CN104275790B - Three-layer co-extrusion plastic film blow molding machine head with combined type rotary core rod and layered two-channel temperature control device - Google Patents

Three-layer co-extrusion plastic film blow molding machine head with combined type rotary core rod and layered two-channel temperature control device Download PDF

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Publication number
CN104275790B
CN104275790B CN201410500329.4A CN201410500329A CN104275790B CN 104275790 B CN104275790 B CN 104275790B CN 201410500329 A CN201410500329 A CN 201410500329A CN 104275790 B CN104275790 B CN 104275790B
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core
runner
internal layer
middle level
layer core
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CN104275790A (en
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江波
张冰
邹永刚
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Beijing University of Chemical Technology
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Beijing University of Chemical Technology
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Abstract

The invention discloses a three-layer co-extrusion plastic film blow molding machine head with a combined type rotary core rod and a layered two-channel temperature control device and relates to the field of molding of multi-layer plastic composite films. The machine head comprises a rotary core rod with combined thread elements, wherein materials in a middle layer and an outer layer respectively enter the machine head by virtue of material inlet devices in the middle layer and the outer layer and compositely flow towards a hole mold by virtue of a semi-circular annular main runner formed by core molds in the inner layer and the middle layer and core molds in the middle layer and the outer layer, multistage parallel branch pipes, a multi-head thread section-variable branch runner and a pressure-stabilization area transition runner; a heating and cooling system capable of independently controlling the temperature is arranged on the core mold in each layer. By virtue of measures of changing the rotation speed of the rotary core rod, the combination of the thread elements, the stage number of the parallel branch pipes, the number of heads and the inclined angle of each branch runner and modifying the section shape of each branch runner and a gap of the pressure-stabilization area transition runner, three types of plastic melts are same in process pressure drop, stay time and shear stress at a composite interface during flowing from the machine head inlet to the hole mold, so that plastic composite films with different properties are produced.

Description

A kind of with Assembled rotary plug and layering the three-layer co-extruded of dual pathways attemperating unit mould Material film blowing head
Technical field
The present invention relates to producing the blow molding machine head of three-layer co-extruded composite plastic film and in particular to helix core rod to head The improvement of structure and the method for each layer core temperature control, are particularly suitable for producing of three floor height precision Coextruded blown films.
Background technology
Constantly carrying to high polymer extrusion film performance requirement in emergence with high polymer new material and market Height, the thin film of one-component tends not to economically meet the requirement using and processing.Can will be many using multi-layer co-extruded technique Layer has the material of different qualities, after the plasticizing of multiple stage extruder, is jointly squeezed in a composite machine head and converges.By blowing The operation such as mould, cool down, draw and batch, the composite function film of the optimal cost performance of production that can be most economical.
By the innovative design of composite co-extruding blow molding machine head structure, effective adjustment of each layer film thickness, and each layer thing The precise control of the temperature of material, can make the combination property of laminated film be improved.In a broad scope, rebuild The structure of thin film, the range of choice of base material is more extensive, and each Rotating fields combination of film is convenient flexibly, and cost is cheaper. The good characteristic of different material can be carried out complementation by it, can obtain performance and the outward appearance of particular/special requirement, such as oxygen and damp proof High barrier, coloring, heat insulating ability.Thermoforming and heat bonding ability, intensity, rigidity, hardness and penetration-resistant, not only increase Added the added value of thin film, simplified the flow process of combination process, decreased investment, and make thin film quality more stable.
Multi-layer blown film technique is mainly for the production of food packaging Obstruct membrane, multi-layer biaxially oriented directional retraction film, hollow Preservative film, geomembrane, packaging heavy duty film, diaphragm seal, stretched film, bale packing film etc..These films are in food, medicine, daily chemical products Packaging, agricultural booth, water conservancy, the field such as environmental project have extensive purposes.
Multi-layer blown film thin film is mainly made up of base material, barrier material and binding agent etc..This patent is blown with three-layer co-extruded Moulding thin film is binding site, illustrates how to solve the common technology difficult point in Multi-layer blown film thin film producing process.
