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Nozzle Series
When it comes to making better plastic parts, there is no such thing as off-the-shelf solutions. Rheo-Pro® hot runner systems offer the most versatile selection of gating methods, tips styles and nozzle sizes in the industry for a complete range of injection molding applications. Mold Hotrunner Solutions® designs, builds and tests all the standard components in the Rheo-Pro® catalog that are the building blocks of every custom engineered hot runner system we manufacture. Our standard is designed for 24/7 global product support and a long molding life.
Our patented self-clamping blue hot runner nozzle represents superior craftsmanship and better customer care
Precise, Reliable Performance
Quick access to the heater reduces machine down time. If a good heater is a replaceable heater, then the best heater is one that can be replaced very quickly, ideally within minutes while the mold remains in the molding machine. The key to this is a mold cavity plate that is designed so it can be temporarily moved to the core side of the mold, allowing it to be stripped clear of the nozzles. These are then easily accessible. Nozzles with permanently integrated or fused heater elements are not repairable. Once the heater is dead, the entire nozzle has to be removed and replaced. That means the entire mold must be taken out of the machine so the hot runner manifold can be disassembled. The replacement cost for the nozzle or spare heater, the labor and the production down time involved is substantial.
Replaceable nozzle heaters are as essential in an injection mold as replaceable spark plugs are in the engine block of your car. A particularly well engineered nozzle heater is one in which the heater housing or sleeve is self-clamping so that it tightens snug around the nozzle body as the heater warms up to reach a uniform nozzle set temperature. The heat distribution and heat transfer is enhanced by a highly conductive sleeve assembly that encases the nozzle body from head to tip. Sensitive plastic materials and additives with a narrow temperature processing window can be molded.
Quick Facts
· Smallest nozzle cut out - 16 mm
· Closest hot tip gate distance - 17.8 mm
· Closest valve gate distance - 17.8 mm
· Largest nozzle melt bore - 30 mm
· Largest nozzles - 1000 mm
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Valve Gating
Thermal Gating
Side Gating
The efficiency of a hot runner mold suffers when heaters fail and cause one or more cavities to loose productivity because of nozzle freeze off. There is no such thing as indestructible heater elements. In order to deal with this reality, replaceable nozzle heaters that can easily be serviced are a must. This may seem like a simple feature, but only advanced hot runner systems offer it.
It is impossible to see from the outside if a heater has been designed for longevity. The heart of all electrical resistance heaters is an internal nickel-chromium wire surrounded by compacted ceramic insulation material and shielded with a metal tube. Over time, the performance of the nickel-chromium wire will decline as it conducts electrical current and generates a certain wattage of heat energy for the nozzle. The inevitable aging process is more pronounced in thinner heater wires and higher watt densities because of the increased electrical resistance. (A general rule of thumb to determine whether a heater is close to the end of its lifetime is when its ohm reading deviates by more than 10 percent from the original value of the new heater.) The most durable heaters are made with a thicker nickel-chromium wire and a lower watt density. But even the most robust heaters can fail when the surrounding insulator allows a trip current or an electrical current leak due to moisture absorption or contamination. Good quality heaters are permanently sealed to avoid these problems.
The long term performance of a mold depends in large part on the quality of its heaters, which should be both reliable and easily replaceable. |
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Our Patented front replaceable Rheo-Pro® nozzle heaters are designed to reduce costly machine down time |
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