US3908587A - Apparatus for impregnating corrugated cardboard - Google Patents

Apparatus for impregnating corrugated cardboard Download PDF

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Publication number
US3908587A
US3908587A US321841A US32184173A US3908587A US 3908587 A US3908587 A US 3908587A US 321841 A US321841 A US 321841A US 32184173 A US32184173 A US 32184173A US 3908587 A US3908587 A US 3908587A
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United States
Prior art keywords
liquid
liquid ring
impregnating agent
pumps
impregnating
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Expired - Lifetime
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US321841A
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English (en)
Inventor
Gunther Lau
Edmund Bradatsch
Hermann J Brandl
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/08—Rearranging applied substances, e.g. metering, smoothing; Removing excess material
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/60—Waxes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/22—Addition to the formed paper
    • D21H23/50—Spraying or projecting

Definitions

  • the impregnant is directly injected into the interior of the corrugated cardboard via nozzles of the feeding or application device.
  • the device is provided at the inlet of the corrugated board with a vacuum channel.
  • the liquid impregnating agent is either injected into the interior of the corrugated board as a full stream and is suctioned off by a vaccum pump operating on the other longitudinal edge of the board or, alternatively, the impregnant is mixed with air according to the pistol principle, injected into the corrugated cardboard interior, and is likewise suctioned or drawn by vacuum pressure to the other longitudinal edge of the corrugated cardbaord by means of a vacuum pump.
  • suction or vacuum chambers On the suction side of the corrugated cardboard, there are arranged several suction or vacuum chambers which are separated from each other and sealed along the longitudinal edge of the board.
  • the suction chambers are connected to one or several vacuum pumps.
  • a separator for the impregnant Connected ahead of the pumps is a separator for the impregnant.
  • So-called liquid ring pumps have been utilized as these pumps with the liquid ring formed by water.
  • a separator Connected at the outlet side of the pump, a separator is employed whose function is to separate the entrained water exiting at the pressure side of the liquid ring, together with air.
  • the separated water is treated as lost water.
  • the water lost from the liquid ring of the pump has to be replaced by fresh water.
  • each suction channel is not acted upon by a separate pump so that the suction channels are influenced by each other.
  • separators have to be connected ahead of the pumps. The number of required separators unnecessarily raises the cost of the plant and, in addition, the separators are not capable of completely separating the liquid impregnating agent, such as wax, and keep it fully from entering the impregnation channel. This in turn results in a high probability of failure of the liquid ring pump when actuated by a water ring.
  • an apparatus for impregnating a horizontally advancing cardboard web which succeeds in providing excellent vacuum pressure or a suction effect onto the cardboard web while achieving complete separation of the impregnating agent from the suctioned-off impregnating agent stream in a smooth, trouble-free operation.
  • the invention accomplishes this objective in that the liquid ring for the liquid ring pump utilizes the liquid impregnating agent itself, and by utilizing several liquid ring pumps, separated from each other on the suction side, and connected to a common separator on the pressure side.
  • the fluid impregnating agent such as wax
  • the impregnating agent in used for the liquid ring of the liquid ring pump ensures that the impregnating agent cannot cause disorders, with regard to the liquid ring pump.
  • the excess irnpregnant, which is not used for the liquid ring pump, is removed from the pump.
  • the impregnant By using a separator positioned downstream from the pumps such as by positioning a separator on the output pressure side of the pumps, the impregnant, such as wax, is separated from the air drawn in from the corrugated board.
  • the separators connected ahead of the pumps in the conventional impregnating system can be dispensed with.
  • the separated impregnant may, if required, be re-cycled for maintaining the liquid ring necessary within the pumps. This results in a no-loss cycle.
  • the invention provides for keeping the corrugated cardboard webs acted upon by the individual pumps via suction chambers, independently of each other.
  • the suc tioned-off air-impregnating agent mixture is affected by pressure, and is preferably cooled.
  • the impregnating agent which has been removed by vacuum pressure is returned to a preparation container and is heated for its next intended use. In this manner the separated excess impregnating agent can be reused at the required temperature.
  • the apparatus for implementing the process is characterized in that there are provided for establishing the vacuum or suction condition for the air-impregnating agent mixture, several liquid ring pumps, which have their respective vacuum inputs arranged in parallel flow relationship and which are each connected to one of the suction chambers associated with one longitudinal edge, and is that on the pressure side the pumps feed a common separator, and in that each pump is in fluid communication with the common separator in order to maintain its liquid ring.
  • the separator is maintained by an overflow device and is kept at a constant overflow level. This is necessary in order to keep the pressure of the impregnating agent which is being returned to the pumps at a substantially constant level.
  • a temperature control means in the form of either a cooling or heating device is connected ahead of the separator. This makes it possible to avoid unnecessary increase in the pump temperature caused by the existence of the impregnating agent in the cycle.
  • a storage tank is connected at the outlet of the separator which also serves as a discharge container for the entire system, and is regulated on the basis of its level.