Common technology difficult point in Multi-layer blown film thin film producing process: its core is that the runner of composite machine head sets Meter, should ensure that material exports from head entrance to mouth mould equal along stroke pressure fall and the time of staying;Ensure the melting of each component When material converges in the runner of recombination region, each layer melt is consistent with uniformity of temperature profile in the axial flow velocity of mouth mould circumference, thickness Deviation is little, no the vestige of stream;Ensure at the faying face of each layered material stream that shear stress is consistent, the mechanical stress of melt and thermal stress Less;The temperature difference of each layered material stream additionally should be made unsuitable excessive, when adjacent layer melting point resin, viscosity difference are larger, if each layer It is improper that material temperature controls, and the resin poor to some heat stability is likely to form decomposition layer, no fisheye.Wish each layer for this Flow channel can carry out independent temperature.
Content of the invention
The problem of the plastic material multilayer complex films processing differing greatly for performance, present invention achieves be based on combination type Rotating mandrel and the MULTILAYER COMPOSITE blown-film die of multilamellar dual pathways independent temperature control.By in each layer core to composite machine head The conduction oil runner of setting and the flow of cooling medium runner interior-heat carrier and the control of temperature, it is possible to achieve to each composite bed In runner stream zone temperature precise control it is ensured that temperature of charge in set point of temperature area to obtain optimal flow state.Head Center plug can configure the screw thread unit of different configuration and geometric parameter according to the rheological behavior of different material and thermodynamic behaviour Part, according to the requirement of different technology conditions, adjusts the rotary speed of center plug, promote material with certain pressure and speed to Mouthful mould direction flowing, it is to avoid due to innermost layer material because the not smooth and circumferentially distributed inequality of flowing that too long in flow leads to is asked Topic.By the scientific allocation of combination type plug different configuration and the screwing element of geometric parameter, the regulation of center plug rotating speed, by The ring-type semicircle sprue of internal layer core and middle level core, middle level core and outer layer core composition, multistage parallel manifold, many The scientific algorithm of the reasonable disposition of head thread variable cross-section sub-runner and voltage stabilizing area transition runner and parameter and the subregion in each laminar flow road The independent control of temperature, can with the axial and circumferential flow velocity of the material of effective control each layer different performance, pressure, the time of staying with And the shear stress between each layer, eliminate stream vestige and fisheye.Thus improving the quality of item of final composite membrane.
Device involved in the present invention such as accompanying drawing 1, this equipment includes:
Air blowing tube inlet 1, rotatable center plug 2, bottom hush panel 3, thrust bearing 4, internal layer core 5, internal layer core Ring-type semicircle sprue 51, the parallel manifold of internal layer core single order 52, the parallel manifold of internal layer core second order 53, internal layer core The parallel menifold 55 of the parallel menifold of three ranks 54 internal layer core quadravalence, internal layer core multiple thread variable cross-section sub-runner 56, internal layer The semicircle sprue 71 of core voltage stabilizing area transition runner 57, middle level material inlet device 6, middle level core 7, middle level core ring-type, The parallel manifold 72 of middle level core single order, the parallel manifold 73 of middle level core second order, the parallel menifold of middle level core three rank 74, in The parallel menifold of floor core quadravalence 75, middle level core multiple thread variable cross-section sub-runner 76, middle level core voltage stabilizing area transition runner 77th, outer layer core 8, compound runner external mold 9, gas blow pipe outlet 10, nut 11, compound runner internal model 12, outer skin materials entrance dress Put 13 and internal layer material inlet device 14.
Overall compound blown-film die is fixed by screws on pedestal, air blowing tube inlet and pressure-air feeder phase Even.Pressure-air is blown into from air blowing tube inlet, through the appendix in the plug of rotatable center, exports blowout from gas blow pipe. Rotatable center plug lower end is connected with stepless speed change device by shaft coupling, can be rotated with setting speed according to technological requirement, Internal layer material is promoted to mouth mould direction.
