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
  • B65D1/0284—Bottom construction having a discontinuous contact surface, e.g. discrete feet
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/48—Moulds
• • 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
  • B65D1/40—Details of walls
  • B65D1/42—Reinforcing or strengthening parts or members
  • B65D1/44—Corrugations
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/48—Moulds
  • B29C49/4823—Moulds with incorporated heating or cooling means
  • B29C2049/4838—Moulds with incorporated heating or cooling means for heating moulds or mould parts
  • B29C2049/4846—Moulds with incorporated heating or cooling means for heating moulds or mould parts in different areas of the mould at different temperatures, e.g. neck, shoulder or bottom
  • B29C2049/4848—Bottom
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/48—Moulds
  • B29C2049/4879—Moulds characterised by mould configurations
  • B29C2049/4892—Mould halves consisting of an independent main and bottom part
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
  • B29C49/06—Injection blow-moulding
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/48—Moulds
  • B29C49/4823—Moulds with incorporated heating or cooling means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/64—Heating or cooling preforms, parisons or blown articles
  • B29C49/6409—Thermal conditioning of preforms
  • B29C49/6418—Heating of preforms
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/64—Heating or cooling preforms, parisons or blown articles
  • B29C49/6409—Thermal conditioning of preforms
  • B29C49/6436—Thermal conditioning of preforms characterised by temperature differential
  • B29C49/6445—Thermal conditioning of preforms characterised by temperature differential through the preform length
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
  • B29K2067/003—PET, i.e. poylethylene terephthalate
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2031/00—Other particular articles
  • B29L2031/712—Containers; Packaging elements or accessories, Packages
  • B29L2031/7158—Bottles
• • 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 bottles made of thermoplastic material such as polyethylene terephthalate or PET manufactured by blow molding or stretch blow molding of a preform itself obtained by molding this thermoplastic material, for example by injection (ISBM technology: Injection Strech Blow Molding) .
• thermoplastic material such as polyethylene terephthalate or PET manufactured by blow molding or stretch blow molding of a preform itself obtained by molding this thermoplastic material, for example by injection (ISBM technology: Injection Strech Blow Molding) .
• bottles are intended in particular to contain drinks, for example water or other drinks.
• the bottles of the invention may in particular be intended to contain non-carbonated drinks, for example still water.
• the invention also relates to the blow mold for obtaining these bottles.
• the manufacture of a PET bottle consists in blowing a preform obtained by molding of PET, for example by injection or compression, consisting of a tube closed at one end and whose opening is defined by a neck intended to be that of the finished bottle.
• This preform is placed in a mold whose imprint corresponds to the body and bottom of the bottle.
• the preform is brought to a temperature above the glass transition temperature of PET.
• Pressurized air is blown inside the softened preform so that it expands and presses against the walls of the mold, perfectly matching the relief of the mold cavity. Blowing can be completed by stretching carried out by means of a sliding rod.
• the rigidity and mechanical strength of the finished bottle is essentially determined by its shape, its structure, its thicknesses, and by the hardened PET in a more or less crystalline state.
• the bottle comprises, from top to bottom, along its vertical Z axis in the standing position of the bottle on a flat support: a neck, a body and a bottom.
• This body and this bottom can be marked out with different grooves/ribs/steps, according to various and varied patterns, intended to give it an aesthetic shape and the mechanical properties required after filling, in particular impact resistance, sufficient rigidity, and held in a satisfactory standing position.
• Plastic drinking water bottles are in fact stored in packs of several units wrapped in shrink-wrapped plastic film. For storage and transport, these packages are stacked in particular on pallets. It is therefore essential that the bottles filled resist the mechanical stresses imposed by such storage and transport solutions. Any deformation, depression, degradation of the filled bottles are all defects limiting the sale and/or degrading the experience of use.
• blowing pressure which is for example between 25 and 30 bars for bottles of capacity 150 cl, for standard injection blowing technology, i.e. without vents around the injection point.
