| 摘要 |
A method of forming a composition of expanded polylactic acid (PLA) resin beads comprising impregnating PLA resin beads with CO2 and holding the impregnated beads at a temperature and pressure that prevents the beads from foaming while allowing the level of impregnated CO2 to reduce. The method may comprise pre-expanding the beads at a pre-expansion temperature. Promptly following pre-expansion or after a desired storage period, the method may comprise introducing the pre-expanded beads into a mould and further expanding and fusing the beads in the mould by application of a temperature greater than the temperature used for pre-expansion. Preferred moulded products include moulded blocks and shaped moulded products, especially blocks adapted to form packing material. Other preferred moulded products include convenience items such as containers including clamshell containers, pots, boxes, bowls, cups, plates and trays. |
