WO2014172352A1 - Système et procédé de distribution de produit thermofusible à refroidissement par air - Google Patents

Système et procédé de distribution de produit thermofusible à refroidissement par air Download PDF

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Publication number
WO2014172352A1
WO2014172352A1 PCT/US2014/034168 US2014034168W WO2014172352A1 WO 2014172352 A1 WO2014172352 A1 WO 2014172352A1 US 2014034168 W US2014034168 W US 2014034168W WO 2014172352 A1 WO2014172352 A1 WO 2014172352A1
Authority
WO
WIPO (PCT)
Prior art keywords
venturi
feed
inlet
hot melt
melt
Prior art date
Application number
PCT/US2014/034168
Other languages
English (en)
Inventor
Bryce J. Gapinski
Nicholas K. Studt
Joseph E. Tix
Daniel P. Ross
Mark T. Weinberger
Original Assignee
Graco Minnesota 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 Graco Minnesota Inc. filed Critical Graco Minnesota Inc.
Publication of WO2014172352A1 publication Critical patent/WO2014172352A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/16—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed
    • B05B7/166—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the material to be sprayed being heated in a container
    • B05B7/1666—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas incorporating means for heating or cooling the material to be sprayed the material to be sprayed being heated in a container fixed to the discharge device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
    • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
    • B05B7/1404—Arrangements for supplying particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/10—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material
    • B05C11/1042—Storage, supply or control of liquid or other fluent material; Recovery of excess liquid or other fluent material provided with means for heating or cooling the liquid or other fluent material in the supplying means upstream of the applying apparatus

