EP0912420A1 - Container with pressure compensation holes - Google Patents

Container with pressure compensation holes

Info

Publication number
EP0912420A1
EP0912420A1 EP97931672A EP97931672A EP0912420A1 EP 0912420 A1 EP0912420 A1 EP 0912420A1 EP 97931672 A EP97931672 A EP 97931672A EP 97931672 A EP97931672 A EP 97931672A EP 0912420 A1 EP0912420 A1 EP 0912420A1
Authority
EP
European Patent Office
Prior art keywords
container
inner bag
outer container
weld seam
openings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97931672A
Other languages
German (de)
French (fr)
Other versions
EP0912420B1 (en
Inventor
Roland Kneer
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.)
Gaplast GmbH
Original Assignee
Gaplast GmbH
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 Gaplast GmbH filed Critical Gaplast GmbH
Priority to SI9730621T priority Critical patent/SI0912420T1/en
Publication of EP0912420A1 publication Critical patent/EP0912420A1/en
Application granted granted Critical
Publication of EP0912420B1 publication Critical patent/EP0912420B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • B65D83/00—Containers or packages with special means for dispensing contents
    • B65D83/0055—Containers or packages provided with a flexible bag or a deformable membrane or diaphragm for expelling the contents
    • 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
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
    • B65D1/0207—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features
    • B65D1/0215—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features multilayered
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S215/00—Bottles and jars
    • Y10S215/902—Vent

Definitions

  • the invention relates to a container produced in the coextrusion blow molding process, consisting of an essentially rigid outer container and an easily deformable inner bag, each made of different types of thermoplastic plastics that do not weld together, with a container opening and at least two pressure compensation openings in the wall of the outer container for pressure compensation in the space between the Outer container and the inner bag upon contraction of the inner bag, wherein when excess material is squeezed off at the bottom of the blow mold, the inner bag is closed by a bottom weld seam and this bottom weld seam is clamped in the likewise closed bottom of the outer container.
  • Such a container is described in DE 41 39 555 C2.
  • an outwardly projecting web is formed on the bottom of the outer container, in which material of the outer container is brought together when the blow mold is closed, since the material of the inner bag retracts inward from the squeezing edge due to a jamming effect in the region of the projecting web.
  • material of the outer container passes over part of the height of the above Bridges in contact with each other, creating a closed weld.
  • the bottom weld seam of the inner bag is anchored in the adjacent area of the web.
  • the web can have, for example, an approximately kite-shaped cross-sectional shape, but other, for example curved, cross-sectional shapes of the web can also lead to a welded bottom seam of the outer container.
  • the bottom weld seam of the inner bag can also be attached to the bottom of the outer container in a different manner, for example by means of suitable sliders in the blow mold.
  • the pressure compensation openings on the outer container are formed by squeezing the tubular blank in the shoulder area when the blow mold is closed, the material being squeezed out smoothly without the formation of a protruding web, so that the two material layers of the outer container do not come into contact come together because this is prevented by the double layer between the inner bag.
  • these pressure equalization openings on both sides lie at points which are in alignment with the intersection points of the bottom weld seam with the circumferential seam of the container.
  • these pressure compensation openings lie in the circumferential direction on the intersection lines of a plane passing through the central longitudinal axis of the container and the bottom seam with the peripheral wall of the container. If the point of intersection of the bottom weld seam with the peripheral wall is mentioned above, this also includes the case that the bottom weld seam does not extend over the entire diameter of the container, as a result of which the intersection points are formed in this case by a line extending the bottom weld seam.
  • the volume of the inner bag is reduced and air from the surroundings of the container enters the space between the inner bag and the outer container to equalize the pressure. A certain vacuum always remains in the container, which maintains the contraction of the inner bag.
  • the inner bag is drawn in a horizontal section, i.e. essentially in a star shape in a plane perpendicular to the longitudinal axis of the container when the contents of the container are discharged.
  • the four detached areas increase in size, so that the star shape mentioned above arises approximately.
  • the present invention has for its object to develop a container of the type under consideration so that the negative pressure that occurs in the inner bag after release of filling substance is reduced.
  • At least one pressure compensation opening is formed in the outer container on both sides of the bottom weld seam, all pressure compensation openings being offset with respect to the intersection points of the bottom weld seam (or their extension) with the peripheral wall of the outer container. It is preferred that the pressure compensation openings are arranged offset by approximately 90 ° to the intersection points, although the invention is not limited to this.
  • the pressure equalization openings in the container according to the invention are no longer in the narrower region of the intersection points of the bottom weld seam with the circumferential wall, but rather in an area offset by 90 °, so that the inner bag is at least at the initial contraction no longer replaces in the area of the intersection points.
  • This circumferential area is preferably offset by 45o to 135o to the intersection points.
  • the vacuum can be minimized under otherwise identical boundary conditions by arranging two diametrically opposite pressure compensation openings in a plane which is at right angles to the plane running through the bottom seam and the longitudinal central axis of the container.
  • pressure equalization openings can also be formed at a distance one above the other on each side of the bottom weld seam.
  • These pressure compensation openings can be formed by elongated incisions in the wall of the outer container, for example by cutting them into the wall with a knife, punching tool or with a laser, it then being possible to tear open a remaining inner wall section by applying a compressive force.
  • This can be accomplished, for example, in the case of a container whose outer wall has a wall thickness of approximately 0.7 to 0.9 mm in such a way that a crescent-shaped incision is made with a knife guided on a circular path, which cuts the wall except for one cut through the remaining safety wall thickness of approx. 0.2 mm, which ensures that, despite the tolerances that occur, the inner bag cannot be damaged.
  • a pressure stamp can be pressed so strongly against the outer wall on one side of the cut that the remaining wall section bursts open.
  • a pressure compensation opening can be formed with a punching tool or with a laser.
