CN214645740U - Special blown film device is crowded altogether to environmental protection rich mineral paper multilayer - Google Patents

Abstract

The utility model discloses a special environment-friendly stone paper multilayer co-extrusion film blowing device, belonging to the technical field of novel material equipment manufacturing; the device consists of a main extruder, an inner-outer layer auxiliary extruder, a rotary die head and a control system, wherein the rotary die head consists of an outer die nozzle, an inner die nozzle, an outer die body, an outer core, a middle core, an inner core, a flow distribution plate and a flow distribution cone which are connected; the outer core, the middle core and the inner core are sequentially and rotatably connected with the inner part of the outer die body from outside to inside to form an outer layer runner, a middle layer runner and an inner layer runner; the discharge end of the outer die body is connected with the outer die nozzle and the inner die nozzle to form a discharge flow channel, and the feed end is connected with the flow distribution plate and the flow distribution cone to convey feeding materials. The utility model discloses the device is exclusively used in crowded blown film production altogether of multilayer environmental protection stone paper, adopts a main two pairs of extruders to cooperate the rotatory die head of three-layer to crowd after the blown film shaping altogether to cooperate the compound stone paper that produces different uses of three-layer runner design, and production efficiency is high, the range of application is extensive.

Description

Special blown film device is crowded altogether to environmental protection rich mineral paper multilayer

Technical Field

The utility model relates to a blown film manufacturing process equipment of stone paper, concretely relates to environmental protection stone paper multilayer is crowded special blown film device altogether belongs to novel material equipment and makes technical field.

Background

The stone paper is a novel material between paper and plastic, can replace the traditional partial functional paper and professional paper, and can also replace the traditional most plastic packing materials; the method has the characteristics of low cost and controllable degradation, can save a large amount of cost for users, and does not produce pollution. The environment-friendly new material stone paper has wide material availability, product upgrading, technology improvement and wide application field space.

The original stone paper is produced by 80% of CaCO3 and 20% of PE, the environment-friendly stone paper multilayer co-extrusion technology is more applied in the production of a tape casting process (tape casting process: a plastic film production process, raw materials are plasticized and melted by an extruder, extruded by a T-shaped structure forming die and cast to the roll surface of a cooling roller rotating stably in a sheet shape, a membrane is cooled and cooled on the cooling roller for shaping, and then the product is rolled after traction and edge cutting), but the production efficiency is lower. The blown film process production (blown film is a plastic processing method, which means a plastic processing process of heating and melting plastic particles and then blowing the plastic particles into a film, generally adopts a tubular film blank formed by extruding a polymer, blowing the tubular film to a required thickness by high-pressure air in a better melt flowing state, and forming the tubular film into the film after cooling and shaping), and is applied to more other materials but almost not applied to environment-friendly stone paper; when the film blowing and paper making technology is used, only one material is used, the product is single, the application range is small, and different requirements of various customers can not be completely met, such as food packaging bags, paper for advertisement and photo, paper for film-coated adhesive tapes and the like. Technical equipment upgrades are urgently needed to meet various requirements for stone paper applications.

SUMMERY OF THE UTILITY MODEL

The utility model aims at: overcome the product that stone paper exists in blown film papermaking equipment production single, the narrow and small problem of range of application, a special blown film device is crowded altogether to environmental protection stone paper multilayer is provided, adopt the crowded blown film production of multilayer environmental protection stone paper is exclusively used in to a main two pairs of extruders cooperation three-layer rotary die heads, the requirement of various differences can be satisfied according to the different materials of requirement interpolation in the inlayer under the unchangeable condition of the inherent characteristic of assurance stone paper, produce the stone paper of different uses after the blown film shaping, can satisfy the blown film production application of 90um-150um various environmental protection stone paper, and easy operation, high production efficiency, wide application in food and drug packaging, reflective membrane, complex film and other fields.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the special environment-friendly stone paper multilayer co-extrusion film blowing device comprises a main extruder, an outer layer auxiliary extruder, an inner layer auxiliary extruder, a connecting rotary die head and a control system, wherein the rotary die head is formed by connecting an outer die nozzle, an inner die nozzle, an outer die body, an outer core, a middle core, an inner core, a splitter plate and a splitter cone; the outer core, the middle core and the inner core are sequentially and rotatably connected inside the outer die body from outside to inside, the outer walls of the three cores are connected inside the outer die body to form an outer layer runner, a middle layer runner and an inner layer runner respectively, and the outer layer runner and the inner layer runner are converged and communicated with the middle layer runner in the discharge end of the outer die body; the discharging end of the outer die body is connected with the outer die nozzle, the inner die nozzle is arranged in the outer die nozzle and fixedly connected to the discharging end part of the inner core, a discharging flow channel is formed between the inner die nozzle and the inner wall of the outer die nozzle, and the discharging flow channel is correspondingly communicated with the middle layer flow channel; the feeding end of the outer die body is connected with the splitter plate, the feeding end of the inner core vertically penetrates through the center of the splitter plate and is connected to the splitter cone, the outer auxiliary extruder is connected with the splitter plate through an outer feeding pipeline and conveys outer materials to the inner part of the outer runner, the inner auxiliary extruder is connected with the splitter plate through an inner feeding pipeline and conveys inner materials to the inner part of the inner runner, and the feeding port of the splitter cone is connected with the main extruder and conveys middle materials to the inner part of the middle runner through the splitter plate.

