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Common Manufacturing Processes for Plastics
Transcript of Common Manufacturing Processes for Plastics
Water Bottle and Walmart Bagss: Blow Molding
Extrusion Blow Molding
Injection Blow Molding
Kayaks: Rotational Molding
Blown Film Extrusion
Benefits of Plastics Processing
Many of the processes are net shape processes
In general, less energy is employed than in metalworking processes
Lower temperatures are required to process plastics than metals or ceramics
Great flexibility in geometry
Painting and other finishing processes are generally not required
Issues in Plastics Processing
Plastics are not as strong or stiff as metals and should not be used in applications where high stresses will be encountered
Impact resistance of plastics is general good, better than many ceramics
Service temperatures of plastics are limited relative to engineering metals and ceramics
Thermal expansion is greater for plastics than metals
Dimensional changes due to temperature variations are much more significant than for metals
Many types of plastics degrade from sunlight and certain other forms of radiation
Some plastics degrade in oxygen and ozone atmospheres.
Plastics are soluble in many common solvents