Summary

DF-2000 Torque-Activated Core Chuck

Automatic Concentric Expansion

As the torque chuck expands to grip a core, it automatically lifts and centers the roll, eliminating roll bounce and vibration.

No Lubrication ~ Minimal Maintenance

Little dust accumulation in the chuck means no jamming and easy removal of cores

No Sidearm Force Needed from the Roll Stand, Multiple Core Re-Use, Elimination of End-of-Roll Waste

The DF-2000 chuck grips harder as more torque is applied. Other chucks rely on sidearm force from the roll stand to push the gripping elements into the core wall. These chucks damage the core and waste material at the end of the roll.

Custom machined mounting flange adapts core chuck to any roll stand
Teflon thrust washer helps to ensure free movement of chuck
Central hex
Smooth gripping jaws with large surface area provide no-slip grip on any core material without damaging cores
Rollers travel on hex cams with little friction to provide free expansion of jaws. Jaws grip effectively in light or heavy tension applications
Roller cage
End cap
Socket head cap screw

Features, Advantages and Benefits

FEATURE	ADVANTAGE	BENEFIT
Smooth Gripping Jaws	Interior wall of core is not damaged.Serrations are not used so dust is not created	Multiple core reuseNo maintenance or jamming, no contamination.
Torque Activation	Extreme sidearm force not necessary	Less core distortion and no end of roll wasteRolls won't bowLess roll stand fatigue; extended roll life
Patented Roller Design	Reliable grip regardless of torque magnitudeTrue concentric expansionLubrication isn’t needed; dust won’t accumulateLittle friction inside chuck; less wear on partsWide range of expansion	Run heavy and/or light rolls with any tensionRoll bounce is minimized or eliminatedEasier to control web tensionNo jamming; chuck won’t get stuck in coresLittle, if any, maintenance and longer chuck lifeRun butt rolls and rolls with core inconsistencies
Step Chuck	Single chuck can run various core sizes	Roll changes are effortless; even between sizes
Quick Disconnect Chuck	Interchangeable chucks mount to same plate on machines with width limitations	One center bolt allows quick changes to various core sizes

Product Information

The Double E Group DF-2000 Torque-Activated Core Chuck

Double E Group's DF-2000's patented torque-activated shaftless design has made it the world's most effective and best-selling shaftless core chuck. Six precision-ground steel rollers are mechanically linked to travel up and down bi-directional ramps created by the back of the jaws and the hexagonal cam. This rolling action minimizes friction while causing expansion and retraction of the chuck’s jaws.

As a result, the chuck can be used in the lightest to heaviest tension applications. The chuck’s mechanical design eliminates the need for the sophisticated and expensive plumbing associated with pneumatic or hydraulic chucks. Rotary unions are also unnecessary with the DF–2000.

There are other chucks which are based on the torque-activated principle, but they use “sliding friction” inside the chuck for expansion. These chucks can’t overcome the friction created by the roll weight to lift and center the roll. A non-centering action results, causing roll bounce and possible jamming. Furthermore, their serrated jaws damage cores and create dust, leading to higher maintenance and more downtime.

DF-2000 "Extreme" Core Chuck

Greatest structural & load bearing capacity of any corrugator roll stand chuck: 14,000 lbs. / 6364 kg
Longest warranty or any core chuck on the market: 36 months.
Load capacity is determined by the outside diameter of the center cam / carrying beam at the base of the chuck. The DF-2000 Extreme center cam diameter = 2.585'' / 65.7 mm. Absolutely the largest & most durable center cam / carrying beam in the corrugated chuck industry.
Greatest safety factor of any corrugator chuck: Due to its 2.585'' / 65.7mm, ultra-high capacity center cam / carrying beam.
Greatest torque capacity of any corrugator chuck (by far): 13,750 inch-lb. / 1554 Nm. The DF-2000 Extreme features expansion jaws with the largest "contact patch or touch" on the inside surface of a core.
Greatest resistance to core tear out, slippage, & burn out due to the Extreme's industry leading contact patch.
Larger & longer center cam / carrying beam, rollers, & jaws.
Longest lasting corrugator chuck available, due to lower stressed internal parts. Larger, longer parts lower contact stress by spreading the load (roll weight) over a larger & longer area.
Greatest expansion: 4.26'' / 108.2 mm.
Best corrosion resistance: nickel plated.
Factory parts & service available globally.
Massive / comprehensive parts inventory. All Extreme chuck parts are in stock & available for next day shipping.

DF-2000 Step Torque Chucks

Ideal for applications that require the use of multiple core sizes and where roll stand width capacity is not a concern.
These core chucks can be any size with the base chuck being the largest.
Step chucks incorporate all of the features of normally mounted DF–2000 chucks with the top chuck mounted on the base chuck in a "quick disconnect design.
Top chuck may be swapped with any other size in a few minutes. If only two core sizes are being used, there is never a need to remove the top chuck.

DF-2000 Quick Disconnect Torque Chucks

Quick core chuck changes among a variety of core sizes.
Specially designed to be swapped on the fly, between rolls if necessary, with a single center bolt.
An adapter plate is required for mounting.
Best applied where roll stand width capacity is limited and changes of core sizes are frequent.

DF-2000 Slide-On Chuck Adapters

Core chuck adapters are available in cases where multiple core sizes are used and quick changeovers are needed.
Roll weights are limited to the base chuck specifications.

DF-2000 Core Kicker Chucks

Automatic core ejection system.
This “Core Kicker” features a core ejection device which kicks the core off the chuck as the roll stand opens.

DF-2000 Through-Shaft Torque Chucks

For core sizes larger than three inches. (DF-1000 chucking systems for 3-inch cores).
Chuck offers the same characteristics as all DF-2000 chucks, but mounts on a through-shaft in shafted applications.
The opposite end of the roll is supported by a retractable roll collar.