CA1065568A - Apparatus and method for forming water stops on insulated pipe - Google Patents
Apparatus and method for forming water stops on insulated pipeInfo
- Publication number
- CA1065568A CA1065568A CA278,821A CA278821A CA1065568A CA 1065568 A CA1065568 A CA 1065568A CA 278821 A CA278821 A CA 278821A CA 1065568 A CA1065568 A CA 1065568A
- Authority
- CA
- Canada
- Prior art keywords
- workpiece
- passage
- flap
- coating
- diameter
- 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
Landscapes
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE: Apparatus usable in combination with means for extruding a waterproof plastic sheath on foam coating on the exterior of pipe, for reducing the diameter of the plastic sheath adjacent the pipe section ends to conform to the beveled end surfaces of the foam coating and adjacent protruding marginal portions of the pipe surface and thereby form a water stop excluding moisture from the foam thus enclosed by the plastic sheath.
Description
~6~5~8 The Inventio~ relate~ to apparatuæ and method of coating pipe and conci~ts particularly in means or apply-ing a moi~ture seal to the transver~e end ~rfaces of foam coatings on pipes.
According ~o the invention there i8 provlded apparatu~ for applyi~g a continuou~ coating to al~ernating full and reduced diameter portions of cyll~drical suraces of an elongated ~orkpleee comprising m~an~ forming a cylindrical pa~sage of larger diameter than the workpiece to pe~mit ~he pas~age of the work ~her~t~rou~h, an extrwsio~
die forming the outlet of said pas~age, an annular outl~t orifice i~ said extr~sion die for extruding the coating on ~aid workpiece a~ the latter pa~se~ out of said die, said pas8age ha~i~g a flexible annular flap on it~ anter~or e~d : seall~gly engageable wi~h the cylindrical surface of the workp~ece to for~, with the exterior ~urface of the workp~ece, said cylindr~cal passage, and th~ annular portio~ of the coating betwee~ the die o~tlet a~d the workpiece, a prlm~ry vacuu~ cha~ber, a vacuum ~ource, co~duit mea~ con~ec~ing sait primary vacuum cha~ber to 8aid vacuum ~ource, ~eans :formlng an addit~onal pa~3age o~ larger diam~ter than the workpiece and at lea~t as long as the reduced diam~ter portions of the ~rkpiece aligned ~ith said cyli~drical pa8~age anterior to said fl~xible a~nular flap ~nd having a similar ~lap on it~ anterior end to form, wi~h the ex~erior surface of ~aid workp~ece, said additional pa~age, and said fir~t-~amed flap, a ~econdary vacu~ chamber, a~d conduit ~.~
~ 6 556 8 means connecting said secondary vacuum chamber to said vacuum source.
In the acco~panying drawi~
FIG. 1 is a side elevational vie~w ~f apparatus constructed accordi~g ~o the invention.
FIG. 2 ~s an enlarged longitudin,al diametral sectional view taken along llne 2-2 o~ FIG. 5 ~howing the pipe coating ia lo~gitudinal cross section.
FIG. 3 i~ a longitudinal diametr~l sec~io~al view LO corr~spo~dl~ to FIG. 2 but showi~g t~e exterior of the pipe.
FIGS. 4 a~d 5 are transverse vertical sectional views taken re8pectlvely al~g li~es 4-4 and 5-5 o~ FIG. 3.
The nun~ral 1 denotes an ex~rusion die having a~
an~ular pas~age 2 for the extrusio~ ~herefr~ of ~olte~
pla~tic ma~erial ~ ~nd a central cyli~drical pa3sa~ewa~ 3 of su~flciene di~ter ~o permit the pa~sage of ali~ed ~etal pipe sections P co~ted with polyurethane oam in~ulatio~
F except ~t their abutting end~ where in~ulation F i~ cut back o~ a bevel B, lca~ing several i~che~ of the ~d of each pipe ~urface exposed a~ at S.
