Yarn Suction from Bobbin in Axisymmetric Acceleration Flow

Part 2 : Some Considerations on Entrance Shape of the Device to Obtain Better Retrieving Effect

Abstract

In textile processes, it should be very important problem to develop an effective and economical retrieving method of yarn by using air suction.
In this paper, the effective boundary condition of an air flow on such action, especially an entrance guide shape of an air inlet is investigated to determine the optimum condition of such operation.
In order to obtain the influence of flow pattern using the conical air guide on the retrieving effect, the several different types of guide with various conical angle are tested.
The experimental results on the pressure distribution along the bobbin axis suggest the flow pattern in the axisymmetrical canal between the bobbin and its adapted hood and those effect on the retrieving are analyzed on the basis of the concept obtained in the previous paper.
An analysis has shown that the entrance with 0°or 90° conical angle; the hood provided with skirt parallel to the bobbin axis or circular plate perpendicular to the bobbin axis is effective. The selection of a hood shape depends upon the space of the installation place.