By Sophie Lindqvist

Coherix, a machine vision specialist, is promoting a system that inspects and adjusts adhesive application in real time on automotive assembly lines. The company presented its approach as an advance over inspection methods that detect defects only after the glue bead (the line of adhesive dispensed on a part) has already been applied.

The claim matters because adhesive use in car bodies keeps rising. Structural adhesives and sealants now join mixed-material assemblies where welding is impractical, so a dispense error that goes undetected can propagate through body-in-white (the welded sheet-metal stage of a car body before painting) and surface only at audit or, worse, in the field.

What does the system actually do?

According to the company's announcement, carried by Interplas Insights, the Coherix technology combines two functions that plants traditionally separate: inspection of the applied bead and closed-loop adjustment of the dispensing equipment. Most quality gates today check bead presence, width or volume after application, then flag misses for manual repair.

Real-time adjustment changes that sequence. The system measures the bead as it is laid down and signals the dispenser to correct parameters — position, volume or flow — on the next cycle rather than after a batch has been processed. Coherix positions this as a way to cut rework and material waste on high-volume lines.

The company has not published specific customer volumes, cycle-time figures or defect-rate reductions alongside the announcement. As with any supplier claim, the operational benefit needs verification against line-level production data before it can be treated as confirmed rather than stated intention.

Why adhesive control is a plant-level issue

Adhesive dispensing sits at a awkward point in the assembly process. The bead is applied in seconds, it is often invisible once parts are mated, and its failure mode — a gap or a thin section — does not show up in a visual audit of the finished joint. A vision system that measures the bead at the point of dispense addresses the defect at the only moment it is directly observable.

That logic parallels the earlier shift in weld quality monitoring, where checks moved from post-hoc teardown sampling to inline checks at each weld gun. Coherix is arguing the same transition is due for adhesive application.

What to watch next

Watch for named OEM or tier-one adopters and quantified results — scrap-rate reduction, rework minutes saved per shift, or uptime figures from a running line. A reference plant with published numbers would convert this from an announced capability into a confirmed capacity story. Also watch whether Coherix extends the same closed-loop approach to sealant and potting (filling cavities with resin for sealing) applications beyond body shops.