  • the pressure equalization openings can also be formed by punctiform bores or punctures in the wall of the outer container, it being possible for the injection needle to be provided with a central bore which is connected to a pressure medium source. If the injection needle penetrates the wall of the outer container, the pressure medium, which may be air, water or a gel, for example, is pressed so firmly against the inner bag at the moment of passage from the wall of the outer container that the latter retreats, so that the inner bag cannot be damaged by the needle.
  • the pressure medium which may be air, water or a gel, for example
  • the container according to the invention can obviously be a so-called wide-neck container, since the pressure equalization openings can be formed not only in the shoulder area, but at any point on the outer container.
  • FIG. 1 shows a vertical section through a container of the type under consideration, which is produced in coextrusion blow molding
  • Figure 2 is a perspective view of a known container with open shoulder seams.
  • FIG. 3 shows a horizontal section through the container according to FIG. 2 above the pinched bottom seam of the inner bag in a state in which the inner bag has contracted;
  • Fig. 4 is a perspective view of a container according to the invention in a representation corresponding to Fig. 2 and
  • FIG. 5 shows a horizontal section through the container according to FIG. 4 in a representation corresponding to FIG. 3.
  • the container 1 shown in FIG. 1 contains a container neck 2 and a shoulder section 3.
  • a pump for dispensing the container contents can be attached to the container opening 4, without the invention being restricted to this.
  • the container can also be designed as a squeeze bottle in which the container wall is pressed together by hand to dispense the contents of the container, and the container can also be a so-called wide-neck container without a shoulder section.
  • kite-shaped web 5 is formed, in the lower region of which in the figure the material layers of the outer container 6 (see FIG. 3) touch, since in the mold cavity the Webs have withdrawn the two squeezed material layers of the inner bag 7 a little from the separation point upwards.
  • the weld seam of the inner bag formed during the squeezing process is clamped in the upper region of the web 5 and is thus held in the axial direction.
  • Fig. 2 shows a known container, in which the pressure equalization required for dispensing the container content in the space between the outer container and the inner bag is effected by open shoulder seams 8 of the outer container 6, which are formed by a smooth, seamless squeezing process of the blow mold in this area.
  • the open shoulder seams 8 lie in the vertical plane 9, which runs through the axis of the web 5 and the central longitudinal axis 10 of the container.
  • the points of intersection of this plane 9 with the peripheral wall of the outer container 6 are designated in FIG. 3 by the reference number 11.
  • the inner bag 7 detaches from the inner wall of the outer container at four increasingly larger areas, specifically at the areas 12 surrounding the intersection points 11, at which - seen in the circumferential direction of the container - the air for pressure equalization enters as well as at areas 13 offset from this by about 90 °. This has the consequence that a star-like contraction form of the inner container is formed.
  • the contraction of the inner container 7 from four sides requires a relatively large collapse force, which corresponds to a likewise relatively large negative pressure in the inner bag, with which this form of contraction is maintained.
  • the result is a relatively large permeation, risk of leakage of the inner bag 7 and a relatively large residual amount that can not be discharged from the inner bag.
  • FIG. 4 shows, in a representation corresponding to FIG. 2, a container 1 according to the invention.
  • This container does not contain any open shoulder seams for pressure equalization, but on the plane 9 or the position of the open shoulder seams 8 according to FIG. 2 by an angle ⁇ of 90 ° in each case Staggered locations two pressure equalization openings 14, which are marked purely schematically in Figure 5. Since no pressure equalization openings are provided in the area of the intersection points 11, the inner bag 7 does not detach from the inner wall of the outer container 6 when the contents of the container are released, ie there are no contraction sections 12 of the star-shaped contraction according to FIG. 3. The inner bag 7 only pulls from two sides, this area increasingly spreading around the pressure equalization openings 14 and being identified in FIG. 5 by the reference symbol 15. A so-called "dog bone shape" of inner bag contraction is increasingly emerging.
  • This contraction of the inner bag which occurs only from two sides, has the consequence that it requires only a lower collapsing force, which corresponds to a lower vacuum to maintain the contraction form.
  • the result is less permeation, a reduced risk of leakage and a smaller residual amount that cannot be discharged.
  • the contraction which only takes place from two sides can of course not only be brought about by the fact that the pressure equalization openings are formed exactly offset by 90 ° to the intersection points 11. It is important that there are no pressure equalization openings in the closer circumferential area to the intersection points 11, which can cause the inner bag 7 to detach from the wall of the outer container 6 in this area.
  • the bilateral contraction can of course also be caused by the fact that further pressure equalization openings 14 are formed on both sides of the pressure equalization openings, but these must maintain a sufficient circumferential distance from the intersection points 11.

Abstract

PCT No. PCT/DE97/01348 Sec. 371 Date Dec. 30, 1998 Sec. 102(e) Date Dec. 30, 1998 PCT Filed Jun. 27, 1997 PCT Pub. No. WO98/01366 PCT Pub. Date Jan. 15, 1998The receptacle is produced in a coextrusion-type blow molding process and consists of a stiff outer receptacle and an easily deformable inner bag which are made from respectively different thermoplastic materials that do not form a welded joint with one another. The bottom weld seam of the inner bag is clamped in a closed bottom web of the outer receptacle. The pressure compensating openings are offset by about 90 DEG with respect to the plane passing through the bottom weld seam and the longitudinal center axis of the receptacle, whereby the inner bag is only contracted at two sides when the receptacle contents is discharged. The negative pressure prevailing inside the inner bag is thereby reduced.

