Technical orientation for plastics processors and machine manufacturers: Which type of heating band provides the best combination of heat conduction, contact surface, process reliability and design flexibility today?
Modern plastics processing places higher demands on heat distribution, contact area and repeatability. ZAK sets the reference here. M and MC are technological developments of classic designs. KHK and Z remain proven solutions for simple or clearly defined applications.
aluminium compact band heater for homogeneous heat conduction, full-surface contact and sophisticated tool contours.
Further development for robust contact heating if geometry and temperature range remain standard.
Further development for classic geometries with increased temperature requirements up to 550 °C.
Ceramic radiant heating has been established for decades and is used in simple applications.
For uncomplicated standard tasks when low technical requirements are the priority.
| criterion | ★ ZAKPremium compact band heater |
M | MC | KHK | Z |
|---|---|---|---|---|---|
| Application recommendation | State-of-the-art for modern plastics processing when dimensional accuracy, heat distribution and operational safety count | Modern contact technology for clearly defined standard geometries | Modern high-temperature contact technology up to 550 °C | Classic ceramic radiant heating for simple existing and standard applications | Simple solution for low technical requirements |
| Technology level | Modern reference design with a unique design feature ZAK focus | Technological further development of classic band heater designs | Technological development for higher operating temperatures | Ceramic technology has been established for decades | Proven, simple basic technology for basic applications |
| Typical borderline case | If tool contour, holes, recesses or heat distribution are relevant to the process | When modern contact heating is sufficient for standard geometries | When high temperature resistance is more important than maximum geometry adjustment | If existing ceramic technology or radiant heat is expressly required | When simple heating is sufficient without any special process requirements |
| Customer risk if the wrong selection is made | Reduces the risk of uneven temperature control, poor fit and unnecessary energy loss | Limited adaptability for complex geometries | Limited for complex geometries, but high in temperature | Not ideal if full-surface contact is desired | Limited technical reserves for demanding applications |
| Basic properties | |||||
| Special features | Dimensionally stable aluminium compact band heater with full-surface contact, homogeneous heat distribution and high adaptability Unique position | Quickly reacting, highly resilient, contact heating with low storage effect | Mineral or ceramic insulated contact heating with low storage effect | Electrically robust, ceramic insulated radiant heater with storage effect | Mica insulated standard band heater for injection moulding and extrusion |
| Maximum operating temperature | 450°C | 450°C | 550°C | 400°C | 280°C |
| Sheath material | aluminium, stainless steel or FAL Premium | stainless steel | after execution | after execution | Fire-aluminized thin sheet FAL |
| Operating voltage | 230 to 250V | 230 to 250V | upon request | upon request | 230V |
| Performance data | |||||
| Maximum power density | 4.5W/cm² | 5W/cm² | 6W/cm² | 6.5W/cm² | 3.5W/cm² |
| Wall thickness | 11/14mm depending on dimensions Robust | approx. 5mm | approx. 7mm | approx. 11mm | approx. 3.5mm |
| Star 230/400 V Triangle 3 x 400 V | from 110 mm length | from 110 mm length | not possible | from 81 mm length | from 80 mm length |
| Dimensions and flexibility | |||||
| Dimension range Ø | ≥ 80mm to 399mm smallest Ø | ≥ 65mm to 399mm | ≥ 50mm to 225mm | ≥ 60mm to 499mm | ≥ 40mm to 399mm |
| Dimension range length | ≥ 40mm to 400mm | 38 mm, ≥ 50 in 10 mm increments up to 250 mm | 38, 50, 60mm to 499mm | ≥ 28mm to 501mm | ≥ 20 mm, max. 3 times Ø up to 500 mm |
| Multi-part versions | from 400 mm in 2/2 from 650 mm in 3/3 from 950 mm in 4/4 | from 400 mm in 2/2 from 650 mm in 3/3 from 950 mm in 4/4 | 226mm in 2/2 450mm in 3/3 675mm in 4/4 | from 500 mm in 2/2 from 650 mm in 3/3 from 950 mm in 4/4 | from 400 mm in 2/2 from 650 mm in 3/3 from 950 mm in 4/4 |
