US20180099320A1 - Rectangilar-Ribbed Profile Tubular Core and Method - Google Patents
Rectangilar-Ribbed Profile Tubular Core and Method Download PDFInfo
- Publication number
- US20180099320A1 US20180099320A1 US14/999,836 US201614999836A US2018099320A1 US 20180099320 A1 US20180099320 A1 US 20180099320A1 US 201614999836 A US201614999836 A US 201614999836A US 2018099320 A1 US2018099320 A1 US 2018099320A1
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- US
- United States
- Prior art keywords
- strip
- forming
- extending
- core
- approximately
- 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.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 12
- 229910052751 metal Inorganic materials 0.000 claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 23
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000013011 mating Effects 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 235000013361 beverage Nutrition 0.000 description 2
- 239000011111 cardboard Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000004033 diameter control Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/156—Making tubes with wall irregularities
- B21C37/158—Protrusions, e.g. dimples
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/12—Making tubes or metal hoses with helically arranged seams
- B21C37/121—Making tubes or metal hoses with helically arranged seams with non-welded and non-soldered seams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D13/00—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form
- B21D13/04—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by rolling
- B21D13/045—Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form by rolling the corrugations being parallel to the feeding movement
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/02—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal by folding, e.g. connecting edges of a sheet to form a cylinder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
- B21D39/03—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of sheet metal otherwise than by folding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/02—Making hollow objects characterised by the structure of the objects
- B21D51/12—Making hollow objects characterised by the structure of the objects objects with corrugated walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C47/00—Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only
- B21C47/28—Drums or other coil-holders
Definitions
- This invention relates to relatively small diameter pipes or tubes and in particular to tubular cores on which sheets of metal or other material can be wound for shipment, handling and dispersal.
- dispersal includes mounting a core and a sheet wound thereon on an uncoiler, then rotating the core to unwind the sheet and feed the sheet to apparatus for forming the sheet into other goods (beverage cans, automotive body parts, etc.).
- Cores comprising paper or cardboard and glue are widely used for the above purposes.
- beverage can stock material can be manufactured using cores which are formed to various diameters, for example, inside diameters of 16′′, 20′′ or 24′′, from paper fiber about 0.5′′ to 1′′ thick.
- cores are not easily recyclable and must be disposed of in dumps or landfills, with the attendant cost and detrimental impact on the environment.
- These cores can be crushed to facilitate storage and disposal, but this can be a problem because of their bulk and the difficulty in crushing them.
- Tubes or pipes formed from metal strips are known in the art. See, for example, commonly assigned U.S. Pat. Nos. 3,940,962 and 3,247,692 in the name of Paul K. Davis, which disclose the so-called three-roll free forming method and apparatus for forming pipes. According to these patents, an elongated strip of metal is advanced in a generally planar path along its longitudinal axis and into forming stands which form the strip into a profile, then the profiled strip is fed continuously into a tube forming machine at which the strip is curled or wrapped between three sets of rollers (lead, mandrel and buttress rollers) into helical tubes.
- rollers lead, mandrel and buttress rollers
- the sets of rollers extend in rows at an angle relative to the longitudinal axis of the incoming strip, the helix angle, which is so related to the radius of the helical convolutions and the width of the incoming strip that the trailing edge of a preceding portion of the strip converges into contact with the leading edge of the following portion of the strip.
- the '962 patent also teaches diameter control.
- the tubes formed in accordance with the '692 and '962 patent are used in a variety of applications.
- U.S. Pat. Nos. 3,940,962 and 3,247,692 are hereby incorporated by reference in their entirety.
- Metal tubes or pipes have the potential for use as small diameter recyclable cores, but to date their use has been limited because of the difficulty of forming metal into small diameter tubes. For a given sheet thickness, smaller diameter tubes require greater force to deform the sheet and form the pipe. Also, decreasing the thickness of the tube wall (the thickness of the tube-forming sheet or strip) increases the tendency to buckle. In addition, it is more difficult to control the diameter and to maintain a consistent lockseam as the tube is formed.
- the present invention is embodied in the structure and manufacture of a thin wall bellows tube or pipe which is formed from a metal strip having a flattened sinusoidal corrugated profile.
- the tube is used as a core onto which a sheet of material can be wound or coiled for shipment, handling and dispersal.
