Recycled products, performance

When RPs are granulated, the lengths of the fibers are reduced. On reprocessing with virgin materials or alone, their processability and product performances are definitely change. So it is important to determine if the change will affect final product performances. If it will, a limit for the amount of regrind mix should be determined or no recycled RP is to be used. Use it in some other product such as simulated wood. 

Kubo I, Nakatsu T (1990) Recent Examples of Preparative-Scale Recycling High Performance Liquid Chromatography in Natural Products Chemistry. LC-GC 8 933... 

Kubo, I. and Nakatsu, T. (1991) Recent examples of preparative-scale recycling high performance liquid chromatogr hy m natural products chemistiy. LC/GC Int. 4,37-42. 

Customer preferences for recycled products have encouraged a more efficient use of wood and natural fibers. One potential approach to preserve wood and use natural fibers is the development of commodity-engineered composites that blend wood and natural fibers with other materials, such as plastic. The idea of combining wood and plastic is to produce a product with performance characteristics that combine the positive attributes of both materials. Wood and other natural fibers have been used as fillers and/or reinforcement to improve the mechanical properties of a variety of products. The combination of wood and plastic creates the ability to develop diverse products using many different manufacturing processes. 

The most interesting variant on the basic thermochemical liquefaction process involves the addition of an overpressure of carbon monoxide and hydrogen to the reaction, which is also performed in a non-aqueous solvent (anthracene oil or recycled product oil). Yields of oil up to 70% of the weight of the Douglas fir wood feedstock have been reported in an investigation by Elliott (4-8), Elliott and Walkup ( and Elliott and Giacoletto (10). This process variant (also known as the Albany, PERC, or CO-Steam Process) is described in more detail in the Results and Discussion section. 

A designer sometimes has an opportunity to use a material that provides no problem in the solid-waste stream or to use a design that lets lower-cost recycled plastics be used. In fact, blends of virgin (not previously processed) plastics with recycled plastics could permit the meeting of required product performance requirements. This approach has been used for the past century. However, the designer must take into account the possible lower performances that will occur with recycled plastics (Chapter 3). 

Viera [40] has discussed the reuse of the waste produced from edge trimming in the extrusion of TPO sheets and final inspection of TPO skin/crosslinked PE (XLPE) foam laminates. Different analysis techniques were used to evaluate the effects of the recyclate on the final product performance. The DMA results show no significant... 

Since basic equilibria, kinetic and fixed-bed data of sorption of nCs and nCe in pellets of 5A zeolite were obtained, we are able to simulate a cyclic PSA process for the separation of n/iso-paraffins. The case selected is the patent data shown by Minkkinen et al. [3]. In such process, isomerisation of Cs/Ce normal paraffins with recycling of normal paraffins is described. The recycling is performed in a selective adsorption containing 38Kg of 5A zeolite pellets. In the selective adsorption (lenght=4m i.d=12.7cm) unit a PSA cycle takes place at 300°C. Adsorption phase occurs at a total pressure of 15 bars with a duration of 6 minutes. Desorption phase is performed in 6 minutes at 2 bars countercurrent to adsorption with a fraction of the iCs rich product. To obtain continuous operation two columns are used. The effluent of the isomerisation reactor contains approximately 13.9 mole % nCs and 4.6 mole % nCo. The performance of the unit... 

In the case where the same enterprise performs collection, transportation, and intermediate treatment of discarded tires, as well as distribution of fuel chips derived from discarded tires to paper and steel mills as thermal recycling, the enterprise must be engaged in the area of reverse logistics as well as of forward logistics, including storage and distribution of the recycled products. 

This overview includes information and positive actions being now taken to provide solutions that will affect all materials. Because plastics usually receive the biggest emphasis, they are the main focus here. Plastics as well as other materials must all definitely be seen as problems (see Table 12-2). Practically all plastics can be made recyclable, incinerable, or degradable, but the conflict of product-performance requirements as against economics in most past applications has prevented these factors from being viable. Actions have thus been taken by the plastics industry here and abroad to make positive steps toward helping to reduce plastics waste by recycling, incineration, and so on. 

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