Film scrap

Freeman Chemical uses about 25 million lb of postconsumer PET bottles and film scrap to make polyols for the production of rigid foams. The company estimates that more than 50% of the laminate foam insulation used for construction is made from recycled material. 

PE mixed film scrap film extrusion, rotomolding Zahavich and... 

Either PA-6 or PA-6,66, was blended with 1-50 wt% of a PA/LDPE laminated film scrap. As a compatibilizer, either an ethylene-acrylic acid-r-alkyl acrylate, ethylene-glycidyl acrylate, allyl glycidyl ether-t-alkyl acrylate, ethylene-acrylic acid (or ester)-MA, or EMA, was used. 

Silver recovery makes PET-base recovery more economical. In a typical way of operation, PET film recycling is thus coupled with the simultaneous recovery of silver, for example, by washing with NaOH and follow-up treatment. PET-recycling by direct reuse, if the washed PET-film scrap is clean enough to be recovered by direct reextrusion, is by far the most economical process. However, this process is most suited for the recovery of in-production wastes. For customer-recollected PET-film, which may have a higher degree of contamination, other technologies are to he apphed. 

Among the factors to be considered when ordering from a supplier of laboratory chemicals is whether the supplier will accept return of unopened chemicals, including highly reactive chemicals. Materials other than chemicals, such as containers or packaging materials and parts of laboratory instruments, can also be recycled. Examples include certain glass and plastic containers, drums and pads, plastic scrap and film scrap, cardboard, office paper, circuit boards, and metals such as steel and aluminum. 

Perhaps the single most important objective for any blown film extrusion operator is to produce film that meets thickness specification. Many resources are devoted to ensuring that thickness measurements are in-specification across the film web and remain so throughout a production run. Variations in thickness can lead to product failure, downtime of conversion machinery, and large amounts of film scrap. Also, large thickness variations can significantly reduce profits through excessive material consumption. 

Innovative Plastic Products P.O. Box 898 Industrial scrap Greensboro, GA 30642 (404) 453-7552 Accepts only packaging and film scrap from industry full start-up in early 1991... 

An alternative to the foregoing process, which uses only physical methods of purification, is chemical recycling. Large amounts of PET film scrap are salvaged by a transesterification reaction. The scrap is treated with methanol in the presence of an acid catalyst to give ethylene glycol and dimethyl terephthalate, monomers that are purified by distillation or recrystallization and used as feedstocks for the production of more... 

Sion. Low bulk density materials (Pb < 0.2 g/cc) tend to cause solids conveying problems, either in the feed hopper or in the feed section of the extruder. Materials with irregularly shaped particles tend to have a low bulk density examples are fiber scrap or film scrap (flakes). When the bulk density is low, the mass flow rate will be low as well. Thus, the solids conveying rate may be insufficient to supply the downstream zones (plasticating and melt conveying) with enough material. Special devices and special extruders have been designed to deal with these low bulk density materials. A crammer feeder, as shown in Fig. 6.1, is a device used to improve the solids transport from the feed hopper into the extruder barrel. 

Alloying PET and PE doesn t make economic sense if you start with vPET, but it pays off as a use for inexpensive waste streams like coloured PET and barrier PET film scrap, which normally only find low-value applications or are thrown away. Combining PET and PE can yield unusual properties. The alloys are less brittle than... 

Large amounts of film scrap are available, because of the short lifetime associated with packaging and industrial film materials such as carrier bags, dustbin liners and plastic sacks. A typical lifetime of products of this type is only two years. 

In the first step of the process, photographic emulsion layers containing silver are washed with, for example, NaOH, and after separation, silver is recovered on one side, and cleaned PET-waste on the other side. Important in this process is that the washed PET-film scrap is clean enough to be recovered by direct re-extrusion, although careful analysis remains necessary. 

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