is most preferred within the range of 325°F to 425°F for 30 to 60 minutes
  • various other temperatures and lengths of time can be used to heat treat the composition to achieve various desired characteristics.
  • the extent of heating also depends on how the heat treating process is effectuated. For example, if microwaves are being used to heat treat the composition, cycling of the microwave heating may be necessary so that excessive temperatures are minimized.
  • a further benefit of the heat treated composition is that it results in a heat exchange medium allowing for a more rapid spread of microwaves throughout the medium than that found in the basic clay/oil composition.
  • the heat conduction, or thermal diffusivity, of the heat exchange medium is enhanced by the heat treatment.
  • heat retention is improved by 15 to 20 percent. Either cold or heat, depending on which is being retained, is retained 15 to 20 percent longer in the heat treated composition than in the basic clay/oil composition.
  • Heat treating of the composition permanently changes the medium. Further heat treating and/or cooling does not result in a reversion of the composition to its initial free-flowing form.
  • One particularly beneficial aspect of heat treating the composition is that the heat treated composition remains flexible even at temperatures below -20°F.
  • the heat treating of the composition does not, however, decrease the medium's ability to be cooled and heated in indefinite repeated cycles from below -20°F through and above 675°F.
  • the present invention may be better understood by reference to the following examples and described embodiments.
  • Example 1 To form the basic clay/oil composition of the present composition, a dry, fine, preferably 60-200 mesh, clay material is mixed with a vegetable oil in a proportion of approximately one part oil to three parts clay.
  • the oil may be derived from any vegetable, such as soybeans, and the clay in this particular embodiment is a microwave reactive clay such as that described below.
  • Vegetable oil is microwave reactive, which means that it also may be heated by microwaves.
  • the basic composition may also be heated by other conventional means including gas, electrical, steam, hot water, solar, and the like.
  • the composition when exposed to various cooling agents such as refrigeration appliances, refrigerants, dry ice or other cold transfer mediums, will absorb, store, contain and transfer the cold temperatures.
  • the composition forms an extrudable, pliable medium for heat and cold that exhibits a broad range of temperature storage capabilities from below -20°F through about 375°F.
  • the clay material used in the present composition is a mixture of the constituents listed below: Silica (Si0 2 )
  • the clay/oil composition may incorporate a form of clay known as bentonite.
  • bentonite a form of clay known as bentonite.
  • 15 to 20 percent of the clay base material employed in Example l is replaced with a like amount of bentonite clay.
  • Bentonite is also microwave reactive, maintaining the capability of the clay component of the medium to be heated in a microwave.
  • Use of bentonite in the composition also results in a heat exchange medium exhibiting better plasticity and moldability.
  • the bentonite clay used has the following constituents: Silica (Si0 2 ) 58.00 - 64.00%
  • Example 2 A comparison of water and the heat treated form of the bentonite-containing heat exchange composition of Example 2 was conducted. At 77°F, the viscosity of the heat exchange medium was 45 poise and the density was 15 pounds per gallon, compared to water which has a viscosity of 1 centipoise and a density of 8 pounds per * gallon. The freezing point of water is 32°F and the
  • the specific gravity of water is 1 gram per milliliter and the specific gravity of the heat exchange medium was found to be 1.78 grams per milliliter.
  • the specific heat of water is 4.2 kj/kg°C 10 and the specific heat of the heat exchange medium was found to be 2.5 kj/kg°C.
  • the microwave visible vegetable oil is replaced by a microwave invisible substance such as mineral oil.
  • a microwave invisible substance such as mineral oil.
  • Example 4 A further variation of the present heat exchange medium allows for decelerated heat absorption by using a non-microwave heatable clay base material.
  • a non-microwave heatable clay base material is kaolin.
  • kaolin is substituted for the clay described in Example 1 and a decreased heating of the composition is achieved.
  • This particular form of the composition is particularly useful when the heat exchange medium absorbs heat from a source other than high frequency microwaves.
  • Kaolin generally has the following constituents:
  • Titania Ti0 2
  • Magnesia MgO
  • Calcium Oxide CaO
  • hardening agents are also known as plasticizers and are well known for their ability to solidify compositions. Hardening agents should be chosen that are heat and cold resistant so that the agents are not degradated by constant heating and cooling thereof.
  • Example 5 the heat exchange composition is subjected to heat treatment as described above.
  • any of the clay/oil compositions described in Examples 1-4 can be heat treated to attain such a medium.
  • the process of heat treating the composition involves heating the clay/oil basic composition to a temperature in the range of from about 325°F to about 425°F for a period in the range of from about 30 minutes to about 60 minutes.
  • the heat treating process can be effectuated by heating the composition in any heatable vessel, or while being extruded, by any heating means, including microwaves, gas, electrical, and the like.
