CN113459492B

CN113459492B - High-strength PVC (polyvinyl chloride) film and production device and production process thereof

Info

Publication number: CN113459492B
Application number: CN202111035498.1A
Authority: CN
Inventors: 高志兵; 戴春梅; 邢云
Original assignee: Nantong Huiyuan Plastic Co ltd
Current assignee: Nantong Huiyuan Plastic Co ltd
Priority date: 2021-09-06
Filing date: 2021-09-06
Publication date: 2021-11-23
Anticipated expiration: 2041-09-06
Also published as: CN113459492A

Abstract

The invention relates to a high-strength PVC film, a production device and a production process thereof, which are used for building a greenhouse and comprise a film body, wherein a plurality of bundles of high-strength and high-modulus fibers which are arranged in parallel are uniformly embedded in the film body along the length direction, the high-strength and high-modulus fibers comprise two marginal reinforcing fibers arranged at the edges of two sides of the film body and a plurality of bundles of intermediate fibers arranged between the two marginal reinforcing fibers, and the diameter or the maximum thickness of the marginal reinforcing fibers is not less than that of the intermediate fibers; according to the invention, the high-strength and high-modulus fibers are embedded, so that the longitudinal strength of the film body is greatly improved, the greenhouse film can keep higher tension degree when a greenhouse is built, and the overall strength and wind resistance of the greenhouse are improved; the device can be produced only by additionally arranging the cooling sleeve, the fiber carding device and the like on the basis of the existing blow molding device, the modification cost is low, and the large-scale popularization and application are facilitated.

Description

High-strength PVC (polyvinyl chloride) film and production device and production process thereof

Technical Field

The invention belongs to the technical field of agricultural plastic films, and particularly relates to a high-strength PVC film, and a production device and a production process thereof.

Background

With the gradual popularization of the agricultural mulching film in China, the development of Chinese agriculture is greatly promoted. At present, China is the country with the most agricultural mulching film production and use, and the consumption of the agricultural mulching film reaches the megaton level at present. With the continuous innovation of agricultural plastic application technology, the greenhouse film (taking PVC material as the mainstream) is taken as the absolute main force in the agricultural mulching film, the effect of the greenhouse film in agricultural development is more and more obvious, and especially the application of the multifunctional greenhouse film plays an important role in promoting the high-efficiency and high-quality development of agriculture. The multifunctional greenhouse film is characterized by mainly showing long service life, drip prevention, fog prevention, heat preservation and the like, and has better performances in the aspects of light transmission, heat preservation, weather resistance, dripping resistance, fog prevention and the like.

The light transmittance and transparency of the greenhouse film are important functional indexes, main factors influencing the light transmittance and transparency of the greenhouse film comprise basic materials and additives, a processing technology, the thickness of the greenhouse film and the like, the thinner the greenhouse film is, the better the light transmittance and transparency is, but in order to ensure that the greenhouse film has enough service life and mechanical properties, the too thin the greenhouse film cannot be made.

In addition, when the greenhouse film is laid, enough tension degree needs to be kept, so that the film surface of the greenhouse is smooth after the greenhouse is built, the overall strength and the dripping performance of the greenhouse are ensured, and the reduction of the dripping performance and the like caused by the friction between the film surface and the supporting frame due to wind and the like is reduced. However, if the force for stretching the greenhouse film during the laying is too high, the greenhouse film may be torn or locally thinned, which may adversely affect the greenhouse film.

In view of the above, there is a need to provide a greenhouse film, especially a PVC film, which has higher strength and thinner thickness, but it is generally difficult for the product produced by the existing PVC film production apparatus to meet the requirement of high strength, and it is beneficial for enterprises and society if the existing PVC film production apparatus can be modified at low cost to produce high-strength PVC film.

Disclosure of Invention

The invention aims to provide a high-strength PVC film.

The invention aims to provide a device and a process for producing a high-strength PVC film.

