EP0593748B1 - Procede de conditionnement de marchandises sous vide et machine de conditionnement sous vide - Google Patents

Procede de conditionnement de marchandises sous vide et machine de conditionnement sous vide Download PDF

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Publication number
EP0593748B1
EP0593748B1 EP93911720A EP93911720A EP0593748B1 EP 0593748 B1 EP0593748 B1 EP 0593748B1 EP 93911720 A EP93911720 A EP 93911720A EP 93911720 A EP93911720 A EP 93911720A EP 0593748 B1 EP0593748 B1 EP 0593748B1
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EP
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Prior art keywords
vacuum
chamber
vacuum chamber
frequency
evacuation
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Revoked
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EP93911720A
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German (de)
English (en)
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EP0593748A1 (fr
Inventor
Bruno Landolt
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Inauen Maschinen AG
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Inauen Maschinen AG
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
    • B65B31/02—Filling, closing, or filling and closing, containers or wrappers in chambers maintained under vacuum or superatmospheric pressure or containing a special atmosphere, e.g. of inert gas

Definitions

  • the present invention relates to a method for packaging goods under vacuum, in which the goods, which are still in an open envelope, are placed in the interior of a vacuum chamber, in which the chamber is then evacuated and in which the evacuation is ended and the Cover of the good is closed as soon as the desired negative pressure has been reached.
  • the end of the evacuation of the packaging chamber is brought about in such a way that the packaging space is evacuated during a specific, predetermined and set period of time.
  • the length of this time period results from the experience of the person operating the machine.
  • This can, however significant problems arise.
  • One of these problems is related to the fact that the packaged goods contain moisture. It can happen that different pieces of the same packaging, for example meat, have different amounts of moisture. After most of the air has been extracted from the packaging room, moisture begins to escape from the packaging. This is also sucked out of the vacuum chamber as steam by the vacuum pump. The vacuum in the packaging room has already reached the required value, but because the vacuum pump is still running, only moisture is removed from the goods. This only loses weight as the pump continues to run, which is undesirable.
  • the object of the present invention is to provide a method in which the end of the evacuation can be brought about depending on the peculiarities of the piece of goods to be packed in the machine.
  • This task is the method of the type mentioned solved according to the invention as defined in the characterizing part of claim 1 or 2.
  • This machine comprises a vacuum chamber 1, which has a lower part 2 and an upper part 3.
  • the lower part 2 is stationary and the upper part 3 can be articulated on the lower part 2 approximately like a lid.
  • the lower part 2 and the upper part 3 can be approximately bowl-shaped.
  • a seal 4 is located between the end edges of the side walls of the lower part 2 and the upper part 3 so that a vacuum can be built up in such a chamber 1.
  • a working line 5 and a measuring line 6 are connected at one end to the interior of the vacuum chamber 1. From the immediately following the vacuum chamber 1 Cut 11 of the working line 5, the output of a ventilation valve 7 is connected, the input 8 opens into the surrounding atmosphere.
  • a shut-off valve 10 is interposed in the working line 5 in such a way that one of the mouths of this valve 10 is connected to the first section 11 of the working line 5. The opposite mouth of the shut-off valve 10 is connected to a vacuum pump 13 via a second section 12 of the working line 5. This can be a rotary vane vacuum pump, for example.
  • the machine further comprises a three-way valve 15.
  • the switchable connection 16 of this valve 15 is connected to a vacuum sensor 17.
  • One of the connectable connections 18 of the directional control valve 15 is connected to the vacuum pump 13 via a line 19.
  • the other end of the measuring line 6 is connected to the second of the connectable connections 20.
  • the slide of the directional valve 15 is in a position in which the switchable connection 16 of the valve 15 is connected in terms of flow with the second connectable connection 20 of the directional valve 15.
  • This position of the slide of the directional control valve 15 is shown in the accompanying drawing.
  • the valve spool is in its right position.
