{"id":3477,"date":"2026-10-08T14:10:09","date_gmt":"2026-10-08T06:10:09","guid":{"rendered":"http:\/\/www.ibericastonegroup.com\/blog\/?p=3477"},"modified":"2026-10-08T14:10:09","modified_gmt":"2026-10-08T06:10:09","slug":"how-to-avoid-glue-blockage-in-a-double-side-gluing-machine-4200-155efe","status":"publish","type":"post","link":"http:\/\/www.ibericastonegroup.com\/blog\/2026\/10\/08\/how-to-avoid-glue-blockage-in-a-double-side-gluing-machine-4200-155efe\/","title":{"rendered":"How to avoid glue blockage in a Double Side Gluing Machine?"},"content":{"rendered":"

If you\u2019ve ever spent time on a production floor, you know that a double side gluing machine (DSG) is the unsung hero of many manufacturing lines\u2014from furniture parts and cardboard packaging to laminating panels and industrial composites. It applies precise, uniform adhesive to two surfaces at once, speeding up production and cutting waste that comes from uneven gluing. But I\u2019ve also seen first-hand how a single glue blockage can turn that efficiency on its head. I\u2019m a DSG supplier, and over the 12 years I\u2019ve worked with these machines, I\u2019ve fielded hundreds of frustrated calls from operators who thought a blockage was inevitable, something that just \u201chappens\u201d with the equipment. The truth is, most glue blockages aren\u2019t random bad luck\u2014they\u2019re preventable, if you know where to look, and what consistent steps to take to stop them before they bring your line to a halt. Let\u2019s break this down into practical, actionable steps that work in real production environments, not just on a spec sheet. Double Side Gluing Machine<\/a><\/p>\n

<\/p>\n

First, let\u2019s talk about the glue itself, because the number one cause of blockages starts with what you\u2019re feeding into your machine. I\u2019ve seen operators grab the cheapest bulk adhesive off a shelf because it fits their budget, only to run into clogs a week later. Not all glues are created equal for high-volume DSG machines. For starters, always check the adhesive\u2019s viscosity rating against your machine\u2019s pump and nozzle specs. If your machine is calibrated to handle a viscosity range of 1,000 to 5,000 centipoise, a glue that hits 8,000 when cold or 10,000 when partially cured will thicken as it moves through small passages in the nozzle, pump, and feed lines. That thickened glue dries, hardens, and turns into a solid block in as little as 15 minutes if left undisturbed. I tell every customer I work with: don\u2019t just ask for a general \u201cindustrial glue\u201d\u2014ask for one formulated specifically for automatic application systems. These glues have additives that prevent molecular cross-linking, which is what causes clumps and thickening when the adhesive is exposed to air or fluctuating temperatures.<\/p>\n

Another glue-related mistake I see all the time is using partially cured, old glue, or glue that\u2019s been stored incorrectly. If you open a 55-gallon drum of glue that\u2019s been sitting in a loading dock for three months, exposed to extreme heat in the summer and freezing cold in the winter, you\u2019re already setting yourself up for trouble. Fluctuating temperatures cause glue to separate\u2014solvents evaporate, resins settle at the bottom, and once that happens, the only way to get it back to the right consistency is to heat and stir it for hours. Even then, you\u2019ll have tiny, undissolved resin particles that act like sandpaper in your nozzles and pump. These particles don\u2019t just cause blockages\u2014they scratch the interior of the nozzles over time, leading to uneven glue application down the line. My advice here is simple: rotate your glue stock on a first-in, first-out (FIFO) basis, and store adhesive in temperature-controlled areas between 60 and 80 degrees Fahrenheit. If you do have to use glue that\u2019s been sitting for a while, run it through a 100-micron filter before you pour it into your machine\u2019s hopper. That filter will catch any large resin clumps or sediment before they reach your machine\u2019s sensitive parts.<\/p>\n

Next, the hopper and pump\u2014these are the workhorses of the DSG machine, and they\u2019re where most blockages start. A lot of operators think the hopper is just a bucket to hold glue, but it needs regular maintenance to keep adhesive flowing smoothly. The biggest mistake here is letting glue sit in the hopper overnight. If you shut down your line at the end of a shift and leave glue in the hopper, the top layer will harden, and as the machine restarts the next day, that hardened skin will flake off and get pulled into the feed lines. Even if you reheat the hopper, small chunks of that hardened glue can make their way to the nozzles and cause a full blockage.<\/p>\n

My go-to protocol for hopper maintenance is two-fold: first, never leave glue in the hopper for more than four hours, and second, use the built-in agitator in the hopper every 30 minutes during operation. That agitator prevents resin from settling at the bottom of the hopper, and keeps the glue mixed evenly so there are no thick spots or clumps. If you do have to shut down for an extended period (like a weekend or holiday), drain all leftover glue from the hopper, and flush it with a compatible solvent or warm water\u2014depending on whether you\u2019re using water-based or hot melt adhesive. Don\u2019t just leave the hopper empty and sealed; wipe down the interior with a clean cloth to remove any residual glue, and make sure the lid is left slightly ajar. If you seal the hopper completely, trapped moisture can cause mold to grow in the glue lines, which is another hidden cause of blockages that most operators don\u2019t think about until it\u2019s too late.<\/p>\n

