SME-350MB Inline Semi-Aqueous PCBA Cleaning Machine: Post-Solder Cleaning for Assembled Boards

Southern Machinery's SME-350MB is a conveyor-type, inline semi-aqueous cleaning machine designed for assembled PCBAs. It removes flux residue, dust, and light surface contamination after Wave Soldering or Reflow Oven processes — without taking boards out of the line. With a 350 mm cleaning width, adjustable transport speed, and an ROI-focused design, it is a practical middle ground between manual brush cleaning and large-scale aqueous washing systems.

What is this machine used for?

The SME-350MB is used to clean assembled PCBs (PCBA) after soldering. It carries boards through the machine on an inline conveyor, where brush and liquid cleaning stages remove flux residue, fine particles, dust, and light surface contamination left behind by Wave Soldering, THT insertion, or rework.

It answers a simple process question: "How do we clean boards consistently without a dedicated cleaning crew?" Manual brush cleaning is labor-intensive and hard to standardize. Large aqueous cleaners are effective but oversized for many EMS and ODM shops. The SME-350MB sits between the two: an inline conveyor machine with semi-aqueous chemistry, controlled liquid use, and a 350 mm width envelope that matches typical mixed SMT/THT production.

Typical contamination handled:

• Flux residue after Wave Soldering or reflow
• Fine particles and dust from handling and assembly
• Light oil or rework residue
• Surface contamination before conformal coating, inspection, or final test

Typical Application Scenarios

Scenario	Why SME-350MB fits
EMS / ODM mixed SMT+THT lines	Inline conveyor transport keeps boards flowing; semi-aqueous process suits post-Wave Soldering residue
Automotive electronics	Consistent cleaning quality for boards that will be coated or potted
Industrial control	Removes particles and flux residue that can affect long-term reliability
Consumer electronics PCBA	Standardizes cleaning without a large water-treatment footprint
Post-rework cleaning	One machine handles rework residue plus regular post-solder cleaning

Common board sizes: designed around boards from approximately 100 × 100 mm up to 220 × 200 mm — all within the machine's 350 mm width envelope.

How It Integrates into a Complete PCB Assembly Line

The SME-350MB is an inline conveyor machine, so it connects directly to the board handling flow. A typical mixed-technology line looks like this:

1. Solder paste printing and SMT Pick and Place
2. Reflow Oven
3. THT auto insertion (radial, axial, odd-form)
4. Wave Soldering (e.g., S-WS450 or S-WS350B lead-free dual wave)
5. Post-solder PCBA cleaning (SME-350MB)
6. AOI / SPI inspection
7. Functional test, conformal coating, or final assembly

The machine's conveyor height is adjustable (750 ± 50 mm), which helps it align with existing line heights and board handling equipment. Boards enter through the infeed section, pass through the cleaning process zones on chain-claw transport, and exit through the drying/outfeed section. An exhaust connection (approx. 6 m³/min, Ø115 mm outlet) ties into plant ventilation.

Before final process confirmation, Southern Machinery recommends validating settings with the customer's real PCBA samples — component height on both sides, liquid-sensitive parts, and cleaning chemistry compatibility must be checked against the actual board.

Key Selection Parameters (Buyer's Checklist)

Use this checklist when evaluating an inline semi-aqueous PCBA cleaning machine:

• Cleaning width vs. your largest board — SME-350MB: 350 mm max width × 100 mm max height, length unlimited
• Transport speed range — 0.1–1.5 m/min adjustable; typical operating range 0.4–1.0 m/min
• Brush configuration — roller brush Ø120 mm, disc brush Ø350 mm, spindle speed 0–500 rpm adjustable
• Conveyor height — 750 ± 50 mm adjustable, for line-height matching
• Exhaust interface — approx. 6 m³/min, outlet Ø115 mm; confirm plant ventilation capacity
• Power supply — AC220V / 50 Hz, total power 500 W (verify your facility's voltage/frequency)
• Footprint and weight — machine size 2100(L) × 1100(W) × 1100(H) mm, approx. 310 kg
• Chemistry — semi-aqueous; confirm compatibility with your PCB materials and components
• Component height — confirm maximum component height on top and bottom sides before quoting

These are the parameters Southern Machinery confirms with buyers before final configuration. Every line is different, so the exact process settings are validated with your actual boards.

ROI, Quality, and Throughput

The ROI case for the SME-350MB is straightforward: replace inconsistent manual cleaning with a repeatable inline process.

Reference throughput comparison (supplier reference figures):

Approach	Output
Manual brush cleaning	60–80 pcs/hour typical
SME-350MB example (150 × 200 mm board @ 1 m/min)	~390 pcs/hour
Reference output (size/speed dependent)	~600 pcs/hour

Where the payback comes from:

• Labor — one operator can supervise multiple units; manual cleaning often needs several operators to match output
• Consistency — inline chain transport and one-button operation reduce handling variation
• Less rework — fewer repeated cleanings and less handling damage
• Controlled chemistry use — integrated liquid return and filtration reduce cleaning liquid consumption versus uncontrolled manual use (reference consumption approx. 5 L/hour with concentration top-up as needed)

Use your local labor cost, shift hours, and monthly production volume to calculate payback: monthly savings ≈ labor hours saved + reduced re-cleaning/rework + more stable throughput − consumables and maintenance.

FAQ

Q: What is the SME-350MB PCBA cleaning machine used for? A: It cleans assembled PCBs (PCBA) after soldering — removing flux residue, dust, fine particles, and light surface contamination from boards processed through Wave Soldering, THT insertion, or reflow.

Q: Is the SME-350MB an inline cleaning machine? A: Yes. It is a conveyor-type inline machine with infeed/outfeed transport, cleaning zones, and drying — designed to connect directly into the PCB assembly line.

Q: What board sizes can the SME-350MB handle? A: It has a 350 mm maximum cleaning width and 100 mm height envelope, with unlimited board length. Boards from approximately 100 × 100 mm up to 220 × 200 mm fit comfortably.

Q: What cleaning chemistry does it use? A: It is a semi-aqueous cleaning machine. Chemistry compatibility with the actual PCBA materials and components must be confirmed before final process validation.

Q: How does it compare to manual cleaning? A: Manual brush cleaning typically achieves 60–80 pcs/hour; supplier reference figures show the SME-350MB reaching roughly 390 pcs/hour on a 150 × 200 mm board at 1 m/min, with higher reference output depending on board size and speed.

Q: What support does Southern Machinery provide? A: Southern Machinery, founded in 2011 in Shenzhen, China, serves 237+ global customers with SMT/THT PCB assembly automation. Support includes configuration advice, sample validation, spare parts, training, and service for the full line — SMT, THT, Wave Soldering, board handling, and inspection.

Contact Southern Machinery for Configuration Advice

Get an inline cleaning configuration matched to your board profile, residue type, and cleanliness targets. Contact Jason Wu at jasonwu@smthelp.com or +86 13602562576, or visit www.smthelp.com.

Browse product catalogs at file.autoinsertion.com and machine photos at ph.smthelp.com.

Southern Machinery (Shenzhen) designs and manufactures SMT/THT PCB assembly automation equipment — insertion machines, Wave Soldering, board handling, cleaning, and inspection — for high-efficiency, cost-effective production lines. Founded in 2011 and serving 237+ customers globally, the company provides full-line solutions, spare parts, and training.