CN104275790A - 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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CN104275790A
CN104275790A CN201410500329.4A CN201410500329A CN104275790A CN 104275790 A CN104275790 A CN 104275790A CN 201410500329 A CN201410500329 A CN 201410500329A CN 104275790 A CN104275790 A CN 104275790A
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core
runner
internal layer
middle level
plug
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CN104275790B (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 Three-layer co-extrusion plastic film blow molding machine head with Assembled rotary plug and layering binary channels attemperating unit
Technical field
The present invention relates to the blow molding machine head producing three-layer co-extruded composite plastic film, be specifically related to the method for improvement to the helix core rod structure of head and the temperature control of each layer core, be particularly suitable for producing of three floor height precision Coextruded blown films.
Background technology
Along with improving constantly high polymer extrusion film performance requirement in the continuous appearance of high polymer new material and market, the film of one-component often can not meet the requirement using and process economically.Use multi-layer co-extruded technique multilayer can be had the material of different qualities, after the plasticizing of multiple stage extruder, be jointly squeezed in a composite machine head and converge.By blowing, cooling, the operation such as draw and batch, the composite function film of the best 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 the accurate control of the temperature of each layer material, can make the combination property of laminated film be improved.In a broad scope, rebuild the structure of film, the range of choice of base material is more extensive, and each Rotating fields combination of film is flexibly convenient, 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 the added value of film, simplifies the flow process of combination process, decrease investment, and make the quality of film more stable.
Multi-layer blown film technique mainly for the production of food packaging Obstruct membrane, plurality of layers of double to directional retraction film, hollow preservative film, geomembrane, the heavily loaded film of packaging, diaphragm seal, stretched film, bale packing film etc.These films have purposes widely in the field such as packaging, agricultural booth, water conservancy, environmental project of food, medicine, daily chemical products.
Multi-layer blown film film is primarily of compositions such as base material, barrier material and adhesives.This patent for binding site, sets forth the common technology difficult point how solved in Multi-layer blown film film producing process with three-layer co-extruded inflation film.
Common technology difficult point in Multi-layer blown film film producing process: its core is the runner design of composite machine head, what should ensure that material exports from head entrance to mouth mould falls with the time of staying equal along stroke pressure; When ensureing that the fused materials of each component converges in the runner of recombination region, each layer melt is consistent with uniformity of temperature profile at the axial flow velocity of mouth mould circumference, and thickness deviation is little, without the vestige of stream; Ensure that the faying face place shear stress of each layered material stream is consistent, mechanical stress and the thermal stress of melt are less; The temperature difference of each layered material stream should be made in addition unsuitable excessive, and when adjacent layer melting point resin, viscosity differ larger, if each layered material temperature control is improper, the resin poor to some heat endurance likely forms decomposition layer, occurs without brilliant point.Wish that each layer flow channel can carry out independent temperature for this reason.
Summary of the invention
For the problem of the plastic material multilayer complex films processing that performance differs greatly, present invention achieves the MULTILAYER COMPOSITE blown-film die controlled based on Assembled rotary plug and plurality of layers of double passage independent temperature.By to the flow of heat carrier and the control of temperature in the conduction oil runner arranged in each layer core of composite machine head and cooling medium runner, the accurate control to stream zone temperature in each composite bed runner can be achieved, guarantee temperature of charge in set point of temperature district to obtain optimal flow state.Head center plug can configure the screwing element of different configuration and geometric parameter according to the rheological behavior of different material and thermodynamic behaviour, according to the requirement of different technology conditions, the rotary speed of adjustment center plug, promote material with certain pressure and speed to the flowing of mouth mould direction, avoid the not smooth and circumferential skewness problem of the flowing caused due to too long in flow due to innermost layer material.By the science configuration of the screwing element of the different configuration of combined type plug and geometric parameter, the adjustment of center plug rotating speed, by internal layer core and middle level core, the semicircle sprue of ring-type of middle level core and outer core composition, multistage parallel manifold, the independence of the zone temperature in the reasonable disposition of multiple thread variable cross-section runner and voltage stabilizing district transition runner and the scientific algorithm of parameter and each laminar flow road controls, effectively can control the axial and circumferential flow velocity of the material of each layer different performance, pressure, shear stress between the time of staying and each layer, eliminate stream vestige and brilliant point.Thus improve the quality of item of final composite membrane.
