WO1997045687A1 - Dispositif pour conditionner des pastilles - Google Patents

Dispositif pour conditionner des pastilles Download PDF

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Publication number
WO1997045687A1
WO1997045687A1 PCT/CA1997/000364 CA9700364W WO9745687A1 WO 1997045687 A1 WO1997045687 A1 WO 1997045687A1 CA 9700364 W CA9700364 W CA 9700364W WO 9745687 A1 WO9745687 A1 WO 9745687A1
Authority
WO
WIPO (PCT)
Prior art keywords
heat
air
conditioner
pellets
discharge
Prior art date
Application number
PCT/CA1997/000364
Other languages
English (en)
Inventor
James Richard Robert Neilson
Original Assignee
Webb Technologies Ltd.
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 Webb Technologies Ltd. filed Critical Webb Technologies Ltd.
Priority to AU28831/97A priority Critical patent/AU2883197A/en
Publication of WO1997045687A1 publication Critical patent/WO1997045687A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/12—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
    • F26B17/128—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft with provisions for working under reduced or increased pressure, with or without heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B17/00—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement
    • F26B17/12—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft
    • F26B17/16—Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement with movement performed solely by gravity, i.e. the material moving through a substantially vertical drying enclosure, e.g. shaft the materials passing down a heated surface, e.g. fluid-heated closed ducts or other heating elements in contact with the moving stack of material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B23/00—Heating arrangements

