Propellant with pattern-controlled burn rate

A propellant, comprising:

• a flexible sheet defining a first surface, a second surface, a first edge, and a second edge, the flexible sheet having an ignitable material deposited on the first surface, the ignitable material being deposited in a pattern, the pattern defining at least one covered sheet portion upon which ignitable material has been deposited and at least one uncovered sheet portion upon which ignitable material is not present, the covered and uncovered sheet portions being predetermined to provide a predetermined ignition rate or a predetermined pressure curve within a pressure vessel;
• boron deposited on the second surface;
• and
• a capping layer deposited on the boron.

A firearm cartridge, comprising:

• a casing, the casing having a side wall, an interior portion within the side wall, an open front end, a back end, a primer pocket defined within the back end, and a flash hole defined between the primer pocket and the interior portion;
• a propellant, comprising a flexible sheet defining a first surface, a first edge, and a second edge, the flexible sheet having an ignitable material deposited thereon, the ignitable material being deposited in a pattern, the pattern defining at least one covered sheet portion upon which ignitable material has been deposited and at least one uncovered sheet portion upon which ignitable material is not present, the covered and uncovered sheet portions being predetermined to provide a predetermined ignition rate or a predetermined pressure curve within a pressure vessel;
• a nonburnable tube defining a pair of ends and a passageway therebetween;
• the flexible sheet being rolled around the nonburnable tube;
• the propellant being disposed within the interior portion of the casing, the first edge of the flexible sheet being adjacent to the back end of the casing, the second edge of the flexible sheet being adjacent to the front end of the casing, one end of the nonburnable tube being disposed over the flash hole, with the flash hole being in communication with the passageway.

A firearm cartridge comprising:

• a casing, the casing having a side wall, an interior portion within the side wall, an open front end, a back end, a primer pocket defined within the back end, and a flash hole defined between the primer pocket and the interior portion;
• a propellant, comprising a flexible sheet defining a first surface, a first edge, and a second edge, the flexible sheet having an ignitable material deposited thereon, the ignitable material being deposited in a pattern, the pattern defining at least one covered sheet portion upon which ignitable material has been deposited and at least one uncovered sheet portion upon which ignitable material is not present, the covered and uncovered sheet portions being predetermined to provide a predetermined ignition rate or a predetermined pressure curve within a pressure vessel, wherein the pattern includes a series of triangular covered portions, each covered portion defining a base adjacent to the first edge, and an apex adjacent to the second edge;
• a nonbumable tube defining a pair of ends and a passageway therebetween;
• the flexible sheet being rolled around the nonburnable tube;
• and
• the propellant being disposed within the interior portion of the casing, the first edge of the flexible sheet being adjacent to the back end of the casing, the second edge of the flexible sheet being adjacent to the front end of the casing, one end of the nonburnable tube being disposed over the flash hole, with the flash hole being in communication with the passageway.

A firearm cartridge, comprising:

• a casing, the casing having a side wall, an interior portion within the side wall, an open front end, a back end, a primer pocket defined within the back end, and a flash hole defined between the primer pocket and the interior portion;
• a propellant, comprising a flexible sheet defining a first surface, a second surface, a first edge, and a second edge, the flexible sheet having an ignitable material deposited on the first surface, the ignitable material being deposited in a pattern, the pattern defining at least one covered sheet portion upon which ignitable material has been deposited and at least one uncovered sheet portion upon which ignitable material is not present, the covered and uncovered sheet portions being predetermined to provide a predetermined ignition rate or a predetermined pressure curve within a pressure vessel;
• a nonburnable tube defining a pair of ends and a passageway therebetween;
• the flexible sheet being rolled around the nonburnable tube;
• the propellant being disposed within the interior portion of the casing, the first edge of the flexible sheet being adjacent to the back end of the casing, the second edge of the flexible sheet being adjacent to the front end of the casing, one end of the nonburnable tube being disposed over the flash hole, with the flash hole being in communication with the passageway;
• and
• further comprising boron deposited on the second surface.

A firearm cartridge, comprising:

• a casing, the casing having a side wall, an interior portion within the side wall, an open front end, a back end, a primer pocket defined within the back end, and a flash hole defined between the primer pocket and the interior portion;
• a propellant, comprising a flexible sheet defining a first surface, a first edge, and a second edge, the flexible sheet having an ignitable material deposited thereon, the ignitable material being deposited in a pattern, the pattern defining at least one covered sheet portion upon which ignitable material has been deposited and at least one uncovered sheet portion upon which ignitable material is not present, the covered and uncovered sheet portions being predetermined to provide a predetermined ignition rate or a predetermined pressure curve within a pressure vessel, the flexible sheet comprising a polymer layer;
• a nonburnable tube defining a pair of ends and a passageway therebetween;
• the flexible sheet being roiled around the nonburnable tube;
• the propellant being disposed within the interior portion of the casing, the first edge of the flexible sheet being adjacent to the back end of the casing, the second edge of the flexible sheet being adjacent to the front end of the casing, one end of the nonburnable tube being disposed over the flash hole, with the flash hole being in communication with the passageway.