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SCREENING

DiamondRoll® Fines Screens

Precision wood chip screening to the exact size needed

  • With Cover
  • No Cover
acrowood-diamondroll-fine-screen-feature
acrowood-diamondroll-fine-screen-no-covers-feature

Acrowood DiamondRoll® Fines Screens

The Fines Screens makes finite separations of smaller chip fractions. It typically removes more than 90% of fines from accepts and can retain or reject pin chips, as desired. Filtering chips to the correct size minimize the use of chemicals needed in the digester in the making of pulp.

DiamondRoll Fines Screen Features

The advantages of a DiamondRoll® screen include:

  • Highly efficient and selective fines removal
  • Low maintenance costs and downtime,
  • Excellent fiber recovery
  • Quick payback on good fiber recovery from waste streams.
  • Screening targets met and specific fines fractions segregated with various knurl patterns
  • Minimal fiber loss in non-blinding operation with special shaft design and tight gap settings
  • Low profile screen frame for simple installation
  • Obtain a higher yield of pulp from raw materials coming in, resulting in immediate savings

A proven concept in high-efficiency fines screening

Acrowood was the first in the world to bring roll screens to the industry. Today hundreds of DiamondRoll Fines Screens are in operation world-wide, helping mills retain valuable fiber while removing fines.

Fines Screens Applications

  • Chip Plants
  • OSB Plants
  • Pellet Plants
  • Pulp Mills
  • Sawmills
  • Shavings Mills
Roll screen close up view of the Acrowood DiamondRoll Screen

Success Is In The Rolls

Chips travel across a series of parallel, rotating rolls machined from solid alloy steel. As these diamond-patterned rolls rotate, fines migrate into the space between the diamond tips and are rejected through the Inter-Roll Openings (IRO).

Pins and chips larger than the opening are carried over the screen’s surface and off the end. Using solid, alloy steel shafts helps to maintain the straight and constant nip opening. High IRO accuracy is the key to the screen’s efficiency.

Fines-Screening-with-Rotary-and-Roll-Screens

Fines Screens Adaptability

Variable Inter-Roll Opening (VIRO) allows the spacing between the shafts to be set to meet the specific needs of the application, but then to be easily adjusted if material quality changes, or if process advantages develop for different openings.

Shaft spacing is adjusted by changing shims between bearing blocks in the side frame of the screen. Shims between the bearing blocks set the spacing between the rolls.

If a larger opening is needed, additional shims can be added. If the rolls need to come closer together, a thinner shim is used.

The IRO and the speed of the shafts can be independently controlled and work together to fine tune screen performance.

diamondroll-fine-screen-02
diamondroll-fine-screen-03

Selectivity When and Where You Want It

The Variable Inter-Roll Opening (VIRO) allows the spacing between the shafts to be independently adjusted at any point along the screen, increasing selectivity.

A smaller opening at the infeed or at the discharge end of the screen may have advantages. In the DiamondRoll® VIRO Screen, all gaps in the screen can be adjusted individually. Achieving varied roll spacing is as simple as changing the shims between adjacent bearing blocks.

diamondroll-fine-screen-lubrication-free-bearings

Simple, Lubrication-Free Drive and Bearings

Continuous loops of chain drive all shafts. A single motor located at the discharge end of the screen drives the chain. The continuous loop chain drive makes the VIRO feature possible, since the chain pitch does not limit the position of the shafts.

Oil lubrication has been eliminated from the side frame, since both the chain and the bearings are lubricated for life. The chain is a high-strength sintered bushing roller chain, with lubricant incorporated into the structure of the bushing itself. The bearings are grease-lubricated ball bearings, sealed at the factory, and require no lubrication in the field. Both are built with long service life and minimal maintenance requirements in mind.

diamondroll-fine-screen-dust-free

Vibration-Free Operation

Rotating rolls create agitation – a tumbling, mildly abrasive action. Turning of the rolls does not cause the bouncing and shaking associated with rotary screens, or screens that rely on the beating of hole-filled rubber mats.
The DiamondRoll Screen comes complete with zero-speed sensors; no vibration or excessive motion sensors are required. No vibration or lateral loading is placed on building structure.

DiamondRoll Fine Screen - Michigan-fitted
diamondroll-fine-screen-shims

Dust Tight Conditions Built-In

The screen frame completely encloses the chips and fines. Steel dust covers are set into the frame above. Chutework connects solidly to flanged openings, making the entire system dust-tight.

Variable Shims

Shims of varying thickness are used between bearing housings to set the gaps between rolls. Easily changed in the field, a thicker shim will result in a larger screen opening.

