EP3702709A1 - Drying container and method for drying plastic granulate - Google Patents
Drying container and method for drying plastic granulate Download PDFInfo
- Publication number
- EP3702709A1 EP3702709A1 EP19159624.6A EP19159624A EP3702709A1 EP 3702709 A1 EP3702709 A1 EP 3702709A1 EP 19159624 A EP19159624 A EP 19159624A EP 3702709 A1 EP3702709 A1 EP 3702709A1
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- European Patent Office
- Prior art keywords
- drying
- container
- air
- wall
- air duct
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Classifications
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- 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
- F26B17/14—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 moving through a counter-current of gas
- F26B17/1408—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 moving through a counter-current of gas the gas being supplied and optionally extracted through ducts extending into the moving stack of material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/02—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure
- F26B21/04—Circulating air or gases in closed cycles, e.g. wholly within the drying enclosure partly outside the drying enclosure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B21/00—Arrangements or duct systems, e.g. in combination with pallet boxes, for supplying and controlling air or gases for drying solid materials or objects
- F26B21/06—Controlling, e.g. regulating, parameters of gas supply
- F26B21/08—Humidity
- F26B21/083—Humidity by using sorbent or hygroscopic materials, e.g. chemical substances, molecular sieves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B25/00—Details of general application not covered by group F26B21/00 or F26B23/00
- F26B25/06—Chambers, containers, or receptacles
- F26B25/08—Parts thereof
- F26B25/12—Walls or sides; Doors
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B2200/00—Drying processes and machines for solid materials characterised by the specific requirements of the drying good
- F26B2200/08—Granular materials
Definitions
- the invention relates to a drying container for drying plastic granules according to the preamble of claim 1.
- the invention also relates to a method for drying plastic granules according to the preamble of claim 9.
- plastic granulate Before processing plastic granulate, it is essential to dry it. This applies in particular to hygroscopic plastics such as PA or PBT, which store water molecules like a sponge. Dampness in the plastic granulate used causes inferior molded parts that do not meet the requirements. Typical defects range from so-called moisture streaks to a breakdown of the molecular chain with a corresponding loss of strength.
- Different drying processes are used to dry plastic granulates.
- the dry air is generated in an air drying cartridge in the dryer.
- the air to be dehumidified flows past a so-called molecular sieve, which absorbs the water contained in the air.
- the molecular sieve consists of a porous granulate (for example a silicate gel), which has a high absorption capacity for water.
- a drying container is arranged which contains the plastic granulate to be dried and which has an upper cylindrical part, to which a lower funnel-shaped part is connected.
- the drying air is fed to the plastic granulate via a diffuser cone arranged in the middle of the drying container.
- This so-called adsorption process proves to be very energy-intensive, since the molecular sieve must be reactivated in each case by heating to 250 ° C to 350 ° C.
- compressed air dryers are also used to dry plastic granulate.
- a valve for pressure and flow rate reduction is connected to a regularly available compressed air connection, to which a process heater is connected, which heats air to drying temperature before it flows through the material container.
- the following effect is used here: With increasing pressure, the air's ability to absorb water decreases. When the air is compressed, a large part of the water is separated out. If this compressed air is relaxed to the ambient pressure, the relaxed air has a dew point of approx. -25 ° C. The dew point is the temperature at which the moisture bound in the air condenses on an object. The lower the dew point of the air, the higher its water absorption capacity.
- the object of the invention is to increase the efficiency of such drying devices. According to the invention, this object is achieved by a drying container with the features of claim 1.
- the invention provides a drying container for drying plastic granulate, the efficiency of which is increased. Surprisingly, it has been shown that the discharge amount of the water in the plastic granulate is significantly increased by the drying air introduced into the drying container, if the drying air is not, as is known in the prior art, centrally via a diffuser cone, but rather from the outside to the inside through at least an air duct is introduced which is arranged at least partially radially around the longitudinal center axis of the drying container and which is provided with outlet openings and which can be connected to a connection for connection to a drying gas source.
- the air duct has a projection which is directed radially to the central axis of the drying container and in which the outlet openings are arranged.
- the air duct is arranged in the manner of a ring line on the inner wall of the drying container, whereby a uniform radial introduction of air is achieved.
- the drying container has a straight, in particular hollow-cylindrical container wall, which merges into a funnel-shaped section which opens into a removal opening, the air duct being delimited by a preferably hollow-cylindrical inner wall which runs parallel to the straight container wall and which is preferably hollow the funnel-shaped section is placed.
