CN102825752A - Gas-assistant extrusion molding device - Google Patents

Gas-assistant extrusion molding device Download PDF

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Publication number
CN102825752A
CN102825752A CN2012102914484A CN201210291448A CN102825752A CN 102825752 A CN102825752 A CN 102825752A CN 2012102914484 A CN2012102914484 A CN 2012102914484A CN 201210291448 A CN201210291448 A CN 201210291448A CN 102825752 A CN102825752 A CN 102825752A
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CN
China
Prior art keywords
gas
auxilliary
extruding zone
extrusion
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.)
Pending
Application number
CN2012102914484A
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Chinese (zh)
Inventor
柳和生
黄兴元
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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 CN2012102914484A priority Critical patent/CN102825752A/en
Publication of CN102825752A publication Critical patent/CN102825752A/en
Pending legal-status Critical Current

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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
    • 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
    • B29C48/92—Measuring, controlling or regulating
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92514—Pressure
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/9258—Velocity
    • B29C2948/926—Flow or feed rate
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92704—Temperature
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92828—Raw material handling or dosing, e.g. active hopper or feeding device
    • 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
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92857—Extrusion unit
    • B29C2948/92904—Die; Nozzle zone

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)

Abstract

A gas-assistant extrusion molding device comprises an extruder, a gas control system and a gas-assistant extrusion molding die; during the extrusion molding process of polymer melt, a stable gas cushion film is formed between the inner wall of the extrusion die and the extruded melt, and thus the frictional resistance between the die wall surface and the extruded melt is reduced; therefore, the extrusion swelling phenomenon during the extrusion molding process is basically eliminated; the die pressure drop is reduced; and the surface quality problems of 'sharkskin', extrusion rupture phenomenon, and the like are prevented in the extrusion molding process.

Description

Gas is assisted extrusion molding apparatus
Technical field
Patent of the present invention belongs to polymer-extruded forming field; Make polymer melt in the extrusion molding process through a kind of gas control system and the auxiliary extrusion molding mouth mould of gas; Between extrusion neck ring mold inwall and melt extrusion, form stable air cushion rete, thereby reduce the frictional resistance of mouthful die side wall 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 are meant the phenomenon that the extrudate sectional dimension is bigger than extrusion neck ring mold size, and extrusion swelling has increased the extrusion neck ring mold design difficulty, influence the goods precision.2) the extrusion neck ring mold pressure drop is big, because the high viscosity of polymeric material needs very big mouth molding pressure to overcome the resistance of mouthful mould inwall to extrudate when extruding; Cause a mouthful mold pressing to fall greatly; Thereby make the extruded product internal stress increase, 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 phenomenon such as break, and the appearance of extrudate surface quality defect has limited the raising of extruded velocity, influences production efficiency.More than three problems all relevant to the resistance of melt extrusion with the mouth mould, it is crucial that resistance falls in the visbreaking between mouthful mould and the melt.
Summary of the invention
The objective of the invention is deficiency, provide a kind of gas to assist extrusion molding apparatus to prior art.Its technical scheme is through 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; Mouth mould extrusion is that the non-adhesion of a complete slippage mouthful mould is extruded by a traditional non-slippage adhesion mouthful mould extruder; Extrudate is piston-shaped to be extruded, thereby realization is eliminated extrusion swelling, reduced the purpose that the extrudate surface quality falls and improve in mouthful mold pressing.
The present invention includes: 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; The auxiliary extrusion neck ring mold of gas comprises head connecting plate, bolt, pressing plate, pressure-temperature sensor, mouthful mould overcoat, air inlet, screw, the auxilliary extruding zone of gas is arranged and do not have the auxilliary extruding zone of gas;
Air compressor machine connects the air accumulator inlet through valve; The air accumulator outlet is connected with valve, flowmeter, electromagnetic proportional valve, Pressure gauge, pressure sensor, temperature controller, gas heater and air inlet successively; The auxilliary extruding zone of no gas is connected by pressing plate, bolt and head connecting plate; Mouth mould overcoat is connected by screw and the auxilliary extruding zone of no gas; Have the auxilliary extruding zone of gas to be connected with a mouthful mould overcoat by screw, mouth mould overcoat is assisted extruding zone with no gas, is had the auxilliary extruding zone of gas to form air chamber, and no gas is assisted extruding zone and had between the auxilliary extruding zone of gas has the air inlet slit.
Technological merit of the present invention is: realize between mouth mould inwall and polymer melt, forming in the extrusion air cushion rete through gas control system and the auxiliary extrusion neck ring mold of gas; Thereby make mouthful mould inwall drop to bottom line, realize that work that resistance falls in visbreaking is in order to solve " sharkskin " in the big 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 the frictional resistance of melt extrusion.
Description of drawings
Accompanying drawing 1 is the auxiliary extrusion molding apparatus sketch of gas;
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 the auxiliary extrusion molding mouth mould enlarged drawing of gas;
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 auxilliary mouthful of mould section of gas, 24 air chambers, 25 screws, 26 air inlet slits, auxilliary mouthful of mould section of 27 no gas.
The specific embodiment
Device of the present invention comprises that extruder, gas control system and gas assists 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; The auxiliary extrusion neck ring mold of gas comprises head connecting plate, bolt, pressing plate, pressure-temperature sensor, mouthful mould overcoat, air inlet, screw, the auxilliary extruding zone of gas is arranged and do not have the auxilliary extruding zone of gas;
Air compressor machine connects the air accumulator inlet through valve; The air accumulator outlet is connected with valve, flowmeter, electromagnetic proportional valve, Pressure gauge, pressure sensor, temperature controller, gas heater and air inlet successively; The auxilliary extruding zone of no gas is connected by pressing plate, bolt and head connecting plate; Mouth mould overcoat is connected by screw and the auxilliary extruding zone of no gas; Have the auxilliary extruding zone of gas to be connected with a mouthful mould overcoat by screw, mouth mould overcoat is assisted extruding zone with no gas, is had the auxilliary extruding zone of gas to form air chamber, and no gas is assisted extruding zone and had between the auxilliary extruding zone of gas has the air inlet slit.
?

Claims (1)

1. a gas is assisted extrusion molding apparatus, and it is characterized in that said 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; The auxiliary extrusion neck ring mold of gas comprises head connecting plate, bolt, pressing plate, pressure-temperature sensor, mouthful mould overcoat, air inlet, screw, the auxilliary extruding zone of gas is arranged and do not have the auxilliary extruding zone of gas;
Air compressor machine connects the air accumulator inlet through valve; The air accumulator outlet is connected with valve, flowmeter, electromagnetic proportional valve, Pressure gauge, pressure sensor, temperature controller, gas heater and air inlet successively; The auxilliary extruding zone of no gas is connected by pressing plate, bolt and head connecting plate; Mouth mould overcoat is connected by screw and the auxilliary extruding zone of no gas; Have the auxilliary extruding zone of gas to be connected with a mouthful mould overcoat by screw, mouth mould overcoat is assisted extruding zone with no gas, is had the auxilliary extruding zone of gas to form air chamber, and no gas is assisted extruding zone and had between the auxilliary extruding zone of gas has the air inlet slit.
CN2012102914484A 2012-08-16 2012-08-16 Gas-assistant extrusion molding device Pending CN102825752A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012102914484A CN102825752A (en) 2012-08-16 2012-08-16 Gas-assistant extrusion molding device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2012102914484A CN102825752A (en) 2012-08-16 2012-08-16 Gas-assistant extrusion molding device

Publications (1)

Publication Number Publication Date
CN102825752A true CN102825752A (en) 2012-12-19

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Family Applications (1)

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Country Status (1)

Country Link
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103496135A (en) * 2013-09-30 2014-01-08 昆山市华浦塑业有限公司 Gas-assisted extrusion equipment with stirring and pushing functions
CN103496145A (en) * 2013-09-30 2014-01-08 昆山市华浦塑业有限公司 Gas-assisted extrusion equipment
CN103496137A (en) * 2013-09-30 2014-01-08 昆山市华浦塑业有限公司 Gas assisted extrusion device with feed inlet stirring function
CN103507259A (en) * 2013-09-21 2014-01-15 北京化工大学 Efficient large pipe-extrusion forming device
CN104943122A (en) * 2015-05-04 2015-09-30 柳和生 Gas-assisted mouth die assembly
CN105235220A (en) * 2015-11-16 2016-01-13 南昌航空大学 Gas-aid extrusion head of fused deposition modeling (FDM) 3D printer

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0988956A1 (en) * 1998-09-25 2000-03-29 Sumitomo Chemical Company, Limited Blow molding die and process for producing blown film
CN2871170Y (en) * 2006-02-20 2007-02-21 四川大学 Extruding plate former of air-aid lubricating superhigh viscosity polymer
CN101003174A (en) * 2006-12-28 2007-07-25 中北大学 Forming machine for extruding assistant high molecular material in supercritical fluid

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0988956A1 (en) * 1998-09-25 2000-03-29 Sumitomo Chemical Company, Limited Blow molding die and process for producing blown film
CN2871170Y (en) * 2006-02-20 2007-02-21 四川大学 Extruding plate former of air-aid lubricating superhigh viscosity polymer
CN101003174A (en) * 2006-12-28 2007-07-25 中北大学 Forming machine for extruding assistant high molecular material in supercritical fluid

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
柳和生,卢 臣,黄兴元: "塑料异型材气辅挤出成型实验", 《高分子材料科学与工程》, vol. 26, no. 7, 15 July 2010 (2010-07-15), pages 93 - 96 *
黄兴元,柳和生,周国发,罗忠民,李绅元: "气辅挤出过程中挤出胀大的实验和模拟研究", 《塑 料》, vol. 34, no. 6, 18 December 2005 (2005-12-18), pages 55 - 59 *

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103507259A (en) * 2013-09-21 2014-01-15 北京化工大学 Efficient large pipe-extrusion forming device
CN103507259B (en) * 2013-09-21 2015-06-17 北京化工大学 Efficient large pipe-extrusion forming device
CN103496135A (en) * 2013-09-30 2014-01-08 昆山市华浦塑业有限公司 Gas-assisted extrusion equipment with stirring and pushing functions
CN103496145A (en) * 2013-09-30 2014-01-08 昆山市华浦塑业有限公司 Gas-assisted extrusion equipment
CN103496137A (en) * 2013-09-30 2014-01-08 昆山市华浦塑业有限公司 Gas assisted extrusion device with feed inlet stirring function
CN104943122A (en) * 2015-05-04 2015-09-30 柳和生 Gas-assisted mouth die assembly
CN104943122B (en) * 2015-05-04 2017-01-04 柳和生 Gas auxiliary mouth die assembly
CN105235220A (en) * 2015-11-16 2016-01-13 南昌航空大学 Gas-aid extrusion head of fused deposition modeling (FDM) 3D printer

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Application publication date: 20121219