CN114347423A - Multi-layer core multi-direction rotating film blow molding method and device - Google Patents
Multi-layer core multi-direction rotating film blow molding method and device Download PDFInfo
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- CN114347423A CN114347423A CN202111676745.6A CN202111676745A CN114347423A CN 114347423 A CN114347423 A CN 114347423A CN 202111676745 A CN202111676745 A CN 202111676745A CN 114347423 A CN114347423 A CN 114347423A
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- 238000000071 blow moulding Methods 0.000 title claims abstract description 49
- 239000000155 melt Substances 0.000 claims abstract description 46
- 230000007246 mechanism Effects 0.000 claims description 23
- 230000009471 action Effects 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 238000001125 extrusion Methods 0.000 claims description 9
- 230000007704 transition Effects 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 5
- 239000010410 layer Substances 0.000 abstract description 90
- 229920000642 polymer Polymers 0.000 abstract description 9
- 239000002356 single layer Substances 0.000 abstract description 4
- 238000000465 moulding Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 238000010008 shearing Methods 0.000 description 4
- 238000004804 winding Methods 0.000 description 4
- 238000013329 compounding Methods 0.000 description 3
- 210000004907 gland Anatomy 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000009941 weaving Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000010096 film blowing Methods 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 229920006255 plastic film Polymers 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The invention discloses a multi-layer core multi-direction rotating film blow molding method and a multi-layer core multi-direction rotating film blow molding device. The device comprises an inner layer rotary core, a middle layer rotary core and an outer layer rotary core. The inner layer rotary mold core and the outer layer rotary mold core rotate in the same direction, and the middle layer rotary mold core rotates in the opposite direction; the polymer melt enters an outer annular runner formed by the outer rotary core and the middle rotary core through a melt channel on the outer die body and the outer rotary core, enters an inner annular runner between the middle rotary core and the inner rotary core through a melt channel on the middle rotary core, converges at the top of the middle rotary core through melts of the inner and outer annular runners and forms an annular cross-sectional film blank uniformly flowing in the circumferential direction through a die opening, and the film blank is drawn, blown and rolled, so that the blow molding of a film with a woven orientation structure is realized. The problem of the transverse and longitudinal performance of the blown film is uneven is solved, and the problem of film curling of a single-layer rotating film caused by unbalanced residual stress around the middle plane of the film is also avoided.
Description
Technical Field
The invention relates to the technical field of plastic film processing, in particular to a multi-layer core multi-direction rotating film blow molding method and a multi-layer core multi-direction rotating film blow molding device.
Background
With the development of the plastic chemical industry, the application of plastic films in daily life is more and more extensive, and the blow molding is widely applied to the field of film production due to the characteristics of no waste film, high film utilization rate, wide film thickness adjusting range and the like. The blow molding is to extrude viscous-state melt after being melted and plasticized by an extruder through a die head annular runner to prepare a cylindrical film blank, then blow compressed air into the film blank to blow the film blank, and simultaneously pull and cool the film blank, and finally wind the film blank into a film product. However, in the blow molding process of the traditional blow molding device, the annular flow passage gap of the die head is unstable, and the thickness of the film is easy to be uneven; when the polymer melt passes through the annular runner, molecular chains are directionally arranged along the axial direction due to the axial velocity gradient, so that the finally obtained film has anisotropy, and the circumferential strength is obviously lower than the axial strength. Such anisotropy is more pronounced for polymers containing rigid molecular structures, and may even affect the normal production and processing of the film, and the resulting film may not be satisfactory for practical engineering applications.
