초록 ▼

A method is disclosed for advantageously modifying the texture or character of a plastic work material by applying acoustic energy at the work material's natural resonant frequency via a transducer assembly including vibrating the transducer assembly in air to determine the natural resonant frequenc

A method is disclosed for advantageously modifying the texture or character of a plastic work material by applying acoustic energy at the work material's natural resonant frequency via a transducer assembly including vibrating the transducer assembly in air to determine the natural resonant frequency of the transducer assembly; determining the natural resonant frequency of the work material and the transducer assembly together; subtracting the natural resonant frequency of the transducer assembly from the natural resonant frequency of the work material and the transducer assembly together to determine the natural frequency of the work material; and applying acoustic energy to the work material at the determined natural frequency of the work material. The transducer assembly includes piezoelectric actuators which provide the acoustic energy.

대표청구항 ▼

[ We claim:] [1.] A method of applying controlled vibrations to a work material comprising the steps of:vibrating a transducer assembly in air to determine a natural resonant frequency of said transducer assembly;selecting a work material comprising a liquid and a solid;introducing into said work ma

[ We claim:] [1.] A method of applying controlled vibrations to a work material comprising the steps of:vibrating a transducer assembly in air to determine a natural resonant frequency of said transducer assembly;selecting a work material comprising a liquid and a solid;introducing into said work material a first series of vibrations by said transducer assembly;said first series of vibrations ranging in frequency from a first frequency to a second frequency;determining a natural resonant frequency of a first system, said first system comprising said work material and said transducer assembly;wherein said natural resonant frequency of said first system is between said first frequency and said second frequency;determining a natural resonant frequency of said work material by subtracting said natural resonant frequency of said transducer assembly from said natural resonant frequency of said first system;introducing into said work material a second series of vibrations at said natural resonant frequency of said work material.