Transparent Granulation Single Screw

The Transparent Granulation Single Screw has extremely strict requirements for the surface quality of the products. Any blemishes, pores, whitening, star marks, black spots, color changes, poor luster, etc. are not allowed. The transparent granulation-specific single screw produced by Nanhaiya can maximize uniform plasticization, ensuring that the material is perfectly plasticized during the plasticization stage and achieving the highest purity.

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Product Description

Product Parameters

Parameter	Details
Screw Diameter	Common specifications include 35mm, 45mm, 65mm, 75mm, 85mm, 90mm, etc. For instance, when processing PVC pipes, a 65mm screw is widely used as it achieves a good balance between output and energy consumption.
Length-to-Diameter Ratio (L/D Ratio)	Generally ranges from 20:1 to 30:1. For heat-sensitive plastics like PVC, the L/D ratio is usually between 20:1 and 25:1. This ensures sufficient plasticization while reducing the residence time of materials in the barrel to lower the risk of decomposition.
Compression Ratio	Typically falls between 3.5:1 and 4.5:1. A larger compression ratio facilitates full plasticization and compaction of PVC materials.
Screw Channel Depth	The screw channel is relatively shallow, especially in the metering section. This design reduces the residence time of materials and minimizes the possibility of decomposition.
Number of Heating and Cooling Zones	Varies based on screw diameter and equipment specifications, usually ranging from 5 to 6 zones. For example, a single-screw extruder with a 65mm screw diameter may have 6 heating and cooling zones to enable precise temperature control in each segment.
Screw Speed	The speed range needs to be adjusted according to the specific screw diameter and production requirements. For a φ65mm screw, when producing pipes with a 3mm wall thickness, the recommended speed is controlled within the range of 25-35rpm.
Drive Power	Related to screw diameter and output. For example, a single-screw extruder with a 65mm screw diameter typically has a drive power of 45-90kw.
Operating Temperature	The temperature of the feeding section is generally 160-170℃, the melting section is 180-190℃, and the die head section is 175-185℃.

Product Feature And Application

1. Single screw surface, with special nitriding treatment. While maintaining high hardness, a surface layer with greater density and smoother texture can be achieved compared to gas nitriding.

2. Single screw barrel for transparent granulation, High-quality nitrided steel 38CrMoAlA, after deep ion nitriding treatment, ensures the toughness of the core and the hardness of the surface.

3. The surface of the screw is highly hard, highly smooth, and highly straight. It can effectively ensure the plasticization of transparent materials.

4. The screw head of the single screw is smooth in the transition area, with no dead corners. The grooves and threads are uninterrupted, preventing cross-contamination during material replacement and color change.

Production Details

1. Based on the properties of the transparent material, a medium or relatively low compression ratio of single screw is designed, usually ranging from 2.0:1 to 2.5:1.

2. Transparent granulation single screw with longer LD ratio,Achieve complete plasticization under lower rotational speeds and milder shear forces

3. The non-redundant, highly efficient single-screw design of the mixing components ensures extremely uniform distribution of PS materials.

4. The single screw is electroplated with hard chromium on its surface. The surface of the screw is extremely smooth and hard, with excellent anti-adhesion properties and corrosion resistance.

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Contact Info

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Address

Block C,No.2 West Section,Xingzhou Avenue,Dinghai District ,Zhoushan City,Zhejiang Province
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Tel

+86-13505809642
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E-mail

info@nhyscrew.com