CN-122008520-A - Seven-layer co-extrusion film blowing machine set and production process thereof

CN122008520ACN 122008520 ACN122008520 ACN 122008520ACN-122008520-A

Abstract

The application belongs to the technical field of seven-layer film production, in particular to a seven-layer co-extrusion film blowing machine set and a production process thereof, wherein the seven-layer co-extrusion film blowing machine set comprises a plasticizing device, a filtering device, a foam tube forming device, a folding device and a winding device, the filtering device comprises a shell component, a filter screen component and a driving component, the shell component is provided with an annular groove, a first pipeline which is radially arranged along the annular groove, and a second pipeline which is communicated with the side part of the first pipeline, and the filter screen component comprises an annular cylinder body which is matched with the annular groove, and a plurality of meshes which are circumferentially arranged on the annular cylinder body. The application utilizes the filtered fluid to carry out back flushing on the net sheet, thereby saving the manual cleaning step on one hand, avoiding the pollution of the melted raw materials caused by the adhesion of the rest flushing medium on the filter screen on the other hand, and being beneficial to improving the production quality of the film.

Inventors

Yin Hongnuan
PAN JIARONG
WEI LINLI

Assignees

广东福瑞杰新材料有限公司

Dates

Publication Date: 20260512
Application Date: 20260408

Claims (10)

1. Seven layers of coextrusion film blowing units, including plasticizing device, filter equipment, bubble pipe forming device, folding device and coiling mechanism, plasticizing device passes through filter equipment with bubble pipe forming device is connected, is used for continuously providing molten raw materials, folding device can radially act on bubble pipe, be used for rolling out the film, the coiling mechanism is used for rolling up the film, its characterized in that, filter equipment includes housing assembly, filter screen subassembly and drive assembly, housing assembly has seted up the ring channel, along the first pipeline of ring channel radial arrangement and with the second pipeline of the lateral part switch-on of first pipeline, the other end of second pipeline with bubble pipe forming device switch-on, one end of first pipeline runs through the ring channel and its terminal shaping goes out the feed section, the other end runs through the ring channel and its terminal shaping drain section, the filter screen subassembly includes with ring channel looks adaptation's annular barrel and circumference are listed on the annular barrel a plurality of net piece, be equipped with movable in the first pipeline, drive assembly with annular ring channel and a plurality of drive flashboard when opening the ring channel, can be communicated with the external world when a plurality of ring channel and a plurality of ring channel are opened.
2. The seven-layer coextrusion film blowing unit according to claim 1, further comprising a workbench and a turntable bearing, wherein the housing assembly comprises a connected circular ring housing and a cylindrical housing, the cylindrical housing is arranged along the radial direction of the circular ring housing, the annular groove is formed in the circular ring housing, the first pipeline and the second pipeline respectively start on the cylindrical housing, the turntable bearing comprises an inner ring body and an outer ring body which are rotatably connected, the outer ring body is arranged at the top of the workbench and is connected with the annular cylinder body through the inner ring body, a supporting frame is arranged at the top of the workbench, and the supporting frame is connected with the cylindrical housing and can provide a supporting force for the circular ring housing to hang above the outer ring body in the vertical direction.
3. The seven-layer coextrusion film blowing unit according to claim 2, wherein the inner side surface of the inner ring body is convexly provided with convex teeth in annular arrangement, the driving assembly comprises a motor arranged on the workbench, a main shaft of the motor is provided with a gear, and the gear is meshed with the convex teeth for transmission.
4. The seven-layer coextrusion film blowing unit according to claim 1, wherein the annular cylinder is provided with notches corresponding to the mesh sheet along the circumferential direction, a plurality of the notches are arranged at equal intervals and have equal arc lengths, and the mesh sheet is concave and convex arc-shaped and is fixed with the notches through welding.
5. The seven-layer co-extrusion film blowing machine set according to claim 4, wherein the mesh sheet comprises a matrix layer, a supporting layer, a filter layer and a transition level protection layer which are stacked in sequence, and the outer side of the protection layer faces the inner port of the feeding section or the inner port of the blowdown section.
6. The seven-layer coextrusion film blowing unit according to claim 2, further comprising a cylinder, a cylinder block disposed on the table, a piston rod of the cylinder being connected to the gate, the cylindrical housing being provided with a vertical chute in sliding engagement with the gate.
7. The seven-layer coextrusion film blowing unit according to claim 2, wherein a pair of first arc-shaped grooves are concavely formed in the outer ring side wall of the annular groove, the pair of first arc-shaped grooves are symmetrically arranged by taking the cylindrical shell as a symmetry axis, first sealing steps are convexly arranged at the end parts of the pair of first arc-shaped grooves, and the first sealing steps are in sealing contact with the outer side surface of the annular cylinder.
8. The seven layer coextrusion film blowing unit according to claim 7, wherein a heating assembly is disposed within the first arcuate groove.
9. A production process of a seven-layer co-extrusion film blowing unit, characterized in that the seven-layer co-extrusion film blowing unit according to any one of claims 1 to 8 is adopted, comprising the following steps: (S1) preparing materials, namely taking raw material particles corresponding to a composite layer of a film product, and respectively putting the raw material particles into seven groups of plasticizing devices; (S2) forming a tube blank, wherein molten raw materials of all layers enter a co-extrusion blow molding die head of the bubble tube forming device through the filtering device and the second pipeline of the filtering device, and extruding the raw materials into a cylindrical tube blank through the co-extrusion blow molding die head; (S3) bubble tube forming, namely providing traction force for the cylindrical tube blank, and sequentially passing through a wind ring, a bubble stabilizer, the folding device and the winding device of the bubble tube forming device, wherein compressed air is blown in along the inner diameter direction of the cylindrical tube blank through the wind ring in the process, so that the cylindrical tube blank is expanded and stretched along the radial direction to prepare the bubble tube; (S4) folding and forming, wherein the folding device utilizes a pair of included angle plates gradually decreasing along the conveying direction of the bubble tube to fold and act on the bubble tube along the radial direction of the bubble tube so as to prepare a film; And (S5) coiling and blanking, wherein the film is guided and pulled by a plurality of roller shafts and coiled into a coiling device to finish film blanking.
10. The production process according to claim 9, further comprising: (S1-1) mesh replacement, namely gradually reducing the rotating speed of the plasticizing device until the internal pressure of the plasticizing device is within 1Mpa, driving the annular cylinder to rotate in the annular groove by the driving component, driving the mesh of the second station in the circumferential direction to turn around until the mesh is aligned with the feeding section in the radial direction, and then gradually increasing the rotating speed of the plasticizing device; (S1-2) back flushing the mesh sheet, repeating the above step (S1-1) until the mesh sheet of the nth station is aligned with the feeding section and the mesh sheet of the first station is aligned with the blowdown section in the radial direction, first by opening the shutter plate on the first pipe so that the feeding section is connected with the blowdown section in the radial direction, then gradually increasing the rotation speed of the plasticizing device, outputting a part of molten raw material filtered by the mesh sheet of the nth station to the co-extrusion blow molding die head of the bubble tube forming device through the second pipe, and the other part of the molten raw material flows to the inner surface of the filter screen of the first station along the first pipe, and finally discharging and recovering impurities on the outer surface of the mesh sheet of the first station by back flushing the filtered molten raw material through the blowdown section.

