How to pair the adhesive and dispensing valve of a vision dispensing machine?

When choosing a vision dispensing machine, the valve body is often treated as an accessory that comes along with the manual, but when actually implemented, it is often ”poor dispensing, stringing, unstable metering” that goes wrong first. Remember one sentence first:valve body specified by adhesive type, this is the first gate of selection, ahead of agonizing over stroke and appearance.

I. First understand the glue's temperament

Adhesive is not one thing; its physical properties directly determine which type of valve to use. Ask yourself five questions:

First, viscosity range, from watery to paste-like, vastly different;

Second, whether it is two-component, A/B mixture has a pot life; miss it and it's wasted;

Third, whether heating is required, hot-melt adhesive is solid at room temperature and must be heated to melt before it flows and cures upon cooling;

Fourth, whether it is sensitive to micro and precision, micro-dots cannot tolerate large dispensing;

Fifth, whether non-contact is required, if the workpiece has height differences or is brittle/thin and afraid of pressure, the needle must not touch it.

If these five points are not clarified and the wrong valve is selected, no parameter adjustment afterward can save it.

II. Valve Bodies Classified by Application

The valve bodies configurable on Bolli's vision dispensing machine are roughly divided into several categories by use. Among conventional valves there areneedle valve, suck-back valve, silicone valve, for common general adhesives, contact dispensing is used, among which the suck-back valve can retract and recover adhesive, preventing stringing and tailing.pneumatic jetting valveDriven by air, large dispensing volume, thicker lines, non-contact type, can dispense workpieces with height differences of about 0.5–1cm, more cost-effective than piezoelectric.piezoelectric valveelectric-driven, small dispensing volume, precise and stable lines, likewise non-contact, suitable for micro-precision.Screw valvespecializes in viscous glue, requiring strict gram-weight metering.standard two-component valvefor two-component mixed dispensing.hot-melt-adhesive valvewith temperature control for hot-melt glue.fast-curing-adhesive valveis dedicated to fast-dry glue.spray valvefor atomized spraying.regulated-pressure valvestabilizes air pressure. This list basically covers common glue types.

III. How to implement the pairing principles

The rule is actually not complicated: low viscosity, large volume, contactable → needle valve or suck-back valve, silicone valve; height difference, brittle/thin parts, need non-contact → pneumatic jetting valve or piezoelectric valve; need micro-precision → piezoelectric valve; thick adhesive needs metering → screw valve; two-component → conventional two-component valve; hot-melt → hot-melt valve; fast-curing → fast-curing valve; need spraying → spray valve. If a workpiece has many adhesive types,Bolli supports multi-valve switching, changing valves by position rather than one machine forcing all adhesives.

IV. To what extent can Bolli configure

Bolli's vision dispensing machine selects and configures the valve body by adhesive type; the valve body belongs to the price list's“add valve” optional paid item. A reminder: beyond the confirmed dual-valve configuration, do not infer triple-valve or higher configurations, avoiding commitments outside the documentation. The most practical way to judge "whether the configuration is adequate" is to bring real adhesive to BolliFree Sampling，On-site, look at three things: whether dispensing is stable without clogging, whether there is stringing when retracting adhesive, and whether the same dispensing volume is consistent.

V. Implementation advice

Don't just look at whether the equipment "can dispense this adhesive," but at "whether it dispenses well, stably, and whether adhesive change is troublesome." It is recommended to first sort out the viscosity, components, and whether heating is needed for the adhesive on hand, then bring the adhesive for sample testing to determine the valve. For valve body selection or sample testing, welcome to contact Bolli for consultation13352947677。