USOO8524349B2
`
`(12) United States Patent
`Protais et al.
`
`(10) Patent No.:
`(45) Date of Patent:
`
`US 8,524,349 B2
`Sep. 3, 2013
`
`(54) BOTTOM OF HOLLOW WARE OBTAINED BY
`THE BLOW MOULDING OR
`STRETCH-BLOW MOULDING OFA
`THERMOPLASTIC HOLLOW WAIRE
`PREFORMI HAVING SUCH ABOTTOM
`
`(58) Field of Classification Search
`USPC ................. 428/66.3; 215/373, 375; 220/608
`See application file for complete search history.
`
`(56)
`
`References Cited
`
`(75) Inventors: Pierrick Protais, Octeville sur Mer
`(FR); Michel Boukobza, Octeville sur
`Mer (FR)
`(73) Assignee: Sidel Participations, Octeville sur Mer
`(FR)
`Subject to any disclaimer, the term of this
`patent is extended or adjusted under 35
`U.S.C. 154(b) by 635 days.
`12/376,412
`
`(21) Appl. No.:
`
`(*) Notice:
`
`Jul. 13, 2007
`PCT/FR2007/001208
`
`(22) PCT Filed:
`(86). PCT No.:
`S371 (c)(1),
`Aug. 4, 2010
`(2), (4) Date:
`(87) PCT Pub. No.: WO2008/017747
`PCT Pub. Date: Feb. 14, 2008
`
`(65)
`
`(30)
`
`Prior Publication Data
`US 2010/0297375 A1
`Nov. 25, 2010
`
`Foreign Application Priority Data
`
`Aug. 8, 2006 (FR) ...................................... O6 O7213
`
`(51) Int. Cl.
`B65D L/42
`(52) U.S. Cl.
`USPC ........... 428/66.3; 215/373; 215/375; 220/608
`
`(2006.01)
`
`
`
`U.S. PATENT DOCUMENTS
`5,549,210 A
`8/1996 Cheng
`2004/00945O2 A1* 5/2004 Boukobza ..................... 215,375
`
`FOREIGN PATENT DOCUMENTS
`2 822 804 A1 10, 2002
`FR
`* cited by examiner
`Primary Examiner — Alexander Thomas
`(74) Attorney, Agent, or Firm — Sughrue Mion, PLLC
`
`ABSTRACT
`(57)
`Bottom of hollow ware obtained by the blow molding or
`stretch-blow molding of a thermoplastic preform, this bottom
`having a transverse bearing Surface and, on either side of this
`transverse bearing Surface, a transverse external edge (7) and
`a concave internal wall with a transverse central portion (11)
`containing a disc (12) of material having a low crystallinity,
`this bottom including reinforcing ribs (1) having an outer
`edge (13) coming close to the transverse external edge (7) but
`without reaching this transverse external edge (7), these rein
`forcing ribs (1) hang an inner edge (14) coming close to the
`transverse central portion (11), but without reaching this
`transverse central portion (11), the transverse bearing Surface
`being formed from segments (6a, 6b, 6c. 6d. 6e) interrupted
`by the reinforcing ribs (1), this hollow ware bottom (4) further
`including notches (2), the distal end portion (24) of which
`comes close to but does not reach the external edge (7) of the
`bottom, the proximal end portion (25) of the notches (2) being
`tangential with the transverse bearing Surface but not opening
`into this transverse bearing Surface.
`17 Claims, 2 Drawing Sheets
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`U.S. Patent
`U.S. Patent
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`Sep. 3, 2013
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`Sheet 2 of 2
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`1.
`BOTTOM OF HOLLOW WARE OBTANED BY
`THE BLOW MOULDING OR
`STRETCH-BLOW MOULDING OFA
`THERMOPLASTIC HOLLOW WAIRE
`PREFORMI HAVING SUCH ABOTTOM
`
`The invention relates to the technical field of hollow bodies
`made of thermoplastic material, particularly containers such
`as jars or bottles.
`More particularly, the invention relates to hollow bodies
`obtained by blowing or stretching then blowing an injected
`preform made of thermoplastic material (injection-blowing).
