Processing Machinery
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Batch-to-batch differences in water dissolution rate of PEOX film
Problem Phenomenon
PEOX water-soluble packaging film has large differences in water dissolution rate between different batches (the difference can reach 50%), resulting in unpredictable use by users and jamming of automatic packaging equipment.
Cause Analysis
Differences in PEOX molecular weight between batches (Mv±20%) lead to different dissolution kinetics; uneven film thickness (±15%) affects the mass transfer rate between water and film; differences in film crystallinity (inconsistent cooling rate) affect the penetration rate of water molecules; residual catalyst and salt in PEOX affect dissolution.
Solution
Require PEOX suppliers to provide a molecular weight batch-to-batch consistency guarantee (within Mv±10%); online monitoring and control of film thickness (within ±5%); precisely control the film cooling rate to ensure consistent crystallinity (use cooling water at constant temperature ±0.5°C); sample the finished film to test the dissolution time and disintegration time in water to establish release standards.
Key Takeaway
Batch consistency of the water dissolution rate of PEOX film requires precise control of the entire process from raw material to finished product.
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