Patent ID: 8246875

Claim:
A process for producing thermoplastic resin pellets, comprising: pressurizing the interior of a vessel holding molten thermoplastic resin, thereby discharging an amount of the molten resin; forming pellets through solidification and cutting of the discharged resin; and transferring the pellets to a storage container via a pipe by a pneumatic transportation or a suction transportation; wherein the transfer pipe has an inlet, an outlet and at least one pressure sensor to measure a pressure difference between the inlet and outlet in the transfer pipe, measuring the pressure difference between the inlet and outlet of the transfer pipe, and an amount of the resin discharged to the transfer pipe in the form of pellets is regulated by controlling the pressure in the interior of the vessel holding the molten thermoplastic resin so that variation in the difference in pressure between the inlet and the outlet of the transfer pipe is 10% or less.