CPC C09D 11/38 (2013.01) [B29C 64/112 (2017.08); B29C 64/124 (2017.08); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12); C09D 11/037 (2013.01); C09D 11/101 (2013.01); C09D 11/107 (2013.01); C09D 11/328 (2013.01); B29K 2033/12 (2013.01); B29K 2105/0032 (2013.01)] | 18 Claims |
1. A method of forming a three-dimensional article by additive manufacturing, the method comprising:
providing an ink; and
selectively curing a portion of the ink using incident curing radiation having a Gaussian distribution of wavelengths and a peak wavelength at a wavelength λ,
wherein the ink comprises
up to 80 wt. % oligomeric curable material, based on the total weight of the ink;
up to 80 wt. % monomeric curable material, based on the total weight of the ink;
up to 10 wt. % photoinitiator, based on the total weight of the ink;
up to 1 wt. % non-curable absorber material, based on the total weight of the ink; and
up to 10 wt. % one or more additional components, based on the total weight of the ink,
wherein the total amount of the oligomeric curable material, monomeric curable material, photoinitiator, non-curable absorber material, and one or more additional components is equal to 100 wt. %;
wherein the photoinitiator is operable to initiate curing of the oligomeric curable material and/or the monomeric curable material when the photoinitiator is exposed to the incident curing radiation;
wherein the ink has a penetration depth (Dp) and a critical energy (Ec) at the wavelength λ, and the ratio of Dp to Ec, in units of (μm cm2)/mJ, is between 10 and 50; and
wherein the ink has a print through depth (DPT) at the wavelength λ of less than or equal to 2×Dp.
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