FR2573002A1 - Process and device for the transverse welding of a tubular plastic sleeve - Google Patents
Process and device for the transverse welding of a tubular plastic sleeve Download PDFInfo
- Publication number
- FR2573002A1 FR2573002A1 FR8417231A FR8417231A FR2573002A1 FR 2573002 A1 FR2573002 A1 FR 2573002A1 FR 8417231 A FR8417231 A FR 8417231A FR 8417231 A FR8417231 A FR 8417231A FR 2573002 A1 FR2573002 A1 FR 2573002A1
- Authority
- FR
- France
- Prior art keywords
- sheath
- insert
- bellows
- parts
- transverse
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- B29C66/004—Preventing sticking together, e.g. of some areas 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
- 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
-
- 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
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/431—Joining the articles to themselves
- B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
-
- 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
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
- B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
-
- 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
- B29C66/832—Reciprocating joining or pressing tools
- B29C66/8322—Joining or pressing tools reciprocating along one axis
- B29C66/83221—Joining or pressing tools reciprocating along one axis cooperating reciprocating tools, each tool reciprocating along one axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
- B65D31/10—Bags or like containers made of paper and having structural provision for thickness of contents with gusseted sides
-
- 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
- B29C66/346—Making joints having variable thicknesses in the joint area, e.g. by using jaws having an adapted configuration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31B70/00—Making flexible containers, e.g. envelopes or bags
- B31B70/60—Uniting opposed surfaces or edges; Taping
- B31B70/64—Uniting opposed surfaces or edges; Taping by applying heat or pressure
Abstract
Description
Procédé et dispositif de soudage transversal d'une gaine tubulaire-tx a i ++
L'invention concerne un procédé de soudage trans
versal d'une gaine tubulaire à soufflets en matière plastique
thermosoudable, un dispositif pour la mise en oeuvre du pro
cédé et la g#aine réalisée par le procédé.Method and device for transverse welding of a tubular sheath-tx ai ++
The invention relates to a trans welding process.
versal of a tubular sheath with plastic bellows
heat sealable, a device for the implementation of the pro
yielded and the grain produced by the process.
On connaît déjà, notamment dans le dowaine de l'em
ballage, des procédés et dispositifs de soudage transversal
d'une gaine tubulaire à soufflets en matière plastique therro
soudable. Ce procédé et ce dispositif visent à réaliser sur
la totalité d'une zone transversale de la gaine une soudure.We already know, especially in the em dowaine
balling, transverse welding methods and devices
a tubular sheath with plastic bellows therro
weldable. This process and this device aim to achieve on
the whole of a transverse zone of the sheath a weld.
Celle-ci peut être combinée avec une coupe immédiaterrent
voisine.This can be combined with an immediate cut
neighbor.
Avec le procédé et le dispositif connus, les bords
extérieurs du soufflet sont soudés l'un à l'autre, dans la
zone transversale de soudage. Cette disposition peut être
gênante dans certaines applications du fait que l'ouverture
de la gaine nécessite l'emploi d'un écarteur et que celui-ci
doit donc être escamoté au moment d'une soudure, puis réin
troduit dans le soufflet après celle-ci.With the known method and device, the edges
bellows are welded to each other, in the
transverse welding area. This provision can be
troublesome in some applications because the opening
of the sheath requires the use of a retractor and that this
must therefore be retracted at the time of a weld, then reinstated
troduit in the bellows after this one.
L'invention vise donc à remédier à ces inconvénients
et, à cet effet, elle propose un procédé et un dispositif
pour réaliser le soudage transversal d'une gaine tubulaire
à soufflets en matière plastique thermosoudable telle que
dans la zone transversale de soudage, les bords extérieurs
du soufflet ne soient pas soudés ensemble, de sorte que le
soufflet est accessible de l'extérieur sur toute la longueur
de la gaine, y compris à l'endroit d'une zone transversale de soudage. A cet effet, le procédé selon l'invention est caractérisé par le fait qu'on réalise dans la zone transversale de soudage et au droit d'un soufflet un tronçon sandwich comportant deux parties soudées en regard séparée s par une partie d'accès.The invention therefore aims to remedy these drawbacks
and, for this purpose, it proposes a method and a device
to carry out transverse welding of a tubular sheath
with heat-sealable plastic bellows such as
in the transverse welding area, the outer edges
of the bellows are not welded together, so that the
bellows is accessible from the outside over the entire length
of the sheath, including at the location of a transverse welding zone. To this end, the method according to the invention is characterized in that a sandwich section is formed in the transverse welding zone and in line with a bellows comprising two welded facing parts separated by an access part.
