CN106956416A - A kind of film-extruding apparatus - Google Patents

A kind of film-extruding apparatus Download PDF

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Publication number
CN106956416A
CN106956416A CN201710107685.3A CN201710107685A CN106956416A CN 106956416 A CN106956416 A CN 106956416A CN 201710107685 A CN201710107685 A CN 201710107685A CN 106956416 A CN106956416 A CN 106956416A
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CN
China
Prior art keywords
screw
film
cylinder
screw rod
helical member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201710107685.3A
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Chinese (zh)
Inventor
李峰
甄万清
高霜翡
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Zhejiang Kai Yangxin Materials Ltd By Share Ltd
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Zhejiang Kai Yangxin Materials Ltd By Share Ltd
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Priority to CN201710107685.3A priority Critical patent/CN106956416A/en
Publication of CN106956416A publication Critical patent/CN106956416A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50Details of extruders
    • B29C48/505Screws
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/30Extrusion nozzles or dies
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/30Extrusion nozzles or dies
    • B29C48/302Extrusion nozzles or dies being adjustable, i.e. having adjustable exit sections
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/395Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
    • B29C48/40Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
    • B29C48/402Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders the screws having intermeshing parts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/36Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50Details of extruders
    • B29C48/505Screws
    • B29C48/625Screws characterised by the ratio of the threaded length of the screw to its outside diameter [L/D ratio]
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25Component parts, details or accessories; Auxiliary operations
    • B29C48/88Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911Cooling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00Flat articles, e.g. films or sheets

Abstract

The present invention relates to a kind of film-extruding apparatus, including cylinder and screw arbor assembly;Screw arbor assembly is arranged in cylinder, and one end of the cylinder is provided with the hopper for sending into film raw material in cylinder, and the other end of cylinder is provided with discharging opening;The screw arbor assembly includes two parallel screw rods;The helical member of multiple different sizes is mounted on every screw rod;The rotation direction of corresponding helical member is identical on two screw rods and is mutually twisted;The drive device for driving the relatively incorgruous turn of two screw rods is provided with the cylinder, the discharging opening lower end is connected with extrusion die device, and the extrusion die device lower end correspondence is laid with the set composite for cooling down extruding film;The twin (double) screw extruder is by the way of twin-screw rotary squeezing, and the frictional heat that raw material is produced during being extruded is few;Raw material suffered screw rod engagement shear action stable and uniform in machine barrel;Raw material is mixed and plastic quality is relatively good;Improve the conveying capacity of material.

Description

A kind of film-extruding apparatus
Technical field
The invention belongs to film production device technical field, and in particular to a kind of film-extruding apparatus.
Background technology
The film being made of polyvinyl chloride, polyethylene, polypropylene, polystyrene and other resins, for packing, and As coating layer.The fields such as agricultural, food, medicine, chemical industry are had been widely used at present, wherein due to greenhouse gardening industry Development, plastic sheeting is more and more extensive in application agriculturally, and the demand to plastic sheeting is also increasing.
In the production of existing plastic film extruder, material is put into after the machine barrel of extruder, the rotation through screw rod, Extruding and stirring, material fusion plastification under certain temperature action, and under screw rod promotion, lead to after screen pack, flow distribution plate The gap extrusion molding of head annular die is crossed, cooling and shaping finished product is eventually passed.
In film manufacture field, extrusion mechanism is essential equipment, and film raw material enters after being melted by heating arrangements The film of molten condition is delivered to subsequent processing by extrusion mechanism, extrusion mechanism, because extrusion mechanism is horizontally disposed, causes feeding During phenomenon under feeding occurs, occur in that the film thickness under feeding that may result in differs, influence film quality.
