EP3630634B1 - Sac à valve se prêtant au vide - Google Patents

Sac à valve se prêtant au vide Download PDF

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Publication number
EP3630634B1
EP3630634B1 EP18730249.2A EP18730249A EP3630634B1 EP 3630634 B1 EP3630634 B1 EP 3630634B1 EP 18730249 A EP18730249 A EP 18730249A EP 3630634 B1 EP3630634 B1 EP 3630634B1
Authority
EP
European Patent Office
Prior art keywords
wall material
valve bag
closure side
inner layer
closure
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.)
Active
Application number
EP18730249.2A
Other languages
German (de)
English (en)
Other versions
EP3630634A1 (fr
EP3630634C0 (fr
Inventor
Waldemar REPP
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.)
Bischof and Klein SE and Co KG
Original Assignee
Bischof and Klein SE and Co KG
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 Bischof and Klein SE and Co KG filed Critical Bischof and Klein SE and Co KG
Publication of EP3630634A1 publication Critical patent/EP3630634A1/fr
Application granted granted Critical
Publication of EP3630634C0 publication Critical patent/EP3630634C0/fr
Publication of EP3630634B1 publication Critical patent/EP3630634B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D33/00—Details of, or accessories for, sacks or bags
    • B65D33/01—Ventilation or drainage of bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/14—Valve bags, i.e. with valves for filling
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B2160/00—Shape of flexible containers
    • B31B2160/20—Shape of flexible containers with structural provision for thickness of contents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B—MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31B70/00—Making flexible containers, e.g. envelopes or bags
    • B31B70/74—Auxiliary operations
    • B31B70/81—Forming or attaching accessories, e.g. opening devices, closures or tear strings
    • B31B70/84—Forming or attaching means for filling or dispensing contents, e.g. valves or spouts
    • B31B70/85—Applying patches or flexible valve inserts, e.g. applying film-like valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D31/00—Bags or like containers made of paper and having structural provision for thickness of contents
    • B65D31/08—Bags or like containers made of paper and having structural provision for thickness of contents with block bottoms