Rotatable center plug is connected with internal layer core by thrust bearing, and bottom hush panel passes through bolt and internal layer core It is connected.Internal layer material inlet device one end is connected with internal layer core by screw, the outlet phase of one end and internal layer material extruder Even.Internal layer core is connected with middle level core by screw.Middle level material inlet device one end is connected with middle level core by screw, One end is connected with the outlet of middle level material extruder.Middle level core is connected with outer layer core by screw.Outer skin materials entrance fills Put one end to be connected with outer layer core by screw, one end is connected with the outlet of outer skin materials extruder.Compound runner external mold passes through Screw is connected with outer layer core, and compound runner internal model is connected with rotatable center plug by screw.Spiral shell is passed through in gas blow pipe outlet Nail is connected with compound runner internal model.The semicircle sprue that internal layer core 5, middle level core 7 are formed, internal layer core are multistage parallel Manifold, internal layer core multiple thread variable cross-section sub-runner 56 and voltage stabilizing area transition runner;Formed by middle level core 7, outer layer core 8 The multistage parallel manifold of semicircle sprue, middle level core, middle level core multiple thread variable cross-section sub-runner 76 and voltage stabilizing area mistake Cross runner to;
Head is provided with three material inlets, the internal layer material inlet a respectively in accompanying drawing 1, middle level material inlet b, outer layer Material inlet c, wherein internal layer material inlet device, middle level material inlet device, outer skin materials inlet device respectively with homologue The outlet of extruder of material is connected.Internal layer material from internal layer material inlet device enter head, by rotatable center plug promote to The flowing of mouth mould direction.Middle level material enters head from middle level material inlet device, forms via internal layer core and middle level core Ring-type semicircle sprue, multistage parallel manifold, multiple thread variable cross-section sub-runner and voltage stabilizing area transition runner are to mouth mould side To flowing;Outer skin materials enter head from outer skin materials inlet device, via the semi-circular shape of middle level core, outer layer core composition Sprue, multistage parallel manifold, multiple thread variable cross-section sub-runner and voltage stabilizing area transition runner flow to mouth mould direction.By interior The semicircle sprue of layer core and middle level core, middle level core and outer layer core composition, multistage parallel manifold, multiple thread The configuration of variable cross-section sub-runner and voltage stabilizing area transition runner and parameter determination, the exponent number of such as parallel manifold, the head of sub-runner Number and inclination angle, the shape of variable cross-section and voltage stabilizing area transition runner gap selection, all have to pass through scientific algorithm, should ensure that thing It is equal along stroke pressure fall and the time of staying that material exports from head entrance to voltage stabilizing area transition runner.Physical property and technique when material When changing, the present invention can be adjusted by the correction of the cross sectional shape of sub-runner and voltage stabilizing area transition runner gap.
Together constituted compound by internal layer core, middle level core, outer layer core, compound runner external mold and compound runner inner membrance Area's runner, three kinds of materials flow out respectively from respective runner, converge, then from the mouth mould on head top in the runner of recombination region Exit is flowed out.
When coextrusion realized by the material of different component, due to resin melting temperature and the processing and forming temperature of different component It is very different, even more than 80 DEG C having, be provided with internal layer core, middle level core, outer layer core uniformly for this present invention Turn back distribution heating medium and cooling medium dual pathways runner.Can realize respectively to internal layer material, middle level material and outer The temperature of layer material is accurately controlled, and in accompanying drawing 1, d mouth heats medium runner entrance for outer layer core, and e mouth is outer layer core Cooling medium runner entrance;H mouth heats medium runner entrance for internal layer core, and i mouth is internal layer core cooling medium runner entrance; F mouth heats medium runner entrance for middle level core, and g mouth is middle level core cooling medium runner entrance.Heating medium can use Conduction oil or hexanediol, cooling medium can use softened water or low temperature conduction oil.It is from front view angle that the bracket of in figure represents Spend entrance invisible and that rearview can be seen.
For realizing to internal layer material, middle level material and outer skin materials temperature control independently, internal layer core 5, in It is provided with heating medium runner and the cooling medium runner of distribution of uniformly turning back in layer core 7, outer layer core 8;Heating medium and Cooling medium two media temperature range be 10-20 DEG C;
It is through hole in the middle part of the plug of rotatable center, for placing gas blow pipe.Gas blow pipe two ends and rotatable center plug Endoporus is connected by sliding bearing, and sliding bearing adopts grease lubrication.Rotatable center plug 2 adopts mandrel, screwing element Modular design mode, draw ratio controls in 6-10;Suggestion is between 6-8.Rotatable center plug 2 includes multiple screwing elements, Each screwing element external diameter is identical, and draw ratio scope is 1.5-2, and number of starts is single head or bull, and screw channel volume is along material stream Dynamic direction tapers into, and groove depth is 1/10-1/5 times of screw diameter.
