What is Tribotester? Bleaching for Processing of Cellulosics
Tribotester
| Tribotester Description | Detail |
| Rotational speed | 0-500rpm (or more) |
| Plate disc sample holder | 115mm diameter |
| Sample size | up to 80mm diameter thickness from I to 15mm |
| Maximum normal force | at least 60N, by means of dead weights Standard set of dead weights: I x1N, 2x 2N, lx 5N, 1 xION, 2x2ON Measurement of frictional force by means of in-built strain gage force transducer |
| Frictional force resolution | <10mN |
| Transparent protective | cover in high resistance polycarbonate with 2 windows for manipulating |
| Software |
Direct real
-time display of the different testing parameters: friction force, friction coefficient, rotating speed, tangential speed, travelled course, number of cycles, calculated channel(defined by user) values, and signals from external devices (if included):tempetatures, electric contact resistance Selection of the control commands. Rotating speed, number of cycles, etc. ‘resting and acquisition parameters control. Programming of Testing Methods (sequences, parameters) defined by the user, with parameter inputs and including the possibility of generating cyclic tests. Capable of continuous and alternative modes (cyclic linear and rotary), Graphical representation of the testing data Data exportation to Excel Configuration software module to re-configure equipment for additional options or sensors (user accessible). Programmable alarms and limits. |
The factory management must hire an outside consultant for implementation of WRAP standard and make its compliance. The factory management has to adopt all the principles and have them in place, with documentation, for a minimum period of 45 days before it can request a WRAP Evaluation. When the facility’s management is confident that it is in compliance and satisfies the documentation requirements outlined in the self-assessment handbook, it may contact an independent WRAP-accredited monitor to schedule an inspection. Read more about What is Melt Index Tester? How does it Works?
The factory will pay the Independent Monitor’s fees and will determine the fee and scheduling directly with the selected Monitor. The Monitor will conduct the evaluation at the mutually contracted time and report the preliminary findings to the factory management and WRAP. If the facility satisfies the compliance requirements, which includes a favorable recommendation by the Independent Monitor, it will then submit a written Certification Recommendation
Bleaching for Processing of Cellulosics
Cellulosics and their blends with synthetics could be desized, scoured and bleached in a single stage. This could reduce the processing time by a considerable extent, apart from reducing the water consumption and wastewater generation.
This measure has been implemented in number of units in India, particularly for the batches where the final dyed product is of a dark shade. In these situations no adverse effect on the quality was observed. The improved environmental impact is due to the fact that all three processes could be carried out in just one bath (instead of three different baths for thrice the duration and having rinses in between). Furthermore, as in earlier mentioned options, the industry concerned would need to make a few trials before commercial implementation.
Reduced process time and energy
Reduced water consumption
Reduced wastewater generation
Reduced cost of effluent treatment
Applicable for cellulosics and their blends only. Combined process for desizing, scouring and bleaching is particularly suitable for fabrics in dark shades, where the bleaching requirement is low. However, this could also be applied for medium shades, depending on the efficiency of the combined process.
The savings are obvious because of the reduction in the number of stages as well as the process time and water.