EP1634993A1

EP1634993A1 - Automatic roll-change system for use in the production of corrugated cardboard

Info

Publication number: EP1634993A1
Application number: EP04729905A
Authority: EP
Inventors: Joaquim Vila Capdevila; Ting-Feng Yu
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-04-30
Filing date: 2004-04-28
Publication date: 2006-03-15
Anticipated expiration: 2024-04-28
Also published as: ES2253019B1; ES2253019A1; DE602004012407D1; EP1634993B1; ATE389059T1; WO2004097108A1; ES2303070T3

Abstract

A system for automatically switching webs in the manufacture of corrugated board.

Corrugated board is manufactured with corrugators comprising several machines in line comprising among others the double gluing unit and the drying table, the operator manually carrying out between these two the cutting off and/or the splicing of the corrugated medium webs for the production of the corrugated board web.

According to the system of the invention first and second automatic cutting off means and first and second splicing means are arranged between the double gluing unit and the drying machine in order to carry out the cutting off and the splicing of the inner and outer fluted walls, respectively, said system comprising control means for automatically carrying out said cutting off and splicing operations.

Description

OBJECT OF THE INVENTION

The present invention has as its object a system for automatically switching webs in the manufacture of corrugated board, said system allowing to in a flexible and versatile manner and with no interruptions switch webs in the production of single- or multi-fluted corrugated board.

FIELD OF THE INVENTION

The basic corrugated board manufacturing process is based on the corrugation of a paper medium web thus creating what is known as a fluted medium or fluting. This fluted medium is thereupon adhered to two paper medium webs at both tips of the fluted medium profile. This gluing of the paper medium webs creates a band of three paper medium webs having a thickness being equivalent to the flute profile having been used with the medium having been put through the corrugation process. The basic corrugated board does hence consist of three paper medium webs whose number can be increased up to five, seven or nine as per the increase of the number of flutings, this latter being achieved by gluing the paper medium webs to each other. The corrugated board production line is called a corrugator and comprises a number of machines being installed in line and being fit to carry out several functions.
In corrugated board there is at present a number of different flute profiles, these latter being also called flutings, the most common flute profiles being those identified as N, M, O, E, F, B, C and A flutes.
Each flute profile or fluting has a different flute height, the corrugated board being manufactured hence having a different final thickness depending on each fluting and on the paper medium webs having been used.
The corrugated board can be manufactured by using combinations of one only fluted wall, the board being in this case called single wall; of two fluted walls, the board being in this case called a double-double face or double wall; of three fluted walls, the board being in this case called triple wall; and even of four fluted walls, the board being in this case called quadruple wall.
One corrugated medium being glued at only one of its faces to a flat medium thus forming a web of two media being glued together is what is called a single face web. This latter will thus be a single face web of the E, B, C, A, N, M, O, F, etc. flute type according to the flute profile being used for manufacturing a single face web. The term "fluted wall" or "single face web", or rather "fluted wall/single face web", will be indifferently used hereafter to indicate the medium web having to be cut off or threaded up by the system.
Cutting off and splicing examples for the manufacture of corrugated board:

B to BC standing for the splicing to switch from single fluted wall of the B flute type to double fluted wall of the BC flute type.
C to BC standing for the splicing to switch from single fluted wall of the C flute type to double fluted wall of the BC flute type.
C to B standing for the splicing to switch from single fluted wall of the C flute type to single fluted wall of the B flute type.
EBC to BC standing for the splicing to switch from triple fluted wall of the EBC flute type to double fluted wall of the BC flute type.
BC to EBC standing for the splicing to switch from double fluted wall of the BC flute type to triple fluted wall of the EBC flute type.

The corrugator is at present a production line comprising several machines being installed in line. The different functions of these machines allow to have at the end of the production line the manufactured board in form of stacked slabs of different dimensions according to the type of board box to be later on manufactured.
The whole of the machines making up a corrugator is basically divided into two ends: the wet end and the dry end. The wet end comprises the machines being needed for corrugating the paper medium webs and for gluing them. The dry end comprises the machines being needed for transforming the corrugated board web having been manufactured into board slabs of different dimensions.
The wet end consists of the following machines:

Roll stand or uncoiler, splicing unit, corrugating body, preheater, bridge, double gluing unit and drying table.

The dry end consists of:

Auxiliary cutter, slitter-scorer, transversal cutter and stacker.

