METHOD FOR FIBROUS BLANK MANUFACTURING Russian patent published in 2017 - IPC B29B11/16 B29C70/54 

FIELD: technological processes.

SUBSTANCE: method for manufacturing a fibrous blank by laying bundles of reinforcing fibers on a surface and/or bundles of reinforcing fibers layed on surface includes a stage for supplying endless reinforcing fiber bundle in the form of ribbon-shaped tow and provided with a binder from a feeder to a laying head, and said ribbon-shaped tow having tow width of at least 5 mm and binder concentration in the range of 2 to 70 wt % relative to the weight of the ribbon-shaped tow. Spreading of the endless ribbon-shaped tow in a spreading unit located on the laying head and transporting the tow to the transportation direction by means of a first transportation device arranged on the laying head to a longitudinal separation device located on the laying head. When the tow is stabilised in a direction transverse to the transportation direction, the tow is cut in the longitudinal separation device along its longitudinal extension by means of a dividing element into two or more pieces of the tow. Transportation of the tow pieces in the transportation direction by means of a second transport device located on the laying head to the transverse separation unit located on the laying head. The tow pieces are cut by means of a lateral separation unit into bundles of reinforcing fibers of a certain length. The bundles of reinforcing fibers are stacked on the surface and/or on bundles of reinforcing fibers laid on the surface and secured to form the fibrous blank. At that, a relative movement for laying is set between the laying head and the surface.

EFFECT: increase of fiber volume fraction in fibrous blanks.

18 cl, 3 dwg