CN115742129A - Tape casting equipment and method for degradable breathable film - Google Patents

Abstract

The invention provides a tape casting forming device and a tape casting forming method for a degradable breathable film in the technical field of film production, wherein the tape casting forming device comprises a film processing assembly and an extrusion assembly; the extrusion assembly comprises: a die head assembly for continuously conveying the blanking; the die lip assembly is used for switching the extrusion position back and forth and cleaning and is arranged on one side of the bottom of the die head assembly; the membrane processing assembly comprises: the casting roller is arranged below the die lip assembly; and the homogenizing assembly is used for scraping and recycling the extrudate in a liquid state and is arranged on the discharging side of the die lip assembly to the casting roller. The invention can ensure the uniformity of the material extruded by the die lip, the film thickness uniformity of continuous flow delay on the casting roller and the like.

Description

Tape casting equipment and method for degradable breathable film

Technical Field

The invention relates to the technical field of film production, in particular to tape casting equipment and a tape casting method for a degradable breathable film.

Background

Casting is a plastic film production process, raw materials are plasticized and melted through an extruder, extruded through a T-shaped structure forming die, cast to the roll surface of a cooling roller which rotates stably in a sheet mode, a diaphragm is cooled and shaped on the cooling roller, then pulled and trimmed, and then a product is rolled.

With the enhancement of the environmental awareness of human beings, more and more consumers choose to use the packing materials made of degradable materials to reduce the harm of plastic products to the environment, wherein the degradable breathable film made of calcium carbonate serving as a main raw material is welcomed by the consumers, such as CN106220961B degradable film components applied by the applicant in the prior art, and is also suitable for manufacturing the degradable breathable film.

For example, chinese patent CN217258247U discloses a high efficiency tape casting extrusion molding device, which comprises a die body, a support, a die head, a tooth column and a fixing rod, wherein two ends of the die body are slidably connected to the support, and the bottom of the die body is provided with the die head in a matching manner. The utility model discloses a set up mould body, support, mould head, tooth post and dead lever.

However, in this technical scheme, although the separation of the die body can be realized, and the cleaning treatment of the coagulated particles and the like at the position of the die lip during the extrusion of the die can be performed to ensure the uniformity of the flow delay, the die needs to be disassembled in this way, so that the shutdown and disassembly of the die are required during the production of the film easily, and the production efficiency of the film product is reduced.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides tape casting equipment for degradable breathable films, which melts master batches through a die head assembly, sends the master batches to a die lip assembly through an extrusion channel, controls extrusion through mutual approaching of an upper die lip assembly, realizes that the lower die lip assembly leaves towards the thickness direction of the extrusion channel and then leaves towards one side in the width direction, then the lower die lip assembly leaves the extrusion channel, continues extrusion control by using the lower die lip assembly, then carries out solidified material cleaning on the extrusion position of the lower die lip through a cleaning assembly, and blows extruded materials cast onto a tape casting roller by a blowing assembly to keep the extruded materials in a molten state to be tightly attached to the tape casting roller, scrapes the redundant parts through a scraping assembly, and recovers through a receiving assembly, so as to solve the technical problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

the curtain coating forming equipment for the degradable breathable film is characterized by comprising a film processing assembly and an extrusion assembly; the extrusion assembly comprises: a die head assembly for continuously conveying the blanking; the die lip assembly is used for switching the extrusion position back and forth and cleaning and is arranged on one side of the bottom of the die head assembly; the membrane treatment assembly comprises: the casting roller is arranged below the die lip assembly; and the homogenizing assembly is used for enabling the extrudate to be in a liquid state, is scraped and recycled and is arranged on the discharging side of the die lip assembly to the casting roller.

Further, the die lip assembly comprises: the middle of the base, which is arranged below the die head assembly, is provided with an extrusion channel; the upper die lip assembly reciprocates back and forth along the extrusion thickness direction to adjust the extrusion thickness and is arranged on one side of the bottom of the die head assembly; the lower die lip assembly is arranged on one side of the bottom of the upper die lip assembly, and leaves the extrusion channel along the extrusion thickness direction, withdraws along the extrusion width direction and then reaches the extrusion channel again; and the cleaning components are used for cleaning the inflection point of the die orifice of the withdrawn lower die lip component and are arranged at two sides of the lower die lip component.

