Method for preparing a surface for extrusion deposition modeling
In the context of an extrusion deposition modeling to form three-dimensional objects, adhesion of extruded materials to a build surface is achieved by preparing the build surface using an intermediary coating that substantially adheres to the build surface, and a bondable particulate material, applied to the intermediary coating, that becomes affixed to the intermediary coating and provides a surface to which the extruded materials may attach.
1. A process, in an extrusion deposition modeling system, for preparing and using a surface of a build plate to provide a bondable surface to a first material to be deposited onto the build plate by extrusion, the process comprising:
applying, in a first application to the surface of the build plate, an intermediary coating as a flowable liquid, wherein the intermediary coating is formulated to substantially adhere to the build plate, to become more rigid after application to the build plate and to maintain rigidity when heated to a target temperature that is above 120° C.;
in a second application to the surface of the build plate, subsequent to the first application, applying to the intermediary coating a bondable particulate material comprising fine particles of a second material in solid form, wherein at least some of the bondable particulate material becomes affixed onto the intermediary coating without being fully engulfed by the intermediary coating, leaving the second material partially exposed;
heating the build plate to a target tem that is above 120° C.;
depositing, by extrusion, the first material onto the bondable particulate material in the course of constructing a solid object made from the first material and supported by the build plate, wherein the deposited first material makes direct contact with the second material and wherein at least a portion of the depositing occurs while the build plate is above 120° C. and wherein the intermediary coating rigidly affixes the bondable particulate material in a fixed position relative to the build plate while the build plate is at a target temperature that is above 120° C.;
detaching the solid object from the build plate by destruction of the intermediary coating, wherein at least a portion of the bondable particulate material remains attached to the solid object after destruction of the intermediary coating; and
cleaning the build plate by removing remnants of the intermediary coating from the build plate.
2. The process of claim 1 wherein the bondable particulate material is of substantially the same composition as the first material.
3. The process of claim 1 wherein the bondable particulate material is a substance to which the first material bonds as the first material is extruded.
4. The process of claim 1 wherein the first material does not bond directly to the intermediary coating.
5. The process of claim 1 wherein the bondable particulate material becomes affixed to the intermediary coating such that a first amount of force is required to detach the fine particles from the intermediary coating, and further comprising the step of:
performing a conditioning process on the intermediary coating such that a second amount of force, greater than the first amount of force, is required to detach the fine particles during or after the conditioning process.
6. The process of claim 5 wherein the conditioning process further comprises one or more of the following actions upon the intermediary coating: heating, drying, condensing, crosslinking, polymerizing, crystallizing, catalysis, or photonic excitation.
7. The process of claim 6 wherein the conditioning process involves raising the temperature of the intermediary coating to above 120° C.
8. The process of claim 1 wherein the intermediary coating further comprises a carbohydrate substance dissolved in a polar solvent.
9. The process of claim 8 wherein the intermediary coating further comprises a solution made of sucrose dissolved in water.
10. The process of claim 1 wherein the first material is polyetherimide.
11. The process of claim 1 wherein the first material further comprises one or more polymers selected from the group consisting of polyketone, polyetherketone, polyetheretherketone and polyetherketoneketone.
12. The process of claim 1 wherein the first material is insoluble in at least one ketone group solvent.
13. The process of claim 1 wherein the first material has a glass transition temperature above 200° C.
14. The process of claim 1 wherein said bondable particulate material comprises a polymer material that does not adhere to the build plate.
15. The process of claim 1 wherein the surface of the build plate further comprises a metallic surface and the first material does not adhere to the metallic surface directly.
16. The process of claim 15 wherein the metallic surface further comprises iron.
17. The process of claim 1 wherein the intermediary coating contains at least one protein.
18. The process of claim 1 wherein the first material, while being deposited by extrusion, partially engulfs the exposed portions of the fine particles of the bondable particulate material.