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CCCs are frequently applied to steel coil and aluminium coil surfaces to render them corrosive resistant and to establish an adhesive base for organic coatings. Chromium VI, hexavalent chromium has been the most predominantly used form, but it’s usage is being curtailed through RoSH legislation owing to it’s toxicity. Chromium III is safe to use, and is still being used by many aluminium manufacturers in addition to newer alternatives based upon phosphates, manganates, silanes, etc
As NIR measurement is non contact and non destructive, the MCT 360 can be simply installed on line after the coating has been applied to measure the coat weight on a continuous basis, enabling automatic or manual adjustment to the coater. Control of coat weight is important as it impacts the physical and chemical properties of the sheet metal. The CCCs also “tie” the paint to the metal substrate to reduce or eliminate paint peel issues. This measurement is similar to other converting applications.
The gauge is installed parallel to and at a distance of 150 – 300mm from the metal sheet as it passes over a large diameter steel roller, or approaches rollers (for minimal web flutter). Measurement is made on the wet coat weight but the read-out is in terms of dry coat weight. The solids ratio must be kept constant or be known, so that a correction factor can be applied to the measurement read-out.
|Dry coatweight range||Expected measurement accuracy|
|*3-8 mg m-2||+/- 0.05 mg m-2|
* Note other coat weight ranges can be measured.
Certain applications require the NIR measurement of moisture or active ingredient in powdered, granular or flake material at a point where it is conveyed by gravity drop or air. The lack of continuous flow and varying product density are not suitable for measurement through a sight glass.
The Snorkel Sampler collects product via a stainless steel tube terminating in a sample cup and viewing window. The Snorkel Sampler is bolted to a spud attachment that is welded to the conveyor duct around a hole cut at the selected sample point and supported with a bracket. This allows easy insertion and removal of the Snorkel Sampler for routine maintenance.
The user selectable measurement cycle allows for sample collection and measurement followed by an air purge blast to empty the sample cup. The Snorkel Sampler also includes an adjustable delay cycle that holds the digital display, analog and digital outputs constant while the collection cup of the Snorkel Sampler refills for the next measurement cycle.
Process Sensors Corp. (PSC) will be an active participant and sponsor at the AIMCAL Web Coating & Handling Conference 2013 Charleston, SC. PSC will participate in Sunday and Monday Table Top Events and PowerPoint summaries. PSC will also present a paper on Monday, October 28th in Aimcal’s Processing Technology section at 10:30. The paper discusses “Controlling Re-Moisturizers to Reduce Edge Curl and Improve Web Flatness with Cross Direction Web Moisture Profile”.
AIMCAL Conference is October 27 – 30th in Charleston, SC. Industry experts gather to discuss problems and solutions. We hope to see you there!
Process Sensors Corp. (PSC) specializes in NIR transmitters for the measurement of moisture, coat weight, and film thickness in the packaging industry and moisture, oil, flavorings and degree of bake in the food industry. The MCT NIR transmitters are also used in mining, powder, and chemical industries. Pack Expo offered an opportunity to exhibit our products!
The MCT360 NIR Transmitter is routinely used at the inlet and exit of dryers, re-moisturizers, flavoring drums and other unit operations. The Guardian Cross Direction Web Profile System incorporates the MCT360 with an automatic scanning frame and encoder to supply a zoned web profile for monitoring or control of paper, film, foil or metal webs. The MCT330 is a stainless steel NIR gauge for high temperature, wash down or hazardous environments. The MCT660 Bench Top Analyzer is designed for at-line or laboratory measurement to speed grab sample analysis. Process Sensors also introduced the top of the line MCT460 series of NIR transmitters.
PSC also manufactures the RFM1000 for process moisture measurement in thicker packaging materials and whole nuts and beans and the RFM1000 BT for at-line and lab Radio Frequency measurements. PSC IR Division markets a wide variety of Thermal Imaging and Temperature measurement systems for process and hand held applications.
Plastic strips are fabricated in a continuous process into specific shapes based on application. Generally any long, narrow, solid plastic shape is likely to be considered a strip. Strips are found in new re-sealable applications every day from sandwich bags, chips, and many others. Moisture control is critical prior to wind up because moisture impacts proper winding and binding characteristics to other materials at the end converter. Improper moisture levels will cause expansion and contraction of the product roll which will then cause problems in the end user’s unit operations or unraveling.
A Near Infrared Moisture Transmitter is often complemented with a Thermal Imaging System to completely characterize the process. The Near IR Moisture Transmitter communicates with a Programmable Logic Controller (PLC) and outputs data history to an archiving PC. The PLC controls strip moisture via an air blower. Moisture ranges from 0.2 to 0.6% with targets usually around 0.4 to 0.5%.