POLYESTER CONTAINERS

摘要

A polyester container, such as a polyethylene terephthalate container produced by blowmolding can be given a modified exterior surface, such as a frosted appearance, by being blowmolded in a mold that has an irregular, pitted surface, the mold being at a temperature of at least about 40 °C above the glass transition temperature of the polyester resin. At this temperature of the mold the polyester resin will flow into the irregularities of the mold and produce a frosted appearance to the exterior surface of the container. One technique to give the mold an irregular, pitted surface is to grit-blast the interior of the mold that is to have the frosted appearance. Other modifications other than a frosted appearance can be imparted to the surface of a container. These include recesses, projections and serrations.