Soft Rain King

Technologies available on Soft Rain King system:

The Master of Our range of Systems.

Extreme interoperability and in-depth supervision on the entire pre-treatment and painting line. All the phases concerning the washing process will be involved in the control of Soft Rain King. The main skill of the system is to guarantee and maintain high characteristics of all stages of the pre-treatment to offer high end performance in terms of mechanical adhesion and resistance to corrosion of the metal products treated.

This technological solution is the most suitable for those who want to equip their pre-treatment tunnel and also the rest of the painting line by optimizing the available space with the maximum treatment expression in terms of performance of the manufactured products and reliability for the entire production process.

The Soft Rain King system is equipped as standard with a specific water pre-treatment, a reverse osmosis system, dosing stations for the entire process, level management and transfer of the aqueous solutions in the tank, nebulization with variable flow rate of the solution osmotic and nanotechnological atomization directly on the products to be treated, with its own system for recovering the overspray of the applied solutions. Reading of the artifacts by means of photoelectric barriers at the entrance to the pre-treatment tunnel to optimize water and product consumption, suction and ventilation system to improve the effectiveness of the nebulizations.

Insights into the technologies present as standard in the Soft Rain King system:

Considering the dusty environments in which the equipment is installed, the central unit was conceived and designed to contain all the components inside and keep them intact.

The central unit was designed by dividing the system into different operating areas and each one groups together the components inherent to the technology applied in it.

Electric area:
Touchscreen, simple and intuitive operator panel, in colors of 10 “, 15.6” and 17 “.

Switch emergency mushroom pushbutton for immediate stop of all activities controlled by the system.

Electrical panel with PLC, low voltage power supply and all control and management interfaces.
Electrochemical Analyzers.

Hydraulic and pneumatic areas:
Hydraulic circuit equipped with: high pressure hydraulic pumps, manual and electrically motorized valves, different types of filters, pressure regulators, flow sensors, probes, etc …

Osmotic water storage tank.

The pneumatic system is equipped with a filtering unit for the machine inlet air and uses a series of solenoid valves to drive pneumatic actuators.

All device materials are compatible with the solutions, such as PVC, PP, PVDF, PTFE, 304 and 316 stainless steel

Two photoelectric barriers positioned at the entrance to the pre-treatment tunnel interfaced to optimize nebulization and atomization. With an encoder installed on the chain drive unit, the incoming products will be checked.

They monitor the entry of metal products and sends signals to the central PLC which processes them by activating and deactivating the nebulization with osmotic solution and the atomization of the nanotechnological solution only when necessary.

Pre-treatment of the water, using mineral coals and with a mechanical pre-filtration, essential to use our reverse osmosis system considering mains water coming from the water supply.

Our pre-treatment is analyzed, studied and designed according to the type and mineral characteristics of the water to be used to power any Soft Rain system or device.

We are able to provide incoming water treatments with column filtration of different types. Special skids (stainless steel structures) are created for these devices, and the systems are also equipped with automatic control units for backwashing the minerals or resins used.

Reverse osmosis has been designed and built specifically for use on painting lines with high performance and high reliability.

The efficiency is 70%, it produces 1000 l / h of permeate (osmotic water) and produces a concentrate (waste) equal to 400 l / h. This ratio remains unchanged regardless of the external operating temperatures because an elaborate software combined with a specific hardware manage all the phases appropriately to obtain this result. The premixing of the antiscalant product the system is supplied with guarantees long life for the osmotic membranes because it is dosed at regular intervals at a very low concentration.

The system also includes a storage tank with an elaborate recirculation system that passes through a UV-C lamp device with the aim of constantly limiting bacterial loads.

Osmotic water produced will change into osmotic solution because the alkalizing solution is injected in it.

It performs the accurate function of drastically reducing the saline residue through a hydraulic nebulization with pure osmotic solution – free of pollutants due to the process – directly on the items in transit at the end of the various rinses. Nebulization takes place inside the pre-treatment tunnel and is created with special hydraulic nozzles with suitably sized jets of different types and flow rates.

The osmotic solution is formed by pure osmotic water to which an alkalizing product is automatically added which is also an antioxidant and also temporarily avoids self-drying, it will be dosed in a few ppm per cubic meter and this ensures the reduction of any phenomena of flash rust on the artifacts.

This procedure mainly rewards the mechanical adhesion of the thermo-hardening film. Its operation is characterized by a particular hardware and software system that takes into account the water requirement.

The atomization of the nanotechnology solution has been developed and patented by Soft Rain. The characteristics of the nanotechnological solution and of the particular atomization nozzles can be suitably customized for each specific installation with the aim of guaranteeing the highest quality standards on metal surfaces treated.

