Rotary Tablet Press Air-Jet Rejection for Single Tablet Sampling
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Solution Overview
Problem
Existing rotary press machines struggle with the inability to perform single reject and sampling of tablets at high operating speeds due to the mechanical limitations of their diverting elements, necessitating cumulative rejection and sampling, which is inefficient for quality control and verification of specific punch operations.
Innovation Solution
A rotary press machine equipped with pneumatic diverting means that use compressed air jets to selectively and accurately divert individual tablets into reject or sampling ducts, controlled by a sensor system to identify and act on each tablet individually, allowing precise single reject and sampling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mechanical diverting elements are used in reject and sampling systems, then the system structure is simple and reliable, but at high operating speeds only cumulative reject and sampling is possible, not single tablet selection
Solution Approach 1:
The patent replaces the traditional mechanical diverting element with a pneumatic ejection nozzle system. Compressed air jets are directed at specific tablets to eject them individually into reject or sampling ducts, eliminating the mechanical linkage limitations that prevented single tablet selection at high speeds.
Solution Approach 2:
The invention uses pneumatic actuators (compressed air supply) to control the diverting function. The ejection nozzle delivers controlled bursts of compressed air to propel selected tablets laterally into separate ducts, enabling precise single tablet rejection and sampling without mechanical moving parts.
2Ease of operation
If compressed air jets are used for diverting tablets, then single reject and sampling is enabled at high speeds, but the device complexity increases due to pneumatic control systems
Solution Approach 1:
The pneumatic ejection nozzle system serves multiple functions: it can eject tablets into the reject duct, into the sampling duct, or allow tablets to continue along the main path. A single pneumatic actuator with controlled air jet direction can perform reject, sampling, and pass-through operations, reducing the need for multiple separate mechanical diverting elements.
3Reliability
If cumulative reject and sampling is performed instead of single tablet selection, then the mechanical system operates reliably at high speeds, but quality control precision is reduced
Solution Approach 1:
The patent replaces the mechanical diverting element with a pneumatic ejection nozzle system. Compressed air jets are directed at specific tablets to eject them individually into reject or sampling ducts, eliminating the mechanical linkage limitations that prevented single tablet selection at high speeds.
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
Enables precise and economical single reject and sampling of tablets at high speeds, facilitating quality control and verification of specific punch operations, enhancing operational efficiency and accuracy.
Implementation Method 1
pneumatic diverting means (11, 12) which use compressed air jets to selectively and accurately divert individual tablets
Data Source
Figure 1~4
AI summary
A rotary tablet press machine (1) comprises a compression turret (2) rotating about an rotation axis (X) and including a die table (3) provided with a plurality of dies (4) arranged to receive a product to be compressed and to make the tablets (100); conveying means (5) for conveying the tablets (100) made by the dies (4) of die table (3) into an outlet duct (6); a reject and sampling system (7) configured to selectively divert established tablets (100) made by the dies (4) of the die table (3) into a reject duct (8) or into a sampling duct (9); the reject and sampling system (7) comprises first diverting means (11) configured to operate on single tablets to be rejected (100a) so as to divert them from the die table (3) towards the reject duct (8) and second diverting means (12) configured to operate single tablets to be sampled (100b) so as to divert them from said die table (3) towards said sampling duct (9); the first and second diverting means (11, 12) are configured to operate on the tablets (100) before said tablets (100) have left the die table (3).