Industry Guide·OSHA Compliance·12 min read·Updated March 2026
Paper and pulp manufacturing is one of the highest-noise industrial sectors in the United States. Paper machines, chippers, refiners, and steam systems generate sustained broadband noise that routinely reaches 95–110 dBA in production areas — well above OSHA’s permissible exposure limit. OSHA data consistently shows pulp and paper among the industries with the highest rates of occupational hearing loss. For employers in this sector, a comprehensive hearing conservation program under 29 CFR 1910.95 is not a compliance possibility — it is a certainty once monitoring is conducted.
Soundtrace serves pulp and paper employers as professional supervisor, combining audiometric testing, noise monitoring data, and REAT-based HPD fit testing into a single unified worker profile viewable in the cloud portal.
95–110 dBA
Typical paper machine room noise range — among the highest sustained levels in U.S. industry
Top 5
Paper/pulp consistently ranks in OSHA’s top five industries for occupational hearing loss rates
Dual risk
Chemical pulping involves ototoxic solvents that synergistically amplify noise-induced cochlear damage
The Compliance RealityIn virtually every paper and pulp facility with production operations, noise monitoring will confirm that the majority of production workers are exposed above OSHA’s 85 dBA action level. The question is not whether an HCP is required — it is whether the one in place is adequate.
Why Paper and Pulp Is Among the Highest-Noise Industries
The physics of papermaking creates extreme acoustic environments. The paper machine itself is a massive, high-speed mechanical system — a continuous web of forming wire, press rolls, dryer cans, and calender stacks moving at speeds of up to 60 mph in modern facilities, all under significant tension and all generating mechanical noise. The dryer section alone, where dozens of steam-heated cast iron cylinders rotate at high speed, is often the loudest sustained source in the facility.
Chemical pulping adds another dimension. Digesters, blow tanks, washers, and recovery boilers all involve high-pressure steam, chemical flows, and large rotating equipment. The recovery boiler — a central element of the kraft pulping process — is both extremely hot and extremely loud. Workers in the recovery area face some of the highest sustained noise doses in the industry.
Unlike many high-noise industries where exposure is intermittent (a stamping press that cycles, a can seamer that runs only when the line is running), the paper machine runs continuously at production speed 24 hours a day, often 7 days a week. Workers stationed in machine room areas receive high-dose continuous exposure for their entire shift, every shift.
Pulp Mill Noise Sources and Typical Levels
100–115
dBA
Wood chippers and hogs
Among the loudest sources in any industrial facility. Impact noise from wood-on-chipper-disk contact, combined with motor and drive noise, produces very high broadband levels. Workers in chip yard and chipper building areas are among the highest-exposed in the facility.
100–112
dBA
Refiners and disk refiners
Mechanical and thermomechanical pulping refiners are sustained high-intensity sources. The disk-to-pulp grinding action produces broadband noise with strong high-frequency content. Refiner buildings typically require dual hearing protection for workers stationed inside.
92–105
dBA
Recovery boilers and power boilers
Combustion noise, fan noise, and steam system noise combine in boiler areas. The recovery boiler in kraft mills is a major sustained source for operators who monitor and maintain it. Steam leaks and blow-off operations produce additional high-intensity events.
88–102
dBA
Large centrifugal pumps and pump stations
Chemical and stock pumps of the size used in pulp and paper operations generate substantial noise from motor, impeller, and pipe-borne transmission. Pump buildings and valve galleries accumulate noise from multiple simultaneous sources in reverberant spaces.
88–100
dBA
Digesters and blow tanks
Continuous cooking and pulp discharge operations generate sustained noise from valve actuation, steam flow, and structural vibration. Kraft mill brown stock washing areas also produce significant ambient noise from washer drums and associated drives.
Paper Machine and Finishing Area Noise Sources
95–110
dBA
Paper machine dryer section
The dryer section is typically the loudest area in the paper machine building. Dozens of steam-heated cast iron dryer cans rotating at high speed, combined with drive gear noise and hood ventilation systems, produce sustained broadband noise well above the OSHA PEL for workers stationed nearby.
92–105
dBA
Calenders and supercalenders
Multi-nip calendering equipment produces roll-to-roll contact noise and drive noise across the machine width. Supercalenders with large-diameter rolls are among the louder paper finishing machines. Web break events generate additional sudden high-intensity acoustic events.
90–105
dBA
Coating and metering systems
Air knife coaters and jet applicators use high-pressure air that generates broadband noise at application points. Coating kitchen equipment — agitators, pumps, and mixing vessels — adds additional ambient noise in the coating preparation area.
90–102
dBA
Winders and rewinders
High-speed paper web contact with reel drums and roll surfaces, combined with core chucks and unwind/rewind drive systems, produces sustained noise that operators are continuously exposed to during production runs.
88–100
dBA
Sheeting and cutting operations
Rotary cutters and guillotine sheeters produce impact noise at each cut cycle. At production line speeds, cut frequency produces high TWA exposures for operators stationed at these machines despite relatively low peak levels per individual cut.
Ototoxic Chemical Co-Exposure in Pulp Mills
Chemical pulping processes — particularly kraft and sulfite pulping — involve worker exposure to a range of chemical compounds, some of which have documented ototoxic properties. Ototoxic chemicals cause cochlear damage through a mechanism different from acoustic trauma, but the two hazards act synergistically: a worker exposed to both noise and ototoxic chemicals develops greater hearing loss than either hazard alone would predict.
