Hot melt marking knowledge -- -- - hot melt marking bubbles

Marking knows, in the hot melt marking delimit, often appear bubbles, such as soybeans, small, such as sesame, although such defects will not affect the service life, but look closely affect beautiful, it is always a difficulty in line of us!

Many years practice, communication industry, expert consultation, summarize found bubbles come mainly from six aspects of line, a method of inspection bubbles from where a shortcut to reduce the air bubble, concrete analysis is as follows:

A, the six aspects of air bubbles

1, the air heats the road clearance

When coating material temperature at 200 degrees (cover) to form lines at the same time, dry lines need to be 3 to 8 minutes, the road within a few minutes up through the air is heated in the thin seam of inflation.

A: big bubbles, bubble bursting coating is broken, and this is what we want, top out there would be no air bubble;

Part 2: the tiny bubbles also heavily silted up, marking has been dry, just stay in the reticule coating or the bottom line, this does not affect beautiful, and no one to pursue;

Three: bubble just out of the membrane surface, still heavily silted, coating is dry, pitting, although not affect service life, once has the owner in-depth study, let a person headache!

Solution to reference: high temperature 5-10 degrees, the material to improve the coating, the lower the viscosity of the paint flowing property, let the bubble row out;Or cut material temperature 5-10 degrees, improve the viscosity of coating, don't let the bubble up, stay within the lines!

2, the ground moisture to produce bubbles

The water will be vaporized in the wet pavement have bubbles, to stay dry rear can construction, early, late in winter should pay special attention to the moisture of the road.

3, the bottom oil dry also can produce bubbles

The bottom of the bottom oil before drying, solvent not completely volatile oil, heating volatilization will produce bubbles.To rear can delimit bottom oil is completely dry, or in addition to easy to cause air bubble, is easy to cause dry bottom oil deflagration, cause safety accident!

4, modified bitumen heated are prone to bubbles

To the highway as an example of high grade highway often USES the modified asphalt, modifier tend to have bubbles, when it is heated in owner in-depth research, the excessive pursuit of perfection, can add a micrometer or so when under-burnt clinker soybean oil or salad oil, sacrifice line of compressive strength, improve the material flow property, so as to reduce the bubble to meet the requirements of the owner.

5, alkaline cement road surface blister easily

Alkaline overweight prone to foaming cement pavement, I can only take two times to clean float ash, bottom oil way to overcome!Only reduce, not eliminate!

6, cement road surface loose bubbles

Encounter this kind of pavement, the symbol "winning", only 2 times base oil and adjust the temperature to balance!

Second, the way to test where bubbles come from

Inspection of the bubble is more problems or road: can use the same material in the aluminum plate or try to draw a knife on the plate, such as no bubble is not material issue!Can also be pushed the cart to the other road to draw a small section of the experimental comparison!

Third, a shortcut to reduce air bubbles

At the end of the road is dry, oil bubble when dry, reduce the bubble is the quickest way to adjust temperature, or when under-burnt clinker add one over one thousand soybean oil is used to adjust the flow property of material.