Multilayer Tablet Inspection via Selective Compact Removal

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Solution Overview

Problem

The stronger compression during the testing process of multilayer tablets in a rotary press alters the balance of forces and vibration behavior, leading to non-representative layer weights due to different filling patterns, which affects the accuracy of weight measurements in multilayer tablets.

Innovation Solution

The method involves only using compacts from die holes that were completely filled with the mth layer before the testing process, with the last layer being compressed more than usual, ensuring that only those compacts representative of normal operating conditions are tested, and using discharge switches to direct non-representative compacts to a reject channel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If stronger compression is applied during testing to facilitate ejection and prevent material accumulation, then ease of operation is improved, but manufacturing precision deteriorates due to altered force balance and non-representative layer weights

Engineering Contradiction:

Improveease of compact ejectionVSAvoidlayer weight accuracy

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The patent applies preliminary action by selectively removing the first layer compact before testing begins, ensuring that only compacts filled under normal operating conditions are tested. This prevents the contamination of test results by compacts that would be affected by the stronger compression forces applied during the testing process, thereby maintaining manufacturing precision while still facilitating ease of operation.

Inventive Principle:

Principle #10Preliminary action

2Ease of operation

If stronger compression is applied to the mth layer during testing, then ease of operation is improved by preventing material accumulation, but measurement precision deteriorates due to changed vibration behavior and non-representative filling

Engineering Contradiction:

Improveprevention of material accumulationVSAvoidweight measurement accuracy

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The patent applies the taking out principle by extracting and removing the first layer compact from the system before the testing process begins. This ensures that only compacts that were completely filled with the mth layer under normal operating conditions are subjected to testing. By removing potentially problematic compacts in advance, the system maintains measurement precision while still allowing stronger compression to be applied during testing to prevent material accumulation.

Inventive Principle:

Principle #2Taking out (Extraction)

3Ease of operation

If the testing process initiates stronger compression, then ease of operation is improved, but reliability deteriorates as test results become non-representative of normal production conditions

Engineering Contradiction:

Improvecompression force applicationVSAvoidtest result representativeness

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The patent applies preliminary action by removing the first layer compact before testing begins, ensuring that only compacts filled under normal operating conditions remain in the system. This preliminary removal action guarantees that subsequent testing with stronger compression forces does not compromise the reliability of test results, as only compacts unaffected by the altered force balance are tested.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent converts the potentially harmful effect of stronger compression during testing into a benefit by using it to facilitate compact ejection and prevent material accumulation, while simultaneously using the preliminary removal of the first layer compact to ensure that only representative compacts are tested. This approach allows the system to exploit the stronger compression forces for operational ease while maintaining test result reliability through selective sampling.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentEP2070692B1Method for inspecting multiple layer tablets

Publication Date: 2015.01.14 FETTE

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AI summary

The invention relates to a method for testing multilayer tablets in a multi-rotary press, in which die holes (12) of a rotating die disk (10) are successively filled with tablet material of different layers in successive filling devices, and the tablet material is compressed layer by layer into tablets with n layers by means of synchronously rotating press punches, and the tablets are subsequently ejected and removed in a removal station, in which, in a testing process, tablets with m layers are removed after compression in a respective removal station and fed to a testing station, wherein 1 <= m <= n, wherein, before the removal of the tablets, at least the m-th layer is compressed more strongly than during the normal production of the multilayer tablets, where m < n.According to the invention, it is provided that only tablets from die holes are fed to the test station which were already completely filled with the tablet material of the m-th layer before the start of the test process.