Technical & Wire Specification Guide

Welded Wedge Wire Screens

Welded wedge wire screens (also known as 'V' shaped wire or johnson screens) are manufactured using a triangular shaped profile wire which are resistance welded into support rods. Manufactured either in flat form or spirally wound cylinders before forming into flat sheets. This creating a strong versatile filter media in a variety of wires, sizes and slot openings with non clogging characteristics. These are some of the wedge wires many advantages for a diverse range of applications which covers but not limited to dewatering, filtering, screening, separation, drying.

Some advantages include:

High mechanical strength
Long Life
Precision slot sizes
High open area
Non clogging characteristics
Easy for back washing

Construction

Aperture - The gap or slot opening between the profile wires.
Length - Describes the length of profile wire and direction of apertures / slots.
Width - Also known as the support / cross rod direction.
Pitch - Confirms the distance between the support / cross rods.

Materials of construction - 304, 316L, 430, Duplex stainless steel. Others on request.

wedge wire specification guides | Optima International

Standard Range

Flat wedge wire screen

Slot - from 0.05mm (50 Micron)

Size - 3000mm x 2000mm (Max)

Profile - Flat or tilted (10 deg. Tilt max)

All our products are bespoke manufactured. Please contact us to discuss your requirements.

From design to manufacture

Cylindrical wedge wire screens

(Spirally Wound)

Slot - from 0.05mm (50 Micron)

Orientation - Wires Radial

Diameter - from 20mm O/Dia to 1330mm O/Dia

Length - from 50mm to 6000mm

FOTI - from Out to In Filtration

All our products are bespoke manufactured. Please contact us to discuss your requirements.

wire specification guides | Optima International

Fabricated Components

Cylindrical wedge wire screens

(Re-rolled and seam welded)

Slot size - from 0.05mm (50 Micron)

Orientation - Wires Axial or Radial

Diameter - from 90mm I/Dia to 2500mm I/Dia

Length - 100mm to 3000mm

FITO - from In to Out Filtration

All our products are bespoke manufactured. Please contact us to discuss your requirements.

Looped Wedge Wire

Looped wedge wire screens is an alternative filter media which is manufactured without the need of welding wires to support rods. This type of wedge wire works similar to the welded alternative but has some basic advantages in the use of vibrating screens due to its flexibility.

More details can be found under Looped wedge wire in the Products section.

Radial Slot (Standard Design)

For filtration from outside to inside of the cylinder (FOTI).

Filter Out to In (FOTI)

The profiles are welded with the widest profile dimension outermost to the support rods.

Cylinder Filtration (FOTI)

The outside having the flat smooth side of the profile wire to the working surface. Slots running radially around the cylinder

Radial slot (Reverse Wire)

For filtration from inside to outside of the cylinder (FITO). The wire is welded radially with the inner surface being interupted by the position of the internal support rods.

Filter In to Out (FITO)

The triangular profile wire is reversed so that the widest part of the profile wire is welded to the internal support rods allowing fo the in to out filtration.

Cylinder Filtration | Optima International

Cylinder Filtration (FITO)

The outside section of the cylinder having the pointed part of the triangular profile wire with the flat working surface on the inside.

Axial Slot

Filtration from inside to out (FITO). Profile wires and slot running parallel to the length.

Filter In to Out (FITO)

The flat working surface of the trisngular wedge wire profile is on the inside of the cylinder.

Cylinder filtration (FITO)

Support rods welded to the profile wires are running radially around the circumference.

SB Standard Welded Wedge Wire Profiles

Even, tapered sides with a widening slot offers little resistance to passing materials, causing little danger of pegging by marginal particles and allowing easy passage of liquids through the screen. The SB profile has numerous applications and is available in a range of stainless steel qualities.

PROFILE

W

H

A˚

KG/MTR

22SB

1.5

4.0

6.2

0.037

28SB

2.2

4.5

10.2

0.057

34SB

2.8

5.0

11.7

0.078

42SB

3.1

6.0

11.1

0.096

50SB

3.4

7.5

9.7

0.135

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Special Application Welded Wedge Wire Profiles

Special profile wires are available in a range of stainless steel qualities.