`For several years the manufacture of containers of plastic
`material from previously injected preforms has experienced
`considerable expansion, particularly due to the use of poly
`ethylene terephtalate (PET).
`Meanwhile, other materials have been considered and/or
`used with more or less Success. Non-limiting examples of
`such materials are polyethylene naphtalate (PEN), polypro
`pylene (PP), polyacrylonitrile (PAN) or mixtures or overlays
`of various materials.
`It is known that blowing or stretch-blowing causes a struc
`tural hardening of PET. Blowing or stretch-blowing also
`causes a crystallization induced by deformation, leaving the
`material translucent. For conventional deformation speeds,
`the crystallinity increases as the speed of deformation
`increases and the rate of deformation increases.
`Conventionally, however, there remains at the center of the
`bottom of the hollow body, a Zone of very low crystallinity
`called “disc resulting from part of the preform that is only
`very weakly stretched during the blowing or stretch-blowing.
`Indeed, the longitudinal axis of the preform corresponds to
`that of the final container. This results in the fact that during
`the blowing or stretch-blowing, the stretching of the PET is
`nearly Zero at the center of the bottom of the container, and
`increases as the side wall of the container is approached.
`When conventional bi-oriented PET containers are taken to
`a temperature higher than the glass transition temperature,
`they undergo significant shrinkage due to release of stresses.
`To compensate for this problem, it has long been known to
`perform a heat treatment called “heat setting a treatment in
`which, just after the blowing of the preform and while the
`container is still in contact with the walls of the blow mold, a
`temperature between about 120° C. and 250° C. is applied to
`the material for several seconds. The container is then cooled
`while being kept under pressure.
`Irrespective of their manufacturing process, the bottom of
`containers made of thermoplastic material must have good
`strength.
`Bi-oriented PET has good mechanical strength and thermal
`resistance. However, as was mentioned above, the bottom of
`the containers is much less stretched than the body of the
`containers, so the mechanical strength and thermal resistance
`of the bottom is less than that of the body.
`The same problem exists for the neck. The heat treatment
`of the necks makes it possible to increase their crystallinity.
`But the heat treatment of necks (in amorphous PET) leads to
`an isothermal crystallization forming spherolites, so the
`resulting hardened thermo PET is no longer translucent. Even
`though it may be acceptable for the necks of bottles, relatively
`thick, not to be translucent, a bottle bottom that is not very
`translucent would spoil the presentation of the product con
`tained therein.
`The bottom of the container must be impact-resistant, for
`example when the container is dropped.
`The container bottom must withstand internal pressure,
`particularly when the container contains a carbonated bever
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`age. Excess internal pressure can result from an increase in
`the storage temperature of the full bottles and/or from the
`shrinkage of the plastic material of these bottles, said shrink
`age generally occurring over the course of two or three weeks
`following their manufacture and filling.
`The bottles are transported palletized and stacked. Thus,
`unless separator materials are used, the bottoms of the bottles
`of the upper layers rest on the caps of the lower bottles and are
`Subject to compressing and crushing stresses.
`The container bottom must withstand internal drops in
`pressure that can occur, particularly after the container has
`been hot-filled, then sealed before its contents have cooled.
`Any deformation of the bottom of the container affects the
`aesthetics of the product and the stability of the container
`when stored upright.
`The container bottom must be resistant to creep.
`The container in its entirety, and in particular its bottom,
`must be resistant to the relatively severe heat conditions
`encountered during hot-filling or pasteurization.
`During hot-filling with a liquidata temperature of 94° C. at
`most, the bottom must have a relative deformability. This is
`also true during the Subsequent cooling, since the bottom
`must withstand the drop in pressure (vacuum compensation).
