Dongguan Enuo mold Co., Ltd is a subsidiary of Hong Kong BHD Group, the core business is injection mold manufacturing and injection molding. Furthermore, Enuo mold is also an OEM factory engaged in inspection fixture/Gauge R&D, Die casting, CNC machining, Prototype products R&D, Parts spraying and assembly.

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Plastic Injection Molding

Injection moulding consists of the high pressure injection of the raw material into a mould, which shapes the polymer into the desired form.Moulds can be of a single cavity or multiple cavities. In multiple cavity moulds, each cavity can be identical and form the same parts or can be unique and form multiple different geometries during a single cycle. Moulds are generally made from tool steels, but stainless steels and aluminium moulds are suitable for certain applications.

Aluminium moulds are typically ill-suited for high volume production or parts with narrow dimensional tolerances, as they have inferior mechanical properties and are more prone to wear, damage, 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. Many steel moulds are designed to process well over a million parts during their lifetime and can cost hundreds of thousands of dollars to fabricate.

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Injection moulding machines consist of a material hopper, an injection ram or screw-type plunger, and a heating unit. Also known as platens, they hold the moulds in which the components are shaped. Presses are rated by tonnage, which expresses the amount of clamping force that the machine can exert. This force keeps the mould closed during the injection process.

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Plastic Injection Molding History

What is plastic, this substance that has reached so deeply into our lives? The word comes from the Greek verb plassein, which means "to mold or shape." Plastics have that capacity to be shaped thanks to their structure, those long, flexing chains of atoms or small molecules bonded in a repeating pattern into one gloriously gigantic molecule. "Have you ever seen a polypropylene molecule?" a plastics enthusiast once asked me. "It's one of the most beautiful things you've ever seen. It's like looking at a cathedral that goes on and on for miles."

Injection-molding machines—now standard equipment in plastics manufacturing—turned raw plastic powders or pellets into a molded, finished product in a one-shot process. A single machine equipped with a mold containing multiple cavities could pop out ten fully formed combs in less than a minute.

Many of the new thermoplastics at one time or another found their way into combs, which, thanks to injection molding and other new fabrication technologies, could be made faster and in far greater quantities than ever before—thousands of combs in a single day. This was a small feat in and of itself, but multiplied across all the necessities and luxuries that could then be inexpensively mass-produced, it's understandable why many at the time saw plastics as the harbinger of a new era of abundance. Plastics, so cheaply and easily produced, offered salvation from the haphazard and uneven distribution of natural resources that had made some nations wealthy, left others impoverished, and triggered countless devastating wars. Plastics promised a material utopia, available to all.