阅读说明：本技术 一种塑料薄膜吹膜装置以及制备方法 (Plastic film blowing device and preparation method ) 是由 陈全明 王静 于 2020-04-30 设计创作，主要内容包括：本发明公开了一种塑料薄膜吹膜装置,设置于吹膜机的风环上方,包括：喷纤环,用于在吹膜机生成的膜体内表面生成纤维网,喷纤环设置于吹膜机的风环上方,并水平设置在由风环托扶的膜体的内圈,喷纤环的沿其周向设置有多个喷头,喷头用以朝向膜体的内表面喷射纤维丝,喷头的轴线与膜体的内表面倾斜；加热环,用于对膜体以及覆盖在其内表面的纤维网加热,加热环设置于喷纤环的上方,并环设在膜体的外圈；喷气环,用于向膜体内部输送气流,喷气环设置于风环的上方,并至少朝向加热环的内圈方向输送气流,喷气环沿其周向均匀设置有若干出气孔。该装置能够快速装入现有的吹膜机设备中,设备改动小,兼容性高,改造成本低。(The invention discloses a plastic film blowing device, which is arranged above a wind ring of a film blowing machine and comprises: the fiber spraying ring is used for generating a fiber net on the inner surface of a film body generated by the film blowing machine, the fiber spraying ring is arranged above a wind ring of the film blowing machine and horizontally arranged on an inner ring of the film body supported by the wind ring, a plurality of spray heads are arranged along the circumferential direction of the fiber spraying ring, the spray heads are used for spraying fiber yarns towards the inner surface of the film body, and the axes of the spray heads are inclined to the inner surface of the film body; the heating ring is used for heating the membrane body and the fiber net covered on the inner surface of the membrane body, is arranged above the fiber spraying ring and is annularly arranged on the outer ring of the membrane body; the air injection ring is used for conveying air flow to the inside of the membrane body, arranged above the air ring and at least used for conveying air flow towards the inner ring direction of the heating ring, and is uniformly provided with a plurality of air outlets along the circumferential direction. The device can be quickly installed in the existing film blowing machine equipment, the equipment is small in change, the compatibility is high, and the modification cost is low.)

1. The utility model provides a plastic film blown film device, sets up in blown film machine's wind ring top, its characterized in that includes:

the fiber spraying ring is arranged above the wind ring of the film blowing machine and horizontally arranged at the inner ring of the film body supported by the wind ring, a plurality of spray heads are arranged along the circumferential direction of the fiber spraying ring, the spray heads are used for spraying fiber filaments towards the inner surface of the film body, and the axis of each spray head is inclined to the inner surface of the film body;

the heating ring is used for heating the membrane body and the fiber net covered on the inner surface of the membrane body, is arranged above the fiber spraying ring and is annularly arranged on the outer ring of the membrane body;

the air injection ring is used for conveying air flow to the inside of the membrane body, the air injection ring is arranged above the air ring and at least faces towards the inner ring direction of the heating ring to convey air flow, and a plurality of air outlet holes are uniformly formed in the air injection ring along the circumferential direction of the air injection ring.

2. A plastic film blowing apparatus according to claim 1, wherein an angle between an axis of said blowing head and a horizontal plane is 30 ° to 60 °.

3. A plastic film blowing apparatus according to claim 1, wherein said fiber spraying ring includes a first ring body and a second ring body, and the nozzles on the first ring body and the nozzles on the second ring body are arranged alternately.

4. The plastic film blowing device according to claim 1, wherein a rod body is arranged at a center position of a die head of the film blowing machine, and the fiber spraying ring and the gas spraying ring are connected with the rod body.

5. A plastic film blowing apparatus according to claim 1, wherein said air blowing ring is located on the same plane as said heating ring and delivers the air flow in a radial direction of said heating ring.

6. A plastic film blowing apparatus according to claim 1, wherein an inner ring of said heating ring is provided with a copper plate.

