US3699976A - Method for killing tobacco leaf bug inhabitants and their eggs - Google Patents

Method for killing tobacco leaf bug inhabitants and their eggs Download PDF

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Publication number
US3699976A
US3699976A US6144A US3699976DA US3699976A US 3699976 A US3699976 A US 3699976A US 6144 A US6144 A US 6144A US 3699976D A US3699976D A US 3699976DA US 3699976 A US3699976 A US 3699976A
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United States
Prior art keywords
tobacco
microwave
high frequency
tobacco leaf
vegetable matter
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Expired - Lifetime
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US6144A
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English (en)
Inventor
Isao Abe
Tatsuo Hirose
Kotaro Ohshima
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Toshiba Corp
Japan Monopoly Corp
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Japan Monopoly Corp
Tokyo Shibaura Electric Co Ltd
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
    • A01M1/00—Stationary means for catching or killing insects
    • A01M1/22—Killing insects by electric means
    • A01M1/226—Killing insects by electric means by using waves, fields or rays, e.g. sound waves, microwaves, electric waves, magnetic fields, light rays
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B15/00—Chemical features or treatment of tobacco; Tobacco substitutes, e.g. in liquid form
    • A24B15/18—Treatment of tobacco products or tobacco substitutes
    • A24B15/183—Treatment of tobacco products or tobacco substitutes sterilization, preservation or biological decontamination
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B15/00—Chemical features or treatment of tobacco; Tobacco substitutes, e.g. in liquid form
    • A24B15/18—Treatment of tobacco products or tobacco substitutes
    • A24B15/22—Treatment of tobacco products or tobacco substitutes by application of electric or wave energy or particle radiation
    • A—HUMAN NECESSITIES
    • A24—TOBACCO; CIGARS; CIGARETTES; SIMULATED SMOKING DEVICES; SMOKERS' REQUISITES
    • A24B—MANUFACTURE OR PREPARATION OF TOBACCO FOR SMOKING OR CHEWING; TOBACCO; SNUFF
    • A24B3/00—Preparing tobacco in the factory
    • A24B3/18—Other treatment of leaves, e.g. puffing, crimpling, cleaning
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/64—Heating using microwaves
    • H05B6/78—Arrangements for continuous movement of material
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01M—CATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
    • A01M2200/00—Kind of animal
    • A01M2200/01—Insects
    • A01M2200/012—Flying insects

Definitions

  • PATENTEDnmzmvz I -3 sum 5 or 8 INVNTOR BY M N W rmwem PATENTEDnm 24 I972 sum am a FIG. 5B
  • This invention relates to a method and apparatus for heat treating vegetable matter such as tobacco to kill bugs inhabiting said matter, for example, moths and beetles, and to upgrade its quality.
  • dried rush is'inhabited by harmful bugs, for' example, mite, including the larvae and eggs, and tobacco leaves by tobacco moths or cigarette beetles, thus exerting various undesirable; effects on such products when they are manufactured or stored.
  • harmful bugs for' example, mite, including the larvae and eggs
  • tobacco leaves by tobacco moths or cigarette beetles, thus exerting various undesirable; effects on such products when they are manufactured or stored.
  • such effects even extend to men using it.
  • the eggs of the aforesaid bugs present in the tobacco leaves will grow into larvae or imagoes after the leaves are made into product to eat the circumjacent zone of the preservation and deteriorate the quality of the product due to the resultant exhaustion of raw material.
  • Tests were conducted in applying high frequency electromagnetic'waves to exterminate bugs inhabiting the leaves of tobacco (the term bugs is construed hereinafter to include their pupae, larvae and eggs).
  • Past experiments involving application of high frequency electromagnetic waves sometimes failed to kill the aforesaid bugs while degrading the quality of the vegetable matter.
  • the particular problem is that there appear small electrical discharges on the surface of vegetable matter when high frequency electromagnetic waves are applied thereon, decomposing or oxidizing the vegetable matter'with the resultant deterioration of its quality. Accordingly, dried rush is partly carbonized by such discharges and reduced in physical strength, The same phenomenon is also observed in tobacco, namely, tobacco leaf is partly carbonized with the tobacco sauce or flavor impregnated therein, making its quality quite useless.
  • the aforesaid discharge scorches or even burns thetobacco, preventing the treating apparatus from .being used continuously and making its operation unstable.
  • Table 1 shows the death rate of the larvae of cigarette beetles by heat treatment under dry condition.
  • full extermination of bugs requires heat treatment for about 5 min at a temperature of 60C.
