Priming a print substrate

Patent metadata

Field	Value
Publication number	US-2018314191-A1
Application number	US-201515770139-A
Country	US
Kind code	A1
Filing date	Dec 11, 2015
Priority date	Dec 11, 2015
Publication date	Nov 1, 2018
Grant date	—

Abstract

Described herein is a method for priming a print substrate for subsequently receiving a liquid electrophotographic (LEP) inkin which a surface of a print substrate is coated with a first primer using an analogue printing technique and a second primer is digitally printed to the surface of the print substrate coated with the first primer.

First claim

1 . A method for priming a print substrate for subsequently receiving a liquid electrophotographic (LEP) ink, the method comprising:
coating a surface of a print substrate with a first primer using an analogue printing technique; and digitally printing a second primer to the surface of the print substrate coated with the first primer.

2 . A method according to claim 1 , wherein the second primer comprises a second primer resin and a solid polar compound, wherein the solid polar compound is selected from the group consisting of a cellulose microcrystalline powder, dextrin, maltose monohydrate, polyacrylic acid, polyvinyl alcohol, a styrene maleic anhydride copolymer, a bismaleimide oligomer, sucrose, sucrose octaacetate, sucrose benzoate, and combinations thereof.

3 . A method according to claim 2 , wherein the second primer comprises a non-polar liquid carrier.

4 . A method according to claim 2 , wherein the second primer comprises a charge adjuvant.

5 . A method according to claim 2 , wherein the second primer comprises a charge director.

6 . A method according to claim 1 , wherein the second primer comprises
a paste comprising:
a non-polar carrier liquid; and
a second primer resin swollen in the non-polar carrier liquid, the second primer resin present in the paste in an amount ranging from about 20% (w/w) to about 50% (w/w); and
a solid polar compound dispersed in the resin, the solid polar compound being selected from the group consisting of a cellulose microcrystalline powder, dextrin, maltose monohydrate, polyacrylic acid, polyvinyl alcohol, a styrene maleic anhydride copolymer, a bismaleimide oligomer, sucrose, sucrose octaacetate, sucrose benzoate, and combinations thereof, and the solid polar compound being present in an amount up to 60 wt. % of solids in the paste.

7 . A method according to claim 1 , wherein the first primer comprises a first primer resin dissolved or dispersed in a polar carrier liquid.

8 . A method according to claim 1 , wherein coating a surface of a print substrate with a first primer using an analogue printing technique comprises flood coating the surface of the print substrate with the first primer to coat the entire surface of the print substrate.

9 . A method according to claim 1 , wherein digitally printing a second primer to the surface of the print substrate coated with the first primer comprises selectively applying the second primer to the print substrate.

10 . A method according to claim 9 , wherein selectively applying the second primer to the print substrate comprises applying the second primer to areas of the print substrate to which a LEP ink image is to be subsequently be printed.

11 . A method according to claim 1 , wherein digitally printing a second primer to the surface of the print substrate coated with the first primer comprises liquid electrophotographically printing the second primer to the print substrate.

12 . A printing apparatus comprising:
an analogue printing station for coating a surface of a print substrate with a first primer; and a liquid electrophotographic (LEP) printing station for liquid electrophotographically printing a second primer to the surface of the print substrate coated with the first primer, wherein the LEP printing station comprises: a reservoir containing the second primer; and a photoconductive member having a surface on which a latent electrostatic image can be created, and wherein the printing apparatus is configured to print the second primer to the surface of the print substrate coated with the first primer such that the second primer is disposed on the first primer on the print substrate.

13 . A printing apparatus according to claim 12 , wherein the analogue printing station comprises a gravure printing system, the analogue printing station being in-line with the LEP printing station.

14 . A printing method comprising:
priming a print substrate to receive a LEP ink image; and liquid electrophotographically printing a pigmented liquid electrophotographic (LEP) ink image on to the primed print substrate, wherein priming comprises: coating a surface of the print substrate with a first primer using an analogue printing technique; and digitally printing a second primer to the surface of the print substrate coated with the first primer to provide a primed print substrate, and wherein the pigmented LEP ink image is printed to be disposed on the second primer on the print substrate.

15 . A printing method according to claim 14 , wherein digitally printing a second primer to the surface of the print substrate coated with the first primer comprises liquid electrophotographically printing the second primer to the print substrate.

Assignees

• Hp Indigo Bv

Inventors

• Ron Hannoch
• Hershman Yaron
• Romantcov Gleb
• Nedelin Peter
• Nesher Guy

Classifications

• G03G2215/00801

  Coating device · CPC title

• G03G9/1355

  Ionic, organic compounds · CPC title

• G03G7/0073

  Organic components thereof · CPC title

• G03G9/13

  characterised by polymer components · CPC title

• G03G7/002

  Organic components thereof · CPC title