公开(公告)号：US20210197455A1

公开(公告)日：2021-07-01

申请号：US16077752

申请日：2017-07-14

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Shannon Reuben WOODRUFF ,  Ali EMAMJOMEH ,  Yi FENG ,  Erica FUNG ,  Carolin FLEISCHMANN ,  Geoffrey SCHMID

IPC: B29C64/165 ,  B33Y70/00

Abstract: This disclosure relates to a method of 3-D printing comprising: applying a layer of build material onto a print platform, wherein the build material comprises particles of a polymer comprising polymer chains having at least one reactive group that is protected with a protecting group; printing a de-protecting agent at selected locations on the layer of build material; and coalescing particles of the polymer at the printed locations on the layer of build material to form a coalesced polymer layer.

公开(公告)号：US20190054690A1

公开(公告)日：2019-02-21

申请号：US16074492

申请日：2016-12-08

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Yi FENG ,  Jesiska TANDY ,  Rachael DONOVAN

IPC: B29C64/165 ,  B29C64/20 ,  B29C64/314 ,  B33Y30/00 ,  B33Y70/00

Abstract: A material set can include a powder bed material, including a polymer powder and a fusing agent. The polymer powder can have a particle size distribution having the following profile: D10 of 30 μm or more, D50 from 50 μm to 65 μm, and D90 of 100 ? m or less. Other parameters can include a melting point from 100° C. to 300° C., a processing window temperature of 20° C. or more, an energy density absorption of 20% or less, and a melt flow index from 10 cc to 80 cc at 10 minutes. The fusing agent can include an energy absorber capable of absorbing electromagnetic radiation to produce heat.

公开(公告)号：US20190030802A1

公开(公告)日：2019-01-31

申请号：US16073278

申请日：2016-05-13

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Yi FENG ,  Erica Montei FUNG ,  Michael A. NOVICK

IPC: B29C64/165 ,  C08K3/04

Abstract: The present disclosure is drawn to material sets for 3-dimensional printing, 3-dimensional printing systems, and 3-dimensional printed parts. A material set can include a polyamide polymer powder having an average particle size from 20 μm to 120 μm and a fusing agent. The polyamide-11 can have a solution viscosity from 1.5 to 1.75 at room temperature, and may increase by no more than 5% after exposure to 180° C. for 20 hours. The fusing agent can include an energy absorber capable of absorbing electromagnetic radiation to produce heat.