CA1211972A - Production for the manufacture of blanks and folding cartons - Google Patents
Production for the manufacture of blanks and folding cartonsInfo
- Publication number
- CA1211972A CA1211972A CA000443184A CA443184A CA1211972A CA 1211972 A CA1211972 A CA 1211972A CA 000443184 A CA000443184 A CA 000443184A CA 443184 A CA443184 A CA 443184A CA 1211972 A CA1211972 A CA 1211972A
- Authority
- CA
- Canada
- Prior art keywords
- sonotrode
- varnish
- anvil
- blanks
- blank
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/60—Uniting opposed surfaces or edges; Taping
- B31B50/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure, e.g. by welding
- B31B50/66—Uniting opposed surfaces or edges; Taping by applying heat or pressure, e.g. by welding by high-frequency electric heating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/26—Folding sheets, blanks or webs
- B31B50/44—Folding sheets, blanks or webs by plungers moving through folding dies
- B31B50/46—Folding sheets, blanks or webs by plungers moving through folding dies and interconnecting side walls
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/60—Uniting opposed surfaces or edges; Taping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B50/00—Making rigid or semi-rigid containers, e.g. boxes or cartons
- B31B50/60—Uniting opposed surfaces or edges; Taping
- B31B50/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure, e.g. by welding
Landscapes
- Making Paper Articles (AREA)
- Bending Of Plates, Rods, And Pipes (AREA)
- Error Detection And Correction (AREA)
- Table Devices Or Equipment (AREA)
- Arc Welding In General (AREA)
- Cartons (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
- Treatment Of Fiber Materials (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Rigid Containers With Two Or More Constituent Elements (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The under fig. 1 illustrated erecting unit 1 for erecting carton blanks 16, thereby producing folding cartons, shows apart from a shaping plate 2 and a plunger 6 two sonotrodes 8 and 9 moving back and forth in the direction of the arrows 10. These sonotrodes 8 and 9 produce ultrasound which heats and subsequently welds or sticks together the flaps of the blank 17 which is either made completely of synthetic mater-rial or is a blank 16 which is coated with synthetic material or a varnish.
(fig. 1)
The under fig. 1 illustrated erecting unit 1 for erecting carton blanks 16, thereby producing folding cartons, shows apart from a shaping plate 2 and a plunger 6 two sonotrodes 8 and 9 moving back and forth in the direction of the arrows 10. These sonotrodes 8 and 9 produce ultrasound which heats and subsequently welds or sticks together the flaps of the blank 17 which is either made completely of synthetic mater-rial or is a blank 16 which is coated with synthetic material or a varnish.
(fig. 1)
Description
:~Z~ 2 ~ E`it ContaLner AG, CH-7000 Chur, Bahnhofstrasse 8 (Switzerland) ~: Production procedure for the manu~acture o~ blanks ?. -- ~. ~
for producing folding cartons as well as e~uipment - . .
for the erecting and welding of same 'U~TRASONIC !
!
" ' ' : '', , ~
'' ' ,' The invention presented here concerns a process and a-manu~ac~
turing procedure -to erect carton blanks the printed surface o~ :
~`. ` which is coated with a protective varnis~ and join together the. :~.
exea~ed parts facing each other~
The manufacture of folding car~ons from die cut blanks ~oresees the application of heat sensitive adhesive to those pa~ts ~hi.ch~
are to be j~ined together immediately prior to int~oducin~.the blan~ into ~he erecting tool thus enabling one part to adhere to the other. Particularly during continuous ma~u~acture and - :
allowing fQr stoppages and faulty blanks the erecting mecha~ism inevitably accumulates a considerable amount o~ di~t whlch in ~ 5 . :
turn leads to high maintenance chargesO Should, however, the ad~
hesive be applied to the blank earlier on, then special heating equ~pment would be necessary to re-activate the adhesive. Final-ly in the case of synthetic products of weldable material throuyh- -~ 2-'7~
out, alternatively ~naterial with a coating of weldable synthetic material, special hot air jets would ~e re~uired to heat and soften the appropriate par-ts of the blank which are to be welded prior to guiding the blank in to the erectiny tool.
Quite apart from the fact ~hat the s~eps outlined abave are costly, they are also hostile to the environm~nt and what is more require a considerable amount of energy to heat up the adhesive or parts of the blank.
.: '; ~`'``' Furthermore the entire surface of the previously p~inted blanks -is continuously given a coating of protective varnish to pr~tect ~
the blanks against mechanical damage and to improve the sllpping -~properties during the erecting procedure. A dispersion varnlsh ; is used as protection varnish. -.
The object of thîs invention is to avoid these drawbacks and to ~establish a method including suitable equipment which provldes asimple and energy saving process for welding togPther the indi-vidually prepared blanks in a way that is also fxiendly to the environment.
.