- a circumferential air duct is achieved, which in particular can also be retrofitted in conventional drying containers from the prior art.
- the container wall does not have to have a circular cross-section. For example, this can also be designed as a hollow cuboid.
- the inner wall is advantageously connected to the straight container wall via a funnel-shaped, preferably a hollow-cone section-shaped cover surface.
- an offset ring which extends radially inward and in which the outlet openings are arranged, is arranged in the transition between the inner wall and the cover surface, which is preferably in the form of a hollow cone section.
- the invention also relates to a device for drying plastic granulate with a drying container of the above type, the at least one air duct of which is connected to a drying gas source.
- the drying gas source can in particular be a compressed air source, which is preferably connected to the air duct via an expansion valve connected is.
- the drying gas source can also be formed by the drying air outlet of an adsorption dryer.
- the preparation of the drying air to achieve the highest possible water absorption capacity is of subordinate importance for the device according to the invention.
- Essential to the invention is the introduction of drying air into the plastic granulate from the inside wall of the drying container via an at least regionally ring-shaped air duct.
- the term "ring-shaped" is not limited to a circular shape in this context; Rather, any shape is to be subsumed under this that extends circumferentially along the inner wall of the drying container, which likewise does not have to have a circular cross-section.
- the present invention also relates to a method for drying plastic granules which enables water to be efficiently discharged from the base material granules.
- the fact that the drying air is added to the plastic granulate radially through an air channel guided along the wall of the drying container means that the water discharge from the basic material granulate is maximized.
- the drying air is preferably blown into the drying container essentially in the direction of gravity. Expanded compressed air is particularly preferably used as the drying air.
- the device selected as an exemplary embodiment for drying plastic granulate essentially consists of a drying container 1, which is connected with a drying gas source 5 is connected.
- the drying container 1 comprises a straight, in particular cylindrical section 11, to which a funnel-shaped, in particular frustoconical section 12 adjoins.
- a first air guide channel 2 is arranged in the cylindrical section 11, which is essentially delimited by a cylindrical inner wall 21 which is arranged parallel to the container wall 10 and has an air outlet 22 which is delimited by an air guide plate 23.
- the first air duct 2 is further limited by two cover plates 24 arranged parallel to one another.
- a second air duct 3 is arranged in the frustoconical section 12 of the drying container 2.
- the air duct 3 is essentially formed by a funnel-shaped inner wall 31 arranged parallel to the drying container wall and has air outlets 32 which are delimited by an air baffle 33.
- the second air duct 3 is delimited on one side by a cover plate 34 and on its side facing the air outlets 32 by an annular piece 35.
- the first air duct 2 is connected to a drying source 5, which is formed from a fan 51 and a heater 52 connected downstream thereof.
- the second air duct 3 is connected to a drying source 5, which comprises a compressed air source 53, which in turn is followed by a heater 52.
- the two air ducts 2, 3 can also be connected to a common drying gas source or to similar drying air sources (hot air source / compressed air source).
- the first air duct 2 is connected to the drying air outlet of an adsorption dryer.
- the adsorption dryer 6 essentially comprises a drying cartridge 61 which contains a molecular sieve and which is connected via a first line 62 to a blower 63 and to a heater 64 connected downstream of this.
- the drying air introduced into the drying container 1 is circulated via the first line 62 through the drying cartridge 61.
- a second line 65 is through the desiccant cartridge 61 out through which the regeneration of the desiccant cartridge 61 is carried out by a fan 63 with a downstream heater 64 heated air.
- FIG 3 a lower section of a further embodiment of a drying container 1 is shown in a detailed representation.
- the drying container 1 has an air duct 4 which is arranged in the transition between the cylindrical section 1 and the frustoconical section 12.
- a tubular cylinder sheet 41 is introduced into the drying container 1 and rests on the inner wall 10 of the frustoconical section 12 and is connected to it in an airtight manner.
- the outer diameter of the cylinder sheet 41 is smaller than the inner diameter of the container wall 10 of the cylindrical section 11.
- the cylinder sheet 41 is adjoined by a frustoconical funnel sheet 42, which is connected to the cylinder sheet 41 via an offset ring 43.
- the offset ring is provided with outlet openings 44 all around the radial direction.
