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WO1996011356A1 - Conduite souple a tube central remplaçable destinee a un produit en fusion - Google Patents

Conduite souple a tube central remplaçable destinee a un produit en fusion Download PDF

Info

Publication number
WO1996011356A1
WO1996011356A1 PCT/US1995/013315 US9513315W WO9611356A1 WO 1996011356 A1 WO1996011356 A1 WO 1996011356A1 US 9513315 W US9513315 W US 9513315W WO 9611356 A1 WO9611356 A1 WO 9611356A1
Authority
WO
WIPO (PCT)
Prior art keywords
tube
sleeve
hose
core tube
inner core
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.)
Ceased
Application number
PCT/US1995/013315
Other languages
English (en)
Inventor
Martin A. Allen
John T. Fetcko
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ExxonMobil Chemical Patents Inc
Original Assignee
Exxon Chemical Patents Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Exxon Chemical Patents Inc filed Critical Exxon Chemical Patents Inc
Publication of WO1996011356A1 publication Critical patent/WO1996011356A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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
    • F16L53/00—Heating of pipes or pipe systems; Cooling of pipes or pipe systems
    • F16L53/30—Heating of pipes or pipe systems
    • F16L53/35—Ohmic-resistance heating
    • F16L53/38—Ohmic-resistance heating using elongate electric heating elements, e.g. wires or ribbons

