Cast film manufacturers often face challenges including a wide variety of raw materials and frequent order changeovers. Different materials such as PP, PE, EVA and TPU have vastly different requirements for processing temperature, shear rate and cooling characteristics. Whether a cast film machine can achieve fast and stable switching between different materials directly affects production line utilization efficiency and delivery capacity. Through the coordinated design of screw system and temperature control system, Nanjing sumino Precision Machinery Co., Ltd. endows cast film machines with excellent material adaptability.

The adjustability of the screw system is the key to material adaptation. Different materials have distinct melting properties and rheological behaviors. The cast film machines from Nanjing sumino Precision adopt a modular screw design. Different screw configurations and length-to-diameter ratios can be selected according to material characteristics to ensure sufficient plasticization and homogenization of materials in the melting zone. For heat-sensitive materials, low-shear screws can be selected to prevent degradation; for high-viscosity materials, high-torque screws are available to guarantee melting efficiency.

The fast response of the temperature control system guarantees flexible material switching. Material changeovers usually involve substantial adjustments to temperature settings. The cast film machines of Nanjing sumino Precision are equipped with zoned PID control and fast heating/cooling channels, enabling temperature transition within a short period. Meanwhile, the equipment can be fitted with different types of dies and surface treatments for cooling rolls to accommodate the rheological properties and cooling requirements of diverse materials.

Process database supports efficient changeovers. Nanjing sumino Precision provides a complete set of technical solutions from material testing to presetting of process parameters, helping customers build a process database for different materials. When switching production tasks, operators can quickly call up the corresponding recipe, allowing the cast film machine to stably produce qualified products in a short time.