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—Rigid or semi-rigid 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 or 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
• • 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
  • B65D23/00—Details of bottles or jars not otherwise provided for
  • B65D23/001—Supporting means fixed to the container

Definitions

• Container comprising a ribbed arched bottom
• the invention relates to the manufacture of containers, such as bottles or pots, obtained by blow molding or stretch blow molding from thermoplastic preforms.
• the manufacture, by blowing, of a container generally consists in introducing into a mold to the imprint of the container a blank (term designating either a preform or an intermediate container obtained by pre-blowing a preform) previously heated to a temperature greater than the glass transition temperature of the material, and to inject into the blank a gas (such as air) under pressure (equal to or greater than 15 bar).
• a gas such as air
• the blowing can be completed by preliminary stretching of the blank by means of a sliding rod.
• the double molecular orientation that the material undergoes during blowing gives the container a certain structural rigidity.
• a well-known method of increasing the stiffness of a container is heat-setting, which involves heating the mold wall to thermally increase the crystallinity level.
• This method illustrated by the French patent FR 2 649035 (Sidel) and its US equivalent US 5,145,632, is used in particular for HR applications (heat resistant), in which the container is filled hot.
• Another technical solution for increasing the structural rigidity of a container is to stretch the bottom of the container, by means of a special mold equipped with a mold bottom movable in translation which pushes the material (see in particular the European patent EP 1 069983). Overdrawing induces an increase in the rate of deformation of the material and therefore a mechanical increase in its crystallinity.
• boxing requires that more material is allocated to the bottom, otherwise the structural rigidity induced by the over-stretching of the material will be burdened by its thinning. In addition to the induced overweight, it is necessary to raise the blowing pressure to conform the bottom.
• bottom boxing is generally coupled with heat-setting, since it makes it possible to form deformable membranes that absorb the variations in volume of the container accompanying the retraction of the liquid initially filled with heat.
• An object of the invention is to improve, at equal or lower weight, the mechanical performance of a container.
• the invention provides a plastic container, provided with a body and a bottom extending at a lower end of the body, the bottom comprising:
• annular seat extending substantially in the extension of the body and defining a laying plane
• this vault comprising a series of stiffeners which extend radially from a central area of the bottom to the seat.
• Such a container has increased stability and rigidity, thanks in particular to the combination of the wide seat (in the extension of the body) and the stiffened arch.
• the stiffeners extend to an inner annular cheek substantially perpendicular to the laying plane.
• the axial dimension of the cheek and the radial dimension of the laying plane are preferably equivalent, to the benefit of the stability of the container.
• the bottom may comprise an annular reinforcing lip at the junction between the seat and the roof, which joins two by two of the outer radial ends of the stiffeners.
• This annular lip has for example, in section, a V profile, projecting inwardly.
• the annular lip preferably has a local enlargement at its junction with the outer end of each stiffener.
• each stiffener thins from the central area of the bottom to the seat, and the stiffeners together form a star pattern.
• the vault comprises, for example, panels recessed between the stiffeners, and each stiffener comprises on its lateral edges double-radius connection fillets with the panels.
• FIG. 1 is a bottom view in perspective of a plastic container
• Figure 2 is a perspective view, on an enlarged scale, showing the bottom of the container of Figure 1 according to a first embodiment
• FIG. 3 is a view of a detail of the bottom of the container of Figure 2, according to inset III;
• Figure 4 is a bottom plan view of the container
• Figure 5 is a section of the bottom of the container, taken along the broken section line V-V of Figure 4;
• FIG. 6 is a sectional view of the bottom of the container, taken along the section line VI-VI of Figure 4;
• Figure 7 is a detail of the bottom section, according to inset VII of Figure 5;
• Figure 8 is a perspective view, similar to Figure 2, illustrating a second embodiment of the bottom of the container;
• Figures 9 and 10 are sectional detail views, respectively along the section plane IX-IX and XX of Figure 8;
• Figure 11 is a perspective view, similar to Figure 2, illustrating a third embodiment of the bottom of the container;
• Figures 12 and 13 are detail sectional views, respectively along the section plane XII-XII and XIII-XIII of Figure 11;
• Figure 14 is a perspective view, similar to Figure 2, illustrating a fourth embodiment of the bottom of the container;
• Figures 15 and 16 are sectional detail views respectively along the section plane XV-XV and XVI-XVI of Figure 14;
• Figure 17 is a perspective view, similar to Figure 2, illustrating a fifth embodiment of the bottom of the container;
• Figures 18 and 19 are sectional detail views respectively along the section plane XV 111 -XV 111 and XIX-XIX of Figure 17;
• Figure 20 is a perspective view, similar to Figure 2, illustrating a sixth embodiment of the bottom of the container;
• Figure 21 is a side elevational view of the bottom of Figure 20;
• Figure 22 is a perspective view, similar to Figure 2, illustrating a seventh embodiment of the bottom of the container; - Figures 23 and 24 are detailed sectional views, respectively along the sectional plane XXI 11 -XX 111 and XXIV-XXIV of Figure 22.
