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Now Gneuss viscometer

Posted On : Dec-07-2011 | seen (195) times | Article Word Count : 569 |

First Introduction In order to ensure product quality and operating efficiency? efficiency when processing sensitive polymers, the cross?
First Introduction In order to ensure product quality and operating efficiency? efficiency when processing sensitive polymers, the cross?


All observe a number of key processing parameters. Polymers, which degrade the hydrolysis of the shear stress or heat and / or oxidation, is extremely useful to monitor the viscosity of the polymer Onli?No. For example, in the processing described here PET sheet for thermoforming.Depending on the temperature and humidity, the molecular reduce the weight of the chain. Humidity on

viscosity of the PET molecular weight (which is measured IV? Intrinsic viscosity) with the Differen? During the same period of time and moisture level same temperature as shown in Figure 1. Illustration Figure 1: The degradation of polyester hydrolysis?

IV polymer melt as a function of the quantity of water (at 280 ° C. stay time - 1 min.) Graph it is clear that the recycling of PET heat,
the residual moisture content of the sheet? or drying efficiency (in addition to temperature, Residenti?

CE time, the shear stress and pressure) have a significant polymer melt flow properties of impact.If the viscosity of the polymer drops, SE economy to the adverse effects of mechanical properties the final product.

Lower molecular weight reduced tensile strength and the sheet (after the production process) out there? moformed into a deep, thin-walled containers, thin the container wall is likely to split.

More problem is to maintain the same sheet thickness Tole? Rance, where the polymer viscosity varies mate? Rial flows through the die differently depending on viscosity. One of the main reasons vary, my book? Sture is content to live in different time mate? Rial, drying equipment, drying temperature, drying gas temperature and dew point exposure to ambient air. Even if all the above factors are considered stable, the residual moisture content input can be varied (eg, season), the melt viscosity and molecular weight of the film.

It is well known that problems arise, such as moving from a drying device to another. In order to reduce the viscosity fluctuations, manufacture of PET sheet thermoforming are you? pically producing sheet thicker than necessary? reby using more material than necessary. Monitoring the viscosity can be a pro? ducer to take corrective measures. Measurement Molecular weight or intrinsic viscosity is typical?

Possible only with sophisticated laboratory equipped with? and not in real time. For this reason, a simple and reliable real? Visco time? sity measurements (correlation to Intrinsic viscosity) offers a valuable opportunity PET sheet manufacturer. The second Now Gneuss viscometer Gneuss has now viscometer permits continuous monitoring of melt viscosity and handling conditions.

This unit was to design briefs device that is compact, so it is easy to light? Sit without adversely affecting the process (at the MEA? surable increase in residence time), easy to use, it maywithstand the rough conditions of production and the provides reliable results (precision after calibration) com? parable of the accuracy of laboratory results.

Now, usually flanged viscometer bet? Expect such a screen changer and melt pump extrusion lines. Melt channel diameter can be tailored to the customer's existing equipment(Between 20 and 110 mm in diameter? Fig. 2) and? within certain limits? hole model connections can be varied to be compact installation. Equipment includes melt flow (Metering) pump with motor, reducer? box and melt pressure and temperature? New sensors in conjunction with the visualization and control hard and software.

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