Definitions

  • the invention relates to a ventable valve bag with a wall material which comprises at least one inner layer which is permeable to gas and impermeable to the filling material and at least one outer layer which is impermeable to gas.
  • the valve bag has two closure sides, with a first closure side being formed by closing the bag and a second closure side being arranged facing away from the first closure side.
  • a space is formed between a portion of the inner sheet defining a bag interior and the outer sheet.
  • valve bag is about out EP 2 186 741 B1 known. It is primarily used for storing and transporting powdery or granular or pourable and free-flowing goods such as cement or animal feed.
  • the valve bag can be vented so that the air introduced into the bag interior during the filling of the valve bag can then escape from the latter.
  • the valve bag has a ventilation opening in the area of a longitudinal edge, up to which a main surface of the valve bag extends and which is designed as a folded edge, together with an interrupted longitudinal sealing seam.
  • its structure is weakened by the ventilation opening and the necessary interrupted longitudinal sealing seam in a highly stressed area, with the folding of the wall material through 180° leading to considerable stretching or compression of the wall material layers.
  • the ventilation effect is limited by the fact that when the valve bag is stored, when the rule several valve sacks lie on top of each other with their main sides, an outlet opening for the air is blocked by the weight of any valve sacks lying on top. Multiple deflection of the air flow between the space and the environment also results in high resistance to ventilation.
  • the object of the present invention is to increase the stability of a ventable valve bag and at the same time to design the venting process to be as reliable as possible.
  • a ventilation channel is arranged on at least one closure side of the valve bag between the inner layer and the outer layer of a wall material area. This opens out from a wall material edge section in such a way that the intermediate space can be vented to the environment through it.
  • the air that has entered the intermediate space from the interior of the bag through the inner layer is discharged through the ventilation channel on the closure side.
  • the sack interior is the space inside the closed valve sack and delimited by the wall material. After filling the valve bag, this contains the pourable and free-flowing filling material.
  • a closure side is the side of the valve bag, through the formation of the bag is closed, with a second closure side is arranged parallel to the former at the opposite end of the valve bag after the closure of the valve bag.
  • the ventilation channel is arranged in a region of the same multi-layer wall material between its inner and outer layer and thus not between an outer layer of a first wall material section and the inner layer of a further wall material section folded against it.
  • the inner layer and the outer layer of the closure side wall material are unconnected in a region extending from the edge of the wall material to the edge of the closure side.
  • the wall material extends essentially over a surface area, with its thickness being many times smaller than the length of its connected wall material edge on the closure side.
  • the wall material is formed from a multi-layer plastic film.
  • the wall material edge defines an area of the wall material whose width, notwithstanding the vent channel, corresponds to the thickness of the wall material and which bounds an inner and an outer major surface of the wall material.
  • the wall material edge portion is a continuous part of the wall material edge, the width of the wall material edge portion being equal to that of the wall material edge.
  • valve bag according to the invention has the at least one ventilation channel on the closure side, the stability of the valve bag is improved.
  • the closure sides are the least stressed sides of a valve bag and evacuating the air on this side results in the greatest possible stability. Both during Both during filling and during storage, any critical stresses act on the wall material, which forms the generally larger main and/or secondary sides of the valve bag.
  • the arrangement of the ventilation channel also enables a particularly process-reliable ventilation of the valve bag insofar as the valve bag can still be ventilated when it is filled and closed and stored stacked. Due to the design of the venting channel according to the invention, the valve bag can continue to vent even during such storage.
  • the at least one closure side is designed by folding the wall material. This is the closure side on which the ventilation channel is arranged.
  • the folding of the wall material to close the valve bag leads to increased stability and reliability of the valve bag on the closure side.
  • the folding compensates for the structural weakening of the wall material by the ventilation channel.
  • the same closure side is preferably designed by folding the wall material in the manner of a cross bottom.
  • a cross bottom is characterized by the fact that, starting from an open valve sack, two opposing corner tucks are first folded in the direction of the sack interior. These corner impacts are not in contact with each other. Subsequently, side flaps are formed, in particular from wall material areas adjoining the main surfaces of the valve bag, by these wall material areas also being folded. As a result, parts of the side folds lie on top of each other and on the ones below lying corner tucks, whereby the valve bag is reliably closed after appropriate fixation.
  • the cross bottom increases the stability of the valve bag in the area of the ventilation channel. An unintentional closure of the ventilation channel caused by a build-up of tension in the wall material on the closure side is prevented, as a result of which both the valve bag as such and its ventilation are particularly reliable.
  • a further advantage of this preferred embodiment is the possibility of simple air routing between the space and the environment, since the sections of the wall material forming the closure side are only folded by 90° compared to the wall material sections forming the main and secondary sides of the valve bag. The air flow is deflected only once at this folded edge, which reduces its resistance and makes ventilation more reliable.
  • the ventilation duct is delimited by an inner layer, which is arranged both on the closure side and delimits the interior of the sack, as a result of which the interior can be vented directly into a ventilation duct on the floor, for example.
  • the ventilation channel is particularly preferably formed in an outer side flap forming the closure side.
  • the outer side tuck is that of the two side tucks that borders the inner side tuck opposite the bag interior. It is referred to as outer regardless of a cover sheet that may be fixed to the closure side. Due to the fact that the ventilation channel runs in the wall material forming the outer side flap, the air from the intermediate space is conveyed into the environment in a particularly simple manner, since the ventilation duct cannot be closed as a function of the load by any tension in an overlying layer of wall material.