- the enlarged diameter end of the funnel plate 42 opposite the offset ring 43 rests against the inner wall of the cylindrical section 11 of the drying container 1 and is connected to it in an airtight manner.
- the air duct 4 is delimited on the one hand by the container wall 10 and on the other hand by an inner wall formed by the cylinder plate 41 and the funnel plate 42.
- a connection 45 is attached to the drying container 1, which penetrates the inner wall 10 in the area of the air guide channel 4.
- a drying container 1 of this type filled with plastic granulate, is subjected to drying air, for example with relaxed and heated compressed air, via connection 45, then the ring-shaped air duct 4 is flooded with drying air.
- the drying air then flows through the outlet openings 44 of the offset ring 43 essentially in the gravitational direction, that is, vertically downwards into the plastic granulate, where it spreads radially inwardly through the plastic granulate. Due to the buoyancy effect, the heated drying air then rises through the plastic granulate.
- the drying air flowing around the plastic withdraws an amount of water that - as has surprisingly been shown - is significantly greater than in drying containers of the prior art with a central, central drying air supply.
- the drying container 1 and also the cylinder plate 41, the funnel plate 43 and the offset ring 42 are made of stainless steel in the exemplary embodiment.
- all components can also be made from other, in particular from non-metallic materials.
- sheet metal refers exclusively to the “thin walls” of the components, the thickness of which is considerably less than their areal dimension.
- the air duct can be arranged at any position of the drying container. It is preferable to choose a position far below in order to maximize the flow path of the drying air as possible. Furthermore, as in Figures 1 and 2 shown, several, in particular parallel to each other arranged air ducts can be arranged, which can be fed via a common drying air source or also in each case via a separate drying air source. By arranging a plurality of air ducts fed separately with drying air, a different flow rate and / or drying air quantity can be set, whereby the flow through the plastic granulate with drying air can be set in more detail.
- drying air is used throughout as drying gas in the above exemplary embodiments, the invention is not restricted to the use of drying air.
- the invention naturally encompasses the use of all drying gases suitable for drying plastic granulate.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Drying Of Solid Materials (AREA)
Abstract
Die Erfindung betrifft einen Trocknungsbehälter (1) zur Trocknung von Kunststoffgranulat, wobei in dem Trocknungsbehälter (1) an seiner Innenwand (10) wenigstens ein zumindest bereichsweise radial umlaufender, mit Auslassöffnungen (44) versehener Luftleitkanal (2, 3, 4) angeordnet ist, der einen Anschluss zur Verbindung mit einer Trocknungsgasquelle aufweist. Die Erfindung betrifft weiterhin eine Vorrichtung zur Trocknung von Kunststoffgranulat mit einen solchen Trocknungsbehälter sowie ein Verfahren zur Trocknung von Kunststoffgranulat mit einer solchen Vorrichtung.The invention relates to a drying container (1) for drying plastic granulate, with at least one air duct (2, 3, 4) provided with outlet openings (44) and provided with outlet openings (44) being arranged on its inner wall (10) in the drying container (1), which has a connection for connection to a drying gas source. The invention further relates to a device for drying plastic granules with such a drying container and a method for drying plastic granules with such a device.
Description
Die Erfindung betrifft einen Trocknungsbehälter zur Trocknung von Kunststoffgranulat nach dem Oberbegriff des Patentanspruchs 1. Die Erfindung betrifft weiterhin ein Verfahren zur Trocknung von Kunststoffgranulat nach dem Oberbegriff des Patentanspruchs 9.The invention relates to a drying container for drying plastic granules according to the preamble of
Vor der Verarbeitung von Kunststoffgranulat ist es zwingend erforderlich, dieses zu trocknen. Dieses betrifft insbesondere hygroskopische Kunststoffe, wie beispielsweise PA oder PBT, welche Wassermoleküle vergleichbar einem Schwamm speichern. Durch Feuchtigkeit des eingesetzten Kunststoffgranulates werden minderwertige Formteile verursacht, welche den gestellten Anforderungen nicht entsprechen. Typische Fehlerbilder reichen von den so genannten Feuchtigkeitsschlieren bis hin zu einem Molekularkettenabbau mit entsprechendem Festigkeitsverlust.Before processing plastic granulate, it is essential to dry it. This applies in particular to hygroscopic plastics such as PA or PBT, which store water molecules like a sponge. Dampness in the plastic granulate used causes inferior molded parts that do not meet the requirements. Typical defects range from so-called moisture streaks to a breakdown of the molecular chain with a corresponding loss of strength.
