ABS Processing and forming of plastics, ABS (acrylonitrile-butadiene-styrene)
Producing of plastic made items can be done using different techniques.
- Die casting;
- Parent sheet products forming;
Anyway when plastic made items are produced there are same processes:
- Heating and melting of raw materials (grains);
- Composition blending , vacuumizing;
- High-pressure casting into fitment or forming of plate stock.
- Workpiece cooling;
- Items hot molding (for plate stock);
- Workpiece mechanical operating;
In every production stage described above working zone air and ventilating emissions pollution by different substances is occurring:
- Dust and aerosols (smokes). Generated while finished goods are mechanically operated.
- Plasticizer and processing aid fumes and aerosol
- Sterol fumes (for example ABS plastic’s) or other monomer. Heating, vacuumizing and forming emission.
- Solvents fumes. Generated while finished goods processed and painted.
Most harmful and hard-to-remove in this list of pollutions are sterol and different solvents fumes. In industry producing items from polymeric material concentration of sterol and solvents in ventilating emissions reach 500mg/m3 of air.
Sterol (Vinylbenzene, Phenylethylene, Ethenylbenzene) C8H8/C6H5CH=CH2
Class of danger: 2;
Limiting harmfulness rate: reflective-resorptive;
MPC one time maximal: 0,04 mg/m3
MPC average daily: 0,002 mg/m3
Working area guideline, USA: TLV (threshold limit value): 50 ppm; 213 mg/m3
STEL (Short term exposure limit, not more 15 minutes, no often than 4 times during a shift): 100 ppm; 426 mg/m3)
Sterol irritates eyes, skin and respiratory tracts. Swallowing of liquid or inhalation of fumes can cause aspiration in lungs with risk of chemical pneumonia. Influence can cause loss of consciousness. Repeated or continuous contact with skin can cause dermatitis and sensitizing of skin. Repeated or continuous contact can cause asthma. Substance influences to central nervous system. Substance is carcinogenic forhuman.
Sterol monomer and solvents fumes can be removed from a working zone and fabrication facilities using exhaust ventilation and release into the atmosphere. But in that case two main difficulties appear:
- Necessity to heat and fan incoming air in rooms.
- Government limitation to release of harmful substances into atmosphere.
So many item manufacturers faced with the task to clean ventilating emissions and working area air from sterol monomer and solvents fumes.
Now available several technologies of cleaning air from sterol: absorbing (activated carbon), scrubbers (liquid absorption), biological cleaning, reburning, catalytic, photocatalytic and gas-discharge-catalytic. All these technologies have positive and negative sides.
”Ecopromika” company Ltd worked out and produce special equipment complex for cleaning air from sterol and solvents fumes – “Gasconvertor “Yatagan”. For today these type of equipment has the best “cost-quality” and “efficiency-dimensions” performance, practically doesn’t have replaceable parts, doesn’t need wastes utilization and has lowest cost of operation. “Gasconvertor “Yatagan” installations sterol cleaning efficiency confirmed by many tests on a stand in laboratory environment and operating enterprises.
Rest on field experience of “Gasconvertor “Yatagan” on a different enterprises, related to fiberglass plastic and composite materials production we recommend:
- To clean ventilating emissions from sterol monomer and solvents fumes use“Gasconvertor “Yatagan X,X – 2000” installations;
- To clean air in recycling ventilating systems use “Gasconvertor “Yatagan X,X -200R” or “Gasconvertor “YataganX,X -2000R”.