Extrusion pack for sheath-core filaments

An extrustion pack for production of sheath-core filaments comprising:

• a stacked assemblege of a stream proportioning means, a stream conjugating means, and a spinneret means;
• said stream proportioning means having first supply channels for receiving and discharging a first polymer to form sheaths and second supply channels for receiving and discharging a second polymer to form cores;
• said stream conjugating means positioned adjacent said stream proportioning means has means defining upper and lower chambers, said upper chambers are connected to said first supply channels, contained within said upper chambers are upper sheath forming channels defined by the juncture of said stream conjugating means and said stream proportioning means, said upper sheat forming channels are connected to certain of said second supply channels so that sheath polymer can flow and encapsulate said core polymer, stream discharge passages essentially vertically aligned with said cartain of said second supply channels and connected to said upper sheath forming channels, said lower chambers have sheath passages connected to said first supply channels, contained within said lower chambers are lower sheath forming channels defined by the juncture of said stream conjugating means and said spinneret means, said lower sheath forming channels are connected to core passages essentially vertically aligned with certain other of said second supply channels for receiving core polymer so that sheath polymer can flow and encapsulate said core polymer, each said upper chamber is in fluid communication with a respective lower chamber through a passage connected to both chambers;
• and positioned adjacent said stream conjugating means is spinneret means having capillaries in communication and essentially vertically aligned with respective stream discharge passages and core passages.