CN109435194A - One kind being used for thermoplastic polyester foaming and forming apparatus - Google Patents
One kind being used for thermoplastic polyester foaming and forming apparatus Download PDFInfo
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- CN109435194A CN109435194A CN201811534003.8A CN201811534003A CN109435194A CN 109435194 A CN109435194 A CN 109435194A CN 201811534003 A CN201811534003 A CN 201811534003A CN 109435194 A CN109435194 A CN 109435194A
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- Prior art keywords
- screw extruder
- double screw
- twin
- foaming
- vacuum
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- 229920000728 polyester Polymers 0.000 title claims abstract description 69
- 238000005187 foaming Methods 0.000 title claims abstract description 55
- 229920001169 thermoplastic Polymers 0.000 title claims abstract description 37
- 239000004416 thermosoftening plastic Substances 0.000 title claims abstract description 37
- 238000001125 extrusion Methods 0.000 claims abstract description 43
- 238000002347 injection Methods 0.000 claims abstract description 18
- 239000007924 injection Substances 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 230000003068 static effect Effects 0.000 claims abstract description 10
- 239000004604 Blowing Agent Substances 0.000 claims abstract description 9
- 239000000155 melt Substances 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 5
- 241000251468 Actinopterygii Species 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 20
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 238000001035 drying Methods 0.000 abstract description 12
- 239000006260 foam Substances 0.000 abstract description 11
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 4
- 239000002994 raw material Substances 0.000 abstract description 4
- 230000008569 process Effects 0.000 description 14
- 239000004088 foaming agent Substances 0.000 description 12
- 239000000243 solution Substances 0.000 description 10
- 239000007789 gas Substances 0.000 description 8
- 239000000654 additive Substances 0.000 description 6
- 230000000996 additive effect Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000004970 Chain extender Substances 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 5
- 238000006731 degradation reaction Methods 0.000 description 5
- 238000010521 absorption reaction Methods 0.000 description 4
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000012752 auxiliary agent Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 229920001225 polyester resin Polymers 0.000 description 2
- 239000004645 polyester resin Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 239000006057 Non-nutritive feed additive Substances 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000006085 branching agent Substances 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 238000002036 drum drying Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- -1 empty set system Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 229920002313 fluoropolymer Polymers 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005213 imbibition Methods 0.000 description 1
- 238000011081 inoculation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000002667 nucleating agent Substances 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 238000006068 polycondensation reaction Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 208000016261 weight loss Diseases 0.000 description 1
- 230000004580 weight loss Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2075/00—Use of PU, i.e. polyureas or polyurethanes or derivatives thereof, as moulding material
Abstract
The present invention relates to one kind to be used for thermoplastic polyester foaming and forming apparatus, it include: double screw extruder, Melt Pump, static mixer, foaming die, forming device and vacuum system, the draw ratio of the twin-screw of double screw extruder is 35~45, a natural exhaust outlet is offered on twin-screw machine barrel, at least one vaccum exhaust outlet and at least one blowing agent injection port, vacuum system is connected with the vaccum exhaust outlet on twin-screw machine barrel, the vacuum degree of double screw extruder vacuum evacuation section can be made to adjust between 20Pa~200Pa, device controls melt temperature using cooling system.Device is that thermoplastic polyester exempts from dry reaction extrusion foaming Integral producing apparatus, polyester raw material, which is not required to drying, to be directly added into double screw extruder, it reduces energy consumption and improves production efficiency, can be with steady production low-density, the thermoplastic polyester foaming plate of uniform fine and closely woven, the big thickness of foam structure, and have the advantages that high production efficiency, low energy consumption, technique is easy to operate, production stability is high.
Description
Technical field
The present invention relates to a kind of device for preparing polymer, in particular to a kind of to be used for thermoplastic polyester foaming and forming apparatus.