Device involved in the present invention is as accompanying drawing 1, and this equipment comprises:
Gas blow pipe entrance 1, rotatable center plug 2, bottom hush panel 3, thrust bearing 4, internal layer core 5, the semicircle sprue 51 of internal layer core ring-type, the parallel manifold 52 of internal layer core single order, the parallel manifold 53 of internal layer core second order, the parallel menifold 55 of internal layer core three rank parallel menifold 54 internal layer core quadravalence, internal layer core multiple thread variable cross-section runner 56, internal layer core voltage stabilizing district transition runner 57, middle level material inlet device 6, middle level core 7, the semicircle sprue 71 of 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 74 in middle level core three rank, the parallel menifold 75 of middle level core quadravalence, middle level core multiple thread variable cross-section runner 76, core voltage stabilizing district, middle level transition runner 77, outer core 8, compound runner external mold 9, gas blow pipe outlet 10, nut 11, compound runner internal mold 12, outer skin materials inlet device 13 and internal layer material inlet device 14.
Overall compound blown-film die is fixed by screws on pedestal, and gas blow pipe entrance is connected with pressure-air feeder.Pressure-air is blown into from gas blow pipe entrance, through the appendix in the plug of rotatable center, from gas blow pipe outlet blowout.Plug lower end, rotatable center is connected with stepless speed change device by shaft coupling, according to technological requirement, can rotate, promoted by internal layer material to mouth mould direction with setting speed.
Rotatable center plug is connected with internal layer core by thrust bearing, and bottom hush panel is connected with internal layer core by bolt.Internal layer material inlet device one end is connected with internal layer core by screw, and one end is connected with the outlet of internal layer material extruder.Internal layer core is connected with middle level core by screw.Material inlet device one end, middle level is connected with middle level core by screw, and one end is connected with the outlet of middle level material extruder.Middle level core is connected with outer core by screw.Outer skin materials inlet device one end is connected with outer core by screw, and one end is connected with the outlet of outer skin materials extruder.Compound runner external mold is connected with outer core by screw, and compound runner internal mold is connected with rotatable center plug by screw.Gas blow pipe outlet is connected with compound runner internal mold by screw.The semicircle sprue that internal layer core 5, middle level core 7 are formed, the multistage parallel manifold of internal layer core, internal layer core multiple thread variable cross-section runner 56 and voltage stabilizing district transition runner; By middle level core 7, outer core 8 formed semicircle sprue, the multistage parallel manifold of middle level core, middle level core multiple thread variable cross-section runner 76 and voltage stabilizing district transition runner to;
Head is provided with three material inlets, be respectively the internal layer material inlet A in accompanying drawing 1, middle level material inlet B, outer skin materials entrance C, wherein internal layer material inlet device, middle level material inlet device, outer skin materials inlet device are connected with the outlet of extruder of corresponding material respectively.Internal layer material enters head from internal layer material inlet device, is promoted to flow to mouth mould direction by rotatable center plug.Middle level material enters head from middle level material inlet device, and ring-type semicircle sprue, multistage parallel manifold, multiple thread variable cross-section runner and voltage stabilizing district transition runner via internal layer core and middle level core composition flow to mouth mould direction; Outer skin materials enters head from outer skin materials inlet device, flows to mouth mould direction via middle level core, the semi-circular shape sprue of outer core composition, multistage parallel manifold, multiple thread variable cross-section runner and voltage stabilizing district transition runner.Configuration and the parameter of the semicircle sprue be made up of internal layer core and middle level core, middle level core and outer core, multistage parallel manifold, multiple thread variable cross-section runner and voltage stabilizing district transition runner are determined, the choosing of the shape of the exponent number of such as parallel manifold, the head number of runner and inclination angle, variable cross-section and transition runner gap, voltage stabilizing district, all have to pass through scientific algorithm, what should ensure that material exports from head entrance to voltage stabilizing district transition runner falls with the time of staying equal along stroke pressure.When the physical property of material and technique change, the present invention can be regulated by the correction in the cross sectional shape of runner and transition runner gap, voltage stabilizing district.