Description

Behälter mit Druckausgleichsöffnungen Containers with pressure equalization openings
Die Erfindung betrifft einen im Coextrusionsblasverfahren hergestellten Behälter, bestehend aus einem im wesentlichen steifen Außenbehälter und einem leicht verformbaren Innenbeutel aus jeweils verschiedenartigen, keine Schweißverbindung miteinander eingehenden thermoplastischen Kunststoffen, mit einer Behälteröffnung und wenigstens zwei Druckausgleichsöffnungen in der Wand des Außenbehälters zum Druckausgleich im Zwischenraum zwischen dem Außenbehälter und dem Innenbeutel bei Kontraktion des Innenbeutels, wobei beim Abquetschen von Überschußmaterial am Boden der Blasform der Innenbeutel durch eine Bodenschweißnaht verschlossen und diese Bodenschweißnaht in den ebenfalls verschlossenen Boden des Außenbehälters eingeklemmt ist.The invention relates to a container produced in the coextrusion blow molding process, consisting of an essentially rigid outer container and an easily deformable inner bag, each made of different types of thermoplastic plastics that do not weld together, with a container opening and at least two pressure compensation openings in the wall of the outer container for pressure compensation in the space between the Outer container and the inner bag upon contraction of the inner bag, wherein when excess material is squeezed off at the bottom of the blow mold, the inner bag is closed by a bottom weld seam and this bottom weld seam is clamped in the likewise closed bottom of the outer container.
Ein derartiger Behälter ist in der DE 41 39 555 C2 beschrieben. Bei diesem bekannten Behälter ist am Boden des Außenbehälters ein nach außen vorstehender Steg ausgebildet, in dem beim Schließen der Blasform Material des Außenbehälters zusammengeführt wird, da sich das Material des Innenbeutels infolge einer Stauwirkung im Bereich des vorstehenden Stegs von der Abquetschkante nach innen zurückzieht. Hierdurch gelangt Material des Außenbehälters über ein Teil der Höhe des vorstehenden Stegs miteinander in Berührung, wodurch eine geschlossene Schweißnaht entsteht. Die Bodenschweißnaht des Innenbeutels ist in dem anschließenden Bereich des Stegs verankert. Der Steg kann dabei beispielsweise eine etwa drachenförmige Querschnittsform haben, wobei aber auch andere, beispielsweise gewölbte Querschnittsformen des Steges zu einer verschweißten Bodennaht des Außenbehälters führen können. Zu weiten Einzelheiten der Herstellung des vorbekannten Behälters wird auf die DE 4139 555 C2 verwiesen.Such a container is described in DE 41 39 555 C2. In this known container, an outwardly projecting web is formed on the bottom of the outer container, in which material of the outer container is brought together when the blow mold is closed, since the material of the inner bag retracts inward from the squeezing edge due to a jamming effect in the region of the projecting web. As a result, material of the outer container passes over part of the height of the above Bridges in contact with each other, creating a closed weld. The bottom weld seam of the inner bag is anchored in the adjacent area of the web. The web can have, for example, an approximately kite-shaped cross-sectional shape, but other, for example curved, cross-sectional shapes of the web can also lead to a welded bottom seam of the outer container. For extensive details of the manufacture of the known container, reference is made to DE 4139 555 C2.
Die Bodenschweißnaht des Innenbeutels kann aber auch auf andere Weise am Boden des Außenbehälters befestigt werden, beispielsweise mittels geeigneter Schieber in der Blasform.The bottom weld seam of the inner bag can also be attached to the bottom of the outer container in a different manner, for example by means of suitable sliders in the blow mold.
Bei dem vorbekannten Behälter werden die Druckausgleichsöffnungen am Außenbehälter dadurch ausgebildet, daß der schlauch- förmige Rohling beim Schließen der Blasform im Schulterbereich abgequetscht wird, wobei hier das Material ohne Ausbildung eines vorstehenden Steges glatt abgequetscht wird, so daß die beiden Materialschichten des Außenbehälters nicht in Berührung miteinander gelangen, weil dies durch die dazwischen liegende Doppelschicht des Innenbeutels verhindert wird. Damit entstehen bei dem vorbekannten Behälter im Schulterbereich zwei unverschweißte Nähte bei dem Außenbehälter, die sich vom Schulterbereich bis zum Halsbereich erstrecken.In the known container, the pressure compensation openings on the outer container are formed by squeezing the tubular blank in the shoulder area when the blow mold is closed, the material being squeezed out smoothly without the formation of a protruding web, so that the two material layers of the outer container do not come into contact come together because this is prevented by the double layer between the inner bag. This creates two unwelded seams in the outer container in the previously known container in the shoulder region, which extend from the shoulder region to the neck region.
Diese beidseitigen Druckausgleichsöffnungen liegen in Umfangs- richtung des Behälters betrachtet an Stellen, die mit den Schnittpunkten der Bodenschweißnaht mit der Umfangsnaht des Behälters fluchten. Anders ausgedrückt, liegen diese Druckausgleichsöffnungen in Umfangsrichtung auf den Schnittlinien einer durch die Mittellängsachse des Behälters und die Bodennaht gehenden Ebene mit der Umfangswand des Behälters. Wenn oben von Schnittpunkten der Bodenschweißnaht mit der Um- fangswand gesprochen ist, beinhaltet dies auch den Fall, daß sich die Bodenschweißnaht nicht über den gesamten Durchmesser des Behälters erstreckt, wodurch in diesem Fall die Schnittpunkte durch eine die Bodenschweißnaht verlängernde Linie gebildet sind.Viewed on the circumferential direction of the container, these pressure equalization openings on both sides lie at points which are in alignment with the intersection points of the bottom weld seam with the circumferential seam of the container. In other words, these pressure compensation openings lie in the circumferential direction on the intersection lines of a plane passing through the central longitudinal axis of the container and the bottom seam with the peripheral wall of the container. If the point of intersection of the bottom weld seam with the peripheral wall is mentioned above, this also includes the case that the bottom weld seam does not extend over the entire diameter of the container, as a result of which the intersection points are formed in this case by a line extending the bottom weld seam.