`Pasteurization is carried out for Some non-gaseous (non
`carbonated fruit juices) or gaseous (beer) liquids. During
`pasteurization, the liquid contained in the closed container
`can be taken to a temperature, for example, of between about
`60° C. and 80°C. for 20 minutes to 2 hours, the temperature
`depending on the CO content. When the liquid to be pasteur
`ized contains gas dissolved under pressure (carbonated bev
`erage, beer), the material of the bottom of the container must
`withstand not only the increased volume of the hot liquid, but
`also the increased pressure from the hot gas. During cooling,
`since the pasteurized liquid reduces in Volume, the bottom of
`the container must also withstand this stress.
`Some containers have a bottom that is subject to sagging
`during hot-filling. This outward sagging of the bottom, espe
`cially in the Zone of junction between the side wall of the
`container and the bottom, does not occur regularly around the
`circumference of the container. Consequently the container
`becomes unstable. This sagging can be caused by a release of
`stresses induced during the final blowing of the hot shrunk
`preform.
`Any deformation of the bottom of the container affects the
`aesthetics of the product and the stability of the container
`stored upright.
`The bottom of containers must sometimes withstand clean
`ing agents, in the case of reusable containers.
`In order to compensate for all or part of the problems that
`can occur, it has been proposed to produce containers with
`petaloid bottoms. The bottom wall is then generally out
`wardly convex in shape and includes legs, typically four to six
`legs formed by protuberances regularly distributed on the
`bottom and separated two by two by a portion of the convex
`bottom wall. These petaloid bottoms are widely used for
`containers containing carbonated beverages. The radial
`recesses separating the legs absorb the stresses due to pres
`Surization during filling and maintain the Support spans of the
`legs in a plane Substantially perpendicular to the axis of the
`container. This solution is not always satisfactory. Under the
`effect of internal pressure, petaloid bottoms can burst. Peta
`loid bottoms cannot always withstand the excess pressure due
`to the increased volume of the contents of the bottle during
`pasteurization.
`Bottoms have also been considered such as the one
`described in the applicants document FR 2 822 804. It
`describes a bottle bottom comprising in its central part a
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`multiple-branch cross-shaped impression, said bottom fur
`ther being of the petaloid type, each leg being provided with
`a stress absorption notch, radially separated from the end of
`the respective branch of the cross-shaped impression. The
`implementation of said stress absorption notches allows the
`localization, at the notch, of the deformation that may result
`when a leg undergoes stress. The implementation of these
`notches further results in two support Zones on either side of
`each notch, said notches being partly placed in the base Zone
`of the bottle.
`As it happens, although the bottoms from the prior art
`resolve only some of the problems mentioned, none is
`capable of recovering its initial shape after being dropped and
`subsequent deformation, whether it is full or not. The inven
`tion seeks to provide a new bottle bottom structure, wherein
`all of the individual characteristics make it possible to obtain
`a strength that exceeds that of most currently known bottoms,
`and allows it to recover its shape after deformation.
`For an identical wall thickness, a bottom according to the
`invention will be stronger than most previously known bottle
`bottoms. In particular, it will have a better strength under
`WaCUU.
`For a desired strength, a bottom according to the invention
`can be produced with less material than most previously
`known bottoms.
`The invention also seeks to provide a bottle having good
`strength for hot-filling and good strength for pasteurization,
`while considering a possible significant lightening of the
`container as a whole compared to known structures. An over
`all lightening of the container by 5% to 20% is thus consid
`ered.
`According to a first aspect, the invention relates to a bottom
`of a hollow body obtained by blowing or stretch-blowing of a
`preform of thermoplastic material, said bottom comprising a
`transverse Support Surface, and on either side of said trans
`verse Support Surface:
`a transverse outer edge;
`a concave inner wall with a transverse central part contain
`ing a disc of material of low crystallinity, said disc cor
`responding to the injection point of the preform;
`said bottom comprising reinforcing ribs having an outer edge
`in proximity to the transverse outer edge but without reaching
`said transverse outer edge, said reinforcing ribs having an
`inner edge in proximity to the transverse central part but
`without reaching said transverse central part,
`the transverse Support Surface being formed from segments
`interrupted by the reinforcing ribs,
`said bottom of a hollow body further comprising notches the
`distal end portion of which is adjacent to but does not reach
`the outer edge of the bottom, the proximal end portion of the
`notches being tangent to the transverse Support Surface but
`not opening into said transverse Support Surface.
