Features    Functionality    Software    Specifications    Options

Raw Data Plot    Compaction Profile    Force-Thickness Plot    Dwell Time 

 

New Product Announcement: Bi-layer Presster

Demonstration and inspection (via Skype or in person) can be arranged. Click here for more information.  


Presster is more than a Compaction Simulator. It is a Linear Mechanical Replicator of any Rotary Tablet Press.
It will allow you to  to easily test any formulation under high speed manufacturing conditions, one tablet at a time, using a very small amount of powder. The system has a full spectrum of scientific tools necessary to optimize and scale-up tablet formulations: compaction and ejection profiles, elastic recovery, Heckel analysis, take-off forces to study sticking, adhesion, capping and lamination. All reports and graphs are in MS Excel format. 
  • It is a tablet press replicator designed to match compression force and dwell time of any press.

  • It is a compaction simulator designed to mimic a punch displacement profile of any press.

  • It is a high-speed single station tablet press with standard tooling.

  • It is a powerhouse computer for compressibility profiles, Heckel plots, lubricant studies, etc.

 

The Presster™ Features are:

The Presster™ Functionality:

  Under computer control the Presster™ will

The Presster™ Software:

 
  • Mouse / menu driven under Windows
  • Produces reports and plots in the Excel (raw waveforms, analytical graphs, and statistics for all tablets made).
  • Provides the means for comparing different compressibility profiles or Heckel plots, e.g. superimposing the current profile with previously collected graphs.
  • Has a comprehensive context sensitive on-line help.
  • Prints on demand any screen graph, report or display on the color printer.
  • Full control of the Presster hardware

 
 
 

Presster™ Standard Specifications:

Maximum compression force 50 kN
Maximum precompression force 10 kN
Maximum depth of fill 17.4 mm
Maximum tablet thickness 8 mm
Tooling TSM/Euro, B type, any shape and size (D type is optional)
Die OD 1.1875"
Number of stations 1
Maximum punch velocity
(in horizontal plane)
2.2 m/s
Minimum dwell time 5.8 ms
Minimum punch velocity
(in horizontal plane)
0.055 m/s
Maximum dwell time 230 ms
Die feeding manual or force feed shoe
Maximum output 2 tablets / minute
Drive motor nominal speed 1800 RPM
Drive motor power 7.5 HP
Electricity requirements 208-220 V, 3 phase,

40 A, 50/60 Hz

Pressure rolls diameter 7.5" - 14" (user specified)
Machine installation on casters
Machine base width (standard) 103"
Machine base depth (standard) 32"
Machine height (standard) 83.5"
Machine weight (approximately) 2.5 tons (25 kN)
Computer Pentium IV 1.3 GHz Industrial
Printer HP Color
Standard Instrumentation measurements Upper compression force
Upper punch displacement
Lower punch displacement
Compaction speed
Optional Instrumentation measurements

Ejection Force

Lower compression force
Upper pre compression force
Lower precompression force

Take-Off Force
Radial die wall pressure

 

   Presster™ Options:

  • Additional instrumentation: lower compression force, ejection force, take-off force, radial die-wall force.
  • A variety of compression and precompression rolls to the exact diameters of the specified production presses.
  • Additional functionality: Precompression event and force measurement, variable ejection cam angle.
  • Integrated 4-way tablet tester (weight, thickness, diameter, and hardness measurements).
  • Validation Protocol, including IQ / PQ testing and all relevant documentation.
  • IPT D Type or any custom type tooling
 

 

Dwell Time Calculations for Scale-Up of Tableting Process

To compute a dwell time for any press, we use the following formula:

DT (msec) =

PHF NP 3,600,000

π PCD TPH

Where PHF = 12.7 mm (Punch Head Flat of the TSM-B )

NP = Number of Stations

π = 3.141

PCD = Pitch Circle Diameter of the turret

TPH = press speed in terms of Tablets Per Hour

The following graph represents the dwell time ranges for different R&D and production presses. The fastest presses, such as Fette, can achieve dwell times of about 5 ms. All high speed production presses are normally run at dwell times well under 10 ms. This is well within the range of a Manesty Betapress or MCC Presster™, but other research presses such as Korsch XL100 or Riva Piccola do not compare. Presster™ can reach the dwell time of 5.8 ms (as calculated on the basis of 12.7 mm PHF).

 

Linear Speed Comparisons for Rotary Tablet Presses

To avoid any misunderstanding regarding the dwell time definition, it is best to compare ranges of press speeds in terms of linear speed in horizontal plane. The following graph makes such comparison clear. Note that typical production ranges of linear speed are between 1500 to 2000 mm/s.

 

It is the linear speed (rather than the changes in dwell time at the same speed, e.g. by changing tooling geometry) that has a demonstrated effect on compaction process for strain-rate sensitive products.