Method and apparatus for stuffer box crimping a yarn
AssigneeBarmag AG
InventorManfred Mayer
Life of this patent
Estimating the term…
Abstract
A method and an apparatus for stuffer box crimping a spun multifilament yarn, wherein the yarn is packed in a crimping device to form a yarn plug. After cooling the yarn plug, it is unraveled into a yarn. In so doing, the position of the unraveling point is adjusted by varying the withdrawal speed of the yarn. At the same time when the withdrawal speed is varied, a signal is generated for controlling at least one of the parameters of the crimping device, which influences the formation of the yarn plug, so that it is possible to produce a uniformly crimped yarn.
Claims16
A method of stuffer box crimping an advancing multifilament yarn comprising the steps of
- feeding the yarn into a crimping device to form a yarn plug and then cooling the yarn plug within a cooling zone,
- withdrawing the yarn from an unraveling point of the yarn plug adjacent the end of the cooling zone, with the position of the unraveling point being adjusted by changing the withdrawal speed of the yarn, and
- upon a change of the withdrawal speed, generating a signal for controlling at least one of the parameters of the crimping device so as to influence the formation of the yarn plug.
An apparatus for crimping an advancing multifilament yarn comprising
- a crimping device for receiving the advancing yarn which is fed thereinto by a yarn feeding device, and which forms the yarn into a yarn plug,
- a cooling device downstream of the crimping device for receiving the yarn plug,
- a yarn withdrawal device having a drive for withdrawing the yarn adjacent the end of the cooling device from an unraveling point of the yarn plug,
- an adjusting device for adjusting the position of the unraveling point of the yarn plug, the adjusting device being connected to the drive of the yarn withdrawal device and a sensor which senses the position of the unraveling point of the yarn plug, and
- a controller connected to the adjusting device for controlling at least one parameter of the crimping device which influences the formation of the yarn plug.
Dependencies are inferred from the claim text.