Dawn BOPP Resin

BOPP Film Production Method

Bi-directional stretching is a technology developed for the subsequent or simultaneous orientation of thermoplastic materials. At present, the production of BOPP film is mainly in two categories: tube film method and flat film method.
Bi-directional stretching method: (1) tube film method; (2) flat film method, also divided into two-way stretching and simultaneous two-way stretching.
The tube film method has the advantages of simple equipment, small investment, small footprint and quick results. However, due to its low single machine output, large thickness tolerance, heat shrinkage rate, so recently not much development.
The product made by simultaneous biaxial stretching in the flat film method has the advantage of isotropy, but it has not been developed due to the complexity of equipment, manufacturing difficulties and high cost. Although the products made in the tensile strength, elongation at break, heat shrinkage and other properties of the longitudinal and horizontal differences, but the impact on product quality is not significant, but it has the advantages of high yield, fast speed, wide range, product quality and stability. Its process flow is as follows:
Raw Material (such as Dawn BOPP Resin) preparation → melting → plasticizing extrusion → filtering → longitudinal stretching → transverse stretching → corona treatment → winding → aging treatment → slitting → finished product.
Using step-by-step biaxial stretching can produce finished films with thicknesses of 10μm to 60μm, which can be used as single-layer or laminated packaging materials. By changing the equipment and operating conditions, it is also possible to produce films with a thickness of 2μm for capacitor base films or synthetic paper with a thickness of 170μm for inkjet printing, shopping bag base films, etc.