The outer wall of the outer core is provided with an outer core flow groove and an outer cone sharp corner, the inner wall of the outer core is provided with an inner circular surface of the outer core, the outer wall of the middle core is provided with a middle core flow groove, the inner wall of the middle core is provided with an inner cone sharp corner and an inner circular surface of the middle core, and the outer wall of the inner core is provided with an inner core flow groove and an outer cone seat; the outer layer flow channel consists of a fit clearance between the outer core flow channel and the outer taper angle and between the outer die body inner wall, the middle layer flow channel consists of a fit clearance between the middle core flow channel and the outer core inner circular surface, and the inner layer flow channel consists of a fit clearance between the inner core flow channel and the outer taper seat and between the inner taper angle and the middle core inner circular surface.

The chute is equallyd divide by the spiral at middle part to the outer core chute and is connected multistage crotch chute and right angle feeding flow hole and constitute, the inner core chute with the structure of outer core chute is the same, the spiral chute that the chute is two numbers is equallyd divide to the spiral, multistage crotch chute by with one-level crotch chute that right angle feeding flow hole is connected divide into two evenly distributed step by step and connect gradually second grade crotch chute and N level crotch chute and constitute.

The chute is equallyd divide to the spiral chute that the chute is eight runners and the spiral degree of depth is decremented in proper order to the discharge gate direction by the feed inlet, the multi-level crotch chute is the level four crotch chute and is the crotch shape of being divided into two between every higher level chute and the lower level chute and evenly disperses the structure.

The inclination spiral chute that the center core chute was eight runners and is located the feed end of center core outer wall, the spiral degree of depth of center core chute is decrement in proper order to the discharge gate direction by the feed inlet, and the spiral inclination is 1.45, and the spiral degree of depth inclination is 3.34.

The middle part of the flow distribution plate is provided with a central groove which is in penetrating connection with the inner core, the periphery of the central groove is vertically provided with an inner layer flow hole, a middle layer flow hole and an outer layer flow hole, two sides of the central groove are respectively and horizontally provided with an inner layer inlet hole and an outer layer inlet hole which are connected and communicated with the inner layer flow hole and the outer layer flow hole, and the interior of the flow distribution cone is formed by connecting the middle layer inlet hole with a conical flow passage; the outer layer feeding pipeline is connected with the outer layer inlet hole and communicated with the outer layer flow channel through the outer layer flow hole, the inner layer feeding pipeline is connected with the inner layer inlet hole and communicated with the inner layer flow channel through the inner layer flow hole, and the middle layer inlet hole is connected with the conical flow channel and communicated with the middle layer flow channel through the middle layer flow hole.

The middle layer flow holes vertically penetrate through the circular section corresponding to the conical flow channel and are uniformly distributed with six, and the section holes of the middle layer flow holes are of two crescent flow dividing structures which are buckled together.

The flow distribution plate is correspondingly provided with pin holes on the contact surface of the outer core and is connected and positioned through a pin shaft, the pin holes are arranged on the circumferential surface which is positioned on the same radius with the outer layer flow holes, and the included angle of the circle center is 12 degrees in the anticlockwise direction.

The middle layer runner is a straight runner, the width of the runner is larger than that of the outer layer runner and that of the inner layer runner, and the converging and communicating position of the outer layer runner and the middle layer runner is ahead of that of the inner layer runner and the middle layer runner.

