| abstract |
PROBLEM TO BE SOLVED: To solve the above-mentioned problems in the production of a conventional polyester, and crystallize, dry or polycondensate an amorphous polyester chip obtained by melt polycondensation in a solid phase. In this case, after the chip surface is pre-crystallized and then crystallized by an infrared radiation device, the chips are attached to each other by crystallization, drying or solid phase polymerization, and the chip is attached to the crystallizer or drying device. A method for producing high-quality polyester at low cost by efficiently crystallizing, drying or solid-phase polymerizing chips while preventing adhesion, and a method for producing polyester for efficiently drying and removing water from moisture-absorbed polyester The purpose is to provide. A method for producing a polyester, characterized in that a melt polycondensed polyester is pre-crystallized by heat treatment and then crystallized by an infrared radiation device. [Selection figure] None |