SONDERHOFF 3E PUR with
DM 50X Technology

The standardized SONDERHOFF 3E PUR dosing cell is well suited for you if you want to use liquid, medium- to high-viscosity 2-component polyurethane foam systems with asymmetric mixing ratios for sealing your components.

You can also use the 3E PUR to process and dispense non-foamed 2-component material systems such as potting compounds and polyurethane-based adhesives very precisely.

The parts are positioned either manually in the work area of the dosing cell or on the optionally available sliding / shuttle table. For oversized parts, the two sliding tables can be connected to form a large worktable.

Only the MK 825 BASIC precision mixing head is available for the 3E PUR. Its performance spectrum is designed for typical standard applications. In its mixing chamber, the two material components of the polyurethane system used are mixed dynamically and homogeneously and are precisely dosed according to the defined mixing ratio – a prerequisite for high quality polyurethane applications.

The CNC-controlled mixing head then ensures repeat-accurate and fully automatic formed-in-place (FIP) application to the part. The maximum mixing head travel range of the linear robot is 2,500 x 1,250 x 250 mm (x/y/z).

A manually operated lift door separates the machine operator from the work area of the dosing cell, which is thus CE-compliant.

The attractive entry-level price of the 3E PUR enables very short payback times, and the high degree of standardization usually shortens delivery times.

Optimized Process Evaluation and Control

The new MK 825 BASIC mixing head in used for the 3E PUR features innovative improvements. They ensure maximum process stability in the fully automatic dispensing of the 2K polyurethane systems used.

The sensors installed in the mixing head continuously supply measurement data that enable the machine operator to monitor critical process parameters of the dispensing job during production. The data also informs when preventive maintenance of wear parts becomes necessary.

The automatic logging of all system, material and process data always ensures the traceability of the production sequence.

Dosing Cell 3E PUR

The Entry-level Model for Typical Standard Applications

The Compact Class for 3E PUR Applications

MK 825 BASIC

2-Component Mixing Head with High-pressure Water Rinsing and Dynamic Mixing

In the SONDERHOFF 3E PUR dosing cell, the MK 825 BASIC precision mixing head for 2 components with high-pressure water rinsing is used for mixing chamber cleaning. In the mixing head, the components are mixed dynamically and homogeneously, and the material system is dosed onto the part in precise quantities.

The MK 825 BASIC enables dosing from 0.2 to 3.0 g/s with continuously infinitely adjustable, asymmetrical mixing ratios from 10 : 1 to 1 : 2 and a dosing accuracy
of ±1 %.

The MK 825 BASIC is precisely guided within the travel range of 2,500 x 1,250 x 250 mm (x/y/z) by a 3-axis linear robot integrated in the cell. The linear robot with toothed belt drive is characterized by good stiffness. This allows the mixing head to be guided over the part being processed with very high repeatability.

Handling and Lift Door Operation

The machine operator places one or more parts on the prepared workpiece holder(s) within the working area of the dosing cell. He then closes the lifting door with a hand lever at the front of the machine. The fully automatic application of material to the part can start. For this purpose, the CNC-controlled MK 825 BASIC precision mixing head moves over the part contour.

To remove one or more parts after the dispensing process, the machine operator opens the lifting door using either the hand strap mounted there or the lever.

Dosing Machine Components and Material Pressure Tanks

In the SONDERHOFF 3E PUR dosing cell, the dosing machine components are mounted on the side of the cell. This is where e.g. the precision gear pumps, compressed air connection and dryer, and the maintenance unit and high-pressure water unit for ecological mixing head cleaning are located.

The double-walled material pressure tanks in the optimized sizes for the asymmetrical mixing ratios of the A and B components of the 2K polyurethane systems are also installed here.

The material pressure tanks are equipped with various sensors, indicating whether the pressure tank is empty or needs to be refilled. For the material pressure tanks, an extension with a refilling station for automating the material supply is possible on request. For that case there is an overfilling protection mechanism on the pressure tanks.

At a Glance:

Material Preparation for the 3E PUR:

• Material pressure tank with fill-level sensors, safety pressure valve (TÜV type-tested), overfilling protection and shut-off ball valve, with compressed air fittings and compressed air reducing valves for pre-pressure regulation of the tank pressures
• 44 l material pressure tank, double-walled, chrome-nickel steel for material component A
• 24 l material pressure tank, double-walled, chrome-nickel steel for material component B
• Optional: material supply through refilling stations (except the drum pumping station FPS) for containers from 20 to 1,000 liters
• Wire mesh filter cartridges and plate gap filters
• Three-phase agitator running at 99 rpm for tank A
• Automatic air loading
• Precision gear pumps: delivery rate 0.75 ccm/rev (material component A) and 0.3 ccm/rev (material component B)
• Hose package: material component A: fabric-reinforced polyamide high-pressure hose, material component B: steel-reinforced Teflon high-pressure hose, recirculation hose package

The Different Components of the Dosing Cell 3E PUR