FR2490542A1 - PROCESS FOR THE MANUFACTURE OF AN INSERTED BOTTOM TUBE - Google Patents
PROCESS FOR THE MANUFACTURE OF AN INSERTED BOTTOM TUBE Download PDFInfo
- Publication number
- FR2490542A1 FR2490542A1 FR8020866A FR8020866A FR2490542A1 FR 2490542 A1 FR2490542 A1 FR 2490542A1 FR 8020866 A FR8020866 A FR 8020866A FR 8020866 A FR8020866 A FR 8020866A FR 2490542 A1 FR2490542 A1 FR 2490542A1
- Authority
- FR
- France
- Prior art keywords
- sheath
- pellet
- periphery
- patch
- tube
- 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.)
- Granted
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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
- 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
- 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
- B29C65/20—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools with direct contact, e.g. using "mirror"
-
- 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
- B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
- B29C65/567—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits using a tamping or a swaging operation, i.e. at least partially deforming the edge or the rim of a first part to be joined to clamp a second part to be joined
- B29C65/568—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits using a tamping or a swaging operation, i.e. at least partially deforming the edge or the rim of a first part to be joined to clamp a second part to be joined using a swaging operation, i.e. totally deforming the edge or the rim of a first part to be joined to clamp a second part 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
- B29C65/78—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
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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
-
- 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
- B29C66/13—Single flanged joints; Fin-type joints; Single hem joints; Edge joints; Interpenetrating fingered joints; Other specific particular designs of joint cross-sections not provided for in groups B29C66/11 - B29C66/12
- B29C66/131—Single flanged joints, i.e. one of the parts to be joined being rigid and flanged in the joint area
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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
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/53—Joining single elements to tubular articles, hollow articles or bars
- B29C66/534—Joining single elements to open ends of tubular or hollow articles or to the ends of bars
- B29C66/5346—Joining single elements to open ends of tubular or hollow articles or to the ends of bars said single elements being substantially flat
-
- 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
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/61—Joining from or joining on the inside
- B29C66/612—Making circumferential joints
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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
- B29C66/80—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
- B29C66/81427—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 comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
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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
- B29C66/80—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
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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
- B29C66/70—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
- B29C66/71—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 composition of the plastics material 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
- B29C66/80—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
- B29C66/81411—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 characterised by its cross-section, e.g. transversal or longitudinal, being non-flat
- B29C66/81415—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 characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled
- B29C66/81419—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 characterised by its cross-section, e.g. transversal or longitudinal, being non-flat being bevelled and flat
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping Of Tube Ends By Bending Or Straightening (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
Description
L'invention est relative à un procédé de fabrication d'un tube
à fond rapporté en matière thermo-plastique.The invention relates to a method of manufacturing a tube
fully attached in thermoplastic material.
Il est particulièrement avantageux de réaliser des tubes en
matière thermo-fusible à partir de gaines tubulaires de section appro
priée, que l'on découpe en longueursdéterminéeset auxquels on adjoint
ensuite un fond. En effet, la gaine tubulaire peut être obtenue d'une
manière très simple et peu conteuse par extrusion. Ce mode de fabrica
tion est en particulier plus simple et plus économique qu'une fabrication
par moulage.It is particularly advantageous to produce tubes in
hot-melt material from tubular sheaths of appropriate cross-section
required, which we cut into predetermined lengths and to which we add
then a background. Indeed, the tubular sheath can be obtained from a
very simple and inexpensive way by extrusion. This mode of fabrica
tion is in particular simpler and more economical than manufacturing
by molding.
Le problème qui se pose pour la réalisation d'un tube muni
d'un fond à partir d'une gaine est la formation du fond. Un procédé ac
tuellement existant consiste à former le fond à partir de la paroi de
la gai#ne elle-même, par matriçage à très- haute température. Selon ce
procédé, la partie supérieure de la paroi- du tube est tout d'abord chauf
fée à très haute température de manière à assurer son ramollissement.The problem which arises for the realization of a tube provided
of a bottom from a sheath is the formation of the bottom. An ac process
existing is to form the bottom from the wall of
the gai # ne itself, by stamping at very high temperature. According to what
process, the upper part of the wall of the tube is firstly heated
fairy at very high temperature so as to ensure its softening.