`In various embodiments, the bottom has the following
`characteristics, combined as needed:
`the concave inner wall is provided with reinforcing grooves
`the distal end portion of which is in proximity to one
`segment of the transverse Support Surface but without
`reaching said segment, the proximal end portion of said
`reinforcing grooves being in proximity to the transverse
`central part but without reaching said transverse central
`part;
`the reinforcing grooves comprise a bottom wall and two
`lateral flanges and have a plane of symmetry;
`the notches comprise a bottom wall and two lateral flanges
`and have a plane of symmetry;
`the bottom wall of a reinforcing groove is substantially
`placed in alignment with the bottom wall of a notch and
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`the proximal end portion of each reinforcing groove
`extends between two reinforcing ribs;
`the width of the notches is between about 2 and 20 milli
`meters;
`the depth of said notches is between about 1 and 5 milli
`meters;
`the disc of material of low crystallinity projects in the outer
`face into the transverse central part;
`In one advantageous embodiment, except for the reinforc
`ing ribs and the reinforcing notches and grooves, the bottom
`is in the form of a body of revolution around an axis substan
`tially perpendicular to its transverse Support Surface.
`In one particular embodiment, in Vertical radial cross-sec
`tion between the outer edge and the transverse Support Sur
`face, the hollow body bottom has a profile that is:
`adjacent to the outer edge, Substantially tangent to a direc
`tion perpendicular to the transverse Support Surface,
`adjacent to the transverse Support Surface, Substantially
`tangent to said transverse Support Surface.
`Advantageously, in Vertical radial cross-section between
`the outer edge and the transverse Support Surface, the bottom
`has a Substantially parabolic profile.
`According to a second aspect, the invention relates to hol
`low bodies of thermoplastic material, especially a polyester
`such as PET, obtained by blowing or stretch-blowing of a
`preform, said hollow bodies comprising a side wall and a
`bottom joined to said side wall, said bottom being as pre
`sented above.
`Other objects and advantages of the invention will become
`apparent from the following description of embodiments,
`provided by way of non-limiting examples, said description
`being made with reference to the appended drawings in
`which:
`FIG. 1 is a bottom view of a bottom of a hollow body such
`as a bottle, for example, according to one embodiment of the
`invention;
`FIG. 2 is a side view of the bottom represented in FIG. 1;
`FIG.3 is a view in perspective of the bottom represented in
`FIGS. 1 and 2.
`Except for five radial ribs 1, five reinforcing notches 2 and
`five reinforcing grooves 3, the bottom 4 is in the form of a
`body of revolution around an axis 5 substantially perpendicu
`lar to its transverse Support Surface 6.
`For this reason and for purposes of simplification, the bot
`tom 4 will first be described while disregarding the radial ribs
`1, reinforcing notches 2 and reinforcing grooves 3, which will
`be described in detail subsequently.
`The bottom 4 will be described by starting from its outer
`edge 7 and proceeding radially toward the axis of revolution
`5.
`The outer edge 7 is transverse and corresponds Substan
`tially to the junction between the bottom 4 and the side wall of
`the container (not shown). Said outer edge 7 is placed at a
`height h7 with respect to the transverse support surface 6 of
`the bottom 4 (and of the bottle comprising said bottom 4,
`when said bottle is stored upright).
`Between the outer edge 7 and the transverse support sur
`face 6, the bottom 4 has in vertical radial cross-section a
`substantially parabolic profile 8. Adjacent to the outer edge 7.
`said profile 8 is substantially tangent to a direction 9 perpen
`dicular to the transverse Support Surface 6. Adjacent to the
`transverse support surface 6, said profile 8 is substantially
`tangent to said transverse support surface 6. The profile 8thus
`provides a solution for continuity with unbroken curvature
`between the side wall of the container (not shown) and the
`transverse Support Surface 6.
