Three-Zone Drying System for Hydrophilic Softgels
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Solution Overview
Problem
The challenge in drying softgels with hydrophilic fill materials is the lengthy time required, which can lead to irregular shapes and reduced structural integrity, decreasing manufacturing efficiency and product shelf-life.
Innovation Solution
A three-zone drying system with specific temperature, humidity, and dew point conditions (35-45°F, 15-22% RH, 0-8°F dew point in zone 1; 60-67°F, 9-14% RH, 0-16°F dew point in zone 2; and 68-74°F, 10-15% RH, 10-23°F dew point in zone 3) is used, along with controlled airflow, to dry hydrophilic softgels within 24 hours or less.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional drying tunnels are used to dry softgels with hydrophilic fills, then the softgels can be dried without structural damage, but the drying time becomes excessively long (5-7 days)
Solution Approach 1:
The drying process is divided into multiple sequential drying zones (first drying zone, second drying zone, third drying zone), each with progressively different temperature and humidity conditions. This segmentation allows the softgel to undergo controlled water migration at different stages, preventing structural damage while significantly reducing total drying time from 5-7 days to under 24 hours.
Solution Approach 2:
The patent applies systematic changes in drying parameters (temperature, relative humidity, dew point) across different drying zones. The first zone uses lower temperatures (35-45°F) and higher humidity (15-22% RH), while subsequent zones use progressively higher temperatures and lower humidity. This parameter progression enables controlled water migration from hydrophilic fill to shell without causing shriveling or structural damage.
2Reliability
If drying time is extended to ensure complete drying of hydrophilic fills, then structural integrity is maintained, but manufacturing efficiency decreases
Solution Approach 1:
By segmenting the drying process into multiple zones with optimized conditions, the patent achieves complete drying within 24 hours rather than 5-7 days. This dramatically improves manufacturing throughput and productivity while maintaining structural integrity through controlled water migration at each stage.
Solution Approach 2:
The multi-zone drying system operates continuously with softgels progressing through each zone in sequence, eliminating idle time and ensuring continuous water removal. This continuous action maintains structural integrity while maximizing manufacturing efficiency by preventing the need for extended single-stage drying.
3Loss of time
If rapid drying is applied to hydrophilic softgels, then manufacturing time is reduced, but the softgels develop irregular shapes and lose structural integrity
Solution Approach 1:
The first drying zone performs preliminary drying at lower temperatures (35-45°F) and higher humidity (15-22% RH) to prepare the softgel shell for subsequent faster drying. This preliminary action prevents structural damage by establishing a gradient that enables controlled water migration before exposure to more aggressive drying conditions in later zones.
Solution Approach 2:
The patent uses progressive parameter changes across drying zones to enable rapid drying without damage. The temperature increases (35-45°F → 60-67°F → 68-74°F) and relative humidity decreases (15-22% → 9-14% → 10-15%) in a controlled sequence, allowing water to migrate from hydrophilic fill to shell and then to the environment without causing shriveling or structural failure.
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 method significantly reduces drying time for hydrophilic softgels without causing structural issues, enhancing manufacturing efficiency and maintaining product integrity and shelf-life.
Implementation Method 1
water does not naturally migrate from the hydrophilic fill material towards the softgel shell, but rather tends to remain within the fill material (or even migrate from the shell towards the hydrophilic fill material)
Implementation Method 2
a series of drying zones and tumble driers... drying the softgel. The drying is complete within 24 hours or less
Data Source
AI summary
Provided herein are systems, methods, and processes for drying a softgel having a hydrophilic fill material and one or more active ingredients. After forming the hydrophilic softgel, for example, the softgel is dried by sequentially passing the softgel through a series of specific drying conditions, in which the first drying condition has a low temperature and low dew point. In certain examples, controlled airflow is also used to dry the softgels. By using the systems, methods, and processes, the total time to dry the hydrophilic softgel can be beneficially reduced from several days to about 24 hours without causing shriveling of the softgel.