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Abstract
The shrinkage that can be induced in strained thermoplastic fibres by heat or any other treatment that releases the temporary set or ‘frozen-in strain’ is investigated in detail. When the fibres are strained cold, the action of heat or steam merely causes a very pronounced increase in the rate of delayed elastic recovery, whereas, when the fibres are strained hot and cooled under strain, the strain is frozen-in and can only be released by heat or other treatments. The growth of permanent irrecoverable strain is also studied.