Heat insulation blanket includes a layer of inner cells containing a phase change material, and opposed outer cells containing dead air or other undisturbed gas. The first combustion chamber features an open and a closed end, and the first combustion chamber has a fuel inlet arranged at its closed end. The open-drawer locking arrangement including an activation arm accessible from the front of the drawer and a locking piece located at the rear of the drawer. The movable roll paper positioning plates 31 and 32 have roll paper positioning surfaces 31a and 32a which can contact the outside circumference part of the ends 10b and 10c of the roll paper 10. Then, the mold is removed to obtain elements formed by the mold.