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HOME > Product Information > LCM - Salt bath plants for the curing of rubber profiles

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LCM - Salt bath plants for the curing of rubber profiles

LCM - Salt bath plants for the curing of rubber profiles

<Newly developed, environment-friendly salt bath curing technique from Durferrit GmbH>

In this technology, in addition to the environment-friendly  salts  developed for ther­mo chemical/heat treatment processes, a new salt bath plant is adopted which operates with­out effluents occurring. This means that the  treated  parts  are rinsed thoroughly, using a minimum of fresh water, in a cascade washing system, and that the relatively small amount of rinsing  water can be processed very  economically. The recycled salts can be used again. Should a recycling not be possible, the salts concerned must be disposed of in accordance with the local regulations. Durferrit GmbH  will,  of  course,  be glad  to help customers find suitable solutions to their problems. In  order  to  meet  today's  ecological  requirements,  we have developed a new salt  bath technology  for  curing.

In  a  separate  electrically-heated or gas-fired salt bath furnace, the  salt  melt  is warmed up to  curing  tempera­ture, which  is between 200° C and 280° C. By means of an electromotive salt bath pump especially developed for this purpose, the salt is pumped into  the curing bath through a pipeline or also by a sprinkler unit.

At the end of the curing salt bath pot, the molten salt runs back into the supply salt bath via an outlet. In this central supply salt bath there is a desludging  area with  a strain­er screen through which the salt flows back into the pot. At the same time, floating  particles, sludge and

carbon­ates are separated from the curing salt  bath, and can be removed easily.

The  curing  salt  carried  out  with  the  rubber  profiles  is concentrated  in the rinsing cascade, solid particles are filtered out, and the reaction foam is (for example stearites) automatically removed.

By means of an  automatically controlled   pump,   the   concen­trated salt solution is pumped out of the waste water collecting tank and sprayed onto the surface of the separate supply and regene­ration salt bath. The   rinsing   water   evaporates, and the  reclaimed salt  is again  in the supply cycle.

 

<Advan­tages  of  the  system  compared with   conventional   curing   salt baths>

1. The  continuous   filtering   and cleaning   of   the   curing   salt bath   ensures    high   quality results.

2. Almost   all  the   salt   dragged out  of  the   bath  is  regained and reused.

3. Feeding  the  curing  plant  with  molten  salt  ensures  a uniform temperature.  Fluctuations in temperature  due to filling of the curing salt bath with solid fresh salt do not occur.

4. Due to the continuous  inlet and outlet of  molten salt, the level of the curing salt  bath remains constant,  so that the pressure on the  rubber profiles is always the same.

5. The   supply   and   regeneration   salt   bath   can   be gas-fired, and  is therefore  particularly  economical  to operate.

6. Continuous  desludging  ensures  there  is  no  fire-risk due to rubber particles floating  in the curing plant.