CA1203214A - Electro-pneumatic control system for valve bag filling apparatus - Google Patents

Abstract

ABSTRACT OF THE DISCLOSURE

A control system for use in a valve bay filling apparatus eliminates sifting of product during the filling process. A filling nozzle is inserted into the valve of a bag to be filled. A flow of particulate material a 1 i s provided through the filling nozzle and into the bag. When the bag is full, the flow of particulate material is terminated. A blast of high pressure air is then introduced into the nozzle in order to clear the nozzle of any residual particulate material therein. A low pressure blast of air is introduced between the nozzle and the filling valve to suspend any particles present in the filling valve after the nozzle has been cleared by the high pressure blast. A vacuum is introduced into the nozzle to suck any suspended particles out of the filling valve after the low pressure blast has been introduced An inflatable boot 14 can be provided on the nozzle to seal the nozzle within the valve of the bag during filling. control of the system is effected by electro-pneumatic components.

Description

~2032~4 E~ECTRO PNEUM~TIC CO~TRVL SYSTEM
FO~ VAL~JE BAÇ; FII,LING APPARATlJS

E~ACKl;iROU~D O~ THE INV~NTION

The present invPntlon relates to the f illing S of valve bags with particulate ma~eri~l and, more par~icularly, to a method and system for control1ing ~ novel filling nozzle which eliminate~ the si~ting of produ~ from the valve bag during and ~fter the bag filling operation, Particulate materials are commonly pa~kaged i~
bags that are made from multiple layer6 of p~per and h~ve a "valve" in one upper corner. The valve provides an opening through which the material is dispen~ed during the bag f~lling opecation. ~he valve ~ag i~
typically filled by insertin~ a spou~ or nozzle into the valve and caus~ ns material to flow through the nozzle into the bag. Wh~n ~he bag i5 full, the flow of material is halted and the nozzle is wit~drawn from the valve ~sually ~y Tnoving the bag away from 20 the nozzle. The val~e is sealed to pre~ent egress of the material from the bag during shipping and hand 1 i ng .

~2032~4 The control system of the present invention is particularly suited for use in conjunction with the filler sleeve disclosed in U. S. Patent No.
4,387,749, issued June 14, 1983, Frederick A. Donisi.
The filler sleeve comprises an elongated tubular member which is connec-ted to the top end of the bag.
The tubular member includes an open end which is con-tiguous with a filler opening provided in the top end of the bag. The opposed end of the tubular member is closed, e.g. by heat sealing or folding. A longitudin-ally extending slit is provided in the tubular member disposed on the bottom surface thereof. In use, when the bag is filled by introducing the product by air flow or by gravity through a filler nozzle which is inserted into the filler opening and into the tubular member, the product is deflected downwardly into the bag thereby inhibiting the likelihood of blow-out of the side panels. Preferably, the tubular member is formed from a stretchable material such as poly-ethylene, so that during the filling of the bag theflow of the product stretches the material. By this arrangement, when the filling is completed, and the bag is inverted, the side edges of the slit, which have been stretched, overlap and the weight of the product functions to maintain the overlapping relation-ship thereby preventing the unwanted escape of product from the bag.

- 2 -~2032~4 While the filling nozzle of the present invention i~ particularly suited for use with the slitted filler sleeve ~isclosed in the afore~entioned co-pending app1ication, those skilled in the art ~ill appreciate that the present filling nozzle is also adaptable ~oe use in con~entional valve bags.
In filling valYe bags, problems have been en¢ountered in reducing or elimi~a~ing the sifting and dustin~ problems which o~cux. Typically, some amo~nt of produc~ will spill from the f illin~ nozzle on its way into the bag or on lts withdraw from the bag. Variou~ h~zardous products, such as toxic chemicals, c~ay, limestone, cement, c~rbon black, h~rbicides, fungi~ides, and the like are usually lS packaged in valve ~ags ~nd the elimination of product sifting and dus~ing pcoblem~ durin~ the filling oper~ion is therefore imperative. The slit~ed sleeve enhan~es ba~ performan~e and effe~tively reduces dustlng, ~ut does ~ot ~ompletely eliminate the problem. ~urther, ~ifting can occur after the filling process is comple.ted, e.g. during transit, if material is entrap~ed in the valve durin~ the filling proces~, Such entrapment of material can occur if the filllng n~zzle does not dire~tly discharge produc~ thro~gh the slitted sleeve. ~aterial can also ~ecome entrapped if product dribbles out of the nozzle into the sleeve at the end of the f illing ~ycle.

