IT201700009680A1 - APPARATUS FOR THE TRANSVERSAL WELDING OF A MOVING TAPE - Google Patents
APPARATUS FOR THE TRANSVERSAL WELDING OF A MOVING TAPE Download PDFInfo
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- IT201700009680A1 IT201700009680A1 IT102017000009680A IT201700009680A IT201700009680A1 IT 201700009680 A1 IT201700009680 A1 IT 201700009680A1 IT 102017000009680 A IT102017000009680 A IT 102017000009680A IT 201700009680 A IT201700009680 A IT 201700009680A IT 201700009680 A1 IT201700009680 A1 IT 201700009680A1
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- IT
- Italy
- Prior art keywords
- welding
- contact areas
- anvil
- anvils
- belt
- Prior art date
Links
- 238000003466 welding Methods 0.000 claims description 65
- 230000001788 irregular Effects 0.000 claims description 18
- 238000013519 translation Methods 0.000 claims description 2
- 238000003491 array Methods 0.000 description 7
- 239000002131 composite material Substances 0.000 description 5
- 230000002745 absorbent Effects 0.000 description 3
- 239000002250 absorbent Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 230000002596 correlated effect Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000002547 anomalous effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000875 corresponding effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Classifications
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- 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
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
- A61F13/15707—Mechanical treatment, e.g. notching, twisting, compressing, shaping
- A61F13/15739—Sealing, e.g. involving cutting
-
- 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
- B29C65/08—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations
- B29C65/083—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil
- B29C65/087—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using ultrasonic vibrations using a rotary sonotrode or a rotary anvil using both a rotary sonotrode and a rotary anvil
-
- 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
- B29C65/7858—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 characterised by the feeding movement of the parts to be joined
- B29C65/7879—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 characterised by the feeding movement of the parts to be joined said parts to be joined moving in a closed path, e.g. a rectangular path
- B29C65/7882—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 characterised by the feeding movement of the parts to be joined said parts to be joined moving in a closed path, e.g. a rectangular path said parts to be joined moving in a circular path
- B29C65/7885—Rotary turret joining machines, i.e. having several joining tools moving around an axis
-
- 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
- B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
- B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
- B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
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- 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
- B29C66/306—Applying a mark during joining
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- 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
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/431—Joining the articles to themselves
-
- 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
- B29C66/814—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 design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8141—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81433—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned
-
- 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
- B29C66/814—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 design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8141—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81433—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned
- B29C66/81435—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined being toothed, i.e. comprising several teeth or pins, or being patterned comprising several parallel ridges, e.g. for crimping
-
- 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
- B29C66/814—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 design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8145—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/81463—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint
- B29C66/81465—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 design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a plurality of single pressing elements, e.g. a plurality of sonotrodes, or comprising a plurality of single counter-pressing elements, e.g. a plurality of anvils, said plurality of said single elements being suitable for making a single joint one placed behind the other in a single row in the feed direction
-
- 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
- B29C66/87—Auxiliary operations or devices
- B29C66/876—Maintenance or cleaning
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
- A61F2013/15821—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing
- A61F2013/15861—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing for bonding
- A61F2013/15869—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing for bonding with ultrasonic energy
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15577—Apparatus or processes for manufacturing
- A61F2013/15821—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing
- A61F2013/15861—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing for bonding
- A61F2013/15878—Apparatus or processes for manufacturing characterized by the apparatus for manufacturing for bonding by thermal bonding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/48—Wearing apparel
- B29L2031/4871—Underwear
- B29L2031/4878—Diapers, napkins
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Heart & Thoracic Surgery (AREA)
- Epidemiology (AREA)
- Biomedical Technology (AREA)
- Manufacturing & Machinery (AREA)
- Vascular Medicine (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Basic Packing Technique (AREA)
- Package Closures (AREA)
Description
“Apparecchio per la saldatura trasversale di un nastro in movimento” "Apparatus for transversal welding of a moving belt"
TESTO DELLA DESCRIZIONE TEXT OF THE DESCRIPTION
Campo dell'invenzione Field of the invention
La presente invenzione riguarda un apparecchio per la saldatura trasversale di un nastro avanzante in una direzione di macchina. The present invention relates to an apparatus for the transversal sealing of a web advancing in a machine direction.