The rotary blow molding is needed to solve the problems of unstable annular runner gap, film anisotropy and the like in the blow molding production process. The rotary blow molding utilizes the annular shearing action in the annular flow channel to promote the molecular chains to be arranged along the circumferential direction before being extruded out of the die head, and the property of the film tends to be uniform by regulating the molecular arrangement sequential property through adjusting the parameters such as the rotating speed of the mandrel, the traction speed and the like. The utility model with application number 202020181229.0 discloses a film blowing die head with rotary orientation of a die, which extrudes a film by means of the reverse rotation of an outer die ring and an inner die core which are concentrically arranged at the die. The patent application No. 202010818966.1 discloses a rotary die head for film formation, a film forming apparatus and a film forming method, which extrude a film by the reverse rotation of the inner wall and the outer wall of an annular extrusion pipeline. However, the single-layer film produced by the rotational blow molding has the effect of the reverse rotation on the melt, and the top orientation direction of the film is perpendicular to the bottom orientation direction, so that unbalanced residual stress is generated around the middle plane of the film in the film cooling process, and the film is curled, thereby affecting the practical engineering application.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a multi-layer core multidirectional-rotation film blow molding method which is simple in principle, easy to control and excellent in film comprehensive performance, improves the gap stability of an annular flow channel in the blow molding process, reduces the anisotropy of a film prepared by rigid molecular chain polymer blow molding, avoids the film curling phenomenon of a single-layer rotation film due to unbalanced residual stress around the middle plane of the film, realizes the direct compounding of a plurality of layers of rotation films, and obtains a flat film product with a weaving orientation structure, uniform in thickness and uniform in longitudinal and transverse properties.
It is another object of the present invention to provide a multi-core multi-direction rotating film blow molding apparatus for carrying out the above method.
In order to realize the aim of the invention, the multi-layer core multi-direction rotating film blow molding device is characterized by comprising an outer mold body, an inner layer rotating core, a middle layer rotating core and an outer layer rotating core, wherein the rotating core and the outer mold body jointly form a mold head, each part of the mold head is nested along the extrusion direction of a film blank from large to small according to the diameter size, and the inner layer rotating core is provided with an air channel penetrating through the whole core along the axial direction;
the inner layer rotary core, the middle layer rotary core and the outer layer rotary core are coaxially and rotatably arranged in the outer mold body, when the outer layer rotary core and the inner layer rotary core rotate in the same direction, the middle layer rotary core rotates in the reverse direction,
a gap is reserved between the inner layer rotary core and the middle layer rotary core in the radial direction to form an inner ring runner, a gap is reserved between the middle layer rotary core and the outer layer rotary core in the radial direction to form an outer ring runner, the inner ring runner is communicated with the outer ring runner, and the height of the middle layer rotary core is lower than that of the inner layer rotary core and that of the outer layer rotary core so that a gap is reserved between the outer layer rotary core and the inner layer rotary core.
The inner layer, the middle layer and the outer layer rotary cores are concentrically arranged and are provided with gaps in the radial direction to form an inner annular flow channel and an outer annular flow channel, the melt in the inner annular flow channel is subjected to the incongruous rotary shearing action of the inner layer and the middle layer rotary cores along with the multidirectional rotation of the multilayer rotary cores, and the melt in the outer annular flow channel is subjected to the incongruous rotary shearing action of the middle layer and the outer layer rotary cores.
And one end of the melt pump transition section is connected with the outer die body, and the other end of the melt pump transition section is used for being connected with the extruder.
Furthermore, melt channels are radially formed in the middle-layer rotary mold core and the outer-layer rotary mold core.
Further, the melt passages on the middle rotary core and the outer rotary core are located at the same height. So set up for the fuse-element can get into outer annular runner and interior annular runner more continuously smoothly.
Further, still include the gland on the die head, the gland sets up above the die body on the die head.
Further comprises a fixed die connecting seat, a motor and a gear transmission mechanism driven by the motor, wherein the gear transmission mechanism comprises an external gear mechanism and a single-row double-stage planetary gear mechanism,
the single-row two-stage planetary gear mechanism comprises an outer gear ring, a planet carrier and a sun gear, the outer gear ring is fixedly connected with the outer mold body through a fixed mold connecting seat, the planet carrier is fixedly connected with the outer layer rotary mold core, and the sun gear is fixedly connected with the middle layer rotary mold core;
the external gear mechanism comprises a driving gear and a driven gear which is connected with the driving gear in a meshed mode, the driving gear is connected with an output shaft of the motor, and the driven gear is fixedly connected with the inner layer rotary core and connected with a planet carrier of the single-row double-stage planetary gear mechanism.
