China Plastic Compounding Twin Screw Barrel manufacturers and suppliers

Product Description

plastic compounding twin screw barrel

Plastic compounding twin screw barrel are widely used for compounding industry.

Each year, EJS produces large volume of plastic compounding twin screw barrel for domestic and global markets.

EJS is a professional manufacturer of parallel twin screw barrel for years, with customers of OEM machine builders as well as end users.

Popular Materials used for plastic compounding twin screw barrel

38CrMoAlA (DIN1.8509)

W6Mo5Cr4V2

D2 (DIN 1.2379)

SKD61

SS316

SS304

Surface Treatment of plastic compounding twin screw barrel

Full body nitrided

Bimetallic carbide liner for twin parallel barrels

Bimetallic alloy coating for twin parallel screws

SKD61 lining

To know more about compounding extruders, please continue reading:

( https://www.mddionline.com/news/mix-continuous-compounding-using-twin-screw-extruders)

Polymer compounds are used for an extremely wide range of molded and extruded medical components and devices. Such compounds are composed of a base resin that is thoroughly mixed with other components that provide specific beneficial properties relating to the particular end product—for example, impact resistance, clarity, or radiopacity.

Compounding extruders are used to mix together two or more materials into a homogeneous mass in a continuous process. This is accomplished through distributive and dispersive mixing of the various components in the compound as required (Figure 1). In distributive mixing, the components are uniformly distributed in space in a uniform ratio without being broken down, whereas dispersive mixing involves the breaking down of agglomerates. High-dispersive mixing requires that significant energy and shear be part of the process.

Compounding extruders perform a number of basic functions: feeding, melting, mixing, venting, and developing die and localized pressure. Various types of extruders can be used to accomplish these goals, including single screw, counterrotating intermeshing twin screw, corotating intermeshing twin screw, and counterrotating nonintermeshing twin screw. The type and physical form of the polymer materials, the properties of any additives or fillers, and the degree of mixing required will have a bearing on machine selection.

Twin-screw compounding devices are primarily dedicated to transferring heat and mechanical energy to provide mixing and various support functions, with minimal regard for pumping. Various operations performed via this type of extruder include the polymerizing of new polymers, modifying polymers via graft reactions, devolatilizing, blending different polymers, and compounding particulates into plastics. By contrast, single-screw plasticating extruders are designed to minimize energy input and to maximize pumping uniformity, and are generally inadequate to perform highly dispersive and energy-intensive compounding functions.

About E.J.S.

EJS Screw Barrels is a newly created brand name for Export business with manufacturing experiences since 1992.
A screw barrel manufacturer dedicated on producing customized screw barrel and design extruder screw barrels, injection moulding screw barrels.

Bimetallic Screw Barrels

We started to make bimetallic screw barrel at a very early age, almost the same time as the first bimetallic barrel was born in China. Now we have several types for options depending on different applications

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~250℃	11.0x10-6	11.0x10-6	11.5x10-6	11.0x10-6
Expansion(/℃)	RT~400℃	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	CoImonoy 56	CoImonoy 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	38CrMoAI(1.8509), 34CrAINi7(1.8550), 31CrMoV9(1.8519)
Mark in the list: ★★★★ Excellent; ★★★ Very Good; ★★Good

Quality Inspection

Quality is a very important step during production. For making a quality screw barrel, all tolerances should be fulfilled and all dimensions should be correct and put in records.

We provide inspection report, material certificate for every of our supplied screw barrels.

Packaging

Packaging is the last but very important step before shipping. A strong and smart packing box is also part of our quality. It is not only used to protect the screws barrels well during transportation, also provide an easy way for our customer to unpack.