Patent ID: 6994232

Claim:
A cartridge ( 10 ) for dispensing an extrudable fluid, the cartridge ( 10 ) comprising: a cylindrical body ( 12 ) for holding the fluid, the body ( 12 ) having opposing open ends ( 14 , 16 ) and formed of a wound material and lined internally with a liner material, the liner material overlapping itself to form a raised area ( 34 ) that is slightly thicker than the surrounding area; a dispensing fitment ( 20 ) for sealing one open end ( 16 ) of the cylindrical body ( 12 ); and a plunger ( 18 ) comprising a slightly convex surface ( 36 ) and a sidewall ( 40 ) extending upward from the periphery of the convex surface ( 36 ), the sidewall ( 40 ) comprising a bottom section ( 42 ) nearest the convex surface ( 36 ), a middle section ( 44 ) adjacent the bottom section ( 42 ), and an upper section ( 46 ), the bottom section ( 42 ) having an outer diameter less than the inner diameter of the cylindrical body ( 12 ), the middle section ( 44 ) having an outer diameter greater than the outer diameter of the bottom section ( 42 ) but less than the inner diameter of the cylindrical body ( 12 ), the upper section ( 46 ) forming a snug fit with the cylindrical body ( 12 ); and an air venting channel (A) adjacent the raised area ( 34 ) and defined by the plunger sidewall ( 40 ) and the cylindrical body ( 12 ).