CN103358423A - Method for producing orientation polyvinyl chloride pipe by two steps - Google Patents
Method for producing orientation polyvinyl chloride pipe by two steps Download PDFInfo
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- CN103358423A CN103358423A CN2013103180868A CN201310318086A CN103358423A CN 103358423 A CN103358423 A CN 103358423A CN 2013103180868 A CN2013103180868 A CN 2013103180868A CN 201310318086 A CN201310318086 A CN 201310318086A CN 103358423 A CN103358423 A CN 103358423A
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- polyvinyl chloride
- polychloroethylene pipes
- orientation
- chloride pipe
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Abstract
A provided method for producing an orientation polyvinyl chloride pipe by a two steps comprises: fully stirring and mixing raw materials comprising a polyvinyl chloride resin, an additive and the like, performing extrusion, cooling and traction to form the polyvinyl chloride pipe; and conveying the qualified polyvinyl chloride pipe into an orientation forming apparatus, adding a fluid medium with a certain temperature and pressure into the polyvinyl chloride pipe to make the polyvinyl chloride pipe have radial-direction stretching and axial-direction stretching, and cooling to form the biaxial orientation polyvinyl chloride pipe. The two-step method helps to realize one-shot forming of a connecting bellmouth and the orientation polyvinyl chloride pipe while the performance of the pipe are guaranteed; the method helps to improve production efficient and reduce defective rate; and the prepared orientation polyvinyl chloride pipe is higher in strength, better in toughness, stronger in impact resistance and fatigue resistance.
Description
Technical field
The present invention relates to a kind of production method of tubing, particularly a kind of production method that is orientated polychloroethylene pipes.
Background technology
The development of polychloroethylene pipes has nearly 70 years history, and its significant advantage is that intensity is high, and price is low, and therefore the application quantity in plastic duct system is very large, and it is general to be of wide application.But because its fragility is large, toughness is low, and anti-cracking performance is poor, special and adverse circumstances such as water supply system, mine at some, and non-excavation laying and pipe-repairing etc. can not well be used.
The orientation polychloroethylene pipes is processed by biaxial orientation, polyvinyl chloride long-chain molecule ordered arrangement, and material is anisotropy by isotropic transition, and material is increased greatly along the intensity of molecular orientation direction, has improved the intensity of tubing; The processing of polyvinyl chloride long-chain molecule orientation produces the thin slice hierarchy, has effectively suppressed the Crack Extension of tubing, has improved greatly the toughness of tubing.Because tubing is radially reaching axial stretching, has reduced the wall thickness of tubing, has saved raw material, has reduced the cost of product.This economical with materials, the ep-type material that shock resistance and anti-fatigue performance are high meets the strategy of sustainable development under being becoming tight environment in resource day.
The preparation of traditional orientation polychloroethylene pipes needs minute three steps to carry out at least: extrusion molding, axial tension is orientated and radially dilates orientation, wherein axial tension orientation with radially dilate orientation and need in different orientation processing unit (plant)s, carry out respectively, and the processing that radially dilates orientation often needs to by expansion body and sizing sleeve device.This traditional processing method processing step trouble, efficient is low, and produces complexity, and maintenance cost is high.And another uses in the tradition directed polychloroethylene pipes production method of mode with tubing radial dilatation and axial tension of die head traction, machinery die head mode of traction meeting so that during tube forming wall unevenness spare, and because die head is fixed dimension, radial dilatation speed is too fast and non-adjustable, producing stress during tube forming concentrates, intensity is difficult to guarantee that constant product quality is poor that percent defective is higher.In addition, traditional approach tubing and bellmouth can not one-shot formings, need process bellmouth at pipe-expanding machine, increase technological process, and the product percent defective is high.
Summary of the invention
Produce the defective of orientation polychloroethylene pipes technique for overcoming traditional three-step approach, the applicant is through studying for a long period of time, found in axial tension in pipe, to pass to the fluid media (medium) of specified temp and pressure, can realize the axial tension orientation and radially dilate finishing synchronously of orientation, effectively reduce processing step, improved production efficiency.
