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Balanced airflow distribution in a blow tube array

IP.com Disclosure Number: IPCOM000008070D
Publication Date: 2002-May-15
Document File: 3 page(s) / 169K

Publishing Venue

The IP.com Prior Art Database

Abstract

This invention broadly relates to balancing the airflow distribution in an array of blow tubes or nozzles that are connected to a common plenum. In particular, this invention relates to balancing the airflow distribution in an array of blow tubes or nozzles that are connected to a common plenum for the purpose of cooling injection molded articles such as preforms; preforms are used to produce blow-molded bottles. By bringing the velocity of the air to near zero as it enters the tubes through the porous element, the air distribution from tube-to-tube would be balanced because of the uniform static pressure distribution in an adequately designed plenum. The static pressure of the air at each porous element would evenly drive the air into each tube. An advantage of improved in-situ cooling may be found in faster cycle times.

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Field of the Invention

       This invention broadly relates to balancing the
airflow distribution in an array of blow tubes or nozzles that
are connected to a common plenum. In particular, this invention
relates to balancing the airflow distribution in an array of
blow tubes or nozzles that are connected to a common plenum for
the purpose of cooling injection molded articles such as
preforms; preforms are used to produce blow-molded bottles.

Summary of the Prior Art

       Known prior art air blow plenums suffer from having an
airflow distribution from tube-to-tube that is not uniform.
This may result in temperature variations amongst the preforms
at ejection from the cores. Further, air velocity in the plenum
may not be uniform, the variations in velocity at each tube
inlet is the cause for the variation in the airflow
distribution. Expensive baffling inside the plenum have been
designed to balance out the air velocity distribution within the
plenum. The jet stream from the blow tubes disperse quickly
after exiting from tube that is mounted in plenum. This results
in non-uniformly cooled preform. It is hard to cool the body of
the preform as effectively as the dome because the air stream
separates early from the preform surface.

Summary of the Invention

       The primary objective of the invention is to balance
the airflow distribution in an array of blow tubes or nozzles
that are connected to a common plenum for the purpose of cooling
injection molded articles such as preforms.

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Page 2 of 3

       As supported by the Bernoulli equation, the cause of
the non-uniform air distributi...