- this invention relates to the structure and manufacture of such a core from strips of metal and, more particularly, from a thin strip of metal such as aluminum.
- FIG. 1 is a transverse cross-section of a metal strip having a transverse profile formed therein in accordance with the present invention, preparatory to the strip being helically wound into a tubular core.
- FIG. 2 depicts a strip such as that of FIG. 1 being wound into a helical tubular core.
- FIG. 3 is a transverse cross-section of two adjacent windings of a strip such as that of FIG. 1 where the strip is helically wound to form a core such as that of FIG. 2 , and the leading edge of one winding of the strip is joined by a lockseam to the trailing edge of the adjacent winding.
- the pipe forming in accordance with the present invention can be achieved via fixed forming using a forming shoe with a predetermined inside diameter to provide the desired pipe diameter, or by free forming using several sets of roller dies of different sizes to achieve pipes of different diameters, by adjusting the helix angle or by a combination thereof.
- the '962 patent describes corrugating and forming sections which can continuously corrugate a strip or sheet of material and form the corrugated strip into a pipe.
- the corrugating section comprises multiple stands of rolls which form a curved sinusoidal profile in the driven strip.
- the corrugated strip is then fed to the three-roll forming section which deforms or curls the advancing strip into a cylinder or pipe along which the opposite strip edges form a mating spiral, then seals the mating strip edges into a continuous lockseam which wraps along the pipe.
- the continuous corrugated pipe is then advanced to a discharge station where the pipe can be cut into lengths and received on a run-out table for any further processing and handling.
- the illustrative equipment and process described here are an improvement of the approach described in the '962 patent in that in accordance with the present invention multiple passes are used to roll-form a flat metal sheet or strip into an arcuate sinusoidal profile, then at least one final pass is used to deform the arcuate sinusoidal profile of the strip into a flattened, generally rectangular profile.
- a flat metal strip or sheet is roll-formed to a desired profile.
- the flat metal strip is passed through multiple roll-forming stands, to form the strip into a transverse profile comprising arcuate ribbed sinusoidal corrugations, then prior to forming the strip into a tube or core, the strip is passed through a final roll-forming stand or stands to flatten the strip profile, that is, to reform the strip profile into a rectangular-ribbed profile.
- a final roll-forming stand or stands to flatten the strip profile, that is, to reform the strip profile into a rectangular-ribbed profile.
- nine passes are used to roll-form the strip into an arcuate sinusoidal transverse profile, then a tenth pass is used to deform and thereby flatten the profile into the rectangular-ribbed profile 10 .
- the above profile-forming method results in the profile 10 shown in FIG. 1 which comprises alternating ribs in the form of upwardly extending ridges 11 and downwardly extending grooves 12 .
- the ridges 11 have flat top or upper surfaces 13 and the grooves 12 have flat bottom or lower surfaces 14 .
- a downward (or upward) opening flange or tab 16 is formed extending along one longitudinal edge of the strip or sheet transverse to the width of the strip and an opposite opening upward (or downward) extending tab 17 is formed extending along the opposite longitudinal edge of the strip.
- the rectangular-ribbed profile strip or sheet 10 is wrapped using helical forming apparatus into a cylindrical pipe or core 20 of the desired diameter and, as shown in FIG. 3 , the mating tabs 16 and 17 are compressed together to form a four-ply interlocked helical seam 21 which wraps around the pipe lengthwise along the pipe.
- the strip edges are held together via a continuous mechanical lockseam which is pushed together to lock the lockseam.
- the spaced-apart adjacent flat surfaces 14 of the rectangular grooves 12 form the outside surface 22 of the core 20 and the spaced-apart flat surfaces 13 of the rectangular ridges 11 form the inside surface 23 of the core.
- the strip 10 illustrated in FIG. 1 is symmetrical top-to-bottom and thus can be reversed top-to-bottom during the pipe wrapping process depicted in FIG. 2 . Then the spaced-apart flat ridge surfaces 13 form the outer surface 22 of the core and the spaced-apart flat groove surfaces 14 form the inside surface of the core.
- the ridges and grooves maintain their generally rectangular, ribbed shape and form an open structure with spacing between the adjacent ridges 11 as well as spacing between the adjacent grooves 12 .
- This is unlike prior designs which use non-rectangular shapes and/or an additional deformation step to form a continuous outer surface in order to provide the required strength and integrity and to provide ample flat surface area for sheet support.