Further, the upper die lip assembly comprises: upper die lips obliquely arranged on the end surfaces and arranged on two sides of the extrusion channel; and the upper die driving assembly is arranged on the base and is arranged on the base.

Further, the lower die lip assembly includes: the guide rail is arranged on the base; the lower die lips are arranged on two sides of the extrusion channel, the top parts of the lower die lips which are obliquely arranged on the end surfaces are arranged in a sliding manner with the upper die lips, and one side of the bottom parts of the lower die lips are arranged in the guide track in a sliding manner; and the lower die driving component is used for driving the lower die lip to reciprocate back and forth along the guide rail and is arranged on the base.

Further, the cleaning assembly comprises: the heat insulation cavity corresponding to the lower die lip is arranged on two sides of the base; the die scraping assembly is used for cleaning the lower die lip along the length direction and is arranged on the base; and the material cleaning component is used for removing materials from the scraping die component and is arranged at the tail end of the stroke of the scraping die component.

Further, the scraping die assembly comprises: the two sides of the scraping mould respectively correspond to the inclined side end part of the lower mould lip; and the scraping power part drives the scraping module to adjust the height of the scraping die and moves the scraping die towards the length direction of the lower die lip, and the scraping power part is arranged on the machine base.

Further, the clear material subassembly includes: a driving seat; the side cleaning assembly is used for driving and clamping the front side and the rear side of the scraping module to be arranged on the driving seat; the end cleaning components drive the end cleaning components elastically clamping the left end and the right end of the scraping mould component to be arranged on the driving seat; and the lifting driving component drives the driving seat to reciprocate up and down and is arranged on the base.

Further, the homogenizing assembly comprises: a blowing assembly for blowing hot air to the extruded material to make the extruded material close to the surface of the casting roller; the scraping piece is arranged on one side of the blowing air tangentially and positioned above the extruded material and is arranged below the blowing assembly; and the material collecting assembly is used for scraping the material scraping part and collecting the scraped material, and the material collecting assembly is arranged on the material scraping part.

Further, receive the material subassembly and include: the material receiving cavity is arranged on the scraping piece; the material receiving roller is rotatably arranged above the scraping piece and is positioned at an opening at one side of the material receiving cavity; and material carrying spaces are circumferentially distributed on the material receiving roller.

In order to achieve the aim, the invention provides a method for producing a breathable film by using casting equipment of the degradable breathable film, which is characterized by comprising the following steps:

feeding, namely melting and extruding master batches to a die lip assembly through a die head assembly and discharging;

secondly, die lips are alternated, the lower die lip assembly extrudes the blanking, then the upper die lip assembly firstly reaches two sides of the extrusion channel, then the upper die lip assembly leaves two sides in the thickness direction and withdraws towards one side in the width direction, then the lower die lip reaches two sides of the extrusion channel again, then the upper die lip leaves two sides in the width direction of the extrusion channel, the lower die lip is used for carrying out extrusion control again, and the process is repeated;

cleaning the die lip, cleaning the die scraping assembly along the length direction of the lower die lip while the heat preservation chamber preserves the heat of the moved lower die lip, and after the cleaning is finished, cleaning the die scraping assembly by the material cleaning assembly, and then recycling the die scraping assembly;

and step four, discharging and homogenizing, wherein the extrudate continuously falls onto the casting roller through the die lip assembly and is processed and attached to the casting roller by hot air of the blowing assembly, the material scraping piece scrapes off redundant parts according to the preset thickness, the material receiving roller rotates to enable the redundant materials to be brought into the material receiving chamber through the material carrying space along with accumulation of the redundant materials, and then the extruded materials are cooled, measured in thickness, pulled, cut edge, subjected to corona treatment and then wound.

