Filtering device and spinning head

A filtering device for a spinning head for manufacturing plastic threads, comprising:

• a housing for conveying plastic melt for discharge form spinnerets under pressure;
• an exchangeable filter element having filtering material through which the plastic melt flows, sealing edges at opposite ends thereof and a longitudinal axis, said filter element including a support pipe with built-in passages, said support pipe being surrounded by said filtering material, at least one of said sealing edges being flat and extending in a plane substantially perpendicular to said longitudinal axis;
• and
• a distributor device subjected to an axial pressing force dependent on strength or intensity of plastic melt pressure and applying such axial pressing force to said sealing edges of said filter element to close sealing gaps, said filter element having an overall rigidity such that under the axial pressing force the sealing gaps close due to elasticity of said filter element.

A spinning head for manufacturing plastic threads, comprising:

• a housing including a discharge side having a spinneret with a plurality of nozzle bores and including an inlet side having a control head with a melt inlet;
• a support installation mounted in said housing;
• a filter element between said control head and said spinneret, said filter element having first and second sealing edges on opposite ends thereof, said first sealing edge engaging a seal surface on said support installation, said filter element including an interior support pipe surrounded by and supporting filtering material, said support pipe having built-in passages;
• and
• a distributor device between said control head and said spinneret, said distributor device having a seal surface engaged by said second sealing edge of said filter element, having a pressure plate supported on said filter element and having a distributor head projecting into said filter element;
• whereby, the distributor device and the filter element are held together against said support installation by melt pressure, and plastic melt flows through said filtering material before being discharged from said spinneret and is conducted by said distributor head to said spinneret.