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Plastic blasting media abrasive


Introduction of plastic blasting media
Generally, the precious parts and components are spray-protected and painted before leaving the factory. Many of them are powder coatings. Because powder coatings are confirmed with the commissioning paint factory, powder coatings are accepted because they are metal substrate Has good adhesion, and can withstand mechanical damage during packaging and transportation.
However, this excellent performance also brings some problems, that is, the damaged parts need to be recoated, and the brushing fixture and hook must be cleaned.
This requires the powder coating to be removed so that the clamp and hook can regenerate the conductive field.
General paint strippers are expensive and not very effective for epoxy powder coatings. The paint stripping technology using molten salt or combustion paint stripping furnaces usually has a deleterious effect on the structural properties of its components, releasing nasty volatile components.

Pigment residues are generally left on the surface of objects. Sand blasting or glass bead blasting is effective for removing powder coatings, but it can still cause damage to soft metal surfaces such as aluminum.
The most advanced method of removing cured powder coatings is the use of plastic blasting media (PMB). Recycled plastic media produces only a small amount of dry residue and can be used for more than eight years, mainly for stripping paint on aircraft and aviation parts.
The plastic particles used in plastic blasting are harder than the paint film, but softer than the substrate, and the hardness range is 3-4 Mohs hardness. The Mohs hardness of a typical blasted abrasive is about 7. This plastic media has a pneumatic application range of 200-400 pounds per hour and pressures of 20-40 pounds per square inch. The nozzle is applied 0.5-1.5 feet away from the object. That is, in the sand blasting process, the volume is about 1000 pounds per hour, the pressure is 100 pounds per square inch, and the distance between the nozzle and the object is 3-4 feet. Powder coatings that can be effectively cleaned with plastic blasting media include electrical appliances, industrial machinery, storage tanks, vehicles and parts, aviation installations, military installations, building materials, shelves, furniture and vending machines.
When using plastic blasting media, some changes need to be determined, such as the blasting pressure, the angle of the nozzle and the substrate, the flow rate of the plastic medium, the residence time, the size of the nozzle, the distance between the nozzle and the part, and the type of coating , Substrate material and thickness, type and size of blasting medium, media pollution control, including pre-cleaning of parts, uniform coarse sand particle distribution (media supplement), shielding requirements and type of blasting equipment. These construction parameters are generally determined by equipment and media suppliers based on their past experience. The prior art equipment is suitable for using plastic media, and the basic feature is the electronic remote-control nozzle, which adjusts the air pressure of sand blasting and the flow of media from one substrate to another. Plastic sand blasting equipment also has other features, that is, the medium can be recovered by a precision cyclone equipped with low horsepower fans and motors. These separators can effectively remove all paint film residues and plastic media debris, and the media can be recycled and reused more than 30 times or more, with a media usage rate of about 9 pounds per hour.

There are currently 6 types of plastic media, 1 is polyester, 2 is urine formaldehyde, 3 is melamine formaldehyde, 4 is thermosetting phenolic formaldehyde, 5 is thermoplastic acrylic acid, and the more advanced is the 6th type, thermosetting polyallyl carbonate. Thermoset phenolic is not commonly used. The first type of polyester is the softest plastic media and is rarely used because it is too slow to grind. Type 2 urine formaldehyde is the most widely used plastic medium, accounting for 50% of the current medium consumption.
Company Name: Magin Dongguan Humen Meijun Wear-resistant Sandblasting Equipment Store Tel: 0769 26955965 13215392671
Address: 69 Longan 5th Road, Longyan Industrial Zone, Humen, Dongguan http://edghakxa.com
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