- the outer surface is interrupted by the spacing of the inside rectangles.
- the width of the ridges and the grooves, and the spacing between adjacent ridges and between adjacent grooves are all equal.
- Embossments or reinforced embossments can be added to the ribs, e.g., to the legs, to enhance core strength.
- ridges 11 and grooves 12 were formed which were 0.27′′ in height from the top of the a ridge to the bottom of the adjacent groove. Both the ridges and the grooves were 0.27′′ wide and were spaced apart 0.27′′ from adjacent ridges and grooves, respectively. See FIG. 1 .
- the rectangular corrugated strips or sheets 10 were fed to the three-roll apparatus using helix angles ⁇ 60° measured from the axis of the outgoing pipe to form continuous length pipes of 16′′, 20′′ and 24′′ inside diameters.
- the pipes 20 were then cut into various lengths for use as recyclable cores onto which sheets of metal such as aluminum were to be wound for handling and dispersal.
- the invention can be used to form pipes approximately 6′′ in diameter and greater.
- increasing the helix angle increases the pipe diameter.
- increasing the sheet width reduces the required helix angle.
- Increasing the strip width tends to increase the pipe wrapping/manufacturing speed and to decrease the number of seams in a given length of pipe.
Abstract
Description
- This patent application claims the benefit of prior U.S. provisional patent application No. 62/231,495, filed Jul. 7, 2015, which provisional patent application is hereby incorporated by reference in its entirety.
- The words “pipe” and “tube” are used interchangeably here.
- This invention relates to relatively small diameter pipes or tubes and in particular to tubular cores on which sheets of metal or other material can be wound for shipment, handling and dispersal. As used here, the word dispersal includes mounting a core and a sheet wound thereon on an uncoiler, then rotating the core to unwind the sheet and feed the sheet to apparatus for forming the sheet into other goods (beverage cans, automotive body parts, etc.).
- Cores comprising paper or cardboard and glue are widely used for the above purposes. For example, beverage can stock material can be manufactured using cores which are formed to various diameters, for example, inside diameters of 16″, 20″ or 24″, from paper fiber about 0.5″ to 1″ thick. These cores are not easily recyclable and must be disposed of in dumps or landfills, with the attendant cost and detrimental impact on the environment. These cores can be crushed to facilitate storage and disposal, but this can be a problem because of their bulk and the difficulty in crushing them.
- Tubes or pipes formed from metal strips are known in the art. See, for example, commonly assigned U.S. Pat. Nos. 3,940,962 and 3,247,692 in the name of Paul K. Davis, which disclose the so-called three-roll free forming method and apparatus for forming pipes. According to these patents, an elongated strip of metal is advanced in a generally planar path along its longitudinal axis and into forming stands which form the strip into a profile, then the profiled strip is fed continuously into a tube forming machine at which the strip is curled or wrapped between three sets of rollers (lead, mandrel and buttress rollers) into helical tubes. The sets of rollers extend in rows at an angle relative to the longitudinal axis of the incoming strip, the helix angle, which is so related to the radius of the helical convolutions and the width of the incoming strip that the trailing edge of a preceding portion of the strip converges into contact with the leading edge of the following portion of the strip. The '962 patent also teaches diameter control. The tubes formed in accordance with the '692 and '962 patent are used in a variety of applications. U.S. Pat. Nos. 3,940,962 and 3,247,692 are hereby incorporated by reference in their entirety.
- Metal tubes or pipes have the potential for use as small diameter recyclable cores, but to date their use has been limited because of the difficulty of forming metal into small diameter tubes. For a given sheet thickness, smaller diameter tubes require greater force to deform the sheet and form the pipe. Also, decreasing the thickness of the tube wall (the thickness of the tube-forming sheet or strip) increases the tendency to buckle. In addition, it is more difficult to control the diameter and to maintain a consistent lockseam as the tube is formed.
- Commonly assigned U.S. Pat. No. 5,074,138 in the name of Robert F. Miller describes an improvement of the invention disclosed in incorporated U.S. Pat. No. 3,247,692. The improvement involves the design and manufacture of a lockseam pipe which has a corrugated, sinusoidal profile comprising arcuate/semi-circular ridges and grooves, and which is adapted for improving the physical characteristics of the pipe and the strength of the lockseam. U.S. Pat. No. 5,074,138 is hereby incorporated by reference in its entirety.
