Single punch tablet press
The tablet press contains fallowing compartments
Ø Single punch tablet press is also called as a eccentric press or single station press
Ø It is most simplest machine for tablet manufacturing
Ø 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
• 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
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
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.
Tooling set:
Ø 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.
Ø The tooling set comprises of a pair of upper and
lower and a die cavity which is also called as station.
Ø Dies
that define the size and shape of the tablet.
Ø Punches
of compressing the granulation within the die.
Cam track guide the
position of the punches there connected to the head of the punches.
Ø The
mechanism involved in tablet press is that the compaction of powder blend is
accomplished by exerting the presser via
upper and lower punches
Ø The
resultant tablets are formed in the die cavity with their shape and size
Ø It
involves compression of only the
upper punch
Working
The process of tablet
compression can be divided into three stages
- Filling
- Compression
- ejection
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
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
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.
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.
Advantages :
Ø The machine
structure is rational and small,
Ø it s very to
operate, and it operates at a high utilization ratio.
Ø The machine
capable of utilize a high amount of pressure to reduce the weight difference
between the tablets while maintaining a low noise level
Ø The machine also provides a continuous control over
the loading of the raw materials, and the thickness of tablet.
Ø Each and every function of this machine can be
compared favourably with the imported machines.
Submitted by :Mr.Arun kumar.R , M.pharm.,
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