In order to solve the technical problem, the invention discloses a high-strength PVC (polyvinyl chloride) film which is used for building a greenhouse and comprises a film body, wherein a plurality of bundles of high-strength and high-modulus fibers which are arranged in parallel are uniformly embedded in the film body along the length direction, the high-strength and high-modulus fibers comprise two marginal reinforcing fibers arranged at the edges of two sides of the film body and a plurality of bundles of middle fibers arranged between the two marginal reinforcing fibers, and the diameter or the maximum thickness of the marginal reinforcing fibers is not smaller than that of the middle fibers.

Preferably, the high-strength high-modulus fibers in the membrane body are arranged at intervals of not less than 10 mm.

Preferably, the individual diameter or maximum thickness of the intermediate fibers is no greater than 1/4 the thickness of the film body.

Preferably, the cross section of the high-strength and high-modulus fiber is one of a circle, an ellipse or a triangle.

A device for producing high-strength PVC films is produced by a blow molding method and comprises a flat extrusion blow molding machine of an upper blowing type, wherein the blow molding machine comprises an extruder, a herringbone plate and a traction roller which are sequentially arranged from bottom to top; the extruding machine comprises a parison die head for extruding a tubular parison, the middle part of the parison die head is provided with an air inlet pipe for introducing compressed air to blow the tubular parison into a bubble tube, the middle part of the parison die head is also vertically provided with a cooling sleeve for protecting high-strength fibers from entering the bubble tube at a safe temperature, and the upper end of the cooling sleeve is vertically fixed with a fiber carding device; the upper end of the fiber carding unit extends to the intersection of the herringbone plates at the upper part of the blow molding machine.

Preferably, the fiber carding device comprises a trapezoidal plate with a long side facing upwards and a plurality of outlet pipes which are arranged and fixed at the upper part of the trapezoidal plate, wherein the long side of the trapezoidal plate is not less than 9/10 of the width of the intersection of the herringbone plates of the blow molding machine; the lower part of the trapezoidal plate is provided with a fan-shaped deconcentrator, the fan-shaped deconcentrator comprises a first shell and a second shell which are spliced, the inner side surface of the first shell is provided with a plurality of radially-arranged outgoing line grooves, the lower end of each outgoing line groove is provided with a deconcentrator plate, the tail end of the deconcentrator plate is a sharp part which is not enough to cut off high-strength and high-modulus fibers, and the deconcentrator plates are radially arranged; the lower part of the fan-shaped deconcentrator is provided with a channel cavity communicated with the cooling sleeve and the wire outlet groove, the lower end of the channel cavity is circular, the upper end of the channel cavity is duckbilled, and the middle part of the channel cavity is a transition section;

the wire outlet pipes correspond to the wire outlet grooves one to one, and the cooling sleeve, the channel cavity, the wire outlet grooves and the wire outlet pipes form a fiber channel for passing high-strength and high-modulus fibers.

Preferably, the outlet pipe comprises an upper straight pipe section and a lower inclined pipe section, the straight pipe sections are vertically arranged, and the inclined pipe sections of all the outlet pipes are radially arranged corresponding to the outlet grooves; the inclined pipe section is a straight pipe or a bent pipe;

the wire inlet seam is processed on the side wall of the wire outlet pipe far away from the trapezoidal plate, and the width of the wire inlet seam is gradually reduced from outside to inside.

Preferably, the inner diameter of the outgoing line groove positioned on two sides in the outgoing line groove is not less than the inner diameter of other outgoing line grooves; the inner diameters of the outlet pipes on the two sides are not smaller than the inner diameters of the other outlet pipes.

Preferably, the cooling sleeve comprises an outer pipe and an inner pipe sleeved in the outer pipe, partition plates arranged along the axial direction are fixed between the outer pipe and the inner pipe, the two partition plates are symmetrical, an interlayer between the outer pipe and the inner pipe is divided into a liquid inlet/gas area and a liquid outlet/gas area, the upper end of the interlayer between the outer pipe and the inner pipe is sealed, and a gap is arranged between the partition plates and the upper end of the interlayer to communicate the liquid inlet/gas area and the liquid outlet/gas area, so that the interlayer between the outer pipe and the inner pipe forms a refrigerant channel;

a first heat insulation layer is arranged outside the cooling sleeve; a second heat insulation layer is arranged on one side wall of the inner wall of the cooling sleeve close to the liquid/gas outlet area.

