Technical Articles

Dynisco has published these technical articles:

(Manufacturing Equipment and Components)
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The quantity of polymeric material used to produce consumer products is increasing on a daily basis. Along with this increase in material consumption is a corresponding increase in plastic waste...
(Process Controllers)
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Extrusion is a continuous process and successful economic production depends on maintaining stable output and melt quality at an accurately controlled rate. Current screw design technology, the use of...
(Pressure Sensing)
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Many transducers in fluid power systems fall victim to short-duration pressure overloads - commonly called pressure spikes. If these spikes are severe enough, a permanent, positive zero shift in the...
(Pressure Sensing)
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One of the fastest growing areas for the use of pressure measurement instrumentation is in the co-extrusion of multi layer barrier structures. Many leading co-extrusion design and manufacturing firms,...
(Meters, Readouts and Indicators)
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ATC990 Process Controller and UPR900 Process Indicator technical notes, applications and setup....
(Pressure Sensing)
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The conventional units for defining pressure are PSI, pounds per square inch. However, in all pressure measuring devices, a reference pressure has to be established and the PSI qualified to indicate...
(Process Controllers)
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The Machinery Directive standard EN ISO 13849-1 is a European safety regulation. This is a generic standard defining the requirements for the safety-related parts of control systems.. The primary goal...
(Pressure Sensing)
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Most applications for pressure transducers are relatively straightforward. Install the transducer according to manufacturer's recommendations, and obtain an accurate reading from an exceptionally...
(Molding Equipment and Supplies)
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This study examined the improvements in injection molded part quality using cavity pressure to initiate switchover from injection pressure to holding pressure. Cavity pressure produced more...
(Calibration and Testing Services)
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Two areas where the melt flow rate test it is not useful are related to processing....
(Calibration and Testing Services)
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Here are the steps to take in cases where the MFR is not provided by the polymer supplier....
(Calibration and Testing Services)
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If you spend a lot of time looking at data sheets you have probably noticed a trend over the last several years in how the melt flow rate (MFR) is reported. Along with, or instead of, the MFR, a new...
(Calibration and Testing Services)
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To fully appreciate the strengths and weaknesses of the melt-flow-rate (MFR) test it is important to know something about the way the test is performed....
(Calibration and Testing Services)
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There is a well-established relationship between something called the weightaverage molecular weight of a polymer and a parameter known as the zero-shear viscosity....
(Calibration and Testing Services)
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Few molders perform the test in-house. Of those that do, most don't understand why they are doing it or what they are measuring....
(Calibration and Testing Services)
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There are two points in the manufacturing supply chain where a determination ofaverage molecular weight (MW) is important. The first is when the material is firstreceived by the molder. The second is...
(Calibration and Testing Services)
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Once degradation has been established, the discussion inevitably turns to how it happened. It might be expected that the answer to this question is widely known. Not so. The good news is that the...
(Calibration and Testing Services)
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Here is why the melt flow test is not universal. As useful as the melt flow rate (MFR) test can be, it is not universally applicable. Fundamentally, the test is intended to document differences in...
(Calibration and Testing Services)
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Though often criticized, MFR is a very good gauge of the relative average molecular weight of the polymer. Since molecular weight (MW) is the driving force behind performance in polymers, it turns out...
(Pressure Sensing)
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The Need For Pressure Measurement in Extrusion In order to maintain the dimensional stability necessary to produce extruded products that meet todays precise quality and tolerance specifications, it...
(Pressure Sensing)
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Extrusion processors are employing melt pressure transducers more and more frequently to help them improve output and melt quality, enhance production safety, and safeguard machinery. To select the...
(Pressure Sensing)
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When selecting a melt pressure transducer, the first factor you should consider is the pressure range that will be measured. Available in ranges between 0 and 25 psi and 0 and 30,000 psi, transducers...
(Pressure Sensing)
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A transducer is an electronic device that converts energy from one form to another. In the case of a Dynisco pressure transducer, the process fluid exerts a pressure force on a thin flexible metal...
(Pressure Sensing)
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An oil-filled sensor has the advantage of being non-toxic and therefore compliant for many food, medical or other critical applications. A disadvantage of an oil-filled system is that the organic oil...
(Manufacturing Equipment and Components)
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The overall performance of an extrusion line is strongly dependent upon selection of processing conditions and proper maintenance of extrusion hardware. Management should not expect to achieve a...
(Pressure Sensing)
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When specifying a pressure transducer for a process measurement, a number of items have to be considered. Some of the more important ones are discussed in terms of the transducer itself as well as the...
(Pressure Sensing)
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It has long been known that pressure instability for polymer melt entering the die usually results directly in ouput variation. From 1960 to 1964 various investigators at DuPont and Union Carbide...
(Pressure Sensing)
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Due to the precise quality and tolerance requirements of today's extruded products, it is very important to keep both the output rate and the melt condition constant (1). Melt pressure, which is one...