L'invenzione è stata sviluppata in particolare in vista dell'applicazione a macchine per la produzione di articoli sanitari assorbenti. The invention has been developed in particular with a view to application to machines for the production of absorbent sanitary articles.
Descrizione della tecnica relativa Description of the related technique
Nel campo della produzione di articoli sanitari assorbenti si ha frequentemente la necessità di effettuare saldature trasversali su nastri compositi avanzanti in una direzione di macchina. Ad esempio, la produzione dei cosiddetti “training pants” prevede di formare un nastro composito costituito da una catena continua di sbozzi di prodotto in cui i singoli sbozzi sono orientati in direzione trasversale alla direzione di macchina. Il nastro composito continuo viene saldato ad intervalli regolari lungo direzioni trasversali alla direzione di macchina per formare linee di chiusura che si estendono lungo i fianchi dei singoli articoli e che conferiscono agli articoli una forma a mutandina. In the field of the production of absorbent sanitary articles there is frequently the need to carry out transverse welds on composite tapes advancing in a machine direction. For example, the production of the so-called “training pants” involves forming a composite belt consisting of a continuous chain of product blanks in which the individual blanks are oriented in a direction transverse to the machine direction. The continuous composite web is welded at regular intervals along directions transverse to the machine direction to form closure lines which extend along the sides of the individual articles and which give the articles a panty shape.
Una delle tecnologie più utilizzate per la saldatura dei materiali componenti gli articoli sanitari assorbenti è la saldatura ad ultrasuoni. Per effettuare saldature trasversali mediante unità di saldatura ad ultrasuoni il nastro in movimento viene serrato fra un sonotrodo ed un’incudine. Solitamente, l'incudine ha una pluralità di aree di contatto che definiscono un pattern di saldatura. One of the most used technologies for welding the materials that make up absorbent sanitary items is ultrasonic welding. To carry out transverse welds using ultrasonic welding units, the moving belt is clamped between a sonotrode and an anvil. Typically, the anvil has a plurality of contact areas that define a weld pattern.
Per effettuare saldature trasversali su nastri compositi in movimento mediante unità di saldatura ad ultrasuoni è necessario che il sonotrodo e l’incudine rimangano a contatto con il nastro in movimento per un certo periodo di tempo, necessario per trasferire l'energia di saldatura al nastro. To carry out transverse welds on moving composite belts using ultrasonic welding units, the sonotrode and anvil must remain in contact with the moving belt for a certain period of time, necessary to transfer the welding energy to the belt.
Per effettuare saldature trasversali ad ultrasuoni su nastri in movimento ad alta velocità si utilizzano spesso apparecchi di saldatura comprendenti una pluralità di unità di saldatura distanziate fra loro e mobili insieme al nastro in movimento. Spesso, le unità di saldatura, o una parte di esse, sono portate da una struttura rotante, girevole attorno ad un asse di rotazione ortogonale alla direzione di movimento del nastro. Il nastro composito si dispone sulla periferia della struttura rotante ed il tratto di nastro avvolto sulla periferia della struttura rotante coopera con una pluralità di unità di saldatura, ciascuna delle quali effettua una rispettiva saldatura trasversale sul nastro in movimento. In order to carry out ultrasonic transversal welds on belts moving at high speed, welding apparatuses are often used comprising a plurality of welding units spaced apart and movable together with the moving belt. Often, the welding units, or a part of them, are carried by a rotating structure, rotatable around an axis of rotation orthogonal to the direction of movement of the belt. The composite tape is arranged on the periphery of the rotating structure and the stretch of tape wound on the periphery of the rotating structure cooperates with a plurality of welding units, each of which carries out a respective transversal sealing on the moving belt.