  • the vacuum sensor 17 is in this position of the valve slide on the measuring line 6 and thus also connected to the interior of the vacuum chamber 1.
  • the vacuum sensor 17 is a piezoresistive cell, which measures the absolute pressure relative to the vacuum. At 0Pa (0bar), i.e. with absolute vacuum, the measuring cell 17 supplies a voltage of 0mV. At ambient pressure, i.e. at approx. 105 Pa (1 bar), the measuring cell 17 supplies a voltage of approx. 100 mV. This voltage is a DC voltage, the level of which, as explained, depends on the level of the measured vacuum.
  • An electronic circuit arrangement 21 is connected to the electrical output of the vacuum sensor 17, which is indicated schematically in the accompanying drawing only as a block.
  • a display unit 22 is connected to the measurement output of this circuit arrangement 21 and indicates the size of the vacuum in the form of digits.
  • a line 23, which serves to actuate the shut-off valve 10, is connected to one of the working outputs of the circuit arrangement 21.
  • a further line 24, which is connected to a corresponding output of the circuit arrangement 21, is used to actuate the ventilation valve 7.
  • the directional control valve 15 can also be controlled via a line 25 through the circuit arrangement 21, this line 25 being connected to a relevant output of the circuit arrangement 21.
  • the electrical voltage continuously output by the vacuum sensor 17 is converted into a continuous sequence or series of rectangular pulses.
  • This pulse sequence thus has a certain frequency.
  • the conversion is carried out in such a way that the frequency of the pulses is proportional to the magnitude of the output voltage of the vacuum sensor 17 and thus also to the absolute pressure. If the level of the output voltage from the vacuum sensor 17 changes, then the frequency of the pulse sequence also changes accordingly.
  • Such pulse sequences are delivered to further sections of the circuit arrangement 21, where they are evaluated and where they can be used to control the operation of the machine.
  • Values which correspond to the individual values of the negative pressure in the vacuum chamber 1 are stored in the memory of the circuit arrangement 21. These values are stored as information about frequencies which correspond to the individual values of the negative pressure.
  • Time window Z or gate times are generated in the circuit arrangement 21. These represent time periods during which pulse sequences are passed on in the circuit arrangement 21.
  • the circuit arrangement 21 is also designed such that the length of these time windows or gate times can be changed.
  • the time windows or gate times are generated at time intervals T.
  • the circuit arrangement 21 is also designed such that the time interval T between two successive time windows can be changed.
  • the number of pulses of the respective frequency, which are transmitted during the respective time window serves, among other things, to indicate the size of the negative pressure in the vacuum chamber 1.
  • the conversion of the output voltage of the vacuum sensor 17 into a pulse train, the frequency in the respective pulse train being in a certain relation to the level of the vacuum in the chamber 1, enables at least two types of evacuation of the chamber 1, in which the termination of the evacuation is better Relation to the piece of packaged goods that is located in the vacuum chamber 1.
  • the chamber 1 In the first type of evacuation, the chamber 1 is evacuated until a predetermined setpoint value for the negative pressure is reached.
  • the chamber 1 is evacuated until moisture or vapors begin to get out of the product to be packaged.
  • the vacuum value at which the evacuation is to be ended is selected and defined as a comparison value or as a comparison frequency from the memory of the circuit arrangement 21.
  • the frequency of the pulse series, which result from the signals supplied by the vacuum sensor 17 is compared with the selected value of the comparison frequency in the circuit arrangement 21. As soon as the signal emitted by the vacuum sensor 17 has a frequency which is equal to the comparison frequency, the evacuation is stopped.
  • the time windows Z are generated.
  • the time interval T between two successive time windows Z is of no particular importance.
  • the time windows Z are necessary so that patterns of the signal emitted by the vacuum sensor 17 can arise, which are to be checked.
  • the test circles can contain counters, for example.
  • the frequency of the signal pattern passed during the time window Z is compared with the comparison frequency. If the frequency of the transmitted signal pattern equals the comparison frequency, this means that the preselected vacuum in chamber 1 has been reached and that the evacuation of chamber 1 via line 23 can be stopped.