Background technique
Thermoplastic polyester has excellent heat resistance and mechanical property, compared to traditional foamed plastics, thermoplastic polyester
Foam have high temperature under good stability of the dimension, excellent mechanical performance and fatigue resistance, low cigarette, fire-retardant, nontoxic, low water absorption,
Good barrier properties for gases and recyclable the advantages that recycling, have in fields such as wind-power electricity generation, rail traffic, auto industrys
Wide application prospect.But thermoplastic polyester has, and melt viscosity is low, thermal stability is poor, thermal degradation and water occur for easy absorption moisture
Solution, especially hydrolyzes, will cause molecular weight of polyesters and sharply decline；The shortcomings that in order to overcome thermoplastic polyester, the prior art are main
The viscosity of polyester is improved by addition chain extender or crosslinking agent, solid phase polycondensation after polyfunctional group auxiliary agent can be added in polymerization again
Obtain the thermoplastic polyester of high melt viscosity；Or polyfunctional group chain extender or branching agent are added in extrusion process, reaction is squeezed
High-viscosity polyester is obtained out.Water imbibition and pyrohydrolysis disadvantage for polyester, the prior art generally use predrying technology and remove
Remove the moisture in polyester slice.There are commonly vacuum drum dryings, three kinds of combination drying and thermopnore etc. of revolution filling for predrying
Form, commonly use continous way pneumatic conveying drying, drying process be 140 DEG C, 3-4 hours, and to be kept the temperature at 100-110 DEG C after drying or
It is stand-by to be placed in dry closed container, loading hopper is also with infrared radiation to keep dry state, or uses N2Protection is fed
Expect device.The device is complicated for this pre-drying process, and time-consuming for drying process, low efficiency and energy consumption height.
In order to overcome the disadvantage, US 2015336319A1 discloses a kind of polyester foamed extrusion device, comprising: charging system
System, parallel dual-screw extruding machine, head and shaping equipment, wherein there is air exhaust area and vacuum evacuation on double screw extruder
The temperature in area, air exhaust area is lower than 10 DEG C of melting point polyester, and the melt temperature for being vacuum-evacuated area is higher than the fusing point of polyester, especially
In first exhaust area, the nitrogen of injection preheating is to enhance air exhaust effect.The device can realize that polyester is exempted from dry directly extrude and added
Work overcomes the shortcomings that pre-drying process is time-consuming, energy consumption is high and the device is complicated to a certain extent.But the disadvantage is that in first exhaust area
Injection preheating nitrogen gas preparing and complicated for operation.
CN201220654257.5 discloses a kind of PET without crystallizing and drying twin-screw sheet material extrusion equipment, including feeding
Device, screw extruder and sheet material extrusion device, wherein screw extruder is equidirectional parallel double-screw extruder, is configured with thereon
Multiple vacuum evacuation devices.For the art solutions in order to improve dehydration efficiency, the vacuum for disclosing vacuum pump in embodiment is absolute
Pressure≤0.5mbar, deaeration capacity are greater than 1000l/s.This technical solution in pet reaction extrusion and foaming process for needing
It adds and lacks adaptability for a variety of low molecule additive components, excessively high vacuum degree and amount of gas evolved will cause low molecule additive
(chain extender, plasticizer etc.) is detached by vacuum, so that chain extending reaction efficiency reduces, polyester fondant viscoplasticity cannot reach hair
Bubble requires, and cannot achieve PET and exempts from dry reaction extrusion foaming integration production.
US5958164 discloses a kind of thermoplastic polyester foaming method, comprising: polyester and additive are directly added into first
It is vacuum-evacuated the moisture of section abjection polyester absorption in rank double screw extruder, on double screw extruder, is then injected into foaming agent,
Down stream low pressure zones foam to obtain PET foaming product, and fluoroplastics are particularly added in polyester, and vacuum outgas pressure is lower than 20Torr
(2666pa), foaming agent from second-order single screw extrusion machine gas injection port inject.The technical solution foaming agent (butane) is from
The injection of second order single screw extrusion machine, and single screw rod diameter is equal with twin-screw diameter, in order to keep foaming agent and PET melt sufficiently mixed
It closes, single screw rod revolving speed is higher, and handling ease generates high shear heat, is unable to accurately control PET melt temperature, causes extrusion process not
Stablize, the disadvantages such as head pressure is low, it is difficult to obtain expansion density lower than 200kg/m3And thickness is greater than the PET foamed board of 30mm
Material.
Summary of the invention
To realize the efficient, stable of thermoplastic polyester foaming, high-quality production, the present invention provides one kind for heat
The polyester foamed molding machine of plasticity.
