Patent ID: 11919255
Assignee: MITSUBISHI CHEMICAL CORPORATION
Field: Other special machines (Mechanical engineering)
Classification: CPC B  D | IPC B  D

Claim 0:
1. A method of manufacturing a sheet-type fiber-reinforced resin molding material comprising cut fiber bundles impregnated with a resin, comprising:
producing a separated continuous fiber bundle having separated portions and unseparated portions by intermittently separating a continuous fiber bundle with a moving blade structure,
cutting the separated continuous fiber bundle at intervals in a longitudinal direction to produce cut fiber bundles, and
impregnating the cut fiber bundles with the resin to produce the sheet-type fiber-reinforced resin molding material,
wherein, in the separated continuous fiber bundle, the separated portions and the unseparated portions alternate continuously in a direction along a length of the separated continuous fiber bundle,
wherein the moving blade structure includes a spacer member positioned between a plurality of blades such that the plurality of blades are placed with a predetermined interval along a width direction of the continuous fiber bundle, and
wherein the separated continuous fiber bundle satisfies a condition specified in formula (3):

0.9≤a/(a+b)<1  (3)

wherein
“a” is a length (millimeter) of the separated portion of the separated continuous fiber bundle, and, “b” is a length (millimeter) of the unseparated portion of the separated continuous fiber bundle.