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Frequently Asked Questions

Got questions? We've got answers. Find the most important information about our systems, applications, and services right here. And if something is missing - let us know. We're always happy to learn from you.

 

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Fundamentals & Technology

  • 'Jetting' means that the dispensing medium detaches from the dispensing nozzle without the need for a wiping motion. This means the droplet is "shot" onto the target. Advantages of this process are:

    1. Faster (more drops per second)
    2. Less mechanical travel (e.g., no z-axis movement required)
    3. More tolerant of substrate height variations
    4. Reaches difficult-to-access dispensing points

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  • Microdispensing at VERMES refers to dispensing volumes of typically 1 nl to several microliters. Less than 1 nl is possible; larger volumes can also make sense depending on the material and application requirements.

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  • The jet valve is the central component in non-contact dispensing; a rapidly closing needle pushes the dispensing medium – supplied under constant material feed pressure - out through a nozzle. The forces generated at the nozzle cause very rapid acceleration of the exiting dispensing medium, so that the fluid is applied directly onto the substrate without deflecting horizontally or vertically. Typical fields of application include electronics manufacturing, medical technology, the semiconductor industry, automotive, and aerospace.

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  • Viscosity is a measure of the flow resistance of a fluid. It determines how thick or thin a substance flows. A distinction is made between dynamic viscosity (Pas or mPas) and kinematic viscosity (m²/s in relation to density).

    VERMES classifies fluids according to dynamic viscosity:

    • Low-viscosity media: VERMES defines this range between 1 mPas (e.g., water) and approx. 300 mPas
    • Medium-viscosity media: VERMES defines this range up to approx. 8,000 mPas
    • High-viscosity media: VERMES defines this range from approx. 8,000 mPas upwards

    Among other criteria, this classification is used to select the appropriate dispensing valve.

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  • All liquids and solids that can currently be melted (liquefied) at up to 230 °C. Common media include: adhesives, solder pastes, fluxes, oils and greases, chocolate, polyurethane materials (PU), and many more.

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Product System & Components

  • A VERMES dispensing system consists of a controller and a valve, including fluid box, material supply, and additional accessories required for operation such as connecting cables. Optionally, heating or cooling with the appropriate control unit can be added.

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  • A VERMES fluid box is the fluid-carrying part of the system, designed to convey the medium to the nozzle.

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  • The variants depend on the respective dispensing valve but can generally be characterized by the following attributes: heatable fluid box, tool-free bayonet fixing, screw fixing, low dead volume "LDV", and special variants for dispensing anaerobic adhesives and cyanoacrylates.

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  • The VERMES needle and nozzle insert are essential parts of the dispensing system. The valve drive moves the needle into the nozzle insert to dispense a droplet. They differ in size, shape and material. Selection is primarily based on the dispensing material, dispensing volume and other application-specific criteria.

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  • The Adjust at VERMES means that the positioning of the needle and nozzle insert are precisely matched to each other in order to obtain a sealed and reproducible dispensing system. The key advantage of the Adjust is a consistently reproducible dispensing result after every fluid box change, as well as a reduced source of error during ongoing operation.

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  • A VERMES Hotmelt dispensing system provides the fundamental capability of melting solids at temperatures up to 230 °C, making them dispensable in liquid form. Classic application areas range from bonding and fixing components with standard hot-melt adhesives through to dispensing liquid metals.

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  • DST (Dynamic Shockwave Technology) describes a pneumatic drive concept developed and patented by VERMES. The DST technology is used in, among others, the MDS 1000 Series and enables significantly faster and more precise dispensing compared to other pneumatic concepts.

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System Selection & Application Consulting

  • The reasons are varied. In most cases, jet valves make processes faster, more cost-efficient and easier to execute. In some cases, dispensing is only possible using a jet valve. Concrete decision criteria for a jet valve include:

    • High cycle rate required (several hundred drops per second)
    • No or limited z-axis movement available on the system
    • Difficult-to-access or recessed dispensing points
    • Substrate height variations that make contact-based dispensing difficult
    • Requirements for very small, precise dispensing volumes in the nano-liter range

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  • The selection depends on the application, the properties of the dispensing medium, and further details such as the desired dispensing volume. We are happy to advise you personally and also offer test runs for evaluation purposes.

