Product Description

This mixing block is made using high-quality materials and undergoes a polishing/sandblast treatment to ensure its durability and longevity. It is specifically designed for use in twin screw extruders and is connected using a spline connection method. The Backward Flow Kneading Block is manufactured in Sichuan, China, which is known for its exceptional quality products.

The Backward Flow Kneading Block is also known as the Backward Screw Kneading Block or the Reverse Flow Mixing Block. This product is essential in ensuring the efficient and effective mixing of materials, making it a valuable addition to any twin screw extruder. Its backward pumping technology ensures that materials are mixed thoroughly, while the kneading feature ensures uniformity in particle size distribution. The heating feature also ensures that materials are properly mixed and heated, which is especially important for heat-sensitive materials.

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

Extruder Screw Materials

1. For wear application:

Tool Steel : W6Mo5Cr4V2;

PM-HIP material : SAM10 SAM26 SAM39 CPM10V CPM9V

2. For corrosion application:

Nitrided Steel: 38CrMoAI;

PM-HIP material : SAM26 SAM39 CPM10V CPM9V

3. For wear and corrosion application:

PM-HIP material:SAM26 SAM39 CPM10V CPM9V

4. Other Materials:

Stainless Steel: 316L, C276, SX737 etc.

Types of the Screw Segments

Quality Control

1. Materials control:

1. All the materials are purchased from the domestic brands or Eurpean twin-screw specialty materials suppliers,which tested by elemental analysis and metallurgical inspections to ensure the quality.

2. The internal splines is checked by the spline plug to ensure interchangeability of the elements

3. All components are machined by CNC machines to ensure the shapes and tolerances of the elements

4. Adopt the European high-speed steel powder processing technology,and do the treatment according to the strict heat treatment 4.process to ensure the wear and corrosion performance same as the foreigh brands.

5. Perfessioal technical team can not only provide timely and accurate mapping sample design but also the combination of elements of technical services.

6. There are various prepared technical information and the fitxtures for the various brands extruders to ensure the timely lead time.The common components have a lot of stock, even the new one, it can be delivered within 45days.

7. The modern management system can ensure the products 100% qualified and tracked.

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: Are you a trading company or a manufacturer?

A: We are a manufacturer.

Q: Where is your factory located? How can I visit there?

A: Our factory is located in Chengdu, Sichuan Province, China. You can fly directly to Chengdu Airport, and we will pick you up upon arrival. We warmly welcome all our clients, both domestic and international, to visit us.

Q: How long will your product last?

A: The lifespan of our products can vary greatly depending on the operation time, materials used, and working conditions. Therefore, it is difficult to provide an exact duration.

Q: Are your quotations all FOB?

A: Yes, all our quotations are FOB (Free on Board).

Q: Can I get a one-year warranty for free?

A: Our standard warranty is not free, but we have confidence in the quality of our products. If you require a warranty, it will be available for an additional cost.

Q: How is your after-sale service?

A: We are committed to providing timely support. If you encounter any issues with our products, you will receive our assistance promptly. We strive to ensure you receive the best service possible.