  • a further embodiment of the present invention provides for an adapter arrangement in which the suction chambers connected ahead of the pumps are movably arranged facing the longitudinal edge of the corrugated board, in which the pumps themselves are stationary, and in which the feeder line of each suction'chamber to the respective pump has inserted in it a hollow slidable valve member.
  • FIG. 1 shows a schematic top plan view of one embodiment of the present invention
  • FIG. 2 shows a top plan view of another embodiment of the present invention
  • FIG. 3 is a flow arrangement of elements on the suction side of the corrugated board of FIG. 1', and,
  • FIG. 4 is an elevational view taken in vertical cross section and illustrating an adapter member used to interconnect adjustably positioned suction chamber members with stationary liquid ring pumps.
  • the corru gated carboard web 1 is advanced horizontally in a corrugated cardboard device and is transported in the direction of arrow I.
  • nozzles, 3 which together with other components not depicted, such as guiding units as disclosed in I-Ioelzinger et al. U.S. Pat. No. 3,699,064 form impregnating device 4.
  • the impregnating agent for example hot wax, is injected by means of nozzles 3 into the interior of the corrugated board.
  • the corrugated board has at least one planar fibrous outer layer cooperating with a serpentine layer to define a succession of transversely extending open-ended flutes.
  • a suction device 5 Opposite from the impregnating device 4 there is a suction device 5.
  • This suction device 5 comprises, for instance, two suction chambers 6 and 7 which can be directed to the other longitudinal edge 8 of corrugated cardboard web 1 and which are sealed against this longitudinal edge.
  • the suction chamber opposite nozzles 3 limits the direct suction path, while suction chamber 7, connected at its outlet, and running in direction I of the cardboard web, limits the after-suction or indirect path.
  • the injected impregnating agent as a result of the cardboard movement from the suction path of the after-suction path will be moving in oblique lines. It is significant that the impregnating agent, injected at longitudinal edge 2, does not completely fill the hollow channels or flutes of the corrugated web 1, so that the application side, along with the impregnating agent, air is suctioned in as a carrier means or means of transportation.
  • pumps 9 and 10 are located on the suction side. Liquid ring pumps are used for these pumps.
  • FIG. 2 shows a variation of this embodiment, wherein on the application side several coating devices 4 are arranged, spaced apart from each other. Opposite therefrom there are, respectively, suction chambers 6 and 7, determining the suction path and the after-suction path. All of the suction chambers 6 determining the direct suction path are connected to a common line, and all suction chambers 7 determining the after-suction path are combined at line 12, to which, in turn, pumps 9 and 10 are connected.
  • feeding lines from suction chambers 6 and 7 are connected via sliding valves 13, 14 and/or ventilation slide members 15, 16 to the suction side of liquid ring pumps 9, 10.
  • the liquid ring pumps are of conventional construction. On the pressure side these pumps 9, 10 are connected to each other.
  • a common exit line 17 is guided to a cooling device 18 in which the air-impregnating agent mixture is being cooled.
  • the exit of the cooling device 18 is connected to separator 19. Separated air can escape via air exhaust 20, and the separated impregnating agent, for example wax, is guided to a collection container 23 with constant level regulation via overflow 21, in Line 22.
  • Liquid ring pumps 9, 10 are, in accordance with the invention, actuated by way of a liquid ring formed by the impregnating agent.
  • the impregnating agent such as wax
  • wax is returned from separator 19 via line 26 and sliding valve 27 to pump 10 or 9, respectively.
  • evacuating lines 28 guided via sliding valve 29 to storage container 23.
  • a clearance line 30 leads from separator 19 via sliding valve 31 to the collection container 23.
  • P and T designate the pressure or temperature measuring points, respectively, necessary for automatic control.
  • a slidable adapter 32 as illustrated in FIG. 4.
  • the suction device as a whole is designated 33. It comprises suction chambers 6, 7.
  • Suction device 33 by means of sliding guides 34, is adjustable and lockable in relationship-to the corrugated cardboard web, not shown.
  • Firmly connected to suction chambers 6, 7 is tube 35 which is slidable within stationary casing 36, which is connected to pump 9, 10, not shown.
  • Packing box 37 seals tube 35 and casing from each other.
  • a flexible connecting piece 38 is inserted into the feeder line leading to pumps 9, 10.
  • suction chamber means arranged along the longi tudinal edge of said board opposite from said application device,
  • each liquid ring pump being in parallel flow relationship with the other vacuum inputs and each being coupled to said suction chamber means for drawing said mixture of air and liquid impregnating agent into said liquid ring pumps, said liquid ring pumps each forming a liquid ring therein with said liquid impregnating agent from said mixture,
  • common separator means having means communicating with the respective pressure output sides of said liquid ring pumps, and
  • Apparatus as defined in claim 1 including means for maintaing the level of said liquid impregnating agent within predetermined limits within said common separator means.
  • Apparatus as defined in claim 1 including temperature control means positioned between the pressure exits of said liquid ring pumps and said common separator means.
  • Apparatus as defined in claim 1 including collec tion container means located downstream from said common separator means with said collection container means being in fluid communication with said common separator means and said liquid ring pumps, and system and level control means coupled to said common separator means, said collection container means and said liquid ring pumps for maintaining said impregnating agent levels therein and for permitting evacuation of said liquid impregnating agent.
  • suction chamber means includes members adjustably positionable along a longitudinal edge of said advancing corrugated board on a side opposite from said application device with said suction chamber members being interconnected by means of a hollow slidable valve member to one of said liquid ring pumps with the latter being mounted stationary.

