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Chemicals and Plastics

​Donaldson® Torit® offers multiple collectors and many construction and filter options to allow a collector selection to fit the diversity of chemical processes.
HomeApplicationsChemicals and Plastics

Chemicals and Plastics

 

​The chemical industry is large and diverse, and while much of it is liquid, dry products and by products are common. Dust results from processes such as material handling, screening, mixing, etc.

The plastics and resins industry is unique in the chemical industry. There are two broad classifications of plastics: thermoplastic resins produced by addition polymerization processes, and thermosetting resins made by condensation polymerization processes. Thermoplastic resins may be remolded with the addition of heat and thermosetting resins can't.

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​Model: DLMC 3/4/15

Application: Exhaust of crushers, screens, elutriators and material handling

Dust: Plastic fines and fiberglass

Location: Illinois

Model: DFT 4-48

Application: Heat exchanger and incinerator cleaning

Location: Alabama​

Model: 2DF4

Application: Packaging Line

Location: South Carolina​

Model: Downflo II (DFT) 4-16

Application: Paint pigment mixers

Location: Australia​

Model: Downflo II (DFT) 4-32

Application: Plastics cutting

Location: Mexico​

​Model: Downflo Oval (DFO) 3-18

Application: Phenolic Resin Machining

Dust: Plastic

Location: West Virginia

Overview
Related Products
FAQs

​Introduction: chemicals

The word chemistry invokes a vision of a glass beaker with swirling liquid, but it is much more. Chemical processes are by their nature exacting; as a result, the characteristics of the dry products and the associated gas stream are usually well known, aiding in the selection of the appropriate dust collector.
special Process and Material Property Considerations
  • Corrosion
  • Humidity
  • pH
  • Cross Contamination
  • Toxicity
  • Combustibility and Explosivity
  

Introduction: Plastics

The plastics and resins industry is unique in the chemical industry. There are two broad classifications of plastics: thermoplastic resins produced by addition polymerization processes, and thermosetting resins made by condensation polymerization processes. Thermoplastic resins may be remolded with the addition of heat and thermosetting resins can't. The four areas of production are:
Resin Production
Primarily a wet process, dust control is still required on the crushing and screening as well as packaging or bulk handling.
Compounding
Various compounds added to the base resin enhance the plastics properties. Examples include fiberglass for strength, glass beads for weight reduction, colorants, oxidizers, etc. Dust created when handling these compounds prior to adding them to the resins offer a need for dust collection.
Thermosetting and Molding
These processes typically do not require dust collection, though other forms of emission control may be required.
Parts Cleaning
Many molded items come from the mold ready to use, requiring no additional processing. Others require grinding mold parting lines and/or blasting of the surface before they are ready for use. Many of these operations will require local exhaust ventilation systems and dust collection.
Machining and Grinding
Machining and grinding plastics offers special challenges for dust collectors because of static charge, and dust characteristics. Donaldson Torit collectors can meet those challenges. As an example, most eyeglass lenses are machined polycarbonate with each of the grinders requiring some form of dust control and Donaldson Torit has over 500 collectors installed on Polycarbonate lens grinding.
Plastic Recycling
Recycling conserves raw materials and energy and lowers the cost of production. Recycling has become a major objective of many industries and the plastics industry is a leading proponent, recycling everything from computer and copier cases to water bottles. In fact, in excess of 25% of water and soda bottles are recycled and over 1,600 businesses are involved in post consumer plastic recycling in the United States.
 
 

Special considerations

 
Plastic dust is a combustible material and those operations generating or handling plastic dust can require special mitigation efforts to minimize fire and explosion risks. Standards such as NFPA 654 can provide guidance for those who generate and handle these types of dusts. See the Donaldson Torit Dust Collectors and Combustible Dust Strategies brochure.
 
  • Static Charge Dissipation
    Plastic production, machining, and material handling can all lead to the development of a static charge on the plastic dust particles. These charges can lead to severe complications in any dust collection system unless addressed with proper bonding and grounding practices and procedures. Standards such as NFPA 77 can provide guidance for those who generate and handle these types of dusts.
  • Material Discharge Equipment
    Plastic production and material handling often involves large volumes of materials that nest and agglomerate at transfer points. Special consideration for dust discharge can be a critical factor in proper duct collector operation for many of these types of dusts.
  • Worker Productivity and Morale
    A dust-free manufacturing environment leads to greater productivity and accuracy, and contributes to worker satisfaction.
  • Reclaim Value
    Many plastic dusts, in sufficient production quantities, have intrinsic resale value in a secondary market.
 

LEGISLATION (OTHER FEDERAL AND LOCAL LEGISLATION MAY APPLY)

  • US EPA
  • Particulate Matter (PM):
    • PM 2.5 = 15 µg/m3 (annual), and 35 µg/m3 (24-hour)
    • PM 10 = 150 µg/m3 (24-hour)
    • National Emissions Standards for Hazardous Air Pollutants includes topics on Flexible Polyurethane Foam Fabrication Operations, Reinforced Plastic Composites Production, and Rubber Tire Manufacturing
  • OSHA Regulations
    • 29 CFR 1910.1000 - Air Contaminants
      NOTE: Twenty-five states, Puerto Rico and the Virgin Islands have OSHA-approved State Plans and have adopted their own standards and enforcement policies. For the most part, these States adopt standards that are identical to Federal OSHA. However, some States have adopted different standards applicable to this industry or may have different enforcement policies.
 

REFERENCES

 
Industrial Ventilation Manual
NIOSH Publication No. 76-179
WAC 296-818-500
 
What is a hydro-entanglement process?
What is a hydro-entanglement process?Instead of a mechanical process using needles to entangle and compress polyester fibers into a felt material, the hydro-entanglement process uses jets of water to entable and compree the polyester fibers into felt. The process creates a material that is more uniform and provides better filtration.See All FAQsClose Window
How are Dura-Life bags different from standard polyester bags?
How are Dura-Life bags different from standard polyester bags?Dura-Life bags are made from polyester material that is created through a hydro-entanglement process instead of a needle punch process. The hydro-entanglement process creates a more consistent and uniform filter material. The material is comparable in thickness to standard polyester, but weighs about 1/3 less. The fibers are smaller and the hydro-entanglement process creates a loftier and lighter weight fabric that filters more effectively.See All FAQsClose Window