Method for producing synthetic resin molded article in which marine floating plastic waste is used

A method for manufacturing a synthetic resin molded product using ocean floating plastic trash, the method comprising:

• dividing recovered ocean floating trash into a group including ocean floating plastic trash, and a second material not molten under a temperature condition of 200° C., and a group other than this, thereby sorting the ocean floating plastic trash including a plurality of kinds of plastics mixed therein and the second material from the recovered ocean floating trash;
• crushing the sorted ocean floating plastic trash and second material to a diameter or a side of 5 mm or less, or a weight of 0.1 g or less;
• mixing crushed products of the ocean floating plastic trash and the second material by a mixer;
• supplying a mixture of the ocean floating plastic trash and the second material to a grinding device, and grinding the mixture into a powder with a diameter or a side of 1 mm or less;
• and
• supplying the resulting powder as a raw material for a synthetic resin molded product to a molding machine, and carrying out a molding step.