Three-dimensional shaped article manufacturing method
A three-dimensional shaped article manufacturing method with which a three-dimensional shaped article having a matte-toned texture can be manufactured stably and efficiently is provided. A three-dimensional shaped article manufacturing method of the present invention is a method for manufacturing a three-dimensional shaped article by laminating layers formed by discharging and curing inks including a curable resin, the method including applying a substantive section-forming ink to a region that forms the three-dimensional shaped article, and applying a sacrificial layer-forming ink for forming a sacrificial layer to a region that is adjacent to a region that forms an outermost layer of the three-dimensional shaped article and on a surface side of the outermost layer, a viscoelasticity of the sacrificial layer-forming ink during curing of the substantive section-forming ink being less than a viscoelasticity of the substantive section-forming ink during curing of the substantive section-forming ink.
1. A three-dimensional shaped article manufacturing method for manufacturing a three-dimensional shaped article by laminating layers formed by discharging and curing inks including a curable resin, the method comprising:
applying a substantive section-forming ink to a region that forms the three-dimensional shaped article;
applying a sacrificial layer-forming ink for forming a sacrificial layer to a region that is adjacent to a region that forms an outermost layer of the three-dimensional shaped article and on a surface side of the outermost layer, with the substantive section-forming ink and the sacrificial layer-forming ink both including a curing component; and
curing both the substantive section-forming ink and the sacrificial layer-forming ink,
a viscoelasticity of the sacrificial layer-forming ink during curing of the substantive section-forming ink being less than a viscoelasticity of the substantive section-forming ink during curing of the substantive section-forming ink.
2. The three-dimensional shaped article manufacturing method as set forth in claim 1 , further comprising
removing the sacrificial layer from a provisional molded article obtained by curing the substantive section-forming ink and the sacrificial layer-forming ink.
3. The three-dimensional shaped article manufacturing method as set forth in claim 1 , wherein
the sacrificial layer-forming ink includes one or more species selected from the group consisting of tetrahydrofurfuryl (meth)acrylate, ethoxyethoxy ethyl (meth)acrylate, polyethylene glycol di(meth)acrylate, and (meth)acryloylmorpholine.
4. The three-dimensional shaped article manufacturing method as set forth in claim 1 , wherein
the substantive section-forming ink includes one or more species selected from the group consisting of 2-(2-vinyloxyethoxy) ethyl (meth) acrylate, polyether-based aliphatic urethane (meth)acrylate oligomer, 2-hydroxy-3-phenoxypropyl(meth)acrylate, and 4-hydroxybutyl(meth)acrylate.
5. The three-dimensional shaped article manufacturing method as set forth in claim 1 , wherein
the substantive section-forming ink and the sacrificial layer-forming ink both include a polymerization initiator,
a content ratio of the polymerization initiator in the substantive section-forming ink being higher than a content ratio of the polymerization initiator in the sacrificial layer-forming ink.
6. The three-dimensional shaped article manufacturing method as set forth in claim 1 , wherein
the substantive section-forming ink and the sacrificial layer-forming ink both include bis(2,4,6-trimethylbenzoyl)-phenyl phosphineoxide and/or 2,4,6-trimethylbenzoyl-diphenyl-phosphineoxide as a polymerization initiator.
7. The three-dimensional shaped article manufacturing method as set forth in claim 1 , wherein
a color ink containing a coloring agent and, in addition thereto, a colorless ink not containing a coloring agent are used as the substantive section-forming ink,
the colorless ink being used upon formation of the region that forms the outermost layer, and the color ink being used upon formation of a region that is inside therefrom.
8. The three-dimensional shaped article manufacturing method as set forth in claim 1 , wherein
a chromatic color ink and a white ink are used as a color ink containing a coloring agent,
the white ink being used upon formation of a region inside of a region formed using the chromatic color ink.
9. The three-dimensional shaped article manufacturing method as set forth in claim 1 , wherein
a plurality of different types of the sacrificial layer-forming ink are used.
10. The three-dimensional shaped article manufacturing method as set forth in claim 1 , wherein
the sacrificial layer-forming ink is selectively applied to a part of the region that is adjacent to the region that forms the outermost layer of the three-dimensional shaped article and on the surface side of the outermost layer.
11. The three-dimensional shaped article manufacturing method as set forth in claim 1 , wherein
the curing of both the substantive section-forming ink and the sacrificial layer-forming ink forms wrinkling at an interface defined between the the substantive section-forming ink and the sacrificial layer-forming ink.