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Foam Apparatus with Ultrasonic Treatment

IP.com Disclosure Number: IPCOM000077109D
Original Publication Date: 1972-Jun-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 35K

Publishing Venue

IBM

Related People

Ehn, DS: AUTHOR [+2]

Abstract

This is an apparatus for generating polymeric foam. It includes a plurality of inlet tubes 2 for feeding the foam-forming components to mixing chamber 4. The chamber is evacuated by outlet tube 6. Connected to tube 6 is ultrasonic transducer 8. Transducer 8 is coupled to tube 6 through membrane 12 and propagating liquid 14.

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Foam Apparatus with Ultrasonic Treatment

This is an apparatus for generating polymeric foam. It includes a plurality of inlet tubes 2 for feeding the foam-forming components to mixing chamber 4. The chamber is evacuated by outlet tube 6. Connected to tube 6 is ultrasonic transducer 8. Transducer 8 is coupled to tube 6 through membrane 12 and propagating liquid 14.

In operation, the foam-forming components pass through inlet tubes 2 into chamber 4 where they are mixed and then discharged into tube 6. Ultrasonic transducer 8, when activated, treats the incipient foam as it passes through tube
6. The ultrasonic waves generated by transducer 8 are transmitted through propagating liquid 14 to membrane 12 to treat the foam in tube 6. By placing the ultrasonic transducer in a manner to cause its waves to enter tube 6 at an angle, propagation of the ultrasonic waves is sustained within the tube by reflection along the length of the tube. This reflection of the waves provides a more efficient utilization of the ultrasonic energy. The angle of wave entry into tube 6 can be selected to maximize or minimize the amount of ultrasonic treatment. This ultrasonic treatment simultaneously imparts nucleating sites to the foam, reduces the apparent viscosity of the mixture, enhances mixing, and affects the cream time of the foam.

This apparatus is useful for the generation and treatment of both thermosetting and thermoplastic foam.

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