Technology Aggregation: Semi Melting Is The Best State Of Powder Point Pfer.

Compared with ordinary coatings, hot-melt powder coatings have many advantages over P.

First of all, hot-melt powder coating agent is 100% solid component, without solvents and pollution-free.

Secondly, the coating process is easy to control, the coating quantity is accurate and the coating is uniform.

Thirdly, < a href= "http://www.91se91.com/news/list.aspx? Classid=101112105" > hot melt coating < /a > simple equipment, small footprint, flexible change.

At present, the fastest development of hot-melt coating technology in the world is powder coating.

However, at present, the technology of powder coating has not been popularized in large scale, and only sporadically appeared in some enterprises along the southeast coast. On the one hand, the equipment purchase channel is not smooth. On the other hand, the technology has invested much earlier, and the production time is longer, and the economic effect is slow.

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< p > powder coating is to melt hot polymer powder from the feeding bucket into the concave hole of the continuously rotating needle roller, and the needle roller can play the role of quantitative distribution. Then the rotary brush brushes the powder from the concave hole of the powder roller, and the powder is evenly distributed on the bottom cloth through the vibrating screen, and the hot melt powder is melted into the base cloth through the heating device, and the hot melt coating fabric is formed through cooling, calendering and crystallization.

The sintering temperature of the hot melt coating is very important, and the temperature must be controlled strictly according to the melting point of the hot melt polymer.

Too high temperature may lead to the phenomenon of infiltrating into the back of the nonwoven fabric, and the powder can not melt sufficiently at low temperature, which will affect the effect and quality of the coating.

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< p > according to the current research and statistics results abroad, the pfer of powder point is the key to ensure the uniformity of powder coating, and the effect of powder pfer depends on the selection of process parameters.

The main parameters of powder pfer are temperature, pressure and time, which is especially important.

The best state of powder pfer is the semi molten state of hot melt adhesive powder in the pit of the concave point roller.

If the temperature is too low, it will cause incomplete pfer. The hot melt adhesive is distributed in the paste on the cloth surface. When the temperature is too high, the hot melt adhesive powder will melt quickly, and it is difficult to completely pfer to the nonwoven fabric surface, resulting in a plug eye, that is, the molten hot melt adhesive that is not pferred in the pit hole of the concave point roller will cause great difficulties for the production.

Therefore, we must select and strictly control the temperature of the cloth and concave roller.

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< p > the researchers of the Department of materials science and engineering of Imperial College London believe that in general, the temperature of raw materials of nonwovens is polyester at 160 C ~190 C. The raw material is a href= "http://www.91se91.com/news/list.aspx Classid=101112108" > cotton fiber < /a > the temperature is controlled at 220 C ~250 temperature; the temperature of raw material is mixed with polyester and cotton, and the temperature is controlled at 180 C ~220 C, in which the powder point pfer effect is the best.

At the same time, there is another point that can not be ignored. When the powder point is pferred, the temperature control standard of the concave roller is to ensure that the hot-melt adhesive in the hopper is kept in the powder state, and the higher the temperature is, the better.

Usually, the hot melt adhesive of polyamide is 50 ~60 C, while the hot melt adhesive of low pressure polyethylene is 90 C ~95 C.

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< p > < strong > knowledge link < /strong > < /p >.

< p > > a href= "http://www.91se91.com/news/list.aspx? Classid=101112107" > hot melt powder < /a > is a white powder (coarse powder: 80 mesh powder, 160 mesh powder, 200 mesh 250 mesh) binder.

Coarse powder is mainly used for flocking pfer printing. Fine powder is mainly used for film glycosylation pfer printing. Because of its excellent adhesive property, it is often used as a high quality hot melt adhesive in other industries.

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< p > hot-melt powder is applied to the printing of various textiles, leather, paper, wood and other materials and the preparation of various kinds of mucilages.

The glue made from this product has the characteristics of water resistance, good fastness, fast drying speed, no blocking and no influence on ink color. It is a new environmental protection material.

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< p > usage: < /p >

< p > 1. heat pfer printing < /p >

< p > 2. making printing paste > /p >

< p > 3. screen printing < /p >

< p > 4. bronzing flocking printing < /p >

< p > 5. make hot melt adhesive < /p >