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July 24, 2016 - Assembly

Adhesive Application Methods for Filtration Media: Part Two

In a recent blog, we discussed the spray/melt blowing adhesive application for filtration media. Now, let’s take a closer look at two more application methods:

1. Gravure/Roll/Dot Lamination Adhesive Application Method

This type of adhesive application method is used for any filter media that is paper-like in nature.

What Does This Method Do?

This adhesive application method uses an exact pattern of microscopic “dots” of adhesive to bond a range of similar and dissimilar materials together. These materials include nonwovens, films, fabrics or composites. A rotating gravure roll is used to pick up and deposit the adhesive as the material rolls through the equipment.

What Types of Adhesives are Used?

Hot melt (polyester, polyamide, EVA) and water-based adhesives can be applied to filtration media using the gravure/roll/dot lamination method.

Benefits to using this type of application method include:

  • Consistent pattern application
  • Good control over amount of adhesive applied

However, it’s important to note that this application method has a tendency to reduce filtration efficiency with plugged pores, and it may be tough to changeover from one adhesive to another.

filtration media

2. Web Adhesive Lamination Adhesive Application Method 

This type of adhesive application method is used for media typically compatible with polyester, glass, nylon and certain PP/PET.

What Does This Method Do?

Web adhesive lamination is used to apply pre-melt blown polymer resins (polyesters, polyamides, polyurethanes, polyolefins).

What Types of Adhesives are Used?

Web adhesives are used to bond together two layers of filter media. These versatile adhesives are created using hot melts that are into a web-like, non-woven material that handles like fabric.

In this adhesive application method, the web adhesives come as a “roll”, which is then unwound and sandwiched between the two media layers. The sandwich is pulled through a flatbed laminator, which heats and applies pressure to the adhesive and media. This causes them to bond together.

The finished product is brought through cooling plates, wound and ready to be shipped to the customer.

Benefits to using this type of application method include:

  • Easy handling
  • Minimal equipment needs
  • Maintains filter’s efficiency

For more information on adhesive application methods, call 800-7-BOSTIK.

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