A production process based on a device for producing a high-strength PVC film comprises the following steps:

s1, removing a cooling sleeve, enabling a plurality of bundles of high-strength and high-modulus fibers to penetrate out of the lower end of the cooling sleeve to a fiber carding device, opening the fiber carding device, respectively placing the plurality of bundles of high-strength and high-modulus fibers in fiber channels, placing one bundle or one high-strength and high-modulus fiber in each fiber channel, closing the fiber carding device after the front ends of the high-strength and high-modulus fibers extend out of a wire outlet pipe, and fixing the front ends of all the high-strength and high-modulus fibers together to form an end head;

s2, installing a cooling sleeve on the parison die head, wherein high-strength and high-modulus fibers are distributed, sequentially passing the end head through a traction roller and a guide roller of a blow molding machine, and then winding the end head on a winding device; starting the blow molding machine, blowing dry air into the cooling sleeve, spraying the dry air out of the upper end of the cooling sleeve and cooling the fiber carding device; meanwhile, a refrigerant is introduced into the refrigerant channel and circulates;

s3, starting a blow molding machine to blow out the bubble tubes, and leading the bubble tubes out to the intersection of the herringbone plates manually or mechanically, so that continuous production can be started; the bubble tube is not adhered to the outer wall of the cooling sleeve when being led out.

The high-strength PVC film and the production device and the production process thereof have the following advantages:

1) the longitudinal strength of the film body is greatly improved by burying high-strength high-modulus fibers, and the longitudinal tensile strength of the 8-filament-thick common PVC greenhouse film can exceed the longitudinal tensile strength of the 12-filament-thick common PVC greenhouse film; can make the big-arch shelter membrane keep higher rate of tension when setting up the big-arch shelter, improve the bulk strength and the wind resistance of big-arch shelter, the big-arch shelter membrane is difficult to be scraped rotten, blow wrinkle etc. can also reduce the friction between big-arch shelter membrane and the support frame like this, is favorable to the maintenance of big-arch shelter membrane flowing dripping nature.

2) The longitudinal strength of the film body is improved, so that the film body can be thinner, the light transmittance and the transparency of the greenhouse film are improved, the consumption of raw materials can be reduced, and the environment-friendly effect is realized.

3) The production device embeds the high-strength high-modulus fiber between the two films, the production process is simple, and the high-strength high-modulus fiber is not exposed.

4) Through setting up the fibre carding, carry out the equipartition, simple and practical with many bundles of high strength high modulus fibre.

5) The device can be produced only by additionally arranging the cooling sleeve, the fiber carding device and the like on the basis of the existing blow molding device, the modification cost is low, and the large-scale popularization and application are facilitated.

Drawings

FIG. 1 is a schematic structural view of a high strength PVC film;

FIG. 2 is a schematic structural view of an apparatus for producing a high-strength PVC film;

FIG. 3 is a schematic view of a cooling jacket;

FIG. 4 is a schematic cross-sectional view of the cooling jacket of FIG. 3;

FIG. 5 is a schematic view of a fiber carding machine;

fig. 6 is a partially enlarged view of the area a in fig. 5.

Fig. 7 is a schematic perspective view of the fan-shaped splitter of fig. 5.

Fig. 8 is a schematic diagram of an inner side surface structure of the first housing in fig. 7.