Therefore, the object of the present invention is to provide a kind of two-step method to produce the method for orientation polychloroethylene pipes, it comprises first step extrusion molding and second step expansion molding, wherein:
First step extrusion molding comprises step: the raw material that (1) will comprise Corvic, additive fully stirs and mixes, and obtains compound; (2) above-mentioned compound is delivered to the extruder production line, through extrude, cooling and shaping and traction moulding form polychloroethylene pipes; (3) cut above-mentioned polychloroethylene pipes, it is for subsequent use that qualified polychloroethylene pipes is got in check;
The second step expansion molding comprises step: (4) are got above-mentioned qualified polychloroethylene pipes and are delivered in the oriontation shaping device, pass into the fluid media (medium) of high temperature and high pressure in the polychloroethylene pipes, polychloroethylene pipes is produced radially to be dilated, axial tension device two ends are mobile round about, make polychloroethylene pipes produce axial tension; (5) be biaxially orienting polyvinyl chloride tubing through cooling and shaping.
Further, the Agitation and mixing of described raw material carries out in high-speed mixer and low speed cold mixer.
Further, the temperature of used fluid media (medium) is preferably 80～110 ℃, and pressure is preferably 1.3～1.8MPa.Temperature or hypotony, then deficiency radially dilates effect so that polyvinyl chloride pipe produces, and temperature or hypertonia can cause the energy resource consumption rate to increase on the one hand, also may destroy the polyvinyl chloride pipe molecular chain structure on the other hand, make on the contrary performance become bad.Polychloroethylene pipes is preferred rate of extension 3～5mm/s when axial tension.From convenience and cost consideration, fluid media (medium) of the present invention can be water or air, for example common clean water.Further, the described processing time that radially dilates with axial tension is preferably 10-30 minute.In addition, when radially dilating, preferably use radially shaping equipment.
Further,, to being that biaxially orienting polyvinyl chloride tubing is tested through cooling and shaping qualified orientation polychloroethylene pipes is put in storage by standard-required.
The present invention has initiated two-step method and has produced the forming manufacture technique that is orientated polychloroethylene pipes, and solved orientation polychloroethylene pipes and the one-time formed problem of bellmouth, and further reduced tube wall thickness, improve conveyance power of water, conservation reduces carrying and lays cost.The energy-conserving and environment-protective of prepared orientation polychloroethylene pipes meet the strategy of sustainable development.
And traditional polychloroethylene pipes moves to fuse machine after the terminal fixed length cutting of extruding production line, and first hot melt female end makes it softening, moves to pipe-expanding machine again bellmouth is carried out expanding.So not only increase production process, reduce operating efficiency, and it is concentrated to produce stress at socket, reduces bellmouth intensity, also increases energy resource consumption, the heat when not taking full advantage of tube extrusion is directly processed bellmouth, makes its one-shot forming;
And in traditional three-step production process, because axial tension and radially dilate substep and carry out requires height to the linking conformability between each technique, constant product quality is poor, and is limited to the raising degree of tubing intensity.And in the two-step method of the present invention, axial tension and radially dilating carries out simultaneously, the biaxial orientation better effects if, and polychloroethylene pipes intensity is higher, and toughness is stronger, shock resistance and anti-fatigue performance strengthen.
Description of drawings
Fig. 1 process flow diagram of the present invention
The specific embodiment
Embodiment 1:
1) get the raw materials ready by weight:
2) batch mixing: above-mentioned getting the raw materials ready put into high-speed mixer and mixed, put into again the low speed cold mixer and fully stir, mix;
3) extrude: above-mentioned batch mixing is delivered to extruder, through Screw Extrusion to calibration sleeve, footpath mould moulding polychloroethylene pipes;
4) cooling and shaping: above-mentioned polychloroethylene pipes is cooling and shaping in the vacuum cooled shaping equipment;
5) traction, cutting: involve the moulding polychloroethylene pipes by hauling machine, cut by length 4m or 6m through cutting machine;
6) check: by company standard requirement check, it is for subsequent use to get qualified tubing;
7) HTHP moulding: above-mentioned qualified polychloroethylene pipes is put into oriontation shaping device (band bellmouth), passing into temperature in the tubing and be 90 ℃, pressure is the clean water of 1.5MPa, axial tension device in the oriontation shaping device moves to two ends, make tubing produce axial tension, polychloroethylene pipes dilates to shaping equipment radially, the HTHP clean water is pressed the operation of the direction of arrow shown in Fig. 1 20 minutes, with the orientation polyvinyl chloride pipe material forming of bellmouth;
8) cooling and shaping: passing into temperature in the above-mentioned shaping pipe and be 10 ℃～20 ℃, pressure is the clean water of 1.3MPa～1.5MPa, by direction of arrow operation shown in Figure 1 20 minutes, tubing cooling and shaping;
9) check; By company standard requirement check, get qualified orientation polychloroethylene pipes warehouse-in.