  • the outer side flap has the wall material edge section in such a way that it borders on the surroundings. Due to the fact that the wall material edge section with the discharge opening is on the outside, the air is in the environment immediately after discharge from the ventilation duct. This in turn allows conventional and particularly stable fixing of the closure side, in which the side flaps are glued to the corner flaps or the inner side flap with their undersides facing the interior of the bag. It also minimizes resistance to airflow by not resisting airflow through another restricted cross-section. If the outer side fold is only glued along an adhesive strip, which runs along the edge of the side fold adjoining the surroundings, the ventilation channel extends over a length that corresponds to the width of the wall material edge strip or the adhesive strip. If any coverings of the side flap are present, starting from edge strips of wall material, the ventilation channel is lengthened accordingly.
  • the valve bag can be produced by folding a tubular wall material on the closure side, which is fixed by a longitudinal seam connecting two sides of the wall material.
  • This longitudinal seam extends from one wall material edge on the closure side to the other wall material edge on the closure side and preferably runs over one of the main surfaces of the valve bag for reasons of stability. Due to the better printed image, the main surface of the sack facing away from the longitudinal seam is preferably provided with front-side printing which is not disturbed by any seam and which is visible from above during conventional storage and transport of the sack.
  • the cross-bottom is preferably designed in such a way that the longitudinal seam extends over the inner side flap of the at least one closure side.
  • the side flap encompassing the ventilation channel is folded downwards, starting from the horizontal front main surface, to the rear main surface with the longitudinal seam.
  • the opening of the ventilation channel is directed downwards, so that the ingress of water via capillary action is made more difficult or prevented by the opposite gravity.
  • a central longitudinal axis of the ventilation channel preferably runs essentially parallel to a narrow edge of the at least one closure side.
  • the closure side is delimited by two opposing narrow edges and two broad edges adjoining them.
  • the narrow edges lie between the closure side and a secondary side and lie on the lines at which the corner folds of the closure side connect to a secondary side.
  • the wide edge delimits the closure side from a main side of the valve bag.
  • the central longitudinal axis of the venting channel has the same distance to two venting channel boundary lines at every point within the venting channel, which border the venting channel on both sides transversely to the direction of the air flow.
  • the ventilation channel can also be delimited by the parts of the outer side fold which do not border on the surroundings and through which the side fold rests on the corner folds.
  • the central longitudinal axis of the venting channel intersects that of the wide edge, up to which the venting channel extends on the closure side, between two auxiliary points arranged on the wide edge, which are shifted in a direction parallel to the narrow edge by an imaginary displacement of the two boundary points of the wall material edge section.
  • the boundary points form the intersection of the wall material edge and vent boundary lines.
  • the central longitudinal axis does not necessarily intersect the wall material edge portion.
  • venting duct ensures that the path for the air flow from the intermediate space to the edge section of the wall material is as short as possible.
  • venting of the valve bag can be implemented in a particularly process-reliable manner.
  • the inner ply and the outer ply are joined together on the closure side along an edge strip of wall material which is adjacent to the edge of wall material.
  • the inner layer and the outer layer are only unconnected in a part of the edge strip of wall material which is immediately adjacent to the edge portion of wall material.
  • the wall material edge strip is a section of the wall material which adjoins the complete closure-side wall material edge and has a preferably constant extension in a direction away from the wall material edge.
  • the outlet opening of the ventilation channel lies between the inner layer and the outer layer in the wall material edge section. This outlet opening and the outermost part of the venting channel adjoining it are delimited laterally, ie at the venting channel boundary lines, by the connection of inner layer and outer layer in the edge strip of wall material.
  • This extensive connection of the inner and outer layers in the edge strip of wall material is preferably produced before the closure side is folded.
  • the inner layer and the outer layer are connected to one another over a predominant part of the circumference.
  • the connection may be in the form of a plurality of spaced connection points or in the form of a continuous strip of connection. Only that part of the edge strip of wall material through which the ventilation duct runs remains completely unconnected.
  • the inner layer and the outer layer are particularly preferably made of the same material. Because the materials of the inner and outer layers are identical, the material that offers the best properties in terms of stability of the valve bag can be selected for both layers. The risk of interactions between different materials and special requirements when connecting inner and outer layers made of different materials can thus be ruled out. Overall, this in turn can increase the stability of the valve bag.
  • the inner layer and the outer layer are predominantly, i.e. more than 50%, formed from a polyolefin, in particular from polyethylene. This material is characterized by particularly high ductility and impact strength. These properties make the valve bag particularly resilient to environmental influences.
  • the part of the inner layer which delimits the interior of the sack preferably has ventilation openings. These ventilation openings are used to guide the air from the sack interior into the intermediate space.
  • the outer layer of the wall material remains free of openings.
  • the ventilation openings whose cross-section is smaller than the smallest cross-section of the filling material particles, serve to remove air from the interior of the bag as efficiently as possible. Because the number and size of the ventilation openings can be varied over a wide range, a large total ventilation area, which is made up of the cross sections of the existing ventilation openings, on the main and secondary surfaces of the valve bag and good adaptation to different filling materials can be achieved.
  • the vent openings thus enable an increase in the process reliability of venting with different filling goods.