Cette extrémité ramollie est ensuite formée par un moule présentant inte
rieurement la forme que l'on désire donner au fond du tube qui est appli
quée à une pression élevée. La paroi du tube qui a été ramollie se resserre donc sur elle-même et se soude.This softened end is then formed by a mold having inte
laughingly the shape that we want to give to the bottom of the tube that is applied
high pressure. The wall of the tube which has been softened therefore tightens on itself and welds.
Un inconvénient majeur de ce procédé est que du fait de sa
nature elle-même, l'épaisseur du fond du tube n'est pas uniforme. Par
ailleurs, celui-ci peut présenter localement des fissures ou une épais
seur insuffisante qui nuisent à sa résistance mécanique et à son étanchéTté. Ce procédé, de plus, est coûteux, car il nécessite le chauffage à
très haute température d'une quantité importante de matière . D'autre
part, il n'est pas applicable à toute forme de gaine tubulaire ni à tout
matériau thermo-plastique. Par exemple le polyéthylene basse densité
se prête mal à ce mode de déformation. Enfin, il ne permet pas l'adjonc-
tion d'accessoires au fond, telles que une ouverture filetée ou non etc....A major drawback of this process is that due to its
nature itself, the thickness of the bottom of the tube is not uniform. By
elsewhere, it may locally have cracks or a thick
insufficient strength which adversely affects its mechanical strength and its tightness. This process, moreover, is expensive because it requires heating to
very high temperature of a significant amount of material. Else
apart, it is not applicable to any form of tubular sheath or to any
thermo-plastic material. For example low density polyethylene
does not lend itself well to this mode of deformation. Finally, it does not allow the adjou-
tion of accessories at the bottom, such as a threaded opening or not etc ...
Un autre procédé actuellement existant consiste à rapporter
à une section de gaine tubulaire un embout, qui est soude à la section
par friction. Ce procédé présente l'inconvénient majeur de ne permettre
la réalisation que de tubes à fond rapporté de section circulaire. En
effet, la soudure par friction nécessite une rotation relative de la
section de la gaine et de l'embout.Another currently existing method is to report
to a section of tubular sheath a nozzle, which is welded to the section
by friction. This process has the major drawback of not allowing
the production of tubes with attached bottom of circular section. In
effect, friction welding requires a relative rotation of the
sheath and tip section.
Un des but de la présente invention est de proposer un procé
dé de fabrication d'un tube fond rapporte à partir d'une gaine tubu laire en matière thermo-plastique qui soi# applicable quelle que soit la forme d'une section transversale de ce tube.One of the aims of the present invention is to propose a process
thimble for manufacturing a bottom tube relates from a tubular sheath made of thermoplastic material which is # applicable whatever the shape of a cross section of this tube.
Un autre but de la présente invention est de proposer un procédé qui permette de rapporter à la gaine un fond muni d'accessoires. Another object of the present invention is to provide a method which makes it possible to attach a bottom provided with accessories to the sheath.
Un autre tiut de la présente invention est de proposer un procédé qui permette de réaliser un fond d'épaisseur homqgene et déterminé. Another task of the present invention is to provide a process which makes it possible to produce a bottom of uniform and determined thickness.
D'autres buts et avantages de la présente invention apparaf- tront au cours de la description qui va suivre., qui n'est cependant donnée qu'à titre indicatif, et qui n'a pas pour but de la limiter. Other objects and advantages of the present invention will become apparent during the description which follows, which is however only given for information and which is not intended to limit it.
