In the design of injection mold following machine specifications are to be considered. As frequently an existing machine or a certain machine size poses an important limitation, to which the design engineer has to submit.
1. Injection pressure:
This is the pressure by which thermo-plastic material is injected into the cavity.
2. Shot capacity:
The amount of melt in grams, which can be conveyed into the mold with one stroke of the screw.
3. Plasticizing rate:
This is the maximum amount of material that may be plasticized to an acceptable melt quality per unit time. It is expressed in terms of weight of polystyrene plasticized per hour.
4. Clamping force:
Clamping force is the force required to keep the mold halves together when injection takes place. Clamping force machine should be more than clamping tonnage required of the mold to prevent escape of the melt at parting surface. If the clamping force is insufficient, “flash” occurs at the mold joint or interface of the mold.
5. Distance between tie the bars:
The tool length and width should be within the distance between the tie bars to mount the tool easily without constraints. This decides whether the tool can be accommodated in the machine or not.
6. Max & Min daylight:
The minimum ‘day light’ is the distance between the mold platens when tool is in closed condition. The maximum daylight is the distance between the die platens when the tool is in open condition. The mold height is required to be larger than the minimum daylight and less than the maximum day light.
7. Ejection stroke:
The depth of the component decides the ejection stroke. Ejection stroke is indicative of the maximum ejection movement available.
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