CN1294962A - Manufacture of thermally shrinking pipe - Google Patents
Manufacture of thermally shrinking pipe Download PDFInfo
- Publication number
- CN1294962A CN1294962A CN 00122353 CN00122353A CN1294962A CN 1294962 A CN1294962 A CN 1294962A CN 00122353 CN00122353 CN 00122353 CN 00122353 A CN00122353 A CN 00122353A CN 1294962 A CN1294962 A CN 1294962A
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- Prior art keywords
- pipe fitting
- width
- cloth
- pipe
- manufacture method
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Abstract
The thermally shrinkage pipe is suitable for the connection of pipes of different material, such as plastic, steel and cast iron as well as the repairing of damaged and leaking pipes. The pipes may be used in conveying virious gas and liquid material at normal or high pressure. The thermally shrinkage pipe is produced by using polyethylene as main material and through puffing while adding assistant, injection to form, gamma-ray radiation for crosslinking to modify and painting glue.
Description
What the present invention relates to is the manufacture method that a kind of plastic tube connects the thermal contraction type pipe fitting of usefulness.Use the thermally shrinking pipe of this method manufacturing to be applicable to the connection of plastic lined piping, also be applicable to being connected of plastic tube and steel pipe, cast iron pipe, the material of carrying in the pipeline can be that normal pressure also can be to have pressure.
In all types of plastic pipe installation work progress such as all gases, liquid, the connection of pipeline is very crucial.Therefore, pipe fitting also is an indispensable critical component in the work progress.Because the plastic tube of different cultivars, different size, all require to have certain seal and pressure bearing standard, so, just very easily cause the distortion at pipeline interface place, overproof and reducing if connecting tube is improper, especially being connected of plastic tube and steel pipe, cast iron pipe, all exist certain degree of difficulty.In addition, produce at plastic lined piping break, when damage and seepage, also be a great problem if repair when thinking of.
At present, the known technology that uses in plastic lined piping laying construction process has: 1, intubate connects: the gluing intubate connected in 1. pipe connect.2. establishing rubber sealing in connects.Because the underground plastic lined piping of burying underground is subjected to bury again the extruding (or other external force effect) of soil, it is low that plastic tube easily produces in pipe connects and is offset, causes seepage, pressure is born in sealing.2, welding: described in Chinese patent 90103705, adopt welding to need use welding equipment, junction intensity is low, bear that pressure is low, construction bothers, and expense is higher.3, hot melt connects: described in Chinese patent 97196602, this method is to carry out in a heater station, and construction is inconvenient, and expense is higher.
The present invention has solved the problems referred to above well, the thermally shrinking pipe of being addressed can satisfy or surpass different cultivars, the desired pressure bearing and seal standard of all size plastic pipe, can solve the distortion of tubing interface again, reducing and overproof and plastic tube and steel pipe, the knotty problem that plastic tube is connected with cast iron pipe, and construction is simple, convenient, easily go, can be used for various have press or do not have a body of calming the anger, liquid (water for industrial use, agricultural drainage and irrigation, petrochemical industry, plumbing) plastic tube such as, plastic tube and steel pipe, plastic tube is connected with cast iron pipe, also can be used for repairing breaking, the pipeline of damage and seepage.
The present invention is that the employing polyethylene is a primary raw material, after the adding auxiliary agent is mixing, through injector injection moulding, carries out cross-linking modified then.The polyethylene molecule is made up of the strand of linearity, and when temperature raise, the adhesion of linear molecule chain just weakened, and makes whole material generation deformation.Because of poly creep temperature is lower, and crosslinked polyethylene has formed three-dimensional structure molecule can not be subjected to displacement at the intermolecular chemical bond bridge of having erected.Like this crosslinked polyethylene not only temperature resistant grade improve, and mechanical and physical performance improves greatly, overcome such as shortcomings such as creep resistant, rigidity deficiencies, makes it to become a kind of plastics variety of high comprehensive performance.The production method of crosslinked polyethylene has physical method and chemical method, and industrial production has crosslinking with radiation, chemical crosslinking and three kinds of methods of warm water crosslinking.The present invention is that the employing gamma-rays width of cloth injects capable cross-linking modified, injection molding pipe fitting behind crosslinking with radiation can produce good Memorability, has good convergent force when recovering reset condition again after the moulding pipe fitting is expanded, pipe fitting after the modification is expanded the back gluing and is product, and Fig. 1 is seen in technological process.
