초록 ▼

Apparatus for and methods of extruding tubular plastic netting from extrusion orifices in concentric, counterrotatable inner and outer dies in which the plastic filaments extruded therefrom have substantially the same downward relative velocity so as to form netting intersections with substantially

Apparatus for and methods of extruding tubular plastic netting from extrusion orifices in concentric, counterrotatable inner and outer dies in which the plastic filaments extruded therefrom have substantially the same downward relative velocity so as to form netting intersections with substantially no relative shear movement between intersecting filaments.

대표청구항 ▼

Apparatus for extruding plastic netting comprised concentric inner and outer dies, the outer die having a central opening and the inner die having a rotary sealing fit in said opening, the inner die being rotatable in one direction and the outer die being rotatable in the opposite direction about a

Apparatus for extruding plastic netting comprised concentric inner and outer dies, the outer die having a central opening and the inner die having a rotary sealing fit in said opening, the inner die being rotatable in one direction and the outer die being rotatable in the opposite direction about a common die axis, each die having a circular series of extrusion passages for extrusion of filaments of plastic therethrough from one side of the die constituting its inside to the other side constituting its outside, the extrusion passages of the inner die having inner ends at said inside of the inner die spaced at intervals around a first circle lying generally in a plane perpendicular to said axis and having its center in said die axis, and having outer ends at said outside of the inner die spaced at intervals around a second circle lying generally in a plane perpendicular to said axis and having its center in said die axis, said second circle being larger than said first circle and said circles thereby defining a frustum of a first cone diverging in the direction toward the outside of the inner die, the extrusion passages of the outer die having inner ends at said inside of the inner die spaced at intervals around a third circle lying generally in a plane perpendicular to said axis and having its center in said die axis, and having outer ends at said outside of the inner die spaced at intervals around a fourth circle lying generally in a plane perpendicular to said axis and having its center in said die axis, said fourth circle being smaller than said third circle and said third and fourth circles thereby defining a frustum of a second cone converging in the direction toward the outside of the outer die, the extrusion passages of the inner die extending from said first circle to said second circle and thereby being angled outwardly away from said die axis, and also being inclined in one direction relative to the generatrices of said first cone and the extrusion passages of the outer die extending from said third circle to said fourth circle and thereby being angled inwardly toward said die axis, and also being inclined in the opposite direction relative to the generatrices of said second cone.