SETT ATT VID ROTATIONSGJUTNING FRAMSTELLA CELLPLASTFYLLDA FORMKROPPAR AV PLAST

摘要

A low weight synthetic plastics body comprising a moulded casing and a foam core therein comprises the sequential introduction into a mould of a first liquid polymerizable monomer composition and a second liquid polymerizable monomer composition. The two compositions contain the same monomer component but the second composition additionally contains a blowing agent. The mould is rotated around at least one axis during the introduction of the first monomer composition thereinto and is optionally subjected to pivoting movement as it undergoes the rotation. When the second monomer composition is introduced into the mould (e.g. by injection), the mould being at a suitable temperature, foaming of the composition takes place simultaneously with polymerization of the monomer.