• Patent application WO 2013/178905 describes a plastic container provided with a body and a bottom extending from the lower end of the body, the bottom comprising a peripheral seat defining a laying plane , a concave vault which extends from a central zone to the seat and a series of reinforcement meetings which extend radially from the central zone to the seat at least.
• the vault has 2 concentric regions, namely a central region and a peripheral region, separated by an axial recess which extends annularly in a continuous manner around the central region, so that the central region is raised with respect to the region peripheral.
• This recess would be a means of stabilizing the container, in particular under conditions of extreme pressure and/or volume.
• This plastic bottle equipped with a specific base can be improved in terms of mechanical properties and weight reduction.
• An object of the invention is to provide a bottle of thermoplastic material such as PET, which provides an optimal compromise between mechanical properties and lightness, in particular thanks to its bottom.
• Another object of the invention is to provide a bottle made of thermoplastic material such as PET, the mechanical properties of which, evaluated in a palletization test, in particular with regard to the ability of the bottles to stand upright, are markedly improved. compared to the existing one, while minimizing the mass of the bottle.
• Another object of the invention is to provide a bottle made of thermoplastic material such as PET, endowed with an optimal compromise between the mechanical properties and the lightness, and able to be blown under usual conditions of heating of the preform and blowing pressure, for a standard injection blowing technology (without vents around the injection point), or even at lower blowing pressures, for identical preform heating temperatures.
• Another object of the invention is to provide a bottle made of thermoplastic material such as PET, resistant to uncontrolled deformations, in particular to turning over or rotating, and in particular when the internal pressure is high.
• Rotulation is a phenomenon according to which, when the container is placed on a flat surface, the axis of the container tilts with respect to a vertical axis (because of the low weight of the container) and the container performs a rotational movement around a theoretical vertical axis, by straightening its axis, until it stops alone, when its axis is placed in the theoretical vertical axis
• Another object of the invention is to provide a bottle made of thermoplastic material such as PET, which has good stability when it is filled and stored on pallets.
• Another object of the invention is to provide a bottle made of thermoplastic material such as PET, which is economical, energy efficient and as eco-compatible as possible, in particular with regard to its manufacture.
• Another object of the invention is to provide an injection blow mold making it possible to produce the bottle as referred to in the above objectives.
• Another object of the invention is to provide a high-performance process for the manufacture by injection blow molding of a bottle as referred to in the above objectives.
• the invention satisfies at least one of the above objectives and relates, according to a first aspect, to a thermoplastic polymer bottle, preferably polyethylene terephthalate or PET, obtained by injection blow molding of an injected preform, comprising from the bottom upwards, along the vertical axis Z of the bottle resting upright on a horizontal support-plane in an XY contact plane, a bottom, a body and a neck; the spatial reference of this bottle being an orthonormal reference [XYZ] of origin O;
• a Z-axis dome extending towards the inside of the bottle and presenting, preferably, a mark of the injection of the preform located in the region of the apex of the dome,
• main grooves preferably equiangular, extending radially from the dome to the side wall, defining between them, on the vault, portions of the vault,
• secondary grooves preferably equiangular, arranged between the main grooves, preferably equidistant from the main grooves, each extending radially between an end Ev in an arch portion (21 ) and a peripheral end Ep in the side wall; characterized in that
• the Pf/Vuf ratio in which Pf is the weight of the bottom and Vuf the useful volume of the bottom is less than or equal to 0.050 g/mL, preferably less than or equal to 0.045 g/mL, and, even more preferably, less or equal to 0.035 g/mL;
• d/D ratio in which d is the radial distance between the Z axis and the end Ev of at least one of the secondary grooves and D the radial distance between the Z axis and the annular edge, is greater than or equal to 0.65; preferably greater than or equal to 0.70;
• 0 do is the diameter of the dome at its base and H d0 its apex height along the Z axis or an axis parallel to Z, is greater than or equal to 4.4, of preference to 4.8.
• Pf/Vuf, d/D, 0 do /H do ratios are the expression of a judiciously designed arrangement of the shape and the grooving of the bottom of the bottle, which results in an optimal distribution, mechanically speaking, thermoplastic material in the bottom of the bottle. This arrangement also improves the circulation of the molten plastic material in the mold during manufacture.