  • heating method involves problems in that it is practically difficult to fully treat large amounts of raw material under the aforesaid conditions during the making of cigarettes.
  • elevation of heating temperature to as high a level as 60C adversely affects the smoking taste of cigarettes.
  • said heating method has heretoforebeen barred from use.
  • An object of the present invention is to provide a method for improving the quality of vegetable matter by applying electromagnetic waves to said vegetable matter with the least possible deterioration of quality.
  • the apparatus of the present invention basically consists of a means for irradiating highfrequency electromagnetic waves of 900 MHz min. on vegetable matter and additionally of an infrared ray oven means and high frequency electromagnetic wave absorption means.
  • FIG. 1 is a principle sectional view of the main section of an apparatus for heat treating vegetable matter according to the present invention
  • FIGS. 2A and 2B jointly illustrate said apparatus according to an embodiment of the invention
  • FIG. 2A is a front view of said apparatus and
  • FIG. 2B is a side view of said microwave oven means;
  • FIG. 3 is a cross sectional view of an infrared ray oven means involved in the apparatus of FIG. 2;
  • FIG. 4' is a frontsectional view of said infrared ray oven means involved in the apparatus of FIG. 2,
  • FIGS. 5A and 5B are respectively a cross sectional view and front view partly in section of a microwave absorption means according to an embodiment of the invention.
  • FIGS. 6A and 6B are respectively a cross sectional view and sectional front view of a microwave oven means involved in the apparatus of FIG. 2.
  • the present invention involves a. considerably high frequency.
  • an electromagnetic field of high frequency has a relatively low intensity as compared with the magnitude of power applied thereto and is free from local discharges which might result when the field strength is increased.
  • the present invention enables vegetable matter requiring an insecticidal treatment to be sub jected to a sufficient amount of high frequency power to display an insecticidal effect without causing the quality of said matter to be deteriorated by the aforementioned local discharges.
  • Such a relatively high frequency for industrial application is generally of the order of 900 MHz min.
  • a waveguide 2 on a box member 1 constructed of a material capable of reflecting electromagnetic waves, for example, a metal by the aid of a slightly flared connection member 3 fitted with said guide 2.
  • an oscillator 40 of high frequency electromagnetic waves such as a magnetron, which applies pulsed or continuous waves into the box.
  • Said box member 1 contains a tray 4 for receiving vegetable matter. Said tray is desired to be made of such material as will cause little loss of high frequency current, that is, ta'n8 has a small value even when the temperature within'said box member 1 slightly rises, for example, to
  • absorption means 20 is provided a support plate 16 shown in' FIG. 3 for supporting said conveyor belt 12 from below so as to prevent it from sagging while it travels through these means.
  • Said support plate 16 should have substantially the same electrical and thermal properties as said conveyor belt 12 and additionally a considerable mechanical strength.
  • said plate preferably consists of, for example, polypropylene resin.
  • a flexible insulation member 13 preferably made of fluorine resin ina manner to abut against both sides of said'conveyor belt 12 to prevent tobacco shreds from falling off said belt 12.
  • Said insulation member 13 is further fixed to another insulation member 14 for guiding tobacco shreds carried by said conveyor belt 12 (a plate about 10 mm thick preferably made of polypropylene).
  • Said second insulation member 14 is fitted to the frame 8 by a metal support 15 (FIG. 3). I v
  • Vegetable matter is put on said conveyor belt 12 at 6 the right end of the apparatus as shown in FIG. 2A.
  • infrared rays oven means 17 to prevent the temperature of its surface from falling (.due to evaporation of water or the like from said surface).
  • Said infrared rays oven means- 17 has infrared rays lamps 27 and reflection shades 27a positioned ,on the underside of its top wall so as to supply the surface of said vegetable matter with infrared rays heat. While the number of said infrared rays lamps 27 and power consumption naturally vary with the speed at which said conveyor belt 12 travels, use of three such lamps with lKW attains the object of preheating in this case. Of course, the greater the speed of said conveyor belt 12, the more infrared rays lamps will be required.
  • Part of the bottom cover plate of said infrared rays oven means 17 is made detachable and is provided with a handle for its removal. The vegetable field intensity),then a frequency f of 900 X 10 Hz min.
  • FIGS. 2A and 2 B the present invention provides an apparatus jointly illustrated by FIGS. 2A and 2 B.
  • Infrared rays oven means 17, microwave absorption means 18, microwave oven means 19 and microwave absorption means 20 v Q a are all supported on a frame 8.
