Custom molding of thermoset elastomers : a comprehensive by Bernie Stritzke

By Bernie Stritzke

This ebook covers chemistry of thermoset elastomers yet merely to the level wanted for figuring out how one can technique them via a producing atmosphere and the way they react in a variety of production equipment. the point of interest of the e-book is to supply in-depth assurance of tooling, processing, and secondary operations which can increase production efficiencies. precise and simple to appreciate diagrams reveal particular stipulations and the way they are often greater upon. leading edge rules and options are shared and mentioned. Partial Contents: creation to Thermoset Elastomer Chemistry. Compounding, blending and gear. fabrics. Product layout. fabric checking out for TSE. Polymer circulation. Molding equipment and similar subject matters.

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However, an elastomeric washer with the same dimensions will fit easily onto the shaft by stretching the washer. Does this mean that elastomeric parts can afford to have more liberal tolerances than rigid parts? The simple answer is that it depends. The product design engineer needs to understand what features of the product design are indeed significant, and to what extent. 5 are RMA’s (Rubber Manufacturers Association’s) recommended tolerances for various conditions. The charts are broken down into degrees of precision, A1 to A4.

Developing a material to meet certain physical properties can be a challenging and time-consuming task. Not only does the material need to meet physical and chemical requirements at ambient environments, it needs to be tested in the end product’s environment and subjected to its intended abuse. For instance, an O-ring designed to seal gasoline would need to be tested for compression set in a gasoline bath for an extended period of time. Additional complications arise for the chemist when he attempts to match the material’s environmental properties with manufacturing processability — a critical step that is all too often overlooked.

3 4 Product Design Design To understand how to design a custom molded TSE part, the engineer must know about the molding process. As explained throughout this book, TSE has some very unique features — namely elasticity — that are very desirable in the design of seals, gaskets, vibration dampeners, expansion joints, tires, bladders, etc. The nature of TSE’s elasticity stimulates some unique and creative designs that cannot be molded in other materials. Undercuts, ribs, and lips (see Fig. 1) are squeezed, flexed and distorted during removal from the mold which would destroy the same part molded with other materials.

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