Developments and Feasibility Assessments of Electric-heating Variotherm Blow Molding Technology
Industrial plastic parts produced by the conventional blow molding technology often exhibit surface defects such as roughness,sunken pits and orange peel texture,which must be eliminated via sanding,painting,and polishing to make the parts meet the standards required for exterior applications.To address this issue,this work developed an electric-heating variotherm blow molding technology by combining the variotherm molding with conventional blow molding process,aiming at directly producing high-gloss and paint-free molded parts.Through theoretical analysis and experimental research,the process designs and system constructions of the variotherm blow molding technique were comprehensively detailed.An industrial plastic part—automotive spoiler was selected as the case to assess the feasibility and effectiveness of this technology in practical productions.The results demonstrate that,by optimizing the process,the developed variotherm blow molding technique could produce automotive spoilers with high surface quality within a cycle time comparable to that of conventional blow molding.The automotive spoiler surface roughness is only 0.15 µm and the surface glossiness reaches 92 GU,achieving a high-gloss mirror effect.Therefore,the need for post-processing procedures typically required to achieve a high-gloss finish in the conventional blow molding could be eliminated completely.This confirms the feasibility and effectiveness of the proposed technique in actual productions,making it suitable for promotions and applications in the industrial-scale manufacturing.
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