EP0668222A2 - Récipient flexible en matière synthétique thermoplastique pour produits pouvant s'écouler - Google Patents

Récipient flexible en matière synthétique thermoplastique pour produits pouvant s'écouler Download PDF

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Publication number
EP0668222A2
EP0668222A2 EP95101665A EP95101665A EP0668222A2 EP 0668222 A2 EP0668222 A2 EP 0668222A2 EP 95101665 A EP95101665 A EP 95101665A EP 95101665 A EP95101665 A EP 95101665A EP 0668222 A2 EP0668222 A2 EP 0668222A2
Authority
EP
European Patent Office
Prior art keywords
fold
inner container
test sample
test
folded
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
EP95101665A
Other languages
German (de)
English (en)
Other versions
EP0668222A3 (fr
EP0668222B1 (fr
Inventor
Reiner Baden
Benno Richter
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.)
Kautex Textron GmbH and Co KG
Original Assignee
Kautex Werk Reinold Hagen
KAUTEX WERKE 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 Kautex Werk Reinold Hagen, KAUTEX WERKE GmbH filed Critical Kautex Werk Reinold Hagen
Publication of EP0668222A2 publication Critical patent/EP0668222A2/fr
Publication of EP0668222A3 publication Critical patent/EP0668222A3/fr
Application granted granted Critical
Publication of EP0668222B1 publication Critical patent/EP0668222B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B65D88/00—Large containers
    • B65D88/16—Large containers flexible
    • B65D88/1612—Flexible intermediate bulk containers [FIBC]

