The terms are often used for closely related mould-cooling devices. Mould heat pipe, heat transfer pipe and heat-pipe cooling pin may describe a sealed device that transports heat from a hot mould area to a cooler area. Always compare the actual construction, operating range, dimensions and installation method rather than relying only on the name.
The official specification table lists Copper and Stainless Steel options. Copper provides high thermal conductivity, while stainless steel can be selected for different structural, compatibility or environmental requirements. The precise grade, internal working fluid and wick structure determine overall performance.
The official page states that a heat pipe has high-speed heat transfer capacity several times faster than copper. This means the phase-change cycle within the pipe moves heat along its length much more effectively than solid copper relies on simple thermal conduction alone.
A heat pipe does not circulate water through its own body, but its condenser end must transfer heat into a heat sink. This heat sink is usually a water-cooled manifold, drilled channel or cooling block. Without an active external cooling circuit to absorb the heat, the pipe and the surrounding mould will eventually overheat.
The heat pipe must be placed in a blind hole machined into the core. A close interference fit, thermal paste or thermal cement is used to minimise the air gap and maximise heat conduction between the mould steel and the pipe body. The opposite end must project into or contact an active cooling passage.
No. A heat pipe is a sealed, vacuum-tight component containing a specific amount of working fluid and an internal wick structure. Cutting, drilling, excessive bending or crushing it destroys the internal vacuum and permanently ruins its heat-transfer capability. It must be ordered in the required length and shape.
An oversized hole creates an air gap between the mould steel and the heat pipe. Air is a poor thermal conductor, so the gap acts as an insulator and significantly reduces heat transfer. The installation hole should follow the clearance and fit tolerances specified for the heat-pipe diameter.
Forcing a heat pipe into an excessively tight or stepped hole can crush, bend or dent the outer tube. This can damage the internal wick structure or breach the vacuum seal, stopping the evaporation cycle and causing the component to fail.
Yes. A thin, even layer of suitable thermal paste or heat-transfer compound fills microscopic air gaps and surface irregularities between the pipe and the bore wall. This ensures continuous, efficient heat conduction from the mould to the evaporator section.
The required condenser length depends on the heat load, pipe diameter, coolant temperature and flow rate. A general guideline is that approximately one-third of the pipe should act as the condenser, but the exact engagement should be verified against the design thermal load and available installation space.
When the condenser end passes into a water channel, the opening must be sealed around the pipe body. This is usually achieved using an O-ring, a threaded collar, a compression fitting or a dedicated sealing plug that secures the pipe while maintaining circuit pressure.
Yes. If scale, rust or mineral deposits build up on the condenser end exposed to the water channel, they act as insulation and reduce heat transfer from the pipe into the coolant. The cooling circuit should use clean, treated water and undergo regular descaling.
A heat pipe can stop working if its sealed body is punctured, crushed or severely bent, releasing the vacuum. It may also fail to transfer heat if thermal paste degrades, condenser cooling is blocked, or the operating temperature exceeds the limits of the internal working fluid.
Inspect the exposed condenser end for scale, corrosion and seal condition. Verify that the pipe is not bent, dented or loose in the core bore. A functional check can involve dipping one end in hot water; the other end should become hot almost instantly. A pipe that heats slowly may have lost its vacuum.
No. The internal vacuum, fluid charge and wick structure cannot be restored in a toolroom. A crushed, punctured or non-functioning heat pipe must be removed, the bore cleaned and inspected, and a new replacement unit installed with fresh thermal paste.
A well-installed, undamaged heat pipe can operate for the life of the tool. Replacement is usually required only if the pipe suffers mechanical damage during mould maintenance, if seals leak unacceptably, or if the condenser section suffers severe corrosion from untreated water.
Yes. Light scale or deposits on the exposed condenser section can be removed carefully during circuit flushing. Avoid aggressive mechanical scraping or abrasive grinding that could thin the tube wall or damage the sealing surface where O-rings sit.
If a pipe is stuck due to hardened thermal paste or tight tolerances, apply penetrating fluid and gently twist or pull using soft-jawed pliers or a designated extractor. Avoid crushing the tube if it must be reused. If the pipe is already failed, it can be drilled or extracted destructively.
Yes, unused heat pipes have a long shelf life. They should be stored flat, protected from physical impact, heavy loads and extreme temperatures, and kept in their original packaging until installation to avoid bending or surface damage.
If a heat pipe is removed for cleaning or inspection, the old thermal paste should be cleaned completely from the pipe and the bore. Fresh thermal paste must be applied before reinstallation to guarantee efficient heat conduction.
The hot spot may return if the heat pipe was damaged, installed without thermal paste, inserted with an air gap, or if the condenser end is restricted from adequate coolant flow. Re-check the installation fit and the cooling-circuit performance.
No. The working fluid is permanently sealed inside the pipe during manufacture. It operates in a continuous, closed-loop evaporation-condensation cycle that requires no maintenance, topping up or fluid replacement throughout its life.
Yes. When a copper condenser end is exposed to untreated water in a circuit containing dissimilar metals (like steel or aluminium), galvanic corrosion can occur over time. Use appropriate coolant inhibitors, stainless-steel pipes or closed-circuit chillers to minimise this risk.
After installing the heat pipe and securing its seal or plug, the main mould-cooling circuit should be pressure-tested with water or air according to plant procedures. Inspect the area around the pipe insertion point for pressure decay or visible leaks before starting production.
They are considered maintenance-free because they contain no moving parts, do not require internal fluid replacement and do not use electrical connections. Maintenance is limited to ensuring the condenser remains clean and the mounting seals remain effective.
