Most of a dragonfly's life is spent in the larval stage where it molts from six to fifteen times. Depending on altitude and latitude, larval development varies from the common one or two years to as many as six years.
HOME. OPS (Biaxially Oriented Polystyrene Sheet) is a thermoformable sheet produced by stretching polystyrene in two directions, lengthwise and crosswise. OPS can be used widely for transparent containers such as lids, trays, and foldable food containers because it has high transparency, rigidity and hygiene.Manufacturing Process of OPS Applications of OPS Most of OPS are used for food packaging containers such as food packs, trays, lids and fruit containers.PS can be used widely for transparent containers such as lids, trays, and foldable food containers because it has high transparency, rigidity and hygiene. Manufacturing Process of OPS Applications of OPS Most of OPS are used for food packaging containers such as food packs, trays, lids and fruit containers.
6:33 AM How to inject Polystyrene, injection process, Injection speed, Polystyrene, Shrinkage No comments. Polystyrene is one of the best materials for injection moulding. Cycle times with polystyrene are usually short due to ease of melting, fluidity and reasonable set up times.Complex tooling can be used. The surface finish of the final product is also good, and the low mould shrinkage of polystyrene is a useful factor.owever, there are limits as too high injection speed can cause faults such as material degradation, air inclusion (bubbles), and burn marks due to inadequate tool venting. Shrinkage. As with every plastic material, polystyrene shrinks during cooling.