Taking the proper steps is essential to achieve maximum productivity while preventing part marking.
Proper lubrication of ejector pins is critical to extending the life of an injection molding tool. Using the wrong lubricant or applying it incorrectly can lead to serious issues, including tool damage. Excess lubricant can bleed onto the tool surface, resulting in defective plastic parts. Additionally, thermal and viscosity breakdown may cause galling, seizing, and pitting. These problems can be avoided by following the correct lubrication procedures and selecting the appropriate lubricant.
New Assemblies and Preventive Maintenance Assemblies
Apply a high load-bearing, high-temperature grease to lubricate the back 80% of the ejector pin, such as SLIDE Super Grease (No. 43911P, 43900) or SLIDE UltraHeat Grease (No. 48300T). Then lubricate the remaining front 20% with a clear, non-marking lubricant, such as SLIDE Heavy-Duty 10% Mold Release. Spray additional clear, non-marking lubricant into the pin sleeve. Once properly lubricated, install the pin.
Additional Lubrication
Periodically reapply lubricant to the front section of the ejector pins. Set the ejector pin control to manual and move the pins to the out or eject position. Spray lubricant on the front of the pins, then return the machine to automatic mode and continue production. This maintenance should be done at least once a week, while high-speed molds may require lubrication before each shift.
For lubrication behind the mold, including the ejector plate, use a high load-bearing, high-temperature aerosol lubricant, such as SLIDE Super Grease Aerosol (No. 43911P).
What Does This Procedure Do For You
This method keeps grease from contacting the front section of the pins, preventing bleed-out during a run. Grease can break down and bleed-out due to destabilization of mold cleaners, rust preventives, or high temperatures, leading to contamination. Applying a dry film lubricant to the front of the pins greatly reduces the risk of bleed-out. If a mold cleaner or rust preventive compromises the pin lubrication, simply reapply following the steps in the Additional Lubrication section. Dry film lubricants are typically resistant to high temperatures due to their stable formulation.
More Information:
To help you choose the right product for your application, visit www.plastixs.com/products/slide-products.
For technical assistance, call the SLIDE experts at Plastixs at 508-842-1606, or email us at sales@plastixs.com.