Anterior ta e~trusio~ die 1 wit~ re~pec~ to ~he direction of pipe travel there~hrough~ a fir~ cyli~drical wall ~ctio~ S ia a~tached to the i~let face 7 of die 1 by a~ a~lar ~la~ge 9 and a similar flan~e 11 at ~he re~ te end of wall ~ectlon 5 mounts an in~ardly positioned a~nular fl~p 13 of elastomeric m~t~rial, pref~rably gu~ rubber hav~g ~ L~6556~
a central circular aperture of suf~icient dialaeter to permit passage of ~he pipe with fo~ coating F throu~h lt while ~ealing,ly e~aging the ou1:er surface of ~oa~ coating F ~o ~18 to definc, wlth cyli~adric~l wall 5 and the passageway 3 iR die 1, a ~enerally an~ular primary vacuum cha~bber, the forward end of whlch is closed by the imler sur~Eace c~f plas-tic ~heath or outer eoatin~ C as it i.8 extruded fro~ dle 1 on ~he outer surace of ~oam ooatin~, F.
A co~duit 15 connect~ the chaibber surrowlded by 10 cyli~dric:al wall section 5 to a vacuum ~ource, to pro~ide a ~uficieat depre~ion in the chamber to draw plastle coating C radially inwardly toward pipe P i~ ~he beveled regloll B
and cut-away end sec~io~s S which, alo~ with ~he ou~er 8Ur-face of foa~ F, have been pr~viou~ly covered wlth D~a~tlc A, except for a ~rgia pr~ferably of about four irlche~ a~ the abu~tiIlg pipe e~d~, which are covered with tape T to preve~t tha adherence o~ the plas~ic coa~ g to tl~e pipe end aTId ~acil~tate the removal of the pla~tic cl~at~g from the end portioa of the pipe ~urface. A vacuua gau~e 16 i8 D~unted on 20 wall section 5 tc facilitate determillati~ll of the amount of depression in the pr~aary vacuum cha~ber.
To ensure the m~intenance of a vacuu~ ~n the primary vacuu~ chaD~ber, a 8econdary vacuum chalbber i8 for~d ante~ior to ~eallng flap 13 and eompri~e~ a cyl~ndrlcal wall 17 ~ligh~ly longer than the cut-away por~ions o:E the ~oam F on ad~aceRt pipe s~etio~ oi~led to cyll~drical wall 15 by an arl~ular fla~lge 19 secured by bolt~ 21, pa88i~;1g through the ~ 65~68 outer peripheral mar~in o~ flap 13, to annular flange 11.
The entry and of the secondary vacuum cha~ber i8 formad by an annular :elange 23 ~1l wall 15 to which i~s clamped, by mean~
of a back-up ri~g 25, a second sealin~ flap 27 of the sallne form and con~truction a~ flap 13. The secl3~dary vacuum cha~ber ~urrounded by wall 17 i8 connec~ed by a co3ldu~t 29 to a source o~ vacuum~ and i8 al~o provided w;L~h a vacuuDI gauge 30.
Operation sf the device te~ ~pply irlte~ral water 0 8top8 ~;0 pipe sections P which has been coated with foaa~
il~sulation F b~veled as at B at it3 Qnds aT~d wlth the ou~er surface of insulation F including beveled portiorls B, along with the protrud~ng e~d~ o the pipe surface coated with ~stic A, i~ a~ foll~w~: A8 the line of pipe sections P
approache~ e~tru~io~ die 7 for appllcatioE~ of pla3tic cc~ating C, it passes through secondary and pr~ry ~acuulls chamber~
surrouIIded respecti~ely by cyllndrical wa~ls 17 and 5, the pre3erv~tioll o vacu~ in the primary cha~iber being ellsure~
by the vacu~m provided in the ~econdary cha~ber. ~ the 20 molten pla~t~c coati~ N being 2xtruded oTlto ~he outer Daagtic-coated ~urface of foam insula~ion C approaches ths beveled portiogl lil, the vacuw~ i~ the primary vacuum challiber draw~ the coating radlally inwardly s:tlto the ma~t~c-coated beveled surface B as at ~, over the expo~3ed ma~ic-coated p~rt~ S of the ~plpe e~d sect~ons a~d o~rer the taped ends T
of tha ad~ace~ pipe sec~ion.
The re~ultaRt pla~tic coating i~or~3 highly ef~s~ive ~ 4 --~0~;5568 water ~top~ W at eaeh end of the pipe which are ~ntegral with the exterior plastic coatin~ C o~ the outer cylindrical face o~ the foam insulation, thu~ eliD~ atiL~ the inconveni~
ence, time and expense of applyin~, separate water 8tQp8.
