By G. Et Al Polaski
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Additional resources for Bonding Elastomers : A Review of Adhesives and Processes
Tack coats are usually brush applied to the dried adhesive surface just prior to the rubber lay-up step. The tack coat generally Bonding Elastomers: A Review of Adhesives and Processes dries within 20-30 minutes; shorter periods may be used depending on the type of tack coat adhesive used and plant conditions. Caution should be used when applying a solvent-borne tack coat to reduce the potential of smearing or removing the adhesive system. In most cases, the tack coat is custom manufactured by dissolving a suitable rubber into an appropriate solvent system.
Due to the size of most rolls, surface grinding by hand using a rotary disc, or hand or automated belt sanding 28 is the most common method used to achieve a good proÀle. The disc or belt materials are typically silica or aluminium oxide with a range of 700-180 micron (2580 mesh) grit. The surface proÀle typically created is 25-50 micron (1-2 mil) in height, from peak to valley. The abrasion pattern created with the belt or disc should be randomised to create maximum surface area. Caution must be used during machine lathing, grinding or belt sanding to avoid deep grooving as these processes can lead to potential adhesive system puddling that may result in adhesive failure.
Brushes should be dedicated to the speciÀc adhesive and should be thoroughly cleaned with the appropriate solvent after each use. Brushes should be replaced when worn or damaged and should not be stored inside the adhesive containers. When solvent evaporation occurs, particularly with frequent opening and closing of containers, small amounts of dilution solvent should be added to the adhesive system to return it to its original viscosity. It is important to ensure that the proper solvent and amount is added to the adhesive.
Bonding Elastomers : A Review of Adhesives and Processes by G. Et Al Polaski