The main structural components of the three-layer membrane blower can be divided into the following core modules, which work together to realize co-extrusion molding of the multilayer membrane:
1.Extrusion System (Core Power Unit)
Three separate extruders: one for each layer (usually designed with one extruder single or twin screw), responsible for melting and plasticizing different materials (e.g. PE, PP, PA, etc.). The screw structure (such as compression ratio, screw edge design, etc.) directly affects the uniformity of the melt and the exhaust effect.
Heating and cooling equipment: The drum is equipped with segmented heating coils (such as ceramic heaters) and an air-cooled/water-cooled system to precisely control the temperature of each section and prevent the material from overheating, decomposing or underplasticizing.
2.Mould system (key to Multi-Layer Melt Flow and molding)
Multi-layer Composite Die: adopt spiral distributor or flow path design, three layers of molds will be folded inside the die to form a uniform layered structure. Mould material must have high abrasion resistance (such as alloy steel) to withstand high pressure and high temperature for a long time. * Lip Adjustment Device:** Close loop feedback adjustment by bolting or hydraulic system fine-tuning the mold lip gap, controlling initial film thickness, and working with an automated thickness gauge.
3.**Inflation and Cooling System (Film Shaping Core)**
**Hinge Plate:** Flatten the circular film bubble into a double film. Angle and surface finish affect the wrinkling and transparency of the film.
**Cooling Air Ring:** Circumferential air duct surrounds film bubble. Up and down air flow is adjusted to control the film cooling rate and prevent stress concentration or crystal point defects caused by rapid cooling.
**Traction Roller Group:** Made up of rubber and steel rollers, it provides stable traction and further cooling membranes. It can also adjust the longitudinal stretch ratio of the film by speed difference.
4. ** Packaging system (finished product Processing Module)**
**Surface Winding or Center Winding Mechanism:** Selection of winding method based on film thickness. Thick films usually use a central winding (which holds the core in place by an air shaft), while thin films can use a surface winding (driven by friction).
**Tension control system:** Dynamic adjustment of winding tension by magnetic powder clutch or servo motor to prevent film stretching deformation or core loosening. Electrical Control System (Intelligent Control Hub)
PLC or Industrial Computer: integrated monitoring of temperature, pressure and speed parameters; supports recipe storage and fault diagnosis.
Human-Machine Interface: Operators can set process parameters (such as temperature in each area, screw speed, etc.) and view production data (such as output, energy consumption, etc.) in real time through touch screens.
6. Auxiliary Systems (to ensure production stability)
Vacuum Exhaust Device: connected to the extruder barrel to remove moisture and volatiles from the material and prevent bubbles or holes from appearing on the surface of the film.
Automatic Screen Changer: regularly replace filters to intercept impurities in the melt, reduce the risk of mold blockage, and extend continuous operation time of the equipment.
Side material recovery system: Reprocessing and reusing the side material of crusher and extruder to reduce the loss of raw materials.
Structural coordination logic: the raw material is melted in an extruder, three layers of melt are synthesized in the die head, the film bubble are inflated, cooled and molded, flattened with a traction rollers, and then wound up in a reel system. Each system is connected with parameters by electronic control (such as matching screw speed with traction speed) to ensure uniform film thickness and strong interlayer bonding.