In the corrugators there is at present a situation in the process which brings about a stoppage of the production and of the continuous operation of the production line.
There are nevertheless a number of drawbacks with the known corrugators. Thus when because of the production needs the production line has to change the type of corrugated board web, i.e. when it becomes necessary to change the combination of single face webs at the entry of the table, the corrugator has to be stopped. The change of single face web to be used in the production is carried out between the double gluing unit and the drying table. In one case the change of single face web of the board being manufactured is carried out by adding another single face web or fluted wall to what is being manufactured so far, whereas in other cases the single face web will be completely changed, the one having been used so far in the production being hence cut off in order to thereafter feed into the drying table the new single face web being thereupon desired. When carrying out all these changes the production line or corrugator must be stopped up to zero or practically null speed; the single face web having been so far in production must be cut off, or the new single face web must be threaded up into the table, and the whole line must be restarted till again reaching the normal production speed. In all cases the corresponding single face webs must be cut off or added in order to thus proceed to the manufacture of the new corrugated board.
The stoppage of the corrugator does of course generate a downtime, and it does besides force the operator to get into the machine in order to thus proceed to thread up or cut off the single face web, with the consequent risk being implied by that because of the fact that he machine is not switched off. The corrugator could by mistake start running at any time, and there are high temperature areas that can cause serious burns to the operators. The lowering of the corrugator's speed does in its turn generate a lessening of the quality of the board being manufactured since the temperature regime in the production is thus considerably altered. The board waste being generated by the fluted wall changes till reaching the normal working speed is a substantial one.
The system being the object of the present invention obviates the aforementioned drawbacks. Said system is exclusively used in the wet end of the corrugator in order to improve the productivity and enhance its operational safety. The system of the invention is to be installed between the double gluing unit and the drying table. The invention allows to carry out the change of any single face web combination of the corrugator at the production speed and with no need for the operator to enter the machine, and said changes can be carried out in an automatic manner or else manually under the control of the operator being in charge of the line. Said system is fit to cut off and splice any type of single face web regardless of its flute size.
The system for automatically switching fluted walls in the manufacture of corrugated board which is the object of the present invention is essentially characterised in that between the double gluing unit and the drying table of the corrugator's wet end it comprises first automatic cutting off means for carrying out the cutting off of the outer/upper fluted wall/single face web and second automatic cutting off means for carrying out the cutting off of at least one inner/intermediary fluted wall/single face web, first means for automatically splicing the outer/upper fluted wall/single face web and second means for automatically splicing at least one inner/intermediary fluted wall/single face web, and control means for automatically carrying out the cutting off and splicing of the outer/upper fluted wall/single face web and/or of at least one of the inner/intermediary fluted walls/single face webs of the resulting multi-fluted corrugated board web, this latter being completed with the conventional lower face liner web, the aforementioned means thus allowing to carry out said changes in a versatile manner and in a continuous mode.
According to the invention the first automatic cutting off means for carrying out the cutting off of the outer/upper fluted wall/single face web do basically comprise a cut-off knife acting as a by way of guillotine spanning the width of the machine and acting on an anvil spanning the whole width of the machine, the first splicing means comprising compressed air means being provided for pushing the cut free end of the outer/upper fluted wall/single face web towards the apron of the upper conveyor of the downstream drying table in order to thus carry out the splicing with the adjacent inner/intermediary fluted wall/single face web by means of the glue being applied on the fluting of said outer/upper fluted wall.
