Understanding the Applications of a 35mm Niigata Screw in Injection Molding Machines

www.completeplastics.com, sales@completeplastics.com, 770-417-6983. Plastic injection molding depends heavily on precise components to ensure quality and efficiency. One such critical part is the screw inside the injection molding machine. The 35mm Niigata screw with an overall length of 36.81 inches plays a vital role in several Niigata machine models. This post explores where this screw fits, its specifications, and why it matters for injection molding operations.

Close-up of 35mm Niigata screw with 36.81-inch length, showing detailed threads and tip assembly

Understanding the Applications of a 35mm Niigata Screw in Injection Molding Machines

The screw in an injection molding machine is responsible for melting, mixing, and injecting plastic into molds. The 35mm diameter size is a common choice for mid-range tonnage machines, balancing shot size and machine capacity. The overall length of 36.81 inches (about 935mm) allows for an effective length-to-diameter (L/D) ratio, which impacts plasticizing efficiency and product consistency.

Understanding the Applications of a 35mm Niigata Screw in Injection Molding Machines - Niigata, a respected manufacturer of injection molding machines, uses this screw size in several of its models. Understanding which machines use this screw helps operators and maintenance teams source the right replacement parts and optimize machine performance.

Niigata Machines Using the 35mm Screw

Several Niigata injection molding machines rely on the 35mm screw with a 36.81-inch length. These include:

Niigata MD110 Series

• Models: MD110S-6000, MD110SIII

• Type: 110-ton all-electric presses

• Shot Weight: Approximately 124 grams (4.37 ounces)

• Application: These machines are designed for precision molding with electric drives, offering energy efficiency and consistent shot control. The 35mm screw size supports medium shot volumes suitable for automotive parts, consumer goods, and electronics components.

  
  

Niigata MD-S8000 Series

• Generation: 8th-generation all-electric lineup

• Tonnage Range: 100 to 110 tons

• Features: These mid-range machines use the 35mm screw as a standard size, balancing throughput and precision. The screw length and diameter support a typical L/D ratio between 18:1 and 22:1, which is ideal for thorough melting and mixing of thermoplastics.

  
  

Niigata NE Series

• Models: Historical hydraulic or hybrid machines like NE110UA

• Tonnage: 110 tons

• Notes: Older or hybrid models also use the 35mm screw dimension, showing its versatility across different machine types. These machines may be found in facilities with legacy equipment still in operation.

  
  

Key Specifications of the 35mm Niigata Screw

Understanding the technical details of this screw helps in maintenance and replacement decisions:

• Screw Diameter: 35mm (1.38 inches)

• Overall Length (OAL): 36.81 inches (935mm)

• L/D Ratio: Typically between 18:1 and 22:1, which affects melting efficiency and plasticizing capacity

• Tip Assembly: Often paired with an M18x2.5 left-hand thread tip, which is crucial for proper fit and function

• Material: Usually made from hardened steel alloys designed to resist wear and corrosion from plastic materials

  
  

These specifications ensure the screw can handle a variety of thermoplastics while maintaining dimensional stability and durability.

Why the L/D Ratio Matters

The length-to-diameter (L/D) ratio of the screw influences how well the plastic melts and mixes before injection. A ratio between 18:1 and 22:1, common for this 35mm screw, provides:

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• Efficient Melting: Longer screws allow more time and surface area for plastic pellets to melt evenly.

• Better Mixing: Proper mixing reduces defects like streaks or unmelted particles.

• Consistent Shot Weight: Stable shot size improves product quality and reduces scrap.

  
  

Niigata’s design balances these factors to suit mid-range tonnage machines, making the 35mm screw a reliable choice.

Applications of Machines Using the 35mm Niigata Screw

Machines equipped with this screw size are used in various industries, including:

• Automotive: Small to medium plastic parts like clips, housings, and connectors

• Consumer Electronics: Components requiring precision molding and consistent quality

• Medical Devices: Parts that need tight tolerances and clean molding conditions

• Packaging: Caps, closures, and containers produced in moderate volumes

  
  

The screw size supports a range of materials such as ABS, polypropylene, polyethylene, and engineering plastics, making it versatile for many molding needs.

Where to Find Replacement 35mm Niigata Screws

For operators needing replacement screws, specialized suppliers like Complete Plastics offer these parts. They provide:

• Screws matching exact Niigata specifications

• Compatible tip assemblies and accessories

• Technical support for installation and maintenance

  
  

Contacting suppliers directly through their website or phone can help secure the right parts quickly, minimizing machine downtime.

Tips for Maintaining Your 35mm Niigata Screw

Proper maintenance extends the life of the screw and ensures consistent molding quality:

• Regular Inspection: Check for wear, corrosion, or damage on the screw flights and tip.

• Cleaning: Remove plastic residue and buildup to prevent contamination and poor melting.

• Lubrication: Use recommended lubricants to reduce friction and wear.

• Replacement Timing: Replace screws before severe wear affects product quality or causes machine damage.

  
  

Following these practices helps keep your Niigata machines running smoothly.