Pellets virgin

Specification Washed Flake Upgraded pellets Virgin (typical)... 

Plastic, virgin A plastic material in the form of pellets, granules, powder, flock, liquid, etc. that has not been subjected to use or processing other than what was required for its initial manufacture. It is not recycled plastics. 

Further examples are furnished by the spectra of Figs. 10 and 11. A single pellet of virgin catalyst ( 7 x 10mm) was placed in a cell (Fig. 2) and degassed at room temperature, and spectrum S2 was recorded (the main spectral features are the strong absorptions of the kieselguhr support, but some sulfate absorptions can also be discerned). The catalyst was then exposed to 90 torr of SO2 at room temperature and spectrum was recorded with SO2 in the cell, when new features appeared. 

Table 4.3 Typical specifications for reclaimed flakes, recycled PET pellets and virgin PET pellets...

There are different types of plastics that are usually identified by their composition and/or performance. As an example there are virgin plastics. They are plastic materials that have not been subjected to any fabricating process. NEAT polymers identify plastics with Nothing Else Added To. They are true virgin polymers since they do not contain additives, fillers, etc. They are very rarely used. Plastic materials to be processed are in the form of pellets, granules, flakes, powders, flocks, liquids, etc. Of the 35,000 types available worldwide there are about 200 basic types or families that are commercially recognized with less than 20 that are popularly used. Examples of these plastics are shown in Table 1.1. 

Virgin resin in pellet form contains emulsifiers that give the pellet surface a thin, oily coating that acts to collect dust, preventing it from becoming airborne. Colorant and additive products also contain emulsifiers and/or lubricating waxes (especially when powdered resins are used) that also impart this property to the final product pellet. 

Virgin cellulose pellets and cellulose chars produced in the simulated fire apparatus were both examined. Two different measurements were made. One involved measuring the reflected radiation in the mid-infrared from 2.5 to 25 pro (4000 to 400 cm l). These measurements were performed in a diffuse reflectance cell within an FTIR spectrometer. These experiments revealed some wavelength dependence of refleclivity. Reflectance was also measured in-situ in the simulated fire apparatus, by arranging the samples, a fluxmeter. and the heating lamps such that surface reflection of (he incident radiation... 

Thermal diffusivity measurements were performed on pellets by the use of a transient response technique. Pellets of cellulose or char were instrumented with thermocouples at known distances from the surface. Samples were then brought into contact with a hotplate whose surface temperature varied in an approximately sinusoidal manner. Samples of virgin cellulose could only be tested up to surface temperatures of about 500 K, to avoid pyrolysis. Char samples could be tested to temperatures up to those seen during pyrolysis (in excess of 750 K). Samples were covered by a bell jar, purged with nitrogen, in order to avoid reactions with oxygen. 

After running on the press, the plate was removed without cleaning of the image, and measurements of contact angle made on the inked surface. The surface energies of the virgin ink were also determined by measurement of a series of dilutions in Bromonaphthalene and the contact angles on polyethylene pellets. The results are shown in Table 11. 

Catalyst pellets, x 3 in., with molybdena content from 6 to 15 % were used to reform a heavy virgin mixed naphtha with a research clear octane number of 39, a 240-430° F boiling range (ASTM), and a sulfur content near 0.1%. Pilot-plant studies were made at 488 to 530° and 250 psi. The feed rate was 1.0 volume of oil per volume of catalyst per hour and the hydrogen addition rate, 2500 SCF/Bbl. Activity and yield studies were made with the cogelled catalysts whereas activity determinations only were made on the impregnated catalysts. 

The use of virgin polyethylene as an additive to asphalt concrete is not new however, two new processes also use recycled plastic as an asphalt cement additive [ 146,147]. These latter two processes both use recycled low-density polyethylene resin, which is generally obtained from plastic trash and sandwich bags. The recycled plastic is made into pellets and added to asphalt cement at a rate of 4-7% by weight of binder [146-148]. 

---