As Chinese patent is provided:A kind of film extrusion equipment, Application No.:201620436536.2;It include support, Extrusion mechanism, feeding mouth, discharging opening and the motor for driving the extrusion mechanism to act, described extrusion mechanism one end is located at the support On, the extrusion mechanism adjacent to one end of the support be provided with the feeding mouth, the other end be provided with the discharging opening, it is described go out An accumulator is provided with above material mouth front end, the accumulator upper end is open, is filled in the discharging opening inwall provided with an annular-heating Put;The said equipment increases by an accumulator in discharging opening front end, when equipment normal work, and it is former that accumulator can store part in right amount Material, in the case that appearance is under feeding, the raw material in accumulator will flow out to supplement;Discharging opening inwall heater, keeps away Exempt from because radiating causes the problem of liquid film flow is reduced, meanwhile, reduce the internal-external temperature difference of discharging opening film raw material, it is ensured that film Quality stability.
At present, the raw material of plastic film material production suffered screw rod engagement shear action in machine barrel be not it is very stable, Raw material is mixed and plastic quality is all than relatively low;The demand of user can not be met, the normal work of thin film extruding machine is influenceed.
For problem above, therefore, it is necessary to make improvements.
The content of the invention
The technical problem to be solved in the present invention is in view of the shortcomings of the prior art, to propose that one kind is simple in construction, easy to operate, Plastic sheeting raw material suffered screw rod engagement shear action stable and uniform, the mixing of plastic sheeting raw material and plastic quality ratio in machine barrel Preferably, and process time is short, the high film-extruding apparatus of extrusion moulding product yield.
In order to reach object above, the technical solution adopted in the present invention is:A kind of film-extruding apparatus, including cylinder and Screw arbor assembly;Screw arbor assembly is arranged in cylinder, and one end of the cylinder is provided with the hopper for sending into film raw material in cylinder, The other end of cylinder is provided with discharging opening;The screw arbor assembly includes two parallel screw rods;It is mounted on every screw rod multiple The helical member of different size;The rotation direction of corresponding helical member is identical on two screw rods and is mutually twisted;It is provided with the cylinder Drive device for driving the relatively incorgruous turn of two screw rods, the discharging opening lower end is connected with extrusion die device, described Extrusion die device lower end correspondence is laid with the set composite for cooling down extruding film.
As a preferred embodiment of the present invention, the discharge outlet side is sequentially provided with close to the position of two screw rod ends Flow distribution plate and screen pack;The screen pack is stainless steel filter screen and filter opening is circular hole.
As a preferred embodiment of the present invention, the every screw rod can be divided into:Transportation section, compression section and homogenizing zone;Its The corresponding cylinder in middle transportation section is provided with hopper, two spiral shells of the transportation section, compression section and the corresponding inner barrel of homogenizing zone The helical member installed on bar is transport screw, during assembling, and two screw rod phases differ 90 ° of phase angles.
As a preferred embodiment of the present invention, include splined shaft on the screw rod;The helical member includes screw thread member Part and kneading member;The endoporus of the screwing element and kneading member is provided with the spline corresponding with splined shaft upper spline;It is multiple Different forward and reverse screwing elements are arranged on splined shaft in order with multiple Bu Tong forward and reverse kneading members, splined shaft The screwing element arranged and kneading member are fixed in two ends;One end of the screw rod is provided with the spiral shell matched with spline notch Head, the other end of screw rod is fixedly connected by screw-bearing;The external diameter of the screw head is less than the external diameter of the screw rod;Screw head with Discharging opening position is corresponding.
As a preferred embodiment of the present invention, the screwing element and kneading member of corresponding helical member on the transportation section Using steep-lead thread;Lead thread during the screwing element of corresponding helical member and kneading member are used on the compression section;Institute The screwing element and kneading member for stating corresponding helical member on homogenizing zone use small lead thread.
As a preferred embodiment of the present invention, on the transportation section in the haul distance and compression section of corresponding helical member The haul distance ratio of corresponding helical member is 1:0.6;The haul distance and homogenizing zone of corresponding helical member on the compression section The haul distance ratio of upper corresponding helical member is 1:1.
As a preferred embodiment of the present invention, the extrusion die device include head body, die lip, adjusting screw and Manifold;Die lip is provided with two, and two die lips are symmetrically laid in head body lower end, are flexibly connected by adjusting screw;Two Die lip is V-shaped on the outside of head body.