Un dispositif pour la mise en oeuvre du procédé comporte des moyens de séparation propres à séparer l'une de l'autre les deux parties de gaine en regard appartenant à deux paires distinctes de parties de gaine placées en regard. A device for implementing the method comprises separation means suitable for separating from one another the two facing sheath parts belonging to two distinct pairs of sheath parts placed opposite.
Une gaine obtenue par la mise en oeuvre du procédé ou par l'emploi du procédé présente donc une soudure transversale, totale ou partielle, les bords extérieurs de chaque soufflet n'étant pas soudés l'un à l'autre. A sheath obtained by the implementation of the method or by the use of the method therefore has a transverse weld, total or partial, the outer edges of each bellows not being welded to one another.
De tels procédés et dispositifs sont applicables à des machines d'emballage. Ils permettent également de réaliser une gaine comportant, dans la zone transversale de soudage, des angles soudés (entre une ame d'un soufflet et le voile principal de la gaine), formant un rétrécissement de maintien de cette gaine sur une charge. Such methods and devices are applicable to packaging machines. They also make it possible to produce a sheath comprising, in the transverse welding zone, welded angles (between a core of a bellows and the main web of the sheath), forming a shrinkage in maintaining this sheath on a load.
Les autres caractéristiques de l'invention résulteront de la description qui suivra en référence aux dessins annexés dans lesquels:
la figure 1 est une vue schématique, en perspective partielle, illustrant une gaine tubulaire à soufflets utilisée dans l'invention;
les figures 2 à 4 sont trois vues schématiques, en section droite transversale, illustrant trois variantes possibles de gaine obtenue par la mise en oeuvre du procédé, les coupes étant faites au droit d'une zone transversale de soudage;
la figure 5 est une vue schématique, en coupe transversale, illustrant le procédé selon l'invention;
la figure 6 est une vue schématique, en perspective, illustrant un dispositif selon l'invention;
la figure 7 est une vue schématique, en perspective, illustrant une gaine selon l'invention. The other characteristics of the invention will result from the description which follows with reference to the accompanying drawings in which:
Figure 1 is a schematic view, in partial perspective, illustrating a tubular sheath with bellows used in the invention;
Figures 2 to 4 are three schematic views, in cross section, illustrating three possible variations of sheath obtained by the implementation of the method, the cuts being made in line with a transverse welding area;
Figure 5 is a schematic view, in cross section, illustrating the method according to the invention;
Figure 6 is a schematic perspective view illustrating a device according to the invention;
Figure 7 is a schematic perspective view illustrating a sheath according to the invention.
Selon l'invention, on utilise une gaine tubulaire 1 (figure 1) comprenant deux voiles principaux 2 réunis l'un à l'autre par leursbordsextérieurs 3 pardeux soufflets 4 comportant chacun deux âmes 5 réunies l'une à l'autre par leur bord interne 6. Un voile principal 2 comporte une partie médiane 7, entre les soufflets 4 et deux parties extérieures 8 terminées par les bords 3 communs avec ceux des âmes 5. According to the invention, a tubular sheath 1 is used (FIG. 1) comprising two main webs 2 joined to each other by their outer edges 3 pardeux bellows 4 each comprising two webs 5 joined to each other by their edge internal 6. A main web 2 has a middle part 7, between the bellows 4 and two external parts 8 terminated by the edges 3 common with those of the cores 5.
Une telle gaine 1 lorsqu'elle est inutilisée est pliée à plat, les soufflets 4 étant aplatis et les voiles 2 étant appliqués l'un contre l'autre #et, par exemple, enroulés sur une bobine. Such a sheath 1 when it is not used is folded flat, the bellows 4 being flattened and the webs 2 being applied one against the other # and, for example, wound on a reel.
La gaine 1 selon l'invention est réalisée en matière plastique thermosoudable. The sheath 1 according to the invention is made of heat-sealable plastic.