7. A plastic film blowing apparatus according to claim 1, wherein said blowing head is a melt blowing head, and said melt blowing head includes a blowing head and at least one air jet head provided to be attached to a side of said blowing head.

8. A plastic film blowing machine comprises a blowing machine body and is characterized by further comprising the plastic film blowing device according to any one of claims 1 to 7, wherein the plastic film blowing device is arranged above a wind ring of the blowing machine body.

9. A plastic film manufacturing method using the plastic film blowing machine according to claim 8, characterized by comprising the steps of:

s1, starting the film blowing machine body and the fiber spraying ring, and covering the fiber net on the inner surface of the film body;

s2, starting the heating ring, controlling the temperature of the heating ring to be 70-100 ℃, and heating the membrane body and the fiber net covered on the inner surface of the membrane body;

s3 activates the heating ring and simultaneously activates the gas injection ring to deliver a gas flow outwardly at a fixed frequency.

10. The method for preparing according to claim 9, characterized by comprising the steps of: and adjusting the staggered angle of the spray heads on the first ring body and the second ring body of the fiber spray ring according to production requirements.

Technical Field

The invention relates to the technical field of film blowing machines and plastic film preparation, in particular to a plastic film blowing device and a preparation method thereof.

Background

The film blowing machine is a plastic film processing device, and mainly heats and melts plastic particles and then blows the plastic particles into a film. The traditional film blowing machine mainly comprises an extruder, a die head, an air ring, a herringbone conveying belt, a traction roller mechanism and the like, dry polyethylene particles are added into a lower hopper, enter a screw rod from the hopper by the weight of the particles, when granules are contacted with inclined edges of threads, the rotating inclined edges generate thrust perpendicular to the inclined edges on plastics, the plastic particles are pushed forwards, in the pushing process, due to the friction between the plastics and the screw rod and between the plastics and a machine barrel and the collision friction between the plastics and the particles, the molten plastics are gradually dissolved by heating outside the material barrel, the molten plastics are filtered by a machine head to remove impurities, come out from a die head die orifice, are cooled by the air ring and blown by the herringbone conveying belt, and are coiled to roll finished films into a barrel.

The conventional plastic film is of a single-layer film body structure, a multi-layer structure plastic film is also provided at present, but the preparation process is relatively complex, the plastic film is separated from the film body forming, the two types are mainly adopted, one type is to prepare the film body firstly, then glue is coated on the surface of the film body, and finally another layer of material (such as formed non-woven fabric) is compounded on the film body. Particularly, the first method can not be compounded on the cylindrical membrane body, and the second method can only be compounded outside the cylindrical membrane body, and the compounding has gaps. Therefore, it is necessary to provide a further solution to the above problems.

Disclosure of Invention

The invention aims to provide a plastic film blowing device and a preparation method thereof, which aim to overcome the defects in the prior art.

In order to solve the technical problems, the technical scheme of the invention is as follows:

the utility model provides a plastic film blown film device, sets up in the wind ring top of blown film machine, includes:

the fiber spraying ring is arranged above the wind ring of the film blowing machine and horizontally arranged at the inner ring of the film body supported by the wind ring, a plurality of spray heads are arranged along the circumferential direction of the fiber spraying ring, the spray heads are used for spraying fiber filaments towards the inner surface of the film body, and the axis of each spray head is inclined to the inner surface of the film body;

the heating ring is used for heating the membrane body and the fiber net covered on the inner surface of the membrane body, is arranged above the fiber spraying ring and is annularly arranged on the outer ring of the membrane body;

the air injection ring is used for conveying air flow to the inside of the membrane body, the air injection ring is arranged above the air ring and at least faces towards the inner ring direction of the heating ring to convey air flow, and a plurality of air outlet holes are uniformly formed in the air injection ring along the circumferential direction of the air injection ring.

Preferably, the axis of the nozzle head is at an angle of 30-60 ° to the horizontal.

