Band Heaters www.tempco.com | (800) 323-6859 | email: [email protected] 1-82 Maxiband ® Heaters Designed for Durability and Trouble-Free Service Tempco has been manufacturing Maxiband heaters since 1975. The Maxiband is a high quality, durable band heater providing more efficient heating and cooling as well as a longer life compared to other types of band heaters. Due to the rugged construction characteristics of this type of band heater, Maxiband has proven to be extremely valuable and has become the most sought after band heater of its type for plastic injection molding machines, extruders, and blow molding equipment. The initial cost is easily absorbed by the sharp reduction in downtime and labor costs involved in replacing burned-out, less efficient band heaters. Design Features ✴ Quick Installation ✴ Exceptionally Long Life ✴ Rugged, Durable Construction ✴ Excellent Heat Transfer ✴ Contamination Proof ✴ Excellent Temperature Uniformity ✴ Various Lead Terminations Construction Characteristics Maxiband heaters are manufactured in five standard widths: 3/4", 1-1/2", 2-1/2", 3", and 4". They are available in a full range of standard diameters; construction variations for heating only, heat and cool, and cooling only; electrical ratings and a complete arrangement of various types of terminations to accommodate your specific application. For heating only standard sizes and ratings, see pages 1-82 through 1-86. Maxiband MXB heaters, with heat and liquid cooling capabilities, incorporate stainless steel tubing placed in the additional channels of the aluminum track next to the tubular heater. The overall low mass construction and high thermal conductivity of the aluminum provides extremely uniform surface temperatures and rapid cooling cycles. The low thermal expansion strap securely fastened to the aluminum track segments provides a built-in hinge, keeping both halves together at all times, making handling and installation easier. Specially designed integral mounting brackets are welded to the strap, providing the clamping force required to draw the heater assembly evenly and tightly to the cylinder. The straps are equipped with clamping brackets with 1/4"-20 socket head cap screws. On Maxibands exceeding 12" in diameter, spring-loaded screws provide the essential clamping force required in large diameter Maxibands to maintain positive contact with the cylinder being heated. On very large diameter Maxibands, the tubular element required becomes excessively long; therefore, two elements per half are used, each tubular element heating a 90° section of a Maxiband heater. In this case, two terminal boxes are required. A typical application for this type of Maxiband construction is heating the die heads of plastic blown film processing machines. Maxiband heaters are constructed as sets. Each half consists of one tubular heating element and one aluminum track segment. The tubular heaters are always rated at half the total wattage of the set and full rated voltage. For better configuration on larger diam- eter cylinders, Maxibands exceeding 12" in diameter have the alu- minum track segments in quadrants (see page 1-80 for details). Maximum Temperature: 650°F (350°C) Nominal Watt Density: 35 W/in2 (5.4 W/cm2) Maximum Voltage: 277VAC per half Maximum Wattage: Depends on diameter and number of ele- ments used Maximum Amperage: 30 amps per circuit Resistance Tolerance: +10%, –5% Wattage Tolerance: +5%, –10% Up to 11" ID—1/4" gap. As the diameter increases, the gap will also increase accordingly in order to accommodate the thermal expansion of the aluminum track. Minimum Inside Diameter: 3-1/2" (Due to manufacturing constraints, some wattages/voltages may not be available in smaller heater sizes.) Available Heater Widths Maxiband Type 3/4" 1-1/2" 2-1/2" 3" 4" Heating Only • • • • • Heat and Cool N/A N/A • • • Cooling Only • • • • • Cooling Tube Specifications Heater Width 3/4" 1-1/2" 2-1/2" 3" 4" Cooling Tube Diameter 3/8" 3/8" 3/8" 3/8" 3/8" Cooling Tube Extension 4" 4" 4" 4" 4" Cooling Tube Material Stainless Steel Holes Heater Width 3/4" 1-1/2" 2-1/2" 3" 4" Maximum Size Hole N/A 7/16" 7/16" 9/16" 9/16" Hole is located in center of heater width; see page 8-17 for mounting hole location guidelines. For special hole arrangements, supply Tempco with a detailed drawing of your requirements. PHYSICAL SIZE CONSTRUCTION LIMITATIONS STANDARD GAP PERFORMANCE RATINGS ELECTRICAL RATINGS Heat and Liquid Cool Maxibands (MXB) Stainless steel tubing for liquid cooling is placed in the additional channels of the aluminum track next to the tubular heater. The overall low mass construction and high thermal conductivity of the aluminum provides extremely uniform surface temperatures and rapid cooling cycles. Cool Only Maxibands (MXC) Stainless steel tubing for liquid cooling is placed in the aluminum track. HEATER THICKNESS — 1/2"
