ITBO940290A1 - DEVICE FOR WELDING BETWEEN TWO TAPES OF MATERIAL FOR WRAPPING. - Google Patents

DEVICE FOR WELDING BETWEEN TWO TAPES OF MATERIAL FOR WRAPPING. Download PDF

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Publication number
ITBO940290A1
ITBO940290A1 IT94BO000290A ITBO940290A ITBO940290A1 IT BO940290 A1 ITBO940290 A1 IT BO940290A1 IT 94BO000290 A IT94BO000290 A IT 94BO000290A IT BO940290 A ITBO940290 A IT BO940290A IT BO940290 A1 ITBO940290 A1 IT BO940290A1
Authority
IT
Italy
Prior art keywords
conveyor
tape
welding
chamber
source
Prior art date
Application number
IT94BO000290A
Other languages
Italian (it)
Inventor
Silvano Boriani
Antonio Gamberini
Original Assignee
Gd Spa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Gd Spa filed Critical Gd Spa
Priority to IT94BO000290A priority Critical patent/ITBO940290A1/en
Publication of ITBO940290A0 publication Critical patent/ITBO940290A0/en
Priority to GB9510915A priority patent/GB2290498B/en
Priority to DE1995119844 priority patent/DE19519844A1/en
Publication of ITBO940290A1 publication Critical patent/ITBO940290A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7841—Holding or clamping means for handling purposes
    • B29C65/7847—Holding or clamping means for handling purposes using vacuum to hold at least one of the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/45—Joining of substantially the whole surface of the articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/47—Joining single elements to sheets, plates or other substantially flat surfaces
    • B29C66/472—Joining single elements to sheets, plates or other substantially flat surfaces said single elements being substantially flat
    • B29C66/4722—Fixing strips to surfaces other than edge faces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B29C66/81811—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the welding jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83415—Roller, cylinder or drum types the contact angle between said rollers, cylinders or drums and said parts to be joined being a non-zero angle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83417—Roller, cylinder or drum types said rollers, cylinders or drums being hollow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91411—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the parts to be joined, e.g. the joining process taking the temperature of the parts to be joined into account
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
    • B29C66/91423—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools using joining tools having different temperature zones or using several joining tools with different temperatures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91431—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature the temperature being kept constant over time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/932—Measuring or controlling the joining process by measuring or controlling the speed by measuring the speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/96—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process
    • B29C66/961—Measuring or controlling the joining process characterised by the method for implementing the controlling of the joining process involving a feedback loop mechanism, e.g. comparison with a desired value
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/0046—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by constructional aspects of the apparatus
    • B32B37/0053—Constructional details of laminating machines comprising rollers; Constructional features of the rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/934—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed
    • B29C66/93441—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed the speed being non-constant over time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/93—Measuring or controlling the joining process by measuring or controlling the speed
    • B29C66/934—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed
    • B29C66/93451—Measuring or controlling the joining process by measuring or controlling the speed by controlling or regulating the speed by controlling or regulating the rotational speed, i.e. the speed of revolution

Description

D E S C R I Z I O N E DESCRIPTION

dell'invenzione Industriale dal titolo: of the Industrial invention entitled:

"Dispositivo per saldare tra loro due nastri "Device for welding two tapes together

di materiale per incarto." of material for wrapping. "

La presente invenzione concerne un dispositivo per saldare tra loro due nastri di materiale per incarto. The present invention relates to a device for welding two strips of wrapping material together.

Più in particolare la presente invenzione concerne un dispositivo per saldare un nastrino a strappo ad un nastro di materiale per incarto, ed è vantaggiosamente utilizzabile nelle macchine sovraincartatrici di pacchetti di sigarette in rispettivi fogli di materiale trasparente. In tali macchine sovraincartatrici 1 pacchetti di sigarette vengono avvolti entro corrispondenti involucri dotati di un nastrino a strappo, solitamente realizzato in materiale plastico, che viene applicato sul foglio di materiale per sovraincarto per consentire una lacerazione guidata e predefinlta dell'Involucro stesso, così da facilitare l'apertura del pacchetto di sigarette. More particularly, the present invention relates to a device for sealing a tear-off tape to a tape of wrapping material, and it is advantageously usable in overwrapping machines for packets of cigarettes in respective sheets of transparent material. In these overwrapping machines, the cigarette packets are wrapped in corresponding envelopes equipped with a tear-off tape, usually made of plastic material, which is applied to the sheet of overwrapping material to allow a guided and predefined tearing of the wrapping itself, so as to facilitate opening the pack of cigarettes.

