CN105856583A - Sintering method of large-caliber thin-wall polytetrafluoroethylene extruding pipe - Google Patents
Sintering method of large-caliber thin-wall polytetrafluoroethylene extruding pipe Download PDFInfo
- Publication number
- CN105856583A CN105856583A CN201610365159.2A CN201610365159A CN105856583A CN 105856583 A CN105856583 A CN 105856583A CN 201610365159 A CN201610365159 A CN 201610365159A CN 105856583 A CN105856583 A CN 105856583A
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- CN
- China
- Prior art keywords
- sintering
- temperature
- sintering method
- caliber thin
- walled
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- 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.)
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Classifications
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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
- B29C69/00—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore
- B29C69/02—Combinations of shaping techniques not provided for in a single one of main groups B29C39/00 - B29C67/00, e.g. associations of moulding and joining techniques; Apparatus therefore of moulding techniques only
-
- 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
- B29C48/001—Combinations of extrusion moulding with other shaping operations
-
- 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
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/02—Moulding by agglomerating
- B29C67/04—Sintering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
- B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
- B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
The invention discloses a sintering method of a large-caliber thin-wall polytetrafluoroethylene extruding pipe. A sintering manner in the vertical direction is adopted, a discharged extruding material is sequentially subjected to a low-temperature drying procedure, a high-temperature pre-sintering procedure, a high-temperature sintering procedure and the like in a traction manner, and after final forming, transverse placement is performed. Due to the adoption of sintering in the vertical direction, the large-caliber thin-wall polytetrafluoroethylene extruding pipe can always guarantee the coaxiality in the sintering process, and therefore collapse deformation and other defects are avoided; and besides, due to the effect of external traction force, the sintered pipe is more round and more uniform in wall thickness.
Description
Technical field
The present invention relates to sintering process, more particularly, it relates to a kind of large-caliber thin-walled politef
Extruding pipe sintering method.
Background technology
At present, polytetrafluoroethylextruded extruded pipe has been widely used for field of heat exchange, wherein main with mouth
Footpath is main less than 16 millimeters, but for larger caliber, such as the polytetrafluoro of more than 30 millimeters bores
Ethylene extruding pipe, so cannot effectively realize industrialized production.It main reason is that: tradition relatively osculum
The polytetrafluoroethylextruded extruded pipe in footpath is during drying and sintering, because its caliber is little, and thickness of pipe wall (wall thickness
It is typically 1/5～the 1/10 of tube outer diameter), therefore, can be placed directly on conveyer belt when sintering,
Enter laterally high temperature oven and be not easy deformation, i.e. traditional handicraft all uses laterally manufacture.If will
Bigbore thin-walled polytetrafluoroethylextruded extruded pipe is placed on similar conveyer belt entrance high temperature oven sintering,
Owing to its bore is big, tube wall thin (wall thickness is typically 1/40～the 1/100 of external diameter), dries entering high temperature
During case, tubing is susceptible to cave in downwards, deform and wall thickness is inconsistent.
In sum, for the polytetrafluoroethylextruded extruded of larger caliber, particularly more than 30 millimeters bores
Pipe, still uses traditional horizontal processing technique, cannot be suitable for completely, it is necessary to work out a kind of complete
New processing technique, meets the industrialized production of bigbore polytetrafluoroethylextruded extruded pipe.
Summary of the invention
The purpose of the present invention aims to provide a kind of large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering method,
It can be avoided that occur heavy caliber pipe that defects such as deforming, tube wall is uneven occurs.
This large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering method, comprises the following steps:
A. pushing extrusion equipment is used to be extruded by polyflon die orifice from the upper side, to hang down
Straight to top discharge；
B. use traction apparatus to draw extruded stock to low-temperature drying equipment vertically upward, do
Dry；
C. use traction apparatus to continue to draw vertically upward to high temperature presintering equipment by extruded stock, carry out
Presintering；
D. use traction apparatus to continue to draw vertically upward to high-temperature sintering apparatus by extruded stock, burn
Form type.
The hauling speed of described traction apparatus is identical with die orifice discharging speed,
The hauling speed of described traction apparatus controls 0.1～2m/min.
The baking temperature of described low-temperature drying equipment controls at 50～250 DEG C.
The pre-sintering temperature of described high temperature presintering equipment controls at 200～300 DEG C.
The sintering temperature of described high-temperature sintering apparatus controls at 300～400 DEG C.
The one large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering method using the present invention has following several
Individual advantage:
1, according to thermodynamic principles, heat is to transmit from the bottom up the most under normal circumstances, thus
In vertical direction, lower section temperature is low, and the most up temperature is the highest, makes sintering polytetrafluoroethylene rise in gradient
Temperature sintering, molding is more stable, and this sintering process is conducive to saving the energy simultaneously.