The solution to this pro~lem lies in the following. At lea~t 1 o t~e ~ sides ~f the blank facing each other to be joined to- ;
gether are coated completely or in part with~a varnish o~ high solid content which is simultaneously serving as protection~var-nish, As soon as the blank has reached the point of application at the consumer's plant it is run through a special erecting unit~
The varnish applied to the blank is activated by the ultrasonic waYes which heat up the sealing area, thereby making the v~rnish at least stickily liquid and thereby~weldable~ ~
. ~ .
~; This method of joining the blank parts by using ultrasonic waves `
is the object of this invention. The dispersion varnish covers the entire surface of the blank, serving as pro~ection varnish ~, w3_ ~2~ 7i2 for the printed axea and as dispersion varnish for those parts of the blank which are welded together, all this in a single operationO No further operations are required. A perfect and clean weld is achieved. ~here is no surplus Adhesive ~ein~
squeezed out along the edges of the weld which could smudge on to the carton. What is ~lore, -there is no need to allocate time for preparato~y work when applying ultrasonic waves, as opposed to ho~melt and similar adhesives which need time to warm up, cleaning and other preparatory work.
As far as the actual varnish applied to the blanks is concerned~
the appropriate propor~ion of the ingredients would be appXox~
40~ acrilic resin and approx. 60% solvents which should preferab- ~
ly be watex with an add,ition of ammonia. This varnisll also has ~ ~, the advantag~ of high viscosity whereby the volume o~ flow mea-sured with a 4 m~m DIN cup would be approx, 60 - 70 seconds.
' ' ~ :-The application of this varnish to the various ~lanks or parts ~ i thereo~ is for all practical purposes best done by offset printO
The quantity of varnish to be applied should ~e around 7 ~ 8 `'~
grammes/wet weight per sqm.
To assure a s~ooth ~low of the varnish to the printing ma~hine ~-it ls an adva~tage ~o keep it in a c~ntainer fitted with a cy- ~
lindrical mould lagitator~ and a pump preferably of th~ centri- ;
fug~l variety~
' :
Ater the bla~ks have received the treatment outlined above they can be put through an autoplatten or similar machinery for die cutting in the usual manner and subsequently supplied in '-the ~lat to the consumer for further processing. To continue ~`
the process nf this invention it is advantageous to use an ap-pliance which is co-ordinated with the erectin~ tool on to which at leas~ one ultrasonic unit is mounted to syncllronise with the tool plunger and pressi~g against the carton flap to :~2.~ 7~2 ~
be welded wher~by ~he pisLon oL the un it slides out ~xertiIIg the required pressure ~o the carton flaps to be welded and then immediately returns to its previous position.
If the blanks to be used are in part or throughout coated with synthetic material then the parts to be welded are hea-ted by ultrasound at the connecting areas so that they can be welded intensively, particularly when the head of the ultra~
sonia unit is pressed fir]nly against the carton parts to be welded, whereby the plunger of the erecting tool inside the car-ton being formed acts as anvil. If on the other hand the ~lan~s to be erected are made of uncoated board, then the varnish of high solid value having been applied to the necessary parts in the manner described heretofore is react1vated by the ultraso-nic equipment and thereby made weldable.
" .
The ef~ect of ultrasonic equipment can be further enhanced ~y providing projections on the ~arts of $he plunger o~ the çrec-ting unit which then serve as anvil being immediately opposite ~he ultrasonic units. This would increase the specific area pressure during the application of the ultrasonic unit. Th~se pro~ections can have either pointed or blunted tips. They can also be de~eloped as shaped ribs which penetrate the board of the blanks which are to be welded, so that the dis~ance to th~
head of the ultrasonic equipment is reduced thereby improVing the ef~ect of the ultrasound.
~urthermore, it is of advantage if the appliance as outlined in this invention is equipped with a number of such movabl~ ultra sonic units which should appropriately operate jointly and in pairs being positioned opposite one another.
These ultrasonic appliances can also be moved pneumatically, and it is possible to adapt both the forward and retracting speed individually accordin~ to the circu~l~tances by fittin~
--S--rocker arms between the ultrasonic appliances and the pneumatic power unit.
Therefore, in accordance with the present invention, there is provided a method for forming cartons from sheet material blanks having sealing portions. The method comprises:
coating the blanks at sealing portions thereof with a varnish comprising thermoplastic solids in a liquid vehicle, the solids being present in sufficient amount to form a thermo-plastic seal, joining the sealing portions and positioning between a sonotrode face and back up anvil sealing surface carrying a plurality of space projections, compressing a sealing area of overlapped sealing portions with the projections biting into the portions to effectively deliver ultrasonic energy near to a seal line reducing the distance between the anvil s~aling surface and sonotrode to increase the effect of ultrasonic energy used to form a seal and heat sealing the portions using the sonotrode to seal the portions.