• the bottle according to the invention thus has a level of quality corresponding to a low percentage of defects caused by the constraints of palletization, compared to the negative controls of the prior art.
• the bottle according to the invention is also distinguished in that it has at least one of the characteristics set out below in paragraphs 22 to 44.
• the thickness of the bottom of the bottle decreases radially constantly along a radial generating line G extending, outside the zones comprising the main and secondary grooves, from the axis Z to the edge annular.
• This radial generatrix is for example G2 along the section line (C-C), shown in Figure 7.
• the thickness e is greater than or equal to 1200 ⁇ m at the level of the dome
• the thickness e is less than or equal to 150 ⁇ m at the level of the annular edge.
• the thickness e is:
• the bottle is such that the thickness of the bottom decreases radially constantly along three generatrices G1, G2 and G3 extending from the center of the dome towards the periphery of the bottom, distributed in an equiangular manner, on portions vault excluding any grooves.
• the thicknesses are measured at different radial distances, increasing on each generatrix, from the center to the periphery.
• G1, G2 and G3 are thus defined as shown in FIG. 7 and by reference to the orthonormal reference [XYZ] whose origin is point O: * G1: radial direction along the X axis, between the Z axis and the bottom side wall;
• G2 radial direction at an angle of 120° with respect to G1 in the clockwise direction of rotation, between the Z axis and the side wall of the bottom;
• G3 radial direction at an angle of 240° with respect to G1 in the clockwise direction of rotation, between the Z axis and the side wall of the bottom.
• G corresponding to G1, G2 or G3
• the thickness e of the bottom wall (2) can vary as follows:
• the thickness e of the bottom wall (2) can vary as follows:
• the thickness e of the bottom wall (2) can vary as follows:
• the thickness e of the bottom wall (2) can vary as follows:
• the bottom according to the invention offers good axial distribution of the material.
• the standard deviation, at the same abscissa G(x) according to the three generatrices, is reduced.
• the average standard deviation on the part of the bottom extending from the Z axis to the annular edge is thus, preferably less than or equal to 35 ⁇ m.
• the bottle is such that the ratio d/D in which d is the radial distance between the Z axis and the end Ev of at least one of the secondary grooves and D the radial distance between the Z axis and the annular edge, is greater than or equal to 0.65, preferably greater than or equal to 0.70.
• at least one of the main grooves in the bottom of the bottle has the general shape of an inverted "U" in straight cross section, in a plane parallel to the Z axis; and the branches of the "U” form between them an alpha angle of between 30 and 50°, preferably between 45 and 55°.
• At least one of the secondary grooves in the bottom of the bottle has the general shape of an inverted "V” in straight cross section, in a plane parallel to the Z axis and the branches of the " V” form between them an angle alpha2 of between 45 and 65°, preferably between 50 and 60°.
• each vault portion of the coronary vault of the bottom of the bottle comprises a substantially rectilinear radial profile.
• each vault portion of the coronary vault of the bottom of the bottle comprises a profile forming an angle alpha3 with the contact plane XY of between 5 and 20°, preferably between 10 and 15°.
• At least one of its parts, bottom, body and neck of the bottle has a circular shape in straight cross section, in a plane parallel to the contact plane XY.
• the neck of the bottle has a non-circular shape (for example oval or rectangular, in particular square) in straight cross section, in a plane parallel to the contact plane XY.
• a non-circular shape for example oval or rectangular, in particular square
• the bottle has a volume capacity in centilitres: from 20 to 30 cL, or from 30 to 40 cL, or from 40 to 60 cL, or from 60 to 80 cL, or from 80 to 110 cL , or from 110 to 130 cL, or from 130 to 160 cL, or from 160 to 180 cL, or from 180 to 220 cL, or from 220 to 260 cL, preferably 25 cL, or 33 cL, or 50 cL, or 75 cL, or 100 cL, or 125 cL, or 150 cL, or 175 cL, or 200 cL.
