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FR2679486A1 - Device for welding of plastics - Google Patents

Device for welding of plastics Download PDF

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Publication number
FR2679486A1
FR2679486A1 FR9109418A FR9109418A FR2679486A1 FR 2679486 A1 FR2679486 A1 FR 2679486A1 FR 9109418 A FR9109418 A FR 9109418A FR 9109418 A FR9109418 A FR 9109418A FR 2679486 A1 FR2679486 A1 FR 2679486A1
Authority
FR
France
Prior art keywords
tube
welding
weld
transfer fluid
resistor
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.)
Pending
Application number
FR9109418A
Other languages
French (fr)
Inventor
Humbert Robert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to FR9109418A priority Critical patent/FR2679486A1/en
Publication of FR2679486A1 publication Critical patent/FR2679486A1/en
Pending legal-status Critical Current

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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
    • 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
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • 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
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/226—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip characterised by the cross-section of said heated wire, resistive ribbon, resistive band or resistive strip, e.g. being triangular
    • 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
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/226—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip characterised by the cross-section of said heated wire, resistive ribbon, resistive band or resistive strip, e.g. being triangular
    • B29C65/227—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip characterised by the cross-section of said heated wire, resistive ribbon, resistive band or resistive strip, e.g. being triangular said cross-section being hollow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • 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
    • B29C65/38—Impulse heating
    • 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
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B29C65/7441—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc for making welds and cuts of other than simple rectilinear form
    • 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
    • B29C66/003—Protecting areas of the parts to be joined from overheating
    • 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
    • B29C66/03—After-treatments in the joint area
    • B29C66/034—Thermal after-treatments
    • B29C66/0342—Cooling, e.g. transporting through welding and cooling zone
    • 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
    • B29C66/01—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
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/244—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being non-straight, e.g. forming non-closed contours
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B29C66/81811—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the welding jaws
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B29C66/81811—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the welding jaws
    • B29C66/81812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects of the welding jaws the welding jaws being cooled from the outside, e.g. by blowing a gas or spraying a liquid
    • 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
    • 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
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/851—Bag or container making machines
    • B29C66/8511—Bag making machines
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/16—Cooling

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

The resistance element (resistor) used consists of a thin-walled metal tube (1) extending along a platen (plate) (3) in a path corresponding to the shape of the weld (seam) desired, the said tube being internally filled with a continuously circulating heat-transfer fluid (15). The welding and cutting edge (14) of the tube is subjected to a complementary air-cooling jet. Application to the welding of plastic bags.

Description

Dispositif pour le soudage de matières plastiques.Device for welding plastics.

L'invention se rapporte à un dispositif de soudage d'une matière plastique thermosoudable notamment pour la confection de sachets à partir de films découpés, et concerne plus précisément un dispositif de soudage par impulsion. The invention relates to a device for welding a heat-sealable plastic material in particular for making bags from cut films, and more specifically relates to a pulse welding device.

Pour former des sachets par soudage de films thermoplastiques prédécoupés, il est bien connu d'utiliser des presses qui appliquent les parties à souder contre une plaque chauffante portée à la température nécessaire. La matière plastique des surfaces en contact devient alors pâteuse et on peut alors les presser ensemble pour obtenir une soudure solide et homogène. Les éléments chauffants qui peuvent être des électrodes ou des fils résistants alimentés en courant électrique, sont logés dans des barres ou des plaques chauffantes de ladite presse. On utilise aussi parfois un procédé de chauffage par induction, qui nécessite de placer un insert métallique à l'endroit de la soudure à réaliser. L'insert est alors chauffé par une bobine d'induction placée à proximité et la matière plastique qui l'entoure se ramollit. Par application d'une pression convenable, on peut alors réaliser une soudure. L'existense de cet insert métallique rend difficile le thermosoudage de certaines pièces de configuration particulière, et il augmente en outre sensiblement le cout de l'opération. To form sachets by welding precut thermoplastic films, it is well known to use presses which apply the parts to be welded against a heating plate brought to the necessary temperature. The plastic of the surfaces in contact then becomes pasty and can then be pressed together to obtain a solid and homogeneous weld. The heating elements which can be electrodes or resistant wires supplied with electric current, are housed in bars or hot plates of said press. An induction heating process is also sometimes used, which requires placing a metal insert at the location of the weld to be produced. The insert is then heated by an induction coil placed nearby and the plastic that surrounds it softens. By applying a suitable pressure, a weld can then be produced. The existence of this metal insert makes it difficult to heat seal certain parts of particular configuration, and it also significantly increases the cost of the operation.

