Drei Bond provides individual solutions and custom-made systems for extremely diverse dosing requirements. With extensive experience in the construction of special machines that integrate the latest control technology Drei Bond experts are also ideally placed to develop solutions for complex requirements in close consultation with customers. The Drei Bond engineers and technicians are on hand to advise customers at every stage of their project, whether in the design, planning or implementation phase.
It goes without saying the Drei Bond application technology is available to provide support through extensive trialling and testing in the context of projects.
Drei Bond integrates an extremely varied range of dosing techniques in its semi- and fully automatic dosing systems. Depending on the requirements, manual dosing systems are also used. The ideal application technique will be chosen following an in-depth survey of the application area, component geometry, dosing medium and quality requirements.
Conventional pressure/time dosing systems and volume-control systems are available to ensure the best result for each dosing process.
In volumetric dosing the delivered dose depends on the volume transport.
A preset, defined volume is particularly suitable for products whose viscosity changes under fluctuating ambient temperatures or whose flow characteristics are subject to variations at different stages of the process. Volumetric dosing ensures high dosing quality for these types of products.
Volumetric dosing is suitable for a variety of application areas, from adhesives and sealants to oils and greases. The dosing options range from the point application of extremely small volumes (micrograms/µg) to drop application.
Time-pressure dosing is the traditional method of applying liquid dosing media. The fluid is directly controlled by the dosing pressure, aperture angle and opening time of the dosing valve in the system.
In an axis/coordinates system for example, the dosing bead is controlled in combination with the specified application speed as required. In combination with medium tempering, this allows for extremely diverse dosing media to be evenly applied, irrespective of the ambient temperature.
This is also a well-established dosing technique for oiling and greasing, as well as for other applications.
Drei Bond supplies individual products for medium delivery, dosing valve units and control technology. These components and systems effortlessly integrate with customer stations. Typical applications include connection to CNC axis systems, robots and pneumatic units.
Adapted container systems allow for the delivery of extremely varied media, such as grease, oil, adhesives and sealants, silicones and epoxy resins. Supplied containers such as cartridges, drums and hobbocks can also be used. Drei Bond also supplies emptying and decanting systems for various containers.
Drei Bond's product range includes cartridge systems for manual dosing devices as well as semi- and fully automatic systems. The cartridge holder type can be adapted to suit the container used. Tempering for improved dosing of sensitive media is also possible.
Drei Bond pumps are specifically designed for the container, e.g. 20 kg hobbocks.
A range of sizes are available ensuring the most diverse systems can be supplied. Pump stations are ideal for highly viscous media that require a high delivery pressure.
The pump stations can be used as a single or dual pump. With dual pump systems the drum can be changed during production, avoiding the need for downtime or stoppages.
The pumps are very versatile and have a wide range of applications: whether as a special solution for media delivery at individual manual workstations or as a centralised system for multiple delivery points.
Tanks are available in sizes ranging from one to 60 litres capacity. Depending on the application and medium used, Drei Bond tanks can be fitted with a:
- mixer to prevent the medium separating
- heating element for product tempering
- special linings and inserts for processing anaerobic media
Dual tank stations with automatic container reversing are used for assembly lines. These allow for tank containers to be replenished while production is ongoing, avoiding the need for downtime or stoppages.
It goes without saying that a ring main with automatic filling can also be connected.
The product is drawn down from the floor of the container. This prevents air pockets and allows all the residue to be drawn off. For oil dosing, oil filters with integrated clogging indicators are used, plus a suitable distributor for multiple delivery points.
Drei Bond supplies a range of dosing valves for all areas of the industry, designed for the individual application of low to high viscosity media.
The range extends from precise needle seat valves and pneumatically controlled valves to a servo-actuated control system developed by ourselves.
Needle seat valves close the nozzles at the outlet itself and prevent the dosing medium dripping. They can also be used to prevent the medium curing, for example when silicone comes into contact with air humidity. This avoids the need for a buffer product into which the dosing nozzle has to be placed when not in use. The valve can also be individually adjusted to change the dosing volume.
The RKS control system is a dynamic valve and control system with integrated dosing volume control patented by Drei Bond that consistently delivers the same product volume via an aperture angle, irrespective of the travel speed. A servomotor controls the needle seat valve.
Helical rotor pump
Helical rotor pumps are particularly useful for abrasive, filled or shear-sensitive media. They are mainly used at Drei Bond when a consistent dosing quality is required for low to high-viscosity materials. Helical rotor pumps allow the delivery of beads or dots in variable amounts.
Helical rotor pumps work according to the displacement principle. They are made up of two main components: the rotor, which turns eccentrically, and the stator, a stationary part in which the rotor moves. Together they form the shape of a helix, hence the name "helical rotor pump". Depending on the size, the pump delivers a certain volume per revolution. It can be driven by a servo or stepper motor, among others.
The helical rotor pump offers greater reproducibility of dosing over time/pressure-controlled dosing systems. This applies to products that change their flow properties during dosing in particular (thixotropy). Dosing is dependent on the viscosity/temperature and thus the thickness of the medium to be delivered. If the thickness changes, so too does the dosing rate. To ensure greater reproducibility, appropriate controls, such as tempering, should therefore also be used with the helical rotor pump.
Diaphragm valves are suitable for dosing low to medium viscosity media in beads right through to microlitre-sized dots. A short opening stroke provides extremely fast closing. A knurled-head screw for adjusting the valve stroke facilitates fine adjustment of the dosing quantity.
The diaphragm valve is the functional principle requiring the least clearance volume. With other principles, some media can be deposited in the valve body, leading to the risk of cross contamination, i.e. two media coming into contact with one another. The diaphragm is the only part that comes into contact with the medium, as all mechanical components are outside of the wetted area. These valves are therefore used with anaerobic adhesives, for example, to prevent contact with metal valve components.
The pneumatically controlled diaphragm valve is also suitable for increased cycles.
Pinch valves are used for dosing liquid and paste-like materials.
The valve is controlled by feeding compressed air into the pneumatically controlled pinch valve. When inoperative, a piston compresses a specially designed piece of tubing. By feeding in control air, the piston is raised and the medium can pass through the squeeze tube. The dosing quantity depends on the duration for which the valve is open and the medium pressure set.
The only part of the valve that comes into contact with the medium to be dosed is the disposable squeeze tube.
These dosing valves are characterised by quick and simple cleaning of wetted parts and low maintenance costs.
Rotor spray dosing systems are suitable for wetting holes, internal threads and cylindrical components. The medium is placed in a centrifugal disc turning at high speed and then applied uniformly all around the inside of the component (360°).
Depending on the application, the product is supplied to the centrifugal disc from externally or through the rotor. The patented spring-loaded rotor carrier from Drei Bond prevents the rotor from being damaged by querying first whether the bore is "occupied" or "free".
The medium, bore diameter and the wetting level determine the shape of the centrifugal disc; forward and backward centrifuging is possible. Depending on the version, the rotors can be fed horizontally or vertically from above or below.
Bore diameters of 6-80 mm can be wetted. Uniform wetting of the entire bore right down to the bottom is also possible using an appropriate rotor design.
Depending on their design, these valves are suitable for dosing low to medium viscosity media. In addition to the medium to be dosed, spray air is fed into the valve, which atomises the medium when it exits the nozzle tip. Depending on the geometry of the nozzle, components can be wetted across their entire surface, in selected points or even circumferentially (360°).
This method also makes it possible to apply media finely and evenly to surfaces. These valves are therefore used, for example, for oiling, greasing and for corrosion protection.