Blow molding is a manufacturing process by which hollow plastic parts are formed. In general, there are three main types of blow molding: extrusion
blow molding, injection blow molding, and injection stretch blow molding. The blow molding process begins with melting down the plastic and forming
it into a parison or in the case of injection and injection stretch blow moulding (ISB) a preform. The parison is a tube-like piece of plastic with
a hole in one end through which compressed air can pass.
The parison is then clamped into a mold and air is blown into it. The air pressure then pushes the plastic out to match the mold. Once the plastic
has cooled and hardened the mold opens up and the part is ejected.
Injection moulding is a manufacturing process for producing parts by injecting material into a mould. Injection moulding can be performed with a
host of materials, including metals, glasses, elastomers, confections, and most commonly thermoplastic and thermosetting polymers. Material for
the part is fed into a heated barrel, mixed, and forced into a mold cavity where it cools and hardens to the configuration of the cavity.[1]:240
After a product is designed, usually by an industrial designer or an engineer, moulds are made by a mouldmaker (or toolmaker) from metal, usually
either steel or aluminum, and precision-machined to form the features of the desired part. Advances in technology now also allow for 3D printing
of injection moulds for certain applications, using photopolymer plastics which do not melt during the injection process. Injection moulding is
widely used for manufacturing a variety of parts, from the smallest components to entire body panels of cars.
Parts to be injection moulded must be very carefully designed to facilitate the moulding process; the material used for the part, the desired shape
and features of the part, the material of the mould, and the properties of the moulding machine must all be taken into account. The versatility of
injection moulding is facilitated by this breadth of design considerations and possibilities.
1. Hot Plate Welding
2. Ultrasonic Welding
3. Plastic Tac Welding
4. Pressure Leak Testing
5. Drilling / Slitting / Riveting
6. Modular Assembly
7. Foam Adhesion
