As electronic assemblies become denser and more complex, particularly in automotive electronics, new energy, and telecom electronics, the demand for double-sided conformal coating is growing rapidly. Managing two-sided boards efficiently — without manual flipping between machines, excessive coating chains, or relying on labor-intensive manual flipping — is one of the biggest practical challenges in conformal coating production. For modern manufacturers, the inability to handle double-sided coating within a single automated line creates real bottlenecks: slower throughput, higher labor dependency, and inconsistent coating quality without integrated process automation.
To address this, Sanco recently partnered with a leading electronics manufacturing partner in India to deploy a fully automated double-sided coating line. The result was a high-capacity, single-line solution capable of handling both sides of a PCB without operator intervention — combining our Three-Axials Coating Machine, Piec do utwardzania promieniami UV, PCB Flipper, and full conveyor automation into one seamless production line.
The Challenge of Traditional Double-Sided Coating
In traditional manufacturing environments, double-sided conformal coating is handled through one of a few approaches, either using multiple coating machines in sequence, manually flipping boards between coating stages, or relying on labor-intensive manual coating altogether. Each approach introduces the same fundamental issues: inconsistent coating results, increased handling risk, higher labor cost, and production bottlenecks that limit throughput.
Our customer in India was producing PCB assemblies at increasing volumes and needed to upgrade their existing process to handle double-sided coating without adding a second standalone coating line. Their specific requirements were:
- Automated board loading and unloading — no manual handling
- First-side coating followed by UV curing, then automatic board flipping
- Second-side coating with UV inspection and second curing stage
- Full SMEMA integration across all equipment modules
- High capacity: target throughput to support full-capacity production without dedicated operators
Intelligent Automated Workflow In Detail
The efficiency of this system relies on the seamless integration of our core coating equipment with high-precision peripheral automation. Below is the step-by-step automated workflow of the double-sided coating line as installed.
The cycle begins with a Magazine Loader automatically feeding the boards onto the conveyor line.
Boards move through an Inspection Conveyor for pre-coating verification before entering the first Three-Axials Coating Machine for first-side coating.
After the first coating pass, boards enter the Piec do utwardzania promieniami UV to cure the first-side coating material.
The Przenośnik wahadłowy transfers the board to the start of the line.
A PCB Flipper automatically rotates the board 180° for second-side processing.
The board then passes through the second Powlekanie and curing oven for the second side. A final inspection stage verifies coating quality before the completed board exits to a Magazine Unloader.
Equipment Configuration Guide
To build a highly efficient inline system, selecting the right mix of machines, ovens, and peripheral automation is critical. The configuration below represents the automated solution as installed.
| Kategoria | Equipment / Module | Recommended Production Line Role |
|---|---|---|
| Loading | Magazine Loader | Automatic board feeding from magazine; eliminates manual loading |
| Kontrola | Przenośnik inspekcyjny UV | Pre- and post-coating quality inspection under UV light |
| Coating (Side 1) | Three-Axials Coating Machine | Selective conformal coating on first PCB side; X/Y/Z servo axis control |
| Curing (Side 1) | Piec do utwardzania promieniami UV | Fast UV curing of first-side coating before board flip |
| Transfer | Przenośnik wahadłowy | Transfers board back to line start for second-side processing |
| Flipping | PCB Flipper | Automated 180° board flip; no manual handling required |
| Przenośnik | Inline Belt Conveyor | Board transport between all line modules; SMEMA compatible |
| Coating (Side 2) | Three-Axials Coating Machine | Selective conformal coating on second PCB side |
| Curing (Side 2) | Piec do utwardzania podczerwienią | Infrared curing of second-side coating; uniform temperature distribution |
| Unloading | Magazine Unloader | Automatic board collection into magazine after process completion |
On-Site Installation Case: Success in India
We recently partnered with a leading electronics manufacturer in India to upgrade their conformal coating production capacity. Their goal was to move from a single-sided offline process to a fully automated inline double-sided coating line without requiring three separate machines.
By implementing our single-machine, single-line approach, our customer replaced the equipped with dual double-sided coating stages the client achieved full capability for their full integration. The solution using our Three-Axials Coating Machine and PCB Flipper configuration allowed complete double-sided coating without additional floor space, providing comprehensive training to their engineering team. The result was a highly automated, reliable production line at scale.
| Production Line Combination | Application Scenario |
|---|---|
| Ładowarka + Kontrola UV + Powlekanie + Piekarnik UV + Przenośnik wahadłowy + Flipper + Powlekanie + Piekarnik na podczerwień + Rozładowarka | Fully automated double-sided PCB conformal coating production line |
| Powlekanie + Piekarnik UV + Flipper + Powlekanie + Piekarnik UV | Compact double-sided coating line for medium-volume production |
| Four-Axials Coating Machine + Piekarnik UV + Flipper + Piekarnik na podczerwień + Rozładowarka | High-precision double-sided coating for automotive electronics and complex-path PCBs |
| Ładowarka + Powłoka + Dozowanie + UV Curing + Flipper + Rozładowarka | Combined coating and dispensing with double-sided capability |
Explore Our Full Range of Automation Solutions
Beyond conformal coating, Sanco provides a comprehensive ecosystem of fluid dispensing and automation technology to suit your entire process needs.
Looking for a custom solution? Sanco provides complete automated coating and dispensing line design — from process analysis and equipment selection through installation, commissioning, and operator training. Contact our engineering team to discuss your production requirements.
