CN201342785Y

CN201342785Y - PET extruding system

Info

Publication number: CN201342785Y
Application number: CNU2009200677149U
Authority: CN
Inventors: 杜琪钦
Original assignee: Entex International Trading (shanghai) Co ltd
Current assignee: Entex International Trading (shanghai) Co ltd
Priority date: 2009-02-13
Filing date: 2009-02-13
Publication date: 2009-11-11
Anticipated expiration: 2019-02-13

Abstract

The utility model relates to a PET (polyethylene glycol terephthalate) extruding system, in particular to a PET extruding system capable of performing kneading and drying, wherein, the PET extruding system comprises a feeding device and a screw extruder. The PET extruding system is characterized in that the screw extruder comprises a single screw extruder 2 used for feeding, a planet screw extruder 3 used for kneading and a single screw extruder 4 used for discharging; and the extruders are realized through a crossing rod or pipe 30, that is, the crossing rod or pipe 30 is taken as a common center shaft of the single screw extruder 2, the planet screw extruder 3 and the single screw extruder 4. The PET extruding system solves the problem that a PET extruding machine is difficult to deaerate, and makes up the disadvantage in the prior art that regenerative PET materials are hard to process.

Description

A kind of PET extrusion system

Technical field

The utility model relates to a kind of PET extrusion system, particularly relates to a kind of PET extrusion system that carries out mixing drying.

Background technology

The global meaning of PET (PETG) has obtained the confirmation of many pieces of papers.The paper of Schwarz for example, " extruding reprocessing to PET by reactivity " wherein also listed other publication data.This article has pointed out that it is to packing, the especially meaning of beverage packaging.Produced demand accordingly with this meaning to PET.To consider corresponding waste material amount in addition.In waste material industry, PET has favorable situation.Most suitable to a great extent this industry of PET.The regeneration of PET has several different methods.A method is the regeneration of raw material.Another kind method is the regeneration of material.The regeneration of material comprises pulverizing, purification and oven dry and the granulation again subsequently of waste material.Purification ratio is difficulty.Short ofly reach 100% purification, the possibility that waste material is reused will be restricted.No matter be that new material or waste material all face a problem, promptly PET is a condensation polymer.Monomer combines by dehydration, thereby forms condensation polymer.This process is reversible.PET especially at high temperature, can be decomposed into its constituent by the effect of water.

When leaving in the surrounding air, PET can absorb the moisture of maximum 0.5% (weight).This moisture can influence the quality of product.Therefore tackling PET usually before processing dries.But can not dry in advance yet, PET is put into a double screw extruder, moisture is discharged from PET solution with the form of the degassing.This situation also can be established two degas zones.But this known method is very complicated, and extremely difficult reaching can commercial PET quality.Therefore this method also can't be carried out at present.EP-A-0336520 has described the preparation of PET when using double screw extruder.Wherein, the PET of Rong Huaing does not pass through low pressure feed, thereby can dry and discharge the steam that contains to PET.Double screw extruder has two to be arranged in parallel in shell and the screw rod of tight engagement.Double screw extruder has quite fixing deformation pattern, fixing structure, fixing production capacity performance also can form high pressure in the shortest time.In order to outgas, stipulated long extruder length.This is to be that the specification example of 25D or 42D draws according to length.This is a kind of length dimension, is equivalent to 25 times or 42 times of screw diameter D.WO-A-0032377 has described an extruder that has many twin-screws, and these twin screw arrangement are on circumference.The principle of twin-screw can not change because of using a plurality of twin-screws.Double screw extruder degassing difficulty causes quality problems easily.

Summary of the invention

The purpose of this utility model provides a kind of PET extrusion system, a kind of PET extrusion system that carries out mixing drying particularly is provided, a kind of PET extrusion system of the present utility model outgases when mixing to raw material under being lower than the PET glass transition temperature, can be compared to most low 10 degrees centigrade at least of PET glass transition temperatures, than PET glass transition temperature low at least 15 degrees centigrade then better.The utility model solved the problem of PET extruder degassing difficulty, remedied the deficiency that prior art is difficult to handle the regenerative PET material.

A kind of PET extrusion system of the present utility model, comprise feed arrangement and screw extruder, it is characterized in that: described screw extruder is made up of the single screw extrusion machine 2 that is used for charging, the single screw extrusion machine 4 that is used for mixing Planetary Screw Extruder 3 and is used for discharging, extruder is by a bar that crosses or manage 30 and realize, the bar that promptly crosses or manage 30 as the common central shaft of single screw extrusion machine 2, Planetary Screw Extruder 3 and single screw extrusion machine 4.

