Abstract: A process for the continuous production of high molecular weight polyethylene terephthalate wherein the granular polymer having an intrinsic viscosity of at least 0.4 is crystallized, dried and polymerized in the solid phase by polycondensation. Two methods of crystallization are described which aid the process in overcoming problems associated with sticking in the polymerization stage. The method is characterized by polycondensation at a temperature greater than the crystallization temperature.

Abstract: A system for the preparation of no-bake foundry sands for preparation of metal casting molds. A settable binder is introduced into the sand and thoroughly and uniformly mixed therewith and then discharged around a pattern. The resulting mold then sets up and hardens rapidly without baking. After use to produce a metal casting, the mold is broken up and the sand recycled for further use. The present system is characterized by ease of feed rate variation, coordinated feeding of components, short residence time, efficient mixing and reduced clean-up problems. It comprises a horizontal axis paddle-type rotary mixer, coordinated means for feeding the mixture components to the mixer housing and discharge of the mixture upon demand including at least one gas assisted injection port or nozzle for the binder system and control means for regulating the rates of flow. The apparatus is desirably movably supported to facilitate distribution of the discharge.

Abstract: A continuous filter press of the type having wheels provided with conical screens and carried by pivoted side structures, the arrangement being such that material (e.g., a slurry) fed into the space between the wheels is carried through a pinch zone and then discharged. The claimed improvements to such presses include special means for journalling the wheels which employs a sleeve instead of a stud shaft, and material diverting means or plow which has portions on its inner end that are accommodated in central openings of the wheels.