Wedge wire screen

Overview

Wedge wire screen is a type of purifying screen, which is composed of profile wires and support rods. The profile wires are usually triangle wire and the support wire of wedge wire screen can be triangle wire, round bar, flat wire or wedge wire. Wedge wire screen has various types and specs. The type of wedge wire screen is mainly according to the shape of the screen. There are many types of wedge wire screens.

Main types are as follows-

Wedge wire screen panel
Wedge wire screen tube
Wedge wire screen cylinder
Wedge wire screen support grid
Wedge wire sieve bends
Wedge wire nozzles
Wedge wire screen basket
Wedge wire lateral assemblies

Wedge wire screen with cylinder, panels and nozzle shapes is commonly used in the mine, coal, chemical and water treatment for filtering and screening.

Common Advantages of Wedge wire screens are-

Various shapes
Various applications
Accurate specs
Strict inspection
Perfect package
Short delivery time

Wedge wire screen is prepared with profile wire, woven or welded and support rods. Accordingly, it can distribute into two major types: woven wedge wire and welded wedge wire.

From two basic forms, almost all shapes and sizes can be developed according to the customer’s wish,namely:
– slot tubes;
– flat screens.
The filter elements can be provided with fastenings, reinforcements …
In most of these cases a drawing will be submitted to the customer for approval. After welding these accessories to the filter elements,further treatment can be provided to improve the surface quality:
– degreasing and pickling (standard);
– hardening mainly by tenifer treatment and hard chromising;
– mechanical and electrolytical

Working Priciple

What Are Slot Tubes?

Trislot slot tubes are composed of a surface profile that is spirally wrapped around axial support profiles and attached to each other by resistance welding. These filter elements have the unique advantages of very accurate, narrow, slot openings and perfect roundness all in one.

Slot tubes can be provided with the necessary end pieces for attachments and/or reinforcements.

Slot Tube

Filtering

Filtering

Filter cycle

During the filter cycles the solids are deposited on smooth surface.

This ‘cake’ acts as an extra filter for finer particles.

The fines that sleep through do not get stuck in the conical slots.

Backwashing

Backwashing

Back wash cycle

By reversing the flow, the cake and dirt are removed from the filter surface.

Specifications

Standard Constructions

Profile	Support Wires	Min	Min. Slot Width
		in mm	in mm
4S	Q22 or Q25	20	0.0015^[4
5S	Q22 or Q25	20	0.0015^[4
6SC	Q22	20	0.0015^[4
10S	Q25	20	0.0015^[4
11S	Q22 or Q25	21	0.0015^[4
12S	Q25	21	0.0015^[4
	Q35	30	0.05
18S	22S or Q35	30	0.05
	Q25	25	0.03
	D45	300	0.2
	10X3	300	0.2
22S	22S or Q35	45	0.05
	D45 or 10X3 or 25X3	300	0.2
28S	Q35	215	0.2
	D45 or 10X3 or 25X3	300	0.2
34S	Q35	300	0.2
	D45	300	0.2
	10X3 or 25X3	300	0.2
42S	Q35 or D45	300	0.2
	10X3 or 25X3	300	0.2

O.D.	Number of Support Profiles
in mm
30	8
45	10
57	12
70	18
85	18
97	20
110	24
137	30
164	36
215	48
268	48
305	40
380	48
460	60
510	64
628	80
924	180

Standard Constructions

Standard Constructions

Profile	Support wires	Min slot	Standard pitch
		in mm	in mm^[2]
11S	Q25	0.03	17/22
12S	Q25/Q35	0.03	17/22
	10X3	0.1 </	17/25
18S	Q35	0.05	17/25
	Q35/10X3/25X3	0.1	25/70
22S	Q35	0.05	17/25
	Q35/10X3/ till 50X3	0.12	25/70
28S	Q35/10X3/ till 50X3	0.15	17/25/70
34S	Q35/10X3/ till 50X3	0.15	17/25/70
42S	Q35/10X3/ till 50X3	0.15	17/25/70
50S	10×3 till 50X3	0.15	70

	Max. surface profile length	Max. suport profile length
Pitch 17mm/Profile Q25	810mm	2000mm
Pitch 17-22mm/Profile Q35	2700mm	3000mm
Pitch 22mm	710mm	1650mm
Pitch 70 mm	3000mm	3500mm

Applications

Trislot welded screens can be used as flat filters or processed to make cylinders.

Flat Screens

– Static sieves for dewatering or classification: the screen is set up at a curtain angel or is curved so that the surface profile are perpendicular to the filtration direction. Through gravitation the slurry flows over the screen.

– Vibrating screens, dryers and coolers: screens used as support for the product that has to be treated.

– Band filters: screen as support for paper or textile, for example for the separation of cutting oil

– Support screens: in the application, the screens are assembled inside vesseles to support catalyst, active carbon, resin, molecular sieve…

– Beer bottoms

Support Screen

Beer Bottom

Cylinders and baskets

– Drum screens with or without internal transport screw.

– Centrifuge baskets and cylinders for the food and paper and pulp industry.

– Starch screens

– Screw presses

Heavy Continuous cylinder for screw presses

Curved Screens

Curve direction and filtration

Direction are to be determined by the customer.

Testimonials

1. “Recently we had a very large international project with a tight and strict schedule. Together with Trislot, we developed the
supply plan to meet the project requirements. During production, we had another very good customer submit an emergency Purchase Order which also required the high quality level of Trislot filter elements. Trislot immediately reacted and together we achieved the required delivery of both projects. MAHLE Industrial Filtration sincerely appreciates our relationship and the customer service of this premium quality supplier.”

Darren Morgan
Vice President (Operations)
MAHLE Industrial Filtration USA, Inc

2.“We have been trading partners with Trislot for many years now, and we hope our partnership can last for many years more.
The service and quality we demand would be absolutely unattainable elsewhere. Trislot always provides us with the best answer, even when faced with those ‘unplanned’ moments.”

Allen Moss
Russell Finex Ltd, UK

3.“Trislot® has offered valuable design input, high quality products, and on-time deliveries for PSL for many years. Trislot’s flexible approach to design, excellent technical knowledge and customer focus has forged a valuable partnership between Trislot® and PSL in the pharmaceutical marketplace.”
PSL
Vice President (Operations
Powder Systems Limited, UK