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`The bottom 4 has an annular, segmented transverse Support
`Surface 6, as will appear Subsequently. Starting from this
`transverse Support Surface 6 and proceeding towards the axis
`of revolution 5, the bottom 4 has, in vertical radial cross
`section, a profile 10 that is substantially parabolic, then a
`transverse central part 11.
`The transverse central part 11 is placed at a heighth 11 with
`respect to the transverse Support Surface 6, while said height
`h11 can be higher or lower than the height h7 of the outer edge
`7.
`An axial disc 12 projects in the transverse central part 11,
`said axial disc 12 projecting downward, that is, out of the
`container provided with the bottom 4.
`The radial reinforcing ribs 1 will now be described.
`Said radial ribs 1 have an outer edge 13 in proximity to the
`outer edge 7 of the bottom 4, but without reaching said outer
`edge 7. A distance of several millimeters thus separates the
`outer edge 13 (of the ribs 1) and the outer edge 7 (of the
`bottom 4).
`Said radial ribs 1 have an inner edge 14 in proximity to the
`transverse central part 11, but without reaching said trans
`verse central part 11.
`Each radial rib 1 comprises a bottom wall 15 and a flange
`16, 17 on either side of said bottom wall 15. The bottom wall
`15 decreases in width from the outer edge 13 to the inner edge
`14 of the rib 1. As shown in the figures, the bottom wall 15 of
`a rib has a substantially constant curvature over the whole
`radial length of said rib.
`Each radial rib 1 has a plane of symmetry 18 that is vertical
`and radial.
`The radial ribs 1 rest against a central chimney 19 at the
`center of which the disc 12 protrudes downward, said central
`chimney 19 being limited at the top by the transverse central
`part 11.
`The notches 2 will now be described.
`Said notches 2 extend radially. They comprise a bottom
`wall 20 and two lateral flanges 21, 22. Each notch 2 has a
`radial vertical plane of symmetry 23. The distal end portion
`24 of these notches 2 is adjacent to but does not reach the outer
`edge 7 of the bottom 4. Said notches 2 thus have a nearly
`vertical exit but at a distance from the mating surface. The
`distal end portion 24 of the notches is placed at a height h24
`with respect to the transverse support surface 6. In the
`embodiment represented, said height h24 is Substantially
`equal to one half of the height h7. The distance between the
`edge 7 and the distal end portion 24 of the notches is thus
`much greater than the distance between the edge 7 and the
`outer edge 13 of the reinforcing ribs 1.
`The proximal end portion 25 of the notches 2 is tangent to
`the base but without opening into said base. The width of the
`notches is typically between 2 and 20 millimeters. The depth
`of said notches 2 varies according to the capacity of the bottle,
`and is typically equal to 1.5 millimeters for a 0.5-liter bottle (3
`to 4 millimeters for a 1.5-liter bottle). The depth of the
`notches 2 is less than the depth of the radial ribs 1, as can be
`seen in particular in FIG. 3.
`The notches 2 participate in the overall strength of the
`bottom 4 and especially provide a mechanical reinforcement
`of the part of the bottom located beyond the base and that is
`delimited by two adjacent ribs 1.
`The reinforcing grooves 3 will now be described.
`Said reinforcing grooves 3 extend radially. They comprise
`a bottom wall 26 and two lateral flanges 27, 28. Each rein
`forcing groove 3 has a radial vertical plane of symmetry 29.
`The distal end portion 30 of said reinforcing grooves 3 is
`adjacent to but does not reach the transverse Support Surface
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`6. The proximal end portion 31 of the reinforcing grooves 3
`rests against the chimney 19 without reaching the transverse
`central part 11.
`In the embodiment represented, the bottom wall 26 of each
`reinforcing groove 3 extends radially in alignment with the
`bottom wall 20 of a notch 2. In other words, the plane of
`symmetry 23 of each notch 2 is substantially merged with a
`plane of symmetry 29 of a reinforcing groove 3.
