US20090126892A1 - Shoe suction press roll - Google Patents

Shoe suction press roll Download PDF

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Publication number
US20090126892A1
US20090126892A1 US12/123,810 US12381008A US2009126892A1 US 20090126892 A1 US20090126892 A1 US 20090126892A1 US 12381008 A US12381008 A US 12381008A US 2009126892 A1 US2009126892 A1 US 2009126892A1
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US
United States
Prior art keywords
roll
press
suction
pressing
cover
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
Application number
US12/123,810
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English (en)
Inventor
Josef Janzer
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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 Voith Patent GmbH filed Critical Voith Patent GmbH
Assigned to VOITH PATENT GMBH reassignment VOITH PATENT GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: JANZER, JOSEF
Publication of US20090126892A1 publication Critical patent/US20090126892A1/en
Abandoned legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/10—Suction rolls, e.g. couch rolls

Definitions

  • This invention relates to a press device. Also it relates to a method for converting a press device in order to increase the linear force in an individual press nip, and to a multiple-nip press device.
  • Press sections on machines for producing fibrous webs are already known in numerous embodiments from the prior art. Different press concepts are realized depending on the number of press nips to be passed through and on the arrangement and construction of the rolls forming said press nips.
  • the press nips are created by way of two rolls, whereby one of the rolls can be constructed for example as a shoe press roll.
  • From publication EP 1 445 375 A1 there is already known for example a Duo Nipcoflex arrangement.
  • the fibrous web is passed in the region of the press section successively through two press nips which are formed by two press devices in series.
  • the first press device is characterized in that a suction press roll interacts with a shoe press roll.
  • the suction press roll is configured, looking in the vertical direction, as an upper roll and characterized by a rigid, meaning non-flexible rotatable roll cover.
  • a rigid, meaning non-flexible rotatable roll cover To discharge fluid or the water emerging from the fibrous web in the press nip, provision is made on the roll cover for openings which extend from the outer circumference into the roll cover and are discharged out of said cover through channels extending over the width of the roll through the roll cover, whereby the discharging takes place into a suitable end-face receiving box.
  • a compact press arrangement whereby in this case the suction press roll is involved in constructing two press nips, in particular the first and the second press nip arranged successively in the fibrous web running direction.
  • the third roll which together with the suction press roll forms the second press nip, forms together with another suction press roll a third press nip.
  • the passing of the fibrous web between the individual press nips always takes place on the surface of a roll with no free draw.
  • An embodiment of a suction press roll is known from DE 100 22 353 A1.
  • Said embodiment has several channels on the roll cover, whereby each channel has two openings which are arranged offset to each other in the circumferential direction and lead out of the suction press roll, and outside the press nip there is at least one suction apparatus acting on the outer cover face of the roll cover, whereby the distance between the respective openings of the channels in the circumferential direction is selected such that during rotation of the roll cover the suction apparatus always stands in connection to at least a part of the openings momentarily in the press nip via their channels.
  • linear force increases are limited by the shell curvature permissible for the suction press roll cover. If said linear force is to be increased on a press device, it is necessary as a rule in the case of conversions to provide a larger suction press roll diameter, which in part cannot be installed at all or only at great expense in the existing construction space, which is fixed by the presence of additional devices such as ducts, doctor blades and supports, thus making complex conversions necessary or limiting the possibility of a linear force increase.
  • a linear force increase can be achieved in press devices with suction press rolls of identical or smaller size than conventional suction press rolls by equipping the suction press rolls with a compliance compensator.
  • Said compensator is arranged parallel to and in the longitudinal axis of the suction press roll, meaning it extends over the width of the suction press roll.
  • Decisive for a compliance compensator is the provision of a closed surface.
  • the suction press roll includes a perforated roll cover which encloses an interior space, whereby arranged in the interior space is a suction zone which extends at least over a sub-region of the inner circumference of the roll cover in the circumferential direction.