Description

Seven-layer co-extrusion film blowing machine set and production process thereof Technical Field The invention belongs to the technical field of seven-layer film production, and particularly relates to a seven-layer co-extrusion film blowing machine set and a production process thereof. Background The seven-layer co-extrusion film blowing machine set is an industrial device for forming a multi-layer functional film by co-extrusion and compounding plastic particles with different performances in a molten state through a plurality of extruders. In the prior art, as in the chinese published invention application CN202510104766.2, a seven-layer co-extrusion greenhouse film blowing machine set is disclosed, which comprises an extrusion plasticizing machine, a filtering device, a seven-layer composite mold forming machine, a blowing cooling shaping device, a foam stabilizing device, a clamping plate, an upper traction device, a guide roller, a lower traction device and a winding device, wherein the impurity attachment rate of a filter screen in the filtering device increases with the production time, in order to improve the net changing efficiency in the market at present, a manual net changer (porous plate) or an automatic net changer (mesh belt) is generally adopted to realize the connection between the extruder and a co-extrusion die head, a filter screen of the manual net changer (porous plate) is fixedly arranged on an alloy porous plate, the switching of a filtering station is realized through a breaking handle, the filter screen of the automatic net changer (mesh belt) is a long mesh belt, the working principle of the machine adopts water cooling sealing, the starting and stopping of a heating rod and the switching of cooling water are automatically controlled by a control system, the filter screen is driven to move, the net changing is realized without stopping the net changing, but the structure still has the following defects that (1) the manual net changer needs to manually monitor the melt pressure in real time to judge whether the need to change the melt pressure, and the net changing needs to be done when the pressure needs to be changed in the new net (mesh filter screen) and the new net needs to be made when the net changing is needed to be changed in the pressure, especially a new net (mesh is needed to be made when the net changing is a new net, and the net is needed to be a new when the net is required to be changed when a net (a net is a new net) to be required to be a high), and a high-changed), and a high-saving film is especially a high-quality film is produced, and a high-saving film is especially has a high cost film is produced, and a high production film, and a film is produced, a film has a film, a film has a high production film. Disclosure of Invention The invention aims to provide a seven-layer co-extrusion film blowing unit, and aims to solve the technical problems of high labor cost and high production cost in the prior art. In order to achieve the above purpose, the seven-layer coextrusion film blowing unit provided by the embodiment of the invention comprises a plasticizing device, a filtering device, a foam tube forming device, a folding device and a rolling device, wherein the plasticizing device is connected with the foam tube forming device through the filtering device and is used for continuously providing molten raw materials, the folding device can radially act on the foam tube and is used for folding out films, the rolling device is used for rolling up the films, the filtering device comprises a shell component, a filter screen component and a driving component, the shell component is provided with an annular groove, a first pipeline radially arranged along the annular groove and a second pipeline communicated with the side part of the first pipeline, the other end of the second pipeline is communicated with the foam tube forming device, one end of the first pipeline penetrates through the annular groove, the tail end of the first pipeline penetrates through the annular groove, the other end of the first pipeline penetrates through the annular groove, the tail end of the first pipeline forms a sewage draining section, the filter screen component comprises an annular cylinder which is matched with the annular groove, a plurality of meshes are circumferentially arranged on the annular cylinder, the first pipeline is internally provided with the first pipeline, a movable mesh sheet is arranged along the annular groove, and the annular shutter plate can be communicated with the annular shutter plate through the annular shutter plate when the annular shutter plate is opened, and the driving section is communicated with the outside through the annular shutter plate. Optionally, still include workstation and carousel bearing, the casing subassembly is including ring casing and the column casing of connection, the column casing is followed the radial direction of ring casing is