Unusual process in plastics

Unusual process in  plastics

Calender:

To prepare sheets of material by applying pressure between two or more counter rotating rolls. Also the machine performing this process.

Centrifugal Casting:

A method of forming thermoplastic resins in which the granular resin is placed in a rota-table container, heated to a molten condition by the transfer of heat through the walls of the container, and rotated so that centrifugal force included will force the molten resin to conform to the configuration of the interior surface of the container.it is used to fabricated large diameter pipes and similar cylindrical items.

Cold molding:

Procedure in which a composition is shaped at room temperature and cured by subsequent baking.

Drawing:

The process of stretching a thermoplastic to reduce its cross sectional area, thus creating an orderly orientation of polymer chains with respect to each other.

Embossing:

Technique used to create depression of a specific pattern in plastics film and sheeting such embossing in the form of surface patterns can be achieved on molded parts by the treatment of the mold surface by photoengraving and other process.

Extrusion:

Process of compacting and melting a plastic material and forcing it through an orifice in a continuous fashion. Material is conveyed through the heated machine barrel by helical screw .where it is heated and mixed homogeneous state and then forced through a die of the shape required for the finished product.

Flame Treating:

A method of rendering inert thermoplastic objects respective to inks, lacquers, paints, adhesives etc.in which the object is bathed into an open flame to promote oxidation of the surface of the articles.

Fusion Bonding:

Process for joining plastic parts where mating surface are heated to melting and held together under pressure. And also called as hot plate welding.

Hot gas welding:

A technique of joining thermoplastic materials whereby the material are softened by a jet of hot air from welding torch and are joined together at the softened point. Generally the thin rod of the same material is used to fill and consolidate the gap.

Needle Blow:

A specific blow molding technique where the blowing air is injected into a hollow article through a sharpened hollow needle that pierces the prison.