La gaine 1 s'étend le long d'un axe longitudinal et on entend par zone transversale 9 de la gaine 1, la zone définie par l'intersection avec un plan P perpendiculaire a l'axe longitudinal de la gaine (figure 1), c'est-à-dire une section droite transversale de la gaine. The sheath 1 extends along a longitudinal axis and the transverse zone 9 of the sheath 1 is understood to mean the zone defined by the intersection with a plane P perpendicular to the longitudinal axis of the sheath (FIG. 1), that is to say a cross section of the sheath.
Selon l'invention, on réalise un soudage transversal de la gaine 1 et, à cet effet, on applique l'une contre l'autre au moins deux parties de gaine distinctes pl et p2 placées en regard et appartenant a une même zone transversale 9, et on chauffe les parties de gaine pi, p2, ce qui permet de les solidariser en une partie unique soudée p3. According to the invention, a transverse welding of the sheath 1 is carried out and, for this purpose, at least two separate sheath parts pl and p2 placed opposite each other and belonging to the same transverse area are applied against each other 9 , and the sheath parts pi, p2 are heated, which makes it possible to join them in a single welded part p3.
Selon l'invention, dans la zone transversale 9 et au droit d'un soufflet 4, on réalise un tronçon sandwich 10 comportant deux parties soudées p3 et p' 3, situées en regard l'une de l'autre et séparées l'une de l'autre par une partie d'accès 11. According to the invention, in the transverse zone 9 and in line with a bellows 4, a sandwich section 10 is produced comprising two welded parts p3 and p '3, located opposite one another and separated one on the other by an access part 11.
Plus précisément, on réalise le tronçon sandwich 10 attenant aux bords extérieurs 3, de sorte que la partie d'acces 11 soit ouverte et accessible de I'exterieur de la gaine, ce qui permet notamment, comme on l'a déjà indiqué, de maintenir dans le soufflet un écarteur, et ceci v compris dans une zone transversale 9. More specifically, the sandwich section 10 is made adjoining the outer edges 3, so that the access portion 11 is open and accessible from the outside of the sheath, which allows in particular, as already indicated, to maintain a spacer in the bellows, and this included in a transverse zone 9.
Dans -une première variante illustrée par la figure 2, le tronçon sandwich 10 s'étend sur la totalité du soufflet, dans la zone transversale 9. Gela signifie que la première âme 5 d'un soufflet 4 est soudée au voile 2 attenant et, de même, pour la seconde âme 5 et le second voile 2 attenant, les deux rames 5 n'étant pas soudées l'une avec l'autre. In a first variant illustrated by FIG. 2, the sandwich section 10 extends over the entire bellows, in the transverse zone 9. This means that the first core 5 of a bellows 4 is welded to the adjoining web 2 and, similarly, for the second core 5 and the second adjoining web 2, the two oars 5 not being welded to each other.
Dans une deuxième variante illustrée par la figure 3, le tronçon sandwich 10 est réalisé sur une partie du soufflet, plus précisément la partie extérieure Dans ce cas, les deux ames 5 d'un soufflet 4 sont soudées l'une à l'autre ainsi qu'aux voiles 2 au voisinage du bord interne 6. In a second variant illustrated by FIG. 3, the sandwich section 10 is produced on a part of the bellows, more specifically the external part. In this case, the two cores 5 of a bellows 4 are welded to each other as well. only to the sails 2 in the vicinity of the internal edge 6.
Dans les deux premières variantes décrites, on applique l'une contre l'autre les parties de gaine pl et p2 constituant la totalité de la zone transversale, de sorte que d'un bord extérieur 3 au bord extérieur -3 opposé, la totalité de la gaine est soudée, à llexception naturellement des parties d'accès 11. In the first two variants described, the sheath parts pl and p2 constituting the entire transverse area are applied against each other, so that from one outer edge 3 to the opposite outer edge -3, all of the sheath is welded, except of course for the access parts 11.