The rotary core is driven by a single motor through a multi-layer gear transmission mechanism, the driving gear is connected with the motor to realize power input, the driven gear is fixedly connected with the inner rotary core and is connected with a planet carrier of the single-row double-stage planetary gear mechanism, so that the planet carrier is driven to rotate to realize the homodromous rotation of the inner rotary core and the outer rotary core, and the planet carrier rotates to simultaneously drive the sun gear to rotate, so that the reverse rotation of the middle rotary core is realized.
Further, the top of the middle rotary core is tapered.
The invention also provides a multi-layer core multi-direction rotating film blow molding method, which comprises the following steps:
sequentially connecting a melt conveying unit, an extrusion unit and a traction unit, wherein the extrusion unit adopts a multi-layer core multi-direction rotating film blow molding device as claimed in any one of claims;
the melt conveying unit conveys the material to the multi-layer core multi-direction rotating film blow molding device after fully melting and plasticizing, and the melt sequentially carries out an outer annular flow passage and an inner annular flow passage;
the melts passing through the outer annular runner and the inner annular runner are converged at the top of the middle layer rotary core under the pressure flow action in the direction of the die orifice and form an annular section die blank which uniformly flows in the circumferential direction through a gap between the outer layer rotary core and the inner layer rotary core;
the film blank leaving from the gap between the outer layer rotary core and the inner layer rotary core is pulled upwards under the action of a pulling unit, and simultaneously air enters the film blank through an air channel in the inner layer rotary core to blow the film blank;
and flattening the blown film blank to obtain the film.
According to the method provided by the invention, the melts in the inner and outer annular runners are subjected to annular shear stress in opposite directions by utilizing the multidirectional rotary motion of the multi-layer rotary mold core, the melts are converged by pressure flow in the direction of the mold opening and form an annular cross-section film blank which uniformly flows in the circumferential direction through the mold opening, and further the blow molding of the film with a weaving orientation structure is realized.
Furthermore, the traction unit comprises a herringbone plate and a traction roller, the traction roller is used for traction of the film blanks, and the herringbone plate is used for flattening the blown film blanks.
Further, the traction unit also comprises a winding device, and the winding device is used for winding the flattened film into a cylinder.
Compared with the prior art, the invention at least has the following beneficial effects:
(1) the continuous circumferential shearing action is generated among the rotary cores through the rotary motion, the orientation of polymer molecular chains in the circumferential direction before being extruded out of a die head is promoted, the molecular arrangement sequential property is regulated and controlled through adjusting the parameters such as the rotating speed and the traction speed of the cores, the anisotropy of a film during the blow molding of rigid molecular chain polymers is reduced, in the rotary extrusion process of the rotary cores, the inner layer and the outer layer of a film blank are subjected to the axial stress action and the circumferential stress applied by the rotation of the rotary cores, the resultant force direction of the circumferential stress is not the axial direction of the film blank but a certain angle with the film blank, therefore, the orientation direction of the molecular chains deviates from the axial direction, the circumferential strength and the axial strength tend to be consistent, the anisotropy is weakened, and the performance tends to be isotropic;
(2) the film blank is extruded by rotating each rotary core, so that the melt in the annular flow channel is uniformly distributed in the circumferential direction, the stability of the gap of the annular flow channel in the blow molding process is improved, the thickness of the obtained film blank is uniform, and the thickness uniformity of a film product is improved;
(3) the single motor drives the multi-layer mold core to rotate in multiple directions, so that the use cost is reduced;
(4) the direct compounding of the multilayer rotary film is realized through the multilayer annular melt flow channel among the multilayer rotary cores, the process difficulty is reduced, and the curling phenomenon of the single-layer rotary film is avoided.
Drawings
FIG. 1 is a schematic view of the molding apparatus.
FIG. 2 is a schematic view of the structure of the die section of the molding apparatus.
