| CPC B29C 64/106 (2017.08) [B29C 64/118 (2017.08); B29K 2021/003 (2013.01); B33Y 10/00 (2014.12); B33Y 70/00 (2014.12)] | 9 Claims |
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1. A manufacturing method of a molded object by three-dimensional printing, comprising:
forming a plurality of single-layer structures including at least a first single-layer structure and a second single-layer structure, by performing a plurality of running steps including at least a first running step and a second running step;
the first running step comprising forming the first single-layer structure by running a strand formed by extruding, from a nozzle, granular material melted in an extruder with a screw, and
the second running step comprising forming the second single-layer structure on the first single-layer structure by running the strand formed by extruding, from the nozzle, the granular material melted in the extruder with the screw to form a laminated structure, wherein
the granular material is formed of a thermoplastic elastomer,
the thermoplastic elastomer has, at at least one of a measurement temperature of 120 to 270° C., a loss tangent (tan δ) of 0.40 or more and a loss modulus (G″) of 11000 Pa or less, which are measured with a rotary rheometer having a setting strain of 0.01 at a frequency of 1 Hz,
the strand consists of the thermoplastic elastomer,
the first and second running steps are performed at a molding temperature at which the loss modulus (G″) is 582 to 4500 Pa and the loss tangent (tan δ) is 0.40 or more, wherein the molding temperature is a temperature of the strand immediately after being extruded from the nozzle; and
the thermoplastic elastomer has a Shore A hardness of 0 to 10.
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