The Importance of Graphite Seals & PTFE in Hot Melt Equipment

Graphite seals and PTFE are used in all of Universal Systems SE’s pumps and modules to increase the longevity and life of those products. But why? In order to understand how we can boast about the quality of our products, it is first important to understand the quality and reasoning behind using certain key components.

Graphite seals are used in both the pumps and modules to create a smooth seal for the piston to move seamlessly through. Below are a few bullet points that explain why this particular component is so important.

  • Excellent heat resistance – up to 500°F – most all hot melt adhesive systems will heat up to 450°F, so even if a packaging line runs at the highest temperature allowed by the system, the graphite seals will remain unscathed.
  • It has a medium to high pressure rating – the maximum operating pressure on any pump should not exceed 35 – 45 psi. The most common operating pressure is 20 – 25 psi. These seals are rated perfectly for this type of application.
  • Excellent abrasion resistance – some packaging lines are not run with the cleanest adhesives, so utilizing graphite seals allows for any adverse environmental condition.
  • Very resistant to chemicals – this allows the end user the ability to not only use multiple types of adhesives, but cleaners as well.
  • Excellent extrusion resistance in severe conditions.

If you are interested in learning more about the components used to manufacture Universal Systems line of ProBilt™ equipment, please call (561) 272-5442 or email tech@ussefl.com.

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Piston Pump Troubleshooting

There are several things that can cause a piston pump to stop working. The most common reason is that it is clogged. Unfortunately, not all line operators take the time to close the lid on a glue tank. With a lot of carton dust in the air at any facility, this dust gets into the glue pot and melts in with the glue. When the pump shifter runs to pump the glue from the pot into the hose, that carton dust gathers around the pump which can cause it to seize. The simple solution to this is to make sure that all shift line operators are diligent about closing the tank covers, that’s why they are on there.

If carton dust is not your issue, and the pump fails, below are a few other possible causes and the corresponding solutions.

  • Adhesive not sufficiently heated – check the tank temperature and required melt temperature of your adhesive and set accordingly.
  • Inadequate or no input air to pump – increase the air pressure from the plant air supply and see if the pump will run.
  • Dry running – when a tank drops below a certain adhesive level in the pot, the pump does not have enough glue to operate at full capacity. The glue that runs through the pump acts as a padding so that the shifter does not pound against the top and bottom of the pump itself. When that padding is less, the pounding shifter can cause damage to the magnets and create an issue with the shifter. The only solution to this is to get a new shifter and potentially invest in an auto fill on-demand system that fills the glue into the tank for you, leaving less pressure on the line operators to fill the pot.
  • No Tank Screen or Clogged Tank Screen – the tank screen lives at the bottom of the tank and is the first line of defense against any foreign debris getting into the pump. Sometimes the tank screen gets removed or never cleaned. That can cause debris build up and seize your pump. It is easily cleaned by lifting out of the empty tank and then cleaning the tank with Purge Plus™.
  • Clogged Tank Filter – the tank filter screws into the side of the tank and filters the glue after it leaves the tank. If the tank filter is clogged, then the adhesive will back up in the pump, causing the pump to seize.
  • Pump solenoid is not on – if the tank is not within 35 degrees of the setpoint temperature on the control panel, the pump solenoid will not turn on. Check the setpoint temperature and make sure it is correct. If the setpoint temperature is correct and reading properly, then it might be a failed solenoid that needs to be replaced.

 

If you go through all of these troubleshooting steps and still have an issue with your pump, please call (561) 272-5442 or email sales@ussefl.com.

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