Yarn Dyeing : Kiss RF Dryers Good Bye!

Technology has taken a new turn now. High Pressure Drying takes over from RF or steam drying.
All it takes a blast of Hot high pressure to remove moisture from the package and one gets nice and dried packages . This is the same old Pressure  Dryer , which has now become viable as RF dryers and hydro prices have soared. Only that now customers are viewing Pressure Dryer as a more friendlier system of drying .

This would mean, end of Centrifugal Hydro extractors and End of RF Dryers. No more pulling out packages from the yarn dyeing machine and loading on centrifuge and extracting 50 or more percent of water and then drying with Radio Frequency.

The energy cost of drying with high pressure dryers may be much lower then the combined energy used in Hydro and RF. Though , I am still searching, how much energy actually goes into it .However, the deliverable' s with pressure drying are much much better viz

Very Low Investment compared to Hydro And RF Dryer.
Atleast 15 to 20 workers reduced. ( For 10 TPD Plant )
Lower Energy consumption
No handling of packages any more
No damage of package in Hydro
No shape distortion in Hydro
No yellowness in RF Dryer
Lower Throughput Time
Efficient system
Heat Recovery
Space Saving


These are already too many deliverable' s of this  technology.

Currently, the machine makers are charging a huge sum for this equipment. However, if you are a smart engineer , you can design this system by yourself at 25% of the offer cost from machine makers. As usual, the current machine design as offered by the dyeing machine maker has bugs.  The dryer does not need a SS vessel. Air circulation does not need SS tanks. No compressor of any size has its air tank made out of SS. The water and the heat from the dried packages can rust the wall of the dryer and hence the inner wall can at best have an SS sheet lining or use some composites which are water and heat resistant.

Since, it is a simple technology, sooner or later, most people will understand and this will mark the end of Hydro and RF dryers.

This also means the return to the Mantex Dyesprings as Dyeing Center. Since the biggest hassle with metal springs was always the burn out rate in hydro extractors. Now that issues is resolved forever.

Those who will still not use compressed metal spring  package centers will only keep their cost of dyeing 25 to 40% higher on account of poor education and poor technical skills. Somehow the Winding machine makers do not know, how to manage a  mantex dyespring to run at high speeds and are misleading the yarn dyers to avoid metal springs for dyeing.

One has to be a big fool to ignore that each dye lot made on precision winders with plastic dyetubes results into a capacity under utilization of 25 to 40%.  It is like an airline, which takes 40% empty seats, because some supplier goes and tells him that quality of flight will be much nicer ,if he keeps the load lower.

 In fact, if only precision winding makers had sense, they would have found that with precision winding on dyesprings, the payload into dyeing machine improves both horizontally and vertically. Horizontally as now within the same diameter, they would pack more yarn and vertically, because packages will be compressed 25 to 40% . Overall payload will go up by 40% in case of cotton yarns and 60% in case of Texturized Yarns.  This would automatically justify higher investment against drum winders, which are generic competitor to Precision winders. But like I have written before, much of the machine makers themselves do not know about Textiles and the Industry ofcoarse refuses to use common sense . If Dyesprings dyed well for 50 years and that too with random winders, then surely it will have a far higher quality advantage with precision winders and will still give the higher thruput value to the dyer.

Companies Like Arvind Mills, Ashima , Mafatlal, Garuda Cotex , Abhishek, Welspun, Winsome, Anlima Yarns, ( B.Desh)  and hundred others for decades used Dyesprings on Precision Winders. And these are Global scale companies with very high quality and very strong work culture. But there are still some dyers, who get trapped into the plastic dyetubes for precision winders.

In any manufacturing set up, the throughput decides the final cost of manufacturing and any technology, which inhibits the thruput can never make profit sense . Do you own maths and see, that any plastic dyetube user loses more then USD1 million per year on account of under utilizing the capacity of dyeing machine. Only because some joker , somewhere in the world went and taught the dyer that plastic dyetubes give better results and the dyer as a flock of sheep followed him , without actually doing his own maths and quality evaluation.

We are not set of technologist or engineers, who have been taught to question and probe and research and then take intelligent decisions. We only take infantile pleasure in doing something, which others are also doing and believe that we are smart . Not realizing that it is this inefficiency which has bought today the Industry in Europe and US to a stage of non competitiveness against Asia and not the labor cost alone. And it is this inefficiency which is the biggest weakness of the big companies, that is being exploited by the small dyers, who manage to keep their cost lower and making the big companies run for their money.  I met a small dyer in Panipat this April and he said, it was because of the metal dyesprings, he could dye in a 200 kgs machine a lot of 300 kgs random wound packages, where as others were dyeing around 200 kgs with precision wound plastic dyetubes. The money flow had made him so rich that from a 2 ton dyer, he was now going into a 10 ton yarn dyeing plant.

Anyway, time to Kiss RF Dryers and Plastic Bobbins Good Bye Forever.