-3-~2(:~32~

It would be advantageous to provide an apparatus for fi}llng a valve bag which dire~ts the flow of produ~t downwardly into the ~ag, thereby avoiding the direct discharge of produ~t into the back end of the v21ve bag sleeve. It would be further advantageo~s if the apparatu5 and method in~luded a purge system to ~lear the filling nozzl~ of all produ~t after a bag has been fill~d, to subs~antially reduce produçt dribb~e out of the no~le, ~nd ~o clear any pro~uct from ~he valve sleeve which remains after the ba~
ha~ been filled.
~his invention relates to suçh an apparatus.

-4-- ~032~4 ~3U~l~lA R~ _OF THE I l`~VENT I ON

,~n electro-p~eumatic system for controll ing the operation of a valve bag ~ill ing nozzle is provided.
The system cornpr ises a programmahle ccntroller having

5 a plurality of output A supply air manifold, mean~ ~or coupling the manifold to a ~igh pxessure source of air, and pressu~e regul~ting means coupled to the manifol~ for providing a~ lea~t one source of red~ced pressure ai~ are include~. A firs~ solenoid ~ctuated v~lve means coupled to the supply air mAnifold is ad~pted to be actuated by one output of the programmable controller fvr providing a ti~ed high pressure blas~
of ai~ for introduction into the filling noz~le a~ter a valve bag has been filled. A second solenoid-actuated valve me~ns i~ coupled to the pressurerey~l3t~ng mean~ and ~dapted to be ~ctuated by another of the progr~mmable controller outputs for providing a low pressure blast ~f air ~or introduction ex~ernally of the f ill in~ nozzle after the actu~tion of the 20 f irst soleno~d actua~ed ~ralve. A third solenoid actuated valve means is coupled to ~he s~pply air . manifold and adapted to be actuated by an out~ut of the programm~ble controlle for p~o~id$ng a v~cuum for int~oduction into the filling nozzle after the 25 actuation of the second solenoid actuated valve.

The v~cuum provided by the actuation o~ the third solenoid actuated valve can be created by a ventur i . A Ya~uum valve c~an be connected in ser ie between the venturi and the filling nozzle, A fourth 5 solenoid act~ated valve mean~ can be controlled by the proyramma~le ~ontroller. to open the vacuum ~alve a~ter ~he third solenoid actuated valve Treans causes th~ ~enturi to st~rt produ::ing a v2cuun~.
The provision of an electro-pneumati~ system 10 to con~rol the v~l~e bag ill in~ nozzle provides a reliable, easily programmed and economical ~pparatus for filling valve bags~ ~he syste~ elil~inates the sifting o~ produ~t from the valve bag during and after the ~ag filling operation by ~learing the 15 filling no2zle of any loo~e produ~t aft~r the b~g has been fill~d, and by clearing the filling valve in the bag of extraneou~ product at the completion of the bag f ill ing cycle, 120;~ 4 B~IEF DESCRIPTION OF T~E DRAWINGS

Figure ~ is a top plan ~iew, with partial cut-awayr showing a filling nozzle s~itable for use with the con~rol syste~ of the p~esent inventio~S
S ~igure 2 is a side plan view, with partial cut-away, of the nozzle shown in Figure l;
Fig~re 3 is a cross-sectiona~ vie~ taken substantially along the line 3-3 sho~n in Fi~ure 2 ~ig~re 4 is a cross-sectional view taken su~stantially alonq the lin~ 4-4 shown in Figure 2;
Figure S is a cross-sectional ~iew sho~ing the noz21e fillin~ a valve b~ thro~gh a s~itted valve sleeve; and ~ig~re 6 is a ~lock diagram of a ~ontrol sys~em lS apparat~s in accordance with the present invention.