  • a shoe press roll which acts or is made to act against the inner circumference of the roll cover of the suction press roll.
  • the shoe press roll it is possible, as the result of its closed cover, to apply, at the inner circumference of the press cover of the suction press roll, a higher bracing force onto said suction press roll over the width, meaning parallel to the longitudinal axis of the suction press roll, such that a counter-force to the force of the mating roll is generated in this region.
  • a higher bracing force onto said suction press roll over the width meaning parallel to the longitudinal axis of the suction press roll, such that a counter-force to the force of the mating roll is generated in this region.
  • the shoe press roll in the interior space is arranged in the suction zone.
  • the suction region extends parallel to the longitudinal axis of the suction press roll and, looking in the circumferential direction at the inner circumference, over a part of said circumference, whereby the arrangement of the suction zone is effected such that said zone extends, looking in the running direction of the fibrous web, at the inner circumference from a region in front of the press nip to behind said press nip.
  • the shoe press roll forms together with the suction box a pre-suction compartment, which looking in the fibrous web running direction becomes active in front of the press nip, and a holding zone which becomes active behind the press nip, meaning after the exit from said nip.
  • the press cover of the suction press roll itself is equipped with through-openings which extend from the outer circumference of the press cover as far as the inner circumference, thus creating a connection between the outer circumference and the inner circumference of the suction press roll, in particular the suction zone.
  • the shoe press arrangement includes a circulating flexible belt which is pressed by way of a pressing-on unit against the inner circumference of the press cover of the suction roller.
  • said circulating belt separates the suction region of the suction roll from the shoe pressing region and on the other hand it creates a suction zone boundary.
  • the belt is by comparison impermeable and has a closed cover face.
  • suction press roll covers can be used as the suction press roll cover.
  • conventional suction press roll covers which may be available in the case of a conversion, can be used here accordingly for retrofitting.
  • the through-openings extend in radial direction from the outer circumference to the inner circumference, meaning perpendicular to the longitudinal axis of the suction press roll.
  • the shoe press roll integrated in the suction press roll can be a standard version which needs to be modified only with regard to its installation in the suction press roll.
  • the shoe press roll itself includes a pressing-on unit, preferably with a pressing-on element in the form of a press shoe, whose pressing-on face is constructed to be convex and extends partly in the circumferential direction and further over the width, meaning parallel to the longitudinal direction of the press roll.
  • the bracing can be effected for example by way of piston elements, spring devices or pressure accumulator elements on a support element.
  • the flexible press cover of the shoe press roll is made from a wear-free or high wear-resistant material in order to prevent unnecessary replacement of the flexible belt.
  • suction box in the interior space of the press roll is sealed from the inner circumference of the press cover by way of suitable sealing devices.
  • a second embodiment of the inventive solution consists of combining in one press roll two concepts known from the prior art. This is achieved in that the suction device no longer becomes active in the interior space and hence the fluid-gas mix no longer needs to be passed into the interior space of the press cover in order to be discharged from there but is passed directly through the press cover and evacuated preferably at the side in the region of the end faces.
  • the inner face describing the inner circumference of the press cover can be kept closed, whereby the closed construction makes it possible to resort here to pressing-on units which enable the linear force to be established in particular over the width or parallel to the longitudinal axis of the press roll.
  • pressing-on units which include one or a multiplicity of pressing-on elements which become active at the inner circumference or exert a pressure on said inner circumference in the direction of the press nip and hence create a bracing force in relation to the mating roll.
  • a first sub-embodiment provision is made for only one bracing unit.
  • the generatable linear force can be influenced likewise by way of the locally different, in particular zone-based control of the bracing elements, in particular piston elements. As the result, the precision adjustment of the compliance compensator is possible.
