In the production process of color coated steel plate, the problem of collapse occasionally occurs, which will bring great trouble to the production. According to the analysis of experts, the main reason for the formation of collapse is that the friction
between layers of steel coil is relatively small. Through the experimental measurement, the maximum static friction coefficient between layers of different kinds of color coated steel plate is determined, and the causes of collapse of different kinds
of coating are compared and analyzed from the micro point of view Combined with the case of collapse, the preventive measures are given.
The edge roll is uneven and easy to loosen, and the sandwich plate is easy to deviate.
The edge of color coated steel plate is not well rolled
After unpacking, the steel coil begins to appear flat coil (about 500mm ）, unable to roll up.
Color coated seel flat roll
How to prevent collapse
One In addition to the horizontal packaging specified by the user, in order to prevent paint sticking, it is better to use vertical packaging, and the transport
and loading and unloading of color rolls also need to be vertical.
Two . set the coiling tension (taper coiling tension) according to certain procedures.
Three Control the baking temperature and cooling temperature of the coating according
to certain procedures.
One . the finished color coated rolls of horizontal packaging shall not be stacked over each other to prevent paint sticking and roll collapse;
Two The paper sleeve must be used when the embossed
products are taken up.
Three . the embossed products must be packed vertically.
Triangle wood must be placed at both ends of horizontal packing steel coil stacking to prevent rolling during transportation.
After long-distance horizontal transportation or long-time extrusion, the color coated plate is easy to get sticky paint.
After coil production Three Months open package use, installation Six Months (aluminized zinc Fluorocarbon), a large area of discoloration and corrosion appeared on the surface. After half a year's use, a large area of black dust
has accumulated on the wall, which can be wiped off with napkin. The white spots on the wall are handprints and footprints, which should be left during installation. The color of the white spots is the normal jade white color. The black ash on the wall
was piled up before installation. Due to external factors, white spots and rust can be removed after washing.
Color coated steel plate - rust
On the installed roof Two Months later, there were a large number of floating rust particles; there were more core pulling aluminum anchor nails on the roof that had begun to rust; the rust spots were scraped with coins to expose the primer and
galvanized layer, and no rust spots were found; a part of the roof was covered with film during processing, and there were also more rust spots on the film, and the film was peeled to expose the color coated plate, and no rust spots were found. It is
confirmed that the color coated steel plate meets the factory standard. The rust point is caused by the slow corrosion of the small metal particles adhered to the steel plate surface.
Color coated steel plate - Rust spot
How to prevnt rustin
matters needing attention
One . select materials correctly according to the use environment (corrosive atmosphere, temperature, sunlight). The ordinary polyester coating can not be used in the chemical plant, under the use of alkaline medium,
careful use of galvanized, aluminized zinc color plate, etc.
Two . the incision shall be placed in the concealed part as far as possible without being exposed, and all cutting edges shall be properly protected.
Three . it shall not be soaked
by water, and shall be stored indoors to avoid outdoor stacking.
Four . during cutting and welding, there shall be no metal scraps left on the plate surface. After construction, water shall be used for thorough cleaning. Generally speaking Six Clean
once a month, and the coastal and industrial pollution areas should be cleaned more frequently.