When a question was raised regarding 22-months delay in setting up of Apparel Park in Ahmedabad, Shri Vaghela squarely put the blame on State Government, saying that procedures and norms had already been set by the Central Government and the Centre has no role to play in the setting up of this park.
For all of us Open End Spinning is nothing new and many a countries are manufacturing Rotor yarns. But our needs are different when we wear fabrics which includes Cotton, Blend, Synthetics and many other fibres.
In India we have been considering open end yarn only as waste yarn but with change in technologies and attitude people found the yarn manufactured on Rotor are sometimes fitting in the slot of Ring yarn too. Presently many a companies in India are mahufacturing Yarns for Towels, Weaving bottom weights, Denims and now they have started fine counts too like 20s Ne and 24s ne . Here the market demands have changes and these has also been addressed by viscose yarn as well on Rotor spinning.
When I started my career in Rotor spinning it was more or less like denim yarn but now we progressed to fine yarns too . Here is one glitch we faced while going in for selection of the parameters to be implemented on Rotor machines for the type of raw material we are going to use and the type of product we are going to manufacture. For Denim fabrics many a faults can be hidden inside the fabric structure but this is not the case when we are weaving Grey farics, Towels , Knit fabrics. ( inclusion of knit fabric is nothing new as these are also making there presence on Open End yarn).
In the initial we have been using cotton like J34s/g and ideal cotton when considering its property for the spinning Rotor yarn. But the difference is that the Dust content of this qualty has gone up in the recent years. Previously the cotton used to carry a mere 0.01 micir dust level but now a days the finished sliver in India carries sometimes more than 0.05 microdust level. Here we are lost in Spinning open end yarn as the rotors gets loaded very frequently with the microdust.
We have made changes by implementing many a dust removal system in Blowroom and categoricaly Trumac and Trutzschler Blowrooms have succeded in reducing the microdust level in finisher sliver to a great extent.
Even after this we still process the cotton on the Rotor machines where almost all the OE machines are now adapt in handling the microdust levels but a few still excel. like in Rieter BT905 fully automatic machine we have the eleminated dust and waste content directly taken to waste chambers without disturbing other rotors leading to a clean machine and excellent process too.
Still we now go on for the selection of type of groove in the rotor. With the given enviornmental condition, the condition of cotton, the practices in Indian mill we look forward to different type of rotor groove at our hands.
We have T, U, and many others , whereas the T type and U type grooves are mostly preffered groove among others for cottons.
When T and when U is again a question here we get divided into many factors,
T gives good spinnability, low breakage, deep twist penetration but high snarling at the post process, also it is not adapt in handling dust.
U is not having excellent spinnability due to wider groove angle compared to T groove, breakage rate is higher, twist penetration is low, low snarling at the post process, but is adept in handling the dust.
Above are the derived things mostly from books and some practical approach. But we have found some practical things among them.
T rotors are not good for Rope Dyeing process due to high snarling tendencies , but you do not want to have the high breakage rate too. Henceforth in Indian condition we live with T rotors and give a lower twist to enjoy the application of U groove on Rope dyeing.
I will still be on in next blog.
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