As a preferred embodiment of the present invention, the film mouthful flowed out for film, institute are formed between described two die lips The T-shaped structure of manifold is stated, the upper end of manifold is corresponding with discharging opening position, and the lower end of manifold is corresponding with set composite.
As a preferred embodiment of the present invention, the set composite includes chill roll, pressure rubber roller and support roller;Institute Chill roll, pressure rubber roller and support roller is stated to be rotationally connected with contiguous block;Chill roll and support roller tangency location and film mouthful position Put on same vertical plane.
As a preferred embodiment of the present invention, the draw ratio of the screw rod is:L/D=28~30, [L is effective for screw rod Length (mm), D is screw diameter (mm)];Compression ratio i=1.1~2.0 of the screw rod.
The beneficial effects of the invention are as follows:
1. the screw design rationally, improves production efficiency, load increase;
2. the twin (double) screw extruder is by the way of twin-screw rotary squeezing, the frictional heat that raw material is produced during being extruded It is few;Raw material suffered screw rod engagement shear action stable and uniform in machine barrel;Raw material is mixed and plastic quality is relatively good;Improve material Conveying capacity.
3. by setting transportation section A, compression section B and homogenizing zone C so that raw material residence time in machine barrel is shorter, extrusion Moulded products yield is high;The raw material quality that extrusion plasticizing, mixing are plastified on the twin screw extruder is more stable;Twin-screw is engaged Defective material can be cleared up automatically in rotary work, machine barrel.
4. the draw ratio of screw rod is 28~30, plasticizing capacity is stronger, can properly increase screw speed, and extrusion capacity can be improved 1.1-1.3 times;Compression ratio i is 1.1~2.0, it is possible to produced by reaching that preferable plasticizing effect, material are sheared and extruded Heat reduce, it is to avoid thermo-responsive material is produced overheat.
It is that can shorten die lip to chill roll and pressure roller to fold contact line using the purpose of V-type 5. head die lip profile is V-shaped Distance, improve plastic sheeting tension force and firmness.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention;
Fig. 2 is the A-A sectional views of the present invention;
Fig. 3 is the screw-rod structure schematic diagram of the present invention;
Fig. 4 is the structural representation of screwing element of the present invention.
Fig. 5 is the structural representation of kneading member of the present invention.
Reference in figure:Cylinder 1, film 2, screw rod 3, discharging opening 4, drive device 5, screw rod 6, splined shaft 6-1, screw thread Element 6-2, kneading member 6-3, spline 6-4, screw head 6-5, head body 66-1, die lip 66-2, adjusting screw 66-3, discrimination Pipe 66-4, film mouthful 66-5, film 7, flow distribution plate 8, screen pack 9, chill roll 10, pressure rubber roller 11, support roller 12, helical member 13。
Embodiment
The embodiment of the present invention is elaborated below in conjunction with the accompanying drawings.
Embodiment:As Figure 1-5, a kind of film-extruding apparatus, including cylinder 1 and screw arbor assembly;Screw arbor assembly is set In cylinder 1, one end of the cylinder 1 is provided with the hopper 2 for sending into film raw material in cylinder 1, and the other end of cylinder 1 is provided with Discharging opening 4;The screw arbor assembly includes two parallel screw rods 3;The spiral of multiple different sizes is mounted on every screw rod 3 Part 13;The rotation direction of corresponding helical member 13 is identical on two screw rods 3 and is mutually twisted;It is provided with the cylinder 1 for driving The drive device 5 of the relatively incorgruous turn of two screw rods 3, the lower end of discharging opening 4 is connected with extrusion die device 6, the extrusion The lower end of die head device 6 correspondence is laid with the set composite for cooling down extruding film;Drive device 5 includes screw-bearing, electronic Machine and the gear reduction box being connected by conveyer belt with the motor, the gear reduction box are driven by the rotation of screw-bearing Screw rod 3 rotates, the gear reduction box, is fixed in frame and is connected by nut.