According to an aspect of the invention, there is provided a kind of be used for thermoplastic polyester foaming and forming apparatus, including twin-screw
Extruder, Melt Pump, single screw extrusion machine, static mixer, foaming die and forming device, double screw extruder
The draw ratio of twin-screw between 35~45, offered on the machine barrel of double screw extruder a natural exhaust outlet, at least one
Vaccum exhaust outlet and at least one blowing agent injection port；The diameter of the single screw rod of single screw extrusion machine is more than or equal to the straight of twin-screw
1.5 times of diameter, the draw ratio of single screw rod carry out temperature control to single screw rod between 15~30, using cooling system；Device is also
Including vacuum system, vacuum system is connected with the vaccum exhaust outlet of double screw extruder, and double screw extruder vacuum can be made to arrange
The vacuum degree of gas section is adjusted between 20Pa~200Pa.
Preferably, in above-mentioned apparatus, the diameter of single screw rod is 1.5~3 times of the diameter of twin-screw.
Preferably, in above-mentioned apparatus, double screw extruder be respectively set along its length feeding section, natural exhaust section,
First seal section, vacuum evacuation section, the second seal section, gas injection section, mixing section and metering conveying section.
Preferably, in above-mentioned apparatus, Melt Pump is mounted between double screw extruder and single screw extrusion machine.
Preferably, in above-mentioned apparatus, the revolving speed of Melt Pump and single screw extrusion machine is controlled by closed loop pressure feedback is
System automatically adjusts.
Preferably, in above-mentioned apparatus, foaming die is fish tail plate-type head, annular head, T-type side fall roof caving or more
Hole head.
Preferably, in above-mentioned apparatus, the vacuum evacuation segment length of double screw extruder is 10 times of the diameter of twin-screw
~18 times.
According to another aspect of the present invention, it provides a kind of for thermoplastic polyester foaming and forming apparatus, including double spiral shells
Bar extruder, Melt Pump, melt cooler, static mixer, foaming die and forming device, double screw extruder
The draw ratio of twin-screw between 35~45, offered on the machine barrel of double screw extruder a natural exhaust outlet, at least one
Vaccum exhaust outlet and at least one blowing agent injection port；Melt cooler is suitable for the cooling of high viscosity melt, and passes through cooling
System controls melt temperature；Device further includes vacuum system, and vacuum system is connected with the vaccum exhaust outlet of double screw extruder,
The vacuum degree of double screw extruder vacuum evacuation section can be made to adjust between 20Pa~200Pa.
Preferably, in above-mentioned apparatus, Melt Pump is mounted between double screw extruder and melt cooler.
Preferably, in above-mentioned apparatus, the revolving speed of Melt Pump is automatically adjusted by closed loop pressure feedback control system.
Preferably, in above-mentioned apparatus, the vacuum evacuation segment length of double screw extruder is 10 times of the diameter of twin-screw
~18 times.
It is that a kind of thermoplastic polyester is exempted from dry reaction and squeezed out provided by the present invention for thermoplastic polyester foaming and forming apparatus
Foaming Integral producing apparatus can be pre-dried in foam process to avoid polyester, and polyester raw material does not need drying can be straight
It connects and adds twin-screw extrude, reduce energy consumption and improve production efficiency.Device provided by the invention can be low with steady production
Density, foam structure uniformly fine and closely woven, big thickness thermoplastic polyester foaming plate, and have high production efficiency, low energy consumption, technique
Advantage easy to operate, production stability is high.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described.
Fig. 1 is the schematic diagram for thermoplastic polyester foaming and forming apparatus of preferred embodiment in accordance with the present invention.
Fig. 2 is the schematic diagram for thermoplastic polyester foaming and forming apparatus according to another preferred embodiment of the invention.
Specific embodiment
The invention discloses one kind be used for thermoplastic polyester foaming and forming apparatus, comprising: double screw extruder, Melt Pump,
Static mixer, foaming die and forming device, the draw ratio of the twin-screw of double screw extruder are double between 35~45
A natural exhaust outlet, at least one vaccum exhaust outlet and the injection of at least one foaming agent are offered on the machine barrel of screw extruder
Mouthful；Device further includes vacuum system, and vacuum system is connected with the vaccum exhaust outlet of double screw extruder, can make twin-screw extrusion
The vacuum degree of machine vacuum evacuation section is adjusted between 20Pa~200Pa, and device carries out temperature to single screw rod using cooling system
Accurate control.
