阅读说明：本技术 一种复合塑料薄膜吹膜机以及制备方法 (Composite plastic film blowing machine and preparation method thereof ) 是由 陈全明 王静 于 2020-04-30 设计创作，主要内容包括：本发明公开了一种复合塑料薄膜吹膜机,包括吹膜机本体；喷纤环,用于在吹膜机本体生成的膜体外表面生成纤维网,喷纤环设置于吹膜机本体的风环上方,并环设在由风环托扶的膜体的外圈；加热环,用于对膜体以及覆盖在其外表面的纤维网加热,加热环设置于喷纤环的上方,并环设在膜体的外圈；负压环,用于抽排一区域内气流产生负压,负压环设置于风环的上方,并至少覆盖加热环的外圈。本发明通过喷纤环实现膜体与纤维网层基本同步成型,极大地缩短了生产时间,降低了成本,同时提高了膜体与纤维网层的复合程度,实现了双层塑料薄膜生产,外层通过纤维网层实现了高强度和良好的耐磨度,内侧通过膜体实现良好的弹性和密封性。(The invention discloses a composite plastic film blowing machine, which comprises a blowing machine body; the fiber spraying ring is used for generating a fiber net on the outer surface of a film body generated by the film blowing machine body, is arranged above the wind ring of the film blowing machine body and is annularly arranged on the outer ring of the film body supported by the wind ring; the heating ring is used for heating the membrane body and the fiber net covered on the outer surface of the membrane body, is arranged above the fiber spraying ring and is annularly arranged on the outer ring of the membrane body; and the negative pressure ring is used for pumping the air flow in one area to generate negative pressure, is arranged above the air ring and at least covers the outer ring of the heating ring. The invention realizes the basic synchronous molding of the film body and the fiber net layer through the fiber spraying ring, greatly shortens the production time, reduces the cost, improves the compounding degree of the film body and the fiber net layer, realizes the production of the double-layer plastic film, realizes high strength and good wear resistance of the outer layer through the fiber net layer, and realizes good elasticity and sealing property of the inner side through the film body.)

1. The utility model provides a composite plastic film inflation film manufacturing machine, includes the inflation film manufacturing machine body, its characterized in that still includes:

the fiber spraying ring is used for generating a fiber net on the outer surface of a film body generated by the film blowing machine body, the fiber spraying ring is arranged above the wind ring of the film blowing machine body and annularly arranged on the outer ring of the film body supported by the wind ring, a plurality of spray heads are arranged on the inner ring of the fiber spraying ring and used for spraying fiber yarns towards the outer surface of the film body, and the axis of each spray head is vertical to the surface of the film body;

the heating ring is used for heating the membrane body and the fiber net covered on the outer 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 negative pressure ring is used for pumping and exhausting air flow in an area to generate negative pressure, the negative pressure ring is arranged above the air ring and at least covers the outer ring of the heating ring, and the inner ring of the negative pressure ring is provided with a plurality of air exhaust holes.

2. The composite plastic film blowing machine as claimed in claim 1, wherein the fiber spraying ring comprises a first ring body and a second ring body which are stacked up and down, and the nozzles on the first ring body and the nozzles on the second ring body are staggered.

3. The composite plastic film blowing machine as claimed in claim 1, wherein the negative pressure ring is disposed at an outer ring of the heating ring.

4. The composite plastic film blowing machine as claimed in claim 1, wherein the diameter of the plurality of suction holes is adjustable.

5. The film blowing machine of claim 1, wherein the inner ring of the heating ring is provided with a copper plate.

6. The composite plastic film blowing machine as claimed in claim 1, wherein said nozzle is a melt nozzle, said melt nozzle comprises a nozzle head and at least one air nozzle attached to a side of said nozzle head.

7. The film blowing machine of claim 1, wherein the fiber injection ring injects polypropylene fibers toward the outer surface of the film body.

8. A plastic film manufacturing method using the composite plastic film blowing machine according to any one of claims 1 to 7, 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 outer 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 outer surface of the membrane body;

s3 the heating ring is started and the negative pressure ring is started at the same time, so as to control the increase and decrease of the air pressure in the area with a fixed frequency.

9. The method for preparing according to claim 8, 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.

10. The composite plastic film comprises a film body and is characterized in that a fiber net layer covers the outer surface of the film body, and the film body and the fiber net layer are synchronously formed.

Technical Field

The invention relates to the technical field of film blowing machines and plastic film preparation, in particular to a composite plastic film blowing machine 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. Therefore, it is necessary to provide a further solution to the above problems.