Sur la-figure 4 est illustrée une troisième variante dans laquelle on applique l'une contre 11 autre les parties de gaine pl et p2 constituant une partie seulement de la zone transversale 9 en constituant un tronçon transversal soudé 12 et un tronçon transversal non soudé 13. Dans ce cas, le tronçon transversal soudé 12 est attenant aux bords extérieurs 3et le tronçon non soudé 13 est situé dans la partie médiane 7. Cette variante permet de réaliser une gaine tubulaire dont seuls les coins (raccordement d'un soufflet aux voiles) sont soudés, ce qui permet de réaliser un arrêt de blocage de la gaine tubulaire une fois ouverte sur une charge. In FIG. 4 is illustrated a third variant in which one applies against one another the sheath parts pl and p2 constituting only one part of the transverse zone 9 by constituting a welded transverse section 12 and an unwelded transverse section 13 In this case, the welded transverse section 12 is adjacent to the outer edges 3 and the non-welded section 13 is located in the middle part 7. This variant makes it possible to produce a tubular sheath of which only the corners (connection of a bellows to the sails) are welded, which allows a blocking stop of the tubular sheath once opened on a load.
Sur la figure 5, on a illustré par A C l'application et le chauffage des parties pl et p2, dans le cas de la première variante illustréepar la fulgure 2. In FIG. 5, there is illustrated by A C the application and the heating of the parts p1 and p2, in the case of the first variant illustrated by the figure 2.
Pour réaliser un tronçon sandwich 10, on place entre les deux paires de parties de gaine appliquées l'une contre l'autre pl, p2 d'une part, p'1, p'2 d'autre part, un insert 14 propre à séparer l1une de l'autre les deux parties de gaine en regard appartenant aux deux paires distinctes. To produce a sandwich section 10, an insert 14 suitable for placing between the two pairs of sheath parts applied one against the other pl, p2 on the one hand, p'1, p'2 on the other hand separate the two facing sheath parts belonging to the two separate pairs from one another.
Si donc, par exemple, la partie pl est constituée par la partie extérieure 8 d'un voile 2, et la partie p2 par l'âme 5 qui lui est attenante, l'insert 14 sera propre à séparer l'une de l'autre les deux âmes 5 du soufflet 4 qui constituent les deux parties de gaine en regard p2, p'2 appartenant aux deux paires pi, p2, p'l, p'2 devant être respectivement soudées pour former les parties p3 et p'3. If therefore, for example, the part pl is constituted by the external part 8 of a web 2, and the part p2 by the core 5 which is attached thereto, the insert 14 will be able to separate one of the other the two cores 5 of the bellows 4 which constitute the two facing sheath parts p2, p'2 belonging to the two pairs pi, p2, p'l, p'2 having to be welded respectively to form the parts p3 and p'3 .
On utilise un insert 14 en matériau non thermosoudable avec la matière plastique constituant la gaine. An insert 14 made of non-heat-sealable material is used with the plastic material constituting the sheath.
Par exemple, l'insert 14 peut être un métal ou à base de métal. Préférentiellement, l'insert est conducteur de la chaleur afin de ne pas affecter la transmission de la chaleur permettant le soudage. Préférentiellement, encore, l'insert est non compressible lorsqu'il est soumis à la pression d'application des parties pl et p2 l'une contre l'autre. Préférentiellement encore,l'insert 14 est mince, ceci afin de ne pas affecter le procédé de soudage transversal en soi.For example, the insert 14 may be a metal or based on metal. Preferably, the insert is a heat conductor so as not to affect the heat transmission allowing the welding. Preferably, again, the insert is non-compressible when it is subjected to the pressure of application of the parts p1 and p2 against each other. Also preferably, the insert 14 is thin, this in order not to affect the transverse welding process per se.
Enfin, préférentiellement, l'insert 14 saille des bords extérieurs 3, ceci afin d'éviter que même de façon inopinée, les bords extérieurs 3 en regard ne viennent au contact l'un de l'autre et puissent être soudés ensemble. Finally, preferably, the insert 14 protrudes from the outer edges 3, this in order to avoid that, even unexpectedly, the facing outer edges 3 come into contact with one another and can be welded together.
Dans une première forme d'exécution de l'invention plus spécialement illustrée par la figure 6, on utilise un insert 14 distinct de la gaine 1. On introduit cet insert 14 par l'ouverture du soufflet 4, à l'endroit de la zone transversale.Par exemple, la gaine 1 glisse sur l'insert 14 fixe et on réalise le soudage transversal au droit de l'insert 14. In a first embodiment of the invention more particularly illustrated in FIG. 6, an insert 14 distinct from the sheath 1 is used. This insert 14 is introduced by the opening of the bellows 4, at the location of the zone For example, the sheath 1 slides over the fixed insert 14 and the transverse welding is carried out in line with the insert 14.
