Insulated Tunnel Casing for Sterile Air Drying Tunnels

Product Specifications

Technical details and manufacturing context for Insulated Tunnel Casing

Definition

The insulated tunnel casing is the structural component of a sterile air drying tunnel that houses the drying process. It creates a sealed, thermally insulated environment where controlled air flow and temperature conditions can be maintained to efficiently dry products while preventing contamination and heat loss. Constructed from stainless steel (grades 304 or 316L per ASTM A240) with an insulation layer of mineral wool or ceramic fiber, the casing ensures minimal heat transfer to the surroundings. Sealing gaskets maintain a low leak rate (≤1%) to preserve sterile conditions. The casing's internal dimensions vary: width 600–1200 mm, height 600–1000 mm, and length 3000–12000 mm, accommodating different vial or tray sizes and production speeds. Operating temperatures range from 25°C to 350°C, with temperature uniformity of ±3°C critical for sterilization validation. Heating power ranges from 12 to 120 kW, and air flow rates from 1500 to 8000 m³/h ensure uniform temperature distribution. Insulation thickness (50–150 mm) reduces energy loss, keeping external surface temperature ≤40°C for safety. The casing's weight (800–5000 kg) affects installation and floor loading. These parameters are reference ranges; actual values must be confirmed with the manufacturer for specific models. The casing is designed to contain sterile air and maintain required conditions, but its performance depends on proper integration with the drying tunnel's heating, air handling, and control systems. Verification of material grades, leak rates, and temperature uniformity should be part of procurement checks. Maintenance signals include increased external surface temperature, higher leak rates, or visible damage to insulation or seals. Failure boundaries include loss of thermal insulation integrity or seal failure, which can compromise drying efficiency and sterility.

Working Principle

The casing provides a sealed, insulated chamber where heated, sterile air circulates to remove moisture from products. Its insulation minimizes heat transfer to the external environment, maintaining consistent internal temperatures for efficient drying while reducing energy consumption. The low leak rate ensures containment of sterile air, preventing contamination. The casing's design allows for controlled air flow and temperature uniformity, essential for reproducible drying results.

Common Materials

Stainless steel, Insulation material (mineral wool or ceramic fiber), Sealing gaskets

Technical Parameters

Parameter	Typical range	Notes & selection driver
Internal Width	600–1200 mm	Determines maximum vial or tray size.
Internal Height	600–1000 mm	Affects clearance for containers and airflow.
Tunnel Length	3000–12000 mm	Longer tunnels allow higher production speeds.
Operating Temperature	25–350 °C	Above 350°C requires special insulation materials.
Temperature Uniformity	±3 °C	Critical for sterilization validation.
Heating Power	12–120 kW	Depends on tunnel length and temperature.
Air Flow Rate	1500–8000 m³/h	Ensures uniform temperature distribution.
Insulation Thickness	50–150 mm	Thicker insulation reduces energy loss.
External Surface Temperature	≤40 °C	Safety requirement to prevent burns.
Leak Rate	≤1 %	Ensures containment of sterile air.
Material Grade	304/316L	316L for corrosive environments.ASTM A240
Weight	800–5000 kg	Affects installation and floor loading.

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Outer Shell Part
Provides structural integrity and external protection

Material: Stainless steel
Insulation Layer Part
Minimizes heat transfer to maintain internal temperature

Material: Mineral wool or ceramic fiber
Inner Liner Part
Creates a smooth internal surface for air flow and easy cleaning.

Material: Stainless steel
Sealing System Part
Ensures airtight connection between casing sections

Material: Silicone or high-temperature gaskets
Access Doors
Allow maintenance access while maintaining seal integrity

Material: Stainless steel with insulation

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Sterile Air Drying Tunnel

View system integration details

Drying/Evaporation Tunnel

View system integration details

Manufacturers of Insulated Tunnel Casing

Manufacturer profiles associated with Insulated Tunnel Casing.

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Frequently Asked Questions

What materials are used in the insulated tunnel casing?

The casing is typically made of stainless steel (grades 304 or 316L per ASTM A240) with insulation material such as mineral wool or ceramic fiber, and sealing gaskets to ensure low leak rates.

What are the typical internal dimensions of the casing?

Internal width ranges from 600 to 1200 mm, height from 600 to 1000 mm, and length from 3000 to 12000 mm, depending on the model and production requirements.

How does the casing maintain temperature uniformity?

The casing's insulation and sealed design, combined with controlled air flow (1500–8000 m³/h) and heating power (12–120 kW), help maintain temperature uniformity of ±3°C, which is critical for sterilization validation.

What safety features are included?

The external surface temperature is kept at or below 40°C to prevent burns, and the leak rate is limited to ≤1% to ensure containment of sterile air. Always verify these parameters with the manufacturer for the specific model.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Atmospheric to 0.5 bar gauge (positive pressure), -0.2 bar gauge (negative pressure)
other spec:	Air flow rate: 0.5-5 m/s, Slurry concentration: ≤15% solids by weight, Humidity: 0-100% RH (non-condensing)
temperature:	+25°C to +350°C

Insulated Tunnel Casing

Product Specifications

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards