Three-dimensional printing with build plates having surface topologies for increasing permeability and related methods

Patent metadata

Field	Value
Publication number	US-11518096-B2
Application number	US-202117150102-A
Country	US
Kind code	B2
Filing date	Jan 15, 2021
Priority date	Jan 13, 2015
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

A build plate for a three-dimensional printer includes: a rigid, optically transparent, gas-impermeable planar base having an upper surface and a lower surface; and a flexible, optically transparent, gas-permeable sheet having an upper and lower surface, the sheet upper surface comprising a build surface for forming a three-dimensional object, the sheet lower surface positioned on the base upper surface. The build plate includes a gas flow enhancing feature configured to increase gas flow to the build surface.

First claim

That which is claimed is:

1. A build plate for a three-dimensional printer comprising:
a rigid, optically transparent, gas-impermeable planar base having an upper surface and a lower surface;
a flexible, optically transparent, gas-permeable sheet having an upper and lower surface, the sheet upper surface comprising a build surface for forming a three-dimensional object;
a gas-permeable adhesive layer positioned between the planar base and the sheet, the adhesive layer configured to adhere the sheet to the planar base; and
a channel layer between the planar base and the sheet, wherein the channel layer comprises a first material and the base comprises a second material that is different from the first material;
wherein the channel layer defines channels therein to provide a gas flow enhancing feature configured to increase gas flow to the build surface.

2. The build plate of claim 1 , wherein the channel layer is gas permeable, wherein the channel layer comprises a permeable polymer including poly(dimethylsiloxane) (PDMS).

3. The build plate of claim 1 , wherein the channel layer defines channels on a bottom surface opposite the adhesive layer.

4. The build plate of claim 1 , wherein the channel layer is adhered to the base by chemical bonding including oxidative treatment comprising oxygen plasma treatments, UV ozone treatments and/or wet chemical treatments.

5. The build plate of claim 1 , wherein the adhesive layer comprises a gas-permeable adhesive, and wherein the adhesive layer comprises a poly(dimethylsiloxane) (PDMS) film.

6. The build plate of claim 1 , wherein the second material comprises sapphire, glass and/or quartz.

7. The build plate of claim 1 , further comprising an elastomeric layer between the channel layer and the base configured to increase an elasticity of the build plate.

8. The build plate of claim 1 , wherein the gas-permeable sheet and/or channel layer comprises a poly(dimethylsiloxane) (PDMS) composite comprising fluorescent, oxygen-sensing particles for sensing oxygen.

9. The build plate of claim 7 , wherein the gas-permeable sheet, elastomeric layer, and/or channel layer comprises a poly(dimethylsiloxane) (PDMS) composite comprising electrically conductive particles for heating a portion of the build plate.

10. The build plate of claim 1 , further comprising an additional adhesive layer, wherein the additional adhesive layer is positioned on the base upper surface and the channel layer is a mesh layer positioned on the additional adhesive layer opposite the base, and wherein the adhesive layer is positioned between the sheet lower surface and the mesh layer to adhere the sheet to the mesh layer.

11. The build plate of claim 10 , wherein the mesh layer comprises a polyester screen mesh or a fiberglass fabric, wherein the mesh layer is optically transparent.

12. An apparatus for forming a three-dimensional object from a polymerizable liquid, comprising:
(a) a support;
(b) a carrier operatively associated with said support on which carrier said three-dimensional object is formed;
(c) an optically transparent member having a build surface, with said build surface and said carrier defining a build region therebetween;
(d) a liquid polymer supply operatively associated with said build surface and configured to supply polymerizable liquid into said build region for solidification or polymerization;
(e) a radiation source configured to irradiate said build region through said optically transparent member to form a solid polymer from said polymerizable liquid;
(f) optionally at least one drive operatively associated with either said transparent member or said carrier;
(g) a controller operatively associated with said carrier and said radiation source and configured to control for advancing said carrier away from said build surface to form said three-dimensional object from said solid polymer;
wherein said optically transparent member comprises a build plate comprising:
a rigid, optically transparent, gas-impermeable planar base having an upper surface and a lower surface;
a flexible, optically transparent, gas-permeable sheet having an upper and lower surface, the sheet upper surface comprising a build surface for forming a three-dimensional object;
a gas-permeable adhesive layer positioned between the planar base and the sheet, the adhesive layer configured to adhere the sheet to the planar base; and
a channel layer between the planar base and the sheet, wherein the channel layer comprises a first material and the base comprises a second material that is different from the first material;
wherein the channel layer defines channels therein to provide a gas flow enhancing feature configured to increase gas flow to the build surface.

13. The apparatus of claim 12 , wherein the channel layer is gas permeable, wherein the channel layer comprises a permeable polymer including poly(dimethylsiloxane) (PDMS).

14. The apparatus of claim 12 , wherein the channel layer defines channels on a bottom surface opposite the adhesive layer.

15. The apparatus of claim 12 , wherein the channel layer is adhered to the base by chemical bonding including oxidative treatment comprising oxygen plasma treatments, UV ozone treatments and/or wet chemical treatments.

16. The apparatus of claim 12 , wherein the adhesive layer comprises a gas-permeable adhesive, and wherein the adhesive layer comprises a poly(dimethylsiloxane) (PDMS) film.

17. The apparatus of claim 12 , wherein the second material comprises sapphire, glass and/or quartz.

18. The apparatus of claim 12 , further comprising an elastomeric layer between the channel layer and the base configured to increase an elasticity of the build plate.

19. The apparatus of claim 12 , wherein the gas-permeable sheet and/or channel layer comprises a poly(dimethylsiloxane) (PDMS) composite comprising fluorescent, oxygen-sensing particles for sensing oxygen.

20. The apparatus of claim 19 , wherein the gas-permeable sheet, elastomeric layer, and/or channel layer comprises a poly(dimethylsiloxane) (PDMS) composite comprising electrically conductive particles for heating a portion of the build plate.

21. The apparatus of claim 12 , further comprising an additional adhesive layer, wherein the additional adhesive layer is positioned on the base upper surface and the channel layer is a mesh layer positioned on the additional adhesive layer opposite the base, and wherein the adhesive layer is positioned between the sheet lower surface and the mesh layer to adhere the sheet to the mesh layer.

22. The apparatus of claim 21 , wherein the mesh layer comprises a polyester screen mesh or a fiberglass fabric, wherein the mesh layer is optically transparent.

Assignees

• Carbon Inc

Inventors

• Moore David
• Tumbleston John R
• Samulski Edward T
• Ermoshkin Alexander
• Rolland Jason P
• Herrmann Ariel M
• Feller Bob E

Classifications

• B29C71/0009

  using liquids, e.g. solvents, swelling agents (spectacle cases, e.g. for cleaning contact lenses A45C11/04; disinfecting or sterilising contact lenses A61L12/00, using liquid substances A61L2/20; cleaning involving the use of liquid in general B08B3/00; for hydrating contact lenses B29D11/00067) · CPC title

• B29C2035/0855

  using microwave · CPC title

• B29C64/124

  using layers of liquid which are selectively solidified · CPC title

• B33Y30/00

  Apparatus for additive manufacturing; Details thereof or accessories therefor · CPC title

• G03F7/70416

  2.5D lithography · CPC title