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Melting performance of single screw extruders with a grooved melting zone

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Abstract

A novel melting model for single screw extruders with a grooved melting zone was established. The whole solid plug, which came from the grooved feed zone, was ruptured and melted mainly by continuously changing the volume of the barrel grooves and the screw channel in the grooved melting zone. A new single screw extruder platform with hydraulic clamshell barrels was constructed to investigate the melting of solid polymer with different combinations of barrels and screws. The melting model was verified by experiments. The results showed that the melting started earlier and finished in a shorter length for single screw extruders with a grooved melting zone than that for conventional single screw extruders and the melting efficiency was improved by introducing a grooved melting zone to a single screw extruder. The theoretical values are consistent with experimental results. The novel single screw extruder with grooved melting zone can dramatically increase the plasticizing efficiency and the throughput.

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Abbreviations

Symbol :

Parameter (Values)

μi :

Internal friction coefficient of material (0.37)

μo :

External friction coefficient of material (0.19)

τ screw :

Interfacial shear forces on the outer surface of the screw (N)

τ barrel :

Interfacial shear forces on the inner surface of the barrel (N)

τ σc :

Material shearing resistance (N)

F fi :

Friction force (N)

L c :

Melting length in the barrel groove (m)

L s :

Melting length in the screw channel (m)

P 1end :

pressure at the end of the feed zone (Pa)

Vs :

Circumferential velocity of barrel. (m/s)

c :

Specific heat coefficient (2400 J/kg·°C)

h :

Melt film thickness (m)

l m :

The melt starting point (m)

l s :

Melt starting point in the screw channel (m)

l c :

Melt starting point in the barrel groove (m)

k :

Thermal conductivity (W/m·°C)

q :

Friction heat (W/m2)

v c :

Velocity of the solid-plug along the axis Y. (m/s)

φ c :

Barrel groove helical angle (o)

φ s :

Screw channel helical angle (o)

λ :

Melting latent heat (1.3 × 105 J/kg)

ρ s :

Material solid density (485 kg/m3)

ρ m :

Material melt density (920 kg/m3)

σ c :

Material shear strength (5.8 × 106 Pa)

η :

Viscosity (Pa·s)

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Acknowledgements

The authors would like to acknowledge the support of the National Natural Science Foundation of China (Grant No. 21404007).

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Authors and Affiliations

  1. Institute of Plastic Machinery and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China

    Xiaoming Jin, Ping Xue, Ke Chen & Mingyin Jia

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  1. Xiaoming Jin
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  2. Ping Xue
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  3. Ke Chen
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  4. Mingyin Jia
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Correspondence to Mingyin Jia.

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Jin, X., Xue, P., Chen, K. et al. Melting performance of single screw extruders with a grooved melting zone. J Polym Res 25, 149 (2018). https://doi.org/10.1007/s10965-018-1544-0

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