Freudenberg (United States)

This article investigates melt spinning of polypropylene (PP) with high-density polyethylene (HDPE) and linear low-density polyethylene (LLDPE) blend fibers at different compositions, as well as the effects of HDPE and LLDPE on the bonding ability of blend fibers in thermal bonding process at different temperatures have been studied. HDPE and LLDPE were added to PP at 3, 5, 7, and 10 wt% to measure the upper threshold of such blends. While HDPE was added up to 7 wt%, PP/LLDPE blend fibers were only spun up to 3 wt% of LLDPE. Differential scanning calorimetry (DSC) revealed that increasing both HDPE and LLDPE contents lead to higher crystallinity values due to polyethylenes nucleating effect on PP. By adding HDPE and LLDPE, the tensile strength of blend fibers before and after bonding was decreased drastically compared to pure PP fibers. On the other hand, the addition of HDPE to PP and increasing bonding temperature enhanced bonding strength.

Il est rare qu’un poete tibetain contemporain vivant en Chine se fraie une voie jusqu’a la scene litteraire mondiale. Grâce a l’anthologie Tibet’s True Heart, une partie de l’œuvre de Woeser (tib. ’Od zer, ch. Weise), ecrivain et intellectuelle tibetaine d’expression chinoise, est desormais accessible aux lecteurs occidentaux. Woeser n’est pas une inconnue : depuis la revolte tibetaine de 2008, sa notoriete en tant que militante a depasse celle de la poetesse. En effet, son blog, interdit en ...

Fiber crimp behavior is an important parameter for processing performance and product quality. In Part I, we quantified the mechanical behavior of a fiber during crimp removal based on load-extension data. A logarithmic function can be used to characterize the shape of the load-extension curve during crimp removal. Characteristic parameters for three different kinds of PET fibers are interpreted in terms of crimp processing settings and correlated with processing performance during carding.