Disclosure of Invention

The invention aims to provide a composite plastic film blowing machine 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 composite plastic film inflation film manufacturing machine, includes the inflation film manufacturing machine body, still includes:

the fiber spraying ring is used for generating a fiber net on the outer surface of a film body generated by the film blowing machine body, the fiber spraying ring is arranged above the wind ring of the film blowing machine body and annularly arranged on the outer ring of the film body supported by the wind ring, a plurality of spray heads are arranged on the inner ring of the fiber spraying ring and used for spraying fiber yarns towards the outer surface of the film body, and the axis of each spray head is vertical to the surface of the film body;

the heating ring is used for heating the membrane body and the fiber net covered on the outer 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 negative pressure ring is used for pumping and exhausting air flow in an area to generate negative pressure, the negative pressure ring is arranged above the air ring and at least covers the outer ring of the heating ring, and the inner ring of the negative pressure ring is provided with a plurality of air exhaust holes.

Preferably, the fiber spraying ring comprises a first ring body and a second ring body which are stacked up and down, 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, the negative pressure ring is arranged on the outer ring of the heating ring.

Preferably, the hole diameter of a plurality of the pumping holes can be adjusted.

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 outer surface of the film body.

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

Preferably, the height of the negative pressure ring at least extends from the fiber spraying ring to the heating ring.

Preferably, the aperture of the extraction hole of the negative pressure ring is gradually reduced from bottom to top along the height direction.

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

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 outer 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 outer surface of the membrane body;

s3 the heating ring is started and the negative pressure ring is started at the same time, so as to control the increase and decrease of the air pressure in the area with 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.

The invention also provides a composite plastic film which comprises a film body, wherein the outer surface of the film body is covered with a fiber net layer, and the film body and the fiber net layer are synchronously formed.

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

(1) according to the invention, the fiber spraying ring is used for realizing the basic synchronous molding of the film body and the fiber net layer, 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 high strength and good wear resistance through the fiber net layer, and the inner side realizes good elasticity and sealing performance through the film body; and the fiber spraying ring 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) The invention realizes further deepening the compounding of the membrane body and the fiber mesh layer covering the outer surface of the membrane body through the heating ring, so that the membrane body is more tightly jointed with the fiber mesh layer.

(3) According to the invention, the transverse attachment of the film body and the fiber net layer is more compact through the matching of the negative pressure ring and the heating ring, and a dynamic infiltration process is presented to the interior of the fiber net layer through the good thermal extensibility of the film body, so that the compounding degree and the compounding uniformity of the film body and the fiber net layer are improved; furthermore, the dynamic infiltration effect is improved by regularly controlling the negative pressure ring, so that the compounding degree and the compounding uniformity of the negative pressure ring and the negative pressure ring are further improved.

(4) According to the invention, the negative pressure ring is used for forming the negative pressure area around the membrane body, so that the expansion of the membrane body is facilitated, the radial size of the membrane body is enlarged, and the subsequent thermal contraction influence is reduced.

(5) According to the invention, the fiber net is selectively covered on the outer surface of the membrane body through the fiber spraying ring with the double-ring structure, and the fiber net can be covered on the outer 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 a schematic view, partially in section, of the present invention;

FIG. 3 is an enlarged perspective view of a fiber injection ring according to the present invention;

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

FIG. 5 is an enlarged perspective view of the heating ring of the present invention;

fig. 6 is an enlarged perspective view of the negative pressure ring of the present invention.

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, 22-first ring body, 23-second ring body, 24-material guiding pipe, 25-gas guiding pipe,

30-heating ring, 31-copper plate,

40-negative pressure ring, 41-air extraction hole and 42-air extraction pipe.

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 and 2, a composite plastic film blowing machine comprises a blowing machine body 10, a fiber spraying ring 20 arranged above the blowing machine body 10, a heating ring 30 and a negative pressure ring 40. 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 negative pressure ring 40, realized in quick to original individual layer plastic film production facility, produce composite plastic film on the convenient ground basis that reforms transform, compatibility is high, reform transform with low costs, and this composite plastic film's the external surface of membrane covers there is the fibre web layer, the membrane body is with fibre web layer synchronous forming, the outer layer has realized high strength and good wearability through the fibre web layer, inboard good elasticity and leakproofness are realized through the membrane body 1, a novel plastic film is provided.

Of course, spout fine ring 20, heating ring 30 and negative pressure ring 40 and erect in inflation film manufacturing machine body 10 top through the support body, and the support body setting can be according to the nimble setting of circumstances such as place. The frame body can be erected on the ground or hung on the frame of the film blowing machine body. The fiber spraying ring 20 is connected with a material guide pipe 24 and an air guide pipe 25, and fiber raw materials are subjected to tearing forming through high-speed air flow particularly when a melt spraying head is used. The negative pressure ring 40 is connected with exhaust tube 42, and special exhaust tube 42 sets up a plurality ofly, generally is 3 to comparatively evenly arrange in the circumference of negative pressure ring 40, in order to form comparatively even negative pressure environment.

