How to identify Faults in injection molding A logical and systematic method of dealing with faults is most desirable, and many practical moulders have their own scheme of operation. In compiling such a scheme, it is important to ensure that…
Injection molding allows mass production of precision plastic parts once the initial molds are made. But successfully navigating this intricate process requires understanding its nuances. This 10-step guide breaks complex mold design into simple, logical stages for flawless execution. 1.…
Optimising time cycle and machine productive time Whatever ideas for cost saving are introduced into the injection moulding of plastic components，ultimately the time cycle of the machine and the rate at which it can be made to produce good saleable…
Cost saving methods The financing and costing of projects take the greatest contribution to profitability. There are，however，some other methods by which cost savings may be achieved. These include rationalisation of material stocks and grades, utilisation of standard material，and the use…
Fixed and variable costs The main fixed cost of the injection moulding process is，of course，the capital cost of the equipment, but other fixed costs—rent of property，rates，etc.— must not be lost sight of. In the world of the entrepreneur—and such people…
Injection moulding process variables and their causes [one_half]Variable [/one_half][one_half_last]Possible cause [/one_half_last] [divider_line] [one_half]Injection pressure [ Dirty oil; blocked filter 2. Faulty pump; cavitation 3. Faulty relief valve 4. Overheated or cold oil [/one_half_last] [one_half]Injection rate [ Overheated oil 2. Air,…
Warping Mouldings warping after removal from the mould are very common and are always the result of frozen-in stress; differential shrinkage or，with filled materials，filler orientation. This is nearly always a processing problem，but it can also be caused by a machine…
Splay marking This fault，which appears on a great many mouldings，shows an area, generally near the gate, which has an uneven, lined appearance.It may be reminiscent of the grooves on a gramophone record or it may appear simply as an irregular…
Splash marks，mica marks，silvering This fairly common fault is easily recognized by the streaky，silver appearance of the moulding, nearly always radiating from the gate area. Cause of the splash marks The cause is the vaporization of volatile matter in the advancing…
Sink marks and voids Sink marks and voids are two manifestations of the same fault, and their complete eradication is extremely difficult. Diagnosis is easy. All plastics take up more volume when molten than when solid，and where there is more…