US 12,275,207 B2
Method for producing long-fiber composite
Jae Shik Lee, Cheongju-si (KR)
Assigned to SOONCHUNHYANG UNIVERSITY INDUSTRY ACADEMY COOPERATION FOUNDATION, Asan-si (KR)
Appl. No. 17/627,922
Filed by SOONCHUNHYANG UNIVERSITY INDUSTRY ACADEMY COOPERATION FOUNDATION, Chungcheongnam-do (KR)
PCT Filed Jul. 16, 2020, PCT No. PCT/KR2020/009396
§ 371(c)(1), (2) Date Jan. 18, 2022,
PCT Pub. No. WO2021/010775, PCT Pub. Date Jan. 21, 2021.
Claims priority of application No. 10-2019-0086702 (KR), filed on Jul. 18, 2019.
Prior Publication US 2022/0266551 A1, Aug. 25, 2022
Int. Cl. B29C 70/00 (2006.01); B29B 15/00 (2006.01); B29C 70/28 (2006.01); B29C 70/50 (2006.01); B29C 70/52 (2006.01); B29C 70/54 (2006.01); B29C 70/68 (2006.01); B29C 70/78 (2006.01); C08J 5/00 (2006.01); C08J 5/10 (2006.01); B29K 105/04 (2006.01); B29K 105/10 (2006.01)
CPC B29C 70/682 (2013.01) [B29C 70/504 (2013.01); B29C 70/54 (2013.01); B29K 2105/04 (2013.01); B29K 2105/10 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for manufacturing a long fiber composite using an apparatus for manufacturing a long fiber composite, the apparatus including a container for containing a resin, a roller which is disposed inside the container and rotates in one direction, a draw-out part for applying a tension to a fiber bundle and moving the fiber bundle in one direction wherein the fiber bundle has porosity, and a resin supply part which is connected to bottom of the container and for supplying the resin into the container,
wherein the roller includes a first roller and a second roller which are spaced apart from each other,
the method comprising the steps of:
a supply step of supplying the resin from the bottom of the container upwardly into the container at a preset pressure by the resin supply part;
a moving step of moving the fiber bundle positioned on the roller in one direction by the draw-out part; and
an impregnation step of penetrating the resin supplied into the container into the porosity of the fiber bundle wherein the resin is pulled up to the fiber bundle located on the first roller and the second roller by rotation of the first roller and the second roller so that the resin is penetrated into the fiber bundle,
wherein the fiber bundle is partially impregnated with only one surface in contact with the resin by controlling an amount of the resin penetrated by the first roller,
wherein penetration pressure is 0.3 to 5.5 atmospheric pressures (atm),
wherein the resin is a non-Newtonian resin having a power law index of 0.25 to 0.92, and
wherein the impregnation step is controlled according to the following Equation 1:

OG Complex Work Unit Math
wherein Vo: average velocity of the resin penetrated into the fiber bundle, n: power law index of the resin, Ky: transverse permeability, μeff: effective viscosity, ΔP: penetration pressure of the resin into the fiber bundle, and L: thickness of the fiber bundle, which is a distance between one surface of the fiber bundle and the other surface thereof.