About Zhejiang Zhongyang Screw Manufacturing Co., Ltd. - Plastic Processing Machinery Supplier in China

Zhejiang Zhongyang Screw Manufacturing Co., Ltd. is based in China and currently lists five active products in its catalogue. The company focuses on components for plastic processing equipment, specifically screws and barrels used in injection molding and extrusion machines. Its catalogue includes an injection molding machine screw barrel, a single injection machine screw barrel, a single extruder machine screw and barrel, an extruder machine screw and barrel, and a twin conical screw barrel for PVC applications. Each item falls under the broader categories of Plastic Processing Machinery and Extrusion Machines, reflecting the supplier’s specialization in core mechanical parts for polymer shaping processes.

Product Range and Specialties of Zhejiang Zhongyang Screw Manufacturing Co., Ltd.

The five listed items cover both injection molding and extrusion screw‑barrel assemblies. In the industry, injection molding screws are commonly fabricated from hardened tool steel such as H13 or P20, with tolerance grades of ±0.02 mm on diameter and length to ensure consistent melt conveyance. Extruder screws, especially twin‑conical designs for PVC, often use wear‑resistant alloys like 1.2367 (X153CrMoV12) and may feature L/D ratios between 20:1 and 30:1 to balance shear and pumping efficiency. Typical product specifications include screw diameters from 30 mm to 200 mm, barrel lengths ranging 200 mm to 800 mm, and surface finishes measured in Ra ≤ 0.8 µm. Buyers usually request material certificates, hardness values (HRC ≥ 45 for H13), and dimensional drawings to verify compliance with these standards.

Trade and Export Information - Zhejiang Zhongyang Screw Manufacturing Co., Ltd.

Chinese exporters of plastic processing machinery frequently ship to Southeast Asian manufacturers, European OEMs, and North American converters, using containerized loads that fit standard 20‑ft or 40‑ft containers. The relevant HS chapter for these components is Chapter 84 (machinery and mechanical appliances), with sub‑headings such as 8477 for parts of injection molding machines and 8479 for other machine parts. Importers typically require CE marking for equipment sold in the EU, and ISO 9001 certification is commonly requested to demonstrate quality management. Additional certifications such as UL or CSA may be needed for North American markets, while the Chinese export documentation often includes a commercial invoice, packing list, and a certificate of origin. Logistics norms involve palletizing the heavy screw‑barrel assemblies, securing them with metal straps, and using wooden crates for larger extruder units to prevent damage during sea freight.

Sourcing from Zhejiang Zhongyang Screw Manufacturing Co., Ltd. - Buyer Guidance

When sourcing these screw‑barrel assemblies, buyers should request detailed product data sheets that list material grade, heat treatment, dimensional tolerances, and wear‑resistance specifications. Test reports confirming hardness, impact strength, and corrosion resistance are standard documents that help verify suitability for high‑temperature polymer processing. It is advisable to obtain a sample or a small trial order to assess fit with existing equipment, and to confirm that the supplier can provide CE or other market‑specific conformity certificates before finalizing a purchase. Verifying the supplier’s ISO 9001 registration and inspecting the packaging plan (e.g., crate dimensions, cushioning material) can reduce the risk of damage during transit.

What types of screw‑barrel assemblies does Zhejiang Zhongyang offer?

The catalogue includes an injection molding machine screw barrel, a single injection machine screw barrel, a single extruder screw and barrel, an extruder machine screw and barrel, and a twin conical screw barrel designed for PVC extrusion.

Which material grades are typical for the listed screws?

Industry practice uses hardened tool steels such as H13 or P20 for injection molding screws and wear‑resistant alloys like 1.2367 for PVC extrusion screws, with hardness values of at least HRC 45.

Are dimensional drawings or specifications available?

Buyers should request detailed engineering drawings that specify screw diameter, length, L/D ratio, and barrel dimensions, which are standard for evaluating compatibility with molding or extruding equipment.

What certifications should a buyer ask for?

Typical certifications include ISO 9001 for quality management, CE marking for EU markets, and any material test certificates that confirm grade and heat‑treatment compliance.

How are the products packaged for export?

Heavy screw‑barrel units are usually palletized, secured with metal straps, and placed in wooden crates or reinforced containers to protect against vibration and impact during sea freight.

What are the common HS codes for these components?

These parts fall under Chapter 84, with sub‑headings such as 8477 for injection molding machine parts and 8479 for other machine components, which are used by customs authorities worldwide.

What is the typical lead time for an order?

Lead times depend on the specific screw‑barrel size and material but generally range from 4 to 8 weeks after order confirmation and receipt of required technical drawings.

Is a minimum order quantity (MOQ) required?

Suppliers of industrial screw‑barrel assemblies often set MOQs based on the machining setup; a typical MOQ is one complete set of screw and barrel, but larger batch orders may receive price breaks.