Definitions

  • the present disclosure relates generally to systems for dispensing hot melt adhesive. More particularly, the present disclosure relates to a system and method for cooling parts of a hot melt delivery system.
  • Hot melt dispensing systems are typically used in manufacturing assembly lines to automatically disperse an adhesive used in the construction of packaging materials such as boxes, cartons and the like.
  • Hot melt dispensing systems conventionally comprise a material tank, heating elements, a pump and a dispenser. Solid polymer pellets are melted in the tank using a heating element before being supplied to the dispenser by the pump. Because the melted pellets will re-solidify into solid form if permitted to cool, the melted pellets must be maintained at temperature from the tank to the dispenser. This typically requires placement of heating elements in the tank, the pump and the dispenser, as well as heating any tubing or hoses that connect those components.
  • conventional hot melt dispensing systems typically utilize tanks having large volumes so that extended periods of dispensing can occur after the pellets contained therein are melted.
  • the large volume of pellets within the tank requires a lengthy period of time to completely melt, which increases start-up times for the system.
  • a typical tank includes a plurality of heating elements lining the walls of a rectangular, gravity-fed tank such that melted pellets along the walls prevents the heating elements from efficiently melting pellets in the center of the container.
  • the extended time required to melt the pellets in these tanks increases the likelihood of "charring” or darkening of the adhesive due to prolonged heat exposure.
  • a hot melt dispensing system includes a melt system for heating adhesive pellets into liquefied adhesive pellets.
  • the melt system includes an inlet for receiving a supply of adhesive pellets.
  • the hot melt dispensing system further includes a feed hose for feeding adhesive pellets into the melt system and a feed inlet assembly connecting the feed hose to the melt system.
  • the feed inlet assembly includes a venturi, a compressed air inlet for feeding compressed air into the venturi, and a venturi outlet connecting the venturi to the inlet of the melt system.
  • a method of operating a hot melt dispensing system includes transporting adhesive pellets from a container through a feed hose into a venturi and flowing compressed air into the venturi through a compressed air inlet. The method further includes transporting the adhesive pellets through the venturi and into an inlet of a melt system for heating the adhesive pellets.
  • FIG. 1 is a schematic view of a system for dispensing hot melt adhesive.
  • FIG. 2 is a side schematic view of a melt system used in the system of FIG. 1.
  • FIG. 3 is a cross-sectional view of a feed inlet assembly used in the system of
  • FIG. 1 is a schematic view of system 10, which is a system for dispensing hot melt adhesive.
  • System 10 includes cold section 12, hot section 14, air source 16, air control valve 17, and controller 18.
  • cold section 12 includes container 20 and feed assembly 22, which includes vacuum assembly 24, feed hose 26, and inlet 28.
  • hot section 14 includes melt system 30, pump 32, and dispenser 34.
  • Air source 16 is a source of compressed air supplied to components of system 10 in both cold section 12 and hot section 14.
  • Air control valve 17 is connected to air source 16 via air hose 35A, and selectively controls air flow from air source 16 through air hose 35B to vacuum assembly 24 and through air hose 35C to motor 36 of pump 32.
  • Air hose 35D connects air source 16 to dispenser 34, bypassing air control valve 17.
  • Controller 18 is connected in communication with various components of system 10, such as air control valve 17, melt system 30, pump 32, and/or dispenser 34, for controlling operation of system 10.
  • Container 20 can be a hopper for containing a quantity of solid adhesive pellets for use by system 10. Suitable adhesives can include, for example, a thermoplastic polymer glue such as ethylene vinyl acetate (EVA) or metallocene.
  • Feed assembly 22 connects container 20 to hot section 14 for delivering the solid adhesive pellets from container 20 to hot section 14.
  • Feed assembly 22 includes vacuum assembly 24 and feed hose 26. Vacuum assembly 24 is positioned in container 20. Compressed air from air source 16 and air control valve 17 is delivered to vacuum assembly 24 to create a vacuum, inducing flow of solid adhesive pellets into inlet 28 of vacuum assembly 24 and then through feed hose 26 to hot section 14.
  • Feed hose 26 is a tube or other passage sized with a diameter substantially larger than that of the solid adhesive pellets to allow the solid adhesive pellets to flow freely through feed hose 26. Feed hose 26 connects vacuum assembly 24 to hot section 14.
  • Solid adhesive pellets are delivered from feed hose 26 to melt system 30.
  • Melt system 30 can include a container (not shown) and resistive heating elements (not shown) for melting the solid adhesive pellets to form a hot melt adhesive in liquid form.
  • Melt system 30 can be sized to have a relatively small adhesive volume, for example about 0.5 liters, and configured to melt solid adhesive pellets in a relatively short period of time.
  • Pump 32 is driven by motor 36 to pump hot melt adhesive from melt system 30, through supply hose 38, to dispenser 34.
  • Motor 36 can be an air motor driven by pulses of compressed air from air source 16 and air control valve 17.
  • Pump 32 can be a linear displacement pump driven by motor 36.
  • dispenser 34 includes manifold 40 and module 42.
  • Hot melt adhesive from pump 32 is received in manifold 40 and dispensed via module 42.
