Polypropylene resin pre-expanded beads, manufacturing method the

Details Polypropylene resin pre-expanded beads, manufacturing method the Polypropylene resin pre-expanded beads, manufacturing method the

1990-03-22

1991-05-21

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

264DIG7, 264DIG9, 264DIG16, 521 56, 521 60, 521143, C08J 9232, C08J 922

Patent

active

050176218

ABSTRACT:
The present invention provides polypropylene resin pre-expanded beads formed by shrinking polypropylene resin pre-expanded beads originally having a bulk density of not higher than 0.0930 g/cc to give them a bulk volume ratio of 10-75% at normal temperature and normal pressure, a manufacturing method thereof and an expansion-molding method with the aforementioned pre-expanded beads. According to this invention, it is possible to greatly reduce storing and transporting costs per unit weight of pre-expanded beads.

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