EP3720778A1 - Recipient a fond petaloïde - Google Patents
Recipient a fond petaloïdeInfo
- Publication number
- EP3720778A1 EP3720778A1 EP18803445.8A EP18803445A EP3720778A1 EP 3720778 A1 EP3720778 A1 EP 3720778A1 EP 18803445 A EP18803445 A EP 18803445A EP 3720778 A1 EP3720778 A1 EP 3720778A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- container
- distance
- dome
- section
- central
- 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
Links
- 239000004033 plastic Substances 0.000 claims abstract description 5
- 229920003023 plastic Polymers 0.000 claims abstract description 5
- 239000000463 material Substances 0.000 abstract description 12
- 101150029607 SS18L1 gene Proteins 0.000 abstract 2
- 230000037361 pathway Effects 0.000 abstract 2
- 229920000139 polyethylene terephthalate Polymers 0.000 description 6
- 239000005020 polyethylene terephthalate Substances 0.000 description 6
- 238000000071 blow moulding Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- -1 polyethylene terephthalate Polymers 0.000 description 2
- 230000000930 thermomechanical effect Effects 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 235000014171 carbonated beverage Nutrition 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
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
- 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
- B65D1/0223—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by shape
- B65D1/0261—Bottom construction
- B65D1/0284—Bottom construction having a discontinuous contact surface, e.g. discrete feet
Definitions
- the invention relates to the field of containers, especially bottles or jars, manufactured by blow molding or stretch blow molding from preforms or intermediate containers of plastics material such as polyethylene terephthalate (PET).
- PET polyethylene terephthalate
- a container generally comprises an open neck, by which one fills or empties it, a body, which gives the container its volume, and a bottom which closes the body opposite the neck and forms a base for ensuring the holding and holding the container when it rests on a support such as a table.
- Certain contents typically carbonated beverages, generate high relative pressures in the clogged containers, which usually reach or exceed two and a half bars.
- petaloid bottom containers which include projecting feet, shaped petals, separated by convex wall portions called valleys or valleys, which extend radially from an area central bottom.
- the feet are intended to ensure the stable holding of the container on a support, while the valleys are intended to absorb the forces (thermal and / or mechanical) exerted by the content.
- a petaloid bottom is by construction more resistant to deformations than an ordinary bottom.
- the conditions, including temperature and humidity, to which some containers are subjected sometimes bring the material beyond its elastic limit, or even to the point of rupture. Such conditions are encountered especially in some hot countries.
- the storage of a container in full sun dilates the contents and substantially increases the relative pressure inside the container, to reach or exceed four or five bars.
- PET undergoes a significant moisture recovery which reduces its dimensional stability.
- a solution that seems obvious to increase the resistance of a petaloid bottom is to increase its thickness, that is to say the amount of material used for its manufacture.
- the first difficulty is the need, for economic and environmental reasons, to keep the quantity of material at a reasonable level (manufacturers are even asked not to increase the quantity of material, or even to reduce it).
- the second difficulty is that the increase in the thickness of the bottom changes its forming conditions and requires, in order to obtain a good impression, to increase the blowing pressure of the container.
- An object of the present invention is therefore to provide a petaloid bottom container whose shape makes it more mechanically efficient, and more precisely more resistant to deformation when subjected to high temperature and / or humidity conditions.
- a plastic container comprising a body and a petaloid bottom which connects to the body by a periphery, the bottom having a central axis of symmetry and comprising:
- a central dome protruding inwardly of the container bounded by a circular outer edge extending at a distance R1 from the central axis;
- a series of legs projecting outwardly of the vessel each radiating from the central dome and each having a radially remote top of the central dome and a ridge path extending from the outer edge of the central dome to the summit ; a series of valleys formed each hollow between two successive feet, each valley radiating from an inner end to the periphery;
- An inner section which extends from the outer edge of the dome to a junction which extends at a distance R2 from the central axis, this inner section having, in a median radial plane of the foot, a first camber;
- An outer section extending from the junction in the tangent extension of the inner section to the top, this outer section having, in the median radial plane of the foot, a second camber greater than the first camber;
- Such a structure gives the bottom a resistance, particularly thermomechanical, higher than that known petaloid bottoms, and makes, for equivalent amount of material, the bottom more resistant to the conditions of temperature and / or high humidity, encountered in particular in tropical countries.