32~4 DETAILED DESCRIPTION OF THE INVENT~ON
The overall structure of a Eillin~ nozzle which can be used in conjunction with the filling sys~em of the p~esent in~ention is shown in ~igures 1 ~nd 2. The nozzle 10 in~ludes an elo~ate~ tube which is hollow to provide a material passage lS
~hereth~ough. In filling a valve baS, ~he nozzle is inse~ted into the bag ~s ~ho~7n in Fi5ure 5. Product flow~ into end 16 of the nozzle th~ough prcduct supply conduit 58. The product, which is typical~y a particulate material, ~merges from the nozzle through opening 12, The valve baq shown in Fi~ure 5 includes a val~re ~leeve 52 h~vin~ a sli~ 54 therein throu~h ~hi~h particulate material 56 passes, Once p~rticulate ~aterial 5~ has passed thr~ugh 51it 54 it is within the interior of bag S~
~ n ~alve bag ~illing noz~le~ of prior design, the opening ~t which the particulate product eme~ges for filling the bag is not designed to direct the flow of material exiting therefrom through ~ slitted valve sleeve. When suçh prior nozzles are used in conjunctiOn with a slitted sleeve, such as sleeve 52 shown in Figure 5, product is forced into the closed end 53 of sleeve 52 ~here it ~n hec~me lodged or otherwise remain af~er th~ filling of the bag has been ~ompleted. P~oduct remaining at end S3 of ~2()32~

v~lve sleeve 52 can later find its way out o~ the valve sleeve, causing the material (wl~ich may be hazardous or toxic~ to exit ~rom the bag. Any su~h leakage of product ~rom the bag is highly undesirable, S Further, nozzles of prior design can c~use the ~losed end 53 of valve sleeve 52 to rupture due to ~he direc~ for~e of material which impa~ts the closed end.
In the filling nozzle shown, opening 12 ls 10 situated so that when ~he nozzle i5 inserted into a slitted ~alve sleeve, the produc~ flowing through the nozzle will be directed through the sli~ and into the bag, thereby minimizing the risk that the produ~ will be caugh~ in the close~ end of the valve sleeve. Th~ design of opening 12, by directing product downwardly, al~o prevents ~he r~pture of the closed end c~f the v~l~te sleeve.
The filling no2~1e also in~ludes various means ~or clearing the nozzle of residual parti~ulate material after the prod~ct flow has ceased, and for removing any parti~ul~te material which ~nay otherwise remain in the valve sleeve afte~ the bag has been fllled. Also provided is means for sealing the no~zle ~ithin the valve ~leeve of a bag dur ing the fillin~ operatio~.
~ he sealinq of the nozzle within a valve sleeve i~ acçomplished by an inflatable rubber boot 14.
Rubbe~ boot 14 is infl~ted by a pressur ized fluid, _ g _ ~2~)3Z~