As shown in fig. 2, the fiber spraying ring 20 is disposed above the wind ring 12 of the film blowing machine body 10 and is annularly disposed on the outer ring of the film body 1 supported by the wind ring 12 to form a fiber web on the outer surface of the film body 1 generated by the film blowing machine body 10. Through spouting fine ring 20 setting, realized the basic synchronous molding of membrane body 1 with the fibre stratum reticulare, greatly shortened production time, the cost is reduced has improved the compound degree of membrane body 1 with the fibre stratum reticulare simultaneously. Specifically, as shown in fig. 3, the inner ring of the fiber spraying ring 20 is provided with a plurality of spray heads 21 to spray the fiber filaments toward the outer surface of the film body 1. Further, the axis of the shower head 21 is perpendicular to the surface of the membrane body 1, i.e., the axis of the shower head 21 coincides with the radial direction of the membrane body 1, and it is understood that this perpendicular arrangement allows for a certain mounting error. The short-distance internal spinning is realized by vertically spinning through the nozzle 21, and the spinning effect is easy to control. The nozzles 21 are generally uniformly arranged in the circumferential direction of the inner ring of the fiber-spraying ring 20 by 5-8.

As shown in fig. 2 and 5, 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 to heat the film body 1 and the fiber web sprayed on the outer surface of the film body by the fiber spraying ring 20, so as to further enhance the combination of the film body 1 and the fiber web, so that the film body 1 and the fiber web are more tightly attached to each other, the separation of layers is not easy to occur, and the hollow phenomenon in the middle is reduced. Preferably, the inner ring of the heating ring 30 is provided with a copper plate 31 to achieve a high thermal conductivity, the copper plate 31 may be heated by an electric heater in general, and heat radiation is generated in the inner ring space thereof to heat the membrane body 1 and the fiber mesh covered thereon.

As shown in fig. 2 and 6, the negative pressure ring 40 is disposed above the wind ring 12 and covers at least an outer ring of the heating ring 30 to exhaust the airflow in an area to generate negative pressure. Specifically, the inner ring of the negative pressure ring 40 is provided with a plurality of air extraction holes 41, the aperture of each air extraction hole 41 is 2-5 cm, the air extraction holes 41 are uniformly distributed in the inner ring of the negative pressure ring 40, and generally 3-6 circles are arranged along the height direction of the negative pressure ring 40. Through negative pressure ring 40 to the outside decompression of the diaphragm body 1 with the inside inflation of the diaphragm body 1 in coordination, on the one hand, further promote the expansion of the diaphragm body 1, enlarge the radial dimension of the diaphragm body 1, reduce the influence of subsequent thermal contraction, on the other hand, it is inseparabler to realize that the laminating of the diaphragm body 1 and fiber web layer on transversely is inseparabler, presents dynamic infiltration process to the fiber web layer inside through the good heat extensibility of the diaphragm body 1, improves compound degree and the compound degree of consistency between them.

In this embodiment, the negative pressure ring 40 covers the filament spraying ring to the heating ring 30, i.e. the height of the negative pressure ring 40 extends from the filament spraying ring 20 to the heating ring 30. Preferably, the aperture of the air exhaust hole 41 of the negative pressure ring 40 is gradually reduced from bottom to top along the height direction, so as to gradually enhance the pressure reduction effect and improve the dynamic infiltration effect. Of course, in order to reduce the influence on the filaments sprayed by the spinneret ring, the negative pressure ring 40 may be arranged only on the outer ring of the heating ring 30 to improve the compounding degree of the film body 1 and the fiber web. Furthermore, the change of the dynamic infiltration rate can be realized by regularly controlling the negative pressure ring 40, namely, the interval control of the pumping intensity, so that the dynamic infiltration effect is improved, and the composite degree and the composite uniformity of the negative pressure ring and the negative pressure ring are further improved.