The reference numbers in the figures are: a-film body, b-marginal reinforcing fiber, c-middle fiber, 1-blow molding machine, 2-extruding machine, 3-herringbone plate, 4-drawing roller, 5-parison die head, 6-bubble tube, 7-air inlet tube, 8-cooling sleeve, 801-outer tube, 802-inner tube, 803-clapboard, 804-notch, 805-first heat insulation layer, 806-second heat insulation layer, 9-fiber carding machine, 10-trapezoidal plate, 11-outlet tube, 1101-straight tube section, 1102-inclined tube section, 1103-inlet seam, 12-fan-shaped splitter, 13-first shell, 14-second shell, 15-outlet groove, 16-splitter plate, 17-channel cavity, 1701-lower end of channel cavity, 1702-middle of channel cavity, 1703-upper end of the channel cavity, d-liquid inlet/gas zone, e-liquid outlet/gas zone.

Detailed Description

The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.

It will be understood that terms such as "having," "including," and "comprising," when used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

Example 1

As shown in fig. 1, the high-strength PVC membrane is used for building a greenhouse, and comprises a membrane body a, wherein a plurality of bundles of high-strength and high-modulus fibers arranged in parallel are uniformly embedded in the membrane body along the length direction, the high-strength and high-modulus fibers comprise two marginal reinforcing fibers b arranged at the edges of two sides of the membrane body and a plurality of bundles of intermediate fibers c arranged between the two marginal reinforcing fibers, and the diameter or the maximum thickness of the marginal reinforcing fibers is not less than that of the intermediate fibers. The high-strength high-modulus fiber has high strength and is not easy to deform; the high-strength and high-modulus fibers which are longitudinally arranged can greatly increase the overall longitudinal tensile strength of the high-strength PVC film, and in the film laying process of the greenhouse, large tensile force can be applied to the longitudinal two sides of the high-strength PVC film so that the high-strength PVC film can keep enough tension. The diameter or the maximum thickness of the marginal reinforcing fiber is larger, so that tearing or stretching deformation at two edges of the high-strength PVC film can be effectively prevented.

The arrangement interval of the high-strength and high-modulus fibers in the membrane body is not less than 10 mm. The transparency of the high-strength and high-modulus fibers is generally not high, and the arrangement interval of the high-strength and high-modulus fibers in the film body is too small and the density is too large, so that the overall light transmittance and transparency of the film body are reduced.

The individual diameter or maximum thickness of the intermediate fibers is no greater than 1/4 the thickness of the film body. The diameter of the high-strength high-modulus fiber is too large, so that the longitudinal tensile strength of the high-strength PVC film is further improved, but the uneven surface and the obvious striped protrusion of the high-strength PVC film are caused, and the dripping property of the high-strength PVC film is reduced.

The cross section of the high-strength high-modulus fiber is one of a circle, an ellipse or a triangle. The high-strength high-modulus fiber can be selected from Spiketzian fiber, Kevlar fiber and the like, or other fibers with relatively low strength and modulus but good transparency are adopted. The cross section is the better combination of circular, oval-shaped high strength high modulus fibre ability and PVC membrane, and the cross section is the effect that triangular high strength high modulus fibre can produce similar prism, makes the high strength PVC membrane present slight colorful effect of dazzling under certain sun valley shines the angle, and is comparatively pleasing to the eye, and can regard as a distinguishing characteristic who is distinguished from other membranes, more has the degree of distinguishing.

When the high-strength PVC film is laid, the two short edges (vertical to the arrangement direction of the high-strength high-modulus fibers) of the PVC film can be rolled up by using steel wires, smooth bamboo chips and the like as inner cores, so that the laying operation with larger tension force is facilitated, and the local stretching deformation of the two short edges of the PVC film is prevented.

