Nonwoven polyester filling

For the back belt, materials were selected to develop a strong and flexible product. The main properties of the chosen materials included flexibility, breathability, antistatic, hydrophUic and pleasant to the skin. For the first and second layers a cotton twUl material is used because this material is strong, breathable, antistatic and pleasant to the skin. Because of its properties, the material is used in the inner surface of the medical back belt where it is directly applied onto the skin. The third layer is a nonwoven polyester filling, which gives extra stability and comfort. As a fourth layer, cotton DreU material is used because of its outstanding strength and flexible properties. This material is often used in orthopaedic devices such as orthopaedic corsets and for temporary trunk orthosis because it can support and stabilize the parts of the body where it is applied. In the medical back belt it is applied in both sides of the product so that a straight posture can be achieved. Furthermore, PES tricot is used for more support and flexibility. Because of the combination of these four different materials, the stabilization and comfort can be realized by the back belt. 

Vankelecom et al. (1997a) studied three types of hydrophobic porous fillers (carbon blacks, in situ methylated silicas, and silylated silicas) incorporated in PDMS membranes in order to find out under which conditions these membranes were advantageous for PV of aqueous solutions. The properties of these fillers were changed systematically in order to maximize the fluxes and selectivities of the PV of aqueous EtOH, tert-hutyl alcohol (TEA), or aroma solution. The effect of incorporation of carbon black in PDMS for the PV of a 6 wt% alcohol solution in water is based on the level of the PDMS. When using PDMS membranes filled with hydrophobic silicas, the best results were obtained with silylated silicas. Vankelecom et al. (1997b) investigated the PV of aroma compounds using zeolite-filled PDMS composite membranes. Zeolite-filled PDMS membranes were supported on the PAN asymmetric membrane coated on a nonwoven polyester. Table 9.6 shows the influence of the filler on the fluxes and overall enrichment factors. 

They are fabricated from a variety of inorganic, organic, and naturally occurring materials and generally contain pores that are greater than 50—100 A in diameter. Materials such as nonwoven fibers (e.g. nylon, cotton, polyesters, glass), polymer films (e.g. polyethylene (PE), polypropylene (PP), poly(tetrafluo-roethylene) (PTFE), poly (vinyl chloride) (PVC)), and naturally occurring substances (e.g. rubber, asbestos, wood) have been used for microporous separators in batteries that operate at ambient and low temperatures (<100 °C). The microporous polyolefins (PP, PE, or laminates of PP and PE) are widely used in lithium based nonaqueous batteries (section 6.1), and filled polyethylene separators in lead-acid batteries (section 7.3), respectively. 

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