• Figure 1 a container 1 in this case a bottle, made by stretching blow from a thermoplastic preform such as PET (polyethylene terephthalate).
• a thermoplastic preform such as PET (polyethylene terephthalate).
• This container 1 comprises, at an upper end, a threaded neck 2, provided with a rim 3.
• the container 1 comprises in its upper part a shoulder 4 flaring in the direction opposite to the neck 2, this shoulder 4 being extended by a side wall or body 5, of generally cylindrical shape of revolution about a main axis X of the container 1.
• the container 1 further comprises a bottom 6 which extends at a lower end of the container 1.
• the base 6 comprises a seat 7 in the form of a thin annular bead which extends substantially axially in the extension of the body 5.
• seat 7 ends with a face (continuous and annular, as in the examples of Figures 2 to 19 and 22 to 24, or formed of several coplanar facets, as in the example of Figures 20 and 21) which forms the lower end of the container 1 and defines a laying plane 8 perpendicular to the axis of the container 1, by which it can rest stably on a flat surface S.
• the laying plane 8 is connected outwards to an external lateral face 9 of the seat 7 (which extends in the extension of the body) by a fillet 10 with a small radius of curvature, that is to say of the order of a millimeter.
• the seat 7 Towards the interior of the container 1, the seat 7 comprises an annular cheek 11 of a diameter D, which extends axially towards the interior of the container 1 in the extension of the laying plane 8, substantially at right angles to to it, on a height H equivalent to the width L of the laying plane 8, measured radially. More specifically, it will be ensured that the ratio between the width L of the laying plane 8 and the height H of the flange 11 is between 0.6 and 1.5:
• the laying plane 8 is connected inwardly to the cheek 11 by a fillet 12 which may be of small radius of curvature - less than or equal to about 1 mm, as in the examples of FIGS. 2 to 16 and 20 to 24 - or at medium radius - between 1 mm and 5 mm, as in the example of Figures 17 to 19.
• a fillet 12 which may be of small radius of curvature - less than or equal to about 1 mm, as in the examples of FIGS. 2 to 16 and 20 to 24 - or at medium radius - between 1 mm and 5 mm, as in the example of Figures 17 to 19.
• the bottom 6 further comprises a concave arch 13 (concavity facing the outside of the container 1 in the absence of stress, that is to say in the absence of content in the container 1), which is extends in the extension of the cheek 11 to a central zone 14 of the bottom 6, circumscribed in a circle with a diameter d.
• a concave arch 13 concavity facing the outside of the container 1 in the absence of stress, that is to say in the absence of content in the container 1
• the vault 13 is shallow, and its curvature slightly pronounced.
• the maximum angle A1 of its tangent with a plane perpendicular to the axis of the container 1 (measured in this case on an outer edge of the vault 13) is weak, less than or equal to about 20 °.
• the bottom 6 comprises, in the extension of the vault 13, a central pin 15 which extends axially projecting towards the inside of the container 1.
• the roof 13 is also provided with a series of stiffeners 16 in the form of projecting branches which extend radially from the central zone 14 of the bottom 6 to the cheek 11, and which together form a star pattern.
• the stiffeners 16 are connected to the central zone 14 of the bottom 6. By an outer radial end 18, the stiffeners 16 are connected to the flange 11. In all the illustrated embodiments, the stiffeners 16 are there are 8, but this number is provided as an example and could be different. More precisely, this number can be between 4 and 12; for purposes of mechanical strength, it is preferably between 6 and 10. Similarly, the height, width and shape of the stiffeners 16 may vary depending on the application. By way of example, as will be seen below, the stiffeners may be Y-shaped arcuate pointing towards the center or the periphery of the bottom, or straight, or in the form of X.
• the ratio d / D is preferably less than 1/2, at failing which the central zone 14 is not sufficiently rigid and may present a risk of overturning under the effect of the hydrostatic pressure of the contents of the container 1.
• the vault 13 defines panels 19 recessed whose profile is complementary to that of the stiffeners 16.