In accordance with a second aspect of the invention there is provided an apparatus for welding the overlapping portions of folding or rigid cartons formed from flat blanks coated on at least one side of each pair of overlapping portions with a varnish containing thermoplastic solids. The apparatus comprises: an anvil surface with a plurality of discontinuous projections thereon, a sonotrode wi-th a flat face, and means for clamping the overlapping portions between the sonotrode and the anvil surface with sufficient force to compress the overlapping portions in contact with the projections on the cw/~ s . .~ I
~ 2~
anvil surface, thereby reducing the distance between the sonotrode and the anvil at the welding interface of the two overlapping portions, increasing the pressure at the weld/ and forming a mechanical interlock at each weld.
Further details of the procedure according to this invention and its application are outlined in the following drawing showing an applied project as an example and the consequential claims as the outcome of this invention.
The illustrations are:
Fig. 1 Diagram of the equipment with blank fed in Fig. 2 Illustration according to fig. 1 but showing the erected blank Fig. 3 Application of the sonotrodes Fig. 4 A selector of fig. 3 on a larger scale Fig. 5 Interval and Fig. 6 Illustration according to fig. 1 showing a second blank fed in and the erected first blank In fig. 1 the strictly diagramatic ill~stration of the erecting unit 1 shows a shaping plate 2 which in this case has a rectangular opening 3. Below the shaping plate 2 there is a firmly fixed forming well 4 which can be fitted with an anci]lary base 5, if required as wellas support guides which have not been particulary illustrated. Above the shaping plate 2 there is a plunger 6 moving downwards in the direction of the arrow 7 through the opening 3 of the shaping plate
for producing folding cartons as well as e~uipment - . .
for the erecting and welding of same 'U~TRASONIC !
!
" ' ' : '', , ~
'' ' ,' The invention presented here concerns a process and a-manu~ac~
turing procedure -to erect carton blanks the printed surface o~ :
~`. ` which is coated with a protective varnis~ and join together the. :~.
exea~ed parts facing each other~
The manufacture of folding car~ons from die cut blanks ~oresees the application of heat sensitive adhesive to those pa~ts ~hi.ch~
are to be j~ined together immediately prior to int~oducin~.the blan~ into ~he erecting tool thus enabling one part to adhere to the other. Particularly during continuous ma~u~acture and - :
allowing fQr stoppages and faulty blanks the erecting mecha~ism inevitably accumulates a considerable amount o~ di~t whlch in ~ 5 . :
turn leads to high maintenance chargesO Should, however, the ad~
hesive be applied to the blank earlier on, then special heating equ~pment would be necessary to re-activate the adhesive. Final-ly in the case of synthetic products of weldable material throuyh- -~ 2-'7~
out, alternatively ~naterial with a coating of weldable synthetic material, special hot air jets would ~e re~uired to heat and soften the appropriate par-ts of the blank which are to be welded prior to guiding the blank in to the erectiny tool.
Quite apart from the fact ~hat the s~eps outlined abave are costly, they are also hostile to the environm~nt and what is more require a considerable amount of energy to heat up the adhesive or parts of the blank.
.: '; ~`'``' Furthermore the entire surface of the previously p~inted blanks -is continuously given a coating of protective varnish to pr~tect ~
the blanks against mechanical damage and to improve the sllpping -~properties during the erecting procedure. A dispersion varnlsh ; is used as protection varnish. -.
The object of thîs invention is to avoid these drawbacks and to ~establish a method including suitable equipment which provldes asimple and energy saving process for welding togPther the indi-vidually prepared blanks in a way that is also fxiendly to the environment.
.
The solution to this pro~lem lies in the following. At lea~t 1 o t~e ~ sides ~f the blank facing each other to be joined to- ;
gether are coated completely or in part with~a varnish o~ high solid content which is simultaneously serving as protection~var-nish, As soon as the blank has reached the point of application at the consumer's plant it is run through a special erecting unit~
The varnish applied to the blank is activated by the ultrasonic waYes which heat up the sealing area, thereby making the v~rnish at least stickily liquid and thereby~weldable~ ~
. ~ .
~; This method of joining the blank parts by using ultrasonic waves `
is the object of this invention. The dispersion varnish covers the entire surface of the blank, serving as pro~ection varnish ~, w3_ ~2~ 7i2 for the printed axea and as dispersion varnish for those parts of the blank which are welded together, all this in a single operationO No further operations are required. A perfect and clean weld is achieved. ~here is no surplus Adhesive ~ein~
squeezed out along the edges of the weld which could smudge on to the carton. What is ~lore, -there is no need to allocate time for preparato~y work when applying ultrasonic waves, as opposed to ho~melt and similar adhesives which need time to warm up, cleaning and other preparatory work.
As far as the actual varnish applied to the blanks is concerned~
the appropriate propor~ion of the ingredients would be appXox~
40~ acrilic resin and approx. 60% solvents which should preferab- ~
ly be watex with an add,ition of ammonia. This varnisll also has ~ ~, the advantag~ of high viscosity whereby the volume o~ flow mea-sured with a 4 m~m DIN cup would be approx, 60 - 70 seconds.
