It is Usually Always a Clog
The most common reason for your hot glue system acting up is because of a clog. Clogs are common because you are working with glue, which is sticky and chars over time. Below are some of the most common technical calls we receive, with the solution…and you guessed it, it’s usually always a clog.
Pump is not pumping
There are several reasons as to why your pump can stop up. Honestly, it is usually dirty oily air in your shifter. However, when it is not your shifter it is usually a clog. If your shifter is running fine, but it sucked something up into the hydraulics of the pump, the pump shifter will be stopped in the top position, unable to shift down. That is because you probably have some char or debris in your hot glue reservoir and while pumping, you sucked something up into the ball check valve. You have now clogged up your pump and need to send it in for a flush and clean. Another potential issue could arise if your pump is running but sluggish. If your pump is running mush slower than it used to, it is probably because you haven’t changed out your tank filter and it is clogged. The tank filter is located on the side of the tank and filters all glue before it runs into the hoses. If that filter is not regularly changed (every 500 – 1500 hours depending on how clean your glue is) then that clog can cause pressure to back up into the tank and not allow your pump to run at full capacity.
Gun is not firing
If your gun is not firing at all, it is probably your solenoid valve. However, if your gun is firing every other time or randomly, it is probably due to a clog in your in-line filters. The in-line filters filter the glue from your hoses into your gun. These filters are there to help filter our char or debris that was missed by the tank filter or that has built up in the heated hose. If the filter screens are not changed regularly, they will get clogged up and not allow for your gun to fire properly. For example, if you need to increase air pressure in order for your gun to fire, it is probably the in-line filter clogged up. Another clog can happen in the gun manifold itself. Typically, this is only in multi-module guns. If you have a multi-module gun and the last module in the line is not firing, there is probably a clog in the manifold.
Module Drips
If your module is constantly dripping glue, then you have a clog in your module. This is most common in air open, spring close modules. A piece of char will get stuck in the seat and not allow the piston to seal tightly, causing the glue to drip out. A clogged module will need to be replaced with a new module.
Nozzle keeps clogging
This one is fairly straight-forward. If your nozzles keep clogging there are a few solutions. First, you can change out your in-line gun filters. They are probably not clean and not filtering the glue through the gun. You can also increase your nozzle diameter. If you are running small hole nozzles such as .010 or .012 diameter, try a .014 or .016 and you will start to see less clogging. However, that will lay down a little more glue, so keep that in mind when reviewing your glue usage.
The best way overall to reduce the number of clogs in your hot melt systems is to do preventative maintenance. That means cleaning your tank every month or every quarter, depending on how many shifts your tanks are running. Universal Systems makes Purge Plus tank cleaner and we sell them in a 5-gallon pail so that you are set for at least 2 – 3 cleanings. Additionally, change out your tank filters and in-line filters. These 3 tips are the most inexpensive way to keep your hot melt system running smoothly.
The Lost Art of Troubleshooting
Troubleshooting is most definitely a lost art. In today’s throwaway society, we have lost touch with our ability to fix things ourselves. That is true in all aspects of business and most definitely prevalent in the packaging world.
For us, in the hot melt application industry, we have seen it get progressively worse over the last few years. Ever since the pandemic, it seems that most hot melt manufacturers no longer stand behind their equipment and help with troubleshooting. Industry giants, like Nordson, want you to buy new machines, they don’t want you to fix what you already have. Here at Universal Systems, that is the exact opposite of our company culture. We are here to help, we believe in our equipment, and that the art of troubleshooting isn’t something that should be lost forever.
That being said, troubleshooting a pump not running doesn’t mean hitting it with a wrench until it moves. There is an art to it. Using deductive thinking to pinpoint the cause of the issue versus just replacing each piece until it starts working again. For example, your line is running a multi-module gun, and the last module on the line isn’t getting glue. In order to figure out where the real issue lies you first need to make sure all of your key points are met. First, is your glue heated to the correct temperature? What is the consistency of the glue out of the first module in the gun versus the second, etc.? If the gun isn’t heated to temperature, your glue’s viscosity may not be correct to run through the manifold to all modules. Second, have you checked your in-line filters? There could be a clog in the filter not allowing enough glue to flow into the gun to get to all modules. There could also be a clog in manifold itself. Once you eliminate all potential variables, you will be able to deduct what your actual problem may be.
Training on equipment is also very important in practicing the art of troubleshooting. If you have line operators that understand how your equipment works, they will be better equipped to troubleshoot potential issues. If your line operators or floor managers are not fully versed with your equipment, you should be able to call the equipment manufacturer to go through troubleshooting steps with you. At Universal Systems, we pride ourselves in our customer service and ability to walk any customer through troubleshooting. If you have a manufacturer, like Nordson, that will not take that time with you, maybe it’s time for a change to USSE.
How Dirty Air Impacts Your Pneumatic Systems
Pneumatic hot melt systems are run by air in both the pump and the applicator guns. One of the most important ways to ensure the longest run time out of any pneumatic system is to make sure that the air is clean and dry. That can be easier said than done. Most all packaging facilities have oil, water, or debris in their air. That is just the way it is. Some factories will install air cleaning systems and then add lubricators to lines to ensure that other equipment that requires oil runs smoothly. But even with the most expensive and elaborate air filtration system, there will always be some type of substance that gets by and can lead to issues in the pneumatic pumps of hot melt units. The simplest solution is to install an oil removal filter regulator to the air line running to the pump.
Oily air is our most commonly found issue inside facilities that have pumps stop up. The reason is because the shifters are manufactured with very specific tolerance clearance between the shifter spool and sleeve. This design is a necessity in order to get the pump to shift. Too much clearance and the air will just blow by the spool, never building up enough air pressure to pump. Too little clearance and the shifter will jam. That being said, if you have oily air or dirty air being run through the shifter, over time, that will cause a film to build up inside the shifter and cause a jam. Depending on the amount of oil or dirt in your air, and the number of hours the systems is run for, will determine how long this will take to happen. However, if you feel like your facility air is questionable, we suggest that you use the oil-removal filter regulator to prevent any shifter stop ups.
Another pump issue that can be caused by dirty or oily air is that it can get into the air motor and damage the rulon seals. The seals need to be tight to snuggly move up and down the air motor and if they get damaged by oil or dirt, that can lead to your pump not efficiently pumping. These seals can be replaced over time and should be checked every 2,000 hours.
Universal Systems offers pump rebuild kits for the seals, as well as sells the shifter valves in case you ever run into a pump issue caused by dirty, oily air. For more information on our pump rebuilding services, or for any technical support you might need, please call (561) 272-5542 or email sales@ussefl.com.
Cold Weather Impacts Your Hot Glue
Most facilities are located in parts of the US impacted by the cold weather months. As the weather gets colder, so does the interior of the factories where most packaging lines operate. It seems like common sense that as the environment around your hot melt system gets colder, so will your hot glue unless you increase the temperature. Below are a few key factors to realizing you need to up your temperature.
Hot Melt Consistency
Hot melt consistency is the number one problem in most high-speed packaging lines during the winter months. This includes not only the consistency of the glue within the heated reservoir, but also the consistency of the glue to stay at temperature as it travels down that line. Just because your glue looks viscous inside the pot, doesn’t mean it is holding the same viscosity throughout the travel process. If your glue looks stringy or your guns are not firing consistently, then you most likely have a glue temperature problem. Try increasing the temperature of the tank, hoses and guns by 15 degrees. Please note that your hoses and guns should already be set 15 degrees higher than your tank. A minor adjustment like this will not char your glue, but should help keep it consistently viscous throughout the travel process.
Locate Cold Joints
Another important task would be to inspect your system setup for any cold joints. A cold joint would be any unnecessary extensions that you have added throughout the adhesive application process. Most cold joints are found on older machines that use larger sized extensions and filter housings. The more cold joints on the system, the more inconsistent the glue will heat and stay heated throughout the entire application process. If you cannot eliminate cold joints, increasing the temperature settings of the tank, hoses and guns will be helpful.
Location of your Line
One of the most important things to look at is where your packaging line is located within your facility. Most melters are located at the end of the line, which leaves them close to an exterior wall, door or window. The cold temperature outside could be impacting, not only the viscosity of your glue, but the heating time of your glue and its adhesion ability. Every time your line operator opens the fill door on the hot melt tank, the external air hits the existing glue and cools it off. Even if the lid on your tank is only open for a few minutes, that could impact not only the current glue in the tank reservoir, but the glue you are adding to the tank. If your glue pellets are colder than normal, it will take a longer amount of time to heat them. Since you cannot move the line, increasing the set temperature of your tank, hoses and guns will help eliminate glue inconsistency during the winter months.
If you have any questions about how to reduce the impact of winter weather on your hot melt system, please reach out to a technical rep at sales@ussefl.com.
When to Use a Water-Washdown Hose & Gun
Water washdown hoses and guns are important for plants that package items required by the FDA to get washed down with water either during or after operating hours. Water washdown hoses and guns are different than our standard high flex hoses and standard guns. The difference between the two is easy to tell. Washdown hoses and guns have a high temperature, extremely durable, waterproof jacketing encasing the electronics of each item. The connectors for each are also different than a standard set up. For washdown hoses and guns, the connectors will be a round pin connector, lined with a silicone seal and screw on connection plate for a water tight fit. Standard hoses and guns come with a rectangular connector that simply snaps into place. Washdown guns are also equipped with water tight gasketing on either end plate to ensure that the heating element and RTD are safe from any high powered washdown practices.
For more information on Universal Systems’ wide range of washdown products, please contact a sales rep at sales@ussefl.com
Lowering Downtime on Your Packaging Line
As CPGs continue to change their packaging lines to try and cut costs but stabilize runtime, there are a few things to consider when analyzing the cause of machine downtime and how to prevent it.
The below statistics were taken from the Fall 2021 issue of OEM Magazine:
Causes reports by respondents at CPG companies as the most common cause of packaging machine downtime: 26.3% general wear and tear, 21.1% operator error, & 22.1% product changeover.
General wear and tear is pretty self-explanatory. This would depend on how many hours and days per week a facility runs their packaging lines. If they are running 24/7, then the percentage of general replacement parts purchased will be higher than a plant that is only open 8 hours per day, 5 days a week. To lower downtime, each facility should stock at least 1 -3 replacements, at all times, of the following items: Heated Hoses, Glue Applicators, Modules, Nozzles, Tank filters, and In-Line filters. Another way to lower downtime is preventative maintenance. If CPGs were to prioritize preventative maintenance, then their packaging machinery would last longer and lead to less overall downtime. We recommend PM practices that include changing tank and gun filters, as well as maintaining an even level of heated glue in the glue reservoir of the tank. If done on the regular, general wear and tear percentages would go down.
Operator error is also another large concern for CPGs and the cause of most packaging line downtime. That is because Nordson® and other large corporate OEMs are making their melters more technologically advanced. Unfortunately, this increased technology does not come with increased training. While technology can create less human interaction, if the line operators are not trained on how to work the equipment, it can lead to more errors. Also, several of the new systems need to run on a network in order to work, so if there is any network downtime, that will now impact the packaging machinery and shut down the line. Universal Systems has maintained our simple to use systems and provides YouTube videos on how to work our machines, along with error codes and how to navigate the control board.
The final most common cause of packaging line downtime is product changeover. To lower overall costs, many CPGs use the same machines to package multiple types of items, which requires a changeover of parts. This downtime might be harder to avoid, however if the line operators are well versed in the machinery and understand the usage need of the machine in all areas, this can be lowered.
For more information on our Universal Systems line of hot melt products, please contact a sales rep at sales@ussefl.com.
Remote Buying & Troubleshooting is the New Reality
After the world shut down in 2020, then slowly started to reopen, it became clear that certain job roles no longer needed to be in an office and could work from home. For the packaged goods industry, that impacted purchasing agents. Now, as maintenance managers run the floor and manage the inventory, purchasing agents are at home trying best to communicate the company needs to suppliers. Realizing the potential that purchasing departments might rely on supplier websites, here at Universal Systems, we focused on updating our website and making sure that there are competitor OEM cross reference numbers easily searchable throughout the site. We also have sales reps that can handle almost any product question and return quotes within 24 hours.
Another impact the pandemic has had on the packaging industry is workforce. There might not be as many skilled and experienced engineers on the floor to troubleshoot issues as they arise. As a manufacturer, we have also experienced setbacks with sending technical reps out to facilities to help them troubleshoot. In an effort to virtually help our customers, we provided YouTube videos on how to set up our ProBilt line of tanks, how to program our control boards and how to set temperatures. We also have several very skilled engineers in house that can walk customers through any issue they may be experiencing. We’ve found ourselves utilizing technology more and more for troubleshooting. Since less techs are allowed in facilities, we have started doing virtual meeting via Facetime or through texting photos. Both have shown to be pretty effective.
Hopefully, one day soon, we get back to workers being allowed to be in the office to physically check inventory and see what they need to order. But until then, we will continue to help our customers as much as we can remotely. If you have any hot melt questions, please feel free to reach out to sales@ussefl.com.
How to Effectively Clean Your Melter
Keeping your hot melt adhesive system clean may not be on the top of your priority list. However, take a look at your melter now, it is probably bronzed and blackened with old melted glue and char in the glue reservoir. That is what travels through your application system and onto your boxes. That is also what is potentially causing clogging issues and why you are replacing so many nozzles. Even though your melter looks like this now, it is possible to clean it and positively impact the longevity of your system. We recommend that you clean your system at least once every quarter. If you are running 24-hour shifts, 7 days a week, then you might want to schedule cleaning once a month.
Universal Systems SE sells a product called Purge Plus™ that, when used properly, will clean almost any melter. The directions for use are simple:
- Drain all hot melt from tank reservoir
- Fill reservoir with Purge Plus™
- Heat Purge Plus to 350°F – 375°F for approximately 45 minutes
- Open tank drain valve and remove tank filter assembly
- Slowly start pump and run Purge Plus™ through the tank manifold and into a meal container until reservoir is empty
- Stop pump, replace filter assembly and close drain valve
- Carefully wipe any remaining contaminants from tank reservoir
- Add new hot melt and recirculate through system
- Drain one cup from each hose
In addition to cleaning the tank reservoir and heated hot melt hoses, if you are running a ProBilt™ series melter, the exterior is manufactured out of 316 grade stainless steel. So, any stainless steel cleaner will shine the exterior of the tank.
For any additional questions about Purge Plus or how to properly clean your tank and hoses, please call a Universal Systems service technician at (561) 272-5442 or email tech@ussefl.com.
When to Replace a Module
One of the most commonly replaced items on any hot melt packaging line is the module. Typically confused with an applicator gun head, the module attaches to the front of the applicator gun and dispenses the glue through the nozzle and onto the applicable surface. If you are experiencing clogging issues with your hot melt line or dripping from the tip of the nozzle, most likely the module has reached it’s end of life and needs to be replaced.
Replacing a module is fairly simple. First make sure the air is disconnected from the applicator. Always wear Kevlar gloves and eye protection when replacing any parts on your active hot melt system. The parts get hot and extending downtime might not be an option, so operator safety is very important. Then, remove the front two screws from the module and pull the module off the surface of the gun manifold. Make sure that you use the new o-rings and screws that come in your new module replacement kit. This will ensure that the new seal is tight and will not leak once operations restart. Also, make sure you are replacing the existing module with the correct replacement module. Below is a list of module options:
- Standard H200 Module
- Reduced Cavity H200 Module
- ProBead Self-Cleaning Module
- Zero Cavity Standard H200 Module
- Zero Cavity Micro Adjust H200 Module
- Swirl Pattern Modules
- Weave Pattern Modules
- H20 Modules
Finally, we also recommend to put a new nozzle on every new module. This will ensure that no clogging will occur. If you have a zero cavity or ProBead module, then the nozzle will already be attached.
If you need any more information about modules for your packaging line, please email sales@ussefl.com or call (561) 272-5442.
How to Change Out a Melter Pump
There are several reasons why a melter’s pump might stop working. The most common reasons are clogging of the ball and seat from foreign matter such as carton dust, and the actuator clogging due to dirty or oily air. No matter what the reason, if your pump stops pumping it needs to be replaced. Obviously, it much more cost effective to change out a pump then to replace the entire unit. However, it is not always easy to switch out a pump, especially if you are new to the line. Below are a few tips to help ease you through the process.
- Make sure the circuit breaker on the front of the unit is set to OFF once the applicator has reached normal application temperature.
- Shut OFF the input air to the pump.
- Set the pump regulator to zero and trigger all guns to relieve system pressure.
- When removing the old pump, rotate it slightly to break the suction and then pull it straight up and out.
- When installing the new pump, make sure to torque the screws 15-16 ft-lbs.
- Connect the pump electrical plug to tank receptacle and turn tank back on.
- Once the tank board reads that the tank has reached set temperature, wait 15 minutes. This will allow the glue around the pump hydraulics to get to temperature.
- After waiting 15 minutes, reinstall the air regulator and connect the airline and activate air.
If you have any further technical questions and want to speak with a technical sales rep, please call (561) 272-5442 or email sales@ussefl.com.