Nordson SEALANT EQUIPMENT

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Common Application Challenges In Material Dispensing

Our extensive experience of metering, mixing and dispensing 1 and 2 component materials enables a range of solutions for our customers.

Wide Ratio Materials

Definition: We define a wide ratio as any mixing ratio at 4:1 or greater (by volume).

Challenge: Meter, mix, dispense equipment is commonly developed for 1:1 materials.

Nordson Solutions:

  • Custom Ratios – Nordson designs cylinders and metering rods that fit the volumetric ratio exactly, as well as providing appropriate sized orifices on fluid inlet and outlet valves.
  • Specific Meters - Our Pro-Meter D2K utilizes two independently controlled servo motors, which allow for the pre-pressuring of each material to its own desired pressure for the best mix.
  • Valve Selection – Our 3-port valves developed for both thick (250 Series) and thin (545 Series) materials, provide two orifices for the high volume side, and a singular orifice for the low volume side, allowing the high volume to flow efficiently.

Dissimilar Viscosities

Definition: When one material is considerably thicker than another. In most cases, the base (or high volume) side of the material is a paste; whereas the catalyst (or low volume) side of the material is a flowable, solvent like material.

Challenge #1: Thick and Thin materials flow differently with the same amount of pressure, resulting in one material leading the other, a phenomenon known as “Lead Lag”. This can result in an unmixed section of a bead.

Nordson Solution:

  • Lead Lag Adjustments – Hardware options for our Pro-Meter Series allow for lead/lag corrections.
  • Pre-Pressure Capability - The Nordson Pro-Meter D2K utilizes two independently controlled servo motors, which allow for the pre-pressuring of each material to its individual desired pressure for the best mix.

Challenge #2: Thick materials force their way into the thin material’s discharge port, resulting in a cured shut valve.

Nordson Solution:

  • Check Valve at point of dispense – Our 3 Port style valves for both thick (250 Series) and thin (545 Series) materials, provide a check valve for the thin material, preventing any material backflow into the valve body.

 

Filled Materials

Definition: Materials commonly contain fillers made of different compounds. Some are used to give the material specific properties (thermal traits, electrical conduction), while others are incorporated in order to change the thickness of the material.

Challenge #1: Fillers can be heavier than the liquid they are in, and fall out of suspension.

Nordson Solution:

  • Material Agitation – Nordson supplies material pressure tanks that can have material agitators added to keep the material moving and the fillers in suspension.
  • Material Recirculation – circulating the material from the dispense valve back to the supply tanks allows for the fillers contained in the meter and hoses to be kept in suspension.

Challenge #2: Fillers can gather, or pack out, in locations and alter pressures over time.

Nordson Solution:

  • With a flushable design and minimal use of 90 degree turns, Nordson meters and supply equipment allow for less material to pack out in corners and metering cylinders.


Abrasive Materials

Definition: Materials commonly contain fillers made of different compounds. While most of these fillers are docile, some have properties that are rough, or abrasive.

Challenge #1: Abrasive materials wear away at fluid seals and o-rings, causing premature leaks.

Nordson Solution:

  • Seal Selection – Nordson Sealant Equipment offers over a dozen seal and o-ring compounds to be compatible with the material, some compounds are chosen specifically for their resistance to abrasion, and ability to rebound when being worn.
  • Seal Cartridges – Quick change seal cartridges are used to quickly change out seals and o-rings without line down situations.

Challenge #2: Abrasive materials wear away at hard components in the fluid path, resulting in pressure changes and leaks, which can disrupt volume and ratio accuracy.

Nordson Solution:

  • Fluid Path Design – Fluid paths in our meters and valves are designed for the most efficient and easiest path of fluid flow.
  • Special Coatings – Nordson's patented “Sure Guard” coating provides abrasion resistance for rods, cylinders, and valve components.