Fig. 1 is the schematic diagram for thermoplastic polyester foaming and forming apparatus of preferred embodiment in accordance with the present invention.Such as Fig. 1
Shown, device includes multistation feed system (not shown), double screw extruder 1, Melt Pump 3, single screw extrusion machine 4, static state
Mixer 6, foaming die 7 and forming device 8 and vacuum system 2, wherein Melt Pump 3 is mounted on 1 He of double screw extruder
Between single screw extrusion machine 4, static mixer 6 is mounted between foaming die 7 and single screw extrusion machine 4, forming device 8
It is mounted on the downstream of foaming die 7.Wherein, offered on the machine barrel of double screw extruder a natural exhaust outlet, at least one
Vaccum exhaust outlet and at least one blowing agent injection port, vacuum system 2 pass through the vaccum exhaust outlet of pipeline and double screw extruder 1
It is connected, the vacuum degree of double screw extruder vacuum evacuation section can be made to adjust between 20Pa~200Pa.
The multistation feed system of device is weight-loss type feed system, generally includes at least one main feed system and at least
One additive feed system.Main feed system is preferably two, can be by the heat of completely new thermoplastic polyester and recycling
Plasticity polyester resin presses sets requirement metering feeding.Additive feed system is preferably two, respectively chain extender feed system
With auxiliary agent feed system, more preferably three, respectively chain extender feed system, foaming nucleation agent feed system and processing aid
System, with conveniently regulating and controlling formula.Feed system outlet is connected with the feed opening of double screw extruder 1.
In preferred embodiment shown in Fig. 1, connect for thermoplastic polyester foaming and forming apparatus using Dual inoculation
System, the first rank are double screw extruder 1, and second-order is single screw extrusion machine 4, are connected between two extruders with Melt Pump 3,
Wherein double screw extruder 1 is co-rotating twin screw extruder.The diameter D1 of the twin-screw of double screw extruder 1, length are
L1, double screw extruder 1 are responsible for the functions such as melting, exhaust, the foaming agent injection of polyester resin and the uniform mixing of each component,
In order to which these functions are better achieved, and avoid thermoplastic polyester that thermal degradation, the twin-screw of double screw extruder 1 occur wherein
Draw ratio L1/D1 between 35:1~45:1, be respectively set along its length feeding section, natural exhaust section, the first seal section,
It is vacuum-evacuated section, the second seal section, mixing section and metering conveying section.It, will if the draw ratio of double screw extruder 1 is less than 35:1
It can make to be vacuum-evacuated section or mixing section is too short, can not repeat to be vented and mix foaming agent uniformly, influence extrusion and foaming process
It is uniform and stable；If draw ratio is greater than 45:1, more serious thermal degradation easily occurs for thermoplastic polyester, so that the melt viscosity of polyester
It substantially reduces, is unable to get ideal foaming product.Preferably exist between 10D1~18D1 to guarantee to be vacuum-evacuated effect
12D1~15D1.Vacuum evacuation segment length is greater than 18D1, and to will lead to the entire draw ratio of twin-screw too long, will affect less than 10D1 de-
Gas effect.In foam process, polyester raw material, which does not need drying, to be directly added into double screw extruder, squeezed by twin-screw
The moisture of natural exhaust outlet on machine and the abjection absorption of at least one vaccum exhaust outlet out.
The vacuum system of the present apparatus is high vacuum system, is made of multistage vacuum pump, aspirating chamber, drainer, passes through pipe
Road is connected with the vaccum exhaust outlet on double screw extruder 1, and high vacuum system can make double screw extruder be vacuum-evacuated section
Vacuum degree be lower than 200pa, be preferably adjusted between 20~200pa.The speed of exhaust 100L/s of high vacuum system~
500L/s, preferably 300L/s~500L/s.
The major function of second-order single screw extrusion machine 4 is to convey double screw extruder 1 to come containing foaming agent
Polyester fondant uniformly cools down Tm-10℃≤T≤Tm+30℃,TmFor the fusing point of polyester, while the expansion of thermoplastic polyester (e.g., PET)
Chain reaction is completed in single screw extrusion machine, and device carries out the accurate control of temperature using cooling system 9 to single screw rod.Not only want
It asks the single screw rod of single screw extrusion machine 4 to have stronger exchange capability of heat, melt temperature is reduced to the temperature for being suitble to foaming, Er Qieyao
Melt temperature uniform throughout is sought, shear heat is lower when single screw rod rotates, and has certain melt conveying ability, is sent out in this way
Brewage structure could uniformly, and extrusion process can stablize progress.In order to realize the purpose, technical scheme single screw rod squeezes out
The diameter D2 of the single screw rod of machine 4, length L2, the diameter D2 of single screw rod are more than or equal to 1.5 times of twin-screw diameter D1, preferably
1.5~3 times, more preferable 2~2.5 times, the draw ratio L2/D2 of single screw extrusion machine 4 is between 15~30.If draw ratio L2/
D2 will be unable to reach cooling requirement less than 15；If draw ratio L2/D2 is greater than 30, polyester thermal degradation influences polyester than more serious
Foaming product quality, percent opening increase.