Le procédé de fabrication d'un tube à fond rapporte, à partir d'une gaine tubulaire et d'une pastille en matière thermo-plastique selon l'inventi-on est caractérisé par le fait que l'on introduit à l'intérieur de la gaine au niveau de l'une de ses extrémités une pastille de dimensions légèrement inférieures aux dimensions intérieures de la gaine, on chauffe localement la périphérie de la pastille et la partie de la gaine située entre la pastille et son extrémité, on rabat la dite partie de la gaine et la comprime sur la dite périphérie de la pastille. The method of manufacturing a bottom tube yields, from a tubular sheath and a pellet of thermo-plastic material according to the inventi-on is characterized in that one introduces inside the sheath at one of its ends a patch of dimensions slightly smaller than the internal dimensions of the sheath, the periphery of the patch is heated locally and the part of the sheath located between the patch and its end, the said flap is folded down part of the sheath and compresses it on said periphery of the patch.
L'invention sera mieux comprise si l'on se réfère à la description ci-dessous, ainsi qu'aux dessins en annexe qui en font partie intégrante. The invention will be better understood if reference is made to the description below, as well as to the accompanying drawings which form an integral part thereof.
La figure 1 illustre la première phase du procédé de fabrication selon l'invention. Figure 1 illustrates the first phase of the manufacturing process according to the invention.
La fi-gure 2 illustre la deuxième phase de ce procédé. Figure 2 illustrates the second phase of this process.
Dans la figure 1, on a représenté en coupe une gaine tubulaire 1 en matériau thermo-plastique. Cette gaine présente une longueur quelconque, et une section également quelconque. De préférence, elle est cylindrique, bien que le procédé selon l'invention soit également compatible avec des gaines par exemple tronconiques ou d'autres formes. In Figure 1, there is shown in section a tubular sheath 1 in thermoplastic material. This sheath has any length, and also any section. Preferably, it is cylindrical, although the method according to the invention is also compatible with sheaths, for example frustoconical or other shapes.
On introduit à une extrémité de la gaine une pastille 2. Cette pastille présente au niveau de sa périphérie des dimensions légèrement inférieures aux dimensions intérieures de la gaine 1 au niveau de son extrémité dans laquelle est introduite la pastille. A pellet 2 is introduced at one end of the sheath. This pellet has at its periphery dimensions slightly smaller than the internal dimensions of the sheath 1 at its end into which the pellet is introduced.
Par ailleurs, cette pastille présente toute forme appropriée par exemple plane ou incurvée. Elle peut être. par ailleurs munie d'accessoires telles qu'une ouverture, une ouverture filetée, etc.... Furthermore, this pellet has any suitable shape, for example flat or curved. She may be. moreover provided with accessories such as an opening, a threaded opening, etc.
De même que la gaine 1, la pastille est réalisée en matière thermo-plastique, mai-s qui peut cependant présenter des caractéristiques physiques et chimiques différentes de. la mati:ère de la gaine. La pastille 2 peut présenter également une couleur différente de celle de la gaine. Like the sheath 1, the pellet is made of thermo-plastic material, which may however have physical and chemical characteristics different from. the material of the sheath. The patch 2 may also have a different color from that of the sheath.
La profondeur d'introduction de la pastille à l'interieur de la gaine est variable, et dépend principalement des dimensions de la pastille et de la nature des matériaux. Cependant, la profondeur d'introduction 3, qui peut être définie comme la hauteur de la gaine comprise entre la face supérieure 4 de la pastille et l'extrémité supérieure de la gaine, est supérieure au jeu qui existe entre la pastille et la paroi interi~eure de la gaine. De préférence, cette profondeur d'introduction est sensiblement constante sur le contour de la gaine. The insertion depth of the tablet inside the sheath is variable, and depends mainly on the dimensions of the tablet and the nature of the materials. However, the insertion depth 3, which can be defined as the height of the sheath between the upper face 4 of the patch and the upper end of the sheath, is greater than the clearance that exists between the patch and the interior wall. ~ sheath. Preferably, this insertion depth is substantially constant over the contour of the sheath.
Après introduction, la pastille est maintenue en position par tout moyen approprié. La figure 1 donne à cet effet un exemple non limitatif. After introduction, the pellet is held in position by any suitable means. Figure 1 gives a non-limiting example for this purpose.
La gaine 1 peut être introduite sur un mandrin 5 présentant une surface extérieure complémentaire de la face intérieure de la gaine. The sheath 1 can be introduced on a mandrel 5 having an external surface complementary to the internal face of the sheath.
