Polymer Extrusion
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Beschreibung
Extrusion is by far the most important and the oldest processingand shaping method for thermoplastic polymers. This processconcerns almost all synthetic polymers, as well as elastomers orfood materials. Single-screw extrusion is mainly usednowadays to manufacture finished goods or semi-finished products.More than 90 million tons of thermoplastics are therefore processedevery year.
Twin-screw extrusion may be divided into two systems:contra-rotating systems used within the context of PVC extrusion,for the manufacture of pipes or profiles; and co-rotating systemsexperiencing nowadays a very significant development, because oftheir significant adaptability and flexibility, which enables themanufacture of specific materials (polymer alloys, thermoplasticelastomers, filled polymers, nanocomposites). Extrusion is carriedout by passing molten polymer through a tool called die that willgive the product its final shape (films and sheets, rolledproducts, and electric cables). Thanks to the design of dies, weobtain at the output a product with controlled dimensions, uniformspeeds and homogeneous temperatures. The book will discuss the sameproduction types, but only in the case of coextrusion flows, i.e.multilayer stratified products. First of all, we will presentin this book the physics of the mechanisms at stake, then proposemore or less complex models in order to describe these mechanismsand then go forward in the interpretation of results and thecontrol of condition flows.
Autor*in
Pierre G. Lafleur
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Materials Science Materialwissenschaften Metalle u. Legierungen Metals & Alloys