Solitamente i nastrini a strappo vengono applicati a nastri, da cui verranno separati i fogli di materiale per sovraincarto, mediante saldatura, la quale viene effettuata da mezzi di saldatura che cooperano con un rullo di rinvio aspirante. Il rullo di rinvio aspira contro la propria superficie di rivoluzione il nastrino ed il nastro, e li fa avanzare di fronte ai mezzi di saldatura che provvedono a comprimere contro il rullo stesso nastrino e materiale da incarto sino alla loro reciproca saldatura. Usually the tear-off tapes are applied to tapes, from which the sheets of material for overwrapping will be separated, by welding, which is carried out by welding means which cooperate with a suction return roller. The deflection roller sucks the ribbon and the ribbon against its own surface of revolution, and makes them advance in front of the sealing means which compress the ribbon and wrapping material against the roller until they are reciprocally sealed.

La temperatura dei mezzi saldatori è determinata in funzione delle caratteristiche degli elementi da saldare, mentre la velocità angolare del rullo di rinvio è funzione della velocità operativa della macchina confezionatrice. The temperature of the sealing means is determined according to the characteristics of the elements to be sealed, while the angular speed of the return roller is a function of the operating speed of the packaging machine.

La saldatura tra nastro di materiale da incarto e nastrino può venire eseguita sia per fusione di uno strato di materiale ceroso o di materiale plastico che fonde, noto col termine tecnico"hot melt", con cui è stato preventivamente ricoperto il nastrino, oppure mediante termosaldatura per fusione diretta della sostanza termosaldabile di cui sono costituiti i nastri. The welding between the wrapping material tape and the ribbon can be performed either by melting a layer of waxy material or plastic material that melts, known by the technical term "hot melt", with which the tape has been previously covered, or by heat sealing by direct fusion of the heat-sealable substance of which the tapes are made.

Qualora si utilizzi il materiale ceroso, la temperatura di esercizio dei mezzi saldatori è relativamente bassa, e tale da non provocare alcun danno qualora il nastrino ed il nastro permangano a tale temperatura per periodi di tempo superiori al previsto, a causa di una diminuzione di velocità della macchina. If waxy material is used, the operating temperature of the welding means is relatively low, and such as not to cause any damage if the tape and the tape remain at this temperature for longer than expected periods of time, due to a decrease in speed. of the car.

I problemi insorgono con il materiale plastico"hot melt" e con la saldatura del nastrino e del nastro mediante loro termofusione: in questo caso le temperature in gioco sono più elevate, e solo un ben determinato periodo di permanenza del nastro e del nastrino a tale temperatura consente una saldatura senza danni. Problems arise with the "hot melt" plastic material and with the welding of the tape and the tape by means of their thermofusion: in this case the temperatures involved are higher, and only a well determined period of permanence of the tape and the tape at this temperature allows for damage-free welding.

Le macchine confezionatrici in questione, però, a causa di motivi di vario genere, possono ridurre temporaneamente la velocità operativa. Un rallentamento della velocità operativa della macchina confezionatrice si traduce in un rallentamento del rullo di rinvio, e quindi in un aumento del tempo di permanenza del nastrino e del nastro tra rullo di rinvio e mezzi saldatori, con conseguente danneggiamento del nastro e del nastrino stessi. The packaging machines in question, however, due to various reasons, can temporarily reduce the operating speed. A slowing down of the operating speed of the packaging machine results in a slowing down of the return roller, and therefore in an increase in the residence time of the belt and the belt between the return roller and the sealing means, with consequent damage to the belt and the belt themselves.