The invention has the beneficial effects that:

(1) According to the invention, through the mutual matching between the die lip assembly and the homogenizing assembly, the uniformity of the film in extrusion can be conveniently ensured, so that the thickness uniformity of the cast film is ensured;

(2) According to the invention, through the mutual matching between the upper die lip assembly and the lower die lip assembly, the mutual switching between the lower die lip assembly and the upper die lip assembly can be realized, so that the lower die lip assembly is in a short-time leaving state, the extrusion control of materials is continuously ensured by using the upper die lip assembly, the continuity of material extrusion is realized, and meanwhile, the cleaning switching of the lower die lip assembly during continuous extrusion is realized, so that the extrusion control of the materials is completed under the condition that the surface treatment of the lower die lip assembly is relatively clean;

(3) According to the invention, through the mutual matching between the lower die lip and the guide rail, the lower die lip can be firstly separated towards two sides along the thickness direction of the extrusion channel and then removed, so that the problem that the surface of the extruded film is damaged when the lower die lip is directly removed along the width direction of the extrusion channel is solved;

(4) According to the invention, through the mutual matching of the scraping die assembly and the material cleaning assembly, the lower die lip can be cleaned by the scraping die assembly, and meanwhile, the material cleaning assembly is utilized to ensure the cleanness of the surface of the scraping die assembly, so that the next cleaning work is facilitated;

(5) According to the invention, through mutual matching between the blowing assembly and the scraping member, the uniformity of the thickness of the film can be further ensured in time delay, and through the structural design of the receiving assembly, the collection of the scraped redundant material can be conveniently realized;

in conclusion, the invention has the advantages of ensuring the uniformity of the material extruded by the die lip, ensuring the film thickness uniformity of continuous flow delay on the casting roller and the like.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is an enlarged view of the structure of FIG. 1 according to the present invention;

FIG. 3 is a schematic structural view of a membrane processing assembly of the present invention;

FIG. 4 is an enlarged view of the area A of FIG. 3 according to the present invention;

FIG. 5 is a schematic structural view of a die assembly of the present invention;

FIG. 6 is a schematic view of a cleaning assembly of the present invention;

FIG. 7 is a schematic view of the wiper assembly of the present invention;

FIG. 8 is a schematic structural view of the material cleaning assembly of the present invention;

FIG. 9 is a cross-sectional view F-F of FIG. 6 according to the present invention;

FIG. 10 is a cross-sectional view of N-N of FIG. 6 in accordance with the present invention;

FIG. 11 is a cross-sectional view of M-M of FIG. 6 in accordance with the present invention;

FIG. 12 is a flow chart of the molding method of the present invention.

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 description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" 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" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

Example one

As shown in fig. 1, 2 and 5, the casting equipment for the degradable breathable film comprises a film processing assembly 1 and an extrusion assembly 2; the extrusion assembly 2 comprises: a die head assembly 21 for continuously conveying the blanking; the die lip assembly 22 is used for switching the extrusion position back and forth and cleaning the die lip assembly 22 and is arranged on one side of the bottom of the die head assembly 21; the membrane treatment assembly 1 comprises: the casting roller 11 is arranged below the die lip assembly 22, and the casting roller 11 is arranged below the die lip assembly 22; and a homogenizing assembly 12, wherein the homogenizing assembly 12 which enables the extrudate to be in a liquid state for scraping and recycling is arranged on the discharging side of the die lip assembly 22 to the casting roller 11.

Through the above, it is not difficult to find that, in the casting process of the air-permeable mold, by using the die head assembly 21 to load the film-making master batch, the granules are melted at high temperature and enter the die lip assembly 22 to extrude the material, meanwhile, the extruded material reaches the casting roller 11 to be cast, and in the casting process, in order to ensure the uniformity of the film thickness, the homogenizing assembly 12 heats the film just flowing onto the casting roller 11 to ensure the fluid state, and scrapes off the excessive thickness to recover, wherein, when the die lip assembly 22 extrudes, the extruding position can be automatically cleaned, thereby ensuring the uneven extrusion caused by the solidification of the extruded material at the extruding position of the die during the extrusion.