2, the sintering in vertical direction is used so that large-caliber thin-walled polytetrafluoroethylextruded extruded pipe is burning
Knot process ensure that axiality all the time, thus avoids the defects such as Collapse Deformation occurring, additionally due to have
The effect of external traction force so that the pipe after sintering is more round, wall thickness is evenly.
3, the polytetrafluoroethyltubing tubing using sintering method of the present invention to make can be widely applied to liquid biography
The various fields such as defeated, gas transmission, heat exchange.
Detailed description of the invention
During due to politef more than melting temperature, still there is no the so-called molten of common plastics
State, viscosity is very big, it is not possible to produce by traditional Screw Extrusion technique, but uses and be first preformed into
Base rod, carries out base rod pushing extrusion the most again.In polytetrafluoroethyltubing tubing extrusion, tradition
It is the method using horizontal direction to push extrusion, carries out high temperature burning by the baking oven of horizontal direction the most again
Knot.Such process, is only capable of meeting the Production requirement of small-bore polytetrafluoroethyltubing tubing, but
For heavy caliber pipe the most easily occur deformation, tube wall is uneven because heavy caliber pipe wall thickness with
Caliber is than big, and needs the long period to sinter, easily Collapse Deformation in sintering process, is unfavorable for burning
Knot sizing.
It is sintered in vertical direction by repeatedly studying and design discovery, it is possible in sintering process
Ensure the concentricity of extruding pipe, therefore, the one large-caliber thin-walled polytetrafluoroethylextruded extruded pipe of the present invention
Sintering method, uses the mode that sinters from the bottom up, specifically includes following steps:
A. pushing extrusion equipment is used to be extruded by polyflon die orifice from the upper side, to hang down
Straight to top discharge；
B. use traction apparatus to draw extruded stock to low-temperature drying equipment vertically upward, do
Dry so that politef is pushed necessary lubricating auxiliary agent and volatilized completely；
C. use traction apparatus to continue to draw vertically upward to high temperature presintering equipment by extruded stock, carry out
Presintering；
D. use traction apparatus to continue to draw vertically upward to high-temperature sintering apparatus by extruded stock, burn
Form type.
Top is located in described traction apparatus, is pulled up by extruded stock, sequentially passes through cold drying and sets
Standby, high temperature presintering equipment and high-temperature sintering apparatus, finally by the extruding pipe of sinter molding by traction
And laterally disposed, in whole distraction procedure, the hauling speed of traction apparatus is identical with die orifice discharging speed.
As an embodiment, the hauling speed of described traction apparatus controls 0.1～2m/min.
And through repeatedly repetition test and calculating, the baking temperature of described low-temperature drying equipment is controlled
At 50～250 DEG C.The pre-sintering temperature of described high temperature presintering equipment is controlled at 200～300 DEG C.
The sintering temperature of described high-temperature sintering apparatus is controlled at 300～400 DEG C.
Certainly, it should be noted that use traction apparatus that extruded stock sequentially passes through low temperature vertically downward
Drying equipment, high temperature presintering equipment and high-temperature sintering apparatus be dried, presintering, the mode of sintering,
Its principle is substantially identical with above-mentioned mode vertically upward, falls within claims of the present invention equally and is wanted
Seek the scope of protection.
The polytetrafluoroethyltubing tubing made through the sintering method of the present invention can be widely applied to liquid transmission,
The various fields such as gas transmission, heat exchange, have the following characteristics that
1, corrosion resistance, politef itself has the performances such as good strong alkali-acid resistance, due to height
Fully, entirely without hole in polytetrafluoroethyltubing tubing, compactness is good, and density exists for temperature sintering
2.1～2.2g/cm3Between, can be widely used in for a long time heat-exchange tube needed for various field of heat exchange,
Various liquid transmission, gas transmission and do not reveal, permeate.
2, resistant of high or low temperature, polytetrafluoroethyltubing tubing that this sintering process is made uses the temperature can be
Between-50～260 DEG C, when 230 DEG C, burst pressure is up to 2kg/cm2, it is ensured that polytetrafluoroethyltubing tubing
As the medium of the heat transferring medium of different temperatures, have between good dimensional stability and heat transferring medium
It is not directly contacted with mutually, thus avoids various contingent unsafe factor.
3, heat transfer efficient, due to heat transfer coefficient is ordinary carbon steel the 1/250 of politef,
For 0.184w/ (m K), so being to ensure higher heat exchanger effectiveness, tube wall gets over Bao Yuehao, institute
With the polytetrafluoroethyltubing tubing of word sintering process, tube wall can be thin to the 1/40～1/100 of caliber.