Zum Trocknen von Kunststoffgranulaten kommen unterschiedliche Trocknungsverfahren zum Einsatz. Bei Trockenlufttrocknern erfolgt die Trockenlufterzeugung in einer Luft-Trockenpatrone im Trockner. Die zu entfeuchtende Luft wird in der Trockenpatrone an einem so genannten Molekularsieb vorbeigeströmt, welches das in der Luft enthaltene Wasser aufnimmt. Das Molekularsieb besteht aus einem porösen Granulat (beispielsweise einem Silikatgel), welches eine hohe Aufnahmefähigkeit von Wasser besitzt. Ein solcher Adsorptionstrockner ist beispielsweise in der
Aufgrund des einfachen Aufbaus werden zur Trocknung von Kunststoffgranulat unter anderem auch Drucklufttrockner eingesetzt. Dabei wird an einen regelmäßig vorhandenen Druckluftanschluss ein Ventil zur Druck- und Durchflussmengenreduzierung angeschlossen, an das sich eine Prozessheizung anschließt, welche Luft auf Trocknungstemperatur erwärmt, bevor sie den Materialbehälter durchströmt. Dabei macht man sich folgenden Effekt zu Nutze: Mit steigendem Druck nimmt die Aufnahmefähigkeit der Luft für Wasser ab. Bei der Verdichtung von Luft wird bereits ein Großteil des Wassers abgeschieden. Wird diese verdichtete Luft auf dem Umgebungsdruck entspannt, hat die entspannte Luft einen Taupunkt von ca. -25°C. Dabei ist der Taupunkt die Temperatur, bei der die in der Luft gebundene Feuchtigkeit an einem Objekt kondensiert. Je niedriger der Taupunkt der Luft, desto höher ist ihre Wasseraufnahmekapazität.Due to the simple structure, compressed air dryers are also used to dry plastic granulate. A valve for pressure and flow rate reduction is connected to a regularly available compressed air connection, to which a process heater is connected, which heats air to drying temperature before it flows through the material container. The following effect is used here: With increasing pressure, the air's ability to absorb water decreases. When the air is compressed, a large part of the water is separated out. If this compressed air is relaxed to the ambient pressure, the relaxed air has a dew point of approx. -25 ° C. The dew point is the temperature at which the moisture bound in the air condenses on an object. The lower the dew point of the air, the higher its water absorption capacity.
Der Einsatz der vorstehenden Vorrichtungen zur Trocknung von Kunststoffgranulat hat sich in der Praxis bewährt. Vor dem Hintergrund des erheblichen Energiebedarfs der vorbekannten Trocknungsvorrichtungen liegt der Erfindung die Aufgabe zugrunde, die Effizienz solcher Trocknungsvorrichtungen zu erhöhen. Gemäß der Erfindung wird diese Aufgabe durch einen Trocknungsbehälter mit den Merkmalen des Patentanspruchs 1 gelöst.The use of the above devices for drying plastic granulate has proven itself in practice. Against the background of the considerable energy requirement of the previously known drying devices, the object of the invention is to increase the efficiency of such drying devices. According to the invention, this object is achieved by a drying container with the features of
Mit der Erfindung ist ein Trocknungsbehälter zur Trocknung von Kunststoffgranulat bereitgestellt, dessen Effizienz erhöht ist. Überraschend hat sich gezeigt, dass die Austragsmenge des in dem Kunststoffgranulat befindlichen Wassers durch die in den Trocknungsbehälter eingebrachte Trocknungsluft signifikant erhöht wird, wenn die Trocknungsluft nicht, wie im Stand der Technik bekannt, zentral über einen Diffusorkegel, sondern vielmehr von außen nach innen durch wenigstens einen zumindest bereichsweise radial um die Längsmittelachse des Trocknungsbehälters umlaufend angeordneten Luftleitkanal eingebracht wird, der mit Auslassöffnungen versehen ist und der einen Anschluss zur Verbindung mit einer Trocknungsgasquelle verbindbar ist.The invention provides a drying container for drying plastic granulate, the efficiency of which is increased. Surprisingly, it has been shown that the discharge amount of the water in the plastic granulate is significantly increased by the drying air introduced into the drying container, if the drying air is not, as is known in the prior art, centrally via a diffuser cone, but rather from the outside to the inside through at least an air duct is introduced which is arranged at least partially radially around the longitudinal center axis of the drying container and which is provided with outlet openings and which can be connected to a connection for connection to a drying gas source.