- the ratio R1 / R2 can be between 45% and 55%.
- each foot extends at a distance R3 from the central axis and the distances R1 and R3 are in a ratio such that:
- the distances R1 and R3 are advantageously in a ratio R1 / R3 of about 27%.
- each valley is spaced from the outer edge of the central dome by a distance E.
- This distance E and the distances R1 and R2 are advantageously in a relation such that 45% ⁇ E / (R2-R1) ⁇ 55%, with preferably E / (R2-R1) o 50%.
- the bottom has a connection fillet between the inner end of each valley and the outer edge of the central dome.
- the peak path has a width L1
- the valley has a width L2 such that 60% ⁇ L1 / L2 ⁇ 210%.
- the widths L1 and L2 are preferably equal or substantially equal.
- a median point of the crest path and a median point of the valley are spaced, on the one hand, axially from a distance H and on the other hand, in a transverse plane perpendicular to the central axis, a distance G, such that 20% ⁇ H / G ⁇ 30%.
- the distances H and G are advantageously in a ratio H / G of about 25%.
- the outer section of the ridge path is preferably straight, and forms with an transverse plane perpendicular to the central axis an angle of between 21 ° and 24 °, and e.g. about 22.5 °.
- FIG.1 is a perspective view, from below, of a container provided with a petaloid bottom;
- FIG. 2 is a detail view, in perspective, showing the bottom on a larger scale
- FIG. 3 is a plan view of the bottom of the container
- FIG.4 is a sectional view of the bottom of FIG.3, according to the section plane IV-IV;
- FIG. 5 is a detailed view, on a larger scale, of the bottom of FIG. 3, taken in the medallion V;
- FIG.6 is a detail view in section of the bottom made in a median radial plane of a foot
- FIG.7 is a detail view in section of the bottom made in a median radial plane of a valley.
- FIG. 1 is shown, in perspective from below, a container 1 made of plastic material (it is in this case a bottle).
- the container 1 is obtained by forming (blowing or stretching) from a thermoplastic polymer preform, e.g. polyethylene terephthalate (PET). Before forming, the preform is preheated before the material reaches a temperature greater than its glass transition temperature (which is about 80 ° C in the case of PET).
- a thermoplastic polymer preform e.g. polyethylene terephthalate (PET).
- PET polyethylene terephthalate
- the container 1 extends along a central axis X. It comprises a side wall called body 2, and a bottom 3 petaloid which closes the container 1 at a lower end of the body 2.
- the bottom 3 has a periphery 4 through which it connects to the body 2.
- the bottom 3 has a central axis of symmetry which, in the presented configuration, coincides with the central axis X of the container 1.
- the bottom 3 comprises, in the first place, a central dome 5 which projects towards the interior of the container 1.
- the dome 5 is in the form of a toric or hemispherical cap, the concavity of which is turned towards the outside of the container 1.
- Dome 5 has the particular function of stretching the material in the center of the bottom 3, so as to increase the crystallinity and therefore the mechanical strength.
- the bottom 3 comprises, secondly, a series of feet 8 projecting outwardly of the container 1, which radiate from the central dome 5.
- Each foot 8 has a vertex 9, which is its most prominent part.
- Each foot 8 is bordered laterally, on either side, by a pair of flanks 10 of substantially triangular shape.
- the vertices 9 extend in a common plane P, called the laying plane, through which the container 1 can rest on a flat surface (for example a table).
- Each foot 8 has a facet called ridge path 11, which extends radially sloping from the outer edge 7 of the central dome 5 to the apex 9.
- Each ridge path 11 has, from the inside (i.e., the central X axis side) outward (i.e. periphery 4), two successive sections, namely an inner section 12 and an outer section 13, which are connected to a junction 14.