' ' ~ :-The application of this varnish to the various ~lanks or parts ~ i thereo~ is for all practical purposes best done by offset printO
The quantity of varnish to be applied should ~e around 7 ~ 8 `'~
grammes/wet weight per sqm.
To assure a s~ooth ~low of the varnish to the printing ma~hine ~-it ls an adva~tage ~o keep it in a c~ntainer fitted with a cy- ~
lindrical mould lagitator~ and a pump preferably of th~ centri- ;
fug~l variety~
' :
Ater the bla~ks have received the treatment outlined above they can be put through an autoplatten or similar machinery for die cutting in the usual manner and subsequently supplied in '-the ~lat to the consumer for further processing. To continue ~`
the process nf this invention it is advantageous to use an ap-pliance which is co-ordinated with the erectin~ tool on to which at leas~ one ultrasonic unit is mounted to syncllronise with the tool plunger and pressi~g against the carton flap to :~2.~ 7~2 ~
be welded wher~by ~he pisLon oL the un it slides out ~xertiIIg the required pressure ~o the carton flaps to be welded and then immediately returns to its previous position.
If the blanks to be used are in part or throughout coated with synthetic material then the parts to be welded are hea-ted by ultrasound at the connecting areas so that they can be welded intensively, particularly when the head of the ultra~
sonia unit is pressed fir]nly against the carton parts to be welded, whereby the plunger of the erecting tool inside the car-ton being formed acts as anvil. If on the other hand the ~lan~s to be erected are made of uncoated board, then the varnish of high solid value having been applied to the necessary parts in the manner described heretofore is react1vated by the ultraso-nic equipment and thereby made weldable.
" .
The ef~ect of ultrasonic equipment can be further enhanced ~y providing projections on the ~arts of $he plunger o~ the çrec-ting unit which then serve as anvil being immediately opposite ~he ultrasonic units. This would increase the specific area pressure during the application of the ultrasonic unit. Th~se pro~ections can have either pointed or blunted tips. They can also be de~eloped as shaped ribs which penetrate the board of the blanks which are to be welded, so that the dis~ance to th~
head of the ultrasonic equipment is reduced thereby improVing the ef~ect of the ultrasound.
~urthermore, it is of advantage if the appliance as outlined in this invention is equipped with a number of such movabl~ ultra sonic units which should appropriately operate jointly and in pairs being positioned opposite one another.
These ultrasonic appliances can also be moved pneumatically, and it is possible to adapt both the forward and retracting speed individually accordin~ to the circu~l~tances by fittin~
--S--rocker arms between the ultrasonic appliances and the pneumatic power unit.
Therefore, in accordance with the present invention, there is provided a method for forming cartons from sheet material blanks having sealing portions. The method comprises:
coating the blanks at sealing portions thereof with a varnish comprising thermoplastic solids in a liquid vehicle, the solids being present in sufficient amount to form a thermo-plastic seal, joining the sealing portions and positioning between a sonotrode face and back up anvil sealing surface carrying a plurality of space projections, compressing a sealing area of overlapped sealing portions with the projections biting into the portions to effectively deliver ultrasonic energy near to a seal line reducing the distance between the anvil s~aling surface and sonotrode to increase the effect of ultrasonic energy used to form a seal and heat sealing the portions using the sonotrode to seal the portions.
In accordance with a second aspect of the invention there is provided an apparatus for welding the overlapping portions of folding or rigid cartons formed from flat blanks coated on at least one side of each pair of overlapping portions with a varnish containing thermoplastic solids. The apparatus comprises: an anvil surface with a plurality of discontinuous projections thereon, a sonotrode wi-th a flat face, and means for clamping the overlapping portions between the sonotrode and the anvil surface with sufficient force to compress the overlapping portions in contact with the projections on the cw/~ s . .~ I
~ 2~
anvil surface, thereby reducing the distance between the sonotrode and the anvil at the welding interface of the two overlapping portions, increasing the pressure at the weld/ and forming a mechanical interlock at each weld.
Further details of the procedure according to this invention and its application are outlined in the following drawing showing an applied project as an example and the consequential claims as the outcome of this invention.
The illustrations are:
Fig. 1 Diagram of the equipment with blank fed in Fig. 2 Illustration according to fig. 1 but showing the erected blank Fig. 3 Application of the sonotrodes Fig. 4 A selector of fig. 3 on a larger scale Fig. 5 Interval and Fig. 6 Illustration according to fig. 1 showing a second blank fed in and the erected first blank In fig. 1 the strictly diagramatic ill~stration of the erecting unit 1 shows a shaping plate 2 which in this case has a rectangular opening 3. Below the shaping plate 2 there is a firmly fixed forming well 4 which can be fitted with an anci]lary base 5, if required as wellas support guides which have not been particulary illustrated. Above the shaping plate 2 there is a plunger 6 moving downwards in the direction of the arrow 7 through the opening 3 of the shaping plate
2 and through the forming well 4.
cw/~ 5a -On both sides of the forming well 4 are the heads of the ultrasonic appliance, the sonotrodes 8 and 9, producing ultrasound. These sonotrodes 8 and 9 move horizontally in the direction of cw/J~ - 5b ~
. ;. .
the arrows marke~ l0 .~ionc3 ~lle guidc rods marke~ Jhi~h in turn are connected to ~he pneulllatic cylinder 12 AS shown in fig. 1. I~ere it is possi~le, as can be seen in fig. 2, to fit a swivel-mountecl rocker al-m (rocker disc) 14 between the yuide rod 11 and the pneur,latic cyl inder 12 whi~h is mounted on a pivot 13 to which the ~uide rod 11 on the one hand and the piston rod 15 of the pneumatic cylLnder 12 on the other are connc-cted.
