Blown Film Dies – with axial or radial spiral mandrel distributor For up to 13 blown film layers.


COLLIN offers mono blown film dies with axial or radial spiral mandrel distributor – depending on the desired expandability or application.

Multi-layer dies for 2 up to 13 layers are suitable for different numbers of layers. For these processes, COLLIN delivers dies with radial spiral mandrel distributors, moreover, different mandrels and matrix are available. The retrofitting between different layers can easily and quickly be realised – e. g. from 3-layer to 5-layer.

Axial spiral mandrel distributor blown film dies

  • Use: for mono-layer blown films
  • Standard die diameter: 25 mm to 100 mm
  • Due to the own design of the die geometry and the simulation of the flow in the die, also special dies for materials with difficult flow characteristics can be developed.

Radial spiral mandrel distributor blown film dies

  • Use: for multi-layer blown films
  • Layers: up to 13 layers, easy change between different layer configurations
  • Highest layer thickness constancy
  • High flexibility by easy retrofitting between different layer configurations
  • 3 different standard plates for different throughputs
  • Different mandrels and matrices are available



  • Raw material manufacturers
  • Compounding and refining companies
  • Processing companies
  • Universities and institutes
  • Pharmaceutical companies
  • Companies in the medical sector



Inner Bubble Cooling IBC (beginning with RWT 80)
Fully linear, continuous bubble diameter control (CBC), also available as retrofit, layer splitter for 1, 3 or 4 layers
High-temperature dies up to 420°C
Die design for special materials
Separate control cabinets for controlling up to 20 heating zones
Additional decoupling plates for thermal separation
Layer plates for integrating one or more coloured strips

Extrusion dies

COLLIN die spectrum & accessories:


Pipe & hose die

from 0.5 – 40 mm


Strand die

for 1 – 8 strands



Medical die

Up to 9 strands
e. g. for pharmaceutical strands or catheter hoses


Slot die

from 150 mm up to 2.5 m



Special die

Rotating dies up to 30 U/min


Cooling ring

for a homogeneous cooling airflow




For up to 13 layers


Multi-channel die

for multi-layer films with different material rheology