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Bakelite Thermoset Material Extrusion Injection Screw Barrel
  • Bakelite Thermoset Material Extrusion Injection Screw Barrel
  • Bakelite Thermoset Material Extrusion Injection Screw Barrel
  • Bakelite Thermoset Material Extrusion Injection Screw Barrel
  • Bakelite Thermoset Material Extrusion Injection Screw Barrel
  • Bakelite Thermoset Material Extrusion Injection Screw Barrel
  • Bakelite Thermoset Material Extrusion Injection Screw Barrel

Bakelite Thermoset Material Extrusion Injection Screw Barrel

Unit Price: 100~100000 USD
Min. Order: 1 Set/Sets

Basic Info

Model No.: BMC screw barrel

Product Description



BMC (Bakelite & Thermoset Material) Screw Barrel Injection molding and Extrusion

Ningbo Jinyi Precision manufactures bimetallic barrels and liners for all makes and types of BMC (bakelite & thermoset) material injection molding machinery. Our products are found worldwide operating in mild to severe abrasion and corrosion wear environments.

Single Extrusion Screw Barrel 16 Nbjy


For thermoset materials:

Energy transfer and accurate control of temperature zones is vital to prevent premature cross-linking of the material in the barrel. Thermal jackets positioned around the outer diameter of the barrel and arranged in two or more control zones typically control process temperatures. Barrel outer diameters are designed with OD grooves to accommodate circulating thermal fluid. Length to diameter ratios are lower than that found in thermoplastic molding. The optimum L/D depends on the machine's capacity and the material processed. Most thermoset machines have L/D ratios of 12:1 to 15:1.

Thermoset materials are often reinforced with mineral and fiber fillers that create an extreme wear environment. JINYI recommends a barrel lined with JYK-3 tungsten carbide alloy to sustain life and productivity.

For Bakelite materials:

1. It can be molded very quickly, decreasing production time.

2. Moldings are smooth, retain their shape and are resistant to heat, scratches, and destructive solvents.

3. It is also resistant to electricity, which is for its low conductivity.

3. It is not flexible and makes Bakelite particularly suitable as a molding compound.

For Bakelite injection molding, the barrel temperature is set to 70-90'C to heat (with screw shear) the raw materials flowing. The screw is only for compressing and delivering the material into the mold, without melting it. Mold is heated to a temperature (180'C, for instance) to cure the raw materials



Screw configuration - The compression ratio of the screw for Bakelite is 1:1, and for thermoplastics, it's about 1:3 to 1:4.5.

Process - Molding of thermoplastics involve melting, but for molding of Bakelite, the fusing takes place between particles so as no melting is involved.



Bakelite 01

BMC 02

BMC 03


Ningbo Jinyi Precision Machinery Co., Ltd.

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With over 25 years development, Ningbo Jinyi Precision Machinery Co.,Ltd is now one of the largest companies specialized in manufacturing Screws, Barrels and related accessories. With our 5 factories based in Ningbo & Zhoushan, including our second factory Ningbo Lichao Tiebar Precision Machinery Co., Ltd. who is specialized in manufacturing Tie bars, Pistons rods, Nuts, we commit to designing and supplying precision parts for the plastics, rubber, food and medical industries, ect.


Focusing on Precise Machining, Ningbo Jinyi has an extremely large database of prints, drawings, and factory OEM specifications. While paying attention to skilled personnel training, we also imported series of advanced equipment, such as CNC Machining Center, CNC Turning Machine, Inner Hole Grinding Machine, 13 Meters Deep Hole Boring Machine, NC drilling machine, Nitriding Furnace Computer Control System, Centrifugal Casting Furnace, PTA Bimetallic Spraying Equipment, gear milling machine and so on .


At the same time, Ningbo Jinyi continues to improve Quality Control System through precise inspection during every step of the production. With our excellent quality, we have already established long term cooperation with many well-known companies both in China and overseas. We are one of the first companies to implement the ISO9001 & SGS Certification in our industry.


Development History

1993 The company "Lichao" was established with the rise of screw industry in Chin.

1995 Took the lead in introducing CNC machining in the industry.

1997 We firstly started to manufacture alloy bushing barrel, which greatly improved the service life of barrel.

2000 The annual output exceeded RMB 50 million yuan for the first time.

2002 In order to better serve customers, the main plant was relocated to Ningbo.

2003 Jinyi recruited technical talents from Taiwan Province to guide and study alloy casting process.

2005 The centrifugal casting equipment was introduced from Taiwan and put into use.

2007 PTA plasma automatic bimetallic alloy spraying equipment was installed and put into use.

2010 Zhoushan new plant was built.

2011 A new electroplating plant was built in Zhenhai Chemical Industrial Park. So far, all the production processes of Jinyi can be under internal control.

2012 The second factory in Ningbo was built.

2016 The third factory in Ningbo was built, forming a pattern of 2 bases and 5 factory areas in Ningbo and Zhoushan.

2017 "Ningbo Lichao Tie Bar Precision Machinery Co., Ltd." was established, mainly engaged in tiebars manufacturing.


Company Info
  • Company Name: Ningbo Jinyi Precision Machinery Co., Ltd.
  • Representative: ZHANG LIBO
  • Product/Service: Injection Screws , Injection Barrels , Extrusion Screws , Extrusion Barrels , Tie Bars , Twin Screw Barrels
  • Capital (Million US $): 30 millions
  • Year Established: 2003
  • Total Annual Sales Volume (Million US $): US$10 Million - US$50 Million
  • Export Percentage: 21% - 30%
  • Total Annual Purchase Volume (Million US $): US$10 Million - US$50 Million
  • No. of Production Lines: 12
  • No. of R&D Staff: 11 -20 People
  • No. of QC Staff: 21 -30 People
  • OEM Services Provided: yes
  • Factory Size (Sq.meters): Above 100,000 square meters
  • Factory Location: 158 Qiancheng Rd, Zhenhai District
  • Contact Person: Mr. Kenny Ye
  • Tel: +86-574-55002386
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