Scopo della presente Invenzione è fornire un dispositivo di saldatura in grado di evitare che il citato nastrino ed il citato nastro possano rimanere alla loro temperatura di saldatura per periodi di tempo superiori a quello prestabilito. Secondo la presente invenzione viene realizzato un dispositivo per saldare tra loro due nastri di materiale per incarto comprendente, da bande opposte dei detti nastri disposti tra loro a contatto, un convogliatore di presa ed avanzamento dei nastri stessi e mezzi saldatori disposti in prossimità del detto convogliatore e cooperanti con almeno una sua porzione, caratterizzato dal fatto che il detto convogliatore è dotato, almeno in corrispondenza della parte terminale della propria detta porzione cooperante con i detti mezzi saldatori, di mezzi di raffreddamento atti a regolare la temperatura dei detti nastri ancora sottoposti all'azione dei detti mezzi saldatori ed a mantenerla entro valori di sicurezza anche in caso di riduzione della velocità del detto convogliatore, ovvero atti a ridurre il periodo di permanenza dei detti nastri alla temperatura imposta dai detti mezzi saldatori. The object of the present invention is to provide a sealing device capable of preventing the aforementioned tape and the aforementioned tape from remaining at their sealing temperature for periods of time greater than the predetermined one. According to the present invention, a device is provided for welding together two strips of wrapping material comprising, from opposite bands of said strips arranged in contact with each other, a conveyor for picking up and advancing the strips themselves and sealing means arranged in proximity to said conveyor and cooperating with at least a portion thereof, characterized in that said conveyor is equipped, at least in correspondence with the terminal part of its own said portion cooperating with said sealing means, with cooling means adapted to regulate the temperature of said belts still subjected to action of said sealing means and to keep it within safety values even in the event of a reduction in the speed of said conveyor, or adapted to reduce the period of permanence of said strips at the temperature imposed by said sealing means.

L'invenzione è esposta più in dettaglio nel seguito con l'aiuto del disegno allegato, che rappresenta una forma di realizzazione puramente esemplificativa e non limitativa del dispositivo di saldatura secondo la presente invenzione in vista laterale schematica, con alcune parti sezionate per meglio illustrarne altre. The invention is set out in more detail below with the help of the attached drawing, which represents a purely exemplary and non-limiting embodiment of the welding device according to the present invention in schematic side view, with some parts sectioned to better illustrate others. .

Con riferimento alla figura, 11 dispositivo secondo la presente Invenzione è indicato nel suo complesso con 1 ed è associabile ad una macchina confezionatrice automatica, in particolare una macchina sovraincartatrice non illustrata, con la quale il dispositivo 1 stesso opera in sincronismo di fase. With reference to the figure, the device according to the present invention is indicated as a whole with 1 and can be associated with an automatic packaging machine, in particular an overwrapping machine not shown, with which the device 1 itself operates in phase synchronism.

Tale dispositivo 1 è utilizzabile per la saldatura reciproca di due nastri 2 e 3 di materiale per incarto, e consta di un convogliatore 4 aspirante e di mezzi saldatori 5 disposti da bande opposte dei nastri 2 e 3 che sono tra loro a contatto. I mezzi saldatori 5 sono disposti in prossimità di una porzione o settore 6 del convogliatore 4 e cooperano con essa per la saldatura dei nastri 2 e 3. This device 1 can be used for the mutual welding of two strips 2 and 3 of wrapping material, and consists of a suction conveyor 4 and sealing means 5 arranged on opposite bands of the strips 2 and 3 which are in contact with each other. The sealing means 5 are arranged in proximity to a portion or sector 6 of the conveyor 4 and cooperate with it for welding the strips 2 and 3.

Nella figura allegata è stato fatto espresso riferimento, senza alcuna intenzione limitativa relativamente alla portata della presente invenzione, al caso in cui si debba saldare un nastrino di prefrattura 2 ad un nastro di materiale per incarto 3. In the attached figure, express reference has been made, without any intention of limiting the scope of the present invention, to the case in which a pre-breaking strip 2 has to be welded to a strip of wrapping material 3.