In Weiterbildung der Erfindung weist der Luftleitkanal einen radial zur Mittelachse des Trocknungsbehälters gerichteten Vorsprung auf, in dem die Auslassöffnungen angeordnet sind. Hierdurch ist der Luftleitkanal in Art einer Ringleitung an die Innenwand des Trocknungsbehälters angeordnet, wodurch ein gleichmäßiger radialer Lufteintrag erzielt ist.In a further development of the invention, the air duct has a projection which is directed radially to the central axis of the drying container and in which the outlet openings are arranged. As a result, the air duct is arranged in the manner of a ring line on the inner wall of the drying container, whereby a uniform radial introduction of air is achieved.
In Ausgestaltung der Erfindung weist der Trocknungsbehälter eine gerade, insbesondere hohlzylindrische Behälterwand auf, die in einen trichterförmigen Abschnitt übergeht, der in einer Entnahmeöffnung mündet, wobei der Luftleitkanal durch eine parallel beabstandet zur geraden Behälterwand verlaufende, bevorzugt hohlzylinderförmige Innenwand begrenzt ist, die besonders bevorzugt auf den trichterförmigen Abschnitt aufgesetzt ist. Hierdurch ist ein umlaufender Luftleitkanal erzielt, der insbesondere auch in gängigen Trocknungsbehältern aus dem Stand der Technik nachrüstbar ist. Die Behälterwand muss keinen Kreisquerschnitt aufweisen. Beispielsweise kann diese auch hohlquaderförmig ausgebildet sein. Vorteilhaft ist die Innenwand über eine trichterförmige, bevorzugt eine hohlkegelabschnittsförmige Deckfläche mit der geraden Behälterwand verbunden.In an embodiment of the invention, the drying container has a straight, in particular hollow-cylindrical container wall, which merges into a funnel-shaped section which opens into a removal opening, the air duct being delimited by a preferably hollow-cylindrical inner wall which runs parallel to the straight container wall and which is preferably hollow the funnel-shaped section is placed. In this way, a circumferential air duct is achieved, which in particular can also be retrofitted in conventional drying containers from the prior art. The container wall does not have to have a circular cross-section. For example, this can also be designed as a hollow cuboid. The inner wall is advantageously connected to the straight container wall via a funnel-shaped, preferably a hollow-cone section-shaped cover surface.
In weiterer Ausgestaltung der Erfindung ist im Übergang zwischen der Innenwand und der bevorzugt hohlkegelabschnittsförmigen Deckfläche ein radial nach innen sich erstreckender Versatzring angeordnet, in dem die Auslassöffnungen angeordnet sind. Hierdurch ist ein vertikaler Trockenlufteintrag erzielt, wodurch der mit der Trockenluft durchströmte Weg durch das Kunststoffmaterial erhöht ist. Zugleich ist einer möglichen Verstopfung der Auslassöffnungen durch Kunststoffgranulat entgegengewirkt.In a further embodiment of the invention, an offset ring, which extends radially inward and in which the outlet openings are arranged, is arranged in the transition between the inner wall and the cover surface, which is preferably in the form of a hollow cone section. This results in a vertical introduction of dry air, which increases the path through the plastic material through which the dry air flows. At the same time, a possible blockage of the outlet openings by plastic granulate is counteracted.
Gegenstand der Erfindung ist weiterhin eine Vorrichtung zur Trocknung von Kunststoffgranulat mit einem Trocknungsbehälter der vorstehenden Art, dessen wenigstens ein Luftleitkanal mit einer Trocknungsgasquelle verbunden ist.The invention also relates to a device for drying plastic granulate with a drying container of the above type, the at least one air duct of which is connected to a drying gas source.
