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Then they add that material back into the raw injection mold design engineering that goes into the injection molding press. This material is referred to as "re-grind". Typically, quality control departments will limit the amount of regrind that is allowed to be placed back into the injection mold design engineering.

Some performance properties of the plastic can degrade as it is molded over and over. Or, if they have a lot of it, a factory can sell this re-grind to some other factory who can use it.

Injection moulding - Wikipedia

Typically regrind material is used for low-quality parts that don't need high performance properties. Injection Molding is very repeatable.

That is, the second part you produce is going to be practically identical to the first one etc. This is a wonderful characteristic when trying to produce brand consistency and part reliability in injection mold design engineering volume production.

Up front costs tend to be very high due to design, testing, and tooling requirements.


If you are going to produce parts in high volumes you want to make sure you get the design right injection mold design engineering first time. That is more complicated than you might think. Getting the design right includes: Designing and then prototyping the part itself to specification Initial prototype development is typically completed on a injection mold design engineering printer and often in a different material such as ABS plastic than the final part will be constructed in Designing an injection mold tool for an initial production round Typically generating injection molded prototypes in the production material requires the development of an injection mold tool.

Plastic Injection Mold Design Basics - School of Continuing Education

Moulds are generally made from tool steelsbut stainless steels and aluminium moulds are suitable for certain applications. Aluminium moulds are typically ill-suited for high volume production or parts injection mold design engineering narrow dimensional tolerances, as they have inferior mechanical properties and are more prone to weardamage, and deformation during the injection and clamping cycles; however, aluminium moulds are cost-effective in low-volume applications, as mould fabrication costs and time are considerably reduced.

When thermoplastics are moulded, typically pelletised raw material is fed through a hopper into a heated barrel with a reciprocating screw. Upon entrance to the barrel, the temperature increases and the Van der Waals forces that resist relative flow injection mold design engineering individual chains are weakened as a result of increased space between molecules at higher thermal energy states.

This process reduces its viscositywhich enables the polymer to flow with the driving force of the injection unit.


The screw delivers the raw material forward, mixes and homogenises the thermal and viscous distributions of the polymer, and reduces the required heating time by mechanically shearing the material and adding a significant amount of frictional heating to the polymer.

The injection mold design engineering feeds forward through a check valve and collects at the front of the screw into a volume known as a shot. When enough material has gathered, the material is forced at high pressure and velocity into the part forming cavity.

Injection Mold Design Engineer

The exact amount of shrinkage is a function of the resin being used, and can be relatively predictable. Often injection mold design engineering times are well under 1 injection mold design engineering.

Once the screw reaches the transfer position the packing pressure is applied, which completes mould filling and compensates for thermal shrinkage, which is quite high for thermoplastics relative to many other materials. The packing pressure is applied until the gate cavity entrance solidifies.

Due to its small size, the gate is normally the first place to solidify through its entire thickness.