According to the present invention, in combination with the first cutting off means and the first means for splicing the outer/upper fluted wall/single face web the system of the invention comprises means for suspending said outer/upper fluted wall/single face web when this latter has been cut off while waiting for the splicing with the corresponding inner/intermediary fluted wall/single face web to be carried out at the corresponding point in time.
The invention comprises a tube being arranged in a transversal arrangement in the machine, said tube being provided with drilled holes through which the compressed air jets are expelled in order to thus carry out the corresponding splicing operation.
According to the invention the second means for automatically cutting off at least one inner/intermediary fluted wall/single face web do basically comprise a rotary cut-off knife spanning the width of the machine, the second splicing means comprising compressed air means being provided for pushing the cut free end of the inner/intermediary fluted wall/single face web towards the space between the upper conveyor and the drum being provided for driving the conventional lower face liner web immediately upstream of the drying table, in order to thus carry out the splicing of said inner/intermediary fluted wall/single face web with the outer/upper fluted wall/single face web by means of glue and in the manner having been described above, and with said lower face liner web by means of the glue being applied on said inner/intermediary fluted wall/single face web, i.e. on the fluting being adjacent to said lower face liner web.
According to the present invention, in combination with the second cutting off means and the second inner/intermediary fluted wall/single face web splicing means the system of the invention comprises means for suspending the inner/intermediary fluted wall/single face web when this latter has been cut off while waiting for the splicing with the corresponding outer/upper fluted wall/single face web and with the lower face liner web to be carried out at the corresponding point in time.
The splicing means consist in a tube being arranged in a transversal arrangement in the machine, said tube being provided with drilled holes through which the compressed air jets are expelled in order to thus carry out the corresponding splicing operation.
The control means of the invention consist in a control panel comprising indicators, buttons and selector switches, said controls namely being a power on indictor, an intermittent indicator light, a hand-operated control for manually cutting off the inner fluted wall/single face web, a hand-operated control for manually cutting off the upper fluted wall/single face web, an open/closed circuit indicator, a hand-operated control for manually splicing the upper fluted wall/single face web, a hand-operated control for manually splicing the inner fluted wall/single face web, a control for activating the automatic execution of the web switching operations, a selector switch for manual operation, a display for showing the present combination of fluted walls, a display for showing the next combination of fluted walls, a selector switch for interfacing with the control computer, a selector switch for interfacing with the inner fluted wall/single face web splicing unit, and a selector switch for interfacing with the upper fluted wall/single face web splicing unit.
The system of the invention comprises threading up means, crossed photocells and means for braking the fluted wall/single face web in the bridge.
The system of the invention allows to switch fluted walls at will and in all manners of choice.
The system is in a position to basically carry out two operations: the threading up of the fluted wall/single face web within the drying table, and the cutting off of the single face web.
In the case of two fluted walls/single face webs said operations consist in anyhow switching from single fluted wall as the inner fluted wall/single face web to double fluted wall by threading up the upper fluted wall/single face web; from single fluted wall as the upper fluted wall/single face web to double fluted wall by threading up the inner fluted wall/single face web; from double fluted wall to single fluted wall as the inner fluted wall/single face web; and from double fluted wall to single fluted wall as the upper fluted wall/single face web.
The system of the invention allows to keep the fluted wall in storage in the conventional storage means of the corrugator till again threading it up.
These and other features will be best made apparent by the following detailed description whose understanding will be made easier by the accompanying three sheets of drawings showing a practical embodiment being cited only by way of example and hence not limiting the scope of the present invention.

DESCRIPTION OF THE DRAWINGS

In said drawings:

Fig. 1 illustrates the system of the invention for automatically switching webs in the manufacture of corrugated board, the case being shown here corresponding to a corrugated board comprising two webs or fluted walls namely being the outer/upper one and the inner/intermediary one, and the conventional lower face liner web, at the point in time when the cutting off and the ulterior splicing of the outer/upper fluted wall are being carried out.
Fig. 2 is a view like that of Fig. 1 in this case showing the cutting off and ulterior splicing of the inner/intermediary fluted wall.
Fig. 3 is a front view illustrating the control means comprising a control panel for automatically switching webs or fluted walls in the formation of corrugated board as per an exemplary embodiment.

DETAILED DESCRIPTION OF THE EMBODIMENT

According to the drawings the system for automatically switching webs in the manufacture of corrugated board as per the invention is applicable to the conventional corrugators (not shown) being used in the manufacture of corrugated board, each of said corrugators comprising several machines being installed in line, said corrugator being basically divided into a wet end and a dry end, said wet end comprising the roll stand or uncoiler, the splicing unit, the corrugating body, the preheater, the bridge, the double gluing unit and the drying table, and said dry end comprising the auxiliary cutter, the slitter-scorer, the transversal cutter and the stacker, said corrugator being operated for manually carrying out the cutting off and/or splicing of corrugated medium webs between the double gluing unit and the drying table of the wet end during the production of the single- or multi-fluted corrugated board web being cut into slabs at the end of the dry end.
The system of the invention allows to automatically carry out those operations being formerly carried out by the operator with the consequent risk to his or her physical integrity, said operations namely being those involving the cutting off and/or splicing of the corrugated medium webs between the double gluing unit being generally referenced at -DE- in the drawings and the drying table -MS- of the wet end of the corrugator in question.
In order to facilitate the understanding of the invention and for the sake of simplicity of the drawings said Figs. 1 and 2 are fragmentary views illustrating the aforementioned double gluing unit -DE- and drying table - MS- and the space between both of them, and it is in this latter space where in the case of the conventional corrugators not being provided with the system of the present invention the operator in question has to carry out the tasks of cutting off and/or splicing the corrugated medium webs with serious risk to his or her integrity, this working method besides entailing substantial losses both of time and unusable material.
As illustrated in Figs. 1 and 2 of the drawings the system of the present invention between the double gluing unit -DE- and the drying table -MS- of the wet end of the corrugator (not shown) comprises first automatic cutting off means -1- for cutting off the outer/upper fluted wall/single face web -CES- and second automatic cutting off means -2- for cutting off at least one inner/intermediary fluted wall/single face web -CII-, first means -3- for automatically splicing the outer/upper fluted wall/single face web and second means -4- for automatically splicing al least one inner/intermediary fluted wall/single face web, and control means -MC- for automatically cutting off and splicing the outer/upper fluted wall/single face web - CES- and/or at least one of the inner/intermediary fluted walls/single face webs -CII- of the resulting multi-fluted corrugated board web being completed with the conventional lower face liner web -PCI-, said means allowing to carry out said changes in a versatile manner and in a continuous mode.
According to the system of the invention the first means -1- for automatically cutting off the outer/upper fluted wall/single face web -CES- are inactive while said outer/upper fluted wall/single face web -CES- is continuous before being cut off and during the normal corrugated board web manufacturing process, this being what can be called a first stage, said outer/upper fluted wall/single face web being illustrated in solid and thick lines in Figs. 1 and 2. After having been cut off in a second stage mode being illustrated in the drawings in dotted lines said outer/upper fluted wall/single face web goes over to a third "hold" stage while waiting to be spliced again, the outer/upper fluted wall/single face web being in said hold stage illustrated in dash lines, said cutting off means -1- basically comprising a cut-off knife -5- acting by way of guillotine spanning the width of the machine and acting on an anvil spanning the whole width of the machine. The first splicing means in their turn comprise compressed air means -3- being fit to push the cut free end -E- of the outer/upper fluted wall/single face web -CES- towards the apron -6- of the upper conveyor -7- of the drying table -MS-, said fourth splicing stage being illustrated in the drawings in dash-and-dot lines and taking place as the next step being carried out in order to carry out the splicing with the adjacent inner/intermediary fluted wall/single face web - CII- by means of the glue -CO- being applied on the fluting -PO- of said outer/upper fluted wall.
In combination with the first cutting off means -1-and the first splicing means -3- for the splicing of the outer/upper fluted wall/single face web -CES- the system of the invention comprises means -8- for suspending said outer/upper fluted wall/single face web -CES- when this latter has been cut off and is in the "hold" stage while waiting for the splicing with the inner/intermediary fluted wall/single face web -CII- to be carried out at the corresponding point in time.
