multi-cavity blow mold / mono-cavity / packaging / technical parts



  • Type of mold:

    multi-cavity, mono-cavity

  • Cast parts:

    packaging, technical parts, aesthetic parts

  • Operation:

    large series

  • Applications:

    for the packaging industry, for the automotive industry, for the electronics industry


Blow molding, also called as plastic blowing, is a molding process in which air pressure is used to inflate soft plastic into a mold cavity. It is an important industrial process for making one-piece hollow plastic parts with thin walls, such as bottles and similar containers.

Blow molding is accomplished in two steps: first, fabrication of a starting tube of molten plastic, called parison and second, inflation of the tube to the desired final shape.

There are several forms of blow molding:

Extrusion Blow Molding (EBM): Plastic is melted and extruded into a hollow tube (a parison). This parison is captured by closing it into a cooled metal mold. Air is then blown into the parison, inflating it into the shape of the hollow bottle, container, or part. After the plastic has cooled sufficiently, the mold is opened and the part is ejected.
Injection Blow Molding: It is a process combining injection molding and blow molding. The molten plastic is injection molded around a core inside a parison mold to form the hollow parison. When the parison mold opens, both the parison and core are transferred to the blow mold and securely clamped. The core then opens and allows pressurized air to inflate the parison.
Stretch Blow Molding: For multiwall or multilayer pieces. It is a two stage process similar to that of injection blow molding. First the preforms are made using injection molding or a similar process. The preforms are then heated up, usually with infrared heaters. Then it is blown with high pressure air using metal blow molds while the preform is stretched using a core rod. Compressed air continues to blow in until the preform reaches the wall of the mold