| 摘要 |
<p>PET foam is processed (24) into flakes. The flakes are densified (26) in a pellet mill at between about 300 °F and about 350 °F to produce pellets. The pellets are then dried (28) in a desiccant dryer at about 350 °F for about 6 hours, so that the dew point of the pellets reaches about - 40 °F. The dried pellets have an intrinsic viscosity about equal to virgin PET and a crystallinity greater than 20 %. This material can be reused (30) as if it were virgin PET.</p> |