Side is sequentially provided with flow distribution plate 8 and screen pack 9 close to the position of two ends of screw rod 3 at discharging opening 4;The screen pack 9 be stainless steel filter screen and filter opening is circular hole, sets screen pack 9, the impurity of the film material after stirring can be screened Filtering, improves material quality;Machine tube inner wall sets flow distribution plate 8, increases transfer efficiency, is easy to compression and the homogenizing of melt, improves The compression of melt granules and the production capacity of homogenizing and efficiency;Composition operation can be completed while extrusion.
Every screw rod 3 can be divided into:Transportation section A, compression section B and homogenizing zone C;The corresponding cylinders 1 of wherein transportation section A are provided with The helical member 13 installed on two screw rods 3 inside hopper 2, the transportation section A, compression section B and the corresponding cylinders 1 of homogenizing zone C Transport screw is, during assembling, two phases of screw rod 3 differ 90 ° of phase angles;Transportation section A plays Solid Conveying and Melting, plastic film In the solid-state not plastified in the A of transportation section, the particle of compacting, and rubbed generation heat are gradually become by loose particle;Pressure Contracting section B plays plastic film melting, and plastic film is gradually changed in the B of compression section from solid-state to viscous state, in this section Stirring, shearing, rubbing action are all more complicated;Homogenizing zone C main function is that the fused films plastics for sending compression section increase Big pressure, it is further homogenous plasticized, and make its level pressure, quantitatively extrude from extrusion die device 6, it is corresponding on the A of transportation section The helical member 13 installed on screw rod 3 is acute angle with the formation of screw rod 3 slanted angle α, slanted angle α, allows helical member 13 to produce and leans forward Active force, the material that material is fallen from loading hopper 2 is quickly extruded forward, feed back phenomenon will not be produced.
Include splined shaft 6-1 on screw rod 3;The helical member 13 includes screwing element 6-2 and kneading member 6-3;The spiral shell Texel part 6-2 and kneading member 6-3 endoporus are provided with the spline 6-4 corresponding with splined shaft 6-1 upper splines;Multiple differences Forward and reverse screwing element 6-2 is arranged on splined shaft 6-1 in order with multiple Bu Tong forward and reverse kneading member 6-3, flower The screwing element 6-2 arranged and kneading member 6-3 are fixed in key axle 6-1 two ends;One end of the screw rod 3 is provided with and spline The screw head 6-5 that groove 6-4 notches match, the other end of screw rod 3 is fixedly connected by screw-bearing;Screw head 6-5's is outer Footpath is less than the external diameter of the screw rod 6;Screw head 6-5 is corresponding with the position of discharging opening 4.
The screwing element 6-2 and kneading member 6-3 of corresponding helical member 13 use steep-lead thread on the A of transportation section;It is described Lead thread during the screwing element 6-2 and kneading member 6-3 of corresponding helical member 13 are used on the B of compression section;On the homogenizing zone C The screwing element 6-2 and kneading member 6-3 of corresponding helical member 13 use small lead thread;The angle of above-mentioned three sections of helical members 13 Difference, produced shearing force is different, contributes to fine difference between adapting to material particles to be melted and extruded, improves homogenizing effect Really.
In operation, the use for screwing element 6-2 is divided into forward and reverse screw thread, and forward screw thread is mainly used in The conveying of material, reverse thread primarily serves supercharging and the back-mixing effect of material, and screwing element 6-2 geometric parameter is mainly led Journey and spiral groove depth, can be divided into large, medium and small helical pitch;Spiral groove depth have it is deep, in, shallow point.
Large pitch, refers to pitch for 1.5D~2D3, small helical pitch, and it is 0.4D or so to refer to pitch;Its laws of use:With helical pitch Increase, the extrusion capacity of screw rod 3 increase, residence time of material is reduced, mixed effect reduction;From the occasion of steep-lead thread, with defeated Occasion based on sending, beneficial to raising yield;Thermosensitive polymer, shortens the residence time, reduces degraded;Selected at exhaust(Also have From shallow slot), increase surface area, beneficial to exhaust, volatilization etc..