Example 2

As shown in fig. 2-8, an apparatus for high strength PVC film, produced by blow molding, comprises a flat extrusion blow molding machine 1 of blow molding type, which comprises an extruder 2, a chevron plate 3 (or a guide roll) and a traction roll 4 arranged in sequence from bottom to top; the extruder comprises a parison die head 5 for extruding a tubular parison, the middle part of the parison die head is provided with an air inlet pipe 7 for introducing compressed air to blow the tubular parison into a bubble tube 6, the middle part of the parison die head is also vertically provided with a cooling sleeve 8 for protecting high-strength and high-modulus fibers from entering the bubble tube at a safe temperature, and the upper end of the cooling sleeve is vertically fixed with a fiber carding device 9; the upper end of the fiber carding unit extends to the intersection of the herringbone plates at the upper part of the blow molding machine. The cooling sleeve can be arranged in the air inlet pipe, and a mounting hole can be longitudinally formed beside the air inlet pipe so that the bottom of the cooling sleeve is communicated with the outside. Due to the high temperature at the parison die, temperature protection of the high strength and modulus fibers is necessary to prevent the bundles of high strength and modulus fibers from deteriorating or sticking at high temperatures. A plurality of bundles of high-strength and high-modulus fibers are gathered together and pass through the cooling sleeve, and can not be easily knotted, twisted, adhered or disconnected only by a proper yarn dividing device, so that the problems can be better solved by the fiber carding device.

As shown in fig. 5-8, the fiber carding device comprises a trapezoidal plate 10 with a long side facing upwards and a plurality of outlet pipes 11 arranged and fixed on the upper part of the trapezoidal plate, wherein the long side of the trapezoidal plate is not less than 9/10 of the width of the intersection of the herringbone plates of the blow molding machine (under the premise of not influencing the folding of the bubble tube, the long side of the trapezoidal plate can be as close as possible to the width of the intersection of the herringbone plates so as to uniformly distribute high-strength and high-modulus fibers); the lower part of the trapezoidal plate is provided with a fan-shaped deconcentrator 12, the fan-shaped deconcentrator comprises a first shell 13 and a second shell 14 which are spliced with each other, the first shell and the second shell can be spliced through installation or hinged at one side, the other side is spliced in a buckling manner, a plurality of radially-arranged outgoing line grooves 15 are processed on the inner side surface of the first shell, the lower end of each outgoing line groove is provided with a deconcentrating plate 16, the tail end of the deconcentrating plate is a sharp part which is not enough to cut off high-strength high-modulus fibers, and the sharp part can effectively separate part of the high-strength high-modulus fibers with adhesion; the plurality of line distribution plates are arranged in a radial shape; a channel cavity 17 for communicating the cooling sleeve with the outlet groove is formed in the lower portion of the fan-shaped wire divider, the lower end 1701 of the channel cavity is circular, the upper end 1703 of the channel cavity is duckbilled, and the middle 1702 of the channel cavity is a transition section;

the wire outlet pipes correspond to the wire outlet grooves one to one, the cooling sleeve, the channel cavity, the wire outlet grooves and the wire outlet pipes form a fiber channel for passing high-strength high-modulus fibers, and the plurality of fiber channels enable the gathered high-strength high-modulus fibers to be uniformly separated, so that the PVC film can be conveniently combined with one another in the next step.

As shown in fig. 6, the outlet pipe comprises an upper straight pipe section 1101 and a lower inclined pipe section 1102, and the straight pipe section and the inclined pipe section are communicated to bend and redirect the high-strength and high-modulus fibers; the straight pipe sections are vertically arranged, and the inclined pipe sections of all the wire outlet pipes are arranged in a radial shape corresponding to the wire outlet grooves; the inclined pipe section is a straight pipe or a bent pipe; the inclined pipe sections arranged in a radial shape enable high-strength and high-modulus fibers to naturally enter the wire outlet pipe, so that the wire is not easy to break; the straight pipe section enables the high-strength and high-modulus fibers to be exposed and then can be arranged in parallel with the length direction of the membrane body so as to be conveniently combined with the membrane body.

An incoming line seam 1103 is processed on one side wall of the outgoing line pipe, which is far away from the trapezoidal plate, and the width of the incoming line seam is gradually reduced from outside to inside. When the high-strength high-modulus fibers are arranged on the fiber carding device, the end parts of the high-strength high-modulus fibers can penetrate out of the outlet pipe, so that the efficiency is low; and set up into the seam on going out the spool, only need hand high strength high modulus fibre end with it fill in the spool from inlet seam department can, efficiency is higher. The outlet pipe can be made of elastic materials, so that the seam of the inlet thread can be closed well, and the high-strength and high-modulus fiber penetrating into the outlet pipe is not easy to fall out of the outlet pipe again.