Nanotechnological solution always compliant with the technical data sheet of the product used. The solution applied to metal products is not subject to pollutants, as it is prepared by means of a special dedicated system as if it were prepared in a laboratory. The artifacts will always be invested by the same nanotechnological solution. Very low consumption of the nanotechnological product. Absence of defects due to a non-compliant solution. The system does not produce wastewater to be treated, the excess nebulization is recovered and used in the pretreatment tunnel process. Atomization can be applied to all products that do not require a final rinse.


If the reading of the artefacts entering the pre-treatment tunnel is associated with this application, it will be possible to accurately control the nanotechnological solution feeding.


Regardless of the system chosen, Soft Rain considers the recovery and then the reuse of the nanotechnological solution by reintroducing it into the tunnel pre-treatment process.

The overspray of the excess nanotechnological solution is conveyed into a tank intended for recovery, positioned under the application module of the tunnel.

The nanotechnological solution collected inside the tank is relaunched by a pump dedicated to a tank of the pre-treatment tunnel. This operation allows to maximize the consumption of the aqueous solutions, allocating them to one of the stages of the pre-treatment process where it is allowed to use them, mixing them with the solution already present in the tank.

Depending on the type of tunnel, in order to correctly apply nanotechnologies, it is possible to take advantage of:
– complete application module
– forced air intake with external expulsion
– containment air blade

Metal Plast Sistemi is able to design and build custom-made stainless steel tunnel sections in order to allow the correct use of nanotechnological products. The tunnel is usually equipped with an adjustable suction by means of special throttling dampers and a forced air knife ventilation which have the purpose of confining the nanotechnological nebulization area and preventing the propagation inside the tunnel and outside.

Suction and ventilation are coordinated by the central unit if it is inserted in one of our systems.

The steel structure is self-supporting and can be made of AISI 304 and 316 stainless steel.

This technology has the purpose of breaking down and minimizing the effects caused by the entrainment of aqueous solutions deriving from the advancement of the metal products in the pre-treatment tunnel.


A hydraulic circuit for transferring the aqueous solutions present in the various tanks is created using special instrumentation and dedicated components, installed directly on the pre-treatment tunnel while the system hardware is part of the central unit.


The use of this technology becomes essential if the plant is equipped with a reverse osmosis system.

This system can be directly interfaced with our Soft Emergency device, if it is installed in a dedicated device.

Soft Rain dosing stations can be used on all types of chemicals used in pre-treatment lines because they offer high chemical compatibility. The stations are completely automated and can be controlled with different methods, such as µS, pH, redox, etc.

They can be composed of one or more dosing pumps. They are equipped with the following components:

– specific electrochemical analyzers

– probes, specific electrodes for use

– dosing pumps with high chemical compatibility and with different types of flow rates in l / h, depending on the use

– suction lances for chemical product, injection valves

– transport system of the aqueous solution to be analyzed

– automatic cleaning system of the entire hydraulic circuit and therefore of the various sensors or electrodes


Depending on the type of equipment chosen, they can be installed inside the central unit (for systems) or they can be purchased as a single supply for specific use (devices).

Application that controls minute by minute all the main parameters relating to the painting line, i.e. the pre-treatment tunnel, the chain drive, the polymerization oven and the drying oven.

This technology allows you to set any process alarms on the HMI operator panel and offers the possibility of recording and archiving the monitored parameters. All the necessary sensors will be installed on board the system, which interfacing with the central PLC will allow to extrapolate the required data.

The whole painting line is graphically shown on the operator panel with all the parameters obtained from the system. In a simple and intuitive way it will be possible to have a snapshot of the process conditions.

This technology is provided in any system where the use of the monitoring of the parameters relating to the pre-treatment tunnel with the aim of maintaining the functionality unchanged over time.

This particular technology that equips our systems has a high importance because it ensures correct extrapolation of the data obtained from the probes and electrodes, keeping them constantly clean and thus avoiding the use of human resources for maintenance.


A software system combined with dedicated hardware make it possible to obtain the technology described above.

Each system that we can supply, in its standard configuration, provides the use of industrial PLCs interface connected to an operator panel that is able to support the ethernet connection.

The advantages of using remote control are many and guarantee the customer an online control service on all connected Soft Rain equipment. Access takes place using a dedicated platform where it is possible to configure different terminals or devices (smartphone, PC, tablet, etc.) and also offers the possibility of interacting, based on the type of login, with the equipment.

All this with the help of the latest generation industrial automation, an HMI touchscreen operator interface that can be remotable if connected to the network via Ethernet cable, thus also allowing you to take advantage of remote assistance for diagnostics by our highly skilled technicians.

©2024 Metal Plast Sistemi s.r.l