50mm Screw in Negri Bossi Machines - Available Now - www.completeplastics.com

770-417-6983 / sales@completeplastics.com. Injection molding machines rely heavily on the precision and durability of their screws. For Negri Bossi machines, the 50mm screw stands out as a versatile and widely used size. Whether you operate a mid-range machine or need a reliable replacement part, understanding the role and availability of the 50mm screw can help you maintain optimal production efficiency. This post explores the key features, applications, and sourcing options for the 50mm Negri Bossi screw, with practical insights for machine operators and maintenance teams.

Why the 50mm Screw is Popular in Negri Bossi Machines

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The 50mm screw size is often described as a "mid-range" option in the Negri Bossi lineup. It fits well between smaller screws used in compact machines and larger screws designed for heavy-duty molding. This size balances shot volume and injection pressure, making it suitable for a wide range of molding tasks.

Negri Bossi typically offers three screw sizes—A, B, and C—for each injection unit. The 50mm screw can serve as the "Large" (C) option for machines with a clamping force around 110 tonnes or as the "Small" (A) option for machines rated up to 210 tonnes. This flexibility allows manufacturers to tailor their machines to specific production needs without compromising performance.

Machines and Series Using the 50mm Screw

Several Negri Bossi machine series commonly use the 50mm screw, including:

• NOVA sT Series

The servo-hydraulic NOVA sT range covers clamping forces from 180 to 500 tonnes. In smaller injection units within this series, the 50mm screw helps maintain a good balance between shot size and injection pressure, supporting consistent molding quality.

• Canbio Series

Older Canbio models such as the V130 and V160 often come with a 50mm screw as a standard or "B" screw option. These machines are popular for general-purpose molding, where versatility and reliability are key.

• EOS Series

While the smaller EOS 50 machines typically use screws between 25mm and 28mm, some larger variants in this legacy series scale up to 50mm screws. This allows for increased shot volumes and higher throughput when needed.

Replacement and Custom Screws for Negri Bossi Machines

Maintaining your injection molding machine means sourcing quality replacement parts. Specialist suppliers like Complete Plastics and Telar Corp provide dedicated 50mm screws and 3-piece tip assemblies designed specifically for Negri Bossi injection units. These parts meet OEM specifications and ensure compatibility with your machine’s injection unit.

Ordering from trusted suppliers offers several advantages:

• Precision Fit

Screws are manufactured to exact dimensions, ensuring smooth installation and operation.

• Material Quality

High-grade steel and heat treatments improve wear resistance and extend screw life.

• Custom Options

Some suppliers offer custom screw designs or tip assemblies tailored to specific molding applications.

For inquiries or orders, Complete Plastics can be reached at sales@completeplastics.com or by phone at 770-417-6983.

Understanding Screw Dimensions and Specifications

The 50mm screw refers to the screw diameter, which directly influences the shot volume and injection pressure. The overall length (OAL) of the screw is also important; for the 50mm Negri Bossi screw, the OAL is typically 46.06 inches. This length ensures proper engagement with the injection unit and consistent plasticizing performance.

When selecting or replacing a screw, consider these factors:

• Screw Diameter

Determines the volume of material that can be injected per cycle.

• Screw Length

Affects the melting and mixing efficiency of the plastic.

• Tip Design

Influences the flow and pressure of the molten plastic during injection.

• Material and Coating

Impact wear resistance and compatibility with different polymers.

Practical Tips for Maintaining Your 50mm Screw

To maximize the lifespan and performance of your 50mm Negri Bossi screw, follow these maintenance tips:

• Regular Inspection

Check for signs of wear, corrosion, or damage to the screw flights and tip.

• Proper Cleaning

Remove residual plastic and contaminants after each production run to prevent buildup.

• Correct Installation

Ensure the screw is installed according to manufacturer guidelines to avoid misalignment.

• Monitor Processing Parameters

Adjust temperature and pressure settings to reduce excessive wear on the screw.

• Use OEM or High-Quality Replacement Parts

Avoid generic screws that may not meet the required specifications.

Summary

The 50mm screw is a key component in many Negri Bossi injection molding machines, offering a balance of shot volume and pressure suitable for mid-range applications. It is commonly found in the NOVA sT, Canbio, and EOS series, with dimensions tailored to fit specific injection units. Reliable replacement screws and tip assemblies are available from specialist suppliers like Complete Plastics, ensuring your machine runs smoothly and efficiently.