Using the WIWA PU GUN 4040 Correctly: Manual or Automatic Gun – How to Succeed
The WIWA PU GUN 4040 is a pneumatically operated 2K spray gun for PUR foams/polyurethanes and fast-reacting systems such as polyurea – developed for ergonomic, fatigue-free work and flexibly adjustable via exchangeable mixing chambers and nozzles. In this guide, you will get a practical overview, guide values (no rigid "one-fits-all" settings), a professional workflow, and quick troubleshooting – with direct purchase CTAs for the appropriate variants.
Product Image
Note: Illustration may vary depending on the version/adapter/nozzle configuration.
Product Overview: Variants, Applications, Advantages (Table)
| Variant | Short Profile | Key Data | Typical Applications |
|---|---|---|---|
| Manual Gun WIWA PU GUN 4040 |
Ergonomic for manual coating, variable hose connections, suitable for round and flat spray nozzles. |
Max. Operating Pressure: 250 bar Max. Air Inlet Pressure: 8 bar Max. Material Temperature: 100 °C Gun Weight (Guide Value): 1.5 kg Output Range: 1.2–22 kg/min Part Number (Manufacturer): 0667480 Max. Flow Rate (Shop Info): 22 l/min |
Surface coating, repairs, hard-to-reach areas, changing nozzle/mixing chamber setups. |
| Automatic Gun WIWA PU GUN 4040 |
For automatic coating systems: Handle is replaced by an adapter, still flexibly configurable. |
Max. Operating Pressure: 250 bar Max. Air Inlet Pressure: 8 bar Max. Material Temperature: 100 °C Gun Weight (Guide Value): 1.25 kg Output Range: 1.2–22 kg/min Part Number (Manufacturer): 0667797 Max. Flow Rate (Shop Info): 22 l/min |
Series processes, reproducible paths/tracks, robotics/automation, partial automation. |
Guide values: Gun weights and performance range are taken from the WIWA brochure; flow rate (l/min) is listed as shop information. Both are design-specific depending on the setup (mixing chamber/nozzle/material).
CTA: Order the Right Version Directly
Want to get started right away or standardize your setup? Choose the variant that fits your process (manual operation vs. automatic/system).
Recommended Basic Settings (Derived from Data – as Guide Values)
The following points are guide values/start checks from the permissible limit data and the gun concept (2K mixing in the mixing chamber shortly before exit). Exact process values always depend on the material data sheet, system (pump/heater/hoses), and nozzle/mixing chamber.
- Pneumatics: Set air inlet pressure so that the process runs stably – max. 8 bar (limit value).
- Pressure Range: Operate system/material pressure within the safe working window – max. 250 bar (limit value).
- Material Temperature: Temper according to material specifications – max. 100 °C (limit value at the gun).
- Output/Delivery: Adjust via mixing chamber change and nozzle choice (round/flat spray possible). Standard setup: round spray mixing chamber + 60 mesh screen (guide value/reference).
- Performance Window: As a rough orientation framework 1.2–22 kg/min (material/setup sensitive).
Professional Workflow (5–7 Steps)
- Define Setup: Manual operation or automatic (adapter/handle configuration), appropriate hose routing, and ergonomic alignment of connections.
- Select Mixing Chamber & Nozzle: Round or flat spray, dimension the desired output via the matching mixing chamber.
- Check Screen/Filter: Insert material screen (e.g., 60 mesh in standard setup) and ensure cleanliness – especially with reactive systems.
- Material and Pneumatic Checks: Adhere to temperature/pressure limits (max. 100 °C material, max. 250 bar, max. 8 bar air) and align with material data sheet.
- Test Application: Evaluate spray pattern, mixing behavior, and output on a test surface. In case of deviations, check mixing chamber/nozzle/screen first.
- Coating: Even tracks, constant movement. For large surfaces, ensure fatigue-free handling (connections/handle position).
- Post-Processing & Securing: Depressurize/secure gun according to system process, clean/change mixing chamber if necessary. Optional: Use flush/purge setup.
Troubleshooting (4 Typical Problems + Actions)
- Check nozzle (round/flat) and mixing chamber for fit/wear, replace if necessary.
- Clean/replace screen/filter (e.g., 60 mesh) to avoid particles/narrowing.
- Change mixing chamber: The output can be adjusted according to the concept by replacing the mixing chamber.
- Check process window (within limit values) and align with material data sheet.
- Reposition connections/hose routing (variable arrangement is provided) – reduce pulling forces.
- Choose appropriate handle/adapter configuration (manual handle vs. automatic adapter).
- Clean or replace the mixing chamber and pressing/nozzle parts promptly (option: rinsing/flushing device).
- Check screen/filter condition, use protective cover, and ensure clean handling.
Maintenance (5 Quick Points)
- Maintain Mixing Chamber: Clean regularly/replace if necessary (setup is designed to be exchangeable).
- Check Filter/Screen: Keep material screen (e.g., 60 mesh in standard setup) clean.
- Note Lubrication Points: Use the supplied grease gun/greased parts according to operating practice.
- Protection & Transport: Use protective cover and store in a robust case (included in delivery).
- Optional Flushing: Plan for a rinsing/flushing solution as an accessory for frequent material changes/stops.
FAQ (Practical)
Conclusion
If you want clean results with PUR/Polyurea, optimization with the WIWA PU GUN 4040 almost always starts with the right setup of mixing chamber, nozzle (round/flat), and a clean screen – and only then with process parameters within the limit values. Choose the manual gun for maximum flexibility or the automatic gun for reproducible series processes – both variants are available directly from Beschicht.com.
