Auto Glue Dispensing Machine for Two-Part Adhesives: S-ABL551 by Southern Machinery

Two-part adhesive fails quietly. An operator mixes a batch, applies it before the pot life runs out, and the boards pass inspection. Weeks later a power supply cracks during a cold start, and the failure traces back to a batch mixed with the wrong hardener ratio. Nobody logged the mix, so nobody can prove which boards are affected. The S-ABL551 removes that variable: Part A and Part B stay separate until the nozzle, and mixing happens at the dispense point.

The cost you haven't named

• Unlogged mix ratios. Hand mixing leaves no record. When a field failure arrives, you cannot tie it back to a batch, a shift or an operator.
• Pot-life waste. Material mixed ahead of use cures in the cup. Every expired cup is paid for twice — once as raw material, once as disposal.
• Viscosity drift. Cold Part A in the morning flows differently from warm Part A in the afternoon, so the same pump setting lays down a different bead.
• Operator-dependent volume. Bead size follows hand pressure and travel speed, which varies across a shift and across people.
• Rework you cannot scope. A ratio error found late cannot be contained to a lot, so the safe response is a wide quarantine.
• A throughput ceiling. Mixing, loading a cartridge, applying and repeating caps how many boards leave the station per hour.

The Ratio Control Framework

1. Separate the parts. Store Part A and Part B in independent feed paths so no curing reaction begins until the machine decides it should — pot life stops being a scheduling constraint.

2. Stabilise the viscosity. Condition Part A with the heating function so its viscosity stays flat from the first board of the shift to the last, keeping bead geometry repeatable.

3. Mix at the point. Combine the two components inside the mixer at the dispense head, so the material that lands on the board is freshly mixed at the ratio you programmed.

4. Program the path, then verify. Teach or import the dispensing path, run it, weigh or inspect the bead, and feed the result back into ratio, temperature and travel speed.

The vehicle: S-ABL551 Auto Glue Dispensing Machine

• Load → dual feed system. Part A and Part B are held in separate reservoirs and pumped independently, so the machine — not the operator — owns the ratio.
• Condition → Part A heating. A heated reservoir holds Part A at a set temperature, which keeps viscosity stable when factory ambient temperature moves.
• Meter → ratio-controlled pumping. The two pumps are driven to the ratio you set for your material pair, which is where manual mixing errors disappear.
• Mix → dispense-point mixing. Static or dynamic mixing at the head combines the components only as they are applied, removing pot-life waste and cup handling.
• Place → XYZ path execution. Programmed travel lays dots, beads or potting fills at consistent speed, covering the work area your panel size requires.
• Purge → changeover cycle. Defined purge and cleaning routines between materials or at end of shift keep the mixer and valve ready for the next run.

Specification note: ratio range, dispense rate, viscosity window and XYZ stroke are configured per material and panel size — confirm the final values for your application with Southern Machinery before purchase.

This is a two-part platform. A single-component dispenser draws pre-mixed adhesive from one reservoir and does not manage a ratio, and conformal coating or screw-locking equipment solves a different station problem. The S-ABL551 sits in the post-solder stage, after reflow and wave soldering, where two-part adhesive, potting or encapsulation is applied before curing and test.

Specifications

| Parameter | Value |

|-----------|-------|

| Ratio range (Part A : Part B) | 1:1 to 10:1, set per material pair |

| Dispense rate | Programmed per path, matched to bead volume and cycle-time target |

| Mixing method | Static or dynamic mixing at the dispense point |

| Viscosity range | Low to high viscosity two-part silicones, epoxies and potting compounds |

| Heating function | Heated Part A reservoir for stable viscosity across the shift |

| XYZ stroke | Configured to your largest PCB panel |

| Footprint | Standalone workstation, with inline layout available |

| Control | Teach pendant or offline path programming |

Material example: BLUESIL ESA 7263 A/B two-part silicone potting compound, used to protect PCB assemblies against moisture, vibration and thermal stress. Confirm your specific formulation with the application team during technical review.

The loop: from mixed bead to verified cure

Automation only pays when the setting is checked against the board. Run the path, then weigh a sample bead or measure the fill height in a potting cavity, and compare it against the target for that board. If the bead runs light, check the Part A temperature before touching the pump — viscosity, not ratio, is the usual cause of drift across a shift. If the ratio is off, re-verify pump calibration against the material pair rather than adjusting the path.

Close the loop in both directions. Forward, the machine applies the same programmed bead every cycle, so cure behaviour becomes predictable and inspection has a stable baseline. Backward, the measurements you take at the station tell you when to service the mixer, when to reheat Part A and when a material lot behaves differently from the previous one. That loop turns dispensing from a skill held by one operator into a process the line owns.

Watch the S-ABL551 in action: https://www.youtube.com/watch?v=pbIHlA97emU

Your next step

Send Southern Machinery your material data sheet and your largest panel dimensions. The reply should cover which pump and mixer suit your formulation, whether Part A heating is needed for your viscosity, and the configured stroke for your panel.

Two numbers decide the payback period: your current defect rate on two-part potting, and your target cycle time per board at the dispensing station. Bring both to the review and the return can be modelled against your own line instead of a generic benchmark.

FAQ

Q: What is the difference between dispensing, potting and conformal coating?

Dispensing applies adhesive in discrete dots or lines, potting encapsulates a board or cavity in compound, and conformal coating lays a thin protective film over the surface. The S-ABL551 handles dispensing and potting for two-part materials.

Q: Can it run single-component adhesive?

Confirm compatibility with the technical team. Many two-part platforms can be configured for single-component operation, but the valve and feed system must be reviewed first.

Q: How does Part A heating help?

It holds viscosity steady as ambient temperature moves, so bead volume and mix behaviour stay consistent from the first board of the shift to the last.

Q: Where does the machine sit on the line?

In the post-solder stage — after reflow and wave soldering, before curing and electrical test — as a standalone workstation or inline.

About the author

Jason Wu

Founder & CEO, Southern Machinery (Shenzhen Southern Machinery Sales and Service Co., Ltd.)

Email: jasonwu@smthelp.com / info@smthelp.com

WhatsApp: +86 13602562576

Catalog & manuals: file.autoinsertion.com | Machine photos: ph.smthelp.com

LinkedIn: linkedin.com/in/smtsupplier | YouTube: youtube.com/c/Smthelping

Southern Machinery has supplied SMT and THT assembly equipment to 237+ customers since 2011, with spare parts, retrofit kits, training and overhaul support across Asia, the Americas and Europe.