Methods for curing partially polymerized parts

• US 5,164,128 A
• Filed: 04/02/1991
• Issued: 11/17/1992
• Est. Priority Date: 04/18/1988
• Status: Expired due to Term

• Current Assignee: 3D Systems, Inc. (3D Systems Corporation)
• Original Assignee: 3D Systems, Inc. (3D Systems Corporation)
• Inventors: Parker, Brent, Spence, Stuart T., Modrek, Borzo
• Primary Examiner(s): Tentoni, Leo B.
• Application Number:
  US07/679,416
• Time in Patent Office: 595 Days
• Field of Search: 264/22, 264/232, 264/234, 264/236, 264/308, 264/340, 264/344, 264/345, 264/347, 425/174, 425/174.4, 425/404, 425/445, 156/273.5, 156/275.5, 156/307.1, 156/379.6, 427/43.1, 427/44, 427/53.1, 427/54.1, 427/393.5, 118/423, 118/429, 118/620, 250/432 R, 250/492.1, 430/327, 430/328, 430/331, 430/394, 430/396, 522/910
• US Class Current: 264/401
• CPC Class Codes: B29C 64/135 the energy source being concentrated, e.g. scanning lasers or focused light sources
• CPC Class Codes: B29K 2995/0073 smooth
• CPC Class Codes: B33Y 40/20 Post-treatment, e.g. curing, coating or polishing
• CPC Class Codes: G05B 2219/49013 Deposit layers, cured by scanning laser, stereo lithography SLA, prototyping

Abstract

An improved stereolithography system and method for curing a stereolithography-produced part, including at least some material that is no more than partially transformed, by exposing the part to off-peak absorptive wavelengths of synergistic stimulation to achieve a more uniform cure.

Claims

1. An apparatus for curing a stereolithographically-produced part produced form a material capable of selective physical transformation upon exposure to synergistic stimulation within a reactive range of wavelengths, the range including peak-absorptive wavelengths absorbed most strongly by the material, and off-peak-absorptive wavelengths absorbed substantially less strongly by the material, and the part comprising at least some of said material which is no more than partially transformed, comprising:

means for providing synergistic stimulation to said part including as a component synergistic stimulation at at least one of said off-peak-absorptive wavelengths, wherein said component has a corresponding energy, and wherein said corresponding energy of said component is such that any further transformation of said no more than partially transformed material upon exposure to said synergistic stimulation provided to said part will primarily occur in response to said component; and

means for exposing said part to said provided synergistic stimulation whereupon at least some of said no more than partially transformed material substantially transforms.

2. The apparatus of claim 43 further comprising means for generally surrounding said part with a substance which conducts heat away from said part while said part is exposed to said synergistic stimulation provided to said part.

3. The apparatus of claim 45 wherein said providing means comprises a source of synergistic stimulation, the synergistic stimulation from said source including as a component synergistic stimulation at at least one of said peak-absorptive wavelengths, said means for generally surrounding said part with said substance, and means for directing said synergistic stimulation from said source to follow an optical path from said source through said substance and to said part, said substance including an absorber which at least partially absorbs said peak-absorptive component out of said synergistic stimulation from said source to form said synergistic stimulation provided to said part.

4. A method for curing a stereolithographically-produced part formed from a material capable of selective physical transformation upon exposure to synergistic stimulation within a reactive range of wavelengths, the range including peak-absorptive wavelengths absorbed most strongly by the material, and off-peak-absorptive wavelengths absorbed substantially less strongly by the material, and the part comprising at least some of said material which is no more than partially transformed, comprising the steps of:

providing synergistic stimulation including as a component synergistic stimulation at at least one of said off-peak absorptive wavelengths, wherein said component has a corresponding energy, and wherein said corresponding energy of said component is such that any further transformation of said at most partially transformed material upon exposure to said synergistic stimulation will primarily occur in response to said component; and

exposing said part to said provided synergistic stimulation whereupon at least some of said no more than partially transformed material substantially transforms.

5. The method of claim 4 further comprising the step of generally surrounding said part with a substance which conducts heat away from said part before performing said exposing step.

6. The method of claim 5 further comprising directing synergistic stimulation from a source, the synergistic stimulation from said source including as a component synergistic stimulation at at least one of said peak-absorptive wavelengths, to follow an optical path from said source through said substance to said part, and filtering, at least in part, said component out of said synergistic stimulation from said source, by adding an absorber to said substance which at least partially absorbs said component, to form said synergistic stimulation provided to said part.

