This work analyzes the designer`s contribution to the creation of characters/puppets, having as main concept the creative re- use of PET bottles and other discarded materials. Based on the principle that the know-how about materials is one of the main requests for a product creation, this dissertation proposes an investigation of PET materials on the puppets` craft. It shows how the designer can appropriate of this material and make it participate in the signifying web. By resignifying the PET as a communication tool, it gives the material, potentially harmful to the environment, a new social use. In a second moment, using the concept of appropriation developed by Roger Chartier, we present the Puppet Theater as a medium to establish new meanings, which contributes to knowledge.