Skin package with transparent back window

摘要

A skin package having a single backing board having an adhesion-promoting coating on one side, an opening through the board, a transparent window covering that opening and a transparent heat-sealable thermoplastic film extending over the board and covering product disposed over and displayed through the window. The backing board with its adhesion-promoting coating is permeable to the passage of air. The material of which the transparent window is formed is in most cases substantially impermeable to the passage of air. It covers all of the window but substantial gas-permeable area around the window remains. The window is preferably heat sealed to the adhesion promoting layer. The top film, which may be either preformed or extruded in situ, is vacuum drawn around the product displayed and is heat sealed.