The operation of this appliance according to the inverltion is as follows: ~irst of all a blank 16 is put into position between the pulled up plunger 6 an(3 the shaping ~late 2 as seen in fig. 1 Those par~s of ~he blan~ which are to be welded together by ultrasound have receiv.d an applica~ion of varnish of high solid con~ent which has meanwhile hardened. After feeding in this blank 16, made of board in tl~is case, the plunger 6 moves down in the direction of the arrow 7 taking the blank 16 with it, so that the flaps 17 are bent upwards as they pass through the opening 3 in the shaping plate 2 therehy skimming the outer frame 18 of the plunger 6 as per fig. 2. ~or the sake of clarity forming tunnel 4 and ancillary ~ase 5 are left out in fig. 2.
' Once the procedure of .recting the flaps 17 of ~lank 16 is termi~
nated, the pneumatic cyliliders 12 allocated to the sonotrodes 8 and 9 ~o into actlon and push the sonotrodes 8 and 9 in the di-rection of the arrow 1~ against the flaps 17 of the erected blank 16i the plunger 6 serving as counter support. As the sonotrodes 8 and 9 are positioned ol~posite one another, the pressure exerted by tha pneumatic cylin(lers 12 is cancelled.
, To increase specifically the area pressure of the flat ends 19 of ~he sonotrodes 8 and 9, the outer frame 18 of the plunger 6 to which projection pins 20 pointing at the ends of the sonotro-:
_7_ ': ' - 7 ~ '7~
des 8 and 9 respeci,i~ely J~a~e beel1 fitl:ed, serves as anvil as can he seen in fig. ~ e inside sur~aces 21 of the b]ank 16 and the parts of the f1aps 17 wl~ich ~re to be welded together lie flat against these projection pins. lf these projections have a ribbed surface or projecting points, then these ribs or points penetrate into the parts of the blank~ pressed against them, thereby reducing the distance between the pluncJer 6 and the sonotrode facing it which brings a corresponding increase of the effect of ultrasound. To achieve a direct ~ontact bet-ween the end flaps 1g ~)f the sonotrodes 8 and 9 and the side flaps 17 of the blank, it is possible to cut out sec~ors of the forming well 4 thr~ gh which the sonotrodes 8 and 9 can pass. Incidentally the forn1ing well has been omitted from the diagrams fig. 2 to 5.
As soon as the end flaijs 19 of the sonotrodes 8 and ~ press against the side Ela~s of the blan~ 17 and thereby against the projections 20 on the sides of the plunger 6, the ultrasound turned' out by the sonotrodes 8 and 9 heats up the synthetic ma-terial of the blank, alt~rnatively the coating of synthetic ma-terial which has been applied to the blank, thereby welding the side flaps together. lf the blank 16 is made of board and has a coating of ~arnish - a~ outlined earlier on - then this is like-wise h a~ed up by ultrasound and the adjacent flaps are welded together with this heated varnish of high viscosity.
As per ~ig. 5 the sono~rodes 8 and 9 press against the blank flaps 17 for a silfficient length of time to weld the synthetic material and/or to harden the varnish between the blank flaps 17 thereby completing the welded join-t. The ~olded carton 22 i~
thereby produced.
Once this procedure is ~ver, the sonotrodes 8 and 9 are rctrac-ted in the opposite dilection of the arrows 10 return,in~ to their starting point - as shown under fig. 1 and 2 - and the plunger 6 is pu~l~c~ ~Ip in t~le (~pposi~e direction of ~he arrow 7. The support ~3~ides ~It.tached to th~ forming well 4 which are not specially illustra~ed, hold the finished carton 22 in po-sition as sllown in li~. 5. ~hen the plunger 6 has reached its original raise~ posi~ion, then a new blank 16 is fed on to the shaping ~late 2, thereL:y enabling a re~etition of the proce-dure outlined a~ove. ~ ilst moving down again, the plunger 6 erècts the second bl~nk 16 and thereby ejects the previously completed foldin~ carton 22 downwards. :~.