  • the clay/oil composition is preferably stirred or turned so that heat is transmitted throughout the composition.
  • Example 6 The clay/oil composition of Example l was heated as described in Example 5 at 375°F for a period of about 60 minutes. A semi-soft, flexible heat exchange medium was produced thereby.
  • Example 7 The clay/oil composition of Example 1 was heated as described in Example 5 at 475°F for a period of about 30 to 40 minutes. A semi-hard, semi-flexible produc was produced thereby.
  • Example 8 The clay/oil composition of Example 1 was heated as described in Example 5 at about 575°F for a period of about 30 minutes. A hardened, unflexible product was produced thereby.
  • Example 9 The clay/oil composition of Example 1 was heated as described in Example 5 at about 675°F for a period of about 40 minutes to one hour. A very hard brick ⁇ like product was produced thereby.
  • any of the heat treated compositions described in Examples 5-9 may be employed as a heat exchange medium in various articles and for various applications.
  • the mediums of Examples 5-9 are capable of being molded and formed, and therefore, may be used in various shapes, thicknesses, sizes and hardnesses for heat absorption, storage, and transmission.
  • Such uses include the formation of molded solid and semi-solid insulating blankets, solar energy collectors, heat or cold retention liners, food warmers and/or coolers, building structures capable of maintaining heat and having insulation characteristics such as floor and wall area covers and bricks, coatings for various substrates such as sheetrock and plaster, various therapeutic and orthopedic heat/cold devices for both humans and animals, electrical insulators, and substrates for use in producing electronic circuit boards where heat retention or dissipation is necessary.
  • woven, non-woven, and loose fibers made of various materials may be added to the heat treated medium of Examples 5-9 and/or the basic clay/oil compositions of Examples 1-4.
  • the addition of fibers strengthens the composition and provides for further molding capabilities.
  • electrically conductive fibers may be added to transform the dielectric composition into an electrically conductive composition.
  • the fibers may be added to the compositions during the heating process or afterwards while the composition is still hot. Adequate dispersion of the fibers throughout the composition may be achieved by mixing or hand laying of the fibers.
  • Fibers may be added fibers in the form of wraps, sheets, and mats of various thicknesses and sizes.
  • the fibers may be fibers of cloth or polymeric fibers, such as polypropylene fibers.
  • Other fibers that may be utilized include graphite, textiles, other polymeric fibers, fiberglass fibers, ceramic fibers, or even fibers comprising the clay/oil composition described herein.
  • the fiber-treated composition can be used in applications requiring an effective sealant against water, solvents, toxic waste, landfill leaching and the like.
  • Such practical applications for use of the heat exchange medium with fibers immersed therein include roofing, basement sealers, landfill sealers, pond sealers and roadbed sealers.
  • the composition of the present invention is impermeable to various organic solvents, including alcohol, acetone and ether.
  • the composition is also impermeable to water.
  • Another desired property resulting from fiber immersion within the composition is the increased uniformity of thermal diffusivity throughout the heat exchange medium. Like heat treatment, fibers tend to spread the heat or cold throughout the medium more evenly.
  • Heat treating described above may be applied before or after the fibers are impregnated into the composition.
  • the composition may alternatively be cured in warm, dry air.
  • air drying allows the fiber- impregnated composition to more effectively mold and seal to the area of application. Air drying may also be more cost and energy efficient than supplying heat by other means.
  • Adding polypropylene or other polymeric substances to the composition allows for manufacture of plastic articles having the capability of absorbing, retaining and dispensing heat. Polypropylene does not substantially affect the cold/heat retention characteristics of the composition and is also microwave invisible.
  • Other various polymeric substances which may be used include any of the plastics such as polytetrafluoroethylene and polyethylene.
  • polypropylene may be added to the clay/oil composition during the heat treating process.
  • one part polypropylene powder was combined with three parts of the clay/oil composition described in Example 1.
  • the clay/oil/polymer composition produced thereby may then be extruded into fibers and molded into various articles.
  • the fibers formed thereby may be used as sheeting, mats, textile products, insulation, and may also be molded to form microwave heatable products.
  • One such composition employing polypropylene was cooled as low as -20°F and heated up to 225°F and exhibited substantially longer cold and heat retention than the composition without the polymeric fibers.
  • a moisture absorbent may be added to the basic clay/oil compositions of Examples 1-4 or the heat treated versions of the composition described in Examples 5-9.
  • One such moisture absorbent for use in the present invention is polyacrylamide.
  • Moisture absorbents reduce the gas producing constituents to thereby lessen the possibility of gaseous expansion within the packaging. Moisture absorbents having the ability to operate within the temperature ranges of the present invention may be employed.
