GB781444A - Improvements relating to high frequency electrical generators for dielectric heating - Google Patents

Improvements relating to high frequency electrical generators for dielectric heating

Info

Publication number
GB781444A
GB781444A GB2560152A GB2560152A GB781444A GB 781444 A GB781444 A GB 781444A GB 2560152 A GB2560152 A GB 2560152A GB 2560152 A GB2560152 A GB 2560152A GB 781444 A GB781444 A GB 781444A
Authority
GB
United Kingdom
Prior art keywords
frequency
dielectric
electrodes
voltage
maximum
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
GB2560152A
Inventor
Arthur Thomas Kinder
Kenneth Wilfred Brook
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.)
Metropolitan Vickers Electrical Co Ltd
Original Assignee
Metropolitan Vickers Electrical Co 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 Metropolitan Vickers Electrical Co Ltd filed Critical Metropolitan Vickers Electrical Co Ltd
Priority to GB2560152A priority Critical patent/GB781444A/en
Publication of GB781444A publication Critical patent/GB781444A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/04—Dielectric heating, e.g. high-frequency welding, i.e. radio frequency welding of plastic materials having dielectric properties, e.g. PVC
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/46—Dielectric heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
  • Control Of High-Frequency Heating Circuits (AREA)

Abstract

781,444. Dielectric heating. METROPOLITAN-VICKERS ELECTRICAL CO., Ltd. Sept. 22, 1953 [Oct. 13, 1952], No. 25601/52. Class 39(3) [Also in Group XL(c)] A high frequency generator is coupled to dielectric heater electrodes through an inductive coupling which is overcoupled such that at the frequency employed the voltage output over the working band of frequencies will be a maximum at each end of the band, and will have a reduced value intermediate the extreme frequencies, and the apparatus is so adjusted that with the dielectric load material cold the frequency is on the outer slope of the frequency characteristic,. whilst when the material heats up the frequency drifts through the adjacent maximum towards the further maximum. With such an arrangement a process of heating a dielectric material whose dielectric constant varies with its temperature consists in causing such variation to vary the resonant frequency of the load circuit such as initially to build up the voltage across the electrodes between which the material is placed over a prescribed time interval, and with further rise in temperature of the material to maintain a working voltage across the electrodes for a further period. During the voltage build-up the electrodes may be pressed together to remove air gaps in the material which may cause sparking. Specification 781,443 [Group VIII ]is referred to.
GB2560152A 1952-10-13 1952-10-13 Improvements relating to high frequency electrical generators for dielectric heating Expired GB781444A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2560152A GB781444A (en) 1952-10-13 1952-10-13 Improvements relating to high frequency electrical generators for dielectric heating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2560152A GB781444A (en) 1952-10-13 1952-10-13 Improvements relating to high frequency electrical generators for dielectric heating

Publications (1)

Publication Number Publication Date
GB781444A true GB781444A (en) 1957-08-21

Family

ID=10230330

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2560152A Expired GB781444A (en) 1952-10-13 1952-10-13 Improvements relating to high frequency electrical generators for dielectric heating

Country Status (1)

Country Link
GB (1) GB781444A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0945247A2 (en) * 1998-03-25 1999-09-29 Idemitsu Petrochemical Co., Ltd. Sealing of polyolefin-based resin, and sealed article of the resin

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0945247A2 (en) * 1998-03-25 1999-09-29 Idemitsu Petrochemical Co., Ltd. Sealing of polyolefin-based resin, and sealed article of the resin
EP0945247A3 (en) * 1998-03-25 2001-04-11 Idemitsu Petrochemical Co., Ltd. Sealing of polyolefin-based resin, and sealed article of the resin

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