Tools supporting and heating device for tools like printing plates, used for diecutting and hot pressure transfer of portions of metallic films on a substrate. The method is carried out in two steps, viz. An inlet hopper is connected to the inlet opening and a blow back shield is mounted in the upper end portion of the hopper with the shield including an outer layer of clear synthetic material extending across the hopper and an inner layer of synthetic material extending part way underneath the length of the layer of clear synthetic material.