  • Polyacrylamide is a preferred moisture absorbent because it is operational in a temperature range from -40°F to 400°F. In one particular mixture of the present invention with a moisture absorbent, 16 ounces of the basic clay/oil composition described in Example 1 was mixed with two ounces of water-impregnated polyacrylamide.
  • Water-impregnated polyacrylamide was initially made by combining two ounces of water with three grams of dry, 200 mesh (0-500 micron size) , powdered polyacrylamide.
  • the water-impregnated polyacrylamide is added to the present composition in the form of a gel-like material. This particular composition acts as a low temperature reservoir for cold temperatures down to -60°F.
  • Another form of the moisture absorbent/clay/oil composition that prevents solid freezing and formation of ice crystals utilizes alcohol or propylene glycol to replace 25 percent of the water in making the water- impregnated polyacrylamide.
  • alcohol or propylene glycol to replace 25 percent of the water in making the water- impregnated polyacrylamide.
  • 25 percent of the water used in making the water- impregnated polyacrylamide described above is substituted with a like amount of alcohol or propylene glycol.
  • At operational temperatures below 0°F up to about 50 percent of the water may be replaced in the water-impregnated polyacrylamide with propylene glycol.
  • the polyacrylamide powder When substituting alcohol or propylene glycol for water, the polyacrylamide powder must be mixed with the water first and then the alcohol or propylene glycol must be added thereto.
  • the resulting heat exchange medium employing the moisture absorbent increases the cold retention characteristics of the clay/oil composition by creating a suspension in which oil and water combine with the clay to function as a cold to hot reservoir. This particular medium allows oil and water to mix without tending to separate.
  • Example l In another embodiment employing a moisture absorbent, 0.5 ounces of dry, 200 mesh polyacrylamide powder was combined with 16 ounces of the basic clay/oil composition of Example l. The composition was formed into a heat exchange medium and encapsulated within a plastic package. The clay/oil mixture in combination with the moisture absorbent did not produce substantial gases when it was heated above 275°F. Accordingly, any potential for seal failure of the encapsulating package is lessened by use of the moisture absorbent. A water-soaked and frozen heat exchange medium of same also remained frozen 2.4 times longer than frozen water alone.
  • the present invention may also employ a booster pack within an encapsulated pack of the basic clay/oil or heat treated clay/oil composition as shown in Figures 1 and 2 as described below.
  • a "booster" pack of the clay/oil composition may be made in either heat treated or non-heat treated form.
  • the booster package should exhibit a different thermal capability than the clay/oil composition package within which the booster pack maintains contact.
  • the booster package contains the basic clay/oil composition as described in Examples 1-4 which is not heat treated.
  • the composition of the booster package contains polyacrylamide therein to provide the properties discussed above.
  • the main vessel preferably contains the heat treated version of the composition made in accordance with Examples 5-9.
  • the booster package may be sealed inside of a larger containment vessel carrying another form of the present composition as in Figure 1 or may be a separate vessel as shown in Figure 2.
  • a booster package form within a larger main pack, the cold retention and heat retention of the entire pack may exceed former retention times by 50 percent.
  • a surrounding clay/oil composition acts as an insulator to preserve and retain the heat or cold within in the booster portion of the product and to provide for a substantially slower dissipation of the heat from the booster package.
  • Encapsulated package 1 is the main vessel and preferably contains the heat treated version of the clay/oil composition made in accordance in the Examples 5-9.
  • Encapsulated package 2 is the booster pack which is smaller than encapsulated package 1 and preferably contains the basic clay/oil composition described in Examples 1-4.
  • encapsulated booster package 2 is shown as an integral portion of the main vessel encapsulated package 1. As described below, heat or cold treating of the arrangement, including both packages 1 and 2 results in more heat in the booster package 1.
  • Encapsulated package one, containing the heat treated clay/oil composition can then maintain the heat or cold of booster package 1.
  • FIG. 2 shows another embodiment of the present invention wherein encapsulated package 2 (booster pack) is attached to encapsulated package 1 through a suitable securing means such as a velcro strap 3.
  • a suitable securing means such as a velcro strap 3.
  • the booster pack 2 is removable and replaceable relative to the main vessel 1.
  • the entire heating unit is then attached to a part of the body, or other structure, through use of other securing means such as velcro straps 4.
  • the entire pack including the main package 1 with the heat treated composition therein and the booster pack 2 containing the non-heat treated composition attached thereto, either encapsulated within the main package 1 as shown in Figure 1 or attached separately but in conductive relationship with at least a portion of the main package 1 as shown in Figure 2, is heated or cooled as necessary.