It is also necessary to supplement that the film processing assembly 1 further comprises a cooling roll 13, a guide roll 14, a thickness gauge 15, a drawing roll 16, a corona treatment device 17 and a take-up roll 18.

As shown in fig. 9, the die lip assembly 22 includes: the base 221 is arranged below the die head assembly 21, and an extrusion channel 2211 is arranged in the middle of the base 221; an upper die lip assembly 222, wherein the upper die lip assembly 222 which reciprocates back and forth along the extrusion thickness direction to adjust the extrusion thickness is arranged on one side of the bottom of the die head assembly 21; a lower lip assembly 223 which is separated from the extrusion passage 2211 in the extrusion thickness direction and evacuated in the extrusion width direction, and the lower lip assembly 223 which reaches the extrusion passage 2211 again is provided on the bottom side of the upper lip assembly 222; and a cleaning assembly 224 for cleaning the die lip assembly 223 withdrawn at the die corner, the cleaning assembly 224 being disposed at both sides of the lower die lip assembly 223.

In this embodiment, in the switching process of the die lip assembly 22, when the lower die lip assembly 223 continues to perform extrusion control, the upper die lip assembly 222 reaches two sides of the extrusion channel 2211 to perform control extrusion, and then the lower die lip assembly 223 is withdrawn, so that the position where the extrusion control is originally performed reaches the cleaning assembly 224 to perform cleaning of the surface of the die lip, so as to ensure that particles formed by the extrudate are condensed on the die lip to influence the uniformity of extrusion, and in the processing process of the cleaning assembly 224, the other side of the lower die lip assembly 222 reaches two sides of the extrusion channel 2211, the upper die lip assembly 222 is separated, the lower die lip assemblies 222 on two sides of the extrusion channel 2211 are used to perform extrusion control of extrusion, and the above steps are repeated to realize the back-and-forth switching of the lower die lip assemblies 222.

It should be added that the die assembly 21 includes a hopper 211 and a die 212 for melting and discharging the master batch downward.

As shown in fig. 9, the upper die lip assembly 222 includes: upper die lips 2221 obliquely arranged on both sides of the extrusion passage 2211 and on the end surfaces thereof; and an upper mold driving assembly 2222, the upper mold driving assembly 2222 mounted on the base 221 being mounted on the base 221.

The upper die driving assembly 2222 is preferably a cylinder.

As shown in fig. 9-11, lower die lip assembly 223 includes: a guide rail 2231 provided on the base 221; a lower die lip 2232 arranged on both sides of the extrusion passage 2211, wherein the top of the lower die lip 2232 arranged obliquely at the end surface is arranged in a sliding manner with the upper die lip 2221, and one side of the bottom is arranged in the guide rail 2231 in a sliding manner; and a lower die driving assembly 2233, wherein the lower die driving assembly 2233 for driving the lower die lip 2232 to reciprocate back and forth along the guide rail 2231 is mounted on the base 221.

In this embodiment, when the lower die driving assembly 2233, preferably an air cylinder, drives the lower die lip 2232 to move back and forth, the lower end of the lower die lip 2232 is made to move back and forth by being inserted into the guide rail 2231 preferably by a guide member, so as to separate the lower die lip 2232 toward two sides of the thickness of the extrusion channel 2211, and by this separation manner, the extruded material can be separated in the fastest manner, and the technical problem of unevenness of the film surface caused by the fact that the lower die lip 2232 directly separates along two sides in the width direction of the extrusion channel 2211 is solved, and it is also necessary to supplement that the power end of the lower die driving assembly 2233 is slidably connected to the lower die lip 2232.

The guide rail 2231 is a U-shaped rail which is symmetrically arranged and has two obliquely arranged sides.

As shown in fig. 7, the cleaning assembly 224 includes: the heat preservation chamber 2241 corresponds to the lower die lip 2232, and the heat preservation chamber 2241 is arranged on two sides of the base 221; a die scraping assembly 2242, which is used for cleaning the lower die lip 2232 along the length direction and is installed on the machine base 221; and material cleaning assembly 2243, right scrape mould subassembly 2242 and take off the material clear material assembly 2243 locates scrape mould subassembly 2242's stroke end.

