Abstract: The invention provides a process and apparatus for manufacturing flat plastic net. Tubular plastic net is made by extruding plastic material through coaxial circular counter-rotating die members to form a net structure having a plurality of crossing strands. The angular displacement of successive longitudinally-aligned junctions of the crossing strands is controlled, preferably by controlling the relative counter-rotation of the extrusion die members, and successive longitudinally aligned junctions are cut longitudinally within each junction. The tubular net so cut is opened out to form flat net.The flat net so produced, the edges of which are characterized by successive longitudinal edge junctions, in which each edge junction is cut longitudinally within the junction, is particularly useful for fencing material, for example.

Abstract: The invention provides a process and apparatus for manufacturing flat plastic net. Tubular plastic net is made by extruding plastic material through coaxial circular counter-rotating die members to form a net structure having a plurality of crossing strands. The angular displacement of successive longitudinally-aligned junctions of the crossing strands is controlled, preferably by controlling the relative counter-rotation of the extrusion die members, and successive longitudinally aligned junctions are cut longitudinally within each junction. The tubular net so cut is opened out to form flat net.The flat net so produced, the edges of which are characterized by successive longitudinal edge junctions, in which each edge junction is cut longitudinally within the junction, is particularly useful for fencing material, for example.

Abstract: A process for making a plastic pirn sleeve bearing rows of circumferential fine grooves having flush ends to prevent filament entangling is disclosed. The process involves indenting the external surface of a thermoplastic tube by adjusting the temperature of the external surface of the tube to a temperature above its softening point, rolling at least three die wheels each in a separate path along the length of the surface of the tube while the tube is supported on a mandrel and at the same time pressing the die wheels against the surface of the tube to form permanent indentations therein.