As optimized technical scheme:

Wherein, aforesaid a kind of PET extrusion system, described Planetary Screw Extruder 3 adopts hedgehog formula engagement screws axle or complex screw axle, and/or the planetary-screw part of barbed hedgehog formula engagement.

Aforesaid a kind of PET extrusion system, described complex screw axle are the combinations of hedgehog formula engagement screws axle and conventional planetary-screw axle.

Aforesaid a kind of PET extrusion system, the formation of described hedgehog formula engagement are owing to have the screw rod of left-handed or dextrorotation engagement or have the whole or local nut of being furnished with the different directions rotation of planetary-screw part left-handed or the dextrorotation engagement, intersect with engagement.

Aforesaid a kind of PET extrusion system, the maximum gradient with engagement of gradient that described screw rod or planetary-screw part are used for nut differed 50% o'clock, and/or the backlash that causes when nut aligns mutually with two corresponding planetary-screw parts or during arrangement interlaced with each other, use the planetary-screw part, the distance that staggers equates with the part of backlash or is its multiple.

Aforesaid a kind of PET extrusion system, described Planetary Screw Extruder 3 can also adopt the planetary-screw axle of normal engaged to combine with the planetary-screw part of hedgehog formula engagement.

Aforesaid a kind of PET extrusion system, described feed arrangement comprise two

containers

8 and 9 and guiding valves placed in the middle 10, have a batching conduit to feed screw extruder inlet 2 from container 8; Feed arrangement forms vacuum by pump 11 in container 9, container 8 by the vacuum of pump 12 manufacturings, inserts condenser 13 in the conduit of inlet between 2 on the conduit before the pump 12.

Aforesaid a kind of PET extrusion system, the described bar that crosses or manage 30 and heat by heating and cooling circuit 14, single screw extrusion machine 2 is provided with heating cooling circuit 15 and heats, Planetary Screw Extruder 3 is cooled off by heating cooling circuit 16, single screw extrusion machine 4 is by 17 heating of heating cooling circuit, and each screw extruder all has exhaust outlet.

Aforesaid a kind of PET extrusion system, described system also is included in single screw extrusion machine 4 backs that are used for discharging and inserts solution pump 5, solution pump 5 connects wide seam nozzle 6, at wide seam nozzle 6 jet holes calendering running roller 7 is installed, and calendering running roller 7 is by 18 coolings of cooling circuit.

Aforesaid a kind of PET extrusion system, described feed arrangement can also be to comprise that charging aperture 29 leads to a funnel shaped material container 31 that adds, add the top that material container container 31 is arranged on a valve container 32, valve container 32 is located at the top of another valve container, there is a discharging screw rod 36 to lead to a delivery pipe 37 from valve container 33, a valve or guiding valve 34 have been established between two

containers

31 and 32, a valve or guiding valve 35 have been established between the

container

32 and 33, each container all is provided with

air intake duct

42,41,46 and 45 and

pump

43 and 44, respectively to

container

31,32,33 and delivery pipe 37 bleed,

air intake duct

42,41, established guiding valve 38 in 46 and 45,39,40 and 47, container 33 is provided with limit switch 48, and container 32 is provided with upper limit switch 49.

A kind of PET extrusion system of the present utility model is a kind of PET extrusion system that carries out mixing drying, and raw material is preferably graininess.Raw material also can be sheet, bits, plate, silk and bulk.This comprises any other form of raw material, and multi-form mixing.Otherwise when regeneration PET add additive be used for new PET or, multi-form mixing may not only can be used on new (new production) PET, on the PET that also can be used for regenerating.PET need not fusing can carry out carrying out mass exchange by mixing at particle surface according to of the present invention mixing, and Biao Mian moisture can evaporate like this, improves evaporation by particle is heated.Heat when mixing at every turn and all can improve evaporation.Temperature can reach 50 degrees centigrade at least like this.Mixingly should adopt Planetary Screw Extruder or be the parts of Planetary Screw Extruder at least.When extruder is made up of a plurality of parts of different structure, promptly be called the Planetary Screw Extruder parts.Planetary Screw Extruder has the shell of engagement in the center bolt, and different planet small screw between shell internal tooth and center bolt.The planet small screw not only with center bolt and also with the engagement of the extruder shell of interior engagement.The planet small screw is around the center bolt rotation.Carry out the Planetary Screw Extruder parts to be arranged to according to of the present invention mixing in order to need not fusing, the raw material distortion is limited to does not have the mixing of fusing.For mixing setting, Planetary Screw Extruder can be carried out following change: a) gap between the Huo Dong planetary-screw part, the b) quantity of planet small screw, c) engagement of planetary-screw part.

