METHOD TO RELIEVE STRESS IN CAPSULE SHELLS TO REDUCE PROPENSITY TO BREAK
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United States of America Patent
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Issued Date -
Jan 23, 2025
app pub date -
Oct 8, 2024
filing date -
Oct 8, 2024
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Abstract
A method of treating a hard capsule shell to reduce or alleviate stress or reduce the propensity for cracking in the capsule shell. The method includes a step of heating at least a portion of the hard capsule shell to a temperature above a glass transition temperature of the capsule shell but below a melt temperature of the hard capsule shell for a time sufficient to reduce internal stress in the hard capsule shell. The method can be used to reduce cracking of hard capsule shells by application of the heat treatment to the filled capsule shells after fabrication and filling.
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