English
A multi-layer co extrusion biodegradable shrink PLA film production equipment. The present utility model relates to a production equipment for memory biaxially oriented heat shrinkable film. Adopting a 3-layer co extrusion composite method. Can produce new environmentally friendly packaging materials. Has ultra-high transparency. Glossiness. Memory contraction. High barrier properties. Strong puncture resistance. Good heat sealing performance and the above advantages. Can replace expensive imported equipment from Europe and America.
The device structure is as follows:
S0-1 rectangular rack platform. Made by welding and assembling square tube steel. Equipped with guardrails. stairs. Platform.
S1- form a 180 degree angle below the platform. Place 3 extruders. The extruder consists of (drive motor, reducer, base, screw, heater, cooling fan, screen changer)
S2-3 extruders are connected to the mold. The mold has a 3-layer stacked structure. Equipped with a heater. Diverter. Model body.
S3- There is a cooling air ring on the upper side of the mold. Install them sequentially above the lifting platform. According to the actual production process requirements. Free adjustment of height position.
S4- The lifting platform is equipped with a T-shaped screw. Screw. Bracket. Chain wheel. Chain. Drive, motor.
S5- The traction device is placed on the second and third platforms.. The traction device is equipped with two longitudinal stretching pulls. They are the first traction and the second traction respectively. Each is equipped with rubber sticks. steel rod. Herringbone board. Cylinder. Reducer, drive motor. Lifting device, the first traction is placed on the second platform, and the second traction is placed on the third platform. By adjusting the height of the lifting traction, the width of the membrane bubble can be adjusted. If it is raised, the membrane bubble becomes narrower, and if it is lowered, the membrane bubble becomes wider.
S6- The traction bracket is connected to frame 2. Each is equipped with guide rollers. Spread the flat stick. Tension sensor.
S7-2 rack. It is a multi story tower frame platform structure. Assembled by welding square tube steel. The height is around 10 meters. Equipped with guardrails. stairs. Guide roller bracket.
The topmost part of rack S8-2. Install the third longitudinal stretching traction device. Equipped with traction rollers. Cylinder. Drive motor, reducer.
S9- Place the third traction device on the lower side. The outer side of the two far-infrared ovens is made of stainless steel material. There is asbestos inside. Thermal insulation cotton. Heating wire. Ceramic tiles.
S10- The lower side of the oven is the cooling and shaping area. Divided into 3 cooling stages. There are three cooling air rings. Blower. Bracket.
S11- Place a stable foam rack on the lower side of the cooling area. Plays a stabilizing role in membrane bubble oscillation.
S12- Place the stable foam rack on the lower side. Rotating platform. Winder. The fourth traction.
S13- The rotating platform is installed on the base bracket. Equipped with a rotating gear plate and large gear. pinion. Drive the motor. Reducer. Conductive ring. It can rotate 360 degrees in both directions.
S14- The rewinder is installed on a rotating platform. Winder center coiling dual station structure. It has AB axis 360 degree bidirectional flipping. Automatic roll change. Automatic cutting, online slitting function.
S15- The fourth traction is installed at 1/3 behind the top of the rewinder. Vertically concentric with the center point of the rotating platform. The traction device is equipped with traction rollers. Drive the motor. Reducer. Herringbone frame. Cylinder.
The S16 herringbone board consists of guide rollers and brackets.
S17- The electrical control cabinet is placed on the outside of rack 2. Easy to maintain and operate. The electrical cabinet is equipped with. Frequency converter. Electrical component switch. Control the circuit. PLC module. Industrial control touch screen. Thickness gauge control cabinet.
The thickness gauge scanning frame is installed on the fourth traction A-frame. Follow the rotating frame. Real time online measurement of membrane bubble thickness.
technological process:
Convert different grades of PE.PLA. Resin raw materials, functional masterbatch, and additives. Put it into the hopper. Through the weighing vector device. Accurately enter the heating material barrel screw according to the set ratio. The screw is driven to rotate by the driving motor. Heat the solid raw material and plasticize it into a solution. Enter the composite mold. Form a circular membrane embryo for ring assembly.
Add air holes on the side of the mold. Gas filling valve. Inject compressed air. Inflate inside the membrane embryo. Adding air increases the diameter of the mold base. Conversely, it becomes smaller. The diameter of the embryo increases - the width of the membrane widens. Conversely, it narrows. The first inflation width of the membrane embryo. It depends on the amount of air entering. The thickness depends on the extrusion volume of the extruder and the first traction and stretching speed. The extruder speed is fast - the extrusion volume increases and the film embryo becomes thicker. Conversely, it becomes smaller. The traction speed is fast and the mold base becomes thinner. Conversely, it becomes thicker.
The embryo enters the wind ring vertically from bottom to top. (Air) cooling and shaping. Flatten the herringbone board into a sheet-like substrate.
The sheet substrate enters the first traction. The second traction. Longitudinal stretching. Pass through the guide roller from bottom to top. Enter the third traction device for longitudinal stretching. The stretching ratio determines the longitudinal shrinkage rate of the film. The larger the stretching ratio. The greater the longitudinal contraction rate of memory.
The sheet softens after entering the far-infrared oven. Vertically pass through the wind ring. Stable foam rack. Herringbone frame. Enter the fourth traction device. Inject air into the membrane embryo. Perform 3-5 times inflation and lateral stretching. Finally, enter the winding machine. Roll up the cylindrical substrate.
Under the oven. Equipped with a cooling air ring. Stable foam rack. Cooling and shaping of horizontally stretched and inflated film bubbles.
Thickness gauge - installed on the A-frame. Follow the circular rotation of the rotating frame. Scanning measurement of thin films. Measurement methods are divided. Non contact infrared light measurement. Contact capacitive measurement.
The membrane bubble enters the winding area. According to the size requirements of the film specifications. Online cutting. The winding machine can rotate 360 degrees in both directions. Eliminate the accumulation point of membrane bubble thickness deviation. Improve the flatness of the membrane surface.
The winding machine has. Automatic roll change. Record rice online. Online slitting function. High degree of automation. Easy to operate.
