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Collapsible Cores – Intelligent Solutions for Complex Moulds.
Collapsible Core Technology
When precision meets innovation, efficiency follows.
KNARR’s collapsible cores are engineered to simplify complex mould designs, enabling the reliable demoulding of undercut or unscrewing geometries without the need for split cavities or additional side actions.
Every KNARR collapsible core is manufactured to exacting tolerances, ensuring smooth operation, long service life, and repeatable performance — even under continuous production conditions.
Designed for accuracy and stability, these cores guarantee clean release and excellent surface finish in the final moulded part.
Key Advantages
- Efficient demoulding of undercuts without additional mechanics
- Compact design ideal for limited space applications
- High precision and stability thanks to tight manufacturing tolerances
- Available in multiple sizes to suit a wide range of mould dimensions
- Durable materials and heat treatment for long-term reliability, DLC coating of wear parts where applicable
- Easy maintenance and replacement for reduced downtime
- Smart Toolmaking, Simplified
With KNARR’s collapsible cores, toolmakers benefit from a proven, space-saving solution that streamlines mould design and improves productivity.
Whether for threaded components, bottle caps, or technical mouldings, our collapsible cores deliver consistent precision, cycle after cycle.
What our clients say
We’ve used Gunther Hot Runner Systems, OptiMach special machining, and Knarr collapsible cores via Gunther UK for a number of years. The quality is always exceptional and the service is responsive and reliable.
New Tooling Manager
Major UK OEM
Gunther’s demonstrated technical knowledge allow us to confidently provide working, robust moulds that produce consistent parts. Delivering a quality product and incredible support are more important today than ever before, Gunther never fails to deliver this, which in turn helps us to provide the same service to our customers. I can’t recommend them enough.
UK Toolmaker/moulder
We’ve been working with Gunther UK since 1988, and they’ve never let us down. The combination of personal service, trustworthy advice, and consistently high-quality hot runner systems and mould components has cemented our relationship over three decades. They feel less like a supplier and more like a partner we can rely on.
Gary Statham
Neptune Injection
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