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Plastic extruding machine with curve-shaped machine neck flow channel

A curved and extruder technology, applied in the field of cable production, can solve problems such as uneven temperature, slow flow rate of polymer melt, and easy to produce dead edges on the flow channel wall.

Active Publication Date: 2013-03-20
江苏海达电缆有限公司
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  • Description
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  • Application Information

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Problems solved by technology

Therefore, in actual operation, the existing linear trumpet-shaped flow channel structure has a large cavity volume, a slow flow rate of the extruded polymer melt, especially a small edge pressure, uneven temperature of each layer, and dead edges on the flow channel wall. , there will be defects such as dead blocks or dead coke decomposition products in the melt

Method used

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  • Plastic extruding machine with curve-shaped machine neck flow channel
  • Plastic extruding machine with curve-shaped machine neck flow channel

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Embodiment Construction

[0013] Such as figure 2 , The extruder of the present invention has a curved neck runner, the longitudinal cross-sectional shape of the neck runner is curved, and the curve is:

[0014] (1) The neck runner adopts y=ax 2 function.

[0015] (2) The constant a is determined by the diameter of the screw barrel of the fuselage and the aperture of the nose inflow, specifically a= (Note: R Is the arc radius of the horn; D Large diameter of the horn, that is, the inner diameter of the body barrel; d It is the small diameter of the horn, that is, the diameter of the hole that flows into the nose).

[0016] (3) The flared edge is round and smooth (circular radius R ), take the circumference , No dead ends.

[0017] (4) The starting point to the end point of the entire trumpet curve is accurately positioned, and there is no dead point in surface processing.

[0018] The present invention provides an idea and implementation method for an extruder with a curvilinear neck runner. There are ma...

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Abstract

The invention discloses a plastic extruding machine with a curve-shaped machine neck flow channel. The plastic extruding machine is provided with the machine neck flow channel, wherein the longitudinal cross section of the machine neck flow channel is curve-shaped; a curve formula is that y=ax<2>; a=D-d / 2-R; R is the radius of a circular arc on the edge of a horn; D is the large caliber of the horn, namely the inner diameter of a spiral barrel of a machine body; and d is the small caliber of the horn, namely the diameter of a hole in an inflow machine head. Due to reasonable setting of the shape of the machine neck flow channel, the machine neck flow channel is matched with the flow characteristics of a plastic melt in a smelting state, so that an extruded high polymer melt in the flowing process applies uniform pressure to each bedding surface, and has increased flow velocity and a uniform temperature; and dead angles do not exist in the curve-shaped flow channel, and the defects of rigid blocks and the like on an extrusion cladding layer can be overcome.

Description

Technical field [0001] The invention relates to the field of cable production, in particular to an extruder, particularly an extruder with a curved machine neck runner. Background technique [0002] The extruder is mainly composed of an extrusion system, a transmission system and a heating and cooling system. The extrusion system includes screw, barrel, hopper, head and die. The plastic is cut into a uniform melt through the extrusion system, and is continuously extruded by the screw under the pressure established in the process. Nose. [0003] The machine head is composed of an alloy steel inner sleeve and a carbon steel outer sleeve. The machine head is equipped with a forming mold. The function of the machine head is to transform the rotating plastic melt into parallel linear motion, and introduce it into the mold sleeve evenly and stably, and give the plastic With the necessary molding pressure, the plastic is plasticized and compacted in the barrel, and flows into the mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C47/12B29C48/30
Inventor 吕松林王晓华张黎辉张宣东谢叶彬朱华波
Owner 江苏海达电缆有限公司
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