| Spreadability | from Ø 100 mm via two-part inner band Flexible | possible | from Ø 100 mm via two-part inner band | possible | not provided |
| Holes and recesses | Particularly suitable for demanding geometries Unique position | according to specified dimensions | according to specified dimensions | possible | not provided |
| Connection and sensors | |||||
| Clamping gap standard | 6 / 8 / 12 mm, Ø dependent | 6 / 8 / 12 mm, Ø dependent | 6 / 8 / 12 mm, Ø dependent | approx. 6mm | approx. 6mm |
| Tension fasteners | Clamping straps from Ø 120 mm TFV | Clamping straps from Ø 120 mm TFV | Clamping straps from Ø 200 mm TFV | after execution | up to Ø 399 mm clamping straps, from Ø 400 mm DFV |
| Connection caps | axial A or S radial B tangential C | axial A or S radial B tangential C | axial A or S radial B tangential C | after execution | axial A radial B tangential C |
| Integrated temperature sensor | Type L, J, K Integrated | Type L, J, K and PT 100 | Type L, J, K and PT 100 | after execution | not provided |
| Equipment and certification | |||||
| Heat sensor socket | ✓ | ✓ | ✓ | ✓ | ✓ |
| Hot surface warning sign | ✓ | ✓ | ✓ | from 36 mm | from 30 mm |
| Cable versions | Wire mesh up to 250 °C GLS type 600 to 600 °C | Wire mesh up to 250 °C GLS type 600 to 600 °C | Wire mesh up to 250 °C GLS type 600 to 600 °C | Wire mesh up to 250 °C | Wire mesh up to 250 °C |
| UL version possible | ✓ | ✓ | − | ✓ | − |
| Overall rating | |||||
| Process reliability | ●●●●● | ●●●●● | ●●●●● | ●●●●● | ●●●●● |
| Thermal homogeneity | ●●●●● | ●●●●● | ●●●●● | ●●●●● | ●●●●● |
| Geometry adjustment | ●●●●● | ●●●●● | ●●●●● | ●●●●● | ●●●●● |
| Energy efficiency | ●●●●● | ●●●●● | ●●●●● | ●●●●● | ●●●●● |
| Custom made | ●●●●● | ●●●●● | ●●●●● | ●●●●● | ●●●●● |
| Temperature range | ●●●●● | ●●●●● | ●●●●● | ●●●●● | ●●●●● |
| Economic efficiency for standard applications | ●●●●● Technically stronger, but not always necessary | ●●●●● | ●●●●● | ●●●●● | ●●●●● |
| Proven in everyday life | ●●●●● | ●●●●● | ●●●●● | ●●●●● | ●●●●● |
| Investment level | higher, technically demanding | medium | medium to higher | medium to higher | low |
ZAK is the right solution if a band heater not only needs to heat, but should also work consistently, dimensionally stable and process-reliable over the long term. The real difference arises where standard technology reaches technical limits due to contours, recesses or contact surfaces.
KHK and classic ceramic band heaters have been the basic types that have been tried and tested for decades. M and MC are new technological developments and successors when more modern contact heating with better technical design is required.
M is suitable for modern standard applications. MC is useful if operating temperatures of up to 550 °C are required. KHK remains suitable when a ceramic insulated radiant heater is specifically required. Z remains a price-oriented solution for simple applications.
The appropriate heating band design depends on the geometry, temperature range and process requirements. For simple standard applications, a classic design can be economically sufficient. If recesses, tight tolerances, uniform heat conduction or high process reliability are required, the selection should be examined more closely. The matrix shows the technical differences between the designs and helps to classify the solution based on the application.
The ZAK series is the strongest solution for complex geometries, bores, recesses and tight tolerances because it combines a dimensionally stable aluminium compact design with high adaptability.
The advantage lies in the full-surface contact, the homogeneous heat distribution and the dimensionally stable design. This makes ZAK particularly suitable for demanding applications in injection moulding and extrusion.
A standard band heater is sufficient if the geometry is simple, no special recesses are necessary and temperature control does not play a critical role in the process.
MC makes sense if an operating temperature of up to 550 °C is required. When it comes to geometry flexibility, contact quality and thermal homogeneity, ZAK remains the stronger premium solution.