This page includes SL (Sprial Logic) Screw Assembly videos including a technical presentation and injection molding machine demos running the SL Screw.
To be informed when new Sumitomo (SHI) Demag videos are available, please subscribe to us on youtube.com at the following link: youtube.com/SSDinNA.
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 maintence 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, SEEV-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.