PKSC 1020 Lecture Notes - Lecture 8: Plastics Extrusion, Thermoforming, Paperboard
26 Sep 2017
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Cannot be deformed except by imposing a relatively massive force. Deformation will result in breakage or other permanent damage. Ex: glass bottle (glass only exists in rigid form) When force is removed, it returns to original shape. Takes on the shape of a product. When distorting force is removed it does not return to original shape. Ex: cany bar wrapper or potato chip bag. Paperboard - corrugated, spiral and convoluted cans, set up boxes. Glass only comes in one form- rigid. Plastics injection molded and some thermoformed, depends on the plastic used. Not really a closure but is part of the seal. Foil lined inner seal is flexible form. Other types of closures: child resistant (90%) test group can"t access, tamper evident (visual indicator to show evidence, dispenser of pump style. Folding cartons, backing for blister packages, pulp egg cartons & berry boxes. Purpose is to combine the best properties into a single structure at the lowest cost.