  • Passing the fluid-gas mix through the roll cover is advantageous in that the suction zone is not integrated in the roll and therefore the roll compliance does not limit the maximum possible linear force.
  • the passage through the roll cover can be effected in various ways. According to a first embodiment, provision is made for openings which extend from the outer circumference of the roll cover in said cover and are discharged out of said cover via central channels or through-bores into the end-face regions and passed on from there via separate devices, meaning outside the roll.
  • the mating rolls of the inventively constructed suction press rolls can be rolls of various types of construction.
  • the mating roll can be constructed as a so-called Nipcoflex roll, meaning an extended press nip is obtained by passing a flexible roll cover over a concavely/convexly formed press shoe.
  • the mating roll can also be a solid cover roll. This applies analogously also for the second embodiment.
  • inventive solution is used for suction press rolls on press devices for which provision is made for at least two suction press rolls of the same type on one press device.
  • inventive suction press rolls with identical or smaller diameter can be used for the same establishable line forces, which means that a simple replacement of conventional suction press rolls by inventively constructed suction press rolls is also possible for effecting a linear force increase.
  • the inventive solution can be used on a press apparatus, in particular a multiple-nip press apparatus including a first press device and a second downstream press device.
  • the first press device includes a first roll, which together with a second roll as mating roll forms a first press nip and together with a central roll forms a second press nip downstream from the first press nip in the fibrous web running direction, and a third press nip which is constructed between the central roll and a third roll.
  • Downstream from the first press device is a second press device which includes two rolls forming a further fourth press nip.
  • the first roll of the first press device and one roll of the second press device are constructed as suction press rolls, preferably according to the invention.
  • the suction press rolls are identical, as the result of which they can be exchanged and the stocks of spare parts reduced.
  • FIG. 1 shows in a schematic simplified representation a press device with an inventively constructed suction press roll according to the first basic embodiment with an integrated shoe press roll;
  • FIG. 2 shows in a schematic simplified representation a press device with an inventively constructed suction press roll according to a second basic embodiment with an integrated compliance compensator;
  • FIG. 3 shows a further embodiment of an inventive suction press roll according to the second basic embodiment
  • FIG. 4 shows an application of inventively constructed suction press rolls with a multiplicity of consecutive press nips.
  • FIG. 1 there is shown in a schematic simplified representation based on a press device 1 , including a first press roll 2 and a second press roll 3 which together form a press nip 4 , a particularly advantageous inventive embodiment of a suction press roll 5 , which in the case shown conforms to the upper first press roll 2 in the installation position, with an integrated shoe press roll 6 arranged eccentrically to the suction press roll 6 .
  • a fibrous web (not shown here) is passed together with at least one felt belt through the press nip 4 .
  • the suction press roll 5 acting as the first roll 2 has a rigid, meaning stable or inflexible perforated roll cover 7 which encloses an interior space 8 of the suction press roll 5 in the circumferential direction.
  • the roll cover 7 is characterized by an outer circumference 9 and an inner circumference 10 .
  • a shoe press roll 6 is arranged in the interior space 8 .
  • Said shoe press roll is provided at the inner circumference 10 in the installation position in the region of the press nip 4 .
  • the shoe press roll 6 includes a flexible circulating belt 13 and a pressing-on unit 15 arranged in the interior space 14 enclosed by the belt 13 , including at least one or preferably a multiplicity of pressing-on elements 16 which with their surface forming a pressing-on face 18 and orientated toward the inner circumference 17 of the belt 13 can be pressed against said inner circumference.
  • the pressing-on face 18 is constructed to be convexly curved.
  • the pressing-on unit 15 also acts indirectly against the inner circumference 10 of the roll cover 7 of the suction press roll 5 , as the result of which the linear pressure in the press nip 4 is increased via the shoe press roll 6 .
  • the pressing-on unit 15 includes, as already explained, preferably a pressing-on element 16 in the form of a press shoe 19 which braces itself on a stationary supporting element 20 via device 21 for generating the required pressing force, for example in the form of a piston series or at least one, preferably a multiplicity of pressurized compartments.
