[go: up one dir, main page]

WO2005068322A1 - Structure de suscepteur de micro-ondes hautes temperatures - Google Patents

Structure de suscepteur de micro-ondes hautes temperatures Download PDF

Info

Publication number
WO2005068322A1
WO2005068322A1 PCT/US2003/041855 US0341855W WO2005068322A1 WO 2005068322 A1 WO2005068322 A1 WO 2005068322A1 US 0341855 W US0341855 W US 0341855W WO 2005068322 A1 WO2005068322 A1 WO 2005068322A1
Authority
WO
WIPO (PCT)
Prior art keywords
base layer
coating
microwave
layer
carbon
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/US2003/041855
Other languages
English (en)
Inventor
Nicole L. Blankenbeckler
Cheng-Hang Chi
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.)
EIDP Inc
Original Assignee
EI Du Pont de Nemours and Co
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 EI Du Pont de Nemours and Co filed Critical EI Du Pont de Nemours and Co
Priority to AU2003304706A priority Critical patent/AU2003304706A1/en
Priority to PCT/US2003/041855 priority patent/WO2005068322A1/fr
Publication of WO2005068322A1 publication Critical patent/WO2005068322A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D81/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D81/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package
    • B65D81/3446—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within the package specially adapted to be heated by microwaves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2581/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D2581/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within
    • B65D2581/3437—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within specially adapted to be heated by microwaves
    • B65D2581/3439—Means for affecting the heating or cooking properties
    • B65D2581/344—Geometry or shape factors influencing the microwave heating properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2581/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D2581/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within
    • B65D2581/3437—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within specially adapted to be heated by microwaves
    • B65D2581/3439—Means for affecting the heating or cooking properties
    • B65D2581/3448—Binders for microwave reactive materials, e.g. for inks or coatings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2581/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D2581/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within
    • B65D2581/3437—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within specially adapted to be heated by microwaves
    • B65D2581/3463—Means for applying microwave reactive material to the package
    • B65D2581/3464—Microwave reactive material applied by ink printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2581/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D2581/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within
    • B65D2581/3437—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within specially adapted to be heated by microwaves
    • B65D2581/3471—Microwave reactive substances present in the packaging material
    • B65D2581/3483—Carbon, carbon black, or graphite
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D2581/00—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents
    • B65D2581/34—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within
    • B65D2581/3437—Containers, packaging elements, or packages, for contents presenting particular transport or storage problems, or adapted to be used for non-packaging purposes after removal of contents for packaging foodstuffs or other articles intended to be cooked or heated within specially adapted to be heated by microwaves
    • B65D2581/3486—Dielectric characteristics of microwave reactive packaging
    • B65D2581/3494—Microwave susceptor

