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
• • 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
• • 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
  • B65D2501/00—Containers having bodies formed in one piece
  • B65D2501/0009—Bottles or similar containers with necks or like restricted apertures designed for pouring contents
  • B65D2501/0018—Ribs
  • B65D2501/0036—Hollow circonferential ribs

Definitions

• the invention relates to the field of containers, such as bottles or pots, made of plastic material, obtained by blow molding or stretch blow molding from a blank (whether it is a preform or an intermediate container having has undergone pre-blowing operation of a preform), and comprising a body, which is extended at an upper end by a neck through which the filling and emptying of the container are made, and, at a lower end, by a closed bottom the recipient.
• blow molding and stretch blow molding operations performed in a mold in the impression of the container, give the material a certain rigidity, resulting from the double orientation that it undergoes, both axially (parallel to the axis). general mold - or container) and radially (perpendicular to the axis).
• Internal stresses include, for the most part, the temperature or pressure of the contents.
• thermofixation that is to say a thermal crystallization
• C for some drinks such as pasteurized fruit juice or tea
• heat setting because of its cost and its high cycle time, can not be generalized to more ordinary applications such as still water.
• petaloids comprising projecting feet, whose tops define a laying plane for the container, separated by deep valleys, which offer increased resistance to the high internal pressure. induced by certain contents (notably carbonated drinks).
• the petaloid bottoms because of the complexity of their shapes and the depth of their valleys (this depth generally represents at least 50% of the overall diameter from the bottom), however, require a relatively large amount of material, which makes them unsuitable for ordinary applications such as still water, for which on the contrary it is sought to minimize the amount of material used.
• the external stresses essentially comprise the axial compressive forces to which the palletized containers are subjected, each container carrying the weight of the column of containers above it. While thermofixed and / or petaloid-based containers generally withstand this type of constraint, thanks to their increased mechanical performance, the containers devolved to ordinary applications such as flat water are more difficult to withstand, and crushing phenomena are sometimes to deplore when palletizing this type of container.
• a first objective is to provide a container whose bottom has, in equal amount of material, improved mechanical performance, or identical performance with reduced material amount.
• a second objective is to provide a container whose bottom has an improved puffability.
• a third objective is to provide a container whose bottom gives it a better mechanical resistance to compression under axial compression.
• a plastic container comprising a body, which extends along a main axis, and a bottom which extends to a lower end of the body, the bottom being provided with projecting legs provided with vertices which extend in a common laying plane, the feet being separated in pairs by hollow grooves which extend radially from a central zone of the bottom, each foot having two flanks which each bordering a groove laterally, the flanks of two adjacent feet bordering the same groove forming between them, at the level of the laying plane and in a plane transverse to the radial direction of extension of the groove, an angle A at the obtuse apex.
• the angle A tends to open, which allows a slight axial compression of the bottom, resulting in an increase in the pressure of the contents of the container, and therefore a greater rigidity thereof.
• the angle A at the top between the flanks is between 90 ° and 150 °.
• the angle A at the apex between the flanks is approximately 120 °.
• each side has a concavity turned towards the outside of the container.
• each groove has a depth H, measured in line with the laying plane between the latter and the bottom of the groove, such that:
• D is an overall transverse dimension of the bottom, measured at its junction with the body.
• the depth of the throat is such that
• flanks bordering the same groove define, in a plane parallel to the laying plane, a maximum angular aperture B, measured on the axis of the body, greater than the angular aperture C defined by the apex of each foot, measured in the plane laying on the axis of the body.
• the bottom of the container has two concentric regions, namely a central region and a peripheral region, separated by a median axial recess which extends annularly so continuous, so that the central region is axially offset from the peripheral region towards the interior of the container;
• the grooves extend beyond the laying plane on an outer side wall of the bottom.
• Figure 1 is a realistic view from below, in perspective, of a plastic container
• Figure 2 is a realistic perspective view, on an enlarged scale, showing the bottom of the container of Figure 1; for a better understanding of the shapes of the bottom, we have left marks marking the curvature of the surfaces of this one;
• Figure 3 is a realistic bottom plan view of the container
• Figure 4 is a partial sectional view of the container of Figure 3, according to the sectional plane IV-IV;
• FIG. 5 is a side view showing the silhouette of the container, in solid lines, in the absence of stress, and in dotted lines under axial compressive stress, with, inset, a detail centered on a part of the bottom deformed by axial compression.
• a container 1 in this case a bottle, made by stretching blow from a thermoplastic preform, for example PET (polyethylene terephthalate).
• PET polyethylene terephthalate
• This container 1 is intended to accommodate a flat content (including flat water).
• 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 opposite the neck 2, from a lower end of the body 5.
• a D denotes an overall transverse dimension of the bottom 6, measured at its junction with the 5.
• the overall transverse dimension D of the bottom 6 corresponds to its overall diameter.
• the bottom 6 is provided with feet 7 formed by protuberances protruding outwardly of the container 1, and which extend from a central zone 8 of the bottom 6, which central zone 8 extends recessed towards the inside of the 1 and includes a pellet 9 after injection molding of the preform from which the container 1, and where the material remained substantially amorphous.