For a), the degree of particle deformation should be determined as between the tooth that reaches the planetary-screw part time in the gap between the movable planetary-screw part.The gap is more little, and then distortion is big more.The gap is big more, and then distortion is more little.

For b) Planetary Screw Extruder or its parts are except extreme deformability, between the planet small screw around the center bolt rotation cavity is arranged with the special character that the extruder of other structure is compared with the extruder parts.Particle can flow into this cavity.This cavity is subjected to the influence of the number change of planet small screw.Planet small screw quantity is few more, and then cavity is big more.

For c) engagement different forms can be arranged.Hedgehog formula engagement arranged according to the present invention.Hedgehog formula engagement design in order better to disperse, rather than assisting during as the degassing.The engagement of hedgehog formula preferably is present in conventional engagement.The routine engagement characteristics on the one hand of planet small screw are the outward appearances of the staggered interlock of tooth of gear-box gear.The tooth of gear does not form straight line but spirality on the other hand, just as threaded line is curled up along circumference.The raw material of planet small screw also cuts threaded line by this way, such as cutting or milling.Screw thread divides left-handed and right-handed thread.Also has multi start thread.

Extrude arbor same difference is also arranged.Such as, when left-handed nut is the same with threaded line when screwing in the dextrorotation engagement, then form the engagement of hedgehog formula.The threaded line of planet small screw is blocked by nut.Nut can be compared the gradient that identical or different (less or bigger) arranged with the engagement of axle.Preferably the gradient of nut and the gradient of engagement differ 50% at most.The engagement of hedgehog formula can be limited to independent planetary-screw part.The engagement of hedgehog formula also can be used for a plurality of or all planetary-screw parts.Hedgehog formula engagement can be fully or the engagement of local formation planetary-screw part.When on the planetary-screw part, carrying out local hedgehog formula engagement, the part of conventional engagement in the planetary rollers wheel component can be come the end (planetary-screw part discharging side) on the extruder direction of transfer, so that form a discharge pressure there, guarantee the conveying of particle in the influential extruder of other fusing zone to particle.Otherwise also can select with the planetary-screw axle of normal engaged replace hedgehog formula engagement planetary-screw axle or.Otherwise also can select independent normal engaged planetary-screw axle is arranged between the planetary-screw axle of hedgehog formula engagement or.As long as use the engagement of hedgehog formula in a plurality of corresponding planetary-screw parts, the engagement of hedgehog formula can be set as the gap of the engagement in the planetary-screw part and align with the gap in the planetary-screw part accordingly or stagger with these gaps.The distance that staggers can equate or be the multiple of the backlash of two teeth with the backlash of two teeth, and multiple can be less than 2.The gap of tooth has formed the opening that particle can flow into.Aforementioned b) cavity size described in and c) described in hedgehog formula engagement reduced the pressure that the planetary-screw part produces, thereby particle can be stayed during the degassing of necessity in extruder or the extruder parts.The diameter of Planetary Screw Extruder shell is in 100 millimeters the time, and the planetary rollers wheel component preferably has the longest 1200 millimeters length, the longest 1000 millimeters then better.Other engagement diameter of Planetary Screw Extruder shell then correspondingly has longer or shorter extreme length.

Extruder or extruder parts give off energy in a big way when mixing, and this energy then shows as heat to particle.As long as particle has reached higher temperature in Planetary Screw Extruder or Planetary Screw Extruder parts, then have necessity and discharge by the heat that cooling will accumulate.As long as particle does not also reach enough temperature in Planetary Screw Extruder or place, extruder component entry, then do not carry out above-mentioned cooling.In case of necessity even will import heat.For cooling and/or heating, temperature control equipment common on the Planetary Screw Extruder is enough.Usually, shell divides two-layer, and the temperature control agent is passed in the middle of it.Usually, center bolt also has passage, and the temperature control agent can be passed too.General temperature control agent is water or oil through heating or cooling.In order to allow particle provide favourable as far as possible output temperature for degasification process, particle will carry out preheating in extruder inlet and/or preposition heater before entering according to evaporation process of the present invention and degasification process.Be preferably in the extruder that has the inlet screw rod (inlet) that has heated before Planetary Screw Extruder parts and preposition, the PET preheating and carry out according to the evaporation of the present invention and the degassing, the temperature control in the Planetary Screw Extruder parts will be limited to cooling like this.The inlet screw rod is preferably single screw rod.Inlet screw rod top can be established a barrel usually, also can establish a feed worm charging.Preferably charging is heated simultaneously, so that prolong preheating section.The steam that the degassing produces in the Planetary Screw Extruder parts can be discharged therefrom.Therefore can on the Planetary Screw Extruder parts, use common degasser.But preferably by the exhaust of inlet screw rod.Be provided with a vacuum (aspirator) for this reason in the inlet region, and guarantee by the charging of some particles, steam can be along the discharging of inlet screw rod.Here the screw rod that enters the mouth should add end liner.Charging should make the particle of putting into loose as far as possible at the passage of inlet screw rod.The cross section of best whole inlet screw rod has only part to be filled.Also can select to use the screw channel of the cross section structure of corresponding size.The size of screw channel is on the one hand by a spot of test, and is definite by calculating on the other hand.What calculating was played a decisive role is the material performance and the material of appointment.