The discharging flow channel is correspondingly communicated with the middle flow channel, the width of the flow channel of the feeding port is the same as that of the flow channel of the middle flow channel, the flow channel surface of the discharging flow channel is transited from the conical surface to the direct current surface from the feeding port to the discharging port, and the width of the flow channel of the feeding port is larger than that of the flow channel of the discharging port.

The utility model has the advantages that:

1) the utility model discloses the device adopts a main two pairs of extruder cooperation three-layer rotary die head to be exclusively used in the crowded blown film production altogether of multilayer environmental protection stone paper to under the unchangeable condition of the inherent characteristic of assurance stone paper through three-layer runner composite design, the ectonexine can add different materials as required and satisfy the demand of various differences, produces the stone paper of different usefulness after the blown film shaping, has solved the product singleness that stone paper exists in blown film papermaking equipment production, the narrow and small problem of range of application.

2) The utility model discloses to the special properties of preparation rich mineral paper material among the device, material mobility is poor after the melting, and film forming temperature is complicated, adopts spreader cone and flow distribution plate to improve material mobility problem and play the balanced effect of reposition of redundant personnel to utilize the modified characteristics of polymer interfacial chemistry principle and polymer, runner adopts equally divide 8 splitter boxes simultaneously behind the flow distribution plate, adopts the crotch structural connection by the 8 spiral launders of dark and shallow branch, makes the more even seeing off of material.

3) The utility model discloses inner core, well core and outer core among the device are along with rotary die head synchronous revolution, make the material be heated more rationally in the three-layer runner, and the steady propelling movement of material pressure is more smooth and easy, distributes more evenly, adopts rotary die head production more stable, and product quality is more excellent.

4) The utility model discloses special ejection of compact runner design between interior die orifice and the outer die orifice in the device, the perfect complex of accomplishing three kinds of materials that can be fine still can prevent that the main material refluence from causing the emergence of the condition such as vice material pressure increase demolding inhomogeneous.

5) The utility model discloses the position that outer runner and middle level runner join the intercommunication in the device is in advance in the position of the intercommunication that joins of inner runner and middle level runner, and pressure hedging when can avoiding two kinds of auxiliary materials to extrude the coating can cause the pressure variation of another party during the square pressure fluctuation, can appear that the square auxiliary material is sent out too much and another party's auxiliary material is too little, and unstable also uneven just can avoid the emergence of this kind of condition completely after staggering to make the production process more stable.

6) The utility model discloses a multilayer is crowded blown film device altogether can combine automatic temperature control system and bubble range finding thickness measurement system to realize automated production, makes the material one shot production shaping, does not need traditional compound and coating process, and production efficiency is high, greatly reduced manufacturing cost.

Drawings

Fig. 1 is a schematic structural view of the rotary die head of the present invention;

FIG. 2 is a cross-sectional view of the outer core of FIG. 1;

FIG. 3 is a schematic view of the external launder of FIG. 2;

FIG. 4 is a cross-sectional view of the core of FIG. 1;

FIG. 5 is a schematic view of the external launder construction of FIG. 4;

FIG. 6 is a top view of the flow distribution plate of FIG. 1;

FIG. 7 is a half sectional view of FIG. 6;

FIG. 8 is a schematic view of the structure of the laminar flow hole of FIG. 6.

In the figure, 1-outer die mouth, 2-inner die mouth, 3-outer die body, 4-outer core, 401-outer core runner, 4011-spiral equal diversion runner, 4012-multi-level crotch runner, 4013-right angle feed flow hole, 402-outer cone cusp, 403-inner core inner circular surface, 5-middle core, 501-middle core runner, 502-inner cone cusp, 503-inner core inner circular surface, 6-inner core, 601-inner core runner, 602-outer cone seat, 7-diversion plate, 701-center groove, 702-inner layer flow hole, 703-middle layer flow hole, 704-outer layer flow hole, 705-inner layer inlet hole, 706-outer layer inlet hole, 707-pin hole, 8-diversion cone, 801-middle layer inlet hole, 802-tapered flow channel, 9-outer layer flow channel, 10-middle layer flow channel, 11-inner layer flow channel, 12-discharge flow channel, 13-outer layer feeding pipeline and 14-inner layer feeding pipeline.

