The role of secondary heater is very often a disputed matter. The temperature is kept by the PTY manufacturers depending upon their end use. The experimental works were carried out with latest POY with latest texturising machine reveals the fact that there is marginal difference found the denier, tenacity and elongation. The main area is HCC % which is known to all. There is as such no difference in fabric width was found nor any dye uptake although the same is very often doubted by the end users. The bulk variation starts only at the difference of 20 degree centigrade between the primary and secondary heater. There is no remarkable difference in dye uptake was also found. The X-Ray and intrinsic Viscosity (IV) also do not show any difference as there is no change in molecular structure.


In Industrial practice the difference between Primary and secondary heater is maintained about 20 C depending on end use. Higher the difference, higher is the bulk observed. The temperature is being kept in most cases with assumption basis and with practical experience. As such no supporting data is available in this area. For the different end use different temperature (2nd) is being maintained. Hence vigorous studies are being conducted between the C of secondary heater vs. all yarn properties.

The role of primary heater is to mobilize the molecules and gives the desired yarn properties with the help of Draw ratio and D: Y. But the secondary heater makes the texturised yarn stable and taken for further process. It is also studied whether any structural changes take place with the variation of secondary heater.

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The author is grateful to Dr. S. V. Agarkar , Principal of Anuradha Engineering College for the continuous support , grateful to Dr. Tapas Bhattacharya (Ex RIL) , Dr. Swadesh Sett (Director) and Dr. S. K. Basu (Director MANTRA) for their technical support and guidance. The author is also highly grateful to Dr. A. B. Talele of Himsom Engineering, Surat to allow in conducting the Project works.

About the Author

The author is retired General Manager from RIL and is presently working as Lecturer in the Department of Textile Engineering Department, Anuradha Engineering College, Chikhli, Maharashtra as a T&P Officer and MR- ISO

This experiment is an ideal guideline for the PTY manufacturers