Fines Screens Rack Tooth Sprockets

diamondroll-fine-screen-trantorque_bushing_with_sprocket

Rack Tooth Sprockets

Rack tooth sprockets fixed to the shafts using Trantor™ bushings drive the shafts via sintered bushing chain. This simple, reliable drive system requires no periodic lubrication. Shaft bearings are sealed for life.

Fines Screens Shafts

diamondroll-fine-screen-shafts

Shaft Features

Shafts are available with a variety of knurl patterns and depths to suit specific application requirements. All shafts are machined from solid, alloy steel and then hard chromed for additional wear resistance. Raised, center bump strips are used with very small gap settings between rolls to maintain knurl integrity.

Specifications: DiamondRoll Fine Screen (imperial)
Roll Width (in)364860728496108
width (in)5062748698110112
# of RollsMotor (HP)Weight (tons)Motor (HP)Weight (tons)Motor (HP)Weight (tons)Motor (HP)Weight (tons)Motor (HP)Weight (tons)Motor (HP)Weight (tons)Motor (HP)Weight (tons)
2031.832.152.37.5------
3052.352.67.53.07.53.510.03.9104.3104.8
4052.87.53.27.53.7104.315.04.8155.3155.9
50--7.53.8104.5155.115.05.8156.4157.1
60--104.4155.2156.015.06.7159.51510.2
70------209.120.010.02010.92011.7
80------2010.320.011.32012.32013.3
90------2011.520.012.62013.72514.8
Specifications: DiamondRoll Fine Screen (metric)
Roll Width (m)0.91.21.51.82.12.42.7
width (m)1.271.61.92.22.52.82.8
# of RollsMotor (KW)Weight (mt)Motor (KW)Weight (mt)Motor (KW)Weight (mt)Motor (KW)Weight (mt)Motor (KW)Weight (mt)Motor (KW)Weight (mt)Motor (KW)Weight (mt)
202.21.82.22.142.35.55.5------
3042.342.65.53.05.53.57.54.07.54.47.54.8
4042.85.53.25.53.87.54.3114.9115.4115.9
50--5.53.97.54.5115.2115.8116.5117.2
60--7.54.5115.3116.0116.8119.61110.4
70------159.21510.11511.01511.9
80------1510.51511.41512.41513.5
90------1511.71512.81513.918.515.0

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The DiamondRoll® Fines Screens brochure

Request the DiamondRoll fines screen machine brochure provided to you in PDF format for easy reading and printing.

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Case Study: Fines Screening with Rotary and Roll Screens

Three factors affect the overall performance of a roll screen. These are knurl depth, IRO, and roll speed. Knurl depth is the most important because the overall dimension of the depth of the valley is such a dominating factor in controlling the capture characteristic of the shaft itself.

VIEW CASE STUDY

Case Study: Pulping System Sensitivity to Chip Quality

In many mills the pin chip losses can be limited by the use of a DiamondRoll™ screen on the rotary screen fines. The roll screen can trim the amount of wood that passes out as boiler fuel.

VIEW CASE STUDY

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Over a century of experience engineering equipment and machinery for pulp and paper, sawmill, panel board and biomass industries.

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By thinking about the raw materials and using Acrowood’s equipment, customer literally save millions of dollars versus other approaches at a standard pulp mill. As a result, Acrowood equipment is used in the majority of all chemical pulp being produced in North America.

Shipping Address

Acrowood Corporation
4425 S. Third Ave.
Everett, WA 98203
USA

Mailing Address

Acrowood Corporation
PO Box 1028
Everett, WA 98206-1028
USA
Tel: 1 (425) 258-3555
Fax: 1 (425) 252-7622

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  • Home
  • About
    • Executive Team
  • Products
    • Debarking Machines
      • Batch Debarker
      • Continuous Rotary Debarker
    • Chipping
      • Whole Log Chipper
      • Slant Disc Chipper
      • Veneer Chipper and Feedworks
      • Rechipper
      • Chip Cracker
      • Chip Slicer
    • Screening
      • Trillium® OSB Strand Screen
      • Disc Thickness Screen
      • HD Disc Scalping Screen
      • Dual Drive Suspended Rotary Screen
      • DiamondRoll® Fines Screens
      • DiamondRoll® Thickness Screens
      • DiamondRoll® Particle Screen
    • Distribution & Separation
      • Air Density Separator
      • Star Feeder
      • Screw Distributor
  • Development Center
  • Case Studies
  • Expertise
    • Pulp Mills
    • Saw Mills
    • Panel Board Mills
    • Biomass & Pellet Mills
    • DiamondRoll Shaft Wear [Assessment Guide]
    • Blacksmithing custom bolts the old fashioned way [Technical Article]
  • Contact
  • Jobs
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