  • the valve bag preferably has spacer elements that span the intermediate space. These spacer elements ensure that the intermediate space has a minimum volume, even if there is no ventilation, and that the outer layer does not rest on a predominant part of the inner layer, which is provided with openings. This makes it easier to evacuate the air from the interior of the bag when ventilation resumes during storage, for example, because the outer layer cannot previously lie flat against the inner layer and thus the necessary spacing of the wall material layers and the transfer of the air into the space between the inner and external position are relieved.
  • the spacer elements are particularly preferably formed by edges of the ventilation openings in the inner layer. Ventilation openings can be formed in the inner layer by punching or the like, the edge of which is shifted in the direction of the outer layer and transverse to the planar extension of the inner layer. If the inner and outer layers are in a tensioned state, the outer layer is only in contact with the edge areas of the inner layer that face it. The process reliability of the ventilation is increased by the spacer elements designed in this way in that they implement the valve effect of the ventilation in a particularly reliable manner. If the pressure in the interior of the bag is higher than in the environment, the outer layer can be lifted against only slight resistance and the air can escape from the interior of the bag and through the ventilation duct to the environment reach.
  • the outer layer adjoining the gap lies on the edge areas of the inner ply, whereby the contact pressure of the layers on each other is increased due to the reduced contact surface of the two and prevents air from flowing into the sack interior.
  • a cover sheet covering the edge section of the wall material is arranged on the at least one closure side.
  • This flat bonded cover sheet forms the ventilation channel.
  • the wall material edge section can be arranged both on a wide edge of the closure side and between the two wide edges. If the wall material edge section is located between the two broad edges, the ventilation channel is extended by an overlying cover sheet from the wall material edge section to an edge of the closure side-top sheet contact area.
  • a cover element is preferably arranged between the at least one closure side and the cover sheet, which cover element extends from the wall material edge section to an edge of the cover sheet.
  • the closure side and the cover sheet are conventionally connected to one another by means of an adhesive applied over the entire surface of their contact surface.
  • the adhesive-free cover element allows the extension of the ventilation channel insofar as it rests on the adhesive between itself and the wall material or between itself and the Cover sheet prevents sections of the wall material and cover sheet from sticking together. It forms an unbonded cavity between the wall material edge section and the edge of the cover sheet in such a way that if there is a sufficient pressure difference between the space and the environment, ventilation takes place through this cavity and the rest of the ventilation channel.
  • cover element enables the use of conventional methods for gluing the cover sheet and closure side while maintaining the process reliability of the ventilation. These in turn reliably stabilize the valve bag on the closure side.
  • the ventilation channel therefore does not have to be formed continuously, which prevents the ingress of insects, moisture or other foreign substances. Without sufficient overpressure, the top and bottom of the ventilation duct can touch each other.
  • the closure side-cover sheet contact surface can have an adhesive recess area on which the cover sheet and the closure side are not glued to extend the ventilation channel.
  • a wall material 4, from which the valve bag 2 is essentially formed, comprises an outer layer 8 that is visible from the outside and an inner layer 6 that abuts and/or adjoins the outer layer 8 on the inside and is 1 is made visible by a partial cut of the main page 28.
  • FIG 12 is a perspective view of an unsealed valve bag blank.
  • This consists of a tubular wall material 4.
  • a bag interior 12 is defined, which in 3 is indicated due to the open state of the valve bag blank.
  • the inner layer 6 is permeable to a gas and impermeable to a filling material which is to be filled into the sack interior 12. This is achieved by a large number of ventilation openings 36 marked by dots (cf.
  • the outer layer 8 which delimits the intermediate space 14 on its side facing the surroundings, is impermeable both to a gas and to the filling material.
  • the gap 14 can extend completely or partially over two main sides 28 and two side sides 30 .
  • the ventable valve bag 2 has an outlet opening 34, in which a venting channel 18 opens out.
  • This ventilation duct 18 connects the intermediate space 14 and the environment, so that air from the intermediate space 14 can reach the environment through the ventilation duct 18 .
  • the outlet opening 34 is located in a wall material edge section 16, in which the inner layer 6 and the outer layer 8 of a wall material region are spaced apart.
  • the closure side 10 of the ventable valve bag 2 is designed by folding the wall material 4 into a cross bottom.
  • This cross bottom has an inner side fold that is visible to a lesser extent on the real valve bag and an outer side fold 20.
  • the wall material edge section 16, in which the opening is located, is part of this outer side fold 20 Cover sheet or the like. Directly to the environment.
  • the ventilation channel 18 extends from the wall material edge section 16 essentially in the direction of its central longitudinal axis 22 to a wide edge 26 of the closure side 10, on which the wall material 4 is folded and on which the outer side flap 20 borders a main side 28.
  • FIG. 3 Figure 12 shows that the inner sheet 6 and the outer sheet 8 are joined together on the closure side along an edge strip of wall material 32 which adjoins the edge of the wall material and has a constant width around the perimeter of the valve bag blank.
  • This closure-side connection of the inner layer 6 and the backsheet 8 is interrupted in the portion of the wall material edge strip 32 which abuts the wall material edge portion 16 to form the orifice 34 at which the inner sheet 6 and the outer sheet 8 are spaced from each other.
  • FIG. 2 shows a closure side 10 of a different embodiment of the valve bag according to the invention.
  • a cover sheet 38 shown transparent, is placed on the closure side 10 shown, the side edge of which essentially corresponds to the narrow edges 24 and the wide edges 26 of the closure side 10 .
  • the cover sheet 38 is glued to the closure side 10
  • the outer side flap 20 does not extend from one broad edge 26 to the opposite one, as a result of which the opening 34 lies between the two broad edges 26 on the closure side 10 . Because the applied cover sheet 38 is glued to the closure side 10, the ventilation channel 18 is formed through the cover sheet from the outlet opening 34 to the broad edge 26 that is closer. In this area, the ventilation channel 18 continues between the cover sheet 38 and the inner side flap outside of the wall material 4 . It is formed by a cover element 40 in the area correspondingly marked with a broken line.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bag Frames (AREA)
  • External Artificial Organs (AREA)

