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Eco-Houses Based on Eco-Friendly Polymer Composite Construction Materials Conventional molding techniques applied for manufacturing of eco-composites.

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Presentation on theme: "Eco-Houses Based on Eco-Friendly Polymer Composite Construction Materials Conventional molding techniques applied for manufacturing of eco-composites."— Presentation transcript:

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

3 Originally plastics were developed to replace natural materials, Nowadays, natural materials are developed to replace plastics

4 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. MOLDING TECHNIQUES WHICH WERE APPLIED IN ECO-PCCM PROJECT

5 Materials used for CM - SMC ( Sheet Molding Compounds) - BMC (Bulk Molding Compounds) - Pellets/granules

6 CM Techniques 1. No mold technique - appropriate for SMC, prepregs 2. Matched die technique – appropriate for BMC, pellets

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

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

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

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

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

15 Pellets MATCHED DIE TECHNIQUE

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17 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. MOLDING TECHNIQUES WHICH WERE APPLIED IN ECO-PCCM PROJECT

18 INJECTION MOLDING PROCESS SCHEME

19 PLA

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

21 SMCPellets Appropriate for big size panels No molding tool is required Multiple panels can be produced in one molding cycle Cheaper manufacturing process Better mechanical properties since longer fibers can be applied Applicable only for flat and/or slightly curved shapes Inappropriate for big size panels Molding tool is required One panel only per cycle Expensive manufacturing process Only very short fibers can be used making panels with limited mechanical properties Better control of fiber/resin ratio Applicable for 3D shapes Major differences between applied forms of materials

22 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.

23 THANK YOU FOR YOUR ATTENTION


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