Fiber-reinforced thermoplastic resin filament and shaped product of same
A fiber-reinforced thermoplastic resin filament is obtained by impregnating a continuous reinforcing fiber with a thermoplastic resin, and satisfies all of conditions (a) to (c). (a) The volume ratio of a reinforcing fiber in a fiber-reinforced thermoplastic resin filament is 30 to 80%; and the volume ratio of a thermoplastic resin in a fiber-reinforced thermoplastic resin filament is 70 to 20%. (b) The thickness of a fiber-reinforced thermoplastic resin filament is 0.01 to 3 mm. (c) The length of a filament contained in a fiber-reinforced thermoplastic resin filament is 1 m or more.
1. A fiber-reinforced thermoplastic resin 3D printing filament of continuous reinforcing fiber impregnated with a thermoplastic resin, having
(a) a volume content of the reinforcing fiber of 30 to 80 vol % and a volume content of the thermoplastic resin filament of 70 to 20 vol %,
(b) a thickness of 0.01 to 3 mm,
(c) a filament length of 1 m or more, and
(d) a circular filament cross section.
2. The fiber-reinforced thermoplastic resin 3D printing filament according to claim 1 , having a void rate of 5% or less.
3. The fiber-reinforced thermoplastic resin 3D printing filament according to claim 1 , having a flexural rigidity of 1 N·m 2 or less.
4. The fiber-reinforced thermoplastic resin 3D printing filament according to claim 1 , wherein the reinforcing fiber is made of at least one selected from a group consisting of a carbon fiber, a glass fiber and an aramid fiber.
5. The fiber-reinforced thermoplastic resin 3D printing filament according to claim 1 , wherein the thermoplastic resin is made of at least one selected from a group consisting of polyphenylene sulfide resin (PPS), polyarylene ether ketone resin (PAEK), polyetherimide resin (PEI), polyether sulfone resin (PES) and a liquid crystalline polymer resin (LCP).
6. The fiber-reinforced thermoplastic resin 3D printing filament according to claim 1 , wherein the reinforcing fiber has 90% or more of an average value D of a dispersion parameter d calculated by steps (i) to (iv):
(i) taking an image of a cross section of the fiber-reinforced thermoplastic resin filament perpendicular to an orientation direction;
(ii) dividing the image of the cross section into square units having a side length t within a range of Formula (1);
(iii) calculating the dispersion parameter d by Formula (2);
(iv) calculating the average value D of the dispersion parameter d by repeating a plurality of sets of steps (i) to (iii),
1.5 a≤t≤ 2.5 a (1), where:
a: fiber diameter; and
t: side length of unit,
Dispersion parameter d =100×(the number of units including reinforcing fibers within range)/(the number of all units) (2).
7. The fiber-reinforced thermoplastic resin 3D printing filament according to claim 1 , wherein the average value D of the dispersion parameter d has 4% or more of a coefficient of variance.
8. The fiber-reinforced thermoplastic resin 3D printing filament according to claim 1 , further comprising an outer most layer coated with the thermoplastic resin.
9. A shaped product, comprising the fiber-reinforced thermoplastic resin 3D printing filament according to claim 1 .