Preferably, the fiber spraying ring comprises a first ring body and a second ring body, and the spray heads on the first ring body and the spray heads on the second ring body are arranged in a staggered manner.

Preferably, a rod body is arranged at the center of the die head of the film blowing machine, and the fiber spraying ring and the air spraying ring are connected with the rod body.

Preferably, the gas injection ring and the heating ring are located on the same plane, and the gas flow is conveyed along the radial direction of the heating ring.

Preferably, the inner ring of the heating ring is provided with a copper plate.

Preferably, the spray head is a melt-blowing head, and the melt-blowing head comprises a spray head and at least one air nozzle attached to the side edge of the spray head.

Preferably, the fiber-ejecting ring ejects polypropylene fibers toward the inner surface of the membrane body.

Preferably, the first ring and the second ring are relatively rotatable.

Preferably, the first ring body and the second ring body are rotatably connected with the rod body.

Preferably, the first ring and the second ring have a difference in radius.

Preferably, the second annulus is located within the first annulus.

Preferably, the intersection points of the nozzle axis on the first ring body and the nozzle axis on the second ring body and the inner surface of the membrane body are located in the same plane.

Preferably, the fiber spraying ring is connected with a fiber mixing box, and a stirring rod is arranged in the fiber mixing box.

Preferably, spout fine ring with be provided with the back taper guide block between the wind ring, the guide block with the body of rod is connected.

Preferably, the heating temperature of the heating ring is in the range of 70-100 ℃.

Preferably, the air injection ring sprays lubricating powder outwards.

The invention also provides a plastic film blowing machine, which comprises a film blowing machine body and a plastic film blowing device, wherein the plastic film blowing device is arranged above the air ring of the film blowing machine body.

The invention also provides a preparation method of the plastic film, which comprises the following steps:

s1, starting the film blowing machine body and the fiber spraying ring, and covering the fiber net on the inner surface of the film body;

s2, starting the heating ring, controlling the temperature of the heating ring to be 70-100 ℃, and heating the membrane body and the fiber net covered on the inner surface of the membrane body;

s3 activates the heating ring and simultaneously activates the gas injection ring to deliver a gas flow outwardly at a fixed frequency.

Preferably, the method comprises the following steps: and adjusting the staggered angle of the spray heads on the first ring body and the second ring body of the fiber spray ring according to production requirements.

Compared with the prior art, the invention has the beneficial effects that:

(1) according to the invention, the fiber spraying ring is arranged in the film body through the device, so that the fiber net layer is formed on the inner surface of the film body, and the film body and the fiber net layer are basically and synchronously molded, so that the production time is greatly shortened, the cost is reduced, the compounding degree of the film body and the fiber net layer is improved, the production of a composite plastic film is realized, the outer layer realizes good elasticity and sealing property through the film body, and the inner layer realizes high strength and good wear resistance through the fiber net layer; and the device can be quickly installed in the existing film blowing machine equipment, the equipment change is small, the compatibility is high, and the modification cost is low.

(2) According to the invention, the fiber spraying ring nozzle is obliquely arranged, so that a fiber mesh layer can be formed on the inner surface of the membrane body, and meanwhile, the fiber spraying ring nozzle has certain transverse blowing and supporting effects on the membrane body, thereby facilitating the expansion of the membrane body, enlarging the radial size of the membrane body and reducing the subsequent thermal shrinkage influence.

(3) According to the invention, the combination of the membrane body and the fiber mesh layer covering the inner surface of the membrane body is further deepened through the heating ring, so that the membrane body and the fiber mesh layer are more tightly attached.

(4) According to the invention, the transverse attachment of the membrane body and the fiber net layer is more compact through the matching of the air injection ring and the heating ring, and the dynamic infiltration process of the membrane body to the interior of the fiber net layer is realized through the synergistic effect of air flow pushing of the air injection ring and good thermal ductility of the membrane body, so that the composite degree and the composite uniformity of the membrane body and the fiber net layer are improved; furthermore, the dynamic infiltration effect is improved by controlling the regularity of the air injection ring, so that the compounding degree and the compounding uniformity of the air injection ring and the air injection ring are further improved.

