SONDERHOFF 3E SIL with DM 50x Technology

The standardized SONDERHOFF 3E SIL dosing cell is designed for simple standard applications with Formed-In-Place (FIP) technology and processes and dispenses very precise 2K silicone systems with symmetrical mixing ratios.

You can use the 3E SIL for part sealing with 2-component silicone foam or for non-foamed 2K material systems such as potting compounds and silicone-based adhesives.

The parts are positioned either manually in the working 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.

On the 3E SIL, the MK 825 PLUS precision mixing head ensures dynamic and homogeneous mixing of the two material components. It doses precisely according to the defined mixing ratio – a prerequisite for high quality silicone applications.

The 2K silicone system used is applied to the part fully automatically with the CNC-controlled mixing head and high repeat accuracy.

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 SIL enables very short payback times, and the high degree of standardization usually shortens delivery times.

Optimized Process Evaluation and Control

The new MK 825 PLUS mixing head in used for the 3E SIL features innovative improvements. They ensure maximum process stability in the fully automatic dispensing of the 2K silicone 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 measurement 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 SIL

The Entry-level Model for Typical Standard Applications

The Compact Class for 2K Silicone Applications

MK 825 PLUS

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

In the SONDERHOFF 3E SIL dosing cell, the MK 825 PLUS precision mixing head is used for two material components. In the mixing head, the material components are mixed dynamically and homogeneously and dosed onto the part in precise quantities for material application.

The MK 825 PLUS is designed for a dosing rate of 0.2 to 3.0 g/s with a continuously infinitely adjustable mixing ratio of 1 : 10 to 10 : 1 and a dosing accuracy of ±1%.

The MK 825 PLUS mixing head 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 its 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 PLUS 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 SIL 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 with optimized sizes for the symmetrical mixing ratios of the A and B components of the 2K silicone 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 SIL:

• 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
• 44 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
• Three-phase agitator running at 99 rpm for tank A
• Automatic air loading
• Precision gear pumps: Delivery rate 0.75 ccm/rev for the A and B components of the 2K silicone systems
• Hose package: Steel-coated PTFE high-pressure hoses for the A and B components with stainless steel VA fittings, recirculation hose package

The Different Components of the Dosing Cell 3E SIL