Bei Abgabe des Behälterinhalts beispielsweise mittels einer Pumpe verringert sich das Volumen des Innenbeutels, und es tritt zum Druckausgleich Luft aus der Umgebung des Behälters in den Zwischenraum zwischen Innenbeutel und Außenbehälter ein. Dabei verbleibt in dem Behälter stets ein gewisser Unterdruck, der die Kontraktion des Innenbeutels aufrecht erhält.When the contents of the container are dispensed, for example by means of a pump, the volume of the inner bag is reduced and air from the surroundings of the container enters the space between the inner bag and the outer container to equalize the pressure. A certain vacuum always remains in the container, which maintains the contraction of the inner bag.
Bei dem vorbekannten Behälter zieht sich der Innenbeutel im Horizontalschnitt, d.h. in einer zur Längsachse des Behälters senkrechten Ebene im wesentlichen sternförmig zusammen, wenn der Behälterinhalt ausgebracht wird. Dies bedeutet, daß sich der Innenbeutel an vier im wesentlichen jeweils paarweise gegenüberliegenden Stellen vom Außenbehälter löst, und zwar -in Umfangs- richtung gesehen- an den Druckausgleichsöffnungen und an den hierzu um jeweils 90o versetzten Umfangsbereichen. Mit zunehmender Kontraktion vergrößern sich dabei jeweils die vier abgelösten Bereiche, so daß in etwa die oben angesprochene Sternform entsteht.In the case of the known container, the inner bag is drawn in a horizontal section, i.e. essentially in a star shape in a plane perpendicular to the longitudinal axis of the container when the contents of the container are discharged. This means that the inner bag detaches from the outer container at four points, which are essentially opposite each other in pairs, namely - seen in the circumferential direction - at the pressure compensation openings and at the circumferential areas offset by 90 ° for this purpose. With increasing contraction, the four detached areas increase in size, so that the star shape mentioned above arises approximately.
Diese Kontraktion an vier Seiten des Innenbeutels hat zur Folge, daß ein verhältnismäßig großer Unterdruck in dem Innenbeutel auftritt - und zwar natürlich ungeachtet dessen, daß durch die Druckausgleichsöffnungen Umgebungsluft in den Zwischenraum zwischen Außenbehälter und Innenbeutel eintritt - anders ausgedrückt, ist eine verhältnismäßige große Kollabierkraft erforderlich, um diese sternförmige Kontraktion hervorzurufen und dann aufrecht zu erhalten. Je größer das Vakuum innerhalb des Innenbeutels ist, umso größer ist jedoch auch die Permeation durch die Wand des Innenbeutels und die Gefahr der Undichtigkeit. Durch die Permeation kann die Qualität des Behälterinhalts beeinträchtigt werden, während bei Auftreten von Undichtigkeit durch eintretende Luft in den Beutel die Pumpe funktionsunfähig werden oder der Behälterinhalt auslaufen kann.This contraction on four sides of the inner bag has the consequence that a relatively large negative pressure occurs in the inner bag - and of course regardless of the fact that ambient air enters through the pressure compensation openings into the space between the outer container and the inner bag - in other words, a relatively large collapsing force is required to induce and then maintain this star-shaped contraction. However, the greater the vacuum inside the inner bag, the greater the permeation through the wall of the inner bag and the risk of leakage. Permeation can adversely affect the quality of the contents of the container, whereas if there is a leak due to air entering the bag, the pump may become inoperative or the contents of the container may leak.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, einen Behälter der betrachteten Art so weiter zu entwickeln, daß der Unterdruck verringert ist, der in dem Innenbeutel nach Abgabe von Füllsubstanz auftritt.The present invention has for its object to develop a container of the type under consideration so that the negative pressure that occurs in the inner bag after release of filling substance is reduced.
Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Patentanspruchs 1 gelöst.This object is achieved by the features of claim 1.
Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet.Advantageous developments of the invention are characterized in the subclaims.
Bei dem erfindungsgemäßen Behälter sind - in Umfangsrichtung des Behälters betrachtet - zu beiden Seiten der Bodenschweißnaht jeweils wenigstens eine Druckausgleichsöffnung in dem Außenbehälter ausgebildet, wobei alle Druckausgleichsöffnungen gegenüber den Schnittpunkten der Bodenschweißnaht (oder deren Verlängerung) mit der Umfangswand des Außenbehälters versetzt sind. Bevorzugt ist dabei, daß die Druckausgleichsöffnungen um etwa 90o zu den Schnittpunkten versetzt angeordnet sind, obwohl die Erfindung hierauf nicht beschränkt ist.In the container according to the invention - viewed in the circumferential direction of the container - at least one pressure compensation opening is formed in the outer container on both sides of the bottom weld seam, all pressure compensation openings being offset with respect to the intersection points of the bottom weld seam (or their extension) with the peripheral wall of the outer container. It is preferred that the pressure compensation openings are arranged offset by approximately 90 ° to the intersection points, although the invention is not limited to this.
Hierdurch wird erreicht, daß sich der Innenbeutel nicht mehr an vier etwa um 90o zueinander versetzten Bereichen von dem Außenbehälter ablöst, sondern es bildet sich eine sogenannte "Hunde- knochenform" bei der Kontraktion des Innenbeutels aus, bei der sich der Innenbeutel nur an zwei gegenüberliegenden Bereichen von der Wand des Außenbehälters abhebt, deren Zentrum etwa um 90o versetzt zu den oben genannten Schnittpunkten liegt. D.h., der Innenbeutel wird beidseitig zunehmend flacher zusammengedrückt, wobei die Mittelachse der zusammengedrückten Querschnittsform in etwa mit der eingeklemmten Bodennaht des Innenbeutels zusammenfällt.This ensures that the inner bag no longer detaches from the outer container at four areas which are offset by approximately 90 ° from one another, but a so-called "dogbone shape" is formed during the contraction of the inner bag, in which the inner bag only contacts two opposite ones Areas from the wall of the outer container, the center of which around 90o offset from the above-mentioned intersection points. That is, the inner bag is compressed increasingly flat on both sides, the central axis of the compressed cross-sectional shape roughly coinciding with the clamped bottom seam of the inner bag.
