Flexible sealing elements

Mold Technology - Flexible Sealing Elements for the Flash-and Damage-Free Encapsulation of Inserts... 

The reliable encapsulation of inserts - without damage and at the same time inexpensively and without flash formation - is possible through the use of flexible sealing elements A 4200 (MurSeal ), Figure 2.124 shows the use of such seals in an example of a wrist strap for car doors. 

FIGURE 2.124 Application of flexible sealing elements for flash-and damage-free encapsulation of metal inserts... 

Innovation through the application of flexible sealing elements... 

The material for the flexible sealing element has been produced in cooperation with the company Murtfeldt Kunststoffe GmbH Co., Dortmund. The distribution was handed over to Hasco Hasenclever GmbH in April 2006. In these respective companies, a practical solution called A 4200 (MurSeal ) from the plastics processing industry is available as a semifinished part. 

In order to achieve sufficient stability against the cavity pressure and optimum heat dissipation, the sealing element A 4200 (MurSeal ) must be embedded into mold inserts made from mold steel. The attachment of the flexible sealing elements can be done by screwing, clamping, or by a frictional connection using locking pins. 

Savings with flexible sealing elements can not only be achieved through a reduced unit cost but by allowing the user to be able to increase quality standards and minimize rejection rates. 

Examples for the first instance are rigid-flexible combinations, e.g. a flexible seal injected onto a rigid structural component. In the second case, rearlights or computer keyboard elements come to mind. 

The standard unpressurized dual mechaiucal seal (previously referred to as a tandem mechanical seal) shall be a balanced seal (with two flexible elements and two mating rings in series). Unpressurized dual mechanical seals shall be designed to withstand pressurization of the bnffer flnid to 275 kPa (40 psig). 

When molded or premolded packages cannot be used for whatever reason, for example, a need for hermetic sealing, modules using ceramic substrates (or PCB-printed circuit board) offer almost unlimited flexibility. They can be used for simple multichip modules containing two or more elements (e.g., a sensing element and an evaluation circuit), may include external components, or may be used to construct complete systems. Stress-optimized package configurations for sensitive microsystems and sensors are no problem (Fig. 5.8.4). 

VulkoIIan . [Bayer Miles] Water-crosslinked polyurethane elastomer for pun diaphragms, coupling elements, solid dres, rollers, pump housings, seals, wipers, bush and split sections ftK antifriction bearings and flexible couplings. 

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