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On-line quality measurement device for plastic product on extruder

A product quality and measuring device technology, applied in the field of on-line measuring devices for plastic product quality on extruders, can solve problems such as limited information, lagging real-time production control, economic losses, etc., achieve accurate control parameters, ensure processing quality, reduce The effect of scrap rate

Active Publication Date: 2012-07-25
GUANGZHOU HKUST FOK YING TUNG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although these measurement methods can obtain product quality results, if a problematic product is detected, the information that needs to be fed back to adjust production parameters based on these problems is already several hours later, which is far behind the control of real-time production At this time, it has already led to the waste of tons of products and caused considerable economic losses.
[0004] The current online measurement methods of the extrusion production line mainly include the online measurement of the temperature in the barrel and the pressure in the barrel. However, these cannot directly reflect the final quality of the product, and the amount of information provided is extremely limited.
For example, the Chinese patent "Method and device for measuring the temperature of plasticized plastic at the outlet of the extruder" with application number 200910206586.6 discloses a method of measuring the temperature of the plastic by using the propagation velocity of the medium sound wave of the material to be extruded method and device, but only limited to online temperature or pressure testing, and cannot measure quality parameters such as thickness uniformity, density consistency, mixing uniformity, or cooling crystallization uniformity that reflect the quality of plastic products, so that they cannot directly reflect the final quality of plastic products. quality

Method used

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  • On-line quality measurement device for plastic product on extruder
  • On-line quality measurement device for plastic product on extruder
  • On-line quality measurement device for plastic product on extruder

Examples

Experimental program
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Effect test

Embodiment 1

[0025] In embodiment one, the number of plate capacitors 10 is one, refer to image 3 , the two electrodes 11 of the flat plate capacitor 10 are radially fixed on both symmetrical sides of the exit 41 of the extrusion head on the extruder through an insulating material.

[0026] When the extrusion process did not take place, the dielectric layer between the two electrodes 11 of the flat capacitor 10 was air 11, and the capacitance value of the flat capacitor 10 was C 0 , , where ε 0 is the dielectric constant of the medium between the electrodes, S is the relative area of ​​the two electrodes, and D is the relative distance between the two electrodes. Changing any one of these 3 parameters will change the capacitance value of the plate capacitor.

[0027] When the extrusion process takes place, once the extruded material passes through the flat capacitor 10 after coming out of the extrusion head 43, since the dielectric layer between the two electrodes 11 of the flat capac...

Embodiment 2

[0033] In embodiment two, the number of plate capacitors 10 is two, refer to Figure 4 , the two electrodes of one of the flat capacitors are radially fixed on the symmetrical sides of the extrusion head exit 41 on the extruder through insulating materials, and the two electrodes of the other flat capacitor are fixed radially on the extruder through insulating materials Symmetrical both sides of the outlet 42 of the cooling water tank.

[0034] Similarly, during the extrusion process, the formula for calculating the capacitance values ​​of the two flat capacitors in this embodiment is applicable to formula 1, namely .

[0035] When the extrusion material comes out of the extrusion head 43 and passes through the plate capacitor 10 at the exit 41 of the extrusion head, the capacitance measuring unit 20 can measure whether the heating and extrusion process of the extruded product in the barrel is uniform;

[0036] When the extruded material passes through the cooling water tank ...

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Abstract

The invention discloses an on-line quality measurement device for a plastic product on an extruder. The quality on-line measurement device comprises a plate condenser used for measuring quality parameters of an extrusion material on the extruder, wherein the two electrodes of the plate condenser are positioned at the two sides of the extrusion material, and one lead is led out from each of the electrode of the plate condenser and is connected with a capacitance measurement unit. The on-line quality measurement device for the plastic product on the extruder provided by the invention adopts the principle that the change of capacitance value reflects the change of a dielectric constant between the two electrodes of the condenser and evaluates the plastic product quality through the change of the capacitance value of the extrusion material on the extruder, and the measurement device is simple in structure and can monitor the quality parameters of thickness uniformity, density consistency, mixing uniformity, cooling crystallization uniformity and the like of an extrusion product on line in a real-time manner, so as to provide reliable control parameters for the machining process timely and accurately, ensure the machining quality of the product, lower the rejection rate and save cost.

Description

technical field [0001] The invention relates to an extruder device for plastic products, in particular to an online quality measuring device for plastic products on the extruder. Background technique [0002] The extruder is a device used to process polymer plastic products. The extrusion process refers to the plasticization of polymer (plastic) particles into a uniform melt through the extrusion system in the barrel, and the pressure established during this process Next, the process of being continuously extruded by the screw head, the extrusion process includes steps such as feeding, melt plasticization, and screw extrusion. Although this process lasts for a short period of time, the state of the melt in the extruder changes greatly. These variations have a decisive influence on the quality of the final product. [0003] In recent years, the quality requirements of plastic products have been increasing, and faster and more reliable online measurement and control methods a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/92B29C48/92
CPCB29C48/92B29C2948/92152B29C2948/9219B29C2948/92295B29C2948/92438B29C2948/92647B29C2948/92685B29C2948/9279B29C2948/92933
Inventor 高福荣姚科成昱
Owner GUANGZHOU HKUST FOK YING TUNG RES INST
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