Definitions

  • the invention relates to an apparatus for conditioning plastic pellets, that is granular synthetic plastic resins, for use in plastic molding or extrusion machines.
  • the pellets are heated by direct contact with a heated heat transfer surface, by radiation and/or by heat transferred by contact with adjacent warmed pellets.
  • a heated heat transfer surface by radiation and/or by heat transferred by contact with adjacent warmed pellets.
  • one difficulty experienced with the improved device relates to maintaining accurate surface temperature so as to prevent overheating of the heat transfer surfaces which could unintentionally melt the resin and foul the interior of the device.
  • the improved device of the patent discloses use of insulating spacers to reduce chances of overheating due to contact between the heater and structure which could result in some areas having undesirably much higher temperatures than other areas, termed "localized hot spots".
  • the pellets should be rapidly heated to a temperature as close as possible to the thermal deflection temperature of the plastic, commonly called “sticking point", and yet the thermal deflection temperature must not be attained otherwise surface melting will occur and fouling of the device will result.
  • the pellets should be maintained at approximately 5 degrees F (about 2.7 degrees C) below the "sticking point", but because most heaters can only maintain uniform surface temperatures within plus or minus 5 degrees F, to avoid overheating the temperature control must be set at a temperature well below optimum temperatures for extracting moisture, thus increasing processing time.
  • One of the problems associated with accurate temperature control relates to different rates of heating of items having different heat capacities, for example for a given heat input, a particular item made of aluminum will heat up much faster than the same item made of steel.
  • the invention reduces the difficulties and disadvantages of the prior art by providing a conditioner for pellets which heats surfaces to transfer heat to the pellets in such a manner that temperature of the surfaces can be accurately and uniformly controlled to prevent overheating of the pellets.
  • air is drawn through the heated pellets by an air mover located at an exhaust of the apparatus, and an intake of the air is restricted thus subjecting the chamber containing the pellets to sub- atmospheric pressure, so as to enhance drying.
  • the chamber containing the pellets is provided with a plurality of heated fins to provide a relatively large surface area to transfer the heat to the pellets.
  • the fins are subjected to a generally uniform temperature along their length which can be relatively close to the "sticking point" so as to optimize the heating of the pellets.
  • a conditioner according to the invention comprises a main body, a plurality of fins, a heater and an air conduit.
  • the main body has a main wall defining in part a main chamber within the body, the main chamber having a generally vertical, main longitudinal axis.
  • the chamber has an inlet to receive pellets and a discharge to discharge the pellets.
  • the fins extend longitudinally of the main body and each fin has an outer fin portion adjacent the main wall, and an inner fin portion located inwardly of the main wall.
  • the heater is located within the fins to heat the fins generally uniformly.
  • the air conduit has an inlet portion to receive air, a pre-heating portion communicating with the inlet portion, an extraction portion communicating with the pre-heating portion and the main chamber, and an outlet portion communicating with the extraction portion to discharge air from the conduit.
  • the extraction portion of the air conduit has a perforated side wall
  • the pre-heating portion of the air conduit comprises a longitudinally extending passage provided within each fin and exposed to heat from the heater.
  • the heater comprises a primary heat source and an axially extending heat tube.
  • the heat tube is disposed generally vertically and contains a working fluid to accept heat from the primary heat source, and to emit heat selectively along the axis of the tube to maintain a generally uniform temperature.
  • an air mover cooperates with the air conduit to move air from the inlet portion to the outlet portion of the air conduit.
  • the inlet portion of the air conduit has a restriction
  • the air mover is a vacuum fan located adjacent the outlet portion of the air conduit so as to draw air through the conduit and to expose the main chamber to sub-atmospheric pressure so as to enhance drying of the pellets.
  • An alternative condition according to the invention comprises a main body having a main wall defining in part a main chamber within the body, the main chamber having an inlet to receive pellets, and a discharge to discharge pellets.
  • the conditioner also comprises a heater extending into the chamber, the heater comprising a primary heat source and a heat tube, the heat tube containing a working fluid to accept heat from the respective primary heat source and to emit heat selectively along the heat tube to maintain a generally uniform temperature along the tube.
  • FIG 1 is a simplified, partly fragmented longitudinal section of a conditioning apparatus according to the invention using vertically disposed heaters, plane of the section being generally on line 1-1 of Figure 3,
  • Figure 2 is a simplified top plan view of the apparatus
  • Figure 3 is a simplified transverse cross section, generally on line 3-3 of Figure 1,
  • FIG. 4 is a simplified diagrammatic section through an alternative conditioning apparatus according to the invention using horizontally disposed heaters
  • Figure 5 is a simplified transverse cross section on line 5-5 of Figure 4,
  • Figure 6 is a simplified diagram of an alternative eductor vacuum pump
  • Figure 7 is a simplified fragmented section through a portion of an apparatus showing an alternative electrical resistance heater.
  • a conditioning apparatus 10 has a main body 12 having a main cylindrical wall 14 defining in part a main chamber 16 within the body.
  • the main chamber 16 has a generally vertical, main longitudinal axis 18, an inlet 19 to receive pellets at an upper end of the axis, and a discharge 20 to discharge pellets at a lower end of the axis.
  • An insulated sleeve 21 surrounds the wall 14 to reduce heat loss therethrough.
  • the inlet 19 has an upper flange portion 22 secured to a hopper 24, only a portion of which is shown, the hopper receiving pelletized plastic resin as is well known.
  • the apparatus 10 has a base portion 26 which has an upper rim portion 23 cooperating with the wall 14, and a downwardly tapering funnel portion 27 defining the discharge 20.
  • the portion 26 has a mounting flange secured to an inlet of a conventional plastic forming machine 25, the machine having a feed screw for conveying pellets to a heater for later forming by extrusion or injection molding.
  • the apparatus 10 further comprises a plurality of fins 28 extending longitudinally of the main body.
  • the fins 28 have upper portions 29 generally adjacent the inlet 19 of the main chamber, and lower portions 35 adjacent the discharge 20 of the main chamber.
  • six generally similar fins 28 are shown extending radially from the axis 18, and thus only one fin will be described.
  • the fin 28 has an outer fin portion 30 located adjacent the main wall 14, and an inner fin portion 32 located inwardly of the main wall but spaced from the axis 18 for reasons to be described.
