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Aluminum Door Leaf Profile – BOB-30557

The door leaf is one of the most critical structural components in cold room door systems, especially for negative temperature cold rooms. In such environments, the door leaf must provide superior thermal insulation, high mechanical strength, and long-term durability. The BOB-30557 Aluminum Door Leaf Profile, developed by Bob Modüler, is specifically designed for negative temperature cold room doors and is fully compatible with the polyurethane injection manufacturing system.

BOB-30557 is engineered to meet the demanding requirements of freezer rooms, frozen food storage areas, and industrial cold storage facilities where temperatures typically operate at –18 °C and below.

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Aluminum Door Leaf Profile

Why Negative Temperature Cold Room Door Leaves Require Special Design

Negative temperature cold rooms expose door systems to extreme operating conditions, including:

  • High temperature differentials
  • Increased condensation and icing risks
  • Frequent door opening and closing cycles
  • Strict requirements for airtight sealing

Under these conditions, any thermal bridge or weak sealing point can result in energy loss, icing problems, or premature system failure. The BOB-30557 Aluminum Door Leaf Profile is specifically designed to address these challenges.

Cold Room Door Leaf Manufacturing with BOB-30557

BOB-30557 is optimized for polyurethane injection door leaf production. The manufacturing process follows these steps:

  1. Aluminum Profile Preparation

The aluminum door leaf profiles are precisely cut according to the required door dimensions and assembled to form a rigid frame structure.

  1. Placement of Metal Sheets

Metal sheets forming the inner and outer surfaces of the door leaf are positioned within the aluminum profile frame.

  1. Thermal Isolation Between Aluminum and Sheet Metal

One of the most critical technical advantages of BOB-30557 is its ability to interrupt thermal transfer between the aluminum profile and the metal sheet.
For this purpose, either:

  • BOB-P571 – Cold Room Door Leaf U Gasket, or
  • BOB-P66 – Cold Room Door Leaf Isolation Rubber

is applied between the aluminum profile and the sheet metal.

This application:

  • Eliminates direct contact between aluminum and steel
  • Prevents thermal bridge formation
  • Reduces condensation and icing risks
  • Significantly improves overall insulation performance
  1. Polyurethane Injection

High-density polyurethane foam is injected into the prepared door leaf structure. The foam expands uniformly, filling all cavities and creating a monoblock door leaf with:

  • Excellent thermal insulation
  • High mechanical rigidity
  • Long-term dimensional stability

Compatibility with Polyurethane Injection Systems

The BOB-30557 Aluminum Door Leaf Profile features a geometry specifically engineered for polyurethane injection processes. This ensures:

  • Homogeneous foam distribution
  • No voids or weak insulation zones
  • Reduced deformation risk after curing
  • Reliable performance in negative temperature environments

Application Areas – Negative Temperature Cold Room Doors

BOB-30557 is used for manufacturing door leaves for:

  • Cold room hinged door leaf
  • Cold room sliding door leaf
  • Cold room automatic sliding door leaf
  • Cold room monorail sliding door leaf

All applications are intended for negative temperature cold room doors.

Compatible Gasket Models (Code + Name)

To achieve maximum airtightness and energy efficiency, BOB-30557 is compatible with a wide range of cold room door gaskets. Compatible gasket models include:

  • BOB-K19 – Cold Room Door Rubber
  • BOB-K4 – Cold Room Door Rubber (T-Base EPDM)
  • BOB-K6 – Cold Room Door Rubber (Co-ex EPDM)
  • BOB-K3 – Cold Room Sliding Door Rubber
  • BOB-P579 – Cold Room Door Threshold Rubber (PVC)
  • BOB-P240 – Cold Room Door Threshold Rubber (Alternative PVC Geometry)
  • BOB-K23 – Cold Room Door Rubber (Arrow-Base Co-ex EPDM)
  • BOB-K31 – Cold Room Door Rubber with Heating Cable Channel
  • BOB-K59 – Cold Room Door Rubber (Dimension Variant)

These gasket options allow designers and manufacturers to select the most suitable sealing solution based on door type, usage frequency, and temperature conditions.

Advantages of Anodized Aluminum Structure

The BOB-30557 Aluminum Door Leaf Profile is manufactured from anodized aluminum, offering:

  • High corrosion resistance
  • Long service life in humid and frozen environments
  • Hygienic, easy-to-clean surfaces
  • Professional and aesthetic appearance

These characteristics make it particularly suitable for food industry cold storage applications.

Conclusion

The BOB-30557 Aluminum Door Leaf Profile is a professional solution developed for negative temperature cold room door leaves manufactured using the polyurethane injection system.
By combining:

  • Thermal isolation using BOB-P571 or BOB-P66
  • Wide gasket compatibility (code + name)
  • High-performance anodized aluminum structure
  • Polyurethane injection compatibility

BOB-30557 enables the production of energy-efficient, durable, and reliable freezer room door leaves.

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