FUSING THREE-DIMENSIONAL (3D) OBJECT LAYERS

WIPO Patent Application WO/2020/027819

A9

In an example implementation, a method of fusing a 3D object layer includes, with a non-scanning, stationary energy system positioned over a work area, simultaneously irradiating the entirety of the work area uniformly with fusing light, wherein a carriage casts a shadow onto a portion of the work area and prevents fusing light from irradiating the portion of the work area when positioned between the fusing light and the work area. The method includes, with a first pass of the carriage from a first side to a second side of the work area, spreading a first layer of build material and dispensing a liquid fusing agent onto the first layer such that exposure time to the fusing light is unequal across the first layer, and with a second pass, returning the carriage to the first side. The method includes spreading a next layer of build material and dispensing a liquid fusing agent onto the next layer with a third pass of the carriage from the first side to the second side, such that the exposure time to the fusing light is made equal across the first layer.

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POST ALVIN (US)
EWALD BRENT (US)

PCT/US2018/044688

March 05, 2020

July 31, 2018

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HEWLETT PACKARD DEVELOPMENT CO (US)

B29C64/165; B29C64/153; B29C64/194; B29C64/218; B29C64/343; B33Y10/00

LEMMON, Marcus et al. (US)

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