Satisfactory re~ults can be obtaiLned without the use of a second~ry chaliber i~ leng~h o ~he reduced diameter portions of ~he work are le88 tharl the length of th~ pri~ry chaDiber or if the diameter of the diLe passage~ay i8 only ~lightly grea~er ~han the outside diameter of the in~ulating 10 material.
According ~o the invention there i8 provlded apparatu~ for applyi~g a continuou~ coating to al~ernating full and reduced diameter portions of cyll~drical suraces of an elongated ~orkpleee comprising m~an~ forming a cylindrical pa~sage of larger diameter than the workpiece to pe~mit ~he pas~age of the work ~her~t~rou~h, an extrwsio~
die forming the outlet of said pas~age, an annular outl~t orifice i~ said extr~sion die for extruding the coating on ~aid workpiece a~ the latter pa~se~ out of said die, said pas8age ha~i~g a flexible annular flap on it~ anter~or e~d : seall~gly engageable wi~h the cylindrical surface of the workp~ece to for~, with the exterior ~urface of the workp~ece, said cylindr~cal passage, and th~ annular portio~ of the coating betwee~ the die o~tlet a~d the workpiece, a prlm~ry vacuu~ cha~ber, a vacuum ~ource, co~duit mea~ con~ec~ing sait primary vacuum cha~ber to 8aid vacuum ~ource, ~eans :formlng an addit~onal pa~3age o~ larger diam~ter than the workpiece and at lea~t as long as the reduced diam~ter portions of the ~rkpiece aligned ~ith said cyli~drical pa8~age anterior to said fl~xible a~nular flap ~nd having a similar ~lap on it~ anterior end to form, wi~h the ex~erior surface of ~aid workp~ece, said additional pa~age, and said fir~t-~amed flap, a ~econdary vacu~ chamber, a~d conduit ~.~
~ 6 556 8 means connecting said secondary vacuum chamber to said vacuum source.
In the acco~panying drawi~
FIG. 1 is a side elevational vie~w ~f apparatus constructed accordi~g ~o the invention.
FIG. 2 ~s an enlarged longitudin,al diametral sectional view taken along llne 2-2 o~ FIG. 5 ~howing the pipe coating ia lo~gitudinal cross section.
FIG. 3 i~ a longitudinal diametr~l sec~io~al view LO corr~spo~dl~ to FIG. 2 but showi~g t~e exterior of the pipe.
FIGS. 4 a~d 5 are transverse vertical sectional views taken re8pectlvely al~g li~es 4-4 and 5-5 o~ FIG. 3.
The nun~ral 1 denotes an ex~rusion die having a~
an~ular pas~age 2 for the extrusio~ ~herefr~ of ~olte~
pla~tic ma~erial ~ ~nd a central cyli~drical pa3sa~ewa~ 3 of su~flciene di~ter ~o permit the pa~sage of ali~ed ~etal pipe sections P co~ted with polyurethane oam in~ulatio~
F except ~t their abutting end~ where in~ulation F i~ cut back o~ a bevel B, lca~ing several i~che~ of the ~d of each pipe ~urface exposed a~ at S.
Anterior ta e~trusio~ die 1 wit~ re~pec~ to ~he direction of pipe travel there~hrough~ a fir~ cyli~drical wall ~ctio~ S ia a~tached to the i~let face 7 of die 1 by a~ a~lar ~la~ge 9 and a similar flan~e 11 at ~he re~ te end of wall ~ectlon 5 mounts an in~ardly positioned a~nular fl~p 13 of elastomeric m~t~rial, pref~rably gu~ rubber hav~g ~ L~6556~
a central circular aperture of suf~icient dialaeter to permit passage of ~he pipe with fo~ coating F throu~h lt while ~ealing,ly e~aging the ou1:er surface of ~oa~ coating F ~o ~18 to definc, wlth cyli~adric~l wall 5 and the passageway 3 iR die 1, a ~enerally an~ular primary vacuum cha~bber, the forward end of whlch is closed by the imler sur~Eace c~f plas-tic ~heath or outer eoatin~ C as it i.8 extruded fro~ dle 1 on ~he outer surace of ~oam ooatin~, F.