Claims (12)

  1. Sac à valve se prêtant au vide comprenant un matériau de paroi (4) comprenant au moins une couche intérieure (6) perméable au gaz et imperméable à un produit de remplissage et au moins une couche extérieure (8) ainsi que deux faces de fermeture (10), une première face de fermeture (10) étant formée par la fermeture du sac à valve (2) et une deuxième face de fermeture (10) étant disposée à l'opposé de la première face de fermeture (10) et un espace intermédiaire (14) étant formé entre une partie de la couche intérieure (6) délimitant un espace intérieur du sac (12) et la couche extérieure (8) et sur au moins une face de fermeture (10) du sac à valve (2), formée par le pliage du matériau de paroi (4), au moins un canal de désaréation (18), débouchant de telle façon d'une partie marginale de matériau de paroi (16) que grâce à lui l'espace intermédiaire (14) est formé de manière à pouvoir être purgé vers l'environnement, étant disposé entre la couche intérieure (6) et la couche extérieure (8) d'une zone de matériau de paroi, caractérisé en ce que la couche extérieure du matériau de paroi est formée imperméable au gaz et que la couche intérieure (6) et la couche extérieure (8) sont connectées l'une à l'autre sur la face de fermeture (10) le long d'une bande de bord de matériau de paroi (32) adjacente au bord de matériau de paroi, une ouverture de sortie (34) du canal de désaréation (18) étant formée entre la couche intérieure (6) et la couche extérieure (8) uniquement au niveau de la partie marginale de matériau de paroi (16).
  2. Sac à valve se prêtant au vide selon la revendication 1,
    caractérisé en ce que l'au moins une face de fermeture (10) est formée par le pliage du matériau de paroi (4) à la manière d'un fond croisé.
  3. Sac à valve se prêtant au vide selon la revendication 2,
    caractérisé en ce que le canal de désaréation (18) et formé dans un rabat latéral extérieur (20) formant conjointement une face de fermeture (10).
  4. Sac à valve se prêtant au vide selon la revendication 3,
    caractérisé en ce que le rabat latéral extérieur (20) présente la partie marginale de matériau de paroi (16) adjacente à l'environnement.
  5. Sac à valve se prêtant au vide selon l'une quelconque des revendications précédentes, caractérisé en ce qu'un axe longitudinal central (22) du canal de désaréation (18) s'étend essentiellement parallèle à un bord étroit (24) de l'au moins une face de fermeture (10).
  6. Sac à valve se prêtant au vide selon l'une quelconque des revendications précédentes, caractérisé en ce que la couche intérieure (6) et la couche extérieure (8) sont formées à partir du même matériau.
  7. Sac à valve se prêtant au vide selon la revendication 6, caractérisé en ce que la couche intérieure (6) et la couche extérieure (8) sont formées principalement d'une polyoléfine, en particulier de polyéthylène.
  8. Sac à valve se prêtant au vide selon l'une quelconque des revendications précédentes, caractérisé en ce que la partie de la couche intérieure (6) délimitant l'espace intérieur du sac (12) présente des ouvertures de purge (36).
  9. Sac à valve se prêtant au vide selon l'une quelconque des revendications précédentes, caractérisé en ce que le sac à valve (2) présente des éléments d'espacement qui tendent l'espace intermédiaire (14).
  10. Sac à valve se prêtant au vide selon la revendication 8 et la revendication 9, caractérisé en ce que les éléments d'espacement sont formés par des bords des ouvertures de purge (36) dans la couche intérieure (6).
  11. Sac à valve se prêtant au vide selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une feuille de couverture (38) couvrant la partie marginale de matériau de paroi (16) et formant conjointement le canal de désaréation (18) est disposée sur l'au moins une face de fermeture (10).
  12. Sac à valve se prêtant au vide selon la revendication 11,
    caractérisé en ce qu'un élément de couverture (40) s'étendant de la partie marginale de matériau de paroi (16) jusqu'à un bord de la feuille de couverture (38) est disposé entre l'au moins une face de fermeture (10) et la feuille de couverture (38).
EP18730249.2A 2017-05-23 2018-05-23 Sac à valve se prêtant au vide Active EP3630634B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE202017103128.4U DE202017103128U1 (de) 2017-05-23 2017-05-23 Entlüftbarer Ventilsack
PCT/EP2018/063557 WO2018215560A1 (fr) 2017-05-23 2018-05-23 Sac à valve se prêtant au vide