The lead thread occasion from, the occasion based on mixing has the different diminishing combinations of active section, is used for Conveying and supercharging.
The occasion with small lead thread is chosen, to be usually to be gradually reduced in combination, for transportation section and homogenizing metering section, Supercharging is played, melting is improved;Improve mixing materialization degree and extrusion is stable.
It is the key element of twin (double) screw extruder for kneading member 6-3, its main function is to provide Strong shear power, material High degree of dispersion is realized by the shear action of kneading member 6-3 shearing force, when material is by kneading disc, its interface and shearing side To difference, because shear action makes material constantly update interface, make material refinement and uniform.
Direction, point forward and reverse.Reversely, the conveying to material has inhibition, plays the extension time, improves filling and increases Big pressure, greatly improves the effect of melting effect.
Angle, point for typically having " 30 °, 45 °, 60 °, 90 ° ", it is acted on and effect:When positive, increase alternate angle, will drop Low conveying capacity, extends the residence time, improves melting effect, but easier leakage current.For distributed rendering and dispersion mixing, point Cloth mixing is big and more efficient with angle, and in 45 ° of angle preferably, next to that 30 °, worst be 60 ° to dispersion mixing;Reversely When, increase angle, effective limitation of polymer, but easier leakage current will be reduced.
Spiral shell rib width typically has 7mm, 11mm, 11.2mm, 14mm, 19mm etc., and this is to weigh shearing size and mixing greatly One of small most important parameters, the bigger mixing of the bigger shearing of width is smaller;The smaller mixing of the smaller shearing of width is bigger.For For distributed rendering and dispersion mixing, distributed rendering, with width increase, validity is reduced, and dispersion mixing is effective with width increasing Property increase;Width is smaller, and material axial direction the ratio between effective discharge and radial direction effective discharge increase therewith.
Head number, typically divide single head, double end, three.Its action effect:When positive, head number is fewer, and extrusion conveying capacity is got over Greatly, moment of torsion is bigger, and mixed characteristic is also more excellent, but shear action is fewer.
When reversely, head number is fewer, and extrusion conveying capacity is smaller, and mixed characteristic is more excellent;Two head threads, which can be led, carrys out extrusion molding, is heated Uniform and be again short, self-cleaning property is good(Conventional);Three-start screw, can flexibly select material in the pressure and temperature point at machine angle Cloth, plus it is fine stable, discharge surface more new effects are good, but yield poorly.
The haul distance of the haul distance of corresponding helical member 13 helical member 13 corresponding with the B of compression section on the A of transportation section Ratio is 1:0.6;The haul distance of corresponding helical member 13 helical member 13 corresponding with homogenizing zone C on the compression section B Haul distance ratio is 1:1.
As one of embodiment, spiro rod length L is 4400mm, wherein transportation section A length 2000mm, compression section B length 1200mm, homogenizing zone C length 1200mm;The haul distance of corresponding helical member 13 spiral shell corresponding with the B of compression section on the A of transportation section The haul distance ratio of rotating part 13 is 1:0.6;On the compression section B in the haul distance of corresponding helical member 13 and homogenizing zone C The haul distance ratio of corresponding helical member 13 is 1:1, it can preferably adapt to the charging needs of screw rod 3;Compression section B whole process is set End to end screwing element 6-2 and kneading member 6-3 is equipped with, screw rod 3 can be made to reach preferable homo-effect.
In the present invention, extruder diameter is generally 45~200mm, be with Φ 90mm at present it is most universal, diameter 200mm's It is mainly used in the coating of more than 3m broad-width materials;The draw ratio of screw rod 3 is larger, and [L is the effective length of screw rod for L/D=28~30 (mm), D is screw diameter (mm)], it is desirable to there is enough intensity, screw compression is than i=3.5~4, compression ratio computing formula:i= (h1*(D-h1))/(h3*(D-h3));Screw-rod structure type for mutation screw rod or gradual change metering type can metering section it is a length of complete Long 1/3, can guarantee that film raw material discharging is uniform, pressure stability.
