Introduction to ErtelAlsop Pak® Lenticular Technology
At Purecowater, we pride ourselves on providing top-tier filtration solutions for complex solid and liquid separation challenges. As a distributor and OEM for industry leaders, we are excited to feature the ErtelAlsop Pak® Lenticular Filters. Known as the inventor of the lenticular cartridge format, ErtelAlsop sets the standard for depth filtration media and ease of use.
This product guide explores the mechanism, specifications, and applications of the Pak® series—including the versatile Zeta-Pak® and the pure cellulose Disc-Pak®—to help you determine the best fit for your process line.
What is a Lenticular Filter?
Lenticular filters bridges the gap between traditional plate/frame filters and standard cartridge filters. The design consists of a series of stacked discs, or "cells," assembled onto a central core. Each cell contains depth filter media sealed at the edges, creating a rigid but porous structure.
Unlike surface filters that trap particles only on the outer layer, depth filters utilize the entire thickness of the media. Fluid follows a "tortuous path" through the matrix, trapping contaminants throughout the depth of the cartridge. This results in superior retention of solids, hazes, and gelatinous particles.
Key Advantages
- High Solids Loading: Capable of holding significantly more contaminant than pleated cartridges.
- Scalability: Modular design allows for simple vertical scaling in housing units.
- Closed-Loop System: Prevents product exposure to the atmosphere, protecting against oxidation and eliminating leaks common in plate and frame presses.
- Quick Changeout: Modules are easily inserted and removed, reducing downtime for cleaning and maintenance.
Product Series: Zeta-Pak® vs. Disc-Pak®
ErtelAlsop offers distinct media formulations to target specific industry needs.
1. Zeta-Pak® (The Workhorse)
The Zeta-Pak® represents the industry standard for pharmaceutical and fluid applications requiring high efficiency. It introduces Zeta Potential—an electrokinetic charge that attracts negatively charged particles (like bacteria and haze) to the positively charged media.
- Composition: Cellulose, Filter Aid (Diatomaceous Earth or Perlite), and Wet Strength Resin.
- Mechanism: Mechanical straining plus electrokinetic adsorption.
- Best For: Botanical extracts, fine chemicals, pharmaceuticals, and removing sub-micron haze.
2. Disc-Pak® (Pure Cellulose)
The Disc-Pak® is designed for applications where filter aids like DE (Diatomaceous Earth) are not desired or necessary. It utilizes AlphaMedia™, a pure cellulose format.
- Composition: 100% Cellulose fibers.
- Mechanism: Mechanical depth filtration.
- Best For: Viscous fluids (syrups, oils), dielectric oils, and applications requiring strict chemical purity without mineral leaching.
Technical Specifications
The following table outlines the general operating specifications for the Pak® Lenticular series.
| Specification | Details |
|---|---|
| Diameters Available | 12-inch and 16-inch |
| Micron Ratings | 0.25 µm – 20 µm (Grade dependent) |
| Core Material | Polypropylene (Standard) |
| Gasket Material | EPDM (Standard), Buna-N, Viton, Silicone |
| End Cap Configuration | Flat Gasket (requires center post) or Double O-Ring (plug-in) |
| Cell Count | Typically 16 cells (High Area) or fewer for wide spacing |
End Cap Configurations Explained
- Flat Gasket (DOE): The traditional stacking method. Modules are stacked on a center post and compressed by a top plate. Excellent for existing traditional housings.
- Double O-Ring (Plugin): A modern bayonet-style connection. The module plugs into the base receiver, using two O-rings to create a hermetic seal. This design prevents bypass and simplifies installation.
Common Applications
Thanks to their robust design and media versatility, ErtelAlsop Pak® filters are utilized across a wide spectrum of industries:
Botanical Extraction
Removing waxes, lipids, and activated carbon fines (dewaxing and color remediation). The Zeta-Pak is particularly effective here due to high flow rates and efficient haze removal.
Food & Beverage
Polishing distillation products, filtering syrups, clarifying wines and spirits, and general particulate removal to protect membrane final filters.
Chemical & Industrial
Filtration of dielectric oils, coolants, inks, paints, and varnishes. Disc-Pak modules are often preferred here for their pure cellulose compatibility.
Why Choose ErtelAlsop?
ErtelAlsop invented the lenticular cartridge integration. Their legacy in depth filtration ensures that every module is manufactured with precise density and flow characteristics. When combined with Purecowater’s distribution and OEM capabilities, you get not just a product, but a complete solution tailored to your operational parameters.
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