Definitions

  • This invention relates to a high temperature microwave susceptor structure comprising a microwave interactive material of carbon deposited on a high temperature nonwoven base layer. Such microwave susceptor structures consistently brown and crisp food cooked in a microwave oven.
  • U.S. Patent 4,892,782 to Fisher discloses the use of fibrous materials such as cotton, cellulose, jute, hemp, acetate, fiberglass, wool, nylon, polyester, aramid, polypropylene, and other polyolefins as base layers for microwave susceptors. Fisher provides examples of suitable base layers such as woven cloth, paper, rayon, Dacron® polyester, cloths woven of Nomex® or Kevlar® aramid fibers, Sontara® spunlaced fabric, and Tyvek® spunbonded olefin sheets for use in microwave applications.
  • Fisher also discloses metals, metal alloys, conductive polymers, poly- and mono- saccharides, and ionically conductive food flavoring agents as useful microwave interactive materials which may be deposited by techniques including vacuum chemical vapor deposition, vacuum metallization, sputtering, and printing. While Fisher discloses that high temperature base layers are desirable, there is no disclosure concerning how one would combine carbon as a microwave interactive material and a base layer to make a microwavable susceptor structure that has sufficient heat to consistently and safely brown, solely from microwave energy, such things as bread and pizza without additives to the bread or pizza dough. Fisher et. al.
  • This invention relates to a structure for cooking or heating food, comprising: a) a nonwoven base layer comprising a polymeric material with glass transition temperature t g greater than 240 degrees Celsius or a melting temperature t m greater than 270 degrees Celsius, and b) a layer of a microwaveable coating, the coating comprising; i) a microwave interactive material of carbon and ii) a binder comprising a silicate or a naturally occurring polymer, or a derivative thereof.
  • the invention further relates to a structure for cooking or heating food, comprising: a) a nonwoven base layer comprising a polymeric material with glass transition temperature t g greater than 240 degrees Celsius or a melting temperature t m greater than 270 degrees Celsius, and b) an intermediate layer comprising a cellulosic polymer, or naturally occurring polymer which is not a cellulosic polymer, or derivative thereof; and c) a layer of a microwaveable coating, the coating comprising; i) a microwave interactive material of carbon, and ii) a binder comprising a silicate or naturally occurring polymer, or a derivative thereof.
  • Figure 1 is an embodiment of this invention comprising a microwave interactive layer deposited on a high temperature base layer, not drawn to scale.
  • Figure 2 is another embodiment of this invention comprising a base layer, intermediate layer, and microwave interactive layer, not drawn to scale.
  • Figure 3 is a layered structure representing a prior art microwave susceptor structure.
  • Figure 4 is a layered structure representing another prior art microwave susceptor structure.
  • This invention relates to a structure for cooking or heating food comprising a nonwoven base layer comprising a polymeric material having a glass transition temperature greater than 240 degrees Celsius or a melting temperature greater than 270 degrees Celsius.
  • the structure is provided with a continuous or discontinuous coating that further comprises a binder and a microwave interactive material.
  • the structure is provided with a coating comprising a binder and a microwave interactive material.
  • Figure 1 shows a structure of this invention comprising a base layer (11 ) and a microwave interactive layer (12) deposited on it.
  • the microwave interactive layer may be continuous or discontinuous.
  • Figure 2 shows an alternative structure of this invention comprising a base layer (21 ), intermediate layer (22), and microwave interactive layer (23) which may be continuous or discontinuous.
  • the intermediate layer fills any pores or gaps in the surface of the base layer, thus providing a more uniform layer upon which the microwave interactive layer is deposited. It is believed the conductivity of the microwave interactive layer is improved resulting in improved efficiency in the conversion of microwave energy into heat. Additionally the inventors believe that an intermediate layer also further improves the safety of the susceptive structure by providing thermal insulation to the base layer further preventing overheating.
  • the intermediate layer preferably comprises materials suitable for food contact. Suitable materials include but are not limited to cellulosic materials, vegetable proteins, animal proteins, or derivatives thereof.
  • Figure 3 is a comparative example from the prior art showing a base layer of paperboard (31 ), an intermediate layer of sodium silicate (32), and microwave interactive layer comprising carbon and sodium silicate (33). This structure is limited to the ignition temperature of paperboard as the maximum safe temperature.
  • Figure 4 is a comparative example from the prior art showing a paperboard base layer (41), an adhesive layer (42), a layer of metal (typically aluminum) (43), and a polyethylene terephthalate barrier layer (44).
  • This multilayered structure is both limited to the ignition temperature of paperboard and requires a barrier layer between the food and adhesive to prevent potentially dangerous chemicals from migrating into the food during heating.
  • the PET film also limits the maximum temperature of the susceptor due to shrinkage of the PET film at about 180 degrees Celsius.
