EP1275921A2 - Vorrichtung mit einer Vakuumtrocknungskammer ausgerüstet mit Mechanismen zur einstellbaren Kompression des zu trocknenden Produktes - Google Patents

Vorrichtung mit einer Vakuumtrocknungskammer ausgerüstet mit Mechanismen zur einstellbaren Kompression des zu trocknenden Produktes Download PDF

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Publication number
EP1275921A2
EP1275921A2 EP02425457A EP02425457A EP1275921A2 EP 1275921 A2 EP1275921 A2 EP 1275921A2 EP 02425457 A EP02425457 A EP 02425457A EP 02425457 A EP02425457 A EP 02425457A EP 1275921 A2 EP1275921 A2 EP 1275921A2
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EP
European Patent Office
Prior art keywords
chamber
product
dried
mechanisms
drying chamber
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Withdrawn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
EP02425457A
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English (en)
French (fr)
Other versions
EP1275921A3 (de
Inventor
Elisabetta Puccetti
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1275921A2 publication Critical patent/EP1275921A2/de
Publication of EP1275921A3 publication Critical patent/EP1275921A3/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Withdrawn legal-status Critical Current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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B9/00—Machines or apparatus for drying solid materials or objects at rest or with only local agitation; Domestic airing cupboards
    • F26B9/006—Removable covering devices, e.g. pliable or flexible
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B2210/00—Drying processes and machines for solid objects characterised by the specific requirements of the drying good
    • F26B2210/16—Wood, e.g. lumber, timber

Definitions

  • the invention regards a device with a vacuum drying chamber equipped with mechanisms for the adjustable compression of the product to be dried.
  • the accelerated drying of products is quite common, where the internal humidity is reduced through industrial procedures.
  • One of these procedures contemplates the use of hermetically sealed drying chambers.
  • the product to be dried is placed inside these chambers, it is heated and, at the same time, inside the said chambers the air pressure is reduced to aid the evaporation of the internal humidity of what is to be dried.
  • the reduction of pressure stimulates the evaporation of the internal humidity of the product to be dried even when it is heated at a relatively low temperature, allowing, in this way, to accelerate the procedure and reduce the cost of the thermal energy used.
  • one of the previously known procedures contemplates the heating and the contemporary compression of the product to be processed.
  • At least one of the panel walls of the drying chamber is made of flexible material, so that the depression generated inside the drying chamber creates an inflexion, with the consequent compression of the product to be dried placed inside the same chamber.
  • This compression is strong if the internal decompression of the chamber is normally very high so as to aid in the evaporation of the internal liquid of the product to be dried, even when it is subjected to relatively low drying temperatures. If on the one hand all of this is advantageous since it helps to obtain undeformed dried products, on the other it is problematic because the compression is un-controllable, that is it cannot be adjusted independently from the vacuum created inside the chamber. Due to this reason the normal shrinkage due to the evaporation of the internal humidity of the compressed product is impeded, so that, in some cases, great stresses are generated inside it, causing the breakage of the said product, therefore in some cases its destruction.
  • the aim of the present invention is the production of a device with vacuum drying chamber equipped with mechanisms to allow the adjustable compression of the product to be dried. In this way it is possible to use a high vacuum pressure inside the chamber that houses the product to be dried, and a compression of the same product that will not cause damage to it.
  • the invention that has permitted us to obtain these results is composed of a device with an hermetically sealed drying chamber, equipped with previously known heating mechanisms, with a first chamber that is appropriate for housing the product to be dried, with a second adjustment and compensation chamber and with a panel wall in flexible material which separates the two chambers.
  • the latter is capable of inflecting towards the inside of the first chamber and to generate the compression effect on the product to be dried, due to a greater vacuum inside the first chamber versus the second.
  • Said device is also equipped with the mechanisms for generating and regulating said vacuum so as to control the "suction" effect on the said flexible membrane, exercised by the greater vacuum in the first chamber versus the second.
  • Such an invention is particularly advantageous since inside the two chambers, the degree of vacuum, produced by previously known mechanisms, can be finely adjusted.
  • the adjustment in the first chamber allows us to obtain a high evaporation speed in the product to be dried and that is placed inside it.
  • the adjustment in the second chamber allows us to obtain a difference in the vacuum levels in the two chambers, that is capable of operating a compression, on the product to be dried, with the desired pressure value and such as to prevent the irregular geometric deformations caused by its drying, without damaging the product.
  • the chamber is normally shaped like a parallelepiped, with a rigid top panel wall 2 connected along a closed line with the airtight and flexible membrane 5, this is appropriate for dividing the inside of the drying chamber 1 into a first chamber 3, the one intended to house the product to be dried, and into a second chamber 4.
  • Said membrane 5 is capable of inflecting towards the chamber 3 and, in said inflection, to effect the compression of the product 7 to be dried.
  • the drying chamber is also equipped with, according to one of its first embodiment, an apparatus containing an appropriate vacuum pump 8 with which the gasses are aspirated from the chambers 3 and 4, so as to generate two different states of vacuum in the said chambers. In particular in chamber 3, where the product to be dried is housed, a higher vacuum than in chamber 4 is generated.
  • the drying chamber is therefore equipped with the appropriate mechanisms 11 and 12 to read the pressures inside said chambers 3 and 4, while the combined device with chamber 1 is equipped with valves 13 and 18 with which the regulation of airflows, respectively into and out of the chamber 4 to adjust the state of the vacuum inside it.
  • the device associated with the drying chamber 1 also includes the appropriate mechanisms 30, normally programmed, for the adjustment of the said valves 13 and 18. They allow the regulation of the amount of vacuum in the chamber 3, therefore the regulation of the difference in pressure between the chambers 3 and 4 and therefore the compressing action exercised by the flexible membrane 5 on the product 7 to be dried.
  • the chamber 3 is brought to a state of vacuum so that the membrane 5 can effect its compressing action; said chamber is equipped with at least one input valve 10, normally adjustable by hand. It permits the restoration of external atmospheric pressure in chamber 3 when, at the end of the drying process, entry into the same chamber 3 is required and the termination of the pressing action of the membrane 5 is also required to allow the extraction of the dried product.
  • the adjustment can be effected by substituting one of the two valves 13 and 18 with a calibrated airflow orifice and by operating on the remaining valve.
  • the apparatus that is associated with the drying chamber 1 foresees the presence of an adjustment servomechanism 30, normally of the programmable type, through which we can control the difference in vacuum pressure, between chambers 3 and 4, which is registered by the sensors 11 and 12.
  • Said servomechanism 30 permits therefore, on the one hand the adjustment of vacuum pressure in chamber 3, on the other hand the adjustment of the compression exercised by the flexible membrane 5 on the product to dried.
  • An alternative system for the modulation of the compression that is exercised by the membrane 5, on the product to be dried, is that represented in the enclosed drawing 2.
  • the system is composed of the vacuum drying chamber 3, of the hermetically sealed type, in which one panel wall is connected, along a closed line, with the airtight flexible membrane 5 that is capable of compressing the product to be dried 7 by means of a rigid plate 20.
  • the hydraulic pistons 21, or other equivalent counter reacting systems capable of exercising on the same plate 20 a force that counters that of the membrane 5.

