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US 2006/0189789 A1Published application
Method for treating recycled polyethylene terephthalate
OwnerDonald Hayward, Daniel Withaminventors
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Abstract
A process for treating RPET flakes comprises providing a quantity of RPET flakes, comminuting the RPET flakes to prepare RPET particles having an average mean particle size less than about 300 microns, and treating the RPET particles utilizing a low energy process selected from the group consisting of simultaneously melting and mixing the RPET particles by means of a low energy melting device to prepare an RPET melt, and thermally treating the RPET particles to dry or crystallize the RPET particles.
Claims8
A process for treating RPET flakes, comprising:
- providing a quantity of RPET flakes;
- comminuting the RPET flakes, to prepare RPET particles having an average mean particle size less than about 300 microns;
- and
- treating the RPET particles utilizing a low energy process selected from the group consisting of simultaneously melting and mixing the RPET particles by means of a low energy melting device to prepare an RPET melt, and thermally treating the RPET particles to dry or crystallize the RPET particles.
1 more element
A process for treating RPET flakes, comprising:
- providing a quantity of RPET flakes, comprising chunks, spheres, pellets, or mixtures thereof, having particle sizes from about ¼ inch to about ½ inch;
- comminuting the RPET flakes, to prepare RPET particles having an average mean particle size less than about 300 microns;
- and
- treating the RPET particles utilizing a low energy process selected from the group consisting of simultaneously melting and mixing the RPET particles by means of a low energy melting device selected from the group consisting of a 2-roll mill, a heated casting roll, and a rotating mandrel, to prepare an RPET melt, and thermally treating the RPET particles by heating the RPET particles to a temperature below the melt temperature of polyethylene terephthalate by passing a gas comprising air, nitrogen, argon, or mixtures thereof over or through the bed of RPET particles, to dry or crystallize the RPET particles.
1 more element
Dependencies are inferred from the claim text.