This page includes SL (Sprial Logic) Screw Assembly videos including a technical presentation and injection molding machine demos running the SL Screw.

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SL Screw Assembly Detailed Technical Presentation

The Principle: The GS loading system precisely meters the resin into the barrel by synchronizing with the speed of the screw. The 14:1 L/D screw, which is designed with no compression zone, achieves a first-in/first-out, even movement of the resin through the barrel. Finally, a positive-locking non-return valve blocks backflow and eliminates inconsistencies associated with a conventional check ring.

The Result: A homogeneous melt and stable process are maintained, and uncontrolled shear heating, material stagnation/degradation, random short shots and black spots are virtually eliminated. Additionally, barrel wear, carbonization and maintenance requirements are reduced. Working together with Sumitomo (SHI) Demag’s Z-Molding capabilities for consistent and complete low-pressure filling and effective venting of gases, the industry’s highest level of shot-to-shot repeatability and defect-free parts is achieved.

Applications: Medical, optical, connector and other high-precision parts requiring zero-defect molding.

The SL Screw Assembly is available on Sumitomo (SHI) Demag’s SE-DUZ, SE-EV-A and SR-Z all-electric machines for parts sized from fractional grams up to 244 grams (8.7 oz).

SE50EV All-Electric with SL Screw: Lens Molding

Sumitomo (SHI) Demag SE-EV all-electric injection molding machine equipped with the SL (Spiral Logic) Screw Assembly running an 8-cavity mold for a 0.003 g lens for a mobile phone (shot weight 1.7 g).

SE50EV All-Electric with SL Screw: PPS Molding

Sumitomo (SHI) Demag SE50EV all-electric injection molding machine molding a PPS (polyphenylene sulfide) joint weighing 22.6 grams. The machine is equipped with the SL (Spiral Logic) Screw Assembly.

SE130EV-HD All-Electric Injection Over-Molding Demonstration

Sumitomo (SHI) Demag SE130EV-HD (High Duty) all-electric injection molding machine demonstrating over-molding of an automotive steering component using PA6 resin on a metal tube. The shot weight is 200 grams and the mold would typically be run in a 220-ton machine. A 45 mm SL (Spiral Logic) Screw Assembly is used in this demo.

SR50Z All-Electric Vertical Injection Molding Machine Intrusion Molding Demo

A Sumitomo (SHI) Demag SR50Z all-electric vertical injection molding machine with a rotary table demonstrates intrusion molding of 8-cavity PBT insulator housing. The machine is equipped with an SL (Spiral Logic) Screw Assembly and a special intrusion system. The shot size is 66.7 grams.

Medical Micromolding Demonstration on an SE50DUZ All-Electric with SL Screw Assembly

Medical micromolding demonstration on a Sumitomo (SHI) Demag SE50DUZ all-electric injection molding machine with 25 mm SL (Spiral Logic) Screw Assembly. Injection molded part is an Ultem 0.0772 g barb stop used in US Endoscopy’s iSnareTM System. Mold, process and sample parts in glass case: Sansyu FineTool, Ltd. and Makuta Technics, Inc.

Use this link for more information on the SL Screw Assembly.