Pour éviter ces inconvénients, le Demandeur a mis au point une technique de soudage par impulsions qui utilise une résistance tubulaire dont la forme correspond au cheminement de la soudure recherchée, résistance qui dispose en outre de moyens de refroidissement. To avoid these drawbacks, the Applicant has developed a pulse welding technique which uses a tubular resistance whose shape corresponds to the path of the desired weld, a resistance which also has cooling means.

Certes il est bien connu d'utiliser des moyens de refroidissement d'un élément chauffant, qui sont constitués par exemple de canaux de circulation de fluide de refroidissement réalisés dans la masse du support ou encore de buses de soufflage d'air sur la zone de la soudure. Mais là encore, la mise en oeuvre de ces dispositifs de refroidissement est difficile et se fait au détriment de la souplesse d'emploi et des possibilités d'adaptation à tous profils de soudure recherchés, de la presse utilisée. Admittedly, it is well known to use means for cooling a heating element, which consist, for example, of coolant circulation channels produced in the mass of the support or else of air blowing nozzles in the area of the welding. But here again, the implementation of these cooling devices is difficult and is to the detriment of the flexibility of use and the possibilities of adaptation to all desired welding profiles, of the press used.

Un objet de la présente invention consiste donc en un dispositif pour le soudage de matières plastiques à l'aide d'au moins une résistance soumise à une impulsion de courant électrique, dispositif selon lequel la résistance est constituée d'un tube métallique à paroi fine se développant sur une platine selon un cheminement correspondant à la forme de la soudure recherchée, ledit tube étant rempli intérieurement d'un fluide caloporteur à circulation permanente, le liseré de soudure du tube étant soumis à un jet de refroidissement complémentaire à air. An object of the present invention therefore consists of a device for welding plastics using at least one resistor subjected to an electric current pulse, device according to which the resistor consists of a thin-walled metal tube developing on a plate along a path corresponding to the shape of the desired weld, said tube being internally filled with a heat transfer fluid with permanent circulation, the weld border of the tube being subjected to a complementary air cooling jet.

Selon une caractéristique particulière de l'invention, le tube est constitué d'une enveloppe métallique intérieure, d'un revêtement isolant extérieur et, à sa partie supérieure, d'une nervure profilée constituant le liseré de soudure. A l'intérieur du tube, un fluide circule de façon permamente, en circuit fermé, sous l'action d'une pompe de circulation. According to a particular characteristic of the invention, the tube consists of an inner metal casing, an outer insulating coating and, at its upper part, a profiled rib constituting the welding border. Inside the tube, a fluid circulates permanently, in a closed circuit, under the action of a circulation pump.

Selon une autre caractéristique de l'invention, autour du tube est ménagé un espace annulaire communiquant par des circuits de passage avec une tubulure de distribution d'air, un diffuseur réglable permettant d'augmenter ou de diminuer le débit d'air admis dans 1 espace annulaire. According to another characteristic of the invention, around the tube is formed an annular space communicating by passage circuits with an air distribution pipe, an adjustable diffuser making it possible to increase or decrease the air flow admitted into 1 annular space.

D'autres caractéristiques particulières et avantages de l'invention apparaîtront à la lecture de la description qui va suivre d'une forme de réalisation prise à titre d'exemple non limitatif dans laquelle on se réfère aux dessins annexés qui représentent
figure 1 une vue en coupe du dispositif de soudage
figure 2 une vue schématique en plan de la platine du support. Other particular characteristics and advantages of the invention will appear on reading the following description of an embodiment taken by way of nonlimiting example in which reference is made to the appended drawings which represent
Figure 1 a sectional view of the welding device
Figure 2 a schematic plan view of the support plate.