Bei der Trocknungsgasquelle kann es sich dabei insbesondere um eine Pressluftquelle handeln, die bevorzugt über ein Expansionsventil mit dem Luftkanal verbunden ist. Die Trocknungsgasquelle kann auch durch den Trocknungsluftauslass eines Adsorptionstrockners gebildet sein. Die Aufbereitung der Trocknungsluft zur Erzielung einer möglichst hohen Wasseraufnahmekapazität ist für die erfindungsgemäße Vorrichtung von untergeordneter Bedeutung. Erfindungswesentlich ist der Trocknungslufteintrag über einen zumindest bereichsweise ringförmigen Luftleitkanal in das Kunststoffgranulat von der Trocknungsbehälterinnenwand her. Der Begriff "ringförmig" ist in diesem Zusammenhang nicht auf eine Kreisform begrenzt; vielmehr ist jede Form hierunter zu subsummieren, die sich umlaufend entlang der Innenwand des Trocknungsbehälters, der ebenfalls keinen Kreisquerschnitt aufweisen muss, erstreckt.The drying gas source can in particular be a compressed air source, which is preferably connected to the air duct via an expansion valve connected is. The drying gas source can also be formed by the drying air outlet of an adsorption dryer. The preparation of the drying air to achieve the highest possible water absorption capacity is of subordinate importance for the device according to the invention. Essential to the invention is the introduction of drying air into the plastic granulate from the inside wall of the drying container via an at least regionally ring-shaped air duct. The term "ring-shaped" is not limited to a circular shape in this context; Rather, any shape is to be subsumed under this that extends circumferentially along the inner wall of the drying container, which likewise does not have to have a circular cross-section.
Gegenstand der vorliegenden Erfindung ist darüber hinaus ein Verfahren zur Trocknung von Kunststoffgranulat, das einen effizienten Austrag von Wasser aus dem Grundstoffgranulat ermöglicht. Dadurch, dass die Trocknungsluft dem Kunststoffgranulat radial durch eine entlang der Wand des Trocknungsbehälters geführten Luftkanal zugegeben wird, ist der Wasseraustrag aus dem Grundstoffgranulat maximiert. Bevorzugt wird die Trocknungsluft im Wesentlichen in Gravitationsrichtung in den Trocknungsbehälter eingeblasen. Besonders bevorzugt wird als Trocknungsluft expandierte Pressluft verwendet.The present invention also relates to a method for drying plastic granules which enables water to be efficiently discharged from the base material granules. The fact that the drying air is added to the plastic granulate radially through an air channel guided along the wall of the drying container means that the water discharge from the basic material granulate is maximized. The drying air is preferably blown into the drying container essentially in the direction of gravity. Expanded compressed air is particularly preferably used as the drying air.
Andere Weiterbildungen und Ausgestaltungen der Erfindung sind in den übrigen Unteransprüchen angegeben. Ein Ausführungsbeispiel der Erfindung ist in den Figuren dargestellt und wird nachfolgend im Einzelnen beschrieben. Es zeigen:
Figur 1- die schematische Darstellung einer Vorrichtung zur Trocknung von Kunststoffgranulat;
Figur 2- die schematische Darstellung einer Vorrichtung zur Trocknung von Kunststoffgranulat in einer weiteren Ausführungsform und
Figur 3- die schematische Detaildarstellung des Luftleitkanals eines Trocknungsbehälters einer weiteren Ausführungsform.
- Figure 1
- the schematic representation of a device for drying plastic granulate;
- Figure 2
- the schematic representation of a device for drying plastic granulate in a further embodiment and
- Figure 3
- the schematic detailed representation of the air duct of a drying container of a further embodiment.
Die als Ausführungsbeispiel gewählte Vorrichtung zur Trocknung von Kunststoffgranulat besteht im Wesentlichen aus einem Trocknungsbehälter 1, der mit einer Trocknungsgasquelle 5 verbunden ist. Der Trocknungsbehälter 1 umfasst einen geraden, insbesondere zylindrischen Abschnitt 11, an den sich ein trichterförmiger, insbesondere kegelstumpfförmiger Abschnitt 12 anschließt. In dem zylindrischen Abschnitt 11 ist ein erster Luftleitkanal 2 angeordnet, der im Wesentlichen durch eine parallel zur Behälterwand 10 angeordnete zylindrische Innenwand 21 begrenzt ist, die einen Luftauslass 22 aufweist, der durch ein Luftleitblech 23 begrenzt ist. Der erste Luftleitkanal 2 ist weiterhin durch zwei parallel zueinander angeordnete Abdeckbleche 24 begrenzt.The device selected as an exemplary embodiment for drying plastic granulate essentially consists of a
