CA1045056A - Coiled tubing - Google Patents
Coiled tubingInfo
- Publication number
- CA1045056A CA1045056A CA242,641A CA242641A CA1045056A CA 1045056 A CA1045056 A CA 1045056A CA 242641 A CA242641 A CA 242641A CA 1045056 A CA1045056 A CA 1045056A
- Authority
- CA
- Canada
- Prior art keywords
- coiled tube
- coiled
- tube
- range
- molecular weight
- Prior art date
- 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.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
- F16L3/01—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets for supporting or guiding the pipes, cables or protective tubing, between relatively movable points, e.g. movable channels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L11/00—Hoses, i.e. flexible pipes
- F16L11/04—Hoses, i.e. flexible pipes made of rubber or flexible plastics
- F16L11/06—Hoses, i.e. flexible pipes made of rubber or flexible plastics with homogeneous wall
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Coiled tubing formed of a heat-softened, reset material having low cold flow characteristics, and high elastic memory characteristics. The tubing retains its elastic characteristics over a wide temperature range so as to provide improved coil characteristics as compared to conventional material such as rubber.
Coiled tubing formed of a heat-softened, reset material having low cold flow characteristics, and high elastic memory characteristics. The tubing retains its elastic characteristics over a wide temperature range so as to provide improved coil characteristics as compared to conventional material such as rubber.
Description
~L(345056 COILED' T~BrN~
..... ...... ...... ...... .... ' ,, ''BAC:K~ROUND''OT 'T~:INVE~TI'ON ~' Field of the :Inve:nt~on . . ~
This invention relates to coiled tubing and in particular to self-supporting coiled tubing.
Description of t'~e Prior'Art . :.
In the Marvin E. Holmgren United States Letters Patent 3,454,695, owned by the assignee hereof, an improved method of forming a coiled plastic hose is di.sclosed for pro-viding a self-supporting nylon tube. More specifically, as disclosed in said patent, the tube is formed of nylon 11 (11- .' amino undecanoic acid).
Such coiled hose has conventionally been formed of nylon as taught in the Rodgers United States Letters Patent 3,021,871. As pointed out in that patent, it has been conven- ,'' tional.to provide such tubing with normally contacting convolu-tions, requiring relatively stiff or semirigid plastic materials thus ruling out plastic materials such as polyvinyl chloride, ' polyethylene, polystyrene, and the like. '~
Prior to the Rodgers development, Ralph E. Smith et al, in United States Letters Patent 2,905,194, disclosed the forming of coiled plastic hose of polyvinyl chloride. The Rodgers patent, in teaching that polyvinyl chloride is, in fact, unsatisfactory for such coiled hose, indicates that there is . .
. ,~
, .
~L~4~56 some ~uestion in the art as to ~hat materials are, in fact, satisfactory for use. .~
The Rodgers patent teaches the use of the nylon .
famil~ formed by condensation of dibasic acids such as tere- :
phthalic acids, with diamlnes. The Holmgren patent, to the contrary, teaches the use of nylon 11, which comprises 11 amino undecanoic acid.
SUMMARY OF THE INVENTION
The present invention comprehends an improved flex- .
ible coiled tube having improved cold flow characteristics, improved resilient memory characteristics, and improved elas-ticity over a wide temperature range while yet being formed of a relatively low cost material not heretofore considered ..
suitable for such use.
More specifically, the invention comprehends provid- :
ing such a coiled tube formed of a heat softened reset material which comprises the polycondensation product of at least one aromatic dicarboxylic acid having a molecular weight below 300 .
condensed with a polyalkylene ether glycol having a molecular weight of 400-6000 and at least one diol having a molecular weight below 250. . ~
Such coiled hose effectively comprises tubing formed .~ ~ .
of a plasticized polyethylene terephthalate in which an effec-tive small percentage of ethylene diol unit is replaced by .;~
polymer glycols. :~.
Further more specifically~ the illustrated coiled tube has a Scale D durometer hardness in the range of approxi-mately 44 to 63. Further more specifically, the illustrated coiled tube may have an elongation at break in the range of approximately 500 -to 800.