Definitions

  • This invention relates to a flexible hose for the transfer of pressurized heated liquids.
  • a flexible hose for use in transf « ⁇ ing pressurized molten polymers.
  • a flexible hose which has a replacement core in the event the hose becomes damaged, worn, or clogged during operation.
  • thermoplastic materials There are presently a number of commercially important products that are manufactured using thermoplastic materials. Among these are polymer hot melt adhesives which are applied in molten form to substrates for bonding the substrates together. Hot melt adhesives have been used for bonding furniture parts, automotive parts, diaper backings, and the like. These adhesives exist in the solid phase at room conditions and must be heated before application to a substrate.
  • a supply of the adhesive is maintained in a molten state inside a temperature controlled heating container where the adhesive temperature is typically between 250-350 ° F.
  • the molten adhesive may be applied to the substrate using either a hand operated dispensing gun or a stationary dispenser for applying adhesive to substrates on a moving conveyor line. In either case, the molten adhesive is usually transferred from the supply container to the dispenser by pumping the adhesive through a heated hose. It is necessary that the hose be heated to maintain the adhesive at the desired operating temperature and in the liquid phase as it flows through the hose. Heating is also important in the start-up operation for melting solidified adhesive which may be present in the hose from previous use. Heating is usually accomplished using electrical resistive heating elements which are incorporated into the hose as it is manufactured.
  • the hoses In addition to being operative for heating, the hoses must have the structural integrity to withstand the high internal pressures (typically several hundred psi) at which the adhesive is pumped from the supply container to the dispenser.
  • Another requirement for hoses used in polymer processing is flexibility to permit movement of a hand operated dispensing gun in the case where an operator may need to move the gun to apply adhesives at different points on a substrate. Flexibility also facilitates ⁇ nnecting a supply container to a stationary dispenser.
  • Yet another important requirement of the hose is that it mermally insulate the heating elements and molten adhesive inside the hose from the surroundings. This is important to rninimize costly energy losses from the hose, and for safety reasons in the case where a worker contacts the outside of the hose.
  • hoses of the type described have been used for trarisferring a pressurized molten or semimolten polymer from an extruder apparatus to a meltblowing die where the polymer is extruded through a plurality of side-by-side orifices to form fibers. Heated air streams are made to converge onto opposite sides of the fibers to drawdown the fibers and blow the fibers onto a collector surface. The converging air streams become turbulent and induce interfiber entanglement so that as the fibers deposit on the collector a nonwoven fabric is formed. Hoses of the type described also find use in heating and transferring the hot air used in the meltblowing process.
  • thermoplastics in many manufacturing processes require flexible hoses which are heated, able to withstand high internal pressures and temperatures, flexible, and uermally insulated. Such hoses typically have internal diameters in the range of 1/2 inch to S inches.
  • a prior art hose used for transferring hot melt adhesives is described in U. S.
  • Patent 4,455,474 This hose is described in relation to transferring adhesives from a supply container to a hand operated dispensing gun, and is of composite design being constructed from a number of layers of different materials.
  • the hose comprises a TeflonTM (tetrafluoroethylene fluorocarbon polymers) inner core tube with conventional hydraulic fittings at each end.
  • the core tube is encased in a fibrous stainless steel braiding to add strength to the tube.
  • the hose further comprises double sided tape wrapped around the braiding and adhered to the braiding. Electrical resistance heating tape is spirally wound around and adhered to the outside of the tape for heating the adhesive flowing through the inner teflon core.
  • the remaining layers of the composite hose comprise a layer of insulating material wrapped around the heating tape, a number of electrical leads spirally wound around the insulation for carrying electrical signals between the supply container and the gun, followed by additional layers of insulation.
  • the entire hose is encased in an outer stainless steel braiding which is held in place by hose-type clamps at either end of the hose. Molded plastic cuffs attached at each end of the hose provide support for the hydraulic fittings and have formed therein an exit conduit for the electrical heater leads and gun electrical leads.
  • U.S. Patent 4,553,023 is a continuation-in-part of U.S. Patent 4,455,474 and teaches the use of electrical resistance heating wires in place of electrical heating tape.
  • a heated flexible hose for the transfer of hot melt adhesives and other polymer liquids is marketed by Furon Dekoran Unitherm Division (designated as Series 200 and 400 hoses) of Cape Coral, Florida.
  • These hoses comprise either a teflon or convoluted stainless steel core tube having a spirally wound electrical resistance heating wire around the core, and insulating materials around the heating elements and core tube.
  • the core, heating wire, and insulation are encased in a corrosion resistant jacket or sleeve.
