US3892339A - Equipment for point by point application of an adhesive - Google Patents

Equipment for point by point application of an adhesive Download PDF

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Publication number
US3892339A
US3892339A US412829A US41282973A US3892339A US 3892339 A US3892339 A US 3892339A US 412829 A US412829 A US 412829A US 41282973 A US41282973 A US 41282973A US 3892339 A US3892339 A US 3892339A
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United States
Prior art keywords
piston
cylinder
compression stroke
during
adhesive
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Expired - Lifetime
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US412829A
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English (en)
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Horst Idler
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    • 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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • 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
    • 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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/001—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work incorporating means for heating or cooling the liquid or other fluent 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
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/08—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation
    • B05C9/14—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material and performing an auxiliary operation the auxiliary operation involving heating or cooling

Definitions

  • a low pressure is created in the cylinder dur- [56] References cued ing the beginning phase of the return stroke which UNITED STATES PATENTS communicates with the nozzle thereby retracting the adhesive disposed therein 2,319,233 5/1943 Hoppe 222/181 3,130,876 4/1964 Baker 118/410 X 6 Claims, 2 Drawing Fi ures EQUIPMENT FOR POINT BY POINT APPLICATION OF AN ADHESIVE
  • the invention concerns a piece of equipment for the point by point application of an adhesive, especially a hot melting or thermoplastic adhesive, onto a structure, by which the adhesive is pressed from a feeder device to an application nozzle, and the adhesive exiting from the nozzle is guided by a control device.
  • the invention is based on the intention to construct a device as stated in the beginning, which is simple in its structure and without problems during operation, even when a hot melting adhesive is used.
  • This problem can be solved by the discovery that a piston pump is used as feeder device, and that the control device consists of an open passage that is created within the connection between cylinder space and application nozzle only during the end phase of the compression stroke and the thereupon following beginning phase of the backstroke of the piston.
  • the high working speed is partly based on the fact that the piston pump renders it possible that the pressure in the cylinder space, which presses the adhesive on its way to the application nozzle, can, in a simple way, be regulated for the most favorable results.
  • An especially uncomplicated construction of the device can be achieved, when the channel leading from the piston pump to the application nozzle leads into the cylinder space of the piston pump within the piston channel, and the piston acting as control part has a connective channel, which connects the channel leading to the application nozzle during the latter phase of the compression stroke and the thereupon following beginning phase of the backstroke with the cylinder space.
  • the connective channel shows, if favorably constructed, a first section which leads from the piston base in axial direction into the piston, and a second section which leads from the outer protective layer or surface of the piston to the first section, whereby the opening of the second section, which is inside the outer protective layer of the piston, is formed as a slot which extends axially along the surface of the piston.
  • the position and length of this slot determine the time period, in which the adhesive can flow from the cylinder space to the application nozzle. It is of further advantage that, with the compression stroke, the adhesive is directly pressed into the connective channel, which insures, that it is always completely filled.
  • the piston pump renders it possible that, in a simple manner, the adhesive flow can steer itself from a supply container.
  • an adhesive supply channel can be provided which connects the piston pump with the adhesive supply container and which ends at a point in the piston channel of the cylinder that is completely covered by the piston after a starting movement of the compression stroke.
  • the adhesive flow is interrupted after the cylinder space has been filled as soon as the piston moves, during the compression stroke, somewhat from the stationary position and the pressure in the cylinder space starts to increase noticeably.
  • the cylinder space should be connected with the adhesive outflow channel which should, preferably, be equipped with an adjustable high pressure valve for the opening pressure.
  • the high pressure valve permits the selection of the piston in a size that allows, independently from the filling condition of the cylinder space at the outset of the compression stroke, that the required pressure in the cylinder space is definitely reached before the outflow of the adhesive from the cylinder space to the application nozzle is released. Since the high pressure valve can be adjusted, the pressure can be regulated for the most favorable dose.
  • the outflow line is so constructed that it can, at the same time, act as the return line leading to the adhesive supply container, so that the surplus adhesive can be reused.
  • this construction guarantees that the adhesive does not cool off.
  • FIG. 1 A side view of the construction example.
  • FIG. 2 An enlarged and incompletely presented longitudinal section of the construction example.
  • a device for the point by point application of a hot melting adhesive onto a surface shows, as in FIG. 1, a funnel-shaped supply container which can be heated electrically.
  • the temperature can be selected by means of a thermostat not shown here either and can be kept as desired.
  • a cylinder 2 is attached to the lower end of the supply container 1, the longitudinal axis of which lies horizontally in the construction example.
  • the cylinder 2 is also equipped with an electrical heater. With the aid of a regulator, for which the net value of the temperatureis supplied by-a temperature feeler 3, the temperature can be regulated to achieve the desired nominal value.
  • a carrier 4 which is tightly connected withthe cylinder 2, follows, to which a electric starting magnet 5 is connected horizontally'.