Still fur-ther more specifically, the illustrated ~:
,~.
~ , - ~ coiled tube may have a flex modulus of 7000 -to 60,000.
~ 5~5~;
B~ F DES~R~Ip-T,~ON~O~ T~` D~ G
Other ~eatur~s and advanta~es~of the ~nYent~on w;i~ll be apparent from th~e ~ollowl`ng descx~pti~on taken in connec-tion w~th the accompany~ng drawing ~here~n: -FI~RE 1 ~s a schemati~c elevat~on of an apparatus for forming a coiled plastic tube eT~ody~-`ng the l`nvention; and FIOEURE 2 is a broken elevation of a coiled tube embodying the invention having fittings connected to opposite ends thereof and mounted in an air supply system.
DESCRIPTION OF T~IE PREFERRED EM~O'D'IMENT
In the exemplary embodiment of the invention as disclosed in the draw~ng, a coiled tube generally designated 10 is shown to comprise a tube which may be formed by a method similar to that of the above-identified Holmgren patent No.
3,454,695 to have a preselected helical configuration as a result of setting the tube subsequent to a heat softening thereof.
Thus, as shown in Figure 1, the tube originally may be formed as by extrusion from an extruder 11 and a suitable elevated temperature, such as approximately 500F. The extruded tubing is firstly passed through a cooling device 12 and drawn therethrough by a haul off device 13, then coiled and allowed to cool to ambient temperatures such as for storage.
The tubing may be delivered from the coil to a heating apparatus 14 to raise the temperature of the tubing to an ,, annealing temperature suitably for permitting facilitated formation of the tube in the desired helical configuration by means of a plurality of guide rollers 15. The helical coil ~', is then set by cooling thereof while the coil is supported on ,~
suitable rollers 16. The guide xollers 15 and support rollers 16 are driven through suitable gearing 17 from a transmission 18, in turn driven by a drive motor 19.
`.' , _3_ ~
!.' , :: : .' , : ' '' ., ' : ' ' . ' ' 50~i~
The present invent~on comprehends ~oxming t~e tube 10 of a polyester el~s-~omer. Polyesters~ haYe long had the dis-adva~t~ge of shrl`nkage and dropout of res~n after a per~od of agi~ng as a result of conti~nuous curl`ng. ~mproved polyes-ter resi~ns-are continuously Be~ng prov~ded but ~eretofore, the use of polyesters has been generall~ contra~ndi~cated in applications such as coiled tubi`ng for a number o~ reasons includ~ng those generally discussed in the above identified Rodgers patent.
It has been found, however, that a polyester resin comprising a plasti~cized polyethylene terephthalate i`n which an effective small percentage of ethylene diol unit is replaced by polymer glycols, provides an i`mproved coi`led hose construction.
More specifically, the improved tube forming material comprises a coiled flexible tube formed of a heat-softened ~ :
reset material comprising the polycondensation product of at -least one aromatic dicarboxylic acid having a molecular weight ~ :~
below 300 condensed with a polyalkylene ether glycol having a `
molecular weight of 400-6000 and at least one diol having a molecular weight below 250. An example of such a polyester elastomer is that sold by E. I. duPont deNemours & CoO under the trademark HYTREL. Broadly, the HYTREL polyester material comp~ises a fully polymerized, high molecular weight, non-reactive thermoplastic. While such polymers are available having different hardness characteristics in the preferred embodi.ment, the scale D durometer hardness is ln the range of approximately 44 to 63. The polyester elastomer material herein may be extruded at temperatures in the range of approximately 350 to 700 F. and do not require post-curing to provide full strength and dimensional stabili`ty.
The polyester elastomer is selected for resistance ~gLSQ56 to diss~lution by polar solvents so as to resist s~7elling and permeation by ~uch solvents and fuels. The polyester eiasto-mer herein is preferably highly resi.stant to flexing over a wide tempera-ture range. Preferably, the ela~tomer xemain~ not brittle at te~peratures down to 90 F . with only a small lncrease in stiffness at temperatures as low as -65~F. The elastomer herein may be selected to have relatively high hot strength at tempexatures of 300D F and above, as desired.