According to the requirement of design function, the rotatable center plug in Fig. 1 uses 4 positive conveying screwing elements, each Screwing element draw ratio is 1.5-2, and groove depth is between 1/10 to 1/5 times of screw diameter.The volume of screw channel should progressively reduce, each spiral shell The spiral shell rib Ying Yuan degree of slipping over of texel part, no dead angle.
As shown in Figure 2, internal layer core is by internal layer core for the structure chart of internal layer core and middle level plug and external expansion figure Ring-type semicircle sprue 51, the parallel manifold of internal layer core single order 52, the parallel manifold of internal layer core second order 53, internal layer core The parallel menifold of three ranks 54, the parallel menifold of internal layer core quadravalence 55, internal layer core multiple thread variable cross-section sub-runner 56, internal layer Core voltage stabilizing area transition runner 57 forms, and middle level core is by middle level core ring-type semicircle sprue 71, middle level core single order simultaneously Connection formula manifold 72, the parallel manifold 73 of middle level core second order, the parallel menifold of middle level core three rank 74, middle level core quadravalence are in parallel Formula menifold 75, middle level core multiple thread variable cross-section sub-runner 76, middle level core voltage stabilizing area transition runner 77 form.
The heating medium of distribution of uniformly turning back of setting and cooling medium in internal layer core, middle level core, outer layer core Dual pathways runner expanded schematic diagram as shown in Figure 3.
Construct between middle level core and outer layer core, internal layer core and middle level core by semicircle sprue, multistage The middle outer layer material flow path of parallel manifold, multiple thread variable cross-section sub-runner and voltage stabilizing area transition runner composition;In parallel The configuration of the exponent number of formula manifold, the head number of sub-runner and inclination angle, the shape of variable cross-section and voltage stabilizing area transition runner gap parameter, In change, the Flow Field Distribution state of outer layer stream, finally make each particle of fused materials from head entrance to voltage stabilizing area transition runner Dropping along stroke pressure of outlet keeps equal with the time of staying.
When the physical property of material and technique change, adjusted with the dual pathways temperature control system temperature independent by each layer The regulation of section, the pressure of center plug compressed air and flow, the rotary speed changing center of rotation plug and hauling speed, Revise screwing element on the cross sectional shape of sub-runner and voltage stabilizing area transition runner gap, adjustment center plug combining form this eight One of measure or two or more measure, realize the producing of laminated film of different physical property plastics.
The above-mentioned three-layer plastic Film laminated inflation film manufacturing machine with Assembled rotary plug and layering dual pathways independent temperature system Head, similar mechanism is equally applicable to multilayer plastic film and is combined blown-film die.
Brief description
Fig. 1 is the embodiment of the present invention 1 head front view.
Fig. 2 (a) is the structure chart of embodiment 1 internal layer core.
Fig. 2 (b) is the structure chart of embodiment 1 middle level core.
Fig. 2 (c) is the exterior circumferential expanded view of embodiment 1 internal layer core runner.
Fig. 3 is that the heating of the distribution of uniformly turning back that embodiment 1 is arranged in internal layer core, middle level core, outer layer core is situated between The dual pathways runner expanded schematic diagram of matter and cooling medium.
Fig. 4 is embodiments of the invention 2.
Specific embodiment
Embodiment 1
Fig. 1 is one embodiment of the present of invention, is made up of three kinds of variety classes plastic materials for producing, and different materials The larger sandwich diaphragm of rheological property difference.Overall compound blown-film die is bolted on pedestal, air blowing tube inlet It is connected with pressure-air feeder.Pressure-air is blown into from air blowing tube inlet, through the gas transmission in the plug of rotatable center Pipe, exports blowout from gas blow pipe.Rotatable center plug lower end is connected with sprocket wheel and stepless speed change device by key, can be according to work Skill requires, and with setting speed rotation, internal layer material is promoted to mouth mould direction.Middle level material enters from middle level material inlet device Head, cuts via the ring-type semicircle sprue of internal layer core and middle level core composition, multistage parallel manifold, multiple thread change Face sub-runner and voltage stabilizing area transition runner flow to mouth mould direction;Outer skin materials enter head, warp from outer skin materials inlet device The semi-circular shape sprue that is made up of middle level core, outer layer core, multistage parallel manifold, multiple thread variable cross-section sub-runner and Voltage stabilizing area transition runner flows to mouth mould direction.