(5) According to the invention, the inner surface of the membrane body is selectively covered with the fiber net through the first ring body and the second ring body, and the fiber net can be covered on the inner surface of the membrane body in an all-round manner through adjusting the staggered angle of the spray heads on the first ring body and the second ring body, and the coverage uniformity of the fiber net is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a perspective view of the present invention;

FIG. 2 is an enlarged partial perspective view of the present invention with the heating ring omitted;

FIG. 3 is an enlarged perspective view of FIG. 2;

FIG. 4 is a schematic top view of the fiber injection ring of FIG. 3;

FIG. 5 is an enlarged partial perspective view of the present invention, wherein a heating ring is included.

Specifically, 1-a film body,

10-a film blowing machine body, 11-a die head, 12-a wind ring, 13-an extruder,

20-fiber spraying ring, 21-nozzle, 211-material spraying head, 212-gas spraying head, 22-first ring body, 23-second ring body, 24-material guiding pipe, 25-gas guiding pipe,

30-heating ring, 31-copper plate,

40-an air injection ring, 41-an air outlet,

50-the rod body is arranged on the rod body,

60-guide block, 61-through hole.

Detailed Description

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 only a part of the embodiments of the present invention, and not all of the embodiments. 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.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the invention, the meaning of "a plurality" is two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

As shown in fig. 1, a plastic film blowing apparatus is provided above a wind ring 12 of a film blowing machine to form a web layer on an inner surface of a film body 1 produced by the film blowing machine. The plastic film blowing apparatus includes a fiber spraying ring 20, a heating ring 30, and an air spraying ring 40. The device can be quickly installed in the existing film blowing machine equipment, the equipment is small in change, the compatibility is high, and the modification cost is low.

As shown in fig. 1-3, the fiber spraying ring 20 is used for generating a fiber web on the inner surface of the film body 1 generated by the film blowing machine, and the fiber spraying ring 20 is arranged above the wind ring 12 of the film blowing machine and horizontally arranged at the inner ring of the film body 1 supported by the wind ring 12. In the conventional arrangement, the cooling stage of the film body 1 is substantially perpendicular to the horizontal plane, so that the radial direction of the fiber injection ring 20 is parallel to the radial direction of the film body 1. Through the device at the inside fibre ring 20 that spouts that sets up of the membrane body 1, realized forming the fibre web layer at the 1 internal surface of membrane body, membrane body 1 and the basic synchronous forming of fibre web layer simultaneously, greatly shortened the production time, the cost is reduced, the compound degree of membrane body 1 with the fibre web layer has been improved simultaneously, composite plastic film production has been realized, good elasticity and leakproofness are realized through membrane body 1 to the skin, high strength and good wearability have been realized through the fibre web layer to the inlayer.

Specifically, as shown in fig. 2, the fiber spraying ring 20 is provided with a plurality of spraying heads 21 along its circumferential direction, and the spraying heads 21 are used to spray the fiber filaments toward the inner surface of the film body 1. Further, the axis of the nozzle 21 is inclined with the inner surface of the film body 1, and the nozzle 21 which is obliquely arranged can form a fiber net layer on the inner surface of the film body 1, and has certain transverse blowing and upward supporting effects on the film body 1, so that the film body 1 is favorably expanded, the radial size of the film body 1 is enlarged, and the subsequent thermal contraction influence is reduced. Through a plurality of experimental screens, the included angle between the axis of the spray head 21 and the horizontal plane is preferably 30-60 degrees.

Of course, as shown in fig. 2 and 3, the fiber spraying ring 20 is connected with a material guiding pipe 24 and an air guiding pipe 25, and especially, when the melt spraying head 21 is used, the fiber raw material is torn and formed by high-speed air flow. The guide duct 24 and the air guide duct 25 may communicate with the outside by providing perforations on the die 11.

