Precision Oil Application System

In response to a multi-industry need, Winkle Engineering has designed a system which accurately oils or coats a moving metal strip:  the patented "Precision Oil Application System".


While oil is most commonly applied, other liquid coatings may also benefit from the use of this system.  It alone addresses every one of the specifications listed below:


  • Precise and Even Oiling
  • Variable Application Rates
  • The need to accommodate varying strip widths
  • The need to change oil or coating product for various customer specifications
  • No excess oil on the product which may result in problems on the mandrel and uneven sides during winding
  • No excess oil resulting in oily environment and contamination of air

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How the Precision Oiler Works

A multi-segmented pump driven by a single shaft supplies oil evenly across the strip (even down to minute oil flow amounts) precisely and without plugging.  There are no valve seats or check valves to wear or malfunction and basic flow paths are large.  To vary the application rate, simply vary the speed of the pump shaft.  This can be done by a variable speed motor drive or by a driven roll mounted to the device driving the pump through appropriate gearing.  The variable speed motor drive can receive a signal from the line speed tachometer or other device to vary the application rate based on line speed.  The pressure on the pads can be varied to further control oil application.


To adjust strip width, valves (solenoid or pneumatically controlled) are internally ported to divert oil, not needed for coverage of narrower strip, back to the inlet side of the pump.  Accurate width control is achieved with no exposure of oil to the atmosphere nor loss of oil.


The oil or coating solution is delivered to special wear-resistant applicator pads with apply oil to the strip.  The applicator pads which are spring loaded will conform to the shape of the strip so even rippled steel is uniformly coated.  Winkle Roll Force Assemblies are used to position the Precision Oiler.  There are no rotating applicators to sling oil and no excess oil discharged into the environment.  All oil is coated onto the strip.


Maintenance is simple.  All wearing parts in the oil delivery system are easily and economically replaced.  The pad holders are reusable and only the pad material is discarded.  Should rough edges damage a series of pads, only those pads damaged need be replaced.  This is done at a fraction of the cost of replacing or resurfacing rolls.


High and low surface speed applications are handled equally well.  The delivery-system pump RPM is slow (under 60 RPM), even at high strip speeds.  The surface of applicator pads in contact with the strip is much greater than offered by any roll application method.  The air build up in the boundary layer is broken since air can move through the space between applicator pads (like tread grooves on a tire) to avoid hydroplaning.  The result...excellent coverage at high speeds.

The Precision Oil Application System (patented)

The complexity of this problem may be underestimated.  Please note the problems listed and proposed solutions which follow.

The problems include:

  • Excessive oil on the product, causing problems on the mandrel and uneven sides during winding


  • Excess oil draining from the coil during storage and contaminating the storage area


  • Excess oil to remove before additional in-house operations, later by secondary product handlers or at the final customers' locations


  • Excess oil at the point of application results in an oily environment and general housekeeping problems


  • Excess oil becomes air entrained during application and contaminates air inhaled by personnel in the area


Add to these problems, the need to change strip width or the need to change oil or coating product for various customer specifications and the equipment provider starts to understand the complexity.  Note, I said equipment providers, you, the operators, live with the problems and complexities daily.

Some attempted solutions include:

  • Oil sprays through nozzles.  It is this approach that contributes directly to the problems listed.


  • Oil sprays in front of a spreader roll.  This gives a more even coating, but generates a mist of oil because of centrifugal force, slinging excess oil into the air.


  • Utilizing one roll to coat an applicator roll.  Similar problem to spreader roll applicator, some reduction in excess oil use.


  • Internally fed porous roll has the problem of slinging oil unless enhanced with internal or external exhaust or vacuum system.  Difficult to control precise and even oiling.


  • Electrostatic oiling.  Theoretically one of the best solutions; however, there are problems with high initial cost, complexity of maintenance, problems with oils not taking charge, problems with foreign matter fouling internal passages and dirt being attracted from the atmosphere to the device and oiled surface.