Understanding the 60mm Negri Bossi Screw and Its Applications in Injection Molding
- Heat Tech
- Feb 23
- 3 min read
www.completeplastics.com, sales@completeplastics.com, 770-417-6983. Injection molding machines rely heavily on the precision and durability of their screws to produce high-quality plastic parts. Among the various screw sizes used in the industry, the 60mm Negri Bossi screw stands out as a common and versatile component for mid-to-large range machines. This post explores the key features, applications, and specifications of the 60mm Negri Bossi screw, helping manufacturers and technicians understand its role in injection molding processes.
Understanding the 60mm Negri Bossi Screw and Its Applications in Injection Molding
The 60mm screw diameter is a standard size for several Negri Bossi injection molding machines, especially those with clamping forces ranging from 270 to 370 tons. This size balances shot volume and pressure, making it suitable for producing medium to large plastic parts efficiently.
Understanding the 60mm Negri Bossi Screw and Its Applications in Injection Molding - The screw’s design influences how plastic material melts, mixes, and injects into molds. A well-matched screw ensures consistent shot weight, proper melting, and optimal pressure, which are critical for part quality and machine performance.
Machines That Use the 60mm Negri Bossi Screw
Several Negri Bossi models are designed to operate with a 60mm screw. These include:
Janus Series
The Janus 330 VJ is a hybrid machine with a 330-ton clamping force. It uses a 60mm bi-metal screw, which offers durability and resistance to wear.
V Series
- V270 Models: The V270-1400 and V270-1450, both 270-ton machines, commonly feature the 60mm screw.
- V160 Series: Some configurations of the V160-610 series can be adapted to use this screw size.
VE (Electric) Series
The VE-370, a 370-ton electric injection molding machine, is specifically designed to work with 60mm replacement screws and cylinders, offering energy-efficient operation.
NB Series
Older models like the NB 300, with a 300-ton clamping force, also use the 60mm screw, demonstrating its long-standing reliability.
Understanding which machines use this screw helps in sourcing the right replacement parts and maintaining machine performance.
Key Specifications of the 60mm Screw Units
The 60mm Negri Bossi screw supports specific operational parameters that influence molding outcomes:
Shot Volume
Typically ranges from 850 cm³ to 880 cm³, allowing for medium to large part production.
Shot Weight
Approximately 760g to 800g when molding polystyrene (PS), a common plastic material.
Injection Pressure
Pressure on the material usually falls between 1700 and 2390 bar, depending on the machine model and injection unit power.
These specifications ensure the screw can handle a variety of molding tasks, from simple to complex parts, while maintaining consistent quality.
When to Consider Replacing the 60mm Screw
Screws in injection molding machines wear out over time due to constant friction, heat, and pressure. Signs that a 60mm screw needs replacement include:
Decreased shot consistency or weight
Visible wear or damage on the screw surface
Increased cycle times or material degradation
Frequent machine downtime due to screw-related issues
Specialized suppliers offer replacement screws, barrels, and screw tip assemblies designed to fit Negri Bossi machines. Choosing the right replacement part ensures continued machine efficiency and product quality.
Where to Find 60mm Negri Bossi Screws and Parts
Reliable sources for 60mm screws and related components include specialized plastic machinery parts suppliers. These suppliers provide:
OEM-quality replacement screws and barrels
Screw tip assemblies compatible with Negri Bossi models
Technical support to ensure proper fit and function
For example, companies like Complete Plastics (contact: sales@completeplastics.com, phone: 770-417-6983) offer a range of parts tailored for Negri Bossi machines. Checking with trusted suppliers helps avoid compatibility issues and reduces machine downtime.
Practical Tips for Maintaining the 60mm Screw
To extend the life of a 60mm Negri Bossi screw and maintain molding quality, consider these practices:
Regularly inspect the screw and barrel for wear or damage
Maintain proper machine settings to avoid excessive pressure or heat
Use high-quality raw materials to reduce contamination and abrasion
Schedule routine maintenance and cleaning to prevent buildup
Proper care reduces the frequency of replacements and keeps production running smoothly.
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