METHOD FOR REMOVING FLAKE FOREIGN MATTER IN RECYCLING OF PET BOTTLE

摘要

PROBLEM TO BE SOLVED: To inexpensively and accurately remove foreign matter contained in a bottle ground material in order to effectively putting the recycle material of a PET bottle to practical use to effectively use the same as a raw material of engineering plastic in large quantities and to inexpensively provide pellets, which can be molded into a molded product reduced in the content of foreign matter when molded into an injection mold product, to a user in large quantities. SOLUTION: The method for removing flake foreign matter is adapted when a recovered PET bottle is reutilized and has a process (A) for selectively removing a metal in the ground foreign matter present in ground flakes by a metal detector, a process (B) for irradiating the ground foreign matter present in ground flakes with light to measure the brightness of the surfaces of the flakes to selectively remove foreign matter low in brightness, a process (C) for washing the ground flakes and a process (D) for sorting the ground flakes on the basis of specific gravity.