Heat Treatment Device for Use in a Hot Press to Transfer a Treatment Composition to a Substrate

A method of treating a fibrous substrate prior to forming an image thereon, the method comprising:

• positioning a treatment sheet adjacent to the fibrous substrate, wherein the treatment sheet comprises a base sheet saturated with a treatment composition;
• positioning a heat treatment device onto the treatment sheet, wherein the heat treatment sheet comprises a board formed and a flexible pad attached to the board, wherein the flexible pad comprises a conformable surface;
• pressing the board of the heat treatment device with the hot press member such that the conformable surface of the flexible pad presses onto the treatment sheet to transfer the treatment composition from the treatment sheet to the fibrous substrate using a wetting solution to carry the salt from the treatment sheet into the fibrous substrate;
• removing the heat treatment device and the treatment sheet from the fibrous substrate;
• and
• drying the fibrous substrate with the hot press member such that the salt remains in the substrate.