Together constituted compound by internal layer core, middle level core, outer layer core, compound runner external mold and compound runner inner membrance Area's runner, three kinds of materials flow out respectively from respective runner, converge, then from the mouth mould on head top in the runner of recombination region Exit is flowed out.
Rotatable center plug is connected with internal layer core by thrust bearing, and bottom hush panel passes through bolt and internal layer core It is connected.Internal layer material inlet device one end is connected with internal layer core by screw, the outlet phase of one end and internal layer material extruder Even.Internal layer core is connected with middle level core by screw.Middle level material inlet device one end is connected with middle level core by screw, One end is connected with the outlet of middle level material extruder.Middle level core is connected with outer layer core by screw.Outer skin materials entrance fills Put one end to be connected with outer layer core by screw, one end is connected with the outlet of outer skin materials extruder.Compound runner external mold passes through Screw is connected with outer layer core, and compound mouth mould internal model is connected with rotatable center plug by screw.Spiral shell is passed through in gas blow pipe outlet Nail is connected with compound runner internal model.
Three kinds of different plastic materials are sent into three material inlets of head, i.e. internal layer material inlet by respective extruder A, middle level material inlet b, outer skin materials entrance c, a diameter of 10-30mm of three entrances.Due to internal layer Flow of Goods and Materials distance relatively Far, rotatable center plug initially rotates according to 5-20 rev/min of setting speed, and is carried out according to the extrusion situation of composite membrane Adjustment.
It is provided with equally distributed conduction oil runner and cooling water flow conduits in internal layer core, middle level core, outer layer core, can enter The independent temperature control of row.D mouth is outer layer core conduction oil flow channel entry point, and e mouth is outer layer core cooling water flow conduits entrance;H mouth is internal layer Core conduction oil flow channel entry point, i mouth is internal layer core cooling water flow conduits entrance;F mouth is middle level core conduction oil flow channel entry point, g Mouth is middle level core cooling water flow conduits entrance.
Rotatable center plug adopts mandrel, the modular design mode of screwing element, plug screw diameter 100mm, major diameter Than for 6.Using 4 helical pitch identicals positive conveying screwing element, each screwing element draw ratio is 1.5, and groove depth is 1/6 times of spiral shell Shank diameter.The exterior circumferential profile stretch-out view of internal layer core and middle level plug is as shown in Figure 2.Internal layer core, middle level core, The heating medium of the distribution of uniformly turning back of setting and the dual pathways runner expanded schematic diagram such as accompanying drawing 3 of cooling medium in outer layer core Shown.
Embodiment 2
Fig. 4 is embodiments of the invention 2, carries out three layers of compound blown film processing for the plastics materials poor to mobility. Embodiment 2 difference from Example 1 is:
For mobility is poor or heat sensitive material, need to try one's best and shorten the time of staying in flow channel for the material, be This needs to shorten the flow channel length of middle level core and internal layer core, therefore in the example 2 of the present invention, by tri- extruders of a, b, c It is placed in same level position, the angle at adjacent two extruderses center is 120 °, by a feeding allotter from inside Respectively to semi-circular shape sprue feed.
Three kinds of different plastic materials are sent into three material inlets of head by respective extruder, that is, interior material inlet a, Middle level material inlet b, outer skin materials entrance c, the diameter of three entrances is about 10-30mm.Center of rotation plug is initially according to 5- 20 revs/min of setting speed rotation, and be adjusted according to the extrusion situation of composite membrane.