In the foaming process of thermoplastic polyester, double screw extruder head pressure is excessively high to be easy to cause material in twin-screw
In the resistance that is subject to increase, foaming agent injection is difficult, and the Shear heating that in addition material is subjected in twin-screw increases, and heat easily occurs
Degradation, influences product quality, and hypotony will cause foaming agent and dissolve difficulty in polyester fondant.In order to improve foaming product
Nucleation density is usually required that with sufficiently high head pressure, and second-order single screw rod is primarily to reduction melt temperature, institute
It is weaker with the conveying capacity of melt, especially to low temperature high-viscosity melt conveying capacity.To solve the above-mentioned problems, it is preferred that
One Melt Pump 3 is installed between double screw extruder and single screw extrusion machine, for adjusting double screw extruder outlet pressure
Power and single screw extrusion machine inlet pressure guarantee extrusion process stable operation.As polyester chain extending reaction carries out, melt viscosity meeting
It increased dramatically, mobility reduces, and Melt Pump 3 is set as high-viscosity melt conveying and provides power, is conducive to extrusion process and stablizes fortune
Row.The revolving speed of Melt Pump 3 can be by manually adjusting, can also be by the pressure of monitoring entrance, using automatic feedback
Control system controls its revolving speed.In order to guarantee the stable operation of double screw extruder 1, need to make double screw extruder outlet with
Melt pressure between melt pump intake will pass through pressure by actual pressure herein preferably between 3MPa~8MPa lower than 8MPa
Force snesor collects in control system, passes through programmable logic controller (PLC) (PLC) program feedback control melt of control system
The revolving speed of pump 3.When pressure is lower than setting value herein, control system reduces the revolving speed of Melt Pump 3 automatically, on the contrary, ought press herein
When power is higher than setting value, the revolving speed of Melt Pump 3 improves automatically, so that pressure at this be made to stablize in setting value.Similarly, it can use
Closed loop feedback system controls single screw rod revolving speed to guarantee that single screw extrusion machine entrance has certain pressure value, for example, 15MPa~
Any setting value between 20MPa.
Foaming die 7 can be fish tail plate-type head, annular head, T-type side fall roof caving or porous head.Foaming machine
First 7 are connected with single screw extrusion machine outlet, so that material flows wherein is evenly distributed on entire width direction.
One static mixer 6 can also be set between foaming die 7 and single screw extrusion machine 4, the temperature of melt can be made
Degree and flow velocity are homogenized before entering foaming die 7, are conducive to keep extrusion process stable and the appearance and quality of product
More evenly.
Foaming agent injected system can be the liquid pumps such as plunger type microprocessor pump drive, diaphragm pump, piston pump, and pass through pipeline
It is connected with the gas injection valve on double screw extruder 1.Diaphragm pump or plunger type metering pump are preferably used, is prevented with certain
Quick-fried grade, pump discharge maximum pressure are more than or equal to 20MPa.It preferably, can be by shown in Fig. 1 and double in foam process
The connected gas injection system 5 of screw extruder 1 injects physical blowing agent into the polyester fondant of twin-screw.
Extrusion system downstream is installed on foaming die 7 equipped with forming device, forming device 8 as shown in Figure 1
Downstream with the polyester cooling and shaping for that will foam.