As shown in fig. 5, the heating ring 30 is used for heating the film body 1 and the fiber net layer covering the inner surface thereof to further deepen the combination of the film body 1 and the fiber net layer covering the inner surface thereof, so that the film body 1 and the fiber net layer are more tightly attached, the layer separation is not easy to occur, and the middle void phenomenon is reduced. Specifically, the heating ring 30 is disposed above the fiber spraying ring 20 and is annularly disposed on the outer ring of the film body 1. Preferably, the inner ring of the heating ring 30 is provided with a copper plate 31 to achieve high thermal conductivity, and the copper plate 31 can be heated by an electric heater, and heat radiation is generated in the inner ring space to heat the film body 1 and the fiber mesh layer covered thereon.

As shown in fig. 2 and 5, the air injection ring 40 is used for delivering air flow to the inside of the membrane body 1, and the air injection ring 40 is disposed above the air ring 12 and delivers air flow at least toward the inner ring direction of the heating ring 30. Realize that the laminating of membrane body 1 and fibre web layer on transversely is inseparabler through the cooperation of gas injection ring 40 and heating ring 30, promote and the good hot ductility synergism of membrane body 1 through gas injection ring 40 air current for membrane body 1 presents the dynamic infiltration process to fibre web layer inside, improves compound degree and the compound degree of consistency between them. Meanwhile, the dynamic infiltration effect can be improved by regularly controlling the air injection ring 40, so that the composite degree and the composite uniformity of the air injection ring and the air injection ring are further improved. Specifically, the air injection ring 40 is uniformly provided with a plurality of air outlets 41 along the circumferential direction, the aperture of each air outlet 41 is 2-5 cm, the air outlets 41 are uniformly distributed on the circumferential direction of the air injection ring 40, and generally 1-3 circles are arranged along the height direction of the air injection ring 40. Preferably, the air injection ring 40 can be further sprayed with lubricating powder to the outside, and the lubricating powder is adhered to the surface of the fiber mesh layer to prevent the inside of the film belt from being adhered in the subsequent rolling process.

According to a preferred embodiment of the present invention, as shown in fig. 2 and 3, the fiber spraying ring 20 comprises a first ring body 22 and a second ring body 23, and the spraying heads 21 on the first ring body 22 and the spraying heads 21 on the second ring body 23 are arranged alternately. The inner surface of the film body 1 is selectively covered with the fiber net through the first ring body 22 and the second ring body 23, the fiber net can be covered on the inner surface of the film body 1 in all directions through adjusting the staggered angle of the spray heads 21 on the first ring body 22 and the second ring body 23, the covering uniformity of the fiber net is improved, the strip-shaped fiber net can be formed on the inner surface of the film body 1, and various composite structure plastic films are realized. In this embodiment, as shown in fig. 2, the nozzles 21 on the first ring 22 and the nozzles 21 on the second ring 23 are uniformly spaced, so as to cover the fiber web on the inner surface of the membrane 1 in all directions, and the fiber web is overlapped by two layers of fiber filaments in a staggered manner, so as to supplement the thinner edge of the fiber block sprayed by a single nozzle 21 of a single ring, improve the thickness uniformity of the whole fiber web, and improve the strength. Certainly, the nozzles 21 on the first ring body 22 and the nozzles 21 on the second ring body 23 may be unevenly distributed at intervals, that is, the nozzles 21 on the first ring body 22 and the nozzles 21 on the second ring body 23 may be close to each other, and even, the nozzles 21 on the first ring body 22 and the nozzles 21 on the second ring body 23 are located in the same plane, so as to realize the generation of the ribbon-shaped fiber web on the inner surface of the film body 11, and meet various arrangement requirements, further, the axes of the nozzles 21 on the first ring body 22 and the axes of the nozzles 21 on the second ring body 23 have an intersection point, and the intersection point is located on the inner surface of the film body 1, so as to realize the synchronous molding of the fiber web blocks sprayed by the two rings, and improve the overall molding effect of the fiber web layer. Meanwhile, different fiber raw materials can be respectively communicated through the first ring body 22 and the second ring body 23, the fiber nets made of different materials can be simultaneously covered on the inner surface of the film body 1, and various performance requirements are met.