• Each stiffener 16 has a concave bottom face 20 which extends in the extension of the surface of the central zone 14, and two lateral edges 21 which form fillets 22, 23 for connecting the lower face with the panels 19 recessed.
• the edges 21 are of double radius, and comprise a first fillet 22 with a profile. convex, which is flush with the lower face, followed by a second leave 23 concave profile, which is flush with the panel 19.
• the vault 13 is not connected to the cheek 11 directly, but by an intermediate junction face of generally frustoconical shape of revolution about the axis X of the container 1.
• the container 1 can be manufactured by stretch blow molding from a plastic preform such as PET.
• a plastic preform such as PET.
• the stiffeners 16 are Y-shaped and tapering from their inner ends to their outer ends. As clearly shown in Figure 3, the opposite side edges 21 of the same stiffener 16 are not contiguous to the outer end 18 thereof, but leave a strip 24 of the lower face 20 of the stiffener 16 until on the cheek 11.
• the internal ends 17 of the stiffeners 16 are spaced apart from the central pin 15, so that the central zone 14 forms between the pin 15 and the internal ends 17, in the extension of the faces 20, a ring of matter encircling the pawn 15.
• the central zone 14 has a relatively large diameter D, the ratio d / D between the diameter d of the central zone 14 and the diameter D of the central zone 14. plays 11 being close to 0.5. It is therefore necessary to give the bottom 6 additional rigidity.
• this extra rigidity is assigned to the periphery of the bottom 6, by the particular geometry of the face 25, which comprises: - a frustoconical facet 26 extending in the extension of the cheek 11 and the opening angular A2, measured with respect to a plane perpendicular to the axis X of the container 1 (or, in others terms, with the laying plane 8), is of a value (of approximately 45 °, as illustrated in FIG. 7) greater than or equal to that of the angle A1 that forms with this same plane the tangent to the vault 13 on its outer peripheral edge;
• annular reinforcing lip 28 which, surrounding the bottom 6, joins the outer ends 18 of the stiffeners 16 in pairs.
• the lip 28 has in section a V-shaped profile (FIG. 7), which protrudes by pointing substantially in the direction of the X axis.
• the lip 28 has a local enlargement 29 at its junction with the external end 18 of each stiffener 16.
• the lip 28 has two flanks 30, 31, namely an outer flank 30, on the side of the facet 26, and an inner flank 31 on the side of the fillet 27 connecting with the vault 13.
• the outer flank 30 has in section a straight profile, and forms with a plane perpendicular to the axis (in other words with the laying plane 8) an angle A3 low, less than or equal to 20 °. In the illustrated example, this angle A3 is about 10 °.
• the inner flank 31 also has a straight profile, and forms with the outer flank an open angle (greater than 90 °), such that the bisector of this angle forms with the facet a right or substantially right angle.
• the annular lip 28 of reinforcement also contributes to the stiffening of the seat 7. On the one hand, it reduces the risk of crushing of the seat 7 in the gap between two stiffeners 16, under the effect of stresses tending 6. On the other hand, at its junction with the outer ends of the stiffeners 16, it contributes to the rigidity of the connection between the stiffeners 16 and the seat 7, in particular reducing the risk of torsion. stiffeners 16.
• the fillet 12 has a small radius of curvature - less than or equal to about 1 mm.
• stiffeners 16 have a V-shaped profile, and tapering from their inner end 17 to their outer end 18.
• the central zone 14 is almost reduced to the pin 15, only a thin ring of material separating the inner ends 17 of the stiffeners 16 of the pin 15.
• the ratio d / D between the diameter d of the central zone 14 and the diameter D of the cheek 11 is relatively low, less than 1/3, and the rigidity of the bottom 6 is therefore relatively large. This is why the face 25 is devoid of annular reinforcing lip.
• the junction face is smooth, and is limited to a cone frustum whose angular aperture A2, measured with respect to a plane perpendicular to the X axis of the container 1 ( or, in other words, with the laying plane), is of a value of about 45 °.
• connection fillets 32 are provided at the outer ends 18 of the stiffeners, at their junction with the face 25 and their junction with the cheek 11. .
• the fillet 12 has a small radius of curvature - less than or equal to about 1 mm.
• a third embodiment is illustrated in Figures 11, 12 and 13.
• the stiffeners 16 have a straight profile in I, and have a substantially constant width over approximately their entire length.
• the central zone 14 is reduced to the pin 15, which on its periphery delimits the inner ends 17 of the stiffeners 16.