In sum, the sintering method of the present invention is used, it is adaptable to the polyfluortetraethylene pipe of various bores
Material makes, and is particularly suitable for heavy caliber (30 millimeters with), (wall thickness is typically external diameter to thin pipe wall
1/40～1/100) polytetrafluoroethyltubing tubing processing and fabricating, is fully able to avoid finding deformation, tube wall
The defect such as uneven.
Those of ordinary skill in the art is it should be appreciated that above description is only the present invention
One or more embodiments in numerous embodiments, and not use limitation of the invention.Any right
The technical schemes such as impartial change, modification and the equivalent replacement in embodiment described above, as long as meeting
The spirit of the present invention, all will fall in the range of claims of the present invention is protected.
Claims (6)
1. a large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering method, it is characterised in that include with
Lower step:
A. pushing extrusion equipment is used to be extruded by polyflon die orifice from the upper side, to hang down
Straight to top discharge；
B. use traction apparatus to draw extruded stock to low-temperature drying equipment vertically upward, do
Dry；
C. use traction apparatus to continue to draw vertically upward to high temperature presintering equipment by extruded stock, carry out
Presintering；
D. use traction apparatus to continue to draw vertically upward to high-temperature sintering apparatus by extruded stock, burn
Form type.
A kind of large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering method the most as claimed in claim 1,
It is characterized in that: the hauling speed of described traction apparatus is identical with die orifice discharging speed.
A kind of large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering method the most as claimed in claim 2,
It is characterized in that: the hauling speed of described traction apparatus controls 0.1～2m/min.
A kind of large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering method the most as claimed in claim 1,
It is characterized in that: the baking temperature of described low-temperature drying equipment controls at 50～250 DEG C.
A kind of large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering method the most as claimed in claim 1,
It is characterized in that: the pre-sintering temperature of described high temperature presintering equipment controls at 200～300 DEG C.
A kind of large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering method the most as claimed in claim 1,
It is characterized in that: the sintering temperature of described high-temperature sintering apparatus controls at 300～400 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610365159.2A CN105856583B (en) | 2016-05-26 | 2016-05-26 | A kind of large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610365159.2A CN105856583B (en) | 2016-05-26 | 2016-05-26 | A kind of large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105856583A true CN105856583A (en) | 2016-08-17 |
| CN105856583B CN105856583B (en) | 2018-01-26 |
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ID=56642317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610365159.2A Active CN105856583B (en) | 2016-05-26 | 2016-05-26 | A kind of large-caliber thin-walled polytetrafluoroethylextruded extruded pipe sintering method |
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| Country | Link |
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| CN (1) | CN105856583B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106554589A (en) * | 2016-10-14 | 2017-04-05 | 上海吾牛氟塑管业有限公司 | Enhanced polytetrafluoroethylene dispersion resin pipe |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102205651A (en) * | 2010-12-24 | 2011-10-05 | 东莞市新志密封技术有限公司 | Method for sintering polytetrafluoroethylene |
| CN103978709A (en) * | 2014-05-12 | 2014-08-13 | 四会市生料带厂有限公司 | Manufacturing method of polytetrafluoroethylene enhanced pipe |
| CN104015370A (en) * | 2014-06-04 | 2014-09-03 | 东莞市格尼斯电子有限公司 | Preparation process of teflon heat-shrinking tube |
| CN203844239U (en) * | 2014-03-14 | 2014-09-24 | 青岛远东富隆新材料有限公司 | High-efficiency sintering furnace of polytetrafluoroethylene tubes |
| CN205167594U (en) * | 2015-12-09 | 2016-04-20 | 东莞市格尼斯电子有限公司 | Pyrocondensation pipe former |
-
2016
- 2016-05-26 CN CN201610365159.2A patent/CN105856583B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102205651A (en) * | 2010-12-24 | 2011-10-05 | 东莞市新志密封技术有限公司 | Method for sintering polytetrafluoroethylene |
| CN203844239U (en) * | 2014-03-14 | 2014-09-24 | 青岛远东富隆新材料有限公司 | High-efficiency sintering furnace of polytetrafluoroethylene tubes |
| CN103978709A (en) * | 2014-05-12 | 2014-08-13 | 四会市生料带厂有限公司 | Manufacturing method of polytetrafluoroethylene enhanced pipe |
| CN104015370A (en) * | 2014-06-04 | 2014-09-03 | 东莞市格尼斯电子有限公司 | Preparation process of teflon heat-shrinking tube |
| CN205167594U (en) * | 2015-12-09 | 2016-04-20 | 东莞市格尼斯电子有限公司 | Pyrocondensation pipe former |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106554589A (en) * | 2016-10-14 | 2017-04-05 | 上海吾牛氟塑管业有限公司 | Enhanced polytetrafluoroethylene dispersion resin pipe |
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| Publication number | Publication date |
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| CN105856583B (en) | 2018-01-26 |
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