DEVELOPMENT OF AUTOMATIC EQUIPMENT FOR ESTIMATION OF DEGREE OF POLYMERISATION OF CELLULOSE BASED PAPERS.

摘要

The present invention relates to an automated machine integrated with a PC and control circuits and method thereof for estimation of degree of polymerization (DP) of cellulose based paper insulation of transformer comprising collecting cut paper samples from the leading ends of a transformer and conveying the said collected papers through the automated equipments of the machine comprising five set of rollers (1 to 5) for squeezing of oil from the test insulation paper, cleaning the paper with a solvent, drying the sample paper with heating means (H) controlled with a electronic circuit, and to drag out the paper out of the machine respectively. In between fourth and fifth set of rollers are provided a shredding means (5M) with punches to cut the paper into small circular pieces and a paper chip chute conveyor (c) for transporting the small pieces of paper to a digital moisture balance (W) to weigh the initial and dried out weight and moisture content of the paper samples. The preweighed and dried paper sample pieces are dissolved in a glass flask (F1 & F2) containing predetermined amount of DM water and CED by shaking in a shaker assembly. Theefflux time for blank and sample solution is recorded via sensor in a builtin digital analog computer by noting 1st and 2nd signal for corresponding 1st and 2nd mark for the said blank and sample solution, to give a measure of viscosity of the solution, DP of the sample paper through a software using Martin's curves, all the operations of the rollers, shredding means and chute conveyor are controlled through an integrated PC with controller circuit via a RS 232 port.