En référence aux figures, un dispositif de soudage pour réaliser des soudures d'un film en matériau plastique thermosoudable comprend essentiellement une platine support fixe 3 et une presse 2 susceptible de s'appliquer contre la platine, les films de matériau 4 étant intercalés entre les deux. Dans le support 2 se développe selon un cheminement particulier tel que représenté à la figure 2, en l'occurence un profil ayant plusieurs points d'inflexion B, C, D entre un point de départ A et un point d'arrivée E, un tube métallique jouant le rôle de résistance de chauffage, désigné dans son ensemble par la référence 1. Le tube 1 forme une ligne brisée de A à E qui correspond au profil de la soudure recherchée. Bien entendu la platine 3 dispose de cales ou supports amovibles non représentés permettant de remplacer ce tube profilé particulier par tout autre dessin de tube de chauffage. With reference to the figures, a welding device for making welds of a film of heat-sealable plastic material essentially comprises a fixed support plate 3 and a press 2 capable of being applied against the plate, the films of material 4 being interposed between the of them. In the support 2 develops along a particular path as shown in Figure 2, in this case a profile having several inflection points B, C, D between a starting point A and an ending point E, a metal tube playing the role of heating resistor, generally designated by the reference 1. The tube 1 forms a broken line from A to E which corresponds to the profile of the weld sought. Of course, the plate 3 has shims or removable supports, not shown, making it possible to replace this particular profiled tube with any other design of the heating tube.

En se référant à la figure 1, on voit que le tube 1 est constitué d'une enveloppe métallique intérieure 10, et d'un revêtement isolant extérieur 11. Le tube - sur toute sa longueur, est rempli d'un fluide caloporteur 15 avantageusement de l'huile, qui circule en permanence de A à
B, dans un circuit fermé grâce à une petite pompe de circulation 12 (figure 2). En outre le tube 1 est raccordé à chacune de ses extrémités, aux bornes d'un générateur à haute-fréquence non représenté. Sur toute sa longueur, à la partie supérieure du tube 1 est soudée une nervure profilée 13 qui déborde légèrement au dessus du plan supérieure de la platine. Dans l'exemple représenté la nervure se termine vers le haut par une face inclinée 14 qui constitue le liseré de soudure et de coupe.Referring to Figure 1, we see that the tube 1 consists of an inner metal casing 10, and an outer insulating coating 11. The tube - over its entire length, is advantageously filled with a heat transfer fluid 15 oil, which circulates continuously from A to
B, in a closed circuit thanks to a small circulation pump 12 (Figure 2). In addition, the tube 1 is connected at each of its ends, to the terminals of a high-frequency generator, not shown. Over its entire length, at the upper part of the tube 1 is welded a profiled rib 13 which projects slightly above the upper plane of the plate. In the example shown, the rib ends upwards by an inclined face 14 which constitutes the weld and cut border.

Dans la platine 3, tout le long du tube 1, est ménagé autour de celui-ci un espace annulaire 5 communiquant par des conduits de passage 6 avec une tubulure distribution d'air 7. Un diffuseur réglable 8 permet d'augmenter ou de diminuer le débit d'air admis dans l'espace 5. Enfin la platine 3 est refroidie également par une circulation d'eau dans un conduit intégré 9.  In the plate 3, all along the tube 1, is formed around the latter an annular space 5 communicating by passage conduits 6 with an air distribution tube 7. An adjustable diffuser 8 makes it possible to increase or decrease the air flow admitted into space 5. Finally, the plate 3 is also cooled by a circulation of water in an integrated duct 9.

Lorsqu'on veut souder ensemble les deux films de matériau plastique 4 selon le cheminement particulier AE de la figure 2, on les applique contre la nervure profilée 13 du tube 1 à l'aide de la presse 2. On applique alors au tube 1 une impulsion de courant qui porte immédiatement le tube à une température élevée par exemple de l'ordre de 3000. La fusion du film thermosoudable intervient immédiatement au niveau du liseré de soudure 14, sur toute la longueur du tube. Dès l'arrêt de l'impulsion de courant, le tube conducteur 1 se refroidit grâce à la circulation du fluide caloporteur 15, cette circulation étant permanente grâce à la pompe 12. Ce refroidissement rapide est une nécessité et un avantage car il permet le décollement du matériau thermosoudé. De son côté le plastique est aussi refroidi de façon complémentaire par un jet d'air dosé provenant de la tubulure 7 et distribué vers la nervure 13 en passant par l'espace annulaire 5, selon le réglage effectué à l'aide du diffuseur 8. La platine 3 est elle-même refroidie en permanence par une circulation d'eau dans le conduit 9. When the two films of plastic material 4 are to be welded together along the particular path AE of FIG. 2, they are applied against the profiled rib 13 of the tube 1 using the press 2. A tube is then applied to the tube 1 current pulse which immediately brings the tube to a high temperature, for example of the order of 3000. The fusion of the heat-sealable film takes place immediately at the weld line 14, over the entire length of the tube. As soon as the current pulse stops, the conductive tube 1 cools down thanks to the circulation of the heat transfer fluid 15, this circulation being permanent thanks to the pump 12. This rapid cooling is a necessity and an advantage because it allows detachment heat-sealed material. For its part, the plastic is also cooled in a complementary manner by a metered air jet coming from the tubing 7 and distributed towards the rib 13 passing through the annular space 5, according to the adjustment made using the diffuser 8. The plate 3 is itself permanently cooled by a circulation of water in the conduit 9.

Grâce à ce dispositif on peut souder notamment des sachets plastiques vides ou pleins, selon une soudure de n importe quelle forme. En effet il est aisé de monter sur la platine un tube 1 préformé selon le profil recherché puis de la brancher à la pompe de circulation de fluide caloporteur ainsi qu'au générateur de courant, et cela sans perte de temps. Thanks to this device, it is possible in particular to seal empty or full plastic bags, according to a weld of any shape. In fact, it is easy to mount on the plate a tube 1 preformed according to the desired profile and then to connect it to the heat transfer fluid circulation pump as well as to the current generator, without loss of time.

La face inclinée 14 formant le liseré de soudure du tube 1 peut être remplacé par un tout autre profil, par exemple une tête triangulaire avec ou sans liseré, selon la nature ou l'épaisseur des feuilles à thermosouder, ou encore toute autre forme permettant de souder et ayant une résistance mécanique suffisante.  The inclined face 14 forming the welding border of the tube 1 can be replaced by any other profile, for example a triangular head with or without border, depending on the nature or thickness of the sheets to be heat sealed, or any other form allowing weld and having sufficient mechanical resistance.

Claims (5)

REVENDICATIONS 1.- Dispositif pour le soudage de matières plastiques à l'aide d'au moins une résistance soumise à une impulsion de courant électrique, caractérisé en ce que la résistance est constituée d'un tube métallique (1) à paroi fine se développant sur une platine (3) selon un cheminement 1.- Device for welding plastics using at least one resistor subjected to an electric current pulse, characterized in that the resistor consists of a thin-walled metal tube (1) developing on a plate (3) along a path AE correspondant à la forme de la soudure recherchée, ledit tube étant rempli intérieurement d'un fluide caloporteur (15) à circulation permanente et en ce que le liseré de soudure (14) du tube est soumis à un jet de refroidissement complémentaire à air.AE corresponding to the shape of the desired weld, said tube being filled internally with a heat-transfer fluid (15) with permanent circulation and in that the weld line (14) of the tube is subjected to an additional air cooling jet. 2.- Dispositif selon la revendication 1, caractérisé en ce que le tube 1 est constitué d'une enveloppe métallique intérieure (10), d'un revêtement isolant extérieur (11), et à sa partie supérieure d'une nervure profilée (13) constituant le liseré de soudure (14). 2.- Device according to claim 1, characterized in that the tube 1 consists of an inner metal casing (10), an outer insulating coating (11), and at its upper part with a profiled rib (13 ) constituting the welding border (14). 3.- Dispositif selon les revendications 1 et 2, caractérisé en ce que le fluide caloporteur (15) circule dans un circuit fermé sous l'action d'une pompe de circulation (12). 3.- Device according to claims 1 and 2, characterized in that the heat transfer fluid (15) flows in a closed circuit under the action of a circulation pump (12). 4.- Dispositif selon les revendications 1 et 2, caractérisé en ce que, autour du tube (1) est ménagé un espace annulaire (5) communiquant par des circuits de passage avec une tubulure de distribution d'air (7). 4.- Device according to claims 1 and 2, characterized in that, around the tube (1) is formed an annular space (5) communicating by passage circuits with an air distribution pipe (7). 5.- Dispositif selon la revendication 4 caractérisé en ce que un diffuseur réglable (8) permet d'augmenter ou de diminuer le débit d'air admis dans l'espace (5).  5.- Device according to claim 4 characterized in that an adjustable diffuser (8) allows to increase or decrease the air flow admitted into the space (5).
FR9109418A 1991-07-25 1991-07-25 Device for welding of plastics Pending FR2679486A1 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0911141A2 (en) * 1997-10-21 1999-04-28 Fresenius Medical Care Deutschland GmbH Method and apparatus for welding plastic sheets, particularly sheets made from polyolefin

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Publication number Priority date Publication date Assignee Title
US2621704A (en) * 1950-02-11 1952-12-16 Langer Nicholas Heat sealing device
US2796914A (en) * 1950-04-05 1957-06-25 Emhart Mfg Co Heat sealing device
US2941575A (en) * 1955-09-14 1960-06-21 Paul R Malmberg Apparatus for dielectric fabrication
US3083757A (en) * 1960-11-15 1963-04-02 Phillips Petroleum Co Knife sealer for thermoplastic film or sheet
GB1011727A (en) * 1961-12-22 1965-12-01 Kurt Koerber Method and apparatus for welding the wrapper for packages
GB1062051A (en) * 1963-03-08 1967-03-15 Weldotron Corp Film sealing and cutting apparatus and method
DE1604564A1 (en) * 1966-12-31 1970-11-05 Habra Werk Ott Kg Heating device consisting of welding bands for welding thermoplastic plastics, primarily plastic films or the like. in the heat pulse method
US4267005A (en) * 1979-04-30 1981-05-12 Barnaby Roland E Heat sealing apparatus
JPS61262117A (en) * 1985-05-17 1986-11-20 Showa Denko Kk Heat sealing method
US4856259A (en) * 1988-10-17 1989-08-15 Baxter International Inc. Appratus for sealing and severing a web of film
US4856260A (en) * 1988-10-17 1989-08-15 Baxter International Inc. Apparatus for sealing a web of film in a packaging
DE3919165A1 (en) * 1989-06-12 1990-12-13 Heinz Schirmacher Gmbh Impulse heating to weld or cut plastics - by pressing between cooled contoured tools positioned opposite induction coils which are inside backing plate and connected to HF source

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2621704A (en) * 1950-02-11 1952-12-16 Langer Nicholas Heat sealing device
US2796914A (en) * 1950-04-05 1957-06-25 Emhart Mfg Co Heat sealing device
US2941575A (en) * 1955-09-14 1960-06-21 Paul R Malmberg Apparatus for dielectric fabrication
US3083757A (en) * 1960-11-15 1963-04-02 Phillips Petroleum Co Knife sealer for thermoplastic film or sheet
GB1011727A (en) * 1961-12-22 1965-12-01 Kurt Koerber Method and apparatus for welding the wrapper for packages
GB1062051A (en) * 1963-03-08 1967-03-15 Weldotron Corp Film sealing and cutting apparatus and method
DE1604564A1 (en) * 1966-12-31 1970-11-05 Habra Werk Ott Kg Heating device consisting of welding bands for welding thermoplastic plastics, primarily plastic films or the like. in the heat pulse method
US4267005A (en) * 1979-04-30 1981-05-12 Barnaby Roland E Heat sealing apparatus
JPS61262117A (en) * 1985-05-17 1986-11-20 Showa Denko Kk Heat sealing method
US4856259A (en) * 1988-10-17 1989-08-15 Baxter International Inc. Appratus for sealing and severing a web of film
US4856260A (en) * 1988-10-17 1989-08-15 Baxter International Inc. Apparatus for sealing a web of film in a packaging
DE3919165A1 (en) * 1989-06-12 1990-12-13 Heinz Schirmacher Gmbh Impulse heating to weld or cut plastics - by pressing between cooled contoured tools positioned opposite induction coils which are inside backing plate and connected to HF source

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Title
PATENT ABSTRACTS OF JAPAN vol. 11, no. 120 (M-580)(2567) 15 Avril 1987 & JP-A-61 262 117 ( SHOWA DENKO K.K. ) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0911141A2 (en) * 1997-10-21 1999-04-28 Fresenius Medical Care Deutschland GmbH Method and apparatus for welding plastic sheets, particularly sheets made from polyolefin
EP0911141A3 (en) * 1997-10-21 2000-09-27 Fresenius Medical Care Deutschland GmbH Method and apparatus for welding plastic sheets, particularly sheets made from polyolefin

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