  • the pressure at the pressing-on element 16 is established via the device 21 between the press shoe 19 and the supporting element 20 .
  • Said establishing of the pressure can be effected over the width, meaning parallel to the longitudinal axis L of the suction press roll 5 steplessly or in steps as well as over the complete width and also on a zone basis.
  • the suction box 12 is arranged such that it quasi encloses the shoe press roll 6 , thereby forming a pre-suction compartment 22 and a holding zone 23 .
  • the circulating belt 13 which is impermeable to liquid and pressure, separates the suction region S of the suction press roll 5 from the region of the shoe press roll 6 and also creates a suction zone boundary. In this case use is made of the fact that a once evacuated suction bore in the form of the through-openings 11 maintains its vacuum in part even when no vacuum is applied.
  • the sealing of the suction box 12 against the inner circumference 10 is effected by way of sealing devices 24 , in particular in the form of sealing rails 25 .
  • the suction press roll 5 is arranged in the press device 1 , looking in the vertical direction, preferably above the second roll 3 . Other arrangements are likewise conceivable. Fluid is picked up via the through-openings 11 , which extend from the outer circumference 9 to the inner circumference 10 , is sucked into the suction box 12 and discharged out of said box.
  • the region on the inlet side between the suction box 12 and the shoe press roll 6 forms a pre-suction compartment 22 while the region of the suction zone S arranged on the outlet side of the press nip 4 acts as a holding zone 23 after the passage through the press nip.
  • the region facing away from the press nip 4 is unaffected by the suction box 12 .
  • the suction box 12 extends in this case over a part of the inner circumference 10 , whereby said sub-region extends from a region in front of the press nip 4 to behind the press nip 4 .
  • the suction region extends in this case preferably over at least a quarter, in particular preferably over half of the inner face of the inner circumference 10 in the circumferential direction.
  • the linear force in the press nip 4 can be varied by the device 21 .
  • a device for controlling the pressing-on force as a function of the linear force to be established is assigned to said device.
  • the press shoe 19 can be lubricated in this case hydrostatically and/or hydrodynamically. Actuation of the pressing-on elements is effected preferably hydraulically. Other embodiments are likewise possible.
  • FIGS. 2 and 3 show in a schematic and highly simplified representation based on a perspective view a first embodiment of a press device 1 with a compliance compensator according to the second basic embodiment.
  • the press device 1 includes two rolls, a first roll 2 and a second roll 3 , whereby the first roll 2 is constructed as a suction press roll 26 and comprises a rigid roll cover 27 .
  • Both press rolls, the first press roll 2 and the second press roll 3 form together a press nip 4 .
  • the mating roll in the form of the second roll 3 can be constructed as various types.
  • Said mating roll can be constructed as a shoe press roll with a flexible press cover with at least one pressing-on unit with a curved surface or as a solid roll 6 .
  • the first roll 2 is constructed as an evacuated roll in the form of the suction press roll 26 .
  • Said suction press roll has, according to a first variant, on the surface of the roll cover 27 openings, in particular bores 28 , which can be evacuated at the side on the end face of the roll cover 27 .
  • bores 28 which extend preferably over the entire width of such a press device 1 , meaning transverse to the machine direction when used on machines for producing fibrous webs, and can be distributed preferably also over the circumference.
  • a central suction channel 29 which interconnects said bores 28 and is coupled to a suction device 30 in the region of the end face of the first press roll 2 , which is shown here only schematically in order to illustrate the function.
  • the bores 28 extend in this case only in the roll cover 27 , meaning from the outer circumference 31 in the direction of the inner circumference 32 of the roll cover 27 but not through it, and the central suction channel 29 extends through the roll cover thickness d 27 of the roll cover 27 . Hence there is no connection between the bores 28 and an interior space 33 enclosed by the roll cover 27 .
  • the inner face describing the inner circumference 32 of the roll cover 27 is preserved as a closed face so that said face can brace itself evenly over the machine width on at least one supporting element 35 .
  • the first press roll 2 includes in addition a pressing-on unit 34 which is arranged within the roll cover 27 , in particular in the interior space 33 , and braces itself on the supporting element 35 .
