tailieunhanh - Coatings of Polymers and Plastics part 14

Tham khảo tài liệu 'coatings of polymers and plastics part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 314 Eller Coextruded Films Coextruded multilayer films to achieve surface decorative effects and provide surface weathering resistance are well established in the appliance recreational vehicle and pool spa industry. Recently coextruded films have been applied to automotive surfaces . MY 2002 DaimlerChrysler Neon and the Smart Car for bumper fascia and roof surfaces. This construction to be used is evolving but is likely to consist of a five-layer structure of surface film adhesive color layer adhesive thin sheet TPO or HDPE . The thin sheet layer is designed to adhere to the injected layer. An extruded layer may be substituted for the injected layer in applications in which the entire structure is thermoformed . adaptation of major appliance and pool spa fabrication methods . The initial constructions appear to be capable of offering fabrication cost savings over painted parts such as bumper fascia but it is too early for a definitive economic comparison due to the uncertainties of scrap rate cycle time effects ability to match metallic colors on painted metal surfaces etc. 7 SUMMARY Coatings for polymer substrates offer the automotive OEM a broadened range of protective decorative and tactile capabilities that will develop with the following trends Liquid vs. Alternative Coatings Liquid coatings on hard surfaces will come under increasing pressure from In-mold decoration based on coextruded films and back-printed films Molded-in decorative effects and OEM objectives to eliminate coatings from hard and soft interior surfaces where possible. Skins The invisible airbag door will continue to be a key IP skin driver. Slush molding and spray PU will continue to gain share versus vacuum forming. Spray PU will show the greatest short-term gains. If TPO slush compounds are developed that are capable of meeting scratch resistance requirements and are capable of being used without coatings they could see share gains. Skins capable of being used in in-line