In-plant regrind

The resin supply system should be designed to take advantage of the raw materials in the lowest cost and most effective form. Additives tend to be more expensive than the base resin. Gravimetric rather than volumetric supply of the material is more conducive to minimizing the use of the more expensive feedstock components. The ability of the equipment to utilize reliably 100% of in-plant regrind, additive concentrates, and recycled materials is one of the most important factors to be considered. 

In the material chain of the automotive industry two streams of different plastics have been identified in-plant regrind, or off-specification products, and "post-consumer" materials. The former can be taken care of within the processing community itself. The latter will most likely be the responsibility of... 

Within the field of engineering thermoplastics, in-plant recycling has only recently been adopted due to stringent performance specifications. There are no general guidelines on maximum regrind content. Feasible levels depend on the application requirements and on material characteristics. 

There is a wide variety of granulator sizes and designs. Regrind is usually produced in centrally located machines, the sizes and capacities of which are adapted to the respective plant. However, it is also possible for each injection molding machine to be equipped with a small auxiliary granulator. This obviates the transportation of the waste and prevents accidental mix-up of different plasties grades to the greatest possible extent. 

Recycle ( )re- sl-k9l (1926) n, v. (1) (regrind) In a processing plant, to recover trim scrap and faulty parts by granulating... 

In any extrusion blow-molding process, there is off-fall or trim that has to be reclaimed. How a production plant handles their off-fall or trim can make a difference as to profit or loss. Use of regrind, as well as the use of color additives and lubricants, will have a major effect on parisons repeatability. 

---