They are made of paperboard (75%), polyethylene (20%), and aluminum (5%), which gives them some important features: the aluminum avoids light and oxygen penetration inside the container the polyethylene provides a biological sealing and the paperboard gives structure and support to the container. Some other recycled products are transformed into new products such as the tetrapak TM containers, which are widely used in the food industry due to their preserving advantages (especially for beverages/liquids). In general, a recycled product could be transformed into a raw material repeatedly, e.g., glass, metals, paper, and plastics. Indeed, the culture of recycling is of the utmost importance: a process that involves not only recycling the existing products, but also designing and producing new products through the recycling process. The world's population is continuously growing, and currently, each human being adds a significant amount of waste to the planet during his lifetime. Keywords: Holographic interferometry non-destructive testing surface measurements thermal effects However, its thermal insulation properties are better than those of the clay roof tile. The results show a greater deformation profile from the poly-aluminum tile compared with the classic clay tile. The retrieved optical phase renders the tiles surface's deformation at three different temperature values: 26, 36 and 46 degrees on a Celsius scale. The optical system, based on a sensitive out-of-plane interferometer configuration, records several image holograms from a controlled heat source that raises the temperature on the tile's surface. This work reports an optical nondestructive comparison study of the surface deformation in poly-aluminum and clay roof tiles exposed to heat radiation. Once recycled, the two latter materials form a new composite named poly-aluminum, which is employed to manufacture roof tiles that serve as environmental protection against solar radiation and rain. This material consists of thermally joint layers of paper, aluminum, and polyethylene. It is through the recycling process that disposed waste materials could regain a new purpose on their use, take for instance the tetrapak TM packaging.
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