What is corona treatment?Corona treatment is an electric shock treatment that gives the surface of the substrate a stronger adhesion.The principle is to use a high frequency and high voltage to corona discharge on the surface of the treated plastic to produce a low temperature plasma.These ions are destroyed by electromagnetic shock and penetration into the surface of the substrates to oxidize and polarize the surface’s molecules. Ion shocks and erodes the surface, increasing the adhesion of the substrate surface.How to judge whether the corona treatment is qualified?Dyne test pens (≥38 mN/m) can be used as a quick test tool for surface energy after corona treatment, but are not suitable for tests for printed or coated surfaces. If the test pen draws a continuous line on the corona treated surface, we can say the surface energy of the material is not less than 38 mN/m. If the line is intermittent, the surface energy of the material is less than 38mN/m, indicating it is insufficient or even untreated, and thus does not meet the printing requirements.Can I use the same corona treatment machine for polypropylene corrugated sheets with different thicknesses?PP corrugated sheets for advertising need to be corona treated. The thickness of the sheets is usually 2-6mm.Generally speaking, the power required for corona treatment of thin sheets (2-6 mm) is small, but the power required for corona treatment of thick sheets (8-10 mm) is double more. If the power of the corona treatment machine is can be adjustable, then the machine can operate the corona treatment on either thick pp hollow sheets or thin ones.What should I pay attention to when using a corona-treated PP corrugated sheet?1）Try not to paste a temporarily used sticker on the corona-treated PP sheet because it has a strong adsorption to the glue. The glue will penetrate into the surface of the sheet and is difficult to remove.2）Keep clean of pp corrugated sheet. The corona treated sheet has a strong adsorption force for dust.3）Corona treated sheets have an optimum life span of six months. After six months, the corona effect will become weak. Therefore it is recommended to print and use the polypropylene corrugated sheets within half a year to ensure the best effect.Related productsPP corrugated sheet PP honeycomb sheet
Both corrugated plastic sheet and polypropylene honeycomb panel are a high technology hollow structure with features such as lightweight,non-toxic,waterproof,anti-termite,vibration damping,anti-aging and corrosion resistant. By adjusting formula or through chemical treatment of the surface, these polypropylene sheets have excellent performance on properties such as easy printing, UV resistance, flame retardant,electrical conduction and anti-static. Anti-static polypropylene sheets can be tailored to offer electrical properties spanning the surface resistivity spectrum from 106 to 1010 ohm/sq. Conductive polypropylene sheets can be tailored to offer electrical properties spanning the surface resistivity spectrum from 103 to 105 ohm/sq. But what is the difference between corrugated plastic sheet and polypropylene honeycomb panel? STRUCTURE Corrugated plastic sheet has twin wall profile extrusion, joined by series of vertical ribs. Polypropylene honeycomb panel is a sandwich structure with a honeycomb structure inside and two flat surfaces with either a bubble format or matte finish. COLOR The commonly used colors are: white, yellow, green, blue, red, black, gray etc.Color can also be customized, reaching 90% close to the original. The color of polypropylene honeycomb panel is mainly gray, followed by black and white. The color can also be customized.But due to high processing cost, the customized color is higher than that of corrugated plastic sheet. Physical properties When compared with corrugated plastic sheet,honeycomb panel has a better performance on resistance to high strength,impact and bendingstresses, and on sound absorption and vibration damping as well due to its different structure.