• each main groove has an end in the arch Ev and a peripheral end EP in the side wall. Furthermore, the end Ev of all or part of the main grooves is open and opens under the dome, and/or the end Ep of all or part of the main grooves is open and opens towards the outside of the bottle.
• the end Ep of all or part of the secondary grooves is open and opens outwards from the bottle, preferably below the end Ep of at least one of the main grooves. adjacent. According to another characteristic, the end Ev of all or part of the secondary grooves is open and opens out under the arch.
• the end EV of all or part of the secondary grooves is profiled at a point, this point forming an angle alpha4 less than or equal to 30°, preferably 20°.
• the invention relates to an injection blow mold, one of the parts of which has an imprint making it possible to obtain the bottle according to the invention.
• the invention relates to a method for manufacturing the bottle according to the invention, consisting in implementing a preform, preferably obtained by injection, in a blow molding technology, optionally comprising stretching, using the mold according to the invention.
• FIG. 1 is a perspective view of a preform intended for the manufacture of the bottle according to the invention by blow molding.
• FIG. 2 is a sectional view of Figure 1 along the median diametral plane of the preform shown in this Figure 1.
• FIG. 3 is a front view of one embodiment of a bottle according to the invention.
• Fig. 4 is a front view of one embodiment of a bottle according to the invention.
• FIG. 4 is a perspective view of another embodiment of a bottle according to the invention.
• FIG. 5 is a bottom and front view of the bottom of the bottle of FIG. 3.
• FIG. 6 [0053]
• FIG. 6 is a perspective bottom view of the bottom of the bottle of Figure 4.
• FIG. 7 is a bottom and front view of the bottom of the bottle of FIG. 4.
• FIG. 8 is a bottom and front view of the bottom of the bottle of FIG. 4.
• FIG. 8 is a side view of Figure 7.
• FIG. 9 is a perspective view of the bottom of Figures 7 and 8.
• FIG. 10 is a cross-section along line A-A of Figure 7.
• FIG. 11 is a cross-section along line B-B of Figure 7.
• FIG. 12 is a sectional view along line C-C of FIG. 7.
• FIG. 13 is a sectional view along line C-C of FIG. 7.
• FIG. 13 is a detail view H of figure 12.
• FIG. 14 is a cross-section along line D-D of Figure 7.
• FIG. 15 is a cross-section along line F-F of Figure 7.
• FIG. 16 is a diametric sectional view of the preform used to manufacture a bottle according to the invention used in example 1.
• FIG. 17 is a side view of a bottle according to the invention used in example 1 from the preform of figure 16.
• FIG. 18 is a bottom view showing the bottom of the bottle shown in Figure 17.
• Fig. 19 is a bottom view showing the bottom of the bottle shown in Figure 17.
• FIG. 19 is a bottom photograph showing the bottom of the bottle shown in Figure 17.
• FIG. 20 is a partial perspective view from below showing the bottom of the bottle shown in Figure 17.
• FIG. 21 is a bottom photograph showing the bottom of the negative control bottle used in Comparative Example 2.
• Fig. 22 is a bottom photograph showing the bottom of the negative control bottle used in Comparative Example 2.
• FIG. 22 is a side view in partial diametral section of the preform used to manufacture a bottle according to the invention used in Example 3.
• FIG. 23 is a side view of a bottle according to the invention used in example 3 from the preform of figure 22.
• FIG. 24 is a bottom view showing the bottom of the bottle shown in Figure 23.
• FIG. 25 is a bottom photograph showing the bottom of the bottle shown in Figure 23.
• FIG. 26 is a partial bottom perspective view showing the bottom of the bottle shown in FIG. 23.
• FIG. 27 is a partial bottom perspective view showing the bottom of the bottle shown in FIG. 23.
• FIG. 27 is a bottom photograph showing the bottom of the negative control bottle used in Comparative Example 4.
• thermoplastic refers to a thermos plastic or moldable copolymer or homopolymer that becomes fluid, viscous, bendable, moldable above a specific temperature (e.g. glass transition temperature) and returns to a solid state / hardened after cooling.
