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Blow molding is the process of forming a molten tube (referred to as the parison or preform) of thermoplastic material (polymer or resin) and placing the parison or preform within a mold cavity and inflating the tube with compressed air, to take the shape of the cavity and cool the part before removing from the mold.

The major difference between injection molding and blow molding is the kind of product produced. Typically, blow molding is designed to produce hollow, singular containers, such as bottles. On the other hand, injection molding is used to produce solid pieces, such as plastic products.

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Blow Molding Materials. Materials include different grades of polyethylene, polypropylene, nylon, and PET, PET being the most common (used for making bottles). The materials are chosen for their physical properties, cost and environmental utilization. Charloma currently molds parts using HDPE, and Polypropylene.

In general, the molds for blow molding are less expensive than those for injection molding because they can be made of aluminum which is easier to machine than steel. Because of the higher pressures and generally higher volume of injection molding, those molds are usually more expensive.

Advantages: Because of lower pressure, the mold costs in extrusion blow molding are lower as compared to injection molding and the machinery costs are low as well. Also, it's easy to mold external threads. Making open-ended parts that are large can be done by splitting open a closed molding.

Material granules for the part is fed via a hopper into a heated barrel, melted using heater bands and the frictional action of a reciprocating screw barrel. The plastic is then injection through a nozzle into a mould cavity where it cools and hardens to the configuration of the cavity.

Core - A core is a device used in casting and moulding processes to produce internal cavities and reentrant angles. ... The cycle begins when the mould closes, followed by the injection of the polymer into the mould cavity. Once the cavity is filled, a holding pressure is maintained to compensate for material shrinkage.

Plastic moulding is the process of shaping plastic using a rigid frame or mould. ... A popular manufacturing option, plastic moulding techniques are responsible for many car parts, containers, signs and other high volume items.

Below are the most common thermoplastics used in injection molding.

  • Acrylonitrile Butadiene Styrene. Acrylonitrile Butadiene Styrene (ABS), is an opaque thermoplastic and amorphous polymer. ...
  • Polyethylene. ...
  • Polycarbonate. ...
  • Polyamide (Nylon) ...
  • High Impact Polystyrene. ...
  • Polypropylene.

The position of change from speed control to pressure control is set at the point where either screw position or injection pressure reaches a certain fixed value. A mold is a hollow metal block into which molten plastic is injected to from a certain fixed shape.

Core Plate / Cavity Plate. A steel device to mold a molding material into a certain shape. The section that is engaged in opening / closing movement is called a core plate, and the section that is not is called a cavity plate. ... The core plate leaves a trace on a part, because it has an ejector pin to push the part.

Plastic injection molding presses are classified or rated based on tonnage, or more specifically the clamping pressure or force. Presses can run in size from less than 5 tons of clamping pressure to over 4000. The higher the press ton rating, the larger the machine.

The shot size is the maximum amount of plastic injection mold that can be injected in one molding cycle

An ancillary product is a product that is acquired as a bonus or add-on purchase when buying another product.

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