Blow Molders
Blow molders create hollow plastic parts using continuously running extruders attached to a tuned die head, forming a parison. The parison is what the air pressure goes through in order to form the thermoplastic tube, held in place with clamps, to the shape of the mold. Blow molders form uniformed finished products that do not need to be joined together in any way.
Injection, extrusion and stretch are three types of blow molding that are used to make various products. Blow molders use injection blow molding to create smaller plastic parts, and they use extrusion for larger and more varied parts. Stretch molding involves a preformed part and can be used by blow molders to make wide mouthed peanut butter jars or narrow mouthed water or liquor bottles.
Blow molders can include continuous extrusion blow molding machines which produce custom containers in either single or multiple cavity tooling. Some blow molders are capable of producing parts from five pounds up to 50 pounds with diameters up to 24 inches. Other blow molders contain molds for two different necks and cores, allowing multiple parts to be made on only one machine.