Plastic Technologies, Inc.

David A Bogstad

Donald W Hayward

Donald Wayne Miller

Daniel L Witham

A system for measuring gas permeation through container walls is disclosed, wherein a pressure fluid is introduced into a container to be tested. Once the pressure fluid is introduced into the container, the pressure fluid is drawn out of the container and tested to determine the permeation characteristics of the container.

System for gas permeation testing

A method and an apparatus for monitoring the production of blow molded plastic containers () includes a columnator () and sound detector () responsive to a defect sound of pressure fluid escaping from a container being formed in a mold cavity (). The columnator is effective to filter the defect sound from ambient noise. An output signal generated by the sound detector is processed to generate a control signal used to reject a defective container. Preferably, the open end of the columnator is positioned between 20&#xb0; and 150&#xb0; from the preform loading station in a rotary platform () blow molding machine.

Method and apparatus for detecting holes in plastic containers

The invention relates to a method and apparatus for monitoring the production of blow molded plastic containers. It has been discovered that by sonically monitoring the production of a plastic blow molded container, the occurrence of a hole in the wall of the container being formed by a blow molding operation will produce a detectable noise signal. The noise signal is caused by the flow of pressure fluid through the hole. The flow of pressure fluid is caused by the pressure differentiating between the inside and the outside of the container being produced. The noise signal is of an amplitude and frequency readily recognizable from the ambient background noise.

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Perrysburg, OH, United States of America

David A Bogstad