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CHOOSING THE CORRECT MOULDING SYSTEM
A crucial for any start up. The process must starts with the product to be
manufactured. Note down the weight, dimensions, thickness, material of make of
product. Determine the expected production required per month / day. Based on
company working hours back calculate the pieces required to be produced per minute.
From this, assuming 3-4 cycles per minute, No. of cavities required in mould to
achieve expected production is ascertained. The number of mould cavity will provide
for the total shot weight per cycle (No of cavities x weight of product + runner length).
Hence with above information one can choose the machine with appropriate shot
weight. Other consideration includes the tonnage required to compensate for the
filling pressures, which depends on the part thickness and product design - length,
undercuts and other features. Choosing wisely and scientifically from wide range of
options available for shot weight, tonnage , level of automations and energy savings
one can be assured of quality production economically in ones budget.
We at DAVE TECHNICAL SERVICES offers complete assistance for
machine selection, solutions for plastic product and mould development (from your
design, samples or concept), Production and setting up of entire plant and machinery at
your place for self production (Blow moulding & Injection Moulding Machine) with
training .
DTS offers Blow machine from 0.5 mls – 3000 mls and Injection machine from 20
gm-100 gms (vertical / horizontal models, direct / toggle types, hand mould/fixed moulds
machine models, single / 3 phase operations) Special models for Lab testing, prototypes,
Master batches chip moulding, educational demonstrations and R&D purpose.
Email : davetechnical@gmail.com ? Cell +91 9820606601
hardness, a galling action can occur where one metal is actually welded to the other
causing high and low spots where material is added or removed. The screw is
cantilevered in the barrel and is supported only at its shank and by the plastic in the
barrel and excessive contact between the two components will cause adhesive
wear and/or galling on the screw flight OD and the barrel wall.
Typical Causes of Adhesive Wear are Improper Screw Design, Incorrect screw
assembly, faulty component materials, inadequate screw support/centering, Shaft
deflection, Incorrect Heat Profile and Poor Manufacturing Workmanship,
Corrosive Wear: Erosion of metal surfaces due to chemical attack. Corrosive wear
causes pitting and usually occurs in the last few flights of the transition zone and in
the metering zone. The pits can collect melt, burn or degrade it and result in black or
burned particles in the parts. Plastics like polyvinyl chloride-PVC (which releases
hydrochloric acid), Acetals (formic acid), Fluoroplastics (hydrofluoric acid) and
Cellulosics (acetic, butyric and propionic acids) generate acids during its
processing at high temperature. In addition, flame retardants, coupling agents and
some foaming agents release acids, likw bromic and sulfuric acids which attack the
surfaces of barrels and screws.
Typical Causes of Corrosive Wear are Improper Component Materials & its
treatment, Incorrect Shut-down and Start-up, Inadequate Moisture Removal,
Excessive Residence Time, Incorrect Heat Profile. There are several causes of
wear, some of which can be prevented through the proper material, design and use
of the machinery components.

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