  • the shrinkage causes cracks to form in the film ("crazing") which reduces the ability of the layer of microwave interactive material to convert microwave energy to heat.
  • the base layer comprises a paper that is essentially transparent to microwave radiation.
  • papers useful as the base layer are made from materials that are stable at high temperatures. This provides the layer with dimensional stability at temperatures above 240 degrees Celsius adequate to allow the microwave interactive material to convert a portion of incident microwave energy into heat for the duration necessary to cook a food article.
  • the paper comprises polymeric materials having a glass transition temperature (t g ) of greater than 240 degrees Celsius or a melting temperature (t m ) of greater than 270 degrees Celsius.
  • the glass transition temperature is defined as the temperature below which an amorphous polymer is considered to be a glass.
  • the melting temperature is defined as the temperature at with a material undergoes a phase transition from the solid state to the liquid state.
  • Many polymers contain both regions of crystallinity and amorphous regions. Such polymers normally possess both a (t g ) and a (t m .) Papers are well known in the art and can be made on conventional paper machines. Paper base layers and methods for making such base layers are disclosed in Gross, Kirayoglu, Hesler, and Tokarsky in U.S.
  • nonwoven spunlaced structures made with high temperature fibers are useful as base layers.
  • General methods for the production of spunlaced materials are disclosed in U.S.
  • Base layers of this invention comprise polymeric materials with a (t g ) of greater than 240 degrees Celsius or a(t m ) greater than 270 degrees
  • Suitable materials include but are not limited to aramids, polybenzoxazoles, polybenzothiazoles, and polybenzimidazoles.
  • the base layer comprises aramid fiber. More preferably the base layer comprises para-aramid fiber.
  • aramid is meant a polyamide wherein at least 85% of the amide (-CO-NH--) linkages are attached directly to two aromatic rings.
  • Suitable aramid fibers are described in Man-Made Fibers-Science and
  • Aramid fibers are, also, disclosed in U.S. Pat. Nos. 4,172,938; 3,869,429; 3,819,587;
  • the coating of the invention comprises a binder material and microwave interactive material.
  • Suitable methods include printing techniques such as wet film application, gravure printing, screen printing, and flexographic printing.
  • the deposition technique is one in which the microwave interactive material is deposited from solution.
  • Solutions of microwave interactive coating compositions are typically prepared from substantially non-aggregated particles of the microwave interactive material, a soluble binder, and optional additional processing aids dissolved in a solvent. Suitable processing aids include dispersing aids, biocides, pH modifiers, or defoamers. The particles of microwave interactive material tend to agglomerate and form aggregates.
  • the microwave interactive material is treated during the manufacture of the coating composition, preferably by milling in water, to reduce the size and number of aggregates. Therefore, by substantially non-aggregated it is meant the particulate microwave interactive material has been mechanically or otherwise treated to de-agglomerate a majority of the aggregates formed by the microwave interactive material.
  • the coating compositions used in this invention have a high solids content and preferably do not contain any additives used expressly to attenuate or reduce the heat generated by the carbon from the microwave radiation.
  • the solids content of the coating composition is greater than 20 percent and generally in the range of 22 to 26 percent or higher based on whether or not a surfactant is included with the microwave susceptor and the binder polymer. If the coating composition is to be used in a screen printing process, the solids content of the coating composition is greater than 25 percent and generally in the range of 35 percent or higher, based on whether or not a surfactant and/or a humectant is included with the microwave susceptor and the binder polymer.
  • the coating compositions used in this invention have a fluid viscosity suitable for them to be printed onto substrates, and the viscosity is highly dependent on the printing process. For screen printing a viscosity of about 5,000 centipoise or greater is desired, while for gravure printing a viscosity of about 500 centipoise or less is desired.
  • the coating composition can contain additives that maintain shelf- life or assist in the printing process. For example, since natural polymers are used a biocide may need to be added to prevent souring of the ink.
  • the coating composition can also be tailored for the printing process that is to be used, for example, to make a screen printing ink a humectant can be added to decrease drying rate and improve screen life.
  • These coating compositions are preferably printed or coated onto a substrate in such quantity so as to create a cooking surface on that substrate that has in excess of 35 weight percent microwave susceptor particles that are both substantially non-aggregated and uniformly dispersed in the natural polymer binder.
  • the microwave interactive coating comprises 30 to 75 parts by weight of binder and 25 to 70 parts by weight of microwave interactive material.
  • the coating comprises 40 to 65 parts by weight of binder and 35 to 60 parts by weight of microwave interactive material.