Dans une seconde forme d'exécution plus spécialement illustrée par la figure 7, on utilise un insert 14 faisant partie intégrante de la gaine, sur au moins une âme 5 du soufflet 4, attenant à son bord extérieur 3. In a second embodiment more particularly illustrated in FIG. 7, an insert 14 forming an integral part of the sheath is used, on at least one core 5 of the bellows 4, adjoining its outer edge 3.
Dans l'une comme dans l'autre forme d'exécution, l'insert 14 peut donc se présenter sous la forme d'une bande longitudinale s'étendant parallèlement à l'axe de la gaine 1. In one as in the other embodiment, the insert 14 can therefore be in the form of a longitudinal strip extending parallel to the axis of the sheath 1.
L'invention concerne donc également une gaine tubulaire obtenue par la mise en oeuvre du procédé qui vient d'être décrit. Cette gaine est telle que dans la zone transversale de soudage 9 elle comporte, d'une part, deux parties soudées p3, p'3, en regard, résultant chacune du soudage des parties extérieures 8 d'un voile principal 2 - soit pl - et d'une âme 5 - soit p2 - adjacente à un bord 2 et, d'autre part, entre les parties soudées p3, p'3, une partie d'accès 11, ouverte à l'extérieur laissant libres et non soudés l'un avec l'autre les deux bords extérieurs 3. The invention therefore also relates to a tubular sheath obtained by the implementation of the method which has just been described. This sheath is such that in the transverse welding zone 9 it comprises, on the one hand, two welded parts p3, p'3, facing each other, each resulting from the welding of the external parts 8 of a main web 2 - either pl - and a core 5 - either p2 - adjacent to an edge 2 and, on the other hand, between the welded parts p3, p'3, an access part 11, open to the outside leaving free and not welded l with each other the two outer edges 3.
Dans le cas de la seconde forme d'exécution illustrée par la figure 7, la gaine tubulaire comporte un insert 14 qui en fait partie intégrante. Celui-ci peut être localisé sur au moins une âme 5, attenant à son bord 3 et être cons titué par une bande en un matériau non thermosoudable déposé à l'extérieur de la gaine. In the case of the second embodiment illustrated in FIG. 7, the tubular sheath comprises an insert 14 which forms an integral part of it. This can be located on at least one core 5, adjoining its edge 3 and be constituted by a strip of non-heat-sealable material deposited outside the sheath.
Un dispositif selon l'invention, plus spécialement pour la mise en oeuvre de la seconde forme d'exécution précédemment décrite est illustré par la figure 6 et comporte des moyens de pressage 15, pour appliquer l'une contre l'autre les parties pl et p2 et des moyens de chauffage associés aux moyens de pressage 15. Les moyens de pressage 15 et les moyens de chauffage associés sont connus en soi dans leur structure générale et se présentent, par exemple, sous la forme de deux mors mobiles l'un par rapport à l'autre comportant des moyens de chauffage électrique. A device according to the invention, more specifically for the implementation of the second embodiment described above is illustrated by FIG. 6 and comprises pressing means 15, for applying the parts pl and against each other p2 and heating means associated with the pressing means 15. The pressing means 15 and the associated heating means are known per se in their general structure and are, for example, in the form of two movable jaws, one by compared to the other comprising electric heating means.
Un tel dispositif comporte des moyens de séparation 14 propres à séparer l'une de l'autre les deux parties de gaine p2, p'2 en regard appartenant à deux paires distinctes pl, p2, p'l, p'2. Les moyens de séparation 14 sont constitués par l'insert tel qu'il a été précédemment décrit, par exemple, constitué par une bande fixe, rigide, plane, placée entre les deux mors de pressage et de chauffage, le soufflet 4 de la gaine venant se loger de part et d'autre de l'insert 14. Préférentiellement, les mors comportent au droit de l'insert 14 des découpes 16 permettant d'assurer un pressage correct de la gaine 1 malgré l'épaisseur de l'insert 14. Such a device comprises separation means 14 suitable for separating from one another the two sheath parts p2, p'2 opposite belonging to two distinct pairs pl, p2, p'l, p'2. The separation means 14 are constituted by the insert as previously described, for example, constituted by a fixed, rigid, flat strip, placed between the two pressing and heating jaws, the bellows 4 of the sheath coming to be housed on either side of the insert 14. Preferably, the jaws comprise, in line with the insert 14, cutouts 16 making it possible to ensure correct pressing of the sheath 1 despite the thickness of the insert 14 .