`The transverse support surface 6 is thus formed from five
`annular sectors 6a, 6b, 6c. 6d. 6e, each of said annular sectors
`6a, 6b, 6c. 6d. 6e adjoining:
`an proximal end portion 25 of a notch 2, said proximal end
`portion 25 not encroaching upon the base annular sector;
`an distal end portion 30 of a reinforcing groove 3, said
`distal end portion 30 also not encroaching upon the base
`annular sector;
`a flange 16, 17 of a radial rib 1, said radial ribs 1 separating
`the transverse base into its different annular sectors.
`All of the individual characteristics of the bottle bottom
`make it possible to obtain a strength that is greater than that of
`most currently known bottoms. For an identical wall thick
`ness, a bottom according to the invention will be stronger than
`most previously known bottle bottoms. For a desired strength,
`a bottom according to the invention can be produced with a
`thickness of material that is less than most previously known
`bottoms.
`A bottle comprising a bottom according to the invention
`has good strength in hot-filling and good strength in pasteur
`ization. The central chimney 19 is particularly well reinforced
`with regard to creep or sag by the presence of the reinforcing
`ribs 1 and reinforcing grooves 3.
`A bottle comprising a bottom according to the invention
`also has good impact resistance on the lower part of the side
`wall. The presence of the notches 2 makes it possible to
`reduce the risk of plastic deformation of the bottle in the Zone
`where the side wall of a container is connected to its base.
`The shape of the bottle bottom allows the weight of mate
`rial to be reduced without making the base more fragile or
`reducing the base Surface area too much as compared to
`conventional bottle bottoms, while still preserving good
`strength in hot-filling (vacuum effects during cooling) and
`impacts. By way of example, a conventional 32 g-bottle for
`hot-filling can be produced with only 26 g of PET, using a
`bottom according to the invention.
`This bottom, which absorbs impacts very well, easily
`recovers its shape after accidental deformation.
`In the embodiment shown, there are five substantially iden
`tical and equidistant reinforcing ribs 1. In other embodiments,
`the reinforcing ribs are more or less numerous, especially in
`order to take into account the diameter of the bottom. The
`reinforcing ribs can be of different dimensions, a first series
`having a narrower bottom wall than the bottom wall of a
`second series of ribs.
`In the embodiment represented, there are five substantially
`identical and equidistant notches, ribs and grooves. The num
`ber of notches, ribs and grooves can be greater than five,
`particularly for bottoms of large hollow bodies. By this
`arrangement, the ribs and notches cooperate best for the rein
`forcing of the hollow body bottom.
`
`The invention claimed is:
`1. A bottom of a hollow body obtained by blowing or
`stretch-blowing of a preform of thermoplastic material, said
`bottom comprising a transverse Support Surface, and on either
`side of said transverse Support Surface:
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`a transverse outer edge (7);
`a concave inner wall with a transverse central part (11)
`containing a disc (12) of material of low crystallinity,
`said disc corresponding to the injection point of the
`preform;
`said bottom comprising reinforcing ribs (1) having an outer
`edge (13) in proximity to the transverse outer edge (7) but
`without reaching said transverse outer edge (7), said reinforc
`ing ribs (1) having an inner edge (14) in proximity to the
`transverse central part (11), but without reaching said trans- 10
`verse central part (11), wherein the transverse support surface
`is formed from annular sectors (6a, 6b, 6c. 6d. 6e) interrupted
`by the reinforcing ribs (1), said bottom of the hollow body (4)
`further comprising notches (2) the distal end portion (24) of is
`which is adjacent to but does not reach the outer edge (7) of
`the bottom, the proximal end portion (25) of the notches (2)
`being tangent to the transverse support annular sectors but not
`opening into said transverse annular sectors.
`2. The bottom of the hollow body as claimed in claim 1,
`characterized in that the concave inner wall is provided with
`reinforcing grooves (3) the distalend portion (30) of which is
`in proximity to a segment (6a, 6b, 6c. 6d. 6e) of the transverse
`Support surface (6) but without reaching said segment (6a, 6b,
`6c. 6d. 6e), the proximal end portion (31) of said reinforcing is
`grooves (3) being in proximity to the transverse central part
`(11) but without reaching said transverse central part (11).