According to a preferred embodiment of the present invention, as shown in fig. 3 and 4, the fiber spraying ring 20 includes a first ring body 22 and a second ring body 23 which are stacked up and down, the spraying heads 21 on the first ring body 22 and the spraying heads 21 on the second ring body 23 are staggered, that is, the fiber spraying ring 20 with a double-ring structure selectively covers the outer surface of the film body 1 with the fiber web, and the staggered angle of the spraying heads 21 on the first ring body 22 and the second ring body 23 is adjusted, so that the fiber web can be covered on the outer surface of the film body 1 in all directions, the coverage uniformity of the fiber web is improved, and the fiber web can be formed on the outer surface of the film body 1 in a strip shape, thereby realizing various plastic films with composite structures. Relative rotation can be realized to first ring body 22 and second ring body 23 to adjust distance between shower nozzle 21 between them, when specifically externally setting up the support body, the support body is the annular, first ring body 22 and second ring body 23 can set up the slider at the outer lane, with support body inner circle sliding connection, first support body 22 and second support body 23 can be respectively at the inside horizontal rotation of support body, and, this moment, preferably, the lower bottom surface of first support body 22 and the last bottom surface of second support body 23 laminate basically, of course, it can be understood that leave certain space between first support body 22 and the second support body 23 in order to realize mutual no influence rotation. The first frame body 22 and the second frame body 23 are respectively connected with a material guiding pipe 24 and an air guiding pipe 25, the material guiding pipe 24 and the air guiding pipe 25 adopt flexible hoses, and a certain length is reserved for rotating along with the first frame body 22 or the second frame body 23.

In one embodiment, as shown in fig. 4, 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 outer surface of the membrane body 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 overlapped in height, so that the generation of the strip-shaped fiber web on the outer surface of the membrane body 1 is realized, and various arrangement requirements are met. Simultaneously, can also communicate different fiber raw materials respectively through first ring body 22 and second ring body 23, realize covering the fibre web of different materials simultaneously at the external surface of membrane body 1, satisfy multiple performance demand.

According to a preferred embodiment of the present invention, the aperture of the plurality of pumping holes 41 can be adjusted to adjust the pressure by adjusting the aperture of the pumping holes 41. The aperture of the air exhaust hole 41 can be adjusted by arranging an annular cavity along the inner circumference of the air exhaust hole 41, and the cavity is inflated by conveying fluid to the annular cavity, so as to reduce the aperture of the air exhaust hole 41. Of course, an annular expansion piece may be provided in the circumferential direction of the air extraction hole. Preferably, the cavity control is adopted, and the fluid, such as air flow, is used for realizing more convenient and stable control.

According to a preferred embodiment of the present invention, the nozzle 21 is a melt blowing nozzle, and the melt blowing head includes a jet head and at least one jet head disposed to be adjacent to a side of the jet head, and two jet heads are disposed generally symmetrically to tear and form the fiber material by high-speed air flow. Further, the fiber spraying ring 20 sprays polypropylene fibers towards the outer 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, 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.

The invention also discloses 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 outer surface of the film body 1.

Wherein, the inner ring of the fiber spraying ring 20 is provided with a plurality of spray heads 21 to spray fiber filaments towards the outer surface of the membrane body 1. Further, the axis of the head 21 is perpendicular to the surface of the film body 1, and of course, the perpendicular arrangement allows for a certain mounting error. The short-distance internal spinning is realized by vertically spinning through the nozzle 21, and the spinning effect is easy to control. Generally adopt polypropylene fiber raw materials preparation fibre web, simultaneously, with this cooperation, shower nozzle 21 can adopt to melt the shower nozzle, including spouting stub bar and laminating promptly spout at least one air jet that stub bar side set up, generally the symmetry sets up two to tear the shaping through high velocity air to fiber raw materials. The fiber spraying ring 20 sprays polypropylene fibers towards the outer 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.

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 outer surface of the membrane body to realize better compounding of the two.

S3 starts the heating ring 30 and simultaneously starts the negative pressure ring 40, controls the increase and decrease of the air pressure in the area with a fixed frequency, realizes that the film body 1 is attached to the fiber net layer in the transverse direction more tightly, and shows a dynamic infiltration process to the inside of the fiber net layer through the good thermal extensibility of the film body 1, thereby improving the composite degree and the composite uniformity of the film body and the fiber net layer.

In order to realize the high-temperature state during the primary forming of the membrane body, the fiber spraying ring is preferably arranged adjacent to the wind ring, the primary formed membrane body is sprayed, the bonding force of the primary formed membrane body and the wind 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: according to the production demand, adjust the crisscross angle of shower nozzle 21 on the first ring body 22 of spouting fine ring 20 and the second ring body 23 to realize the form and the fibre web degree of consistency control to the fibre web, can enough realize covering the fibre web in membrane body 1 surface all-round promptly, and improve the degree of consistency that covers of fibre web, can also realize forming banding fibre web at membrane body 1 surface, realize multiple composite construction plastic film.

In conclusion, the invention realizes the basic synchronous molding of the film body and the fiber net layer through the fiber spraying ring, greatly shortens the production time, reduces the cost, improves the compounding degree of the film body and the fiber net layer, realizes the production of the double-layer plastic film, realizes high strength and good wear resistance of the outer layer through the fiber net layer, and realizes good elasticity and sealing property of the inner side through the film body; and the fiber spraying ring 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.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

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.