Blow moulding inflates a heated parison or preform inside a cooled mold to form hollow plastic parts. Using HDPE, PP, PET, and multilayers with precision tooling, the process produces bottles, tanks, ducts, and packaging with controlled wall thickness and strength.
Blow moulding is a forming process used to produce hollow thermoplastic parts by inflating a heated polymer parison or preform inside a mould. In extrusion blow moulding, a continuous parison is extruded and captured between mould halves, then inflated with air to conform to the cavity. Injection stretch blow moulding uses an injection‑moulded preform that is reheated, stretched axially, and blown to achieve high clarity and mechanical strength—common for PET bottles. Typical materials processed include HDPE, LDPE, PP, PET, PVC, and barrier multilayer structures. Tooling consists of precision‑machined aluminum or alloyed tool steel or stainless steel moulds with optimized cooling channels, pinch‑off areas, blow needles, and venting to ensure uniform wall thickness and rapid cycle times. Process parameters such as melt temperature, parison control, blow pressure, stretch ratio, and cooling rate influence part strength, transparency, and barrier performance. Blow moulding is widely used for bottles, tanks, ducts, containers, fuel reservoirs, and lightweight packaging in automotive, consumer goods, food and beverage, and industrial applications.
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 MoreUddeholm Corrax is a precipitation hardening steel with a unique set of properties that makes it perfect for many demanding applications. The superior resistance against corrosion combined with a hardness up to 50 HRC and a simple heat treatment makes Uddeholm Corrax the obvious choice for long run series of aggressive plastics such as PVC. The chemical composition makes Uddeholm Corrax easy to process by Additive Manufacturing. Hence, it is also available as powder for Laser Powder Bed Fusion (LPBF) and Laser Metal Deposition (LMD). Benefits Very good corrosion resistance Flexible hardness of 34-50 HRC achieved by ageing No hard “white layer” after EDM
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 MoreAISI S7 is a shock-resistant tool steel known for its exceptional toughness, high impact resistance, and superior machinability. With its excellent combination of strength and wear resistance, S7 is ideal for mould-making and tooling applications requiring durability under extreme conditions. The steel is very clean and has a homogeneous microstructure. These features are achieved through strict processing control and a maximum sulfur content of 0.005%. Best Coatings Our DLC and PVD ultrafine coatings ensure enhanced part release and minimize demolding issues, perfectly supporting tooling that requires toughness and durability under high impact and wear conditions. Explore our coating guide to select the ideal solution for your tooling needs.
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