Whether degree mixing and vacuum suitably can be controlled by observing the solution that comes out in the extruder easily.When quality reduces, bubble or dregs can occur in the solution that comes out, and undyed PET should be transparent after the correct degassing.Bubble and dregs in the ordinary course of things can be by strengthening mixing and/or strengthening the vacuum that is used to outgas and eliminate.Vacuum as possibility, also has the charging of sealing to form by the inlet of sealing.Sealing can realize by the one or more valves that use particle to pass.Each valve can be made up of a container and two sealing devices that are installed in container flow direction front and back.All the time should close a sealing device at least during a valve working.Should distinguish the formation of vacuum in the charging, container of container and the emptying of container during valve working.Answer the closing containers outlet during container loading.When bleeding the manufacturing vacuum, the outlet and the inlet of best closing containers.During emptying receptacles, the inlet of container keeps closing, and outlet of container is opened.When having only such valve, can produce interrupted charging, when container loading because the charging of screw rod must be interrupted.Two such valves are arranged, then can realize continuous charging.Valve can be arranged in parallel, and a valve can switch to another valve during emptying like this.Valve also can serial arrangement.During serial arrangement, particle passes the container in first valve earlier, passes second container in the valve then.On the landline of particle, just there is one like this from the nearest container of extruder, also has a distance farther, on throughput direction, be positioned at the container of first container front.In this design, before the beginning emptying, the container feed supplement from the container of first valve always in second valve.When second container was subjected to the pressure identical with first container, first container was opened and is carried out feed supplement.The container of two valves sends the controller that sends the upper limit switch of signal when the limit switch of signal and reach the highest charging when preferably having one to reach minimum charging with one at least.Send signal when reaching minimum charging and will carry out feed supplement.Send signal when reaching the highest charging and will finish the charging program.If the waste side of valve has been used special tapping equipment,, can advantageously simplify feed supplement as cell rotor.Cell rotor forms a valve in the one side, and feeds simultaneously.The heating of valve is also beneficial.This will be convenient to oven dry, and can outgas in advance.Also can consider to do valve with screw rod, this screw rod hereinafter will be referred to as the valve screw rod.The valve screw rod can be a side direction extruder.This valve screw rod also can be a special feed worm or filler screw rod.According to the present invention, the valve screw rod should make particle produce enough sealing functions with particulate charge, so that realize above-mentioned vacuum with the expense of material benefit.During the screw rod long enough, the leakage that should consider on the valve screw rod can be ignored.According to the present invention, require compensation that the leakage that occurs when degassing point extracts waste vapour is carried out aspiration pump power 10% in the time, leakage can be ignored.Even the double leakage that compensates the valve screw rod of the power of pump also still can be born economically.Can realize simultaneously the continuous feed of above-mentioned extruder by the valve screw rod.Screw rod also can only form an outlet on the container of a valve.Use screw rod can also pass through the charging of material outlet scarifying container.The valve screw rod can comprehensively seal the extruder inlet at least by corresponding feeder, and the bottom feed device is then put into gas.The bottom feed device is used for the inlet screw rod of extruder.Purpose is that the Planetary Screw Extruder part is aspirated along the inlet screw rod or by its helical duct.So just needn't aspirate the Planetary Screw Extruder parts separately.Also can adorn or reequip a conduit that is directly connected to the planetary rollers wheel component in addition aspirates.Conduit leads to an independently pump.Conduit also can lead to a shared pump.This shared pump not only also aspirates the Planetary Screw Extruder parts that are used to outgas the extruder inlet and the charging of sealing then.Guiding valve in the conduit can be guaranteed, suction capactity is assigned to the zone that each will aspirate as required.Also can select to use other pump.For example, charging aperture can use pipe joint, can use a pipe joint on the throughput direction before valve, and its conduit leads to independently pump.Placing a condenser in the air intake duct on pumping direction before pump can be relatively good.As the outlet of screw rod is housed from the nearest valve of extruder, and material sends into drainpipe by a drainpipe, also can reach preferable effect.Be preferably in a getter device also is installed on the drainpipe, so that further outgas or be used to keep present vacuum.Also can heat, so that prolong the bringing-up section of material being carried out the preheating or the pre-degassing drainpipe.

