Patent ID: 11946169
Assignee: PFNONWOVENS LLC
Field: Textile and paper machines (Mechanical engineering)
Classification: CPC D  B  Y | IPC B  D

Claim 13:
14. A process for making a spunmelt nonwoven batt on a spunmelt production line, comprising:
providing a mixture of recycled polypropylene;
melting the recycled polypropylene mixture to a polymer melt via extrusion;
filtering the polymer melt through a filter to form recycled polypropylene filtrate;
forming recycled polypropylene by solidifying the recycled polypropylene filtrate having a melt flow rate within a range of 30 g/10 min to 100 g/10 min as tested in accordance with ASTM 1238;
dosing the recycled polypropylene into the spunmelt production line by an amount of 100% by weight and melting the dosed recycled polypropylene;
passing the dosed recycled polypropylene through at least one filter within the spunmelt production line, a ratio of the mesh of the filter used in the step of filtering the polymer melt to the mesh of a finest filter of the at least the one filter used in the spunmelt production line being at least 1.1;
passing the recycled polypropylene through a spinneret of the spunmelt production line to form filaments at a spinning speed of greater than 1200 meters per minute, the formed filaments being monocomponent, bicomponent or multicomponent filaments, all polypropylene components of the filaments comprising 100% by weight recycled polypropylene;
cooling and drawing the filaments; and
depositing the filaments on a moving belt to form a nonwoven batt made up of fibers comprising 100% by weight recycled polypropylene.