  • a continuous layer is a layer in which the layer is uninterrupted.
  • a discontinuous layer is a layer which is not continuous.
  • a discontinuous layer may be discontinuous in uniformity with interruptions or may have a number of individual, discrete areas (which may be uniform or non-uniform in the layer).
  • the binder comprises a material that is capable of being doped or coated with a microwave interactive material and deposited on a base layer.
  • a desirable binder will preferably be soluble in water or alcohols, able to withstand temperatures above 200 degrees Celsius without changing phase, able to withstand temperatures above 200 degrees Celsius without rapid decomposition, safe for contact with food, and be electrically non-conductive or semi-conductive.
  • Suitable binders include but are not limited to polysaccharides, such as cellulose derivatives, starch and starch derivatives, gums and derivatized gums, algins and derivatives, carrageenans, agars, furcellarans, chitin and chitosan; plant proteins such as soy or legume protein; animal proteins such as fish protein or collagen; and silicates such as sodium silicate.
  • the binder is a naturally occurring polymer such as a plant protein.
  • the preferred binder is soy protein or derivative thereof.
  • the microwave interactive material of the invention comprises carbon such as in the form of carbon fiber or carbon black, or graphite. Carbon based interactive materials are easily processed and deposited.
  • Carbon based inks are well known in the art and common printing techniques such as screen, gravure, and flexographic printing are used to deposit carbon based solutions.
  • Microwave interactive coatings of carbon based materials allow for easily customizable coating thicknesses, concentrations, and patterns.
  • Carbon based microwave interactive materials are in addition easily milled to control the particle size distribution, and carbon / binder compositions are easily solublized or suspended in common solvents such as water and alcohols allowing efficient handling.
  • This invention may include a process for making a structure for microwave cooking comprising providing a base layer comprising a paper, wherein the paper further comprises a polymeric material with glass transition temperature t g greater than 240 degrees Celsius or a melting temperature t m greater than 270 degrees Celsius, and depositing a continuous or discontinuous microwave interactive coating on said base layer, wherein the coating comprises a binder comprising a cellulosic, or naturally occurring material, or derivative thereof, and the microwave interactive material comprises carbon such as carbon fiber, carbon black, and graphite.
  • This invention also includes a process for making a alternative structure for microwave cooking comprising providing a base layer, depositing an intermediate layer on said base layer, wherein the intermediate layer comprises a silicate, a naturally occurring material, or a derivative thereof, and depositing a continuous or discontinuous microwave interactive coating on said intermediate layer, wherein the coating comprises a binder comprising a cellulosic, or naturally occurring material, or derivative thereof, and the microwave interactive material is carbon, carbon fiber, carbon black; and graphite.
  • the invention also relates to a method for microwaving food in contact with the structure of the invention by providing a microwaveable structure comprising a base layer and a microwave interactive coating, placing a food article in contact with the microwave interactive coating, applying microwave energy to the food and said structure of sufficient intensity to cook the food.
  • Microwave heating effectiveness was measured by use of an oil/water competition test. This test gives a quantitative measure of heating power for different susceptors by cooking oil in a glass beaker above a susceptor in competition with a water-filled beaker without susceptor. The microwave and apparatus used in this test has been shown to give a 7.8 degree rise in temperature without a susceptor (or with an uncoated dielectric substrate). For susceptive-coated samples, the temperature rise of the oil in excess of 7.8 degrees for a 60 second test run shows a functioning susceptor.
  • test conditions serve as a useful proxy for imperfect food contact or for overcooking excursions with food because of the harshness of the test-since there is some thermal lag within the glass and imperfect contact of susceptor to glass because of beaker geometry (slightly concave bottom).
  • 100 grams of Type 710 oil was placed in a 250 mL beaker.
  • 400 mL of distilled water was placed in a 600 mL beaker.
  • a 4.1 cm circle was cut from the test microwavable substrate material. The oil and water initial temperature was measured and recorded.
  • Both beakers were placed in a Emerson 900 Watts, Model Number MW8987B microwave oven with the water beaker placed to one side and oil beaker sitting on the microwavable substrate (with the active side of the microwavable substrate facing towards the oil beaker bottom).
  • the oil beaker should be centered on the microwavable substrate and centered in the microwave on the turntable.
  • the microwave was then run on high heat for 1 minute and 3 seconds. The sample was monitored and if flames or arcing appeared the test was stopped. Once time has expired (or test stopped) the temperature of the oil (first) and then the water was measured and recorded.
  • the microwavable substrate was examined for signs of arcing (jagged, burned out lines), which were noted if present. The difference between the oil start and finish temperature was calculated.
