Continental Can Company, Inc.

Richard R Szatkowski

Paul M Erlandson

A method for high speed sinter molding having endless chains mounted side by side. Mold halves are attached at spaced intervals down the chains. The paired mold halves come next to each other to form a female mold into which is deposited a polymeric material. A treating core extends inside the mold and as the mold traverses its path, it surrounds the core and the core deposits polymeric powder, heats the polymeric powder, and then cools it. At the end of the mold path, the finished article is ejected and is ready for the next operation. Another embodiment of the same essential process is to place the paired mold halves in juxtaposition as they moved down over the core. This will result in the fabrication of a continuous conduit. A container may be fabricated by using hollow mold halves with heating and deposition accomplished before the hollow mold halves are pressed together to form a hollow container.

Method for high speed sinter molding

An apparatus and method for making seamless tubular containers having a first end terminating in a shoulder and threaded neck of a reduced diameter with increased wall thickness and a second open end. The process uses a mold having an internal surface configuration corresponding to the external configuration of the desired tubular container. Suction means draws electrostatically charged powder through the mold and permits a portion thereof to deposit on the internal surface, the amount of deposition being partially controlled by the surface configuration. Subsequently, the container is heated to fuse the deposited powder into homogeneous mass, while subsequent cooling permits shrinking of the container away from the mold walls such that it may be removed by hand or by mechanical apparatus.

Apparatus for making tubular containers

Molding is performed by directing streams of comminuted plastic material against surfaces of a heated form or mold, while repeatedly sweeping the form or mold across the streams, progressively depositing the material in one or more predetermined zones, so that the material assimilates progressively along the form or mold surfaces. Apparatus for so molding large receptacles, such as drum liners, includes a series of open molds supported on a turntable for rotation of the molds about their horizontal axes, with the open ends facing radially outward. The table is indexed relative to the various stations, at which successive steps of preheating, deposition, post-heating, cooling and stripping are performed. The deposition apparatus is on a carriage reciprocable radially of the table. A roll unit and several spray units direct streams of the material against the mold surfaces while the mold is rotated and maintained at a temperature suitable for incipient fusion of all the material substantially instantaneously upon impingement, so that the material adheres and fuses where deposited on the mold surfaces. When deposition is complete the mold passes through an arcuate oven overlying a sector of the table, for final sintering. The mold is then quenched, setting the material, whereafter the finished article is stripped from the mold.

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Western Springs, IL, United States of America

Richard R Szatkowski