PROFILE

W

H

A˚

KG/MTR

QP1843

1.8

4.5

6.9

0.045

QP2535

2.5

3.5

14

0.050

34MF

2.7

4.2

14

0.066

1/8" GRIZZLY

3.2

5.5

5

0.113

QP465

4

6.5

14

0.132

QP560

5

6

20

0.144

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US Standard Profiles

Even, tapered sides with a widening slot offers little resistance to passing materials, causing little danger of pegging by marginal particles and allowing easy passage of liquids through the screen. The SB profile has numerous applications and is available in a range of stainless steel qualities.

PROFILE

W

H

A˚

KG/MTR

11US

0.75

1.8

7.4

0.0072

12US

1

2

10.6

0.0099

18US

1.5

2.5

12.6

0.0188

22US

1.8

3.7

9.9

0.0338

VIEW TECHNICAL IMAGES

SBB Standard Welded Wedge wire Profiles

Even, tapered sides angled at 4˚ in the upper part reduce the rate of slot widening. A high proportion of marginal or unsuitably shaped particles may cause some pegging and blocking. The profile is recommended for use when sieve life is of prime importance and where the slow taper effect causes no problems. The SBB profile is available in a range of stainless steel qualities.

PROFILE

W

H

A˚

KG/MTR

34SBB

2.2

5

4

0.074

42SBB

2.8

6.5

4

0.120

50SBB

3.4

7.5

4

0.147

76SBB

5

10

4

0.329

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Standard Looped Wedge Wire Profiles

Looped profile wires are available in a range of stainless steel qualities with Ø8mm cross rods at 70mm pitch.

PROFILE

W

H

A˚

KG/MTR

28F

2.3

3.8

11

0.072

32F

2.6

4.3

12

0.096

35F

2.9

4.7

13

0.111

39F

3.2

5.3

13

0.146

42F

3.5

5.7

13

0.181

VIEW TECHNICAL IMAGES

HS Standard Welded Wedge Wire Profiles

The almost parallel sides of the wear heads mean that this profile can be used when there are no marginal particles which may cause blocking. The slot width is maintained even when there is wear of the sieve surface. Only when the wear head has worn away is there any slot widening. The HS range is available in manganese steel only.

PROFILE

W

H

A˚

KG/MTR

6HS

5

7

16.7

0.200

8HS

6.8

9.4

17

0.370

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Standard Welded Cross Rod Profiles

A variety of special cross rod sizes are available on request. Standard cross rod pitches are 25mm & 50mm.

PROFILE

W

H

A˚

KG/MTR

Q20T

2

3

N/A

0.040

Q35T

3

5

N/A

0.084

Q44T

4

N/A

0.089

Q50P

4

6

N/A

0.148

Q55T

4

7.5

N/A

0.190

QP750

4

10.5

NA/

0.298

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Standard Support Rod Profiles

A variety of special cross rod sizes are available on request. Standard cross rod pitches are 25mm & 50mm

PROFILE

W

H

A˚

KG/MTR

10x2

2

10

N/A

0.157

12.7x2

2

12.7

N/A

0.200

15x2

2

15

N/A

0.236

20x2

2

20

N/A

0.314

25x2

2

25

N/A

0.393

20x3

3

20

N/A

0.471

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Special Cross Rod Profiles

PROFILE

W

H

A˚

KG/MTR

QP3.8D

3.8

5.6

N/A

0.110

QP6D

6

7.8

N/A

0.224

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Special Support Rod Profiles

PROFILE

W

H

A˚

KG/MTR

QI32

1.15

3.18

N/A

0.033

VIEW TECHNICAL IMAGES

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If you need some help or advice regarding any of our products, simply give us a call, or fill in the form below, and we will try to answer your question as soon as possible.

Alternatively email us directly on

sales@optima-international.co.uk or

info@optima-international.co.uk

Head Office

+44 (0) 1302 874128

info@optima-international.co.uk

Optima International Ltd.
Optima House, Askern Road, Toll Bar, Doncaster, DN5 0QY. England

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