Divergence and convergence screw
A screw and diverging zone technology, applied in the field of screw extruder components, can solve the problems of low plasticizing capacity, easy decomposition of materials, and insufficient shear force in the melting section of the screw to meet the requirements, so as to prevent the temperature of the material from becoming high and enhance the plasticity. The effect of the ability to
Pending Publication Date: 2017-04-26
WUXI NANFANG ELECTROTECHN MACHINERY
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Problems solved by technology
[0005] In actual use, it is found that due to the shallow groove of the screw metering section, the melt temperature of the screw increases at high speed, and the material is easy to decompose.
In addition, the shear force in the melting section of the screw cannot meet the demand, and the plasticizing capacity is low
Method used
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[0016] Specific embodiments of the present invention are described in detail below, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.
[0017] Unless expressly stated otherwise, throughout the specification and claims, the term "comprise" or variations thereof such as "includes" or "includes" and the like will be understood to include the stated elements or constituents, and not Other elements or other components are not excluded.
[0018] Such as figure 1 As shown, a diverging and converging screw includes a feeding section 1, a melting section 2, and a metering section 3; the feeding section 1 is an equal-depth and equidistant area for compacting materials; the melting section 2 includes a diverging section 4, Shear zone 5; the thread lead of the diverging zone 4 gradually becomes larger and the depth of the screw groove gradually becomes shallower, that is, unequal distances and different depths. When...
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The invention discloses a divergence and convergence screw which comprises a feeding section, a melting section and a metering section. The feeding section is an equal-depth and equal-distance area and is used for compacting materials. The melting section comprises a divergence area and a shearing area. The thread lead of the divergence area is gradually large, the screw channel depth of the divergence area is gradually small, in other words, the divergence area is not equal in distance and not equal in depth. When the compression ratio of the melting section of the screw is certain, the screw channel depth is smaller, shearing force on materials is enhanced, and the materials are dispersed in large area in the divergence area and are completely plasticized in a shear area. The metering section comprises a convergence area and an equal-depth and equal-distance area, the thread lead of the convergence area is gradually small, the thread channel depth is gradually large, the thread channel volume of the convergence area is gradually small to increase extrusion pressure, and the materials are discharged out from the equal-depth and equal-distance area. The divergence and convergence screw has the beneficial effects that the conveying power is high, the plasticizing capability is high, and the phenomenon that the materials are decomposed under the high rotating speed of the screw is prevented.
Description
[0001] Technical field: [0002] The invention belongs to the technical field of screw extruder components, in particular to a diverging and converging screw. [0003] Background technique: [0004] The screw is the core component of the extruder, known as the "heart" of the extruder. In order to improve the performance of the extruder, people have made many improvements from the earliest common screw for a long time, and various new types of screw have appeared. Screws, such as BM screw, pin screw, wave screw, mixing screw and so on. [0005] In actual use, it is found that due to the shallow screw groove in the metering section of the screw, the melt temperature of the screw increases at high speed, and the material is easy to decompose. In addition, the shear force in the melting section of the screw cannot meet the demand, and the plasticizing capacity is low. [0006] The information disclosed in this Background section is only for enhancing the understanding of the gene...
Claims
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Login to View More IPC IPC(8): B29C47/60
CPCB29C48/53
Inventor 朱文斌蒋振华
Owner WUXI NANFANG ELECTROTECHN MACHINERY