for example, pxessurized ai~, whi~h is introduced to the boot through a condui~ 34A Conduit 34 is most clearly shown in F~ures 2 and 3, and is connected to a hose 38 by couplin~ 36~ Hose 38 is fed by a timed source of pressurized ~ir which is caused by suitable control means ~discussed hereinbelow) to inflate ru~er boo`t 14 just ~fter the nozzle is inserted into an emp~y valve ba~, and to deflate rubber boot 14 ~ust pr ior to the removal of the filled bag ~om the nozzle. The pressure used to inflate boot 14 wLll typically be on the order of 3 to 5 pounds per square in~h.
After ~ bag has been filled with product flowins t~rough the nozzle, and prior ~o the removal of the lS filled bag from ~he nozzle, a blast Of high pressure air iS int~oduced into material passage 15 of the nozzle to clear the no~zle of any partic~late materi~l remaining therein. The blast of high pressure air is passed thrDugh hose 46 to ~onduit 42. Hose 46 is 20 coupled to conduit 42 by coupling 44. In the oper~tion of the filling ~pout, the blas~ of high pressure air will typically be ~t a pressure on the ~rde~ of 100 pounds pe~ squ ar e i nch .
7~f ter the high pressure bla~t clears mater ial 25 passage 15 of ~ny remaininy produ~t, low pressure ai~ at a pressure on the order of 5~ pounds per square inch ~s introduced between the nozzle and the valve sleeve at ports 20, The ~ow pressure air is carried to ports 20 by ~onduit~ 18. Conduits ~8 ~re ~2032~4 coupled, ~hrou~h coupling~ ~2, to hoses 23 which carry the low p~essure air. The term "l~w pressure"
is used in des~ribinq thiq air source simply to differentiate it from the hi~h pressure burst of air 5 whic~ is introduced into material passage 15 by conduit 42 and is u~ed to clear m~terial passage 1 of extraneou~ par~iculate material aE~er a ~ag has been f illed .
The purpose of providin~ ~ burst of low pressure 10 air between the nozzle and ~he ~alve sleeve into whi~h the noz~le is inserted is to suspend any particula~e product mater ial remairlinq in the ba9 sleeve af ter the ba~ has been filled. ~ny such particl~s ~emaining in the v~lve sleeve a~te~ the bag has been filled 15 are referred ~0 as l'dribblings". After the dribblin~s have been su~pen~ed, a vacuum is drawn through cond~it 40. Conduit 40 ~ommunicates with material passasge 15. The vacuum ls d~awn as the nozzl~ is being removed from the ~a~, and as a result any suspended dribblings are sucked into material passage ~5, and through conduit 40 to ~ffect their removal from the bag. When the nozzle is used ~n conjunctiOn with a slitted valve sleeve, as shown in Figure 5, the in~ernal pressure of the aerated product in the~
25 filled bag forces the ~lit to close~ thereby preventing the vacuum within material passage 15 from sucking ~ny product (other than dribbling5) out of the illed bag. Thus, slit 54 can be analogized to a one way - lZ032~14 valve, which allows product to enter, but not exit rom the b~g. Figure 4 ~learl~ shows the nozzle opening 1~. and por~s 20 whi~h supply the low pressure air externally of nozzle 10~
S In order to efect pro~er ti~ing of the vacuum whi~h is drawn ~rou~h c~nduit 40, a vacu~m valve ~4 is provided. V~cuum valve 24 is controlled by a vac~um pilot line 2~, ~oupled to valve 24 at port - 32. A por~ 33 can optionally be provided for pressure relief or to close the valve, depending on the type of ~alve which is ~sed for vacuum valve 2~. A ho~e 26 is shown connected to optional port 33. A vacuum sour~e is conn~ted at end 30 of çonduit 40 through ~ ~oupling 31. The vacuum source can be turned on 1~ prior to the time at which it is desi~ed to draw a va~uu~ thr~ugh conduit ~0, to enable the vacuum to re~h i~s full operating cap~ci~y. Then, when it is desired to draw the va~uum through conduit 40, pressu~i~ed air is introduce~ into port 32 from vacuum pilot ~0 line 2~ to cause valve 24 to open. When it is desired to terminate the vacuum in conduit 40, vacuum pilot line 28 ~h~s valve 24 of~. The vacu~m source attached at end 30 of condult 40 can comprise a venturl o~r any other well known va~u~m source.
Figure 6 i8 a blo~k diagram of the control system 150 of the present inven~ion. The control system shown in ~igure 6 is connected to a nozzle of the type shown in Figure5 1 through 5.

~12-I

- ~203Z~14 A process controller 65 includes a pro~rammable controller which is conne~ted to a supply voltage through terminals 62 and 64. An on/off switch 66 iS
provided a!or~g with.a lamp 6~ to indicate that power S is being supplied to programmable controller 60. An electro-pneumatic ~ontrol unit 95 is driven by process controller 65. Electro pneumatic control unit 95 provides the ~tariou~ air pressures which ~re used ~ n the operation of spoU~ tfillins nozzle) 1~.
lG In filling a v~lve bag ~n accordance with the present i~vention, rubber boot 14 on spout 10 is inflated after the spout has been inserted into the valve of a valve ~ag. In order to initia~e the bag filling sequence~ an vperator presses start button 15 70 on programn~able contro~ler 60 . Programmabl e controller 60 has a plurali~ 4f outputs 72, 7~, 76, ~nd 78~ A~ter a val~e ~g i~ placed on spout 10, ~nd s~art buttorl 70 is pressed, output 72 is energlzed to inflate boot ~4. A la~np ~0 is conne~ted in series 20 ~ith outpu~ 72 to indi~ate that the signal for inflating boo~ 14 is present. Outpu~ 72 i~ ~onnected from process controller 65 to elec~ro-pneumati~ control unit 9S, ~here it is connected to a air pilot solenoid valve 98. Output 72 cause~ valve g8 to open, allowing 25 low pressure air to pass th~ough hose 38 and coupling 36 on spout 10, thereby inflating boot 14 ~ Pr ior ~o ~emo~al o~ the f ill ing nozzle or spo~t 10 from the filled valve bag, output 7~ of programmable con~roller 60 turns off, turning off valve 98 and thereby defl~tin:~
30 boot 14.

