Sterlco SF1000 Gravimetric Additive Feeder - Manual (Page 4)

BF3-605 4
1.0 Introduction
Sterling SF-1000 is a single-component, gravimetric MB/ADD feeder for plastic injection-
molding machines.
During normal operation, the device controls the weight of the MB/ADD fed into the
injection machine with each injection shot, using the loss-in-weight method. By
continuously measuring the weight of the material in the additive hopper, the system
immediately detects any deviation from the preset MB/ADD weight, and automatically
corrects to the required dosing, by regulating the current (rpm) of the dosing-feeding
screw.
If required, the feeder can operate in “constant” (non-regulated) current mode: the motor
works at a pre-selected current (rpm), without being regulated by the controller according
to fluctuations in the batch weight.
The MB/ADD
is fed directly into the injection machine’s feeding throat through a
neckpiece adapter.
The Sterling SF-1000 can be delivered with 4 standard alternative screws, for low and
high dosing ranges. Selection of the correct screw yields very high accuracy.
The feeder is equipped with an integral Venturi loader, which automatically refills the
Masterbatch/Additive hopper whenever its contents fall below a predefined minimum
weight.
The feeder’s entire operation is automatically controlled by a powerful, sophisticated, yet
easy-to-operate control unit.
Important notes:
 This manual has been written to enable operators to use the machine correctly. Always
keep the manual at hand and always follow the instructions.
 The operator is completely responsible for the operating safety of the system, and
therefore all operators must have full knowledge of how to use it properly.
 Any use in a manner not specified in the user manual or any attempt by the user or
non-authorized personnel to disassemble or modify the machine shall render the
warranty invalid and the manufacturer shall not be responsible for any damage to
persons or property.
 The equipment must be installed only by skilled personnel who have read and
understood this manual.
 STERLING, INC. is not responsible in any way for the quality of the products produced
by the injection machine on which STERLING, INC. equipment has been installed.
Product quality is the sole responsibility of the customer.
 All technical data contained in this manual are the exclusive property of STERLING,
INC. Weighing and Control Systems Ltd. and must be considered as confidential.
Therefore no reproduction or publication of this handbook, or any part thereof, is allowed
without written authorization by the manufacturer. Moreover, this handbook shall not be
used for purposes other than those connected to installation, use and maintenance of this
equipment.