Abstract
New recycling alternative for multilayer films was successfully presented. Food packaging formed from different materials is difficult to recycle. The use of aluminum, glass, paper, paints, varnishes, and other materials in the rolling processes from plastic packaging is intended to optimize the efficiency of packaging. Nevertheless, these materials prevent the recycling of packaging because they become contaminants to the recycling process. Food multilayered packaging containing poly (ethylene terephthalate) PET, poly (ethylene) PE and aluminum was used as filler in the preparation of composites with post-consumer high density polyethylene matrix. Composites containing up to 50 wt% of filler were feasible to prepare, allowing the obtention of a material with varied mechanical and thermal properties. This feature allows the preparation of composites suitable for specific application. The addition of multilayer matter in the polyethylene matrix provided a material with excellent mechanical properties such as higher tensile impact strength (148 J/m) and elasticity (350 MPa) as compared to pure polyethylene (40 J/m and 450 MPa).
Highlights
The addition of multilayer matter in the polyethylene matrix provided a material with excellent mechanical properties such as higher tensile impact strength (148 J/m) and elasticity (350 MPa) as compared to pure polyethylene (40 J/m and 450 MPa)
The multilayer packaging is composed of a layer of aluminum (8 μm) between a PET printed layer (12 μm) and a layer (41 μm) of a blend (70/30) of linear low-density polyethylene (LLDPE) and low-density polyethylene (LDPE)
The color depended on the original multilayer packaging used
Summary
The food packaging industry needs to develop multilayer films, with specific chemical, physical and mechanical properties, containing different polymers either by lamination or co-extrusion [5]. Composite materials were prepared by using ground multilayer films as reinforcement phase in recycled high density polyethylene (PE) matrix. Extrusion Previously, metalized multilayer packaging and post-consumer high-density polyethylene (PE) were washed and dried at 80 ̊C for 12 h Both materials were ground (4 mm × 4 mm) using a knife mill (Brand RONI, Model NFA 1533, Brazil). The prepared composites were labeled as in the example: PE/Multi, where PE represents the recycled high density polyethylene matrix with 10 wt% of multilayer packaging as reinforcement. Five different composites formulations (10, 20, 30, 40 and 50 wt% of multilayer packaging in PE matrix) were prepared
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