  • the piston of this magnet S is connected, over connective parts 6, with a cylindrical piston 7, which is axially movable in cylinder 2 in a longitudinal direction in a'bore 8 of cylinder 2.
  • That section of bore 8 which faces the starting magnet 5, is enlarged in diameter and receives a gasket packet 9 which is being held under axial pressure by means of a screwed-in bushing 10, into the end section.
  • the point at which the rectilinear and vertically running adhesive supply channel 11 enters bore 8 has been selected so that the piston 7 opens the outlet totally when it is completely withdrawn. This assures a speedy and complete filling with hot melting adhesive of the cylinder space formed by bore 8.
  • That part of bore 8 which is turned away from the el'ectro-magnet 5 is likewise enlarged and equipped with a sleeve into which a valve box 12 has been screwed.
  • the valve box 12 has in its base, which faces piston 7, a central passage bore 13, against which, from the inside of valve box 12, by means of a coil spring 14, a valve structure in shape of a ball 15 is being pressed.
  • the coil spring 14, on the other hand, is supported by an adjustment screw 16, which is guided in a central coil bore of the valve box 12, and can be adjusted as desired by means of an adjusting nut 17.
  • a return bore 18 leads into the interior space of valve box 12 which receives ball 15 and coil spring 14, this return channel leads to supply container :1. Itis thereby possible to return the hot melting adhesive from the cylinder space into supply container 1 .over the high pressure valve consisting of parts 12 and 16, whereby the pressure, at which the high pressure valve opens, can be adjusted with the aid of screw 16.
  • An application nozzle 19 which has an opening suitable, in form and diameter, to apply the hot melting adhesive in a point by point fashion, is, as FIGS. 1 and 2 show, screwed into the wall of cylinder 2 that points downward, which, in our construction example, shows relatively large dimensions.
  • a short bore 20 the diameter of which is considerably smaller than the diameter of bore 8 leads to the latten Bore 20 leads into the channel of piston 7 at a point which is covered completely by the piston when the piston is in a completely retracted position, as shown in FIG. 2.
  • a connection of bore 20 with the cylinder space is only effected when-piston7 has almost completed its compression-stroke, which means, thatit is not too far from the point at which it changes its direction.
  • a short longitudinal slot 21 is positioned at the opening of bore 20, into the base of which a bore 22, across the piston, has been drilled, which extends into a central longitudinal bore 23 from the front of piston 7 which faces the high pressure valve.
  • the length of the longitudinal slot 21 has been selected in a manner that the connection of bore 20, through bores 22 and 23, with the cylinder space, remains intact until the piston 7 reaches, during return stroke, that position at which it,
  • the device works in the following manner: When the piston 7 is in the totally retracted position,
  • the cylinder space which is bordered on one side by the piston, and on the other side by the high pressure valve, is filled with hot melting adhesive.
  • piston 7 closes, during its startingmovement, the adhesive supply channel 11.
  • the pressure in the cylinder space and also in the longitudinal bore 23, the crosswise bore 22 and the longitudinal slot 21 can be increased to the point, at which the highpressure valve 12 opens.
  • the piston stroke is so regulatedthat maximum pressure can be achieved before the piston frees the connection to bore 20 through the longitudinal slot 21. This assures that the hot melting adhesive is being pressed into the application nozzle 19 with the desired pressure, and exitsfrom the nozzle as soon as bore 20 communicates with the longitudinal slot 21.
  • the return stroke begins immediately. Since the adhesive supply channel 11 is still closed by the piston, and the high pressure valve closes immediatelywhen a decrease in pressure occurs, the return stroke has as a result that a low pressure occurs in the cylinder space which has an effect on bores 23 and 22, the longitudinal slot 21, and bore 20 in a manner, by which the hot melting adhesive stream exiting from theapplication nozzle is, within the shortest time period, completely cut-off, since the adhesive is beingretracted into the application nozzle because of the low pressure.
  • the hot melting adhesive stream flowing from the application nozzle can be disrupted within the shortest time period, and since the pressure which moves the hot melting adhesive through the application nozzle can be completely controlled, the amount dispensed by the application nozzle can be regulated very precisely. Besides, the speedy disruption of the hot melting adhesive stream at the application nozzle warrants a very high working speed ofthe equipment.
  • Apparatus for the point bypoint application of a viscous substance such as a thermoplastic adhesive
  • a feeder device including a piston slidable in a cylinder, means for reciprocating said piston through a compression stroke and a return strokein a predetermined timed work cycle, means for introducing the substance into the interior of said cylinder during the return stroke of said piston, means connecting the interior of said cylinderwith an application nozzle whereby the substance is moved under pressure from said cylinder to said nozzle during the compression stroke of said piston, means blocking said connecting means except during the end phase of the compression stroke and the beginning phase of the return stroke of said piston, said connecting means including a conduit extending through said piston into the interior of said cylinder and a bore extending through said cylinder communicating with said nozzle, said conduit including a first section which extends axially through said piston and a second section extending transversely from said first section to an opening in the outer surface of said piston, said opening being defined by a slot extending axially along the surface of said piston and adapted
  • Apparatus as defined in claim 1 further including a storage container for the viscous substance, and a supply channel extending from said container into the interior of said cylinder through an opening which is adapted to be closed by the outer surface of said piston during the compression stroke and beginning phase of the return stroke of the piston.
  • said high pressure valve includes a valve box mounted in said cylinder and axially aligned with said piston at a position corresponding to the end phase of the compression stroke thereof, a ball valve disposed in said box and adapted to close a central passage therethrough, means for biasing said ball valve in the closed position, and means for adjusting the degree of force applied by said biasing means.