7. An apparatus for curing a stereolithographically-produced part formed from a material capable of selective physical transformation upon exposure to synergistic stimulation within a reactive range of wavelengths, the range including peak-absorptive wavelengths absorbed most strongly by the material, and off-peak-absorptive wavelengths absorbed substantially less strongly by the material, and the part comprising at least some of said material which is no more than partially transformed, comprising:

means for providing synergistic stimulation including as a component synergistic stimulation at at least one of said off-peak-absorptive wavelengths, wherein the component has a corresponding energy, and wherein said corresponding energy of said component is substantially greater than any energy of any component of said synergistic stimulation which is at said peak-absorptive wavelengths; and

means for exposing said part to said provided synergistic stimulation whereupon at least some of said at most partially transformed material substantially transforms.

8. A method for curing a stereolithographically-produced part formed from a material capable of selective physical transformation upon exposure to synergistic stimulation within a reactive range of wavelengths, the range including peak-absorptive wavelengths absorbed most strongly by the material, and off-peak-absorptive wavelengths absorbed substantially less strongly by the material, and the part comprising at least some of said material which is no more than partially transformed, comprising:

providing synergistic stimulation including as a component synergistic stimulation at at least one of said off-peak-absorptive wavelengths, wherein said component has a corresponding energy, and wherein said corresponding energy of said component is substantially greater than any energy of any component of said synergistic stimulation which is at said peak-absorptive wavelength; and

exposing said part to said provided synergistic stimulation whereupon at least some of said at most partially transformed material substantially transforms.

9. An apparatus for curing a stereolithographically-produced part formed from a material capable of selective physical transformation upon exposure to synergistic stimulation within a range of wavelengths, the range including peak-absorptive wavelengths absorbed most strongly by the material, and off-peak-absorptive wavelengths absorbed substantially less strongly by the material, and the part comprising at least some of said material which is no more than partially transformed, comprising:

means for directing synergistic stimulation, originating from a source and including at least one off-peak absorptive wavelength and further including, as a component, synergistic stimulation at at least one of said peak-absorptive wavelengths, along an optical path from said source to said part; and

filtering means situated along said optical path for substantially filtering said component out of said synergistic stimulation from said source to form synergistic stimulation which exposes said part, whereupon at least some of said no more than partially transformed material substantially transforms.

10. A method for curing a stereolithographically-produced part from a material capable of selective physical transformation upon exposure to synergistic stimulation within a reactive range of wavelengths, the range including peak-absorptive wavelengths absorbed most strongly by the material and off-peak absorptive wavelengths absorbed substantially less strongly by the material, and the part comprising at least some of said material which is no more than partially transformed, comprising:

directing synergistic stimulation, originating from a source and including at least one off-peak absorptive wavelength and further including, as a component, synergistic stimulation at at least one of said peak-absorptive wavelengths, along an optical path from said source to said part; and

substantially filtering said component out of said synergistic stimulation to form synergistic stimulation which exposes said part, whereupon at least some of said no more than partially transformed material substantially transforms.

11. An apparatus for forming a three-dimensional object from a material capable of selective physical transformation upon exposure to synergistic stimulation within a reactive range of wavelengths, the range including peak-absorptive wavelengths absorbed most strongly by the material, and off-peak-absorptive wavelengths absorbed substantially less strongly by the material, comprising:

means for selectively exposing said material to synergistic stimulation to form a preliminary object comprising at least some of said material which is no more than partially transformed;

means for providing synergistic stimulation including as a component synergistic stimulation at at least one of said off-peak-absorptive wavelengths, wherein said component has a corresponding energy, and wherein said corresponding energy of said component is such that any further transformation of said no more than partially transformed material upon exposure to said provided synergistic stimulation will primarily occur in response to said component; and

means for exposing said preliminary object to said provided synergistic stimulation whereupon at least some of said at most partially transformed material transforms.

12. A method for forming a three-dimensional object from a material capable of selective physical transformation upon exposure to synergistic stimulation within a reactive range of wavelengths, the range including peak-absorptive wavelengths absorbed most strongly by the material, and off-peak-absorptive wavelengths absorbed substantially less strongly by the material, comprising the steps of:

selectively exposing said material to synergistic stimulation to form a preliminary object comprising at least some of said material which is no more than partially transformed;

providing synergistic stimulation including as a component synergistic stimulation at at least one of said off-peak-absorptive wavelengths, wherein said component has a corresponding energy, and wherein said corresponding energy of said component is such that any further transformation of said no more than partially transformed material upon exposure to said provided synergistic stimulation will primarily occur in response to said component; and

exposing said preliminary object to said provided synergistic stimulation whereupon said at most partially transformed material transforms.