EPDM rubber is commonly used in the automotive industry to make several parts of vehicles including the seals of doors, the trunk, the hood, and the windows. It is also used for other purposes such as temperature controlling because of its insulating properties. Practical uses of EPDM rubber include cold rooms, radiators, garden appliances and electrical insulators, tubes and hoses, washers, solar panels, speakers, and headphones.
EPDM rubber can either be conductive or non-conductive which is why plasma treatment is needed to activate it and to achieve a strong bond between the rubber and the adhesive during the flocking process. It is also needed to wet the rubber in the slip coating stage to obtain the desired properties for adhesion. Plasma treatment is used as a replacement of chemical treatments as chemicals are generally dangerous, low yielding, and high in cost. Read more
The Adhesion problem is common in materials that possess low surface energies. Examples can include High-Density Polyethylene, Polypropylene, EPDM, and Polyethylene etc. With the surface energy ranging anywhere from twenty nine to thirty six Dyne/cm or mN/m (milinewton per meter). Surface treatment of plastic products
Obtaining a level of adhesion on any materials with low surface energy i.e. Polypropylene or Polyethylene etc. can sometimes become extremely difficult because of their slickness. Thus, this adhesion problem leads to the printed ink rubbing off, coatings or paint not sticking on the surface along with failed gluing and weak sealing.
Almost each and every surface open to the elements existing in the ordinary atmosphere goes through water and gas absorption within the molecular bounds. Oxidation processes can also bring about a change in surface conditions. Since exposure leads to the gathering of contaminants on a surface, it is imperative that the surface be treated prior to any kind of adhesion.
The quality of adhesion on a surface depends on the amount of surface energy a material possesses. If the surface energy is low, then the adhesion of coatings or inks is most likely to be unsuccessful. Coating, printing, painting etc. can be done on almost all kinds of surfaces.
But some materials require surface treatment or pretreatment before any actual coating takes place. Surface treatment modifies the surface of a material making it more adherent to the changes that are about to take place. Therefore, solving the adhesion problem becomes quite crucial.
Surface modification is carried out mostly on materials that are too expensive or sensitive for chemical or mechanical treatments. For example, wet chemical techniques create a lot of hassle when it comes to the treatment of surfaces. As many solutions and acids are used in this process to remove the foreign contaminants residing on the surface, the process ends with chemical residue covering the surface.
Hence, another round of cleaning is to be initiated for removing the residue of chemicals that were set to clean that surface in the first place. Other methods or pretreatment include pickling and sandblasting etc. which leave the surfaces more damaged than clean.