- The present invention is embodied in the structure and manufacture of a thin wall bellows tube or pipe which is formed from a metal strip having a flattened sinusoidal corrugated profile. In one aspect the tube is used as a core onto which a sheet of material can be wound or coiled for shipment, handling and dispersal. In a particular aspect this invention relates to the structure and manufacture of such a core from strips of metal and, more particularly, from a thin strip of metal such as aluminum.
-
FIG. 1 is a transverse cross-section of a metal strip having a transverse profile formed therein in accordance with the present invention, preparatory to the strip being helically wound into a tubular core. -
FIG. 2 depicts a strip such as that ofFIG. 1 being wound into a helical tubular core. -
FIG. 3 is a transverse cross-section of two adjacent windings of a strip such as that ofFIG. 1 where the strip is helically wound to form a core such as that ofFIG. 2 , and the leading edge of one winding of the strip is joined by a lockseam to the trailing edge of the adjacent winding. - The pipe forming in accordance with the present invention can be achieved via fixed forming using a forming shoe with a predetermined inside diameter to provide the desired pipe diameter, or by free forming using several sets of roller dies of different sizes to achieve pipes of different diameters, by adjusting the helix angle or by a combination thereof.
- The illustrative equipment and process described here use, and are improvements of, the multi-pass roll former, three roll, free forming system disclosed in commonly assigned and incorporated U.S. Pat. Nos. 3,940,962 and 3,247,692 as specifically adapted to bellows pipe (relatively small diameter corrugated pipe) in commonly assigned and incorporated U.S. Pat. No. 5,074,138.
- The '962 patent describes corrugating and forming sections which can continuously corrugate a strip or sheet of material and form the corrugated strip into a pipe. The corrugating section comprises multiple stands of rolls which form a curved sinusoidal profile in the driven strip. The corrugated strip is then fed to the three-roll forming section which deforms or curls the advancing strip into a cylinder or pipe along which the opposite strip edges form a mating spiral, then seals the mating strip edges into a continuous lockseam which wraps along the pipe. The continuous corrugated pipe is then advanced to a discharge station where the pipe can be cut into lengths and received on a run-out table for any further processing and handling.
- The illustrative equipment and process described here are an improvement of the approach described in the '962 patent in that in accordance with the present invention multiple passes are used to roll-form a flat metal sheet or strip into an arcuate sinusoidal profile, then at least one final pass is used to deform the arcuate sinusoidal profile of the strip into a flattened, generally rectangular profile.
- According to the present invention and referring to
FIG. 1 , initially a flat metal strip or sheet is roll-formed to a desired profile. - In a presently preferred embodiment of the present invention, initially the flat metal strip is passed through multiple roll-forming stands, to form the strip into a transverse profile comprising arcuate ribbed sinusoidal corrugations, then prior to forming the strip into a tube or core, the strip is passed through a final roll-forming stand or stands to flatten the strip profile, that is, to reform the strip profile into a rectangular-ribbed profile. Illustratively and presently, nine passes are used to roll-form the strip into an arcuate sinusoidal transverse profile, then a tenth pass is used to deform and thereby flatten the profile into the rectangular-ribbed
profile 10. - The above profile-forming method results in the
profile 10 shown inFIG. 1 which comprises alternating ribs in the form of upwardly extendingridges 11 and downwardly extendinggrooves 12. Theridges 11 have flat top orupper surfaces 13 and thegrooves 12 have flat bottom orlower surfaces 14. A downward (or upward) opening flange ortab 16 is formed extending along one longitudinal edge of the strip or sheet transverse to the width of the strip and an opposite opening upward (or downward) extendingtab 17 is formed extending along the opposite longitudinal edge of the strip. - To form the profiled strip into a tube or core, and referring to
FIG. 2 , the rectangular-ribbed profile strip orsheet 10 is wrapped using helical forming apparatus into a cylindrical pipe orcore 20 of the desired diameter and, as shown inFIG. 3 , themating tabs helical seam 21 which wraps around the pipe lengthwise along the pipe. The strip edges are held together via a continuous mechanical lockseam which is pushed together to lock the lockseam. - In the formed
pipe 20, the spaced-apart adjacentflat surfaces 14 of therectangular grooves 12 form theoutside surface 22 of thecore 20 and the spaced-apartflat surfaces 13 of therectangular ridges 11 form theinside surface 23 of the core. - The
strip 10 illustrated inFIG. 1 is symmetrical top-to-bottom and thus can be reversed top-to-bottom during the pipe wrapping process depicted inFIG. 2 . Then the spaced-apartflat ridge surfaces 13 form theouter surface 22 of the core and the spaced-apartflat groove surfaces 14 form the inside surface of the core. - Referring to the
FIG. 3 cross-section of thecore 20 depicted inFIG. 2 , in the pipes made in accordance with the present invention, the ridges and grooves maintain their generally rectangular, ribbed shape and form an open structure with spacing between theadjacent ridges 11 as well as spacing between theadjacent grooves 12. This is unlike prior designs which use non-rectangular shapes and/or an additional deformation step to form a continuous outer surface in order to provide the required strength and integrity and to provide ample flat surface area for sheet support. The outer surface is interrupted by the spacing of the inside rectangles. In an embodiment, the width of the ridges and the grooves, and the spacing between adjacent ridges and between adjacent grooves, are all equal. - Embossments or reinforced embossments can be added to the ribs, e.g., to the legs, to enhance core strength.