Fig. 2 is another preferred embodiment disclosed by the invention for thermoplastic polyester foaming and forming apparatus, such as Fig. 2 institute
Show, device includes double screw extruder 1, vacuum system 2, Melt Pump 3, melt cooler 10, static mixer 6, foaming die 7
With forming device 8.The draw ratio of the twin-screw of double screw extruder 1 is between 35~45, the machine barrel of double screw extruder
On offer a natural exhaust outlet, at least one vaccum exhaust outlet and at least one blowing agent injection port, vacuum system 2 and double
The vaccum exhaust outlet of screw extruder 1 is connected, and the vacuum degree of double screw extruder vacuum evacuation section can be made in 20Pa~200Pa
Between adjust, the vacuum evacuation segment length of double screw extruder 1 is 10 times~18 times of the diameter of twin-screw；Melt Pump 3 is installed
Between double screw extruder 1 and melt cooler 10, the revolving speed of Melt Pump 3 is carried out automatic by closed loop pressure feedback control system
It adjusts；Melt cooler 10 is suitable for the cooling of high viscosity melt, and realizes accurate melt temperature control by cooling system 9
System.Static mixer 6 is mounted on 7 upstream of foaming die.
In the preferred embodiment of device as shown in Figure 2, device can also include multistation feed system (not shown)
With single screw extrusion machine (not shown) etc..In the preferred embodiment, the description of each composition partial parameters of device and make
It is identical as the description of the device above by reference to Fig. 1 with the setting of parameter in the process.
The technique that foam shaping by extrusion is carried out to thermoplastic polyester using the device of the invention, comprising: by thermoplastic polyester
And additive is added through multistation feed system by co-rotating twin screw extruder, Melt Pump, single screw extrusion machine, Gao Zhen
In the extrusion system of compositions such as empty set system, foaming agent injected system, forming device；Into the polyester fondant in extrusion system
Physical blowing agent is injected, forms homogeneous phase solution through double screw extruder immixture, foaming then will be contained by cooling system
The polyester fondant temperature of agent reduces, and through mouth mold extrusion foaming, foaming product is cooled and shaped on forming device and obtains thermoplastic
The polyester foamed product of property.The density of obtained polyester foamed product is in 60~300kg/m3Between.
It is that a kind of thermoplastic polyester is exempted from dry reaction and squeezed out provided by the present invention for thermoplastic polyester foaming and forming apparatus
Foaming Integral producing apparatus can be pre-dried in foam process to avoid polyester, and polyester raw material does not need drying can be straight
It connects and adds twin-screw extrude, reduce energy consumption and improve production efficiency.And device provided by the invention can be with steady production
The thermoplastic polyester foaming plate of uniform fine and closely woven, the big thickness of low-density, foam structure, with high production efficiency, low energy consumption, technique
Advantage easy to operate, production stability is high.
Above embodiments, only a specific embodiment of the invention, to illustrate technical solution of the present invention, rather than to it
Limitation, scope of protection of the present invention is not limited thereto, although the present invention is described in detail referring to the foregoing embodiments,
Those skilled in the art should understand that: anyone skilled in the art the invention discloses technology model
In enclosing, still it can modify to technical solution documented by previous embodiment or variation can be readily occurred in, or to it
Middle some technical characteristics are equivalently replaced；And these modifications, variation or replacement, do not make the essence of corresponding technical solution de-
Spirit and scope from technical solution of the embodiment of the present invention, should be covered by the protection scope of the present invention.Therefore, of the invention
Protection scope should be subject to the protection scope in claims.
Claims (10)
1. one kind is used for thermoplastic polyester foaming and forming apparatus, including it is double screw extruder, Melt Pump, single screw extrusion machine, quiet
State mixer, foaming die and forming device, which is characterized in that the draw ratio of the twin-screw of the double screw extruder
Between 35~45, a natural exhaust outlet, at least one vaccum exhaust outlet and at least are offered on the machine barrel of the twin-screw
One blowing agent injection port；The diameter of the single screw rod of the single screw extrusion machine is more than or equal to the 1.5 of the diameter of the twin-screw
Times, the draw ratio of the single screw rod carries out temperature control to the single screw rod between 15~30, using cooling system；The dress
Setting further includes vacuum system, and the vacuum system is connected with the vaccum exhaust outlet of the double screw extruder, can be made double
The vacuum degree of screw extruder vacuum evacuation section is adjusted between 20Pa~200Pa.
2. the apparatus according to claim 1, which is characterized in that the diameter of the single screw rod is the diameter of the twin-screw
1.5~3 times.
3. the apparatus according to claim 1, which is characterized in that the double screw extruder is respectively set along its length to be added
Expect section, natural exhaust section, the first seal section, vacuum evacuation section, the second seal section, gas injection section, mixing section and metering conveying section.
4. the apparatus according to claim 1, which is characterized in that the Melt Pump is mounted on the double screw extruder and institute
It states between single screw extrusion machine.