  • the pressing-on unit includes at least one, preferably several pressing-on elements 36 , preferably in the form of piston elements 37 , which are movable in relation to the face formed by the inner circumference 32 , preferably perpendicular thereto, and are pressable against the inner circumference 32 .
  • the piston elements 37 are arranged parallel to the longitudinal axis L of the suction press roll 26 , whereby said piston elements are controllable individually or jointly in groups.
  • the bracing and the region of increased linear force is created by way of a further second pressing-on unit 39 which is arranged downstream from the first press nip 4 in the belt running direction or fibrous web running direction during operation of the press device 1 at the outer circumference of the roll cover 27 .
  • the further pressing-on unit 39 serves in this case for bracing in the press nip 38 .
  • the pressing-on unit 39 includes either a multiplicity of or one pressing-on element 40 , preferably in the form of a piston element 48 .
  • FIG. 2 shows in this case an example on which optionally another yoke 41 is provided as a support element for the pressing-on unit 39 .
  • Said pressing-on unit has likewise preferably a multiplicity of piston elements which with their face facing the inner circumference 32 of the roll cover 27 become active at the inner circumference 32 of the roll cover 27 .
  • a compliance compensation can be realized through actuation of the pressing-on elements.
  • FIG. 2 shows in this case for example one possibility with a second supporting element 35 and a second pressing-on unit 39 in addition. Other embodiments are possible.
  • FIG. 3 shows analogously a press device 1 according to the second basic embodiment of the inventive solution with a pressing-on unit 34 which becomes active at the inner circumference 32 of the roll cover 27 , which is constructed as a rigid, meaning non-flexible and hence dimensionally stable press cover.
  • the suction press roll 26 in the roll cover 27 has several channels 42 , whereby each channel 42 has at least two openings 43 , 44 which are arranged offset to each other in the circumferential direction and lead out of the suction press roll 26 .
  • the bores extend in this case not in radial direction, as shown in FIG.
  • the second embodiment is characterized by a combination of the known characteristics of a rigid roll cover with openings for the purpose of evacuating or routing the fluid-gas mix through the cover 27 and an arrangement of a pressing-on unit 34 which becomes active at the inner circumference 32 of the roll cover 27 and braces said roll cover via said inner circumference on the supporting element, in particular yoke.
  • FIGS. 1 to 3 present possible embodiments of the suction press rolls.
  • FIG. 4 presents a particularly advantageous use of inventively constructed suction press rolls 5 or 26 in a multiple-nip press apparatus 45 in the form of a Duocentri Nipcofiex press apparatus.
  • FIG. 4 shows in a schematic and highly simplified representation a detail from the press apparatus 45 including a first press device 46 for forming three successively passable press nips together with a first roll 2 or a suction press roll 5 or 26 according to the first or the second embodiment, which together with a further second roll 3 as mating roll forms a first press nip 4 .
  • a central roll 47 which together with the first roll 2 constructed as a suction press roll 5 or 26 forms a further second press nip 38 .
  • the central roll 47 forms together with a roll 49 a third press nip 50 .
  • the fibrous web F is passed between the first press nip 4 and the third press nip 50 respectively along the outer circumference on the individual press rolls 2 , 3 , 47 , 49 , whereby the passing is always performed together with a felt belt, at least in the first and third press nip 4 .
  • the passing of the fibrous web F is effected in the first press nip 4 between two felt belts FB 1 and FB 2 , whereby the first felt belt FB 1 enwraps the suction press roll 26 , 5 and the second felt belt FB 2 as bottom belt enwraps the second roll 3 .
  • the fibrous web F is passed directly along the surface of the central roll 47 and on said surface through the third, single-felted press nip 50 .
  • the fibrous web F is passed through a further second, preferably double-felted press device 51 between the felt belts FB 3 and FB 4 .
  • the press device 51 is again constructed such that it includes a roll in the form of a press roll 5 or 26 according to the first embodiment or the second embodiment, which together with a mating roll 52 forms a fourth press nip 53 .
  • FIG. 4 thus describes a Duo Nipcoflex press arrangement with a downstream fourth press nip.
  • the rolls 3 and 52 can be constructed as solid cover rolls or shoe press rolls.
  • the first roll 2 and a roll of the second press device are identically constructed as suction press rolls in order to minimize stocks.
US12/123,810 2007-05-25 2008-05-20 Shoe suction press roll Abandoned US20090126892A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007024508.6 2007-05-25
DE102007024508A DE102007024508A1 (de) 2007-05-25 2007-05-25 Schuhsaugpresswalze

