The injection mold is usually temperated during the complete cycle.
The time from the end of packing phase until ejection is called residual cooling time (blue line in the time-pressure diagram below).
During this time the cooling of the part takes place solely.
With this gate design, the plastic melt is introduced circumferentially or almost circumferentially into a rotationally symmetrical area of the molded part. The resulting ring-shaped melt feed provides a uniform distribution of the flow front and can reduce weld lines, one-sided orientation, and uneven shrinkage. The ring gate is often used for sleeve-, tube-, cup-, or disc-shaped injection molded parts where symmetrical filling and low warpage are important. Its design influences pressure loss, packing pressure transmission, demolding behavior, and subsequent gate separation from the part. Depending on the mold concept, gate removal may be performed mechanically, by break-off, or by means of a designed separation edge.
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A plug-on injection unit to an existing injection molding machine used for multicolor or multicomponent molding is called Secondary Injection Unit.
It is equipped with its own controller and is flexible in installation. It can be mounted on top or on non-operator side of a tool. The Secondary Injection Unit can inject into the parting line as cold runner system or into a hot runner system.
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Especially for big parts as well as if weld lines shall be avoided sequential injection is useful.
This means that valve gates will be opened and closed one after the another.
Weld lines can be avoided by overflow the gate before opening it.
The quality of the part is improved.
Short flow length make it possible to reduce the filling pressure.
Opening and closing single gates allows to get the packing pressure in requested areas.
An important part of a unit cost calculation is the process of setting up an injection mold.
Set-up is the preparation of the injection molding machine for the production of a specific molded part.
This includes setting up the molds, adjusting the machine parameters and checking the production processes.
The aim is to ensure smooth production. Efficient set-up is therefore crucial in order to maximize productivity and ensure the quality of the parts produced.
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