Dtl Technology Limited Partnership

Dtl Monofoot Limited Partnership

Hoover Universal, Inc.

John H Muszynski

Martin H Beck

George F Rollend

Robert J Caldicott

Dennis C Connor

Lydia K Reed

Scott J Hickey

A multi-cavity coinjection mold and method for simultaneously producing a plurality of multi-layered articles comprising: a mold structure defining a plurality of mold cavities; a first supply source for supplying metered amounts of a first molding material; a second supply source for supplying metered amounts of a second molding material; a hot runner system in communication with the first and second supply sources for conveying the metered amounts of the first and the second materials separately to a region proximate each of the cavities; the region comprising having a pin controlled passage leading to proximate cavity by way of a gate having the same cross-section as the passage, the pin scavenging material from the passage and providing cavity packing.

Molding multi-layered articles using coinjection techniques

The invention provides a light weight self-standing blow molded two liter carbonated beverage bottle having a unique petaloid base made from a monobase preform. The base comprises a petaloid design which has a plurality of at least three (preferably five) feet. The monobase preform has a thick reinforcing ring forming portion which remains unstretched during blowing. The reinforcing ring forming portion is thicker than both the sidewall forming portion and the gate area forming portion of the preform thereby resulting in increased stretching in both those areas. The reinforcing ring extends circumferentially around the base. By providing such a reinforcing ring, a bottle having a bigger foot radius and/or containing less material use can be realized. The resulting bottle has less stress whitening and greater stress crack resistance while at the same time using less material and/or having a larger radius than prior bottles.

One piece self-standing blow molded plastic containers made from a

The invention provides a light weight self-standing blow molded two liter carbonated beverage bottle having a unique petaloid base made from a monobase preform. The base comprises a petaloid design which has a plurality of at least three (preferably five) feet. The monobase preform has a thick reinforcing ring forming portion which remains relatively unstretched during blowing. The reinforcing ring forming portion is thicker than both the strap forming portion, sloping outer wall forming portion and the gate area forming portion of the preform thereby resulting in increased wall thickness reduction, stretching and orientation in those areas during blowing. The reinforcing ring extends circumferentially around the base. By providing such a reinforcing ring, a bottle having a bigger foot radius and/or containing less material usage than prior art containers can be realized. The resulting bottle has less stress whitening and greater stress crack resistance while at the same time using less material and/or having a larger radius than prior bottles.

A process for injection molding a multi-colored article in an injection mold, in which a) a desired initial quantity of a first-colored material is metered to a first desired portion of the cavity; b) a desired quantity of a second-colored material is supplied to the cavity, contiguously with the first-colored material, and is metered to a second desired portion of the cavity. The location of the first and second desired portions within in the cavity being controlled by providing the first and second-colored materials with appropriate melt viscosities and controlling the temperature and rate of supply of the first and second-colored materials. A multi-colored preform formed by the process that is suitable for blow molding a multi-colored container, and a multi-colored container blow molded from such a preform are also provided.

Coinjection molding of decorative preforms and containers produced from

The invention provides a self-standing blow molded two liter carbonated beverage bottle 1 weighing under 50 grams and having a unique petaloid base 7. The base comprises a petaloid design which has a plurality of at least three (preferably five) feet 9. Between each adjacent pair of feet is a radially extending valley 12 the width of which decreases with increasing radial distance from the bottles longitudinal axis toward a point of convergence 14 radially outside the bottle's diameter. The valley floor generally follows the hemispherical base shape and opens to an extended portion 13 of that base shape lying radially outwardly of the feet. The valley and extended portion initial pressurization of the bottle, deformation of the extended portions outwardly with a resulting raising of the center of the base away from the support surface.

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Auburn, NH, United States of America

John H Muszynski