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
  • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
  • B65D77/04—Articles or materials enclosed in two or more containers disposed one within another
  • B65D77/0446—Articles or materials enclosed in two or more containers disposed one within another the inner and outer containers being rigid or semi-rigid and the outer container being of polygonal cross-section not formed by folding or erecting one or more blanks
  • B65D77/0453—Articles or materials enclosed in two or more containers disposed one within another the inner and outer containers being rigid or semi-rigid and the outer container being of polygonal cross-section not formed by folding or erecting one or more blanks the inner container having a polygonal cross-section
  • B65D77/0466—Articles or materials enclosed in two or more containers disposed one within another the inner and outer containers being rigid or semi-rigid and the outer container being of polygonal cross-section not formed by folding or erecting one or more blanks the inner container having a polygonal cross-section the containers being mounted on a pallet
• • 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
  • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
  • B65D77/04—Articles or materials enclosed in two or more containers disposed one within another
  • B65D77/06—Liquids or semi-liquids or other materials or articles enclosed in flexible containers disposed within rigid containers

Definitions

• the invention relates to a pallet container with a thin-walled rigid inner container made of thermoplastic material for the storage and transport of liquid or flowable filling materials, with a space-tight enclosing the plastic container as a supporting jacket and with a floor pallet on which the plastic container rests and with which the supporting jacket is firmly connected.
• a space-tight enclosing the plastic container as a supporting jacket and with a floor pallet on which the plastic container rests and with which the supporting jacket is firmly connected.
• Such pallet containers with a welded tubular support jacket are generally known, for. B. EP 0 734 967 A (Seh).
• the trellis support jacket of the pallet container known from this consists of a round raw r-profile, which is strongly compressed at the welded intersections.
• Another pallet container is known from DE 297 19 830 U1 (vL), the lattice bars of which have a tube profile which deviates from the circular cross section, but which is expressly intended to have a cross section which is constant over the entire length without any indentations or cross-section-reducing indentations.
• Another pallet container with a lattice frame made of open profile bars is known from DE 196 42 242 A.
• the lattice jacket is fastened to the floor pallet, which can be designed as a flat pallet made of plastic, wood or tubular steel frame, usually by means of fasteners such as, for example, gripping over or through the lower, horizontally circumferential frame tube.
• fasteners such as, for example, gripping over or through the lower, horizontally circumferential frame tube.
• the fasteners are nailed, pinned, screwed or welded onto the top plate or the upper outer edge of the pallet.
• IBC Intermediate Bulk Containers
• This is intended on the one hand to enable the pallet container to be used for dangerous liquid or flowable filling goods up to class 6 (highest approval quality).
• the possibility should be created to be able to design the lattice jacket with less vertical and / or horizontal lattice bars without reducing the mechanical strength.
• the tubular bars have a closed profile with a trapezoidal cross section, with a longer and a shorter parallel wall and two straight, mutually oblique walls which, starting from the longer parallel wall and tapering towards the shorter parallel wall, the apex angle formed by the two straight, obliquely tapering side walls of the tubular profile being between 20 ° and 45 °, preferably approximately 36 °.
• the closed trapezoidal tubular profile has a high profile Bending moment of resistance and on the other hand also a high torsional moment of resistance due to the slightly inclined profile side walls.
• the height / width ratio (H / W) of the trapezoidal tubular profile is between 0.8 and 1.0, preferably approximately 0.86.
• the design of the pallet container according to the invention creates the possibility for foreseeable normal transport stresses of being able to design the lattice jacket with a total of only 5 instead of 6 horizontal lattice bars without a noticeable reduction in the mechanical strength.
• the longer parallel wall of the trapezoidal tubular profile is partially molded inward in the area of a crossing point of two tubular rods over a length of approximately two profile tube widths such that an outwardly projecting rounding (bulge) is formed on the two outer longitudinal edges , so that four points of contact are formed at each crossing point of the horizontally and vertically extending bars, which are firmly connected to one another after welding, the (longer), opposing parallel walls in each tube bar crossing being spaced apart from one another even after welding and do not touch.
