Gli
sono progettati per produrre una parte per ciclo. Sono un approccio conveniente quando i volumi di parti sono bassi in quanto sono meno costosi da costruire. Hanno anche un tempo di consegna più breve. Lo svantaggio è un costo del pezzo più elevato nella produzione di stampaggio.

Gli stampi multi-cavità producono più parti per ciclo. I principali vantaggi sono l'aumento della capacità e la riduzione dei costi dei pezzi, poiché più parti possono essere prodotte in un tempo di ciclo comparabile.

Family Mold
A family mold has a single mold base but two or more different cavities, allowing for the production of two or more different parts. All the parts can either be produced simultaneously or shut-offs can be used to isolate production to selected cavities. For best results in molding, the parts should be similar in size, shape, resin, and anticipated volumes, especially if the intention is to run all parts at the same time. Automation may be necessary to separate the pieces during or after production.

If mold cost is a driving factor and volumes are low, a family mold can provide cost savings and versatility.

Unscrewing Molds
Unscrewing molds are the most common method of creating threaded holes within a plastic part. These molds are automated with small drive systems (rack & pinion, electric, or hydraulic motors) that are tied into the process and rotate threaded features to extract undercut features. Threads can be internal or external, and the extraction is tied into the press cycle.

Multi-shot / multi-component tooling allows a product designer to use two or more dissimilar materials on the same part within the same cycle. There may be a variety of reasons why differing materials would be desired, including different physical properties or simply appearance. These molds often utilize multiple manifolds within one tool. Multi-shot tooling can be an elegant solution for complicated products, and can be used for color changes within a product line.

Specialized presses and molds are necessary to run multi-shot tooling. Multiple machine nozzles, hot runner systems and mold rotation may become necessary. While Matrix currently does not have any multi-shot molding presses on our floor, we are particularly adept at designing and building these complicated tools and have been doing so for decades.

Stampi per canali
caldi utilizzano un collettore a temperatura controllata per ridurre o eliminare notevolmente gli scarti del canale dal ciclo. I punti di iniezione possono essere all'esterno della parte o direttamente nella parte. Ciò può migliorare notevolmente i tempi di ciclo, poiché un sistema di materozza o canale è spesso un fattore determinante nel ciclo dello stampo. Inoltre, l'eliminazione del corridore consente di risparmiare materiale sprecato costoso.

Gli stampi a canale caldo richiedono un regolatore di temperatura per la pressa in cui entrano in funzione, con il controller dimensionato per adattarsi al collettore nello stampo. Alcuni costi di manutenzione dello stampo sono più elevati su uno strumento a canale caldo, ma spesso si ripagano a lungo termine grazie al risparmio di materiale e tempo di ciclo. Ciò è particolarmente vero per le applicazioni che richiedono costose resine di qualità ingegneristica o elevati volumi annuali.

Cold Runner Molds
Cold runner molds are good examples of more traditional tooling in that they utilize sprues and runners to gate into the part. This is typically the least complicated form, however may result in larger amounts of wasted material and slower running cycles. Depending on the application, a percentage of wasted material may be re-ground and re-processed for future use, though this could affect the physical properties of the resin.

Dealing with more advanced, high-cost materials such as engineering and medical grade resins or the inability to use regrind in your application may lend itself to using a more efficient hot runner mold for your project.

Insulated Runner Molds
Insulated runner tools resemble more traditional cold runner molds but utilize cartridge heaters or other methods of heating to form a surrounding layer of molten resin, forming an insulated “”cull”” to create a similar effect to a hot runner system. This approach is less expensive than using a hot runner which requires a temperature controller and also has the benefit of allowing for faster color and material changes. However insulated runners are not suitable for all types of materials and typically do not work well with more demanding engineering grade resins.

Two / Three Plate
Three-plate molds are cold runner tools, but by adding a third plate to the runner system, you are able to locate your injection point into virtually any location on the tool. This is usually less expensive than adding a hot runner system, however this type of mold often has large and unwieldy runners, which can be more difficult to automate.

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