Conidur© Fine Hole Screens

With perforated hole sizes from 20 micron CONIDUR© fine hole screens can provide great increases in milling filtration and separation throughput due to their specific hole shape particularly when compared against laser cut screens.

Conidur© fine hole screens

With perforated hole sizes from 20 micron CONIDUR© fine hole screens can provide large increases in milling filtration and separation throughput due to their specific hole shape particularly when compared against laser cut screens.

One of the most significant features of CONIDUR© fine hole screens contributing to increased product throughput in milling, filtration and separation applications, is the triangular to hemi-ellipsoidal specific hole shape, which differs from cylindrical round holes due to its conical shape. This feature allows product to exit the aperture faster due to the limited resistance and thus reduce product binding.

In fact CONIDUR© fine hole screens used in a comparison tests in the USA on a hammer mill screen application produced a 70% greater product throughput when compared against laser cut screens.

In addition to increased product throughput CONIDUR© fine hole screens can also extend screen life due to the option of screen material thickness being up to 6 times greater than the conical hole diameter, which can be as small as 20 micron (0.02mm).

This is achieved by a special manufacturing process, which also increases the strength and wear resistant capability to provide long life screens.

Greater open areas are available when using CONIDUR© slotted hole screens as often required in a centrifuge screen.

Typical applications involve flour milling screens, filter leaves and plates, centrifuge screens, all of which can be supplied in a wide variety of materials, including – carbon and stainless steel, Titanium, Hastelloy, Inconel etc.

Conidur fine hole screens

Conidur© Fine Hole Screens

Conidur© Slotted Hole Plate

The ability to produce screen cylinders down to 50mm and in some cases to 20mm and combined with wedge wire provides a suitable filter medium for oil extraction, paint and chocolate manufacturing as well as use in the pharmaceutical industry.

Kentech Conidur Slotted Hole Plate

Conidur® Fine Hole Sheets

Chemical Industry

  • As a filter element in plates and pipes.
  • As a centrifugal screen.
  • As a screening element in mills.
  • As a gas-distribution deck for fluidised bed units.

Food Industry

  • As a dewatering and working screen for sugar and starch centrifugals.
  • As a screen panel in mills.
  • As a separating element in fruit juice manufacture.
  • For press moulds in the cheese industry.
  • As a gas-distribution deck for fluidised bed units.

Pharmaceutical Industry

  • For coating systems.
  • For pneumatic transport desks.

General Processing

  • For milling of plastics.
  • For milling of grain dish.
  • With processing of feeding stuff.
  • For drying/cooling of foundry sand.
  • As a fluidized bed for sand processing.

Further Applications

  • As a filtering surface.
  • As a screening surface.
  • As an ventilation element for silo and hopper bottoms.
  • As a distribution deck for pneumatic conveying channels.

Fluidised Bed Dryer Distribution Decks

Conidur© gas-distribution deck in a fluidized bed unit

Distribution decks using CONIDUR© – hole plates have a distinct advantage due to their unique Jet-shaped conical hole, which enable a sharp air flow of intense heat, but allow openings to remain clear
One most important reason for an increasing number of bulk materials being thermally treated in fluidised bed units, is the resulting high economic efficiency achieved from the intensive heat and material exchange between solid material and fluid medium.

This is largely due to type of gas distribution plate or distribution deck, which is an essential component of any fluidised bed dryer installation.
CONIDUR© screen hole sizes start at 50 micron
Many installations are proving very satisfactory when handling a variety of materials with different humidities, physical and chemical properties.
CONIDUR© gas distribution plates are precisely selected for a required pressure drop, to ensure the fluid medium is distributed evenly to the solid material, but also to prevent the material from falling through the plate or clogging in the event of zero gas pressure beneath the plate.
The even distribution of the fluid medium is achieved by using a minimum of pressure under the gas distribution plate, but also dependent on the product characteristics and the dumping height in the installation. Specific material selection and finish also play an important part in avoiding adhesion.

The following products have been handled in fluidised bed units so far:

Chemical Industry
• organic acids • paints • salts • fertilizers • insecticides • synthetics • detergent additives

Food Industry
• coffee • cocoa • tea • sugar • milk powder • cereals
• vegetables • baby food • gelatine • instant foods

General Processing
• coal • quartz sand • mould sand

Another important factor of CONIDUR© gas distribution plates is the gas velocity over the distribution plate. This has to be smaller than the sinking speed of the smallest particles in the fluidised product bed, otherwise too much of the product will be carried along by the gas flow, requiring recovery in a filter or cyclone.

Some specific applications may require changes in airflow direction. This is easily achieved with selective positioning of CONIDUR© gas distribution plates to alter the direction of product flow as required.

Conidur deck

Silo Aeration Cones

Conidur© - Hole Sheet Cone made of multiple parts for fluidised bed applications

CONIDUR© -Gas Distributing Cones made from CONIDUR© – Hole Sheets are selected to ensure a uniform air flow to prevent agglomeration of product in silos. Each cone finish is adapted to the given volume of gas which is required for fluidisation.

CONIDUR© Fine Hole Sheets are creating new opportunities for bulk material flow in silos and air slide conveying.

Silos are gaining increasing importance in the processing and treatment of products, with the need for bulk materials not only to be stored, but dried and kept flowing, without the need for vibrators.

CONIDUR© -Gas Distributing Cones are available as complete items ready for installation on suitable supports in the base of silos or hoppers

Due to the arrangement of CONIDUR© -Gas Distributing Cones a uniform air flow to the product is ensured, so heat accumulation is prevented, resulting in a reduced drying time, higher efficiency and consequent savings in energy, whilst also improving product discharge.

One of the most important advantages in using CONIDUR© – H o l e Sheets is that the airflow is angled by the shape of the holes, and can thus be directed accordingly. This feature means the angle of the silo discharge cone can be made less acute or nearly horizontal depending on the product characteristics. The directed airflow also transports the product to the silo outlet thus improving product discharge.

This angled air flow feature when used as a distribution deck in an air slide means CONIDUR© is a serious alternative to other forms of material conveying.

Advantages of CONIDUR© Fine - Hole Sheets

  • simple installation in existing silo units
  • high load capacity with appropriate support
  • improving product discharge through optional airflow
  • adaptable to a given air volume
    finest hole perforation possible in relatively thick
  • conical hole form prevents clogging, self cleaning
  • electrolytical treatment of the plates provides passive
    surface preventing adhesion of product.