• the continuously molded trapezoidal profile has proven itself extremely well with built prototypes.
• the longer parallel wall of the trapezoidal tubular profile is only partially molded inwards in the region of a crossing point, and in the other tubular rod, the longer parallel wall of the trapezoidal tubular profile is molded inwards over the entire tube length is. This can already be completely sufficient for medium load cases.
• the depth of the profiling of the longer parallel wall is approximately twice the wall tube thickness; in the case of an executed pallet container, the profile tube wall thickness is 1 mm and the depth A of the indentation is also 1 mm, so that after welding - in which the points of contact of the crossing bars merge into each other by approx. 1 mm - it is ensured that the opposing long ones Parallel walls in each pipe rod intersection are still spaced apart by approx. 1 mm after welding and do not touch. This is considered particularly important because pallet containers are often stored outdoors and are exposed to the weather. Due to the spacing of the bars from one another at the welding points, adhering rainwater can dry out quickly and rust formation is largely avoided. In the case of welded surfaces lying against one another, inevitable rust nests would be formed, which would lead to severe rust contamination of the bars in the shortest possible time.
• the trapezoidal tubular profile on the side of the longer parallel wall has at least one indentation arranged at a distance laterally next to a welding point.
• This indentation represents a reduction in the tube profile height H and serves to relieve the sensitive welding points against the critical peak values of the changing bending stresses in the event of dynamic vibration stress.
• an indentation is formed on each side next to a welding point, which is in each case at least a distance of approximately one tenth of the tubular profile width B.
• the special design of the tubular profile with the stress-relieving indentations on the side next to the welding points substantially relieves the stress on the welded joints under static and / or dynamic loads, the welding points not being arranged in a deformation area and maintaining their high bending stiffness.
• a special feature of the present invention is that: in contrast to known tube profiles, the tube profile is not partially pressed in at the welding points, but is at a distance next to the welding points, on the same or / and on the opposite profile side with corresponding indentations or Provide indentations in order to reduce the bending resistance moment compared to the crossing points to relieve the welded connections of the lattice bars under static and / or dynamic loading.
• the trapezoidal profile is designed so that it can be pressed in easily and without large material shifts.
• the welding with a second pipe stiffens the pipe with material embrittlement at this point and it is precisely at this welding point that it is extremely sensitive to vibration.
• a not insignificant vibration load such as. B. in a truck transport the filled pallet container on a poor route, can quickly lead to breakage of the weld or the pipe at the weld.
• target vibration points are not formed directly at or in the vicinity thereof, but at least at a short distance from the welding points of the crossing points.
• These set vibration points created by indentation are in any case less than 50% of the pipe cross section. They are in the range of 10% to 45% of the height of the pipe cross-section, preferably approximately 1/3 (33%). This only moderately reduces the bending stiffness of the molded pipe cross-sections, but significantly reduces the susceptibility to fatigue cracks.
• FIG. 1 a front view of a pallet container according to the invention
• FIG. 2 shows a test pallet container in a side view
• FIG. 3 shows an enlarged partial sectional view of the trapezoidal profile according to the invention at a pipe crossing point
• FIG. 4 shows a further enlarged partial sectional view of a preferred trapezoidal profile at a pipe crossing point
• FIG. 5 shows a schematic sectional illustration with the hydrodynamic pressure effect of the liquid filling material on the side wall of the container
• FIG. 6 shows a horizontal partial sectional illustration at the point of greatest lattice deflection
• FIG. 7 shows an enlarged illustration of a pipe crossing point with indentations
• Figure 8 shows a trapezoidal tube cross-section acc. View D from FIG. 7,
• FIG. 9 a shows an indentation of the trapezoidal tube cross section (narrow side) C-C
• FIG. 9 b shows an indentation of the trapezoidal tube cross section (broad side) C-C
• FIG. 10 a square tube profile - unloaded
• Figure 11 shows the square tube profile. 10 - overloaded
• FIG. 12 shows a tube profile according to the invention - unloaded
• Figure 13 shows the tube profile according to the invention.
• FIG. 14 another tube profile according to the invention.
• Figure 15 shows another tube profile according to the invention.
• Figure 16 is a partial plan view of a corner bend of a tubular profile according to the invention.
