Introduction to ErtelAlsop Pak® Lenticular Cartridges
At Purecowater, we specialize in solving complex solid and liquid filtration challenges. As a distributor and OEM for top-tier filtration manufacturers, we are proud to feature the ErtelAlsop Pak® Lenticular Filters. These depth filter modules represent a significant evolution in filtration technology, combining the high throughput of depth media with the convenience and enclosed design of cartridge systems.
Whether you are in the pharmaceutical, food and beverage, or chemical industry, the Pak® Lenticular Cartridges offer a scalable, leak-free alternative to traditional plate and frame filters. This guide explores the specifications, operational benefits, and applications of this versatile product line.
What is a Lenticular Filter?
A lenticular filter module consists of stacked filter cells. Each cell is constructed from a pair of depth filter media sheets (such as MicroMedia® or AlphaMedia®) with their edges sealed to form a disc. These discs are stacked over a central core, resembling a series of double convex lenses—hence the term “lenticular.”
This design maximizes surface area within a compact footprint, allowing for high solids loading capacity and efficient particle retention. The entire stack is housed within a sealed vessel (housing), ensuring a sanitary and leak-free operation, which is a common pain point with older plate and frame presses.
Key Features and Mechanisms
Depth Filtration & Zeta Potential
Unlike surface filters that trap particles only on the top layer, ErtelAlsop Pak® cartridges utilize depth filtration. The media consists of a complex matrix of cellulose fibers, filter aids (like Diatomaceous Earth), and resins. This structure traps particles throughout the thickness of the media.
Furthermore, many ErtelAlsop media grades, particularly the Zeta-Pak®, possess a positive Electrokinetic Charge (Zeta Potential). This charge acts like a magnet to attract and hold negatively charged sub-micron particles (such as bacteria and haze colloids) that would otherwise be small enough to pass through the mechanical distinct pore structure.
Construction Highlights
- Sealed Edges: Filter sheets are sealed using a patented process with polypropylene, eliminating edge leakage.
- Core Design: A robust polypropylene core supports the stack, ensuring structural integrity under differential pressure.
- Gasket Options: Available with flat gaskets or double O-ring ends to fit various housing types.
Technical Specifications
The flexibility of the Pak® system lies in its variety of configurations. Below are the standard specifications available for industrial and sanitary applications.
| Specification | Details |
|---|---|
| Diameters Available | 12 inch (30.5 cm) & 16 inch (40.6 cm) |
| Number of Cells | 5 to 18 stacked cells per module |
| Micron Ratings (Nominal) | 0.25 µm to 15 µm |
| Core Material | Polypropylene |
| Gasket Materials | EPDM (Standard), Buna-N, Viton, Silicone |
| End Configurations | Flat Gasket, Double O-Ring (222, 226 styles) |
Product Series Overview
ErtelAlsop offers several specific media formulations to target different contaminants:
| Product Series | Description | Ideal Application |
|---|---|---|
| Zeta-Pak® | The “workhorse” series containing cellulose and Diatomaceous Earth (DE). High zeta potential. | General chemical, pharmaceutical, haze removal. |
| AlphaMedia® | Pure cellulose media (no DE). Extremely high purity and low extractables. | Pharmaceuticals, sensitive spirits, applications requiring ash-free media. |
| MicroClear® | Impregnated with activated carbon. | Color correction, odor removal, decolorization. |
| Bio-Pak® | Designed with specific grades for biological reduction. | Bio-pharmaceuticals, sterile filtration pre-treatment. |
Why Choose Pak® Lenticular Tech?
1. High Solids Loading
The depth media matrix allows the Pak® cartridges to hold a significant amount of contaminant before plugging. This is crucial for “polishing” applications where surface filters (pleated cartridges) would clog almost instantly.
2. Scalability
The technology is linear scalable. You can start with a single 12″ module for pilot testing and scale up to multi-round housings containing 16″ modules for full production without changing the filtration results. ErtelAlsop offers Horizontal Housings that can hold multiple modules, utilizing a “Lock and Load” system for rapid changeouts.
3. Leak-Free Design
By enclosing the filter stack in a pressure vessel, you eliminate the drip and leakage issues associated with open plate and frame filter presses. This is essential for processing valuable fluids, hazardous solvents, or high-purity pharmaceutical ingredients.
Common Applications
- Botanical Extracts: Exceptional for removing waxes and lipids (dewaxing) in ethanol extraction processes.
- Distilled Spirits: Haze removal and polishing for whiskey, vodka, and gin without stripping flavor compounds (using AlphaMedia®).
- Food & Beverage: Clarification of syrups, juices, and frying oils.
- Chemicals & Utilities: Transformer oil filtration (AquaKv-Pak®) and catalyst removal.
Need Assistance with Sizing or Compatibility?
Choosing the right media grade and micron rating is critical for optimizing your process. Purecowater can help you select the exact ErtelAlsop configuration for your specific stream conditions.