  • the outer fin portion 30 of the fin 28 has a generally triangular cross section defined by a curved base portion 45, and straight side portions 47 and 48 extending inwardly therefrom to converge relatively steeply to a vertex portion 31.
  • the fin 28 further includes an intermediate fin portion 33 which tapers relatively slowly inwardly from the vertex portion 31 towards the inner fin portion 32.
  • the portions 45, 47 and 48 are relatively thin walls, whereas the intermediate portion 33 is solid.
  • the base portion 45, side portions 47 and 48 and vertex portion 31 define a conduit 50 which extends longitudinally through the outer fin portion generally adjacent a maximum width thereof and serves as a portion of an air conduit 34 as will be described.
  • the outer fin portion has a cross-sectional area greater than the inner fin portion to provide adequate space for the conduit 50.
  • the air conduit 34 transports air through the apparatus through a convoluted route to pre ⁇ heat the air prior to passing around the pellets to remove moisture driven off from the pellets by heating.
  • the air conduit 34 has six parallel routes, one route passing initially through each fin 28, and these routes unite into a single route adjacent lower portions of the fins. Each of the six routes has an inlet portion 36 to receive air, and each inlet portion has a restriction to restrict flow of air therethrough.
  • the air conduit further includes the conduit 50 of each fin which serves as a pre-heating portion communicating with the respective inlet portion 36.
  • the conduit 34 also has an extraction portion 42 which receives air from the six conduits 50 and communicates with the main chamber and with an air mover housing 38 through a connector portion 40.
  • the housing 38 has a rotatable vacuum fan 39 to draw air through the air conduit prior to discharge through an outlet portion 37.
  • Undesignated arrows show direction of air flowing downwardly through the inlet portions 36, downwardly through the pre-heating portions 50, upwardly through the extraction portion 42, downwardly through the connector portion 40 and into the air mover housing 38 and then upwardly through the outlet portion 37.
  • the extraction portion 42 of the air conduit is a generally cylindrical tube 52 having a perforated side wall extending concentrically about the axis 18 and disposed closely adjacent the inner fin portions 32.
  • the tube 52 and the fins 28 divide the main chamber 16 into six equally shaped minor chambers defined by opposed faces of adjacent fins 28, and opposed faces of portions of the main wall 14 and the cylindrical tube 52 extending between the adjacent fins.
  • Each minor chamber is filled with pellets, many of which contact the sides of the minor chamber.
  • the conditioning apparatus 10 further comprises a heater 55 located within the fins to heat the fins generally uniformly by conduction, and thus the fins are preferably fabricated from material having a high thermal conductivity such as aluminum or copper.
  • the heater 55 comprises a pair of annular electrical resistance heating elements 57 located adjacent the lower portions 35 of the fins, the heater having a control system to maintain relatively accurate temperature control of the elements, i.e. within 3 degrees F.
  • the heating elements extend around and are in intimate thermal contact with a cup-like holder 59 which locates lower ends of the fins to hold them in spaced apart relationship.
  • the holder 59 has complementary recesses to receive the lower ends of the fins, which are insert cast therein so as to be in intimate thermal contact therewith to ensure efficient heat transfer to the fins.
  • the lower portions of the outer fin portions 30 have a tapering portion 61 to provide an outlet for air leaving the pre-heating portion or conduit 50 to pass between the heating element 57 and an opposing wall of the base portion.
  • the holder 59 and the base portion 26 define a narrow annular channel 60 adjacent the funnel portion 27 and the discharge 20 of the chamber to transfer air flow from the pre-heating portion 50 to the extraction portion 52.
  • the heater 55 further comprises a heat tube 63 disposed generally vertically within the vertex portion 31 of each fin.
  • the heat tube is a known heating device for maintaining highly accurate temperatures along a relatively long length and is a sealed tube containing a working fluid selected for a particular condensing temperature.
  • the fluid accepts heat from and is evaporated by a primary heat source, which in this instance is the electrical resistance element 57, and condenses at specific locations along the tube, which locations initially are at a temperature below the condensing temperature.
  • a primary heat source which in this instance is the electrical resistance element 57
  • condenses at specific locations along the tube, which locations initially are at a temperature below the condensing temperature.
  • latent heat of condensation is emitted when the vaporized working fluid condenses at a particular location, thus raising the temperature of that location.
  • Vaporized working fluid will continue to condense at that particular location until the temperature reaches the temperature of the vaporized fluid, and thus the temperature of the location cannot exceed the condensing temperature.
  • the particular working fluid and operating pressure of the heat tube depends upon the specific application, and in the apparatus 10 the working fluid is water as the operating temperature of the heat tube is selected to be between 175 and 500 degrees F (80 and 260 degrees C) .
  • Suitable heat tubes obtained directly from manufacturers usually have relatively thin walls to enhance heat transfer, and such heat tubes can be inserted within complementary bores within the vertex portion 31 of each fin 28 to be in intimate contact with the fin for efficient heat transfer.
  • the fin itself should have a bore to serve as the heat tube itself so as to simplify manufacturing and to further enhance heat transfer into the fin.
  • the heat tube passes longitudinally along each fin and is located inwardly of the pre-heating portion or conduit 50 of the air conduit.
  • the heating element 57 For one example of the apparatus 10, for a typical fin having a length of 24 inches (600 mms) power input to the heating element 57 is approximately 200-250 watts, and temperature along the length of heat pipe can be controlled to be within about 2- 3 degrees F (1 to 1.6 degrees C) of an operating temperatures of 400 degrees F (204 degrees C) . Clearly, temperature of the heating elements 57 must not exceed the sticking point of the plastic so as to avoid contamination of the lower portions of the fins.
  • the working fluid accepts heat from the heating element 57, and then emits heat selectively along the axis of the tube to maintain a generally uniform temperature along the fin.
  • each fin has a heat tube extending longitudinally therethrough, heat from the respective heat tube passes outwardly from the tube along the side portions 47 and 48, as well as along the intermediate fin portion 33 to the inner fin portion 32 adjacent the cylindrical tube 52.
  • the primary heat source namely at least one of the annular electrical resistance heating elements 57, is essentially contiguous with the lower portions 35 of the fins to ensure adequate heat transfer from the heating element into the lower portion of the fins and eventually the heat pipe.
