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Plastic Machinery Data
Information Home Pages on
Recycled Plastic Lumber">
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Plastic Machinery Data
Information Home Pages on
Recycled Plastic Lumber, Plastic Lumber
Machinery, Plastic Composite Machinery, Recycling Equipment, Plastic Wood
Extrusion, Flow molding, How to Select Plastic Lumber
Equipment, Choosing Used Plastic Equipment,
Plastic Machinery Comparisons,
Comparing Twin Screw Extruders and Single Screw
Extruders and many other topics of interest in the Plastic Lumber
Field.
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Good used extruders for
sale:
CINCINNATI MILACRON MODEL CM65,
65 MM,
Conical counter rotating twin screw extruder. MFG. 1999 used less than
one year, New Barrel Unused set of extra screws, moly coated 50 HP DC
drive and motor 11 Zone Control Panel,
Click here to go to the recommended retailer of used plastic
machinery.
AMERICAN MAPLAN 100 MM Twin Screw
MFG 1989
22:1 L/D ratio New Barrel/Screw 4-99 Dorstener Gearbox
Compak SCR Controls Sterlco Temp Controls Electrically Heated Water Cooled
Starve Feeder AT Plus Instruments
Click here to go to the recommended retailer of used plastic
machinery.
CINCINNATI MILACRON
MODEL CM 111 111 MM Twin Screw 198 Conical Twin Screw Extruder, Motor & Drive, Starve
feeder, Rebuilt Vacuum Pump, Complete Control Panel with Digital controls.
Cleaned, painted and checked out.
Click here to go to the recommended retailer of used plastic
machinery.
EXTRUDER MPM 32:1 6" Standard Single
Screw
Gearbox Ratio is 20.9:1--Electric Heat, Air
cooled--Vented--Fincor Digital 150 HP DC Drive--Control Panel --Three Screws and
a Swing Clamp--Priced to sell
Click here to go to the recommended retailer of used plastic
machinery.
EAGAN SINGLE SCREW 24 3.5"
Standard Single
Screw 1974 **Refurbished** Electrically Heated, Air Cooled, 5 Brand
New Fans (Oct. 2002) Non-Vented Direct Drive DC Motor NEW Eurotherm 590 DRV DC
Drive - (Jan. 2002) 5 Barrel Zones, 2 Die Zones Barber Colman 7SH491103000 Temperature Controller ( Feb. 2002) **Price Reduced
Click here to go to the recommended retailer of used plastic
machinery. |
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Plastic extruders
Single Screw Plastic Extruders and Twin Screw
Plastic Extruders
How Plastic Extruders Work
Plastic extruders melt plastic granules and transform them various
products. Plastic extruders are but one components of a complete system
which is composed of several pieces of equipment and designed to make a
particular end product.
The following is the plastic extruders process.
Plastic polymers are fed into the Plastic Extruder barrel and processed on
single or a double screw. Plastic in the extruder is heated up to 400°F
(the temperature can change in function of the extruder type). The
extruder transports, melts, and mixes the granules all at the same time.
At the end of the first stage from the plastic extruders, the melted mass
will be pushed into the die, which shapes the molten plastic into the
desired shape.
After this the molten plastic is pulled through a calibration system,
which cools the part under vacuum by a belted puller. the finished
product is then cut to the desired length. Plastic extruders are but one
components of a complete system which is composed of several pieces
of equipment and designed to make a particular end product.
Sheet Extrusion Lines are used mostly for flat sheet and a
complete Plastic extruder sheet system is comprised of an extruder,
polish stand , pull rolls and winder or stacker.
The polish roll stand features three hard surface polishing rolls with
chrome plating, designed for heat transfer. Each roll is equipped with
an individual, water temperature control system.
Plastic sheet line
Shape Profile Extrusion Lines are used to produce products from
medical tubing to complex structural sections. The plastic is fed through
charging hopper into the extruder system where it is melted and mixed
and is then extruded by the screw into die forming head. Profile formed in
the head is passed onto vacuum calibrators installed on calibrating table.