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)
EP02425457A 2001-07-12 2002-07-11 Vorrichtung mit einer Vakuumtrocknungskammer ausgerüstet mit Mechanismen zur einstellbaren Kompression des zu trocknenden Produktes Withdrawn EP1275921A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2001AR000017A ITAR20010017A1 (it) 2001-07-12 2001-07-12 Impianto di essiccazione sottovuoto con mezzi per lo schiacciamento regolabile del prodotto da essiccare.
ITAR20010017 2001-07-12

Publications (2)

Publication Number Publication Date
EP1275921A2 true EP1275921A2 (de) 2003-01-15
EP1275921A3 EP1275921A3 (de) 2006-06-14

Family

ID=11437614

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02425457A Withdrawn EP1275921A3 (de) 2001-07-12 2002-07-11 Vorrichtung mit einer Vakuumtrocknungskammer ausgerüstet mit Mechanismen zur einstellbaren Kompression des zu trocknenden Produktes

Country Status (2)

Country Link
EP (1) EP1275921A3 (de)
IT (1) ITAR20010017A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2854831A1 (fr) * 2003-05-15 2004-11-19 Gie Le Bois Pyrogene Four destine au traitement du bois a haute temperature, et installation et procede pour sa mise en oeuvre
CN102538408A (zh) * 2012-01-10 2012-07-04 成都市双虎实业有限公司 一种加工木板材原料的真空干燥方法
EP4276398A1 (de) * 2022-05-09 2023-11-15 Reinhard Brunner Kanal-trocknungsvorrichtung

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1660102B1 (de) * 1962-09-24 1970-09-03 Bocciardo Paolo Vakuumtrockenvorrichtung fuer Leder od.dgl.
US3321842A (en) * 1962-11-06 1967-05-30 Bocciardo Paolo Process and means for the stepwise drying under vacuum and successive conditioning, in a continuous operation, of tanned skins and the like
DD226922A1 (de) * 1984-08-08 1985-09-04 Textima Veb K Verfahren zum entwaessern von nassem gut sowie vorrichtung hierfuer
IT1180094B (it) * 1984-10-15 1987-09-23 Vincenzo Pagnozzi Essicatoio a vuoto per legnami segati

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2854831A1 (fr) * 2003-05-15 2004-11-19 Gie Le Bois Pyrogene Four destine au traitement du bois a haute temperature, et installation et procede pour sa mise en oeuvre
CN102538408A (zh) * 2012-01-10 2012-07-04 成都市双虎实业有限公司 一种加工木板材原料的真空干燥方法
EP4276398A1 (de) * 2022-05-09 2023-11-15 Reinhard Brunner Kanal-trocknungsvorrichtung

Also Published As

Publication number Publication date
EP1275921A3 (de) 2006-06-14
ITAR20010017A1 (it) 2003-01-12
ITAR20010017A0 (it) 2001-07-12

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