Il convogliatore 4 è costituito da un rullo di rinvio comune sia al nastrino a strappo 2, che nel seguito verrà denominato semplicemente nastrino, sia al nastro 3 al quale 11 nastrino 2 deve venire saldato. Nella figura allegata sono stati omessi gli organi, noti, preposti all'alimentazione del nastrino 2 e del nastro 3 al rullo di rinvio 4. In tale figura è stato illustrato solamente un rullo pressore 13 disposto appena a monte dei mezzi saldatori 5 ed in grado di mantenere il nastro 3 a contatto con il nastrino 2 e contro la superficie periferica del rullo di rinvio 4. The conveyor 4 consists of a return roller common to both the tear-off tape 2, which will be referred to simply as the tape below, and to the tape 3 to which the tape 2 must be welded. In the attached figure, the known members for feeding the belt 2 and the belt 3 to the return roller 4 have been omitted. In this figure, only a pressure roller 13 arranged just upstream of the sealing means 5 and capable of to keep the belt 3 in contact with the belt 2 and against the peripheral surface of the idler roller 4.

I mezzi saldatori 5 sono illustrati come costituiti da una piastra riscaldante 16 conformata a settore di corona anulare ed operante in cooperazione con il settore 6 del rullo di rinvio 4. La piastra riscaldante 16 viene mantenuta ad una temperatura di esercizio calcolata in funzione del tempo di permanenza del nastrino 2 e del nastro 3 tra il rullo di rinvio 4 e la piastra riscaldante 16, ovvero in funzione del tempo necessario al nastrino 2 ed al nastro 3 per compiere l'intero percorso ad arco di circonferenza delimitato dal settore 6 e dalla piastra riscaldante 16 alla velocità di regime della citata macchina confezionatrice. The welding means 5 are illustrated as consisting of a heating plate 16 shaped as a sector of an annular crown and operating in cooperation with the sector 6 of the return roller 4. The heating plate 16 is maintained at an operating temperature calculated as a function of the operating time. permanence of the belt 2 and of the belt 3 between the return roller 4 and the heating plate 16, i.e. as a function of the time required for the belt 2 and the belt 3 to complete the entire arc-circumference path delimited by sector 6 and the plate heating 16 at the operating speed of the aforementioned packaging machine.

Il citato rullo di rinvio 4 è costituito da un nucleo 9 cilindrico interno fisso e da un mantello 10 pure cilindrico rotante attorno al nucleo 9 sul quale esso è calzato. Il nucleo 9 è dotato sulla sua periferia di una sede definente con il mantello 10 una camera 11 comunicante con una sorgente di depressione non illustrata. Tale camera 11 interessa almeno un tratto del settore 6 ed una porzione del nucleo 9 disposta a monte del settore 6 rispetto al senso di rotazione V del mantello 10. Il mantello 10 è dotato, lungo la sua intera superficie periferica, di fori 12 che pongono la camera 11 in comunicazione con l'esterno, cosicché in corrispondenza dei fori 12 comunicanti con la camera 11 si genera sulla superficie periferica del mantello 10 una depressione in grado di trattenere contro di essa il nastrino 2 ed il nastro 3 che vi giungono a contatto. The aforementioned idler roller 4 is constituted by a fixed internal cylindrical core 9 and by a cylindrical skirt 10 which also rotates around the core 9 on which it is fitted. The core 9 is equipped on its periphery with a seat defining with the shell 10 a chamber 11 communicating with a vacuum source not shown. This chamber 11 involves at least a portion of the sector 6 and a portion of the core 9 arranged upstream of the sector 6 with respect to the direction of rotation V of the shell 10. The shell 10 is equipped, along its entire peripheral surface, with holes 12 which place the chamber 11 in communication with the outside, so that in correspondence with the holes 12 communicating with the chamber 11 a depression is generated on the peripheral surface of the shell 10 capable of retaining against it the ribbon 2 and the ribbon 3 which come into contact with it .

