Flexible tubular heater placed in a channel milled into the manifold block and bendable in the field.
Also known as: Manifold heater · Flexible tubular manifold heater · Hot runner manifold heater
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General Information
A manifold heater is a flexible tubular heater designed for heating hot runner manifold blocks. It is placed in a channel milled into the block and secured with an aluminium strip or by peening. Thanks to its flexible structure it can be bent in the field at the turning points of the channel.
Standard diameters are 6.5 mm and 8.5 mm. The channel width should be 0.1–0.2 mm larger than the heater diameter, and its depth should allow the heater to be fully embedded in the channel. Since every air gap between the channel surface and the heater reduces heat conduction, it is important that the retaining strip makes full contact.
The ends are produced as cold zones; no heating takes place on the section that exits the block. This prevents the cable exit from overheating. The cold end length and exit direction must be specified when ordering — depending on block geometry, axial or 90° angled exits can be produced.
Applications
- Hot runner manifolds
- Mould block channels
- Distribution plates
- Custom heating blocks
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Frequently Asked Questions
The groove should be only slightly wider than the heater diameter: the heater must go in without force but must not leave a wide gap. The depth is chosen so that the heater sits flush with the surface. Exact groove dimensions are defined for each project.
Yes. Bending must be done in a single, unforced operation without going below the minimum bend radius, which depends on the heater diameter. Confirm the bend radius for your application at the quotation stage.
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