The screw diameter for being usually used in the compound 90mm extruders of extrusion is 90mm, draw ratio L/D=28~30, the pressure of screw rod 3 Contracting is than i=1.1~2.0;Spiral groove depth h chargings=14.5mm, h dischargings=3.5mm, screw speed n=12~120r/min, maximum is squeezed Output about 200kg/h;In order to protect coating silica gel roller and be easy to change clearly screw rod and head without damaging film-extruding apparatus dress Put, extruder should on the guide rail, be easy to forward, be moved rearwards by.In order to adjust the distance between die lip applicator roll, on support also There must be the structure of oscilaltion.
Extrusion die device 6 includes head body 66-1, die lip 66-2, adjusting screw 66-3 and manifold 66-4;Die lip 66- 2 are provided with two, and two die lip 66-2 are symmetrically laid in head body 66-1 lower ends, are flexibly connected by adjusting screw 66-3; Two die lip 66-2 are V-shaped on the outside of head body 66-1;The film mouthful flowed out for film is formed between two die lip 66-2 66-5, the T-shaped structures of manifold 66-4, manifold 66-4 upper end is corresponding with the position of discharging opening 4, manifold 66-4 lower end with Set composite is corresponding.
Extrusion die device 6 often uses straight manifold 66-4 T-shaped head, and head die lip 66-2 profiles are V-shaped, using V-type Purpose be that can shorten the distance that die lip 66-2 folds contact line to chill roll 10 and support roller 12, this distance generally 50~ Between 150mm.
Head die lip 66-2 width is the width of the material of film 7, mainly by the diameter of extrusion die device 6 depending on, The diameter of extrusion die device 6 is bigger, and extrusion capacity is bigger, and head die lip 66-2 width can also increase, general width be 600~ 1500mm, it is most wide for more than 2600mm;Manifold 66-4 diameters are generally 30 ~ 45mm, and die lip 66-2 gaps are 0.3~1.0mm, The transverse gage of coated film 7 is more uniform;In order to adapt to the different in width for being combined, being coated with, die orifice 66-5 should be designed as width-adjustable formula Structure, two two die lip 66-2 are flexibly connected by adjusting screw 66-3;The width of film 7 can use the method for inserting metal bar To adjust;To adapt to the requirement of different-thickness, die lip gap also should be adjustable.
Set composite is, for 7 films of film of extrusion are combined with each other with base material, and to be cooled down;Set composite bag Include chill roll 10, pressure rubber roller 11 and support roller 12;The chill roll 10, pressure rubber roller 11 and support roller 12 rotate connection In on contiguous block;Chill roll 10 is with the tangency location of support roller 12 and film mouthful 66-5 positions on same vertical plane.
Chill roll 10 is using the steel rider of chrome-faced, and its effect is to take away the heat of fused films, cools down and solidifies painting Cover film and be molded it;Therefore, the surface of chill roll 10 must be smooth, the pressure of composite press roller and cooling water can be born, with tree Fat fissility is good(It is not stick to film), roll surface temperature is evenly distributed, good cooling results.
In order to improve cooling effect and make the surface temperature of roller uniform, chill roll 10 is mostly using two-layer spiral cooling Roller, the part that internal layer discharges water is not contacted with outer layer.Chill roll is relatively large in diameter, generally 450~600mm, is 1000mm to the maximum, can Cooling effectiveness is improved, the length of chill roll 10 is slightly more longer than the head width of extrusion die device 6.
Cooling water temperature typically requires to be 10~20 DEG C(As effect if the cooling water less than 10 DEG C is more preferable);Water temperature over-high meeting Reduce composite membrane transparency and produce roll banding phenomenon.The flow velocity of water is 0.3~0.5m/s, and flow velocity is too low to be easily deposited on incrustation scale Roller inwall and reduce cooling effect, be typically both needed to be equipped with Special water pump supply water.
There are two kinds of minute surface and ground surface in the surface of chill roll 10;The film clarity being combined with mirror roller is high, glossy, but Because reducing mobility of the molten plastic on roller, longitudinal thickness fluctuation is easily produced, while film easily produces roll banding phenomenon, Influence its fissility.The film clarity and gloss being combined with ground surface roller are slightly worse, but film longitudinal thickness is uniform, and not easy to stick Roller.