Detailed Description

The invention is further explained below with reference to the drawings and the embodiments.

Example (b): as shown in figures 1-8, an environmental protection rich mineral paper multilayer is crowded special blown film device altogether, connect rotary die head and control system by main extruder, outer vice extruder, the vice extruder of inlayer and constitute, rotary die head is connected by outer die nozzle 1, interior die nozzle 2, outer mould body 3, outer core 4, well core 5, inner core 6, flow distribution plate 7 and spreader 8 and is constituteed.

The outer core 4, the middle core 5 and the inner core 6 are sequentially and rotatably connected inside the outer die body 3 from outside to inside, the outer walls of the three cores are connected inside the outer die body 3 to form an outer layer runner 9, a middle layer runner 10 and an inner layer runner 11 respectively, and the outer layer runner 9 and the inner layer runner 11 are converged and communicated with the middle layer runner 10 in the discharge end of the outer die body 3; inner core 6, well core 5 and outer core 4 are along with rotary die head synchronous revolution, make the material be heated more rationally in the three-layer runner, and the steady propelling movement of material pressure is more smooth and easy, and it is more even to distribute, adopts rotary die head production more stable, and product quality is more excellent.

The outer wall of the outer core 4 is provided with an outer core flow groove 401 and an outer cone sharp corner 402, the inner wall is provided with an outer core inner circular surface 403, the outer wall of the middle core 5 is provided with a middle core flow groove 501, the inner wall is provided with an inner cone sharp corner 502 and a middle core inner circular surface 503, and the outer wall of the inner core 6 is provided with an inner core flow groove 601 and an outer cone base 602; the outer layer flow channel 9 is composed of a fit clearance between the outer core flow channel 401 and the outer taper angle 402 and the inner wall of the outer mold body 3, the middle layer flow channel 10 is composed of a fit clearance between the middle core flow channel 501 and the inner circular surface 403 of the outer core, and the inner layer flow channel 11 is composed of a fit clearance between the inner core flow channel 601 and the outer taper seat 602 and the inner taper angle 502 and the inner circular surface 503 of the middle core.

The outer core launder 401 is composed of a middle spiral equalization launder 4011 connected with a multi-level crotch launder 4012 and a right-angle feeding flow hole 4013, the inner core launder 601 has the same structure as the outer core launder 401, the spiral equalization launder 4011 is a double number of spiral launders, and the multi-level crotch launder 4012 is composed of a first-level crotch launder connected with the right-angle feeding flow hole 4013, and is divided into two step by step and uniformly distributed to be sequentially connected with a second-level crotch launder and an N-level crotch launder; the spiral distributing launder 4011 is an eight-runner spiral launder, the spiral depth decreases gradually from the feed inlet to the discharge outlet, the multi-level crotch launder 4012 is a four-level crotch launder, and a crotch-shaped uniform diverging structure is formed between each upper-level launder and each lower-level launder.

The central core flow groove 501 is an inclined angle spiral flow groove with eight flow channels and is positioned at the feeding end of the outer wall of the central core 5, the spiral depth of the central core flow groove 501 is gradually decreased from the feeding port to the discharging port, the spiral inclined angle is 1.45 degrees, and the spiral depth inclined angle is 3.34 degrees.

The discharging end of the outer die body 3 is connected with the outer die nozzle 1, the inner die nozzle 2 is arranged inside the outer die nozzle 1 and is fixedly connected to the discharging end part of the inner core 6, a discharging flow channel 12 is formed between the inner die nozzle 2 and the inner wall of the outer die nozzle 1, and the discharging flow channel 12 is correspondingly communicated with the middle layer flow channel 10; the middle layer runner 10 is a straight runner, the width of the runner is larger than the width of the outer layer runner 9 and the inner layer runner 11, the converging and communicating position of the outer layer runner 9 and the middle layer runner 10 is earlier than the converging and communicating position of the inner layer runner 11 and the middle layer runner 10, namely, the middle layer runner 10 firstly converges with the outer layer runner 9 and then jointly converges with the inner layer runner 11.

The special discharge flow channel 12 design between the inner die opening and the outer die opening can perfectly compound three materials, and the situations that the pressure of the auxiliary material is increased and the die is not uniform due to backflow of the main material and the like can be prevented. The position that outer runner 9 and middle level runner 10 converged the intercommunication is in advance in the position of the intercommunication that converges of inner runner 11 and middle level runner 10, and pressure hedging when can avoid two kinds of auxiliary materials to extrude the coating can cause the pressure variation of another party during the square pressure fluctuation, can appear that one side auxiliary material sends out too much and another party auxiliary material is too little, and is unstable also uneven, just can avoid the emergence of this kind of condition completely after the height staggers to make production process more stable.

The discharging flow passage 12 is correspondingly communicated with the middle flow passage 10, the width of the flow passage at the feeding port is the same as that of the flow passage at the feeding port, the flow passage surface of the discharging flow passage 12 is transited from a conical surface to a direct current surface from the feeding port to the discharging port, and the width of the flow passage at the feeding port is larger than that of the flow passage at the discharging port.

The feed end and the flow distribution plate 7 of outer die body 3 are connected, the feed end portion of inner core 6 runs through the center of flow distribution plate 7 perpendicularly and connects on spreader 8, outer vice extruder connects flow distribution plate 7 through outer charge-in pipeline 13 and carries outer material to outer runner 9 in, the vice extruder of inlayer connects flow distribution plate 7 through inlayer charge-in pipeline 14 and carries inlayer material to inlayer runner 11 in, the feed inlet and the main extruder of spreader 8 are connected and carry in middle level material to middle level runner 10 through flow distribution plate 7.

The middle part of the flow distribution plate 7 is provided with a central groove 701 which is connected with the inner core 6 in a penetrating way, the periphery of the central groove 701 is vertically provided with an inner layer flow hole 702, a middle layer flow hole 703 and an outer layer flow hole 704, the two sides are respectively and horizontally provided with an inner layer inlet hole 705 and an outer layer inlet hole 706 which are connected and communicated with the inner layer flow hole 702 and the outer layer flow hole 704, and the inside of the flow distribution cone 8 is formed by connecting the middle layer inlet hole 801 with a conical flow passage 802; the outer layer feed pipe 13 is connected with the outer layer inlet hole 706 and communicated with the outer layer flow channel 9 through the outer layer flow hole 704, the inner layer feed pipe 14 is connected with the inner layer inlet hole 705 and communicated with the inner layer flow channel 11 through the inner layer flow hole 702, and the middle layer inlet hole 801 is connected with the tapered flow channel 802 and communicated with the middle layer flow channel 10 through the middle layer flow hole 703; the middle layer flow holes 703 vertically penetrate the circular section of the corresponding tapered flow channel 802, six flow holes are uniformly distributed, and the section hole shape of the middle layer flow holes 703 is a crescent flow dividing structure formed by buckling two flow dividing structures.

The contact surface of the splitter plate 7 and the outer core 4 is correspondingly provided with a pin hole 707 and is connected and positioned through a pin shaft, the pin hole 707 is arranged on a circumferential surface which is positioned on the same radius with the outer layer flow hole 704, and the included angle of the circle center is 12 degrees in the counterclockwise direction.

Aiming at the special properties of materials for manufacturing stone paper, the fluidity of the materials after melting is poor, the film forming temperature is complex, the shunting cone 8 and the shunting plate 7 are adopted to improve the fluidity of the materials to play a role in shunting balance, the chemical principle of a high molecular interface and the characteristics of high molecular modification are utilized, 8 shunting grooves are uniformly distributed in a runner after passing through the shunting plate 7, and a crotch structure is adopted to connect 8 spiral grooves which are deeply and shallowly distributed, so that the materials are more uniformly discharged.

The production process comprises the following steps:

1. before starting up, selecting different materials according to the requirements of the composite film, and respectively adding the materials into the hoppers of the respective extruders; the inner layer, the middle layer and the outer layer are respectively provided with different raw materials by a main extruder and two auxiliary extruders which are independently controlled through special flow channel design, and feeding is conveniently controlled according to different characteristics of the raw materials.

Composite films suitable for food storage and preservation, composite films with excellent printing performance, composite films with barrier and bonding performance and the like can be produced according to different requirements.

2. After a main extruder and two auxiliary extruders respectively carrying inner-layer runners, middle-layer runners and outer-layer runners are heated to the extrusion temperature required by the materials, the main extruder is started to work at first, and the materials are extruded into the middle-layer runners.

3. And after the materials extruded by the main extruder are stable, drawing a film, blowing and molding, and then starting the inner-layer and outer-layer auxiliary extruders to work to extrude the materials.

