CN1203852A - High temp. cooling making method for polytetrafluoroethylene film lining - Google Patents
High temp. cooling making method for polytetrafluoroethylene film lining Download PDFInfo
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- CN1203852A CN1203852A CN 97112666 CN97112666A CN1203852A CN 1203852 A CN1203852 A CN 1203852A CN 97112666 CN97112666 CN 97112666 CN 97112666 A CN97112666 A CN 97112666A CN 1203852 A CN1203852 A CN 1203852A
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- pipe
- lining
- lining pipe
- polytetrafluoroethyllining lining
- polytetrafluoroethyllining
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Abstract
The high-temp. cooling production process of tight liner polytetrafluoroethylene includes the following technological procedures of pipe-forming, demoulding, lining-in and flanging, etc., and is characterized by that the demoulded polytetrafluoroethylene lining pipe is heated to 300 deg.C-380 deg.C, heating speed is 50-70 deg.c/hr, heat-insulated for 8-24 hr,then cooled to normal temp., and when the lining pipe is inlaid, said invention adopts tight fit process so that it can raise the strength of pipe body and its vacuum level.
Description
The method of manufacturing teflon lined pipeline commonly used is wanted two kinds at present.A kind of employing pusher method is made, and the another kind of bar that adopts is lathed the polytetrafluoroethylene film band, and it is wrapped on the metallic conduit mould, tightens with glass cloth again, and sinter molding promptly obtains the polytetrafluoroethyllining lining pipe after the demoulding then.With the polytetrafluoroethyllining lining pipe that above-mentioned two kinds of methods make, lining is gone in the steel pipe again.But they all serve as a contrast defective tightness, so fail really to solve the bigger deadly defect of value such as heat expansion, shrinkage, creep of polytetrafluoroethyllining lining pipe, cause the teflon lined pipeline when conveyer belt temperature fluid media (medium), internal lining pipe to occur and subside; Perhaps two end flanges flange mouths shrink and break, and inner cavity of pipe is stopped up, and then make operational failure.In order to make the teflon lined pipeline have certain rigid, and reduce heat expansion, shrinkage amount, make its unlikely subsiding when the band temperature is carried fluid media (medium), occur a kind of polytetrafluoroethyllining lining pipeline again with the woven wire interlayer; But the woven wire interlayer in this pipeline and the coefficient of expansion of polytetrafluoroethylene (PTFE) differ very big, can make its drawing crack and lost efficacy when the operation of band temperature, and service life is shorter.So above-mentioned several polytetrafluoroethylene (PTFE) pipeline all can not guarantee the production life cycle, brings very big loss to the user.
Trace it to its cause is because extruding pipe (pusher method), winding pipe and the band woven wire interlayer winding pipe etc. of existing processing and fabricating, its tubing, the density that is polytetrafluoroethylene (PTFE) is not enough, general proportion is all below 2.0, and the molecular structure defective tightness is so pipeline is when being heated, its polytetrafluoroethylene (PTFE) molecule has certain scope of activities, thereby, make the polytetrafluoroethylene (PTFE) pipeline produce bigger distortion, heat expansion, creep and serious contraction in use, cause in use goods to be scrapped.
In addition, the external diameter of existing method teflon lined pipe less than pipe diameter so that lining go into, but the air between lining and the steel pipe is difficult to drain, and draws the liner that collapses easily when vacuum is moved, and makes operational failure.
The high temperature cooling autofrettage that the purpose of this invention is to provide the high tight lining teflon pipeline of a kind of lining self intensity.
Further, another object of the present invention provides the manufacture method of the tight lining teflon pipeline that vacuum is big between a kind of lining and the steel pipe.
The present invention includes following processing step:
One. the pipeline moulding
The teflon rod truck is whittled into the polytetrafluoroethylene film band, is wound into then on the metal tube mould, and tighten with glass cloth, sinter molding is the polytetrafluoroethyllining lining pipe.
Two. the demoulding
The polytetrafluoroethyllining lining pipe of sinter molding is enlarged on mould and shirk down.
Three. the cooling of heating
To shirk the polytetrafluoroethyllining lining pipe that gets off and be warmed to 300 ℃～380 ℃, 50 ℃～70 ℃ of programming rates are incubated 8～24 hours, are cooled to normal temperature again.
Four. tight lining
The polytetrafluoroethyllining lining pipe is drawn in the steel pipe.
Five. flange
After the internal lining pipe of polytetrafluoroethylene (PTFE) was sewed in the steel pipe, suitable flange surplus was stayed at two ends, carried out flange and handled.
Can make high-intensity teflon lined pipe by above processing step.
Further, for improving the intensity of teflon lined, before carrying out the moulding of step 1 pipeline, earlier the polytetrafluoroethylene (PTFE) bar is heated to 300 ℃～380 ℃, programming rate is 50 ℃～70 ℃/hour, is incubated 8～24 hours again, naturally cools to normal temperature again.
