Injection Molding: Two-Shot Screw/Plunger Machines Now Come Standard
New horizontal injection machines feature two-shot capability as standard.
Plustech, Inc., Schaumburg, Ill., is offering new versions of the Sodick GL Series horizontal injection machines with two-shot capability. While this had been a special configuration in the past, it is now a standard offering. The GL Series has two stage injection, with an angled, fixed screw feeding a horizontal plunger. This V-Line configuration is duplicated in the second injector, which can be vertical or side-mounted and has shot capacities from 2 to 27 cc. LSR capability is available for the second injector. GL Series two-shot machines come with clamp force of 30 to 200 tons. In Asia, these systems are used for molding connector seals, small cellphone components, and medical devices.
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One of the important process parameters to establish and record for any injection molded part is its injection or fill time. Research research reveals the limitations of popularly taught methods of establishing this critical parameter.
Most molders work with two parameters for establishing second-stage pressure. But within Scientific Molding there are actually four.