Claims (23)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8417231A FR2573002B1 (en) | 1984-11-12 | 1984-11-12 | METHOD AND DEVICE FOR TRANSVERSE WELDING OF A TUBULAR SHEATH IN PLASTIC MATERIAL |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8417231A FR2573002B1 (en) | 1984-11-12 | 1984-11-12 | METHOD AND DEVICE FOR TRANSVERSE WELDING OF A TUBULAR SHEATH IN PLASTIC MATERIAL |
Publications (2)
Publication Number | Publication Date |
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FR2573002A1 true FR2573002A1 (en) | 1986-05-16 |
FR2573002B1 FR2573002B1 (en) | 1990-02-16 |
Family
ID=9309507
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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FR8417231A Expired - Fee Related FR2573002B1 (en) | 1984-11-12 | 1984-11-12 | METHOD AND DEVICE FOR TRANSVERSE WELDING OF A TUBULAR SHEATH IN PLASTIC MATERIAL |
Country Status (1)
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FR (1) | FR2573002B1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0397099A1 (en) * | 1989-05-10 | 1990-11-14 | B.L. MACCHINE AUTOMATICHE S.p.A. | Method and apparatus for manufacturing sacks |
NL1021401C2 (en) * | 2002-09-05 | 2004-03-08 | Smq Group B V | Foldable bag. |
Citations (7)
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GB951437A (en) * | 1959-09-09 | 1964-03-04 | Dale Products Plastics Ltd | Improvements in and relating to plastic bags and the manufacture thereof |
FR1452549A (en) * | 1964-11-05 | 1966-09-09 | Automatic Bag Corp | Bag |
US3570375A (en) * | 1966-11-25 | 1971-03-16 | Bemis Co Inc | Methods of manufacturing plastic bags |
US3851814A (en) * | 1972-02-28 | 1974-12-03 | Arvey Corp | Gusseted article |
FR2367672A1 (en) * | 1976-10-14 | 1978-05-12 | Wavin Bv | METHOD OF MANUFACTURING A STRIP OF PLASTIC BAGS |
FR2373458A1 (en) * | 1976-12-08 | 1978-07-07 | Roland Emballages | SEALED PACKAGING BAG AND ITS MANUFACTURING PROCESS |
AU529320B2 (en) * | 1979-10-19 | 1983-06-02 | Technosearch Pty. Limited | Liner |
-
1984
- 1984-11-12 FR FR8417231A patent/FR2573002B1/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
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GB951437A (en) * | 1959-09-09 | 1964-03-04 | Dale Products Plastics Ltd | Improvements in and relating to plastic bags and the manufacture thereof |
FR1452549A (en) * | 1964-11-05 | 1966-09-09 | Automatic Bag Corp | Bag |
US3570375A (en) * | 1966-11-25 | 1971-03-16 | Bemis Co Inc | Methods of manufacturing plastic bags |
US3851814A (en) * | 1972-02-28 | 1974-12-03 | Arvey Corp | Gusseted article |
FR2367672A1 (en) * | 1976-10-14 | 1978-05-12 | Wavin Bv | METHOD OF MANUFACTURING A STRIP OF PLASTIC BAGS |
FR2373458A1 (en) * | 1976-12-08 | 1978-07-07 | Roland Emballages | SEALED PACKAGING BAG AND ITS MANUFACTURING PROCESS |
AU529320B2 (en) * | 1979-10-19 | 1983-06-02 | Technosearch Pty. Limited | Liner |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0397099A1 (en) * | 1989-05-10 | 1990-11-14 | B.L. MACCHINE AUTOMATICHE S.p.A. | Method and apparatus for manufacturing sacks |
NL1021401C2 (en) * | 2002-09-05 | 2004-03-08 | Smq Group B V | Foldable bag. |
Also Published As
Publication number | Publication date |
---|---|
FR2573002B1 (en) | 1990-02-16 |
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