Apparatus and method for melt spinning dyed yarn filaments
First Claim
1. An apparatus for melt spinning dyed polymeric filaments comprising a melt producer for producing an undyed polymer melt and delivering the melt serially to a metering device for adding a liquid dye, a mixing unit for mixing the liquid dye and the melt, and then to a spin unit where the dyed melt is extruded into filaments, and wherein said mixing unit comprises at least one static mixer and at least one dynamic mixer.
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Accused Products
Abstract
An apparatus and a method for spinning dyed filaments from a dyed polymer melt, wherein an undyed polymer melt is produced by a melt producer. A liquid dye is added to the polymer melt by means of a dye metering device. To mix the liquid dye and dye the polymer melt, a mixing unit is provided. The dyed polymer is then spun to filaments by means of a spin unit. To obtain before the spinning step a uniform coloration of the polymer melt despite the short dwelling time of the liquid dye in the polymer melt, the liquid dye and the polymer melt are mixed in a plurality of successive mixing units which are formed by a mixer combination comprising at least one static mixer and at least one dynamic mixer.
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Citations
13 Claims
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1. An apparatus for melt spinning dyed polymeric filaments comprising
a melt producer for producing an undyed polymer melt and delivering the melt serially to a metering device for adding a liquid dye, a mixing unit for mixing the liquid dye and the melt, and then to a spin unit where the dyed melt is extruded into filaments, and wherein said mixing unit comprises at least one static mixer and at least one dynamic mixer.
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9. A method for melt spinning dyed polymeric filaments comprising the steps of
extruding an undyed polymeric melt and advancing the melt to a spin unit, adding a liquid dye to the advancing melt, mixing the liquid dye and the advancing melt, spinning the dyed and mixed advancing melt into polymeric filaments in the spin unit, and wherein the mixing step comprises a plurality of successive mixing operations, with a static mixing occurring in at least one mixing operation and a dynamic mixing occurring in another mixing operation.
Specification