  • a motor 9 equipped with a reduction gear To'the output side of said frame 8 is fitted a motor 9 equipped with a reduction gear. Outputs from said motor 9 are transmitted a matter which has been treated to prevent its surface temperature from falling is conducted to a high frequency electromagnetic field section (hereinafter referred to as the microwave oven means 19"). If, in this case, said microwave oven means 19 ispositioned adjacent to said infrared rays oven means 17, then I there would occur undesirable effects, for example,
  • infrared rays lamps 27 would be unnecessarily heated by the high frequency field-of said microwave oven means 19 to reducetheir life or the vegetable matter would be unduly heated. If, to prevent these drawbacks, there is placed a wire net below said infrared rays lamps, it will undesirably absorb infrared rays. Further, part of the high frequency waves used in said microwave oven means 19 will escape outside with the resultant occurrence of various difficulties.
  • the apparatus of the present invention has a microwave absorption means 18 interposed between the outlet of said infrared rays oven means 17 and the inlet of said microwave oven means 19 and another microwave absorption means 20 positioned adjacent to the outlet of 'said microwave oven means 19.
  • each of said microwave absorption means 18 and 20 has a microwave absorption member 37 provided on both sides of that part thereof through which said conveyor belt 12 passes.
  • Said microwave absorption member 37 is cooled with water running therethrough from its inlet 25 to its outlet 26.
  • a detachable cover plate 28 On the top of said microwave absorption means 18 and 20 is formed a detachable cover plate 28 so as to afford convenience in the maintenance of and access to the devices included therein.
  • said cover plate 28 does not tightly contact the box member 1, there will sometimes occur sparks in the interstice therebetween due to migration of microwaves thereto and their leakage from said interstice.
  • a microwave choke 29 which is assembled from the mutually contacting end portions of the adjacent walls of the box member 1 and between box members.
  • the bottom of the box member 1 is located slightly apart from said conveyor belt 12 to allow for the possible heating of the vegetable matter even in said microwave absorption means 18 and 20 by microwaves escaping from said microwave oven means 19.
  • the distance between said bottom of the box member 1 and conveyor belt is preferably more than about one-fourth of the length of microwaves.
  • a detachable cover plate 30 At the bottom of said box member 1 is disposed a detachable cover plate 30 to take out the vegetable matter falling off said conveyor belt 12. .Also at the end of said detachable cover plate 30 is formed a microwave choke 31. 37a is a water level gauge and 37b is a soft polyvinyl chloride tube.
  • the vegetable matter carried through said microwave absorption means 18 by the conveyor belt is brought to said microwave oven means 19.
  • microwave oven means At the inlet and outlet of said microwave oven means there are defined as shown in FIGS. 6A and 6B microwave chokes 32 and 33, respectively by the walls of said oven means 19 with those of said microwave absorption means 18 and 20 adjacent thereto, thereby preventing the occurrence of difficulties due to sparks generated between said oven means 19 and both absorption means 18 and 20.
  • the conveyor belt 12 is set appreciably apart from the bottom of the box member 1 constituting said microwave oven means'19. The interval between said conveyor belt 12 and the bottom of said box member 1 is preferably about one-fourth of the length of microwaves as described above.
  • Microwaves for heating are generated by, for example, a magnetron and introduced into said microwave oven means 19 through the waveguide 21 and the slightly flared connection member 3(FIG. 2B).
  • a stirrer 22 (FIG. 6B) for scattering microwaves to obtain uniform microwave energies at various parts of said oven means 19, said stirrer 22 being rotated by a motor 23 at a proper speed.
  • the upper cover plate 36 (including part of said waveguide 21 and scattering means 22) is detachably fitted for the maintenance of and access to the devices contained in said box member 1.
  • microwave chokes 34 At both ends of said upper cover plate 36 are formed microwave chokes 34 to prevent the leakage of microwaves to the outside and occurrence of sparks due to poor contact between said box member 1 and upper cover plate 36.
  • a microwave oscillator for example, a magnetron does not admit of such a free correspondence of output. It will be rather simple to additionally prepare a separate oscillator or oven of similar type but of different capacity and connect it in series to the original one. It will therefore be advisable to separately fabricate an infrared rays oven means, microwave absorption means and microwave oven means and assemble them in proper combinations. It is also possible to use a suitable combination of microwave oven means generating different frequencies so as to control the treating effect on vegetable matter.
  • .electromagnetic waves of high frequency generally present difiiculties in generating great power.
  • the foregoing description relates to the case where there are employed continuous microwaves.
