The tonnage required in the injection moulding process depends on the area of the item being moulded and the nature of the material, sloe flow or high flow, so Tim is probably right, large items such as pirate ship hulls.
Note, too, that the article is not saying that Playmobil is buying an injection moulding machine of 3,200 tonnes, just that they use them, which implies they already have these, not that any of that investment is being spent on them.
As regards Indianna's suggestion that the comma is being used as decimal point (as is the case in Continental Europe), I don't think this is the case as a decimal point is used in the usual way in the currency figures.