US 11,834,294 B2
Wound body and method for manufacturing wound body
Asami Nakai, Gifu (JP); Masataka Kaji, Kahoku (JP); Mitsuro Takagi, Kahoku (JP); Toshihiro Motochika, Kahoku (JP); and Nobuhiko Matsumoto, Hiratsuka (JP)
Assigned to Mitsubishi Gas Chemical Company, Inc., Tokyo (JP)
Appl. No. 17/272,889
Filed by Mitsubishi Gas Chemical Company, Inc., Tokyo (JP)
PCT Filed Aug. 30, 2019, PCT No. PCT/JP2019/034047
§ 371(c)(1), (2) Date Mar. 2, 2021,
PCT Pub. No. WO2020/050156, PCT Pub. Date Mar. 12, 2020.
Claims priority of application No. 2018-164476 (JP), filed on Sep. 3, 2018.
Prior Publication US 2021/0316956 A1, Oct. 14, 2021
Int. Cl. B65H 55/04 (2006.01)
CPC B65H 55/04 (2013.01) [B65H 2701/313 (2013.01); B65H 2701/37 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A wound body comprising a core member and a commingled yarn traversely wound onto the core member; wherein
the commingled yarn is traversely wound such that a gap is present between the commingled yarn and a closest commingled yarn traversely wound in the same direction;
the commingled yarn is constituted from continuous reinforcing fibers and continuous thermoplastic resin fibers;
a dispersion degree of the continuous reinforcing fibers in the continuous thermoplastic resin fibers is 90% or more;
an impregnation rate of the continuous thermoplastic resin fibers in the continuous reinforcing fibers is 5% or less;
the commingled yarn is traversely wound in two to four directions;
the commingled yarn is traversely wound in at least a direction from 3 to 25° and a direction from −3 to −25°, with respect to a straight line orthogonal to a center axis of the core member;
a ratio of a moved distance/width of commingled yarn, which is a ratio of a distance at which the commingled yarn is moved with regard to a central portion in the center axis direction of the core member when the commingled yarn has been traversely wound one turn around the core member, to a width of the commingled yarn, is from 2.0 to 12.0;
the commingled yarn is non-twisted and in a tape shape with a width from 7 to 20 mm;
a ratio of a width of traverse winding/width of commingled yarn, which is a ratio of a width at which the commingled yarn is wound onto the core member to a width of the commingled yarn, is from 15 to 40; and
a diameter of the core member is from 5 to 20 cm;
where the dispersion degree is defined as a value that is obtained by embedding the commingled yarn in an epoxy resin, grinding a cross section perpendicular to a longitudinal direction of the embedded commingled yarn, photographing a cross-sectional view using an ultra-deep color 3D shape measuring microscope, drawing six equidistantly spaced auxiliary lines in a radial shape in the captured image, measuring lengths of continuous reinforcing fiber regions on each of the auxiliary lines as a1, a2, a3, . . . ai (i=n), measuring lengths of continuous thermoplastic resin fiber regions on each of auxiliary lines as b1, b2, b3, . . . bi (i=m), and then calculating the dispersion degree from the following equation:

OG Complex Work Unit Math
and the impregnation rate is defined as a ratio at which the continuous thermoplastic resin fibers are impregnated into the continuous reinforcing fibers, and is a value expressed based on a ratio of a surface area of a cross section perpendicular to the longitudinal direction of the impregnated continuous thermoplastic resin fibers with respect to a surface area of a cross section perpendicular to the longitudinal direction of the commingled yarn.