A co~duit 15 connect~ the chaibber surrowlded by 10 cyli~dric:al wall section 5 to a vacuum ~ource, to pro~ide a ~uficieat depre~ion in the chamber to draw plastle coating C radially inwardly toward pipe P i~ ~he beveled regloll B
and cut-away end sec~io~s S which, alo~ with ~he ou~er 8Ur-face of foa~ F, have been pr~viou~ly covered wlth D~a~tlc A, except for a ~rgia pr~ferably of about four irlche~ a~ the abu~tiIlg pipe e~d~, which are covered with tape T to preve~t tha adherence o~ the plas~ic coa~ g to tl~e pipe end aTId ~acil~tate the removal of the pla~tic cl~at~g from the end portioa of the pipe ~urface. A vacuua gau~e 16 i8 D~unted on 20 wall section 5 tc facilitate determillati~ll of the amount of depression in the pr~aary vacuum cha~ber.
To ensure the m~intenance of a vacuu~ ~n the primary vacuu~ chaD~ber, a 8econdary vacuum chalbber i8 for~d ante~ior to ~eallng flap 13 and eompri~e~ a cyl~ndrlcal wall 17 ~ligh~ly longer than the cut-away por~ions o:E the ~oam F on ad~aceRt pipe s~etio~ oi~led to cyll~drical wall 15 by an arl~ular fla~lge 19 secured by bolt~ 21, pa88i~;1g through the ~ 65~68 outer peripheral mar~in o~ flap 13, to annular flange 11.
The entry and of the secondary vacuum cha~ber i8 formad by an annular :elange 23 ~1l wall 15 to which i~s clamped, by mean~
of a back-up ri~g 25, a second sealin~ flap 27 of the sallne form and con~truction a~ flap 13. The secl3~dary vacuum cha~ber ~urrounded by wall 17 i8 connec~ed by a co3ldu~t 29 to a source o~ vacuum~ and i8 al~o provided w;L~h a vacuuDI gauge 30.
Operation sf the device te~ ~pply irlte~ral water 0 8top8 ~;0 pipe sections P which has been coated with foaa~
il~sulation F b~veled as at B at it3 Qnds aT~d wlth the ou~er surface of insulation F including beveled portiorls B, along with the protrud~ng e~d~ o the pipe surface coated with ~stic A, i~ a~ foll~w~: A8 the line of pipe sections P
approache~ e~tru~io~ die 7 for appllcatioE~ of pla3tic cc~ating C, it passes through secondary and pr~ry ~acuulls chamber~
surrouIIded respecti~ely by cyllndrical wa~ls 17 and 5, the pre3erv~tioll o vacu~ in the primary cha~iber being ellsure~
by the vacu~m provided in the ~econdary cha~ber. ~ the 20 molten pla~t~c coati~ N being 2xtruded oTlto ~he outer Daagtic-coated ~urface of foam insula~ion C approaches ths beveled portiogl lil, the vacuw~ i~ the primary vacuum challiber draw~ the coating radlally inwardly s:tlto the ma~t~c-coated beveled surface B as at ~, over the expo~3ed ma~ic-coated p~rt~ S of the ~plpe e~d sect~ons a~d o~rer the taped ends T
of tha ad~ace~ pipe sec~ion.
The re~ultaRt pla~tic coating i~or~3 highly ef~s~ive ~ 4 --~0~;5568 water ~top~ W at eaeh end of the pipe which are ~ntegral with the exterior plastic coatin~ C o~ the outer cylindrical face o~ the foam insulation, thu~ eliD~ atiL~ the inconveni~
ence, time and expense of applyin~, separate water 8tQp8.
Satisfactory re~ults can be obtaiLned without the use of a second~ry chaliber i~ leng~h o ~he reduced diameter portions of ~he work are le88 tharl the length of th~ pri~ry chaDiber or if the diameter of the diLe passage~ay i8 only ~lightly grea~er ~han the outside diameter of the in~ulating 10 material.