Ce mandrin 5 peut comporter un épaulement 6 sur lequel prend appui la partie inférieure 7 de la gaine. Dans sa parti-e supérieure, il présente une surface 8 sur laquelle prend appui la pastille, au moins au niveau de sa périphérie. Dans sa partie supérieure, le mandrin présente des moyens pour maintenir la pastille 2. Ces moyens peuvent consister en une cavite, par exemple tronconique inversée 9 située dans la partie supérieure du mandrin dont la plus grande section est obturée par la pastille. Dans cette cavait tronconique, une dépression est réalisée, par exemple par l'intermédiaire d'un conduit 10. De ce fait, la pastille est maintenue en posi-tion introduite par rapport à la gaine.This mandrel 5 may include a shoulder 6 on which the lower part 7 of the sheath bears. In its upper part, it has a surface 8 on which the pellet rests, at least at its periphery. In its upper part, the mandrel has means for holding the pellet 2. These means can consist of a cavity, for example inverted frustoconical 9 located in the upper part of the mandrel, the largest section of which is closed by the pellet. In this frustoconical cavity, a depression is produced, for example by means of a conduit 10. As a result, the pellet is maintained in the inserted position with respect to the sheath.
Selon l'invention, on chauffe la pastille, au moins au niveau de sa périphérie et l'extrémité de la gaine dans laquelle a été introduite la pastille, au moins dans sa partie située entre la face supérieure de la pastille et son extrémité. De préférence, on chauffe la pastille sur la périphérie de sa surface supérieure 11, et la face interne 12 de l'extrémité de la gaine. According to the invention, the pellet is heated, at least at its periphery and the end of the sheath in which the pellet has been introduced, at least in its part situated between the upper face of the pellet and its end. Preferably, the pellet is heated on the periphery of its upper surface 11, and the internal face 12 of the end of the sheath.
Le mode de chauffage est approprié à- la nature des matériaux qui composent #la gaine et la pastille. Il peut consister, par exemple, en un chauffage par conduction, par rayonnement, etc.... The heating mode is suitable for the nature of the materials which make up the sheath and the tablet. It may consist, for example, of heating by conduction, by radiation, etc.
La figure 1, à titre d'exemple non limitatif, schématise une matrice chauffante 13 présentant dans sa partie inférieure deux surfaces de chauffe 14 et 15 respectivement complémentaires des surfaces 12 de la gaineet 11 de la pastille a chauffer. Cette matrice est représentée en position de travail en trait pointille 16#. Figure 1, by way of non-limiting example, shows schematically a heating matrix 13 having in its lower part two heating surfaces 14 and 15 respectively complementary to the surfaces 12 of the sheath and 11 of the pellet to be heated. This matrix is represented in working position in dotted line 16 #.
Le temps de chauffe, ainsi que l'intensité de chauffe sont déterminés de manière à provoquer superficiellement au niveau de la zone 12 de la paroi interne de la gaine et de la zone 11 de la périphérie de la pastille une fusion de la matière qui permette de réaliser ensuite la soudure de ces deux zones dans la phase suivante. il faut remarquer que lors du chauffage, la chaleur diffuse dans l'épaisseur de la pastille et de la paroi de la gaine, ce qui rend en particulier la paroi de la gaine malléable. Cependant, le chauffage est réalisé de manière à éviter leur déformation. C'est donc un chauffage local. The heating time, as well as the heating intensity, are determined so as to cause surface 12 of the inner wall of the sheath and of zone 11 of the periphery of the pellet to melt the material which allows then carry out the welding of these two zones in the next phase. it should be noted that during heating, the heat diffuses in the thickness of the pellet and the wall of the sheath, which in particular makes the wall of the sheath malleable. However, the heating is carried out so as to avoid their deformation. It is therefore local heating.
A cet effet, le chauffage peut être réalisé simultanément mais de manière différente au niveau des zones 11 et 12 de la pastille et de la gaine. A titre d'exemple, dans le cas d'une matrice chauffante 13, ses surfaces de chauffe 14 et 15 peuvent être élevées à des tempé- ratures différentes, ceci permet en particulier de l'adapter à leur nature respective, leur épaisseur, etc
Le jeu qui existe entre la pastille et la gaine permet d'une part l'introduction de la pastille à l'inténeur de la gaine, mais également tient compte de la dilatation de la pastille lors de son chauffage ge.A titre d'exemple, ce jeu est de l'ordre de quelques dizièmes de millimètre pour une pastille de 50 mm de diamètre environ.For this purpose, the heating can be carried out simultaneously but in a different manner in the areas 11 and 12 of the patch and of the sheath. By way of example, in the case of a heating matrix 13, its heating surfaces 14 and 15 can be raised to different temperatures, this in particular makes it possible to adapt it to their respective nature, their thickness, etc.
The clearance which exists between the patch and the sheath allows on the one hand the introduction of the patch into the interior of the sheath, but also takes into account the expansion of the patch during its heating ge. , this clearance is of the order of a few tenths of a millimeter for a pellet of approximately 50 mm in diameter.
La pastille est chauffée dans sa zone périphérique 11 sur une largeur en correspondance avec la profondeur 3 d'introduction à l'intérieur de la gaine. De préférence, cette largeur est légèrement supérieure. A titre d'exemple non limitatif, pour réaliser un tube cylindrique de révolution d'environ 50 mm de diamètre, la pastille est chauffée dans sa zone périphérique sur une largeur de 2 à 3 mm et la paroi interne de la gaine également sur une profondeur de 2 à 3 mm environ. Egalement à titre d'exemple non limitatif, pour un tube et une pastille en polypropylene, le chauffage est réalisé au moyen d'une matrice chauffante, telle que celle schématisée dans la figure 1, à une température comprise entre 150 et 180 degrés, pendant 3 à 5 dixièmes de seconde.Pour un tube et une pastille en polyéthylène, le chauffage est réalisé entre 100 et 140 C pendant une seconde environ. The pellet is heated in its peripheral zone 11 over a width corresponding to the depth 3 of introduction into the sheath. Preferably, this width is slightly greater. By way of nonlimiting example, to make a cylindrical tube of revolution of about 50 mm in diameter, the pellet is heated in its peripheral zone over a width of 2 to 3 mm and the internal wall of the sheath also over a depth from 2 to 3 mm approximately. Also by way of nonlimiting example, for a polypropylene tube and pellet, the heating is carried out by means of a heating matrix, such as that shown diagrammatically in FIG. 1, at a temperature between 150 and 180 degrees, during 3 to 5 tenths of a second. For a tube and a polyethylene pellet, the heating is carried out between 100 and 140 C for approximately one second.
Lorsque le chauffage est réalisé, les moyens de chauffage sont retirés et l'extrémité supérieure de la paroi de la gaine est rabattue puis comprimée sur la périphérie de la pastille. Cette opération a pour effet de mettre en contact la zone 12 de la face interne de la gaine et la zone 11 de la surface supérieure de la pastille et de réaliser ainsi leur soudure par interpénétration de leur matière en fusion superficielle respective. When the heating is carried out, the heating means are removed and the upper end of the wall of the sheath is folded down and then compressed on the periphery of the pellet. This operation has the effect of bringing zone 12 of the internal face of the sheath into contact with zone 11 of the upper surface of the patch and thus producing their welding by interpenetration of their respective surface molten material.
Cette opération est réalisée par tout moyen approprie, et par exemple par une matrice de frappe 17 présentant une surface utile 18 correspondant au moins à la zone 11 de la face supérieure de la pastille qui a été chauffée. De préférence, cette surface utile s'étend vers l'interieur du tube sur une largeur supérieure à la largeur de la zone chauffée 11. This operation is carried out by any suitable means, and for example by a striking die 17 having a useful surface 18 corresponding at least to the zone 11 of the upper face of the pellet which has been heated. Preferably, this useful surface extends towards the inside of the tube over a width greater than the width of the heated zone 11.
Dans un mode préférentiel de mise en oeuvre, la matrice présente une surface 19 tronconique dont la plus petite section est constituée par sa surface utile 18. De préférence également, la jonction entre la surface tronconique 19 et la surface utile 18 est arrondie. Cette forme de la matrice de frappe permet de faciliter son positionnement par rapport au tube, et de faciliter également le rabattement de l'ex tremité supérieure de sa paroi sur la pastille. La forme arrondie 20 permet également de donner à la jonction entre la paroi de la gaine et la pastille une forme arrondie. In a preferred embodiment, the matrix has a frustoconical surface 19, the smallest section of which is constituted by its useful surface 18. Preferably also, the junction between the frustoconical surface 19 and the useful surface 18 is rounded. This shape of the striking matrix makes it possible to facilitate its positioning with respect to the tube, and also to facilitate the folding of the upper extremity of its wall on the pellet. The rounded shape 20 also makes it possible to give the junction between the wall of the sheath and the patch a rounded shape.
La matrice de frappe est représentée en trait pointillé 22 en position basse. Dans cette position, l'extrémité de la paroi de la gaine située au-dessus de la pastille a été rabattue sur la zone péripherique de la pastille et comprimée sur elle. La compression a lieu entre la surface utile 18 de la matrice 17 et la surface superieure 21 du mandrin qui maintient la pastille. The striking matrix is shown in dotted lines 22 in the low position. In this position, the end of the wall of the sheath situated above the tablet has been folded over the peripheral zone of the tablet and pressed onto it. The compression takes place between the useful surface 18 of the die 17 and the upper surface 21 of the mandrel which holds the pellet.
Naturellement, ces deux surfaces présentent une forme correspondant a la forme plane ou incurvée de la pastille. Naturally, these two surfaces have a shape corresponding to the flat or curved shape of the pellet.
D'autre part, de préférence, la matrice de frappe 17 est refroidie, de manière à assurer plus rapidement la prise de la soudure. On the other hand, preferably, the impact die 17 is cooled, so as to ensure the setting of the weld more quickly.
Dans certaines conditions de réalisation, on a remarque qu'il se formait sous le niveau de la pastille, au niveau de sa jonction avec la paroi interne du tube un bourrelet qui provient d'un fluage de la matière en fusion de la gaine lors de sa soudure. Ce bourrelet améliore le maintien de la pastille par rapport à la gaine, ainsi que l'etanchelte entre la face inférieure de la pastille et la paroi interne de la gaine. Under certain conditions of implementation, it has been noted that a bead is formed below the level of the pellet, at its junction with the internal wall of the tube, which results from a flow of the molten material from the sheath during its welding. This bead improves the retention of the patch relative to the sheath, as well as the seal between the underside of the patch and the inner wall of the sheath.
A titre d'exemple non limitatif, on a obtenu de bons résultats en utilisant une matrice exerçant une pression de 2 à 3 tonnes environ sur le fond du tube. By way of nonlimiting example, good results have been obtained using a matrix exerting a pressure of approximately 2 to 3 tonnes on the bottom of the tube.
Après cette opération, le tube muni de son fond peut être retiré du mandrin 5 et subir toute sorte d'opération ou de traitement. After this operation, the tube provided with its bottom can be removed from the mandrel 5 and undergo any kind of operation or treatment.
Le procédé selon l'invention permet donc de réaliser des tubes munis d'un fond dont l'épaisseur est constante, et dont l'etanchelte est assurée d'une part par la soudure et d'autre part par le bourrelet qui se forme dans certaines conditions. The method according to the invention therefore makes it possible to produce tubes provided with a bottom the thickness of which is constant, and the sealing of which is ensured on the one hand by the welding and on the other hand by the bead which is formed in certain conditions.