- the inner section 12 extends from the outer edge 7 of the dome 5 to the junction 14 with the outer section 13.
- the inner section 12 has, in a median radial plane of the foot (corresponding to the sectional plane of FIG.4 and FIG.6), a first camber C1. If the internal section 12 has a circular contour (when seen in section in the median radial plane), the first camber C1 corresponds to the radius of curvature of the internal section 12. Otherwise, the first camber C1 can be considered as being the average of the curvature of the internal section 12, measured in the median radial plane.
- the outer section 13 extends from the junction 14 with the internal section 12, in the tangent extension thereof, and to the top 9 of the foot 8.
- the outer section 13 has, in the median radial plane of the foot 8 (corresponding to the sectional plane of FIG.4 and FIG.6), a second camber C2. If the inner section 13 is circular (when seen in section in the median radial plane), the second camber C2 corresponds to the radius of curvature of the internal section 13. Otherwise, the second camber C2 can be considered as being the average of the curvature of the outer section 13 measured in the median radial plane.
- the second camber C2 is greater than the first camber
- the outer section 13 is straight - that is, the second camber C2 is infinite.
- the outer section advantageously forms, with any transverse plane perpendicular to the central X axis, an angle A between 21 ° and 24 °, and preferably about 22.5 ° (FIG.4).
- the position of the junction 14 between the internal section 12 and the internal section 13 is in line with the size of the dome 5. More precisely, the distances R1 and R2 are in a ratio such that: 45% ⁇ R1 / R2 ⁇ 60%
- the ratio R1 / R2 is rather between 45% and 55%.
- the ratio R1 / R2 is about 50%.
- the vertices 9 are located radially recessed with respect to the periphery 4 of the bottom 3.
- the diameter D3 is smaller than the overall diameter of the bottom 3 (which, in the example illustrated, corresponds to to the overall diameter of the container 1).
- the distances R1 and R3 are advantageously in a ratio such that 25% ⁇ R1 / R3 ⁇ 35%
- the distances R1 and R3 are preferably in a ratio R1 / R3 of about 27%.
- the bottom 3 comprises, thirdly, a series of valleys 15 each formed hollow between two successive feet 8. Each valley 15 is connected to each of the flanks 10 which border it by a leave
- Each valley radiates from an inner end 17 to the periphery 4 of the bottom 3.
- each valley 15 is spaced from the outer edge 7 of the central dome 5 by a distance E.
- E the distance
- the inner end 17 of each valley 15 is spaced from the outer edge 7 of the central dome 5 by a distance E.
- the inner end 17 of each valley 15 is spaced from the outer edge 7 of the central dome 5 by a distance E.
- the inner end 17 of each valley 15 is spaced from the outer edge 7 of the central dome 5 by a distance E.
- E According to a preferred embodiment illustrated in FIG. appears rounded at its inner end 17, when the bottom is seen from below.
- each peak path 11 has a width L1.
- each valley 15 advantageously has a width L2 such that 60% ⁇ L1 / L2 ⁇ 210%.
- the value of the ratio L1 / L2 can in particular depend on the volume capacity (and therefore the overall diameter) of the container 1.
- the widths L1 and L2 are advantageously equal. (i.e., the gap between L1 and L2 is less than 5%) or substantially equal (i.e. the difference between L1 and L2 is between 5% and 10%) .
- H the distance, measured axially, between the points M1 and M2 (and more exactly between the transverse planes perpendicular to the central X axis and passing respectively through the point M1 and the point M2);
- G the distance separating M1 and M2 in a transverse plane perpendicular to the X axis (and more precisely the distance separating the axial projections of M1 and M2 in such a plane, which corresponds e.g. in the plane of FIG. 5).
- the distances H and G are advantageously in a ratio H / G such that 20% ⁇ H / G ⁇ 30%.
- the distances H and G are preferably in an H / G ratio of about 25%.
- the bottom 3 has a higher thermomechanical resistance than a petaloid bottom current, equivalent amount of material. Specifically, tests have shown that the bottom 3 is more resistant to temperature and / or high humidity conditions.