  • the shut-off valve 10 is closed, whereby the chamber 1 is decoupled from the vacuum pump 13.
  • the ventilation valve 7 is automatically opened by the circuit arrangement 21 via the line 24.
  • the chamber 1 is filled with air, it can be opened, etc.
  • the second type of evacuation is based on the knowledge that the pressure in the vacuum chamber 1 initially decreases practically continuously during the evacuation, if only air is sucked out of the vacuum chamber 1 alone.
  • the moisture begins to escape from the material of the product to be packaged or to evaporate on the surface of the product.
  • the amount of steam which is formed from the moisture is different from the amount of the air previously extracted from the vacuum chamber 1.
  • the development of steam takes place relatively quickly, so that the pressure in the chamber 1, when steam forms, decreases more slowly than when air is drawn off alone. The pressure in the chamber 1 therefore no longer decreases continuously, not as quickly as before, during the escape of the moisture from the product.
  • the pressure in the vacuum chamber 1 initially decreases practically linearly in the present case if only air is sucked out of the chamber 1.
  • This section of a pump curve is practically linear and has a certain slope. After most of the air has been drawn out of the chamber 1, steam begins to escape from the packaging product, with the result that the steepness of the pump curve during this pumping phase becomes smaller than before.
  • Such a course of the pump curve can be monitored with the aid of electronic circuitry.
  • the patterns of the signal emitted by the vacuum sensor 17 also arrive in the present case from the latter during the time window Z to the test circles, where the frequency of the signal pattern is determined. These test circles are supplemented by circles which can save the result of the test of a signal pattern until the test of the car following signal pattern is completed.
  • the results of testing these two signal patterns are then compared to determine the difference in frequency between these two signal patterns. This difference gives the steepness of the section in question the pump curve. As long as the successive differences are the same, it is the practically linear section of the pump curve, ie only air is extracted. As soon as the difference between two signal evaluations becomes smaller than the previously determined difference, the pump curve flattens and this means that only steam and moisture are removed from the product.
  • the evacuation can be stopped, which is carried out in the manner already described above.
  • the frequency of the pulses which are generated in the circuit arrangement 21 on the basis of the voltage output by the vacuum sensor 17 depends on the size of the negative pressure in the vacuum chamber 1.
  • the decrease in pressure in the vacuum chamber 1 causes the frequency of the pulses to decrease with decreasing pressure. This means that the number of pulses per unit of time decreases. Furthermore, this means that during the time window of constant length, a decreasing number of pulses are transmitted as the pressure in the vacuum chamber 1 decreases, i.e. the frequency of the pulse trains decreases.
  • the above-mentioned deviations from the initially steady decrease in pressure in the vacuum chamber 1 are very small and could hardly be indicated by the vacuum sensor 17 in such a way that that these deviations could be used directly to control machine operation.
  • the frequency of the pulses which are generated due to the output voltage from the vacuum sensor 17 is relatively high. It is in the range of kHz. This means that a relatively small change in vacuum in the vacuum chamber 1 corresponds to a relatively large number of pulses. This considerable number of pulses can be detected relatively easily by the circuits mentioned and used to control the operation of the machine.
  • the circuit arrangement 21 is designed such that it causes the welding device to close the product pack via its outputs, that it ends the further evacuation of the vacuum chamber 1 and that it initiates or also carries out measures which enable the vacuum chamber 1 to be opened and emptied.
  • the shut-off valve 10 is reversed via the line 23, so that the vacuum chamber 1 is decoupled from the vacuum pump 13. Thereafter, the ventilation valve 7 can be opened by the circuit arrangement 21, after which the vacuum chamber 1 can be opened and emptied.
  • the vacuum chamber 1 After the vacuum chamber 1 has been filled with new goods to be packed, it is closed again.
  • the ventilation valve 7 is also closed while the shut-off valve 10 is opened.
  • the vacuum chamber 1 is thereby reconnected to the vacuum pump 13 and, in turn, there is again a steady decrease in pressure in the vacuum chamber 1.
  • a further packaging cycle can be carried out in the manner described above.
