Recycling plastic bottles - the second life of a polyethylene terephthalate (PET)

Recycling plastic bottles - one of the directions of use of recycled materials for the renewal of the resource base of polymeric materials.When processing is the problem of waste disposal, and the obtained materials that can be re-directed to the production, even with some constraints (processing, sanitary, legislative, health) associated with repeated use of polymers.

Because polyethylene terephthalate (PET) is sufficiently stable mechanical properties, processing of plastic bottles out of it - the most mature and well-established way of using recycled polymer.There are two basic types of processing - mechanical and chemical.Typically, in most cases, recycling of PET bottles is carried out mechanically, as by chemical increased requirements to raw materials and requires the use of expensive catalysts.In mechanical lamination process does not require disposal.PET bottles, first sort out from other types of packaging polymer (polyethylene, PVC) and extraneous things (tubes, garbage).Depending on the requirements for the final product of the bottle can sort by color and even the type of polymer.

initial processing of plastic bottles going to the knife grinder, where as a result of technological redistribution produced PET particles 0.5-10 mm.The resulting polymer crumb was washed with a solution of caustic soda and water, after which it was dried on a particular technology, with humidity of 0.02-0.05% and a temperature of 130 ° C.The drying process is important, failure of required parameters for moisture leads to irreversible deterioration recycled.

After drying, agglomeration is made of material which is produced as a result of sintering the obtained in the previous stages of technology crumbs into small lumps.At this stage of processing plastic bottles can be completed, as has the agglomerate can be used as a raw material.In order to average the physical characteristics of secondary raw materials, produce its granulation.As a result, it processed PET particles become denser, and the resulting material is easier to use and later to obtain the necessary materials on standard equipment.The main areas of use of raw materials of PET waste is the production of films, fibers and bottles.Typically, given the mechanical and rheological (flow of material) properties of the recycled PET is used to produce containers for various chemicals.As a container for food products recycled PET is used.Fibre recycled PET often processed into a base fabric for the manufacture of carpets and garments or textiles.Secondary raw materials are also on the production of geotextiles, padding polyester, noise insulation materials, absorb and filter elements, electrical products, accessories (by injection), automotive parts.