FIG. 3 is a schematic view of the apparatus structure of the molding apparatus applied to a blown film process.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the multi-layer core multi-direction rotating film blow molding apparatus provided by the present invention includes an inner layer rotating core 6, a middle layer rotating core 5, an outer layer rotating core 4, an outer mold body 16, a die head upper gland 3, a melt pump transition section 15, a fixed mold connecting seat 14, a bearing and a gear transmission mechanism. The rotary cores and the outer die body 16 jointly form a die head, and all parts of the die head are nested along the extrusion direction of the film blank from large to small according to the diameter size.
In some embodiments of the invention, the upper die cover 3 is disposed above the outer die body 16 so as to mount a bearing in the outer die body 16 to provide support for the outer rotary core 4 and improve its rotational stability; one end of the melt pump transition section 15 is fixedly connected with the outer wall of the outer die body 16, and the other end of the melt pump transition section is used for being connected with an extruder, so that the plasticized melt enters a die head for molding; the fixed die connecting seat 14 is connected with the outer gear ring 13 through bolts, so that the outer gear ring 13 is fixed and support is provided for the installation of the outer die body 16.
In some embodiments of the present invention, the inner rotary core 6, the middle rotary core 5, and the outer rotary core 4 are coaxially and rotatably disposed in the outer mold body 16, and the outer rotary core 4, the middle rotary core 5, and the inner rotary core 6 are sequentially disposed from outside to inside, wherein when the outer rotary core 4 and the inner rotary core 6 rotate in the same direction, the middle rotary core 5 rotates in the opposite direction, so that the annular shear stresses applied to the melt in the inner and outer annular flow passages are in opposite directions.
In some embodiments of the invention, the top of the middle layer rotary core 5 is gradually tapered, and the heights of the middle layer rotary core 5 are lower than those of the inner layer rotary core 6 and the outer layer rotary core 4, so that melts subjected to hoop shear stress in opposite directions in the inner ring runner 2 and the outer ring runner 1 can be smoothly converged at the top of the middle layer rotary core 5, direct compounding of a plurality of layers of rotary films is realized in a melt state, oriented superposition in the thickness direction is realized, residual stress existing around the middle plane of the obtained film is balanced in a statistical sense, and the film is prevented from curling.
In some embodiments of the present invention, the inner rotary core 6, the middle rotary core 5, and the outer rotary core 4 are concentrically arranged with gaps in the radial direction to form an inner annular runner 2 and an outer annular runner 1, and the outer annular runner 1 is communicated with the melt pump transition section 15 through a radial circular runner on the outer mold body 16; the middle parts of the outer layer rotary mold core 4 and the middle layer rotary mold core 5 are both provided with radial melt channels and are positioned at the same height, so that the melt can continuously and smoothly enter the outer annular flow passage 1 and the inner annular flow passage 2; the inner rotary core 6 is internally designed with air passages through the entire core so that compressed air can be let into the film blank to inflate it.
In the invention, a gear transmission mechanism driven by a motor drives the inner layer rotary mold core 6 and the outer layer rotary mold core 4 to rotate in the same direction, and simultaneously drives the middle layer rotary mold core 5 to rotate in the opposite direction. The rotary core is fixedly connected with the gear and is hard-supported by the bearing.
In some of the embodiments of the present invention, the gear train is a multi-stage gear train including an external gear mechanism and a single row dual stage planetary gear mechanism. An outer gear ring 13 of the single-row double-stage planetary gear mechanism is fixedly connected with a fixed die connecting seat 14 through a bolt, a planet carrier 10 is fixedly connected with an outer layer rotary core 4, and a sun gear 9 is fixedly connected with a middle layer rotary core 5. A driving gear 7 of the external gear mechanism positioned below the fixed die connecting seat 14 is connected with a motor to realize power input; the driven gear 8 is fixedly connected with the inner rotary core 6 and is connected with a planet carrier 10 of the single-row double-stage planetary gear mechanism, so that the planet carrier 10 is driven to rotate, and the co-rotation of the inner rotary core 6 and the outer rotary core 4 is realized. The planet carrier 10 rotates while driving the sun gear 9 to rotate, thereby realizing the reverse rotation of the middle rotary core 5.