  • Use of high frequency pulsed electromagnetic waves, for example, will bring about a good ef- 7 feet.
  • it ispossible to use prominently high peak power as compared with the average power applied, thereby realizing a considerably stronger insecticidal effect thanis possible with said average power.
  • the pulsation of microwaves thus used had a width of 2 microseconds and a number of 300 per second and produced a peak power ors MW, obtaining the same izes sharp temperature rise, thereby exterminating bugs by thermal shocks leading to their environmental ineptitude.
  • Various forms of tobacco leaf tobacco, shredded tobacco,'cigarettes and packaged cigarettes) said bugs was solely affected by temperature rise due to said dielectric heating and substantially. not by the variety and form of tobacco tested.
  • the dielectric microwave heating employed by the invention'easily attains said object.
  • the irradiated microwaves on tobaccoes or tea they theygenerated in the same direction in a manner to diffuse to such microwave dielectric heating.
  • the offensive and irritative ingredients, contained in tobacco or tea are dispersed, permitting said vegetable products to have a mild taste an aroma, as proved by the examinations conducted by test smoking or drinking specialists/The lower the class of tobacco or tea, the more prominent said effect.
  • the specified testingpanel consisted of seven specialists. They comparatively tested the aforementioned three brands of cigarettes by a profile method for their odor (aroma), taste, mildness and general feeling with untreated cigarettes used as control by allotting seven marks -3 to +3) to each'of these cigarettes.
  • the numerals in Table 3 below are totals for each category given by said seven specialists in comparison with the control.
  • the pulse mark denotes the improved quality of the tested cigarettes over the control.
  • the temperature at which it is treated is generally desired to be 60C max.
  • the prior art failed to kill'bugs inhabiting tobacco at such temperature.
  • the aforesaid method of the present invention can display an insecticidal eflect even at a temperature of less than 60C aroma and taste of tobacco.
  • the bulkiness of tobacco is one of the most important factors utilized in the tobacco industry. This property is used as the base on which the filling capacity of without deteriorating the from a given amount of shreds.
  • the hardness of tobacco shreds used in cigarettes or their rheological property is an important factor in evaluating the quality of cigarettes from the standpoint of controlling the manufacturing process, elevating commercial value and positively appealing to the mentality of smokers.
  • thermosetting resinous components contained in the cell membrane of the tissue of tobacco or membrous substances thereof are irreversibly hardened due to their own rapid heat buildup to increase in mechanical strength, thereby resulting in the larger bulkiness and apparent volume. Accordingly, application of microwaves according to the present invention permits cigarettes to be prepared with sufficient hardness with smaller amounts of raw tobacco than required in the past, contributing to its saving.
  • the cigarettes Peace and Shinsei were conditioned at a temperature of 20C and relative humidity of 60 percent in a conditioning chamber. Those of the cigarettes which varied 10 mg in weight were selected and heated with the amount of, microwave power and maximum treating temperature attained. After being again conditioned at the aforementioned temperature and humidity, said cigarettes were tested for hardness.
  • Determination of hardness was conducted by sub jccting the cigarettes to a fixed strain in the diametrical direction, continuously recording the intensity of repulsive stress indicated by said cigarettes and calculating an average repulsive stress by integrating meter. As a result it was found as shown in Table 4 below that the treated cigarettes displayed increased hardness over the control, regardless of the brand and that the greater the scale of treatment the more prominently increased the hardness.
  • the method of the present invention provides a hard, well-shaped cigarettes of great commercial value and eliminates the unneccessary consumption of raw material.
  • the present invention uses high frequency waves of 900 MHz min. in killing bugs inhabiting vegetable matter, thereby displaying a full insecticidal effect and improving the quality of tobacco or tea without causing local discharges and changing their colors resulting from the increased field intensity or spoiling thequality of said vegetable matter, for extaste.
  • microwave chokes at the connection and contact of said high frequency wave oven means and high frequency wave absorption means prevents the occurrence-of the leakage of microwaves or sparks.
  • the apparatus may be done without microwave choke.
  • said infrared ray oven means, high frequency-wave absorption means and high frequency wave oven means are separately fabricated and thereafter assembled as an insecticidal apparatus for vegetable matter, thus offering the advantage of simplifying the manufacturing process, facilitating maintenance and inspection of equipment and allowing said equipment to have a substantially full correspondence to the amount of vegetable matter to be treated.
  • various processes for treating vegetable matter, i.e. the treatment of infrared rays may be accomplished for afterheating.