  • the heater 55 is located within the fins to heat the fins generally uniformly and to provide a surface temperature dependent on condensation temperature of the fluid and thus is accurately controlled.
  • the temperature can be selected to be slightly below the sticking point of the plastic resin, so as to optimize venting of moisture from the plastic without risk of approaching the sticking point which could otherwise cause fouling of the apparatus.
  • the funnel portion 27 has a downwardly extending annular lip 66 spaced inwardly from an inner wall of the lower mounting base portion 26 to define an annular extraction opening 68 therebetween adjacent the discharge 20 of the main chamber.
  • An extraction conduit 69 communicates the opening 68 with the air mover housing 38 so as to expose the annular extraction opening 68 to sub-atmospheric pressure within the air conduit 34, i.e. the pressure within the housing 38.
  • the extraction conduit 69 thus draws any vapor generated in the forming machine 25 outwardly from the inlet opening of the forming machine, thus further reducing any tendency of moisture to be trapped within the melted plastic.
  • a batch of plastic pellets is fed into the hopper 24, and the pellets pass through the inlet 19 and fall under gravity down the six minor chambers within the chamber 16 (defined by the six fins 28) to accumulate on the funnel portion 27 adjacent the inlet of the forming machine 25.
  • the main chamber 16 is filled with pellets
  • the hopper 24 is filled to provide additional pellets to replace those that are removed from the discharge 20 of the apparatus.
  • the two heating elements 57 and the motor of the vacuum fan 39 are supplied with power so that the heat pipes rapidly attain operating temperature, and the main chamber is subjected to sub-atmospheric pressure as air is drawn through the restriction adjacent the inlet portion 36 and then discharged through the outlet portion 37. When both the heating elements are operating, the heat pipes attain operating temperature relatively quickly and thus heat the fins 28 rapidly to the same temperature.
  • the fins are heated generally uniformly because any "cold spots" in the fins cause condensation of the fluid at an adjacent location within the heat tube, thus receiving more heat of vaporization from the condensing fluid.
  • air passing down the pre-heating portions or conduit 50 of the fins similarly becomes heated, which heat is further augmented as the air passes around the resistance heating elements 57 and into the extraction portion 42.
  • pellets in contact with or immediately adjacent the fins become heated first and vent off any entrapped moisture.
  • Pellets remote from the fins receive radiant heat from the fin, or heat by conduction from adjacent heated pellets.
  • Air passing upwardly through the mass of pellets contained within the chamber picks up moisture from surfaces of the heated pellets, and the moisture-containing air is extracted either directly from below the bottom of the cylindrical tube 52, or indirectly through the perforations in the side wall of the tube 52 adjacent upper portions of the fins.
  • the inlet 19 of the main chamber is generally adjacent a downstream portion of the extraction portion 42 of the air conduit, i.e. a portion closest to the outlet portion 37 of the air conduit.
  • the invention effectively provides a counter-flow heat exchanger in which atmospheric air leaving the pre ⁇ heating portion 50 is driest and at its highest temperature, and as the air passes upwardly through the extraction portion 42 its humidity is increased to a maximum which is achieved within the tube 52.
  • the heat pipes are always disposed generally vertically with the primary heat source located at a lowermost portion thereof but this is not necessary as will be explained.
  • the primary heat source heats the working fluid which emits heat selectively along the axis of the tube to maintain a generally uniform temperature along the heat tube. Heated moist air is drawn from the top of the extraction porion 42 into the connecting portion 40 and out to atmosphere through the outlet portion 37.
  • any additional water vapor given off by the pellets located adjacent the inlet of the plastic forming machine 25 is similarly removed through the extraction conduit 69 cooperating with the annular extraction opening 68.
  • An alternative conditioning apparatus 75 has a main body 77 having a main wall 79 which can be rectangular in cross- section, or it can be a surface of revolution centred on a main longitudinal axis 80.
  • the axis 80 passes through the centre of a main chamber 81 defined by the wall 79, the main chamber having an inlet 82 to receive pellets, and a discharge 84 to discharge pellets into a plastic molding machine 86, shown fragmented.
  • the conditioning apparatus 75 further includes a plurality of generally horizontally disposed heaters 89 extending generally transversely into the chamber, and the main wall
  • the heaters are arranged in a staggered array, in which upper and lower rows 91 and
  • the heaters are contained within a generally triangular cross-sectioned fin 90 and similarly to the heater 55 of Figure 1, the heaters 89 comprise a primary heat source 96 and the elongated heat tube 97.
  • the heat tube located within the fin 90 contains a working fluid to accept heat from the primary heat source and to emit heat selectively along the axis of the tube and fin and as in the previous embodiment.
  • the heat tubes provide the advantage of maintaining generally uniform temperature along the heat tube, thus enabling the heat tube to operate at a temperature optimally close to the sticking point of the plastic.
  • the vacuum pump has an annular discharge nozzle 102 extending around a pump conduit portion 101 located with an alternative air mover housing 103 which in turn communicates with the air conduit 40 and outlet portion 37.
  • the pump further comprises a pressurized driving fluid duct 105 which extends around the nozzle 102, and receives high pressure fluid, e.g. air, from a supply input 106 communicating with the duct 105.
  • pressurized driving fluid is discharged from the nozzle 102 into the portion 101, the connector portion 40 and associated conduit portions are subjected to sub-atmospheric pressure as before.
  • the ejector vacuum pump functions generally equivalently to the rotary vacuum fan 39, but does not require any moving parts, and can be operated on normal shop air to provide sub-atmospheric pressure within the chamber.
  • Other types of discharge nozzles or fluid driven pumps can be substituted, providing the advantage of eliminating moving parts and corresponding wear and maintenance problems.
  • Fins are preferably heated by heat pipes which simplify temperature control and essentially eliminate any chance of "localized hot spots" on the surface of the fins, thus essentially preventing fouling of the fins or chamber.
  • elongated electrical resistance heating elements 110 can be substituted for the heat pipes, provided very accurate temperature control can be attained along the complete length of the fin so as to prevent localized overheating and fouling of the fins.
  • the alternative electrical heating elements 110 are fitted within longitudinal complementary bores 112 within the fins, as used for the heat tubes. The elements 110 are controlled to provide essentially uniform temperatures along the length of the fins, thus reducing or avoiding "localized hot spots”.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

