1.About E.J.S.
Founded in 1992, our factory grew out from a small workshop of conical twin screw barrel production. Thanks to all dedicated employees and loyal customers, our factory is now running by 400 full-time employees with 21 workshops covered in an area of 40 000m2, with a range of screw barrels are produced including Extruder Screw Barrel, Injection Moulding Screw Barrel, Rubber Screw Barrel, Twin Screw Barrel and Extruder Parts.
From the very beginning of establishment, E.J.S is designed to produce high quality screw barrel, by using Top-Class steel 38CrMoAla, 40Cr, 42CrMo which are most popular for Chinese Market. For processing various application and meeting different needs from customers all over the world, nowadays we have more steels for option, 1.8550(34CrAlNi7), 1.8519(31CrMoV9), D2, Hastelloy, SKD61, SKD11 etc. We believe good raw material is the grounding and footstone to make a good job.
Details matter, this is especially true for screw barrels. The precision and accuracy of product dimensions separate one factory from another.
JinTang Island, where our factory is located, also called " Island of Screws", has hundreds of companies making screws and barrels, small and big, old and new, with about 30000 people working in this business. If you want to cheaper prices, keep asking.
If quality is critical, you have much less options unfortunately. The rule" Every penny counts" works great here.
If quality is your top priority, E.J.S is your great option.
Most of our screws and barrels are produced for other brands of extruder machines and injection molding machines, you will not know it is from us.
E.J.S is a leading Chinese Screw Barrel Manufacturer because:
1) Our prices are very competitive because of structured production and all our products are made in China.
2) E.J.S is a screw barrel manufacturer with full range of extruder parts such as Twin Screw Extruder Screw Barrel, Injection Moulding Machine Screw Barrel, Blown Moulding Machine Screw Barrel, Rubber Screw barrel, Moulds, Gear box, Die, Flange, Nozzle, Rolls screw elements, planetary roller screw, bimetallic screw barrel, conical screw, conical barrel, parallel twin cylinder, and much more.
3) The engineers from E.J.S are highly educated and skilled technicians working together with us for many years, who love the screw barrel challenges.
4) We have technical guys with experience who can travel around to do on-site measurement at your factory when you don't have a drawing;
5) Our quality control department has the highest standard in quality control based on international standards.
6) The E.J.S sales team has the highest level of English communication and has been trained in screw barrel every day.
7) This offers you, our customer, the highest quality level in Chinese screw barrel.
8) There is always an invitation to you for visiting our office in Ningbo and factory in JinTang, come and see for yourself what we are doing!
9) We guarantee our products and our service are the best you can find.
If you are working in plastic & rubber industry, and do need a business partner on screws barrels, come to us. With our knowledge and experiences on producing, with our attitude on quality controlling, with a team always standing behind their products, E.J.S have been and will always provide you highest level of customers satisfaction.
2. Product Details
1) Base materials
Our common materials include 42CrMo(4140Steel), 38CrMoAlA(1.8509), 31CrMoV9(1.8519), 34CrAlNi7(1.8550), 40Cr, 45Steel,
SS304, SS416, SKD11, SKD61,. Other materials are possible, please contact us for further details.
2) Surface treatments
Including: quenching & tempering, nitriding, hard chrome-plated, bimetallic alloy coating, through hardened.
| Bimetallic Barrels |
| Alloy Type |
EJS01 Alloy |
EJS02 Alloy |
EJS03 Alloy |
EJS04 Alloy |
| Alloy Components |
Fe+Ni+Cr+B
(Fe:65, Ni:14, Cr8, B:3.5) |
Ni+Cr+Co+B |
Ni+Cr+Co+V+B |
Ni+Wc+Cr+B
(Ni:50, Wc:15~35,Cr:6~8, B:2.5~3.2) |
| Wearing Resistance |
★★★ |
★★ |
★★★ |
★★★★ |
| Corrosion Resistance |
★★ |
★★★ |
★★★ |
★★★ |
| Alloy Thickness |
2-3mm |
1.5~2mm |
1.5~2mm |
1.5~2mm |
| Hardness |
HRC 58~65 |
HRC 50~58 |
HRC 55~60 |
HRC 55~65 |
| Temperature Range |
≤400 |
≤450 |
≤450 |
≤600 |
| Coefficient Thermal |
RT~250ºC |
11.0x10-6 |
11.0x10-6 |
11.5x10-6 |
11.0x10-6 |
| Expansion(/ºC) |
RT~400ºC |
11.4x10-6 |
11.4x10-6 |
12.4x10-6 |
12x10-6 |
| Range of Workable Length |
700mm~3000mm/piece |
| Base Steel Vastly Used |
40Cr, 42CrMo |
| Mark in the list: ★★★★ Excellent; ★★★ Very Good; ★★Good |
| Bimetallic Screws |
| Suitable for |
Single Screw, Twin Parallel Screw, Twin Conical Screw |
| Alloy Type |
Ni60 |
Colmonoy 56 |
Colmonoy 83 |
| Alloy Components |
Ni+Cr+Fe+Si
(Ni:65, Cr:17, Fe:15, Si:5) |
Ni+Cr+Si+Fe
(Ni: 68, Cr:18, Si:5, Fe:5) |
Ni+Wc+Cr+C
(Ni:40, Wc:34, Cr:20, C:2) |
| Anti-Wearing Level |
★★★ |
★★★ |
★★★★ |
| Anti-Corrosion Level |
★★★★ |
★★★★ |
★★★★ |
| Alloy Thickness |
1~1.5mm |
1~1.5mm |
1~1.5mm |
| Hardness |
HRC 56~62 |
HRC 46~61 |
HRC 43~48 |
| Applied Glass Fiber |
Under 10% |
|
|
| Range of Workable Length |
Any length needed |
| Base Steel Vastly Used |
38CrMoAl(1.8509), 34CrAlNi7(1.8550), 31CrMoV9(1.8519) |
| Mark in the list: ★★★★ Excellent; ★★★ Very Good; ★★Good |
3. E.J.S Workshop
4. EJS Bimetallic Machine
1) New PTA welding mahine for screws:
2) Centrifugal casting machine for barrels
5. Quality Inspection
We take only first-class steel and check every production procedure to ensure every dimension is produced precisely. A final complete inspection will be executed before dispatch.
6. Packaging
We use strong plywood or wooden case for all our products
7. Our Advantages
1) Quality always comes first. Our experienced workers pay attention to every tiny procedure during the production and inspection, to ensure the precision of every dimension.
2) Service makes us outstanding. Our sales people are trained on the products every day. They are always ready to answer your questions and offer the best solutions in fluent English at any time.
3) Provide an easier working way. With 6 years export experience, we E.J.S offer before-sales, prouction update, after-sales one stop service, which gives all our customers an easier way to work with us. We welcome you to visit our factory at any time.
8. Our market
Through years of developing, we have happy customers all over the world with main market in Europe, South America, Asia, Middle East, ect.
We look forward to working with you now and forever!
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