In this embodiment, clearance subassembly 224 can clear up the lower mould lip 2232 that arrives in the heat preservation cavity 2241 through scraping mould subassembly 2242 at the in-process of clearing up lower mould lip 2232 to after the clearance, clear material subassembly 2243 still can clear up scraping material subassembly 2242, in order to guarantee to scrape the clean nature on material subassembly 2242 surface, thereby so that realize the clearance to lower mould lip 2232 once more.

As shown in fig. 7, the scraper module 2242 includes: the two sides of the scraping mould 22421 respectively correspond to the end part of the inclined side of the lower mould lip 2232; and a mold scraping power part 22422, which drives the mold scraping part 22421 to adjust the height of the mold scraping and moves the mold scraping towards the length direction of the lower mold lip 2232, the mold scraping power part 22422 is installed on the machine base 221.

In this embodiment, the surface of the lower die lip 2232 is cleaned by driving the scraping member 22421 to move back and forth on the surface of the lower die lip 2232 by the scraping power member 22422.

Specifically, the mold scraping power part 22422 comprises a downward moving power part 224221 with a power end connected with the mold scraping part 22421, and a power screw 224222, wherein a thread penetrates through the downward moving power part 224221 and is installed on the machine base 221.

In this embodiment, the power screw rod 224222 is driven by a servo motor to rotate, so that the scraper module 22421 moves back and forth along the length direction of the lower die lip 2232, and the downward moving power piece 224221, which is preferably an air cylinder, drives the scraper module 22421 to move up and down, so as to reach the surface of the lower die lip 2232 for cleaning.

As shown in fig. 8, the material cleaning assembly 2243 includes: a drive seat 22431; a side cleaning unit 22432, which drives the side cleaning unit 22432 holding the front and rear sides of the wiper member 22421, to be mounted on the driving seat 22431; the end cleaning assembly 22433 drives the end cleaning assembly 22433 which elastically clamps the left end and the right end of the scraping module 22421 to be installed on the driving seat 22431; and a lifting driving assembly 22434, wherein the lifting driving assembly 22434 driving the driving seat 22431 to reciprocate up and down is installed on the base 221.

In this embodiment, in the process of cleaning the surface of the scraping module 22421, the material cleaning assembly 2243 first raises the driving seat 22431 by the lifting driving assembly 22434, preferably an air cylinder, and makes the side cleaning assembly 22432 reach both sides of the scraping module 22421 and clamp them, and then the end cleaning assembly 22433 elastically clamps both sides of the end of the scraping module 22421, and while the lifting driving assembly 22434 moves downward, the side cleaning assembly 22432 and the end cleaning assembly 22433 move downward, and clean the surface of the scraping module 22421.

It should be added that the side cleaning assembly 22432 includes a side cleaning plate 224321 and a side cleaning power member 224322 driving the side cleaning plate 224321 to move back and forth, and the side cleaning power member 224322 is preferably an air cylinder.

It should be added that the end cleaning assembly 22433 is preferably an end cleaning member 224331, a moving seat 224332, a spring 224333 elastically connecting the end cleaning member 224331 with the moving seat 224332, and an end cleaning power member 224334 driving the moving seat 224332 to move back and forth, and the end cleaning power member 224334 is preferably a cylinder.

Example two

As shown in fig. 3, in which the same or corresponding components as in the first embodiment are denoted by the same reference numerals as in the first embodiment, only the points of difference from the first embodiment will be described below for the sake of convenience. The second embodiment is different from the first embodiment in that:

the homogenization assembly 12 comprises: a blowing unit 121 for blowing hot air to the extrudate to make the extrudate adhere to the surface of the casting roll 11; a scraping member 122 installed below the blowing assembly 121, the scraping member 122 being tangentially arranged at a blowing side and positioned above the extrudate; and the material collecting assembly 123 is used for collecting the scraped materials of the scraping member 122, and the material collecting assembly 123 is arranged on the scraping member 122.

