a process for the manufacture of a hot - melt , pressure - sensitive adhesive substance with surfces that are not sticky or self - adhesive , which includes casting such a substance in a mold that has been previously coated with a protective web created by spinning a hot - melt , non - pressure - sensitive adhesive and of protecting the surface of the casting with a similar web . for this purpose , fiberization nozzles are advantageously employed . these protective webs are very resistant and , since they participate in the solidity of the block , they make possible the flexible packaging of adhesives with a low mass mechanical strength .