Operating principle

The hot air seam sealing machine is to use various external conditions (such as electric heating, high-frequency voltage and ultrasonic wave) to turn the sealing part of plastic film into viscous flow when heated, and fuse the two layers of film into one by virtue of relative pressure. After cooling, it adheres to the relative strength and sealing function to ensure that the product can accept relative external forces in the process of packaging, transportation, storage and consumption, so as to ensure that the product will not crack, leak Achieve the purpose of protecting the product.

Influencing factors

(1) heat sealing temperature: it is used to heat the adhesive film to an ideal viscous flow. The viscous flow temperature and differentiation temperature of polymers are the lower and upper limits of heat sealing. The difference between these two temperatures is an important factor to measure the difficulty of heat sealing.

(2) heat sealing pressure: its function is to make the polymer chain segments of the film that is already in viscous flow condition saturated and lax with each other between the sealing interfaces, and also make the distance between the polymers close to the result that intermolecular force can occur. The heat sealing pressure is too low, which may lead to poor heat sealing; If the pressure is too high, some chain segments in viscous flow state may be extruded, forming a semi blocking condition at the heat sealing part, resulting in wire drawing.

(3) heat sealing time: refers to the time when the film stays under the sealing knife. The heat sealing time determines the heat sealing temperature, pressure and equipment output power.

Source: manufacturer of hot air seam sealing machine www.jmhtjd. com. cn