Systems, devices, and methods for inkjet-based three-dimensional printing

Patent metadata

Field	Value
Publication number	US-11097464-B2
Application number	US-201715687211-A
Country	US
Kind code	B2
Filing date	Aug 25, 2017
Priority date	Aug 26, 2016
Publication date	Aug 24, 2021
Grant date	Aug 24, 2021

Abstract

Devices and methods are described that provide printing of three-dimensional objects using reactive materials such as materials that result in a polyurethane formulation. Three-dimensional printing in accordance with the present disclosure can be performed using an inkjet printer or other systems that deposit or dispense material. A formulation made up of two or more reactive materials and, optionally, one or more UV-curable materials is also provided. The materials can be jetted based on a desired configuration to achieve a maximum reaction between materials, and can be based on desired jetting or molar ratios. By heating or applying energy on the jetted materials, their reaction and related solidifying can be accelerated. Corrective printing is also provided for, and can be used at desired intervals to eliminate printing errors relative to the object as modeled. Systems and methods used in conjunction with all of the same are provided.

First claim

What is claimed is:

1. A method for printing in three dimensions, comprising:
ejecting a first fluid from a first nozzle onto a surface, the first fluid including a first material;
ejecting a second fluid from a second nozzle towards the surface, the second fluid including a second material that is configured to react with the first material to form a printed material; and
repeating the steps of ejecting the first fluid and the second fluid in layers to form an object,
wherein the first fluid and the second fluid are formulated and ejected such that the molar ratio between the first fluid and the second fluid substantially meets a target molar ratio, and
wherein after the first and second fluids are ejected from first and second nozzles, the resulting printed material solidifies so that the formed object is solid,
the method further comprising:
prior to a first iteration of the steps of the ejecting the first material and the second material, operating a controller to calculate a pattern for ejecting the first material and the second material,
wherein the steps of ejecting the first and second materials are performed in accordance with the pre-calculated pattern.

2. The method of claim 1 , wherein a catalyst is included as part of at least one of the first fluid and the second fluid.

3. The method of claim 1 ,
wherein the printed material is polyurethane,
wherein the first material comprises an isocyanate functional group, and
wherein the second material comprises at least one of a polyol functional group that is reactive with the isocyanate functional group, an amine that is reactive with the isocyanate functional group, a hydroxyl that is reactive with the isocyanate functional group, and a mixture of any of a polyol functional group, an amine, and a hydroxyl, the mixture being reactive with the isocyanate functional group.

4. The method of claim 1 , wherein each of the first and second fluids is solvent-free.

5. The method of claim 1 ,
wherein ejecting a first fluid from a first nozzle onto a surface further comprises ejecting a first fluid from a plurality of first nozzles onto a surface, and
wherein ejecting a second fluid from a second nozzle towards the surface further comprises ejecting a second fluid from a plurality of second nozzles towards the surface.

6. The method of claim 1 , further comprising:
operating a controller to adjust at least one of a droplet size of at least one of the first or second fluids ejected from the respective first or second nozzle, or a printing pattern that results from ejecting the first and second fluids to optimize a contact area of the printed object.

7. The method of claim 1 , further comprising:
operating a feedback loop to analyze a geometry of the printed material in real time; and
generating a compensation layer of material to compensate for errors identified in the operating step.

8. The method of claim 1 , wherein the pattern for ejecting the first and second materials is calculated to optimize at least one of one or more of a molar ratio and an interaction area between droplets of the first material and droplets of the second material among a number of layers.

9. The method of claim 8 , wherein the pattern is calculated to optimize at least one of:
(i) the interaction area between the droplets of the first material and the droplets of the second material, and preserve a given molar ratio between the droplets of the first material and the droplets of the second material;
(ii) the molar ratio between the droplets of the first material and the droplets of the second material; and
(iii) the molar ratio and the interaction area between the droplets of the first material and the droplets of the second material.

10. The method of claim 9 , wherein the pattern is calculated such that the molar ratio between the droplets of the first material and the droplets of the second material is not 50:50.

11. The method of claim 9 , wherein the pattern for ejecting the first and second materials is a checkerboard pattern.

12. The method of claim 9 , wherein the pattern for ejecting the first and second materials is a shifting checkerboard pattern.

13. The method of claim 1 ,
wherein ejecting a first fluid from a first nozzle onto a surface results in the formation of a first layer, and
wherein ejecting a second fluid from a second nozzle towards the surface results in the formation of a second layer.

14. The method of claim 1 ,
wherein ejecting a first fluid from a first nozzle onto a surface results in the formation of a first layer, and
wherein ejecting a second fluid from a second nozzle towards the surface results in the second fluid being added to the first layer.

15. The method of claim 1 , further comprising heating the layers of the first and second fluids after the first and second fluids have been ejected from the respective first and second nozzles.

16. The method of claim 1 , wherein the height of the object is at least about 1 millimeter.

17. The method of claim 1 , a combined molecular weight of the first fluid and the second fluid is less than a molecular weight of the printed material that results after the first and second materials react together.

18. The method of claim 1 , further comprising ejecting a third fluid from a third nozzle towards the surface, the third fluid include a third material that is an ultraviolet (UV)-curable material.

19. The method of claim 18 ,
wherein the first and second fluids are printed according to a first pattern and the third fluid is printed according to a second pattern.

20. The method of claim 1 , wherein the first fluid and the second fluid are formulated to achieve a target reaction rate between the first fluid and the second fluid.

21. The method of claim 1 , further comprising:
adding one or more additives to one or more of the first material and the second material prior a first iteration of the steps of ejecting the first fluid and the second fluid.

22. The method of claim 21 ,
wherein the one or more additives are configured to define one or more characteristics of the resulting printed material, and
wherein the one or more characteristics include at least one of physical, thermal, mechanical, biochemical, optical, electrical, or color properties.

23. The method of claim 1 , wherein the pattern for ejecting the first and second materials is calculated to optimize an interaction area between droplets of the first material and droplets of the second material among a number of layers.

Assignees

• Massachusetts Inst Technology

Inventors

• Matusik Wojciech
• Wang Wenshou
• Vidimce Kiril
• Ramos Javier

Classifications

• B33Y70/10

  Composites of different types of material, e.g. mixtures of ceramics and polymers or mixtures of metals and biomaterials · CPC title

• B33Y50/02

  for controlling or regulating additive manufacturing processes · CPC title

• B33Y10/00

  Processes of additive manufacturing · CPC title

• B29C64/307

  Handling of material to be used in additive manufacturing · CPC title

• B33Y30/00

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