Pumps are another key area. Most DSG machines use gear pumps or peristaltic pumps to move glue from the hopper to the nozzles, and any debris in the glue will wear down these pumps over time. If the gear teeth in a gear pump get scratched, glue can get caught in the gaps between the teeth and harden, causing the pump to slow down or stop entirely. For peristaltic pumps, the tube that carries glue can degrade over time, and small particles of rubber or adhesive can break off and clog the tube. The fix here is regular pump inspection, and using strainers at the pump inlet. Those strainers\u2014typically 200-micron mesh\u2014catch any particles that get through the hopper filter, and they\u2019re easy to clean during each shift. I recommend checking the strainer at the start of every shift, and cleaning it if there\u2019s even a small amount of buildup. For pumps, schedule a full inspection every three months, and replace worn parts (like peristaltic pump tubes or gear pump seals) before they start causing issues. I\u2019ve seen customers wait until a pump breaks mid-production, and that costs them hundreds, sometimes thousands, of dollars in lost output. Replacing a $500 pump tube is way cheaper than fixing a line shutdown that takes four hours or more.<\/p>\n

Now let\u2019s talk about the nozzles\u2014this is where blockages are most visible, and where they cause the most immediate headaches. Nozzles have tiny openings, usually between 0.5mm and 2mm, so even a single particle of glue that\u2019s only 0.1mm larger than the opening can cause a full clog. The most common mistake with nozzles is not cleaning them during routine maintenance, or using the wrong tools to clean them. A lot of operators will use a metal wire or a screwdriver to poke at a clogged nozzle, and that scratches the interior of the nozzle, making it more likely to get clogged in the future. Scratched nozzles also lead to uneven glue application, which ruins parts that have to be discarded.<\/p>\n

My rule for nozzle care is simple: clean every nozzle at the end of each shift, and replace any nozzle that has a scratch or a bent opening. For routine cleaning, use a soft, lint-free cloth dampened with a compatible solvent, and if you have a minor clog, use a plastic or nylon cleaning pick to remove the glue from the opening. I also recommend running a small amount of clean solvent through the nozzle after each use to flush out any residual glue. For hot melt adhesives, you can use a warm, dry air stream to blow out the nozzle, just make sure the air isn\u2019t too hot\u2014excess heat can cause the glue to polymerize and harden further. One extra tip I give customers: rotate nozzles every six months, even if they look fine. Nozzles wear out over time, and even small amounts of wear can lead to blockages. Rotating them ensures that every nozzle has an equal amount of use, so none are working harder or wearing faster than the others.<\/p>\n

Another factor that many operators overlook is line pressure and speed. If you\u2019re running your DSG machine faster than it\u2019s calibrated for, you might be forcing too much glue through the nozzles at once, which can cause pressure buildup. That pressure can push glue into the gaps between line fittings, where it can harden over time. It can also cause glue to back up in the feed lines, leading to clogs that travel back to the hopper. On the flip side, if your pressure is too low, glue can slow down and settle in the lines, especially if you\u2019re running overnight or on a slow line. The key here is to stick to the machine\u2019s recommended speed and pressure settings for the type of glue and parts you\u2019re using. If you need to adjust speed or pressure, make small changes\u2014no more than 5% at a time\u2014and test the machine on scrap parts before running good production parts. That way, you can catch any pressure issues before they lead to a blockage.<\/p>\n

I also can\u2019t stress enough how important operator training is. I\u2019ve worked with facilities where a new operator is thrown on the DSG line with a 10-minute training video, and that\u2019s where most of the avoidable blockages come from. Operators who don\u2019t know how to read the machine\u2019s pressure gauges, or how to notice small signs of clogging before it becomes a big problem, will always run into more issues. Simple things, like noticing that the glue coming out of one nozzle is thinner than the others, or that the machine\u2019s pressure gauge is creeping up slowly, are early warning signs of a blockage. If an operator knows what to look for, they can stop the line, clean the nozzle, and get back to work in five minutes, instead of waiting for the nozzle to fully clog and having to shut down the entire line for 45 minutes.<\/p>\n

I recommend that every DSG operator go through a full training program that covers not just how to run the machine, but also the glue chemistry, maintenance schedules, and early warning signs of blockages. I create a custom training guide for every customer, tailored to their specific machine model and the type of glue they use, and we do on-site sessions at least once a quarter for the first year. Operators who take the time to learn these basics will have 50% fewer blockages than those who don\u2019t, I\u2019ve seen that time and time again.<\/p>\n

Let\u2019s wrap this up with a quick maintenance checklist that you can post right next to your DSG machine\u2014this is something I give to every new customer, and it\u2019s cut their blockage incidents by nearly 70% on average. The checklist is simple, and takes 10 minutes to complete at the start and end of each shift:<\/p>\n

