Assembly to feed additives into a molten polymer flow, for preoriented yarn melt spinning, has a planet wheel pump with planet wheels fitted with feed outflows and selective connections to additives/polymer inflows

摘要

The assembly to feed additives into a flow of molten polymers has a channel as a flow passage for the molten polymer, and a planet wheel pump for a dosed feed of additives. The pump has at least three planet wheels, each with a feed channel (18) for the delivery of a polymer or additive, and an outflow channel (19). At least two feed channels (18'-18') can be linked selectively to an inflow (24) for a polymer or an additive, or connected in a flow link to the polymer passage channel. The change in the mixture ratios is through a valve body (2), where two housing sections (20,21) are screwed together in different settings. A unit to stop the polymer flow uses compressed air to solidify the molten polymer.