公开(公告)号：JPH03207636A

公开(公告)日：1991-09-10

申请号：JP26295890

申请日：1990-09-29

Applicant: 3 D SYSTEMS INC

Inventor： POORU FURANSHISU JIEIKOBUZU ,  JIYAN RIKUTAA

IPC: B29C67/00 ,  B29C35/08 ,  B29K105/24

Abstract: PURPOSE: To reduce a stress crack generated by a heat by emitting a light having a strong chemical action of a spectral range having a narrow wavelength to a partly cured stereoscopic molding, thereby lowering a postcuring temperature to reduce a warp. CONSTITUTION: In the case of selecting a radiation wavelength for curing a photosensitive polymer resin in an optimum state, it is necessary to obtain a terminating end of an absorption curve of a photopolymerization initiator or to position a terminating end curing radiation of a long wavelength not a point that an absorption becomes zero but its near position. For example, in the case of Irgacure 184, it is a wavelength range near 370 nm, in the case of Irgacure 651, a wavelength range near 390 nm, and in the case of other photopolymerization initiator Lucerin normally used for a stereoscopic molding, a wavelength range near 415 nm. Accordingly, an optimum postcuring radiation source radiates most of its output in a narrow limited spectral range with very small absorption of the initiator. A tubular low pressure mercury vapor fluorescent lamp for emitting an ultraviolet radiation (black light) having a long wavelength is ideal here.