Rotatable center plug adopts the building block system modular design mode of mandrel and screwing element, using 4 positive conveyings Screwing element, screwing element length is about 1-2 helical pitch.The helical pitch of two screwing elements in upper end is identical, and lead angle is 17 degree 42 Point, groove depth is about 1/8 times of screw diameter, and length is about 1 times of helical pitch.Lower end two screwing element helical pitch is bigger than upper end.Lower end The helical pitch of two screwing elements, draw ratio is about 1.5, and groove depth is also 1/8 times of screw diameter.Middle level material is from middle level material Inlet device enter head, via internal layer core and middle level core composition ring-type semicircle sprue, multistage parallel manifold, Multiple thread variable cross-section sub-runner and voltage stabilizing area transition runner shape sprue flow to mouth mould direction;Outer skin materials are from outer skin materials Inlet device enter head, via middle level core, outer layer core composition ring-type semicircle sprue, multistage parallel manifold, Multiple thread variable cross-section sub-runner and voltage stabilizing area transition runner flow to mouth mould direction.When the physical property of material and technique change When, the present invention can be by the pressure of the independent dual pathways temperature control system temperature of each layer and center plug compressed air and flow Regulation, change the rotary speed of center of rotation plug and hauling speed, the cross sectional shape revising sub-runner and the transition of voltage stabilizing area On runner gap, adjustment center plug, the measure such as combining form of screwing element is realizing the innovation THIN COMPOSITE of broad material scope The producing of membrane structure.

Claims (6)

1. a kind of three-layer plastic Film laminated inflation film manufacturing machine with Assembled rotary plug and layering dual pathways independent temperature system Head it is characterised in that:
Including air blowing tube inlet (1), rotatable center plug (2), bottom hush panel (3), thrust bearing (4), internal layer core (5), internal layer core ring-type semicircle sprue (51), the parallel manifold of internal layer core single order (52), internal layer core second order are in parallel Formula manifold (53), the parallel menifold of internal layer core three rank (54), the parallel menifold of internal layer core quadravalence (55), internal layer core bull Screw thread variable cross-section sub-runner (56), internal layer core voltage stabilizing area's transition runner (57), middle level material inlet device (6), middle level core (7), outer layer core (8), compound runner external mold (9), gas blow pipe outlet (10), nut (11), compound runner internal model (12), outer layer Material inlet device (13) and internal layer material inlet device (14);The parallel manifold of internal layer core single order (52), internal layer core two The parallel manifold of rank (53), the parallel menifold of internal layer core three rank (54), the parallel menifold of internal layer core quadravalence (55) are referred to as The multistage parallel manifold of internal layer core;
The internal layer core (5) of compound blown-film die, middle level core (7), outer layer core (8) are fixed by screws in pedestal respectively On, air blowing tube inlet (1) is connected with pressure-air feeder;Pressure-air is blown into from air blowing tube inlet (1), through revolving Turn the appendix in center plug (2), from gas blow pipe outlet (10) blowout;
Rotatable center plug (2) is connected with internal layer core (5) by thrust bearing (4), bottom hush panel (3) pass through bolt with Internal layer core (5) is connected;Internal layer material inlet device (14) one end is connected with internal layer core (5) by screw, one end and internal layer The outlet of material extruder is connected;Internal layer core (5) is connected with middle level core (7) by screw;Middle level material inlet device (6) One end is connected with middle level core (7) by screw, and one end is connected with the outlet of middle level material extruder;Middle level core (7) passes through Screw is connected with outer layer core (8);Outer skin materials inlet device (13) one end is connected with outer layer core (8) by screw, one end Outlet with outer skin materials extruder is connected;Compound runner external mold (9) is connected with outer layer core (8) by screw, compound runner Internal model (12) is connected with rotatable center plug (2) by nut (11);Gas blow pipe outlet (10) passes through screw and compound runner Internal model (12) is connected;Internal layer core (5), middle level core (7) formation internal layer core ring-type semicircle sprue, internal layer core are multistage Parallel manifold, internal layer core multiple thread variable cross-section sub-runner (56) and internal layer core voltage stabilizing area transition runner;By middle level core Mould (7), outer layer core (8) form semicircle sprue, the multistage parallel manifold of middle level core, the change section of middle level core multiple thread Face sub-runner (76) and voltage stabilizing area transition runner to;
Head is provided with three material inlets, respectively internal layer material inlet (a), middle level material inlet (b), outer skin materials entrance (c), they respectively with internal layer material inlet device (14), middle level material inlet device (6), outer skin materials inlet device (13) phase Corresponding.
