1. 2 Plastic compounding…… 3 4 Where is used compounding of plastics Industries Served:  Construction  Auto  Wire and Cable  Durables  Consumer.

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Presentation transcript:

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Plastic compounding…… 3

4 Where is used compounding of plastics Industries Served:  Construction  Auto  Wire and Cable  Durables  Consumer Products  Industrial Applications  Aerospace  Electrical & Electronics  Health Care

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Compression moulding Injection moulding Transfer moulding Extrusion moulding Moulding types 6

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Compression Molded Parts Mold Part

Compression Molded Parts

Compression Machines

Ken Youssefi Mechanical Engineering Dept. 14 Reinforced plastics Polymer matrix composites (PMC) and fiber reinforced plastics (FRP) are referred to as Reinforced Plastics. Common fibers used are glass (GFRP), graphite (CFRP), boron, and aramids (Kevlar). These fibers have high specific strength (strength-to-weight ratio) and specific stiffness (stiffness-to-weight ratio) Matrix materials are usually thermoplastics or thermosets; polyester, epoxy (80% of reinforced plastics), fluorocarbon, silicon, phenolic.

Ken Youssefi Mechanical Engineering Dept. 15 Reinforcing fibers Glass – most common and the least expensive, high strength, low stiffness and high density. GFRP consists 30-60% glass fibers by volume. – highest specific strength, toughest fiber, undergoes plastic deformation before fracture, but absorbs moisture, and is expensive. Aramids (Kevlar) – boron fibers consist of boron deposited on tungsten fibers, high strength and stiffness in tension and compression, resistance to high temperature, but they are heavy and expensive. Boron – more expensive than glass fibers, but lower density and higher stiffness with high strength. The composite is called carbon-fiber reinforced plastic (CFRP). Graphite (99% carbon) or Carbon (80-95% carbon) The average diameter of fibers used is usually less than.0004 inch (.01 mm). The tensile strength of a glass fiber could be as high as 650 ksi (bulk glass S u = ksi)