Carbon Fibre Expanding Core Shafts
DLB-2000 Carbon Fibre Expanding Core Shafts (for unwind and rewind applications) CF-1000 Carbon Fibre Through Shafts (Non-expanding core shafts are available for through-roll support using air chucks)	Carbon fibre core shaft housing provides the strength of steel at a fraction of the weight. Housing sleeved in metal to protect against abrasion. Special corded polyprene bladder expands with air to grip core ID. Robust bladder material reduces bladder failure and minimizes maintenance. Deep journal insertion and a close tolerance fit ensure easy access when necessary. Comprehensive two year warranty even includes bladder.
Metal Expanding Air Shafts
	The core shaft has an air-activated internal bladder which forcse gripping lugs to grip the inner core diameter. Proprietary corded polyprene bladder material resists puncture to reduce maintenance. Long, two-year warranty includes bladder.
DG-2000 Expanding Core Shafts in Steel or Aluminum (for unwind and rewind applications)
External Element Strip Core Shafts
	Simple clamping unit secures bladder assembly for easy maintenance. Durable hard rubber gripping elements offer excellent core grip. Rugged Teflon strip protects bladder from damage. Brass air valve will not corrode.
SR-2000 Strip Core Shafts (for multiple slit rewind applications)
Pneumatic/Mechanical & Mechanical Expanding Core Shafts
	For heavier roll weights and/or faster line speeds. Independent lug action accommodates core variations. Concentric expansion minimizes roll bounce; fail-safe operation guarantees roll security during production.
Pneumatic/Mechanical and Fully Mechanical Core Shafts (for high-speed and/or heavyweight winding applications)
Differential Rewind Core Shaft
	Delivers uniformly wound rolls, even with narrow and/or varying slit widths. Works in low or high tension applications. Individual bladders provide friction for gripping, but never create core dust – contamination is minimized.
Differential Rewind Core Shafts (for multiple slit differential rewinding applications)
Carbon Fibre Expanding Reel Spool Core Shaft
	Much lighter in weight than expanding steel shafts; requires far less driving energy. Carbon fibre housing allows faster critical speeds without increasing core size. Pneumatic/mechanical system ensures true concentric expansion.
RS-2000 Expanding Carbon Fibre Reel Spool Core Shaft (for reel spool winding applications)

Core shafts are used throughout the converting and packaging industries to unwind and rewind web material. These core shafts usually expand to grip the inner diameter of a core to help control web tension. They are commonly known as expanding shafts or air shafts, but can also be called air bars, air mandrels, bladder shafts or lug shafts.

Whether you call your core shaft an air bar, an expanding mandrel, or a winding shaft, rest assured that Double E offers the right core shaft for your converting application.