Structured Manufacturing Data (2026)

Coating Drum

Based on aggregated insights from structured factory profiles within the CNFX directory, the standard Coating Drum used in the Machinery and Equipment Manufacturing sector typically supports operational capacities ranging from standard industrial configurations to heavy-duty production requirements.

Technical Definition & Core Assembly

A canonical Coating Drum is characterized by the integration of Drum Shell and Baffles. In industrial production environments, manufacturers listed on CNFX commonly emphasize Stainless Steel 316L construction to support stable, high-cycle operation across diverse manufacturing scenarios.

Rotating cylindrical vessel in pharmaceutical coating machines where tablets are coated with polymer films.

Product Specifications

Technical details and manufacturing context for Coating Drum

Definition
The coating drum is the core rotating component of a pharmaceutical tablet coating machine where tablets are tumbled while coating solutions are sprayed onto them, creating uniform polymer film coatings for controlled release, protection, or aesthetic purposes.
Working Principle
Tablets are loaded into the rotating drum, which tumbles them continuously. Coating solutions are atomized and sprayed onto the tumbling tablets while heated air is circulated to evaporate solvents, forming a uniform film coating on each tablet surface.
Common Materials
Stainless Steel 316L
Technical Parameters
  • Drum diameter and length determine batch capacity and coating efficiency (mm) Customizable
Components / BOM
  • Drum Shell Part
    Main cylindrical body containing the tablets
  • Baffles Part
    Internal plates that improve tablet mixing and tumbling
  • Drive Shaft Part
    Transmits rotational force to the drum
  • Bearings Part
    Support the rotating drum and reduce friction

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Coating Drum.

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: Atmospheric to 0.5 bar (slight positive pressure for containment)
flow rate: 5-50 L/min (coating solution spray rate)
temperature: 20-80°C (typical coating process range)
slurry concentration: 5-25% solids (polymer coating suspension)
Media Compatibility
✓ Aqueous polymer solutions (HPMC, PVP) ✓ Organic solvent-based coatings (EC in ethanol) ✓ Sugar-based coating suspensions
Unsuitable: Highly corrosive acidic/alkaline solutions (pH <2 or >12)
Sizing Data Required
  • Batch size (kg of tablets)
  • Required coating thickness (microns)
  • Available floor space/height constraints

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Coating buildup and material bridging
Cause: Inadequate cleaning cycles, improper material feed rates, or insufficient drum rotation causing uneven coating distribution and internal buildup that leads to imbalance and mechanical stress.
Bearing and seal failure due to contamination
Cause: Ingress of coating materials, dust, or moisture into bearing housings and seals, often from worn seals, improper maintenance practices, or harsh operating environments, leading to lubrication breakdown and premature wear.
Maintenance Indicators
  • Unusual vibration or rhythmic knocking sounds during operation, indicating imbalance, bearing wear, or internal material buildup.
  • Visible coating material leakage around seals or joints, or excessive heat generation on bearing housings detected via thermal imaging or touch.
Engineering Tips
  • Implement a strict preventive maintenance schedule for seal inspections and replacements, and use high-temperature, chemical-resistant seals compatible with coating materials to prevent contamination ingress.
  • Optimize drum rotation speed and cleaning cycles using automated controls to ensure even coating distribution and prevent material buildup, reducing mechanical stress and wear.

Compliance & Manufacturing Standards

Reference Standards
ISO 12944-5:2019 - Corrosion protection of steel structures by protective paint systems ASTM D4541-22 - Standard Test Method for Pull-Off Strength of Coatings Using Portable Adhesion Testers CE Marking - Machinery Directive 2006/42/EC for safety requirements
Manufacturing Precision
  • Drum concentricity: +/-0.05 mm
  • Surface finish: Ra ≤ 3.2 μm
Quality Inspection
  • Adhesion test per ASTM D4541
  • Coating thickness measurement per ISO 2808

Factories Producing Coating Drum

Manufacturer profiles with relevant production capability in China

Manufacturer listings support early research and capability understanding. They are not certification, ranking, or transaction guarantees.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What are the benefits of using Stainless Steel 316L for coating drums?

Stainless Steel 316L offers superior corrosion resistance, essential for pharmaceutical applications where cleanliness and material integrity are critical. It withstands harsh cleaning chemicals and maintains hygiene standards.

How do baffles in the coating drum improve tablet coating quality?

Baffles create turbulent flow inside the rotating drum, ensuring tablets tumble evenly for consistent polymer film application. This prevents clumping and achieves uniform coating thickness across all tablets.

What maintenance is required for coating drum bearings and drive shafts?

Regular lubrication and inspection of bearings and drive shafts are essential to prevent wear and ensure smooth rotation. Follow manufacturer guidelines for maintenance intervals to avoid downtime and maintain coating precision.

Can I contact factories directly on CNFX?

CNFX is an open directory, not a transaction platform. Each factory profile provides direct contact information and production details to help you initiate direct inquiries with Chinese suppliers.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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