Manufacture method:
1, technical recipe:
Polyvinyl resin 100%
Carbon black 0.02～0.15% (optimised quantity 0.06～0.08%)
Calcium stearate 0.005～0.02% (optimised quantity 0.01%)
Oleamide 0.005～0.02% (optimised quantity 0.01%)
Antioxidant 1010 0.005～0.5% (optimised quantity 0.15～0.25%)
Zinc oxide 0.001～0.003% (optimised quantity 0.01%)
Sensitizer (SCl
2) 2～10% (optimised quantities 5%)
2, manufacture process:
Polyvinyl resin and various auxiliary agent are mixed by a certain percentage, the material that mixes is sent into the hopper of plastic-injection moulding machine, through injection (mo(u)lding) machine the material of fusing is injected the thermally shrinking pipe mold cavity, after cooling, stereotyped pipe fitting is taken out in die sinking.Stereotyped pipe fitting is placed on the width of cloth penetrates in the storehouse that to inject row with the gamma-rays width of cloth cross-linking modified, the gamma-rays width of cloth amount of penetrating is 10～60KGY, the best width of cloth amount of penetrating 12～40KGY, the width of cloth is penetrated 72～96 hours time, also can suitably regulate the width of cloth amount of penetrating and the width of cloth is penetrated the time according to the pressure that product bore.Adopt the air-blowing mode to expand crosslinked good pipe fitting, be will be in advance in baking box (100～140 ℃) thermoplastic pipe fitting be placed in the inflation mould, again air bag is put into pipe fitting, close up mould, open air valve and carry out the air-blowing expansion, and then use the cold water cooling and shaping.Also can adopt mechanical system expansion, be with in advance in baking box (100～140 ℃) thermoplastic pipe fitting be placed in the inflation mould, on forcing press, be expanded to required size, and then use the cold water cooling and shaping.The pipe fitting of cooling and shaping carries out inwall gluing (PUR), and PUR is used as thermally shrinking pipe sealing and fills up agent, plays bonding under the powerful convergent force effect of thermally shrinking pipe and fills up effect.Earlier PUR is placed during gluing and be heated to 160～170 ℃ in the container, treat to spread upon pipe fitting inner wall after the glue fusing, the thickness of glued membrane is 0.1～0.4mm, and airing is finished product.
The thermally shrinking pipe profile is the waist drum shape, also can be long tubular or two ends is tapered long tubular.Pipe fitting two ends wall thickness is to be connected 0.6～0.8 times of plastic tube wall thickness, and pipe fitting middle part wall thickness is 1.2～1.5 times of two ends wall thickness, and the length of pipe fitting is to be connected 1.3～2.2 times of plastic tube caliber.The thermally shrinking pipe profile also can be made other arbitrary shape as required.
Through the thermally shrinking pipe that above-mentioned cross-linking modified PROCESS FOR TREATMENT processes, be used for plastic tube and steel pipe, plastic tube and cast iron pipe be connected and during the connection of pipes such as the distortion of tubing interface, overproof, reducing, the flexible that pipe connects is good, can embrittlement; Good corrosion resistance can anti-most of acid, alkali and chemicals; Can not go mouldy and breed bacteria, not contain harmful ingredients.Meet PDA (no oxious component detects) standard fully; Resistance to pressure is good, can be made into the different size requirement height (more than the 40kg), in (16～40kg), low (16kg following) die pressing product, pressure-bearing and sealing property can satisfy or surpass the desired pressure bearing and seal standard of plastic pipe of different cultivars, all size; Memory effect is preferably arranged; Temperature tolerance is good, the highest can be anti-110 ℃, minimum can be anti--70 ℃; Environmental cracking and creep resistance are good, and service life, expection can reach more than 50 years; Light weight, density are little, easy for installation.What during use " thermally shrinking pipe " be enclosed within wiped clean is connected the plastic tube docking site, heat equably repeatedly at " thermally shrinking pipe " surperficial upper edge axis direction with special-purpose heating tool, heating-up temperature is 160 ℃～240 ℃ (optimum temperature is 170 ℃～200 ℃), when seamless until between pipe fitting and connected tube, pipe fitting and connected tube tightly adhere to each other, stop heating.The pipe fitting that is heated is cooling gradually after stopping heating, and the powerful convergent force of generation makes pipe fitting and plastic tube be shrunk to one, and two pipes are firmly connected.The job site has non-transformer all can construct.Available dedicated heating grilled gun when electricity is arranged can not heat with blowtorch or welding torch when having electricity.
