to quibble―refine―subtilize―split hairs
理窟をひねくる - 斎藤和英大辞典
Waste plastics recovered from used home electric appliances are reused as parts and materials for producing home electric appliances. This is called “self-circulation material recycling.”Used products are manually disassembled to subtilize and recover waste plastics by manufacturers in collaboration with recycling operators.
使用済家電製品から回収した廃プラスチックを家電製品の部材として再利用する「自己循環型マテリアルサイクル」を実施。 - 経済産業省