• the container at the heart of the invention is a bottle 1 made of thermoplastic polymer material, preferably polyethylene terephthalate or PET.
• This bottle 1 represented in FIGS. 3 and 4 is described below with reference to a three-dimensional orthonormal reference [XYZ] of origin O.
• the axis Z-Z or Z is the axis of the bottle 1.
• the axes X_X or X and Y-Y or Y define an XY plane which is the plane of contact between the bottom of the bottle and a horizontal plane support on which this bottle rests when standing.
• the origin O of the XYZ orthonormal coordinate system is in this XY plane.
• Figures 3, 5, 6 and 9, in particular, show this spatial reference XYZ.
• the bottle 1 comprises, from bottom to top, along the Z axis, a bottom 2, a body 3 and a neck 4 delimiting the upper opening 5 of the bottle 1 and separated from the body 3 by a collar of support 6, itself surmounted by a thread 7, intended to cooperate with a screw cap for closing the bottle 1.
• the body 3 of the bottle 1 comprises grooving and ribbing patterns, known per se and not referenced in the figures and intended to contribute to the mechanical strength of the body 3.
• the terms “inside”, “internal”, “outwards”, relate to an element close to or in the direction of the Z axis of the bottle 1 or within the enclosure 8 defined by the bottom 2, the body 3 and the neck 4, forming an envelope delimiting this enclosure 8 of the bottle 1, and the terms "exterior”, “external”,
• This bottle 1 is produced industrially by injection-blow molding technology, of a preform sufficiently heated to be fluid, in a mold comprising the imprint of the bottle.
• the blowing is possibly supplemented by a stretching using an axial rod introduced into the preform (“Injection Stretching Blow Molding” ISBM).
• Figures 1 and 2 show an example of this preform 100 in the form of a Z-axis tube, defined by a wall 101, open at its upper end 102 comprising the neck 4 of the future bottle 1 and whose base 103 has a generally hemispherical shape.
• the lower end of the base 103 comprises on the outer face of the wall 101, a prominence 104 extending outwards, along the axis Z. The latter is a mark of the injection point of the preform 100.
• the preform does not have such a mark.
• the bottom 2 of this bottle 1 comprises successively and centrifugally:
• annular seat 13 intended to be in contact with the support-plane in an XY contact plane on which the bottle 1 can rest in the upright position
• a side wall 14 extending in a non-horizontal direction (different from XY), up to the body, at a height H of 15 mm with a height hO located at the level of the plane of the seat 13 which coincides with the XY contact plane of the support-plane, on which the bottle 1 can rest in the upright position.
• Figures 5, 6, 7 and 9 show that the underside of the bottom 2 is marked by radial mechanical reinforcement grooves of 2 types: main grooves 16 and secondary grooves 17.
• G1 radial direction along the X axis, between the Z axis and the side wall of the bottom 2;
• G2 radial direction at an angle of 120° relative to G1 in the clockwise direction of rotation, between the Z axis and the side wall of the bottom 2
• G3 radial direction at an angle of 240° with respect to G1 in the clockwise direction of rotation, between the Z axis and the side wall of the bottom 2.
• Mf is measured by weighing the dry bottom and Vuf by filling it with water to a level such that the meniscus is concave, the edge of this meniscus being included in the plane perpendicular to Z corresponding to the upper end of the side wall 14 of bottom 2.
• the thickness of the bottom 2 decreases radially constantly, from the Z axis (dome 9) at least to the annular edge 15, excluding the areas comprising the main and secondary grooves, that is to say for example along the control line 16 - shown in Figure 7.
• the thickness e of the bottom wall 2 can vary as follows:
• the thickness e of the bottom wall 2 can vary as follows:
• the thickness e of the bottom wall 2 can vary as follows:
• the Z-axis dome 9 extends towards the inside (enclosure 8) of the bottle 1.
• the region of the apex 11 of the dome 9 comprises a convex well 111 of axis Z.
