Straightening of warped products assisted by near-infrared radiation

Author

Sato, Kimitoshi ; Hayashi, Kaichi ; Saito, Takushi ; Kurosaki, Yasuo

Author_Institution

Univ. of Electro-Commun., Chofu, Japan

fYear

2001

fDate

2001

Firstpage

347

Lastpage

352

Abstract

A reform method of the warped products by utilizing press molding assisted by a near-infrared radiative heating right after an injection molding process is proposed and its feasibility investigated in this paper. Since the temperature of irradiated component rises due to absorption of radiation, the plasticity of polymer consequently increases, and then the flat component is produced in the proposed process. First the effect of heating by near-infrared radiation on the reduction of warpage of an LCP product has been studied experimentally. Then the temperature distribution within the product and molds was obtained by numerical calculation in order to estimate the validity of the proposing method. It was considered that the influence of the thermal conductivity of the mold system and convective heat transfer are dominant for the processing cycle time

Keywords

convection; moulding; plasticity; process heating; temperature distribution; thermal conductivity; convective heat transfer; flat component; injection molding process; near-infrared radiation; plasticity; polymer; press molding; processing cycle time; temperature distribution; thermal conductivity; warped products; Glass; Heat transfer; Heat treatment; Infrared heating; Injection molding; Liquid crystal polymers; Residual stresses; Temperature distribution; Thermal conductivity; Thermal resistance;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronic Materials and Packaging, 2001. EMAP 2001. Advances in

Conference_Location

Jeju Island

Print_ISBN

0-7803-7157-7

Type

conf

DOI

10.1109/EMAP.2001.984008

Filename

984008