The ela~tomer is highly re~i~tant to flex cut ~rowth over a wide temperature range.
The polyester elastomer herein has a relatively high l~ad bearing capacity whereby the thickness of the tube ~all may be minimized for a given pressure load. More speci-fically, the polyester elastomer herein e~shibits high Young's Moduli in tension, compression, and flexural modes.
The polyestex ela~tomer of the present invention has a relatively low creep rate, which is defined by the ap-parent modulus.
The polyester elastomer tubing o~ the presen-t inven-tion provides a highly desirable improvement o~er tubing, such asnylon ll tubing, in avoiding an increase in the Young's Moduli as a consequence of los3 o~ plasticixer at high temperatures~
More specifically, the polyester elastomer o the present invention avoids use of volatile plasticizexs and, thu~, maintains it elasticity notwlthstanding suhjection of the tu~ing to relatively high ~emparatures for protracted periods of timeO
The preferred polye~ter elastomer herein has an elongation at break point in the range o approximately 500 to 800 and a flex modulus in the range of 7000 to 60,000. As the polymer need not be cured, it is im~ediately available or ~L~45()S6 use and does not change in its characteristics over long periods of time as occurs in conventional nylon polymers and the like.
It has been found that the cold flow and memory c~aracteristics of such polyester elas~omers are substan-tially improved ovor that o~ nylon, and as such polyester elastomers > are relatively low in cost, provide a further advan~age over the heretofore conventional coiled ~ubing materials. :~
A shown in the drawing, the coiled tube may be pro-vided with a fitting 20 and a fitting Zl at the opposite end 10 ~or connecti~g a tool, such as an air noæzle 22, to an alr pressure supply duct 23. As indicated in Flgure 2, ~he poly-ester elastomeric hose i~ salf-suppoxting in carrying the tool in an elevatea dispo~ition while yet permitting movement o~
" ".
the tool by the u~er by ex!:~ension of the coilecl tube, as de- ;
si~ed. The improved coiled tube provides a longr trouble-~xee life o~ such a structure providing the above discussed highly desira~le advanta~es of previous coiled tube structures utilizing nylon and the like.
The inventive concept herein may be utilized not only ~0 in the farmation o~ nonrein~orced tubing, as discussecl above, but also in the formation of reinforced tubing, or hose. Thus, a suitable braid may be provided about the tube and provided with an outer cover or shea~h prior to the delivery thereof to khe heating apparatus 1~. Illustra~ively, the braid may comprise conventional polyester braid. ~The outer sheakh may be ~ormed of Hytrel polyester ma~erial, which ~ay be ex- ;
truded about the braid covered core in a conventional manner.
. The ~oregoing disclosure of speci~c embodiments is illustrative of the broad inventive concepts comprehended by 30 the in~entio~
'
..... ...... ...... ...... .... ' ,, ''BAC:K~ROUND''OT 'T~:INVE~TI'ON ~' Field of the :Inve:nt~on . . ~
This invention relates to coiled tubing and in particular to self-supporting coiled tubing.
Description of t'~e Prior'Art . :.
In the Marvin E. Holmgren United States Letters Patent 3,454,695, owned by the assignee hereof, an improved method of forming a coiled plastic hose is di.sclosed for pro-viding a self-supporting nylon tube. More specifically, as disclosed in said patent, the tube is formed of nylon 11 (11- .' amino undecanoic acid).
Such coiled hose has conventionally been formed of nylon as taught in the Rodgers United States Letters Patent 3,021,871. As pointed out in that patent, it has been conven- ,'' tional.to provide such tubing with normally contacting convolu-tions, requiring relatively stiff or semirigid plastic materials thus ruling out plastic materials such as polyvinyl chloride, ' polyethylene, polystyrene, and the like. '~
Prior to the Rodgers development, Ralph E. Smith et al, in United States Letters Patent 2,905,194, disclosed the forming of coiled plastic hose of polyvinyl chloride. The Rodgers patent, in teaching that polyvinyl chloride is, in fact, unsatisfactory for such coiled hose, indicates that there is . .
