Page 44 - November-December-2020

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means of an integrated light barrier, resulting in actual tension being applied. (IDF 1 break draft 1.0).
perfect synchronisation between card and IDF. The The second diagram illustrates that IDF 2 and IDF 1
levelled loop permits high change speeds. This both have the same trend, i.e. that the yarn strength
ensures a higher efficiency at the card, especially decreases with increasing total draft. Compared to
when using small rotor cans. IDF 1, IDF 2 shows overall strength at a higher level.
This confirms the statement that the use of only one
drafting zone has a positive effect on the yarn
properties.
Development of the IDF 2
The IDF 2 has been established on the market for
seven years. The advantages of the system are now
recognised by the entire professional community,
competitors and customers. Initially, the shortened
process was only used with 100 percent cotton –
preferably from the recycling sector – but today it is
Development IDF 2: The new retention lock facilitates operation in case of
minor production interruptions
The combination of Truetzschler cards with IDF 2
gives customers an advantage, because they
produce a thin, stable web which is perfectly suited
to be drawn directly to the desired sliver count – at
highest production rates and lowest drafts. If cards
produce a heavier web, the use of low drafts is not
possible at all, as, for example, from 12 ktex to 5 ktex
a draft of 2.4 is applied.
One versus two drafting zones – technological no longer limited to this. The system is successfully
advantages applied in the processing of 100 percent raw cotton
In order to show the influence of the distribution of and other materials. It thus offers an answer to the
drafts on main draft and break draft as opposed to requirements of our customers with regard to
only one draft zone, a yarn of 100 percent raw cotton increasing and necessary flexibility in the production
(Mato Grosso) with Ne27 was spun in the direct process.
spinning process with a card production of 170kg/h.
With IDF 1, break drafts of 1.0, 1.05 and 1.16 with The handling of the IDF has also been improved. For
different main drafts were combined. The IDF 2 was example, there is now a retention lock that prevents
run with drafts of 1.2 to 1.95. The tests showed the the cover of the IDF from always having to be
trend across all parameters that IDF 2 with its 1-zone opened completely during the piecing process.
drafting system has clear advantages over IDF 1. Similarly, the use of maintenance-free deep groove
ball bearings entirely eliminates the need for
The first diagram shows the influence on yarn relubrication at the delivery rollers: The number of
evenness for a total draft of 1.7. There is clear lubrication points is thus reduced to four. The
evidence that the break draft in the IDF has a
negative influence on yarn parameters. It is self-adjusting lap monitoring of the top rollers,
noteworthy that for all quality parameters, the already known from the draw frames, has now also
presence of the first drafting zone in the IDF 1 alone found its way to the IDF. There is no need to readjust
has a negative effect on the results, without any after grinding intervals and changed settings.
November/December 2020