This product cost is lower, only is 1/3～1/10 of like product.
Description of drawings:
Fig. 1: thermally shrinking pipe manufacturing approach craft flow process
Embodiment:
Embodiment 1, pipe fitting mixing by required prescription, that injection moulding is good is penetrated with the gamma-rays width of cloth, the width of cloth amount of penetrating is 12KGY, and the width of cloth is penetrated 72 hours time, and the air-blowing mode is expanded, coating glue film 0.1mm, and pressure-bearing test (16kg), test pressure: 21kg does not have leakage.
Embodiment 2, pipe fitting mixing by required prescription, that injection moulding is good is penetrated with the gamma-rays width of cloth, the width of cloth amount of penetrating is 60KGY, and the width of cloth is penetrated 96 hours time, the mechanical system expansion, and coating glue film 0.4mm, pressure-bearing test (40kg), test pressure: 50kg does not have leakage.
Embodiment 3, pipe fitting mixing by required prescription, that injection moulding is good is penetrated with the gamma-rays width of cloth, the width of cloth amount of penetrating is 23KGY, and the width of cloth is penetrated 90 hours time, and the air-blowing mode is expanded, coating glue film 0.3mm, and pressure-bearing test (16kg), test pressure: 24kg does not have leakage.
Embodiment 4, pipe fitting mixing by required prescription, that injection moulding is good is penetrated with the gamma-rays width of cloth, the width of cloth amount of penetrating is 40KGY, and the width of cloth is penetrated 92 hours time, and the air-blowing mode is expanded, coating glue film 0.4mm, and pressure-bearing test (40kg), test pressure: 49kg does not have leakage.
Embodiment 5, pipe fitting mixing by required prescription, that injection moulding is good is penetrated with the gamma-rays width of cloth, the width of cloth amount of penetrating is 10KGY, and the width of cloth is penetrated 80 hours time, and the air-blowing mode is expanded, coating glue film 0.1mm, and pressure-bearing test (16kg), test pressure: 21kg does not have leakage.
Claims (4)
- A kind of manufacture method of thermally shrinking pipe1, a kind of is the manufacture method of the thermal contraction type pipe fitting of raw material with the polyethylene adding assistant, it is characterized in that: it is cross-linking modified that stereotyped pipe fitting injects row with the gamma-rays width of cloth, and the gamma-rays width of cloth amount of penetrating is 10～60KGY, and the width of cloth time of penetrating is 72～96 hours.
- 2, " a kind of is the manufacture method of the thermal contraction type pipe fitting of raw material with the polyethylene adding assistant " according to claim 1, it is characterized in that: it is 12～40KGY that the gamma-rays width of cloth is penetrated the best width of cloth amount of penetrating.
- 3, according to claim 1,2 described " a kind of is the manufacture method of the thermal contraction type pipe fitting of raw material with the polyethylene adding assistant ", it is characterized in that: pipe connects the hot melt adhesive film that inwall scribbles 0.1～0.4mm.
- 4, according to claim 1,2,3 described " a kind of is the manufacture method of the thermal contraction type pipe fitting of raw material with the polyethylene adding assistant ", it is characterized in that: pipe fitting adopts the air-blowing mode to expand, and also can adopt the mechanical system expansion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00122353 CN1294962A (en) | 2000-08-22 | 2000-08-22 | Manufacture of thermally shrinking pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00122353 CN1294962A (en) | 2000-08-22 | 2000-08-22 | Manufacture of thermally shrinking pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1294962A true CN1294962A (en) | 2001-05-16 |
Family
ID=4589206
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00122353 Pending CN1294962A (en) | 2000-08-22 | 2000-08-22 | Manufacture of thermally shrinking pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1294962A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100354989C (en) * | 2005-09-01 | 2007-12-12 | 赵成刚 | Environmental protection type fire retardant thermal shrinkage tube without halogen |
-
2000
- 2000-08-22 CN CN 00122353 patent/CN1294962A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100354989C (en) * | 2005-09-01 | 2007-12-12 | 赵成刚 | Environmental protection type fire retardant thermal shrinkage tube without halogen |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |