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Cold vulcanizing is a type of conveyor belt repair and joint method rich in curing and connecting strength to bond the conveyor belt through cold vulcanization adhesive, which could achieve rapid curing without heating and pressure, so the conveyor belt forms an entire. This process is appropriate for medium-sized conveyor equipment, and it has the options of wide application, convenient operation and joint strength.
Principle for cold vulcanizing
1.The adhesive is 2-component, made up of glue and also the curing agent, and also the two are utilized inside a mixed ratio that is known as weight ratio(wt)=9:1~10:1?
2.The glue is really a solvent-based polymer material adhesive. Under normal temperature conditions, the polymer material colored around the sticking surface will form a crystalline film using the rapid evaporation from the organic solvent, that will rapidly generate adhesive pressure.
3.The curing agent, also referred to as the mix-linking agent, can rapidly mix-link to the polymer material within the glue under normal temperature conditions, which could rapidly enhance the initial and final tack strength and boost the connecting performance.
4.The glue and hardener are responsive to water and moisture. Water vapor in mid-air can build a water film on the top of film, and also the water residing in the show will form an inadequate boundary layer, losing its activity, and lowering the connecting strength. The curing agent chemically responds to water, loses its activity, and can’t achieve mix-linking. Therefore, attention ought to be compensated to waterproof and moisture-proof, and it shouldn’t connect with water throughout the storage and operation from the adhesive. The connecting interface should be fully dry which is not appropriate for connecting joints within an atmosphere having a humidity more than 80%.
5.The glue and hardener are responsive to dust, grease, oil along with other contaminants and chemicals. The connecting interface should be cleaned (don’t use water). The soap should be fully volatilized to help keep the interface fully dry.
6.The multi-layer belt joints are glued by lap jointing, and also the lap joint surface is converted into a 3-5 level inclined step pattern. The connecting interface is really a fabric layer, that is coated with glue on sides. Attach them carefully and use a certain pressure after the top of adhesive film is dry.
Factors towards the adhesive curing
The connecting pressure from the adhesive progressively increases using the extension of your time throughout the curing process. The connecting procedure for the joint is really the curing procedure for the adhesive. Generally, the first curing is achieved in 30-an hour, and also the final greatest strength of curing is achieved in 24 hrs. The more the standing time, the greater the curing strength.
1.Solvent evaporation rate: Generally, the faster the evaporation, the higher the initial stick and also the greater the first connecting strength.
2.Temperature:Generally, the greater the temperature, the faster the curing, and also the greater amount of curing, the higher the connecting strength.
3.Humidity: Generally, the greater humidity, the slower the curing, the more serious amount of curing, and also the lower the connecting strength.
Additional factors towards the connecting strength
The dry and clean amount of the connecting interface: the cleanser and dry, the greater fully the adhesive can infiltrate the material, and also the more powerful the adhesion.
2.Pressure put on the lap joint: the higher the applied pressure, the greater uniform and also the more powerful the adhesion.
3.The quality of fit between your overlapping surfaces: the tighter body, the more powerful the adhesion.
Find Out More: High duty cold vulcanizing adhesive supplier
Cold connecting steps for that conveyor belt in a 70 degrees
1.Joint making:
1)Along the size of the belt, make use of a cutting knife, a layer screwdriver, peeling walnut pliers, etc to chop and peel the belt layer by layer to create an oblique walked lap surface (Figure 1 1/2/3) . Don’t injure fabrics for example canvas when cutting each layer, and cut the advantage from the belt evenly using the braid layer.
The lap length L:
generally take .6~.8 from the width B from the conveyor belt. The overall principle would be that the longer the conveyor belt, the more the lap length.
Beveled section:
Thinking about the benefit of cutting and pasting, the cutting position is usually about 30°. In actual operation, generally go ahead and take beveled section (small right-position side) as about 50 % from the width B from the conveyor belt.
Cut the steps:
the reason would be to prolong the service existence from the conveyor belt joint. The greater steps, the more the service existence and the higher the workload.Comprehensive consideration, the amount of steps is usually not under 3, preferably greater than 5 (considered with the amount of skeleton layers).
Once the two ends from the tape overlap one another, top of the tape ought to be within the same direction because the running direction. Following the two lap joints are created, they must be overlapped together to determine the dimensional precision, and appearance if the braid layering is accurate and appropriate, or adjust it. Tthere shouldn’t be gap between your steps, and also the two walked overlapping surfaces ought to be aligned and fitted.
2.Surface treatment:
Make use of a portable electric wire wheel or wire brush to smooth and evenly roughen the top to become stuck, take away the residual rubber layer, and roughen the uncovered braid body, but don’t damage the canvas or any other braid body.Brush-off the dander, and employ cleaners (for example acetone, anhydrous ethanol, trichloroethylene) to wash and decontaminate, and allow it to dry completely.
Don’t wash with water. Belts utilized in damp environments should be dried under the sun or baked with iodine tungsten lamps and infrared lamps to completely dry them
3.Mix glues:
Pour the hardener within the aluminum bottle in to the iron bucket with glue and blend completely and stir evenly.
Based on actual needs, part of adhesive and hardener could be included other containers based on the weight ratio.
The prepared solvent can be used immediately, and it ought to be consumed within 2 hrs from the pot existence, that’s, it ought to be controlled within 2 hrs from mixing to make use of. Not for lengthy.
4.Apply adhesive:
Make use of a short and difficult brush to use the glue evenly one way in three occasions around the fully dry surface to become stuck, and also the glue layer shouldn’t be too thick or too thin.
After each brushing, the adhesive film reaches the top dry (that’s, following the solvent evaporates, until it doesn’t follow the back from the finger and it has a sticky feeling), then brush the adhesive again.
5.Dry:
To save time, result in the glue achieve the ultimate curing strength ahead of time and enhance the connecting strength, use iodine tungsten lamp or infrared lamp to bake after each glue application (baking temperature 60 ~ 80 ?), accelerate the evaporation from the solvent, until no adhesion Brush the glue again when the rear of your finger is.
The fast-drying adhesive is flammable, and also the vertical distance between your lamp and also the overlapping surface shall ‘t be under 50cm during baking, otherwise the adhesive film will easily burn and catch fire.
Baking and drying is particularly necessary when connecting the belt inside a cold and damp atmosphere.
6.Connecting:
Following the third gluing and baking until it doesn’t keep to the back from the fingers, align the 2 walked overlapping surfaces, and overlap the 2 ends from the tape based on the running direction from the belt.
Tapping with hands in the middle towards the area is sufficient for two to three occasions to exhaust the environment backward and forward overlapping surfaces. If blistering occurs accidentally, it may be pierced having a needle after which beaten or crushed.
7.Curing:
Following the belt joint is glued, it ought to be cured at 70 degrees for 30-an hour before tension, and so the site could be cleaned and also the production could be run under load.
If conditions permit, prolonging the curing time can make the connecting effect better.
For connecting belts in cold or damp environments, additionally to baking, the curing time should be extended to some sufficiently lengthy time, generally 24 hrs.
For those who have any queries during use or installation, please contact BAI-OTT Coveyor Belt Accessories Company.
