Bimetallic / Nitrided Conical Twin Extruder Screws And Barrels For WPC PVC PE Industry

Eextruder Screws:Bimetallic Nitrided Conical Twin Screws For WPC PVC PE Industry/ Extruder Screws And Barrels

1.Product Introduction

Conical twin-screw extruder is composed of barrel, screw ,gear transimission system,measurable feeding,vacuum system,heating,cooling and electronic control components.

It is mainly used in plasticizing,extruding and forming PVC pipe ,plate,sheet,film,profile,and granule,etc

2.Main Advantages

1– Low shearing rate, uneasy degradation,plasticization uniform and agglomeration.

2– Reliable quality ,wide application range and long servicing life.

3– Automatic temperature control, vacuum gas exhaustion, oil cooled screws.

4— forced feeding and self-cleaning mechanism.

3.Main Specification

4.Bimetallic Conical Screw Parameter

Basic Steel: 38CrMoAIA

Heat treatment hardness: HB260°~320°

Nitriding hardness:HV950°~1000°

Nitriding depth: 0.50~ 0.7mm

Nitriding brittleness:≤ grade 2

Roughness:Ra0.4

Screw straightness:0.015mm

Chrome plating hardness:≥950HV

Chrome thickness: 0.05～0.10mm

Bimetal depth: 1.0～2.0mm

Bimetal hardness:HRC56°~65°

5.Bimetallic Special Materials

hot processed steel: 1.2344,H13,W360,SKD61,

cold processed steel: 1.2379,K340,D2,DC53,SKD11,W110

HSS:1.3343,1.3243, SKH51,SKH55,

HIP Powder HSS:CPM9V,SK739,SK726,SK742,GH113

Screw flight top use Stellite plasma alloy welding, alloy types: cobalt base,nickel base, iron base alloy.

We use special alloy powders being sprayed and welded on the screw’s ridge,
and we use different alloy and welding methods for the screw of different functions.

6.Production Show

7.QualityControl

We always adhere to the principle of quality first and service first, and strictly control the quality of every product that leaves the factory to ensure the interests of customers to the greatest extent possibly.

8.Other Similar Products We Can Offer

Extruder screws:Single screw extruders’ screws and cylinders: with diameter 15-940mm; Length-diameter ratio 1:8-1:60

Injection molding machines’ screws and cylinders: 15G-25000G series

Twin-screw extruders’screws and cylinders:diameter 25-200mm

Single screw categories: screen type, separated type, exhausting type, dowel type, double-end type, pelleting type, and chemical fiber screws.

Twin screw categories: ordinary type, cone type, hypercone type, and pelleting type.
 

9.Export Experience
Our main business is foreign trade, and currently we have served over 30 customers in over 10 countries. With excellent products, strict quality control, and first-class service, we are having more and more high-quality customers now.
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An extruder screw is a critical component used in extrusion machines. Extrusion machines are common plastic processing equipment used to melt solid plastic and extrude it into continuous products of desired shapes, such as plastic pipes, sheets, and films.

Extruder screws are typically made of metal and serve the main function of conveying solid plastic pellets from the feed hopper into the barrel and melting them through heating and shearing actions. The screw usually consists of different sections, including the melting zone, metering zone, and compression zone, to ensure uniform melting of the plastic material and achieve the desired extrusion pressure.

The design and parameters of the screw vary depending on the type, shape, and processing conditions of the material to be extruded. For example, for high-viscosity plastic materials, the screw may have larger mixing zones to increase shearing action, while for plastics requiring color or filler additives, the screw may be equipped with corresponding blending devices.

In summary, the extruder screws plays a crucial role in the plastic processing process, directly impacting the quality and production efficiency of extruded products.
 

what are extruder screws made of

Extruder screws, also known as screw elements or augers, are typically made from a variety of materials depending on the specific application and requirements. Some common materials used for extruder screws include:

1. Tool Steel: High-grade tool steels such as H13 or D2 are commonly used for their excellent wear resistance and toughness. These steels can withstand high temperatures and provide long-term durability.
2. Stainless Steel: Stainless steel screws are suitable for applications that require corrosion resistance. They offer good strength and thermal stability, making them suitable for food processing, pharmaceuticals, and other industries where cleanliness is important.
3. Nitrided Steel: Nitriding involves diffusing nitrogen into the surface layer of steel to create a hard, wear-resistant case. Nitrided screws offer improved performance in terms of wear resistance and reduced frictional heat.
4. Bimetallic Screws: These screws have a construction consisting of two different materials. For example, the core of the screw may be made from carbon steel while the outer surface is made from a wear-resistant alloy like tungsten carbide. This combination provides both strength and wear resistance.

Specialized Alloys: In some cases, specialized alloys like nickel-based superalloys or cobalt-based alloys (such as Stellite) may be used for extruder screws operating under extreme conditions, such as high temperatures or aggressive environments.

The design of extruder screws depends on various factors such as the material being extruded, desired output, and processing conditions.

Some common screw designs used in extruders include:

1 . Single Flighted: This design consists of a single helical flight that runs the entire length of the screw. It is suitable for materials that have good melting and conveying properties.

2 . Double Flighted: In this design, two helical flights wrap around the screw shaft. It provides better mixing and conveying capabilities, making it suitable for materials that require improved homogeneity.

3 . Barrier: Barrier screws feature a section with interrupted flights or mixing pins. This design enhances mixing and pressure generation, enabling better control over the melt temperature and residence time.

4 . Grooved Feed: This design includes grooves or notches on the feed section of the screw. It improves the feeding and compression of materials with poor flow characteristics.

5 . Maddock Mixing: Maddock mixing screws have special mixing elements that enhance material blending and dispersion. They are commonly used when thorough mixing is required.