CN105034399A - Molding method for biaxial orientation polyvinyl chloride pipe for water supply - Google Patents
Molding method for biaxial orientation polyvinyl chloride pipe for water supply Download PDFInfo
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- CN105034399A CN105034399A CN201510534968.7A CN201510534968A CN105034399A CN 105034399 A CN105034399 A CN 105034399A CN 201510534968 A CN201510534968 A CN 201510534968A CN 105034399 A CN105034399 A CN 105034399A
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- polyvinyl chloride
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- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides a molding method for a biaxial orientation polyvinyl chloride pipe for water supply. The molding method comprises the following steps that premolding is carried out, wherein a pipe mold blank is cooled to the melting and softening temperature; then, the melt and softened material is made to pass through a pipe mold of an extruding machine, and meanwhile the material passes through a premolding sizing sleeve, wherein a pipe mold mandrel extends and enters the premolding sizing sleeve; the pre-set material passes through a molding sizing sleeve connected to the premolding sizing sleeve of the extruding machine; the set material then passes through a small pipe-expanding machine arranged at the tail end of the pipe mold mandrel to carry out expanding; the longitudinal crystallization orientation material receives the traction action of a tractor; and finally, the transverse crystallization orientation material is cooled. The biaxial orientation polyvinyl chloride pipe manufactured through the technology and used for water supply is very high in anti-shock and anti-pressure ability, and thus the service life of the pipe can be prolonged.
Description
Technical field
The present invention relates to Production of Plastic Building Materials field, be specifically related to the forming method of feedwater biaxially orienting polyvinyl chloride tubing
Background technology
PVC belongs to the macromolecular material of non-crystalline type, because the polarity chlorine element in molecule exists, therefore PVC possesses higher rigidity, between vitrification point and melt temperature, under external force, molecule segment changes from lack of alignment to ordered arrangement, and material is anisotropy by isotropic transition.Common PVC-U water-feeding pipes only carries out axial orientation under tractive force effect, therefore the minimum desired strength MRS of common PVC-U water-feeding pipes is 25MPa, and PVC-O tubing is owing to carrying out biaxial stretch-formed orientation, tubing axially all carries out oriented crystalline with radial direction, and therefore the MRS of PVC-O water-feeding pipes is the highest can be 50MPa.Common PVC-U water-feeding pipes 50 years safety coefficients are 2.0-2.5, and 50 of PVC-O tubing years desirable 1.4-1.6 of safety coefficient.Therefore, under 50 years safe handling conditions, the material that 30-50% saved by PVC-U tubing is compared.
Simultaneously common PVC-U water-feeding pipes is in pressurized situation, easily produces some load and produces stress cracking, causes tubing to break breakage, and PVC-O water-feeding pipes is due to double orientation, produce thin slice hierarchy, reduce stress and concentrate, can effectively organize crackle to pass through in the material.Therefore PVC-O water-feeding pipes possesses better short-term and long-term strength, can be widely used in the fields such as feedwater piping, mine pipeline, non-excavation laying and reparation pipeline, gas ductwork.
But the forming method due to PVC-O water-feeding pipes mostly is foreign technology monopolization, domesticly still rest on theoretical research stage or indivedual producer's development phase, and be difficult to on-line continuous and produce.
Summary of the invention
For above problems of the prior art, the invention provides the forming method of the feedwater biaxially orienting polyvinyl chloride tubing that a kind of on-line continuous is produced.
The present invention is achieved by the following technical solutions:
The feedwater forming method of biaxially orienting polyvinyl chloride tubing, its step is as follows:
1) preformed, is cooled to melting softening temperature by tubing type embryo;
2) by the pipe mold of the material in step 1 by extruder, and simultaneously material extends in the preformed calibration sleeve that enters by pipe mold plug;
3) by the material of step 2 by being connected in the shaping calibration sleeve of extruder preformed calibration sleeve;
4) by the small-sized pipe-expanding machine that the material of step 3 is arranged by pipe mold mandrel tip, therefore material is carried out longitudinal crystalline orientation;
5), under the material of step 4 being passed through the tractive force effect of hauling machine, therefore tubing type embryo is carried out transverse crystallizing orientation;
6) material of step 5 is cooled.
Further, the small-sized pipe-expanding machine of described step 4 is arranged in shaping calibration sleeve, and small-sized pipe-expanding machine inside is promoted by cylinder; Pipe-expanding machine forms circle by 6-8 sheet.
Further, described small-sized pipe-expanding machine and plug are all connected in pipe mold with screw mandrel.
Beneficial effect of the present invention is: the feedwater biaxially orienting polyvinyl chloride tubing that present invention process makes, in raising tubing intensity, while reducing tubing hydraulic pressure risk of rupture, and on-line continuous can be produced, enhanced productivity.
Detailed description of the invention
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The invention provides the forming method of feedwater biaxially orienting polyvinyl chloride tubing, its step is as follows:
First preformed, is cooled to melting softening temperature by tubing type embryo, can provide the embryo of the tubing type before biaxial orientation like this; After aforementioned melt is softened after material by the pipe mold of extruder, and material extends in the preformed calibration sleeve that enters by pipe mold plug simultaneously; By the material after pre-setting by being connected in the shaping calibration sleeve of extruder preformed calibration sleeve, therefore can obtain molding materials, therefore shaping calibration sleeve can determine product external diameter, the out-of-roundness of tubing after biaxial orientation; Again the small-sized pipe-expanding machine that the material after sizing is arranged by pipe mold mandrel tip is carried out enlarging, therefore material is carried out longitudinal crystalline orientation, pipe-expanding machine forms circle by 6-8 sheet, and cylinder promotes the expansion of tubing type embryo in pipe-expanding machine inside, carries out longitudinal crystalline orientation; By the material of longitudinal crystalline orientation by under the tractive force effect of hauling machine, therefore tubing type embryo is carried out transverse crystallizing orientation; Finally cooled by the material of transverse crystallizing orientation, described small-sized pipe-expanding machine and plug are all connected in pipe mold with screw mandrel.