• the mark 104 of the injection of the preform 100 corresponds to the well 111 seen on the outside of the bottom 2.
• the well 111 can correspond at a preform injection point.
• the region of the apex 11 is defined by the peripheral edge of the well 111 , in the plane P A perpendicular to Z. According to a variant in which the region of the apex 11 of the dome 9 is not a well 111 , but a point 11 apex.
• the plane P A orthogonal to Z includes only the apex point 11 .
• the dome 9 preferably extends between the plane P A and its base which is inscribed in a plane P B parallel to P A comprising the circle corresponding to the inflection (i.e. curvature rupture) between the coronary vault 12 and the dome 9.
• the vault crown 12 throughout its thickness, is advantageously rectilinear in section view along the vertical plane including the Z axis.
• the distance between the plane P A and the plane P B corresponds to the height H d0 of the dome 9 (FIG. 14).
• the diameter of the circle defining the base of the dome 9 is designated by the reference 0 do .
• the 0 d0 /H d0 ratio is one of the remarkable characteristics of the invention. Preferably greater than or equal to 4.5, it is, for example, between 4.6 and 10, or better still between 4.6 and 8.
• the coronal vault (“in the sense that it forms a crown between the dome and the seat”) 12 connects the base of the dome 9 to the annular edge 18 of the annular seat 13.
• this coronal vault 10 is a thin part of the bottom 2, which projects in the centripetal direction towards the inside of the bottle 1 (enclosure 8).
• the thickness of this vault 12 is for example slightly increasing from the dome 9 towards the annular base.
• Its inner face 12i in vertical section along the Z axis (section CC of FIG. 7 shown in FIG. 13) is preferably rectilinear, but according to a variant, it could be curvilinear or even wavy. In one embodiment of this preferred embodiment according to a rectilinear radial profile, this inner face 12i of the vault 12 forms an angle alpha3 with the contact plane XY, which can for example be of the order of 12°.
• the annular seat 13, delimited by the annular edge 18 and the peripheral annular edge 15, is intended to be the zone of contact with the support-plan on which the bottle 1 can rest in the upright position. It belongs to the XY plane. Its thickness from the edge 18 to the edge 15 is advantageously decreasing, or even constant.
• the annular edge 15 forms an inflection limit from which the side wall 14 rises from hO on the XY plane up to H equal to 15 mm at the level of the plane perpendicular to Z corresponding to the upper end of this side wall 14 of the bottom 2.
• the main grooves 16 are 5 in number in the embodiment of Figure 5 in the embodiment of Figures 6 to 14. These main grooves 16 extend radially from the dome 9 to the wall side 14. They are separated from each other by the same angular difference, 72° for the embodiment of Figure 5 and 60° for the embodiment of Figures 6 to 14.
• the main radial ribs 16 each have an open central end 19 hollowed out in the dome 9 and an open peripheral end 20 located on the side wall 14.
• the FIG. 15 shows the general inverted "U" shape of the straight cross section of each main groove 16 and the alpha angle defined by the side faces of the groove 16, on either side, of the median diametral plane PD (branches of the "U").
• the angle alpha is for example equal to 40° plus or minus 5°.
• the main radial grooves 16 cross the entire coronary vault 12 and thus delimit similar portions of the vault 21 .
• the secondary radial grooves 17 are arranged between the main radial grooves 16.
• the secondary radial grooves 17 are equiangular with each other and are each separated from the 2 related main radial grooves 16, by the same angle.
• the secondary radial grooves 17 are 5 in number in the embodiment shown in Figure 5 and 6 in number in the embodiment shown in Figure 6, 7, 9.
• Each secondary radial groove 17 has an open end Ev located in an arch portion 21 and a peripheral open end Ep printed in the side wall 14. As shown in Figure 7, each end Ev is separated from the Z axis by a distance d, which is another of the remarkable parameters of the invention. Each secondary radial groove 17 can thus contribute to the stiffening and mechanical reinforcement of the bottom 2 of the bottle 1, without hindering the circulation of the molten plastic material during the injection-blow molding. In accordance with the invention, this distance d between Ev and Z, is defined relatively with respect to the distance D which is the radial distance between the axis Z and the annular edge 15 (see FIG. 7).