- The above design and method have been used to form cylindrical cores of different sizes.
- Specifically, in strips or
sheets 10 of aluminum which were 0.010″ to 0.023″ thick and 3⅝″ wide,ridges 11 andgrooves 12 were formed which were 0.27″ in height from the top of the a ridge to the bottom of the adjacent groove. Both the ridges and the grooves were 0.27″ wide and were spaced apart 0.27″ from adjacent ridges and grooves, respectively. SeeFIG. 1 . The rectangular corrugated strips orsheets 10 were fed to the three-roll apparatus using helix angles ≧60° measured from the axis of the outgoing pipe to form continuous length pipes of 16″, 20″ and 24″ inside diameters. Thepipes 20 were then cut into various lengths for use as recyclable cores onto which sheets of metal such as aluminum were to be wound for handling and dispersal. - Other dimensions and materials will be readily adapted to the invention described here by those of usual skill in the art. For example the invention can be used to form pipes approximately 6″ in diameter and greater. For a given sheet width, increasing the helix angle increases the pipe diameter. For a given pipe diameter, increasing the sheet width reduces the required helix angle. Increasing the strip width tends to increase the pipe wrapping/manufacturing speed and to decrease the number of seams in a given length of pipe.
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US14/999,836 US20180099320A1 (en) | 2015-07-07 | 2016-07-07 | Rectangilar-Ribbed Profile Tubular Core and Method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US201562231495P | 2015-07-07 | 2015-07-07 | |
US14/999,836 US20180099320A1 (en) | 2015-07-07 | 2016-07-07 | Rectangilar-Ribbed Profile Tubular Core and Method |
Publications (1)
Publication Number | Publication Date |
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US20180099320A1 true US20180099320A1 (en) | 2018-04-12 |
Family
ID=61829677
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US14/999,836 Abandoned US20180099320A1 (en) | 2015-07-07 | 2016-07-07 | Rectangilar-Ribbed Profile Tubular Core and Method |
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US (1) | US20180099320A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10933455B2 (en) | 2016-07-07 | 2021-03-02 | Pacific Roller Die Company, Inc. | Tubular core and method |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3913623A (en) * | 1972-07-17 | 1975-10-21 | Emil Siegwart | Flexible corrugated tube |
US4838317A (en) * | 1980-10-14 | 1989-06-13 | Andre James R | Hydraulically efficient ribbed pipe |
US6009912A (en) * | 1991-07-26 | 2000-01-04 | Andre; James R. | Steel pipe with integrally formed liner and method of fabricating the same |
-
2016
- 2016-07-07 US US14/999,836 patent/US20180099320A1/en not_active Abandoned
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3913623A (en) * | 1972-07-17 | 1975-10-21 | Emil Siegwart | Flexible corrugated tube |
US4838317A (en) * | 1980-10-14 | 1989-06-13 | Andre James R | Hydraulically efficient ribbed pipe |
US6009912A (en) * | 1991-07-26 | 2000-01-04 | Andre; James R. | Steel pipe with integrally formed liner and method of fabricating the same |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10933455B2 (en) | 2016-07-07 | 2021-03-02 | Pacific Roller Die Company, Inc. | Tubular core and method |
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