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Monthly maintenance and inspection schedule for cure oven
Monthly maintenance and inspection schedule Fuel safety shutoff valves These valves stop the fuel supply in an emergency. Check all manual and motorized fuel valves to see if they are operating properly. Fan and airflow interlocks Now is the time to inspect the air switches that regulate air movement and fan operation . These devices assure that that the oven is purged properly before ignition. They also assure that the fans are providing the correct air movement in and outRead More …
Weekly maintenance and inspection schedule for powder coating oven
Weekly maintenance and inspection schedule Burner blower impeller and motor The cleanliness of the fan impeller directly affects burner blower efficiency . Periodic cleaning keeps the blower in good condition,preventing premature bearing failure. Keep blower motors clean to avoid overheating, which can cause electrical failure. By simply removing dirt buildup on the motor housing and cooling fins, you can eliminate costly motor replacement. Heater shell interior Now is a good time to check the heater shell, or firebox,for cleanliness. RemoveRead More …
How to prevent your parts from being half baked-Powder coating oven
Powder coating ovens are an integral part of any powder coatings system. Problems with them can mean the difference between having fully cured parts or having field failures,such as coating adhesion difficulties. With little effort ,a cure oven can consistently provide the energy required to cure the applied powder coat. Convection ovens ,on the one hand,are the most complex type of cure system,requiring the most upkeep.burners,blowers,duct work,and associated moving parts need periodic preventive maintenance. Infrared systems,on the other hand, are relativelyRead More …
Adhesion of Dimer-Based Polyurethanes to Various Substrates
Dimerized fatty acids are expected to have a high affinity for low-energy surfaces, since the long alkane chains show a structure similar to polyethylene.Polyurethane adhesives were prepared from a variety of polyether and polyesters diols and pure MDI in an NCO:OH ratio of 2.5.These materials were tested as adhesives for two polyethylene substrates and for steel after full cure.It should be realized that these tests were performed to quantify the difference in adhesion of the PU resins to polyethylene forRead More …
Four different chemical methods can be used against plastics deterioration
Theoretically, there are four different chemical methods that can be used against plastics deterioration. The first technique is to introduce additives that absorb light before they can contact the degradation-initiating center and the energy is dissipated as heat. The second way consists in deactivating the excited state of the initiating center.Again, such reactions produce energy, which is generated either in the form of heat or as fluorescent radiation. In the third method, the hydroxyperoxides that have been formed are transformedRead More …
Some Important factors to polyester coating degradation
Polyester degradation is affected by solar radiation, photocatalytic admixtures, water and moisture, chemicals, oxygen, ozone, temperature, abrasion, internal and external stress, and pigment fading.Out of all these, the following factors, all present in outdoor weathering, are the most important to coating degradation: moisture, temperatures, oxidation ,UV radiation. Moisture Hydrolysis occurs when a plastic is exposed to water or humidity.This chemical reaction may be a major factor in the degradation of condensation polymers such as polyesters , where the ester groupRead More …
Eliminating Agglomeration Resulting from the Grinding Process
The investment in a liquid nitrogen cooling system has proven to be a very cost-effective solution to the powder agglomeration problem. The grinding of solid materials to produce powders is a common manufacturing step found in many industries.In the coatings industry,grinding may be used in the preparation of pigments and of powder coating.Of particular focus in this article is an application solution successfully deployed in the production of powder coating. In the powder coating industry,several different types of polymeric matricesRead More …
TEST METHOD-CROSS-CUT TAPE TEST-ASTM D3359-02
10. Apparatus and Materials 10.1 Cutting Tool9—Sharp razor blade, scalpel, knife or other cutting device having a cutting edge angle between 15 and 30° that will make either a single cut or several cuts at once. It is of particular importance that the cutting edge or edges be in good condition. 10.2 Cutting Guide—If cuts are made manually (as opposed to a mechanical apparatus) a steel or other hard metal straightedge or template to ensure straight cuts. 10.3 Rule—Tempered steelRead More …
Procedure for X-CUT TAPE TEST METHOD-ASTM D3359-02
Related Articles: Testing Methods for Powder Coating Standard Test Methods for Measuring Adhesion by Tape Test 7. Procedure 7.1 Select an area free of blemishes and minor surface imperfections. For tests in the field, ensure that the surface is clean and dry. Extremes in temperature or relative humidity may affect the adhesion of the tape or the coating. 7.1.1 For specimens which have been immersed: After immersion, clean and wipe the surface with an appropriate solvent which will not harmRead More …
ASTM D3359-02-TEST METHOD A-X-CUT TAPE TEST
5. Apparatus and Materials 5.1 Cutting Tool—Sharp razor blade, scalpel, knife or other cutting devices. It is of particular importance that the cutting edges be in good condition. 5.2 Cutting Guide—Steel or other hard metal straightedge to ensure straight cuts. 5.3 Tape—25-mm (1.0-in.) wide semitransparent pressuresensitive tape7 with an adhesion strength agreed upon by the supplier and the user is needed. Because of the variability in adhesion strength from batch-to-batch and with time, it is essential that tape from theRead More …
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