In this embodiment, when the homogenizing assembly 12 processes the extrudate, the blowing assembly 121 blows the falling extrudate with a hot air flow, so that the extrudate can be sufficiently attached to the casting roll 11, the scraping member 122 scrapes the thickness of the heated and melted extrudate during the casting process, and the scraped extrudate is gradually collected by the collecting assembly 123 along with the rise of the height.

As shown in fig. 4, the receiving assembly 123 includes: a material receiving chamber 1231 provided on the scraping member 122; the material collecting roller 1232 is rotatably arranged above the scraping piece 122, and the material collecting roller 1232 is positioned at an opening at one side of the material collecting chamber 1231; and a material carrying space 1233 is circumferentially distributed on the material receiving roller 1232.

In this embodiment, when the material collecting assembly 123 performs the collection process after scraping, the material collecting roller 1232 is driven to rotate by the power of the preferred servo motor, and the material carrying space 1233 carries the scraping material to be sent to the material collecting chamber 1231 for collection.

EXAMPLE III

As shown in fig. 12, a method for producing a breathable film by using a casting forming device of the degradable breathable film comprises the following steps:

feeding, namely melting and extruding master batches to a die lip assembly 22 through a die head assembly 21 and discharging;

step two, die lip alternation, the lower die lip assembly 223 performs extrusion action on blanking, then the upper die lip assembly 222 firstly reaches the two sides of the extrusion channel 2211, then leaves towards the two sides in the thickness direction, withdraws towards one side in the width direction, then enables the lower die lip 2232 to reach the two sides of the extrusion channel 2211 again, then enables the upper die lip 2221 to leave the two sides of the extrusion channel 2211 in the width direction, performs extrusion control again by using the lower die lip 2232, and repeats the above steps;

step three, die lip cleaning is carried out, the heat preservation chamber 2241 is used for preserving heat of the moved lower die lip 2232, meanwhile, the die scraping component 2242 is cleaned along the length direction of the lower die lip 2232, and after cleaning is finished, the material cleaning component 2243 is used for cleaning the die scraping component 2242, and then the die scraping component 2242 is recycled;

and step four, discharging and homogenizing, wherein the extrudate continuously falls onto the casting roller 11 through the die lip assembly 22 and is processed and attached to the casting roller 11 through hot air of the blowing assembly 121, the material scraping piece 122 scrapes off redundant parts according to the preset thickness, the material collecting roller 1232 rotates to enable the redundant materials to be brought into the material collecting chamber 1231 through the material carrying space 1233 along with accumulation of redundant materials, and then the extrudate is cooled, subjected to thickness measurement, traction, edge cutting, corona treatment and then wound.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims (10)

1. The casting forming equipment of the degradable breathable film is characterized by comprising a film processing assembly and an extrusion assembly;

the extrusion assembly includes:

a die head assembly for continuously conveying the blanking; and

the die lip assembly is used for switching the extrusion position back and forth and cleaning and is arranged on one side of the bottom of the die head assembly;

the membrane treatment assembly comprises:

the casting roller is arranged below the die lip assembly; and

and the homogenizing assembly is used for scraping and recovering the extrudate in a liquid state and is arranged on the discharging side of the die lip assembly to the casting roller.

2. The casting forming equipment of degradable breathable film according to claim 1, wherein,

the die lip assembly comprises:

the middle of the base, which is arranged below the die head assembly, is provided with an extrusion channel;

the upper die lip assembly reciprocates back and forth along the extrusion thickness direction to adjust the extrusion thickness and is arranged on one side of the bottom of the die head assembly;

the lower die lip assembly is arranged on one side of the bottom of the upper die lip assembly, and leaves the extrusion channel along the extrusion thickness direction, withdraws along the extrusion width direction and then reaches the extrusion channel again; and

and the cleaning assemblies are used for cleaning the inflection point of the die orifice of the withdrawn lower die lip assembly and are arranged at two sides of the lower die lip assembly.

3. The casting equipment for the degradable breathable film according to claim 2, wherein,

go up the die lip subassembly and include:

the upper die lips are distributed on two sides of the extrusion channel, and the end surfaces of the upper die lips are obliquely arranged; and

and the upper die driving assembly is arranged on the base and is arranged on the base.

