Plastics1.HO - Packaging Materials Polymers PKGSC 102...

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Packaging Materials - Polymers PKGSC 102 Background Packaging is the largest user of plastics, -30% of total plastics market Plastics = Polymers (for our purposes) History 1843- Maylasia - Gutta Percha derived from latex of tropical trees (Getah – sap) (Percha – strips of cloth o used for knife handles, picture frames Alfred Critchlow - Pro-phy-lac-tic Brush Co. - Dies and presses for shellac, straw pulp and gutta percha for buttons, checkers and personal care items History Civil War - $10,000 reward for substitute for ivory billiard balls. John Hyatt developed celluloid from cellulose nitrate and camphor o eventually led to material called cellophane Dr. Leo Baekeland- patented controlled reaction between phenol and formaldehyde - Resulted in Bakelite- first synthetic resin 1930’s – polyethylene first developed Today – polyethylene is the most widely used packaging plastic - 13.3 billion lbs. is used for packaging - six times more PE used than the next most popularly used plastic 1
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Nomenclature Film – less than or equal to 0,001” thick Thickness terminology Gauge Mil Inches 0.001” = 1 mil = 100 gauge Sheet – greater than 1 mil thickness Common Types of Plastics ALL PLASTICS BASED ON CARBON UNIT - C - Polyethylene H H high pressure H H H H H - C = C - - C – C – C – C – C - H H (15-45,000 psi) H H H H H Ethylene polyethylene (by product of petroleum) Polyvinyl chloride (PVC)- banned in Europe H Cl Cl H Cl H Cl H H – C C – H + HCl - C = C - - C – C – C – C – C – C - acetylene hydrochloric H H H H H H H H acid
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