Integrated system for production of thermoplastic film with two-sided superficial microengravings having a profile of semicylindrical diopters or of any microlens optical unit even of non-conventional type and products obtained thereby

摘要

Microengravings are formed on both sides of a film by impressing a microengraving on one side of the film using an embossing process performed at a first temperature and a first pressure within the range of temperatures and pressures normally used for embossing of the film material, then impressing a microengraving on the other side of the film using an embossing process performed at a second temperature lower than the first temperature and a second pressure higher than the first pressure, where the second temperature and the second pressure are selected to avoid distorting or destroying the microengraving previously impressed on the first side.