  • Example 1 Aramid with Carbon-Soy A dispersion aid, water and defoamer were mixed together with a Cowles blade at 1000 rpm. Carbon black was then added while under agitation and allowed to mix at 2000 rpm for 2 hours. The carbon dispersion was milled in a horizontal media mill. Milling was done with 0.8-1.0 mm zirconia media and ceramic agitator operating at a tip speed of 2400 feet per minute for a batch residence time of 62 minutes. Water was then mixed into the milled dispersion at low speed. Ammonium hydroxide was then added to raise the pH of the mixture above 10.0. A soy-carbon ink was then prepared.
  • Soy protein (Procote 2500) and ammonium hydroxide were added in aliquots of 10g protein followed by 1.5 g ammonium hydroxide until the formula amount of protein was mixed in.
  • the mixing speed was increased to a point that provided a stable mixing vortex without excessive air entrainment, and the mixture was mixed at this higher speed for 1 hour.
  • Mixing speed was then reduced and the mixture pH was adjusted above 9.5 with ammonium hydroxide; glycerin, biocide (Proxel GXL), and remaining water were added with mixing, and the mixture was mixed for an additional 15 minutes.
  • a coated microwave susceptor was prepared.
  • the substrate used was a sheet of 30 cm length by 30 cm width, 0.1 mm thickness aramid paper (Type 4N710 from DuPont).
  • a uniform base coat of 0.127 mm (5 mils) wet film thickness was first applied to the substrate using a wet film applicator available from Paul N. Gardner Company.
  • the composition of the base coat was 14.7% modified soy protein (Pro-cote 200 from Bunge), 1.1 % glycerin, 0.74% ammonia, and 83.46% water.
  • the coated sheet was dried in a 100 degree C oven for 15 minutes.
  • a second coating of microwave susceptor ink (prepared and of the composition listed above was applied using the wet film applicator at a 5 mil wet thickness.
  • the sheet was dried for 30 minutes in a 100 degree C oven. Oil and beaker tests were run on cut samples from the sheet with results in Table 1.
  • EXAMPLE 2 Aramid with Carbon -Sodium Silicate
  • a sample of carbon dispersion similar to that of Example 1 was mixed with commercial sodium silicate (Oxychem 40 Clear) in appropriate amounts to achieve an equal weight percentage of carbon and (dry) sodium silicate, using hand stirring.
  • a coated susceptor sheet was prepared by depositing a wet 5 mil coating of sodium-silicate-carbon ink onto a sheet of aramid paper (Type 4N710 from DuPont) with the applicator of Example 1. The sheet was dried for 30 minutes in a 100 degree C oven. Oil and beaker heating tests were run on cut samples with the results in Table 1.
  • EXAMPLE 3 Cellulose with carbon-soy A cellulose paper was prepared. Cellulose pulp was placed in a
  • Waring Blendor with 800 ml of water and was agitated for 5 min.
  • the slurry was poured, with 4 additional liters of water, into an approximately 21 x 21 cm handsheet mold and a wet-laid sheet was formed.
  • the sheet was placed between two pieces of blotting paper, hand couched with a rolling pin, and dried in a handsheet dryer at 180°C.
  • the resultant sheet had a basis weight of 1.3 ounces per square yard.
  • the sheet was precoated with 4 mil of soy solution, dried and then coated with 5 mil of carbon-soy ink in the manner of Example 1. Oil and beaker heating tests were performed on cut samples with the results in Table 1.
  • EXAMPLE 4 Cellulose-Para-Aramid with carbon-sov A para-aramid-cellulose paper was prepared.
  • Cellulose pulp was placed in a Waring Blendor with 800 ml of water and was agitated for 5 min. After that the slurry of cellulose pulp was mixed with p-aramid pulp (25/75 weight percent of cellulose to para-aramid) in a laboratory mixer (British pulp evaluation apparatus) with about 1600 g of water. After agitating for 2 min., the final slurry was prepared. The slurry was poured, with 4 additional liters of water, into an approximately 21 x 21 cm handsheet mold and a wet-laid sheet was formed.
  • the sheet was placed between two pieces of blotting paper, hand couched with a rolling pin, and dried in a handsheet dryer at 180°C. Calendering was conducted between two metal rolls (20.3 cm diameter each) at room temperature and linear pressure of about 2800 N/cm. The resultant sheet had a 2.6 ounce per square yard basis weight.
  • the sheet was precoated with 4 mil of soy solution, dried and then coated with 5 mil of carbon-soy ink in the manner of Example 1. Oil and beaker heating tests were performed on cut samples with the results in Table 1.
  • PET with carbon-sov A commercial nonwoven sheet of PET (1.8 ounces per square yard basis weight) was coated with 4 mils of carbon-soy ink in the manner of Example 1 and dried for 30 minutes in a 100 degree oven. Oil and beaker heating tests were performed on cut samples with the results in Table 1.
  • blended high temperature materials e.g. aramid/ polybenzoxazole
  • carbon-binder coated susceptor with acceptable thermal endurance.
  • blended high temperature materials might also have up to 25% of a lower temperature thermal endurance material (e.g. cellulose or PET) in an analogous manner to the para-aramid/cellulose blend.
  • a lower temperature thermal endurance material e.g. cellulose or PET
  • Such addition might be useful for cost reduction or for creating a sheet structure itself (e.g. binding substrate sheet fibers) or to improve sheet properties such as porosity, printability, or dimensional stability.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Food Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

