2. Modification of final properties

2.1 Justify the extra cost due to biopolyester density

Biopolyesters are materials with a density greater than 1. In the most common case to date, PLA, the density is even 1.25... Comparing these densities with those of polyolefins reveals a cost premium. However, all hope is not lost, for two main reasons:

• polystyrene expansion technologies have been adapted to biopolyesters, enabling reductions in bulk density of over 50% to be achieved;

• in the case of PLA, we're dealing with a very rigid material, favoring thickness reduction policies.

The implementation of biopolyesters is therefore an opportunity to launch a coherent sustainable development policy (reduction of...