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  • Coating Apparatus (AREA)
  • Reciprocating Pumps (AREA)
US412829A 1972-11-04 1973-11-05 Equipment for point by point application of an adhesive Expired - Lifetime US3892339A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2254033A DE2254033A1 (de) 1972-11-04 1972-11-04 Vorrichtung zum punktweisen auftragen eines klebstoffes

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US3892339A true US3892339A (en) 1975-07-01

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US412829A Expired - Lifetime US3892339A (en) 1972-11-04 1973-11-05 Equipment for point by point application of an adhesive

Country Status (5)

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US (1) US3892339A (esLanguage)
DE (1) DE2254033A1 (esLanguage)
FR (1) FR2205831A5 (esLanguage)
GB (1) GB1406963A (esLanguage)
IT (1) IT997336B (esLanguage)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4119058A (en) * 1976-03-11 1978-10-10 Alfred Schmermund Glue applicators
US4225638A (en) * 1979-04-16 1980-09-30 The D. L. Auld Company Method and apparatus for flow coating with suck-back control
US4489857A (en) * 1982-03-22 1984-12-25 Bobrick Washroom Equipment, Inc. Liquid dispenser
US4535919A (en) * 1981-08-19 1985-08-20 Nordson Corporation Hot melt adhesive system
US5099090A (en) * 1988-05-11 1992-03-24 Ariel Electronics, Inc. Circuit writer
EP0720872A1 (en) * 1994-12-27 1996-07-10 Matsushita Electric Industrial Co., Ltd. Intermittent coating apparatus, intermittent coating method and manufacturing method of battery electrodes, and non aqueous electrolyte cell

