Product Description

Our Backward Pumping Kneading Block is manufactured using the latest heat treatment techniques, including vacuum hardening, which ensures the highest level of durability and strength. Additionally, the product undergoes polishing and sandblasting treatments to enhance its surface finish and resistance to wear and tear.

With a tolerance of 0.02 mm, our Backward Pumping Kneading Block is designed to deliver precise and accurate results, making it an essential tool for any industrial process that requires high levels of accuracy. The product conforms to the highest industry standards, including DIN, GB, and more, ensuring maximum compatibility and ease of use.

One of the key features of our Backward Pumping Kneading Block is its exceptional hardness, with a rating of HRC 58-62. This ensures that the product can withstand the most demanding industrial applications and provides reliable performance under even the harshest conditions.

Whether you're working in plastics, rubber, or other industries, our Backward Pumping Kneading Block is the perfect tool for your needs. Its unique design and high-quality construction make it a versatile and reliable choice for a wide range of applications, and its exceptional durability ensures that it will provide years of reliable service.

Features:

• Product Name: Backward Pumping Kneading Block
• Wear-resistant: High
• Heat treatment: Vacuum Hardening
• Hardness: HRC 58-62
• Treatment: Polishing/Sand Blast
• Features: Backward Pumping, Kneading, Heating
• Also known as: Reverse Flow Mixing Block, Reverse Pumping Kneading Block, Reverse Material Flow Kneading Block

Technical Parameters:

Tolerances	0.02 mm
product name	Backward Pumping Kneading Block
Hardness	58-60HRC
Brand Name	Nanxiang Machinery
Surface Treatment	Polishing/Sand Blasting
Materials	SAM10/SAM39/WR5/WR14/W6Mo5Cr4V2
Place of Origin	Sichuan , China
Warranty	6 months
Screw Range	Φ 15.6 - Φ 430mm
Suit For	Pharmaceuticals Extrusion Chemical Extrusion Food Extrusion Powder Coating Extrusion

Types of the Screw Segments

Materials

1. For wear application:

Tool Steel : W6Mo5Cr4V2;
PM-HIP material : SAM10 SAM26 SAM39 CPM10V CPM9V

2. For corrision application:

Nitrided Steel: 38CrMoAI;
PM-HIP material : SAM26 SAM39 CPM10V CPM9V

3. For wear and corrision application:

WR14 and WR45

Support twin-screw extruder brand

Tool Steel

Production Process

	NO.1 Workblank Select high-quality raw materials
NO.2 Piecewise According to the drawing section length
	NO.3 Hit bottom hole Rough machining the bottom hole,and then pull spline
NO.4 Machining thread Professional high-end processing equipment,rough machining threads
	NO.5 Finish machining thread
NO.6 Threading grinding Further control of tolerance Length:-0.01mm-+0.01mm OD:-0.03mm-0mm Transition arc:-0.02mm-+0.02mm

Our Service

Product accuracy

There are some differences between Nanxiang Machinery and Nanjing's production technology. Their finishing process is carried out before heat treatment, and the deformation after heat treatment is not controlled, so their accuracy is not easy to control. But our finishing process is carried out after heat treatment, which can eliminate the deformation of parts in heat treatment, so the precision is higher, and thus can achieve zero seam connection.

Packing&Delivery

Packing Details: According to your order quantity packaging, shipping wooden boxes, air carton.

Delivery Details: 20-60days after order.

Packing

According to your order quantities and products sizes to choose wooden boxes or cartons to pack:

a. Rust-proof oil processing,

b. Oiled paper packages,

c. Bubble wrap package,

d. Special foam packaging,

e. Packing,

f. Sealing.

Customer Trust

Certificate

Why choose us?

Nanxiang Machinery is a specialized manufacturer of precision-machined components for twin-screw extruders, including threaded elements, kneading blocks, mandrels, super-hard screw accessories, and wear-resistant alloy steel sleeves. Our products are widely applied in renowned international brands such as Coperion, Lerstritz, Berstorff, KOBE, and JSW, serving industries like plastics, food, feed, pellet manufacturing, pharmaceuticals, and new energy.

FAQ

Q: What material is used for the kneading block?
A: Our kneading blocks are made from high-wear-resistant materials such as high-speed steel (W6Mo5Cr4V2), powder metallurgy alloys (WR5, WR13, WR14), and stainless steel for corrosion resistance.

Q: What is the hardness level of the kneading block?
A: The hardness varies depending on the material used, typically ranging from HRC 58-65 for wear-resistant alloys and HV 950-1100 for nitrided components.

Q: How does the kneading block improve extrusion performance?
A: The block enhances material mixing, dispersion, and shearing, ensuring a more consistent and high-quality extrusion process while reducing material degradation.