WO2021027071A1 - Procédé de fabrication d'un tuyau en pvc étiré biaxialement - Google Patents

Procédé de fabrication d'un tuyau en pvc étiré biaxialement Download PDF

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Publication number
WO2021027071A1
WO2021027071A1 PCT/CN2019/113633 CN2019113633W WO2021027071A1 WO 2021027071 A1 WO2021027071 A1 WO 2021027071A1 CN 2019113633 W CN2019113633 W CN 2019113633W WO 2021027071 A1 WO2021027071 A1 WO 2021027071A1
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WO
WIPO (PCT)
Prior art keywords
expansion
tube
pipe
biaxially stretched
blowing
Prior art date
Application number
PCT/CN2019/113633
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English (en)
Chinese (zh)
Inventor
何志才
陈卫
黄剑
陈智勇
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永高股份有限公司
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Publication date
Application filed by 永高股份有限公司 filed Critical 永高股份有限公司
Publication of WO2021027071A1 publication Critical patent/WO2021027071A1/fr

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    • 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
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/22—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes
    • B29C55/26—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of tubes biaxial

Definitions

  • the invention relates to the technical field of polymer materials, in particular to a method for preparing biaxially stretched PVC pipes.
  • PVC pipe Due to its high modulus, high strength and low price, PVC pipe is the most widely used plastic piping system in the world, and it has been widely used in many areas of modern society. my country's plastic pipe industry has developed rapidly and has become one of the world's largest countries in the production and application of plastic pipes.
  • PVC pipes also have some shortcomings: poor high temperature resistance, easy to deform when working in a hot environment, not suitable for hot water pipes; low toughness and strength, and poor resistance to cracking and impact.
  • Biaxially oriented polyvinyl chloride (PVC-O) pipes are pipes manufactured through a special orientation process. This process is to stretch the PVC-U pipes produced by extrusion methods in axial and radial directions.
  • the long-chain PVC molecules in the pipe are arranged biaxially to obtain a new type of PVC pipe with high strength, high toughness, high impact resistance and fatigue resistance, which is far better than ordinary PVC-U pipes.
  • the research and development of PVC-O pipes can greatly save raw material resources, reduce costs, improve product performance, and have obvious economic and social benefits.
  • the present invention proposes a method for preparing biaxially stretched PVC pipes.
  • the technical solution adopted by the present invention to solve its technical problems is: a method for preparing biaxially stretched PVC pipes, including blowing pipe, blowing pipe positioning and reciprocating device, heating device, expansion setting device, cooling device and traction device.
  • the traction device includes a first traction device and a second traction device, the end of the blowing tube is fixed with an expansion cloth tube, one end of the blowing tube is connected with the extruder head, and the blowing tube is fixed by the blowing tube positioning and reciprocating device And realize the reciprocating movement within a certain range;
  • the specific production process is: the extruder produces thick-walled tube blanks, after cooling and shaping, the first traction device performs the first axial stretching, and the heating device will pass through the The first-time axially stretched tube is heated to 110-150°C, the expansion and setting device expands and sets the heated tube, and the cooling device cools the expanded tube for 15-30 seconds.
  • the cooled billet enters the second traction device.
  • the blowing tube positioning and reciprocating device includes a blowing tube support, a spring fixed end and a spring.
  • the speed ratio of the first traction device and the second traction device is 1.1 to 3.
  • the expansion and shaping device includes an air cylinder, a fixed template, a guide rod, a movable template, and a stereotype mold.
  • the stereotype mold is fixedly installed on one side of the movable template. The other side is fixedly connected with the cylinder piston, the cylinder is fixedly installed on the fixed template, the guide rod penetrates the movable template and the fixed template, and the expansion and setting device can realize linear reciprocating motion.
  • the shaping die is respectively provided with an expansion section, a transition section and a shaping section along the movement direction of the tube blank, and the length ratio of the expansion section, the transition section and the shaping section is 2: 1:2, the temperature of the expansion section is set to 130-135°C, the temperature of the transition section is set to 110-120°C, and the temperature of the shaping section is set to 80-95°C.
  • the working process of the expansion setting device is: after the tube blank reaches the expansion setting device, the setting mold is closed while the pipe is expanded and inflated, and the expansion pressure is maintained after the expansion pipe is full. At the same time, the expansion tube and the shaping mold move forward synchronously with the tube blank. After reaching a certain position, the expansion tube deflates and the shaping mold opens. The expansion tube and shaping mold quickly return to the starting position at the same time, and the expansion process is repeated.
  • the expansion pressure of the expansion setting device is 0.2-0.5 MPa when it is working.
  • the beneficial effect of the present invention is that the method for preparing biaxially stretched PVC pipes provided by the present invention effectively solves the problem of molecular chain de-orientation at the pipe joints during segmented expansion, and ensures the overall performance of the biaxially stretched PVC pipes.
  • the invention realizes the continuous operation of the biaxial stretching tube, has simple structure, precise control, easy to realize industrialization, saves energy consumption, and reduces production costs; the invention has simple operation, low processing cost, raw material saving, and uniform thickness of the prepared tube , The overall performance is uniform.
  • Figure 1 is a schematic diagram of the production process of the present invention
  • Fig. 2 is a schematic diagram of the expansion setting device along the direction A in Fig. 1;
  • Figure 3 is a sectional view of the shaping mold
  • Figure 4 is a schematic diagram of the continuous working cycle of the expansion pipe.
  • a method for preparing a biaxially stretched PVC pipe including a blowing tube 1, a blowing tube positioning and reciprocating device, a heating device 6, an expansion setting device 8, a cooling device 9, and a traction device, the traction device including a first traction device 5 And the second traction device 10, the end of the blowing tube 1 is fixed with an expanding cloth tube 7, one end of the blowing tube 1 is connected with the extruder head, the blowing tube 1 is fixed by the blowing tube positioning and reciprocating device and fixed at a certain The reciprocating movement is realized within the range; the specific production process is: the extruder produces the thick-walled tube 20.
  • the first traction device 5 After cooling and shaping, the first traction device 5 performs the first axial stretching, and the heating device 6 passes through the The primary axially stretched tube 20 is heated to 110-150°C, the expansion and setting device 8 expands and sets the heated tube 20, and the cooling device 9 cools the expanded tube 20 15 In ⁇ 30s, the cooled tube blank 20 enters the second traction device 10.
  • blowing tube positioning and reciprocating device includes a blowing tube support 2, a spring fixed end 3, and a spring 4.
  • the speed ratio of the first traction device 5 and the second traction device 10 is 1.1-3.
  • the expansion setting device 8 includes an air cylinder 11, a fixed template 12, a guide rod 13, a movable template 14, and a setting mold 15.
  • the setting mold 15 is fixedly installed on one side of the movable template 14 and the other of the movable template 14 The side is fixedly connected with the cylinder piston 16, the cylinder 11 is fixedly installed on the fixed template 12, the guide rod 13 penetrates the movable template 14 and the fixed template 12, and the expansion and setting device 8 can realize linear reciprocating motion.
  • the shaping die 15 is respectively provided with an expansion section 17, a transition section 18 and a shaping section 19 along the movement direction of the tube blank 20.
  • the length ratio of the expansion section 17, the transition section 18 and the shaping section 19 is 2:1:2.
  • the temperature of the expansion section 17 is set to 130-135°C
  • the temperature of the transition section 18 is set to 110-120°C
  • the temperature of the shaping section 19 is set to 80-95°C.
  • the working process of the expansion setting device 8 is: after the tube blank 20 reaches the expansion setting device 8, the setting mold 15 is closed while the expanded cloth tube 7 is inflated. After the expanded cloth tube 7 is full, the expansion pressure is maintained while expanding the cloth tube 7 Synchronously move forward with the shaping mold 15 along with the tube blank 20. After reaching a certain position, the expanded cloth tube 7 is deflated and the shaping mold 15 is opened. The expanded cloth tube 7 and the shaping mold 15 quickly return to the starting position at the same time, and the expansion is repeated. process.
  • the expansion pressure of the expansion setting device 8 is 0.2-0.5 MPa when working.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un tuyau en PVC étiré biaxialement, comprenant un tuyau de soufflage d'air (1), un dispositif de positionnement et de va-et-vient de tuyau de soufflage d'air, un dispositif de chauffage (6), un dispositif de mise en forme d'expansion (8), un dispositif de refroidissement (9) et un dispositif de traction. Le dispositif de traction comprend un premier moyen de traction (5) et un second moyen de traction (10). Un pipeline d'expansion (7) est fixé sur l'extrémité arrière du tuyau de soufflage d'air (1). Une extrémité du tuyau de soufflage d'air (1) est reliée à une tête d'extrudeuse. Le tuyau de soufflage d'air (1) est fixé par le dispositif de positionnement et de va-et-vient de tuyau de soufflage d'air et effectue un mouvement de va-et-vient dans une certaine plage. Le procédé de production spécifique comprend les étapes suivantes consistant : à produire, par une extrudeuse, une ébauche de tuyau à paroi épaisse (20) ; après refroidissement et mise en forme de l'ébauche de tuyau (20), à réaliser, sur l'ébauche de tuyau (20), le premier étirement axial par le premier moyen de traction (5) ; à chauffer, par le dispositif de chauffage (6), l'ébauche de tuyau (20) ayant subi le premier étirement axial à 110 à 150 °C ; à réaliser, par le dispositif de mise en forme d'expansion (8), une mise en forme d'expansion sur l'ébauche de tuyau (20) ayant subi le chauffage ; à refroidir, par le dispositif de refroidissement (9), l'ébauche de tuyau (20) ayant subi l'expansion pendant 15 à 30 s ; à faire entrer l'ébauche de tuyau refroidie (20) dans le second moyen de traction (10). Le procédé de fabrication présente un coût de traitement faible, et le tuyau fabriqué présente une épaisseur uniforme et une performance globale uniforme.
PCT/CN2019/113633 2019-08-13 2019-10-28 Procédé de fabrication d'un tuyau en pvc étiré biaxialement WO2021027071A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201910746586.9 2019-08-13
CN201910746586.9A CN110341173A (zh) 2019-08-13 2019-08-13 一种双轴拉伸pvc管材的制备方法

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WO2021027071A1 true WO2021027071A1 (fr) 2021-02-18

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110341173A (zh) * 2019-08-13 2019-10-18 永高股份有限公司 一种双轴拉伸pvc管材的制备方法
CN115195073A (zh) * 2022-07-12 2022-10-18 浙江海正生物材料股份有限公司 一种聚乳酸吸管及其制备方法

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JPH09309138A (ja) * 1996-05-23 1997-12-02 Teijin Ltd 押出成形ダイ及びそのリップ開度の測定方法
US20020180116A1 (en) * 2001-06-04 2002-12-05 Weeks Bruce V. Method and apparatus for progressively separating integrally attached gutter flash from an in-mold blow-molded thermoplastic resin product
EP2133618A1 (fr) * 2007-03-22 2009-12-16 Alexzander Gebekovich Abuev Procede de restauration de canalisation et canalisation associee
CN103395183A (zh) * 2013-07-26 2013-11-20 鹤山市塑协塑料加工技术研究所有限公司 一种双轴取向pvc及聚烯烃材料管材的制造设备及其生产工艺和方法
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