• reference number 10 denotes a pallet container according to the invention, which has a thin-walled, blow-molded rigid inner container 12 made of thermoplastic (HD-PE) with an upper fill opening and one which seals the inner container 12 enclosing tubular frame 14 which is fixed - but detachable or replaceable - connected to the floor pallet 16.
• the front view shown shows the narrow side of the pallet container 10 with the outlet valve near the bottom in the plastic container 12.
• the lower front edge of the bottom pallet 16, here designed as a wooden column (US runner), with the outlet valve 18 located above it represents the most sensitive point on the pallet container, which is the subject of approval tests greatest loads z. B. is exposed to a diagonal fall.
• FIG. 3 shows in a crossover area a closed tubular rod profile 18 according to the invention with a trapezoidal cross-section, with a longer and a shorter wall 20, 22 which runs parallel to one another and two straight walls 24 which run obliquely to one another and which start obliquely from the longer parallel wall 22 connect to the shorter parallel wall 20 in a converging manner, the apex angle 26 formed by the two straight, inclined side walls of the tubular profile 18 being between 20 ° and 45 °, preferably approximately 36 °.
• the height / width ratio of the trapezoidal tubular profile is between 0.8 and 1.0 - preferably approximately 0.86.
• the distance between the intersection of the elongated straight line of the walls 24, which run at an angle to one another, at the apex angle 26 is approximately one profile height H, measured from the shorter parallel wall 20, or approximately 2 H measured from the longer parallel wall 22 The distance can be between 0.75 and 2.5 H.
• a preferably used trapezoidal profile 18 is shown in FIG. 4.
• the longer parallel wall 22 is only partially formed in the area of a crossing point of two tubular rods in such a way that an outwardly projecting curve 28 (bulge) is formed on the two outer longitudinal edges that at each crossing point of the horizontally and vertically extending bars four contact points are formed, which are firmly connected to each other after welding, the (longer), opposing parallel walls 22 are still spaced apart from each other in each tubular bar crossing even after welding and not touch.
• the longer parallel wall 22 is formed inwards over the entire length of the lattice bars, the outwardly projecting curves 28 (bulge) being formed on the two outer longitudinal edges.
• the continuously molded trapezoidal profile 18 has proven itself extremely well in the prototypes built and is made from a round tube with an 18 mm diameter (56.55 mm circumferential length).
• the depth of the shaping of this longitudinal profiling should be approximately twice the profile tube wall thickness; in a pallet container, the profile tube wall thickness is 1 mm and the depth of the indentation is 1 mm.
• the pipe rods are welded at each pipe crossing via the four contact points using electrical resistance pressure welding.
• This is considered particularly important because pallet containers are often stored outdoors and are exposed to the weather. Due to the spacing of the bars from one another at the welding points, adhering rainwater can quickly dry off again through air and rust formation is largely avoided. When welding surfaces are in contact with one another, unavoidable rust nests are formed, which can quickly lead to severe rust contamination of the entire cage. From this cross-sectional representation it is also clear that the (longer) parallel wall 22 remaining between the outwardly projecting curves 28 has approximately the same width B1 as the opposite (shorter) parallel wall 20.
• the schematic representation in FIG. 5 illustrates the changing deformation deflection of the lattice jacket due to dynamic vibration loading.
• the hydrostatic internal pressure of the liquid filling material - illustrated in the right half of the picture - has the effect that the maximum lattice deflection Da, Di takes place approximately at the level of the center of gravity of the product S, ie approximately 33% of the lattice frame height, and that the vibration amplitude at this height is approximately twice as large on the outside as on the inside. This is the reason why there is the greatest risk of cracks in the area of the lower lattice frame half when the lattice bars are subjected to vibrations.
• the vibration deflection is unhindered on the outside, while the liquid column and the opposite side wall oppose it on the inside.
• the lower circumferential horizontal bars 30 are subject to large bending loads, particularly in the vicinity of the corner arches 38.
• FIG. 7 the crossing point 36 of a horizontal tubular bar 30 and a vertical tubular bar 32 is shown - as an interior view of the lattice cage.
• the four welding points are identified with small crosses.
• the trapezoidal tubular profile of the horizontal bar 30 as well as of the vertical bar 32 is provided on both sides directly next to the crossing point 36 or the welding points, each with an indentation 34, the indentations 34 being spaced apart from the intersection point 36 by at least one tenth of the tubular profile width B. are.
• the view D of the undeformed trapezoidal profile 18 is shown in FIG. 8 and a sectional view through the indentation 34 according to line C - C can be seen in FIG. 9b.
