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1. WO2020159507 - UNITÉ D'EXTRACTION DE LIQUIDE

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

1. Apparatus to extract liquid from a build chamber containing a build material and liquid, comprising:

a liquid extraction system to evaporate liquid in the build chamber;

a condenser to condense evaporated liquid into liquid;

a condensed liquid measurement module; and

a controller to determine when to stop the liquid extraction process based on the condensed liquid.

2. The apparatus of claim 1 , further comprising:

an airflow generator to generate an airflow through a build chamber to evaporate liquid therein and to flow the airflow through the condenser.

3. The apparatus of claim 1 , wherein the condensed liquid measurement module comprises at least one of: a load cell, to allow the weight of the condensed liquid to be determined; a liquid level sensor to allow volume of condensed liquid to be determined; and a camera.

4. The apparatus of claim 1 , further comprising:

a vacuum pump to remove air/gas from the build chamber to reduce the air pressure within the build chamber to cause liquid evaporation and to draw the removed air/gas through the condenser.

5. The apparatus of claim 1 , wherein the controller is to:

start the liquid extraction process;

stop the liquid extraction process by when it determines that the rate at which liquid is condensed by the condenser falls below a predetermined rate.

6. The apparatus of claim 1 , wherein the controller is to:

obtain an estimation of the amount of liquid present in the build chamber; start the liquid extraction process;

stop the liquid extraction process when it is determined that predetermined percentage of the estimated amount of liquid has been condensed by the condenser.

7. A method of removing liquid from a build chamber containing build material and liquid, the method comprising:

starting a liquid extraction process to extract liquid from the build chamber; and determining when a predetermined threshold of liquid has been removed from the build chamber, and thereby stopping the liquid extraction process.

8. The method of claim 7, further comprising:

generating an airflow through the build chamber to cause evaporation of liquid into the airflow;

condensing liquid in the airflow at a condenser; and

determining when to stop the liquid extraction process based on the condensed liquid.

9. The method of claim 7

removing airfrom the build chamber to reduce the internal pressure thereof to cause liquid therein to evaporate;

condensing liquid in the removed air at a condenser; and

determining when to stop the liquid extraction process based on the condensed liquid.

10. The method of claim 7, further comprising heating the contents of the build chamber to facilitate liquid evaporation.

1 1. The method of claim 10, wherein heating the contents of the build chamber comprises at least one of: generating an airflow having a temperature above ambient temperature; and applying convective and/or radiative heat to the contents of the build chamber to raise the temperature above ambient temperature.

12. The method of claim 8, further comprising determining when the rate at which liquid is condensed by the condenser falls below a predetermined rate.

13. The method of claim 8, further comprising:

obtaining an estimation of the amount of liquid present in the build chamber;

determining when the amount of condensed liquid is within a predetermined threshold of the obtained estimated amount.

14. A computer readable medium comprising processor understandable instructions that, when executed by the processor cause the processor to start a liquid extraction process to extract liquid from a build chamber comprising build material and print agent liquid; and

determine when a predetermined threshold of liquid has been removed from the build chamber, and thereby stopping the liquid extraction process.