The effect of pressure rubber roller 11 is that base material and molten plastic film are pressed into chill roll 10 with certain pressure, makes base material With fused films compress, cling, and cool down, curing molding.Because the temperature of the molten film from head extrusion is up to 300 DEG C More than, it is contacted with pressure rubber roller 11 first, therefore, the material of pressure rubber roller 11 should have heat-resist, wearability it is good, With the performance such as the fissility of resin is good, transversely deforming is small, tear resistance is good, so ordinary rubber pressure roll 11 is to use steel rider bread Cover the thick rubber of 20 ~ 25mm and be made.
The rubber of rubber-coated pressure roll 11 is usually silicon rubber, and its heat-resist, wearability is good, is difficult glutinous with polyethylene Connect, it is easily peelable, it is nontoxic, it is easy to operate.The relative position of pressure rubber roller 11 and chill roll 11 and head die lip 66-2 is for squeezing Multiple fastness has very big relation.In general, resin temperature when being contacted with base material is higher, then the peel strength between composite membrane Also it is higher;Because the molten film from head extrusion is contacted with pressure rubber roller 11 first, the situation of higher temperature is being kept Under chill roll 10 pressed to together with base material be combined, the composite membrane being so made is combined fastness just very well, but can not be from Chill roll is too remote, if too far film can extend.
Support roller 12 is metal pressure roller.It has the double action for pressurizeing rubber roller 11 with outer cooling.Support roller 12 It is that, by pressurized with compressed air, the pressure limit of general compression pump selects 0~0.8MPa to apply pressure to pressure roller.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention. A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention;Therefore, it is of the invention The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one The most wide scope caused.
Although more having used reference in figure herein:Cylinder 1, film 2, screw rod 3, discharging opening 4, drive device 5, Screw rod 6, splined shaft 6-1, screwing element 6-2, kneading member 6-3, spline 6-4, screw head 6-5, head body 66-1, die lip 66-2, adjusting screw 66-3, manifold 66-4, film mouthful 66-5, film 7, flow distribution plate 8, screen pack 9, chill roll 10, pressure rubber roller 11, support roller 12, the grade term of helical member 13, but it is not precluded from the possibility using other terms.It is only using these terms In order to more easily describe and explain the essence of the present invention;Being construed as any additional limitation is all and the present invention What spirit was disagreed.

Claims (10)

1. a kind of film-extruding apparatus, it is characterised in that:Including cylinder(1)And screw arbor assembly;Screw arbor assembly is arranged on cylinder(1) It is interior, the cylinder(1)One end be provided with film raw material sent into cylinder(1)Interior hopper(2), cylinder(1)The other end set There is discharging opening(4);The screw arbor assembly includes two parallel screw rods(3);Every screw rod(3)On be mounted on multiple different rule The helical member of lattice(13);Two screw rods(3)Upper corresponding helical member(13)Rotation direction it is identical and be mutually twisted;The cylinder(1) On be provided with for drive two screw rods(3)The drive device of relatively incorgruous turn(5), the discharging opening(4)Lower end is connected with Extrusion die device(6), the extrusion die device(6)Lower end correspondence is laid with the set composite for cooling down extruding film.
2. a kind of film-extruding apparatus according to claim 1, it is characterised in that:The discharging opening(4)Locate side close to two Root screw rod(3)The position of end is sequentially provided with flow distribution plate(8)And screen pack(9);The screen pack(9)For stainless steel filter screen and Filter opening is circular hole.
3. a kind of film-extruding apparatus according to claim 2, it is characterised in that:The every screw rod(3)It can be divided into:It is defeated Send section(A), compression section(B)And homogenizing zone(C);Wherein transportation section(A)Corresponding cylinder(1)It is provided with hopper(2), the conveying Section(A), compression section(B)And homogenizing zone(C)Corresponding cylinder(1)Two internal screw rods(3)The helical member of upper installation(13) For transport screw, during assembling, two screw rods(3)Phase differs 90 ° of phase angles.
