Thermal transfer recording medium including base material layer, first ink layer, and second ink layer, printing device, and cassette accommodating thermal transfer recording medium

A printing device configured perform:

• a heating process heating a thermal transfer recording medium in a state where the thermal transfer recording medium is in contact with a printing medium, the thermal transfer recording medium including:
• a base material layer;
• a first ink layer containing first ink;
• and a second ink layer containing second ink, the base material layer, the first ink layer, and the second ink layer being laminated in this order;
• a cooling process cooling the thermal transfer recording medium heated in the heating process;
• and
• a transfer process transferring at least part of the first ink and the second ink onto the printing medium by applying external forces to both the base material layer and the second ink layer of the thermal transfer recording medium cooled in the cooling process in directions away from each other,
• wherein in the heating process and the cooling process:
• the printing device heats a first portion of the thermal transfer recording medium to a temperature higher than or equal to a first temperature and lower than or equal to a second temperature and subsequently cools the first portion to a temperature lower than or equal to a third temperature to place the first portion in a first state, and the printing device heats a second portion of the thermal transfer recording medium to a temperature higher than the second temperature and subsequently cools the second portion to a temperature lower than or equal to the third temperature to place the second portion in a second state,
• wherein in the transfer process:
• the printing device applies the external forces to break the thermal transfer recording medium between the first ink layer and the second ink layer or within the second ink layer at the first portion of the thermal transfer recording medium and transfer the second ink onto the printing medium, a sum of thicknesses of all transferred layers being thinner than a thickness of the first ink layer;
• and
• the printing device applies the external forces to break the thermal transfer recording medium between the first ink layer and the base material layer or within the first ink layer at the second portion of the thermal transfer recording medium and transfer the first ink and the second ink onto the printing medium.

A cassette accommodating therein:

• a thermal transfer recording medium comprising:
• a base material layer;
• a first ink layer containing first ink;
• and
• a second ink layer containing second ink;
• and
• a printing medium onto which a portion of the thermal transfer recording medium is to be thermally transferred,
• wherein in the thermal transfer recording medium, the base material layer, the first ink layer, and the second ink layer are laminated in this order, at least a portion of the first ink layer and the second ink layer being configured to be thermally transferred onto the printing medium,
• wherein when external forces are applied to both the base material layer and the second ink layer in directions away from each other in a first state, a breakage occurs between the first ink layer and the second ink layer or within the second ink layer, the first state being a state in which the thermal transfer recording medium has been heated to a temperature higher than or equal to a first temperature and lower than or equal to a second temperature and subsequently cooled to a temperature lower than or equal to a third temperature,
• wherein when the external forces are applied in a second state, a breakage occurs between the first ink layer and the base material layer or within the first ink layer, the second state being a state in which the thermal transfer recording medium has been heated to a temperature higher than the second temperature and subsequently cooled to a temperature lower than or equal to the third temperature, and
• wherein a sum of thicknesses for all layers that break apart and separate from the base material layer side in the first state is thinner than a thickness of the first ink layer.