Publications (3)

Publication Number Publication Date
EP3630634A1 EP3630634A1 (fr) 2020-04-08
EP3630634C0 EP3630634C0 (fr) 2023-08-02
EP3630634B1 true EP3630634B1 (fr) 2023-08-02

Family

ID=62567606

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18730249.2A Active EP3630634B1 (fr) 2017-05-23 2018-05-23 Sac à valve se prêtant au vide

Country Status (9)

Country Link
US (1) US11214407B2 (fr)
EP (1) EP3630634B1 (fr)
CN (1) CN110914166B (fr)
AU (1) AU2018272943B2 (fr)
CA (1) CA3064489A1 (fr)
DE (1) DE202017103128U1 (fr)
ES (1) ES2961947T3 (fr)
UA (1) UA127986C2 (fr)
WO (1) WO2018215560A1 (fr)

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US3117711A (en) * 1960-05-30 1964-01-14 Natro Cellulosa S P A Plastic bag
DE1611667C3 (de) * 1967-08-08 1979-05-31 Fardem-Lissner Gmbh, 4040 Neuss Entlüftbarer Ventilsack
DE1809578A1 (de) * 1968-11-18 1970-07-30 Windmoeller & Hoelscher Sack oder Beutel aus Kunststoffolie mit Be- und/oder Entlueftung durch Perforationen
DE2132668A1 (de) * 1971-07-01 1973-01-18 Lissner Gmbh Entlueftbarer ventilsack
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US20200172297A1 (en) 2020-06-04
ES2961947T3 (es) 2024-03-14
CN110914166B (zh) 2022-05-17
AU2018272943B2 (en) 2023-11-16
CA3064489A1 (fr) 2018-11-29
NZ759032A (en) 2021-09-24
EP3630634A1 (fr) 2020-04-08
AU2018272943A1 (en) 2019-12-05
WO2018215560A1 (fr) 2018-11-29
US11214407B2 (en) 2022-01-04
DE202017103128U1 (de) 2018-08-24
EP3630634C0 (fr) 2023-08-02
UA127986C2 (uk) 2024-03-06
CN110914166A (zh) 2020-03-24

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