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FR2557500A1 - Welding and separating press for bags made of weldable plastic - Google Patents

Welding and separating press for bags made of weldable plastic Download PDF

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Publication number
FR2557500A1
FR2557500A1 FR8320940A FR8320940A FR2557500A1 FR 2557500 A1 FR2557500 A1 FR 2557500A1 FR 8320940 A FR8320940 A FR 8320940A FR 8320940 A FR8320940 A FR 8320940A FR 2557500 A1 FR2557500 A1 FR 2557500A1
Authority
FR
France
Prior art keywords
welding
press
electrodes
separation
welding electrodes
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
FR8320940A
Other languages
French (fr)
Inventor
Roland De La Poype
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.)
Prepac SAS
Original Assignee
Prepac SAS
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 Prepac SAS filed Critical Prepac SAS
Priority to FR8320940A priority Critical patent/FR2557500A1/en
Publication of FR2557500A1 publication Critical patent/FR2557500A1/en
Pending legal-status Critical Current

Links

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
    • B29C65/74—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
    • B29C65/7433—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 the tool being a wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F3/00—Severing by means other than cutting; Apparatus therefor
    • B26F3/06—Severing by using heat
    • B26F3/08—Severing by using heat with heated members
    • B26F3/12—Severing by using heat with heated members with heated wires
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—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
    • B29C65/222—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip comprising at least a single heated wire
    • 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
    • B29C65/74—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
    • B29C65/745—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 a single unit having both a severing tool and a welding tool
    • 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
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8145—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/81457—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the constructional aspects of the pressing elements, e.g. of the welding jaws or clamps comprising a block or layer of deformable material, e.g. sponge, foam, rubber
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Package Closures (AREA)

Abstract

On one of the faces 5 of the opposite jaws 1, 4 of this press is mounted a combination of two welding electrodes 6, 7 which are spaced apart, parallel and permanently heated, and a separating thread 8 held at an equal distance from the two electrodes 6, 7 and heated by pulses only during the closing of the press.

Description

L'invention a pour objet une presse de soudure du genre de celles qui existent sur les machines à fabriquer des sachets pour le conditionnement des liquides à partir d'une feuille en matière plastique refermée en cylindre puis tronçonnée en sachets. The subject of the invention is a welding press of the type which exists on machines for making sachets for packaging liquids from a plastic sheet closed in a cylinder and then cut into sachets.

En général, sur ces machines la séparation entre les sachets successifs est réalisée en même temps que la soudure de scellement du sommet et du fond de ces sachets au moyen d'une presse de soudure qui comprend un unique fil de soudure et de séparation. Ce fil est parcouru par un courant électrique de sorte que l'on obtient le résultat recherché : une séparation et deux soudures distinctes de part et d'autre de la ligne de séparation. In general, on these machines the separation between the successive sachets is carried out at the same time as the sealing welding of the top and the bottom of these sachets by means of a welding press which comprises a single welding and separation wire. This wire is traversed by an electric current so that the desired result is obtained: a separation and two separate welds on either side of the separation line.

Une telle presse convient très bien pour la confection des sachets en polyéthylène mais elle nlest pas utilisable quand le film à partir duquel les sachets sont réalisés est en une autre matière, à base de nylon ou de polyester par exemple. Such a press is very suitable for making polyethylene bags but it is not usable when the film from which the bags are made is made of another material, for example nylon or polyester.

Le but principal de l'invention est de parvenir à une presse soudeuse capable d'exécuter en une seule opération de fermeture, sans emploi de moyens mécaniques de découpe, la soudure du sommet et du fond de deux sachets successifs, et leur séparation, quelle que soit la matière qui constitue la feuille initiale, à la seule condition qu'elle puisse être soudée à la chaleur. The main object of the invention is to achieve a welding press capable of performing in a single closing operation, without the use of mechanical cutting means, the welding of the top and the bottom of two successive sachets, and their separation, whatever whatever the material constituting the initial sheet, on the only condition that it can be heat welded.

A partir d'une presse ayant deux mâchoires de fermeture avec des faces opposées dont l'une est munie d'une garniture souple d'appui et dont l'autre est équipée des moyens de soudure et de séparation, selon l'invention lesdits moyens de soudure et de séparation sont constitués par la combinaison de deux électrodes thermiques de soudure espacées et parallèles et d'un fil de séparation s'étendant entre elles, espacé de l'une et de l'autre. From a press having two closing jaws with opposite faces, one of which is provided with a flexible support lining and the other of which is equipped with welding and separation means, according to the invention, said means welding and separation are formed by the combination of two spaced and parallel thermal welding electrodes and a separation wire extending between them, spaced from one and the other.

