Cast moulding technology is used to pour liquefied material into the cavity of a specifically designed mold and allow it to harden. After solidification process, the piece is separated from the mould to undergo finishing treatment to be used as a final product.

Casting manufacturing is used to create intricate solid and hollow shapes, and thus can be used to obtain products like: automotive components, aerospace parts and cast moulding contact lenses.
Cast Moulding Process

Casting is one of the oldest yet efficient techniques used in a comprehensive range of applications and products involving cast moulding contact lenses. Along with the modern advancement in casting technology- there’s an upswing in the development of a broad array of specialized casting methods.

Gaining hands-on knowledge about a variety of casting processes can help in choosing the best suited method for a given production.

The Types of Casting Processes
Sand Casting: It depends upon silica-based materials like synthetic or naturally-bonded sand. Sand casting consists of finely ground, spherical grains that rest into a smooth moulding surface. This casting process prevents tearing, cracking, or other flaws by allowing a moderate degree of flexibility and shrinkage during the cooling phase of the process.

Investment Casting: Investment or low-wax casting employs a disposable wax pattern for each cast part. The wax is injected into a mold, removed, and then coated with refractory material and a binding agent is put to use to build up a thick shell.

Plaster Casting: Plaster casting is equivalent to the sand casting process which employs a mixture of gypsum, strengthening compound, and water. This plastic pattern is coated with an anti-adhesive compound to disapprove it from sticking.

Die Casting: This process comes handy to mold materials under high pressure. It delivers high component dimensional consistency which is bound to deliver uniform design.

Permanent Mold Casting: Permanent mold casting equivalent to die casting and centrifugal casting. These molds can be created using steel, graphite, lead, zinc or aluminium. As the molds rotate through a variety of stations- they get easily coated, closed, filled or opened.

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