Method for electrical pre-drying of a ceramic blank
AssigneeLapp Insulators GmbH
InventorsSimon Hofmann, Michael Judge
Life of this patent
Estimating the term…
Abstract
A method for electrically predrying a moist blank of a ceramic raw mixture is provided, the blank being connected into a circuit and an alternating current being passed through the blank. In this case, the alternating current is passed through the blank at an increased frequency in comparison with the mains frequency. Significantly less electrical energy is required to achieve an identical drying result.
Claims20
Method for electrically predrying a moist blank formed of a ceramic raw mixture, comprising:
- coupling a moist blank of ceramic material to a circuit;
- and
- applying an alternating current through the blank at a frequency sufficiently high that a current density of alternating current flowing through the blank is concentrated in a moist skin layer of the blank during the applying,
- wherein the skin layer within which current flow is concentrated during the applying migrates from an outer periphery of the blank inwardly as moisture is expelled outwardly of the blank.
The method according to 1, wherein the blank is subjected to an alternating voltage of between 300 V and 500 V during the applying.
Method for electrically predrying a moist blank of a ceramic raw mixture, comprising:
- connecting the blank into a circuit;
- and
- passing alternating current through the blank such that a current density of the alternating current is concentrated, by skin effect, within a moist skin layer of the blank,
- wherein the moist skin layer where alternating current is concenrated migrates from an outer periphery of the blank inwardly as moisture is expelled to the outside of the blank during the applying, and
- wherein the alternating current is passed through the blank at a frequency of between 300 Hz and 1000 Hz.
Dependencies are inferred from the claim text.