Method for reducing cavitation in impulse ink jet printing device

A method for preventing the formation of gas bubbles inside of a piezo-type impulse fluid device, said piezo-type impulse fluid device having at least one fluid chamber with at least one orifice therein and a piezoelectric transducer coupled to said chamber, the method comprising the steps of:

• supplying a jetting fluid to the fluid chamber, wherein said jetting fluid comprises an antioxidant at a concentration of from about 0.01 to about 5.0 percent by weight;
• changing the rate of energization of said piezoelectric transducer such that said piezoelectric transducer expands and contracts the fluid chamber and;
• ejecting a droplet of fluid from the at least one orifice, wherein the jetting fluid is a dispersion ink jet ink composition comprising:
• from about 20 to about 50 percent by weight of a pigment dispersion, wherein said pigment dispersion comprises from about 25 to about 45 percent by weight of a pigment;
• from about 15 to about 45 percent by weight of a polymeric dispersant;
• and from about 25 to about 45 percent by weight of a dispersion medium, wherein the ratio of pigment to polymeric dispersant is from about 1:1 to about 1:0.7;
• from about 10 to about 20 percent by weight of a glycol ether;
• and
• from about 40 to about 60 percent by weight of a plasticizer.

A method for preventing the formation of gas bubbles inside of a piezo-type impulse fluid device, said piezo-type impulse fluid device having at least one fluid chamber with at least one orifice therein and a piezoelectric transducer coupled to said chamber, the method comprising the steps of:

• supplying a jetting fluid to the fluid chamber, wherein said jetting fluid comprises an antioxidant at a concentration of from about 0.01 to about 5.0 percent by weight;
• changing the rate of energization of said piezoelectric transducer such that said piezoelectric transducer expands and contracts the fluid chamber;
• and
• ejecting a droplet of fluid from the at least one orifice, wherein the jetting fluid is a fast-drying ink jet ink composition comprising:
• a) from about 20 to about 95 percent by weight of a solvent comprising a glycol alkyl ether having about 3 to 20 carbon atoms, a ketone alcohol, 1,4-butanediol, denatured ethanol, benzyl alcohol, alkyl lactates, or mixtures thereof;
• b) from about 1 to about 20 percent by weight of a polymeric resin comprising polyester resins, polyvinylbuterol resins, phenolic resins, acrylic resins, or mixtures thereof;
• and
• c) from about 1 to about 20 percent by weight of a colorant, wherein formation of gas bubbles is substantially prevented inside said piezoelectric impulse fluid device.

A jetting fluid for a piezoelectric impulse fluid device, said piezoelectric impulse fluid device having a fluid chamber with at least one orifice therein and a piezoelectric transducer coupled to said chamber, the jetting fluid comprising:

• (a) from about 20 to about 50 percent by weight of a pigment dispersion, wherein said pigment dispersion comprises from about 25 to about 45 percent by weight of a pigment;
• from about 15 to about 45 percent by weight of a polymeric dispersant;
• and from about 25 to about 45 percent by weight of a dispersion medium, wherein the ratio of pigment to polymeric dispersant is from about 1:1 to about 1:0.7;
• (b) from about 10 to about 20 percent by weight of a glycol ether;
• (c) from about 40 to about 60 percent by weight of a plasticizer;
• and
• (d) from about 0.01 to about 5.0 percent by weight of an antioxidant.

A jetting fluid for a piezoelectric impulse fluid device, said piezoelectric impulse fluid device having a fluid chamber with at least one orifice therein and a piezoelectric transducer coupled to said chamber, comprising:

• a) from about 20 to about 95 percent by weight of a solvent comprising a glycol alkyl ether having about 3 to 20 carbon atoms, a ketone alcohol, 1,4-butanediol, denatured ethanol, benzyl alcohol, alkyl lactates, or mixtures thereof;
• (b) from about 1 to about 20 percent by weight of a polymeric resin comprising polyester resins, polyvinylbuterol resins, phenolic resins, acrylic resins, or mixtures thereof;
• (c) from about 1 to about 20 percent by weight of a colorant;
• and
• (d) from about 0.01 to about 5.0 percent by weight of an antioxidant,
• wherein formation of gas bubbles is substantially prevented inside said piezoelectric impulse fluid device.