The anti-impact anti-pressure ability of the feedwater biaxially orienting polyvinyl chloride tubing that present invention process makes is very strong, the feedwater that technique makes biaxially orienting polyvinyl chloride tubing is improving tubing intensity, while reducing tubing hydraulic pressure risk of rupture, and can on-line continuous produce, enhance productivity, therefore can improve the service life of tubing.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. the feedwater forming method of biaxially orienting polyvinyl chloride tubing, is characterized in that: its step is as follows:
1) preformed, is cooled to melting softening temperature by tubing type embryo;
2) by the pipe mold of the material in step 1 by extruder, and simultaneously material is extended by pipe mold plug in the preformed calibration sleeve that enters
3) by the material of step 2 by being connected in the shaping calibration sleeve of extruder preformed calibration sleeve;
4) by the small-sized pipe-expanding machine that the material of step 3 is arranged by pipe mold mandrel tip, therefore material is carried out longitudinal crystalline orientation;
5), under the material of step 4 being passed through the tractive force effect of hauling machine, therefore tubing type embryo is carried out transverse crystallizing orientation;
6) material of step 5 is cooled.
2. the forming method of feedwater biaxially orienting polyvinyl chloride tubing according to claim 1, is characterized in that: the small-sized pipe-expanding machine of described step 4 is arranged in shaping calibration sleeve, and small-sized pipe-expanding machine inside is promoted by cylinder; Pipe-expanding machine forms circle by 6-8 sheet.
3. the forming method of feedwater biaxially orienting polyvinyl chloride tubing according to claim 1 and 2, is characterized in that: described small-sized pipe-expanding machine and plug are all connected in pipe mold with screw mandrel.
Priority Applications (1)
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CN201510534968.7A CN105034399A (en) | 2015-08-26 | 2015-08-26 | Molding method for biaxial orientation polyvinyl chloride pipe for water supply |
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CN201510534968.7A CN105034399A (en) | 2015-08-26 | 2015-08-26 | Molding method for biaxial orientation polyvinyl chloride pipe for water supply |
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CN201510534968.7A Pending CN105034399A (en) | 2015-08-26 | 2015-08-26 | Molding method for biaxial orientation polyvinyl chloride pipe for water supply |
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Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107553885A (en) * | 2016-06-30 | 2018-01-09 | 新疆天业(集团)有限公司 | A kind of double orientation stretching device |
CN110621474A (en) * | 2017-03-30 | 2019-12-27 | Sabic环球技术有限责任公司 | Method for modifying and joining oriented pipes |
Citations (5)
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CN101537712A (en) * | 2009-04-07 | 2009-09-23 | 山东陆宇塑胶工业有限公司 | Continuous production technology of polyvinyl chloride pipe stretched in two directions |
CN101670665A (en) * | 2009-10-19 | 2010-03-17 | 杭州波达塑料科技股份有限公司 | Online biaxial-orienting PVC extrusion molding mould |
CN103358423A (en) * | 2013-07-19 | 2013-10-23 | 内蒙古亿利塑业有限责任公司 | Method for producing orientation polyvinyl chloride pipe by two steps |
CN103395183A (en) * | 2013-07-26 | 2013-11-20 | 鹤山市塑协塑料加工技术研究所有限公司 | Manufacturing equipment and production process and method of biaxial orientation PVC (Poly Vinyl Chloride) and polyolefin material pipe |
CN204547057U (en) * | 2015-01-09 | 2015-08-12 | 联塑科技发展(武汉)有限公司 | A kind of process units of double-axial hard polyvinyl chloride tubular material |
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2015
- 2015-08-26 CN CN201510534968.7A patent/CN105034399A/en active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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CN101537712A (en) * | 2009-04-07 | 2009-09-23 | 山东陆宇塑胶工业有限公司 | Continuous production technology of polyvinyl chloride pipe stretched in two directions |
CN101670665A (en) * | 2009-10-19 | 2010-03-17 | 杭州波达塑料科技股份有限公司 | Online biaxial-orienting PVC extrusion molding mould |
CN103358423A (en) * | 2013-07-19 | 2013-10-23 | 内蒙古亿利塑业有限责任公司 | Method for producing orientation polyvinyl chloride pipe by two steps |
CN103395183A (en) * | 2013-07-26 | 2013-11-20 | 鹤山市塑协塑料加工技术研究所有限公司 | Manufacturing equipment and production process and method of biaxial orientation PVC (Poly Vinyl Chloride) and polyolefin material pipe |
CN204547057U (en) * | 2015-01-09 | 2015-08-12 | 联塑科技发展(武汉)有限公司 | A kind of process units of double-axial hard polyvinyl chloride tubular material |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN107553885A (en) * | 2016-06-30 | 2018-01-09 | 新疆天业(集团)有限公司 | A kind of double orientation stretching device |
CN110621474A (en) * | 2017-03-30 | 2019-12-27 | Sabic环球技术有限责任公司 | Method for modifying and joining oriented pipes |
CN110621474B (en) * | 2017-03-30 | 2021-06-29 | Sabic环球技术有限责任公司 | Method for modifying and joining oriented pipes |
US11396124B2 (en) | 2017-03-30 | 2022-07-26 | Sabic Global Technologies B.V. | Process for modifying and joining oriented pipes |
US11992997B2 (en) | 2017-03-30 | 2024-05-28 | Sabic Global Technologies B.V. | Biaxially oriented pipe with a thickened end portion |
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Application publication date: 20151111 |