The Dow Chemical Company

Dow Brands Inc.

William A Kirksey

Brian C Dais

Jose Porchia

William E LeBoeuf

Michael J Banco

John O McCree

Douglas P Gundlach

Peter T Keillor, Iii

Kevin J Wagers

James K Rieke

Larry R Erickson

Marvin J Kreh

Richard L Scott

Filtration process and filters for use with materials such as, but not limited to, melts, utilizing a band of filter medium sealed in the filter rollers to seal the material from the outside. In one embodiment, the seal rollers reduce to a minimum the leakage of melt to the outside and make it possible to advance the filter medium through the filter continuously. In various embodiments, the filter medium can be advanced either by the takeup spool or by driving the seal rollers and the rate of movement of the filter medium through the filter can be controlled to maintain a constant pressure drop across the filter. Two component wear-resistant seals are also provided. Maintaining constant conditions through continuous advancement of the filter medium during filtration yields higher product quality and dimensional stability.

Continuous filter

A zipper closure for a reclosable thermoplastic bag includes two opposing interlockable rib and groove profiles, wherein at least a part of one or both of the profiles is divided into segments of materials having different elastic moduli. The zipper provides an audibly and/or tactilely perceptible indication of proper interlocking of the profiles.

Zipper for reclosable thermoplastic bag

Method and apparatus for manufacturing a composite film of a matrix material and of a second material in the form of one or more strips of the second material which are embedded in the matrix material at one or both surfaces of the composite film.

Method and apparatus for making extruded plastic film with strips

A tensile testing apparatus comprises a magazine or holder for test specimens. The specimens are disposed horizontally with their end portions constrained by U-shaped channels. Slots at the lower ends of the channels are provided for pulling the lowermost test specimen therethrough under the action of robot fingers, the fingers pulling the specimen to a 90 degree slide whereupon the fingers are lowered and the test specimen slides down the slide and is rotated 90 degrees before coming to rest on seats at the ends of the slides. The now retracted robot fingers are turned 90 degrees and spread apart for movement toward the test specimen which is then gripped and lifted upwardly from the seats and then transferred to a testing machine, tested and then removed from the testing machine.

Tensile test apparatus embodying novel specimen bar magazine

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Midland, MI, United States of America

William A Kirksey