  • the convoluted steel tube is equivalent to a corrugated tube and combines good strength with some flexibility.
  • the core tube has conventional hydraulic fittings at each end for attaching the hose.
  • a problem encountered in the transfer of molten polymers is due to the high internal temperatures and/or pressures the transfer hoses must withstand.
  • the polymer may experience carbonization wherein carbon residue becomes burned onto the inner walls of the flow tube. The residue may cause clogging as well as act as a containment.
  • the occurrence of carbonization has been remedied by placing the hose in a high temperature burn-out oven to bum the residue away. Such a process is time consuming, costly, and runs the risk of damaging the various components of the hose at the high oven temperatures.
  • the high pressures at which molten polymers are transferred give rise to the potential of rupturing the inner flow tube of the hose.
  • the inner core of the hose consists of a teflon tube which is encased in a stainless steel braiding.
  • the teflon tube can withstand high temperatures and provides flexibility while the braiding adds strength for withstanding high pressures. In time the braiding may fray due to corrosion or internal abrasion as the hose is flexed, thereby creating weak spots in the inner core. Rupturing of hoses belonging to the prior art would require the hose to be completely rebuilt or would render the hose useless altogether. The high temperature environment only exacerbates the rupture problem due to thermally induced stresses.
  • the present invention is predicated on a flexible, high pressure, and electrically heated hose which has the novel feature of a replaceable core in the event the core becomes clogged, worn, or damaged.
  • the present hose is particularly adapted for the transfer of hot meh adhesives and other molten polymers and provides an economical solution to the problems of polymer carbonization within the hose and also hose rupture.
  • the hose is particularly adapted for the transfer of heated melts (e.g. polymers and adhesives) but may also be used to conduct other heated fluids.
  • the hose of the present invention is constructed in two separable main components which comprise an inner core tube and an outer sleeve assembly which receives the detachable inner core.
  • the fluid is transferred through the inner core tube which is disposed axially within the outer sleeve assembly.
  • the outer sleeve assembly comprises a sleeve tube, heating wire or tape wound spirally around the sleeve tube, thermal insulating material surrounding the sleeve tube and heating wire, and outer braiding surrounding the insulation.
  • the inner core tube is slidable within the sleeve tube and is secured therein by fasteners at one or both ends of the hose.
  • Figure 2 is a cross-sectional view of the inner core tube.
  • Figure 1 illustrates flexible hose 1 constructed according to the present invention as comprising inner core tube 11 detachably mounted in outer sleeve assembly 12.
  • inner tube 11 is fixed to sleeve 12 using retaining nut 13.
  • the retaining nut is disengaged and the tube is slidably withdrawn from the opposite end of the sleeve.
  • the components of the sleeve assembly remain intact and a replacement inner core tube may be installed in the sleeve by reversing the removal procedure.
  • inner core tube 11 of the present invention comprises tube 14 having threaded end 16 and fitting 17 which may be a conventional hydraulic fitting.
  • Tube 14 may be a teflon tube or more preferably a stainless steel tube of the convoluted or corrugated type to give flexibility.
  • it may be necessary to attach straight extension tubing 18 and 19 at each end of tube 14, particularly a corrugated tube 14, for forming threads 16 and mounting fitting 17 thereon, respectively.
  • the extensions may be formed by welding segments of pipe to tube 14.
  • the internal threads of fitting 17 are compatible with external threads 16 so that multiple hoses may be connected in series.
  • End 1 has threaded thereon retainer nut 13 and lock washer 22.
  • Tubing 19 has attached thereto shoulder 23 which acts to apply a backup force as nut 13 is tightened to secure the inner core tube in the outer sleeve assembly (see Figure 1).
  • the shoulder may be formed by welding a washer to extension 19.
  • Stainless steel braiding 26 may be used to surround tube 14 for providing strength to the inner core tubing 14.
  • outer sleeve assembly 12 comprises inner sleeve tube 28, heating element 29, thermal insulation 31, and outer braiding 32.
  • Tube 28 is preferably a teflon tube to give good flexibility; however, a convoluted steel tube may also be used.
  • a steel braiding (not shown) may be placed around the tube. The braiding is optional since inner core tube 14 and inner core braiding 26 provide adequate strength for most operations.
  • Heating element 29 may be heating wire spirally wound around tube 28. Element 29 may alternatively be heating tape. Heating element 29 will have a pair of electrical leads (not shown) which pass out of the hose through either end cap 38 or 39 for connecting the heating wire to an electrical power supply.
  • Insulating layer 31 surrounds heating element 29 and tube 28 and acts to insulate the outside of the hose as well as to hold the heater 29 in good heat transfer relation with braiding 28.
  • Insulation 31 may be conventional fiberglass insulation of sufficient thickness to keep the temperature of the outside of the sleeve assembly at a safe level for workers using the hose.
