STARCH BASED PACKING MATERIAL AND METHODS FOR FORMING THE MATERIAL
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United States of America Patent
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Issued Date -
Jul 4, 2024
app pub date -
Mar 18, 2024
filing date -
Sep 19, 2017
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Abstract
A processing system for producing starch based expanded products useful as packing material for shipping, packaging and insulating applications. In a first step, dense pellets or granules are formed from starch and a plasticizing agent such as polyvinyl alcohol. The starch in the pellets is generally formed, for example with an extruder, into a thermoplastic or thermosetting form for further processing. The pellets generally have an individual density of at least about 70 lbs./cubic foot and a small size for convenient delivery for the second processing step. The second process step is based on the expanding of the material from an extruder with water and using a dwell time. The process is designed such that a less expensive single screw extruder is suitable for extruding the expanded material. The starch based pellets are convenient for shipping closer to the end use location.
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