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RANDCASTLE’S
Blown Film Lines
1 TO 15 LAYERS
3 LAYER
2 EXTRUDER LINE
Patents: 5,486,328
5,518,672, and
5,569,429 other US
and foreign patents
pending.
Adjustable
height
tower
Table
mounted
extruders
Single lip
air ring and
expandable 3 inch
“pancake” style die
MONOLAYER BLOWN FILM LINES
INTRODUCTION: Randcastle blown film (less than 0.010 inch) extruders melt and pump the polymer through an
annular die. The film is drawn by the nip rolls as a bubble over low pressure air (inserted through the die) becoming
thinner as it is drawn. A blower supplies air to an air ring which cools the film. Our blown film lines make film from
about 1 to 18 inches wide making them ideal for research, development,and quality control applications.
TECHNOLOGY: Randcastle is a technology driven company focusing on small diameter extrusion 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 measure viscosity and you can link flow
and film properties. Our spiral dies remove weld lines yet are viscosity insensitive so you can process a much
broader range of materials and still make uniform film. Our single lip air ring converts into a dual lip rings just in case
your applications change. Randcastle towers include low friction collasping canopies and different style winders.
Compact bench or floor mounting saves space for all your lab applications.
DC Drive
BENCH OR FLOOR
MODEL DESIGNS
Floor model
tower is available
for horizontal
extruders too.
Adjustable
height tower
Winder
Low friction
collasping
canopy
Low friction
bubble
guides
Dual lip
air ring
(shown)
Spiral die
Blower
hoses
Extruder control
panel with nip
rolls and blower
speed control
This ‘dedicated’
blown film line is
extremely compact.
Mounting the blower
under the shroud
makes for quieter
operation.
MONOLAYER BLOWN FILM LINES
RCP-0625 MICROTRUDER WITH 0.625 INCH DIE
MAKES 3 TO 4 INCH LAYFLAT
Winder
Tower Controls
Collapsing
Canopy
Bubble
guides
Rheometer
Panel
Rheometer
Air ring.
Extruder Panel
This bench mounted line, complete with in-line rheometer, fits into a tiny 30 x 65 inch space. It can be equipped
with a compounding screw up to 50:1 L/D and four Recirculating mixers. Use a single heat history to make the
best films. The Recirculating mixer has been shown to make thinner films at lower temperatures.
RCP-1250 1.25 inch MICROTRUDER WITH 3 INCH DIE
Adjustable
height tower
High HP AC Vector Drive
This caster equipped floor mounted has a 10 HP drive for high torque applications. The low centerline extruder
places the tower at a convenient working height.
COEXTRUSION BLOWN FILM LINES
2 TO 15 LAYERS
2 TO 8 EXTRUDERS
EXPANDABLE PANCAKE DIES: The heart of a coextrusion blown film line is the die and lab dies must be
flexible. Unlike most lab dies, we evenly divide the flow for each material to form concentric layers. We designed the die
and base for expansion so a two layer line can be expanded to 15 layers and 8 extruders. Plus, the tiny footprint(see
drawing back page) saves valuable space. Remember, old spiral dies only work for a narrow range of viscosity. Your lab
applications may not stay in that range. Randcastle pancake dies assure uniform layering.
Features:
Dual Winders
AC Vector drives
Adjustable height tower
Expandable pancake die
ving
a
S
ce
!
Spa esigns
D
FOUR 1.25 INCH EXTRUDERS, 7 LAYERS, 4 INCH DIE.
World
record
holder!
3 EXTRUDER 5 LAYER LINE
6 EXTRUDER 11 LAYER LINE
Other Randcastle Lines
Randcastle lines are available from 1 to 15 layers with up to 8 extruder inputs. The drawings below show a sampling of lines
including a state of the art 11 layer blown film line. Call for information on our other lines.
Two 1 Inch
Microtruders
Four 1.25 Inch
Microtruders
Adjustable
Height Tower
Free Standing
Base
Blown Film
¾ Inch Dedicated Line
Sheet
5 Layer Bench Line
Coextrusion Blown Film
Six Extruder, 11 Layer Line
Sheet
Floor Model With Laminating Payoff
Compounding/Pelletizing
For more information on Randcastle’s line, contact:
Randcastle Extrusion Systems, Inc.
74 Sand Park Rd.
Cedar Grove, NJ 07009-1210 USA
Tubing
Up To Three Layers
Monofilament
Tele: 973-239-1150
Fax: 973-239-0830
email: kluker@mail.eclipse.net
Web Site: www.randcastle.com