Embodiment 2:
According to batching and the method for embodiment 1, difference only is that serviceability temperature is that 80 ℃, pressure are that the HTHP clean water of 1.4Mpa was by the operation of the direction of arrow shown in Fig. 1 25 minutes.
Embodiment 3:
According to batching and the method for embodiment 1, difference only is that serviceability temperature is that 95 ℃, pressure are that the HTHP clean water of 1.6Mpa was by the operation of the direction of arrow shown in Fig. 1 18 minutes.
Embodiment 4:
According to batching and the method for embodiment 1, difference only is that serviceability temperature is that 100 ℃, pressure are that the HTHP clean water of 1.7Mpa was by the operation of the direction of arrow shown in Fig. 1 12 minutes.
Embodiment 5:
According to batching and the method for embodiment 1, difference only is that serviceability temperature is that 90 ℃, pressure are that the HTHP clean water of 1.8Mpa was by the operation of the direction of arrow shown in Fig. 1 15 minutes.
The Performance Ratio that table 1 has provided the standby polychloroethylene pipes of prepared according to the methods of the invention orientation polychloroethylene pipes and traditional die head traction legal system can be found out, and the orientation polychloroethylene pipes that the inventive method prepares has more excellent intensity.
Table 1 orientation polychloroethylene pipes and polychloroethylene pipes intensity contrast
Claims (7)
1. a two-step method is produced the method that is orientated polychloroethylene pipes, and it comprises first step extrusion molding and second step expansion molding, wherein:
First step extrusion molding comprises step: the raw material that (1) will comprise Corvic, additive fully stirs and mixes, and obtains compound; (2) above-mentioned compound is delivered to the extruder production line, through extrude, cooling and shaping and traction moulding form polychloroethylene pipes; (3) cut above-mentioned polychloroethylene pipes, it is for subsequent use that qualified polychloroethylene pipes is got in check;
The second step expansion molding comprises step: (4) are got above-mentioned qualified polychloroethylene pipes and are delivered in the oriontation shaping device, pass into the fluid media (medium) of high temperature and high pressure in the polychloroethylene pipes, polychloroethylene pipes is produced radially to be dilated, axial tension device two ends are mobile round about, make polychloroethylene pipes produce axial tension; (5) be biaxially orienting polyvinyl chloride tubing through cooling and shaping.
2. the method for claim 1, it is characterized in that: the temperature of the described fluid media (medium) in the step (4) is 80 ℃～110 ℃.
3. the method for claim 1, it is characterized in that: the pressure of the described fluid media (medium) in the step (4) is 1.3MPa～1.8MPa.
4. method as claimed in claim 2 or claim 3 is characterized in that: the processing time that described in the step (4) radially dilates with axial tension is 10-30 minute.
5. method as claimed in claim 2 or claim 3, it is characterized in that: described fluid media (medium) is recycling.
6. method as claimed in claim 2 or claim 3, it is characterized in that: described fluid media (medium) is water or air.