  • the described mode of operation can be installed in the circuit arrangement 21 in the form of individually specified work programs. The operator then only needs to select a specific program by entering the desired mode of operation of the machine, for example using a keyboard. This operation is then carried out automatically by the machine.
  • the evacuation is not stopped immediately after a flattening in the pump or vacuum curve has occurred, but that it continues to run for a selectable period of time.
  • the easiest way to achieve this is to change the time interval T between two successive time windows Z.
  • the pulses transmitted during the time window are converted in the circuit arrangement 21 into signals which cause the display of a corresponding number in the display device 22.
  • the numbers 0 and 000 in the display device 22 stand for atmospheric pressure in the vacuum chamber 1.
  • the number 999 stands for vacuum in the vacuum chamber 1.
  • the frequency of the measuring pulses is approximately 13 kHz and at ambient pressure approximately 110 kHz.
  • the respective number between 0 or 000 and 999 thus corresponds to a certain number of measuring pulses, which is passed through during the time window. If you subtract 13kHz from 110kHz and then divide this result by 999, then about 97Hz corresponds to a digit between 000 and 999.
  • the display in the display device 22 is coupled to the frequency of the pulse signal from the vacuum sensor 17, it can also be visually monitored on the display device 22 how the size of the vacuum in the vacuum chamber 1 changes.
  • the first type of calibration in which the size of the ambient pressure is taken into account, is carried out with the lid 3 of the vacuum chamber 1 open. This calibration can be carried out each time the machine is switched on or after each packaging cycle.
  • the vacuum sensor 17 is connected via the directional valve 15, the slide of which is in its right position, and the measuring line 6 to the inside of the open vacuum chamber 1.
  • the shut-off valve 10 is closed or it is closed for this purpose.
  • the vacuum sensor 17 supplies an electrical voltage, the magnitude of which is constant because the pressure in the vacuum chamber 1 is constant and is equal to the ambient pressure.
  • the circuit arrangement 21 generates a certain number of pulses on the basis of the output voltage of the vacuum sensor 17, this number of pulses being constant because the pressure is constant.
  • the circuit arrangement 21 automatically ensures the relationship between the number of pulses supplied by the vacuum sensor and the numbers 0 and 000 in the display device 22. Should the display device 22 display a number other than 000 at the beginning of this calibration, then the width of the time window T or the size of the gate time is changed by the circuit arrangement 21 itself as part of this calibration. If the number 000 in the display 22 cannot be reached during a certain time, it can be assumed that, for example, the vacuum sensor 17 or the circuit arrangement 21 are defective and an error message appears.
  • the maximum achievable vacuum is determined.
  • This calibration is expediently carried out after each packaging cycle.
  • the slide of the directional control valve 15 is adjusted in such a way that the switchable mouth 16 of the valve 15 is connected in terms of flow with the first switchable connection 18 of the valve 15 is.
  • the vacuum sensor 17 is connected to the vacuum pump 13 via the auxiliary line 19.
  • the shut-off valve 10 is closed during this calibration, so that the vacuum pump 13 is only connected to the vacuum sensor 17. After a few seconds, the line 19 should have been evacuated to the vacuum sensor 17 and after this period the measurement of the vacuum by the vacuum sensor 17 begins.
  • the maximum vacuum that can be achieved by a vacuum pump of the type mentioned here can be 0.5 ⁇ 10 2 Pa (0.5mb). There is still a tolerable range for the vacuum pump during which it is still considered good. The limit of this tolerance range can be 3 to 5 ⁇ 10 2 Pa (3 to 5mb). If the vacuum generated during this calibration does not reach these values, an error message is issued.
  • This calibration of the vacuum pump can be carried out because the values or frequencies corresponding to the individual stages of vacuum are stored in the circuit arrangement 21, as has already been explained. During this calibration, the circuit arrangement 21 compares the signals supplied by the vacuum sensor 17 in the manner already described with the stored vacuum values.
  • the circuit arrangement 21 also tries the relationship in this case between the signal supplied by the vacuum sensor 17 and the number 9 or 999 in the display device 22 automatically. If this is not possible for a few seconds, an error message is issued automatically.