Un conditionneur (10) permet de conditionner des pastilles de plastique avant de les faire passer dans une machine à former le plastique. Il comprend un corps principal (12) qui définit une chambre principale (16) comportant un orifice d'entrée (19) et un orifice d'évacuation (20), destinés respectivement à recevoir ou à évacuer les pastilles. Une pluralité d'ailettes (28) s'étendent longitudinalement par rapport au corps principal depuis l'orifice d'entrée en direction de l'orifice d'évacuation. Un chauffage (55, 63), disposé à l'intérieur des ailettes (28), chauffe ces dernières de manière généralement uniforme, de façon à éviter les 'points chauds' locaux et donc l'encrassement du conditionneur. Un conduit d'air (34) présente une zone d'entrée (36) destinée à recevoir l'air, une zone de préchauffage (50) communiquant avec la zone d'entrée, une zone d'extraction (42) mettant en communication la zone de préchauffage avec la chambre principale (16), et une zone de sortie (37) communiquant avec la zone d'extraction de façon à faire sortir l'air du conduit. La zone d'extraction (42) comporte une paroi latérale perforée qui permet d'extraire l'air des pastilles placées à l'intérieur de la chambre. La zone de préchauffage (50) comporte un passage allongé longitudinalement à l'intérieur de chaque ailette (28) et exposé à la chaleur provenant du chauffage. De préférence, ce dernier comprend une source de chaleur primaire (57) et un tube à chaleur (63) s'étendant axialement à l'intérieur de chaque ailette. Les tubes à chaleur contiennent un fluide de travail qui accepte la chaleur provenant de la source de chaleur primaire et l'émet sélectivement le long de l'axe du tube.
PCT/CA1997/000364 1996-05-29 1997-05-27 Dispositif pour conditionner des pastilles WO1997045687A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU28831/97A AU2883197A (en) 1996-05-29 1997-05-27 Apparatus for conditioning pellets