• the pin 15 has a star-shaped profile, the internal ends 17 of the stiffeners 16 being thinned while being beveled.
• the diameter d of the central zone 14 (coincides with the diameter of the pin 15) is such that the ratio d / D is about 1/4, and the rigidity of the bottom 6 is quite high.
• the face 25 is devoid of annular reinforcing lip.
• the junction face is smooth, and is limited to a cone frustum whose angular aperture A2, measured with respect to a plane perpendicular to the axis X of the container 1 ( or, in other words, with the laying plane), is of a value of about 45 °.
• connection fillets 32 are provided at the outer ends 18 of the stiffeners, at their junction with the face 25 and their junction with the cheek 11. .
• the fillet 12 has a small radius of curvature - less than or equal to about 1 mm.
• a fourth embodiment is illustrated in Figures 14, 15 and 16.
• the stiffeners 16 have an inverted Y profile, and have, for about half of their length, an I-shaped straight internal portion 33 of substantially constant width, which is extended by an outer portion 34 V inverted, which is widening from the inner portion 33 to the outer end 18.
• the central zone 14 is reduced to the pin 15, which on its periphery delimits the inner ends 17 of the stiffeners 16.
• the pin 15 has a star-shaped profile, the internal ends 17 of the stiffeners 16 being thinned while being beveled.
• the diameter d of the central zone 14 (coincides with the diameter of the pin 15) is such that the ratio d / D is about 1/4, and the rigidity of the bottom 6 is quite high. This is why the face 25 is devoid of annular reinforcing lip.
• the junction face is smooth, and is limited to a truncated cone whose angular aperture A2, measured with respect to a plane perpendicular to the axis X of the container 1 ( or, in other words, with the laying plane), is of a value of about 45 °.
• connection fillets are provided at the outer ends 18 of the stiffeners, at their junction with the face 25 and their junction with the cheek 11.
• the fillet 12 has a small radius of curvature - less than or equal to about 1 mm.
• a fifth embodiment is illustrated in Figures 17, 18 and 19.
• the stiffeners 16 have an inverted Y profile, and have, for about half of their length, a straight internal portion 33 of I, of substantially constant width, which is extended by an outer portion 34
• V inverted which is widening from the inner portion 33 to the outer end 18.
• the central zone 14 is reduced to the pin 15, which on its periphery delimits the inner ends 17 of the stiffeners 16.
• the pin 15 has a star-shaped profile, the internal ends 17 of the stiffeners 16 being thinned while being beveled.
• the diameter d of the central zone 14 (coincides with the diameter of the pin 15) is such that the ratio d / D is about 1/4, and the rigidity of the bottom 6 is quite high. This is why the face 25 is devoid of annular reinforcing lip.
• the junction face is smooth, and is limited to a truncated cone whose angular aperture A2, measured with respect to a plane perpendicular to the X axis of the container 1 ( or, in other words, with the laying plane), is of a value of about 45 °.
• connection fillets 32 are provided at the outer ends 18 of the stiffeners, at their junction with the face 25 and their junction with the cheek 11. .
• the fillet 12 has an average radius of curvature of between 1 mm and 5 mm. In the illustrated example, the fillet 12 has a radius of curvature of approximately 2 mm and extends to the junction face 25. with the vault 13 (figure 19), we see that it is an internal portion of the leave
• a sixth embodiment is illustrated in Figures 20 and 21.
• the stiffeners 16 have an inverted Y profile, and have, for about half of their length, an I-shaped straight internal portion 33 of substantially constant width, which is extended by an outer portion 34 V inverted, which is widening from the inner portion 33 to the outer end 18.
• the central zone 14 is reduced to the pin 15, which on its periphery delimits the inner ends 17 of the stiffeners 16.
• the pin 15 has a star-shaped profile, the internal ends 17 of the stiffeners 16 being thinned while being beveled.
• the diameter d of the central zone 14 (coincides with the diameter of the pin 15) is such that the ratio d / D is about 1/4, and the rigidity of the bottom 6 is quite high.
• the face 25 is devoid of annular reinforcement lip and is limited to a truncated cone whose angular aperture A2, measured with respect to a plane perpendicular to the axis X of the container 1 (or, in other words, other words, with the laying plane), is of a value of about 45 °.
• connection fillets 32 are provided at the outer ends 18 of the stiffeners, at their junction with the face 25, and at their junction with the cheek. 11.
• the fillet 12 has a small radius of curvature - less than or equal to about 1 mm.
• the seat 7 is hollowed out with arcuate notches located angularly in each zone situated between the outer ends 18 of two adjacent stiffeners 16.