Diese nicht mehr von vier, sondern von zwei Seiten aus erfolgende Kontraktion des Innenbeutels hat zur Folge, daß der Unterdruck in dem Innenbeutel gegenüber der Ablösung an mehr als zwei Bereichen erheblich verringert wird. Verringert sind sowohl die Kollabierkraft, die den Beutel in die "Hundeknochenform" zusammenzieht, als auch der Unterdruck, der diese Form aufrecht erhält.This contraction of the inner bag, which no longer takes place from four, but from two sides, has the consequence that the negative pressure in the inner bag is considerably reduced compared to the detachment in more than two areas. Both the collapsing force that pulls the bag into the "dogbone shape" and the negative pressure that maintains this shape are reduced.
Infolgedessen wird die Permeation in den Innenbeutel verringert, die Gefahr von Undichtigkeit sinkt und die Restmenge in dem Innenbeutel wird verringert, die nicht austragbar ist.As a result, the permeation into the inner bag is reduced, the risk of leakage is reduced and the residual amount in the inner bag is reduced, which cannot be discharged.
Es versteht sich, daß die nur von zwei Seiten aus erfolgende Kontraktion des Innenbeutels nicht nur dadurch hervorgerufen werden kann, daß exakt um 90o zu den genannten Schnittpunkten versetzte Druckausgleichsöffnungen ausgebildet werden. Diese können sich vielmehr in einem vom jeweiligen Einzelfall beispielsweise vom Material des Innenbeutels und dessen Wandstärke abhängigen Umfangsbereich befinden, der gegenüber den Schnittpunkten versetzt ist, beispielsweise durch jeweils zwei in Umf angs r i chtung voneinander beabstandete Druckausgleichsöffnungen, die paarweise um jeweils ca. 80o zu den Schnittpunkten versetzt sein können.It goes without saying that the contraction of the inner bag, which occurs only from two sides, cannot be caused only by the fact that pressure equalization openings offset exactly by 90 ° to the mentioned intersection points are formed. Rather, they can be located in a circumferential area that depends on the individual case, for example on the material of the inner bag and its wall thickness, which is offset with respect to the intersection points, for example by two pressure equalization openings spaced apart from one another in circumferential direction, which in pairs by about 80o each Intersections can be offset.
Wesentlich ist, daß sich die Druckausgleichsöffnungen bei dem erfindungsgemäßen Behälter in Umfangsrichtung gesehen nicht mehr in dem engeren Bereich der Schnittpunkte der Bodenschweißnaht mit der Umfangswand befinden, sondern möglichst in einem um 90o versetzten Bereich, so daß sich der Innenbeutel zumindest bei der anfänglichen Kontraktion nicht mehr im Bereich der Schnittpunkte ablöst. Dieser Umfangsbereich ist bevorzugt um 45o bis 135o zu den Schnittpunkten versetzt.It is essential that the pressure equalization openings in the container according to the invention, viewed in the circumferential direction, are no longer in the narrower region of the intersection points of the bottom weld seam with the circumferential wall, but rather in an area offset by 90 °, so that the inner bag is at least at the initial contraction no longer replaces in the area of the intersection points. This circumferential area is preferably offset by 45o to 135o to the intersection points.
Wie gesagt, läßt sich der Unterdruck bei ansonsten gleichen Randbedingungen dadurch minimieren, daß zwei diametral gegenüberliegende Druckausgleichsöffnungen in einer Ebene angeordnet sind, die im rechten Winkel zu der durch die Bodennaht und die Längsmittelachse des Behälters verlaufenden Ebene liegt.As said, the vacuum can be minimized under otherwise identical boundary conditions by arranging two diametrically opposite pressure compensation openings in a plane which is at right angles to the plane running through the bottom seam and the longitudinal central axis of the container.
Dabei können selbstverständlich auch mehrere Druckausgleichsöffnungen im Abstand übereinanderliegend auf jeder Seite der Bodenschweißnaht ausgebildet sein.Of course, several pressure equalization openings can also be formed at a distance one above the other on each side of the bottom weld seam.
