MONOLAYER SHEET LINES UNIQUE TECHNOLOGY:

Randcastle is a technology driven company focusing on small width lines. We start with the patented Microtruder vertical screw extruder with screws up to four times stronger than the same horizontal extruders; they feed much better and surge far less. Our exclusive smooth bore feed sections give you unparalleled processing flexibility. Add the inexpensive on-line rheometer to measure viscosity and you can link flow and sheet properties. Three types of dies are available for sheet over 0.010 inches. Adjustable lip (2 to 4 inches) have an opening range between 0.010 and 0.090 inches. They are viscosity insensitive making uniform sheet with little intervention. Our flexible lip dies (6 to 16 inches) have a unique interchangeable manifold. Fixed manifold dies are built for a single viscosity. However, beyond a certain range, such dies (even with flexible lips) are incapable of making uniform sheet. Randcastle’s interchangeable manifold is an economical solution. Production dies from several manufacturers make superior sheet but take longer to heat and clean. Space saving bench models are made 8 and 12 inches wide. The 2 inch diameter rolls concentrate the force of the air cylinders. Floor sheet take offs are made with 6 inch diameter hardened rolls in 10, 16 and 20 inch rolls. Both bench and floor models have separately motor driven pull rolls for web tension control, hardened cored rolls, and optional winders. Floor models can mount roll temperature controls within the base.

COEXTRUSION SHEET LINES

The heart of a coextrusion sheet line is the feed-block or die used to assemble the layers. Randcastle multi-manifold dies share a short common flow path and are best where very large viscosity variations are expected and are limited to three layers. Randcastle multi-manifold dies feature the critically important interchangeable manifold. Dies without this feature may not have uniform layering even with a flexible lip. Randcastle feed-blocks are supplied as an economical unit for up to 5 layers and an expandable modular version so that you can add layers and extruders as your need expands. All our feed-blocks use modular flow pin technology to make uniform layers from different viscosity materials. Additionally, the modular feed-block lets you change pins without taking the feed-block apart.

COEXTRUSION SHEET LINES PHARMACEUTICALS

This production line made AB sheet for dispensing drugs from a water soluble polymers. These bench model 36/1 L/D Taskmasters directly compounded the drug into the polymer. The line features stainless steel components, FDA approved paint and lubricants. These one inch bench model Taskmaster extruders are 36/1 L/D with three patent pending Recirculator mixing elements to compound drugs into the polymer. The Recirculator elements also improved melting performance for a substantial reduction in pressure and the surge suppression characteristics provided remarkably stable pressures. The Taskmasters have high capacity fan cooling for precision temperature control, a pressure gage to optimize compounding, starve feeders and Randcastle’s unique feed section inserts. The extruders are shown connected to the stainless steel feed-block with exterior flow control pins to match flow velocity and compensate for viscosity differences between materials. See the following page for additional pictures of the line

Other Randcastle Lines

In addition to the sheet line, a sample of Randcastle products are shown in these drawings here. These include our exotic 11 layer blown film lines and state of the art 50:1 L/D compounders. Many other standard lines are available and new lines are constantly under development. We welcome calls for custom built machinery.

RCP-0750 with Bench Sheet Take Off

This sheet take off is small but powerful. The hardened rolls prevent worm tracking. The small diameter rolls concentrate the already powerful force generated by 3 inch air cylinders. Dual motors drive the stack and pulls rolls separately. A safety cable surrounds the stack and pull rolls. The hand wheel and die shape let you position the stack extremely close to the nip rolls for minimal neck in. Standard features shown: Bench mounted line, RCP-0750 3/4", Microtruder, 6" Die, Bench Sheet Take Off. Integral Control Panel including: FPM indicator, 10 turn pots, Field selectable torque or speed control for pull rolls, Gear rack positioning, Hardened rolls.