7. one kind is orientated polychloroethylene pipes, and it is by the described method preparation of arbitrary claim among the claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2013103180868A CN103358423A (en) | 2013-07-19 | 2013-07-19 | Method for producing orientation polyvinyl chloride pipe by two steps |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103180868A CN103358423A (en) | 2013-07-19 | 2013-07-19 | Method for producing orientation polyvinyl chloride pipe by two steps |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104017310A (en) * | 2014-06-20 | 2014-09-03 | 福建博大塑业新材料有限公司 | Biaxial orientation polyvinyl chloride pipe and preparation method thereof |
| CN105034399A (en) * | 2015-08-26 | 2015-11-11 | 安徽永高塑业发展有限公司 | Molding method for biaxial orientation polyvinyl chloride pipe for water supply |
| CN106366502A (en) * | 2016-08-29 | 2017-02-01 | 武汉金牛经济发展有限公司 | Off-line two-way stretched PVC(Polyvinyl Chloride) pipe preparation method and device |
| CN108527826A (en) * | 2018-03-09 | 2018-09-14 | 河北建投宝塑管业有限公司 | A kind of manufacture is orientated the process of polyvinyl chloride double-bellmouth pipe fitting |
| CN112848246A (en) * | 2021-01-25 | 2021-05-28 | 宜宾天亿新材料科技有限公司 | Forming die and forming method for biaxial orientation plastic pipe |
| CN113276397A (en) * | 2021-05-13 | 2021-08-20 | 新疆恒塑科技股份有限公司 | Process for producing PVC-O pipe by remolding method |
| US11267189B2 (en) | 2016-05-26 | 2022-03-08 | Dow Global Technologies, Llc | Mandrel and support assembly |
| CN115124794A (en) * | 2022-08-01 | 2022-09-30 | 江苏贝尔机械有限公司 | Biaxially oriented polyvinyl chloride pipe and preparation method thereof |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104017310A (en) * | 2014-06-20 | 2014-09-03 | 福建博大塑业新材料有限公司 | Biaxial orientation polyvinyl chloride pipe and preparation method thereof |
| CN104017310B (en) * | 2014-06-20 | 2016-08-24 | 福建博大塑业新材料有限公司 | A kind of biaxially orienting polyvinyl chloride pipe and preparation method thereof |
| CN105034399A (en) * | 2015-08-26 | 2015-11-11 | 安徽永高塑业发展有限公司 | Molding method for biaxial orientation polyvinyl chloride pipe for water supply |
| US11267189B2 (en) | 2016-05-26 | 2022-03-08 | Dow Global Technologies, Llc | Mandrel and support assembly |
| CN106366502A (en) * | 2016-08-29 | 2017-02-01 | 武汉金牛经济发展有限公司 | Off-line two-way stretched PVC(Polyvinyl Chloride) pipe preparation method and device |
| CN108527826A (en) * | 2018-03-09 | 2018-09-14 | 河北建投宝塑管业有限公司 | A kind of manufacture is orientated the process of polyvinyl chloride double-bellmouth pipe fitting |
| CN112848246A (en) * | 2021-01-25 | 2021-05-28 | 宜宾天亿新材料科技有限公司 | Forming die and forming method for biaxial orientation plastic pipe |
| CN112848246B (en) * | 2021-01-25 | 2023-02-03 | 宜宾天亿新材料科技有限公司 | Forming method of biaxial orientation plastic pipe |
| CN113276397A (en) * | 2021-05-13 | 2021-08-20 | 新疆恒塑科技股份有限公司 | Process for producing PVC-O pipe by remolding method |
| CN115124794A (en) * | 2022-08-01 | 2022-09-30 | 江苏贝尔机械有限公司 | Biaxially oriented polyvinyl chloride pipe and preparation method thereof |
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Inventor after: Wang Wenfeng Inventor after: Wang Ruifeng Inventor after: Wei Qiang Inventor after: Yang Yong Inventor after: Zhen Derong Inventor before: Wang Wenfeng Inventor before: Wang Ruifeng Inventor before: Yang Yong Inventor before: Zhen Derong |
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Free format text: CORRECT: INVENTOR; FROM: WANG WENFENG WANG RUIFENG YANG YONG ZHEN DERONG TO: WANG WENFENG WANG RUIFENG WEI QIANG YANG YONG ZHEN DERONG |
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Application publication date: 20131023 |
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