L'invention concerne une structure de suscepteur de micro-ondes hautes températures comprenant un matériau interactif micro-ondes (12) en carbone à polymère d'occurrence naturelle ou un dérivé et une couche de base (11) en papier réfractaire.
PCT/US2003/041855 2003-12-31 2003-12-31 Structure de suscepteur de micro-ondes hautes temperatures Ceased WO2005068322A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU2003304706A AU2003304706A1 (en) 2003-12-31 2003-12-31 High temperature microwave susceptor structure
PCT/US2003/041855 WO2005068322A1 (fr) 2003-12-31 2003-12-31 Structure de suscepteur de micro-ondes hautes temperatures

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2003/041855 WO2005068322A1 (fr) 2003-12-31 2003-12-31 Structure de suscepteur de micro-ondes hautes temperatures

Publications (1)

Publication Number Publication Date
WO2005068322A1 true WO2005068322A1 (fr) 2005-07-28

Family

ID=34793620

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2003/041855 Ceased WO2005068322A1 (fr) 2003-12-31 2003-12-31 Structure de suscepteur de micro-ondes hautes temperatures

Country Status (2)

Country Link
AU (1) AU2003304706A1 (fr)
WO (1) WO2005068322A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009152120A3 (fr) * 2008-06-09 2010-03-11 Graphic Packaging International, Inc. Structure interagissant avec l’énergie des micro-ondes dotée de micro-ouvertures
US8658952B2 (en) 2009-04-28 2014-02-25 Graphic Packaging International, Inc. Vented susceptor structure

Citations (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2451915A (en) 1946-05-01 1948-10-19 George F Buresh Machine and method for forming fiber webs
US2700188A (en) 1948-05-11 1955-01-25 Curlator Corp Fiber web forming machine
US2703441A (en) 1951-02-02 1955-03-08 Curlator Corp Machine for forming composite fiber webs
US3094511A (en) 1958-11-17 1963-06-18 Du Pont Wholly aromatic polyamides
US3354127A (en) 1966-04-18 1967-11-21 Du Pont Aromatic copolyamides
US3485706A (en) 1968-01-18 1969-12-23 Du Pont Textile-like patterned nonwoven fabrics and their production
US3673143A (en) 1970-06-24 1972-06-27 Du Pont Optically anisotropic spinning dopes of polycarbonamides
US3756908A (en) 1971-02-26 1973-09-04 Du Pont Synthetic paper structures of aromatic polyamides
US3819587A (en) 1969-05-23 1974-06-25 Du Pont Wholly aromatic carbocyclic polycarbonamide fiber having orientation angle of less than about 45{20
US3869429A (en) 1971-08-17 1975-03-04 Du Pont High strength polyamide fibers and films
US4172938A (en) 1976-06-23 1979-10-30 Teijin Limited Process for producing polyamides with lactam or urea solvent and CaCl2
US4698267A (en) 1985-09-17 1987-10-06 E. I. Du Pont De Nemours And Company High density para-aramid papers
US4729921A (en) 1984-10-19 1988-03-08 E. I. Du Pont De Nemours And Company High density para-aramid papers
EP0287323A2 (fr) * 1987-04-13 1988-10-19 E.I. Du Pont De Nemours And Company Matériel fibreux sensible aux micro-ondes pour emballage
US4891262A (en) 1987-12-16 1990-01-02 Asahi Kasei Kogyo Kabushiki Kaisha High strength wet-laid nonwoven fabric and process for producing same
US4902564A (en) 1988-02-03 1990-02-20 James River Corporation Of Virginia Highly absorbent nonwoven fabric
EP0357008A2 (fr) * 1988-09-01 1990-03-07 James River Corporation Of Virginia Compositions de revêtement et éléments chauffants sensibles aux micro-ondes
EP0365729A2 (fr) * 1988-10-24 1990-05-02 Golden Valley Microwave Foods Inc. Feuilles stratifiées chauffables par micro-ondes
US4959516A (en) * 1988-05-16 1990-09-25 Dennison Manufacturing Company Susceptor coating for localized microwave radiation heating
US5026456A (en) 1990-06-14 1991-06-25 E. I. Du Pont De Nemours And Company Aramid papers containing aramid paper pulp
US5223094A (en) 1992-05-13 1993-06-29 E. I. Du Pont De Nemours And Company Process for preparing strong aromatic polyamide papers of high porosity
US5240764A (en) 1992-05-13 1993-08-31 E. I. Du Pont De Nemours And Company Process for making spunlaced nonwoven fabrics
US5314742A (en) 1993-03-31 1994-05-24 E. I. Du Pont De Nemours And Company Resin impregnated laminate for wiring board applications
US5410135A (en) * 1988-09-01 1995-04-25 James River Paper Company, Inc. Self limiting microwave heaters
US5910231A (en) 1997-07-22 1999-06-08 E. I. Du Pont De Nemours And Company Aramid papers of improved solvent resistance and dimensionally stable laminates made therefrom
US6066375A (en) * 1997-04-10 2000-05-23 Fort James Corporation Coated paperboard and paperboard containers having a microwave interactive layer which emits none or very low amounts of benzene in microwave applications