:
. o ~ 2 Referenc~ ~l'a~le ~;uide) .. . . _ 1 Erecting unit 2 Shaping plate
cw/~ 5a -On both sides of the forming well 4 are the heads of the ultrasonic appliance, the sonotrodes 8 and 9, producing ultrasound. These sonotrodes 8 and 9 move horizontally in the direction of cw/J~ - 5b ~
. ;. .
the arrows marke~ l0 .~ionc3 ~lle guidc rods marke~ Jhi~h in turn are connected to ~he pneulllatic cylinder 12 AS shown in fig. 1. I~ere it is possi~le, as can be seen in fig. 2, to fit a swivel-mountecl rocker al-m (rocker disc) 14 between the yuide rod 11 and the pneur,latic cyl inder 12 whi~h is mounted on a pivot 13 to which the ~uide rod 11 on the one hand and the piston rod 15 of the pneumatic cylLnder 12 on the other are connc-cted.
The operation of this appliance according to the inverltion is as follows: ~irst of all a blank 16 is put into position between the pulled up plunger 6 an(3 the shaping ~late 2 as seen in fig. 1 Those par~s of ~he blan~ which are to be welded together by ultrasound have receiv.d an applica~ion of varnish of high solid con~ent which has meanwhile hardened. After feeding in this blank 16, made of board in tl~is case, the plunger 6 moves down in the direction of the arrow 7 taking the blank 16 with it, so that the flaps 17 are bent upwards as they pass through the opening 3 in the shaping plate 2 therehy skimming the outer frame 18 of the plunger 6 as per fig. 2. ~or the sake of clarity forming tunnel 4 and ancillary ~ase 5 are left out in fig. 2.
' Once the procedure of .recting the flaps 17 of ~lank 16 is termi~
nated, the pneumatic cyliliders 12 allocated to the sonotrodes 8 and 9 ~o into actlon and push the sonotrodes 8 and 9 in the di-rection of the arrow 1~ against the flaps 17 of the erected blank 16i the plunger 6 serving as counter support. As the sonotrodes 8 and 9 are positioned ol~posite one another, the pressure exerted by tha pneumatic cylin(lers 12 is cancelled.
, To increase specifically the area pressure of the flat ends 19 of ~he sonotrodes 8 and 9, the outer frame 18 of the plunger 6 to which projection pins 20 pointing at the ends of the sonotro-:
_7_ ': ' - 7 ~ '7~
des 8 and 9 respeci,i~ely J~a~e beel1 fitl:ed, serves as anvil as can he seen in fig. ~ e inside sur~aces 21 of the b]ank 16 and the parts of the f1aps 17 wl~ich ~re to be welded together lie flat against these projection pins. lf these projections have a ribbed surface or projecting points, then these ribs or points penetrate into the parts of the blank~ pressed against them, thereby reducing the distance between the pluncJer 6 and the sonotrode facing it which brings a corresponding increase of the effect of ultrasound. To achieve a direct ~ontact bet-ween the end flaps 1g ~)f the sonotrodes 8 and 9 and the side flaps 17 of the blank, it is possible to cut out sec~ors of the forming well 4 thr~ gh which the sonotrodes 8 and 9 can pass. Incidentally the forn1ing well has been omitted from the diagrams fig. 2 to 5.
As soon as the end flaijs 19 of the sonotrodes 8 and ~ press against the side Ela~s of the blan~ 17 and thereby against the projections 20 on the sides of the plunger 6, the ultrasound turned' out by the sonotrodes 8 and 9 heats up the synthetic ma-terial of the blank, alt~rnatively the coating of synthetic ma-terial which has been applied to the blank, thereby welding the side flaps together. lf the blank 16 is made of board and has a coating of ~arnish - a~ outlined earlier on - then this is like-wise h a~ed up by ultrasound and the adjacent flaps are welded together with this heated varnish of high viscosity.
As per ~ig. 5 the sono~rodes 8 and 9 press against the blank flaps 17 for a silfficient length of time to weld the synthetic material and/or to harden the varnish between the blank flaps 17 thereby completing the welded join-t. The ~olded carton 22 i~
thereby produced.
Once this procedure is ~ver, the sonotrodes 8 and 9 are rctrac-ted in the opposite dilection of the arrows 10 return,in~ to their starting point - as shown under fig. 1 and 2 - and the plunger 6 is pu~l~c~ ~Ip in t~le (~pposi~e direction of ~he arrow 7. The support ~3~ides ~It.tached to th~ forming well 4 which are not specially illustra~ed, hold the finished carton 22 in po-sition as sllown in li~. 5. ~hen the plunger 6 has reached its original raise~ posi~ion, then a new blank 16 is fed on to the shaping ~late 2, thereL:y enabling a re~etition of the proce-dure outlined a~ove. ~ ilst moving down again, the plunger 6 erècts the second bl~nk 16 and thereby ejects the previously completed foldin~ carton 22 downwards. :~.
:
. o ~ 2 Referenc~ ~l'a~le ~;uide) .. . . _ 1 Erecting unit 2 Shaping plate
3 Opening in 2
4 Eorming well S Ancillary base 6 Plunger - 7 Arrow 8 Sonotrode 9 Sonotrode Arrow uide rod 12 Pneumatic cylind~r 13 Pivot 14 Rocker arm ~rocker disc~
15 -Piston rod of 12 .
