Adhesive Applications on Filters

Adhesive applications on filters are as diverse as the supplies they filter.  We’ve selected a few typical applications that detail how and why adhesives are employed.

*   SEALING THE ROLLED SEAM ON THE BASE PLATE
* BONDING RUBBER GASKETS TO THE BASE PLATE
* BONDING FILTER ASSEMBLY TO THE END PLATES
* SEALING DISC SHAPED FILTERS

SEALING THE ROLLED SEAM ON THE BASE PLATE

Rolled seams are found in oil filters, fuel filers, and air filters.  They are formed by cold rolling the edges of two metal flanges like the lid of a tin can.  Generally the “can” is rotated although a stationary set of rollers moves in to crimp the can closed.

Anaerobic sealants and rubber based solvent sealants are used to seal this seam.  The rubber based solvent sealants are much less pricey by the pound but normally discovered to be a lot more costly in the overall process when reject rates, hazardous shipping and disposal are factored in.  Also 1 ought to take into account that solvent based goods call for far more sealant per component, considering that only about a third of the material is solids that seal and the other 66% is going into the atmosphere or into expensive solvent recovery units.

Anaerobic sealants are far more environmentally friendly, non flammable, 100% solids and lend themselves to automation.  Anaerobics cure in the absence of oxygen and the presence of metal at room temperature.

BONDING RUBBER GASKETS TO THE BASE PLATE

Elastomeric gaskets are discovered on the base plates of oil filters, hydraulic fluid filters, pharmaceutical filters, biomedical filters and food and beverage filters.  Choosing an adhesive to attach these gaskets is largely dependent on the temperature and chemical resistance required of the filter.  Adhesives with ISO 10993 testing are desired for biomedical applications and FDA approval is required for food contact applications. Both cyanoacrylates and epoxies are commonly utilised.  If both cyanoacrylates and epoxies meet the requirements goods are chosen based on the desired assembly procedure.

In oil filters, cyanoacrylate adhesives are typically utilised to bond the gasket to the outside of the base plate as they resist upwards of the 200F requirement, and are oil and gasoline resistant.  This gasket helps to appropriately seat the oil filter when it is installed on the engine.

BONDING FILTER ASSEMBLY TO THE END PLATES

Metal filter assemblies can be welded to the end cap but more usually manufactures prefer to use single component epoxies to bond the filter assembly.  The adhesives offer a simpler process which does not damage the media as welding can and also gives extra assurance of seal because the epoxy is utilised as a potting compound and a bonding agent.

SEALING DISC SHAPED FILTERS

Procedure market disc shaped filters created of metal housing and metal mesh media can be welded or sealed with an anaerobic or epoxy depending on the end use requirements.

Disc shaped poly or paper media within plastic housings are assembled via solvent or ultrasonic welding or bonded.  Again the temperature and resistance requirements dictate the sort of adhesive utilised but normally ultraviolet &amp visible light curable adhesives exceed the bond strength of epoxies on plastics and exceed the fluid resistance of cyanoacrylates.  If designing a plastic housing with the intent of bonding the components as opposed to welding, a tapered tongue and groove joint supplies maximum assurance of seal.

Do not hesitate to contact the adhesive manufacturer for recommendations on your certain application.