HR manifolds

The HR manifold is the central component of an HR system in it are the flow channels feeding the melt to the HR nozzles. 

For manifold design or selection, the following conditions should be met provision of identical cavity filling conditions in multi-cavity moulds minimisation of pressure losses in manifold channels  

These conditions should particularly be borne in mind when manifolds are being made by and for oneself. 

In view of these requirements, and of the wide variety of mould designs and methods of installation, many types of manifold have been developed. The main criterion by which they may be divided is the heating method (see Chapter 1.2)  

3 - channel 4 - tip nozzle 5, 6 - manifold plates 7 - insert with cartridge heater  

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A type (a) mould of three-plate design with heated sprue bushing is converted using an HR manifold and nozzles with side gating. The cycle time has been reduced by 35%, and the production cost has fallen by 43%. 

Type of heating. Nozzles have external or internal heating, or both types at once. There are also heat-conducting nozzles. These are short nozzles made of a copper alloy warmed by the heat from the HR manifold. 

Figure 4.59 Main types of HR manifold (taking part of a standard mould base...

Figure 8.10 HR manifold of mould for moulding of two plastics for internal screen of vehicle door. X and Y are the origin of the mould...

The main element in each stack mould is the central plate containing the HR manifold and nozzles and the cavities. One difficult problem which is crucial to the design of the HR system is the way the melt is to be fed to the manifold. 

Figure 9.9 Stack mould with HR manifold adapted to work with angle injection machine Reproduced with permission from Arburg)...

HR manifold in the fixed part of the mould with feed nozzle situated in the external zone of the mould (operating principle as shown in Figure 9.15c) ... 

For P-C-T relationships involving deuterium, a similar procedure was followed. However, studies were limited to the range 0 < D/M 0.01 where D/M represents the deuterium-to-metal atom ratio, and only a 10-Torr, full-scale transducer was used. Deuterium was supplied to the system from a metal deu-teride that was prepared in this laboratory. An alloy of composition TiFeo.gs M11002 (mass 200 g) was activated thoroughly, then outgassed completely at 500° C. The alloy was exposed to deuterium (ultrapure) at 1000 psi for 4 hr, cooled to —196°C, and evacuated. The deuteride reservoir was closed, warmed to room temperature, and moved to the absorption manifold where it served as a high-purity deuterium source. 

FUEL RATE BTU / BHP HR. i RATED LOAD RPM MAXIMUM MINIMUM EXHAUST MANIFOLD WATERCOOL ED [7] INSULATED TACHOMETER... 

A summary of the approximate prices for the components of the double manifold vacuum line is shown in Table II. A more recent estimate (10/86) from our glassblowing shop (labor 24/hr)... 

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