Plastic Injection Molding Process
The thermoplastic injection molding process at Wintech Rapid is a standard process involving an aluminum mold with no heating or cooling lines running through it, which means cycle times are a bit longer. It allows our molders to monitor fill pressure, cosmetic concerns, and the basic quality of the parts.
The plastic injection molding process is a manufacturing method for producing plastic parts. Before the process begins, an experienced mold maker creates the mold or tool used to make the part. The mold includes two halves (core and cavity) and contains all the geometry and features that make up the part specifications.
Once created, the mold is loaded into a plastic injection molding machine where the process is performed. A hopper holds thermoplastic pellets, which are fed into the barrel of the machine. Friction between the rotating screw and barrel melts the pellets. Hydraulic or electric toggles close the mold halves and press them together with hundreds of tons of pressure.
The rotating screw then advances a preset distance injecting a prescribed volume of the molten plastic into the mold cavity under high pressure (many thousands of PSI). Once the material enters the mold, it begins to cool and solidify to conform to the shape of the mold. After the material cools sufficiently, the mold is opened automatically and the part is ejected from the core by a number of ejector pins.
No reground material is allowed in Wintech Rapid.
Wintech rapid always uses brand material for the injection.
Dupot, Bayer, BASF, Sabic as well as lots of material agents are our long-term partners that we have can provide a material COC (Certificate of Conformity) as well as a RoHS report to show proof and guarantee that real resin is used.
We can mold anything from inexpensive commodity resins like PP, HDPE, and styrene to engineering resins like PC, POM, nylon, and TPE all the way to ultra-performance materials like PEEK, polyimide, polysulfone, PPS, and more. And if your needs include fiberglass-reinforced resins, we can accommodate those as well.
Color and finishing
The ranges of finishes we can provide are almost limitless. We routinely polish our tools so that clear parts are truly transparent and we can take that one more step if optical-quality clear parts are required. We can also chemically etch our tools to replicate a wide variety of textured finishes, including selectively textured parts where some areas are textured while other areas remain gloss or matte. As far as colors go, if you provide a color chip, we can match it in most resins. We can also utilize overmolding to achieve both functional and cosmetic improvements.
The general tolerance we apply in injection parts is DIN 16901. If you need a tighter tolerance,
We always recommend that you present this information clearly at the quoting stage and also identify the critical and assembly dimensions first. Injection material, tooling structure, and the part’s geometry are impacted on tolerance.