Il rullo di rinvio 4 è dotato, almeno in corrispondenza della porzione terminale del proprio settore 6, di mezzi di raffreddamento 7 atti ad abbassare la temperatura del nastrino 2 e del nastro 3 ancora sottoposti all'azione della piastra riscaldante 16, ed a mantenere tale temperatura entro valori di sicurezza anche quando la velocità del rullo di rinvio 4 venga ridotta per un qualsiasi motivo. In altre parole, i mezzi di raffreddamento 7 sono in grado di regolare il periodo di tempo in cui il nastrino 2 ed il nastro 3 sono sottoposti alla temperatura della piastra riscaldante 16. The deflection roller 4 is equipped, at least in correspondence with the end portion of its sector 6, with cooling means 7 suitable for lowering the temperature of the ribbon 2 and of the ribbon 3 still subjected to the action of the heating plate 16, and to maintain this temperature within safe values even when the speed of the idler roller 4 is reduced for any reason. In other words, the cooling means 7 are able to regulate the period of time in which the tape 2 and the tape 3 are subjected to the temperature of the heating plate 16.

Naturalmente, tale regolazione avviene in funzione della riduzione di velocità che subisce il rullo di rinvio 4 rispetto alla sua velocità di regime. Naturally, this adjustment takes place as a function of the speed reduction that the idler roller 4 undergoes with respect to its operating speed.

Nella figura allegata, 1 mezzi di raffreddamento 7 sono costituiti da due camere 8 ricavate, l'una di seguito all'altra ma distintamente, nel settore 6 e comunicanti con una sorgente 14 di un fluido di raffreddamento asservita a rispettivi mezzi di controllo e comando 15. Quale sorgente 14 di fluido di raffreddamento viene preferibilmente utilizzata una sorgente di aria compressa. In the attached figure, the cooling means 7 consist of two chambers 8 formed, one after the other but distinctly, in sector 6 and communicating with a source 14 of a cooling fluid enslaved to respective control and command means. 15. A source of compressed air is preferably used as the source 14 of cooling fluid.

Osservando in particolare la forma di realizzazione esemplificativamente illustrata, le camere 8 sono realizzate nel settore 6 del nucleo 9 subito a valle della camera 11 con riferimento al verso di rotazione del mantello 10. Observing in particular the embodiment illustrated by way of example, the chambers 8 are made in the sector 6 of the core 9 immediately downstream of the chamber 11 with reference to the direction of rotation of the shell 10.

I mezzi di controllo e comando 15 controllano la velocità angolare del mantello 10 e comandano la sorgente di aria compressa 14, come indicato dalle frecce rappresentate. L'attivazione della sorgente di aria compressa 14 e/o la messa in comunicazione delle camera 8 con la sorgente di aria compressa 14 avviene, comunque, nella maniera che viene ora descritta. The control and command means 15 control the angular velocity of the shell 10 and control the source of compressed air 14, as indicated by the arrows shown. The activation of the source of compressed air 14 and / or the putting into communication of the chambers 8 with the source of compressed air 14 occurs, however, in the manner that is now described.

In condizioni di normale funzionamento, il mantello 10 trattiene sulla sua superficie periferica il nastrino 2 ed il nastro 3 grazie alla depressione generata sulla sua superficie periferica dalla camera 11 e dai fori 12. Questa azione di depressione termina non appena i fori 12 escono dalla comunicazione con la camera 11. I mezzi di controllo e comando 15 non attivano, in tali condizioni, la sorgente di aria compressa 14, cosicché il nastrino 2 ed il nastro 3 rimangono alla temperatura imposta dalla piastra riscaldante 16 lungo l'intero percorso delimitato dal settore 6 e dalla piastra riscaldante 16. Under normal operating conditions, the jacket 10 retains the tape 2 and the tape 3 on its peripheral surface thanks to the depression generated on its peripheral surface by the chamber 11 and the holes 12. This depression action ends as soon as the holes 12 leave the communication. with the chamber 11. The control and command means 15 do not activate, in these conditions, the source of compressed air 14, so that the tape 2 and the tape 3 remain at the temperature set by the heating plate 16 along the entire path delimited by the sector 6 and from the heating plate 16.

