TYPES OF INJECTION MOLDING MACHINES
I am going to tell you that injection molding
machine are of basically four types, so four types of injection molding
machines are as Use in plastic
industries.
1) Plunger
type injection molding
2) Plunger - Plunger type injection molding
3) Screw plunger type injection molding
4) Reciprocating screw type injection molding
types of injection molding machine pdf
So, there are basically four types of
injection molding machines. there are
many more like rubber injection, metal injection, a vertical injection these
all comes under these categories.
So, let’s describe about all these types of
injection molding,
Plunger type injection
molding
let's starting with a plunger type injection molding
you can clearly see the mold, the cavity section and the core section. Now I am
going to tell you about the plunger and the hopper. The plunger is just above
the hopper so, charge the raw material
inside the hopper is attached with Barrel, which has some band heaters fitted
over it.
injection molding equipment
We set
temperature from that controller, close out the mold, fix the mold beneath the
nozzle tip, clamp the mold by gear
system by clamping the mold with the gears the plunger will move downward and
it will inject the material which has been melted inside the barrel into the
mold, this is done with some pressure some high pressure is needed to inject
that particular material in the mold.
this is plunger type injection molding machine
because a single plunger is using in this machine, that plunger moves back to
its original position after complete the injection process. After that the
material charge and the material which has been filled in the mold left for the
solidification, it’s also known as cooling, at that particular time the
material cools down, After that open the
clamp, open the mold to take out the product.
It’s a simple
method, it's used in small-scale industries for some small products, it's very
rare use oftenly these type of machines. it's quite simple method, the complete
working of our plunger type injection molding machine
Screw plunger type injection molding
Screw
plunger type injection molding and plunger- plunger type injection molding are
quite common, Both types injection molding
machine in above image, in this type of machine there are two chambers,
one chamber is to plasticize the raw material
and another chamber is used for injecting the material inside the mold,
so upper section consists of plasticizing chamber in which the hopper is
attached the material which is inside the hopper is transmitted in the
plasticizing chamber and then the plasticized material will be transmitted to
the injection plunger area (another
chamber) then injection plunger will move forward and the material will be
filled inside the cavities of the mold.
injection molding technique
The screw is rotating and the material which
is being plasticized has been accumulated
in the injecting chamber, the mold closed and has been clamped, the
material is being charged from the hopper to the barrel in the barrel section
there is a screw which is rotating and along with a screw the barrel consists
of some band heaters band heaters along with screw they both helps in plasticizing the raw
material this melted raw material move toward another chamber which is called
the injection chamber in that injection chamber there is a plunger which moves
forward and the raw material which is in melted form is being injected inside
the mold.
Plunger-Plunger type injection
Quite simple
similarly the function for plunger-plunger type injection molding machine is
same instead of a screw which is in the plasticizing chamber there is a plunger
and heaters used for plasticizing
plunger type injection molding machine and a screw plunger type
injection molding machine the functions of both the machines are quite similar
but the result and efficiency of a screw plunger type machine is more efficient
than plunger type injection molding.
In plunger
type injection molding machine the raw material is plasticizes by heaters the
band heaters which are being attached over the barrel and then the plunger
moves that raw material into the injection plunger chamber and then what happened that injection plunger
moves forward and the entire plasticized
material is injected inside the mold.
Reciprocating type injection molding machine
now you can clearly see the heating elements
are attached to the barrel, Inside the barrel there is a reciprocating screw,
that this is known as a reciprocating screw that's,
Why the name
of machine is called reciprocating screw type injection molding, The reciprocating screw is divided in three zones
which are,
1) Feed zone
2) Transition
zone
3) Metering zone
In feed zone
the material is transferred from the hopper to the barrel, next is transition
zone also known as compression Zone, the material is being compressed and third
is metering zone in front of the screw there is an NRV which prevents back flow of material that it do not return
back inside the barrel at the time of injection.
injection molding machine parts and function
The charging material from hopper to barrel but while rotating the screw backward
the material is being charged And filled barrel with the plasticized raw material
materials are basically in the granules form, after that injection process,
before injection close the mold, the mold is being closed by the clamping system either it is
toggle ram or fully electric, the mold is closed mold consists of some cooling
system, we cool down the mold with mtc mold temperature controller or with the water system called cooling tower.
This is a
simple cooling system, inject the plasticized raw material which has been
accumulated inside the barrel inject -
material inside the mold simple method the screw will move forward the reciprocating
screw will be moving forward and the material
is being accumulated over the tip of the screw, material is being injected inside the mold
this process is done with high pressure.
This is the most common and efficient machine
used in the plastic industries of injection molding the high efficient machine and
high earning machine. the screw will move backward at that particular time the
dosing will start dosing means the
charging of material from barrel - hopper and then - plasticize that material
now the part is being ejected.
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