Stretching Machines: Applications in Plastic Film Processing

As core equipment in the field of plastic film processing, stretching machine production lines occupy a crucial position in the manufacturing of packaging and industrial materials. Through precision biaxial stretching processes, stretching machines can significantly enhance the physical properties and mechanical strength of films, producing high-performance products that meet the demands of various industries.

In the field of food and consumer goods packaging, biaxially oriented polypropylene (BOPP) films and biaxially oriented polyethylene terephthalate (BOPET) films produced by stretching machines are among the most widely used products. These films boast excellent transparency, glossiness, barrier properties, and dimensional stability. By precisely controlling the longitudinal and transverse stretch ratios, temperature, and cooling processes, stretching machines enable the oriented arrangement of film molecular chains, thereby achieving high stiffness, low heat shrinkage, and good printability. These characteristics make BOPP films widely applicable to the outer packaging of cigarettes, food, gifts, and other products, while BOPET films are commonly used in high-end fields such as magnetic recording substrates, composite packaging, and hot stamping base films. An advanced stretching machine production line serves as the foundation for ensuring the market competitiveness of these packaging materials.

Industrial stretch wrap films and special industrial films are also important outputs of stretching machine production lines. Linear low-density polyethylene (LLDPE) stretch wrap films manufactured via stretching machine processes exhibit extremely high elongation at break, puncture resistance, and self-adhesion, which can effectively safeguard the stability and safety of palletized goods during transportation. Stretching machine technology can also produce special industrial materials such as BOPP electrical films for capacitor insulation and BOPET films for motor slot insulation. These products impose extremely stringent requirements on film thickness uniformity, dielectric strength, and mechanical properties. The stability and precision control capabilities of stretching machine production lines directly determine the quality and reliability of such high-end industrial films.

In addition, with the tightening of environmental protection requirements, stretching machines have demonstrated great potential in producing stretched films made from degradable materials. By subjecting bio-based materials such as polylactic acid (PLA) to stretch orientation, their mechanical properties and thermal stability can be improved, expanding their applications in eco-friendly packaging. This requires stretching machines to have a wider process window and better material adaptability, which reflects the technological innovation direction of modern stretching machine production lines.