~120321~

Air is ~upplied to valve 9~ from pressure regulator 108. Pressure re~ulator 108 is supplied with high pres~ure aLr from high pressure air supply line 110. Typically, the hi~h pressure air supply S will be at a pres~ure of about 100 pounds per s~uare inch. Low volume pressure regulator 96 further regulates the ~ir whi~h inflates boot 14, to ins~re that the boot does not rupture durihg infl~tion.
The pressure actu~lly ~pplied to rubber boot 14 is on the order of 3 to 5 pounds per squ~re inch.
~fter b~ot 1~ i~ inflated to effect a seal between the spout 10 and the valve bag into which it is inserted, programmable contr~lle~ ~0 will wait until the valve bag is filled with a product flowing through ~he spout from supply conduit 58. After the ba~ is filled, output 7~ from programma~le controller~
60 wi.1 be~ome ene~gized, thereby t~rning on ~
pilot so~enoid valve lOC. When valve 100 tu~ns on, a h~gh press~e bla~t of air will be transmitted by hose 46 and through coupling ~4 in spout 10 to clea~
material passage 15 of any produ~t rem~ini~g therein after the product fl~w through conduit sa has ceased.
Sol~noid valve 100 re~eives high pressure air dire~tly rom high pr~58ure air supply line ~
A 1~P ~2 i3 provided in series ~ith outp~t 74 of pro~ramm~ble controller 60 to indicate th~t the output is energized. After the high pressure blast of air has been provided, outpu~ 7q ~urns off a~d a low pressure air purge is effected by output.76 of ~203Zl~

programmable controller ~0. Output 76 has lamp 84 connected in series therewith to indicate ~hen the output is energized, This outpu~ is c~nnected from p~ocess controller 65 to a low pressure purge valve 104 in ele~tro-p~eumatic control unit 95. Valve 104 is an air pilot solenoid valve which reoeives a low pressure ai~ supply from pressure regul~tor 10~.
~en valve 104 is actuated ~y output 76 o~ programmable controller 60, a low pressure ~las~ of air travels th~ough hose 23, through coupling 22 and cond~it 18 in spout 10 ~here it exit~ ~hrough po~s 20. This low pressure blast suspends any dribblin~s le~t in the valve of the bag ~ft-er the spout has been cleared by the high pressure purge f rom valve 100 .
Output 7~ o~ programmable con~roller 60, which 15 intiateS the hig~ pre~sure p~rge from ~alve 100, has a delay relay 88 connected thereto. Output ~9 of delay relay 88 has ~ lamp ~0 connected in series the~e~ith to . indicat~ when ~he delay relay output 8 is energized. The energi~ation of output 89 actuate~
~ ven~uri solenoid valve 102 in electro-pneumatic control unit 9S. venturi ~alve 102, when act~ated, introduces air at hi~h pressure inta hose 131. Hose 131 is coupled to ven~uri 132 to produce a vacu~ ~t the output ~hereof. The ou~put of ventlJri 132 is connected by ho5e 133 to ~oupling 30 on valve 24.
When valve 24 is Off, no vacuum is introduced into material p~ssage 15 of spout 10 through conduit 40.

~Z03~4 Delay rel~y B8 actu~tes venturi ~talve 102 a predetermined ~ilne after butput 74, and hence high pressure purge valve 100, has been energized. The predetermined time period e~pire~ before output 78 S of programmable controller 60 becomes energized.
The purpo~e of this is to enahle ventur i 132 to produce its m~ximum v~cuum before valve ~4 is opened, Thus, once ~ralve 24 opens, the full vacuum from venturi 1~2 i~ int~odu~ed to material passasge 15 ln 10 spc~u~ 10 . ~hose Si~ ed ~ n the art will appreciate that the use of del~y relay 88 enables the present control syste~ to operate u~ing a progr~mmabl~ controller with only ~o~r outputs. If a progra~mable ~ontroller with f ive outp~t~ we~e av~ilabl~, output line 89 which actUateS venturl valve 102 could be ~onnected ~i~ectly to one of the five outputs, thereby o~viat~ng the need for delay ~elay 88.
After the o~curance of the high pressure purge and low pressure p~r~e, and d~rin~ She prod~ction of ~ a va~uu~ by vent~ri 132, output 78 of programmable controller ~0 is energized to a~t'late vacuum pilot ~olenoid valve 1~6 in electro-pneumatic ~ontrol un~t 95, A lamp ~ ~s provide~ in series with output 78 to indicate when thiC output is energized. Vacu~urn 25 pLlot valve 106 is fed by high pressure air supply linc 110 and when ac~uated, introduces air unde~
high pressure t} rough hose 28 to v~cuu~n valve 24.