• the indentations 34 can be introduced into the profiled tube on the side of the (“longer”) parallel wall 22 (FIG. 9b) or / and on the side of the opposite (shorter) parallel wall 20 according to FIG. 9a.
• it is important that the tube profile is not pressed or deformed at the crossing point or the welding points themselves, but only next to them.
• the depth T of an indentation 34 should be as small as possible in reducing the profile height H, i.e. H. be held between 15% and 50%; in a preferred embodiment, the depth T of an indentation is approximately 33% of the profile height H.
• the longitudinal extent of an indentation 34 should be approximately between one and a half times and three times the profile width B in the longitudinal direction of the bar, in the preferred embodiment the longitudinal extent of an indentation 34 is approximately twice the profile width B.
• FIG. 10 shows an unloaded tubular profile - here a known profile that is square over the entire length. After a comparatively short time Dynamic vibration load shows in the horizontal bar 30 ' that cracks form directly at the crossing point or at the welding points, as is illustrated in FIG. 11.
• the vertical profile tubes are arranged on the inside and the horizontal profile tubes on the outside of the lattice jacket. Cracks and breaking points always occur in the area of the intersection directly next to the welding points (see Fig. 2, circles drawn in there). Cracking always begins with the vertical tubular bars - referred to the lattice jacket - from the outside and migrates inwards and begins with the horizontal bars always from the inside and migrates outwards.
• FIG. 12 shows a closed trapezoidal profile 18 according to the invention with two indentations 34 in the horizontal bar 30.
• FIG. 13 in an exaggerated representation - no cracking occurs even after a longer period of exposure to vibrations. This is on the one hand due to the fact that the intersection area at the welding points is free from debilitating indentations and is therefore very stable, while on the other hand the indentations 34 which reduce the bending resistance moment act as a "bending hinge" and are arranged at least a short distance from the intersection area and the peak stresses Keep away from the sensitive welding spots and move them to more elastic areas.
• the round tube lattice frame of a known pallet container is provided with indentations at least at the welded tube crossing points.
• the assessment expressed in the utility model on page 2 below, that "due to the use of a profiled tube according to the invention (there without local deformations) there are no longer local stress concentrations" is not, according to the knowledge of the present invention correct and shows that the reciprocal relationship between bending stiffness and vibration elasticity in case of trellis frames exposed to transport loads was obviously not recognized by pallet containers.
• the depth T of the indentations 34 is between approximately 25% and 50%, preferably approximately 33% of the tube profile height H.
• FIG. 14 shows an embodiment variant with two indentations 34 on the profile tube side facing away from the welding points with the short parallel wall 20, which — as shown in FIG. 15 — is modified there to a particularly advantageous embodiment variant.
• the trapezoidal tubular profile 18 is provided on the side of the shorter parallel wall 20 and on the side of the longer parallel wall 22, in each case laterally next to an intersection 36 with indentations 34 in such a way that these indentations 34 lie exactly opposite one another.
• the indentations 34 are each at least a distance of approximately one tenth of the tube profile width B from the crossing point 36. If the indentations 34 are introduced into the profile tube from both sides 20, 22 which run parallel to one another, then the "hinge effect" or the elasticity of the profile tube is particularly reinforced at this point.
• the indentations 34 in the tubular rods 30, 32 can vary in depth or / and depending on the intensity of the expected dynamic vibration load in different areas of the tubular frame 14 or / and in the horizontal and vertical tubular rods 30, 32 be trained in different places.
• FIG. 16 Another important embodiment for reducing the harmful effect of a dynamic vibration load on the horizontal lattice bars is illustrated in FIG. 16.
• the horizontal tubes 30 of the lattice frame 14 are flattened in the corner regions 38, which are curved by 90 °, parallel to the vertical direction and also act as a hinge-like "bending joint".
• the horizontal tubes need not have a high bending moment in the corner areas or perpendicular to the vertical direction; rather, greater elasticity is of greater importance here.
• Particularly good test results have been achieved with pallet containers in which the horizontal lattice tubes 30 are flattened in the corner regions 38 of the support jacket 14 by 90 ° from the inside and / or from the outside by at least a quarter of the height H of the profile cross section 18 are.
• the horizontal tubes in the lower region of the lattice frame are flattened by 30% from the inside and by 45% from the outside of the corner arch, while the flats in the upper region of the lattice frame are gradually reduced.

