Unit_8_-_Plastic_Packaging (4)

Unit_8_-_Plastic_Packaging (4) - how many packages of our...

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A 12 mil thick plastic sheet would be 12/1000 of an inch thick or 0.012 inches thick. A mil is not the same as a millimeter; mil is a unit in the English system, and millimeter is a unit in the metric system. Fortunately, for plastic film and sheet we do not have the problem that we encountered with paper, where the units for basis weight differed depending on whether the material was categorized as paper or paperboard. Rather than using a concept like basis weight or grammage, which are weight per area, we flip this on its head and talk about yield, which is area per weight. Plastic is usually sold by the pound, so we need to know the yield to know
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Unformatted text preview: how many packages of our specified size we can get from the amount of material we are purchasing. Common units for yield are square inches per pound and square meters per kilogram. There are several primary plastic forming methods used to manufacture plastic packages or to convert materials into plastic packaging. The plastic forming methods which will be discussed in this section include: Extrusion Coextrusion Film casting Film blowing Thermoforming Lamination Injection molding Extrusion blow molding Injection blow molding Injection stretch blow molding 1 mil = 1/1000 of an inch = 0.001 inches...
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This note was uploaded on 03/04/2012 for the course PKG 101 taught by Professor Haroldhughes during the Spring '08 term at Michigan State University.

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