- the presence of the dome 5 is here necessary for the structural rigidity of the bottom 3. If the junction 14 was too close to the outer edge 7 thereof, the transition between the internal section 12 of the ridge path 11 and the dome would be too brutal and then one would notice the appearance of a concentration of stresses on the internal section 12. If instead the junction 14 was too close to the foot 8, the bottom 3 would be too low height and offer insufficient mechanical strength.
- the spacing distance E between the valleys 15 and the dome 5 also allows, via the connection fillet 18, to ensure a smooth transition between them. Bringing the inner end of the valleys 15 of the dome 5 would reduce the radius of the fillet 18 and increase the concentration of stress on it. At the extreme, opening the valleys on the central dome would create a peak of stress at the junction between the valleys and the dome.
- the ratio H / G quite low, and the ratio L1 / L2, on the contrary rather high, also contribute (although indirectly and in a secondary way), to the softness of the curves of the bottom 3 and thus to the distribution of the efforts on the -this. It is even noted that when the container 1 filled and plugged is subjected to conditions of temperature (greater than 40 °) and / or humidity (greater than 50%) high, the bottom 3 is deployed slightly (that is, that is, the diameter D3 widens somewhat) and uniformly. This results in an increase in the base of the container 1, in favor of its stability.
Landscapes
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Containers Having Bodies Formed In One Piece (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1761577A FR3074482B1 (fr) | 2017-12-04 | 2017-12-04 | Recipient a fond petaloide |
PCT/EP2018/082033 WO2019110301A1 (fr) | 2017-12-04 | 2018-11-21 | Recipient a fond petaloïde |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3720778A1 true EP3720778A1 (fr) | 2020-10-14 |
EP3720778B1 EP3720778B1 (fr) | 2022-03-23 |
Family
ID=61521639
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP18803445.8A Active EP3720778B1 (fr) | 2017-12-04 | 2018-11-21 | Recipient a fond petaloïde |
Country Status (5)
Country | Link |
---|---|
US (1) | US11390414B2 (fr) |
EP (1) | EP3720778B1 (fr) |
CN (1) | CN111448144A (fr) |
FR (1) | FR3074482B1 (fr) |
WO (1) | WO2019110301A1 (fr) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2967975B1 (fr) * | 2010-11-25 | 2012-12-28 | Sidel Participations | Fond de recipient petaloide combine |
FR2998877B1 (fr) * | 2012-11-30 | 2014-12-26 | Sidel Participations | Recipient ayant un fond muni d'une voute a double decrochement |
FR3005035B1 (fr) * | 2013-04-24 | 2016-01-15 | Sidel Participations | Recipient muni d'un fond deformable a double arche |
FR3007392B1 (fr) * | 2013-06-25 | 2016-02-05 | Sidel Participations | Recipient mini petaloide rainure |
FR3013335B1 (fr) * | 2013-11-15 | 2016-01-15 | Sidel Participations | Recipient en matiere thermoplastique a fond de type petaloide a soufflabilite augmentee |
FR3032946B1 (fr) | 2015-02-23 | 2017-02-10 | Sidel Participations | Recipient muni d'un fond mini petaloide a cannelures transversales |
-
2017
- 2017-12-04 FR FR1761577A patent/FR3074482B1/fr active Active
-
2018
- 2018-11-21 EP EP18803445.8A patent/EP3720778B1/fr active Active
- 2018-11-21 CN CN201880078399.1A patent/CN111448144A/zh active Pending
- 2018-11-21 US US16/769,957 patent/US11390414B2/en active Active
- 2018-11-21 WO PCT/EP2018/082033 patent/WO2019110301A1/fr unknown
Also Published As
Publication number | Publication date |
---|---|
FR3074482B1 (fr) | 2019-10-18 |
FR3074482A1 (fr) | 2019-06-07 |
US11390414B2 (en) | 2022-07-19 |
EP3720778B1 (fr) | 2022-03-23 |
US20210197997A1 (en) | 2021-07-01 |
WO2019110301A1 (fr) | 2019-06-13 |
CN111448144A (zh) | 2020-07-24 |
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