In the outgoing line grooves, the inner diameters of outgoing line grooves on two sides are not smaller than the inner diameters of other outgoing line grooves; the inner diameters of the outlet pipes on the two sides are not smaller than the inner diameters of the other outlet pipes.

As shown in fig. 3-4, the cooling jacket includes an outer tube 801 and an inner tube 802 sleeved in the outer tube, wherein two axially disposed partition plates 803 are fixed between the outer tube and the inner tube, the two partition plates are symmetrical to divide an interlayer between the outer tube and the inner tube into a liquid inlet/air region d and a liquid outlet/air region e, the upper end of the interlayer between the outer tube and the inner tube is sealed, and a gap 804 is disposed between the partition plate and the upper end of the interlayer to communicate the liquid inlet/air region and the liquid outlet/air region, so that the interlayer between the outer tube and the inner tube forms a refrigerant channel.

A first heat insulation layer 805 is arranged outside the cooling sleeve; a second insulating layer 806 is arranged on one side wall of the inner wall of the cooling jacket near the liquid/gas outlet region. The liquid outlet/air region is positioned at the end section of the refrigerant channel, and the temperature is relatively high, so that the second heat insulation layer is arranged to force the high-strength and high-modulus fibers to approach the liquid inlet/air region.

When the fiber carding machine is used, the cooling sleeve is firstly dismounted, a plurality of bundles of high-strength and high-modulus fibers (a high-strength and high-modulus fiber rolling device can be arranged to continuously convey the high-strength and high-modulus fibers into the cooling sleeve, and two marginal reinforcing fibers can be additionally arranged) penetrate out of the lower end of the cooling sleeve to the fiber carding machine, the fiber carding machine is opened, the plurality of bundles of high-strength and high-modulus fibers are respectively placed in fiber channels, one high-strength and high-modulus fiber is placed in each fiber channel, after the front end of each high-strength and high-modulus fiber extends out of the upper part of the outlet pipe, the fiber carding machine is closed, and the front ends of all the high-strength and high-modulus fibers are fixed together to form an end head (for example, the front ends of the high-strength and high-modulus fibers can be bonded and clamped through an adhesive tape to form a flat end head) for standby;

installing a cooling sleeve on the parison die head, arranging high-strength and high-modulus fibers, sequentially passing the end head through a traction roller and a guide roller 18, and finally winding the end head on a winding device 19; starting the blow molding machine, and injecting dry air into the cooling sleeve (the dry air can be blown into the cooling sleeve through an air pump and an air pipe which are additionally arranged, or can be blown into the cooling sleeve by virtue of part of compressed air), so that the dry air is sprayed out from the upper end of the cooling sleeve and cools the fiber carding device, and the dry air is also helpful for enabling the high-strength and high-modulus fibers to generate static electricity to keep a fluffy state; meanwhile, the refrigerant is introduced into the refrigerant channel and circulates. Starting a blow molding machine to blow out the bubble tubes, and leading the bubble tubes out to the intersection of the herringbone plates manually or mechanically, so that continuous production can be started; the bubble tube is not adhered to the outer wall of the cooling sleeve and the fiber carding device when being led out; in order to facilitate the leading-out of the bubble tube at the beginning and avoid the bubble tube from being stuck on the outer wall of the cooling sleeve, a movable sleeve which can slide up and down and has light weight can be sleeved on the outer side of the cooling sleeve, the bubble tube which is just blown out is connected with the movable sleeve, the movable sleeve rises along with the expansion of the bubble tube, and the movable sleeve is disconnected with the bubble tube when rising to the upper end of the cooling sleeve.

During production, the uniformly distributed high-strength high-modulus fibers are combined with the PVC film into a whole at the intersection of the herringbone plates and in the subsequent steps, a small amount of gaps may exist at the intersection of the high-strength high-modulus fibers and the PVC film, and if the gaps need to be further eliminated, the finished product can be hot pressed again to further eliminate the gaps.