  • the booster portion of the heating or cooling element achieves higher temperatures and dissipates the heat or cold at a more rapid rate.
  • booster package 2 After the booster package 2 dissipates its heat or cold into the surrounding main pack 1, the booster package 2 in the embodiment shown in Figure 2 may be removed and replaced with another booster package which has been either cooled or heated as needed.
  • the resulting application allows main pack 1 to remain in place permanently, or at least for an extended period of time, while booster package 2 is removed and then reheated or recooled and then replaced into conductive relationship with main package 1. In this manner, booster package 2 is the only portion of the heating element all that is reheated or recooled.
  • booster/main package arrangement was tested on randomly selected patients who had undergone third molar odontectomies. Some of the patients who had undergone the oral surgery received an encapsulated main pack with booster pack separate therefrom but in a conductive relationship therewith as shown in Figure 2, i.e., the booster pack was a separately encapsulated package which in use was merely secured or placed into contact with the main pack. Other patients received conventional ice packs. When using the packs of the present invention, the main pack remained on the patients' skin surrounding the location of the oral surgery for about eight hours. The small booster packs containing the non-heat treated composition of Example 1 was removed and cooled every one and half hours or as necessary.
  • the conventional ice packs only maintained sufficient cooling treatments for 20 to 40 minutes.
  • the booster package arrangement of the present invention allowed main pack 1 to maintain sufficient cooling properties during the entire eight hours, provided that the small booster pack 2 was replaced about every hour and a half.
  • the present invention may be employed in a blanket-type structure such as that shown in Figure 3.
  • This particular embodiment has alternating layers of microwave heatable and microwave transparent mediums as shown in Figure 4.
  • an initial top layer 20 of a blanket generally indicated as 10, or other structure may comprise a microwave transparent medium such as mineral oil and/or microwave invisible clay such as kaolin.
  • the next layer 22 underneath top layer 20 may comprise a microwave reactive layer such as vegetable oil or bentonite clay. Layers thereunder may have alternating or successive microwave heatable and microwave invisible layers.
  • microwave heatable clays include montmorillonite, kollinite, nacrite, dickite, holloysite and illite, in addition to the previously- described bentonite.
  • Hair rollers as shown in Figures 5 and 6 may also employ the present heat exchange medium.
  • a fluid/air flow channel 30 in the center of concentric layers encapsulated by layers of the heat exchange mediums is provided.
  • the center channel is preferably immediately encapsulated by a microwave heatable layer 34 of the bentonite/oil composition described in
  • Example 2 and the next concentric layer 36 contains the clay/oil composition wherein kaolin, a microwave invisible clay, is employed.
  • kaolin a microwave invisible clay
  • a hair roller heating system as shown in Figure 5 for heating the hair rollers can be provided as an alternate heating source in addition to the capability of the rollers to be heated by microwaves.
  • the fluid/air flow channel 30 may cooperate with an electrical heating element 40 used for heating conventional electrical rollers to supply heat to the roller.
  • the inner microwave heatable layer heats rapidly, transferring heat through the outer microwave invisible layer at a much slower rate. This creates a heat transfer article with a core temperature substantially warmer than the outer layer.
  • the actual characteristics are determined by the thickness and volume ratios of the inner microwave reactive layer and the outer non-microwave reactive layer.
  • the outer layer acts as an insulator to slow the heat transmission from the inside of the element to the outside of the heat exchange element.
  • suitable articles and applications which may be employed using alternating microwave visible and microwave invisible layers include therapeutic heating pads wherein one side of the pad is warmer than the opposite side.
  • the warmer side is made of a layer of microwave-visible clay/oil composition and the cooler side is made of a microwave-invisible clay/oil composition as described herein.
  • Other articles may be produced using the layering arrangement described above and illustrated in Figure 4.
  • the central fluid/air flow channel 30 arrangement illustrated in Figure 6 and described above may be used in other applications to flow a fluid such as air or water therethrough to heat same.
  • the microwave heatable layer immediately adjacent to the flowing water transfers heat to the fluid flowing therethrough and the insulating exterior microwave invisible layer provides sufficient insulation therefor.
  • the present invention is not limited to the particularly described clay/oil compositions but further includes various other clay/oil composition proportions which have been heat treated and which have not been heat treated. It should also be understood that the present invention is not limited to the specific compositions or processes described herein and that any composition having a formula equivalent to that described falls within the scope of the present invention.

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  • Thermotherapy And Cooling Therapy Devices (AREA)

Abstract

Cette invention concerne un support d'échange thermique formé d'un mélange d'argile et d'huile servant à absorber, conserver et fournir de la chaleur. La composition ainsi que ses variantes sont le plus efficaces lorsqu'elles ont reçu un traitement thermique ce qui leur permet de réduire la dilatation des gaz lorsque la composition est encapsulée dans un dispositif de conditionnement hermétique. Plus particulièrement, cette composition peut contenir des argiles pouvant être chauffées par des micro-ondes et/ou des argiles invisibles pour les micro-ondes, associées à des huiles invisibles pour les micro-ondes, telles que des huiles minérales ou des huiles pouvant être chauffées par des micro-ondes, telles que des huiles végétales. On peut ajouter plusieurs constituants dans ce support, tels que des fibres formées de susbtances polymères et/ou de tissu, des absorbeurs d'humidité tels que du polyacrylamide, et du plastique tel que du polypropylène et autres. Plusieurs applications du support d'échange thermique sont décrites, ces dernières concernant plus spécifiquement des applications industrielles d'échange thermique et des articles à usage domestique tels que des rouleaux pour les cheveux, des coussinets chauffants, des chaufferettes, comprenant un système de chauffage supplémentaire comportant des niveaux variables de pouvoirs thermiques, et des fibres enrobées dudit support d'échange thermique.
PCT/US1992/004597 1991-05-24 1992-05-22 Support d'echange thermique et articles fabriques avec ce dernier Ceased WO1992020755A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US70553691A 1991-05-24 1991-05-24
US705,536 1991-05-24

Publications (1)

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WO1992020755A1 true WO1992020755A1 (fr) 1992-11-26

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AU (1) AU2161492A (fr)
WO (1) WO1992020755A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5478988A (en) * 1994-01-28 1995-12-26 Thermionics Corporation Thermal exchange composition and articles for use thereof
FR2909545A1 (fr) * 2006-12-07 2008-06-13 Anne Marie Caselli Housse rafraichissante pour des applications cryotherapeutiques.
US9074828B2 (en) 2010-06-23 2015-07-07 Ecopuro, Llc Enhanced boundary layer heat transfer by particle interaction

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Publication number Priority date Publication date Assignee Title
JPS585386A (ja) * 1981-07-02 1983-01-12 Toppan Printing Co Ltd 潜熱蓄熱材組成物
US4538630A (en) * 1983-03-10 1985-09-03 Henderson Gordon W Microwave heated hair curler
SU1452833A1 (ru) * 1986-06-10 1989-01-23 Казанский инженерно-строительный институт Состав дл защиты фундаментов и свай
US4849593A (en) * 1986-10-14 1989-07-18 Hughes Thomas E Microwave-activated heating element
JPH0450285A (ja) * 1990-06-16 1992-02-19 Hiitec Service Kk 蓄熱暖房装置用蓄熱材

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS585386A (ja) * 1981-07-02 1983-01-12 Toppan Printing Co Ltd 潜熱蓄熱材組成物
US4538630A (en) * 1983-03-10 1985-09-03 Henderson Gordon W Microwave heated hair curler
SU1452833A1 (ru) * 1986-06-10 1989-01-23 Казанский инженерно-строительный институт Состав дл защиты фундаментов и свай
US4849593A (en) * 1986-10-14 1989-07-18 Hughes Thomas E Microwave-activated heating element
JPH0450285A (ja) * 1990-06-16 1992-02-19 Hiitec Service Kk 蓄熱暖房装置用蓄熱材

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Title
PATENT ABSTRACTS OF JAPAN 25 February 1991 *
WORLD PATENTS INDEX LATEST Derwent Publications Ltd., London, GB; AN 83-18414K & JP,A,58 005 386 (TOPPAN) 12 January 1983 *
WORLD PATENTS INDEX LATEST Derwent Publications Ltd., London, GB; AN 89-322262 & SU,A,1 452 833 (KAZAN ENG CONS INST) 23 January 1989 cited in the application *
WORLD PATENTS INDEX LATEST Derwent Publications Ltd., London, GB; AN 92-109248 & JP,A,4 050 285 (HITEC) 19 February 1992 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5478988A (en) * 1994-01-28 1995-12-26 Thermionics Corporation Thermal exchange composition and articles for use thereof
FR2909545A1 (fr) * 2006-12-07 2008-06-13 Anne Marie Caselli Housse rafraichissante pour des applications cryotherapeutiques.
US9074828B2 (en) 2010-06-23 2015-07-07 Ecopuro, Llc Enhanced boundary layer heat transfer by particle interaction

Also Published As

Publication number Publication date
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