solvent to a minimum so that the printed carrier material does not have to be subjected to special heat treatment this feature is of critical importance and a significant advance over the methods of producing mothproofing papers heretofore used in the impregnating method and coating process sufficient solvent must be used to impregnate the carrier material completely or coat it over its entire surface in both processes the solvent has to be removed afterwards by drying since the drying step is not required in the manufacturing process according to the present invention the losses of insecticidal substance and deterioration in the quality of the insecticidal substance do not occur the division of the mothproofing composition into zones containing insecticidal substance and zones free from insecticidal substance which is achieved by the printing method which is used according to the present invention has a number of advantages the zones containing insecticidal substance and those free from insecticidal substance are arranged on the carrier material in such a way that the waste material cut off during packaging is free from insecticidal substance the waste material can therefore be recycled without any special precautions different insecticidal substances or adjuvants which are not chemically compatible with each other can be applied to the carrier material by separating them spatially the areas on the carrier material containing insecticidal substance are easily distinguishable from those of the carrier material free from insecticidal substance by the difference in background color usually a deepening of color by about 2 tones the dwindling of the insecticidal activity of the insecticidal paper is indicated by the disappearance of this color difference by imprinting specific areas of the.