It is worth to be noted that a plurality of high-strength and high-modulus fibers can be customized and can also be obtained by disassembling a thicker raw material rope, the high-strength and high-modulus fibers sent out from a fiber carding device can be observed at intervals in the production process, an industrial camera and the like can also be adopted to carry out quality inspection on the product, and if a small amount of high-strength and high-modulus fibers are broken or lost, the product can be continuously produced under the condition of not generating great influence on the product performance; if the breaking amount of the high-strength high-modulus fibers is large (such as 2%), stopping the machine and rearranging the high-strength high-modulus fibers on the fiber carding machine; however, if the marginal reinforcing fibers are found to be missing or broken, the finishing should be stopped immediately. In addition, if the combination of the fiber and the film is difficult, the sizing material can be used for presoaking the high-strength and high-modulus fiber, and the hot roller is used for enhancing the combination force after the combination.

The invention can also be used for the reinforced production of other plastic films made of PE, EVA and the like.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.

Claims

1. A device for producing high-strength PVC films is produced by a blow molding method and comprises a flat extrusion blow molding machine of an upper blowing type, wherein the blow molding machine comprises an extruder, a herringbone plate and a traction roller which are sequentially arranged from bottom to top; the extrusion machine comprises a parison die head for extruding a tubular parison, and the middle part of the parison die head is provided with an air inlet pipe for introducing compressed air to blow the tubular parison into a bubble tube; the upper end of the fiber carding unit extends to the intersection of the herringbone plates at the upper part of the blow molding machine;

the fiber carding device comprises a trapezoidal plate with an upward long edge and a plurality of outlet pipes which are arranged and fixed on the upper part of the trapezoidal plate, and a fan-shaped deconcentrator is arranged on the lower part of the trapezoidal plate.

2. The apparatus for producing high strength PVC film according to claim 1, wherein the long side of said trapezoidal plate is not less than 9/10 of the width of the intersection of the chevron plates of the blow molding machine; the fan-shaped deconcentrator comprises a first shell and a second shell which are spliced, a plurality of radially-arranged outgoing line grooves are formed in the inner side surface of the first shell, a deconcentrator plate is arranged at the lower end of each outgoing line groove, the tail end of each deconcentrator plate is a sharp part which is not enough for cutting off high-strength high-modulus fibers, and the deconcentrator plates are radially arranged; the lower part of the fan-shaped deconcentrator is provided with a channel cavity communicated with the cooling sleeve and the wire outlet groove, the lower end of the channel cavity is circular, the upper end of the channel cavity is duckbilled, and the middle part of the channel cavity is a transition section;

3. The apparatus for producing a high-strength PVC film according to claim 2, wherein the outlet pipe includes an upper straight pipe section and a lower inclined pipe section, the straight pipe sections are vertically arranged, and the inclined pipe sections of all the outlet pipes are radially arranged corresponding to the outlet grooves; the inclined pipe section is a straight pipe or a bent pipe;

4. The apparatus for manufacturing a high-strength PVC film according to claim 3, wherein of the outlet grooves, the inner diameter of the outlet groove on both sides is not less than the inner diameter of the other outlet grooves; the inner diameters of the outlet pipes on the two sides are not smaller than the inner diameters of the other outlet pipes.

5. The apparatus according to claim 1, wherein the cooling jacket comprises an outer tube and an inner tube sleeved in the outer tube, wherein two axially disposed partition plates are fixed between the outer tube and the inner tube, the two partition plates are symmetrical and divide an interlayer between the outer tube and the inner tube into a liquid inlet/gas region and a liquid outlet/gas region, the upper end of the interlayer between the outer tube and the inner tube is closed, and a gap is formed between the partition plate and the upper end of the interlayer to communicate the liquid inlet/gas region and the liquid outlet/gas region, so that the interlayer between the outer tube and the inner tube forms a refrigerant channel;

6. A production process of the device for producing high-strength PVC film based on claim 1 is characterized by comprising the following steps: