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Jacketed Paddle Dryer

Updated: 2026-07-22

Overview

The jacketed paddle dryer is a versatile industrial dryer designed for heat-sensitive or sticky materials. It combines indirect heating through a thermal jacket with mechanical agitation via rotating paddles, ensuring uniform drying without localized overheating. Common in batch processing, it excels in industries requiring controlled moisture removal, such as pharmaceutical intermediates or specialty chemicals. Its closed-system design supports solvent recovery and complies with GMP standards for hygiene-critical applications.

Structure and Working Principle

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The dryer consists of a horizontal cylindrical body with a double-layered jacket (for steam/oil heating) and a central shaft fitted with paddles. As the shaft rotates, paddles lift and disperse materials while the jacket transfers heat indirectly. Vacuum options reduce boiling points for low-temperature drying. The absence of direct flame or hot air minimizes product degradation, making it ideal for organic compounds or pigments where color retention is crucial.

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Key Features

1. **Gentle Handling**: Paddle design prevents material shearing, preserving particle integrity. 2. **Energy Efficiency**: Jacket heating reduces heat loss compared to convective dryers. 3. **Adaptability**: Handles slurries, filter cakes, and high-moisture content (up to 80%). Optional features include PLC control, CIP systems, and explosion-proof configurations for solvent-laden materials. The modular design allows customization of paddle shapes for sticky or abrasive products.

Application Areas

**Pharmaceuticals**: Drying APIs, granules with strict temperature limits. **Chemicals**: Processing dyes, pigments, and hygroscopic salts. **Food**: Dehydrating starch, yeast, or heat-sensitive additives. It’s particularly effective for materials prone to agglomeration or requiring solvent recovery. Large-scale models in chemical plants may handle 5,000+ liter batches.

Maintenance and Precautions

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Regularly inspect paddle seals and bearing lubrication to prevent leaks or friction wear. Post-processing cleaning is critical for cross-contamination prevention, especially in pharma applications. Avoid thermal shock by gradually heating/cooling the jacket. For corrosive materials, specify Hastelloy-lined jackets or PTFE-coated paddles. Annual pressure tests are recommended for vacuum-rated units.

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B2B Procurement Guide

When sourcing, clarify: 1. **Material compatibility**: SS316L for chlorides, polished surfaces for sticky products. 2. **Heating media**: Steam (≤150°C), thermal oil (≤300°C), or electric tracing. 3. **Certifications**: ATEX for explosives, FDA compliance for food contact. Leading manufacturers include GEA, Büchi, and local OEMs in China/India. Used units cost 30–50% less but require thorough inspection for paddle warping or jacket leaks.

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