Metal finishing Q&As since 1989


-----

Surface finish in galvanising and edge build up problem

Dear sir,
I am interested to know how we can get better surface when processing strip more than 150 mpm. also how can we solve edge build up problem while narrow width strip with higher coating i.e., 180 or 275 gm/sq.m

Prasad Ghate
coating shop - Mumbai, Maharastra, India
2005

What method are you using to remove excess zinc from surface? What type of chemistry do you have in your zinc bath?

David Jaye
Houston, Texas
2005

If this problem with edge buildup is generally on narrow width coils try taking the knives out and bringing the air pressure up . This seems to help in most cases . Also have a look at your gapping settings in your knives , there may be room for adjustment on your parameters . If none of these work try adjusting you baffles to run a bit off center by adjusting passline . Hope this helps your problem .

Mark Postema
- Rancho Cucamonga, California, USA
2005