  • Insulation 31 also acts to electrically insulate the outside of the sleeve assembly from electrical heating element 29.
  • Outer braiding 32 surrounds insulation 31 and protects the internal components of the sleeve assembly as well as adding strength to the assembly.
  • Braiding 32 also acts as a retaining jacket to maintain the components of the assembly in assembled relation, and may be made of polyester or more preferably stainless steel. In practice other layers may be provided in assembly 12. For example it is known in the art to provide a layer of vinyl electrical tape around the heating element 29 to act as a moisture barrier.
  • Optional messenger wire 36 and messenger wire braiding 37 may be provided between insulation 31 and outer braiding 32.
  • Messenger wire 36 may be used to transmit electrical signals over the length of the hose as in the case where the hose may be equipped with temperature and/or pressure transducers.
  • Messenger wire 36 may also be used to transmit signals to a dispensing unit such as a hand held gun. Multiple messenger wires may be provided.
  • the construction of the sleeve assembly 12 including the tube 28, heating element 29, insulation 31, messenger wire components 36 and 37, outer braiding 38, as well as the heating element electrical leads and moisture barrier tape may be in accordance with U.S. Patent 4,455,474, the disclosure of which is incorporated herein by reference.
  • End caps 38 and 39 are secured to each end of the sleeve assembly and act to protect the internal components of the sleeve.
  • the end caps are held in place by a compression fit around the sleeve outer braiding 38 and act to hold the components of the assembly together.
  • End caps 38 and 39 have center holes 41 and 42, respectively, which are sufficiently large to permit inner core tube 11 to pass therethrough.
  • Backup washer 43 is provided between cap 39 and sleeve assembly 12.
  • Inner core tube 11 is installed in sleeve assembly 12 by first inserting threaded end 16 into the sleeve through end cap hole 42. The inner core is pushed through the outer assembly until end 16 protrudes through opposing end cap hole 41 and core tube shoulder 23 contacts washer 43.
  • a small amount of clearance is provided between inner sleeve tube 28 and inner core tube braiding 26 so that the inner core tube may be slidably inserted without damaging or disrupting braiding 26.
  • Washer 22 seats onto end cap 44 and retainer nut 13 is threaded onto end 16 and tightened for securing the inner core tube 11 in sleeve assembly 12 for operation.
  • End cap 44 and backup washer 43 are provided to protect end caps 38 and 39 from wear over the multiplicity of times the inner core may be replaced.
  • End cap 44 and washer 43 are optional and retaining nut 13 may seat directly onto end cap 38 and shoulder 23 may be sized to seat onto end cap 39.
  • either hose end 16 or fitting 17 would be connected to a supply of molten polymer and the other end connected to a polymer dispensing unit such as a hot melt adhesive gun or other dispenser, or a meltblowing die.
  • a polymer dispensing unit such as a hot melt adhesive gun or other dispenser, or a meltblowing die.
  • the polymer entering the hose is conducted through inner tube 14 and delivered to the dispensing unit.
  • the electrical heating wire 29 would be energized prior to introducing the polymer into the hose.
  • sleeve assembly tube 28, inner core braiding 26, and inner tube 14 are in good heat transfer relation and therefore offer little resistance to the flow of heat from the heating wire to the molten polymer flowing through the inner core tube. While a small air gap may exist between braiding 26 and sleeve tube 28 to allow the inner core to be slidable within the sleeve, it should be realized that the heat dissipated by the heating wire 29 will still tend to flow radically inward since the resistance to heat flow in the radically outward direction is far greater due to thermal insulation 31. In the event that inner core tube 14 becomes clogged or damaged, the inner core may be easily removed from sleeve assembly 12 by reversing the above installation procedure.
  • the hose of the present invention is applicable to virtually any of the polymers or copolymers presently in use in manufacturing operations and includes polypropylene, low and high density polyethylene, ethylene, coporymers (including EVA copolymer), nylon, polyamide, polyesters, polystyrene, poly-4-methyl-pentene, polymethylethacry- ate, polytrifluorochloroethylene, polyurethanes, poly-carbonates, silicones, and blends of these.
  • the present hose is equally applicable to the transfer of high temperature and pressurized gases such as the heated air used in meltblowing.
  • the term fluid hereinafter is understood to refer to both liquids and gases.
  • the clearance between the inner core tube 11 and the outer sleeve assembly 12 should be sufficient to allow the former to be inserted and withdrawn from the latter. Clearance of 0.01 to 0.1 inches should be sufficient.
  • the outside diameter of the sleeve assembly 12, inner diameter of the inner core tube 11, and hose length will be similar to those presently in use (e.g. 1.5 to 6.0 inches O.D., 0.25 to 5.0 inches I.D., and 5.0 to 25.0 feet in length).
  • the operating temperature and pressure similarly will be in the range of those presently in use (e.g. 100 to 700 ° F and
  • the flexibility of the present hose will depend on the diameter of the hose with minimum bend radius increasing with diameter. For the range of sizes cited above the minimum bend radius will typically be between 8.0 to 30.0 inches.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)

