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Individual
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Individual
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Priority to ES8701634ApriorityCriticalpatent/ES2004737A6/en
Publication of ES2004737A6publicationCriticalpatent/ES2004737A6/en
The process which imparts greater rigidity and moisture resistance, consists of (a) preparing a bath of paraffin wax or similar waterproofing agent maintained in the molten state (b) immersing the cardboard in the bath at constant temp., so that it is impregnated and saturated (c) removing the cardboard and placing it on absorbent material to remove surplus wax and (d) drying and cooling the cardboard to solidifying the wax.