Hot runner systems deliver molten polymer through heated manifolds and nozzles directly to each cavity of an injection moulding tool. Suitable for PP, ABS, PC, PA and filled materials, they improve cycle time and quality in automotive, packaging, medical, and electronic injection‑moulded parts.
Hot runner systems are temperature‑controlled melt delivery systems used in injection moulding to convey molten polymer from the machine nozzle to individual cavity gates without solidifying. They consist of heated manifolds, nozzles, valve pins, heaters, and sensors that maintain consistent melt temperature and flow. Materials processed include PP, PE, ABS, PC, PA, POM, PET, and glass‑ or mineral‑reinforced compounds. Tooling design focuses on thermal balance, leak‑free sealing surfaces, precise gate control, and wear‑resistant components, especially for abrasive or high‑temperature polymers. Valve‑gated systems provide accurate filling, reduced stringing, and improved surface appearance, while open nozzles offer simplicity and high‑speed capability. Hot runners reduce material waste by eliminating cold runners, improving cycle times, and enhancing part quality. They are widely used in high‑volume applications such as packaging closures, automotive interior and exterior components, medical devices, consumer electronics housings, and multicavity moulds where consistent gating and high productivity are essential.
BÖHLER M310 ISOPLAST is a corrosion-resistant, martensitic chromium steel which, through electroslag remelting and optimization of the chemical composition, has a good homogeneity and a balanced hardness-toughness-corrosion resistance ratio.
Read MoreBÖHLER M789 AMPO is a newly developed maraging steel, which combines the mechanical properties of 1.2709 with the corrosion resistance of 17-4PH. This patent bending grade can easily printed without any preheating and achieves a hardness of about 52 HRC with a very easy heat treatment. Furthermore, this material shows an excellent polishability, which makes it the ideal choice for inserts with conformal cooling in plastic injection molding and in any other application where a high hardness and corrosion resistance is of need.
Read MoreBÖHLER N695 is a corrosion-resistant, martensitic chromium steel with a high carbon content and added molybdenum.
Read MoreUddeholm Mirrax 40 is a prehardened remelted stainless tool steel, supplied at 40 HRC. Uddeholm Mirrax 40 is produced using the electroslag remelting (ESR) process – an additional step in the steelmaking process that ensures very clean steel. Consequently, Uddeholm Mirrax 40 is capable of being polished to a very high surface finish. In addition, the combination of high hardness with high toughness results in a mould with good resistance to indentations and minimize the risk of unexpected failures, leading to a safer mould and a prolonged tool life. Benefits Lower production costs Fast tool making Excellent surface finish possible Less maintenance work Safe production
Read MoreUddeholm Tyrax ESR combines best in class toughness, corrosion and wear resistance. This grade was developed for molding of high performance plastics often filled with glass fiber reinforcements and additives like flame retardants. This matrix- based microstructure is designed to achieve a high-gloss surface by only a few polishing steps, dramatically reducing the tool lead time and enabling production of top quality plastic parts. Uddeholm Tyrax ESR can achieve a high hardness (up to 58 HRC) and is a suitable upgrade from AISI 420 ESR, AISI S7 and AISI 440C. Benefits good dimensional stability at heat treatment and in service even microstructure and small grain size good hardenability Uddeholm Tyrax is also available for Additive Manufacturing, powder for processing Laser Powder Bed Fusion (LPBF) and Laser Metal Deposition (LMD).
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