Recombination region runner is together constituted by internal layer core, middle level core, outer core, compound runner external mold and compound runner inner membrance, three kinds of materials flow out respectively from respective runner, converge in the runner of recombination region, then flow out from the mouth mould exit on head top.
When the material of different component realizes coextrusion, due to the resin melting temperature of different component and processing and forming temperature difference very large, have even more than 80 DEG C, the present invention is provided with heat medium and the binary channels runner of cooling medium of distribution of evenly turning back in internal layer core, middle level core, outer core for this reason.Can realize respectively accurately controlling the temperature of internal layer material, middle level material and outer skin materials, in accompanying drawing 1, D mouth is outer core heat medium runner entrance, and E mouth is outer core cooling medium flow channel entry point; H mouth is internal layer core heat medium runner entrance, and I mouth is internal layer core cooling medium flow channel entry point; F mouth is middle level core heat medium runner entrance, and G mouth is middle level core cooling medium flow channel entry point.Heat medium can use conduction oil or hexylene glycol, and cooling medium can use demineralized water or low temperature conduction oil.Bracket in figure represents it is cannot see and the entrance that rearview can be seen from front view angle.
For realizing controlling internal layer material, middle level material and outer skin materials temperature independently, in internal layer core 5, middle level core 7, outer core 8, be provided with heat medium runner and the cooling medium runner of distribution of evenly turning back; Heat medium and cooling medium two media temperature range be 10-20 DEG C;
Be through hole in the middle part of the plug of rotatable center, for placing gas blow pipe.Gas blow pipe two ends are connected by sliding bearing with the endoporus of rotatable center plug, and sliding bearing adopts grease lubrication.Rotatable center plug 2 adopts the Combination Design mode of mandrel, screwing element, and draw ratio controls at 6-10; Suggestion is between 6-8.Rotatable center plug 2 comprises multiple screwing element, and 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 diminishes gradually along Flow of Goods and Materials direction, 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 forward conveying screwing elements, and 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, and the spiral shell rib Ying Yuan degree of slipping over of each screwing element, without dead angle.
The structure chart of internal layer core and middle level plug and external expansion figure are as shown in Figure 2, internal layer core is by the semicircle sprue 51 of internal layer core ring-type, the parallel manifold 52 of internal layer core single order, the parallel manifold 53 of internal layer core second order, the parallel menifold 54 in internal layer core three rank, the parallel menifold 55 of internal layer core quadravalence, internal layer core multiple thread variable cross-section runner 56, internal layer core voltage stabilizing district transition runner 57 forms, middle level core is by the semicircle sprue 71 of 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 74 in middle level core three rank, the parallel menifold 75 of middle level core quadravalence, middle level core multiple thread variable cross-section runner 76, core voltage stabilizing district, middle level transition runner 77 forms.
The heat medium of distribution of evenly turning back arranged in internal layer core, middle level core, outer core and the binary channels runner of cooling medium launch schematic diagram as shown in Figure 3.
At middle level core and outer core, between internal layer core and middle level core, construct the ectomesoderm material flow path be made up of semicircle sprue, multistage parallel manifold, multiple thread variable cross-section runner and voltage stabilizing district transition runner; By the exponent number of parallel manifold, the head number of runner and inclination angle, the shape of variable cross-section and the configuration of voltage stabilizing district transition runner gap parameter, in change, the Flow Field Distribution state of outer stream, falling along stroke pressure of finally making each particle of fused materials export from head entrance to voltage stabilizing district transition runner keeps equal with the time of staying.
When the physical property of material and technique change, Bian with by each floor independently binary channels temperature control system temperature regulate, the pressure of center plug compressed air and the adjustment of flow, the rotary speed changing pivot plug and hauling speed, the cross sectional shape of correction runner and transition runner gap, voltage stabilizing district, one of this eight measure of combining form of screwing element or two or more measure on the plug of adjustment center, realize producing of the laminated film of different physical property plastics.
