eets are made of felt, in particular acicularfelt, or conventional fabric, which involves various drawbacks. Firstly, felt or conventional fabrics, mainly onaccount of not always being of even thickness, fail toprovide for thin, top-quality finished products, and aretherefore unsuitable for producing boxes or packages forselec items such as perfume, ornaments, etc., unless theoutput speed of the machine is greatly reduced. Moreover,felt or conventional fabrics, which must be joined whenfitted to