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US65463696A 1996-05-29 1996-05-29
US08/654,636 1996-05-29

Publications (1)

Publication Number Publication Date
WO1997045687A1 true WO1997045687A1 (fr) 1997-12-04

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WO (1) WO1997045687A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1012516A1 (fr) * 1998-06-11 2000-06-28 Universal Dynamics, Inc. Procede et dispositif de sechage de solides granuleux par circulation de gaz propulse par venturi
EP0997695A3 (fr) * 1998-10-28 2002-02-06 Kabushikikaisha Matsui Seisakusho Dispositif automatique pour déshumidifier et sécher sous vide du matériau pulvérulent ou granulaire
EP1566604A1 (fr) * 2002-10-21 2005-08-24 Kabushikikaisha Matsui Seisakusho Dispositif de sechage pour materiau pulverulent
ITPD20090055A1 (it) * 2009-03-23 2010-09-24 Christian Schiavolin Dispositivo di deumidificazione per materie plastiche

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US1509280A (en) * 1923-09-13 1924-09-23 Robert E Baker Apparatus for treating grains and organic matter
US1533511A (en) * 1922-11-14 1925-04-14 Louis A Nemetz Grain-drying device
DE1604823A1 (de) * 1966-05-26 1970-07-09 Erich Benninghoven Trockensilo zur staublosen Trocknung und Lagerung von Schuettguetern
US3597850A (en) * 1970-03-11 1971-08-10 Nat Service Ind Inc Continuous vacuum drier
US3875683A (en) 1974-05-17 1975-04-08 Whitlock Inc Integral heater plenum drying hoppers
FR2367260A1 (fr) * 1976-10-05 1978-05-05 Escher Wyss Gmbh Sechoir a fluence
FR2369525A1 (fr) * 1976-11-02 1978-05-26 Lacombe Jacques Sechoir de matiere vegetale, notamment pour cereales
US4304051A (en) * 1980-04-28 1981-12-08 General Electric Company Method and apparatus for drying paper-wound bushings
US4531308A (en) 1983-04-29 1985-07-30 Cactus Machinery Inc. Apparatus for conditioning hygroscopic plastic material
US4773168A (en) 1986-12-24 1988-09-27 Aec, Inc. Thermal dryer for resin processing
WO1989003966A1 (fr) * 1987-10-30 1989-05-05 Custom Equipment Corporation Four a basse temperature
US5033208A (en) 1989-12-13 1991-07-23 Kabushiki Kaisha Matsui Seisakusho Hopper dryer