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  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Vacuum Packaging (AREA)
  • Examining Or Testing Airtightness (AREA)

Claims (14)

  1. Procédé d'emballage de marchandises sous vide, suivant lequel les marchandises, qui se trouvent dans une enveloppe encore ouverte, sont placées à l'intérieur d'une chambre à vide (1), suivant lequel l'air est alors évacué de la chambre et suivant lequel l'évacuation de l'air est terminée et l'enveloppe contenant les marchandises est fermée dès que la dépression souhaitée a été atteinte, caractérisé en ce que le signal de sortie d'un détecteur de vide (17) raccordé à la chambre à vide (1) est converti en une série d'impulsions, en ce que la fréquence de cette série d'impulsions est couplée au niveau de vide régnant dans la chambre à vide, en ce que la fréquence de la série d'impulsions peut être comparée à des fréquences qui sont prédéterminées pour les différentes valeurs du vide dans la chambre (1) et en ce que l'évacuation de l'air de la chambre (1) est terminée lorsque la fréquence de la série d'impulsions est égale à chacune des fréquences d'impulsions prédéterminées qui correspond au niveau de vide souhaité à l'intérieur de l'enveloppe.
  2. Procédé d'emballage de marchandises sous vide, suivant lequel les marchandises, qui se trouvent dans une enveloppe encore ouverte, sont placées à l'intérieur d'une chambre à vide (1), suivant lequel l'air est alors évacué de la chambre et suivant lequel l'évacuation de l'air est terminée et l'enveloppe contenant les marchandises est fermée dès que la dépression souhaitée a été atteinte, caractérisé en ce que le signal de sortie d'un détecteur de vide (17) raccordé à la chambre à vide (1) est converti en une série d'impulsions, en ce que la fréquence de cette série d'impulsions est couplée au niveau de vide régnant dans la chambre à vide, en ce que l'allure de la variation de la pression dans la chambre à vide et dans l'enveloppe, lorsque l'air est évacué de celles-ci, est surveillée et en ce que l'évacuation de l'air est terminée lorsqu'une déviation d'une allure de variation prédéterminée est constatée.
  3. Procédé suivant la revendication 2, caractérisé en ce que l'évacuation de l'air est terminée lorsque la pression dans la chambre à vide et dans l'enveloppe diminue plus lentement qu'au cours de la phase d'évacuation de l'air précédente.
  4. Procédé suivant la revendication 1 ou 2, caractérisé en ce que le signal de sortie du détecteur de vide (17) est transmis, en vue d'un traitement ultérieur pendant des fenêtres temporelles (Z) ou des temps de porte ou des temps de mesure, en ce qu'un intervalle de temps (T) sépare deux fenêtres temporelles (Z) successives, en ce que la longueur des fenêtres (Z) et/ou des intervalles de temps (T) peut être réglable et en ce que les signaux de sortie du détecteur de vide (17) transmis pendant les fenêtres temporelles (Z) sont convertis en une série d'impulsions.
  5. Procédé suivant la revendication 4, caractérisé en ce que les impulsions transmises pendant une fenêtre temporelle (Z) représentent un motif de signal, en ce que le nombre d'impulsions est déterminé dans les motifs de signal qui sont transmis pendant deux fenêtres temporelles (Z) successives, en ce que le motif de signal qui est transmis pendant la première ou précédente fenêtre temporelle est enregistré jusqu'à ce que le motif de signal pour la fenêtre temporelle suivante ou deuxième soit déterminé, en ce que ces deux motifs de signal sont comparés l'un à l'autre afin de déterminer, à titre de variation, la différence entre le nombre d'impulsions présentes dans ces deux motifs de signal, la différence d'impulsions indiquant la raideur du segment concerné de l'allure de pompage ou d'une courbe de pompage.
  6. Procédé suivant la revendication 5, caractérisé en ce que la différence d'impulsions d'une paire de motifs de signal successifs est enregistrée jusqu'à ce que la différence d'impulsions pour la paire suivante de motifs de signal successifs soit établie et en ce que ces différences d'impulsions sont comparées les unes aux autres afin de pouvoir établir la grandeur de la différence entre les deux différences d'impulsions successives.
  7. Procédé suivant la revendication 4, caractérisé en ce que l'intervalle de temps (T) entre deux fenêtres temporelles (Z) peut être choisi dans de larges limites, par exemple jusqu'à 5 s, afin que l'évacuation de l'air ne soit pas interrompue juste après l'apparition d'une déviation par rapport à une allure prédéterminée de la courbe de pompage.
  8. Procédé suivant la revendication 1 ou 2, caractérisé en ce qu'un premier type d'étalonnage est effectué afin de déterminer la pression ambiante, cet étalonnage pouvant être effectué soit au début d'une série de cycles d'emballage, soit après chaque cycle d'emballage.
  9. Procédé suivant la revendication 1 ou 2, caractérisé en ce qu'un deuxième type d'étalonnage est effectué au cours duquel le niveau de vide maximal pouvant être atteint est déterminé et en ce que ce deuxième type d'étalonnage peut être effectué avant chaque cycle d'emballage.
  10. Machine d'emballage sous vide destinée à l'exécution du procédé suivant la revendication 1, comprenant une chambre à vide (1), une valve d'arrêt (10) entre la chambre à vide (1) et une pompe à vide (13), un détecteur de vide (17) qui peut être raccordé à la chambre à vide et un indicateur (22) pour afficher le niveau de vide régnant dans la chambre à vide, caractérisée en ce qu'entre le détecteur de vide (17) et l'indicateur (22) est disposé un montage de circuit électronique (21) configuré de telle sorte que, dans celui-ci, la tension électrique fournie par le détecteur de vide (17) soit convertie en une série d'impulsions, la fréquence de ces impulsions étant en relation avec la grandeur de la tension de sortie du détecteur de vide (17), en ce que le montage de circuit (21) comporte des mémoires dans lesquelles sont enregistrées des fréquences qui correspondent aux différents niveaux de vide dans la chambre à vide et en ce que le montage de circuit (21) comporte en outre des circuits grâce auxquels la fréquence de la série d'impulsions provenant du détecteur de vide (17) peut être comparée avec chacune des fréquences enregistrées qui correspond au vide souhaité dans la chambre (1) et grâce auxquels l'évacuation de l'air peut être terminée lorsque la fréquence de la série d'impulsions concorde avec la fréquence sélectionnée dans la mémoire.
  11. Machine d'emballage sous vide destinée à l'exécution du procédé suivant la revendication 2, comprenant une chambre à vide (1), une valve d'arrêt (10) entre la chambre à vide (1) et une pompe à vide (13), un détecteur de vide (17) qui peut être raccordé à la chambre à vide et un indicateur (22) pour afficher le niveau de vide régnant dans la chambre à vide, caractérisée en ce qu'entre le détecteur de vide (17) et l'indicateur (22) est disposé un montage de circuit électronique (21) configuré de telle sorte que, dans celui-ci, la tension électrique fournie par le détecteur de vide (17) soit convertie en une série d'impulsions, la fréquence de ces impulsions étant en relation avec la grandeur de la tension de sortie du détecteur de vide (17), et en ce que le montage de circuit (21) comporte des circuits grâce auxquels il est possible de surveiller si et, si c'est le cas, comment la fréquence varie d'une série d'impulsions à l'autre, et grâce auxquels l'évacuation de l'air peut être terminée lorsqu'une déviation est constatée dans la chambre à vide ou dans l'enveloppe par rapport à une allure prédéterminée de diminution de pression.
  12. Machine d'emballage suivant la revendication 10 ou 11, caractérisée en ce que le montage de circuit (21) est configuré de telle sorte que la mesure proprement dite ou respective du vide a lieu pendant une fenêtre temporelle (Z) ou un temps de porte, en ce que les fenêtres temporelles (Z) peuvent être générées dans des intervalles de temps et en ce que le nombre d'impulsions qui peuvent être transmises pendant une fenêtre temporelle (Z) peut également servir à indiquer le niveau de vide dans la chambre à vide.
  13. Machine suivant la revendication 11, caractérisée en ce que le montage de circuit (21) comporte des mémoires qui peuvent enregistrer le résultat de l'examen d'un motif de signal jusqu'à ce que l'examen du motif de signal suivant soit terminé.
  14. Machine d'emballage suivant la revendication 13, caractérisée en ce que le montage de circuit (21) est configuré de manière à pouvoir vérifier si la fréquence des impulsions varie constamment ou non dans des séries d'impulsions successives et en ce que le montage de circuit (21) est configuré en outre de manière à pouvoir signaler la variation de la fréquence d'impulsions et la transmettre à d'autres parties de la machine lorsque la fréquence d'impulsions ne varie pas constamment.
EP93911720A 1992-05-15 1993-05-14 Procede de conditionnement de marchandises sous vide et machine de conditionnement sous vide Revoked EP0593748B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH1563/92A CH685010A5 (de) 1992-05-15 1992-05-15 Verfahren zum Verpacken von Gut unter Vakuum und Vakuum-Verpackungsmaschine.
CH1563/92 1992-05-15
PCT/CH1993/000122 WO1993023289A1 (fr) 1992-05-15 1993-05-14 Procede de conditionnement de marchandises sous vide et machine de conditionnement sous vide