The aforementioned compressed air means -3- being provided for pushing the cut free end -E- of the outer/upper fluted wall/single face web -CES- comprise a tube being arranged in a transversal arrangement in the machine (not shown in detail), said tube being provided with drilled holes through which the compressed air jets -CH- are expelled in order to carry out the splicing having been described above.
According to the system of the invention the second automatic cutting off means -2- for automatically cutting off at least one inner/intermediary fluted wall/single face web -CII- do basically comprise a rotary cut-off knife -9- spanning the width of the machine. The second splicing means in their turn comprise compressed air means -4- being fit to push the cut free end -E'- of the inner/intermediary fluted wall/single face web -CII-towards the space between the upper conveyor -7- and the drum -10- being provided for driving the conventional lower face liner web -PCI-, said compressed air means being located immediately upstream of the drying table - MS- in order to carry out the splicing of said inner/intermediary fluted wall/single face web -CII- with the outer/upper fluted wall/single face web -CES- by means of glue -CO'- in the manner having been described above and with said lower face liner web by means of the glue being applied on said inner/intermediary fluted wall/single face web -CII- on the fluting -PO'- being adjacent to said lower face liner web -PCI-.
In combination with the second cutting off means -2- and the second splicing means -4- being provided for carrying out the splicing of the inner/intermediary fluted wall/single face web -CII- the system of the invention comprises suspension means -11-, said inner/intermediary fluted wall/single face web having been illustrated in Fig. 2 in solid and thick lines as in Fig. 1 in this sort of first stage, said inner/intermediary fluted wall/single face web once having been cut off and when thus being like in a second stage being illustrated in dotted lines being arranged by means of said suspension means being provided for suspending said inner/intermediary fluted wall/single face web -CII- when this latter has been cut off and is in a by way of third "hold" stage while waiting for the splicing with the corresponding outer/upper fluted wall/single face web -CES- and with the lower face liner web -PCI- to be carried out at the corresponding point in time, said hold stage having been illustrated in dash lines.
Said compressed air means -4- making up the splicing means and being provided for pushing the cut free end - E'- of the fluted wall -CII- towards the machine in a fourth stage being illustrated in dash-and-dot lines consist in a tube being arranged in a transversal arrangement in the machine (not shown in detail), said tube being provided with drilled holes through which the compressed air jets -CH- are expelled in order to thus carry out the corresponding splicing operation.
The control means -MC- of the system of the invention consist in a control panel -15'- for automatically switching webs (or outer/upper and inner/intermediary single face webs), said control panel comprising indicators, buttons and selector switches, said controls namely being a power on indictor -1'-, an intermittent indicator light -2'-, a hand-operated control -3'- for manually cutting off the inner fluted wall/single face web, a hand-operated control -4'- for manually cutting off the upper fluted wall/single face web, an open/closed circuit indicator -5'-, a hand-operated control -6'- for manually splicing the upper fluted wall/single face web, a hand-operated control -7'-for manually splicing the inner fluted wall/single face web, a control -8'- for activating the automatic execution of the web switching operations, a selector switch -9'- for manual operation, a display -10'- for showing the present combination of fluted walls, a display -11'- for showing the next combination of fluted walls, a selector switch -12'- for interfacing with the control computer, a selector switch -13'- for interfacing with the inner fluted wall/single face web splicing unit, and a selector switch -14'- for interfacing with the upper fluted wall/single face web splicing unit.
The system of the invention comprises threading up means, crossed photocells and means for braking the fluted wall/single face web in the bridge (all of said means not having been illustrated in detail). Said system allows to switch fluted walls at will and in all manners of choice. Said system is as well in a position to basically carry out two operations: the threading up of the fluted wall/single face web within the drying table, and the cutting off of the fluted wall/single face web.
In the case of two fluted walls/single face webs said operations consist in anyhow switching from single fluted wall as the inner fluted wall/single face web to double fluted wall by threading up the upper fluted wall/single face web; from single fluted wall as the upper fluted wall/single face web to double fluted wall by threading up the inner fluted wall/single face web; from double fluted wall to single fluted wall as the inner fluted wall/single face web; and from double fluted wall to single fluted wall as the upper fluted wall/single face web.
The system of the invention allows to keep the fluted wall in storage in the conventional storage means of the corrugator till again threading it up.
The invention can within its essentiality be put into practice in other embodiments differing only in detail from the one having been described above only by way of example, said other embodiments also falling within the scope of the protection being sought.

