Reinforced sports racket frame - has honeycomb structure part of which is filled with dense material

摘要

The frame for sports rackets is reinforced by a honeycomb structure. One or more selected cells of this are filled with a material that has a density of at least 2 kg/ cubic decimetre. For rackets that have a honeycomb structure covered with an aluminium alloy cover, the filling is a mixture of an organic binder and zinc powder.