In kraft mill environments, workers may be co-exposed to hydrogen sulfide, organic sulfur compounds, and turpentine derivatives. Sulfite mill workers may encounter sulfur dioxide at concentrations above background. Chemical recovery workers handling tall oil and related byproducts may have additional organic solvent exposures. While these compounds are not all definitively established as cochlear ototoxins at occupational exposure levels, the combination of high noise and chemical exposure in these work areas warrants heightened audiometric surveillance.
The practical implication for HCP management in kraft and sulfite mills: workers in chemical recovery, digester, and blow tank areas should receive audiometric review that explicitly considers both noise dose and chemical co-exposure when evaluating audiometric patterns and STS findings. Progressive hearing loss that exceeds what noise dosimetry alone would predict should prompt evaluation for chemical ototoxin contribution.
Job Classifications and HCP Enrollment
| Job Classification | Primary Noise Sources | Typical Enrollment |
|---|
| Paper machine operators | Dryer section, calender, winder, wet end | Essentially universal — all machine positions above action level |
| Pulp mill operators | Digesters, refiners, washers, recovery area | Essentially universal in production areas |
| Chipper and woodyard workers | Chippers, hogs, conveyors | Essentially universal — among highest-exposed workers in facility |
| Maintenance mechanics and electricians | All production equipment during work | Monitor; typically at or above action level for most task profiles |
| Power and recovery boiler operators | Boiler, steam systems, fan decks | Typically above action level; monitor for specific positions |
| Quality lab and technical staff | Variable; often lower than production floor | Depends on time spent in production areas; monitor to determine |
| Supervisors and foremen | Variable by time in production areas | Personal dosimetry required; may or may not meet action level |
HCP Requirements for Pulp and Paper Employers
At noise levels common in pulp and paper — with many workers at or above the OSHA PEL of 90 dBA — HPD adequacy calculation becomes a critical compliance element, not just a formality. Using OSHA Appendix B derated NRR calculations:
- A worker at 105 dBA TWA requires at minimum 15 dB of effective attenuation to reach 90 dBA. After the Appendix B derating, this requires an HPD with a labeled NRR of at least 37 dB using A-weighted calculation ((NRR − 7) / 2 ≥ 15) — or dual protection.
- Workers with confirmed STS must have HPDs attenuating to 85 dBA or below, requiring even greater effective attenuation at high noise levels.
- REAT fit testing verifies that individual workers are actually achieving adequate attenuation from the HPDs they wear, rather than assuming population-average performance.
At noise levels above 100 dBA, dual hearing protection (earplugs plus earmuffs worn simultaneously) may be required for some positions. This must be documented in the written HCP and enforced consistently.
Engineering Controls in Pulp and Paper
The most effective long-term noise control strategy for pulp and paper operations addresses source noise at the equipment level:
- Acoustic enclosures for chippers and refiners. These are among the highest-priority targets given the extreme noise levels. Even partial enclosures with acoustic blanket lining can reduce ambient levels in surrounding areas by 5–15 dB.
- Anti-vibration isolation for large pump motors. Isolation mounts and flexible pipe couplings reduce structure-borne noise transmission from pump stations to adjacent working areas.
- Remote monitoring and control rooms. Moving operators out of the machine room and into acoustically isolated control rooms for process monitoring tasks eliminates a significant portion of their shift exposure without reducing their ability to manage the process.
- Vibration damping on dryer section components. Dryer can vibration transmission is a major noise contributor in the paper machine building. Damping treatments on can surfaces and drive gear enclosures reduce broadband radiation.
▶ Bottom line: Engineering controls in pulp and paper require capital investment, but even modest reductions — 3–5 dB in a 105 dBA machine room — meaningfully reduce worker dose and may move borderline workers below the PEL, reducing both HPD requirements and STS risk.
Frequently asked questions
Are paper and pulp mills required to have a hearing conservation program?
Yes. Virtually every paper and pulp mill with production operations will have employee exposures above the 85 dBA action level. OSHA 29 CFR 1910.95 applies to all general industry employers regardless of size, and there is no industry exemption. Noise monitoring in pulp and paper facilities routinely confirms the need for a comprehensive HCP.
What are the noisiest areas in a typical pulp mill?
Wood chippers and hogs (100–115 dBA) and refiners (100–112 dBA) are typically the loudest. Recovery boiler areas, pump stations, and chemical processing areas also commonly exceed 90 dBA. Personal dosimetry for workers in these areas will typically confirm exposures well above both the action level and the PEL.
Do workers in kraft mills face additional hearing risks from chemical exposure?
Potentially. Some compounds encountered in chemical pulping environments — organic solvents, sulfur compounds — may have ototoxic properties that synergistically amplify noise-induced cochlear damage. Workers in chemical recovery, pulping, and blow tank areas with both high noise and chemical co-exposure warrant heightened audiometric surveillance, and PS review should consider both hazard types when evaluating audiometric trends.
Is dual hearing protection required in paper mills?
For some positions at noise levels above 100 dBA, the Appendix B derated NRR calculation for single HPDs may not achieve the required attenuation to reach 90 dBA (or 85 dBA for post-STS workers). In those cases, dual protection — earplugs worn simultaneously with earmuffs — is required. This must be specified in the written HCP and enforced at the position level.
HCP Built for High-Noise Industrial Operations
Soundtrace serves as professional supervisor for pulp and paper hearing conservation programs, combining audiometric testing, noise monitoring data, and REAT-based HPD fit testing into a single unified worker profile.
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