. ,~
, .
~L~4~56 some ~uestion in the art as to ~hat materials are, in fact, satisfactory for use. .~
The Rodgers patent teaches the use of the nylon .
famil~ formed by condensation of dibasic acids such as tere- :
phthalic acids, with diamlnes. The Holmgren patent, to the contrary, teaches the use of nylon 11, which comprises 11 amino undecanoic acid.
SUMMARY OF THE INVENTION
The present invention comprehends an improved flex- .
ible coiled tube having improved cold flow characteristics, improved resilient memory characteristics, and improved elas-ticity over a wide temperature range while yet being formed of a relatively low cost material not heretofore considered ..
suitable for such use.
More specifically, the invention comprehends provid- :
ing such a coiled tube formed of a heat softened reset material which comprises the polycondensation product of at least one aromatic dicarboxylic acid having a molecular weight below 300 .
condensed with a polyalkylene ether glycol having a molecular weight of 400-6000 and at least one diol having a molecular weight below 250. . ~
Such coiled hose effectively comprises tubing formed .~ ~ .
of a plasticized polyethylene terephthalate in which an effec-tive small percentage of ethylene diol unit is replaced by .;~
polymer glycols. :~.
Further more specifically~ the illustrated coiled tube has a Scale D durometer hardness in the range of approxi-mately 44 to 63. Further more specifically, the illustrated coiled tube may have an elongation at break in the range of approximately 500 -to 800.
Still fur-ther more specifically, the illustrated ~:
,~.
~ , - ~ coiled tube may have a flex modulus of 7000 -to 60,000.
~ 5~5~;
B~ F DES~R~Ip-T,~ON~O~ T~` D~ G
Other ~eatur~s and advanta~es~of the ~nYent~on w;i~ll be apparent from th~e ~ollowl`ng descx~pti~on taken in connec-tion w~th the accompany~ng drawing ~here~n: -FI~RE 1 ~s a schemati~c elevat~on of an apparatus for forming a coiled plastic tube eT~ody~-`ng the l`nvention; and FIOEURE 2 is a broken elevation of a coiled tube embodying the invention having fittings connected to opposite ends thereof and mounted in an air supply system.
DESCRIPTION OF T~IE PREFERRED EM~O'D'IMENT
In the exemplary embodiment of the invention as disclosed in the draw~ng, a coiled tube generally designated 10 is shown to comprise a tube which may be formed by a method similar to that of the above-identified Holmgren patent No.
3,454,695 to have a preselected helical configuration as a result of setting the tube subsequent to a heat softening thereof.
Thus, as shown in Figure 1, the tube originally may be formed as by extrusion from an extruder 11 and a suitable elevated temperature, such as approximately 500F. The extruded tubing is firstly passed through a cooling device 12 and drawn therethrough by a haul off device 13, then coiled and allowed to cool to ambient temperatures such as for storage.
The tubing may be delivered from the coil to a heating apparatus 14 to raise the temperature of the tubing to an ,, annealing temperature suitably for permitting facilitated formation of the tube in the desired helical configuration by means of a plurality of guide rollers 15. The helical coil ~', is then set by cooling thereof while the coil is supported on ,~
suitable rollers 16. The guide xollers 15 and support rollers 16 are driven through suitable gearing 17 from a transmission 18, in turn driven by a drive motor 19.
`.' , _3_ ~
!.' , :: : .' , : ' '' ., ' : ' ' . ' ' 50~i~
The present invent~on comprehends ~oxming t~e tube 10 of a polyester el~s-~omer. Polyesters~ haYe long had the dis-adva~t~ge of shrl`nkage and dropout of res~n after a per~od of agi~ng as a result of conti~nuous curl`ng. ~mproved polyes-ter resi~ns-are continuously Be~ng prov~ded but ~eretofore, the use of polyesters has been generall~ contra~ndi~cated in applications such as coiled tubi`ng for a number o~ reasons includ~ng those generally discussed in the above identified Rodgers patent.
