Dying Leather (Bull skin)

[ChayaRo]

Hi, 

I work for a company  outside of the US that manufactures products that are made from leather. 

Up until now we used to by the processed leather after it was dyed and now we are looking into doing the process in house .

We have tried a few ways of dying the skin black  and met with companies in Europe but didnt reach the result we  were looking for. 

We were told that there is alot of companies in the US the specializes in these kind of things and have a lot of knowledge. 

Since we are a big company we are looking to work and purchase on a large scale once we find the right company to work with. 

If anyone has any insight on this topic or know any good companies in the state that specializes in this that we can meet with,

I would really appreciate it if they could send me in the right direction. 

Thanks!

 

[Rahere]

You're really looking at the dyeing stage of a tannery, which normally means a pressure drum (or more) and dryers. Additionally, you'll need to consider waste water treatment.

What type of leather are you using, for starters? Do you have technical needs for dyes? Because it's organic chemistry, if you can't find what you're looking for (this is project design, normally, rather than off-the-shelf), a general food manufacturing plant design team could probably handle it. The one I worked for at the start of my career (Schweppes International Production Services) is sadly long gone.

Essentially, a drum with axial hot liquid feed framed by roller bearing rims at each end is connected to an analine dye tank, delivering the dyestuff at up to boiling point. You might also need a mordant tank as well, to fix the colour - it depends on your dye supplier, which is a starting point. I prefer rim rather than hub bearings because the drum can get seriously heavy, and spreading the load at four points makes a lot of sense.

 

Edited May 7, 2021 by Rahere