Enclosed HR sets

The link between proper functioning of an HR system and the correct choice of system components and their installation, on the one hand, and the trend towards less mould treatment and shorter delivery times on the other, have combined to lead some manufacturers to offer enclosed HR sets. These sets are built from normal components or made up to individual orders when these components are not available to build the required mould, e.g., special shape or size of manifold, special nozzle length. 

A major benefit arises from the use of ready-made HR sets in the case of HR systems with shut-off nozzles with built-in pneumatic or hydraulic drive. 

The set is equipped with all the essential power (plug-in sockets), cooling and compressed air connections, and also with installation pillars and bushings, as well as threaded holes for attachment to the cavity plate. The set is thus ready to be installed on the mould, and it is also possible to remove the set from the mould on the injection machine with subsequent ease of replacement of a damaged tip or nozzle heater. The set is tested prior to delivery. 

One design novelty in the HR set described, is the way the nozzle seal is ensured by clamping it to the manifold using a set of disc springs (24). The leakproofing of the system is thus made independent of the operating temperature, i.e., the thermal expansion of the manifold (in other words, the set may be used for different plastics with a processing 

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The design of the enclosed HR set (see Figure 4.97) shown in a position separate from the rest of the mould is based on a similar principle this position is therefore prior to installation with the mould or after opening on the injection machine for servicing of the nozzles. 

Figure 4.97 Enclosed HR set in position separated from mould Reproduced with permission from Dynisco HotRunners)...

Example The positive-ion high-resolution (HR) FAB spectrum of a cationic fluorescent marker dye shows the signal of the analyte ion enclosed by a set of mass reference peaks due to the admixture of PEG 600 (Fig. 10.13). The elemental... 

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