Extruder is being installed one or more extruder parts according to the degasser back, they will melt the particle after the degassing.Different extruder parts have been equipped with a shared axle.Shared axle is made of a bar/pipe, extends to the end of extruder from the transmission of extruder.Sleeve pipe is pushed to this root bar/pipe, and it forms the inlet screw rod in desired location, forms the center bolt of Planetary Screw Extruder parts in other desired location, and is formed for the screw rod of particles fuse in the position that needs in addition.Each sleeve pipe is fixing on this root bar/pipe.According to the characteristic of PET, the temperature of PET will rise.For this fusing, can use extruder parts with conventional single screw rod.The PET solution that flows out from extruder can be carried and be used for different purposes, for example is used for containers such as film or bottle.Making bottle with the solution of extruding has diverse ways, and these methods are not objects of the present invention.For example, the solution that is used to make bottle can extrude or spray a shape.Known system bottle method has been brought desultory demand for PET solution.Therefore allowing solution enter a solution container continuously by extruder, and by necessary interval solution is extruded a shape by this container, will be effective.The manufacturing of film is not object of the present invention equally.Make film and need use calender and sanding machine usually.PET must under enough temperature by the press polish running roller between.This has several different methods at present.For example can use wide seam nozzle.Extruder can be wide seam nozzle necessary pressure is provided.This pressure also can produce by the solution pump of central gearshift lever.

The beneficial effects of the utility model are:

A kind of PET extrusion system of the present utility model, it is a kind of PET extrusion system that carries out mixing drying, realized the degassing of optimizing, under being lower than the PET glass transition temperature, raw material is outgased when mixing, solve the problem of PET extruder degassing difficulty, remedied the deficiency that prior art is difficult to handle the regenerative PET material.

Description of drawings

Fig. 1 is the schematic diagram of a kind of PET extrusion system of the utility model

Fig. 2 is the schematic diagram of complex screw axle

Fig. 3 is the schematic diagram of conventional planetary-screw axle

Fig. 4 is the schematic diagram of hedgehog formula engagement screws axle

Fig. 5 is the schematic diagram of another kind of feed arrangement

Wherein 1 is that transmission mechanism 2 is that inlet 3 is that planetary rollers wheel component 4 is discharging screw rods

The 5th, solution pump 6 is that wide seam nozzle 7 is that calendering running roller 8 is that container 9 is containers

The 10th, guiding valve 11 is that pump 12 is that pump 13 is that condenser 14 is heating and cooling circuits

The 15th, heating cooling circuit 16 is that heating cooling circuit 17 is heating cooling circuits

The 18th, cooling circuit 20 is that film 21 is conventional planetary-screw axles

The 22nd, hedgehog formula engagement screws axle 23 is that complex screw axle 24 is conventional engaged section

The 25th, hedgehog formula engaged section 29 is that charging aperture 30 is bar or the pipes that cross

The 31st, adding material container 32 and be valve container 33 and be valve container 34 and be 35 is valves

The 36th, discharging screw rod 37 is that delivery pipe 38 is that guiding valve 39 is that guiding valve 40 is guiding valves

The 41st, air intake duct 42 is that air intake duct 43 is that pump 44 is that pump 45 is air intake ducts

The 46th, air intake duct 47 is that guiding valve 48 is that limit switch 49 is limit switches

The specific embodiment

Below in conjunction with the specific embodiment, further set forth the present invention.

Shown in Fig. 1～5, it is a kind of PET extrusion system of the present utility model, it is a kind of PET extrusion system that carries out mixing drying, comprise feed arrangement and screw extruder, it is characterized in that: described screw extruder is made up of the single screw extrusion machine 2 that is used for charging, the single screw extrusion machine 4 that is used for mixing Planetary Screw Extruder 3 and is used for discharging, extruder is by a bar that crosses or manage 30 and realize, the bar that promptly crosses or manage 30 as the common central shaft of single screw extrusion machine 2, Planetary Screw Extruder 3 and single screw extrusion machine 4.

Wherein, described Planetary Screw Extruder 3 adopts hedgehog formula engagement screws axle or complex screw axle, and/or the planetary-screw part of barbed hedgehog formula engagement.

Described complex screw axle is the combination of hedgehog formula engagement screws axle and conventional planetary-screw axle.

The formation of described hedgehog formula engagement is owing to have the screw rod of left-handed or dextrorotation engagement or have the whole or local nut of being furnished with the different directions rotation of planetary-screw part left-handed or the dextrorotation engagement, intersects with engagement.

The maximum gradient with engagement of gradient that described screw rod or planetary-screw part are used for nut differed 50% o'clock, and/or the backlash that causes when nut aligns mutually with two corresponding planetary-screw parts or during arrangement interlaced with each other, use the planetary-screw part, the distance that staggers equates with the part of backlash or is its multiple.

Described Planetary Screw Extruder 3 can also adopt the planetary-screw axle of normal engaged to combine with the planetary-screw part of hedgehog formula engagement.

Described feed arrangement comprises two

containers

8 and 9 and guiding valves placed in the middle 10, has a batching conduit to feed screw extruder inlet 2 from container 8; Feed arrangement forms vacuum by pump 11 in container 9, container 8 by the vacuum of pump 12 manufacturings, inserts condenser 13 in the conduit of inlet between 2 on the conduit before the pump 12.

The described bar that crosses or manage 30 and heat by heating and cooling circuit 14, single screw extrusion machine 2 is provided with heating cooling circuit 15 and heats, Planetary Screw Extruder 3 is cooled off by heating cooling circuit 16, single screw extrusion machine 4 is by 17 heating of heating cooling circuit, and each screw extruder all has exhaust outlet.

Described system also is included in single screw extrusion machine 4 backs that are used for discharging and inserts solution pump 5, and solution pump 5 connects wide seam nozzle 6, at wide seam nozzle 6 jet holes calendering running roller 7 is installed, and calendering running roller 7 is by 18 coolings of cooling circuit.

Described feed arrangement can also be to comprise that charging aperture 29 leads to a funnel shaped material container 31 that adds, add the top that material container container 31 is arranged on a valve container 32, valve container 32 is located at the top of another valve container, there is a discharging screw rod 36 to lead to a delivery pipe 37 from valve container 33, a valve or guiding valve 34 have been established between two

containers

31 and 32, a valve or guiding valve 35 have been established between the

container

32 and 33, each container all is provided with

air intake duct

42,41,46 and 45 and

pump

43 and 44, respectively to

container

31,32,33 and delivery pipe 37 bleed,

air intake duct

Fig. 1 has shown an extruder that has following component/part: transmission mechanism 1, inlet 2, planetary rollers wheel component 3, discharging screw rod 4, solution pump 5, wide seam nozzle 6.Batching flows into inlet 2 by the valve of dual serial.Two valves comprise two

containers

8 and 9 and guiding valves placed in the middle 10.There is a batching conduit to feed inlet 2 from container 8.Container 9 fills up and tube wall with the PET particle in the mode that does not show in scheming.Then in container 9, form vacuum by pump 11.So as far as possible the air of sealing is extracted out.Heat simultaneously, dry the PET particle.PET particulate from reservoir device 9 after the heating is transported to the guiding valve of opening in the container 8 10.Container 8 continuation are heated the PET particle and are dried.Then guiding valve 10 cuts out, and the PET particle continues preheating and sends into inlet 2.From container 8 to the conduit the inlet 2, produced vacuum like this by pump 12 manufacturings.The PET particle arrives inlet 2 and carries extruding on the direction with form in bulk.Extrude direction for from left to right among the figure.In inlet 2, continue heating.Be provided with heating cooling circuit 15 and heat the PET particle.Dehumidify by the moisture of the vacuum in oven dry and batching and the entrance area to the adhesion of PET particle surface.The PET particle arrives next extruder parts, and promptly the Planetary Screw Extruder parts 3.In Planetary Screw Extruder parts 3, the PET particle between the extruder shell of planetary-screw axle, center bolt and the interior engagement of running is repeatedly mixing, constantly produces new surface, makes the moisture of sealing to dehumidify.Simultaneous temperature keeps substantially.This depends on cooling, because the strain energy of distortion of bringing into when mixing has been converted to heat.Cooling is undertaken by heating cooling circuit 16.

Planetary Screw Extruder parts among Fig. 3 have adopted conventional planetary-screw axle 21.In application example, be provided with five planetary-screw axles, in other application example more or less axle can be set.Planetary-screw axle 21 has formed multi-thread screw rod, keeps gradient constant in the whole length of axle.Screw pitch among the figure plots the lines of the longitudinal axis of oblique process main shaft.In application example, the screw pitch of right side view is the clockwise direction right.Screw rod has an engagement in the outside.Dui Cheng engagement is positioned at the center bolt of Planetary Screw Extruder parts and the shell on every side of engagement with it, and planetary-screw axle 21 both can also can mesh with center bolt with the shell engagement like this.

Fig. 4 has shown the planetary-screw axle 22 in the Another Application example, and the one side has the screw pitch identical with the screw/shaft of Fig. 3.Simultaneously at opposite side, axle has left-handed nut, and the screw rod of dextrorotation is cut.Left-handed nut represents with lines that in Fig. 4 the screw pitch right angle intersection with known among Fig. 3 is expressed as crossing lines.Brace in the cross section between the screw pitch of the tooth of formation engagement cuts off by the nut that intersects.The tooth that stays between two partitions has formed the tooth of a needle-like/projection.Many pin/the projections that are close to mutually allow the people remember hedgehog thorn on one's body.Therefore the engagement of hedgehog formula gains the name.The part of cutting off is commonly referred to as backlash.

Fig. 2 has shown more multirow star small screw 23, has parts 25 and parts 24 that imitate the engagement of Fig. 4 of the engagement of an imitation Fig. 3.

The moisture of evaporation is discharged by the inlet screw rod, because the accumulation situation of PET particle and motion conditions are enough loose in the screw pitch, and screw pitch fills up with the PET particle in that inlet screw rod end is just local.Waste vapour through the inlet screw rod mainly enters the conduit that leads to pump 12.Steam condenses in condenser 13 and discharges in the conduit.The PET particle is sent into discharging screw rod 4 with constant temperature from Planetary Screw Extruder parts 3 substantially.The discharging screw rod is compared the task of not forming pressure with the conventional discharging screw rod in the application example.Therefore established solution pump 5 extruding the direction downstream.Discharging screw rod 4 should melt the PET particle.Therefore the temperature of PET particle will raise.Heating is carried out by heating cooling circuit 17 and based on the metamorphosis of discharging screw rod.According to screw pitch and screw rod cross section, the structure of discharging screw rod should form pressure, and other metamorphosis under the temperature that is reached influences the plasticizing of PET particle.Whole extruder realized by a bar that crosses/pipe 30.Insert on the pipe 30 or pressed from both sides different sleeve pipes, a single screw rod is arranged in entrance area 2 like this, in zone 3, a center bolt is arranged, in zone 4, also have a single screw rod.To managing 30 heating.Heating is undertaken by heating and cooling circuit 14.Increase the pressure of the solution that from discharging screw rod 4, comes out by solution pump 5, make solution uniform distribution and form film 20 and leniently stitch in the nozzle and flow out in wide seam nozzle 6.Film enters the calendering running roller 7 of cooling at once, and degree of depth cooling also reaches required thickness, has so just produced required PET film.The cooling that cooling circuit 18 is used to roll running roller.

Fig. 5 is the schematic diagram of another kind of feed arrangement, has shown the material charging of Another Application example.Here be provided with the charging aperture 29 of PET particle, charging aperture 29 leads to a funnel shaped material container 31 that adds, add the top that material container container 31 is arranged on a valve container 32, valve container 32 is located at the top of another valve container, have a discharging screw rod 36 to lead to a delivery pipe 37 from valve container 33, the PET particle arrives extruder from delivery pipe 37.Establish a valve/guiding valve 34 between two

containers

31 and 32, established a valve/guiding valve 35 between the container 32 and 33.All

containers

31,32,33 and delivery pipe 37 are heated.All

containers

31,32,33 and delivery pipe 37 are bled.Be provided with

air intake duct

42,41,40,46 and 45 and

pump

43 and 44 in addition.Established guiding

valve

38,39,40 and 47 in the

air intake duct

42,41,40,46 and 45.By bleeding of preheating and air intake duct material is outgased in advance.The operation of valve is controlled by switch, i.e. a limit switch 48 and a upper limit switch 49.When the filling of container reached the minimum charging quantity of extruder material charging, limit switch 48 connects carried out feed supplement to container 33.Valve/guiding valve 34 cuts out then, and valve/guiding valve 35 is opened, and the material of dress can flow into container 33 in the container 32 like this.The capacity of container 33 is greater than the capacity of container 32, and container 33 just can not overfill like this.After container 32 empties, valve/guiding valve 35 will cut out, and valve/guiding valve 34 is opened, and the PET particle will flow into container 32 from container 31 like this.Reach enough charging levels, and upper limit switch 49 is when connecting, the charging process just stops by valve-off/guiding valve 34.When valve/guiding valve 34 cuts out, container 32 will be bled by air intake duct by

different pump

43 and 44 with 33.At the opening part of valve/guiding valve 34, pumping process will be by the operation disruption to guiding valve 38 and 39.Container is cleaned by the valve that does not show among the figure as need, adopt guiding

valve

38,39,40 and 47 to interrupt pumping process.

Through evidence, a kind of PET extrusion system of the present utility model has solved the problem of PET extruder degassing difficulty really, has remedied the deficiency that prior art is difficult to handle the regenerative PET material.

Claims

1. PET extrusion system, comprise feed arrangement and screw extruder, it is characterized in that: described screw extruder is made up of the single screw extrusion machine that is used for charging (2), the single screw extrusion machine (4) that is used for mixing Planetary Screw Extruder (3) and is used for discharging, extruder realizes that by a bar that crosses or pipe (30) bar that promptly crosses or pipe (30) are as single screw extrusion machine (2), Planetary Screw Extruder (3) and the common central shaft of single screw extrusion machine (4).

2. a kind of PET extrusion system as claimed in claim 1 is characterized in that, described Planetary Screw Extruder (3) adopts hedgehog formula engagement screws axle or complex screw axle, and/or the planetary-screw part of barbed hedgehog formula engagement.

3. a kind of PET extrusion system as claimed in claim 2 is characterized in that, described complex screw axle is the combination of hedgehog formula engagement screws axle and conventional planetary-screw axle.

4. a kind of PET extrusion system as claimed in claim 1, it is characterized in that, the formation of described hedgehog formula engagement is owing to have the screw rod of left-handed or dextrorotation engagement or have the whole or local nut of being furnished with the different directions rotation of planetary-screw part left-handed or the dextrorotation engagement, intersects with engagement.

5. a kind of PET extrusion system as claimed in claim 2, it is characterized in that, the maximum gradient with engagement of gradient that described screw rod or planetary-screw part are used for nut differed 50% o'clock, and/or the backlash that causes when nut aligns mutually with two corresponding planetary-screw parts or during arrangement interlaced with each other, use the planetary-screw part, the distance that staggers equates with the part of backlash or is its multiple.

6. a kind of PET extrusion system as claimed in claim 1 is characterized in that, described Planetary Screw Extruder (3) can also adopt the planetary-screw axle of normal engaged to combine with the planetary-screw part of hedgehog formula engagement.

7. a kind of PET extrusion system as claimed in claim 1 is characterized in that, described feed arrangement comprises two containers (8) and (9) and a guiding valve placed in the middle (10), has a batching conduit to feed screw extruder inlet (2) from container (8); Feed arrangement forms vacuum by pump (11) in container (9), container (8) arrives in the conduit that enters the mouth between (2) vacuum by pump (12) manufacturing, inserts condenser (13) on the preceding conduit of pump (12).

8. a kind of PET extrusion system as claimed in claim 1, it is characterized in that, described bar that crosses or pipe (30) heat by heating and cooling circuit (14), single screw extrusion machine (2) is provided with heating cooling circuit (15) and heats, Planetary Screw Extruder (3) is cooled off by heating cooling circuit (16), single screw extrusion machine (4) is by heating cooling circuit (17) heating, and each screw extruder all has exhaust outlet.

9. a kind of PET extrusion system as claimed in claim 1, it is characterized in that, described system also is included in single screw extrusion machine (4) back that is used for discharging and inserts solution pump (5), solution pump (5) connects wide seam nozzle (6), at wide seam nozzle (6) jet hole calendering running roller (7) is installed, calendering running roller (7) is by cooling circuit (18) cooling.

10. a kind of PET extrusion system as claimed in claim 1, it is characterized in that, described feed arrangement can also be to comprise that charging aperture (29) leads to a funnel shaped material container (31) that adds, add the top that material container container (31) is arranged on a valve container (32), valve container (32) is located at the top of another valve container, there is a discharging screw rod (36) to lead to a delivery pipe (37) from valve container (33), a valve or guiding valve (34) have been established between two containers (31) and (32), a valve or guiding valve (35) have been established between container (32) and (33), each container all is provided with air intake duct (42), (41), (46) and (45) and pump (43) and (44), respectively to container (31), (32), (33) and delivery pipe (37) bleed, air intake duct (42), (41), (46) and established guiding valve (38) in (45), (39), (40) and (47), container (33) is provided with limit switch (48), and container (32) is provided with upper limit switch (49).