EP1650515A1 - Vakuumtrockner für körniges Kunststoffmaterial - Google Patents

Vakuumtrockner für körniges Kunststoffmaterial Download PDF

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Publication number
EP1650515A1
EP1650515A1 EP04425792A EP04425792A EP1650515A1 EP 1650515 A1 EP1650515 A1 EP 1650515A1 EP 04425792 A EP04425792 A EP 04425792A EP 04425792 A EP04425792 A EP 04425792A EP 1650515 A1 EP1650515 A1 EP 1650515A1
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EP
European Patent Office
Prior art keywords
container
valves
granules
air
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04425792A
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English (en)
French (fr)
Inventor
Ferdinando Baldan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sb Plastic Machinery Srl
Original Assignee
Sb Plastic Machinery Srl
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 Sb Plastic Machinery Srl filed Critical Sb Plastic Machinery Srl
Priority to EP04425792A priority Critical patent/EP1650515A1/de
Publication of EP1650515A1 publication Critical patent/EP1650515A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/04—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum
    • F26B5/042—Drying solid materials or objects by processes not involving the application of heat by evaporation or sublimation of moisture under reduced pressure, e.g. in a vacuum for drying articles or discrete batches of material in a continuous or semi-continuous operation, e.g. with locks or other air tight arrangements for charging/discharging
    • 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
    • F26B25/001—Handling, e.g. loading or unloading arrangements
    • F26B25/002—Handling, e.g. loading or unloading arrangements for bulk goods

