Hot Melt Coating: Boost Adhesion with Innovative Technology



Hot melt coating involves heating and melting organic compounds such as asphalt, paraffin, polyethylene, polypropylene, polyethylene terephthalate, and polyacrylic acid resins into a liquid, and then coating the substrate. The coating is carried out in an adiabatic state, and the finishing is measured with blade. The coated paper web is cooled by a cooler or a cold cylinder; The molten coating is formed on the substrate to form coating. And the coating is rolled and processed into finished products.

Working principle

First, heat the hot melt adhesive box and guide the paper or other substrate in the direction shown in Fig.1. When the hot melt adhesive box is heated to the set melting point temperature of the hot melt adhesive, the hot melt adhesive is melted. The melted adhesive is pressed into the coating die by the hydraulic system; The coating die is placed against the substrate, and the hot melt adhesive is sprayed onto it. At the same time, start the transmission motor to press the pressure roll and the composite roll together, and adjust the pressure to the appropriate level; Adjust the flatness of the substrate by adjusting the position of the deviation roll; By adjusting the tension of the clutch and brake to control the traction tension of the substrate, the machine runs smoothly, thereby achieving good coating and composite quality and effect.

What are the factors that affect the coating of hot melt adhesive？
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Temperature: The viscosity of hot melt adhesive will change with temperature. Generally speaking, as the temperature increases, the viscosity of hot melt adhesive will decrease, resulting in an increase in coating amount. Therefore, controlling the temperature of hot melt adhesive is one of the important factors in adjusting the coating amount.
Pressure: The pressure of the coating machine can also affect the coating amount of hot melt adhesive. If the pressure is too high, the hot melt adhesive will be squeezed out too much, resulting in excessive coating amount; On the contrary, if the pressure is too low, the coating amount will decrease. Therefore, reasonable control of the pressure of the coating machine is the key to maintaining an appropriate coating amount.
Speed: The coating speed also has an impact on the coating amount of hot melt adhesive. Generally speaking, a coating speed that is too fast will result in a decrease in coating amount, while a speed that is too slow will result in an increase in coating amount. Therefore, adjusting the coating speed is one of the important means to regulate the coating amount.
Geometric shape and surface characteristics: In practical applications, it is necessary to consider the shape and surface characteristics of the coated object, such as flatness, roughness, etc. These factors will affect the distribution of hot melt adhesive on the surface, thereby affecting the size of the coating amount.
Click to get more information about Hot Melt Coating Laminating Machine

Advantage

Compared to traditional coating techniques, hot melt adhesive composite coating machine have the following advantages:
  • The melting point of the melt adhesive is relatively low, which saves energy during the production process;
  • The application amount and speed of adhesive glue are higher than traditional coating techniques;
  • The viscosity of hot melt adhesive is relatively high, so it can bond different materials more firmly;
Different adhesive systems can be used to meet the production and processing requirements of different industries. For fields with higher precision requirements, hot melt coating machine can not only greatly improve production efficiency, but also reduce product quality losses.

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