Through the multi-layer core multidirectional-rotation film blow molding device provided by the embodiment, polymer melt from the melt conveying unit enters the outer annular runner 1 formed by the outer layer rotary core 4 and the middle layer rotary core 5 through the melt channel arranged in the middle of the outer mold body and the outer layer rotary core, and continues to enter the inner annular runner 2 between the middle layer rotary core 5 and the inner layer rotary core 6 through the melt channel arranged in the middle of the middle layer rotary core 5, the melt passing through the inner and outer annular runners is converged at the top of the middle layer rotary core 5 and forms an annular cross-section film blank uniformly flowing in the circumferential direction through a mold opening, and then the film blank is pulled, blown and rolled, so that the blow molding of a film with a woven orientation structure is realized. Wherein, the fuse-element of interior annular runner 2 and outer annular runner 1 of bringing into is because the hoop shear stress direction that receives is just opposite, under die orifice direction pressure flow effect, orientation contained angle about 90 will be formed to interior outer layer polymer fuse-element molecular chain, can form the film that has the orientation structure of weaving through blow molding, the transverse performance of film has been promoted by a wide margin, can effectively solve the uneven problem of the horizontal and vertical performance of blown film, also can avoid the rotatory film of individual layer simultaneously because there is the film problem that unbalanced residual stress leads to around the midplane of film to curl.
In some embodiments of the invention, a method of film blow molding using the multi-core multi-direction rotary film blow molding apparatus is also provided.
The molding device in the previous embodiment is applied to blow molding, and as shown in fig. 3, the device comprises a melt conveying unit, an extrusion unit and a traction unit which are connected in sequence; the melt conveying unit is a single-screw extruder 19 and is connected with a melt pump transition section 15 in a multi-layer core multi-direction rotating film blow molding device, the extruding unit is the multi-layer core multi-direction rotating film blow molding device, and the traction unit comprises a herringbone plate 18, a traction roller 17 and a winding device; the melt conveying unit and the traction unit are both made of corresponding equipment in the traditional film blowing process.
In the blow molding process, the single-screw extruder 19 fully melts and plastifies the materials and then conveys the materials to the multi-layer core multi-direction rotating film blow molding device; then, polymer melt from a single screw extruder 19 enters an outer annular runner 1 formed by the outer rotary core 4 and the middle rotary core 5 through a melt channel arranged in the middle of the die body and the outer rotary core 4, and continues to enter an inner annular runner 2 between the middle rotary core 5 and the inner rotary core 6 through a melt channel arranged in the middle of the middle rotary core 5, and the melt passing through the inner annular runner 2 and the outer annular runner 1 is converged at the top of the middle rotary core 5 under the pressure flow action in the die opening direction and forms an annular section die blank uniformly flowing in the circumferential direction through a gap between the outer rotary core 4 and the inner rotary core 6, namely the die opening; the film blank leaving from the die orifice is pulled upwards under the action of a pulling roll 17, and simultaneously, compressed air enters the film blank through an air channel in the inner layer rotating core 6 so as to blow the film blank, and then the film blank is flattened by a herringbone plate 18 and finally wound into a cylinder to obtain a film product with uniform and flat thickness.
As mentioned above, the present invention can be better realized, and the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention: all equivalent changes and modifications made according to the present disclosure are intended to be covered by the scope of the claims of the present invention.
