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Eco-Houses Based on Eco-Friendly Polymer Composite Construction Materials

Eco-Houses Based on Eco-Friendly Polymer Composite Construction Materials. Conventional molding techniques applied for manufacturing of eco-composites. Workshop , Ohrid 13-15 September 2007. Originally plastics were developed to replace natural materials, Nowadays, natural materials are

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Eco-Houses Based on Eco-Friendly Polymer Composite Construction Materials

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  1. Eco-Houses Based on Eco-Friendly Polymer Composite Construction Materials Conventional molding techniques applied for manufacturing of eco-composites Workshop , Ohrid 13-15 September 2007

  2. Originally plastics were developed to replace natural materials, Nowadays, natural materials are developed to replace plastics

  3. MOLDING TECHNIQUES WHICH WERE APPLIED IN ECO-PCCM PROJECT 1. Compression molding CM was the major method for processing plastics during the first half of the previous century. It is a process of applying heat and pressure to a plastic material in matched or open dies. The plastics melts due to the heat, then the pressure causes it to form into a desired shape. This is done in a compression molding press. This process is classified as high pressure process. Although this technology is the main processing method used with thermoset plastics, it can also be employed to process themoplastic materials The advantages of compression molding are short cycle time, high production rate and excellent surface finishes.

  4. Materials used for CM • SMC ( Sheet Molding Compounds) • BMC (Bulk Molding Compounds) • Pellets/granules

  5. CM Techniques No mold technique - appropriate for SMC, prepregs Matched die technique – appropriate for BMC, pellets

  6. Piston SMC Guide 1.a No mold, single-opening press Stack of material Supporting plate Heated press platen

  7. Press piston Hot plate Polster Release foil SMC layers Thermocouple Press plate Blown-out press package

  8. 2. No mold, multi-opening press MULTI-PANEL PACKAGE Release foil SMC Stainless steel press plate

  9. Piston SMC Guide MATCHED DIE TECHNIQUE Stack of material Supporting plate Press platen

  10. Matched die molding Appropriate for BMC , pellets and for SMC (simple shapes only) SMC Open mold Closed mold

  11. Pellets MATCHED DIE TECHNIQUE

  12. MOLDING TECHNIQUES WHICH WERE APPLIED IN ECO-PCCM PROJECT 2. Injection molding Injection molding is a manufacturing technique for making parts from both thermoplastic and thermosetting plastic materials . Molten plastic is injected at high pressure into a mold, which is the inverse of the product's shape. Injection molding is widely used for manufacturing a variety of parts, from the smallest component to entire body panels of cars. Injection molding is the most common method of production, with some commonly made items including bottle caps and outdoor furniture.

  13. INJECTION MOLDING PROCESS SCHEME

  14. PLA

  15. Injection molding Appropriate for rather complicated and dimensional precise shapes Kenaf / PLA molding IM is the mostly used processing technique for PHB, PLA, PLLA plastics

  16. Major differences between applied forms of materials

  17. CONCLUSION • Biodegradable plastics can be processed as classic thermoplastics • No exclusive technology for processing is required • Typical processing techniques: IM, CM, extrusion • No limitation for processing on classic machines • Biodegradable plastics (PLA, PHB, PLLA) are polyesters obtained from renewable resources. The products are waterproof, heat resistant, have appealing surfaces, and are fully biodegradable.The pellets are processed on standard machines. The melt behaves like liquid crystalline polymers (LCP's). This property allows to mold thin walled or complex structures even on small machines.

  18. THANK YOU FOR YOUR ATTENTION

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