Further, be the vacuum between raising teflon lined and the steel pipe, the operation intensity of reinforced TFE internal lining pipe under vacuum condition, in processing step four tight linings, take following measure:
A. the diameter of polytetrafluoroethyllining lining pipe is greater than 1～5 millimeter of pipe diameter.
B. the tube head end diameter of polytetrafluoroethyllining lining pipe is turned in the described internal lining pipe tube head less than diameter of steel tube, with chuck tube head is clipped.
C. clear up the steel pipe inwall.
D. will clip the polytetrafluoroethyllining lining pipe of liner tube head, and draw equipment to force lining to be gone in the steel pipe with sewing.
The invention has the advantages that: raw material and the semi-finished product molded polytetrafluoroethylarticle pipe of making the polytetrafluoroethyllining lining pipe all once carried out Overheating Treatment, promptly be warmed in the scope of polytetrafluoroethylene (PTFE) cooling after-contraction amount minimum, be about below 1～2 times of steel coefficient, at this moment, the proportion of polytetrafluoroethylene (PTFE) is between 2.2～2.3.Make polytetrafluoroethylene (PTFE) micel chain stable within the specific limits, thereby can control its molecule and be heated, only having when cooling off minimum scope of activities.And then solved the molded polytetrafluoroethylarticle internal lining pipe be heated, expansion when cooling off, contraction and the bigger problem of creep compliance, reached in being with warm medium use can not subside, shortcomings such as fracture and inner chamber obstruction, even under vacuum condition, move, also has higher reliability.
In addition, owing to adopt the tight lining method of internal lining pipe external diameter, the interlayer air between steel pipe walls and the polytetrafluoroethyllining lining pipe outer wall has been got rid of substantially when drawing in steel pipe in that internal lining pipe is sewed, made it be in vacuum state greater than pipe diameter.So polytetrafluoroethyllining lining pipe unlikely being drawn when vacuum is moved collapsed and subsided.So product has reached the specification requirement that moves under vacuum condition.
Further specify the present invention below in conjunction with accompanying drawing:
Fig. 1 is a process chart of the present invention
Fig. 2 sews tension lining process schematic representation
Embodiment one
With reference to accompanying drawing: the high temperature cooling autofrettage of tight lining teflon of the present invention comprises following processing step:
One. the pipeline moulding
The teflon rod truck is whittled into the polytetrafluoroethylene film band, is wound into then on the metal tube mould, and tighten with glass cloth, sinter molding is the polytetrafluoroethyllining lining pipe.
Two. the demoulding
The polytetrafluoroethyllining lining pipe of sinter molding is enlarged on mould and shirk down.
Three. the cooling of heating
To shirk the polytetrafluoroethyllining lining pipe that gets off and be warmed to 300 ℃～380 ℃, 50 ℃～70 ℃ of programming rates are incubated 8～24 hours, are cooled to normal temperature again.
Four. tight lining
A. the diameter of polytetrafluoroethyllining lining pipe 1 is greater than 1～5 millimeter of steel pipe 2 internal diameter, presses the diameter of goods and decides greater than the occurrence of value.
B. tube head end 4 diameters of polytetrafluoroethyllining lining pipe turn in the described internal lining pipe tube head less than diameter of steel tube, with chuck 3 tube head are clipped, and sew and draw connector 6 to connect chucks 3 by binding nut 5.
C. clear up the steel pipe inwall.
D. will clip the polytetrafluoroethyllining lining pipe of liner tube head, and draw equipment to force lining to be gone in the steel pipe with sewing.
Five. flange
After the internal lining pipe of polytetrafluoroethylene (PTFE) was sewed in the steel pipe, suitable flange surplus was stayed at two ends, carried out flange and handled.
Embodiment two
The high temperature cooling autofrettage of tight lining teflon of the present invention comprises following processing step:
One. the pipeline moulding
Earlier the polytetrafluoroethylene (PTFE) bar is heated to 300 ℃～380 ℃, programming rate is 50 ℃～70 ℃/hour, and constant temperature kept 8～24 hours again, naturally cooled to normal temperature again.
Reface becomes the polytetrafluoroethylene film band, is wound into then on the metal tube mould, and tightens with glass cloth, and sinter molding is the polytetrafluoroethyllining lining pipe.
Two. the demoulding
The polytetrafluoroethyllining lining pipe of sinter molding is enlarged on mould and shirk down.
Three. the cooling of heating
To shirk the polytetrafluoroethyllining lining pipe that gets off and be warmed to 300 ℃～380 ℃, 50 ℃～70 ℃ of programming rates are incubated 8～24 hours, are cooled to normal temperature again.
Four. tight lining
A. the diameter of polytetrafluoroethyllining lining pipe 1 is greater than 1～5 millimeter of steel pipe 2 internal diameter, presses the diameter of goods and decides greater than the occurrence of value.
B. tube head end 4 diameters of polytetrafluoroethyllining lining pipe turn in the described internal lining pipe tube head less than diameter of steel tube, with chuck 3 tube head are clipped, and sew and draw connector 6 to connect chucks 3 by binding nut 5.
C. clear up the steel pipe inwall.
D. will clip the polytetrafluoroethyllining lining pipe of liner tube head, and draw equipment to force lining to be gone in the steel pipe with sewing.
