Systems for negative 3D printing machine at high resolution

Patent metadata

Field	Value
Publication number	US-11697245-B2
Application number	US-202117453723-A
Country	US
Kind code	B2
Filing date	Nov 5, 2021
Priority date	May 11, 2020
Publication date	Jul 11, 2023
Grant date	Jul 11, 2023

Abstract

Methods and apparatus for the fabrication of solid three-dimensional objects from liquid polymerizable materials at high resolution. A material is coated on a film non-digitally, excess material is removed digitally, by laser, leaving an image of a layer to be printed, and the image is then engaged with existing portions of an object being fabricated and exposed to a non-digital UV curing light source. Since the only part of the process that is digital is the material removal, and this part is done by laser, the speed of printing and the robustness of the manufacturing process is improved significantly over conventional additive or 3D fabrication techniques.

First claim

What is claimed is:

1. A system, comprising a coating system configured to coat a substrate with a uniform layer of liquid polymerizable material and provide the coated substrate to a negative printing unit, the negative printing unit configured to remove portions of the liquid polymerizable material from the coated substrate and provide a resulting version of the coated substrate with remaining segments of the liquid polymerizable material to a sample building unit that is spatially separated from the negative printing unit, the sample building unit configured to engage the coated substrate with the remaining segments of the liquid polymerizable material that represents an image of a layer of an article under fabrication with a sample and cure said remaining segments of the liquid polymerizable material with ultra-violet (UV) light when the remaining segments of the liquid polymerizable material are in contact with the sample.

2. The system of claim 1 , wherein the coating system includes one of:
a screen-printing module configured to coat the liquid polymerizable material on a screen or stencil of film with well-defined holes using a blade or a squeegee, and further to subsequently transfer the liquid polymerizable material to the substrate in a soft or hard engage; a dispenser configured to print the liquid polymerizable material onto the substrate;
an inkjet head configured to print the liquid polymerizable material onto the substrate;
a gravure or micro-gravure system configured to coat the substrate with the uniform layer of the liquid polymerizable material;
a slot-die system configured to coat the substrate with the uniform layer of the liquid polymerizable material;
a roller coating system configured to coat the substrate with the uniform layer of the liquid polymerizable material; and
a syringe of the liquid polymerizable material, a pump that drives the liquid polymerizable material from the syringe onto the substrate, and an actuator which is configured to transport the coated substrate towards and through a gap between rollers or knifes to create the uniform layer of the liquid polymerizable material on the substrate with a thickness that is defined by the gap.

3. The system of claim 2 , wherein the coating system is inside a closed cell with a controlled environment.

4. The system of claim 2 , wherein the coating system is configured to coat the substrate with more than one liquid polymerizable material.

5. The system of claim 2 , wherein the coating system includes the gap and is configured to translate the substrate bidirectionally through the coating system while adjusting a width of the gap.

6. The system of claim 2 , wherein the liquid polymerizable material is a UV light curable material.

7. The system of claim 2 , wherein the negative printing unit is a laser-based system that contains a laser configured to jet material from the coated substrate to a material reuse system.

8. The system of claim 2 , wherein the substrate is one of: a continuous transparent film substrate, a transparent film substrate coated by a metal layer, or a transparent film substrate coated by a metal layer and a dielectric layer.

9. The system of claim 2 , further comprising a support material addition unit configured to inject support material on the sample.

Assignees

• Io Tech Group Ltd

Inventors

• Gilan Ziv
• Zenou Michael
• Nesher Guy

Classifications

• B29C64/357

  Recycling · CPC title

• B33Y40/20

  Post-treatment, e.g. curing, coating or polishing · CPC title

• B29C64/112

  using individual droplets, e.g. from jetting heads · CPC title

• B29C64/129

  characterised by the energy source therefor, e.g. by global irradiation combined with a mask · CPC title

• B29C35/0805

  using electromagnetic radiation · CPC title