CN202781768U - Gas-assisted extrusion molding device - Google Patents

Gas-assisted extrusion molding device Download PDF

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Publication number
CN202781768U
CN202781768U CN2012204081786U CN201220408178U CN202781768U CN 202781768 U CN202781768 U CN 202781768U CN 2012204081786 U CN2012204081786 U CN 2012204081786U CN 201220408178 U CN201220408178 U CN 201220408178U CN 202781768 U CN202781768 U CN 202781768U
Authority
CN
China
Prior art keywords
gas
extruding zone
air
auxiliary extruding
valve
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.)
Expired - Fee Related
Application number
CN2012204081786U
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Chinese (zh)
Inventor
柳和生
黄兴元
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nanchang University
Original Assignee
Nanchang University
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nanchang University filed Critical Nanchang University
Priority to CN2012204081786U priority Critical patent/CN202781768U/en
Application granted granted Critical
Publication of CN202781768U publication Critical patent/CN202781768U/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B29C48/395Means 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

Abstract

The utility model discloses a gas-assisted extrusion molding device. The device comprises an extruder, a gas control system and a gas-assisted extrusion molding die. During the extrusion molding process, and a polymer melt forms a stable gas cushion film layer between the inner wall of the extrusion die and an extruded melt, so that frictional resistance of the wall surface of the die for the extruded melt is reduced, the swelling phenomenon in the extrusion molding process can be eliminated basically, the pressure drop of the die is reduced, and the surface quality problem which is caused by a 'sharkskin' phenomenon and an extrusion fracture phenomenon during the extrusion molding process is avoided.

Description

A kind of gas-assisted extrusion device
Technical field
The utility model patent belongs to polymer-extruded forming field, make polymer melt in the extrusion molding process by a kind of gas control system and gas-assisted extrusion mouth mould, between extrusion neck ring mold inwall and melt extrusion, form stable air cushion rete, thereby reduce mouthful die side wall to the frictional resistance of melt extrusion.
Background technology
Advantage becomes one of Polymer Processing basic forming method already because its variations is many, purposes is wide, production efficiency is high, small investment, production are continuous etc. in extrusion molding, polymer product about 40% is by extruding machine-shaping, and extrusion molding plays a part very important in Polymer Processing.But there is following problem in traditional extrusion molding: 1) extrusion swelling, extrusion swelling refer to the phenomenon that the extrudate sectional dimension is larger than extrusion neck ring mold size, and extrusion swelling has increased the extrusion neck ring mold design difficulty, affect the goods precision.2) the extrusion neck ring mold pressure drop is large, because the high viscosity of polymeric material needs very large mouth molding pressure to overcome mouthful mould inwall to the resistance of extrudate when extruding, cause pressure drop of die large, thereby so that the extruded product internal stress increases, cause distortion to increase, also increased energy consumption simultaneously.3) extrudate surface quality defect, when extruded velocity surpassed a certain limit, the extrudate surface " sharkskin " occurred and extrudes the phenomenon such as break, and the appearance of extrudate surface quality defect has limited the raising of extruded velocity, affects production efficiency.More than three problems all relevant to the resistance of melt extrusion with the mouth mould, the reducing adhesion resistance between mouthful mould and the melt is crucial.
Summary of the invention
The purpose of this utility model is for the deficiencies in the prior art, and a kind of gas-assisted extrusion device is provided.Its technical scheme is by form stable air cushion rete at the mouth die side wall, the mouth die side wall drops to bottom line to the frictional resistance of extruding the homogeneous phase body, the die extrusion process is the non-adhesion die extrusion of complete slippage by traditional non-slippage adhesion die extrusion machine, extrudate is piston-shaped to be extruded, thereby realize to eliminate extrusion swelling, reduces pressure drop of die and improve the purpose of extrudate surface quality.
The utility model comprises: extruder, gas control system and gas are assisted extrusion neck ring mold three parts; Extruder comprises power section, feed hopper, screw rod, heater; Gas control system comprises air compressor machine, air accumulator, valve, flowmeter, electromagnetic proportional valve, D/A transition card, Pressure gauge, computer, pressure servo valve, pressure sensor, A/D transition card, temperature controller, gas heater; Air-Assisted Extrusion of Polymer mouth mould comprises head connecting plate, bolt, pressing plate, pressure-temperature sensor, mouthful mould overcoat, air inlet, screw, the auxiliary extruding zone of gas is arranged and without the auxiliary extruding zone of gas;
Air compressor machine connects the air accumulator entrance through valve, the air accumulator outlet is connected with air inlet with valve, flowmeter, electromagnetic proportional valve, Pressure gauge, pressure sensor, temperature controller, gas heater and is connected, be connected by pressing plate, bolt and head connecting plate without the auxiliary extruding zone of gas, mouthful mould overcoat by screw with connect without the auxiliary extruding zone of gas, have the auxiliary extruding zone of gas by screw be connected the mould overcoat and connect, mouthful mould overcoat and without the auxiliary extruding zone of gas, have the auxiliary extruding zone of gas to form air chamber, without the auxiliary extruding zone of gas with have between the auxiliary extruding zone of gas the air inlet slit is arranged.
Technological merit of the present utility model is: realize forming in the extrusion air cushion rete by gas control system and the auxiliary extrusion neck ring mold of gas between mouth mould inwall and polymer melt, thereby make mouthful mould inwall drop to bottom line to the frictional resistance of melt extrusion, the work of realizing the reducing adhesion resistance is in order to solve " sharkskin " in the large and extrusion of the extrusion swelling phenomenon, the extrusion neck ring mold pressure drop that produce in the polymer-extruded process and to extrude the problem of surface quality defects such as breaking.
Description of drawings
Accompanying drawing 1 is gas-assisted extrusion device sketch;
Among the figure: 1 air compressor machine, 2 valves, 3 air accumulators, 4 feed hoppers, 5 valves, 6 flowmeters, 7 electromagnetic proportional valves, 8A/D transition card, 9 Pressure gauges, 10 computers, 11 pressure servo valves, 12 pressure sensors, 13 D/A transition cards, 14 temperature controllers, 15 gas heaters, 28 heaters, 29 screw rods, 30 power sections.
Fig. 2 is gas-assisted extrusion mouth mould enlarged drawing;
Among the figure: 16 head connecting plates, 17 pressing plates, 18 bolts, 19 temperature sensors, 20 mouthfuls of mould overcoats, 21 air inlets, 22 screws, 23 have auxiliary mouthful of mould section of gas, 24 air chambers, 25 screws, 26 air inlet slits, 27 without auxiliary mouthful of mould section of gas.
The specific embodiment
The utility model comprises: extruder, gas control system and gas are assisted extrusion neck ring mold three parts; Extruder comprises power section, feed hopper, screw rod, heater; Gas control system comprises air compressor machine, air accumulator, valve, flowmeter, electromagnetic proportional valve, D/A transition card, Pressure gauge, computer, pressure servo valve, pressure sensor, A/D transition card, temperature controller, gas heater; Air-Assisted Extrusion of Polymer mouth mould comprises head connecting plate, bolt, pressing plate, pressure-temperature sensor, mouthful mould overcoat, air inlet, screw, the auxiliary extruding zone of gas is arranged and without the auxiliary extruding zone of gas;
Air compressor machine connects the air accumulator entrance through valve, the air accumulator outlet is connected with air inlet with valve, flowmeter, electromagnetic proportional valve, Pressure gauge, pressure sensor, temperature controller, gas heater and is connected, be connected by pressing plate, bolt and head connecting plate without the auxiliary extruding zone of gas, mouthful mould overcoat by screw with connect without the auxiliary extruding zone of gas, have the auxiliary extruding zone of gas by screw be connected the mould overcoat and connect, mouthful mould overcoat and without the auxiliary extruding zone of gas, have the auxiliary extruding zone of gas to form air chamber, without the auxiliary extruding zone of gas with have between the auxiliary extruding zone of gas the air inlet slit is arranged.