Five. flange
After the internal lining pipe of polytetrafluoroethylene (PTFE) was sewed in the steel pipe, suitable flange surplus was stayed at two ends, carried out flange and handled.
Claims (3)
1. the high temperature of tight lining teflon cools off autofrettage, comprises following processing step:
One. the pipeline moulding
The teflon rod truck is whittled into the polytetrafluoroethylene film band, is wound into then on the metal tube mould, and tighten with glass cloth, sinter molding is the polytetrafluoroethyllining lining pipe.
Two. the demoulding
The polytetrafluoroethyllining lining pipe of sinter molding is enlarged on mould and shirk down.
Three. the cooling of heating
To shirk the polytetrafluoroethyllining lining pipe that gets off and be warmed to 300 ℃～380 ℃, 50 ℃～70 ℃ of programming rates are incubated 8～24 hours, are cooled to normal temperature again.
Four. lining is gone into
The polytetrafluoroethyllining lining pipe is served as a contrast in the steel pipe.
Five. flange
After the internal lining pipe of polytetrafluoroethylene (PTFE) was sewed in the steel pipe, suitable flange surplus was stayed at two ends, carried out flange and handled.
2. the high temperature of tight lining teflon as claimed in claim 1 cools off autofrettage, it is characterized in that: before carrying out the moulding of step 1 pipeline, earlier the polytetrafluoroethylene (PTFE) bar is heated to 300 ℃～380 ℃, programming rate is 50 ℃～70 ℃/hour, be incubated 8～24 hours again, naturally cool to normal temperature again.
3. the high temperature of tight lining teflon as claimed in claim 1 or 2 cools off autofrettage, and it is characterized in that: adopt tight lining method that the polytetrafluoroethyllining lining pipe is served as a contrast in the steel pipe, idiographic flow is:
A. the diameter of polytetrafluoroethyllining lining pipe is greater than 1～5 millimeter of pipe diameter.
B. the tube head end diameter of polytetrafluoroethyllining lining pipe is turned in the described internal lining pipe tube head less than diameter of steel tube, with chuck tube head is clipped.
C. clear up the steel pipe inwall.
D. will clip the polytetrafluoroethyllining lining pipe of liner tube head, and draw equipment to force lining to be gone in the steel pipe with sewing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97112666 CN1203852A (en) | 1997-06-26 | 1997-06-26 | High temp. cooling making method for polytetrafluoroethylene film lining |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97112666 CN1203852A (en) | 1997-06-26 | 1997-06-26 | High temp. cooling making method for polytetrafluoroethylene film lining |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1203852A true CN1203852A (en) | 1999-01-06 |
Family
ID=5172426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97112666 Pending CN1203852A (en) | 1997-06-26 | 1997-06-26 | High temp. cooling making method for polytetrafluoroethylene film lining |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1203852A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103883809A (en) * | 2012-12-21 | 2014-06-25 | 南通好的防腐装备有限公司 | Teflon pipeline with double composite steel liners |
| CN108644512A (en) * | 2018-07-09 | 2018-10-12 | 南京氟源化工管道设备有限公司 | A kind of steel lining polytetrafluoroethylene tee and its mould pressing process |
| CN108644490A (en) * | 2018-07-09 | 2018-10-12 | 南京氟源化工管道设备有限公司 | A kind of steel lining polytetrafluoroethylene (PTFE) straight tube and its mould pressing process |
| CN108973139A (en) * | 2018-09-25 | 2018-12-11 | 贵州祥宇泵阀制造有限公司 | A kind of processing method of tetrafluoro seamless welding production |
| CN109488814A (en) * | 2017-09-12 | 2019-03-19 | 丹阳市丹达防腐设备有限公司 | A kind of moulding process of fluoroplastics steel-lined plastic composite pipe |
| CN111572078A (en) * | 2020-03-31 | 2020-08-25 | 镇江瑞昊工程塑料有限公司 | Manufacturing process of steel lining polytetrafluoroethylene pipeline |
-
1997
- 1997-06-26 CN CN 97112666 patent/CN1203852A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103883809A (en) * | 2012-12-21 | 2014-06-25 | 南通好的防腐装备有限公司 | Teflon pipeline with double composite steel liners |
| CN109488814A (en) * | 2017-09-12 | 2019-03-19 | 丹阳市丹达防腐设备有限公司 | A kind of moulding process of fluoroplastics steel-lined plastic composite pipe |
| CN108644512A (en) * | 2018-07-09 | 2018-10-12 | 南京氟源化工管道设备有限公司 | A kind of steel lining polytetrafluoroethylene tee and its mould pressing process |
| CN108644490A (en) * | 2018-07-09 | 2018-10-12 | 南京氟源化工管道设备有限公司 | A kind of steel lining polytetrafluoroethylene (PTFE) straight tube and its mould pressing process |
| CN108973139A (en) * | 2018-09-25 | 2018-12-11 | 贵州祥宇泵阀制造有限公司 | A kind of processing method of tetrafluoro seamless welding production |
| CN111572078A (en) * | 2020-03-31 | 2020-08-25 | 镇江瑞昊工程塑料有限公司 | Manufacturing process of steel lining polytetrafluoroethylene pipeline |
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