PLASTIC TRADE INJECTION MOULDING OF ALL MATERIALS BY B.P.Y. PLASTICS   

Moulding Plastics - How is it done?
HOME Injection moulding is the process of forcing melted plastics into a 
SERVICES mould cavity. Once the plastic has cooled, the part can be
TEAM ejected. Injection moulding is often used in mass production and
PROFILE prototyping. Injection moulding is a relatively new way to
TESTIMONIALS manufacture parts. The first injection moulding machines were 
OUR RECYCLING built in the 1930’s.
LOCATION
CONTACT There are six major steps to the process:
UPVC FASCIA CORNERS & JOINTS 1. Clamping
PUB PROMOTIONS The injection moulding machine consists of three basic parts. 
GOLF CLUB TAGS The mould plus the clamping and injection units. The clamping  
PLASTICS IN THE CONCRETE INDUSTRY unit is what holds the mould under pressure during the injection
PRODUCTS PAST & PRESENT and cooling. Basically it holds the two halves of the mould tool
together.
PLASTIC MATERIALS
THE PROCESS 2. Injection
APPLICATION During the injection phase, plastic material, usually in the form of
GENERAL RECYCLING pellets are loaded into a hopper attached to the injection unit. The
USEFUL LINKS pellets feed into the cylinder where they are heated until they
reach molten form. Within the heating cylinder there is a motorized
tell a colleague about bpy plastics screw that mixes the molten pellets and forces them to the end of
the cylinder. Once enough material is accumulated in front of the
    screw the injection process begins.
      The molten plastic is then forced into the closed and clamped
mould by the screw and is controlled by speed and pressure.

BPY Plastics - Injection Moulding - The Process
3. Dwell
The dwelling phase consists of a pause in the injection process
(sometimes  called hold on time) the molten plastic has been
injected into the mould and the pressure is applied to make sure
all of the cavity is filled.
4. Cooling
The plastic is allowed to cool in the mould cavity, aided by water
cooling running through the mould.
5. Mould open
The clamping unit is opened, thus separating the two halves of the
mould tool.
6. Ejection
The mould tool is fitted with pins internally to push out the
moulding.

A Plastic Moulding Machine

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