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4850514A (en) * 1982-12-16 1989-07-25 Nordson Corporation Constant pressure intermittent fluid dispenser
US4613062A (en) * 1984-04-17 1986-09-23 Continental Can Company, Inc. Hot melt material dispenser
US4634027A (en) * 1985-01-04 1987-01-06 Mvm Valve Co., Inc. Liquid dispensing apparatus and an anti-drip valve cartridge therefor
CA2081499A1 (en) * 1991-11-01 1993-05-02 Wesley Fort Method and apparatus for dispensing multiple beads of viscous liquid
EP0928634A1 (de) * 1998-01-12 1999-07-14 Esec Sa Dispensdüse für einen Die Bonder
DE102004058542A1 (de) 2004-12-03 2006-06-08 Nordson Corporation, Westlake Rotationsauftragskopf und Etikettieranlage zum Aufbringen von Etiketten
US7771556B2 (en) 2005-07-01 2010-08-10 Nordson Corporation Apparatus and process to apply adhesive during labeling operations
US8171973B2 (en) 2008-01-29 2012-05-08 Nordson Corporation Nozzle and related apparatus and method for dispensing molten thermoplastic material

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US968498A (en) * 1910-01-24 1910-08-23 Arthur Arbib Liquid-soap dispenser.
US2319233A (en) * 1941-03-10 1943-05-18 Charles W Hoppe Soap dispenser
US3130876A (en) * 1962-01-19 1964-04-28 Kamborian Jacob S Dispensing apparatus for thermoplastic adhesive
US3248020A (en) * 1964-10-09 1966-04-26 Fischer & Co H G High pressure source for viscous liquids, especially those containing suspended abrasive particles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US968498A (en) * 1910-01-24 1910-08-23 Arthur Arbib Liquid-soap dispenser.
US2319233A (en) * 1941-03-10 1943-05-18 Charles W Hoppe Soap dispenser
US3130876A (en) * 1962-01-19 1964-04-28 Kamborian Jacob S Dispensing apparatus for thermoplastic adhesive
US3248020A (en) * 1964-10-09 1966-04-26 Fischer & Co H G High pressure source for viscous liquids, especially those containing suspended abrasive particles

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4119058A (en) * 1976-03-11 1978-10-10 Alfred Schmermund Glue applicators
US4225638A (en) * 1979-04-16 1980-09-30 The D. L. Auld Company Method and apparatus for flow coating with suck-back control
US4535919A (en) * 1981-08-19 1985-08-20 Nordson Corporation Hot melt adhesive system
US4489857A (en) * 1982-03-22 1984-12-25 Bobrick Washroom Equipment, Inc. Liquid dispenser
US5099090A (en) * 1988-05-11 1992-03-24 Ariel Electronics, Inc. Circuit writer
EP0720872A1 (en) * 1994-12-27 1996-07-10 Matsushita Electric Industrial Co., Ltd. Intermittent coating apparatus, intermittent coating method and manufacturing method of battery electrodes, and non aqueous electrolyte cell
US5824156A (en) * 1994-12-27 1998-10-20 Matsushita Electric Industrial Co., Ltd. Intermittent coating apparatus, intermittent coating method and manufacturing method of battery electrodes, and non aqueous elecrolyte cell

Also Published As

Publication number Publication date
GB1406963A (en) 1975-09-17
FR2205831A5 (esLanguage) 1974-05-31
DE2254033A1 (de) 1974-05-16
IT997336B (it) 1975-12-30

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