Recycling compatible materials

Some parts such as dashboards are an inextricable combination of various subparts of different materials making it impossible to dismantle. The choice of compatible materials is advised to allow recycling. For example, a part can be made out of several olefin subparts ... 

The storage requirements for lithium batteries are very similar to those of other batteries. They should be kept out of direct sunlight or high heat. They should be kept covered and clearly marked. In a recycling environment safeguards must be taken to reduce the risk of fire. All combustible material that is not essential should be removed from the area. Batteries should not be stored near explosives, flammable liquids or other non-compatible materials. The storage area should be made of metal or concrete... 

The incorporation of polyesters into interior applications is driven largely by its compatibility with other materials in the car such as upholstery and carpeting. As recycling is becoming increasingly important, trends toward the use of compatible materials such as these will undoubtedly advance. 

Often the desired functions cannot be provided with one single material, and both material selection and iissembly become crucial for successful recycling of the product. If two materials are to be assembled by means of an irreversible bond, such as welding or an adhesive, it is important to select both compatible materials and a compatible adhesive to avoid an unnecessary drop in material quality upon recycling (see Figure 5.14 "poor assembl) )-... 

Recycled plastic material of this composition was used for the manufacture of flower pots at Hackman Household AB in Gislaved, Sweden, a company which had previously shown great interest in receiving recycled-polypropylene compatible materials. The collaboration between Pharmacia Upjohn and Hackman shows the importance of finding fruitful collaborative ventures in order to succeed in recycling processes. 

Environmental — Environmentally compatible production — Recyclable materials — DMFC afford future sustainable use of regenerative energy sources and are, from an ecological and economical point of view, a significant element in future methods of supplying humanity with sufficient energy — Eluorination still problematical... 

Material compatibility is therefore an important precondition for material recycling. Even in tiny quantities, impurities in the form of incompatible material types may reduce the quality of recyclates, or components containing recyclates, to such an extent that recycling is hindered or even prevented. VDl Guideline 2243 [5], for example, provides information on plastics engineering compatible with recycling processes. 

Obtaining pure-type plastics for recycling often involves significant effort and expenditure. In principle, however, material recycling is not impossible in such cases if the polymers in the mixture are compatible and miscible and can therefore be processed together. Compatibility matrices (Table 6) help assess the material compatibility of different plastic types in mixtures. 

An excellent example of a compatible system is the 1997 Buick Park Avenue bumper/fascia system. The fascia is a TPO material and the energy absorber is PP foam snap fit to the aluminum bumper beam. Signal markers and trim strips are also snap-fit for easy removal. Therefore, a large amount of compatible material can be quickly removed from it for recycling. There has been a trend toward molded-in-color fascias on certain types of vehicles. These not only reduce mass but also eliminate the environmental burdens associated with painting. Molded-in-color fascias have been used on a variety of small cars and some sport utility vehicles. 

Apple Computer has banned the use of various chemicals in its products, including PB-DEs. It prohibits any PVC parts or packaging of more than 25 g, except for closures for cables and wires. Several of its computers use recyclable polycarbonate for the enclosure. Large mechanical plastic parts are made of a single material or of compatible materials and marked with resin identification codes to facilitate recycling. ... 

Energetical utilization, i.e. direct incineration of plastics waste has the disadvantage of the higher environmental impact in comparison to the incineration of oil or gas from raw-material recycling processes. Every step to higher environmental compatibility of incineration decreases its energetical usability and is coupled with an appropriate increase of costs. 

New developments in polyolefin-based materials have created a family of polypropylene products with a wide range of physical properties, including the ability to be easily recycled. When utilized by automotive and product designers as a part of a design for disassembly strategy, these compatible materials will vield large sub-assemblies that can be reclaimed with a minimum of handling. 

Recycled poly(ethylene terephthalate) (PET), which offers excellent properties at potentially lower cost, is finding wider use as a raw material component and meeting increasing demands for environmentally compatible resins (see POLYESTERS,THERMOPLASTIC Recycling, PLASTICS). 

This paper discusses in depth advanced technologies for recycled materials from solid waste streams. Chemical depolymerisation, thermal depolymerisation, pyrolytic liquefaction, pyrolytic gasification, partial oxidation, and feedstock compatibility are all explained. The economic feasibility of the methods are considered. 

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