4. a kind of film-extruding apparatus according to claim 1 or 2 or 3, it is characterised in that:The screw rod(3)On include There is splined shaft(6-1);The helical member(13)Including screwing element(6-2)And kneading member(6-3);The screwing element(6-2) And kneading member(6-3)Endoporus be provided with and splined shaft(6-1)The corresponding spline of upper spline(6-4);Multiple differences are positive and negative To screwing element(6-2)With multiple Bu Tong forward and reverse kneading members(6-3)Splined shaft is arranged in order(6-1)On, flower Key axle(6-1)Two ends by the screwing element arranged(6-2)And kneading member(6-3)It is fixed;The screw rod(3)One end set Have and spline(6-4)The screw head that notch matches(6-5), screw rod(3)The other end be fixedly connected by screw-bearing;Should Screw head(6-5)External diameter be less than the screw rod(6)External diameter;Screw head(6-5)With discharging opening(4)Position is corresponding.
5. a kind of film-extruding apparatus according to claim 3, it is characterised in that:The transportation section(A)Upper corresponding spiral shell Rotating part(13)Screwing element(6-2)And kneading member(6-3)Using steep-lead thread;The compression section(B)Upper corresponding spiral shell Rotating part(13)Screwing element(6-2)And kneading member(6-3)The lead thread in;The homogenizing zone(C)Upper corresponding spiral shell Rotating part(13)Screwing element(6-2)And kneading member(6-3)Using small lead thread.
6. a kind of film-extruding apparatus according to claim 5, it is characterised in that:The transportation section(A)Upper corresponding spiral shell Rotating part(13)Haul distance and compression section(B)Upper corresponding helical member(13)Haul distance ratio be 1:0.6;The compression Section(B)Upper corresponding helical member(13)Haul distance and homogenizing zone(C)Upper corresponding helical member(13)Haul distance ratio For 1:1.
7. a kind of film-extruding apparatus according to claim 1, it is characterised in that:The extrusion die device(6)Including Head body(66-1), die lip(66-2), adjusting screw(66-3)And manifold(66-4);Die lip(66-2)It is provided with two, two Individual die lip(66-2)Symmetrically it is laid in head body(66-1)Lower end, passes through adjusting screw(66-3)It is flexibly connected;Two die lips (66-2)In head body(66-1)Outside is V-shaped.
8. a kind of film-extruding apparatus according to claim 6, it is characterised in that:Described two die lips(66-2)Between shape Into there is the opening that goes out for Film Flow(66-5), the manifold(66-4)T-shaped structure, manifold(66-4)Upper end and discharging opening (4)Position is corresponding, manifold(66-4)Lower end it is corresponding with set composite.
9. a kind of film-extruding apparatus according to claim 7, it is characterised in that:The set composite includes chill roll (10), pressure rubber roller(11)And support roller(12);The chill roll(10), pressure rubber roller(11)And support roller(12)Rotate It is connected on contiguous block;Chill roll(10)With support roller(12)Tangency location and opening(66-5)Position is on same vertical plane.
10. a kind of film-extruding apparatus according to claim 4, it is characterised in that:The screw rod(3)Draw ratio be: L/D=28~30, the screw rod(3)Compression ratio i=1.1~2.0.
CN201710107685.3A 2017-02-27 2017-02-27 A kind of film-extruding apparatus Pending CN106956416A (en)

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CN109228244A (en) * 2018-10-30 2019-01-18 台州学院 A kind of film-extruding apparatus
CN110142499A (en) * 2019-04-23 2019-08-20 南昌航空大学 One kind rubs extrusion method and device from feed paddle head, from feed paddle
CN112497701A (en) * 2020-11-11 2021-03-16 浙江工业职业技术学院 Pressure stabilizing system of plastic extruder
CN113942209A (en) * 2021-10-11 2022-01-18 江阴中达软塑新材料股份有限公司 Preparation method and preparation equipment of high-stiffness low-static film special for cigarette packets

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