GB988372A - Improvements in or relating to vacuum freeze drying processes - Google Patents

Improvements in or relating to vacuum freeze drying processes

Info

Publication number
GB988372A
GB988372A GB42950/61A GB4295061A GB988372A GB 988372 A GB988372 A GB 988372A GB 42950/61 A GB42950/61 A GB 42950/61A GB 4295061 A GB4295061 A GB 4295061A GB 988372 A GB988372 A GB 988372A
Authority
GB
United Kingdom
Prior art keywords
bridge
heating apparatus
dried
freeze drying
measuring instrument
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.)
Expired
Application number
GB42950/61A
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.)
Leybold Anlagen Holding AG
Original Assignee
Leybold Anlagen Holding AG
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 Leybold Anlagen Holding AG filed Critical Leybold Anlagen Holding AG
Publication of GB988372A publication Critical patent/GB988372A/en
Expired legal-status Critical Current

Links

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
    • F26B5/06—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 the process involving freezing
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
    • G05D23/1909—Control of temperature characterised by the use of electric means using an analogue comparing device whose output amplitude can only take two discrete values
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/20—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature
    • G05D23/24—Control of temperature characterised by the use of electric means with sensing elements having variation of electric or magnetic properties with change of temperature the sensing element having a resistance varying with temperature, e.g. a thermistor

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Automation & Control Theory (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Drying Of Solid Materials (AREA)

Abstract

988,372. Automatic temperature control systems for vacuum freeze drying apparatus. LEYBOLD-ANLAGEN HOLDING A.G. Nov. 30, 1961 [Dec. 1,1960], No. 42950/61. Heading G3R. An automatic temperature control system for controlling the heating apparatus used in a vacuum freeze drying process in which the material to be dried is initially frozen into a solid state and then placed in a vacuum chamber wherein the material is dried by sublimation has the heating apparatus of the vacuum chamber controlled with the aid of temperature responsive resistors connected in a Wheatstone bridge, the temperature responsive resistor 1 being embedded in the material to be dried, the temperature responsive resistor 2 being placed adjacent the heating apparatus 7 and the resistors 3,4 being placed in a chamber the temperature of which is maintained constant, a measuring instrument 5 being placed across the diagonal of the bridge, the constants 13,14 of which instrument are operated to energize the heating apparatus 7 and a cooling apparatus 8 such that the heating of the vacuum chamber is maintained at a point to cause drying of the frozen material by sublimation thereof. In a second embodiment the two resistors 1, 2 are placed in the same arm of the bridge and the cooling apparatus 8 excluded whilst in a further embodiment the measuring instrument 5 is protected against overload by the provision of a further, relatively insensitive, measuring instrument which is operative when the bridge is severely unbalanced. A transistorised amplifying element may be included in the bridge diagonal.
GB42950/61A 1960-12-01 1961-11-30 Improvements in or relating to vacuum freeze drying processes Expired GB988372A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL37705A DE1135832B (en) 1960-12-01 1960-12-01 Electric temperature control device for freeze-drying goods

Publications (1)

Publication Number Publication Date
GB988372A true GB988372A (en) 1965-04-07

Family

ID=7267996

Family Applications (1)

Application Number Title Priority Date Filing Date
GB42950/61A Expired GB988372A (en) 1960-12-01 1961-11-30 Improvements in or relating to vacuum freeze drying processes

Country Status (2)

Country Link
DE (1) DE1135832B (en)
GB (1) GB988372A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4672177A (en) * 1985-11-12 1987-06-09 International Business Machines Corporation Environmental sensor control of a heated fuser

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1218958B (en) * 1963-01-18 1966-06-08 Siemens Elektrogeraete Gmbh Automatic switch-off device for a hot air dryer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4672177A (en) * 1985-11-12 1987-06-09 International Business Machines Corporation Environmental sensor control of a heated fuser

Also Published As

Publication number Publication date
DE1135832B (en) 1962-08-30

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