There are two types of filters used in hot melt systems. The first, and most popular are the inline filters that go between the hose and the gun. These filters help reduce the transfer of char from the hose into the gun applicator. However, there is another type of filter that is just as important, and commonly overlooked. Your system’s tank filter.
Unlike an inline gun filter, that will come with either a straight, 45 degree or 90 degree filter body that houses a small inline mesh filter and mounts to your applicator gun, the tank filter is simply a long round cylinder that fits inside your tank itself. The tank filter’s job is to filter the glue out of the tank into the hose, reducing any burnt or charred old adhesive in the tank from clogging up your hoses.
Universal Systems SE recommends that you check and replace your tank filter every 500 hours. In order to check the filter, you can locate it in the lower right-hand side of your system tank. You may not need to replace the entire filter, so first check the screen. Below is an example of what the entire tank filter assembly will look like, compared to only the screen.
TANK FILTER ASSEMBLY TANK FILTER SCREEN
For more information on tank or inline filters, please contact firstname.lastname@example.org or call (800) 848-5018. Our Universal Systems SE technicians are here to help!
One of the most dangerous, yet inevitable, occurrences running hot melt systems in your packaging lines is char. Universal Systems SE has updated technology running in our ClearFlow™ hoses that reduces char, however the main char that runs through the hoses comes from the tank itself. Once your tank is infested with char, no matter how efficiently your hoses and guns run, there is always the potential to transfer this char onto your packages. You also run the risk of char clogging your nozzles and modules, which can back up through your guns and kill your pumps. Our Universal Systems SE technicians have seen it all. That is why we have created a list of preventative tips that each line operator should follow to effectively reduce char and keep your ProBilt® system running at top capacity.
Universal Systems Se recommends a complete hot melt system cleaning at least twice a year using our Purge Plus™ system cleaner.
Hot melt adhesive should always be stored in a strong container such as a heavy-duty plastic waste container. Do not set boxes or open bags of adhesive on the floor or on the top of the container. The container should be labeled “Adhesive Only” and include your adhesive part number.
Low Quality Adhesive
With hot melt adhesives, higher price usually means higher quality, the opposite is also true. Adhesive manufacturing is a highly un-regulated industry and many companies use low cost waxes and fillers in their products to reduce cost. These products tend to burn quickly. Due to the fillers and heavy waxes, low cost adhesives can greatly reduce your adhesive mileage whereas high quality adhesives are lighter and have a lower specific gravity. The bottom line is a higher dollar per pound does not necessarily translate to higher packaging costs. We also recommend that you do not mix old adhesives with new brand adhesives. Please read our past blog to help you understand why.
Hot melt systems are not cheap, so most of the ones in operation today have been on their packaging lines for 10 – 20 years, whether they are running properly or not. That means that most likely, these older machines have char built up in their tanks. It may be time to evaluate the performance and efficiency of your aging equipment and trade up to a new ProBilt®.
To get the latest pricing on ClearFlow™ hoses, Purge Plus™ system cleaner or ProBilt® adhesive melters, please email email@example.com. If you are experiencing issues with char, please feel free to call one of our technicians at (800) 848-5018 and we would be happy to help you.
First and foremost, your melter adhesive filter should be flushed once a day. Cleaning your melter filter can be dangerous so always remember to wear safety glasses and heavy duty gloves. This will help to prevent any injuries that might be caused by splashing hot melt adhesive during the flushing process.
The first thing you must do is heat your system to its operating temperature. This is very important to prevent damage to the filter screen. Next, you will need to reduce your pump air pressure to zero at the air regulator. Then, you must relieve the system pressure by triggering any and all guns. This will now relieve trapped hydraulic pressure. After all system pressure is released, you can open the manifold drain valve. Using a screwdriver, open the valve over an open container. You then want to slightly increase pump pressure until a steady flow of adhesive comes from the drain. Continue to allow material to flow until it appears clean and free from any foreign matter. Once the adhesive appears to be clear, shut off the air pressure to the pump and close the manifold drain valve. You now have successfully cleaned your melter filter.
The importance of a clean filter when operating your melter system is imperative to running a high-quality machine. Many people wonder if they should clean their filters or if they should buy new. The easiest way to tell if your filter should be replaced is if you have used it for longer than 200 hours. Every high-quality filter, even when cleaned daily, will only last up to 200 hours of operating time.
If you do need to replace your filter please follow the below steps.
- Heat the system to operating temperature.
- Reduce your pump air pressure to zero and trigger all guns to relieve trapped hydraulic pressure.
- Loosen the filter with a socket type wrench.
- Wearing Kevlar gloves, carefully pull the filter assembly out of the manifold.
- Remove the screw in the back of the filter assembly and discard the filter screen.
- Replace the filter screen and reinstall screw.
- Inspect o-rings for damage and replace if necessary.
- Slide the filter assembly back into the manifold and tighten until it seats.
Make sure that you purge the manifold by opening the drain valve and increasing the pump air pressure slightly until a steady flow of hot melt is released from the drain. Close the drain valve and your machine is ready to operate with your new filter.
To order replacement tank filters please reach out to Universal Systems SE at firstname.lastname@example.org or call us at (561) 272-5442.