Les électrodes de soudure sont alimentées en permanence en courant électrique de chauffage tandis que le fil de séparation est alimenté par impulsions de courant, au moment voulu, pour qu'il coupe par fusion la matière constituant les sachets, entre les deux lignes de soudure. The welding electrodes are permanently supplied with electric heating current while the separation wire is supplied by current pulses, at the desired time, so that it cuts by fusion the material constituting the bags, between the two welding lines.

Les électrodes de soudure sont séparées par une distance de quelques millimètres, par exemple 4 à 10 mm, et le fil de séparation s'étend à égale distance de l'une et de l'autre. The welding electrodes are separated by a distance of a few millimeters, for example 4 to 10 mm, and the separation wire extends at an equal distance from one and the other.

On donnera maintenant sans intention limitative et sans exclure aucune variante, une description d'un exemple de réalisation. On se reportera à la figure unique annexée qui est une vue éclatée des deux mâchoires d'une presse de soudure et de séparation conforme à l'invention. We will now give without limiting intention and without excluding any variant, a description of an exemplary embodiment. Reference will be made to the attached single figure which is an exploded view of the two jaws of a welding and separation press according to the invention.

La presse représentée comprend une première mâchoire mobile 1 ayant une face active 2 qui porte une garniture 3 en matière souple, par exemple en caoutchouc. The press shown comprises a first movable jaw 1 having an active face 2 which carries a lining 3 made of flexible material, for example rubber.

Une seconde mâchoire fixe 4 est disposée en face de la mâchoire mobile 1, avec une face active 5 antagoniste de la face active 2 qui lui est opposée.A second fixed jaw 4 is arranged opposite the movable jaw 1, with an active face 5 antagonistic to the active face 2 which is opposite to it.

Sur cette face active 5 sont montées, de façon connue en soi, deux électrodes de soudure thermique 6, 7, parallèles, espacées l'une de l'autre de 8 mm environ, par exemple. Ces électrodes sont des fils résistants alimentés en courant électrique de manière permanente pour que leur température se stabilise à la valeur voulue ; leur détermination ne comporte pas de difficulté. On this active face 5 are mounted, in a manner known per se, two thermal welding electrodes 6, 7, parallel, spaced from each other by about 8 mm, for example. These electrodes are resistant wires permanently supplied with electric current so that their temperature stabilizes at the desired value; their determination does not involve any difficulty.

Sur la même face active 5 est monté un fil de séparation 8 qui s'étend entre les deux électrodes 6, 7 de soudure thermique à égale distance de l'une et de l'autre. On the same active face 5 is mounted a separation wire 8 which extends between the two electrodes 6, 7 of thermal welding at equal distance from one and the other.

Ce fil 8 est aussi un fil résistant mais il n'est alimenté en courant électrique que par impulsions, pendant la fermeture de la presse, de façon qu'il atteigne rapidement la température de fusion de la matière qui constitue les sachets afin de séparer ceux-ci. Cette opération de séparation se fait simultanément à l'exécution des deux soudures réalisées par les deux électrodes de soudure 6, 7, pendant une unique et brève fermeture de la presse. This wire 8 is also a resistant wire but it is supplied with electric current only by pulses, during the closing of the press, so that it quickly reaches the melting temperature of the material which constitutes the sachets in order to separate those -this. This separation operation is carried out simultaneously with the execution of the two welds produced by the two welding electrodes 6, 7, during a single and brief closing of the press.

Claims (4)