• Each foot 7 has an underside concavity-facing lower face 10 facing towards the outside of the container 1. As illustrated in FIG. 4, this lower face 10 extends radially in a gentle slope (less than or equal to about 10 ° with respect to a transverse plane perpendicular to the axis X of the container) from the central zone 8, to a top face 11, hereinafter referred to simply as a vertex, which forms the most protruding part of the foot 7.
• the vertices 11, which form the most protruding portion of the feet 7, extend in a common transverse plane 12, said laying plane, through which the container 1 can rest on a flat surface such as a table.
• the vertices 11 have, in the laying plane 12, a contour in fan, and are connected to an outer side wall 13 of the bottom by a fillet 14 large radius.
• C is the average angular aperture defined by the apex 11 of each foot 7, measured in the laying plane 12 and centered on the X axis ( Figure 3).
• the bottom 6 is provided with a series of recessed grooves 15 which extend radially from the central zone 8 and separate the feet 7 two by two.
• the bottom 6 comprises seven grooves 15 (and seven feet 7), but this number could be less (at least three) or greater (for example up to eleven grooves 15 and 7 feet). Due to the low height of the feet 7, the bottom 6 can not be considered as a petaloid bottom.
• each groove 15 has a depth H, measured in line with the laying plane 12 between it and the bottom of the groove 15, such that:
• H and D are in a report such that:
• the depth of the valleys in line with the laying plane is in a ratio of less than 1/5 with the overall transverse dimension of the bottom.
• each groove 15 has, in vertical section (in a plane parallel to the axis X and perpendicular to the radius along which the throat extends ), a profile in the form of an arch (in other words flared U), concavity turned towards the outside of the container 1.
• each leg 7 has two flanks 17 which each laterally border a groove 15, so that a groove 15 is bordered laterally by two flanks 17 respectively belonging to the two adjacent feet 7 flanking this groove. 15.
• FIGS. 2 and 3 grayed out, by a dot pattern, two sides 17 on either side of the same groove 15 (itself filled with a dotted pattern) .
• the flanks 17 bordering the same groove 15 form between them, at the level of the laying plane 12 and in a plane transverse to the radial direction of extension of the groove 15 and parallel to the X axis, an obtuse angle A at the apex.
• the angle A at the top between the flanks 17 bordering the same groove 15 is preferably between 90 ° and 150 °. According to a preferred embodiment, illustrated in the figures, the angle A is approximately 120 °.
• Each flank 17 is preferably concave, concavity turned towards the outside of the container 1.
• the radius of curvature of the flank 17 is much greater than that of the groove 15.
• the ratio between the radius of curvature of the groove 15 and that of the sidewall 17 is less than 1/10, and in particular of the order of 1/15.
• the flanks 17 thus form, on either side of the groove, an open secondary arch whose function will be highlighted below.
• Each flank 17 is connected, on the one hand, to the top 11 of the foot 7, on the other hand, to the groove 15, by leave of small radius.
• each sidewall 17 has, seen from below, a contour in the form of an arrow tail, which flares out from a point situated in the vicinity of the central zone 8. to an enlarged central portion to the right of the laying plane 12, then tapers from the central portion to a point located to the right of the outer side wall 13 of the bottom 6.
• flanks 17 bordering the same groove 15 define, in a plane parallel to the laying plane 12, a maximum angular aperture B (centered on the axis X and measured in the laying plane 12 between the outer edges of the central portions of the flanks 17).
• the angular aperture B is preferably greater than the angular aperture C defined by each apex 11.
• the angular aperture B is in a ratio with the angular aperture C defined by each vertex, such as:
• the bottom 6 of the container 1 can also be subdivided into two concentric regions, namely an annular central region 18 surrounding the central zone 8 of the bottom 6, and an annular peripheral region 19 surrounding the central region 18, separated by an annular recess 20 extending axially over a predetermined height.
• This recess 20 is substantially median with respect to the base 6, that is to say that the central region 18 and the peripheral region 19 have substantially the same radial extension.
• the recess 20 extends continuously, that is to say, it is not interrupted to the right of the grooves 15 but extends to the bottom thereof, or to the right of the feet 7, but straddles these, including on their lower faces and flanks 17.
• the recess 20 forms a ring with a circular contour.
• the central region 18 of the bottom 6 is slightly offset in height with respect to the peripheral region 19 towards the interior of the container 1.
• the recess 20 serves to maintain the stability of the container 1 by inducing a stiffening of the bottom 6 in its central region.
• the bottom 6 has good blowability (thanks in particular to the large angular opening A flanks 17), while giving the container 1 better mechanical performance than an ordinary container equivalent amount of material.
• This general deformation has the effect of pressurizing the contents of the container 1, and consequently to increase the rigidity of the container 1, in favor of its resistance to axial compression.
• the bottom 6, and more generally the container 1, thus behave as a compression spring whose stiffness increases with the compression force applied axially.
• the recess 20 makes it possible to limit the axial deformation of the bottom 6 by forming a piston which forms an end stop which, under the effect of a high axial compressive stress, joins the laying plane 12 and thus increases the contact surface of the container with its support.

Landscapes

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

Applications Claiming Priority (2)

Publications (2)

Family

ID=48979943

Family Applications (1)

Country Status (5)

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Family Cites Families (24)

• 2013
  • 2013-04-24 FR FR1353759A patent/FR3005035B1/fr active Active
• 2014
  • 2014-04-22 CN CN201480017338.6A patent/CN105050903B/zh not_active Expired - Fee Related
  • 2014-04-22 US US14/777,940 patent/US20160304233A1/en not_active Abandoned
  • 2014-04-22 WO PCT/FR2014/050980 patent/WO2014174210A1/fr active Application Filing
  • 2014-04-22 EP EP14727586.1A patent/EP2989015B1/de not_active Not-in-force

Non-Patent Citations (1)

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