Diese Druckausgleichsöffnungen können durch längliche Einschnitte in die Wand des Außenbehälters gebildet sein, indem diese beispielsweise durch ein Messer, Stanzwerkzeug oder mit einem Laser in die Wand eingeschnitten sind, wobei ein verbleibender innerer Wandabschnitt anschließend durch Aufbringen einer Druckkraft aufgerissen werden kann. Dies kann beispielsweise bei einem Behälter, dessen Außenwand eine Wandstärke von ca. 0,7 bis 0,9 mm hat, in der Weise bewerkstelligt werden, daß mit einem auf einer Kreisbahn geführten Messer ein sichelförmiger Einschnitt erzeugt wird, der die Wand bis auf eine restliche Sicherheits-Wandstärke von ca. 0,2 mm durchtrennt, die gewährleistet, daß trotz der auftretenden Toleranzen der Innenbeutel nicht beschädigt werden kann. Anschließend kann beispielsweise ein Druckstempel so kräftig gegen die Außenwand an einer Seite des Schnitts gepreßt werden, daß der restliche Wandabschnitt aufplatzt. Auf ähnliche Weise kann eine Druckausgleichsöffnung mit einem Stanzwerkzeug oder mit einem Laser ausgebildet werden. Die Druckausgleichsöffnungen können auch durch punktförmige Bohrungen oder Einstiche in die Wand des Außenbehälters gebildet sein, wobei die Einstechnadel mit einer zentralen Bohrung versehen sein kann, die mit einer Druckmediumquelle in Verbindung steht. Wenn die Einstechnadel die Wand des Außenbehälters durchdringt, wird im Augenblick des Durchtritts aus der Wand des Außenbehälters das Druckmedium, bei dem es sich beispielsweise um Luft, Wasser oder um ein Gel handeln kann, so fest gegen den Innenbeutel gedrückt, daß dieser zurückweicht, so daß der Innenbeutel durch die Einstechnadel nicht beschädigt werden kann.These pressure compensation openings can be formed by elongated incisions in the wall of the outer container, for example by cutting them into the wall with a knife, punching tool or with a laser, it then being possible to tear open a remaining inner wall section by applying a compressive force. This can be accomplished, for example, in the case of a container whose outer wall has a wall thickness of approximately 0.7 to 0.9 mm in such a way that a crescent-shaped incision is made with a knife guided on a circular path, which cuts the wall except for one cut through the remaining safety wall thickness of approx. 0.2 mm, which ensures that, despite the tolerances that occur, the inner bag cannot be damaged. Then, for example, a pressure stamp can be pressed so strongly against the outer wall on one side of the cut that the remaining wall section bursts open. In a similar manner, a pressure compensation opening can be formed with a punching tool or with a laser. The pressure equalization openings can also be formed by punctiform bores or punctures in the wall of the outer container, it being possible for the injection needle to be provided with a central bore which is connected to a pressure medium source. If the injection needle penetrates the wall of the outer container, the pressure medium, which may be air, water or a gel, for example, is pressed so firmly against the inner bag at the moment of passage from the wall of the outer container that the latter retreats, so that the inner bag cannot be damaged by the needle.
Zum Druckausgleich reichen sehr kleine, kapillarartige Öffnungen, die auf die vorstehend beschriebene Weise an den gewünschten Stellen des Außenbehälters ausgebildet sein können.Very small, capillary-like openings, which can be formed in the manner described above at the desired locations on the outer container, are sufficient for pressure equalization.
Der erfindungsgemäße Behälter kann dabei ersichtlich ein sogenannter Weithalsbehälter sein, da die Druckausgleichsöffnungen nicht nur im Schulterbereich, sondern an jeder beliebigen Stelle des Außenbehälters ausgebildet werden können.The container according to the invention can obviously be a so-called wide-neck container, since the pressure equalization openings can be formed not only in the shoulder area, but at any point on the outer container.
Die Erfindung wird nachfolgend anhand der Zeichnung näher beschrieben. Dabei zeigen:The invention is described below with reference to the drawing. Show:
Fig. 1 einen Vertikalschnitt durch einen im Coextrusions- blasen hergestellten Behälter der betrachteten Art;1 shows a vertical section through a container of the type under consideration, which is produced in coextrusion blow molding;
Fig. 2 eine perspektivische Ansicht eines bekannten Behälters mit offenen Schulternähten;Figure 2 is a perspective view of a known container with open shoulder seams.
Fig. 3 einen Horizontalschnitt durch den Behälter gemäß Fig. 2 oberhalb der eingeklemmten Bodennaht des Innenbeutels in einem Zustand, in dem sich der Innenbeutel zusammengezogen hat ; Fig. 4 eine perspektivische Ansicht eines erfindungsgemäßen Behälters in einer Fig. 2 entsprechenden Darstellung und3 shows a horizontal section through the container according to FIG. 2 above the pinched bottom seam of the inner bag in a state in which the inner bag has contracted; Fig. 4 is a perspective view of a container according to the invention in a representation corresponding to Fig. 2 and
Fig. 5 einen Horizontalschnitt durch den Behälter gemäß Fig. 4 in einer der Fig. 3 entsprechenden Darstellung.5 shows a horizontal section through the container according to FIG. 4 in a representation corresponding to FIG. 3.
Der in Fig. 1 dargestellte Behälter 1 enthält einen Behälterhals 2 und einen Schulterabschnitt 3. An der Behälteröffnung 4 kann eine Pumpe zum Ausbringen des Behälterinhalts befestigt sein, ohne daß die Erfindung hierauf beschränkt ist. Der Behälter kann auch als Quetschflasche ausgestaltet sein, bei der die Behälterwand von Hand zur Abgabe des Behälterinhalts zusammengedrückt wird, und der Behälter kann auch ein sogenannter Weithalsbehälter ohne Schulterabschnitt sein.The container 1 shown in FIG. 1 contains a container neck 2 and a shoulder section 3. A pump for dispensing the container contents can be attached to the container opening 4, without the invention being restricted to this. The container can also be designed as a squeeze bottle in which the container wall is pressed together by hand to dispense the contents of the container, and the container can also be a so-called wide-neck container without a shoulder section.
Am Boden des Behälters ist -bevorzugt infolge des Schließens der Blasform- ein vorstehender, querschnittlich etwa drachenförmiger Steg 5 ausgebildet, in dessen in der Figur unterem Bereich sich die Materialschichten des Außenbehälters 6 (siehe Fig. 3) berühren, da sich in dem Formhohlraum des Steges die beiden abgequetschten Materialschichten des Innenbeutels 7 ein wenig von der Trennstelle nach oben zurückgezogen haben. Die beim Abquetschvorgang gebildete Schweißnaht des Innenbeutels ist in dem oberen Bereich des Stegs 5 eingeklemmt und damit in axialer Richtung gehalten.At the bottom of the container - preferably as a result of the closing of the blow mold - a projecting, cross-sectionally approximately kite-shaped web 5 is formed, in the lower region of which in the figure the material layers of the outer container 6 (see FIG. 3) touch, since in the mold cavity the Webs have withdrawn the two squeezed material layers of the inner bag 7 a little from the separation point upwards. The weld seam of the inner bag formed during the squeezing process is clamped in the upper region of the web 5 and is thus held in the axial direction.