`3. The bottom of the hollow body as claimed in claim 2,
`characterized in that the reinforcing grooves (3) comprise a
`bottom wall (26) and two lateral flanges (27, 28) and have a so
`plane of symmetry (29).
`4. The bottom of the hollow body as claimed in claim 3,
`characterized in that the notches (2) comprise a bottom wall
`(20) and two lateral flanges (21, 22) and have a plane of
`symmetry (23).
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`5. The bottom of the hollow body as claimed in claim 4,
`characterized in that the bottom wall (26) of a reinforcing
`groove (3) is substantially placed in alignment with the bot
`tom wall (20) of a notch (2), the proximal end portion (31) of
`each reinforcing groove (3) extending between two reinforc- a
`ing ribs (1).
`6. The bottom of the hollow body as claimed in claim 1,
`characterized in that the width of the notches (2) is between
`about 2 and 20 millimeters.
`7. The bottom of the hollow body as claimed in claim 1,
`characterized in that the depth of said notches (2) is between
`about 1 and 5 millimeters.
`8. The bottom of the hollow body as claimed in claim 1,
`characterized in that the disc (12) of material of low crystal
`linity projects in the outerface into the transverse central part
`(11).
`9. The bottom of the hollow body as claimed in claim 1,
`characterized in that the outer edge (7) is placed at a height
`(h7) with respect to the transverse support surface, the trans
`verse central part (11) being placed at a height (h11) with
`respect to the transverse support surface.
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`10. The bottom of the hollow body as claimed in claim 1,
`characterized in that with the exception of the reinforcing ribs
`(1) and reinforcing notches (2) and reinforcing grooves (3),
`the bottom (4) is in the form of a body of revolution aroundan
`axis (5) substantially perpendicular to its transverse support
`surface.
`11. The bottom of the hollow body as claimed in claim 10,
`characterized in that, in vertical radial cross-section, between
`the outer edge (7) and the transverse support surface, it has a
`profile that is:
`adjacent to the outer edge (7). Substantially tangent to a
`direction perpendicular to the transverse support sur
`face,
`adjacent to the transverse support surface, substantially
`tangent to said transverse support surface.
`12. The bottom of the hollow body as claimed in claim 11,
`characterized in that it has, in vertical radial cross-section,
`between the outer edge (7)and the transverse support surface,
`a substantially parabolic profile.
`13. A hollow body of thermoplastic material, obtained by
`blowing or stretch-blowing of a preform, said hollow body
`comprising a side wall and a bottom joined to said side wall,
`said bottom being as presented in claim 1.
`14. The hollow body of thermoplastic material as claimed
`in claim 13, wherein the thermoplastic material is polyester.
`15. The hollow body of thermoplastic material as claimed
`in claim 13, wherein the thermoplastic material is PET.
`16. A bottom of a hollow body obtained by blowing or
`stretch-blowing of a preform of thermoplastic material, the
`bottom comprising
`a concave inner wall with a transverse central part having a
`disc of material of low crystallinity, the disc correspond
`ing to the injection point of the preform:
`a transverse outer edge;
`reinforcing ribs having an outer edge in proximity to the
`transverse outer edge without reaching the transverse
`outer edge, the reinforcing ribs have an inner edge in
`proximity to the transverse central part without reaching
`the transverse central part;
`transverse support segments defining a substantially flat
`annular ring interrupted by the reinforcing ribs, the sup
`port segments provide a flat surface configured to sup
`port the hollow body;
`notches, the distal end portion of each adjacent to but not
`reaching the outer edge of the bottom, the proximal end
`portion of the notches being tangent to the transverse
`Support surface but not opening into the transverse sup
`port surface.
`17. The Bottom of hollow body according to claim 16,
`wherein the concave inner wall is provided with reinforcing
`grooves, the distal end portion of which is in proximity to a
`segment of the transverse support surface but without reach
`ing said segment, the proximal end portion of said reinforcing
`grooves being in proximity to the transverse central part but
`without reaching said transverse central part.
`
`EX-1008 PGR2024-00035
`
`