4. The three-layer co-extrusion composite film is extruded stably, and a rotating motor is started to rotate slowly after film bubbles are uniform; generally, the thickness of the inner layer is 5-10um, the thickness of the middle layer is 80-120um, the thickness of the outer layer is 10-20um, and the total thickness of the composite film is 90-150 um.

5. The discharging of the discharging flow channel is more stable through rotation and control, the film bubble is more uniform, and the thickness difference of the inner layer and the outer layer is more reasonable.

6. And finally, realizing automatic production through an automatic temperature control system and a film bubble distance and thickness measuring system.

The utility model discloses the device adopts the rotatory die head of a main two pairs of extruders cooperation three-layer to be exclusively used in the crowded blown film production altogether of multilayer environmental protection stone paper, and can add different materials as required to satisfy the demand of various differences in the inlayer under the unchangeable circumstances of assurance stone paper inherent characteristic through three-layer runner composite design, produce the stone paper of different usefulness behind the blown film shaping, the product singleness of having solved stone paper in blown film papermaking equipment production, the narrow and small problem of range of application, and easy operation, high production efficiency, wide application in food medicine packing, reflective membrane, complex film and other fields.

The above description is only for the purpose of illustrating the technical solutions of the present invention and not for limiting the same, and other modifications or equivalent replacements made by the technical solutions of the present invention by those of ordinary skill in the art should be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solutions of the present invention.

Claims (10)

1. The utility model provides an environmental protection rich mineral paper multilayer is crowded special blown film device altogether, is connected rotary die head and control system by main extruder, outer vice extruder, the vice extruder of inlayer and constitutes its characterized in that: the rotary die head is formed by connecting an outer die nozzle (1), an inner die nozzle (2), an outer die body (3), an outer core (4), a middle core (5), an inner core (6), a splitter plate (7) and a splitter cone (8); the outer core (4), the middle core (5) and the inner core (6) are sequentially and rotatably connected to the inside of the outer die body (3) from outside to inside, the outer walls of the three cores are connected to the inside of the outer die body (3) to form an outer layer runner (9), a middle layer runner (10) and an inner layer runner (11) respectively, and the outer layer runner (9) and the inner layer runner (11) are converged and communicated with the middle layer runner (10) in the discharge end of the outer die body (3); the discharge end of the outer die body (3) is connected with the outer die nozzle (1), the inner die nozzle (2) is arranged inside the outer die nozzle (1) and is fixedly connected to the discharge end part of the inner core (6), a discharge runner (12) is formed between the inner die nozzle (2) and the inner wall of the outer die nozzle (1), and the discharge runner (12) is correspondingly communicated with the middle-layer runner (10); the feed end of outer die body (3) with flow distribution plate (7) are connected, the feed end portion of inner core (6) runs through perpendicularly flow distribution plate (7) the center and connect in on spreader cone (8), outer vice extruder is connected through outer charge-in pipeline (13) outer material extremely is carried to flow distribution plate (7) in outer runner (9), the vice extruder of inlayer is connected through inlayer charge-in pipeline (14) flow distribution plate (7) are carried the inlayer material extremely in inlayer runner (11), the feed inlet of spreader cone (8) with main extruder is connected and is passed through flow distribution plate (7) are carried the middle level material extremely in middle level runner (10).

2. The special environment-friendly rich mineral paper multilayer co-extrusion film blowing device as claimed in claim 1, wherein: the outer wall of the outer core (4) is provided with an outer core flow groove (401) and an outer cone sharp corner (402), the inner wall of the outer core is provided with an outer core inner circular surface (403), the outer wall of the middle core (5) is provided with a middle core flow groove (501), the inner wall of the middle core is provided with an inner cone sharp corner (502) and a middle core inner circular surface (503), and the outer wall of the inner core (6) is provided with an inner core flow groove (601) and an outer cone base (602); the outer layer flow channel (9) is composed of a fit clearance between the outer core flow channel (401) and the outer cone sharp corner (402) and the inner wall of the outer die body (3), the middle layer flow channel (10) is composed of a fit clearance between the middle core flow channel (501) and the inner core circular surface (403), and the inner layer flow channel (11) is composed of a fit clearance between the inner core flow channel (601) and the outer cone base (602) and the inner cone sharp corner (502) and the inner core circular surface (503).