REVENDICATIONS 1. Presse de soudure et de séparation de sachets confectionnés à partir d'une feuille de matière plastique soudable comprenant deux mâchoires (1, 4) ayant des faces opposées (2, 5) dont l'une est munie d'une garniture souple d'appui (3) et dont l'autre est équipée de moyens de soudure et de séparation, caractérisée en ce que ces derniers moyens sont constitués par la combinaison de deux électrodes thermiques (6, 7) de soudure espacées et parallèles et d'un fil de séparation (8) s'étendant entre les deux électrodes de soudure (6, 7) et espacé de l'une et de l'autre. 1. Welding and separating press for sachets made from a sheet of weldable plastic comprising two jaws (1, 4) having opposite faces (2, 5), one of which is provided with a flexible lining d 'support (3) and the other of which is equipped with welding and separation means, characterized in that the latter means are constituted by the combination of two thermal electrodes (6, 7) of spaced and parallel welding and a separation wire (8) extending between the two welding electrodes (6, 7) and spaced from one and the other. 2. Presse selon la revendication 1 caractérisée en ce que les deux électrodes de soudure (6, 7) sont séparées par une distance de 4 à 10 mm, de préférence 8 mm environ. 2. Press according to claim 1 characterized in that the two welding electrodes (6, 7) are separated by a distance of 4 to 10 mm, preferably about 8 mm. 3. Presse selon la revendication 2 caractérisée en ce que le fil de séparation (8) est équidistant des deux électrodes de soudure (6, 7). 3. Press according to claim 2 characterized in that the separation wire (8) is equidistant from the two welding electrodes (6, 7). 4. Presse selon la revendication 1 caractérisée en ce que pendant l'utilisation les deux électrodes de soudure (6, 7) sont raccordées en permanence à une source de courant électrique tandis que le fil de séparation (8) est raccordé à une source de courant électrique seulement pendant la fermeture de la presse simultanément à 1 'exécu- tion de la soudure par les électrodes de soudure (6, 7).  4. Press according to claim 1 characterized in that during use the two welding electrodes (6, 7) are permanently connected to a source of electric current while the separation wire (8) is connected to a source of electric current only during the closing of the press simultaneously with the execution of the welding by the welding electrodes (6, 7).
FR8320940A 1983-12-28 1983-12-28 Welding and separating press for bags made of weldable plastic Pending FR2557500A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8320940A FR2557500A1 (en) 1983-12-28 1983-12-28 Welding and separating press for bags made of weldable plastic

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8320940A FR2557500A1 (en) 1983-12-28 1983-12-28 Welding and separating press for bags made of weldable plastic

Publications (1)

Publication Number Publication Date
FR2557500A1 true FR2557500A1 (en) 1985-07-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
FR8320940A Pending FR2557500A1 (en) 1983-12-28 1983-12-28 Welding and separating press for bags made of weldable plastic

Country Status (1)

Country Link
FR (1) FR2557500A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0225570A2 (en) * 1985-12-03 1987-06-16 E.I. Du Pont De Nemours And Company Process for thermal separation of a two-layer or multilayer film
GB2275442A (en) * 1993-02-25 1994-08-31 Kwonnie Electrical Products Lt Vacuum sealing plastics bags
EP0995683A1 (en) * 1998-09-29 2000-04-26 Arkmount Systems Inc. Heatsealing and cutting mechanisms and container forming apparatus incorporating the same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3234072A (en) * 1962-06-27 1966-02-08 Mercury Heat Sealing Equipment Forming and sealing packages
FR1527028A (en) * 1967-04-03 1968-05-31 Taylor Ltd C F Welding and cutting head for wrapping heat-shrinkable sheet objects
US3422596A (en) * 1965-06-07 1969-01-21 Grace W R & Co Heat sealing apparatus
US3687789A (en) * 1970-04-08 1972-08-29 Telesonic Packaging Corp Heat-sealing apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3234072A (en) * 1962-06-27 1966-02-08 Mercury Heat Sealing Equipment Forming and sealing packages
US3422596A (en) * 1965-06-07 1969-01-21 Grace W R & Co Heat sealing apparatus
FR1527028A (en) * 1967-04-03 1968-05-31 Taylor Ltd C F Welding and cutting head for wrapping heat-shrinkable sheet objects
US3687789A (en) * 1970-04-08 1972-08-29 Telesonic Packaging Corp Heat-sealing apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0225570A2 (en) * 1985-12-03 1987-06-16 E.I. Du Pont De Nemours And Company Process for thermal separation of a two-layer or multilayer film
EP0225570A3 (en) * 1985-12-03 1989-02-01 E.I. Du Pont De Nemours And Company Process for thermal separation of a two-layer or multilayer film
GB2275442A (en) * 1993-02-25 1994-08-31 Kwonnie Electrical Products Lt Vacuum sealing plastics bags
EP0995683A1 (en) * 1998-09-29 2000-04-26 Arkmount Systems Inc. Heatsealing and cutting mechanisms and container forming apparatus incorporating the same

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