08.19.10
Three Roll Mill Troubleshooting Tips
At Torrey Hills Technologies, we have excelled in customer service throughout the years by successfully providing our customers with solutions to difficulties they encountered while operating our machinery. We attempt to address any concerns or issues on a case by case basis. However, for the sake of efficiency we took the time this week to make a list of the most common problem and pertinent solutions condensed into the most simplistic form. The following troubleshooting tips are general guidelines for approaching frequently occurring issues:
1. Cooling
The rollers are cored to take cooling water. When planning to use the machine consecutively 30 min or less, there is no need to connect it. If cooling water is needed, use automotive antifreeze coolant and use a small immersion pump to pump water into the rollers. If the water is leaking into the three roll mill, it indicates the leak of the current is too strong.
2. Material is leaking from the side
Normally, there are two causes for leaking at the side:
I. The rollers are not parallel. The more narrow side will have
paste leaking out. Please adjust accordingly.
II. The end plates do not fit on the rollers tightly. The rollers are
machined to +/- 0.002- 0.005mm tolerance concentricity. The
end plate arcs are grounded similarly. However, these do not
have an exact match. When the roller gap changes, the gap
between the roller and end plates will change at the same time.
When you set up, please use one hand to press the end plate
against the roller and then gently tighten the screw to fix the end
plate position. Do not over tighten the end plate screw. After a
few months’ use, the end plates will match the roller very well.
3. Transmission making noise
If the gears make noise during operation, the gears could be misaligned. Since the distance between rollers are adjustable this allows the gears to also move. If the rollers are not rotating parallel to each other, it will cause the gear to misalign and make noise. It should be corrected immediately to prevent any damages to the gears.
4. Resistance when adjusting bearing blocks or freeze bearing block
When the machine is used for an extended period of time, some of the material could leak into the sides of the rollers and spread into the bearing blocks. It will cause resistance when adjusting the rollers and in some cases the rollers can freeze if the problem is not taken care of. Proper cleaning and lubrication will be needed and should be performed according to manufacturers’ suggestions.
5. Poor Grinding:
This can be caused by the following.
I. The vehicle and pigment are not properly and thoroughly
mixed.
II. If the paste is too thin.
III. If paste is leaking off both ends of rolls.
IV. If the rolls are set too far open
6. Motor Overload
This can be caused by the following:
I. Check if the voltage on power line is low by testing it at full
load.
II. Again, make sure the paste is mixed properly.
III. Not having enough lubrication which heats up bearings.
IV. When parts (Apron or guide blocks) are pressed too tightly
against the rolls.
