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Hot news ,developing ,technology of powder coating industry .
Relating Extender Size to Gloss
As discussed, the particle size of the extender is important in controlling both gloss and gloss retention during drying of the coating film. This is illustrated , where the 20° gloss measured for a decorative alkyd gloss paint is shown as a function of drying time for different barium sulphate grades. The total PVC for this paint system was 21.5% (including the extender), with a primary pigment volume concentration of 2.5%. The gloss value increases significantly as the extender Dv97Read More …
Color Fading – in the coatings
Gradual changes in color or fading are primarily due to the color pigments used in the coating. Lighter coatings typically are formulated with inorganic pigments.These inorganic pigments tend to be duller and weaker in tinting strength but are very stable and not easily broken down by exposure to UV light. To achieve darker colors, it is sometimes necessary to formulate with organic pigments. In some instances, these pigments may be susceptible to UV light degradation. If a certain organic pigmentRead More …
How to reduce the amount of pearl pigments
How to reduce the amount of pearl pigments If so , the less the amount of pearl pigments , ink costs will be lower , it will be powered by the larger pearl ink , but is there a good way to pearlescent pigments ink usage drop down? The answer is yes . Reduce the amount of the pearlescent pigment , so the fact is mainly oriented parallel to the flaky pearl pigments to achieve if the flaky pearl pigmentRead More …
Pearlescent pigment content and shape
In ensuring the ink pigment dispersed situation , it was studied the implications fabric screen printing ink pearlescent pigment amount of gloss . In the same method as in the ink formulation , to change the amount of the pearlescent pigment in the ink to a method to evaluate visual pearlescent effect, increasing research pearlescent pigment ratio of share of the ink when the pigment in an amount of 5% , the gloss less effective ; when the amount toRead More …
Pearl pigments application problems
With rapid development , pearl pigments have been more widely used in packaging , printing, publishing industry, from cosmetics , cigarette , alcohol , gift packaging, to business cards, greeting cards, calendars, book covers , to pictorial printing, textiles printing, pearlescent pigments figure everywhere. In particular pearls film for food packaging , increasing its market demand , such as in the ice cream, soft drinks , cookies , candy , napkins and packaging areas , the use of pearl filmRead More …
Powder Coatings Test Methods and Standards
Test Method Standard No. Examined Qualities Gloss test ASTM D523 measurement of gloss and matt of coatings (in percent) Thickness test ASTM D1005 measurement of film thickness of coatings using micrometers Bend test ASTM D522 measurement of bend of coating films Deformation test ASTM D2794 measurement of resistance of coatings to the effects of rapid deformation Adhesion test ASTM D 3359-02 measurement of adhesion of coatings Cupping test ISO 1520 measurement of coating resistance during deformation Powder density test ISORead More …
Attending CHINACOAT 2013
Jinhu Color Powder Coating will attend CHINACOAT in Shanghai city,China on Nov 20-22, 2013 . Exhibition: CHINACOAT2013 Date:20 -22 November 2013 Address:Shanghai New Int’l Expo Centre(SNIEC). If you go there,please inform us ahead of time,so that we can make a meeting. Introduction in brief Since 1996, CHINACOAT has been committing to create more values for trade visitors. Featured with a comprehensive mix of exhibitors from both developed and developing markets and a series of accompanying technical programmes (include Conference, Workshops, Seminars &Read More …
Powder coatings manufacturing process
Powder coatings manufacturing process The process of powder coatings production includes the following steps: Distribution of raw material Pre-mixing of raw material Extrusion (mixing of melted raw materials) Cooling and crushing the extruder’s output Grinding , classifying, and controlling of the particles Packaging Pre-mixing of raw materials In this step, the distributed raw materials of each production unit will be mixed based on the guidelines and formulization of research and development unit in order to have a homogeneous mixture under specific time conditions. Extrusion The homogeneous mixture of raw materials will be melted and mixed in the extruder machine under the pressure of spiral driver and temperature of electric bars. Then , the homogeneous melted mixture will come out of the extruder while controlling the temperature of different parts of the extruder . The cooling belt The melted mixture will be poured on the cooling rollers at the temperatures between 7 C and 10 C ,formed as sheets ,carried toward the crusher through the cooling belt, and finally ,changed into chips and prepared for grinding . Grinding and sifting The produced chips at the end of cooling belt will be transferred into a mill with a pin disk. The controlling and size measuring of the ground particles will be conducted by a classifier ; the size of output particles of the mill will be measured through checking the speed of the classifier ,the speed of mill’s router and remaining of the chips inside the mill, and controlling the air volume and the temperature of the conveyer of ground powders. Based on their sizer, the output powders of the classifier and the mill will be categorized into three parts: The part of very small particles ,smaller than 10 micron , will be separated in the silicone and transferred into a container of small particles and dusts ; the remaining particles will be transferred into a sieve located at the bottom of the silicone. The ultimate product will be packaged based on the size of the net ; the net separates the inadequate and big particles. Finally , those big particles will be sent back into the mill once again through a channel devised near the sieve . In the process of coatings circulation , an additive will be added to the coating during its grinding in the mill . Quality control unit The quality control unit, founded to control the quality of products , takes out soome samples during various stages of production , such as coating chips, coatings,and coating powders , and runs various experiments using modern laboratory equipments to control the expected technical features and ensure the quality of output products.
Powder coatings curing process in the Oven
Powder coatings curing process in the oven consists of three stages. First,the solid particles are melted,then they combine together ,and finally they form a uniform film or coating over the surface . Maintaining low viscosity of the coating for an adequate time is very significant to have a smooth and even surface. Having decreased during the curing process, viscosity tends to increase as soon as the reaction (gelling )begins. Thus ,reactivity and heat temperature have a significant role in creating aRead More …