The three-layer plastic Film laminated blown-film die of above-mentioned band Assembled rotary plug and layering binary channels independent temperature system, similar mechanism is suitable for multilayer plastic film compound blown-film die equally.
Accompanying drawing explanation
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 the heat medium of the distribution of evenly turning back that embodiment 1 is arranged in internal layer core, middle level core, outer core and the binary channels runner expansion schematic diagram of cooling medium.
Fig. 4 is embodiments of the invention 2.
Detailed description of the invention
Embodiment 1
Fig. 1 is one embodiment of the present of invention, forms for the production of by three kinds of variety classes plastic materials, and the sandwich diaphragm that different materials rheological property difference is larger.Overall compound blown-film die is bolted on pedestal, and gas blow pipe entrance is connected with pressure-air feeder.Pressure-air is blown into from gas blow pipe entrance, through the appendix in the plug of rotatable center, from gas blow pipe outlet blowout.Plug lower end, rotatable center is connected with stepless speed change device with sprocket wheel by key, according to technological requirement, can rotate, promoted by internal layer material to mouth mould direction with setting speed.Middle level material enters head from middle level material inlet device, and ring-type semicircle sprue, multistage parallel manifold, multiple thread variable cross-section runner and voltage stabilizing district transition runner via internal layer core and middle level core composition flow to mouth mould direction; Outer skin materials enters head from outer skin materials inlet device, flows to mouth mould direction via middle level core, the semi-circular shape sprue of outer core composition, multistage parallel manifold, multiple thread variable cross-section runner and voltage stabilizing district transition runner.
Recombination region runner is together constituted by internal layer core, middle level core, outer core, compound runner external mold and compound runner inner membrance, three kinds of materials flow out respectively from respective runner, converge in the runner of recombination region, then flow out from the mouth mould exit on head top.
Rotatable center plug is connected with internal layer core by thrust bearing, and bottom hush panel is connected with internal layer core by bolt.Internal layer material inlet device one end is connected with internal layer core by screw, and one end is connected with the outlet of internal layer material extruder.Internal layer core is connected with middle level core by screw.Material inlet device one end, middle level is connected with middle level core by screw, and one end is connected with the outlet of middle level material extruder.Middle level core is connected with outer core by screw.Outer skin materials inlet device one end is connected with outer core by screw, and one end is connected with the outlet of outer skin materials extruder.Compound runner external mold is connected with outer core by screw, and compound mouth mould internal mold is connected with rotatable center plug by screw.Gas blow pipe outlet is connected with compound runner internal mold by screw.
Three kinds of different plastic materials are sent into three material inlets of head by respective extruder, i.e. internal layer material inlet A, middle level material inlet B, outer skin materials entrance C, the diameter of three entrances is 10-30mm.Because internal layer Flow of Goods and Materials is distant, rotatable center plug initially rotates according to the setting speed of 5-20 rev/min, and extrudes situation adjustment according to composite membrane.
Be provided with equally distributed conduction oil runner and cooling water flow conduits in internal layer core, middle level core, outer core, can independent temperature control be carried out.D mouth is outer core conduction oil flow channel entry point, and E mouth is outer core cooling water flow conduits entrance; H mouth is internal layer core conduction oil flow channel entry point, and I mouth is internal layer core cooling water flow conduits entrance; F mouth is middle level core conduction oil flow channel entry point, and G mouth is middle level core cooling water flow conduits entrance.
Rotatable center plug adopts the Combination Design mode of mandrel, screwing element, and plug screw diameter 100mm, draw ratio is 6.Use the forward conveying screwing element that 4 helical pitches are identical, each screwing element draw ratio is 1.5, and groove depth is 1/6 times of screw diameter.The exterior circumferential profile stretch-out view of internal layer core and middle level plug as shown in Figure 2.The heat medium of distribution of evenly turning back arranged in internal layer core, middle level core, outer core and the binary channels runner of cooling medium launch schematic diagram as shown in Figure 3.