• the laying plane 8 is discontinuous and is segmented into a peripheral series of coplanar facets 36 located in the extension of each stiffener 16, and separated in pairs by a notch 35.
• This configuration has the advantage of improving the blowing and better control the forming of the container 1, because in the seat 7 the material tends, when taking the footprint of the bottom 6, to widen naturally between the stiffeners 16 due to the local freezing of the material at the moment when it reaches the fingerprints of the stiffeners 16, which occurs before the formation of the seat 7.
• a seventh embodiment is illustrated in Figures 22, 23 and 24.
• the stiffeners 16 have an inverted Y profile, and have, for about half of their length, a straight internal portion 33 of I, of substantially constant width, which is extended by an outer portion 34 V inverted, which is widening from the inner portion 33 to the outer end 18.
• the central zone 14 is reduced to the pin 15, which on its periphery delimits the inner ends 17 of the stiffeners 16.
• the pin 15 has a star-shaped profile, the internal ends 17 of the stiffeners 16 being thinned while being beveled.
• the diameter d of the central zone 14 (coincides with the diameter of the pin 15) is such that the ratio d / D is about 1/4, and the rigidity of the bottom 6 is quite high.
• the face 25 is devoid of annular reinforcement lip and is limited to a truncated cone whose angular aperture A2, measured with respect to a plane perpendicular to the axis X of the container 1 (or, in other words, other words, with the laying plane), is of a value of about 45 °.
• connection fillets 32 are provided at the outer ends 18 of the stiffeners, at their junction with the face 25 and their junction with the cheek 11. .
• the fillet 12 has a small radius of curvature - less than or equal to about 1 mm.
• the seat 7 is reinforced by means of a peripheral series of curves 37 each formed of radial projection inwards, on the cheek 11, between the outer ends 18 of two adjacent stiffeners 16.
• FIG. 22 shows that the curves 37, which are convex in the direction of the axis X of the container 1, locally reverse the curvature of the cheek 11.
• the curves 37 widen locally. the seat, whose width L is therefore variable between a minimum value L min (at the level of the stiffeners, FIG. 23) and a maximum value L max (in a median radial plane of the curves 37, coinciding with the section plane XXIV xxiv).
• This configuration has the advantage of reinforcing the rigidity of the bottom 6, while improving the blowing ability and by better controlling the forming of the container 1, because in the seat 7 the material tends, during the impression taking of the bottom 6, to be stretched naturally between the stiffeners 16, due to the local freezing of the material at the moment when it reaches the fingerprints of the stiffeners 16, which occurs before the formation of the seat 7.
• the bottom structure 6 has equal weight with mechanical performance higher than that of the known funds.
• the wide seat 7, whose diameter of the laying plane 8 is substantially equal to that of the body 5 in the vicinity of the bottom 6, combined with the small radius of the outer leave 10, provides the container 1 a better stability than a conventional seat of which the diameter of the laying plane is substantially smaller than the diameter of the body, and whose high radius fillet favors the rolling of the bottom.
• the stiffeners 16 in the form of branches do not only contribute to stiffening the vault 13 to reduce the risk of deformation thereof, the extreme deformation being the inversion of the vault.
• the stiffeners 16 act in the manner of struts, providing a radial recovery of the axial forces exerted on the roof 13 by the hydrostatic pressure of the contents of the container 1.
• the stiffeners 16 bearing against the cheek 11 at their ends, the radial recovery efforts results in permanent centrifugal radial stress exerted by the stiffeners 16 on the seat 7 via the cheek 11, which helps to stiffen the seat 7, particularly preventing ovalization.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Ceramic Engineering (AREA)
• Containers Having Bodies Formed In One Piece (AREA)

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Cited By (1)

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• 2010
  • 2010-06-11 FR FR1002485A patent/FR2961180B1/fr not_active Expired - Fee Related
• 2011
  • 2011-06-14 CN CN201180035807.3A patent/CN103025614B/zh not_active Expired - Fee Related
  • 2011-06-14 BR BR112012033137A patent/BR112012033137A2/pt not_active Application Discontinuation
  • 2011-06-14 MX MX2012014198A patent/MX339711B/es active IP Right Grant
  • 2011-06-14 WO PCT/FR2011/051337 patent/WO2011154670A1/fr not_active Ceased
  • 2011-06-14 EP EP11735484.5A patent/EP2580132B1/de not_active Not-in-force
  • 2011-06-14 US US13/703,193 patent/US10065766B2/en not_active Expired - Fee Related

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