- ~203~4 When high pressure air ~s introduced into valve 24, the valve ope~s an~ applies the vacu~m produced by venturi 132 ~v mat~r i~l p~ss~gc lS . In this manner, any drib~lings which ~ave been suspende~ in the bag valve by the low pressure pur~e are removed therefrom by suction. Spout 10 is then withd~awn from the ~illed valve bag and a reset si~nal is applied to programm~ble controller 60 throu~h reset line g~, indicating that ~he b~g filling cycle has been completed.
The reset signal can, fo~ example, be generated by a mic~oswitch arrangement loca~ed at the bag filli~g station. Once programmable controller ~0 ha~ been rese~, it is ready for the next bag ~illing cycle~
Programm~le controllers, such as programmable controller 60 shown in Figure 6, are well known in the art. One such unit is the Micromaster WP6000 prog~ammable controller. Those skilled i~ the art wi~1 appreciate that other prog~ammable cont~ollers can be readily ad~pted for use in the Cbntrol sys~em of the present invention.
Ea~h of air pilot so~enoid valves 98, 100, 02, 104, and 106 ca~ be explo~ion proof valves~ or alternatively can be regular valves moun~ed in an explosion proof box. The use of an explosion p~oof appara~us provides safety for the operat~rs of the bag filling machiner~. Su~h solenoid vaives typically include solenoids which, when açtuated ~y an electric signal, cause a valve coupled thereto to open or close. Thus, such air pilot solenoid valves are easi~y controlled by the electricai outputs of a programmable con~roller such as controller 60 depicted in Figure 6.

Claims (5)

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. An electro-pneumatic system for controlling the filling of a valve bag with particulate material, said bag including a generally tubular filling valve, said system being for use with a filling nozzle dimensioned to fit in the filling valve, said system comprising:
a programmable controller having a plurality of outputs;
a supply air manifold;
means for coupling said manifold to a high pressure source of air;
pressure regulating means coupled to said supply air manifold for providing at least one source of reduced pressure air;
a first solenoid actuated valve means coupled to said supply air manifold and adapted to be sequentially opened and closed by one output of said programmable controller for providing a timed high pressure blast of air for introduction into the filling nozzle after the valve bag has been filled to clear remaining particulate material from the nozzle;
a second solenoid actuated valve means coupled to said pressure regulating means and adapted to be sequentially opened and closed by another of said program-mable controller outputs for providing a low pressure blast of air for introduction into the filling valve externally of the filling nozzle after the closing of said first solenoid actuated valve means to suspend any of said particulate material in said filling valve; and a third solenoid actuated valve means coupled to said supply air manifold and adapted to be sequentially opened and closed by another output of said programmable controller for providing a vacuum for introduction into the filling nozzle after the closing of said second solenoid actuated valve means, said vacuum removing the suspended particulate material from the filling valve as the nozzle is withdrawn therefrom.

2. The control system of claim 1 wherein said vacuum is created by a venturi and said third solenoid actuated valve means controls the input of high pressure air from said manifold to the venturi,

3. The control system of claim 2 further comprising:
a vacuum valve adapted for series connection between said venturi and the filling nozzle; and a fourth solenoid actuated valve means coupled to said supply air manifold and adapted to be actuated by an output of said programmable controller for opening said vacuum valve after the actuation of said third solenoid actuated valve means.

4. The control system of claim 3 further comprising a fifth solenoid actuated valve means coupled to said pressure regulating means and adapted to be actuated by another of said programmable controller outputs prior to the filling of a valve bag for providing pressurized air to inflate a boot surrounding a portion of said nozzle.

5. The Control system of claim 4 further comprising means for resetting said programmable controller after the completion of bag filling cycle.