Patent Citations (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2451915A (en) 1946-05-01 1948-10-19 George F Buresh Machine and method for forming fiber webs
US2700188A (en) 1948-05-11 1955-01-25 Curlator Corp Fiber web forming machine
US2703441A (en) 1951-02-02 1955-03-08 Curlator Corp Machine for forming composite fiber webs
US3094511A (en) 1958-11-17 1963-06-18 Du Pont Wholly aromatic polyamides
US3354127A (en) 1966-04-18 1967-11-21 Du Pont Aromatic copolyamides
US3485706A (en) 1968-01-18 1969-12-23 Du Pont Textile-like patterned nonwoven fabrics and their production
US3819587A (en) 1969-05-23 1974-06-25 Du Pont Wholly aromatic carbocyclic polycarbonamide fiber having orientation angle of less than about 45{20
US3673143A (en) 1970-06-24 1972-06-27 Du Pont Optically anisotropic spinning dopes of polycarbonamides
US3756908A (en) 1971-02-26 1973-09-04 Du Pont Synthetic paper structures of aromatic polyamides
US3869429A (en) 1971-08-17 1975-03-04 Du Pont High strength polyamide fibers and films
US4172938A (en) 1976-06-23 1979-10-30 Teijin Limited Process for producing polyamides with lactam or urea solvent and CaCl2
US4729921A (en) 1984-10-19 1988-03-08 E. I. Du Pont De Nemours And Company High density para-aramid papers
US4698267A (en) 1985-09-17 1987-10-06 E. I. Du Pont De Nemours And Company High density para-aramid papers
EP0287323A2 (fr) * 1987-04-13 1988-10-19 E.I. Du Pont De Nemours And Company Matériel fibreux sensible aux micro-ondes pour emballage
US4892782A (en) 1987-04-13 1990-01-09 E. I. Dupont De Nemours And Company Fibrous microwave susceptor packaging material
US4891262A (en) 1987-12-16 1990-01-02 Asahi Kasei Kogyo Kabushiki Kaisha High strength wet-laid nonwoven fabric and process for producing same
US4902564A (en) 1988-02-03 1990-02-20 James River Corporation Of Virginia Highly absorbent nonwoven fabric
US4959516A (en) * 1988-05-16 1990-09-25 Dennison Manufacturing Company Susceptor coating for localized microwave radiation heating
US5410135A (en) * 1988-09-01 1995-04-25 James River Paper Company, Inc. Self limiting microwave heaters
EP0357008A2 (fr) * 1988-09-01 1990-03-07 James River Corporation Of Virginia Compositions de revêtement et éléments chauffants sensibles aux micro-ondes
EP0365729A2 (fr) * 1988-10-24 1990-05-02 Golden Valley Microwave Foods Inc. Feuilles stratifiées chauffables par micro-ondes
US5026456A (en) 1990-06-14 1991-06-25 E. I. Du Pont De Nemours And Company Aramid papers containing aramid paper pulp
US5223094A (en) 1992-05-13 1993-06-29 E. I. Du Pont De Nemours And Company Process for preparing strong aromatic polyamide papers of high porosity
US5240764A (en) 1992-05-13 1993-08-31 E. I. Du Pont De Nemours And Company Process for making spunlaced nonwoven fabrics
US5314742A (en) 1993-03-31 1994-05-24 E. I. Du Pont De Nemours And Company Resin impregnated laminate for wiring board applications
US6066375A (en) * 1997-04-10 2000-05-23 Fort James Corporation Coated paperboard and paperboard containers having a microwave interactive layer which emits none or very low amounts of benzene in microwave applications
US5910231A (en) 1997-07-22 1999-06-08 E. I. Du Pont De Nemours And Company Aramid papers of improved solvent resistance and dimensionally stable laminates made therefrom

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009152120A3 (fr) * 2008-06-09 2010-03-11 Graphic Packaging International, Inc. Structure interagissant avec l’énergie des micro-ondes dotée de micro-ouvertures
US9936542B2 (en) 2008-06-09 2018-04-03 Graphic Packaging International, Llc Microwave energy interactive structure with venting microapertures
US8658952B2 (en) 2009-04-28 2014-02-25 Graphic Packaging International, Inc. Vented susceptor structure
US9066375B2 (en) 2009-04-28 2015-06-23 Graphic Packaging International, Inc. Vented susceptor structure

Also Published As

Publication number Publication date
AU2003304706A1 (en) 2005-08-03

Similar Documents

Publication Publication Date Title
US5002826A (en) Heaters for use in microwave ovens
CA1162357A (fr) Materiaux fibreux composites, leur production et leur emploi
US4429216A (en) Conductive element
US20020058179A1 (en) Electrical conducting, non-woven textile fabric
WO1997021865A1 (fr) Tissu abrasif non tisse en nappe et son procede de fabrication
CN201817744U (zh) 一种多层复合的发热导电纳米碳纤维纸
Yan et al. Construction of multilayer coatings for flame retardancy of ramie fabric using layer‐by‐layer assembly
JP4866332B2 (ja) 水膨潤性フィブリル化繊維及びそれを用いたシート状物
JPH08169478A (ja) マイクロ波加熱調理用発熱シート及びその製造方法
US4442139A (en) Elements comprising fibrous materials
JP2010093027A (ja) 電極部材−集電極部材積層体
US20050148265A1 (en) High temperature microwave susceptor structure
CA1153413A (fr) Elements conducteurs, et methode de production connexe
WO2005068322A1 (fr) Structure de suscepteur de micro-ondes hautes temperatures
JP3777711B2 (ja) 薄葉多孔紙
US4678700A (en) Fibrous composite materials
JP2002159809A (ja) 食用油の再生用フィルター
CN116285478B (zh) 一种玄武岩无机长晶鳞片防火涂料及其制备方法
US20050142255A1 (en) Method of heating a food
WO1998044197A1 (fr) Tole de fibres metalliques/de poudre metallique et son procede de fabrication
WO2005068567A1 (fr) Procédé pour chauffer un aliment
US20060000828A1 (en) Microwave susceptor for food packaging
US20020039663A1 (en) Metal fiber sheet and method of making same
KR20210062811A (ko) 고전도성 탄소섬유 종이의 제조방법, 이에 따라 제조된 탄소섬유 종이 및 탄소섬유 종이를 포함하는 탄소섬유 면상발열체
JP3646239B2 (ja) 空調フィルタ用セパレータ用紙

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BR BW BY BZ CA CH CN CO CR CU CZ DE DK DM DZ EC EE EG ES FI GB GD GE GH GM HR HU ID IL IN IS JP KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX MZ NI NO NZ OM PG PH PL PT RO RU SC SD SE SG SK SL SY TJ TM TN TR TT TZ UA UG US UZ VC VN YU ZA ZM ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): BW GH GM KE LS MW MZ SD SL SZ TZ UG ZM ZW AM AZ BY KG KZ MD RU TJ TM AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LU MC NL PT RO SE SI SK TR BF BJ CF CG CI CM GA GN GQ GW ML MR NE SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

WWW Wipo information: withdrawn in national office

Country of ref document: DE

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: JP