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A low-temperature shrinkage high barrier 7-layer co extrusion blown film unit. Low temperature shrink film process using co extrusion of PVDC and PE, PP, PA, EVOH. Two layers of PVDC can also be produced. Greatly improve barrier performance. PVDC is the most comprehensive barrier in plastic packaging in the world today, involving food. Medicine. Cosmetics. Chemical industry. Electronics. Military firearms. Missile. In the field of nuclear energy packaging. Fill the gap in the current market for bi-directional shrink packaging through extrusion molding. Replace casting extrusion and dry composite processes. The only composite and casting processes available on the market are uniaxial stretching. Not possessing biaxial tensile properties.
The advantage of this device lies in. Using the down blowing process not only allows for PE and PA. EVOH。 Co extruded symmetric structure films can also be used to produce asymmetric films. By replacing the mold mouth and cooling the shaping structure, conventional barrier films can be produced. We can also produce 1 or 2 layers of PVDC low-temperature shrink film. 3. It can produce PP and PE.PA co extruded heat shrinkable POF memory films, as well as bi-directional low-temperature shrinkage PVDC barrier films. 4. Biodegradable barrier films can be produced through raw material formulation processes. Co extruded with conventional PE film. 5. Equipped with corona treatment bridge device. Easy to print corona on the surface of the film. 6 adopts a 360 degree unidirectional rotation structure for winding. Can produce thin films with adhesive surfaces. The whole machine adopts CPU centralized control and management. Ethernet remote monitoring. 8. The bottom of the mold is equipped with a dedicated device for adding opening agent. Driven by a small extruder and motor. Uniformly feed into the mold. The speed can be adjusted. 9 can selectively mix raw materials to produce high barrier properties. Low cost film products.
The device structure is as follows. Main platform 1 is equipped with gantry 2, which is installed with aerial vehicles. There is a mold installed under the aircraft. Mold 3 is equipped with 7 extruders arranged in a 270 degree equal division around its circumference. The extruder is equipped with screws, reducers, motors, hoppers, and cooling fans. The heater and extruder are equipped with tracks and V-shaped pulleys at the bottom for easy disassembly and installation. A lifting platform 4 is installed below the mold. The lifting platform consists of T-shaped screws and chains. Chain wheel. Motor assembly composition. Easy to adjust the distance between the water tank and the mold mouth. Platform 4 is equipped with a vacuum water tank 5. The interior of the water tank is equipped with a vacuum sizing copper sleeve. Equipped with a shower nozzle for easy shaping and cooling, and used in conjunction with a vacuum pump, the external structure of the water tank is made of transparent organic glass. Easy to observe the internal state. Below the platform. Place the traction frame 6, which is supported by iron plates. There are 2 traction systems. Install along the XY axis. The Y-axis is placed concentric with the mold axis. Above the first traction roller 7, there is a stainless steel herringbone plate for adjusting the angle of the film bubble. A stainless steel sink is installed below the traction roller. Facilitating the discharge of cooling water from the water tank, a bridge aluminum guide roller is installed between the first and second traction rollers to facilitate the threading direction of the corona machine. Install 80% of the X-axis for the second traction. A stainless steel insulated water tank is placed below the traction roller. The tank is equipped with a bridge guide roller and a drainage valve inside. Water replenishment valve. Inlet valve. Magnetic flap remote signal sensor, water level display sensor. The sink cover adopts a flip hinge structure for easy opening. Install universal casters at the bottom of the sink for easy relocation and cleaning. The sink is equipped with a liquid heating pump 10 for circulating hot water, and a traction frame 11 is placed at the other end of the sink. The entire traction frame is located inside the auxiliary frame 12. Install two traction systems on traction frame 11. They are the third traction of 13 and the fourth traction of 14. Install an external infrared radiation heating oven between the third and fourth traction. The oven adopts a double door structure for easy opening, and is equipped with a heater, thermometer, temperature sensor, and sliding flange. Linear guide rail, install cooling and shaping air ring 15 above the