Tablet Coating Pan Coater with Integrated High-Humidity Curing

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Solution Overview

Problem

Existing tablet coating systems face challenges in maintaining high humidity conditions required for certain polymer materials, leading to defects like picking, sticking, erosion, and frosting, and require additional curing steps that increase production time and cost due to the need for separate high-humidity chambers.

Innovation Solution

A recirculating air handler is integrated into the tablet coating system to supply high humidity air flow, maintaining relative humidity up to 90% and temperature between 50° C to 80° C, while preventing condensation and maintaining subatmospheric pressure within the pan coater, allowing for high humidity curing without transferring tablets.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If high humidity conditions are applied for curing certain polymer materials, then coating quality is improved, but coating defects such as picking, sticking, erosion, and frosting occur due to inadequate drying

Engineering Contradiction:

Improvecoating qualityVSAvoidcoating defects

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The system implements periodic action by alternating between high humidity curing phases and low humidity drying phases within the same pan coater. The controlled environment allows the process to cycle between these conditions, enabling the coating to cure properly without developing defects from continuous high humidity exposure.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system applies parameter changes by dynamically adjusting humidity and temperature parameters during the coating process. It transitions from low humidity conditions during application to high humidity conditions during curing, then back to low humidity for drying. This parameter modulation resolves the contradiction between needing high humidity for quality and avoiding it to prevent defects.

Inventive Principle:

Principle #35Parameter changes

2Manufacturing precision

If coated tablets are transferred to a separate curing chamber for high humidity curing, then desired coating properties are achieved, but production time increases and mechanical damage occurs

Engineering Contradiction:

Improvecoating propertiesVSAvoidproduction time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The system merges the curing function into the existing pan coater by integrating a controlled environment system that can generate high humidity conditions. This consolidation eliminates the need for a separate curing chamber, allowing tablets to be cured in-place without transfer, thereby reducing production time and minimizing mechanical damage from handling.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The pan coater is transformed into a multi-functional device that can perform coating application, high humidity curing, and drying all within the same chamber. The controlled environment system enables the pan coater to universally handle multiple process steps that previously required separate equipment, improving efficiency and reducing tablet handling.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Productivity

If low humidity conditions are used for rapid solvent evaporation, then coating application efficiency is improved, but high humidity curing requirements cannot be met

Engineering Contradiction:

Improvecoating application efficiencyVSAvoidcuring requirements

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The system uses periodic action by switching between low humidity mode during coating application (for rapid evaporation and high productivity) and high humidity mode during curing (to meet manufacturing precision requirements). This temporal separation of conditions allows both productivity and curing quality to be optimized at different stages of the process.

Inventive Principle:

Principle #19Periodic action

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 solution enables high temperature and high humidity curing within the existing pan coater, enhancing tablet quality, reducing production time, and minimizing costs by eliminating the need for separate curing chambers and reducing mechanical damage and exposure to undesired conditions.

Implementation Method 1

a humidifier to introduce moisture into the air flow in an amount resulting in a relative humidity in the air flow of up to about 90%

Methodology Applied

Scientific EffectHumidification: Evaporation

Implementation Method 2

The vent valve may be opened as needed to maintain the pressure within the pan coater to at least 0.15 inches of water column below atmospheric pressure

Methodology Applied

Scientific EffectPressure control: Depressurisation

Implementation Method 3

maintaining relative humidity up to 90% and temperature between 50° C to 80° C

Methodology Applied

Scientific EffectHeating: Heating

Data Source

PatentUS11077024B2Systems and methods for high humidity curing within tablet coating system

Publication Date: 2021.08.03 SPECGX LLC

AI summary

The disclosure encompasses systems and methods for performing high temperature and high humidity curing of tablets using air flow delivered from a recirculating air handler to a pan coater of a tablet coating device. The recirculating air handler may be integrated into a preexisting tablet coating device so that the air flow may be delivered by the preexisting air handler or by the recirculating air handler as desired.