The first ring 22 and the second ring 23 are preferably capable of relative rotation to adjust the distance between the spray heads 21. The first frame body and the second frame body are respectively connected with a material guide pipe 24 and an air guide pipe 25, the material guide pipe 24 and the air guide pipe 25 adopt flexible hoses, and a certain length is reserved for rotating along with the first frame body or the second frame body.

The first ring body 22 and the second ring body 23 have a radius difference by which the blockage of the ring body to the injection korean route of the injection head 21 is avoided and the spray effect is improved. It is further preferred that the second ring 23 is located within the first ring 22, i.e., the first ring 22 and the second ring 23 are located substantially in the same plane.

According to a preferred embodiment of the present invention, the intersection points of the axes of the nozzles 21 on the first ring body 22 and the axes of the nozzles 21 on the second ring body 23 and the inner surface of the film body 1 are located in the same plane, so as to realize the synchronous molding of the fiber mesh blocks sprayed by the two rings and improve the overall molding effect of the fiber mesh layer.

According to a preferred embodiment of the present invention, as shown in fig. 2, a rod 50 is disposed at the center of the die head 11 of the film blowing machine, and the fiber-ejecting ring 20 and the gas-ejecting ring 40 are connected to the rod 50 to be fixed inside the film body 1. The gas flow passages of the gas injection ring 40 may be provided inside the rod body 50 to save space. Preferably, the fiber-spraying ring 20 is connected to the rod 50 by a plurality of struts to reduce weight, typically 3 struts uniformly arranged along the inner circumference of the fiber-spraying ring 20. In this embodiment, the first ring 22 and the second ring 23 are connected to the rod 50 through a plurality of struts. And, in order to realize the rotation of the first ring 22 and the second ring 23, the first ring 22 and the second ring 23 are rotatably connected with the rod 50. That is, 2 rotation shafts can be sleeved on the rod 50, and the first rod 50 and the second rod 50 are respectively connected with the corresponding rotation shafts.

According to a preferred embodiment of the present invention, as shown in fig. 1, an inverted cone-shaped guide block 60 is disposed between the fiber-blowing ring 20 and the air ring 12, and the guide block 60 is connected to the rod 50 to perform outward directed expansion of the primary film body 1 extruded from the die 11 and blow-molded. Further, the guide block 60 is provided with a through hole 61 for the passage of the guide tube 24 and the air guide tube 25.

According to a preferred embodiment of the present invention, as shown in fig. 4, the nozzle 21 is a melt nozzle 21, and the melt nozzle 21 includes a nozzle 211 and at least one nozzle 212 disposed adjacent to a side of the nozzle 211, and the two nozzles are generally symmetrically disposed to tear and form the fiber material by high-speed air flow. Further, the fiber spraying ring 20 sprays polypropylene fibers towards the inner surface of the film body 1, the polypropylene fibers are main raw materials for preparing non-woven fabrics, the strength and the wear resistance of the plastic film are enhanced through a non-woven fabric fiber net, the service life is prolonged, and the package of specific objects is met. Of course, other fiber materials can be used to make the fiber web, or a mixture of multiple fiber materials can be used to make the fiber web. Meanwhile, the fiber spraying ring 20 can be connected with a fiber mixing box, and a stirring rod is arranged in the fiber mixing box to prevent the fiber from settling, agglomerating and the like to influence the fiber web forming effect. An air flow pipe can be further arranged at the inner bottom of the fiber mixing box, and the fiber settling, agglomeration and the like are prevented from influencing the fiber net forming effect through air flow stirring.