Abstract

Une conduite souple (10), destinée à acheminer un polymère en fusion et d'autres liquides chauds, comprend: (a) un ensemble manchon externe (12) doté d'éléments chauffants (29) et d'une isolation (31), et (b) un tube central (11) monté de façon amovible dans cet ensemble manchon (12). Quand ce tube central (11) subit des dégâts ou une usure, on peut le remplacer en le détachant et en le retirant de l'ensemble manchon (12) avant d'introduire dans celui-ci un nouveau tube central.
PCT/US1995/013315 1994-10-05 1995-10-05 Conduite souple a tube central remplaçable destinee a un produit en fusion Ceased WO1996011356A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US31827494A 1994-10-05 1994-10-05
US08/318,274 1994-10-05

Publications (1)

Publication Number Publication Date
WO1996011356A1 true WO1996011356A1 (fr) 1996-04-18

Family

ID=23237452

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1995/013315 Ceased WO1996011356A1 (fr) 1994-10-05 1995-10-05 Conduite souple a tube central remplaçable destinee a un produit en fusion

Country Status (1)

Country Link
WO (1) WO1996011356A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1526322A1 (fr) * 2003-10-21 2005-04-27 Rasmussen GmbH Conduit de fluide
US8974715B2 (en) 2009-09-23 2015-03-10 Stratasys, Inc. Seam concealment for three-dimensional models
US20180017200A1 (en) * 2016-07-15 2018-01-18 Nordson Corporation Adhesive transfer hose having a barrier layer and method of use
DE102019126218A1 (de) * 2019-09-27 2021-04-01 Steinel Gmbh Heißklebevorrichtung und Wärmeisolierung für eine Heißklebevorrichtung
WO2024156932A1 (fr) * 2023-01-24 2024-08-02 Focke Meler Gluing Solutions, S.A. Tuyau pour l'application d'adhésifs thermofusibles

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4455474A (en) * 1981-11-27 1984-06-19 Nordson Corporation Thermally insulated electrically heated hose for transmitting hot liquids
US4553023A (en) * 1981-11-27 1985-11-12 Nordson Corporation Thermally insulated electrically heated hose for transmitting hot liquids
EP0160731A1 (fr) * 1984-04-30 1985-11-13 MELTEX Verbindungs-technik GmbH Tuyau flexible pour colles à fusion
EP0187943A2 (fr) * 1985-01-14 1986-07-23 Nordson Corporation Connecteur électrique entre une unité tuyau souple pour la fusion à chaud et un pistolet
US5017760A (en) * 1989-07-31 1991-05-21 Gb Electrical, Inc. Plastic pipe heater

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4455474A (en) * 1981-11-27 1984-06-19 Nordson Corporation Thermally insulated electrically heated hose for transmitting hot liquids
US4553023A (en) * 1981-11-27 1985-11-12 Nordson Corporation Thermally insulated electrically heated hose for transmitting hot liquids
EP0160731A1 (fr) * 1984-04-30 1985-11-13 MELTEX Verbindungs-technik GmbH Tuyau flexible pour colles à fusion
EP0187943A2 (fr) * 1985-01-14 1986-07-23 Nordson Corporation Connecteur électrique entre une unité tuyau souple pour la fusion à chaud et un pistolet
US5017760A (en) * 1989-07-31 1991-05-21 Gb Electrical, Inc. Plastic pipe heater

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7190892B2 (en) 2003-10-21 2007-03-13 Rasmussen Gmbh Fluid line
EP1526322A1 (fr) * 2003-10-21 2005-04-27 Rasmussen GmbH Conduit de fluide
US10675803B2 (en) 2009-09-23 2020-06-09 Stratasys, Inc. Seam concealment for three-dimensional models
US8974715B2 (en) 2009-09-23 2015-03-10 Stratasys, Inc. Seam concealment for three-dimensional models
US9724866B2 (en) 2009-09-23 2017-08-08 Stratasys, Inc. Seam concealment for three-dimensional models
US20240255089A1 (en) * 2016-07-15 2024-08-01 Nordson Corporation Adhesive transfer hose having a barrier layer and method of use
EP3306160A1 (fr) * 2016-07-15 2018-04-11 Nordson Corporation Tuyau de transfert d'adhésif ayant une couche barrière et procédé d'utilisation
CN107631108A (zh) * 2016-07-15 2018-01-26 诺信公司 具有屏障层的粘合剂传输软管和使用方法
EP3306160B1 (fr) 2016-07-15 2021-11-17 Nordson Corporation Tuyau de transfert d'adhésif ayant une couche barrière et procédé d'utilisation
EP4043775A1 (fr) * 2016-07-15 2022-08-17 Nordson Corporation Tuyau de transfert d'adhésif ayant une couche barrière et procédé d'utilisation
US12031658B2 (en) 2016-07-15 2024-07-09 Nordson Corporation Adhesive transfer hose having a barrier layer and method of use
US20180017200A1 (en) * 2016-07-15 2018-01-18 Nordson Corporation Adhesive transfer hose having a barrier layer and method of use
US12416381B2 (en) * 2016-07-15 2025-09-16 Nordson Corporation Adhesive transfer hose having a barrier layer and method of use
DE102019126218A1 (de) * 2019-09-27 2021-04-01 Steinel Gmbh Heißklebevorrichtung und Wärmeisolierung für eine Heißklebevorrichtung
WO2024156932A1 (fr) * 2023-01-24 2024-08-02 Focke Meler Gluing Solutions, S.A. Tuyau pour l'application d'adhésifs thermofusibles
ES2978026A1 (es) * 2023-01-24 2024-09-04 Focke Meler Gluing Solutions S A Manguera para aplicacion de adhesivos termofusibles

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