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Extrusion method and apparatus

An extruder and matrix technology, applied in the field of extrusion technology and material extrusion, can solve problems such as short production runs, difficult control of extruder material throughput and material temperature, and weakening of extruder programming operations. To achieve the effect of improving temperature control

Active Publication Date: 2017-03-01
ZEPHYROS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although such extruders are useful, there are difficulties in their use due to the fact that the amount of material handled and the temperature of the material in the extruder are difficult to control, possibly due to premature reaction of the material leading to sticking on the extruder. The reason in the output
This can lead to irregularities in the size and thickness of the extrudate and can impair programmed operation of the extruder
All of this results in undesirably short production runs due to the frequent shutdowns required for cleaning

Method used

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  • Extrusion method and apparatus
  • Extrusion method and apparatus
  • Extrusion method and apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0032] figure 1 is a cross-sectional view of an extruder according to the invention, showing the extruder barrel (1 ) divided into four zones (2), (3), (4) and (5). The extruder screw is indicated as (6) and the extruder die is indicated as (7). (8) is the feed hopper, (9) is the motor that drives the screw conveyor of the extruder.

[0033] Zone (1) is the zone for cooling, heaters are provided in zones (2), (3) and (4) to gradually increase the temperature along the barrel, lines (10) and (11) represent the Slots in the initial cooling section of the barrel.

[0034] figure 2 is a graph of a typical temperature profile along the extruder barrel. The X-axis is the distance along the barrel and the Y-axis is the temperature of the material.

[0035] exist image 3 Among them, Q is the flow rate of the material in the extruder, and RPM is the speed of the screw conveyor of the extruder. Two curves are provided for comparison, showing the effect of the groove.

[0036] ...

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Abstract

Improvements in the extrusion of heat hardenable materials are achieved by cooling the material in the initial zone (2) of the extruder (1) and by using a prescribed ratio of length to diameter and screw conveyor speed to reduce dwell Time; especially suitable for intermittent application in robot-controlled mass production.

Description

technical field [0001] The present invention relates to related improvements in methods and apparatus for extrusion. In particular, the present invention relates to the extrusion of relatively low melting temperature materials, especially heat activatable materials, eg materials that can be heat hardened and / or foamed at temperatures above the extrusion temperature. The invention also relates to extrusion techniques involving precise and intermittent extrusion of material, usually as thin strips of material, in which a regular flow of the extrudate is important. In one embodiment, the present invention provides a compact and easily transportable mini-extruder that can be controlled robotically. Background technique [0002] Extrusion of heat-activatable materials with low melting points presents particular difficulties due, for example, to premature melting and / or reaction of the material as it is fed to the extruder and / or in the initial region of the extruder barrel. Mat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C47/00B29C47/58B29K105/04B29K101/10B29K105/00B29K105/24B29C47/66B29C47/08B29C47/82B29C35/02B29C44/34B29C48/07B29C48/155B29C48/395B29C48/50B29C48/625B29C48/79B29C48/875
CPCB29C44/3484B29K2101/10B29K2105/0097B29K2105/04B29K2105/246B29K2995/0002B29C44/50B29C48/875B29C48/865B29C48/288B29C2948/92704B29C2948/92876B29C48/022B29C48/07B29C48/155B29C48/266B29C48/2694B29C48/395B29C48/501B29C48/625B29C48/686B29C48/79B29C48/832B29C48/834B29C2948/92561B29C2948/9259B29C2948/92809B29C2948/92885B29C2948/92904B29C2948/92971B05D5/00
Inventor V·霍夫C·埃普
Owner ZEPHYROS INC