Definitions

  • This patent relates to the field of vacuum drying devices, and in particular it concerns the drying systems and devices for granular plastic material for its following fusion and moulding.
  • the plastic material used for the moulding of products are distributed and utilized as granules, known as pellets.
  • Said granules are transformed in final or semi-final objects by mean of heating, pouring and moulding or extruding operations.
  • the granules of plastic material are heated at high temperatures, about 150-200°C.
  • plastic materials in granules or pellets, used for moulding or extrusion, are hygroscopic and so they can easily adsorb moisture.
  • Said moisture adsorbed by the granules of plastic material is highly harmful during the process of thermo-moulding or thermo-extrusion, because it causes the formation of bubbles and cavities in the liquefied plastic material.
  • the structure rotates around its central vertical axis and positions said three cylindrical containers in three different stations.
  • each station there is a specific device suitable for performing a predetermined operation.
  • the granules of plastic material are loaded inside the container and, when the loading is complete, the heating/ventilation step begins in order to heat the granules and the air that is blown through them in order to dry them.
  • a suction pump eliminates the air inside the container, thus exhausting vacuum, in order to extract a further amount of moisture that could still be present in the granules.
  • the third station that is the station at which the containers arrive after completing a turn of the rotating structure, also comprises the unloading of the granules dried before the following load of granules that need to be dried.
  • the unloaded granules are sent to the thermo-moulding or thermo-extrusion.
  • the dryer/dehumidifiers thus constituted have many drawbacks.
  • each container When passing from a station to another each container must be opened and then be closed again in the following station. This causes the possibility of wet air infiltration, the possibility of incorrect or incomplete closing of the container, the necessity of a series of mechanisms and covers that must have perfect air seal and that require high maintenance.
  • the rotating structure must move a big amount of granules from a station to the other, in order to satisfy the material requirement of the thermo-moulders or the thermo-extruders. It follows that the rotating structure must have a suitable stoutness and that the moving and rotating parts of said rotating structure must have a suitable power.
  • Aim of the new vacuum dryer is to eliminate all the moisture present in the granules of plastic material and in the air among said granules.
  • the new vacuum dryer is to obtain pre-heating and pre-humidifying of the granules in plastic material before they enter the vacuum dryer without using additional ventilators or heaters.
  • the new vacuum dryer is to keep the granules of plastic material in a dry atmosphere during all the drying-dehumidifying operation, until they arrive at the thermo-extruder or the thermo-moulder.
  • the new vacuum dryer particularly for granules of plastic materials comprising at least three vertical cylindrical containers connected one to the other and to a ventilating/heating system by means of a group of valves.
  • Each container is made of a removable cylinder, with a sealing surface on the circular edges of the two ends and with two covers for said two ends fit for perfectly adhering to the cylinder by means of the sealing gaskets
  • the first container provided on the upper cover with a hopper, receives the granules that have to be dried.
  • the drying is performed by means of a hot air jet from the bottom cover, in a way that part of the air that goes out through the upper cover pre-heats and pre-humidify the granules of the following cycle.
  • the air is extracted by means of a vacuum pump. In this way the moisture that might still be present in the granules is extracted.
  • the third container acts as stocking and waiting position of the dried granules before they are sent to the thermo-moulding or thermo-extruder.
  • a duct with valves connects the bottom cover of the first container with the upper cover of the second container, while another duct connects the bottom cover of the second container with the upper cover of the third container. Suitable valves control the access to every container.
  • a vacuum pump is connected to the upper cover of the second container.
  • a device for the production of hot air and the transfer of the granules comprises an air sucker-compressor having downstream a heater and upstream a filter preceded by a system with three valves.
  • the outlet of the heater is connected with the bottom cover of the first container while the first valve draws the environment air, the second valve is connected to the upper cover of the second container, the third valve is connected with the upper cover of the third container.
  • the air sucked from the outside is heated and sent into the first container.
  • the air sucked from the second container causes a depression that sucks the granules from the first to the second container.
  • the air sucked from the third container causes a depression that sucks the granules from the second to the third container.
  • the air communication between the first and the second container is opened.
  • Figure 1 shows a schematic realization of the new dryer
  • figure 2a shows the flow-diagram of the product that needs to be dried
  • figure 2b is a schematic representation of the vacuum pump
  • figures 2c, 2d, 2e show the hot air cycle.
  • the new vacuum dryer comprises three containers (C1, C2, C3), at least one sucker-compressor (A), at least one heater (R), at least one filter (F), a group of valves (V).
  • Each container (C1, C2, C3) is made of a cylinder with open heads, preferably in metallic material, on each upper end of which a liftable cover is positioned.
  • the cylinder has a sealing gasket on both ends.
  • Each of the two covers is substantially made of a plate-shaped element, or a disc-shaped part with the edge bent on a side.
  • Each cover is provided with a gasket and adheres to the cylindrical part of the container so as to close the end of the removable cylinder and so to realize a hermetically closed container.
  • first container (C1) On the cylindrical part of the first container (C1), near to each of its open ends, there is a sensor that registers the presence or the absence of granules.
  • second (C2) and third (C3) container there is a sensor that registers the presence or the absence of granules in their bottom parts. Said sensors allow registering when the level of the granules has filled the container (C1, C2, C3) or when the container (C1, C2, C3) is completely empty.
  • the first container (C1) On the upper cover of the first container (C1) there is a hopper, suitable for the conveyance of the granules that have to be dried, and a drilled shutter for the partial closure of the run from the hopper to the inside of the container (C1).
  • the fist valve (V1) of the group of valves (V) draws the air from the environment.
  • the sucker-compressor (A) sends the filtered air through the heater (R) to the bottom cover of the first container (C1).
  • the granules of plastic material are poured into the hopper of the first container (C!) and from here they enter the first container (C1).
  • the first valve (V1) of the group of valves (V) is opened while the other two valves (V2, V3) are held closed.
  • the sucker-compressor (A) is operated for the sucking of the air from the environment through the filter (F) and the first valve (V1) and conveys it, through the heater (R), to the bottom cover of the first container (C1).
  • the air introduced in the first container (C1) is heated to a suitable temperature, and goes up and passes through the granules contained in the first container (C1) and then goes out partially through the drilled shutter and partially into the ambient through a filter.
  • the hot air that passes through the granules heats them and extracts part of the moisture from the granules.
  • the hot air that goes out from the drilled shutter strikes the granules of plastic material present in the hopper, thus pre-heating and pre-drying them.
  • valve (O1) between the first (C1) and the second (C2) container is opened, the first valve (V1) of the groups of valves (V) is closed and the second valve (V2) of the group of valves (V) is opened.
  • valve (O1) between the first (C1) and the second (C2) container is closed.
  • the vacuum pump of the second container (C2) is operated in a way to extract all the air and the possible moisture still present inside the granules themselves.
  • valve (O2) between the second (C2) and the third (C3) container is opened and the first (V1) and the second (V2) valves of the group of valves (V) are closed while the third valve (V3) is opened.
  • the new vacuum dryer particularly for granular plastic material as afore described has many advantages.
  • the entire drying, deep dehumidifying and stocking cycle is realized in a controlled atmosphere and without exposing the granules to the outside atmosphere, ensuring and maintaining the high dehumidification level up to the thermo-moulder and the thermo-extruder.
  • the hot air is re-used in other parts of the drying cycle without the necessity of drying and dehumidifying other air on the purpose. This implies a large decrease in the amount of the utilized energy and devices, that is a high yield of the new vacuum dryer.
  • the pre-heating of the granules before their introduction into the first container allows the elimination of the superfcial moisture of the granules and of the air around the granules, further optimising the yield of the new vacuum dryer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Drying Of Solid Materials (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
EP04425792A 2004-10-21 2004-10-21 Vakuumtrockner für körniges Kunststoffmaterial Withdrawn EP1650515A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04425792A EP1650515A1 (de) 2004-10-21 2004-10-21 Vakuumtrockner für körniges Kunststoffmaterial

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04425792A EP1650515A1 (de) 2004-10-21 2004-10-21 Vakuumtrockner für körniges Kunststoffmaterial