Esempi di apparecchi di saldatura di questo tipo sono descritti, ad esempio, in WO-A1-02/078935, US-A-4758293, US-A-5660679, EP-A1-3095589, EP-A1-1609582. Examples of welding apparatus of this type are described, for example, in WO-A1-02 / 078935, US-A-4758293, US-A-5660679, EP-A1-3095589, EP-A1-1609582.
In un apparecchio di saldatura provvisto di una pluralità di unità di saldatura può verificarsi il caso in cui una o più delle unità di saldatura non funzionino correttamente e necessitino di un intervento di manutenzione. Il funzionamento anomalo di una o più delle unità di saldatura dell'apparecchio viene individuato dalla presenza di linee di saldatura irregolari o non conformi sul telo. Quando si rilevano linee di saldatura non conformi sul telo nello stato della tecnica attuale non esiste un metodo affidabile per individuare quale sia l'unità di saldatura che ha prodotto le saldature irregolari. In a welding apparatus provided with a plurality of welding units, it may occur that one or more of the welding units do not function correctly and require maintenance. The anomalous functioning of one or more of the welding units of the appliance is identified by the presence of irregular or non-conforming welding lines on the sheet. When detecting non-conforming weld lines on the sheet in the current state of the art, there is no reliable method of identifying which welding unit produced the irregular welds.
Scopo e sintesi dell'invenzione Purpose and summary of the invention
La presente invenzione si prefigge lo scopo di fornire un apparecchio che effettua la saldatura trasversale di un nastro in movimento mediante una pluralità di unità di saldatura, che consenta di individuare rapidamente le eventuali unità di saldatura che effettuano saldature irregolari. The present invention has the purpose of providing an apparatus which carries out the transversal welding of a moving strip by means of a plurality of welding units, which allows to quickly identify any welding units which carry out irregular welds.
Secondo la presente invenzione, tale scopo viene raggiunto da un apparecchio avente le caratteristiche formanti oggetto della rivendicazione 1. According to the present invention, this object is achieved by an apparatus having the characteristics forming the subject of claim 1.
Le rivendicazioni formano parte integrante dell'insegnamento somministrato in relazione all'invenzione. The claims form an integral part of the teaching administered in relation to the invention.
Breve descrizione dei disegni Brief description of the drawings
La presente invenzione verrà ora descritta dettagliatamente con riferimento ai disegni allegati, dati a puro titolo di esempio non limitativo, in cui: The present invention will now be described in detail with reference to the attached drawings, given purely by way of non-limiting example, in which:
- la figura 1 è una vista in elevazione frontale di un apparecchio secondo la presente invenzione, Figure 1 is a front elevation view of an apparatus according to the present invention,
- la figura 2 è una vista prospettica di un’incudine indicata dalla freccia II nella figura 1, - Figure 2 is a perspective view of an anvil indicated by arrow II in Figure 1,
- la figura 3 è un dettaglio in maggiore scala della parte indicata dalla freccia III nella figura 2, - figure 3 is a detail on a larger scale of the part indicated by arrow III in figure 2,
- la figura 4 è una vista prospettica di un’incudine indicata dalla freccia IV nella figura 1, - Figure 4 is a perspective view of an anvil indicated by arrow IV in Figure 1,
- la figura 5 è un dettaglio ingrandito della parte indicata dalla freccia V nella figura 4, - figure 5 is an enlarged detail of the part indicated by the arrow V in figure 4,
- la figura 6 è una vista in pianta di un tratto di nastro indicato dalla freccia VI nella figura 1, e figure 6 is a plan view of a section of tape indicated by the arrow VI in figure 1, e
- le figure 7, 8 e 9 sono dettagli ingranditi delle parti indicate dalle frecce VII, VIII e IX nella figura 6. - figures 7, 8 and 9 are enlarged details of the parts indicated by arrows VII, VIII and IX in figure 6.
