Please activate JavaScript!
Please install Adobe Flash Player, click here for download

Sealing technology manual for the process industry - Precision molded parts

PRECISION MOLDED PARTS Molded parts are components that cannot be assigned to a standardized group in terms of their geometries and applications; instead, they are designed for specific sealing applications. In complex applications, it is often difficult if not impossible to use standard components to ensure an optimal sealing function. In such cases, molded parts are designed to pre- cisely match the application in question – the molded part becomes a customer-specific solution. This can be accom- plished by modifying a standard component, for example an O-ring, or by designing the materials and geometry for an entirely individualized molded seal. Typical molded seals in the food and beverage industry include butterfly valve seals and U-packings, as well as impellers for pumps. Another typical example for molded parts is a pig. Pigs se- cure a residue-free cleaning process and an efficient use of products. Freudenberg offers pigs made from highly resist- ant low-friction-elastomers like EPDM and Fluoroprene® XP. The use of a molded seal is preceded by a comprehensive development process, in which the customer is usually closely involved. Not infrequently, Freudenberg is also al- ready involved at the start in a machine or component de- velopment in order to ensure high system reliability from the outset with specially matched sealing solutions. Function Various sealing functions, depending on the requirement and component, such as: • Pressure-free sealing through the use of restoring force • Self-amplifying sealing function under pressure • Reduction of incoming pressure • Sealing against media permeation Dimensions Vary widely depending on the design and application, from only a few millimeters up to one meter. Types • Elastomer composites in material combinations with metals, ceramics or plastics • Precision molded parts • Elastomer bellows • Extruded profile sections Design notes When developing molded seals, the user and the seal man- ufacturer should work together intensively from the outset in order to avoid unnecessary steps and to keep the develop- ment time as short as possible. So as to preclude the need for multiple revisions, new versions and repeated testing in the development process, Freudenberg can use FEM analysis prior to construction of the sample mold in order to deter- mine potential strains on and deformations of the molded seal, taking into account the temperature and swelling. Installation and assembly Please refer to page 94 for general installation and assembly instructions. Product portfolio 82

Pages Overview