Par ailleurs, il découle de manière évidente de ce qui vient d'être décrit que le procédé selon l'invention est compatible avec toute forme de section transversale de la gaine. Il suffit en effet d'adopter pour le mandrin, pour la pastille, pour les matrices de chauffe et de frappe des formes en correspondance avec la section de la gaine. Par ailleurs, le procédé selon l'invention permet d'adapter des cadences de fabrication beaucoup plus rapides que pour les procédés déjà existants et d'obtenir des tubes dont la paroi et le fond ont des propriétés physiques ou chimiques différentes, une couleur différente, une épaisseur différente, etc.... Furthermore, it is obvious from what has just been described that the method according to the invention is compatible with any form of cross section of the sheath. It suffices in fact to adopt shapes for the mandrel, for the pellet, for the heating and striking dies corresponding to the section of the sheath. Furthermore, the method according to the invention makes it possible to adapt production rates much faster than for the already existing methods and to obtain tubes whose wall and bottom have different physical or chemical properties, a different color, a different thickness, etc.
Naturellement, le procédé qui vient d'être décrit n'est donné qu'à titre indicatif, et l'on pourrait adopter d'autres mises en oeuvre de la présente invention sans pour autant sortir du cadre de cell-e-ci. Naturally, the process which has just been described is given for information only, and other implementations of the present invention could be adopted without departing from the scope of the present invention.
Claims (10)
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8020866A FR2490542A1 (en) | 1980-09-23 | 1980-09-23 | PROCESS FOR THE MANUFACTURE OF AN INSERTED BOTTOM TUBE |
BE1/10305A BE890167A (en) | 1980-09-23 | 1981-09-01 | PROCESS FOR THE MANUFACTURE OF AN INSERTED BOTTOM TUBE |
DE19813136130 DE3136130A1 (en) | 1980-09-23 | 1981-09-11 | Process for producing a pipe with an inserted base of thermoplastic material |
NL8104278A NL8104278A (en) | 1980-09-23 | 1981-09-16 | METHOD FOR MANUFACTURING A TUBE CONTAINING THERMOPLASTIC MATERIAL WITH REACTIVATED BOTTOM |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR8020866A FR2490542A1 (en) | 1980-09-23 | 1980-09-23 | PROCESS FOR THE MANUFACTURE OF AN INSERTED BOTTOM TUBE |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2490542A1 true FR2490542A1 (en) | 1982-03-26 |
FR2490542B1 FR2490542B1 (en) | 1983-06-10 |
Family
ID=9246384
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR8020866A Granted FR2490542A1 (en) | 1980-09-23 | 1980-09-23 | PROCESS FOR THE MANUFACTURE OF AN INSERTED BOTTOM TUBE |
Country Status (4)
Country | Link |
---|---|
BE (1) | BE890167A (en) |
DE (1) | DE3136130A1 (en) |
FR (1) | FR2490542A1 (en) |
NL (1) | NL8104278A (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19722293B4 (en) * | 1997-05-28 | 2005-08-25 | Julius Kugler & Co. Gmbh | Method and device for closing a container |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1603487A (en) * | 1967-12-06 | 1971-04-19 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3052926A (en) * | 1954-09-13 | 1962-09-11 | American Can Co | Method of closing the open end of a plastic container |
DE1042679B (en) * | 1955-04-26 | 1958-11-06 | Rudolf Mohr Dr | Method for closing the installation opening of vessels of electrical collectors made of polyethylene |
US2989785A (en) * | 1959-06-25 | 1961-06-27 | William F Stahl | Method of forming plastic containers |
US3144495A (en) * | 1960-09-15 | 1964-08-11 | American Can Co | Containers and method of making |
US3369726A (en) * | 1966-03-04 | 1968-02-20 | Phillips Petroleum Co | Container |
-
1980
- 1980-09-23 FR FR8020866A patent/FR2490542A1/en active Granted
-
1981
- 1981-09-01 BE BE1/10305A patent/BE890167A/en not_active IP Right Cessation
- 1981-09-11 DE DE19813136130 patent/DE3136130A1/en not_active Ceased
- 1981-09-16 NL NL8104278A patent/NL8104278A/en not_active Application Discontinuation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1603487A (en) * | 1967-12-06 | 1971-04-19 |
Also Published As
Publication number | Publication date |
---|---|
FR2490542B1 (en) | 1983-06-10 |
NL8104278A (en) | 1982-04-16 |
BE890167A (en) | 1982-01-04 |
DE3136130A1 (en) | 1982-04-08 |
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