초록 ▼

This invention relates to a process and apparatus for forming a polyester polymer into particles. More particularly, this invention relates to a process and apparatus for forming crystalline, uniform pellets from an amorphous polyester melt. The polyester pellets have utility, for example, as feedst

This invention relates to a process and apparatus for forming a polyester polymer into particles. More particularly, this invention relates to a process and apparatus for forming crystalline, uniform pellets from an amorphous polyester melt. The polyester pellets have utility, for example, as feedstock for a process for producing higher molecular weight polyesters.

대표청구항 ▼

An apparatus for producing pellets of a polymer from its polymer melt, comprising: (a) a pellet former comprising a rotatable container having a plurality of outlets, defining openings each having a maximum cross-sectional dimension in the range of about 0.5 mm to about 5 mm, for metering a polymer

An apparatus for producing pellets of a polymer from its polymer melt, comprising: (a) a pellet former comprising a rotatable container having a plurality of outlets, defining openings each having a maximum cross-sectional dimension in the range of about 0.5 mm to about 5 mm, for metering a polymer melt onto the surface of a conveyor; (b) a conveyor comprising for receiving, from the pellet former, the polymer melt in the form of a plurality of droplets or crystallizing pellets, which conveyor comprises a surface which is adapted for movement relative to the pellet former and for conveying the pellets through a crystallization section; and (c) a crystallization section extending from the point at which the pellets are received onto the surface of the conveyor and along a portion of the conveyor, the crystallization section further comprising a means for adding or removing heat for controlling the temperature of the surface above 50°C. within a predetermined temperature range as the surface passes through the crystallization section.