In dem kegelstumpfförmigen Abschnitt 12 des Trocknungsbehälters 2 ist ein zweiter Luftleitkanal 3 angeordnet. Der Luftleitkanal 3 ist im Wesentlichen durch eine parallel zur Trocknungsbehälterwand angeordnete trichterförmige Innenwand 31 gebildet und weist Luftauslässe 32 auf, die durch ein Luftleitblech 33 begrenzt sind. Der zweite Luftkanal 3 ist auf einer Seite durch ein Abdeckblech 34 und auf seiner den Luftauslässen 32 zugewandten Seite durch ein Ringstück 35 begrenzt.A
Der erste Luftleitkanal 2 ist im Ausführungsbeispiel mit einer Trocknungsquelle 5 verbunden, die aus einem Gebläse 51 sowie einer dieser nachgeschalteten Heizung 52 gebildet ist. Der zweite Luftkanal 3 ist mit einer Trocknungsquelle 5 verbunden, die eine Druckluftquelle 53 umfasst, der wiederum eine Heizung 52 nachgeschaltet ist. Alternativ können beide Luftleitkanäle 2, 3 auch mit einer gemeinsamen Trocknungsgasquelle bzw. mit gleichartigen Trocknungsluftquellen (Heißluftquelle/Druckluftquelle) verbunden sein.In the exemplary embodiment, the
Im Ausführungsbeispiel gemäß
In
Wird ein derartig ausgebildeter, mit Kunststoffgranulat befüllter Trocknungsbehälter 1 über den Anschluss 45 mit Trocknungsluft, beispielweise mit entspannter und erwärmter Pressluft beaufschlagt, so wird der ringförmig ausgebildete Luftleitkanal 4 mit Trocknungsluft geflutet. Die Trocknungsluft strömt sodann über die Auslassöffnungen 44 des Versatzrings 43 im Wesentlichen in Gravitationsrichtung, also vertikal nach unten in das Kunststoffgranulat, wobei sie sich radial nach innen das Kunststoffgranulat durchströmend ausbreitet. Durch den Auftriebseffekt steigt die erhitzte Trocknungsluft sodann durch das Kunststoffgranulat nach oben. Über den nach Verlassen der Auslassöffnungen 44 des Versatzrings 43 durch das Kunststoffgranulat zurückgelegten Strömungsweg wird dem Kunststoffgranulat von der dieses umströmenden Trocknungsluft eine Wassermenge entzogen, die - wie sich überraschend gezeigt hat - signifikant größer ist, als bei Trocknungsbehältern des Standes der Technik mit zentraler, mittiger Trockenluftzufuhr.If a drying
Der Trocknungsbehälter 1 sowie auch das Zylinderblech 41, das Trichterblech 43 sowie der Versatzring 42 sind im Ausführungsbeispiel aus Edelstahl hergestellt. Selbstverständlich können sämtliche Bauteile auch aus anderen, insbesondere auch aus nichtmetallischen Werkstoffen hergestellt sein. Die Bezeichnung "Blech" bezieht sich vorliegend ausschließlich auf die "Dünnwandigkeit" der Bauteile, deren Dicke erheblich geringer ist, als ihr Flächenmaß.The drying
Der Luftleitkanal kann an jeder Position des Trocknungsbehälters angeordnet sein. Bevorzugt ist eine Position weit unten zu wählen, um den Durchströmungsweg der Trocknungsluft möglichst zu maximieren. Weiterhin können, wie in
Wenngleich in den vorstehenden Ausführungsbeispielen durchgehend Trocknungsluft als Trocknungsgas Verwendung findet, ist die Erfindung nicht auf den Einsatz von Trocknungsluft beschränkt. Selbstverständlich ist der Einsatz sämtlicher zur Trocknung von Kunststoffgranulat geeigneter Trocknungsgase von der Erfindung umfasst.Although drying air is used throughout as drying gas in the above exemplary embodiments, the invention is not restricted to the use of drying air. The invention naturally encompasses the use of all drying gases suitable for drying plastic granulate.
Claims (11)
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EP19159624.6A EP3702709A1 (en) | 2019-02-27 | 2019-02-27 | Drying container and method for drying plastic granulate |
EP20157021.5A EP3702710B1 (en) | 2019-02-27 | 2020-02-12 | Drying container and method for drying plastic granulate |
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EP19159624.6A EP3702709A1 (en) | 2019-02-27 | 2019-02-27 | Drying container and method for drying plastic granulate |
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EP20157021.5A Active EP3702710B1 (en) | 2019-02-27 | 2020-02-12 | Drying container and method for drying plastic granulate |
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- 2019-02-27 EP EP19159624.6A patent/EP3702709A1/en not_active Withdrawn
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