Study on the Draw Resonance of Melt Spinning of Polypropylene/Polyethylene Blends

Öz

In the melt spinning process, quality and productivity of fibers are restricted by apreiodic uariation in fiber diameter during spinning, that is, the draw resonnnce due to the flow instability. Therefore, lots of studies have been carried out for the causes of draw resonance but very few papers were published for the traw resonance of the blend fibers. In this study, investigation was made for the effect of draw ratio and blend ratio on the draw resonance of the polypropylene (PP) and Polyethylene (PE) blend fibers, where PP has the high tendency of draw resonance and PE has low. Chips of PP and PE were melt blended by the twin screw blender in various blend ratios and two homopolymers. The blend chips were then melt spun in the lab melt spinning machine at various draw ratios from. 10 to 160. From the experimental results, it can be conculeded that the DmJDmin ratio increases as the draw ratio increases for each blend fibers and the critical draw ratio increases and DmJDmin decreases as the PE content in the blend fibers increases.  

Anahtar Kelimeler

• Study on the Draw
• Resonance
• Polypropylene

PP/PE Karışımlarının Eriyik Halde Çekimlerindeki Çekim Rezonansı Üzerine Bir Çalışma

Öz

Eriyik kalde lif gekinzin.de, liflcrin knlitcsi ve verilnlili& cekiln srrnsrnda lif copindaki periyodik degislnelerle sin.irlnn.zr, yam! gekim rezoncrnsl akzs karnrszzl~iyr ~zedeniylc o1lr.ymnktadrr. Bu. ~zedelzle ~~~~~~~~~~~~111 qogu celzim rezona~zszn I 17. mden lcri iizerilze ynpzlmzgtzr, fnkat kcrrr.yrn/ liflerin qekinz resonnnsr ile ilgili ol(riglenel)ilirli@ni, clarbe inukaveineti- qallgmalar yapllmlgtlr. ni ve cevresel geriliin qatlanla cliren- PE, nzatildi@Xla kahnlagan ve cini geligt.irmek ainaclyla aragtirma- ~ekilemeyen resonant bir mate~yal lar yaplmigtir. olarak bilinir, oysa PP nzatlldi@nCekim rezonansinin Miller tara- da incelen ve kolayllkla ~ekilebilen findau ilk kez gozlenmesinden [Mil- resonant bir matelyaldir. ler, 1963l sonra, bu rezonaiisln ozel- B11 makalede, PP/PE karlyinlalikleri I ~ck cnk polimer l~ili~iicisi verillin cekim rezonansi (~~VIXI~I+III I Tablo 1. PP ve LDPE'nin Grade ve ~zellikleri ve knnyln. ornn1nrrizi.n etkisi i/rw rnk qok as snyzda nzalmle yo~~r

Anahtar Kelimeler

• PP/PE
• Eriyik Halde
• Çekim Rezonansı