5. the apparatus according to claim 1, which is characterized in that the revolving speed of the Melt Pump and the single screw rod passes through closed loop
Pressure feedback control system automatically adjusts.
6. the apparatus according to claim 1, which is characterized in that the foaming die is fish tail plate-type head, annular machine
Head, T-type side fall roof caving or porous head.
7. one kind is used for thermoplastic polyester foaming and forming apparatus, including double screw extruder, Melt Pump, melt cooler, static state
Mixer, foaming die and forming device, which is characterized in that the draw ratio of the twin-screw of the double screw extruder exists
Between 35~45, natural an exhaust outlet, at least one vaccum exhaust outlet and at least one are offered on the machine barrel of the twin-screw
A blowing agent injection port；The melt cooler is suitable for the cooling of high viscosity melt, and controls melt temperature by cooling system
Degree；Described device further includes vacuum system, and the vacuum system is connected with the vaccum exhaust outlet of the double screw extruder
It connects, the vacuum degree of double screw extruder vacuum evacuation section can be made to adjust between 20Pa~200Pa.
8. device according to claim 7, which is characterized in that the Melt Pump is mounted on the double screw extruder and melts
Between body cooler.
9. device according to claim 7, which is characterized in that the revolving speed of the Melt Pump is controlled by closed loop pressure feedback
System automatically adjusts.
10. device according to claim 7, which is characterized in that the vacuum evacuation segment length of the double screw extruder is
10 times of the diameter of the twin-screw~18 times.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811534003.8A CN109435194B (en) | 2018-12-14 | 2018-12-14 | Be used for thermoplastic polyester foaming forming device |
| PCT/CN2019/082361 WO2020118987A1 (en) | 2018-12-14 | 2019-04-12 | Foam molding apparatus used for thermoplastic polyester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811534003.8A CN109435194B (en) | 2018-12-14 | 2018-12-14 | Be used for thermoplastic polyester foaming forming device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109435194A true CN109435194A (en) | 2019-03-08 |
| CN109435194B CN109435194B (en) | 2024-03-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811534003.8A Active CN109435194B (en) | 2018-12-14 | 2018-12-14 | Be used for thermoplastic polyester foaming forming device |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109435194B (en) |
| WO (1) | WO2020118987A1 (en) |
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| CN110435036A (en) * | 2019-08-16 | 2019-11-12 | 南通星辰合成材料有限公司 | The low volatilization of one kind, low precipitation polyester material and preparation method thereof |
| WO2020118987A1 (en) * | 2018-12-14 | 2020-06-18 | 北京化工大学 | Foam molding apparatus used for thermoplastic polyester |
| CN113232225A (en) * | 2021-06-11 | 2021-08-10 | 荆门市双创专利技术服务有限公司 | EPS cystosepiment production line |
| CN113951372A (en) * | 2021-10-12 | 2022-01-21 | 哈尔滨良粟农业科技有限公司 | Double-screw extrusion equipment for producing high-moisture pure pea protein artificial meat |
| CN114130303A (en) * | 2021-11-27 | 2022-03-04 | 南京创博机械设备有限公司 | TGIC high-efficiency devolatilization and melt extrusion granulation integrated processing method |
| CN114316425A (en) * | 2021-11-25 | 2022-04-12 | 南通荣荟新材料科技有限公司 | Plant-derived multifunctional master batch capable of being subjected to thermoplasticity processing and preparation method thereof |
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| CN110435036A (en) * | 2019-08-16 | 2019-11-12 | 南通星辰合成材料有限公司 | The low volatilization of one kind, low precipitation polyester material and preparation method thereof |
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| CN113951372A (en) * | 2021-10-12 | 2022-01-21 | 哈尔滨良粟农业科技有限公司 | Double-screw extrusion equipment for producing high-moisture pure pea protein artificial meat |
| CN113951372B (en) * | 2021-10-12 | 2023-12-22 | 哈尔滨良粟农业科技有限公司 | Double-screw extrusion equipment for producing high-moisture pure pea protein artificial meat |
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| CN114130303A (en) * | 2021-11-27 | 2022-03-04 | 南京创博机械设备有限公司 | TGIC high-efficiency devolatilization and melt extrusion granulation integrated processing method |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109435194B (en) | 2024-03-01 |
| WO2020118987A1 (en) | 2020-06-18 |
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