It has been found, however, that a polyester resin comprising a plasti~cized polyethylene terephthalate i`n which an effective small percentage of ethylene diol unit is replaced by polymer glycols, provides an i`mproved coi`led hose construction.
More specifically, the improved tube forming material comprises a coiled flexible tube formed of a heat-softened ~ :
reset material comprising the polycondensation product of at -least one aromatic dicarboxylic acid having a molecular weight ~ :~
below 300 condensed with a polyalkylene ether glycol having a `
molecular weight of 400-6000 and at least one diol having a molecular weight below 250. An example of such a polyester elastomer is that sold by E. I. duPont deNemours & CoO under the trademark HYTREL. Broadly, the HYTREL polyester material comp~ises a fully polymerized, high molecular weight, non-reactive thermoplastic. While such polymers are available having different hardness characteristics in the preferred embodi.ment, the scale D durometer hardness is ln the range of approximately 44 to 63. The polyester elastomer material herein may be extruded at temperatures in the range of approximately 350 to 700 F. and do not require post-curing to provide full strength and dimensional stabili`ty.
The polyester elastomer is selected for resistance ~gLSQ56 to diss~lution by polar solvents so as to resist s~7elling and permeation by ~uch solvents and fuels. The polyester eiasto-mer herein is preferably highly resi.stant to flexing over a wide tempera-ture range. Preferably, the ela~tomer xemain~ not brittle at te~peratures down to 90 F . with only a small lncrease in stiffness at temperatures as low as -65~F. The elastomer herein may be selected to have relatively high hot strength at tempexatures of 300D F and above, as desired.
The ela~tomer is highly re~i~tant to flex cut ~rowth over a wide temperature range.
The polyester elastomer herein has a relatively high l~ad bearing capacity whereby the thickness of the tube ~all may be minimized for a given pressure load. More speci-fically, the polyester elastomer herein e~shibits high Young's Moduli in tension, compression, and flexural modes.
The polyestex ela~tomer of the present invention has a relatively low creep rate, which is defined by the ap-parent modulus.
The polyester elastomer tubing o~ the presen-t inven-tion provides a highly desirable improvement o~er tubing, such asnylon ll tubing, in avoiding an increase in the Young's Moduli as a consequence of los3 o~ plasticixer at high temperatures~
More specifically, the polyester elastomer o the present invention avoids use of volatile plasticizexs and, thu~, maintains it elasticity notwlthstanding suhjection of the tu~ing to relatively high ~emparatures for protracted periods of timeO
The preferred polye~ter elastomer herein has an elongation at break point in the range o approximately 500 to 800 and a flex modulus in the range of 7000 to 60,000. As the polymer need not be cured, it is im~ediately available or ~L~45()S6 use and does not change in its characteristics over long periods of time as occurs in conventional nylon polymers and the like.
It has been found that the cold flow and memory c~aracteristics of such polyester elas~omers are substan-tially improved ovor that o~ nylon, and as such polyester elastomers > are relatively low in cost, provide a further advan~age over the heretofore conventional coiled ~ubing materials. :~
A shown in the drawing, the coiled tube may be pro-vided with a fitting 20 and a fitting Zl at the opposite end 10 ~or connecti~g a tool, such as an air noæzle 22, to an alr pressure supply duct 23. As indicated in Flgure 2, ~he poly-ester elastomeric hose i~ salf-suppoxting in carrying the tool in an elevatea dispo~ition while yet permitting movement o~
" ".
the tool by the u~er by ex!:~ension of the coilecl tube, as de- ;
si~ed. The improved coiled tube provides a longr trouble-~xee life o~ such a structure providing the above discussed highly desira~le advanta~es of previous coiled tube structures utilizing nylon and the like.