  • a method of insecticidally treating tobacco leaf bug inhabitants and their eggs which comprises in combination first irradiating tobacco leaf with infrared rays to preheat the leaf at a firststation, passing the preheated tobacco leaf through a microwave absorption device into a microwave oven, heating the tobacco leaf to a temperature of about 60C. in the microwave oven by irradiating it with electromagnetic waves of at least 900 Mhz, passing the tobacco leaf out of said microwave oven through a second microwave absorption device and recovering treated tobacco leaf in which any bugs inhabiting the leaf or their eggs have been killed.

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  • Life Sciences & Earth Sciences (AREA)
  • Pest Control & Pesticides (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Toxicology (AREA)
  • Molecular Biology (AREA)
  • Electromagnetism (AREA)
  • Physics & Mathematics (AREA)
  • Insects & Arthropods (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Environmental Sciences (AREA)
  • Catching Or Destruction (AREA)
  • Manufacture Of Tobacco Products (AREA)
  • Constitution Of High-Frequency Heating (AREA)
US6144A 1969-01-27 1970-01-27 Method for killing tobacco leaf bug inhabitants and their eggs Expired - Lifetime US3699976A (en)

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Cited By (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3890980A (en) * 1971-06-24 1975-06-24 Erwin Helmut Geldmacher Method for preventing the escape of tobacco crumbs or detritus at the ends of cigarettes in transparent packages
US4039795A (en) * 1974-09-16 1977-08-02 Philip Morris Incorporated Apparatus for transporting materials for treatment of said materials in a microwave unit
WO1984003021A1 (en) * 1983-01-25 1984-08-02 Deryck Brandon Apparatus and method for heating, thawing and/or demoisturizing materials and/or objects
EP0142958A3 (en) * 1983-11-11 1985-10-30 Microwave Ovens Limited Microwave ovens and methods of cooking food
US4590954A (en) * 1984-09-11 1986-05-27 Gooden Eldon D Process for packaging leaf tobacco
US4922933A (en) * 1987-02-13 1990-05-08 R. J. Reynolds Tobacco Company Tobacco separation or delamination method
US4934385A (en) * 1987-07-11 1990-06-19 Korber Ag Method of and apparatus for treating uncured tobacco
US5372149A (en) * 1992-03-25 1994-12-13 Roth; David S. Sterilization process in the manufacturing of snuff
US5803081A (en) * 1996-06-28 1998-09-08 Regent Court Technologies Tobacco and related products
WO1998058555A1 (en) 1997-06-20 1998-12-30 Regent Court Technologies Method of treating tobacco to reduce nitrosamine content, and products produced thereby
EP0967898A4 (en) * 1996-08-05 2000-01-05 Jonnie R Williams PROCESS FOR TREATING TOBACCO TO REDUCE THE NITROSAMINE CONTENT AND PRODUCTS THUS MANUFACTURED
US6202649B1 (en) 1996-12-02 2001-03-20 Regent Court Technologies Method of treating tobacco to reduce nitrosamine content, and products produced thereby
EP1092354A1 (en) * 1999-10-12 2001-04-18 Athanasios Nikolaou Method for the qualitative improvement of the products of the tobacco plant.
WO2001028367A1 (en) 1997-04-21 2001-04-26 Kerry Scott Lane Method and system for assay and removal of harmful toxins during processing of tobacco products
US20010000386A1 (en) * 1999-04-26 2001-04-26 Peele David Mccray Tobacco processing
US6311695B1 (en) 1996-06-28 2001-11-06 Regent Court Technologies Method of treating tobacco to reduce nitrosamine content, and products produced thereby
EP1226764A1 (de) * 2001-01-26 2002-07-31 Kreyenberg, Heinrich, Dipl. Ing. Dr. (EC) Verfahren zur Schädlingsbekämpfung
US6514349B1 (en) 1999-09-14 2003-02-04 Charles R. Meldrum Produce washing system utilizing multiple energy sources
US20030037482A1 (en) * 2000-04-04 2003-02-27 Grigorov Grigor Rangelov Method and system for exterminating pests, weeds and pathogens
US6537600B1 (en) 1999-09-14 2003-03-25 Charles R. Meldrum Multiple-stage energy-efficient produce processing system
USRE38123E1 (en) 1996-06-28 2003-05-27 Regent Court Technologies, Llc. Tobacco products having reduced nitrosamine content
US20040009092A1 (en) * 2001-01-23 2004-01-15 Itel Telecomunicazioni Srl Microwave disinfestation system for biological pests
US20040025892A1 (en) * 2001-01-26 2004-02-12 Heinrich Kreyenberg Process to control pest in stored products
EP1523996A1 (de) * 2003-10-14 2005-04-20 Detlef Schiller Vorrichtung zum Sterilisieren von Gegenständen mittels Mikrowellen
BG65186B1 (bg) * 1997-12-23 2007-06-29 Regent Court Technologies Метод за обработка на тютюн за намаляване на съдържанието на нитрозамини и продукти, получени по този метод
AU2004224908B2 (en) * 1999-10-12 2007-12-06 Athanasios Nikolaou Method for the Qualitative Improvement of the Products of the Tobacco Plant
US20100154810A1 (en) * 2008-12-23 2010-06-24 Williams Jonnie R Tobacco Curing Method
US20100186285A1 (en) * 2007-07-25 2010-07-29 Robert Schmitt Arrangement for destroying vermin
CN101889567A (zh) * 2010-06-30 2010-11-24 云南瑞升烟草技术（集团）有限公司 微波技术在防治烟草病虫害的应用
US20120066959A1 (en) * 2010-09-16 2012-03-22 R.J. Reynolds Tobacco Company Door assembly for a tobacco storage facilty, and associated apparatus and method
US20130212928A1 (en) * 2012-02-17 2013-08-22 Nathaniel L. Cohen Apparatus for using microwave energy for insect and pest control and methods thereof
US20170156304A1 (en) * 2013-11-29 2017-06-08 Masatoshi Hori Pest control method and control device
WO2018096542A1 (en) 2016-11-27 2018-05-31 Yissum Research Development Company Of The Hebrew University Of Jerusalem Ltd. A field pesticide system and a method for eliminating pests
CN108371162A (zh) * 2018-04-23 2018-08-07 冯锦文 一种农用微波杀虫设备的使用方法
CN108377993A (zh) * 2018-04-20 2018-08-10 福建农林大学 一种通过微波杀茶园茶小绿叶蝉的方法
CN113545432A (zh) * 2021-03-16 2021-10-26 佛山倍翔自动化科技有限公司 熟化箱
US20220279840A1 (en) * 2019-12-23 2022-09-08 China Tobacco Hunan Industrial Co., Ltd. Device and method for preparing fully granular cigarette/filter rod, and prepared fully granular cigarette/filter rod
US20250169488A1 (en) * 2023-11-23 2025-05-29 Yangtze Delta Region Institute (Huzhou), University of Electronic Science and Technology of China Control system and control method for pest killing by microwave and computer device and storage medium thereof
US12396451B2 (en) 2023-10-03 2025-08-26 Symterra , Inc. Pest repellant system with compliant architecture

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US5908441A (en) * 1997-01-16 1999-06-01 Bare; James E. Resonant frequency therapy device
ES2585261B2 (es) * 2016-03-14 2018-10-10 Empresa De Transformación Agraria, S.A. (Tragsa) Dispositivo y método de eliminación selectiva de pupas

Cited By (65)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3890980A (en) * 1971-06-24 1975-06-24 Erwin Helmut Geldmacher Method for preventing the escape of tobacco crumbs or detritus at the ends of cigarettes in transparent packages
US4039795A (en) * 1974-09-16 1977-08-02 Philip Morris Incorporated Apparatus for transporting materials for treatment of said materials in a microwave unit
WO1984003021A1 (en) * 1983-01-25 1984-08-02 Deryck Brandon Apparatus and method for heating, thawing and/or demoisturizing materials and/or objects
EP0142958A3 (en) * 1983-11-11 1985-10-30 Microwave Ovens Limited Microwave ovens and methods of cooking food
US4590954A (en) * 1984-09-11 1986-05-27 Gooden Eldon D Process for packaging leaf tobacco
US4922933A (en) * 1987-02-13 1990-05-08 R. J. Reynolds Tobacco Company Tobacco separation or delamination method
US4934385A (en) * 1987-07-11 1990-06-19 Korber Ag Method of and apparatus for treating uncured tobacco
US5372149A (en) * 1992-03-25 1994-12-13 Roth; David S. Sterilization process in the manufacturing of snuff
US5803081A (en) * 1996-06-28 1998-09-08 Regent Court Technologies Tobacco and related products
US6338348B1 (en) 1996-06-28 2002-01-15 Regent Court Technologies Method of treating tobacco to reduce nitrosamine content, and products produced thereby
US6135121A (en) * 1996-06-28 2000-10-24 Regent Court Technologies Tobacco products having reduced nitrosamine content
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