Descrizione dettagliata Detailed description
Nella descrizione che segue si farà riferimento ad uno specifico apparecchio di saldatura senza per questo togliere generalità all’oggetto dell’invenzione, che può essere applicata anche su dispositivi di saldatura di altra tipologia quali ad esempio gli apparati di saldatura ad ultrasuoni descritti in EP-A1-3095589 e EP-A1-1609582 che tipicamente presentano una pluralità di incudini mobili cooperanti con uno o più sonotrodi stazionari. In the following description, reference will be made to a specific welding apparatus without thereby removing the generality of the object of the invention, which can also be applied to welding devices of other types such as for example the ultrasonic welding apparatus described in EP- A1-3095589 and EP-A1-1609582 which typically have a plurality of mobile anvils cooperating with one or more stationary sonotrodes.
Con riferimento alla figura 1, con 10 è indicato un apparecchio di saldatura per effettuare la saldatura trasversale su un nastro in movimento T avanzante in una direzione di macchina MD. L'apparecchio 10 comprende una struttura stazionaria 12 ed una struttura rotante 14 girevole rispetto alla struttura stazionaria 12 attorno ad un asse di rotazione A ortogonale alla direzione di macchina MD. L'apparecchio 10 comprende una prima ruota 16 che riceve un nastro T da saldare avanzante nella direzione di macchina MD e lo guida sulla periferia della struttura rotante 14, ed una seconda ruota 18 che riceve il nastro T saldato dalla periferia della struttura rotante 14 e lo rinvia nella direzione di macchina MD. With reference to Figure 1, the numeral 10 indicates a welding apparatus for carrying out transversal sealing on a moving belt T advancing in a machine direction MD. The apparatus 10 comprises a stationary structure 12 and a rotating structure 14 rotatable with respect to the stationary structure 12 about a rotation axis A orthogonal to the machine direction MD. The apparatus 10 comprises a first wheel 16 which receives a web T to be welded advancing in the machine direction MD and guides it on the periphery of the rotating structure 14, and a second wheel 18 which receives the web T welded from the periphery of the rotating structure 14 and sends it back to the MD machine direction.
La struttura rotante 14 porta una pluralità di unità di saldatura ad ultrasuoni 20 distanziate fra loro di una distanza costante lungo la periferia della struttura rotante 14. Nell'esempio illustrato la struttura rotante 14 porta dodici unità di saldatura 20 distanziate angolarmente fra loro di 30°. Ciascuna unità di saldatura 20 comprende un sonotrodo 22 ed un’incudine 24, disposti rispettivamente all'interno ed all'esterno rispetto ad una parete perimetrale 26 della struttura rotante 14. I sonotrodi 22 sono fissi rispetto alla struttura rotante 14 e sono situati all'interno rispetto alla parete perimetrale 26. I sonotrodi 22 sono affacciati a rispettive finestre formate nella parete perimetrale 26. Le incudini 24 sono portate da rispettivi corpi 28 mobili ciclicamente fra una posizione di disimpegno ed una posizione operativa. Nella posizione di disimpegno i corpi 28 sono spostati lateralmente rispetto al percorso del nastro T per non ostacolare il passaggio del nastro dalla prima ruota 16 alla parete perimetrale 26 della struttura rotante 14 ed il passaggio del nastro T dalla parete perimetrale 26 alla seconda ruota 18. Nella posizione operativa dei corpi 28 le incudini 24 premono il nastro T contro i rispettivi sonotrodi 22, in modo da permettere il trasferimento dell'energia di saldatura dai sonotrodi 22 al nastro T. The rotating structure 14 carries a plurality of ultrasonic welding units 20 spaced apart by a constant distance along the periphery of the rotating structure 14. In the illustrated example, the rotating structure 14 carries twelve welding units 20 angularly spaced by 30 °. . Each welding unit 20 comprises a sonotrode 22 and an anvil 24, arranged respectively inside and outside with respect to a perimeter wall 26 of the rotating structure 14. The sonotrodes 22 are fixed with respect to the rotating structure 14 and are located at the internal with respect to the perimeter wall 26. The sonotrodes 22 face respective windows formed in the perimeter wall 26. The anvils 24 are carried by respective bodies 28 cyclically movable between a disengagement position and an operative position. In the disengagement position the bodies 28 are moved laterally with respect to the path of the belt T so as not to obstruct the passage of the belt from the first wheel 16 to the perimeter wall 26 of the rotating structure 14 and the passage of the belt T from the perimeter wall 26 to the second wheel 18. In the operative position of the bodies 28 the anvils 24 press the band T against the respective sonotrodes 22, so as to allow the transfer of the welding energy from the sonotrodes 22 to the belt T.