  • Dispenser 34 can selectively discharge hot melt adhesive whereby the hot melt adhesive is sprayed out outlet 44 of module 42 onto an object, such as a package, a case, or another object benefiting from hot melt adhesive dispensed by system 10.
  • Module 42 can be one of multiple modules that are part of dispenser 34.
  • dispenser 34 can have a different configuration, such as a handheld gun-type dispenser.
  • System 10 can be part of an industrial process, for example, for packaging and sealing cardboard packages and/or cases of packages.
  • system 10 can be modified as necessary for a particular industrial process application.
  • pump 32 can be separated from melt system 30 and instead attached to dispenser 34.
  • Supply hose 38 can then connect melt system 30 to pump 32.
  • FIG. 2 is a side schematic view of melt system 30.
  • melt system 30 includes melter base 46, melter 48, band heater 50, thermal break 52, feed cap 54, sensor tower 56, and level sensor 58.
  • Melter 48 is positioned on and supported by melter base 46.
  • Melter base 46 includes bolt holes 60 for connecting melter base 46 to pump 32 (shown in FIG. 1).
  • Melter base 46 also includes outlet 62 to allow fluid flow of hot melt adhesive from melter 48 to pump 32.
  • Band heater 50 is attached to melter 48 for heating melter 48.
  • Band heater 50 is an electrically powered resistive heating element wrapped circumferentially around and in contact with melter 48 for conducting heat from band heater 50 to melter 48.
  • melter 48 is a container for melting adhesive pellets into a liquid state, and for holding both the adhesive pellets in a solid state and the hot melt adhesive in the liquid state.
  • melter 48 is substantially cylindrical.
  • melter 48 can have a different shape, such as oval, square, rectangular, or another shape suitable for the application.
  • Thermal break 52 is a connector that connects feed cap 54 to melter 48.
  • Thermal break 52 can be made of silicone or another material having a relatively low thermal conductivity.
  • thermal break 52 can be omitted and feed cap 54 can be connected to melter 48 either directly or via another suitable mechanism.
  • Feed cap 54 is a cover for melter 48 and melt system 30, connected to a top of melter 48.
  • feed cap 54 can be made of a polymer material.
  • feed cap 54 can be made of another material, such as a metal.
  • Feed cap 54 includes cap top 64 and cap side 66.
  • cap side 66 is substantially cylindrical and cap top 64 has a substantially circular shape when viewed from above.
  • Feed cap 54 can have a shape that is similar to that of melter 48, or can have a shape that differs from that of melter 48.
  • Feed inlet 68 is positioned on cap top 64 and includes inward projection 70, extending downward from cap top 64.
  • Feed inlet 68 is a hole through cap top 64 and is connected to feed inlet assembly 71 for receiving a supply of adhesive pellets and air supplied by feed assembly 22 (shown in FIG. 1).
  • Feed inlet assembly 71 includes venturi outlet hose 72, venturi 74, compressed air inlet 76, and feed funnel inlet 78.
  • a supply of adhesive pellets flows through feed hose 26 of feed assembly 22 and into feed inlet assembly 71 through feed funnel inlet 78.
  • the supply of adhesive pellets flows out of feed inlet assembly 71 through venturi outlet hose 72 and flows into feed inlet 68.
  • Feed inlet assembly 71 allows the supply of adhesive pellets to be delivered to melter 48 without sticking to components of feed assembly 22. Dry adhesive pellets are typically kept at room temperature in container 20, but the adhesive pellets may come in contact with a section of feed hose 26 that is heated up due to the proximity of the section to melter 48. As a result, the adhesive pellets may begin to melt and stick to the walls of feed hose 26, which can create a restriction and plug feed hose 26, preventing the adhesive pellets from reaching melter 48. Feed inlet assembly 71 provides active cooling with venturi 74 to prevent hot melt from building up on the walls of feed hose 26.
  • Feed inlet assembly 71 allows adhesive pellets to flow freely from container 20 to melter 48 without creating any restrictions in tubing such as feed hose 26 near melter 48.
  • Feed inlet assembly is located above melter 48 to counteract heat transfer from melter 48 to feed components and allow the temperature of the adhesive pellets to remain significantly below the softening point of the adhesive. This eliminates the need for maintenance of feed components, such as removing built up hot melt from feed hose 26 near melter 48.
  • FIG. 3 is a cross-sectional view of feed inlet assembly 71.
  • Feed inlet assembly 71 includes venturi outlet hose or tube 72, venturi 74, compressed air inlet 76, feed funnel inlet 78, plenum 80, channels 82, feed funnel outlet 84, and o-ring 86.
  • Feed hose 26 extends into feed funnel inlet 78.
  • Feed funnel inlet 78 extends into venturi 74.
  • Adhesive pellets are fed through feed hose 26, into feed funnel inlet 78, through feed funnel outlet 84, and into venturi outlet hose 72. Adhesive pellets then flow through feed inlet 68 into melt system 30. O-ring 86 provides sealing between venturi 74 and feed funnel inlet 78.
  • Plenum 80 is a circumferential air channel, which connects to channels 82, longitudinal, circumferentially spaced slots that form air passages in conjunction with the inner surface of venturi 74. Compressed air is fed via compressed air inlet 76 into plenum 80. The air flows through plenum 80 and into channels 82 as shown by the dotted lines and arrows in FIG. 3. Plenum 80 and channels 82 create a cone in which compressed air is blown to the center of feed funnel outlet 84 and venturi outlet hose 72, keeping adhesive pellets in the center and away from the walls of feed funnel outlet 84 and venturi outlet hose 72.

Landscapes

  • Coating Apparatus (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Nozzles (AREA)

Abstract

La présente invention concerne un système de distribution de produit thermofusible qui comprend un système de fusion pour chauffer des pastilles d'adhésif en pastilles d'adhésif liquéfié. Le système de fusion comprend une entrée pour recevoir une alimentation en pastilles d'adhésif. Le système de distribution de produit thermofusible comprend en outre un tuyau flexible d'alimentation pour réaliser l'alimentation en pastilles d'adhésif dans le système de fusion et un ensemble entrée d'alimentation qui raccorde le tuyau flexible d'alimentation au système de fusion. L'ensemble entrée d'alimentation comprend un venturi, une entrée d'air comprimé pour réaliser l'alimentation en air comprimé dans le venturi, et une sortie de venturi qui raccorde le venturi à l'entrée du système de fusion.
PCT/US2014/034168 2013-04-16 2014-04-15 Système et procédé de distribution de produit thermofusible à refroidissement par air WO2014172352A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201361812573P 2013-04-16 2013-04-16
US61/812,573 2013-04-16

Publications (1)

Publication Number Publication Date
WO2014172352A1 true WO2014172352A1 (fr) 2014-10-23

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TW (1) TW201501815A (fr)
WO (1) WO2014172352A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140116535A1 (en) * 2012-10-25 2014-05-01 Graco Minnesota Inc. Hot melt level sensor and sensor housing
WO2017048690A1 (fr) * 2015-09-14 2017-03-23 Sikorsky Aircraft Corporation Raccord de mise à l'air libre du carburant, système de mise à l'air libre ayant un raccord de mise à l'air libre du carburant, et procédé
US20180126410A1 (en) * 2016-11-10 2018-05-10 Nordson Corporation Hot melt adhesive system and associated methods

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050067311A (ko) * 2003-12-27 2005-07-01 이서구 핫 멜트 분사장치
JP2006117361A (ja) * 2004-10-20 2006-05-11 Asahi Breweries Ltd ホットメルト接着剤の搬送装置および方法
US20090095730A1 (en) * 2007-10-12 2009-04-16 Nordson Corporation Adhesive dispensing system with spaced ports and related methods
US20120000161A1 (en) * 2009-02-24 2012-01-05 Gala Industries, Inc. Continuous bagging processes and systems
US20120247665A1 (en) * 2006-01-17 2012-10-04 Nordson Corporation Apparatus And Method For Melting And Dispensing Thermoplastic Material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050067311A (ko) * 2003-12-27 2005-07-01 이서구 핫 멜트 분사장치
JP2006117361A (ja) * 2004-10-20 2006-05-11 Asahi Breweries Ltd ホットメルト接着剤の搬送装置および方法
US20120247665A1 (en) * 2006-01-17 2012-10-04 Nordson Corporation Apparatus And Method For Melting And Dispensing Thermoplastic Material
US20090095730A1 (en) * 2007-10-12 2009-04-16 Nordson Corporation Adhesive dispensing system with spaced ports and related methods
US20120000161A1 (en) * 2009-02-24 2012-01-05 Gala Industries, Inc. Continuous bagging processes and systems

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140116535A1 (en) * 2012-10-25 2014-05-01 Graco Minnesota Inc. Hot melt level sensor and sensor housing
US9267647B2 (en) * 2012-10-25 2016-02-23 Graco Minnesota Inc. Hot melt level sensor and sensor housing
WO2017048690A1 (fr) * 2015-09-14 2017-03-23 Sikorsky Aircraft Corporation Raccord de mise à l'air libre du carburant, système de mise à l'air libre ayant un raccord de mise à l'air libre du carburant, et procédé
EP3350010A4 (fr) * 2015-09-14 2019-04-24 Sikorsky Aircraft Corporation Raccord de mise à l'air libre du carburant, système de mise à l'air libre ayant un raccord de mise à l'air libre du carburant, et procédé
US10793416B2 (en) 2015-09-14 2020-10-06 Sikorsky Aircraft Corporation Fuel vent connector, venting system having fuel vent connector, and method
US20180126410A1 (en) * 2016-11-10 2018-05-10 Nordson Corporation Hot melt adhesive system and associated methods
WO2018128680A3 (fr) * 2016-11-10 2018-08-16 Nordson Corporation Système d'adhésif thermofusible et procédés associés
US10610883B2 (en) 2016-11-10 2020-04-07 Nordson Corporation Hot melt adhesive system and associated methods

Also Published As

Publication number Publication date
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