• the d/D ratio is advantageously greater than or equal to 0.65; preferably at 0.65, for example between 0.70 and 1.0; and, better still between 0.71 and 0.80.
• Figures 8, 10 and 11 show that the peripheral open ends Ev of the secondary radial grooves 17 are located at a lower height than that of the open peripheral ends 20 of the main radial grooves 16.
• FIG. 15 shows the general "V" shape of the straight cross section of each secondary groove 17 and the angle alpha2 defined by the side faces of the groove 17, on either side, of the median diametral plane P F ( branches of the "V").
• the angle alpha2 is for example equal to 55° plus or minus 5°.
• each secondary radial groove 17 has a profiled shape whose tip is the end Ev, at a distance d from the Z axis.
• the angle alpha4 determined by this profiled shape is between 20 and 60, preferably between 30 and 20. This value is consistent with a search for optimal circulation of molten plastic material during the shaping of the bottle by injection blow molding, to ultimately obtain a distribution of thermoplastic material adapted to the objectives of lightness and mechanical resistance.
• the exemplary embodiments shown in the figures correspond to a circular shape of bottle in straight cross-section, according to a plane parallel to the contact plane XY.
• the invention also encompasses any non-circular bottle shape. Consequently, by convention, the qualifiers relating to the circular shape: "radial”, “annular”, “diameter”... would be transposed to the description of a bottle according to the invention of non-circular shape in straight cross section. .
• 150 cL PET bottles are manufactured by injecting a preform model then blowing. Blowing is carried out by heating preforms using lamps distributed along these preforms, then introduction into molds, then stretching and blowing into the molds. [0097] The molds consist of two half-molds for the body of the bottles and a mold bottom for the bottoms of the bottles.
• the weight of PET in the bottom is adjusted by varying the heating intensity of the different lamps: an increase in heating at the bottom of the preform makes it possible to reduce the quantity of PET at the bottom of the bottle.
• the bottles are analyzed by measurements (weight and volume of the bottom, distances, thickness measurements) and the bottles obtained are evaluated by a palletization test.
• Bottom weight and volume the bottom of a bottle is cut to a height of 15 mm. The weight is measured, as well as the useful volume.
• the thicknesses of the bottom are measured along three generatrices G1, G2 and G3 extending from the center of the dome towards the periphery of the bottom, distributed in an equiangular manner, on portions of the vault excluding any groove (cf. ⁇ [0027] supra ).
• the thicknesses are measured at different radial distances, increasing on each generatrix, from the center to the periphery. We report, for each radial distance, the average thickness for the 3 generatrices, and the standard deviation of the thicknesses for the 3 generatrices.
• the thickness profiles are reported in Table 2.
• the filled and corked bottles are grouped together in packs of 6 bottles wrapped in shrink film.
• the packs are arranged on 800 mm x 1200 mm pallets, in 4 superimposed layers of 21 packs, separated by a layer of cardboard.
• Bottle pallets are wrapped in plastic film.
• the pallets are subjected to a transport simulation by placing them on a vibrating table for 4 hours, for storage for 10 days at 40° C. at 40% humidity.
• the bottles are analyzed in a similar manner and the bottles obtained are evaluated by a palletization test of the same nature, adapted to the format of the bottles.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Ceramic Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Containers Having Bodies Formed In One Piece (AREA)
• Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

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• 2021
  • 2021-03-02 FR FR2102028A patent/FR3120353B1/fr active Active
• 2022
  • 2022-02-25 AR ARP220100428A patent/AR124986A1/es active IP Right Grant
  • 2022-03-01 US US18/279,420 patent/US12534261B2/en active Active
  • 2022-03-01 BR BR112023017959A patent/BR112023017959A2/pt unknown
  • 2022-03-01 WO PCT/FR2022/050359 patent/WO2022185003A1/fr not_active Ceased
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