Method and apparatus having improved image transfer characteristics for producing an image on a receptor medium such as a plain paper

An apparatus for producing a multi-colored image on a receptor media from image data representing a plurality of color planes, comprising:

• a photoreceptor having a surface release layer;
• charge producing means for producing an image-wise distribution of charges on said photoreceptor corresponding to said image representing one of said plurality of color planes;
• a first liquid ink having solid charged pigmented particles, said first liquid ink having an effective glass transition temperature of not less than minus 10 degrees Celsius but at least one degree less than the temperature at which development takes place, said pigmented particles being substantially representative said one of said plurality of color planes;
• first application means for applying said first liquid ink to said photoreceptor forming an image-wise distribution of said pigmented particles on said photoreceptor to form one of said plurality of color planes;
• first film forming means positioned against said photoreceptor immediately following said first application means for drying said image of said liquid ink to film forming within 0.5 seconds so that said first liquid ink has greater than seventy-five percent by volume fraction of solids in said image;
• a second liquid ink having solid charged pigmented particles, said second liquid ink having an effective glass transition temperature of not less than minus 10 degrees Celsius but at least one degree less than the temperature at which development takes place, said pigmented particles being substantially representative another of said plurality of color planes;
• second application means for applying said second liquid ink to said photoreceptor forming an image-wise distribution of said pigmented particles on said photoreceptor to form another of said plurality of color planes;
• a second film forming means positioned against said photoreceptor immediately following said second application means for drying said image of said liquid ink to film forming within 0.5 seconds;
• drying means positioned proximate said photoreceptor following said film forming means for drying said image on said photoreceptor so that said first liquid ink and said second liquid ink have greater than seventy-five percent by volume fraction of solids in said image;
• an elastomeric transfer roller forming a first transfer nip under pressure with said photoreceptor, said transfer roller receiving said plurality of color planes from said photoreceptor, said elastomeric transfer roller being heated to from 50 degrees Celsius to 100 degrees Celsius;
• and
• a backup roller forming a second transfer nip under pressure with said transfer roller, said receptor media passing through said second transfer nip and receiving said plurality of color planes from said transfer roller;
• said release layer of said photoreceptor having a surface energy which is less than a surface energy of said elastomeric transfer roller;
• said surface energy of said elastomeric transfer roller being less than a surface energy of said first liquid ink and said second liquid ink;
• said surface energy of said image formed by said first liquid ink and said second liquid ink being less than a surface energy of said receptor media.

A method of producing an image on a receptor media from image data, comprising the steps of:

• producing an image-wise distribution of charges on a photoreceptor corresponding to said image data;
• liquid ink having solid charged pigmented particles, said liquid ink having an effective glass transition temperature of not less than minus 10 degrees Celsius but at least one degree less than the temperature at which development takes place;
• applying liquid ink having solid charged pigmented particles to said photoreceptor forming an image-wise distribution of said pigmented particles on said photoreceptor to form said image, said liquid ink having an effective glass transition temperature of not less than 10 degrees Celsius but at least one degree less than the temperature at which development takes place;
• fixing said image immediately following said applying step with a film forming means positioned against said photoreceptor for drying said image of said liquid ink to film forming within 0.5 seconds so that said image has greater than seventy-five percent by volume fraction of solids;
• drying said image on said photoreceptor following said film forming means;
• transferring said image from said photoreceptor to an elastomeric transfer roller forming a first transfer nip under pressure with said photoreceptor, said elastomeric transfer roller being heated to from 50 degrees Celsius to 100 degrees Celsius;
• and
• transferring said image from said elastomeric transfer roller to a receptor media in a second transfer nip under pressure from said backup roller, said receptor media passing through said second transfer nip;
• said release layer of said photoreceptor having a surface energy which is less than a surface energy of said elastomeric transfer roller;
• said surface energy of said elastomeric transfer roller being less than a surface energy of said liquid ink;
• said surface energy of said image formed by said liquid ink being less than a surface energy of said receptor media.

A method of producing a multi-colored image on a receptor media from image data representing a plurality of color planes, comprising the steps of:

• producing an image-wise distribution of charges corresponding to said image representing one of said plurality of color planes on a photoreceptor having a surface release layer;
• first applying a first liquid ink having solid charged pigmented particles to said photoreceptor forming an image-wise distribution of said pigmented particles on said photoreceptor to form one of said plurality of color planes, said first liquid ink having an effective glass transition temperature of not less than minus 10 degrees Celsius but at least one degree less than the temperature at which development takes place, said pigmented particles being substantially representative said one of said plurality of color planes;
• fixing said one of said plurality of color planes immediately following said first applying step to dry said image of said liquid ink to film forming within 0.5 seconds with a first film forming means positioned against said photoreceptor so that said one of said plurality of color planes has greater than seventy-five percent by volume fraction of solids;
• second applying a second liquid ink having solid charged pigmented particles to said photoreceptor forming an image-wise distribution of said pigmented particles on said photoreceptor to form another of said plurality of color planes, said second liquid ink having an effective glass transition temperature of not less than minus 10 degrees Celsius but at least one degree less than the temperature at which development takes place, said pigmented particles being substantially representative said another of said plurality of color planes;
• fixing said another of said plurality of color planes immediately following said second applying step to dry said image of said liquid ink to film forming within 0.5 seconds with a second film forming means positioned against said photoreceptor so that said another of said plurality of color planes has greater than seventy-five percent by volume fraction of solids;
• drying said image on said photoreceptor following said second film forming means;
• transferring said image from said photoreceptor to an elastomeric transfer roller forming a first transfer nip under pressure with said photoreceptor, said elastomeric transfer roller being heated to from 50 degrees Celsius to 100 degrees Celsius;
• and
• transferring said image from said elastomeric transfer roller to said receptor media in a second transfer nip under pressure with a backup roller, said receptor media passing through said second transfer nip;
• said release layer of said photoreceptor having a surface energy which is less than a surface energy of said elastomeric transfer roller;
• said surface energy of said elastomeric transfer roller being less than a surface energy of said liquid ink;
• said surface energy of said image formed by said liquid ink being less than a surface energy of said receptor media.