Claims

A system for automatically switching webs in the manufacture of corrugated board by means of a corrugator comprising several machines being installed in line, said corrugator being basically divided into a wet end and a dry end, said wet end comprising the roll stand or uncoiler, the splicing unit, the corrugating body, the preheater, the bridge, the double gluing unit and the drying table, said dry end comprising the auxiliary cutter, the slitter-scorer, the transversal cutter and the stacker, said corrugator being such that it is operated for manually carrying out the cutting off and/or the splicing of corrugated medium webs between the double gluing unit and the drying table of the wet end during the production of the single- or multi-fluted board web being cut into slabs at the end of the wet end; said system being characterised in that between the double gluing unit (DE) and the drying table (MS) of the corrugator's wet end it comprises first automatic cutting off means (1) for carrying out the cutting off of the outer/upper fluted wall/single face web (CES) and second automatic cutting off means (2) for carrying out the cutting off of at least one inner/intermediary fluted wall/single face web (CII), first means (3) for automatically splicing the outer/upper fluted wall/single face web and second means (4) for automatically splicing at least one inner/intermediary fluted wall/single face web, and control means (MC) for automatically carrying out the cutting off and splicing of the outer/upper fluted wall/single face web and/or of at least one of the inner/intermediary fluted walls/single face webs of the resulting multi-fluted corrugated board web, this latter being completed with the conventional lower face liner web (PCI), the aforementioned means thus allowing to carry out said changes in a versatile manner and in a continuous mode.
A system as recited in claim 1, characterised in that the first automatic cutting off means (1) for carrying out the cutting off of the outer/upper fluted wall/single face web (CES) do basically comprise a cut-off knife (5) acting as a by way of guillotine spanning the width of the machine and acting on an anvil spanning the whole width of the machine, and in that the first splicing means comprise compressed air means (3) being provided for pushing the cut free end (E) of the outer/upper fluted wall/single face web (CES) towards the apron (6) of the upper conveyor (7) of the downstream drying table (MS) in order to thus carry out the splicing with the adjacent inner/intermediary fluted wall/single face web (CII) by means of the glue (CO) being applied on the fluting (PO) of said outer/upper fluted wall.
A system as recited in claim 2, characterised in that in combination with the first cutting off means (1) and the first means (3) for splicing the outer/upper fluted wall/single face web (CES) the system of the invention comprises means (8) for suspending said outer/upper fluted wall/single face web (CES) when this latter has been cut off while waiting for the splicing with the corresponding inner/intermediary fluted wall/single face web (CII) to be carried out at the corresponding point in time.
A system as recited in claim 2, characterised in that it comprises a tube being arranged in a transversal arrangement in the machine, said tube being provided with drilled holes through which the compressed air jets (CH) are expelled in order to thus carry out the corresponding splicing operation.
A system as recited in claim 1, characterised in that the second means (2) for automatically cutting off at least one inner/intermediary fluted wall/single face web (CII) do basically comprise a rotary cut-off knife (9) spanning the width of the machine, and in that the second splicing means comprise compressed air means (4) being provided for pushing the cut free end (E') of the inner/intermediary fluted wall/single face web (CII) towards the space between the upper conveyor (7) and the drum (10) being provided for driving the conventional lower face liner web (PCI) immediately upstream of the drying table (MS), in order to thus carry out the splicing of said inner/intermediary fluted wall/single face web (CII) with the outer/upper fluted wall/single face web (CES) by means of glue (CO') and in the manner having been described above, and with said lower face liner web by means of the glue being applied on said inner/intermediary fluted wall/single face web, i.e. on the fluting (PO') being adjacent to said lower face liner web (PCI).
A system as recited in claim 5, characterised in that in combination with the second cutting off means (2) and the second means (4) for splicing the inner/intermediary fluted wall/single face web (CII) the system of the invention comprises means (11) for suspending the inner/intermediary fluted wall/single face web (CII) when this latter has been cut off while waiting for the splicing with the corresponding outer/upper fluted wall/single face web (CES) and with the lower face liner web (PCI) to be carried out at the corresponding point in time.
A system as recited in claim 5, characterised in that the splicing means consist in a tube being arranged in a transversal arrangement in the machine, said tube being provided with drilled holes through which the compressed air jets (CH) are expelled in order to thus carry out the corresponding splicing operation.
A system as recited in claim 1, characterised in that the control means (MC) consist in a control panel (15') comprising indicators, buttons and selector switches, said controls namely being a power on indictor (1'), an intermittent indicator light (2'), a hand-operated control (3') for manually cutting off the inner fluted wall/single face web, a hand-operated control (4') for manually cutting off the upper fluted wall/single face web, an open/closed circuit indicator (5'), a hand-operated control (6') for manually splicing the upper fluted wall/single face web, a hand-operated control (7') for manually splicing the inner fluted wall/single face web, a control (8') for activating the automatic execution of the web switching operations, a selector switch (9') for manual operation, a display (10') for showing the present combination of fluted walls, a display (11') for showing the next combination of fluted walls, a selector switch (12') for interfacing with the control computer, a selector switch (13') for interfacing with the inner fluted wall/single face web splicing unit, and a selector switch (14') for interfacing with the upper fluted wall/single face web splicing unit.
A system as recited in claim 1, characterised in that it comprises threading up means.
A system as recited in claim 1, characterised in that it comprises crossed photocells.
A system as recited in claim 1, characterised in that it comprises means for braking the fluted wall/single face web in the bridge.
A system as recited in the foregoing claims, characterised in that it allows to switch fluted walls at will and in all manners of choice.
A system as recited in claim 1, characterised in that it is in a position to basically carry out two operations: the threading up of the fluted wall/single face web within the drying table, and the cutting off of the fluted wall/single face web.
A system as recited in claim 13, characterised in that in the case of two fluted walls/single face webs (CES; CII) said operations consist in anyhow switching from single fluted wall as the inner fluted wall/single face web to double fluted wall by threading up the upper fluted wall/single face web; from single fluted wall as the upper fluted wall/single face web to double fluted wall by threading up the inner fluted wall/single face web; from double fluted wall to single fluted wall as the inner fluted wall/single face web; and from double fluted wall to single fluted wall as the upper fluted wall/single face web.
A system as recited in the foregoing claims, characterised in that it allows to keep the fluted wall in storage in the conventional storage means of the corrugator till again threading it up.