Publications (1)

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US20090126892A1 true US20090126892A1 (en) 2009-05-21

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Application Number Title Priority Date Filing Date
US12/123,810 Abandoned US20090126892A1 (en) 2007-05-25 2008-05-20 Shoe suction press roll

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US (1) US20090126892A1 (de)
EP (1) EP1995378A3 (de)
DE (1) DE102007024508A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112424421A (zh) * 2018-08-09 2021-02-26 福伊特专利有限公司 压榨装置

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018119383A1 (de) * 2018-08-09 2020-02-13 Voith Patent Gmbh Maschine und Verfahren zur Herstellung einer Wellpappenrohpapierbahn
CN110815839A (zh) * 2019-10-12 2020-02-21 镇江现代包装有限公司 一种食品包装膜生产专用复合设备

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4608125A (en) * 1984-11-29 1986-08-26 Valmet Oy Frame construction in a paper machine press section for facilitating replacement of press rolls and fabrics
US5593547A (en) * 1994-01-28 1997-01-14 Voith Sulzer Papiermaschinen Gmbh Press section of a paper machine
US6200427B1 (en) * 1996-08-22 2001-03-13 Gerhard Kotitschke Suction roll for the formation or treatment of a material web, such as in particular a paper, card or textile web
US6616810B1 (en) * 1999-11-17 2003-09-09 Andritz Ag Device for removing water from a fibrous material strip

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19724911A1 (de) * 1997-06-12 1998-12-17 Voith Sulzer Papiermasch Gmbh Preßeinheit
DE10022353A1 (de) 2000-05-08 2001-11-15 Voith Paper Patent Gmbh Saugpresswalze
DE10239906A1 (de) * 2002-08-30 2004-03-18 Voith Paper Patent Gmbh Naßpressenanordnung
AT412218B (de) * 2002-10-17 2004-11-25 Andritz Ag Maschf Presswalze
US6884323B2 (en) 2003-01-31 2005-04-26 Voith Paper Patent Gmbh Vented main roll for press assembly in a paper machine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4608125A (en) * 1984-11-29 1986-08-26 Valmet Oy Frame construction in a paper machine press section for facilitating replacement of press rolls and fabrics
US5593547A (en) * 1994-01-28 1997-01-14 Voith Sulzer Papiermaschinen Gmbh Press section of a paper machine
US6200427B1 (en) * 1996-08-22 2001-03-13 Gerhard Kotitschke Suction roll for the formation or treatment of a material web, such as in particular a paper, card or textile web
US6616810B1 (en) * 1999-11-17 2003-09-09 Andritz Ag Device for removing water from a fibrous material strip

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112424421A (zh) * 2018-08-09 2021-02-26 福伊特专利有限公司 压榨装置

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Publication number Publication date
EP1995378A3 (de) 2010-01-13
EP1995378A2 (de) 2008-11-26
DE102007024508A1 (de) 2008-11-27

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Owner name: VOITH PATENT GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:JANZER, JOSEF;REEL/FRAME:021041/0187

Effective date: 20080601

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION