A continuous heat set line for setting yarn, having spaced-apart, elongate, tubular entrance and exit cooling chambers Interconnected by an elongate intermediate steam heat-setting chamber communicating therewith. The entrance and exit cooling chambers and the intermediate heat-setting chamber collectively define a single longitudinally-extending axis along the combined length thereof. Sealing heads seal the entrance and exit cooling chambers and the intermediate heat-setting chamber to a degree sufficient to maintain a pressurized condition within the heat-setting chamber. Ayarn conveyor extends through the pretreatment chamber for conveying the yarn through the entrance and exit cooling chambers and the heat-setting chamber. Atleastone piston and cylinder assembly moves sealing rolls into and out of position relative to each other, while Independently-operating springs urge the rolls together sufficiently to effect a seal.
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