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:
Poor or the heat sensitive material for mobility, need to shorten the time of staying of material in flow channel as far as possible, need the flow channel length shortening middle level core and internal layer core for this reason, therefore in example 2 of the present invention, A, B, C tri-extruders are placed in same level position, the angle at adjacent two extruders center is 120 °, by a feeding distributor 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, material inlet A, middle level material inlet B, outer skin materials entrance C namely, the diameter of three entrances is about 10-30mm.Pivot plug initially rotates according to the setting speed of 5-20 rev/min, and extrudes situation adjustment according to composite membrane.
Rotatable center plug adopts the building block system Combination Design mode of mandrel and screwing element, and adopt 4 forward conveying screwing elements, screwing element is about as 1-2 helical pitch.The helical pitch of two screwing elements in upper end is identical, and lead angle is 17 degree 42 points, and groove depth is about 1/8 times of screw diameter, and length is about 1 times of helical pitch.Two, lower end screwing element helical pitch is larger than upper end.Not etc., draw ratio is not about 1.5, and groove depth is also 1/8 times of screw diameter for the helical pitch of two screwing elements in lower end.Middle level material enters head from middle level material inlet device, and ring-type semicircle sprue, multistage parallel manifold, multiple thread variable cross-section runner and voltage stabilizing district transition runner shape sprue via internal layer core and middle level core composition flow to mouth mould direction; Outer skin materials enters head from outer skin materials inlet device, and ring-type semicircle sprue, multistage parallel manifold, multiple thread variable cross-section runner and voltage stabilizing district transition runner via middle level core, outer core composition flow to mouth mould direction.When the physical property of material and technique change, the present invention can realize producing of the innovation complex thin film structure of broad material scope by measures such as the combining forms of screwing element on the cross sectional shape of the independently pressure of binary channels temperature control system temperature and center plug compressed air and the adjustment of flow of each floor, the rotary speed changing pivot plug and hauling speed, correction runner and transition runner gap, voltage stabilizing district, adjustment center plug.

Claims (6)

1., with a three-layer plastic Film laminated blown-film die for Assembled rotary plug and layering binary channels independent temperature system, it is characterized in that:
Comprise gas blow pipe entrance (1), rotatable center plug (2), bottom hush panel (3), thrust bearing (4), internal layer core (5), the semicircle sprue (51) of internal layer core ring-type, the parallel manifold of internal layer core single order (52), the parallel manifold of internal layer core second order (53), the internal layer core three rank parallel menifold of parallel menifold (54) internal layer core quadravalence (55), internal layer core multiple thread variable cross-section runner (56), internal layer core voltage stabilizing district transition runner (57), middle level material inlet device (6), middle level core (7) outer core (8), compound runner external mold (9), gas blow pipe outlet (10), nut (11), compound runner internal mold (12), outer skin materials inlet device (13) and internal layer material inlet device (14),
The internal layer core (5) of compound blown-film die, middle level core (7), outer core (8) are fixed on pedestal respectively by screw, and gas blow pipe entrance (1) is connected with pressure-air feeder; Pressure-air is blown into from gas blow pipe entrance (1), through the appendix in rotatable 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), and bottom hush panel (3) is connected with internal layer core (5) by bolt; Internal layer material inlet device (14) one end is connected with internal layer core (5) by screw, and one end is connected with the outlet of internal layer material extruder; Internal layer core (5) is connected with middle level core (7) by screw; Material inlet device (6) one end, middle level 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) is connected with outer core (8) by screw; Outer skin materials inlet device (13) one end is connected with outer core (8) by screw, and one end is connected with the outlet of outer skin materials extruder; Compound runner external mold (9) is connected with outer core (8) by screw, and compound runner internal mold (12) is connected with rotatable center plug (2) by nut (11); Gas blow pipe outlet (10) is connected with compound runner internal mold (12) by screw; The semicircle sprue that internal layer core (5), middle level core (7) are formed, the multistage parallel manifold of internal layer core, internal layer core multiple thread variable cross-section runner (56) and voltage stabilizing district transition runner; By middle level core (7), outer core (8) formed semicircle sprue, the multistage parallel manifold of middle level core, middle level core multiple thread variable cross-section runner (76) and voltage stabilizing district transition runner to;
Head is provided with three material inlets, be respectively internal layer material inlet (A), middle level material inlet (B), outer skin materials entrance (C), they are corresponding with corresponding internal layer material inlet device (14), middle level material inlet device (6), outer skin materials inlet device (13) respectively.
