search.noResults

search.searching

dataCollection.invalidEmail
note.createNoteMessage

search.noResults

search.searching

orderForm.title

orderForm.productCode
orderForm.description
orderForm.quantity
orderForm.itemPrice
orderForm.price
orderForm.totalPrice
orderForm.deliveryDetails.billingAddress
orderForm.deliveryDetails.deliveryAddress
orderForm.noItems
PROCESS CONTROL | IN-LINE MEASUREMENT


Right: An in-line colour measurement probe from ColVisTec installed on a KraussMaffei compounding line processing PP


process, although Gomez says this is a significant change for the industry. “[Processors] have been operating in the traditional way — run production, send sample to the laboratory, do analysis, send results to production, adjust process, repeat — for decades,” he says. “The availability of new tech- nologies makes it possible to create very efficient plants that make instant adjustments, generate a comprehensive analysis of the process and don’t mask costs. A change in paradigm indeed, but to achieve it, companies need to change their mindset and invest in capital and personnel assets.”


Material savings The main benefits of making such changes are savings, particularly in the use of often expensive raw materials. Pigment quality variations are normal as well as variations in their feeding, resulting in too high or too low of a concentration, Gómez explains. Real-time measurements, however, allow immedi- ate adjustments to keep a product within specifica- tion. “In addition to raw materials, think of all the other processing costs associated with a bad run: energy, labour, utilities, operating losses, machine wear and tear, downtime, shipping, packaging and handling losses,” he says. Germany-based ColVisTec also offers an in-line colour measurement system. Its InSpectro X system also combines a spectrophotometer with optical fibre probes that are inserted in the extruder. It assesses process and product stability in the extrusion process through detection of changes that take place in the polymer melt, according to Fuat Eker, Director of Sales, Marketing and Customization at the company. In the InSpectro X system, the in-line UV-VIS


spectrometer measures optical changes in the ultraviolet and visible (UV-VIS) wavelength (220 to 820 nm) spectral range. “By directly observing


variations in the spectrum emitted from the polymer melt, we pick up any change in the process from the polymer itself. Such trends include colour changes, yellowing, degradation, transparency, dosage fluctuations, segregation of premixes, drift and colour/recipe changes. These are effects caused, for example, by change in process parameters such as temperature, pressure, speed, throughput, residence time and material feed,” says Eker. The UV-VIS in-line measurement technology was demonstrated at the K2019 trade fair in Germany on machines of three different extruder manufacturers that partner with ColVisTec: Entex (which makes planetary roller extruders), Leistritz, and KraussMaffei. The latter demonstrated the equipment as part of a liquid colour compounding process and was covered in the July edition of Compounding World.


ColVisTec’s spectrophotomer probes feature a durable self-cleaning sapphire tip


30 COMPOUNDING WORLD | November 2020


Combined spectroscopy For 2020, ColVisTec has added near infrared (NIR) and Raman spectroscopy and introduced its GiANT “3 in 1” spectroscopy platform. It also offers a “2 in 1” optical fibre probe that bundles UV-VIS and NIR fibres in one device that measures and displays information in the spectral range of UV-VIS and NIR (1,000 to 2,300 nm) at the same position in the process and at the same time. “This opens up new and extended possibilities for process monitoring in the extrusion and processing of polymers,” says Eker. For example, he says NIR can be used to measure the residual water content in various polymer applications, while Raman spectroscopy can be utilised for monitoring of chemical reactions during the extrusion process.


www.compoundingworld.com


IMAGE: KRAUSSMAFFEI


IMAGE: COLVISTEC


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66