84mm Nissei Screw - Call Now - 770-417-6983
- Heat Tech
- Mar 1
- 4 min read
www.completeplastics.com, sales@completeplastics.com. Plastic injection molding relies heavily on the precision and quality of its components. One critical part is the screw, which plays a major role in melting, mixing, and injecting plastic material. For machines using an 84mm Nissei screw, understanding its specifications and compatible machine series can help you maintain peak performance and avoid costly downtime. This post covers everything you need to know about the 84mm Nissei screw, including its applications, specifications, and how to source replacements.
What Makes the 84mm Nissei Screw Important
The 84mm screw size is common in larger Nissei plastic injection machines, especially those designed for high-capacity production. These screws are engineered to handle significant shot volumes and provide thorough mixing of plastic pellets before injection. The screw's diameter directly affects the machine's shot size, melt quality, and cycle time.
Nissei Plastic Industrial Co., Ltd. manufactures a range of injection machines, and the 84mm screw is typically found in their larger horizontal and hybrid series. Machines equipped with this screw size are often used in demanding industrial applications where consistency and efficiency are critical.
Compatible Nissei Machine Series for 84mm Screws
If you operate or maintain Nissei injection machines, knowing which series use the 84mm screw can simplify parts sourcing and maintenance planning. The following Nissei series commonly utilize 84mm screws or compatible screw tip assemblies:
FN Series
This hybrid series includes models with higher clamping forces. The 84mm screw supports their need for larger shot capacities and efficient plasticizing.
FS Series
Older hydraulic and hybrid machines in this series often use the 84mm screw diameter. These machines are favored for high-output applications requiring robust screw performance.
FV/FVX Series
Large hybrid machines such as the FVX-III series, with clamping forces ranging from 560 to 1300 tons, use 84mm screws to handle increased shot volumes and maintain melt quality.
NEX Series
Some high-tonnage all-electric NEX models, especially those with injection units like 200B or 280B, can be configured with 84mm screws. These machines benefit from the screw’s ability to deliver consistent melt and shot size.
Before ordering a replacement screw, verify your machine’s injection unit number to ensure compatibility. Nissei offers multiple screw configurations tailored to specific injection units.
Key Specifications of the 84mm Nissei Mixing Screw
When sourcing an 84mm Nissei screw or a specialized mixing screw, it’s essential to understand the standard specifications to ensure proper fit and function:
Screw Tip Assembly
Standard 84mm tips usually have an overall length (OAL) of approximately 10.64 inches and feature a 40-degree nose angle. This design supports efficient plastic melting and flow.
Thread Type
The screw tip assembly commonly uses TR52x3.0 left-hand (LH) threads. This threading ensures secure attachment and proper alignment with the screw shaft.
Length-to-Diameter (L/D) Ratios
Nissei screws in the 84mm range typically have L/D ratios between 20:1 and 30:1. This ratio balances thorough homogenization of the plastic melt with cycle time efficiency.
Material and Coating
High-quality steel alloys with wear-resistant coatings are standard for these screws. This extends service life and maintains performance under high-temperature, high-pressure conditions.
Why Choose a Proper 84mm Nissei Screw Replacement
Using the correct screw size and type is crucial for maintaining the quality of your molded parts and the longevity of your machine. An 84mm screw designed for your specific Nissei machine ensures:
Consistent Melt Quality
Proper screw geometry and length promote uniform melting and mixing of plastic pellets, reducing defects.
Optimal Shot Size
The screw diameter directly influences shot volume. Using the correct size prevents under- or over-injection.
Reduced Wear and Tear
Correct thread types and coatings minimize mechanical wear, reducing maintenance costs.
Improved Cycle Times
Efficient plasticizing shortens cycle times, increasing production throughput.
How to Source 84mm Nissei Screws and Parts
Finding the right 84mm Nissei screw or replacement parts requires working with trusted suppliers who understand injection molding equipment. Here are some tips:
Verify Machine and Injection Unit Numbers
Confirm your machine’s model and injection unit number (e.g., 160A, 200B, 280B) before ordering. This ensures you get the exact screw configuration needed.
Choose Specialized Suppliers
Companies like Complete Plastics and IMS Company specialize in industrial molding supplies and carry Nissei-compatible screws and tip assemblies.
Check Specifications Carefully
Match screw diameter, tip length, thread type, and L/D ratio to your machine’s requirements.
Ask About Custom Options
Some suppliers offer custom screw designs or coatings to improve performance for specific materials or applications.
Consider Surplus and Refurbished Parts
Surplus Record listings sometimes include 84mm Nissei screws and parts at competitive prices. Ensure parts are inspected and verified for quality.
Maintenance Tips for 84mm Nissei Screws
To maximize the lifespan and performance of your 84mm Nissei screw:
Regular Inspection
Check for wear, corrosion, or damage on the screw flights and tip assembly.
Proper Cleaning
Remove residual plastic and contaminants after each production run to prevent buildup.
Monitor Screw Backlash
Excessive backlash can indicate wear and affect shot consistency.
Lubricate Threads
Use recommended lubricants on screw tip threads during installation to prevent galling.
Replace When Necessary
Don’t delay replacement if wear affects melt quality or shot size.
Contact for 84mm Nissei Screw Inquiries
For reliable 84mm Nissei screw replacements and expert advice, contact Complete Plastics:
Website: www.completeplastics.com
Email: sales@completeplastics.com
Phone: 770-417-6983
Their team can help you identify the right screw for your machine and provide fast shipping to minimize downtime.
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