Fig. 2 zeigt einen bekannten Behälter, bei dem der zur Abgabe des Behälterinhalts erforderliche Druckausgleich in dem Zwischenraum zwischen den Außenbehälter und dem Innenbeutel durch offene Schulternähte 8 des Außenbehälters 6 erfolgt, die durch einen glatten, steglosen Abquetschvorgang der Blasform in diesem Bereich ausgebildet sind. Die offenen Schulternähte 8 liegen dabei in der vertikalen Ebene 9, die durch die Achse des Stegs 5 und die Mittellängsachse 10 des Behälters verläuft. Die Schnittpunkte dieser Ebene 9 mit der Umfangswand des Außenbehälters 6 sind in der Fig. 3 mit dem Bezugszeichen 11 bezeichnet.Fig. 2 shows a known container, in which the pressure equalization required for dispensing the container content in the space between the outer container and the inner bag is effected by open shoulder seams 8 of the outer container 6, which are formed by a smooth, seamless squeezing process of the blow mold in this area. The open shoulder seams 8 lie in the vertical plane 9, which runs through the axis of the web 5 and the central longitudinal axis 10 of the container. The points of intersection of this plane 9 with the peripheral wall of the outer container 6 are designated in FIG. 3 by the reference number 11.
Im Verlaufe der Abgabe des Behälterinhalts löst sich der Innenbeutel 7 an vier zunehmend größer werdenden Bereichen von der Innenwand des Außenbehälters ab, und zwar an den die Schnittpunkte 11 umgebenden Bereichen 12, an denen -in Umfangsrichtung des Behälters gesehen die Luft zum Druckausgleich eintritt- sowie an hierzu um etwa 90o versetzten Bereichen 13. Dies hat zur Folge, daß sich eine sternartige Kontraktionsform des Innenbehälters ausgebildet.In the course of the dispensing of the container contents, the inner bag 7 detaches from the inner wall of the outer container at four increasingly larger areas, specifically at the areas 12 surrounding the intersection points 11, at which - seen in the circumferential direction of the container - the air for pressure equalization enters as well as at areas 13 offset from this by about 90 °. This has the consequence that a star-like contraction form of the inner container is formed.
Das Zusammenziehen des Innenbehälters 7 von vier Seiten aus erfordert eine verhältnismäßig große Kollabierkraft, der ein ebenfalls verhältnismäßig großer Unterdruck in dem Innenbeutel entspricht, mit dem diese Kontraktionsform aufrecht erhalten wird. Die Folge sind eine verhältnismäßig große Permeation, Gefahr der Undichtigkeit des Innenbeutels 7 sowie eine verhältnismäßig große Restmenge, die nicht aus dem Innenbeutel austragbar ist.The contraction of the inner container 7 from four sides requires a relatively large collapse force, which corresponds to a likewise relatively large negative pressure in the inner bag, with which this form of contraction is maintained. The result is a relatively large permeation, risk of leakage of the inner bag 7 and a relatively large residual amount that can not be discharged from the inner bag.
Fig. 4 zeigt in einer der Fig. 2 entsprechenden Darstellung einen erfindungsgemäßen Behälter 1. Dieser Behälter enthält keine offenen Schulternähte zum Druckausgleich, sondern an zur Ebene 9 bzw. zur Lage der offenen Schulternähte 8 gemäß Fig. 2 um einen Winkel α von jeweils 90o versetzt liegenden Stellen zwei Druckausgleichsöffnungen 14, die in Figur 5 rein schematisch markiert sind. Da im Bereich der Schnittpunkte 11 keine Druckausgleichsöffnungen vorgesehen sind, löst sich bei Abgabe des Behälterinhalts der Innenbeutel 7 hier nicht von der Innenwand des Außenbehälters 6 ab, d.h. es entstehen keine Kontraktionsabschnitte 12 der sternförmigen Kontraktion gemäß Fig. 3. Der Innenbeutel 7 zieht sich nur von zwei Seiten zusammen, wobei dieser Bereich sich zunehmend um die Druckausgleichsöffnungen 14 herum ausbreitet und in Figur 5 mit dem Bezugszeichen 15 gekennzeichnet ist. Dabei bildet sich zunehmend eine sogenannte "Hundeknochenform" der Innenbeutelkontraktion heraus.FIG. 4 shows, in a representation corresponding to FIG. 2, a container 1 according to the invention. This container does not contain any open shoulder seams for pressure equalization, but on the plane 9 or the position of the open shoulder seams 8 according to FIG. 2 by an angle α of 90 ° in each case Staggered locations two pressure equalization openings 14, which are marked purely schematically in Figure 5. Since no pressure equalization openings are provided in the area of the intersection points 11, the inner bag 7 does not detach from the inner wall of the outer container 6 when the contents of the container are released, ie there are no contraction sections 12 of the star-shaped contraction according to FIG. 3. The inner bag 7 only pulls from two sides, this area increasingly spreading around the pressure equalization openings 14 and being identified in FIG. 5 by the reference symbol 15. A so-called "dog bone shape" of inner bag contraction is increasingly emerging.
Diese nur von zwei Seiten erfolgende Kontraktion des Innenbeutels hat zur Folge, daß sie nur eine geringere Kollabierkraft erfordert, der ein ebenfalls geringerer Unterdruck zur Aufrechterhaltung der Kontraktionsform entspricht. Die Folge sind geringere Permeation, eine ebenfalls verringerte Gefahr der Undichtigkeit und eine kleinere Restmenge, die nicht austragbar ist.This contraction of the inner bag, which occurs only from two sides, has the consequence that it requires only a lower collapsing force, which corresponds to a lower vacuum to maintain the contraction form. The result is less permeation, a reduced risk of leakage and a smaller residual amount that cannot be discharged.
