By G. Et Al Polaski
Read or Download Bonding Elastomers : A Review of Adhesives and Processes PDF
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Extra resources for Bonding Elastomers : A Review of Adhesives and Processes
Core preparation throughout the industry is performed in a variety of ways and all serve to provide a clean and consistent anchor proÀle (contour of the core surface) for the adhesive system to attach to. Core preparation is considered the foundation for successful rubber to core adhesion and is crucial to the success of the subsequent process steps to achieve a consistent, high quality, durable bond. Core preparation can be subdivided into two basic categories: chemical and mechanical preparation.
Cores should continue to rotate to reduce the amount of tears that may form on the bottom leading edge. The continued rotation also reduces the dry times for the adhesives. Tears are typically caused by the adhesive’s low viscosity and gravity. In some cases, excessive tearing can lead to failure to the core or failure within the adhesive layer. Since application methods vary, the product’s viscosity may require adjustment with solvent diluents to optimise its application. Adhesive systems are commonly applied by brushing.
Adequate mixing is required for optimal performance of the adhesive system. Hand stirring with a ‘Àgure 8’ motion for 15 minutes is usually sufÀcient to disperse the solids within the solvent system. The purpose of dispersing the solids within the solvent system is to equally distribute the solids within the bulk of the liquid portion. Mixing should continue until all settled material is removed from the bottom and the adhesive has a uniform appearance. The material should be frequently stirred during use, especially if the product is unused over break periods and production shift changes.