Technique used downstream of the Extruder to assist in forming the correct shape and size of Extrusion. Vacuum sizing is normally used where complicated Profiles are required (such as window profiles) or to avoid deformation of Extrusions before they set into their final shape. Vacuum sizing may also be used where Tubing with a close-tolerance on the outside diameter (such as pneumatic tubing) is required.
Vacuum sizing works by feeding the still molten extrudate through a sealed chamber in which a vacuum is being drawn. The extrudate passes through a series of vacuum sizing bushes or plates and is formed into it's final shape before cooling. Cooling in the vacuum bath may be using water or air.
Apex GB have over 20 years experience in manufacturing Plastic & Rubber Extrusions, Extruded Profiles and Tubing. We're quite rightfully proud of our reputation for consistently meeting the needs of customers over that time. Because we've remained small and focussed we've also remained more attentitive, more cost effective and more responsive than larger manufacturers.