1 b Blank 17 Blank flaps of 16 18 Outer fram~ of 6 1~ End flaps of 8 and 9 Projections on 18 21 Inside surface of 17 22 Folding carton .
15 -Piston rod of 12 .
1 b Blank 17 Blank flaps of 16 18 Outer fram~ of 6 1~ End flaps of 8 and 9 Projections on 18 21 Inside surface of 17 22 Folding carton .
Claims (11)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. Method for forming cartons from sheet material blanks having sealing portions, said method comprising, coating said blanks at sealing portions thereof with a varnish comprising thermoplastic solids in a liquid vehicle said solids being present in sufficient amount to form a thermoplastic seal, joining said sealing portions and positioning between a sonotrode face and back up anvil sealing surface carrying a plurality of spaced projections, compressing a sealing area of overlapped sealing portions with said projections biting into said portions to effectively deliver ultrasonic energy near to a seal line reducing the distance between said anvil sealing surface and sonotrode to increase the effect of ultrasonic energy used to form a seal and heat sealing said portions using said sonotrode to seal said portions.
2. A method in accordance with the method of claim 1 wherein said blanks are substantially flat when coated with said varnish, said coating is carried out by high speed printing means, and die cutting said blanks prior to said joining and after said coating.
3. A method in accordance with the method of claim 2 wherein said varnish has a solids content of from about 30 to about 60% by weight and is applied at a rate of from 4 to about 10 grams/sq. meter.
4. A method in accordance with the method of claim 1 comprising applying said varnish by high speed printing techniques and at a solids content of from 30 to 60% whereby said varnish can be heated and sealed by ultrasonic sound.
5. A method in accordance with the method of claim 4 wherein said varnish comprises 40% acrylic resin and approximately 60% of an aqueous solvent having a viscosity of from 60 to 70 seconds with a 4 m/m DIN cup.
6. A method in accordance with the method of claim 5 wherein the varnish is applied to the blank at a weight of between 7 and 8 grams per square meter with feeding means utilizing a pump.
7. A method in accordance with the method of claim 6 wherein said pump is a centrifugal pump feeding an offset printing machine to apply said varnish.
8. An apparatus for welding the overlapping portions of folding or rigid cartons formed from flat blanks coated on at least one side of each pair of overlapping portions with a varnish containing thermoplastic solids, said apparatus comprising an anvil surface with a plurality of discontinuous projections thereon, a sonotrode with a flat face, and means for clamping the said overlapping portions between the sonotrode and the anvil surface with sufficient force to compress the overlapping portions in contact with the said projections on the anvil surface, thereby reducing the distance between the sonotrode and the anvil at the welding interface of the two overlapping portions, increasing the pressure at the weld, and forming a mechanical interlock at each weld.
9. An apparatus in accordance with claim 8 and further comprising said anvil being aligned with said ultrasonic sound producing sonotrode and acting in conjunction with a folding unit for folding a carton blank to be fed between said anvil and said sonotrode.
10. An apparatus in accordance with claim 9 and further comprising a second sonotrode opposed to said first-mentioned sonotrode and mounted for simultaneous relative movement toward and away from said anvil whereby said sonotrodes apply equal and opposite force simultaneously against said anvil.
11. A method for forming rigid cartons from flat blanks coated wholly or in part with a varnish containing thermoplastic solids in an amount sufficient to constitute a bonding medium when activated by heat, said blanks being die cut to provide base, side, end, and overlapping flap elements, said method comprising placing the blank over an open female forming die so made as to define the corners of the carton base element, and to fold inward the side, end, and overlapping flap elements, pressing the blank into the said open forming die with a plunger having projections on those of its surfaces which face each pair of carton elements which are to he bonded, bringing the flat face of a sonotrode against the outer of each pair of elements to be bonded with pressure sufficient to cause the projections on the surfaces of the plunger opposite to compress the said pair of elements in contact therewith, thereby reducing the distance between each sonotrode and the anvil at the welding interfaces of the pair of elements to be bonded, energizing the sonotrodes to heat the bonding medium to at least a tacky state, deenergizing the sonotrodes while holding them under pressure against the outer surfaces of the formed carton until the bond has been effected, and withdrawing the sonotrodes to their initial positions.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19828215958U DE8215958U1 (en) | 1982-06-02 | 1982-06-02 | DEVICE FOR RISING UP AND WELDING THE PRODUCTION OF FOLDING CARTONS OF SERVING CUTS |
