Insulation panel for shipping cartons and method of manufacturing thereof

A method for producing insulation panels for shipping cartons, comprising:

• narrowing a web of tissue paper selected from cellulosic or synthetic tissue paper having an initial volume and thickness to increase its volume and thickness, thereby forming narrowed tissue paper web, having an initial firmness;
• optionally pre-drying said treated tissue paper to a final moisture level of 0.1-0.6% (to maximize absorption of a desirable solution);
• treating the narrowed tissue paper with a stiffening agent to increase firmness, thereby forming a treated tissue paper having a form, stiffness, and a firmness a minimum of 10% greater than the initial firmness;
• and
• drying said treated tissue paper to a final moisture level of 0.5 to 6.5%, while retaining its form and stiffness, thereby forming a dried, treated tissue paper having a top surface and a bottom surface.