Although steel packing straps are still widely used, they are inconvenient to process due to their high hardness, are prone to burrs, and have rough surfaces that can easily scratch your fingers, and are also inconvenient for product packaging. The new type of PET plastic steel packing tape has low density, good toughness, smooth surface and is not easy to hurt your hands. Because it weighs less and costs less material, many packaging industries are now beginning to use this product.
PET is a kind of ester bond that will decompose under the action of strong acid, strong alkali and water vapor. It is resistant to organic solvents and has good weather resistance. However, its disadvantages are low crystallization rate, difficult molding and processing, and high molding temperature. High, long production cycle, poor impact properties of materials.
The main method of PET plastic steel materials is film extrusion. Mass production can be carried out according to the grain properties of PET materials. This provides the best support for the mass production of PET plastic steel products.
The aspect ratio of the film extruder should be at least 24:1 and have sufficient horsepower. A standard three-roller sheet casting unit is used to produce light touch films. The film can be cast directly on the cold roller without rolling. In both cases, the die should be placed as close as possible to the calender roll because of its low melt strength. PET extrusion molding requires the lowest possible extrusion raw material temperature (generally about 525F). Excessive extrusion raw material temperature will cause molecular decomposition. Minimizing fouling on the chill roller ensures good film flatness. For this reason, the temperature of the chill roller should be just below the temperature at which adhesion begins to occur, usually 140 to 170F.
Nowadays, PET plastic steel packing buckles are mainly used for packaging boxes and bags. Because they are small in density and light enough, they are easy to carry and ship. With the assistance of special packing equipment, they are easy to use and fast.