Listing

Image	Name	Add
	Band Heaters UH (custom-made)

More Information

Mica type and Ceramic type Heater Bands are primarily used on injection moulding and extrusion machines in the plastic industry. Other applications include packaging machines and general heating of containers, pipes. A distinctive feature of these elements is even heat distribution over a large surface area. Construction consists of heating wire, insulated with either Mica-plates or ceramic formers. The elements are usually metal shrouded for mechanical strength.

Mica and Ceramic insulation

Mica Insulation: Mica insulation offers thin construction (4mm), maximum Watts density of 3.5 W/cm² and operation up to 380°C. For process temperatures in excess of 280°, ceramic insulation is preferred.
Ceramic Insulation: Ceramic elements are thicker in construction (12mm) but offer a Watts density of 5.5 W/cm² and operating temperature up to 600°C. Generally ceramic elements are more durable than mica elements, thus offsetting the higher price with a longer life expectancy.

Calculation of maximum Power Rating:

The power rating of the element does have an influence on it’s lifespan. We therefore recommend that a lower power rating is chosen if the process allows for this.

Mounting, Storage and Commissioning

Mounting: Good thermal contact between the element and metal surface to be heated is essential. Warping of elements will result in air pockets, causing hot spots and possible failure of the element. It is therefore important that elements are clamped on tightly and that clamps are retightened once elements have reached operating temperature.

Storage and Commissioning: Elements are susceptible to moisture and should be stored or used in a dry environment. It is recommendable to heat up the elements gently after a prolonged period out of commission. This allows moisture to escape and prevents damage to the elements. Some temperature controllers have a “soft start” feature, but a similar result is achieved by turning the temperature controller down initially

Fitting: Fitting of bands is preferably done by sliding them on. Where it is not practical, bands have to be bent open and then wrapped around the barrel. This causes deformation of the shape and possible damage. In this case it is advisable to use a "flexible band" (less rigid construction) or a hinged element. Hinged elements are to be used where elements are removed frequently or where the diameter of the band is less than 150mm. For elements with a diameter larger than 300mm, we recommend the use of spring loaded clamps to counteract the expansion during heating.

Download pdf brochure