Publications (2)

Publication Number Publication Date
EP0593748A1 EP0593748A1 (fr) 1994-04-27
EP0593748B1 true EP0593748B1 (fr) 1996-12-27

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Application Number Title Priority Date Filing Date
EP93911720A Revoked EP0593748B1 (fr) 1992-05-15 1993-05-14 Procede de conditionnement de marchandises sous vide et machine de conditionnement sous vide

Country Status (7)

Country Link
US (1) US5528880A (fr)
EP (1) EP0593748B1 (fr)
JP (1) JPH06511457A (fr)
AT (1) ATE146738T1 (fr)
CH (1) CH685010A5 (fr)
DE (1) DE59304882D1 (fr)
WO (1) WO1993023289A1 (fr)

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US6403176B1 (en) 1993-12-08 2002-06-11 Andre Patouraux Packaging laminate for bags
BE1007847A3 (fr) * 1993-12-08 1995-11-07 Madpack Servicos Internacionai Concept d'inertage comprenant un procede, une machine, des complexes souples etanches et des valves pour l'inertage de produits sensibles a l'humidite ou a l'oxygene.
NL9402000A (nl) * 1994-11-29 1996-07-01 Sara Lee De Nv Werkwijze voor het evacueren van een met korrelig materiaal gevuld vacuümpak en inrichting voor het uitvoeren van de werkwijze.
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DE59304882D1 (de) 1997-02-06
JPH06511457A (ja) 1994-12-22
CH685010A5 (de) 1995-02-28
WO1993023289A1 (fr) 1993-11-25
EP0593748A1 (fr) 1994-04-27
ATE146738T1 (de) 1997-01-15
US5528880A (en) 1996-06-25

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