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1533511A (en) * 1922-11-14 1925-04-14 Louis A Nemetz Grain-drying device
US1509280A (en) * 1923-09-13 1924-09-23 Robert E Baker Apparatus for treating grains and organic matter
DE1604823A1 (de) * 1966-05-26 1970-07-09 Erich Benninghoven Trockensilo zur staublosen Trocknung und Lagerung von Schuettguetern
US3597850A (en) * 1970-03-11 1971-08-10 Nat Service Ind Inc Continuous vacuum drier
US3875683A (en) 1974-05-17 1975-04-08 Whitlock Inc Integral heater plenum drying hoppers
FR2367260A1 (fr) * 1976-10-05 1978-05-05 Escher Wyss Gmbh Sechoir a fluence
FR2369525A1 (fr) * 1976-11-02 1978-05-26 Lacombe Jacques Sechoir de matiere vegetale, notamment pour cereales
US4304051A (en) * 1980-04-28 1981-12-08 General Electric Company Method and apparatus for drying paper-wound bushings
US4531308A (en) 1983-04-29 1985-07-30 Cactus Machinery Inc. Apparatus for conditioning hygroscopic plastic material
US4773168A (en) 1986-12-24 1988-09-27 Aec, Inc. Thermal dryer for resin processing
WO1989003966A1 (fr) * 1987-10-30 1989-05-05 Custom Equipment Corporation Four a basse temperature
US5033208A (en) 1989-12-13 1991-07-23 Kabushiki Kaisha Matsui Seisakusho Hopper dryer

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1012516A1 (fr) * 1998-06-11 2000-06-28 Universal Dynamics, Inc. Procede et dispositif de sechage de solides granuleux par circulation de gaz propulse par venturi
EP1012516A4 (fr) * 1998-06-11 2002-01-30 Universal Dynamics Inc Procede et dispositif de sechage de solides granuleux par circulation de gaz propulse par venturi
USRE39271E1 (en) * 1998-06-11 2006-09-12 Universal Dynamics, Inc. Method and apparatus for drying granular solids with venturi powered gas circulation
EP0997695A3 (fr) * 1998-10-28 2002-02-06 Kabushikikaisha Matsui Seisakusho Dispositif automatique pour déshumidifier et sécher sous vide du matériau pulvérulent ou granulaire
EP1566604A1 (fr) * 2002-10-21 2005-08-24 Kabushikikaisha Matsui Seisakusho Dispositif de sechage pour materiau pulverulent
EP1566604A4 (fr) * 2002-10-21 2012-11-14 Kabushikikaisha Matsui Seisakusho Dispositif de sechage pour materiau pulverulent
ITPD20090055A1 (it) * 2009-03-23 2010-09-24 Christian Schiavolin Dispositivo di deumidificazione per materie plastiche
WO2010109403A1 (fr) * 2009-03-23 2010-09-30 Christian Schiavolin Dispositif de déshumidification pour matériaux en plastique
CN102362136A (zh) * 2009-03-23 2012-02-22 克里斯蒂安·斯齐亚沃林 用于塑料材料的除湿装置
CN102362136B (zh) * 2009-03-23 2014-11-12 克里斯蒂安·斯齐亚沃林 除湿装置、其使用方法及包括该除湿装置的处理装置

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