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  • In principle, dispensing of dots, lines and areas is possible. In addition, a spray application pattern can also be realized.

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  • Fluid box heating is frequently used to reduce the viscosity of the dispensing medium in order to enable optimal dispensing. It can also be used to compensate for the influence of fluctuating ambient temperatures on the dispensing medium.

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Parameters, Operation & Troubleshooting
  • ParameterNameMeaning
    RIRisingRise time of the needle during the opening process
    FAFallingFall time of the needle during the closing process – affects the droplet velocity
    OTOpen TimeTime period during which the valve is open and the dispensing medium can exit
    NLNeedle LiftStroke of the needle – has a major influence on droplet size
    NPNumber of PulsesNumber of dispensing pulses per trigger signal
    PRCPressure CartridgeMaterial feed pressure at the cartridge – affects material flow
    PRAPressure ActuatorDrive pressure of the valve actuator
    CTClose TimeTime period between two dispensing pulses (pause)
    NTNozzle TemperatureNozzle temperature – relevant for temperature-sensitive media
    CHTCartridge Heater TemperatureTemperature of the cartridge heater – keeps the medium at process temperature

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  • In principle, all VERMES parameters have an influence on the dispensing result. The most important relationships are:

    • NL (Needle Lift): Greater stroke → larger droplet volume and higher droplet velocity, improved droplet detachment
    • OT (Open Time): Longer open time → larger droplet volume
    • PRC (Pressure Cartridge): Higher feed pressure → larger droplet volume and higher droplet velocity
    • FA (Falling): Faster closing → higher kinetic energy in the droplet, improved droplet detachment
    • NT / CHT: Higher temperature → lower viscosity → altered flow behaviour and easier droplet detachment

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  • Precision and repeatability can be considered very high. However, the exact values depend on many individual process and material properties. We are happy to share benchmark values or conduct targeted, application-specific tests on your behalf.

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  • Depending on requirements, the dispensing system can be operated and integrated in various ways. In principle, operation in Single-Shot, Infinite, Burst and External mode is possible. Please contact us for further details.

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  • This can be done in a variety of ways, e.g., via pressure tanks, cartridges, etc. VERMES offers a wide range of adapters for this purpose.

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  • Cleaning procedures vary depending on the dispensing material. In general, suitable cleaning agents or solvents are used in combination with an ultrasonic bath. VERMES offers cleaning tools specifically designed for its dispensing systems.

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Integration & Process Control

  • In principle, a VERMES dispensing system only requires a 5 V or 24 V trigger signal for dispensing. This makes it possible to integrate a VERMES dispensing system into virtually any machine platform. Additional interfaces are available for more in-depth integrations.

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  • To monitor the dispensed volume, VERMES offers the DVS (Drop Volume System). This measures the dispensed volumes and outputs the values in near real time. In addition, an optical process control system can be evaluated, which can provide information on dispensed volume, nozzle contamination, satellite formation, missing dispensing events, and more. We are happy to advise you on this topic!

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Industries, Applications & Company

  • VERMES serves all industries and sectors where very small quantities need to be dispensed precisely and quickly. This typically begins in the laboratory or process pre-development stage and extends through to high-volume series production.

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  • VERMES has been active in the field of non-contact microdispensing for over 25 years and is regarded as both a pioneer and innovator of state-of-the-art dispensing concepts. VERMES stands out in particular through its high degree of customization. Thanks to a modular system approach, customer-specific solutions can be configured using VERMES components. Where the required component does not yet exist, VERMES can develop custom fluid boxes, special nozzles, and tailored system solutions – from individual components through to fully integrated OEM systems – accompanying customers from initial application consulting and dispensing tests all the way through to series production.

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  • VERMES offers customers individual consulting as well as the possibility of carrying out targeted dispensing tests in-house to develop application-specific solutions. This applies regardless of whether the application is small or large in scale.

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  • Yes, VERMES offers both customized special dispensing solutions and OEM development. We develop tailor-made dispensing solutions precisely aligned with the individual requirements of our customers – from adapting existing systems through to complete custom solutions. Within the framework of OEM partnerships, we work closely with machine manufacturers and integrate our dispensing components seamlessly into their overall systems.

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  • Being close to our customers and globally represented is important to VERMES. You can find our current subsidiaries and partners here  www.vermes.com/company/locations

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