Il movimento fra la posizione di disimpegno e la posizione operativa, e viceversa, dei corpi 28 comprende un movimento di rotazione angolare attorno a rispettivi assi radiali B ed un movimento di traslazione lineare nella direzione dei rispettivi assi radiali B. Il meccanismo che comanda il movimento dei corpi 50 fra la posizione di disimpegno e la posizione operativa, e viceversa, è descritto dettagliatamente in una contemporanea domanda di brevetto della stessa Richiedente. The movement between the disengagement position and the operative position, and vice versa, of the bodies 28 comprises an angular rotation movement around respective radial axes B and a linear translation movement in the direction of the respective radial axes B. The mechanism that controls the movement of the bodies 50 between the disengagement position and the operative position, and vice versa, is described in detail in a contemporary patent application of the same Applicant.
Con riferimento alle figure 2 e 4, ciascuna incudine 24 comprende un corpo metallico 30 avente una superficie di incudine 32 sulla quale sono formate una pluralità di aree di contatto 34, illustrate in maggiore scala nei dettagli delle figure 3 e 5. Le aree di contatto 34 sporgono dalla superficie di incudine 32 e formano aree di contatto con il telo T attraverso le quali le vibrazioni con frequenza ultrasonica generate dal sonotrodo vengono trasferite dal sonotrodo 22 all'incudine 24 attraverso il telo T. Le aree di contatto 34 formano sul telo T un pattern di saldatura uguale allo schema delle aree di contatto 34. With reference to Figures 2 and 4, each anvil 24 comprises a metal body 30 having an anvil surface 32 on which a plurality of contact areas 34 are formed, illustrated on a larger scale in the details of Figures 3 and 5. The contact areas 34 protrude from the anvil surface 32 and form areas of contact with the sheet T through which the vibrations with ultrasonic frequency generated by the sonotrode are transferred from the sonotrode 22 to the anvil 24 through the sheet T. The contact areas 34 form on the sheet T a welding pattern equal to the pattern of the contact areas 34.
Secondo la presente invenzione, ciascuna incudine 24 definisce un pattern di saldatura individuale diverso da quello delle altre incudini 24 ed univocamente correlato alla rispettiva unità di saldatura 20. In questo modo, ciascuna saldatura trasversale effettuata sul nastro T è correlata in relazione univoca all'unità di saldatura 20 che ha prodotto la stessa. Questo permette di individuare prontamente quale delle unità di saldatura 20 necessita di interventi di regolazione o di manutenzione nel caso in cui vengano individuate linee di saldatura non conformi sul nastro T. Nell'esempio illustrato nelle figure, le aree di contatto 34 di ciascuna incudine 24 sono allineate lungo almeno una schiera 36 che si estende lungo una linea di saldatura C che, nella posizione operativa dei corpi 38, si estende in direzione trasversale alla direzione longitudinale del nastro T. According to the present invention, each anvil 24 defines an individual welding pattern different from that of the other anvils 24 and uniquely correlated to the respective welding unit 20. In this way, each transverse welding carried out on the strip T is correlated in a univocal relation to the unit of welding 20 which produced the same. This makes it possible to readily identify which of the welding units 20 requires adjustment or maintenance in the event that non-compliant welding lines are identified on the belt T. In the example shown in the figures, the contact areas 34 of each anvil 24 are aligned along at least one array 36 extending along a welding line C which, in the operative position of the bodies 38, extends in a direction transverse to the longitudinal direction of the belt T.