According to a preferred embodiment of the present invention, as shown in fig. 5, the gas injection ring 40 is located on the same plane as the heating ring 30 and delivers a gas flow in the radial direction of the heating ring 30 to enhance the combination of the membrane body 1 and the fiber web layer covering the inner surface of the membrane body 1 to the area.

According to a preferred embodiment of the present invention, the heating ring 30 is heated at a temperature ranging from 70 to 100 ℃. Further, the heating ring 30 is disposed a long distance along the membrane body 1 for sufficient recombination, typically with a heating ring 30 height of 50-120 cm and a heating ring 30 radial distance of 50-70 cm from the membrane body 1.

As shown in fig. 1, a plastic film blowing machine comprises a blowing machine body 10 and further comprises the plastic film blowing device, wherein the plastic film blowing device is arranged above a wind ring 12 of the blowing machine body 10. The extruder 13, the die 11 and the air ring 12 connected in sequence in the film blowing machine body 10 are schematically shown. Of course, it is understood that the film blowing machine body 10 should also include other parts of the existing film blowing machine equipment, such as a blanking hopper arranged in front of the extruder 13, a herringbone conveyor belt arranged above the wind ring 12 for flattening the cylindrical film body 1, and a pull roll mechanism, a winding mechanism, a motor, etc. This application is through setting up in the top of current wind ring 12 and spouting fine ring 20, heating ring 30 and jet-propelled ring 40, realized forming fiber web layer at 1 internal surface of the membrane body, membrane body 1 and fiber web layer basic synchronization shaping simultaneously, the production time has greatly been shortened, the cost is reduced, the compound degree of the membrane body 1 with fiber web layer has been improved simultaneously, composite plastic film production has been realized, good elasticity and leakproofness are realized through membrane body 1 to the skin, the inlayer has realized high strength and good wearability through fiber web layer.

Of course, as mentioned above, the fiber-spraying ring 20 and the air-spraying ring 40 are fixed by the rod 50, which is not described in detail herein. The heating ring 30 is erected above the film blowing machine body 10 through a frame body, and the frame body can be flexibly arranged according to the situations such as the field. The frame body can be erected on the ground or hung on the frame of the film blowing machine body 10.

The invention also provides a preparation method of the plastic film, which comprises the following steps:

s1, the inflation film manufacturing machine body 10 and the fiber spraying ring 20 are started, and the fiber net is covered on the inner surface of the film body 1.

S2, starting the heating ring 30, controlling the temperature of the heating ring 30 to be 70-100 ℃, and heating the membrane body 1 and the fiber net covered on the inner surface of the membrane body to realize the better combination of the two.

S3 starting the heating ring 30 and the air-jet ring 40, delivering air flow outwards at a fixed frequency, realizing the closer transverse attachment of the membrane body 1 and the fiber web layer, presenting a dynamic infiltration process to the interior of the fiber web layer through the good thermal extensibility of the membrane body 1, and improving the composite degree and the composite uniformity of the two.

In order to realize the high temperature state during the primary forming of the film body 1, the fiber spraying ring 20 is preferably arranged adjacent to the air ring 12 to spray the primary formed film body 1, so that the bonding strength of the film body and the air ring is improved, and the subsequent stable forming process is not influenced.

According to a preferred embodiment of the present invention, the preparation method comprises the steps of: the staggered angle of the spray heads 21 on the first ring body 22 and the second ring body 23 of the fiber spray ring 20 is adjusted according to production requirements.

In conclusion, the fiber spraying ring is arranged in the film body through the device, so that the fiber net layer is formed on the inner surface of the film body, and the film body and the fiber net layer are basically and synchronously formed, the production time is greatly shortened, the cost is reduced, the compounding degree of the film body and the fiber net layer is improved, the production of a composite plastic film is realized, the outer layer realizes good elasticity and sealing performance through the film body, and the inner layer realizes high strength and good wear resistance through the fiber net layer; and the device can be quickly installed in the existing film blowing machine equipment, the equipment change is small, the compatibility is high, and the modification cost is low.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.