Here the profile acquires the required dimensions and is cooled with water
to a temperature enabling it to be hauled off by the two belt puller with
variable speed. Profiles are cut to required lengths by a cross cut saw
and received by profile stacker.
Profile extrusion line
Foam Extrusion Lines consist of tandem and single extruder
systems for direct injection foam processing. They require a compliment
of down stream equipment including; air rings, sizing mandrels, pull rolls
, and winders.
Compounding and Recycling Lines This type of extrusion line is used
to convert plastic chips or powder into plastic pellets . A line consists
of a system for feeding, filtering, pelletizing and drying.
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Refurbished Lines: Cierra Industries of Auburn offers a service of
refurbishing used equipment. This allows the ability to offer a
combination of new and used equipment, resulting in cost savings while
maintaining high quality .
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Before Rebuilding |
After rebuilding |
Plastic Extruders
Definition: A Plastic Extruder is machine for
producing more or less continuous lengths of plastic sections. Its essential
elements are a tubular barrel, usually electrically heated; a revolving screw,
ram or plunger within the barrel; a hopper at one end from which the material to
be extruded is fed to the screw, ram or plunger; and a die at the opposite end
for shaping the extruded mass.
Plastic Extruders may be divided into three general
types—
SINGLE SCREW
Plastic Extruders
 Pressure distribution predicted for a
single-screw Plastic Extruder.
The family of
single-screw Plastic Extruders includes units with various diameter an a
single screw. These extruders are designed for the manufacture of pipes,
profiles, films and other goods from thermoplastics. They offer different gear
rations, engine powers and torques and several speeds, which enables an optional
selection of an extruder, suited to a particular application and plastic. A
single screw Plastic Extruder is typically more severe in its handling of
plastics and may result in more degradation than a twin screw
machine
Plastic Extruder for Pipe extrusion
For high
performance extrusion of pipes for gas, water, multilayer pipes, draining pipes
from such materials as HDPE, MDPE, LDPE, PP are recommended high torque machines
with grooved cylinders with relative length ratio L/D=30:1, equipped with high
power motors.Extruders with smooth cylinders are used for the processing of
engineering polymers such as ABS, PYDE PPO and for production of hoses from
plastified PCV; they are also applied when raw material properties are variable
(e.g. regrind) or production flexibility is of great
importance.
Plastic Extruder for Profile extrusion
Normally
for profile extrusion are used extruders with a relative length ratio L/D=25:1
with a smooth feeding area. Depending on the manufactured profile, extruders may
have different screw rotational speeds and motor powers (torques) from those
presented in the table.
Plastic Extruder for Film extrusion,
An
optimal solution seems to be application of extruders with garooved feeding
zones with relative length ratio L/D=30:1, fitted, especially in case of
recycling, with plasticizing units with degassing system (vented
extruders)
Twin-or Multiple Screw
Plastic Extruder
Twin-screw co-rotating Plastic Extruder
co-rotating twin-screw line offers the highest torque-per-free-volume
and the highest screw speed of any commercial available compounding
extruder. They are available in sizes ranging from 37 to 175
millimeters.
Twin-screw counter-rotating Plastic Extruder
The
counter-rotating, non-intermeshing system enhances feed acceptance, provides
superior distributive mixing, enables multistage feeding, and produces optimum
venting.
Kneader Plastic Extruder
For applications like carbon
paste manufacture where low shear, kneading action and high capacity are primary
considerations, kneader mixers have high throughput rates And
the material produced is a dense, uniform paste with little particle
degradation.
These machines posess segmented screws and barrel liners.
Hydraulically operated clam-shell barrel feature provides easy access for
clean-out or reconfiguration. A single manifold provides heating fluid
circulation for the segmented barrel jackets up to 300° C
 Pressure distribution predicted for a twin-screw Plastic Extruder . The arrow denotes the extrusion
direction.
If you have further questions please address them to
pvan123@aol.com.
Questions concerning equipment for plastic recycling equipment or plastic
lumber will be answered as soon as possible.
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