Re: Belt Slitting
Dear Shri S Das,
If there is no problem with your present belt of full width due to the said joint, then, there should not be problem when it is made of two equal half widths.
It is presumed that you are referring to vulcanized joint.
It is also presumed that the slitting will provide neat and straight cut without unevenness otherwise, it will result into reduction in strength.
Regards,
Ishwar G Mulani.
Author of Book : Engineering Science and Application Design for Belt Conveyors.
Advisor / Consultant for Bulk Material Handling System & Issues.
Email : parimul@pn2.vsnl.net.in
Tel.: 0091 (0)20 25882916 ■
Re: Belt Slitting
Beware that when slitting a belt that the side with the slit can be stretched in the slitting process, giving the belt an uneven stress distribution, making it hard to track.
When one is slitting a 1200mm wide belt down to a 900 (say), it is better to slit 150 off both sides rather than 300 off one side. ■
Re: Belt Slitting
We slit conveyor belt on regular basis,
You will have no problem with slitting down a splice.
You didnt say if the belt was second hand or new.
If it is new belt I would contact the manufacturer prior to slitting.
I have slit new Apex Fenner belt down the middle without any problems.
Many narrow width belts are produced in slab form and slit down to required width.
I have to disagree with Matt, in that you do not stretch belt during the slitting down process. With a correct set up I dont understand how this is possible.
However if you are considering slitting second hand belting down the middle you will be presented with tracking problems when it is placed on a system. I believe this is because of the wear and tension differences between the edges and centre of the belt which are shifted when the belt is slit down ■
Re: Belt Slitting
Beware of the manufacturer's QA:
Some mfgs. do not symmetrically tension the fabric in the prepress stretching. A higher edge and lower center tension may result, that when split, will exhibit poor tracking or have a banana path.
LKN ■
Re: Belt Slitting
Thank you all for your answers.
What I could figure out from your replies is that, if the correct process of slitting is adopted, then it will not have any problem although the belt has got a splice (vulcanised) across the width. Am I correct?
I thought, during slitting, you have to give some tension in the line to keep the belt straight and this tension will act differently on the points of splice across the width (since the splice is at a bias angle and the internal geometry at the splice region will be different from the rest of the belt). This differential tension in the splice region may lead to tensioning problems in the slitting process culminating in mistracking during use. This was my view.
Since I understand that it is possible to take care of the above, Can you also give me a few control points for the correct process of slitting that many of you have mentioned in your posts. Like whether the belt should be under tension, or relaxation , what speed etc..etc...... The subject belt is of 140cm width to be cut into 70+70cms; 250 mtrs length.
If any one has got practical experience of slitting a belt with a splice inside, do let me know about your process conditions and your customer's feedback on the same.
Hope to get some more indepth knowledge on this,
Best Regards
SD ■
Belt Slitting
Mr. Das,
There would be no problem of slitting belt & we have used in many projects. However, you have to be very care full about edge prepation.Please note that we have use slitted belt of very low rating only.
Regards.
A. Banerjee ■
Re: Belt Slitting
Dear Mr Banerjee
Can you please explain what you mean by edge preparation.
Regards
SD ■
Edge Preparation
Dear Mr. Das,
During cutting Nylon (if it is ?) fabric may come out & you have to cut & press the new edge in totally. The same could not be done at site.
If the slitting is neat &straight cut without any uneveness & tension is very low, then edge preparation is not essintial.Other-wise please refer the matter to belt manufacture.
I understand that the belt is not having moulded edge construction & for such case you have to call belt manufacturer as it needs rubber compound & machine to do so.
Regards.
A.Banerjee ■
Belt slitting
I have a 3 ply nylon belt (300/3) which needs to be slitted into 2 equal widths. One of the 3 plies in the belt has got a splice (joint) across the width. Will there be any problem faced due to this joint during slitting or in the subsequent application in the field?
regards
SD ■