2. three-layer plastic Film laminated blown-film die according to claim 1, is characterized in that: plug (2) lower end, rotatable center is connected with stepless speed changing driver by shaft coupling, can carry out speed governing according to direction initialization; Internal layer material enters head from internal layer material inlet device (14), promoted to flow to mouth mould direction by rotatable center plug (2), middle level material enters head from middle level material inlet device (6), flows along semicircle sprue, the multistage parallel manifold of internal layer core, internal layer core multiple thread variable cross-section runner (56) and the voltage stabilizing district transition runner formed by internal layer core (5), middle level core (7) to mouth mould direction; Outer skin materials enters head from outer skin materials inlet device (13), flows along the semicircle sprue formed by middle level core (7), outer core (8), the multistage parallel manifold of middle level core, middle level core multiple thread variable cross-section runner (76) and voltage stabilizing district transition runner to mouth mould direction; At the mouth mould place on head top, recombination region runner is together form by internal layer core (5), middle level core (7), outer core (8), compound runner external mold (9), compound runner internal mold (12), three kinds of materials flow out respectively from respective runner, in the runner of recombination region, converge sizing, then flow out from head exit.
3. a kind of three-layer plastic Film laminated blown-film die with rotating plug and layering independent temperature system according to claim 1, it is characterized in that: rotatable center plug (2) adopts the Combination Design mode of mandrel, screwing element, and draw ratio controls at 6-10;
Rotatable center plug (2) comprises multiple screwing element, each screwing element external diameter is identical, and draw ratio scope is 1.5-2, and number of starts is single head or bull, screw channel volume diminishes gradually along Flow of Goods and Materials direction, and groove depth is 1/10-1/5 times of screw diameter.
4. a kind of three-layer plastic compound blown-film die with Assembled rotary plug and layering binary channels independent temperature system according to claim 1, it is characterized in that: for realizing controlling internal layer material, middle level material and outer skin materials temperature independently, in internal layer core (5), middle level core (7), outer core (8), be provided with heat medium runner and the cooling medium runner of distribution of evenly turning back; Heat medium and cooling medium two media temperature range be 10-20 DEG C.
5. a kind of three-layer plastic compound blown-film die with Assembled rotary plug and layering binary channels independent temperature system according to claim 1, is characterized in that: at middle level core and outer core, construct the ectomesoderm material flow path be made up of semicircle sprue, multistage parallel manifold, multiple thread variable cross-section runner and voltage stabilizing district transition runner between internal layer core and middle level core; By the exponent number of parallel manifold, the head number of runner and inclination angle, the shape of variable cross-section and the configuration of voltage stabilizing district transition runner gap parameter, in change, the Flow Field Distribution state of outer stream, falling along stroke pressure of finally making each particle of fused materials export from head entrance to voltage stabilizing district transition runner keeps equal with the time of staying.
6. a kind of three-layer plastic compound blown-film die with Assembled rotary plug and layering binary channels independent temperature system according to claim 1, it is characterized in that: when the physical property of material and technique change, Bian with by each layer independently binary channels temperature control system temperature regulate, the pressure of center plug compressed air and the adjustment of flow, change rotary speed and the hauling speed of pivot plug, revise cross sectional shape and the transition runner gap, voltage stabilizing district of runner, one of this eight measure of combining form of screwing element or two or more measure on the plug of adjustment center, realize producing of the laminated film of different physical property plastics.
CN201410500329.4A 2014-09-26 2014-09-26 Three-layer co-extrusion plastic film blow molding machine head with combined type rotary core rod and layered two-channel temperature control device Active CN104275790B (en)

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CN113290820B (en) * 2021-05-25 2023-03-10 昆明电立电缆有限公司 Cable extrusion double-layer deviation-adjustment-free co-extrusion machine head and processing technology thereof
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CN113787700A (en) * 2021-08-13 2021-12-14 重庆沃特智成新材料科技有限公司 Film blowing device
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