| 摘要 |
<p>A polymeric load carrying apparatus and method of manufacture is discloses. The apparatus comprises an outer shell composition and a filled inner core composition within the outer shell composition. The outer shell composition comprises less than 10% filler, and preferably substantially no filler, by weight, and the inner core composition comprises more than 15% filler, and preferably at least 40% filler, by weight. The filler may be a mineral sand or calcium carbonate. A first polymer feedstock is introduced into a mould, which is rotated and heated to at least partially form the outer shell. A second polymer feedstock, with more than 15% filler, is introduced into the outer shell to form the inner core. The mould is cooled. Blow or injection moulding techniques may be employed instead of rotational moulding. The polymer may be polyethylene, preferably high density polyethylene. The inner core may be foamed.</p> |
