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On-line type polymer double-capillary extrusion rheometer

A polymer and capillary technology, applied in the field of polymer rheology testing, can solve the problems of extrusion products failing to meet quality requirements, time-consuming and labor-intensive, affecting the development of extrusion dies, etc., to achieve the effect of promoting further development

Inactive Publication Date: 2006-05-17
大连理工模具研究所有限公司
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  • Abstract
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Problems solved by technology

At present, when designing extrusion dies, there are not many considerations such as extruders, materials, and processes. Process parameters), so that the extruded product cannot meet the quality requirements
In this way, it is necessary to continuously adjust the process parameters and repair the mold, which is time-consuming and labor-intensive.
According to statistics, the time for mold repair, mold testing and process parameter adjustment accounts for 30% to 40% of the entire design and manufacturing cycle of extrusion molds, which causes a substantial increase in mold costs and affects the further development of extrusion molds

Method used

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  • On-line type polymer double-capillary extrusion rheometer
  • On-line type polymer double-capillary extrusion rheometer

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Embodiment Construction

[0014] The following result technical scheme and accompanying drawing describe the best embodiment of the present invention in detail.

[0015] Measure the steady-state extrusion rheological characteristics and wall slip velocity of the polymer material PVC at a temperature of 200°C,

[0016] Embodiment steps are as follows:

[0017] Step 1. First block a capillary with a plug. Use a single capillary, install the rheometer on the flange between the extruder and the extrusion die, and adjust the temperature control device to control the temperature at the temperature required for measurement. within the scope;

[0018] Step 2. Start the extruder, set the extrusion process parameters according to the measurement needs, and perform PVC extrusion rheological measurement;

[0019] Step 3. Through the adjustment of the adjusting bolt, a group of capillaries with the same diameter and different length-to-diameter ratios are respectively used to measure the pressure drop under the s...

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Abstract

The present invention relates to an on-line polymer double-capillary extrusion rheometer, belonging to the field of polymer rheo-testing technology. It is characterized by that said rheometer is formed from connecting tube, base seat, regulating bolt, pressure / temperature sensor, temperature control device, balance, extrusion expansion measuring device, casement plate, capillary and setting plate. Said invention also provides the working principle of said rheometer.

Description

technical field [0001] The invention belongs to the technical field of polymer rheology testing, and in particular relates to an online capillary extrusion rheometer for characterizing polymer extrusion wall slip velocity and steady-state rheological behavior. Background technique [0002] A rheometer for measuring the rheological properties of polymers is an essential experimental instrument for material research and plastic processing. At present, off-line rheological measurement is commonly used, among which capillary rheometer is the most widely used. However, when the off-line capillary rheometer is used to measure the rheological properties of polymers, due to the rheological parameters measured out of the actual processing conditions, it has limited guidance on the actual polymer processing process. In order to accurately obtain the pressure gradient over the fully developed region from the measured differential pressure, a Bergley correction is required. The depend...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/08G01P3/00
Inventor 赵丹阳王敏杰宋满仓于庆安
Owner 大连理工模具研究所有限公司
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