2. three-layer plastic Film laminated blown-film die according to claim 1 it is characterised in that: rotatable center plug (2) lower end is connected with stepless speed changing driver by shaft coupling, can carry out speed governing according to direction initialization;Internal layer material is from internal layer Material inlet device (14) enters head, is promoted to the flowing of mouth mould direction by rotatable center plug (2), middle level material is from middle level Material inlet device (6) enters head, along the semicircle sprue being formed by internal layer core (5), middle level core (7), internal layer core The multistage parallel manifold of mould, internal layer core multiple thread variable cross-section sub-runner (56) and voltage stabilizing area transition runner flow to mouth mould direction Dynamic;Outer skin materials enter head from outer skin materials inlet device (13), along half being formed by middle level core (7), outer layer core (8) The multistage parallel manifold of circular sprue, middle level core, middle level core multiple thread variable cross-section sub-runner (76) and voltage stabilizing area mistake Cross runner to flow to mouth mould direction;At the mouth mould on head top, by internal layer core (5), middle level core (7), outer layer core (8), it is combined runner external mold (9), compound runner internal model (12) together form recombination region runner, three kinds of materials are respectively from respective Flow out in runner, converge sizing in the runner of recombination region, then flow out from head exit.
3. three-layer plastic Film laminated blown-film die according to claim 1 it is characterised in that: rotatable center plug (2) mandrel, the modular design mode of screwing element are adopted, draw ratio controls in 6-10;
Rotatable center plug (2) includes multiple screwing elements, and each screwing element external diameter is identical, and draw ratio scope is 1.5-2, Number of starts is single head or bull, and screw channel volume tapers into along Flow of Goods and Materials direction, and groove depth is 1/10-1/5 times of screw diameter.
4. three-layer plastic Film laminated blown-film die according to claim 1 it is characterised in that: for realize to internal layer thing Material, middle level material and outer skin materials temperature control independently, in internal layer core (5), middle level core (7), outer layer core (8) Inside it is provided with heating medium runner and the cooling medium runner of distribution of uniformly turning back;Heating medium and cooling medium two media Temperature range be 10-20 DEG C;
5. three-layer plastic Film laminated blown-film die according to claim 1 it is characterised in that: in middle level core and outer layer Construct multistage in parallel by internal layer core ring-type semicircle sprue, internal layer core between core, internal layer core and middle level core The middle level material stream of formula manifold, internal layer core multiple thread variable cross-section sub-runner and internal layer core voltage stabilizing area transition runner composition Road;And built by middle level core (7), outer layer core (8) formed semicircle sprue, the multistage parallel manifold of middle level core, Middle level core multiple thread variable cross-section sub-runner (76) and voltage stabilizing area transition runner are to the outer skin materials runner forming;
By the exponent number of the multistage parallel manifold of internal layer core, the head number of internal layer core multiple thread variable cross-section sub-runner and inclination Angle, the shape of variable cross-section of internal layer core multiple thread variable cross-section sub-runner and internal layer core voltage stabilizing area transition runner gap parameter Configuration;By the exponent number of the multistage parallel manifold of middle level core, the head number of middle level core multiple thread variable cross-section sub-runner and Inclination angle, the shape of variable cross-section of middle level core multiple thread variable cross-section sub-runner and middle level core voltage stabilizing area transition runner gap The configuration of parameter, in change, the Flow Field Distribution state of outer layer stream, finally makes each particle of fused materials from head entrance to voltage stabilizing Dropping along stroke pressure of area's transition runner outlet keeps equal with the time of staying.
6. three-layer plastic Film laminated blown-film die according to claim 1 it is characterised in that: when physical property and the work of material When skill changes, with the pressure of the dual pathways temperature control system temperature adjustment independent by each layer, center plug compressed air The regulation of power and flow, the rotary speed changing rotatable center plug and hauling speed, revise sub-runner cross sectional shape and Voltage stabilizing area transition runner gap, adjust on rotatable center plug one of this eight measure of combining form of screwing element or two kinds with Upper measure, realizes the producing of laminated film of different physical property plastics.
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