Nella forma di attuazione descritta ciascuna incudine 24 ha quattro schiere 36 di aree di contatto 34 parallele fra loro, raggruppate in due gruppi distanziati fra loro, con ciascun gruppo formato da due schiere 36 adiacenti fra loro. Preferibilmente, le due schiere 36 di ciascun gruppo hanno le rispettive aree di contatto 34 sfasate fra loro nella direzione delle rispettive linee di saldatura C. tipicamente le incudini 24 possono avere gruppi di schiere 36 di aree di contatto 34 con un numero N qualsiasi di schiere 36 che può variare da un minimo di 1 ad un massimo di 6 schiere per ciascun gruppo. Tipicamente in un’incudine 24 le schiere 36 di ciascun gruppo sono parallele tra di loro, mentre i gruppi sono tra di loro divergenti. In the embodiment described each anvil 24 has four arrays 36 of contact areas 34 parallel to each other, grouped into two groups spaced apart, with each group formed by two arrays 36 adjacent to each other. Preferably, the two arrays 36 of each group have their respective contact areas 34 offset from each other in the direction of the respective welding lines C. typically the anvils 24 can have groups of arrays 36 of contact areas 34 with any number N of arrays. 36 which can vary from a minimum of 1 to a maximum of 6 rows for each group. Typically in an anvil 24 the arrays 36 of each group are parallel to each other, while the groups are divergent from each other.
Nella forma di realizzazione illustrata nelle figure, almeno una schiera 36 di ciascuna incudine 24 ha una pluralità di aree di contatto regolari 34 uguali fra loro e disposte in modo regolare lungo la rispettiva schiera 36 ed almeno due aree di contatto irregolari 34’ diverse dalle aree di contatto regolari 34. Nell'esempio illustrato, le aree di contatto regolari 34 hanno la forma di rettangoli sottili trasversali rispetto alla rispettiva linea di saldatura C e distanziati di un passo costante nella direzione della rispettiva linea di saldatura C. Le aree di contatto irregolari 34’ hanno la forma di rettangoli sottili aventi uno spessore nella direzione della rispettiva linea di saldatura C diverso dallo spessore delle aree di contatto regolari 34. Ad esempio, le aree di contatto irregolari 34’ possono avere uno spessore sostanzialmente doppio delle aree di contatto regolari 34. In the embodiment illustrated in the figures, at least one array 36 of each anvil 24 has a plurality of regular contact areas 34 equal to each other and arranged in a regular manner along the respective array 36 and at least two irregular contact areas 34 'different from the areas regular contact areas 34. In the illustrated example, the regular contact areas 34 are in the form of thin rectangles transverse to the respective weld line C and spaced by a constant step in the direction of the respective weld line C. The irregular contact areas 34 'have the form of thin rectangles having a thickness in the direction of the respective weld line C different from the thickness of the regular contact areas 34. For example, the irregular contact areas 34' can have a substantially double thickness of the regular contact areas 34.
Fra le due aree di contatto irregolari 34’ è disposto un numero i di aree di contatto regolari 34 variabile da 1 a n, dove n è il numero di unità di saldatura 20 dell'apparecchio 10. Il numero i di aree di contatto regolari 34 compreso fra due aree di contatto irregolari 34’ di una schiera 36 è univoco per ciascuna incudine 24. Le unità di saldatura 20 dell'apparecchio 10 sono numerate in modo sequenziale da 1 a n. Between the two irregular contact areas 34 'there is a number i of regular contact areas 34 varying from 1 to n, where n is the number of welding units 20 of the apparatus 10. The number i of regular contact areas 34 inclusive between two irregular contact areas 34 'of an array 36 is unique for each anvil 24. The welding units 20 of the apparatus 10 are sequentially numbered from 1 to n.
L'incudine 24 di ciascuna unità di saldatura 20 ha un numero i di aree di contatto regolari 34 comprese fra due aree di contatto irregolari 34’ corrispondente al numero indicativo della rispettiva unità di saldatura 20. Ad esempio, nelle figure 2 e 3 è illustrata l’incudine 24 dell'unità di saldatura 20 identificata con il numero 1. Almeno una schiera 36 dell’incudine 24 ha due aree di contatto irregolari 34’ fra le quali è disposta una area di contatto regolare 34. Nelle figure 4 e 5 è illustrata l’incudine 24 dell'unità di saldatura 20 identificata dal numero 10. In questo caso, almeno una schiera 36 ha due aree di contatto irregolari 34’ fra le quali sono disposte dieci aree di contatto regolari 34. The anvil 24 of each welding unit 20 has a number of regular contact areas 34 comprised between two irregular contact areas 34 'corresponding to the indicative number of the respective welding unit 20. For example, Figures 2 and 3 show the anvil 24 of the welding unit 20 identified with the number 1. At least one array 36 of the anvil 24 has two irregular contact areas 34 'between which a regular contact area 34 is arranged. Figures 4 and 5 show illustrated the anvil 24 of the welding unit 20 identified by the number 10. In this case, at least one array 36 has two irregular contact areas 34 'between which ten regular contact areas 34 are arranged.
Nella figura 6 è illustrato un tratto del nastro T all'uscita dell'apparecchio di saldatura 10. Sul nastro T sono formate una pluralità di linee di saldatura 40 estendentisi lungo rispettive direzioni C trasversali rispetto alla direzione di macchina MD. Le figure 7, 8 e 9 sono dettagli ingranditi che mostrano le linee di saldatura 40. Ciascuna linea di saldatura 40 è formata da un pattern di saldatura costituito da saldature individuali 42 allineate lungo rispettive schiere trasversali 44. In almeno una schiera trasversale 44 di ciascuna saldatura 40 sono individuabili aree di saldatura irregolari 42’ aventi, ad esempio, una larghezza nella direzione trasversale C maggiore della larghezza delle aree di saldatura regolari 42. Da un'ispezione visuale delle saldature trasversali 40 è possibile individuare in modo univoco quale sia l'unità di saldatura 20 che ha effettuato ciascuna saldatura trasversale 40. In particolare, il numero delle aree di saldatura regolari 42 compreso fra due aree di saldatura irregolari 42’ individua in modo univoco il numero identificativo dell'unità di saldatura 20 dell'apparecchio 10. Quindi, nel caso in cui vengano individuate sul nastro T saldature 40 difettose, è possibile identificare in modo univoco l'unità di saldatura 20 dell'apparecchio 10 che ha prodotto tali saldature. Figure 6 illustrates a portion of the strip T at the outlet of the welding apparatus 10. A plurality of welding lines 40 extending along respective directions C transverse to the machine direction MD are formed on the strip T. Figures 7, 8 and 9 are enlarged details showing the weld lines 40. Each weld line 40 is formed by a weld pattern consisting of individual welds 42 aligned along respective transverse arrays 44. In at least one transverse array 44 of each weld 40, irregular weld areas 42 'can be identified having, for example, a width in the transverse direction C greater than the width of the regular weld areas 42. From a visual inspection of the transverse welds 40 it is possible to uniquely identify which is the welding unit 20 which has carried out each transverse welding 40. In particular, the number of regular welding areas 42 comprised between two irregular welding areas 42 'uniquely identifies the identification number of the welding unit 20 of the apparatus 10. Therefore, in the event that defective welds 40 are identified on the belt T, it is possible to uniquely identify the one welding unit 20 of the apparatus 10 which produced such welds.
Il fatto di formare aree di saldatura irregolari 42’ con una larghezza diversa rispetto a quella delle aree di saldatura regolari 42 permette di individuare rapidamente l'unità di saldatura 20 che ha effettuato la saldatura senza tuttavia compromettere la qualità della saldatura né sotto l'aspetto visivo né sotto l'aspetto della resistenza della saldatura. Le variazioni di dimensioni fra le aree di contatto regolari 34 e le aree di contatto irregolari 34’ sono tali da non avere impatti negativi per quanto riguarda gli aspetti tecnologici della saldatura ad ultrasuoni. In particolare, non vengono create discontinuità nella trasmissione di energia fra il sonotrodo e l’incudine. The fact of forming irregular weld areas 42 'with a different width than that of the regular weld areas 42 allows to quickly identify the welding unit 20 which carried out the weld without however compromising the quality of the weld or from the aspect visually or from the point of view of the strength of the weld. The size variations between the regular contact areas 34 and the irregular contact areas 34 'are such as not to have negative impacts as regards the technological aspects of ultrasonic welding. In particular, no discontinuities are created in the transmission of energy between the sonotrode and the anvil.
Le aree di contatto irregolari 34’ possono differire rispetto alle aree di contatto regolari 34 per quanto riguarda la forma, le dimensioni o la posizione. Ciò che rileva è che sul telo sia possibile individuare visivamente zone di discontinuità nella distribuzione delle aree di saldatura 42. The irregular contact areas 34 'may differ from the regular contact areas 34 in terms of shape, size or position. What is important is that on the sheet it is possible to visually identify areas of discontinuity in the distribution of the welding areas 42.
Naturalmente, fermo restando il principio dell'invenzione, i particolari di costruzione e le forme di realizzazione potranno essere ampiamente variati rispetto a quanto descritto ed illustrato senza per questo uscire dall'ambito dell'invenzione così come definito dalle rivendicazioni che seguono. Naturally, the principle of the invention remaining the same, the details of construction and the embodiments may be widely varied with respect to those described and illustrated without thereby departing from the scope of the invention as defined by the following claims.
Claims (5)
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| IT102017000009680A IT201700009680A1 (en) | 2017-01-30 | 2017-01-30 | APPARATUS FOR THE TRANSVERSAL WELDING OF A MOVING TAPE |
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| IT102017000009680A IT201700009680A1 (en) | 2017-01-30 | 2017-01-30 | APPARATUS FOR THE TRANSVERSAL WELDING OF A MOVING TAPE |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4091800A1 (en) * | 2021-05-21 | 2022-11-23 | GREIF-VELOX Maschinenfabrik GmbH | Device for filling flexible containers |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011099297A1 (en) * | 2010-02-10 | 2011-08-18 | Unicharm Corporation | Disposable wearing articles and a seam welder used to form the same |
| JP2014036896A (en) * | 2013-11-25 | 2014-02-27 | Uni Charm Corp | Joining device used for forming disposable wearing article |
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2017
- 2017-01-30 IT IT102017000009680A patent/IT201700009680A1/en unknown
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011099297A1 (en) * | 2010-02-10 | 2011-08-18 | Unicharm Corporation | Disposable wearing articles and a seam welder used to form the same |
| JP2014036896A (en) * | 2013-11-25 | 2014-02-27 | Uni Charm Corp | Joining device used for forming disposable wearing article |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP4091800A1 (en) * | 2021-05-21 | 2022-11-23 | GREIF-VELOX Maschinenfabrik GmbH | Device for filling flexible containers |
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