Hello Sir,

Please check the following points(assuming Textile Blet)

1. check the pressure applied on machine

2. Heating, Cooling and curing time.

3. Check te quality of filling materials ( like: Expiry dateand make)

4. Ensure no dust during joining process

If still problem persists just once try with Cold Joint, may be it mite work out.

Ramesh Kumar ■

Dear Mr.Sumaidh,

Cold vulcansising joints are not adviceable for HR belts. Cracks are happening only at the joints or through out length? Can you post the photos of damaged joints?

Have you consulted with the vulcanizing materials suppliers?

Rgds, ■

Heat, Fire, and Flame controlling environments to reduce the ability of the rubber and its composites to carry the necessary or demanding stresses.

We have tested heat aspects on medium-high heat belts (<160 deg C). We found EDPM to best others in this heat range. However, it also had its limits.

I write this to infirm that some simple testing can be done to prove the limits. H-Blocks are coupons configured to mimic a splice when one center cord rubber surround is loaded in shear (tensile testing) against its adjacent members. We heat- radiated the coupon surface to soak the rubber, in a hydraulically actuated tensile test machine, and cycled the coupon to measure the rubber stress limits matched to the operating specifications. Many tests were made to create a stress-fatigue curve of various competing rubbers. Stress, strain and strain-energy levels were then determined from rubber property, strain, strain-rate and temperature measurements. This test procedure proved very valuable in qualifying one bidder out of five competing firms. Fortunately for me, the client was willing to apply such a test procedure.

My point to this pedantic discussion is: Manufacturers should all be put to doing the same for their Heat, Fire, and Flame products. Then your answer would lay with many and you would be able to select the few that pass your specifications. ■

Dear Mr. Sumaidh,

If the temperature of the clinker is between 180°C and 350°C you have to solve following problems:

1) Normal high temperature cover like EPDM don't accept a continuous temperature of more than 200°C (the peak of up to 400°C is only for a very short time --> some seconds, maybe some minutes)

2) The splicing material for heat resistant belts is sometime less heat resistant as raw material of the belt itself (mostly 20-40°C less)

3) The carcasse of a normal belt made of polyester and polyamid (=EP) don't accept a continuous temperature of more than 200°C (the glass point of the fibers is only 165-185°C, the melting point is mabybe 255-265°C...)

4) You need a splicing equipement dedicated for this special application (high pressure Vulcanizing Press or a Metal Fastener or a Super-Screw Fastener)

My suggestions:

- Take a SolarShield Belt from the company Goodyear (Carcasse with glass fibre; temperature resistance > 400°C) with a EPDM cover and a stainless steel fastener instead of a hot splice (not possible to do it with SolarShield)

- Take a spliceless endless belt with a special carcasse (glass fibre?) and a special rubber compound (FKM rubber?) which can work with higher temperatures (very expensive but very effective method!)

By the way, if you want to make a hot splice I recommend to use a Waterbag-Vulcanizing Press. It's the best solution to be sure the the surface pressure will be uniform, even if the traverses are bending and if you have big tolerance of thicknes in the splice area. Further I recommend to use a modern Vulcanizing Press which is capable to check and to print all process data (surface pressure; temperature). ■

Dear Experts,

We are having a steep angle conveyor below Dolime Kilns discharge. The temperature of dolime in the conveyor varies from 120 to 125 celcius. ( Question 1 : Is it normal ?)

We could not find any damages on the top cover of the belt, which is of heat resistant grade to withstand upto 120 deg celcius. But cracks could be seen at clean side of the conveyor at random places. These cracks are more prominant at the joints and joints fail frequently.

Please find the photos in attached file. The broader shiny contionus ranges represent cracks in the ply. Cracks seen at the clean side are clear in the photos.

Request your advice.

Thanks & regards,

Attachments

hrc flex 4 (PDF)

■

Dear Sumaidh Choudhary,

We take your reference from Bulk Portal. Pls. mail me your landline & cell nos

and e-mail ID for advicing you the proper solution for your query.

Regards,

AMIT SHETH

EXECUTIVE PARTNER

UTILITY ENGINEERS

TEL:022-22676936(DIR.) / 34

CELL:09869031395

Originally Posted by cnc

Dear sir,

We are contractors carrying out hot/cold vulcanizing of conveyor belts in cement industries in India.

We face the following problems and look forward to your valuble suggestions:

1. In the clinker belts where the temperature is between 180 - 350 degreees C we are carrying out the vulcanizing by hot process. The belt being used is MRF HRT2 belting which is developing cracks with in 4 months. The joints are giving a life of around 5-6months only.

kindly give us your suggestions on improvement

sumaidh choudhary

■

Originally Posted by cnc

Dear sir,

We are contractors carrying out hot/cold vulcanizing of conveyor belts in cement industries in India.

We face the following problems and look forward to your valuble suggestions:

1. In the clinker belts where the temperature is between 180 - 350 degreees C we are carrying out the vulcanizing by hot process. The belt being used is MRF HRT2 belting which is developing cracks with in 4 months. The joints are giving a life of around 5-6months only.

kindly give us your suggestions on improvement

sumaidh choudhary

Try Super screw TR temp resistant to 200 degC or email me for further details ■

Dear Sirs,

We supply this unique conveyor belt joiner as opposed to vulcanising and not only in Australia but around the world also.

If you are interested or need more info don’t hesitate to contact myself.

Kind regards David

http://www.youtube.com/watch?v=Zfe-PHtsc3E

Originally Posted by sganesh

Dear Experts,

We are having a steep angle conveyor below Dolime Kilns discharge. The temperature of dolime in the conveyor varies from 120 to 125 celcius. ( Question 1 : Is it normal ?)

We could not find any damages on the top cover of the belt, which is of heat resistant grade to withstand upto 120 deg celcius. But cracks could be seen at clean side of the conveyor at random places. These cracks are more prominant at the joints and joints fail frequently.

Please find the photos in attached file. The broader shiny contionus ranges represent cracks in the ply. Cracks seen at the clean side are clear in the photos.

Request your advice.

Thanks & regards,

■

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Originally Posted by cnc

Dear sir,

We are contractors carrying out hot/cold vulcanizing of conveyor belts in cement industries in India.

We face the following problems and look forward to your valuble suggestions:

1. In the clinker belts where the temperature is between 180 - 350 degreees C we are carrying out the vulcanizing by hot process. The belt being used is MRF HRT2 belting which is developing cracks with in 4 months. The joints are giving a life of around 5-6months only.

kindly give us your suggestions on improvement

sumaidh choudhary

■

Gentlemen,

You can purchase a high temp belt that is advertised to survive 750 F or 400 C operating conditions from Goodyear?Veyance. The trade name is called SOLAR SHIELD XL-750.

Hopefully, that should do what you are looking for. ■

Hi Sumaidh

In addition to the numerous wise words above and the details from Voijen, two comments..

- For lighter duties, you could consider the mechanical Vee splice

- Otherwise, make sure that your splice kits are within their shelf life

Cheers

LSL Tekpro ■

We have been supplying UHR belts with running temperature of 220 deg cel to companies like HONDA ad the life of the belt is almost 18 months, we have also received certificate of appreciation for the same. Any requirements of critical application please let know. ■