Definitions

  • the invention relates to a flexible container made of thermoplastic material according to the preamble of claim 1.
  • a first crease present in a wall region of the container in turn undergoes a fold overlying it, the fold axis of which runs essentially perpendicular to the fold axis of the first crease.
  • Moving these folding axes against each other results in considerable stresses on the container wall, which can lead to the damage mentioned up to the formation of cracks in the container wall.
  • the fact that containers with a volume of the size under consideration here even if these containers are flexible and foldable, must have a minimum wall thickness which normally increases with the volume.
  • the problems described at the outset which are caused by the buckling stress on the wall, will also increase with increasing wall thickness.
  • the invention has for its object to provide a foldable flexible inner container made of thermoplastic material with a larger volume and a corresponding wall thickness, which even with frequent folding and unfolding, as is inevitable with reusable containers, no significant impairment of the nature of its wall experiences. It should be possible to specify a criterion by means of which a suitable plastic can be selected which allows a minimum number of folding processes to be carried out on the container wall and thus a minimum number of transport processes to be carried out without any loss of strength, tightness and the like fear that could jeopardize the usability of the container.
  • the test procedure required to determine whether a material meets the stated requirements should be so simple that the test conditions can be reproduced at any time.
  • the fold that goes back to the first fold is subjected to a kind of flexing stress in such a way that the fold and thus its apex region are displaced by a movement similar to a rolling process, this rolling process also being essentially parallel to that in both directions Folding axis of the fold runs, which was produced by the second folding process.
  • the number of to-and-fro movements to which the test sample can be subjected without being damaged in the area of the flexing process, which would impair the functionality of the inner container is a measure of the durability and thus the usability of the material in question for the production of such flexible inner containers.
  • the point of intersection or, perhaps better, the cutting region of the two folds in the aforementioned rolling process represents the region of the largest Stress, since the back and forth movement of the first fold parallel to itself, which is caused by the rolling process, inevitably also results in a corresponding displacement of the cutting area of both fold lines.
  • the nature of this stress is similar to that which the wall of the empty flexible container experiences when folding when two folding lines intersect each other.
  • the material is subjected to peak stresses in the cutting area, which in the case of the common plastic materials which are suitable for use lead to the weak points mentioned until the wall tears.
  • Whether and at what angle such folding lines or axes intersect on the container depends on the type of folding and / or on the external shape of the container. In any case, the application of the invention does not require that the folds intersect at a right angle.
  • the required strength of the wall of the inner container also depends on the number of revolutions that can be expected with a particular type of container, i.e. that is, the number of folds and folds that the inner container is normally subjected to during its service life.
  • a particular advantage of the invention is that the test can be adapted to the respective conditions in such a way that the number of strokes during the test process is selected accordingly, depending on the required strength.
  • a polypropylene modified in the reactor with an elastomeric plastic has proven to be particularly suitable for producing such inner containers.
  • the initial form of the test sample shown in FIG. 1 of the drawing which can be cut out of the wall of a hollow body, also results from the necessity to fasten the test sample in a suitable manner in order to carry out the test and to perform certain movements on it.
  • the exemplary embodiment of a test sample 10 shown in the drawing has a first strip-shaped section 12, at one end of which a second, essentially rectangular section 14 is connected.
  • the width of the first section 12 increases continuously in such a way that its end facing the second section has the smallest width. Since it is only the area 16 adjoining this end that experiences the stresses required to carry out the test, the shape and dimensions of the other areas of the test sample are of little importance. For the area 16, the only requirement is that it must be possible to fold it twice, and essentially all that is required of the other areas of the test sample, apart from the possibility of fastening the sample in the device, is that it should be the Enable or not hinder folding and the movements required for the test.
  • FIG. 1 Starting from the essentially flat course of the test sample according to FIG. 1, it is first folded around the line 18 by essentially 180, as indicated by the arrow 20.
  • Fig. 2 shows the arrangement of the sample 10 after completion of this first folding process.
  • the first, folded-back section 12 covers part of the second section 14.
  • the line 18 corresponds to the folding axis, the end region 16 of the first section 12 now being part of a double-layer region 17 and the position of the folding line 18 being selected such that the double-layer region 17 with the apex region of the first fold protrudes with respect to the associated boundary edge 24 of the section 14.
  • a second folding of the test sample then takes place approximately along the longitudinal axis 26 of the same, which represents the axis of symmetry of the first section 12, as is indicated by the arrow 28 in FIG. 2. 3, in which the fold axis 18 of the fold created by the first fold has in turn undergone a fold of almost 180 ° and the fold axis 29 of the second fold approximately corresponds to the longitudinal axis 26.
  • test sample double-folded is clamped in the test device 30 shown in FIGS. 4 to 7.
  • This test device has a pneumatic cylinder 32.
  • the piston rod 34 of the piston guided therein is connected to a slide 36 which is slidably guided on the frame 38 of the device.
  • the stroke carried out by the piston and thus by the slide 36 has a length of 30 mm in the embodiment shown in the drawing.
  • FIG. 7 shows that a releasable clamping plate 40 is arranged on the carriage 36, which makes it possible to clamp the folded-back, double-layered region by the second folding at the free end of the first section 12 on the carriage 36 by means of a screw 42.
  • the device 30 is further provided with a stationary table 44, which is arranged on the side of the carriage 30 facing away from the cylinder 32, approximately at the level of the latter.
  • This table 44 has a clamping plate 46 which is attached to the side and serves to clamp the test sample 10 to the table 44 in the area of the second section 14, but outside the area of the twice folded first section 12.
  • a clamping screw 48 is also provided for this.
  • a bar 52 provided with a recess 50 is releasably attached to the table 44 by means of screws 54. The arrangement is such that the recess 50 of the strip 52 is located in the area in which, when the test sample is clamped in the operating position, that four-layer area 22 thereof which lies opposite the boundary edge 24 of the second section 12 of the test sample comes to rest.
  • the bridge-like strip 52 has the function of a hold-down device for this four-layer region 22. Accordingly, the height of the recess 50 is therefore its Extent dimensioned perpendicular to the plane of the table 44 so that it enables a uniform kinking of the test sample and leads to a uniform kink and thus to uniform kink angles, which are essentially maintained during the flexing process. In the specific case, that is to say with a wall thickness of the test sample in the critical areas of 1.2 mm, the recess 50 has a height of approximately 10 mm. On the other hand, it is avoided that the test sample additional mechanical stresses such. B. by clamping or friction, which can falsify the test result. The width of the recess 50 should also be selected so that additional mechanical stresses on the test sample are avoided as far as possible in order to achieve uniform test conditions.
  • FIG. 9 of the drawing shows the position which the test sample, in particular its four-layer region 22 of the first section 12 immediately adjacent to the second section 14, occupies, which is delimited by the apex area which corresponds to the fold axis 18 of the first fold.
  • the bar 52 holds this area in the folded form due to the aforementioned height of the recess 50 such that the four layers are pressed against each other in the area of the bar 52 or the recess 50 thereof, so that the individual layers at least over parts of their flat area Extent lie against each other.
  • a stroke movement in the direction of arrow 56 starting from the position according to FIG. 9 has the consequence that, since the first section 12 of the test sample 10 is advanced by the carriage 36, on the other hand the second section 14 of the test sample 10 cannot follow this movement , the first section 12 is displaced relative to the second section 14 within the fold formed by the latter in the direction of the bar 52. 7 shows that the clamping plate 46 only detects the second section 14 and does not hinder the above-described movement of the first section 12. The latter is moved from the position shown in FIG. 9 to that shown in FIG. 8 during the movement in the direction of the arrow 56, the folding axis 18 of the fold created by the first folding by the length of the stroke 58 in the direction of the arrow in the course of this movement 56 is moved.
  • the apex area of this fold executes a kind of rolling movement that is similar to a flexing process. Since the first fold with fold line 18 is in turn folded by approximately 180 ° to form the fold belonging to the fold axis 29, the material forming the test sample 10 is subjected to a very high load during the aforementioned rolling movement over the length of the stroke 58 in the region of intersection of the two folds. This highly stressed region runs along the fold axis 29 of the second fold over the length of the parallel stroke movement in the direction of the arrow 56, the apex region of the fold axis 18 being rolled off along the fold axis 29.
  • the type of this stress corresponds approximately to the type of stress that the material experiences in the areas of the inner container in which two fold or crease lines intersect.
  • the strip 52 which acts as a hold-down device, prevents the folded areas from opening, ie unfolding, due to the elasticity of the material and / or the forces acting on it. In this way, precisely defined and reproducible conditions for carrying out such tests can be established.
  • the test specimen shown in FIG. 1 of the drawing has an overall length of approximately 220 mm, of which approximately 150 mm is accounted for by the first section 12 on which the test is carried out.
  • the first section 12 has a width of 20 mm.
  • the first section widens continuously and symmetrically to a width of 70 mm towards its free end. This broadening serves in particular for better handling, in particular when carrying out the second folding about the longitudinal and symmetry plane of the first section.
  • the area of the first section 12 on which the test is carried out ie the area along which the apex area of the first fold is moved back and forth, has a width of approximately between 25 mm and 35 mm.
  • test sample by removing a corresponding section from the wall of an inner container, but by other means, for example by pressing the plastic to be tested, albeit using a cutout from the wall of an extrusion blow molding process manufactured inner container will be given preference because of the better comparability.
  • test method it is not so important to reproduce exactly the conditions and stresses that have to be observed or occur in practice.
  • test method described above will result in a much greater stress on the material than it occurs in practice.
  • this is not a disadvantage, since it is easily possible to establish a relationship, for example, between the number of strokes that the material is subjected to during the test procedure without noticeably impairing its properties, and the durability under the stresses to be expected in practice.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
  • Tubes (AREA)
  • Closures For Containers (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
  • Packages (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
EP95101665A 1994-02-19 1995-02-08 Récipient flexible en matière synthétique thermoplastique pour produits pouvant s'écouler Expired - Lifetime EP0668222B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4405301 1994-02-19
DE4405301A DE4405301A1 (de) 1994-02-19 1994-02-19 Flexibler Behälter aus thermoplastischem Kunststoff für fließfähige Füllgüter