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US321841A 1972-01-14 1973-01-08 Apparatus for impregnating corrugated cardboard Expired - Lifetime US3908587A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2201743A DE2201743C3 (de) 1972-01-14 1972-01-14 Vorrichtung zum Imprägnieren einer Wellpappenbahn

Publications (1)

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US3908587A true US3908587A (en) 1975-09-30

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DE (1) DE2201743C3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080048353A1 (en) * 2006-08-22 2008-02-28 Stone Prestacao De Servicos Ltda Intercrystaline coloration methods in marbles, granites, limestone and stones in general and products thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1781375A (en) * 1929-09-03 1930-11-11 Lucian F Easton Rotary air pump
US3592159A (en) * 1968-11-21 1971-07-13 L S Heath & Sons Inc Liquid level control
US3669064A (en) * 1970-02-09 1972-06-13 Boise Cascade Corp Apparatus for impregnating corrugated cardboard
US3669067A (en) * 1967-09-29 1972-06-13 Boise Cascade Corp Apparatus for impregnating corrugated cardboard

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD82421A (de) *

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1781375A (en) * 1929-09-03 1930-11-11 Lucian F Easton Rotary air pump
US3669067A (en) * 1967-09-29 1972-06-13 Boise Cascade Corp Apparatus for impregnating corrugated cardboard
US3592159A (en) * 1968-11-21 1971-07-13 L S Heath & Sons Inc Liquid level control
US3669064A (en) * 1970-02-09 1972-06-13 Boise Cascade Corp Apparatus for impregnating corrugated cardboard

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080048353A1 (en) * 2006-08-22 2008-02-28 Stone Prestacao De Servicos Ltda Intercrystaline coloration methods in marbles, granites, limestone and stones in general and products thereof
US20090233078A1 (en) * 2006-08-22 2009-09-17 Stone Prestacao De Servicos Ltda Intercrystaline coloration methods in marbles, granites, limestone and stones in general and products thereof

Also Published As

Publication number Publication date
DE2201743C3 (de) 1981-06-04
DE2201743A1 (de) 1973-07-19
DE2201743B2 (de) 1980-10-23

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