Claims (9)
1. Apparatus for applying a continuous coating to alternating full and reduced diameter portions of cylindrical surfaces of an elongated workpiece comprising means forming a cylindrical passage of larger diameter than the workpiece to permit the passage of the work therethrough, an extrusion die forming the outlet of said passage, an annular outlet orifice in said extrusion die for extruding the coating on said work-piece as the latter passes out of said die, said passage having a flexible annular flap on its anterior end sealingly engageable with the cylindrical surface of the workpiece to form, with the exterior surface of the workpiece, said cylindrical passage, and the annular portion of the coating between the die outlet and the workpiece, a primary vacuum chamber, a vacuum source, conduit means connecting said primary vacuum chamber to said vacuum source, means forming an additional passage of larger diameter than the workpiece and at least as long as the reduced diameter portions of the workpiece aligned with said cylindrical passage anterior to said flexible annular flap and having a similar flap on its anterior end to form, with the exterior surface of said work-piece, said additional passage, and said first-named flap, a secondary vacuum chamber, and conduit means connecting said secondary vacuum chamber to said vacuum source.
2. Apparatus according to claim 1 wherein said secondary vacuum chamber comprises a peripheral wall struc-ture secured to said passage forming means anterior to said flap and having a similar flap on its anterior end, there being conduit means connecting said secondary vacuum chamber to a vacuum source.
3. Apparatus according to claim 2 wherein the opening in each of said annular flaps is of sufficient size to permit passage therethrough of the full diameter portions of the cylindrical member while sealingly engaging the sur-face thereof.
4. Apparatus according to claim 3 wherein each of said chambers mounts a vacuum gauge.
5. Apparatus according to claim 1 wherein said elongated workpiece comprises a plurality of aligned pipe sections each having a coating of insulation material terminating short of its ends by a conically beveled portion, leaving its end portions clear, the insulation-coated por-tions of the pipe sections forming the full diameter portions and the beveled portions and the clear end portions of abutting pipe sections forming the reduced diameter portions.
6. The method of applying protective plastic sheathing to an elongated generally cylindrical workpiece having alternating large and small diameter sections, com-prising the steps of passing the workpiece through a first annular sealing flap of flexible material into a first passageway of larger diameter than the maximum diameter of the workpiece and thence through a second annular sealing flap of flexible material into a second passageway of larger diameter than the maximum diameter of the workpiece, the distance between the sealing flaps being sufficient that at all times at least one of the sealing flaps is in sealing engagement with a large diameter section of the workpiece, applying a vacuum to the chamber defined by said first and second flaps, the first passageway and the exterior surface of the workpiece, passing the workpiece through an extrusion die annularly spaced from and surrounding the workpiece and forming the outlet end of said second passageway, extruding plastic sheathing material from the extrusion die onto the workpiece and applying a vacuum to the chamber defined by the second annular sealing flap, the second passageway, the outer surface of the workpiece, and the annular portion of the plastic sheathing material between the outer surface of the workpiece and the outlet of the extrusion die to draw the extruded plastic material into close conformity with the ex-terior surface of the workpiece including the minimum diameter portions thereof.
7. The method according to claim 6 wherein the workpiece comprises a series of aligned pipe section, each of which is coated intermediate its ends with insulation material to form the large diameter portions of the workpiece, the ends of the insulation coating being beveled and spaced from the ends of the respective pipe sections to leave the abutting ends of the pipe sections clear and of less diameter than the insulation coated portions.
8. The method according to claim 7 including the step of coating the exposed end portions of the pipe sections and the entire insulation of each with mastic material prior to passage of the respective pipe section into the vacuum chambers.
9. The method according to claim 8 including the step of wrapping the extremities of each pipe section with tape prior to application of mastic material to prevent the adherence of the outer plastic coating to the extremities of the pipe section and facilitating its removal therefrom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA278,821A CA1065568A (en) | 1977-05-19 | 1977-05-19 | Apparatus and method for forming water stops on insulated pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA278,821A CA1065568A (en) | 1977-05-19 | 1977-05-19 | Apparatus and method for forming water stops on insulated pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1065568A true CA1065568A (en) | 1979-11-06 |
Family
ID=4108701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA278,821A Expired CA1065568A (en) | 1977-05-19 | 1977-05-19 | Apparatus and method for forming water stops on insulated pipe |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1065568A (en) |
-
1977
- 1977-05-19 CA CA278,821A patent/CA1065568A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |
Effective date: 19961106 |