In modern recycling facilities, pneumatic conveying systems have become essential for moving materials efficiently. Among these, the plastic pneumatic conveying system equipment plays a critical role in transporting shredded plastic film and pellets between processing stations. One question that facility managers and operators frequently ask is: what is the actual noise level of this equipment, and how does it impact the workplace?
Typical Noise Levels of Plastic Pneumatic Conveying Systems
The noise level of plastic pneumatic conveying systems varies depending on system size, design, and operating conditions. In general, small-scale systems used in light industrial applications produce noise levels in the range of 70 to 80 decibels (dB). To put this in perspective, 70 dB is comparable to a busy office environment, while 80 dB matches the sound of a vacuum cleaner operating nearby.
Larger industrial systems, particularly those with high-capacity blowers and compressors, can generate noise levels of 90 dB or higher. At 90 dB, the sound intensity is similar to standing next to a lawn mower or motorcycle. Prolonged exposure to noise above 85 dB can cause permanent hearing damage, which is why occupational safety agencies such as OSHA set strict limits on workplace noise exposure.
For facilities using plastic pneumatic conveying system equipment in battery recycling plants, typical measurements show that well-designed systems operate between 65 and 75 dB when properly maintained and insulated. This range is considered safe for eight-hour work shifts without additional hearing protection.
Key Factors That Influence Noise Levels
Airflow Velocity and Turbulence
The primary source of noise in pneumatic conveying systems is high-velocity airflow. As air is forced through pipes to transport plastic materials, turbulence creates sound waves. Higher airflow velocities result in louder noise. Sharp bends, elbows, and sudden changes in pipe diameter disrupt smooth airflow, increasing turbulence and noise output. Systems designed with gradual bends and appropriately sized pipes experience significantly lower noise levels.
Equipment Components
Blowers and compressors are often the largest contributors to overall system noise. The mechanical operation of these components, including impeller rotation and air compression, produces substantial sound. Valves that open and close rapidly create pressure pulses that generate additional noise. The material being conveyed also matters. Plastic film and pellets are relatively soft compared to metal shavings, but they still create impact noise as they travel through pipes at high speed.
System Design and Installation
A properly designed system minimizes noise from the outset. Undersized pipes force air to move faster than necessary, increasing noise. Poor mounting that allows vibration to transfer to building structures can amplify perceived noise. Conversely, systems with proper sizing, vibration isolation, and acoustic insulation operate much more quietly. As a leading recycling equipment supplier, San Lan Technologies emphasizes optimized system design to keep noise levels within acceptable ranges.
How to Measure Noise Accurately
To assess the noise level of pneumatic conveying equipment accurately, facilities should use a calibrated sound level meter. This device measures sound intensity in decibels. Best practice requires taking readings at multiple points around the equipment: near the blower or compressor, at material discharge points, and at the operator's normal working position.
Multiple readings should be recorded over time to account for fluctuations in noise level caused by varying material loads and system cycles. Background noise should be measured before equipment startup and subtracted from operating measurements to obtain true equipment noise levels. Third-party acoustic consultants can provide detailed noise surveys for facilities requiring compliance documentation.
Practical Strategies for Noise Reduction
ｓｅｌｅｃｔ Low-Noise Equipment
When purchasing pneumatic conveying systems, compare noise specifications across manufacturers. Some blowers and compressors are engineered specifically for quiet operation, featuring improved impeller designs, precision-balanced rotating components, and factory-installed sound insulation. Choosing equipment with lower noise ratings from the start reduces the need for costly retrofits later.
Optimize Piping Design
Using larger-diameter pipes reduces air velocity, which directly lowers noise. Avoiding sharp bends in favor of gradual curves minimizes turbulence. Smooth-walled pipes create less air resistance than corrugated or rough-surfaced alternatives. Flexible connectors at equipment junctions isolate vibrations and prevent them from traveling through the piping network. These design choices, implemented during installation, deliver long-term noise benefits.
Install Acoustic Insulation
Acoustic enclosures around blowers and compressors can reduce noise by 10 to 15 dB. These enclosures are typically lined with sound-absorbing materials such as fiberglass or mineral wool. Wrapping exposed pipes with acoustic blankets prevents noise transmission through the pipe wall. For facilities with existing systems, acoustic retrofitting represents one of the most cost-effective noise reduction measures available.
Implement Regular Maintenance
Worn bearings, loose fasteners, and leaking valves all contribute to excess noise. A scheduled maintenance program that includes lubrication, component inspection, and timely replacement of worn parts keeps equipment running smoothly and quietly. Clean pipe interiors also prevent material buildup that can cause blockages and pressure spikes, both of which increase noise.
Integrate Air Pollution Control
Facilities that address noise often benefit from simultaneously upgrading their air pollution control system equipment. Enclosing noisy blowers not only contains sound but also captures dust, improving overall air quality. Optimized airflow in pneumatic systems reduces both noise and dust generation. This integrated approach delivers a cleaner, quieter, and safer workplace.
San Lan Technologies: Engineered for Quiet Operation
San Lan Technologies Co., Ltd has been designing and manufacturing recycling machinery since 2007. Our plastic pneumatic conveying system equipment is engineered with noise reduction as a core design priority. We offer optimized piping configurations, low-noise blower options, and integrated acoustic solutions that keep operating noise within safe limits.
Our systems are widely used in lithium battery recycling plants, where plastic separator film must be collected and transported efficiently. The pneumatic conveying system collects plastic film from the crushing and separation process and feeds it into hydraulic briquetting equipment. By controlling noise at the source, we help facilities maintain compliance with occupational health regulations while creating a more comfortable working environment.
As an experienced recycling equipment supplier serving customers in over 21 countries, San Lan provides complete EPC project support including customized system design, installation, commissioning, and ongoing technical assistance. Our engineering team holds master's degrees in mechanical engineering and brings over 15 years of experience in e-waste recycling equipment.
Conclusion
The noise level of plastic pneumatic conveying system equipment typically ranges from 65 dB in well-designed small systems to over 90 dB in large industrial installations without noise control measures. Understanding the factors that influence noise—airflow velocity, equipment components, and system design—enables facility managers to make informed decisions about equipment selection and noise mitigation.
By choosing optimized equipment, implementing proper piping design, adding acoustic insulation, and maintaining systems regularly, recycling facilities can achieve significant noise reductions. These improvements protect worker health, boost productivity, and ensure regulatory compliance. For facilities seeking integrated recycling solutions, San Lan Technologies offers engineered pneumatic conveying systems that balance performance, reliability, and quiet operation.
