Ink cartridge and expansible bladder for an ink cartridge

A method of producing an expansible bladder for use in a liquid ink cartridge, comprising:

• providing a synthetic sheet fabricated from a material having a shape-memory;
• folding the sheet in a generally “U” shape so as to produce first and second opposing wall members and thereby bias the first and second opposing wall members to a first position relative to one another, each wall member being defined by two side edges and a top edge;
• sealing the first wall member to the second wall member along the side edges and top edges of the wall members to thereby produce the expansible bladder;
• and
• wherein the synthetic sheet further defines a primary surface, and an air channel segment which protrudes above the primary surface.

An expansible bladder for use in a liquid ink cartridge, the expansible bladder comprising:

• a first synthetic sheet defining first and third wall members, the first synthetic sheet defined by a first periphery and being fabricated from a first material having a first shape-memory;
• a second synthetic sheet defining second and fourth wall members, the second synthetic sheet defined by a second periphery and being fabricated from a second material having a second shape-memory exhibiting less shape memory than the first shape-memory;
• and
• wherein the first synthetic sheet and the second synthetic sheet are generally joined along the first and second peripheries.