3. The special environment-friendly rich mineral paper multilayer co-extrusion film blowing device as claimed in claim 2, wherein: outer core chute (401) divide chute (4011) equally by the spiral at middle part and connect multistage crotch chute (4012) and right angle inlet flow hole (4013) and constitute, inner core chute (601) with the structure of outer core chute (401) is the same, spiral chute that the spiral divides equally chute (4011) to be the dual number, multistage crotch chute (4012) by with one-level crotch chute that right angle inlet flow hole (4013) is connected divides one step by step into two evenly distributed and connects gradually second grade crotch chute and N level crotch chute and constitute.

4. The special environment-friendly rich mineral paper multilayer co-extrusion film blowing device as claimed in claim 3, wherein: chute (4011) is equallyd divide to the spiral and the spiral degree of depth of flow is decremented in proper order to the discharge gate direction by the feed inlet to the chute of eight runners, multistage crotch chute (4012) are the level four crotch chute and are the crotch shape of being divided into two between every higher level chute and the lower level chute evenly to disperse the structure.

5. The special environment-friendly rich mineral paper multilayer co-extrusion film blowing device as claimed in claim 2, wherein: well core chute (501) are the inclination spiral chute of eight runners and are located the feed end of well core (5) outer wall, the spiral degree of depth of well core chute (501) is decremented in proper order to the discharge gate direction by the feed inlet, and the spiral inclination is 1.45, and the spiral degree of depth inclination is 3.34.

6. The special environment-friendly rich mineral paper multilayer co-extrusion film blowing device as claimed in claim 1, wherein: a central groove (701) which is connected with the inner core (6) in a penetrating manner is arranged in the middle of the flow distribution plate (7), an inner layer flow hole (702), a middle layer flow hole (703) and an outer layer flow hole (704) are vertically arranged on the periphery of the central groove (701), an inner layer inlet hole (705) and an outer layer inlet hole (706) which are connected and communicated with the inner layer flow hole (702) and the outer layer flow hole (704) are horizontally arranged on two sides of the central groove respectively, and the flow distribution cone (8) is formed by connecting the middle layer inlet hole (801) with a conical flow channel (802); the outer layer feeding pipeline (13) is connected with the outer layer inlet hole (706) and is communicated with the outer layer flow channel (9) through the outer layer flow hole (704), the inner layer feeding pipeline (14) is connected with the inner layer inlet hole (705) and is communicated with the inner layer flow channel (11) through the inner layer flow hole (702), and the middle layer inlet hole (801) is connected with the conical flow channel (802) and is communicated with the middle layer flow channel (10) through the middle layer flow hole (703).

7. The special environment-friendly rich mineral paper multilayer co-extrusion film blowing device as claimed in claim 6, wherein: the middle layer flow holes (703) vertically penetrate through the circular section corresponding to the conical flow channel (802), a plurality of middle layer flow holes are uniformly distributed, and the section hole shape of the middle layer flow holes (703) is a crescent flow dividing structure which is buckled together.

8. The special environment-friendly rich mineral paper multilayer co-extrusion film blowing device as claimed in claim 6, wherein: the flow distribution plate (7) and the contact surface of the outer core (4) are correspondingly provided with pin holes (707) and are connected and positioned through a pin shaft, the pin holes (707) are arranged on the circumferential surface which is positioned on the same radius with the outer layer flow holes (704), and the included angle of the circle center is 12 degrees in the anticlockwise direction.

9. The special environment-friendly rich mineral paper multilayer co-extrusion film blowing device as claimed in claim 1, wherein: the middle-layer runner (10) is a direct-flow runner, the runner width is larger than that of the outer-layer runner (9) and the inner-layer runner (11), and the converging and communicating position of the outer-layer runner (9) and the middle-layer runner (10) is ahead of that of the inner-layer runner (11) and the middle-layer runner (10).

10. The special environment-friendly rich mineral paper multilayer co-extrusion film blowing device as claimed in claim 9, wherein: the discharging flow channel (12) is correspondingly communicated with the middle flow channel (10), the width of the flow channel of the feeding hole is the same as that of the flow channel, the flow channel surface of the discharging flow channel (12) is transited from the conical surface to the direct current surface from the feeding hole to the discharging hole, and the flow channel width of the feeding hole is larger than that of the discharging hole.

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