Process for making a polymeric fibrous material having increased beta content

摘要

A system and process for making a polymeric fibrous material having increased beta content is provided herein. The system is configured for meltblowing polymer into a fibrous material having high beta crystalline content and has an extruder for melting and moving a polymer to a meltblowing die. The meltblowing die has a longitudinally extending die tip with a plurality of spinnerets substantially equidistantly spaced from each other and a longitudinal fluid material flow through passage disposed along each longitudinal side of the die tip configured to axially attenuate the melted polymer from the die tip in fibrous form. A plurality of liquid spray nozzles are configured and disposed to spray a liquid into the fibrous melted polymer attenuated from the die tip.

主权项

1. A process for meltblowing polymer into a fibrous material having high beta crystalline content, the process comprising the steps of:
extruding and moving melted polymer to a meltblowing die; receiving the melted polymer from the extruder with a plurality of longitudinally extending die tips, each die tip having a spinneret; attenuating melted polymer axially from the plurality of spinnerets; flowing hot air through longitudinal fluid material flow through passages disposed along each longitudinal side of each die tip, contacting the melted polymer at the spinneret polymer outlet, and axially attenuating the melted polymer from each spinneret in fibrous form; spraying a liquid into the fibrous melted polymer immediately upon being attenuated from each die tip wherein a substantial amount of liquid being sprayed is at an angle between about 20° and about 85° toward the attenuation axis of the die tip; and collecting the fibers attenuated from each spinneret.