what is the purpose of adapator in mould cooling
Answers
Answer:
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Explanation:
One fundamental principle on injection moulding is that hot material enters the mould, where it cools rapidly to a temperature at which it solidifies sufficiently to retain the shape of the impression. The temperature of the mould is therefore important as it governs a portion of the overall moulding cycle. While the melt flows more freely in a hot mould, a greater cooling period is required before the solidifies in a cold mould it may not reach the extremities of the impression. A compromise between the two extremes must therefore be accepted to obtain the optimum moulding cycle.
The operating temperature for a particular mould will depend on a number of factors which include the following, (a) type and grade of material to be moulded, (b)length of flow within the impression, (c) waII section of the moulding; length of the feed system, etc It is often found advantageous to use a slightly higher temperature than is required just to fill the impression as this tends to improve the surface finish of the moulding by minimizing weld lines, flow marks and other blemishes.
To maintain the required temperature differential between the mould and plastic material, water (or other fluid) is circulated through holes or channels within the mould. These holes or channels are termed flow-ways or water ways and the complete system of flow ways is termed the circuit
During the impression filling stage the hottest material will be in the vicinity of the entry point, i.e. the gate, the coolest material will be at the point farthest from the entry. The temperature of the coolant fluid, however, increases as it passes through the mould. Therefore to achieve an even cooling rate over the moulding surface it is necessary to locate the incoming coolant fluid adjacent to ‘hot’ moulding surfaces and to locate the channels containing ‘heated’ coolant fluid adjacent to cool’ moulding surfaces. However, as will be seen from the following discussion, it is not always practicable to adopt the idealized approach and the designer must use a fair amount of common sense when laying out coolant circuits if unnecessarily expensive moulds are to be avoided.
Units for the circulation of water (and other fluids) are commercially available. These units are simply connected to the mould via flexible hoses. With these units the mould’s temperature can be maintained within close 1 limits. Close temperature control is not possible using the alternative system in which the mould is connected to a cold water supply