Meter, Mix, Dispense Equipment

Call 978.463.0202

Providing Adhesive Dispensing Systems to a Wide Market

Providing Adhesive Dispensing Systems to a Wide Market

Providing Adhesive Dispensing Systems to a Wide Market

Providing Adhesive Dispensing Systems to a Wide Market

Providing Adhesive Dispensing Systems to a Wide Market

Providing Adhesive Dispensing Systems to a Wide Market

Providing Adhesive Dispensing Systems to a Wide Market

Potting Application with Automation

Potting thousands of small components with a 2-part silicone required an automated adhesive dispensing system integrated with a table-top robot.

The complexity of the dispensing required multiple passes at different flow rates then a final pass to level the adhesive.

The adhesive dispensing system used was a GP8O  gear metering system with vacuum degas capability in the reservoirs. The gear metering provided accurate ratio while the vacuum degas stripped air from the adhesive in the tanks.

When metering two adhesives at the design ratio it is important the two fluids react the same to the applied force. If compression occurs in the metering the ratio will not be accurate.

Programming of the robot is intuitive and done with a teach pendant. No actual code or dimensions are needed.

Almost any potting application can be automated with the wide range of tables available. Either gear metering or piston metering systems can be incorporated into a complete, automated dispensing system.

The versatility of the system permits the potting of different products.

 

Ashby Cross has manufactured adhesive dispensing equipment for over 35  years. We welcome your dispensing questions – post them in the comments, use our Contact page, or call us at 978-463-0202

Gear vs. Piston Metering – Adhesive Dispensing Equipment

Selecting adhesive dispensing equipment – Gear vs. Piston metering

Adhesive dispensing equipment is purchased for many reasons, but mostly, like with other capital expenditures, it’s purchased to, reduce waste, increase productivity, yield greater product reliability, eliminate workers exposure to chemicals, reduce adhesive costs in some instances, and generally result in greater profits.
Additionally, an increase in production can sometimes force companies into the purchase because the mix-by-hand method is no longer adequate to maintain production.

Our responsibility at Ashby Cross is to ensure the customer’s needs are met in designing an adhesive dispensing system that will meet their application.

There are a number of considerations in the design. The primary one is the adhesive that will be processed. This drives the type of metering we would select.

A short primer on metering systems

Gear and cylinder/piston are the two most widely used metering devices available when designing adhesive dispensing equipment.  Each is very precise and will accurately proportion the adhesive.
We would consider such things as viscosity, specific gravity, temperature, fillers, filler type, and ratio when deciding which type of metering to use.
The nature of gear pumps, very tight tolerances with rotating parts, does not lend itself to processing highly filled or abrasive fillers in the adhesive. In this instance we would opt for the cylinder/piston metering with abrasion resistant seals.

In either case, the basic system design makes use of two proportioning devices (gear pump or cylinder/piston). Gear pumps are defined by their specific output per revolution, for instance, 3 cc per revolution. Using an example of a 2:1 by volume ratio material we would combine a 3cc/rev. with a 6cc/rev. pump and rotate them at the same speed. The output would be 2:1 by volume.
We can also vary the relative speed of the gear pumps to achieve the desired ratio. For instance combine two 3cc/rev. pumps and rotate one half as fast as the other.

Ratios of 100:100 through 100:7 by volume (continuously through the range) can be achieved by combining different pump sizes and relative speeds.

Gear Pump

Gear Pump

The benefits of a gear metering system include.

  •   Few moving parts
  •   Variable flow rates
  •   Self bleeding.
  •   Adjustable ratio

Cylinder/piston systems offer a broader application range as they can be used in heavily filled, abrasive applications as well as unfilled applications. Viscosity can range from thin to a million or more cps.

Ratio, in the fixed ratio machines, is achieved through the relative volumes of the two cylinders.
For the same 2:1 ratio adhesive example we used above the resin cylinder would have a volume twice that of the catalyst cylinder. The typical Ashby Cross system is pneumatically and hydraulically driven. The hydraulic drive is provided by the adhesive which enters the machine at elevated pressure.

The pneumatic drive is an air cylinder that works in conjunction with the hydraulic pressure.

Ashby Cross has manufactured adhesive dispensing equipment for over 35  years. We welcome your dispensing questions – post them in the comments, use our Contact page, or call us at 978-463-0202

Connector dispensing: Dispensing into connectors with harness

In this video, we show how to use a robot to dispense into connectors. The cabling with the connectors is deposited in a nest—the one shown holds four connectors at a time—and the nest is placed on the dispensing robot. A grease cartridge is set in a pressurized container. The grease flows down through hosing to a spool valve, which is precisely controlled by the robot to do the dispensing via the selected program. The robot moves into position and dispenses material into the connector.

With two nests, the robot can take care of one batch of connectors while the operator prepares the next batch. To load a nest, simply move the connector into place, slide down, and put it in.

Adhesive dispensing with gear meters

Watch this comprehensive tour of the GP-80 benchtop meter, mix system for dispensing pourable, 2-part materials. The GP-80 is comprised of a number of sections: feed tanks, metering section, power console with flow control, heat zones, and the dispense gun, which in this case is hand-held pistol grip with static mixer attached. The system shown has seven different heat zones. The GP-80 is used for unfilled epoxies and unfilled 2-part urethanes. Learn more in the video below.