WEVO: Reliable adhesive bonding for filters
Pretreatment with Openair plasma ensures optimum adhesion in the bonding of filter end caps.
For over 60 years WEVO-CHEMIE has developed, produced and sold
electrical casting resins and adhesives based on polyurethane and
epoxide resin. Predominantly manufacturers in the fields of the
electrical/electronics industry, automobile electronics and the filter
industry are supplied with these products.
One of the special challenges in the filter industry is the adhesive
bonding of filter end caps. Here very good adhesion is required even
under extreme operating conditions involving, for example, prolonged
exposure to oil at temperatures of about 150 °C. A further difficulty in
this process is that before bonding the end caps are often slightly
soiled with oily accretions. Pretreatment with plasma provides a
suitable method in this case for ensuring a rapid bonding process and
avoiding expensive cleaning operations on the surfaces.
Numerous customers of WEVO-CHEMIE are very successfully employing the
Openair® atmospheric pressure plasma developed by Plasmatreat and by
this means achieving optimum adhesion of PU and epoxy adhesives to
polyamide end caps.
Another field of application for this plasma pretreatment is found in
the production of automobile sensors. Special polyurethane casting
resins are typically used for this purpose. Here, as a general rule,
there is the risk that in plastics having a high glass fibre content or
in the case of non-polar surfaces the components will be infiltrated
with moisture in demanding service life tests and as a result failures
will occur. To prevent this in this field also, critical surfaces have
been successfully pretreated by means of Openair® plasma immediately
prior to the casting process.
Dr. Christina Benedek
Technical Sales Manager