Roll Technology manufactures heat transfer rolls that provide temperature control by circulating fluid under the outer shell of the roll. Cooling & heating rolls, also named chill rolls, cooling cans, cooling drums and hot oil rolls are all Heat Transfer Rolls.
The fluid essentially cools or heats the rolls to the desired temperature for the application. There are different designs and configurations of the spirals within the rolls that can be critical to optimizing the performance of the heat transfer rolls.
Most heat transfers are double shell spiral baffle rolls (DSSB)- having an inner shell with a spiral baffle wrapped around it then either shrunk or slip fitted to the outer shell. Outer shells are thru-bored to create a uniformly thick outer shell and to enhance balance. Our chill rollers can introduce fluid via mono flow design (liquid in one end and out the other end), or a dual-flow design (liquid in/ out the same end).
Cooling/ Heating Process
Liquids used to cool or heat DSSB rolls may include but are not limited to are city/plant water, glycol, filtered water and various heating oils. The heated rolls can also be heated by using a cal rod or with an intricately designed chambered construction.
When manufactured properly, heat transfer rolls will maintain the temperature consistently within 1-2 degrees Fahrenheit across the face of the roll.
Fabrication & Materials
Roll Technology supplies heat transfer rolls using various materials depending on the specific application. Flame hardened 4140 and Stainless weld overlay are commonly used in plastic sheet extrusion or extreme wear applications. Other materials used are all grades of low carbon steel, all grades of Stainless Steel and occasionally Hastelloy for severely corrosive applications.
Hard Chromium Plated Chill Rollers
Many of the chill rolls supplied by Roll Technology are Hard Chromium-plated then finished to custom surface specifications. We electro-deposit Hard Chromium directly to the base metal without an underlying substrate such as copper or nickel. This becomes a “fusion bond” instead of a “mechanical bond” as with sprayed metal coatings.
In the plating process hydrogen is naturally absorbed in the chromium deposit and often needs to be baked out for hydrogen entrapment / embrittlement release and to prevent microcracking.
Chill Roll Capabilities & Features
Roll Technology offers a range of heat transfer dimensional capabilities, including:
- Up to 48’’ in diameter
- 200’’ in overall length
- 10,000lb in weight capacity
Tight Tolerance Standards
Tight tolerances are associated with heat transfer rolls when they are a part of the coating or an application system where temperature control other than ambient is critical to producing the web.
In those cases the standards that we meet are verified by electronic measurement devices including a Pro-Mic Roll Profile, Electronic Run-Out, Millionths indicators, Precision Snap Gauges from, Ultra-Sonic measuring, Electronic hardness measuring, Vernier calipers, Material Certifications, Calibrated micrometers up to 36” and Pi-Tapes up to 48”- all under controlled environmental conditions
Final Surface Finishes Available Include:
- Flawless Optical Mirror 0-1 Ra
- Dull Matte finishes
- Nodular Satin finishes
- Commercially polished surfaces
At Roll Technology, we are committed to supplying you with the highest quality heat transfer roll, manufactured, and finished to meet the most demanding and stringent requirements. Companies worldwide depend on Roll Technology’s expertise and high-quality surfaces for their web operations.