procedures for developing a new plastic product Below we list a fairly standard sequence of steps that you will probably have to go through in the course of designing and making a new product You can use it as a…
The mould impression Often incorrectly referred to by some engineers as the cavity，the mould impression is a hollow area contained inside the mould into which molten polymer is injected and allowed to cool. When a mould tool contains more than…
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…
New Plastic Molding Part Development: Process, Timing & Shipment | Topworks Topworks Plastic Mold · Huangyan, China sales@plasticmoulds.net · +86 159 6865 2523 Complete Development Guide New Plastic Molding PartDevelopment Guide From CAD concept to shipped products — a 10-step…
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…
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,…
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…
Undercuts An undercut is a part of the mould where the molten plastic flows behind a retaining section thereby preventing the hardened plastic moulding from being easily ejected. Undercuts, in general, require moulds with moving parts to allow the product…
Internal stress and warping When thick sections are moulded，rapid changes in temperature can cause thermally induced stresses due to differential expansion. If surface layers cool faster than the interior through poor conduction, the contraction of the surface will be greater…