| DE19823246325 DE3246325A1 (en) | 1982-06-02 | 1982-12-15 | Process for producing blanks to be used for forming folding boxes as well as an apparatus for setting up and welding the same |
| DEP3246325.1 | 1982-12-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1211972A true CA1211972A (en) | 1986-09-30 |
Family
ID=25806553
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000443184A Expired CA1211972A (en) | 1982-06-02 | 1983-12-13 | Production for the manufacture of blanks and folding cartons |
Country Status (10)
| Country | Link |
|---|---|
| EP (1) | EP0095628B1 (en) |
| JP (1) | JPS59120441A (en) |
| AT (1) | ATE22844T1 (en) |
| AU (1) | AU568322B2 (en) |
| CA (1) | CA1211972A (en) |
| DE (3) | DE8215958U1 (en) |
| FI (1) | FI834569A (en) |
| NO (1) | NO162408C (en) |
| NZ (1) | NZ206569A (en) |
| ZA (1) | ZA839330B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT386560B (en) * | 1985-12-20 | 1988-09-12 | Neupack Gmbh | Method of producing a container from board, in particular from moisture-sealing board, and a container of this type |
| DE19906873A1 (en) * | 1999-02-18 | 2000-08-24 | Branson Ultraschall | Ultrasonic welding device for joining layers of material, with two ultrasound units supplying ultrasonic energy to opposite sides simultaneously |
| WO2011110527A1 (en) | 2010-03-08 | 2011-09-15 | Basf Se | Microwave-activated adhesive compositions for producing collapsible box blanks |
| WO2011110482A1 (en) | 2010-03-08 | 2011-09-15 | Basf Se | Use of an adhesive composition which can be activated for producing collapsible box blanks |
| DE102013225737A1 (en) * | 2013-12-12 | 2015-06-18 | Robert Bosch Gmbh | Method for producing a packaging and packaging machine |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1761734C3 (en) * | 1968-07-01 | 1975-01-23 | Kliklok Corp., New York, N.Y. (V.St.A.) | Device for erecting and gluing the box corners of a blank provided with a thermoplastic coating on both sides |
| US3956975A (en) * | 1973-11-30 | 1976-05-18 | Ex-Cell-O Corporation | Packaging method and apparatus |
| US4011800A (en) * | 1976-03-31 | 1977-03-15 | Ex-Cell-O Corporation | Bottom seal horn and mandrel |
| GB1585153A (en) * | 1976-04-30 | 1981-02-25 | Freemantle A J | Manufacture of cartons |
| ZA775779B (en) * | 1976-10-08 | 1978-05-30 | Ex Cell O Corp | Carton sealing method and apparatus |
| JPS6042832B2 (en) * | 1977-10-18 | 1985-09-25 | 富士写真フイルム株式会社 | Ink composition for inkjet recording |
| US4187768A (en) * | 1977-11-15 | 1980-02-12 | Nihon Dixie Company, Limited | Method for the manufacture of a paper container |
| US4173554A (en) * | 1978-07-10 | 1979-11-06 | Sun Chemical Corporation | Aqueous printing inks with improved transfer properties |
| GB2093762A (en) * | 1981-03-02 | 1982-09-08 | Metal Box Co Ltd | Forming and/or closing cartons |
-
1982
- 1982-06-02 DE DE19828215958U patent/DE8215958U1/en not_active Expired
- 1982-12-15 DE DE19823246325 patent/DE3246325A1/en not_active Withdrawn
-
1983
- 1983-05-13 AT AT83104718T patent/ATE22844T1/en not_active IP Right Cessation
- 1983-05-13 DE DE8383104718T patent/DE3366867D1/en not_active Expired
- 1983-05-13 EP EP83104718A patent/EP0095628B1/en not_active Expired
- 1983-12-13 NO NO834589A patent/NO162408C/en unknown
- 1983-12-13 CA CA000443184A patent/CA1211972A/en not_active Expired
- 1983-12-13 NZ NZ206569A patent/NZ206569A/en unknown
- 1983-12-13 AU AU22353/83A patent/AU568322B2/en not_active Ceased
- 1983-12-13 FI FI834569A patent/FI834569A/en not_active Application Discontinuation
- 1983-12-15 JP JP58235251A patent/JPS59120441A/en active Pending
- 1983-12-15 ZA ZA839330A patent/ZA839330B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AU568322B2 (en) | 1987-12-24 |
| FI834569A (en) | 1984-06-16 |
| NO834589L (en) | 1984-06-18 |
| JPS59120441A (en) | 1984-07-12 |
| AU2235383A (en) | 1984-06-21 |
| NO162408B (en) | 1989-09-18 |
| ZA839330B (en) | 1984-08-29 |
| NZ206569A (en) | 1987-10-30 |
| DE3246325A1 (en) | 1984-06-20 |
| DE8215958U1 (en) | 1983-01-27 |
| EP0095628A1 (en) | 1983-12-07 |
| NO162408C (en) | 1990-01-03 |
| EP0095628B1 (en) | 1986-10-15 |
| DE3366867D1 (en) | 1986-11-20 |
| FI834569A0 (en) | 1983-12-13 |
| ATE22844T1 (en) | 1986-11-15 |
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| Date | Code | Title | Description |
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| MKEX | Expiry |