A low-temperature shrinkage high barrier 7-layer co extrusion blown film unit, using the low-temperature shrinkage film process of co extrusion processing of PVDC and PE.PP.PA.EVOH. It can also produce 2-layer PVDC, greatly improving the barrier performance. PVDC is the most comprehensive barrier in plastic packaging in the world today, involving food. Medicine. Cosmetics. In the fields of chemical engineering, electronics, military firearms, missiles, and nuclear energy packaging, we aim to fill the gap in the current market for extrusion molding and bi-directional shrink packaging. Instead of extrusion casting and dry composite processes, the composite and extrusion processes on the market only have unidirectional stretching and do not have bi-directional stretching performance.
The advantages of this device are:
1. Adopting the down blowing process can not only achieve PE and PA. PP. EVOH。 Co extruded symmetric structure films can also be used to produce asymmetric films.
2. 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. Adopting a 360 degree unidirectional rotation structure for winding. Can produce thin films with adhesive surfaces.
7. 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. High barrier performance can be produced by selectively proportioning raw materials. Low cost film products.
The device structure is as follows:
Main platform
1. Equipped with a gantry frame.
2. Longmen frame 2 is equipped with aerial vehicles. There are molds installed under the aircraft.
3. There are 7 extruders installed on the circumference of mold 3, arranged in a 270 degree equal division. The extruders are equipped with screws, reducers, motors, hoppers, cooling fans, heaters, and a track and V-shaped pulley at the bottom of the extruder for easy disassembly and installation. A lifting platform is installed below the mold.
4. The lifting platform consists of a T-shaped screw rod, chain, sprocket, and motor assembly, which facilitates adjusting the distance between the water tank and the mold mouth. Platform 4 is equipped with a vacuum water tank.
5. The water tank is equipped with a vacuum sizing copper sleeve and a shower nozzle for easy shaping and cooling. It is used in conjunction with a vacuum pump. The external structure of the water tank is made of transparent organic glass for easy observation of the internal state. A traction frame is placed below the platform.
6. The traction frame is supported by an iron plate and has 2 traction lines installed along the XY axis. The Y-axis is placed concentric with the mold axis, and the first traction roller is used.
7. There is a stainless steel herringbone plate above 7, which is convenient for adjusting the angle of the membrane 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. Second traction.
8. X-axis installation. Place a stainless steel insulated water tank under the traction roller.
9. The sink 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. circulating hot water, with a traction bracket placed on the other end of the sink.
11. The entire traction frame is located on the auxiliary frame.
12. Install two traction systems on traction frame 11, each for the third traction.
13. With the fourth traction.
14. Install an external infrared radiation heating oven between the third and fourth traction.
15. The oven adopts a double door structure for easy opening, equipped with a heater, thermometer, temperature sensor, sliding flange, linear guide rail, and a cooling and shaping air ring installed above the fourth traction 14. 15. The air ring is equipped with a fan. A stable bubble holder is installed above the air duct and air ring 15.
16. Fixed on auxiliary frame 12. The auxiliary frame is divided into 2 layers. A lifting traction frame is installed above the stable foam rack corresponding to the first floor platform.
17. Installation of traction frame for the 5th traction.
18. Herringbone board.
19. Lifting screw rod.
20. Along with the lifting motor, the second platform above the traction frame is equipped with a neutral space for easy film movement. The second platform is equipped with a pneumatic swing arm frame.
21. The swing arm frame is installed with guide rollers, sensors, steering devices, cylinders, and pneumatic swing arm frame connected to the 6th traction frame.
22. The traction system is equipped with lifting screws.
23. Motor and herringbone board.
24. Install an external infrared radiation heating oven on the first platform below the traction frame.
25. The oven adopts a stacked segmented structure for easy transportation and disassembly, and is equipped with an electrical control cabinet.
26. Install 2 cooling air rings below the heater and oven.
27. Used for cooling thin films, the air ring is installed on a bracket and can move freely. It is equipped with 2 independent fans and air ducts, and a single station automatic winding machine is placed under the first level platform corresponding to the air ring.
28. The bottom of the winding machine is equipped with a frame frame.
29. Box frame installation of rotary gear disc.
30. Fixed winding machine platform with rotating gear disc.
31. Install a winding machine on the platform.
32. Rotating motors.
33. The winding machine is equipped with guide rollers, flying knives, inflation shafts, flipping frames, translation, unloading, and a 7th traction track above the winding machine.
34. Traction installation of herringbone plate adjustment bracket.
35. The bottom of the rewinder is equipped with a conductive ring for 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.
Editor:Sichuan Jinzhongde Science and Technology Research Institute
