After the packaging material enters the packaging machine from the roll, it rises to the back of the packaging machine, and the vertical sealing strip is heat-sealed to the side of the packaging machine. The vertical seal adhesive has the following two main functions: to strengthen the vertical seal joint and prevent product leakage.
After bonding the longitudinal seal strips, the wrapper is coated with a hydrogen peroxide film on rollers, followed by a pair of pressure rollers to remove the excess hydrogen peroxide solution. At this point, the wrapper has reached its highest position and then moves downwards to form a cylinder through the vertical seal heater and the guide wheel. Residual hydrogen peroxide evaporates through the heater and the product begins to pour in. The liquid level of the product is always controlled below the level of the horizontal seal. The two pairs of transverse sealers continuously pull the wrapper over the packer, and the product continues to enter the packer.
Horizontal sealing is accomplished in two steps, bonding and cutting. Effective bonding requires two major factors, namely temperature and pressure. The temperature at the time of sealing is generated by the induction heating, and the cylindrical tube is clamped by the clamping jaws so that the paper tube becomes a rectangle.
The product is squeezed by the pressure of the jaws in the sealing area, and the U-shaped metal ring in the jaws is fed with high-frequency current. The high-frequency current forms a reverse inductor current in the aluminum foil layer of the packaging paper, so that the aluminum foil is heated and will Heat is transferred to the inner polyethylene to melt it. Under the pressure of the jaws, the polyethylene is cooled rapidly at the same time, the melted polyethylene is cured, and the sealing is completed. The cutter in the jaws after sealing closes the package in the sealing area.
The product is injected into the paper cylinder through the filling pipe, and its lower end is located below the liquid surface of the product, so that the formation of foam can be effectively prevented. The infused, sealed package is passed through a terminal former and the top and bottom corners are each bent, folded, and bonded to form.
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