Qualora il mantello 10 subisca un rallentamento, i mezzi di controllo e comando 15 rilevano tale variazione, ed attivano la sorgente di aria compressa 14 ponendola in comunicazione con una o con entrambe le camere 8 in funzione della riduzione di velocità subita dal mantello 10. In seguito a ciò, quando il nastrino 2 ed il nastro 3 giungono in prossimità della prima camera 8 posta in comunicazione con la sorgente di aria compressa 14 essi vengono raffreddati ad una temperatura inferiore alla loro temperatura di fusione. If the shell 10 undergoes a slowdown, the control and command means 15 detect this variation, and activate the source of compressed air 14 placing it in communication with one or both chambers 8 as a function of the speed reduction undergone by the shell 10. In as a result, when the ribbon 2 and the ribbon 3 come near the first chamber 8 placed in communication with the compressed air source 14 they are cooled to a temperature lower than their melting temperature.

E' ovvio che porre la sorgente di aria compressa 14 in comunicazione solamente con la camera 8 più a valle o con entrambe significa ridurre la lunghezza del percorso che il nastrino 2 ed il nastro 3 compiono alla temperatura imposta dalla piastra riscaldante 16 e, quindi, significa ridurre il tempo di permanenza del nastrino 2 e del nastro 3 stessi a tale temperatura. Il fatto di porre la sola camera 8 a valle o entrambe le camere 8 in comunicazione con la sorgente di aria compressa 14 dipende dalla riduzione di velocità subita dal mantello 10: se tale riduzione di velocità è contenuta è sufficiente porre la sorgente di aria compressa 14 in comunicazione solo con la camera 8 a valle, mentre se la riduzione di velocità è maggiore si possono porre entrambe le camere 8 in comunicazione con la sorgente di aria compressa 14 per ridurre ulteriormente la lunghezza del percorso del nastrino 2 e del nastro 3 alla temperatura imposta dalla piastra riscaldante 16. It is obvious that placing the compressed air source 14 in communication only with the chamber 8 further downstream or with both means reducing the length of the path that the tape 2 and the tape 3 make at the temperature set by the heating plate 16 and, therefore, means reducing the residence time of the tape 2 and of the tape 3 themselves at this temperature. The fact of placing only the chamber 8 downstream or both chambers 8 in communication with the source of compressed air 14 depends on the reduction in speed undergone by the shell 10: if this reduction in speed is contained it is sufficient to place the source of compressed air 14 in communication only with the downstream chamber 8, while if the speed reduction is greater, both chambers 8 can be placed in communication with the compressed air source 14 to further reduce the length of the path of the tape 2 and of the tape 3 at the temperature set by the heating plate 16.

Nella figura allegata sono state illustrate due sole camere 8 di raffreddamento, ma si può prevedere di aumentarne il numero per variare con maggiore linearità la lunghezza del percorso compiuto dal nastrino 2 e dal nastro 3 alla temperatura imposta dalla piastra riscaldante 16. In the attached figure only two cooling chambers 8 have been illustrated, but it is possible to increase the number of them in order to vary with greater linearity the length of the path taken by the ribbon 2 and by the ribbon 3 at the temperature set by the heating plate 16.

Claims (8)

R I V E N D I C A Z I O N I 1) Dispositivo per saldare tra loro due nastri (2,3) di materiale per incarto comprendente, da bande opposte dei detti nastri (2,3) disposti tra loro a contatto, un convogliatore (4) di presa ed avanzamento dei nastri (2,3) stessi e mezzi saldatori (5) disposti in prossimità del detto convogliatore (4) e cooperanti con almeno una sua porzione (6), caratterizzato dal fatto che 11 detto convogliatore (4) è dotato, almeno in corrispondenza della parte terminale della propria detta porzione (6) cooperante con 1 detti mezzi saldatori (5), di mezzi di raffreddamento (7) atti a regolare la temperatura dei detti nastri (2,3) ancora sottoposti all'azione dei detti mezzi saldatori (5) ed a mantenerla entro valori di sicurezza anche in caso di riduzione della velocità del detto convogliatore (4), ovvero atti a ridurre il periodo di permanenza dei detti nastri (2,3) alla temperatura imposta dai detti mezzi saldatori (5). R I V E N D I C A Z I O N I 1) Device for welding together two strips (2,3) of wrapping material comprising, from opposite bands of said strips (2,3) arranged in contact with each other, a conveyor (4) for gripping and advancing the strips (2 , 3) themselves and welding means (5) arranged in proximity to said conveyor (4) and cooperating with at least one portion thereof (6), characterized in that said conveyor (4) is equipped, at least in correspondence with the terminal part of the own said portion (6) cooperating with said welding means (5), with cooling means (7) adapted to regulate the temperature of said strips (2,3) still subjected to the action of said welding means (5) and to keep it within safe values even in the event of a reduction in the speed of the said conveyor (4), or adapted to reduce the period of permanence of the said tapes (2,3) at the temperature imposed by the said sealing means (5). 2) Dispositivo secondo la rivendicazione 1, caratterizzato dal fatto che i detti mezzi di raffreddamento (7) sono atti a ridurre il periodo di permanenza dei detti nastri (2,3) alla temperatura imposta dai detti mezzi saldatori (5) in funzione della riduzione di velocità angolare subita dal detto convogliatore (4) rispetto ad una sua velocità angolare di regime. 2) Device according to claim 1, characterized by the fact that the said cooling means (7) are adapted to reduce the residence period of the said tapes (2,3) at the temperature set by the said sealing means (5) as a function of the reduction of angular velocity undergone by said conveyor (4) with respect to its steady angular velocity. 3) Dispositivo secondo la rivendicazione 1 o 2, caratterizzato dal fatto che i detti mezzi di raffreddamento (7) sono costituiti da almeno una camera (8) ricavata nella detta porzione (6) del detto convogliatore (4) e comunicante con una sorgente (14) di un fluido di raffreddamento. 3) Device according to claim 1 or 2, characterized in that said cooling means (7) consist of at least one chamber (8) formed in said portion (6) of said conveyor (4) and communicating with a source ( 14) of a cooling fluid. 4) Dispositivo secondo una qualsiasi delle rivendicazioni da 1 a 3, caratterizzato dal fatto che 1 detti mezzi di raffreddamento (7) sono costituiti da una o più camere (8) consecutive ricavate nella detta porzione (6) del detto convogliatore (4) e comunicanti con una sorgente (14) di un fluido di raffreddamento asservita a rispettivi mezzi di controllo e comando (15). 4) Device according to any one of claims 1 to 3, characterized in that said cooling means (7) consist of one or more consecutive chambers (8) formed in said portion (6) of said conveyor (4) and communicating with a source (14) of a cooling fluid enslaved to respective control and command means (15). 5) Dispositivo secondo la rivendicazione 3 o 4, caratterizzato dal fatto che la detta camera (8) comunica con una sorgente di aria compressa (14) asservita a rispettivi mezzi di controllo e comando (15). 5) Device according to claim 3 or 4, characterized in that said chamber (8) communicates with a source of compressed air (14) enslaved to respective control and command means (15). 6) Dispositivo secondo una qualsiasi delle rivendicazioni precedenti, in cui detti nastri (2,3) sono costituiti da un nastrino a strappo (2) e da un nastro (3) di materiale per Incarto sul quale il detto nastrino (2) deve venire applicato, ed 11 detto convogliatore (4) è costituito da un rullo di rinvio (4) rotante ed aspirante una cui porzione o settore (6) è disposto di fronte ai detti mezzi saldatori (5) e coopera con i mezzi saldatori (6) stessi, caratterizzato dal fatto che il detto rullo di rinvio (4) è dotato, almeno in corrispondenza di una parte terminale di un proprio settore (6) cooperante con i detti mezzi saldatori (5), dei detti mezzi di raffreddamento (7), i quali sono costituiti da almeno una camera (8) destinata ad essere posta in comunicazione con una rispettiva sorgente (14) di un fluido di raffreddamento ad opera di mezzi (15) di controllo della velocità del detto rullo di rinvio (4) e di comando dei detti mezzi di raffreddamento (7). 6) Device according to any one of the preceding claims, in which said tapes (2,3) consist of a tear-off tape (2) and of a tape (3) of wrapping material on which said tape (2) must be applied, and 11 said conveyor (4) is constituted by a return roller (4) rotating and sucking one of which portion or sector (6) is arranged in front of said welding means (5) and cooperates with the welding means (6) themselves, characterized in that the said return roller (4) is equipped, at least in correspondence with one end part of its own sector (6) cooperating with the said welding means (5), with the said cooling means (7), which consist of at least one chamber (8) intended to be placed in communication with a respective source (14) of a cooling fluid by means (15) for controlling the speed of said deflection roller (4) and for control of said cooling means (7). 7) Dispositivo secondo la rivendicazione 6, nel quale il detto rullo di rinvio (4) consta di un nucleo (9) interno fisso e di un mantello (10) cilindrico rotante attorno al detto nucleo (9); il detto nucleo (9) cilindrico essendo dotato sulla propria periferia di almeno una sede definente con il detto mantello (10) una camera (11) comunicante con una sorgente di depressione e contraffacciata, almeno in parte, ai detti mezzi saldatori (5); 11 detto mantello (10) essendo dotato, lungo l'intera sua superficie periferica, di fori (12) radiali passanti atti a venire ciclicamente in comunicazione con la detta camera in depressione (11) del detto nucleo (9) ed a generare una azione aspirante nei confronti del detto nastrino (2) e del detto nastro (3), caratterizzato dal fatto che il detto nucleo (9) presenta, a valle della rispettiva camera in depressione (11), almeno una camera (8) comunicante con una sorgente di un fluido di raffreddamento e costituente i detti mezzi di raffreddamento (7) atti a ridurre il periodo di permanenza del detto nastrino (2) e del detto nastro (3) alla temperatura imposta dai detti mezzi saldatori (5). 7) Device according to claim 6, in which said return roller (4) consists of a fixed internal core (9) and a cylindrical skirt (10) rotating around said core (9); said cylindrical core (9) being equipped on its periphery with at least one seat defining with said shell (10) a chamber (11) communicating with a vacuum source and facing, at least in part, to said welding means (5); 11 said shell (10) being equipped, along its entire peripheral surface, with radial through holes (12) adapted to come cyclically in communication with said vacuum chamber (11) of said core (9) and to generate an action suction towards said belt (2) and said belt (3), characterized in that said core (9) has, downstream of the respective vacuum chamber (11), at least one chamber (8) communicating with a source of a cooling fluid and constituting the said cooling means (7) adapted to reduce the period of permanence of the said tape (2) and of the said tape (3) at the temperature imposed by the said welding means (5). 8) Dispositivo per saldare tra loro due nastri di materiale per incarto, sostanzialmente come descritto con riferimento alla figura del disegno annesso. 8) Device for welding together two strips of wrapping material, substantially as described with reference to the figure of the attached drawing.
IT94BO000290A 1994-06-23 1994-06-23 DEVICE FOR WELDING BETWEEN TWO TAPES OF MATERIAL FOR WRAPPING. ITBO940290A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
IT94BO000290A ITBO940290A1 (en) 1994-06-23 1994-06-23 DEVICE FOR WELDING BETWEEN TWO TAPES OF MATERIAL FOR WRAPPING.
GB9510915A GB2290498B (en) 1994-06-23 1995-05-30 A device for bonding together two strips of wrapping material
DE1995119844 DE19519844A1 (en) 1994-06-23 1995-05-31 Device for welding two webs of wrapping material together

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Application Number Priority Date Filing Date Title
IT94BO000290A ITBO940290A1 (en) 1994-06-23 1994-06-23 DEVICE FOR WELDING BETWEEN TWO TAPES OF MATERIAL FOR WRAPPING.

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ITBO940290A1 true ITBO940290A1 (en) 1995-12-23

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Publication number Priority date Publication date Assignee Title
IT1279711B1 (en) * 1995-12-14 1997-12-16 Gd Spa METHOD AND DEVICE FOR WELDING A TAPE OF SMALL TRANSVERSAL DIMENSIONS TO A THERMAL TAPE
DE10157366A1 (en) * 2001-11-24 2003-05-28 Kiener Maschinenbau Gmbh Device for laminating or coating a substrate

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US4454704A (en) * 1981-11-18 1984-06-19 The Mead Corporation Heat control system for packaging machine
JPH06503522A (en) * 1990-12-04 1994-04-21 ヘクセル　コーポレーション Process for the preparation of thermoplastic honeycomb sandwich structures

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DE19519844A1 (en) 1996-01-04
GB2290498A (en) 1996-01-03

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