Live shaft rollers are rolls mounted in external bearings where the roll shafts (or journals) rotate with the roll. Because they can be mount in self-aligning bearings, live shaft rolls are capable of handling higher loads than comparable dead shaft idlers. Live Shaft Idler Rolls are generally used where the web or the environment challenges like high heat ovens or harsh chemicals can impact roll integrity or performance.
Dead Shaft Idler Rolls are rollers with internal bearings, designed to rotate around a stationary, dead shaft. Since only the roll shell is rotating, the dead shaft roll has a lower rotating inertia and with low friction bearings installed, dead shaft idlers are generally the best solution when a free turning roll is needed. Webex Dead Shaft Idlers have set the industry standard for over 25 years.
Each roll is designed for the optimum balance between heat transfer, minimal pressure drop inside the roll, correct fluid velocity and minimum temperature rise across the roll face. In fact, our designs process is so exact, we guarantee temperatures to within ±1°F across the face of the roll.
Webex heat transfer rolls are available in a wide variety of materials such as carbon steel, aluminum, stainless steel and alloy steel. We offer several coating and plating options to customize your roll to fit your exact application.
Webex often produces heat transfer rolls with ultra-tight tolerances of less than 100 millionths total indicator run out. Mirror finishing with optically-perfect, polished chrome plating is also available.
Using a sophisticated analysis program, Webex Engineers can determine:
Webex’s rugged bowed rolls provide effective web handling for the most demanding web converters — available in both permanent bow and adjustable bow models. Proven mounting solutions ensure ease of installation as well as extended versatility in web control. These precision bowed rolls are ideal for separation of slit webs, or the elimination of web wrinkles, slack edges and soft spots. Exceptional performance is evidenced in the even distribution of lateral web tension and vibration-free operation at all specified speeds.
Also referred to as a concave roll, reverse crown or bow tie roll, the reverse taper roll has a larger diameter at the outer edges and a smaller diameter at the roll centerline. The roll, as a result of its profile, creates a surface speed differential at each different roll diameter. The resulting tension differential, or higher edge stress, ultimately results in the material climbing outward toward the larger diameter edges of the roll.
To be effective the web and the roll must be in a state of traction and therefore, web tension and wrap angle are very important components to the effectiveness of reverse taper rolls. The amount of taper or crown depends on the application but generally is .0005" to .001" per inch, diametrical taper from the roll centerline to the edge. Reverse taper rolls are definitely the most cost effective web spreading devices. They have an advantage in that, even if they do not achieve the desired action, they can still be effectively applied anywhere in the line as general idler rollers.
These anti-wrinkle rolls can influence your web in various ways, including stretching it, spreading it or allowing the web to lay flat and simply not induce wrinkles in the first place.
These idlers are covered with a rubber elastomer and are precision machined with angled, outward spiraling grooves across the roll surface. There are different elastomers available for use, each with different physical properties such as solvent resistance, heat resistance and hardness. In addition, various groove patterns are available to meet your specific application needs. Our Customer Support Specialists can help you determine which elastomer and groove pattern is best for your specific application.
Grooved metal rolls are also often applied as wrinkle removal devices. Because there is no scientific reason that these should be effective, Webex engineers do not actively recommend the use of grooved metal rollers. However, we have many users in real-world applications that swear by the effectiveness of grooved metal rolls as wrinkle removal devices.
An Isoten Vacuum Roll pulls the web into intimate contact with the roll, increasing friction forces that help prevent web slippage. The result is a highly effective web control device that can handle much lower tensions and much higher tension differentials.
Vacuum Roll Options:
Webex is already known as the industry’s leading source of quality process rolls. But we’ve also designed and built sections around those rolls for over 40 years.
REM models have evolved over years of engineering unique slitter rewinder machinery. In 2010, REM was acquired by Webex. The acquisition immediately enhanced all aspects of REM engineering, manufacturing and service. While REM models each have basic design or construction platforms, most finished machines are produced with unique modifications to meet specific customer application needs.
Custom model alterations and design options go hand in hand with achieving the ideal machine at the lowest possible cost. Likewise, REM can apply previous platforms to stretch your machinery budgets when a custom, one-of-a-kind slitter rewinder is needed.
Repairing or refurbishing your rolls can help you enhance your web process without making capital investments in new machinery.
Properly refurbished rolls offer great results:
Get replacement carbon fiber bridge mandrel adaptors for hydraulic sleeve-style flexo presses without enduring the long lead times and premium pricing common with offshore press OEMs.
Webex uses the same in-house carbon fiber winding technology that produces our highly respected NimCor line of carbon fiber air shafts to make mandrel adaptors for flexo presses. Our engineering team will help duplicate the exact specifications of your original mandrel adaptors to manufacturer a high quality adapter that meets the exacting demands of today’s high speed flexographic presses.
Lightweight, precision balanced carbon fiber flexographic print cylinders decrease bounce between the print cylinder and impression drum so presses can run at higher critical speeds. As an alternative to steel or other metal print cylinders, lightweight carbon fiber cylinders also offer better ergonomics for an injury-free workplace.
With our in-house composite carbon fiber winding operations, each print cylinder is engineered specifically to your application. By varying the fiber types, resins and winding techniques, we can control your cylinder tube strength and stiffness – creating a cylinder designed to deliver excellent performance.
The demands placed on any roller can be quite different from system to system - even roll to roll. That's why we custom design all kinds of rollers to meet the demands of unique web handling and converting processes.
Our skilled technicians will manufacture your roll in-house with strict attention to detail. The entire process of machining, grinding, balancing and finishing is done at Webex. From cradle to crate, we do it all.
Perhaps your web is abrasive enough to scratch the surface of steel idlers. Or maybe the caustic vapors of your coating operation likes to pit and corrode aluminum rolls. And it wouldn't be unusual if your coated web was causing some trouble by sticking just a little too much to certain rolls in the line.
These are typical challenges where custom roll coatings and platings are used successfully every day to improve web handling. The real challenges, however, are much more numerous. Likewise, the custom solutions Webex has to offer are quite varied and unique.
We present here an overview of the more common coating and plating options used today. For professional assistance in selecting the best possible option, talk to our Customer Support Specialists. They have the experience and expertise to properly shape your decision.
Common Options Include:
From precision-fit journals to the gripping elements, NimCor air shafts are custom engineered to meet the exact needs of your application.
NimCor's special system of independent flanges provides maximum grip at all contact points along the core, achieving optimum torque. This unique design accommodates variations in the inside diameter of the web core, allowing the flanges to securely grip rolls of any continuously wound material to provide ease and speed in unwinding and rewinding. NimCor airshafts are built to exacting standards for years of dependable service.
NimCor auto-locking safety chucks provide added operator protection in all winding applications. Self-closing design secures shaft regardless of rotation direction. The safety shield improves operator safety while protecting bearings against dirt and debris.
Choose from rugged aluminum or heavy-duty steel clamping collars for secure mounting onto core bars or backstand spindles. The choice of pneumatic bladder material is based upon your application to provide positive, high-torque engagement without wear or damage to cores.
Air Mechanical Chucks
NimCor’s air-actuated mechanical core chucks are designed for heavy-duty shaftless applications where maximum torque is required. These rugged chucks are easy to mount and easy to use with convenient air valve access.
These torque-activated core chucks are made for continuous-duty shaftless applications. Perfect control when running heavy rolls with high brake torques. Constructed for long-term performance, these rugged chucks combine excellent gripping strength with trouble-free core insertion and removal.