Priority Applications (11)

Applications Claiming Priority (6)

Related Child Applications (1)

Publications (2)

Family

ID=27219467

Family Applications (2)

Family Applications After (1)

Country Status (16)

Cited By (1)

Families Citing this family (12)

Citations (3)

Family Cites Families (6)

• 2001
  • 2001-05-21 AU AU2001279623A patent/AU2001279623A1/en not_active Abandoned
  • 2001-05-21 HU HU0302064A patent/HUP0302064A3/hu unknown
  • 2001-05-21 BR BR0111276-7A patent/BR0111276A/pt not_active IP Right Cessation
  • 2001-05-21 IL IL15301801A patent/IL153018A0/xx unknown
  • 2001-05-21 MX MXPA02011546A patent/MXPA02011546A/es not_active Application Discontinuation
  • 2001-05-21 WO PCT/EP2001/005789 patent/WO2001089954A2/de not_active Application Discontinuation
  • 2001-05-21 EP EP01957800A patent/EP1289853A2/de not_active Withdrawn
  • 2001-05-21 CA CA002411207A patent/CA2411207A1/en not_active Abandoned
  • 2001-05-21 CZ CZ20024238A patent/CZ20024238A3/cs unknown
  • 2001-05-21 CN CNB01813338XA patent/CN1221448C/zh not_active Expired - Fee Related
  • 2001-05-23 AU AU2001269033A patent/AU2001269033B2/en not_active Expired
  • 2001-05-23 KR KR1020027015831A patent/KR100772568B1/ko active IP Right Grant
  • 2001-05-23 AU AU6903301A patent/AU6903301A/xx active Pending
  • 2001-05-23 DK DK01947309T patent/DK1289852T3/da active
  • 2001-05-23 DE DE50109821T patent/DE50109821D1/de not_active Expired - Lifetime
  • 2001-05-23 AT AT01947309T patent/ATE326399T1/de active
  • 2001-05-23 ES ES01947309T patent/ES2265432T3/es not_active Expired - Lifetime
  • 2001-05-23 MX MXPA02011521A patent/MXPA02011521A/es active IP Right Grant
  • 2001-05-23 CA CA002409852A patent/CA2409852C/en not_active Expired - Lifetime
  • 2001-05-23 HU HU0302022A patent/HU227866B1/hu unknown
  • 2001-05-23 IL IL15301901A patent/IL153019A0/xx active IP Right Grant
  • 2001-05-23 CZ CZ20024239A patent/CZ303276B6/cs not_active IP Right Cessation
  • 2001-05-23 EP EP01947309A patent/EP1289852B1/de not_active Expired - Lifetime
  • 2001-05-23 WO PCT/EP2001/005908 patent/WO2001089955A1/de active IP Right Grant
  • 2001-05-23 BR BRPI0111277-5A patent/BR0111277B1/pt not_active IP Right Cessation
• 2002
  • 2002-11-25 NO NO20025649A patent/NO324243B1/no not_active IP Right Cessation
  • 2002-11-25 NO NO20025648A patent/NO20025648L/no not_active Application Discontinuation

Patent Citations (3)

Also Published As

Similar Documents

Legal Events