The inventive concept herein may be utilized not only ~0 in the farmation o~ nonrein~orced tubing, as discussecl above, but also in the formation of reinforced tubing, or hose. Thus, a suitable braid may be provided about the tube and provided with an outer cover or shea~h prior to the delivery thereof to khe heating apparatus 1~. Illustra~ively, the braid may comprise conventional polyester braid. ~The outer sheakh may be ~ormed of Hytrel polyester ma~erial, which ~ay be ex- ;
truded about the braid covered core in a conventional manner.
. The ~oregoing disclosure of speci~c embodiments is illustrative of the broad inventive concepts comprehended by 30 the in~entio~
'
Claims (12)
1. A flexible coiled tube formed of a heat softened reset material comprising the polycondensation product of at least one aromatic dicarboxylic acid having a molecular weight below 300 condensed with a polyalkylene ether glycol having a molecular weight of 400-6000 and at least one diol having a molecular weight below 250.
2. The coiled tube of Claim 1 wherein the scale D
durometer hardness of said material is in the range of approximately 44 to 63.
durometer hardness of said material is in the range of approximately 44 to 63.
3. The coiled tube of Claim 1 wherein the elongation of said material at break is in the range of approximately 500-800.
4. The coiled tube of Claim 1 wherein said material.
has a flex modular of 7000-60,000.
has a flex modular of 7000-60,000.
5. A flexible coiled tube formed of a heat softened reset material comprising a plasticized polyethylene tere?
phthalate in which an effective small percentage of ethylene diol unit is replaced by polymer glycols.
phthalate in which an effective small percentage of ethylene diol unit is replaced by polymer glycols.
6. The coiled tube of Claim 5 wherein the scale D
durometer hardness of said material is in the range of approxi-mately 44 to 63.
durometer hardness of said material is in the range of approxi-mately 44 to 63.
7. The coiled tube of Claim 5 wherein the elongation of said material at break is in the range of approximately 500-800.
8. The coiled tube of Claim 5 wherein said material has a flex modulus of 7000-60,000.
9. The coiled tube of Claim 1 having a reinforcing braid provided about the outer surface thereof and a sheath covering the braid.
10. The coiled tube of Claim 9 wherein the sheath is formed of Hytrel.
11. The coiled tube of Claim 5 having a reinforcing braid provided about the outer surface thereof and a sheath covering the braid.
12. The coiled tube of Claim 11 wherein the sheath is formed of Hytrel.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US55254675A | 1975-02-24 | 1975-02-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1045056A true CA1045056A (en) | 1978-12-26 |
Family
ID=24205797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA242,641A Expired CA1045056A (en) | 1975-02-24 | 1975-12-29 | Coiled tubing |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS51101222A (en) |
| AU (1) | AU509004B2 (en) |
| BR (1) | BR7600577A (en) |
| CA (1) | CA1045056A (en) |
| GB (1) | GB1518424A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6443283U (en) * | 1987-09-10 | 1989-03-15 | ||
| DE3943189C2 (en) * | 1988-12-29 | 1995-09-14 | Inventa Ag | Process for the production of coils |
| DE102020007133A1 (en) | 2020-11-23 | 2022-05-25 | Truplast Kunststofftechnik Gesellschaft mit beschränkter Haftung | METHOD AND DEVICE FOR PRODUCTION OF A COIL FROM A THERMOPLASTIC PLASTIC |
-
1975
- 1975-12-29 CA CA242,641A patent/CA1045056A/en not_active Expired
- 1975-12-31 AU AU87984/75A patent/AU509004B2/en not_active Expired
-
1976
- 1976-01-26 JP JP741276A patent/JPS51101222A/en active Pending
- 1976-01-30 BR BR7600577A patent/BR7600577A/en unknown
- 1976-02-12 GB GB561876A patent/GB1518424A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| BR7600577A (en) | 1976-09-14 |
| GB1518424A (en) | 1978-07-19 |
| JPS51101222A (en) | 1976-09-07 |
| AU8798475A (en) | 1977-07-07 |
| AU509004B2 (en) | 1980-04-17 |
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