Publications (1)

Publication Number Publication Date
EP1650515A1 true EP1650515A1 (de) 2006-04-26

Family

ID=34932841

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04425792A Withdrawn EP1650515A1 (de) 2004-10-21 2004-10-21 Vakuumtrockner für körniges Kunststoffmaterial

Country Status (1)

Country Link
EP (1) EP1650515A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103673510A (zh) * 2013-05-14 2014-03-26 北京神雾环境能源科技集团股份有限公司 褐煤干燥方法和褐煤干燥系统
EP2982486A1 (de) 2014-08-04 2016-02-10 Andras Szücs Verfahren und Vorrichtung zum mechanischen Umformen von Kunststoffgranulat und mechanisch umgeformtes Kunststoffgranulat
US9452387B2 (en) 2014-10-10 2016-09-27 Meta Industrial Inc. Dehumidifying apparatus
EP3194133A4 (de) * 2014-09-16 2018-05-16 Gala Industries, Inc. Systeme und verfahren zum trocknen von pellets und anderen materialien
CN117054035A (zh) * 2023-10-12 2023-11-14 江苏烨培干燥工程有限公司 一种耙式干燥机的耙齿性能模拟测试系统

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE318127C (de) *
DE7401695U (de) * 1973-01-18 1975-04-24 Sintab Swedinventor Ab Vorrichtung zum Trocknen von Gut in flüssiger, fester, suspendierter oder granulierter Form, beispielsweise Blutplasma, Faulschwamm, Weidenfutter, Fisch, Getreide usw.
FR2438808A1 (fr) * 1978-10-12 1980-05-09 Tjurin Nikolai Procede de sechage de materiaux dielectriques sous forme de granules ou analogues et dispositif pour sa mise en oeuvre
DE8707216U1 (de) * 1987-05-20 1988-06-23 Gerco Apparatebau Gmbh & Co Kg, 4414 Sassenberg Vorratsbehälter und Trockner, insbesondere für Kunststoffgranulate
DE4300060A1 (de) * 1993-01-05 1994-07-07 Fasti Farrag & Stipsits Ges M Verfahren und Vorrichtung zum zweistufigen Trocknen von Trockengut
US6154980A (en) * 1997-09-19 2000-12-05 Maguire; Stephen B. Low pressure dryer

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE318127C (de) *
DE7401695U (de) * 1973-01-18 1975-04-24 Sintab Swedinventor Ab Vorrichtung zum Trocknen von Gut in flüssiger, fester, suspendierter oder granulierter Form, beispielsweise Blutplasma, Faulschwamm, Weidenfutter, Fisch, Getreide usw.
FR2438808A1 (fr) * 1978-10-12 1980-05-09 Tjurin Nikolai Procede de sechage de materiaux dielectriques sous forme de granules ou analogues et dispositif pour sa mise en oeuvre
DE8707216U1 (de) * 1987-05-20 1988-06-23 Gerco Apparatebau Gmbh & Co Kg, 4414 Sassenberg Vorratsbehälter und Trockner, insbesondere für Kunststoffgranulate
DE4300060A1 (de) * 1993-01-05 1994-07-07 Fasti Farrag & Stipsits Ges M Verfahren und Vorrichtung zum zweistufigen Trocknen von Trockengut
US6154980A (en) * 1997-09-19 2000-12-05 Maguire; Stephen B. Low pressure dryer

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103673510A (zh) * 2013-05-14 2014-03-26 北京神雾环境能源科技集团股份有限公司 褐煤干燥方法和褐煤干燥系统
CN103673510B (zh) * 2013-05-14 2016-06-22 北京神雾环境能源科技集团股份有限公司 褐煤干燥方法和褐煤干燥系统
EP2982486A1 (de) 2014-08-04 2016-02-10 Andras Szücs Verfahren und Vorrichtung zum mechanischen Umformen von Kunststoffgranulat und mechanisch umgeformtes Kunststoffgranulat
WO2016020712A1 (en) 2014-08-04 2016-02-11 Szücs András Method and apparatus for producing reshaped plastic granules
US10307936B2 (en) 2014-08-04 2019-06-04 András SZÜCS Method and apparatus for producing reshaped plastic granules
EP3194133A4 (de) * 2014-09-16 2018-05-16 Gala Industries, Inc. Systeme und verfahren zum trocknen von pellets und anderen materialien
US9452387B2 (en) 2014-10-10 2016-09-27 Meta Industrial Inc. Dehumidifying apparatus
CN117054035A (zh) * 2023-10-12 2023-11-14 江苏烨培干燥工程有限公司 一种耙式干燥机的耙齿性能模拟测试系统
CN117054035B (zh) * 2023-10-12 2023-12-19 江苏烨培干燥工程有限公司 一种耙式干燥机的耙齿性能模拟测试系统

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