Rotary Tablet Press Punch Vibration for Crack Prevention
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Solution Overview
Problem
Rotary tablet presses face issues with crack formation and inadequate fracture resistance in tablets due to inner tensions caused by air inclusion during the compression process, which existing methods fail to consistently address.
Innovation Solution
Incorporating oscillation generators to temporarily vibrate upper and lower punches between the filling and ejector stations, particularly at the compression and filling stations, to ensure homogeneous material distribution and prevent air inclusion, thereby enhancing fracture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional compression methods are used without oscillation, then the compression process is simple, but air inclusion occurs causing crack formation and inadequate fracture resistance
Solution Approach 1:
The patent applies mechanical vibration through oscillation generators that temporarily vibrate the upper and lower punches during the compression process. This vibration prevents air inclusion in the compressed material, thereby eliminating crack formation and ensuring adequate fracture resistance of the tablets.
Solution Approach 2:
The oscillation generators provide periodic vibratory motion to the punches during specific phases of the compression cycle. This periodic action ensures homogeneous material distribution and prevents air trapping, leading to consistent tablet quality and fracture resistance.
2Strength
If higher compression forces are applied to improve fracture resistance, then fracture resistance increases, but wear and sound emissions increase
Solution Approach 1:
By introducing vibration during compression, the patent achieves homogeneous material distribution and eliminates air inclusion, which allows for effective compression at lower forces. This reduces wear on the punches and dies while also lowering sound emissions from the compression process.
Solution Approach 2:
The patent changes the compression process parameters by superimposing vibratory motion on the conventional compression force. This parameter modification improves material compaction efficiency, allowing achievement of desired fracture resistance with reduced peak compression forces.
3Reliability
If oscillation generators are added to prevent air inclusion, then fracture resistance improves, but device complexity increases
Solution Approach 1:
The oscillation generators are integrated into the existing punch mechanism, providing vibratory motion directly to the punches during compression. This targeted application of vibration effectively prevents air inclusion and crack formation while adding minimal complexity to the overall device architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces crack formation, ensures consistent fracture resistance, minimizes tablet waste, lowers compression forces, and reduces wear and sound emissions, allowing for cost-effective production without the need for granulating processes.
Implementation Method 1
at least one oscillation generator is provided in the rotational direction of the upper and lower punches between the filling station and the ejector station that at least temporarily oscillates the upper and/or lower punches
Data Source
AI summary
The invention relates to a rotary tablet press comprising: a rotatingly drivable rotor, having a die plate comprising die holes and assigned to the die holes upper and lower punches, rotating synchronously with the die plate, whose axial movement is controlled by upper and lower control cams, having at least one filling station comprising at least one filling device for filling the die holes with material to be pressed, having at least one compression station disposed downstream of the filling station in the rotational direction of the rotor, comprising at least one pressing device which presses the upper and/or lower punches into the die holes when passing through the compression station in order to press the filled material in the die holes, and having at least one ejector station, disposed downstream of the compression station in the rotational direction of the rotor, comprising an ejector device for ejecting the pressed tablets in the die holes, characterized in that at least one vibration generator is provided in the circumferential direction of the upper and lower punches between the filling station and the ejector station that at least temporarily vibrates the upper and/or lower punches at least at the compression station and/or at the filling station and/or at least at an upper control cam and/or at least at a lower control cam.