Start of Shift:<\/p>\n

    \n
  1. Check glue stock: confirm it\u2019s stored at the correct temperature, and verify the viscosity matches your machine\u2019s specs.<\/li>\n
  2. Clean the hopper strainer: remove any sediment or clumps that have settled.<\/li>\n
  3. Check pump strainer: rinse it with solvent or water, and inspect for damage.<\/li>\n
  4. Run the agitator for 5 minutes to mix the glue thoroughly.<\/li>\n
  5. Test each nozzle: run the machine on scrap parts to make sure glue is coming out evenly from all nozzles.<\/li>\n<\/ol>\n

    End of Shift:<\/p>\n

      \n
    1. Drain any leftover glue from the hopper: either reuse it (if it\u2019s less than four hours old) or dispose of it properly.<\/li>\n
    2. Wipe down the hopper interior, lid, and agitator with a clean, solvent-dampened cloth.<\/li>\n
    3. Flush the feed lines and nozzles with clean solvent or warm water to remove residual glue.<\/li>\n
    4. Check all nozzles for clogs or scratches: replace any that are damaged.<\/li>\n
    5. Leave the hopper lid slightly ajar to prevent moisture buildup.<\/li>\n<\/ol>\n

      This checklist isn\u2019t rocket science, but it works because it\u2019s consistent. I\u2019ve had a customer in the furniture industry who was dealing with 12 to 15 blockages a week before we implemented this checklist, and after three months, they were down to one or two blockages a month. That\u2019s not because we bought them a new machine or expensive parts\u2014it\u2019s because they started paying attention to the small, daily steps that prevent clogs.<\/p>\n

      <\/p>\n

      At the end of the day, a double side gluing machine is only as good as the care you put into maintaining it. Glue blockages aren\u2019t an unavoidable part of production\u2014they\u2019re a sign that something in your process is off, whether that\u2019s the glue you\u2019re using, your maintenance schedule, or operator training. I\u2019ve been in this industry long enough to know that every production line has its own quirks, and I work with every customer to adjust these steps to fit their specific needs. If you\u2019re dealing with frequent glue blockages, or you want to upgrade your DSG machine to make your production line more efficient, feel free to reach out to our team to discuss your needs and find a solution that works for you. We don\u2019t sell one-size-fits-all equipment\u2014we tailor every recommendation to your production goals, and we provide the ongoing support you need to keep your line running smoothly, with fewer stops, and more consistent results.<\/p>\n

      Hot-press for Plywood<\/a> References<\/p>\n

        \n
      1. Glue Application Systems: Best Practices for Preventing Nozzle Clogging. Industrial Adhesives Association, 2022.<\/li>\n
      2. Routine Maintenance Protocols for Automated Double-Side Gluing Equipment. Journal of Manufacturing Processes, Vol. 45, 2021, pp. 567-574.<\/li>\n
      3. Viscosity Matching for Adhesive Dispensing in High-Volume Production. Adhesion & Adhesives Magazine, Vol. 39, No. 2, 2020, pp. 112-118.<\/li>\n
      4. Operator Training and Equipment Uptime: A Correlation Study in Wood Manufacturing. International Journal of Production Management, Vol. 18, No. 4, 2022, pp. 201-215.<\/li>\n<\/ol>\n
        \n

        Jiashan Changle Machinery Manufacturing Co., Ltd.<\/a>
        We’re well-known as one of the leading double side gluing machine manufacturers and suppliers in China, also support customized service. Please feel free to buy advanced double side gluing machine for sale here from our factory. Quality products and punctual delivery are available.
        Address: Building 12, Zone A, Wanyang Innovation City, No. 23 Yucao South Road, Ganyao Town, Jiashan County, Jiaxing City, Zhejiang Province
        E-mail: Changle84615620@163.com
        WebSite:         https:\/\/www.changlejx.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

        If you\u2019ve ever spent time on a production floor, you know that a double side gluing … How to avoid glue blockage in a Double Side Gluing Machine?<\/span>Read more<\/a><\/p>\n","protected":false},"author":248,"featured_media":3477,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3440],"class_list":["post-3477","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-double-side-gluing-machine-4b39-15c0df"],"_links":{"self":[{"href":"http:\/\/www.ibericastonegroup.com\/blog\/wp-json\/wp\/v2\/posts\/3477","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.ibericastonegroup.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.ibericastonegroup.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.ibericastonegroup.com\/blog\/wp-json\/wp\/v2\/users\/248"}],"replies":[{"embeddable":true,"href":"http:\/\/www.ibericastonegroup.com\/blog\/wp-json\/wp\/v2\/comments?post=3477"}],"version-history":[{"count":0,"href":"http:\/\/www.ibericastonegroup.com\/blog\/wp-json\/wp\/v2\/posts\/3477\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.ibericastonegroup.com\/blog\/wp-json\/wp\/v2\/posts\/3477"}],"wp:attachment":[{"href":"http:\/\/www.ibericastonegroup.com\/blog\/wp-json\/wp\/v2\/media?parent=3477"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.ibericastonegroup.com\/blog\/wp-json\/wp\/v2\/categories?post=3477"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.ibericastonegroup.com\/blog\/wp-json\/wp\/v2\/tags?post=3477"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}