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MATERIAL FOR INK JET CARTRIDGE HAVING NEGATIVE HYDROSTATIC PRESSURE

IP.com Disclosure Number: IPCOM000026849D
Original Publication Date: 1994-Feb-28
Included in the Prior Art Database: 2004-Apr-06
Document File: 2 page(s) / 116K

Publishing Venue

Xerox Disclosure Journal

Abstract

In a thermal ink jet (TIJ) printer, a TIJ cartridge supplies ink that it is holding to the TIJ printhead die. The ink cartridge is partially responsible for applying a negative hydrostatic pressure (typically -0.5 to -2.0 " H20) to the ink over the life of the ink cartridge. Current methods of retaining ink supplied to TIJ printheads use reticulated foam to apply the negative hydrostatic pressure to the ink for the TIJ process to operate. Additionally the reticulated foam handles portability concerns and fluid transients such as leaks. It is, however, also known that manufacturing complexities such as placing foam inside a plastic cartridge exist. Problems arise since the cartridge shape is limited to the capacity that the foam can be cut to fit the cartridge shape. Also sealing the edge of the foam to the cartridge wall is another complexity that results since wrinkles in the skin of the foam at the cartridge wall can cause unwanted air passageways.

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XEROX DISCLOSURE JOURNAL

MATERIAL FOR INK JET CARTRIDGE HAVING NEGATIVE U.S. C1.222/189 HYDROSTATIC PRESSURE
Michael Carlotta

Proposed Classification

Int. C1. B67d 03/00

In a thermal ink jet (TIJ) printer, a TIJ cartridge supplies ink that it is holding to the TIJ printhead die. The ink cartridge is partially responsible for applying a negative hydrostatic pressure (typically -0.5 to -2.0 " H20) to the ink over the life of the ink cartridge. Current methods of retaining ink supplied to TIJ printheads use reticulated foam to apply the negative hydrostatic pressure to the ink for the TIJ process to operate. Additionally the reticulated foam handles portability concerns and fluid transients such as leaks. It is, however, also known that manufacturing complexities such as placing foam inside a plastic cartridge exist. Problems arise since the cartridge shape is limited to the capacity that the foam can be cut to fit the cartridge shape. Also sealing the edge of the foam to the cartridge wall is another complexity that results since wrinkles in the skin of the foam at the cartridge wall can cause unwanted air passageways.

Proposed is the replacement of reticulated foam with capillary chips or shavings to provide negative hydrostatic pressure in an ink cartridge of a TIJ

printer. The chips are made out of various materials with varying wetting angles, so that the chips can be sized and somewhat shaped to have various properties. These chips have the advantage of not requiring the cartridge medium to take on a specific shape when poured into the cartridge body since the chips are compressed to avoided mass and to conform to the shape of the cartridge. One manufacturing technique mills plastic at a controlled feed rate to form the capillary chips. Many other manufacturing techniques could also be used to produce chips at different shapes and sizes. The negative pressure that the chips...