{"id":28089,"date":"2026-06-22T19:55:44","date_gmt":"2026-06-22T17:55:44","guid":{"rendered":"https:\/\/mtarobotics.com\/contactless-microdispensing-demanding-materials\/"},"modified":"2026-06-22T19:55:44","modified_gmt":"2026-06-22T17:55:44","slug":"contactless-microdispensing-demanding-materials","status":"publish","type":"post","link":"https:\/\/mtarobotics.com\/de\/contactless-microdispensing-demanding-materials\/","title":{"rendered":"How Contactless Microdispensing Improves Accuracy for Demanding Materials"},"content":{"rendered":"

Some materials cooperate on a production line, and some fight at every step. The difficult ones tend to share a trait, since they react, clog, or separate the moment a nozzle touches them. Contactless microdispensing offers a way around that fight, applying very small fluid volumes as discrete droplets that never make contact with the part.<\/p>\n

The approach pairs high speed with tight accuracy, placing droplets as small as 250 micrometers at up to 300 shots per second while holding repeatability above 99 percent. A hands-off method like this draws manufacturers in electronics, automotive, and medical lines toward it when a formula refuses to behave. Precise volumetric pumps still handle the bulk of dispensing work. Meanwhile, contactless microdispensing steps in as the specialist for jobs where contact itself becomes the obstacle.<\/p>\n

Why Some Materials Demand Contactless Microdispensing<\/h2>\n

Every dispensing method has a comfort zone, and contact application is no exception. It serves a wide range of work reliably, yet certain materials sit firmly outside that zone. Furthermore, they expose the same weakness every time. Fast-curing chemistries, abrasive-filled pastes, and materials with very short reaction windows all run into trouble at the moment of contact.<\/p>\n

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\u200bCyanoacrylates Cure the Instant They Meet Moisture<\/h3>\n

A fast room-temperature cure is exactly why engineers reach for cyanoacrylates, since parts can move to the next station almost immediately after joining. The same property works against the dispensing process. <\/p>\n

Adhesive reacts with ambient moisture inside the fluid path just as readily as it does on the part. Material skins over and hardens in the nozzle before the next shot arrives. When this happens, a single clog can idle a line until someone clears it.<\/p>\n

Peristaltic pumps, common for these single-component adhesives, add a second problem on top of the curing risk. The dose volume they deliver varies with temperature, viscosity, line pressure, and the material's pot life, so the bead changes shape and weight throughout<\/p>\n

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  • Quality drift<\/strong> – Fluctuating dose volume, weight, and shape produce uneven results from part to part. Tight-tolerance bonds in medical or sensor work are the first to fail.<\/li>\n
  • Rising costs<\/strong> – Scrap, higher material consumption, and added cleaning labor all eat into margin, which stings most with the expensive reactive formulas.<\/li>\n
  • Lost time<\/strong> – Clogged fluid paths force the line to stop for clearing or teardown. The stoppages rarely arrive at a convenient point in the shift.<\/li>\n<\/ul>\n

    Silver-Filled Thermal Interface Materials Punish Dead Space<\/h3>\n

    Silver-filled thermal interface materials contain a high density of precious-metal particles. This makes them abrasive, costly, and unforgiving in handling. Their job is to move heat away from sensitive components, and they can only do it when the fillers stay evenly distributed and the layer goes down free of air. Both conditions are difficult to hold during contact application, where the material spends time inside large pump cavities under constant mechanical shear.<\/p>\n

    The trouble shows up as broken lines, trapped air bubbles, and material that keeps flowing after the shot. Dead spaces inside the metering system compound the damage. Mixed material lingers in those cavities and contaminates the fresh material feeding behind it. The contamination gradually shifts the dosing behavior over time, so a process that passed inspection can drift out later.<\/p>\n

    The two cases differ in their chemistry and their symptoms, yet they share one root cause. Contact paired with a formula that will not wait is a combination that exact metering alone cannot rescue. This is where contactless microdispensing systems<\/a> can help resolve the issue.<\/p>\n

    Choosing Between Volumetric Pumps and Contactless Microdispensing<\/h2>\n

    A verdict against mechanical pumps would misread the situation entirely. Most dispensing tasks are still best served by volumetric pumps<\/a>, and the choice between them and jetting depends on material and geometry rather than on which is more accurate. Both families are precise, and each is the right answer for a different kind of work.<\/p>\n

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    The Volumetric Pumps Are Precise by Design<\/h3>\n

    Mechanical pumps anchor the majority of dispensing applications. Their accuracy comes from a mechanically defined dose rather than from avoiding contact. Each pump suits a different material range, so the two cover a broad span of work between them.<\/p>\n

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    • NVD reciprocating piston pump<\/strong> – A high-precision dispenser with no seals in its ceramic piston-cylinder system. This delivers adjustable volumes from 0.1 to 1,250 cubic millimeters with repeatability above 99 percent.<\/li>\n
    • CFD eccentric screw pump<\/strong> – Extremely accurate and repeatable across low-viscosity, high-viscosity, and filled materials, with flow rate directly proportional to drive speed.<\/li>\n<\/ul>\n

      Volumetric pumps shine where the application calls for controlled beads, potting, conformal coating, or larger deposits along complex contours. The CFD eccentric screw pump<\/a> lays down long beads with consistent diameters. Both technologies pair with dynamic mixing chambers for two-component work that maximizes pot life. A mechanically defined dose provides the source of accuracy in these processes, and contact with the part incurs no penalty at all.<\/p>\n

      When Jetting Is the Better Tool for Contactless Microdispensing<\/h3>\n

      Contactless microdispensing processes<\/a> earn the nod when contact itself is the problem rather than the volume. A few signals point clearly toward jetting. They tend to appear together on the materials that cause the most trouble.<\/p>\n

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      • Reactive chemistry<\/strong> – A material that cures or hardens on contact, such as cyanoacrylate, fares far better when nothing touches it.<\/li>\n
      • Abrasive-filled paste<\/strong> – A highly filled material sensitive to dead space, such as silver-filled TIM, benefits from the minimal internal volume of a jet valve.<\/li>\n
      • Awkward geometry<\/strong> – A part that demands horizontal or overhead shots without a vertical feed motion suits the free-space reach of jetting.<\/li>\n<\/ul>\n

        A single platform can carry both technologies, since the PDos X1 mounts on the TR300 table-top robot<\/a>, the MRC500 robotic cell<\/a>, and OEM configurations<\/a>. The practical sequence stays simple in nearly every case, starting with the material, moving to the geometry, then weighing the cycle-time target, and the right technology tends to choose itself.<\/p>\n

        Match the Method to the Material<\/h2>\n

        Removing contact, not tightening tolerance, is what rescues a difficult material. Cyanoacrylate stops curing in the fluid path, and silver-filled paste stops separating in dead space. Volumetric pumps still own most beads, potting, and coating work. Contactless microdispensing takes the formulas that punish any nozzle that touches them.<\/p>\n

        The material and the geometry settle the choice long before a specification sheet does. mta robotics confirms it by testing your actual material in the dispensing laboratory and backing the result with a process guarantee. Reach out<\/a> to the mta robotics team to arrange an evaluation and find the dispensing approach that fits your line.<\/p>\n