4. The casting forming equipment of degradable breathable film according to claim 3,

the lower die lip assembly includes:

the guide rail is arranged on the base;

the lower die lips are arranged on two sides of the extrusion channel, the tops of the lower die lips which are obliquely arranged on the end surfaces of the lower die lips and the upper die lip are arranged in a sliding manner, and one side of the bottoms of the lower die lips are arranged in the guide rail in a sliding manner; and

and the lower die driving assembly is used for driving the lower die lip to reciprocate along the guide rail and is arranged on the base.

5. The casting forming equipment of degradable breathable film according to claim 2,

the cleaning assembly comprises:

the heat insulation cavity corresponding to the lower die lip is arranged on two sides of the base;

the scraping module is used for cleaning along the length direction of the lower die lip and is arranged on the machine base; and

and the material cleaning component is used for removing materials from the scraping die component and is arranged at the tail end of the stroke of the scraping die component.

6. The casting forming equipment of degradable breathable film according to claim 5,

the wiper die assembly includes:

the two sides of the scraping mould respectively correspond to the inclined side end part of the lower mould lip; and

and the scraping power part drives the scraping module to adjust the height of the scraping die and moves the scraping die towards the length direction of the lower die lip, and is arranged on the machine base.

7. The casting forming equipment of degradable breathable films according to claim 6,

the clear material subassembly includes:

a driving seat;

the side cleaning components are used for driving and clamping the front side and the rear side of the scraping module and are arranged on the driving seat;

the end cleaning assembly drives the end cleaning assemblies which elastically clamp the left end and the right end of the scraping module to be arranged on the driving seat; and

and the lifting driving component drives the driving seat to reciprocate up and down and is arranged on the base.

8. The casting apparatus for degradable gas permeable membranes according to any one of claims 1 to 7, wherein,

the homogenization assembly comprises:

a blowing assembly for blowing hot air to the extrudate to make the extrudate close to the surface of the casting roller;

the scraping piece is arranged on one side of the blowing air tangentially and positioned above the extruded material and is arranged below the blowing assembly; and

the material collecting assembly is used for scraping the material scraping piece and collecting the scraped material, and the material collecting assembly is arranged on the material scraping piece.

9. The casting forming equipment of degradable breathable film according to claim 8,

receive the material subassembly includes:

the material receiving cavity is arranged on the scraping piece; and

the material receiving roller is rotatably arranged above the scraping piece and is positioned at an opening at one side of the material receiving cavity;

and material carrying spaces are distributed on the material receiving roller in the circumferential direction.

10. The method for producing the breathable film by using the casting forming equipment of the degradable breathable film according to claim 9, is characterized by comprising the following steps of:

feeding, namely melting and extruding master batches to a die lip assembly through a die head assembly and discharging;

secondly, die lips are alternated, the lower die lip assembly extrudes the discharged materials, then the upper die lip assembly firstly reaches the two sides of the extrusion channel, then the upper die lip assembly leaves the two sides in the thickness direction and withdraws towards one side in the width direction, the lower die lip is made to reach the two sides of the extrusion channel again, then the upper die lip leaves the two sides in the width direction of the extrusion channel, the lower die lip is used for carrying out extrusion control again, and the process is repeated;

cleaning the die lip, cleaning the die scraping assembly along the length direction of the lower die lip while the heat preservation chamber preserves the heat of the moved lower die lip, and after the cleaning is finished, cleaning the die scraping assembly by the material cleaning assembly, and then recycling the die scraping assembly;

and step four, discharging and homogenizing, wherein the extrudate continuously falls onto the casting roller through the die lip assembly and is processed and attached to the casting roller by hot air of the blowing assembly, the material scraping piece scrapes off redundant parts according to the preset thickness, the material receiving roller rotates to enable the redundant materials to be brought into the material receiving chamber through the material carrying space along with accumulation of the redundant materials, and then the extruded materials are cooled, measured in thickness, pulled, cut edge, subjected to corona treatment and then wound.

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