Publications (3)

Publication Number Publication Date
EP0668222A2 true EP0668222A2 (fr) 1995-08-23
EP0668222A3 EP0668222A3 (fr) 1996-05-15
EP0668222B1 EP0668222B1 (fr) 1998-06-10

Family

ID=6510630

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95101665A Expired - Lifetime EP0668222B1 (fr) 1994-02-19 1995-02-08 Récipient flexible en matière synthétique thermoplastique pour produits pouvant s'écouler

Country Status (3)

Country Link
EP (1) EP0668222B1 (fr)
AT (1) ATE167156T1 (fr)
DE (2) DE4405301A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2306142A1 (fr) * 1975-04-03 1976-10-29 Boracier Sa Poche pliable; procede et moule pour sa fabrication
GB1510490A (en) * 1974-09-09 1978-05-10 Rheem Au Ltd Foldable liner for containers
DE2802079A1 (de) * 1977-01-20 1978-07-27 Rene Erb Faltbehaelter

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1510490A (en) * 1974-09-09 1978-05-10 Rheem Au Ltd Foldable liner for containers
FR2306142A1 (fr) * 1975-04-03 1976-10-29 Boracier Sa Poche pliable; procede et moule pour sa fabrication
DE2802079A1 (de) * 1977-01-20 1978-07-27 Rene Erb Faltbehaelter

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
DIETZ ET AL. 'VERPACKUNGSTECHNIK' 1985 , DR. ALFRED H]THIG VERLAG , HEIDELBERG * Seite 193 * *

Also Published As

Publication number Publication date
ATE167156T1 (de) 1998-06-15
DE59502448D1 (de) 1998-07-16
DE4405301A1 (de) 1995-08-24
EP0668222A3 (fr) 1996-05-15
EP0668222B1 (fr) 1998-06-10

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