Filter Bag 101

Industrial Filter Manufacturing Limited Liquid Filter Bag Basics

Filter Bags Advantages
Ease of installation
Low cost
Simple to operate
Quick change of the filter bag
Filter Bag technology emerged strong in the 1960’s and 1970’s offering the following advantages:
Versatile across varied industries, applications
and operating conditions
Competes and compliments other filter methods

Filter Bag Systems
Open Systems
Low pressure or gravity
Adaptor Head Filter Bags
Tie-on filter bags
Closed Systems
Pressurized Housings
Pumped fluid
Wide range of filter bags

Adaptor Head and Tie-on Filter Bag
Open system
No support for the bag
Low pressure and low flow rate
Usually single pass
Minimal capital investment cost
Types of Filter Bags
Mesh and Felt
Drawstring or clamped bags
Adaptor head filter bags

Closed System
Pressurized Filter Bag system
Traditionally uses a pump
Includes a pressurized filter housing
Accommodates higher flow rate and greater pressure
Single or multiple pass through the filter
Side stream or full flow
High dirt loading
Easy change out system
Many bag styles available

Closed Filter Bag System
Made up of three
main components:
The filter vessel
The restrainer or support
basket
The filter bag

Filter Vessel
Standard Sizes
Size is determined by understanding the application
Viscosity
Flow rate
Temperature
Pressure
Dirt loading
Desired Micron retention
Micron distribution of contaminate

Vessel Types
Side Entry:
Fluid enters vessel through the side
Simple construction
Economical
Fasten the lid with a band clamp or swing bolts

Vessel Types
Top Entry:
Fluid enters the vessel through the top
Lid acts as the hold down mechanism for the bag
Easy change out
Better bag sealing

Vessel Types
Duplex
Two separate systems share the same inlet and outlet
Double the filtration capacity by increasing the surface area
Use of isolation valves allow a change-out without interrupting process flow

Vessel Types
Multi Bag
Used in high flow or high dirt applications
Optional inlet and outlet configurations
Many lid constructions available for ease of use
Housing anywhere from 3 to 24 filter bags

Restrainer Basket Perforated or mesh stainless steel construction
Creates a “bypass free” environment
A seal is created between
the bag and the basket
and the housing
Provides critical support
for the bag
Bag can not withstand the
pressure and flow without
the basket support

Filter Bag
Made up of three basic elements
Filter Media
Retainer
Options

1. Filter Media
Mesh
Felt
Melt blown micro-fibre
Spun bond / point bond
Multiple layers of
varying materials

Mesh Polyester multi-filament
Nylon and Polyester
Surface Filtration
Precise openings
Low fibre migration
Can be washed and reused
Nylon Mono-Filament

Felt
most commonly Polyester and
Polypropylene fibre construction
Depth Filtration
3 Dimensional Filtration
Complex structure creating
a torturous path for dirt
Glaze or Singed Surface

Full Media Product Line
Oil Removal Bags
4 levels of oil removal capability:
POMF, POMB, PSORB, OWS
Extended Felt
Thicker Loftier felt
High Efficiency Bags
High Efficiency Particle retention

2. Retainers
Zinc plated carbon steel ring
Stainless steel snap band
Stainless Steel Ring
Plastic Flange
Plastic ring
Draw String
Elastic
O-ring

Options and Accessories
Custom Manufacturing
Material Sourcing
Sample replication
Specialty bags
FDA compliance
Silicone Free Certification

Applications where filter bags used?
Potentially anywhere fluid is being processed
Pharmaceutical
Automotive
Food and beverage
Waste and process water
Petrochemical
Paint and Chemical
Works well in partnership with other filtration methods

Fully welded bag
No needle holes
Eliminates thread issues
Strength equal to other welded bags
Economic manufacturing process

Steel Ring welded bag
Minimal needle holes
Integrated handles
No Lump seam
Economic manufacturing
process

Industrial Filter Manufacturing Filter Bags
Competitively Priced
Quality Controlled Manufacturing Process
Consistent Performance
Reliable Deliveries
Focus on customer service and support

Filter Bag 101

by Cher Cunningham

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