2. Introduction
Single punch tablet press is also called as a
eccentric press or single station press
It is most simplest machine for tablet
manufacturing
Single station tablet press employs a single
tooling station that is a die and a pair of upper
and lower punches
This tablet press is available as both manually
operated and power driven
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3. • In this single punch tablet press, the
compaction force on the fill material is exerted
by only the upper punch while the lower
punch is immovable such as action equivalent
to hammering motion
• TPM is approximately 60
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4. The tablet press contains fallowing
compartments
HOPER:
Hoper may be one or more in number
which serves two purposes
1.Firstly to hold granulated feed
2. Secondly to pass it to the feed frame.
For subsequent compressing the hopper can be
filled manually or by using mechanical
equipment
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5. FEEDING MECHANISM:
The feeding mechanism
helps in the guiding granulated feed from the
hoper into the die cavities.
In the single punch a feed shoe which is
connected hoper is laid down on die table.
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6. Tooling set:
The basic mechanical and functional unit of tablet
presses is the tooling set which compresses of die
cavity and a pair of upper and lower punches.
The tooling set comprises of a pair of upper and
lower and a die cavity which is also called as
station.
Dies that define the size and shape of the tablet.
Punches of compressing the granulation within
the die.
Cam track guide the position of the punches
there connected to the head of the punches.
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8. The mechanism involved in tablet press is that
the compaction of powder blend is
accomplished by exerting the presser via
upper and lower punches
The resultant tablets are formed in the die
cavity with their shape and size
It involves compression of only the upper
punch
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9. Working
The process of tablet compression can
be divided into three stages
1. Filling
2. Compression
3. ejection
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11. Filling:
The lower punch falls with in the die
leaving a cavity into which a particulate matter
flows under the influence a gravity from a
hopper. Through tablets are usually described
in terms of weight. The die is filled by
volumetric process
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12. Compression:
The upper punch, descends
,and its tip enter the die, confining the
distance separating the punch force
decreases, either by movement of upper
punch alone.
• The porosity of the contents of the dies
progressively reduced, and the particles are
forced into the over closer proximity to each
other.
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13. Ejection:
The upper punch is withdrawn from
the die and show the force being applied to
the tablet is removed.
• The effect of this might to be cause the
deformed particles to return to their former
shape, which would result in a decrease inter-
particulate contact and hence tablet strength.
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15. Advantages :
The machine structure is rational and small,
it s very to operate, and it operates at a high utilization
ratio.
The machine capable of utilize a high amount of
pressure to reduce the weight difference between the
tablets while maintaining a low noise level
The machine also provides a continuous control over
the loading of the raw materials, and the thickness of
tablet.
Each and every function of this machine can be
compared favourably with the imported machines.
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