Yarn Quality Improved by ACP Quality Package

1. Preliminary Remarks

Today, the well-known 3-roller double-apron drafting systems of ring spinning frames permit to draft rovings up to a total draft of 80 and more under optimum conditions. The task of the break-draft zone is to introduce the sliding process of the fibres of the twisted roving. In the subsequent main draft zone, the fibre strand is guided between the top and the bottom aprons and drafted to the desired final count of the yarn.

This mode of operation is already very old and has hardly been modified in the last decades.

With the ACP Quality Package by SUESSEN it is now possible, however, to improve the drafting process in the main draft zone and consequently the values of the most important yarn parameters.

2. The Drafting Process on the Ring Spinning Machine

2.1 The Break-Draft The purpose of the break-draft zone is to prepare the main draft. The fibres in the roving are stretched and extended up to a degree which allows them to shift in the main zone immediately after leaving the cradle clamping line.

The basic correlation for each individual staple length between the setting of the break-draft zone and of the break-draft of a ring frame drafting system is shown in Fig. 2.

A long break-draft zone with the smallest possible break-draft must definitely be preferred. It reduces very clearly the wear of top roller cots and aprons and the load on the draft gearing, especially in the case of long machines.

In addition, the total system is less prone to climatic modifications, variations in fibre length and fluctuation in the drafting resistance of the roving.


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