Winding core and winding core manufacturing method

A winding core obtained by molding a resin composition comprising:

• at least one type of amorphous resin (A) selected from a styrene resin, a polycarbonate, a polyarylate, a polyphenylene oxide and a polysulfone;
• a polylactic acid (B);
• and an inorganic filler (C);
• wherein the ratio of length [L] to inner diameter [D] (length [L]/inner diameter [D]) of the winding core is 2 or more;
• and
• wherein the resin composition comprises:
• from 50 to 80 parts by mass of the amorphous resin (A), and from 20 to 50 parts by mass of the polylactic acid resin (B) (wherein the total amount of the amorphous resin (A) and the polylactic acid (B) is 100 parts by mass).

A method of manufacturing a winding core, the method comprising the steps of:

• obtaining a resin composition comprising:
• at least one type of amorphous resin (A) selected from a styrene resin, a polycarbonate, a polyarylate, a polyphenylene oxide and a polysulfone;
• a polylactic acid resin (B);
• and an inorganic filler (C);
• by mixing from 50 to 80 parts by mass of the amorphous resin (A), from 20 to 50 parts by mass of the polylactic acid resin (B), and from 10 to 40 parts by mass of the inorganic filler (C) (wherein the total amount of the amorphous resin (A) and the polylactic acid (B) is 100 parts by mass);
• and
• molding the resin composition to obtain a winding core.

A method of manufacturing a winding core, the method comprising the steps of:

• obtaining a resin composition comprising:
• at least one type of amorphous resin (A) selected from a styrene resin, a polycarbonate, a polyarylate, a polyphenylene oxide and a polysulfone;
• and a polylactic acid resin (B);
• by mixing from 50 to 80 parts by mass of the amorphous resin (A), and from 20 to 50 parts by mass of the polylactic acid resin (B) (wherein the total amount of the amorphous resin (A) and the polylactic acid (B) is 100 parts by mass);
• and
• molding the resin composition to obtain a winding core;
• wherein the ratio of length [L] to inner diameter [D] (length [L]/inner diameter [D]) of the winding core is 2 or more.