Claims (1)

1. a gas-assisted extrusion device is characterized in that, described device comprises: extruder, gas control system and gas are assisted extrusion neck ring mold three parts; Extruder comprises power section, feed hopper, screw rod, heater; Gas control system comprises air compressor machine, air accumulator, valve, flowmeter, electromagnetic proportional valve, D/A transition card, Pressure gauge, computer, pressure servo valve, pressure sensor, A/D transition card, temperature controller, gas heater; Air-Assisted Extrusion of Polymer mouth mould comprises head connecting plate, bolt, pressing plate, pressure-temperature sensor, mouthful mould overcoat, air inlet, screw, the auxiliary extruding zone of gas is arranged and without the auxiliary extruding zone of gas;
Air compressor machine connects the air accumulator entrance through valve, the air accumulator outlet is connected with air inlet with valve, flowmeter, electromagnetic proportional valve, Pressure gauge, pressure sensor, temperature controller, gas heater and is connected, be connected by pressing plate, bolt and head connecting plate without the auxiliary extruding zone of gas, mouthful mould overcoat by screw with connect without the auxiliary extruding zone of gas, have the auxiliary extruding zone of gas by screw be connected the mould overcoat and connect, mouthful mould overcoat and without the auxiliary extruding zone of gas, have the auxiliary extruding zone of gas to form air chamber, without the auxiliary extruding zone of gas with have between the auxiliary extruding zone of gas the air inlet slit is arranged.
CN2012204081786U 2012-08-17 2012-08-17 Gas-assisted extrusion molding device Expired - Fee Related CN202781768U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012204081786U CN202781768U (en) 2012-08-17 2012-08-17 Gas-assisted extrusion molding device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012204081786U CN202781768U (en) 2012-08-17 2012-08-17 Gas-assisted extrusion molding device

Publications (1)

Publication Number Publication Date
CN202781768U true CN202781768U (en) 2013-03-13

Family

ID=47809097

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2012204081786U Expired - Fee Related CN202781768U (en) 2012-08-17 2012-08-17 Gas-assisted extrusion molding device

Country Status (1)

Country Link
CN (1) CN202781768U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111844686A (en) * 2020-07-21 2020-10-30 四川大学 Ultrahigh molecular weight polyethylene plasticizing extrusion device and extrusion method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111844686A (en) * 2020-07-21 2020-10-30 四川大学 Ultrahigh molecular weight polyethylene plasticizing extrusion device and extrusion method

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C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130313

Termination date: 20130817