Claims (10)
1. The multi-layer core multi-direction rotating film blow molding device is characterized by comprising an outer mold body (16), an inner layer rotating core (6), a middle layer rotating core (5) and an outer layer rotating core (4), wherein an air channel is formed in the inner layer rotating core (6) along the axis direction;
the inner layer rotary core (6), the middle layer rotary core (5) and the outer layer rotary core (4) are coaxially and rotatably arranged in the outer die body (16), and when the outer layer rotary core (4) and the inner layer rotary core (6) rotate in the same direction, the middle layer rotary core (5) rotates in the opposite direction;
a gap is reserved between the inner layer rotary core (6) and the middle layer rotary core (5) in the radial direction to form an inner ring runner (2), a gap is reserved between the middle layer rotary core (5) and the outer layer rotary core (4) in the radial direction to form an outer ring runner (1), the inner ring runner (2) is communicated with the outer ring runner (1), and the height of the middle layer rotary core (5) is lower than that of the inner layer rotary core (6) and that of the outer layer rotary core (4) so that a gap is reserved between the outer layer rotary core (4) and the inner layer rotary core (6).
2. A multi-core multi-turn film blow molding apparatus according to claim 1, further comprising a melt pump transition section (15), the melt pump transition section (15) having one end connected to the outer mold body (16) and another end for connection to a melt transfer unit.
3. The multi-layer core multi-direction rotating film blow molding device according to claim 1, wherein the middle layer rotating core (5) and the outer layer rotating core (4) are both provided with a melt channel in the radial direction.
4. A multi-core multi-rotating film blow molding apparatus according to claim 3, wherein the melt channels on the middle rotating core (5) and the outer rotating core (4) are located at the same height.
5. A multi-core multi-turn film blow molding apparatus according to claim 1, further comprising a die upper cover (3), the die upper cover (3) being disposed above the outer mold body (16).
6. The multi-layer core multi-direction rotating film blow molding device according to claim 1, further comprising a fixed mold connecting seat (14), a motor and a gear transmission mechanism driven by the motor, wherein the gear transmission mechanism comprises an external gear mechanism and a single-row double-stage planetary gear mechanism,
the single-row double-stage planetary gear mechanism comprises an outer gear ring (13), a planet carrier (10) and a sun gear (9), the outer gear ring (13) is fixedly connected with an outer die body (16) through a fixed die connecting seat (14), the planet carrier (10) is fixedly connected with an outer layer rotary core (4), and the sun gear (9) is fixedly connected with a middle layer rotary core (5);
the external gear mechanism comprises a driving gear (7) and a driven gear (8) meshed with the driving gear (7), the driving gear (7) is connected with an output shaft of the motor, and the driven gear (8) is fixedly connected with the inner rotary core (6) and connected with a planet carrier (10) of the single-row double-stage planetary gear mechanism.
7. A multi-core multi-rotating film blow-molding apparatus according to any of claims 1 to 6, wherein the top of the middle rotating core (5) is tapered.
8. A method of blow molding a multi-core multi-spin film comprising the steps of:
sequentially connecting a melt conveying unit, an extrusion unit and a traction unit, wherein the extrusion unit adopts a multi-layer core multi-direction rotating film blow molding device as claimed in any one of claims 1 to 7;
the melt conveying unit fully melts and plastifies the materials and conveys the materials to the multi-layer core multi-direction rotating film blow molding device, and the melt sequentially carries out an outer annular flow passage (1) and an inner annular flow passage (2);
the melts passing through the outer annular runner (1) and the inner annular runner (2) are converged at the top of the middle layer rotary mold core (5) under the pressure flow action in the mold opening direction, and form an annular section mold blank uniformly flowing in the circumferential direction through a gap between the outer layer rotary mold core (4) and the inner layer rotary mold core (6);
the film blank leaving from the gap between the outer layer rotary core (4) and the inner layer rotary core (6) is pulled upwards under the action of a pulling unit, and simultaneously air enters the film blank through an air channel in the inner layer rotary core (6) to blow the film blank;
and flattening the blown film blank to obtain the film.
9. The multilayer core multidirectional rotation film blow molding method according to claim 8, wherein the drawing unit comprises a herringbone plate (18) and a drawing roller (17), the drawing roller (17) is used for drawing the film blank, and the herringbone plate (18) is used for flattening the blown film blank.
10. A method of blow molding a multi-core multi-turn film according to any of claims 8-9, wherein the take-up unit further comprises a take-up device for taking up the flattened film into a roll.
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Application publication date: 20220415 |