Es wird betont, daß die nur von zwei Seiten erfolgende Kontraktion natürlich nicht nur dadurch hervorgerufen werden kann, daß die Druckausgleichsöffnungen exakt um 90o zu den Schnittpunkten 11 versetzt ausgebildet sind. Wichtig ist, daß sich in dem näheren Umfangsbereich zu den Schnittpunkten 11 keine Druckausgleichsöffnungen befinden, die ein Ablösen des Innenbeutels 7 von der Wand des Außenbehälters 6 in diesem Bereich verursachen können. Die zweiseitige Kontraktion läßt sich natürlich auch dadurch hervorrufen, daß zu beiden Seiten der Druckausgleichsöffnungen 14 weitere Druckausgleichsöffnungen ausgebildet sind, die aber einen genügenden Umfangsabstand von den Schnittpunkten 11 einhalten müssen. It is emphasized that the contraction which only takes place from two sides can of course not only be brought about by the fact that the pressure equalization openings are formed exactly offset by 90 ° to the intersection points 11. It is important that there are no pressure equalization openings in the closer circumferential area to the intersection points 11, which can cause the inner bag 7 to detach from the wall of the outer container 6 in this area. The bilateral contraction can of course also be caused by the fact that further pressure equalization openings 14 are formed on both sides of the pressure equalization openings, but these must maintain a sufficient circumferential distance from the intersection points 11.

Claims

Patentansprüche claims
1. Im Coextrusionsblasverfahren hergestellter Behälter, bestehend aus einem im wesentlichen steifen Außenbehälter und einem leicht verformbaren Innenbeutel aus jeweils verschiedenartigen, keine Schweißverbindung miteinander eingehenden, thermoplastischen Kunststoffen mit einer Behälteröffnung mit wenigstens zwei Druckausgleichsöffnungen in der Wand des Außenbehälters zum Druckausgleich im Zwischenraum zwischen dem Außenbehälter und dem Innenbeutel bei Kontraktion des Innenbeutels, wobei beim Abquetschen von Überschußmaterial am Boden der Blasform der Innenbeutel durch eine Bodenschweißnaht verschlossen und diese Bodenschweißnaht in eine ebenfalls verschlossene Bodenschweißnaht des Außenbehälters eingeklemmt ist, d a d u r c h g e k e n n z e i c h n e t, daß alle Druckausgleichsöffnungen (14) an Stellen des Außenbehälters (6) ausgebildet sind, die gegenüber den Schnittpunkten (11) der Bodenschweißnaht (5) mit der Umfangswand des Außenbehälters (6) in Umfangsrichtung versetzt sind.1. Manufactured in the coextrusion blow molding container, consisting of an essentially rigid outer container and an easily deformable inner bag, each made of different types, no welding connection, thermoplastic plastics with a container opening with at least two pressure equalization openings in the wall of the outer container for pressure equalization in the space between the outer container and the inner bag upon contraction of the inner bag, wherein when excess material is squeezed off at the bottom of the blow mold, the inner bag is closed by a bottom weld seam and this bottom weld seam is clamped into a likewise closed bottom weld seam of the outer container, characterized in that all pressure equalization openings (14) are in places of the outer container (6) are formed, which are opposite the intersection points (11) of the bottom weld (5) with the peripheral wall of the outer container (6) in circumferential direction are offset.
2. Behälter nach Anspruch 1, dadurch gekennzeichnet, daß zu beiden Seiten der Bodenschweißnaht (5) wenigstens eine Druckausgleichsöffnung (14) ausgebildet ist.2. Container according to claim 1, characterized in that at least one pressure compensation opening (14) is formed on both sides of the bottom weld seam (5).
3. Behälter nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß wenigstens jeweils eine Druckausgleichsöffnung (14) um etwa 90o versetzt zu den Schnittpunkten (11) ausgebildet ist.3. Container according to claim 1 or 2, characterized in that at least one pressure equalization opening (14) is formed offset by approximately 90 ° to the intersection points (11).
4. Behälter nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß jeweils wenigstens zwei Druckausgleichsöffnungen im Abstand übereinanderliegend um etwa 90o versetzt zu den Schnittpunkten (11) ausgebildet sind. 4. Container according to one of claims 1 to 3, characterized in that in each case at least two pressure equalization openings are formed one above the other at a distance offset by about 90o to the intersection points (11).
5. Behälter nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Druckausgleichsöffnungen (14) durch längliche Einschnitte in die Wand des Außenbehälters (6) ausgebildet sind.5. Container according to one of claims 1 to 4, characterized in that the pressure compensation openings (14) are formed by elongated incisions in the wall of the outer container (6).
6. Behälter nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Druckausgleichsöffnungen (14) durch punktförmige Bohrungen oder Einstiche in die Wand des Außenbehälters (6) ausgebildet sind. 6. Container according to one of claims 1 to 4, characterized in that the pressure compensation openings (14) are formed by punctiform holes or punctures in the wall of the outer container (6).
EP97931672A 1996-07-04 1997-06-27 Container with pressure compensation holes Expired - Lifetime EP0912420B1 (en)

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PCT/DE1997/001348 WO1998001366A1 (en) 1996-07-04 1997-06-27 Container with pressure compensation holes

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JP2000513683A (en) 2000-10-17
EP0912420B1 (en) 2003-12-17
DE19626968A1 (en) 1998-01-15
ES2213218T3 (en) 2004-08-16
DE29780382U1 (en) 1998-10-08
JP3935213B2 (en) 2007-06-20
US6109468A (en) 2000-08-29
DE59711141D1 (en) 2004-01-29
DK0912420T3 (en) 2004-04-05

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