fourth traction 14. The air ring is equipped with a fan. There is a stable bubble holder 16 installed above the air duct and air ring 15, which is fixed on the auxiliary frame 12. The auxiliary frame is divided into 2 layers. A lifting traction frame 17 is installed above the stable foam rack on the first floor platform. The fifth traction frame 18 and the herringbone board 19 are installed. Lift screw 20 and lift motor. The second platform above the towing frame. There is a gap for easy film routing. The second platform is installed. Pneumatic swing arm frame 21. The swing arm is equipped with guide rollers. Sensors, steering devices. Cylinder. The pneumatic swing arm is connected to the 6th traction frame 22. The traction frame is equipped with a lifting screw 23 and a motor, and a herringbone plate 24.Install an external infrared radiation heating oven on the first platform below the traction frame. The oven adopts a stacked segmented structure for easy transportation and disassembly, and is equipped with an electrical control cabinet. Install 2 cooling air rings 27 below the oven for cooling the film. The wind ring is installed on the bracket. It can move freely and is equipped with 2 independent fans and air ducts. A single station automatic rewinding machine is placed below the first level platform corresponding to the wind ring. The bottom of the rewinding machine is equipped with a box frame. 30. Install the rotary gear plate on the frame. Fix the rotary gear plate on the winding machine platform. 31. Install the winding machine on the platform. 32. Install the rotating motor. 33. The winding machine is equipped with guide rollers. Flying knife. Inflatable axis. Flip frame. Translate. Unloading. There is a 7th traction track above the winding machine. 34. Traction installation of herringbone plate adjustment frame. 35. There is a conductive ring at the bottom of the winding machine. Power supply.
The equipment process is as follows:; Different performance raw materials are fed into the screw for heating from 7 extruder hoppers. The mold is propelled by a motor driven screw. Form a circular mold base. The outer wall of the mold base is adsorbed onto the inner wall of the circular copper piece through a specially designed vacuum shaping device. The shower nozzle installed on the inner circumference of the water tank cools it down. After the film embryo cools, it passes through the angle of the herringbone plate. Enter the first traction roller for stretching. Form a sheet and enter the second traction roller for stretching. A bridge turning guide roller is installed between the first traction and the second traction. Easy to install corona machine for corona treatment. The film is heated in the hot water tank by the second traction roller and stretched by the third traction roller. The sink adopts an insulation structure. Circulating flow by liquid heating pump. Always at a constant temperature of around 90 degrees, the liquid pump is a vacuum chamber. Equipped with self-priming pump. Connect with the pipeline to ensure the stability of the water volume in the sink. The sink is equipped with a floating liquid sensor. Automatic hydration. The film enters the oven for heating through the third traction and then enters the fifth traction. Perform a second inflation. According to packaging requirements, perform 1/5-1/8 inflation and cool with an air ring to shape. The inflation method is to use an air gun to add air into the film to form a circular embryo. Enter the fifth traction stretch again. If the width of the film is not enough, it can be adjusted through a lifting frame. Lowering - the film widens. Rising - narrowing of the thin film. After the film enters the fifth traction. Enter the 6th traction track through the pneumatic swing arm. The swing arm is used to adjust the lifting and lowering fluctuations between the fifth and sixth traction of the buffer. The swing arm is equipped with precision regulating valves and sensors. Used to regulate cylinder pressure and provide feedback analog signals. After the sixth traction of the film. After being heated in a zigzag board and far-infrared oven, it undergoes the third inflation. After being cooled and shaped by two air rings. Enter the herringbone board and seventh layer traction. Until it is rotated and coiled. The winding roller adopts mirror treatment. The third inflation method is the same as the second one. Inject air to inflate. Adjust the width deviation of the film by lifting and pulling. The entire process can be summarized as three rounds of inflation. Three heating cycles. 3 cooling cycles. 7 traction stretches. Production of high barrier PVDC bidirectional low-temperature shrink film. Fill the market gap.
