Introduction of hot melt adhesive coater

Hot melt adhesive coater is shown in the overview figure: it is a kind of equipment that makes a solvent-free, moisture-free, 100% solid fusible polymer into a solid at room temperature, heats and melts to a certain extent into a flowing and viscous liquid adhesive, which is coated on the substrate, usually including a composite part, and can compound another substrate with the glued substrate.

Because the process has; No drying equipment is required, low energy consumption: no solvent (hot melt adhesive is 100% solid composition), no pollution, and the operators will not be exposed to a large amount of formaldehyde due to cleaning the residual adhesive. Compared with the traditional solvent-based and water-soluble adhesives, the coating process of specially Ye manufacturing hot-melt adhesive coater has enviable advantages, effectively solves the inherent disadvantages of the traditional process, and is an ideal production tool for the renewal of the coating composite industry.

The curing of solvent-based and water-based adhesives requires an oven (or the existing oven may need to be renovated), takes up more plant space and increases the energy consumption of the plant; Will produce more wastewater and sludge; Stricter production and operation requirements; The disadvantage of solvent glue is obvious, that is, non Chang is not environmentally friendly (most solvents are harmful). Solvent based adhesives pollute the environment seriously. With the improvement of people's environmental awareness and the establishment and improvement of relevant laws, the application of solvent based adhesives is declining at a certain rate every year. Water based adhesive has the disadvantages of poor water resistance, poor electrical characteristics, long drying time and high energy consumption. Its application is also declining at a certain rate every year. Hot melt adhesive has the advantages of stable performance, high utilization rate of raw materials, fast production speed, high yield, small equipment floor area and small investment. It has the trend of gradually replacing solvent adhesive.

Equipment and working principle

Working principle of melt coating equipment and components

Hot melt adhesive coating machine

Hot melt adhesive coating equipment: it is a kind of hot melt adhesive that can melt the solid state, and transport the melted adhesive into liquid state through the pressurizing device to the adhesive coating device for coating the substrate. It is an electromechanical equipment integrating fine Yue temperature control function, fluid pressure transmission function and extrusion coating function. In addition, it has the function of automatic control and automatic tracking of the speed of the production line.

Host: it has the functions of heating and heat preservation, melting glue, outputting glue, controlling glue pressure, primary filtration and so on The temperature of the main engine should be controlled at 5-10 degrees higher than the melting point temperature of the glue solution Make it have certain liquidity Make the pressure control more accurate

Throat: it has the function of heating and heat preservation, guiding glue liquid, and outputting liquid hot melt glue from the host to the gun base module Keep the temperature slightly higher than the melting point of the glue solution.

Gun base: with heating and insulation, secondary filtration And deliver the glue to the gun body And if necessary, the function of heating compressed air Visible glue spraying effect, Guo appropriately increase the temperature. Make the glue liquid fluidity better.

Gun body: it has the function of opening and closing glue Various nozzles and scraping nozzles are provided as required To meet the needs of users There are spiral spray gun, coating and scraping gun, fiber spray gun, Z-shaped spray gun, dot gun and so on.

Automatic compensation control system: it has an output signal control solenoid valve. The compressed air controlled by the solenoid valve drives the gun body to control the opening and closing of the glue. And output 0-10V DC voltage to control the frequency converter to drive the motor to rotate. The output voltage is directly proportional to the speed of the measured production line. The glue position, glue breaking length and tracking voltage can be adjusted online. The devices to check the speed of CE production line include proximity switch, hot melt adhesive coater, rotary encoder, etc.

Hot melt adhesives are collectively referred to in the industry. In fact, there are many kinds of hot melt adhesives, including EVA, PA, PES, PUR, pressure-sensitive adhesive and so on.

The above information is provided by the hot melt adhesive coater