Method for manufacturing a glass bottle and packaging device comprising such a bottle

Abstract

Method for manufacturing a glass bottle and packaging device comprising such a bottle. Method for manufacturing a glass bottle (20) having a ratio L=0.44*m / V0.77 less than or equal to 0.7, comprising the steps of: depositing a drop of molten glass (1) into a blank mold (11), forming a parison (15), opening the blank mold (11) and transferring the parison (15) into a finishing mold (17), this transfer being carried out by retaining the neck of the parison (15) by a holding part (14) so ​​as to allow the parison (15) to stretch during the transfer, blowing air into the parison (15) to form the bottle (20), said attachment relief (21) being formed by said holding part (14). Figure for the abstract: Fig. 3

Description

Title of the invention: Method for manufacturing a glass bottle and packaging device comprising such a bottle technical field

[0001] The present invention relates to the manufacture of glass bottles and packaging devices comprising such bottles. Previous technique

[0002] It is known to package certain cosmetic compositions, such as lotions, oils, serums or perfumes, in packaging devices comprising glass bottles.

[0003] The bottles classically comprise a body surmounted by a neck, and are manufactured according to a conventional process called press-blowing, as illustrated in [Fig.1] or by a process called blow-blowing on machines called "I / S".

[0004] The press-blowing process comprises (step A) depositing a droplet 1 of glass at a temperature above its softening temperature, typically soda-lime glass, into a blank mold 2, pressing this droplet to form a blank 3 (steps B and C), inverting the blank 3 using a rotating arm 5 to transfer it into a finishing mold 6 (steps D and E), and blowing the bottle (step F). In the case of the blow-blowing process, the step of pressing the glass droplet is replaced by a blowing step.

[0005] The vials obtained by such a process have a relatively thick wall, typically greater than 1mm, and are relatively heavy.

[0006] A ratio "L" has been proposed by the company Bûcher Ernhart Glass to quantify the weight reduction of a bottle. This ratio is given by the formula L=0.44*m / V°'77 where m represents the empty weight of the bottle in g, and V the capacity in cm3 measured at the neck.

[0007] Figure 2 shows the curves corresponding to different values ​​of mass and capacity at the neck for given values ​​of the ratio L.

[0008] Existing bottles with a capacity greater than 100 mL have a value of the L ratio significantly greater than 0.7, typically between 1 and 1.2, with essentially cylindrical shapes of revolution.

[0009] There are also known "rotary press and blow" manufacturing processes for stemmed glasses in which a drop of molten glass is deposited into a blank mold where a punch is applied, then the blank mold opens and the parison is transported into a finishing mold. This transport is achieved by holding the neck of the parison in the machine by a retaining piece, which allows the parison to stretch under the effect of gravity. In the finishing mold, the parison The glass is rotated relative to the finishing mold, and air is blown into the parison to press it against the mold wall and form the bowl of the glass. Next, the stem and base of the glass are attached, and the portion of the neck previously held in the machine's retaining piece is cut away to form the rim of the glass. This cut-away portion, retained in the retaining piece, is then returned to the furnace.

[0010] US patent application US2018 / 0072603A1 describes an installation for forming glass containers, with a machine comprising a neck-holding system for forming reliefs on the neck. More specifically, this application describes a method for manufacturing a glass container in the form of a jar, having a cylindrical body of revolution, in which the parison is rotated within the finishing mold during blowing. This rotation is made possible by the steam generated on the surface of the finishing mold due to the spraying of water for cooling. This application mentions the possibility of obtaining a thin side wall, less than 1 mm thick, and a weight-to-capacity ratio of less than 2 g / cm³ and as low as 0.5 g / cm³. Description of the invention

[0011] The proposal of eco-responsible, environmentally friendly solutions, whose design and development take into account environmental issues, is becoming a major concern in order to contribute to meeting planetary challenges.

[0012] It is therefore essential to design more durable products, thereby reducing the amount of materials used.

[0013] In this context, it is important to develop containers optimized for the quantity of product transported.

[0014] There is therefore a need to reduce the carbon footprint associated with the manufacture of glass bottles and to reduce as much as possible the value of the aforementioned parameter L, and in particular to bring it below the threshold of 0.7, in order to maximize the capacity of the bottle according to its weight.

[0015] The invention aims to meet this need. Summary of the invention

[0016] The invention thus relates to a method for manufacturing a glass bottle comprising a body surmounted by a neck, the neck having a raised feature for attaching a closure and / or dispensing means, the bottle having a ratio L (given by the formula L=0.44*m / V°'77 where m denotes the empty weight of the bottle in g, and V the capacity in cm3 measured to the brim of the neck) less than or equal to 0.7, the method comprising the steps of: - place a drop of molten glass into a roughing mold, - to form a parison, - open the roughing mold and transfer the parison into a finishing mold, this transfer being carried out by holding the neck of the parison by a retaining part so as to allow the parison to stretch during the transfer, - blowing air into the parison present in the finishing mold to form the bottle, the said attachment relief being formed by the said retaining part.

[0017] Thanks to the invention, it is possible to manufacture a relatively light bottle, in particular one whose L ratio value is less than 0.7, but which nevertheless meets the requirements for use, in particular in terms of mechanical strength.

[0018] The invention makes it possible to produce large bottles with a wide variety of geometries.

[0019] In the invention, the shape resulting from the retaining part is maintained on the container to make it a bottle with a neck. The attachment feature on the neck can be an annular ridge (also called a rim), a bayonet, one or more screw threads, among other possibilities.

[0020] The body may have an asymmetrical shape of revolution, the finishing mold having an asymmetrical internal surface of revolution, the parison being fixed in rotation relative to the finishing mold during air blowing. Alternatively, the body may have a symmetrical shape of revolution, the parison being able to rotate within the finishing mold during air blowing. The attachment relief may be formed in its final shape by the roughing mold.

[0021] The collar can be made with a relatively low manufacturing tolerance, for example + / - 0.4mm or less.

[0022] The bottle may have a relatively large capacity (measured to the rim of the neck), in particular greater than or equal to 100 mL, preferably between 100 and 500 mL, and better from 100 to 250 mL.

[0023] Preferably, the parison is formed using a punch in the roughing mold.

[0024] During transport of the parison, it can stretch, which helps to reduce the thickness of its wall. The stretching of the parison from below can occur under the effect of gravity, as it is suspended from above. The hot glass is also still fluid, which causes its wall to thin and the desired length to be reached.

[0025] The parameter L of a bottle according to the invention is preferably less than or equal to 0.6, even better between 0.4 and 0.6.

[0026] The wall thickness of the bottle, measured at the level of the body of the bottle, in particular at mid-height of the bottle, may be less than 1mm, better less than or equal to 0.8mm, even better between 0.3mm and 0.8mm.

[0027] The roughing and / or finishing molds can be cooled by spraying or flowing water, particularly on their inner wall.

[0028] The mold cavity of the finishing mold may have a cross-section having symmetry with respect to a median plane.

[0029] The bottle body may have facets. In particular, the bottle body may have facets extending obliquely downwards and outwards from the base of the bottle shoulders to an edge defining the greatest width and depth of the bottle body, and facets extending obliquely downwards and inwards from this edge towards the bottom of the bottle. Such a bottle shape offers good mechanical strength.

[0030] The cavity of the finishing mold can be configured to form the bottle with a body connected to a neck by shoulders extending obliquely downwards at an angle to the perpendicular to the longitudinal axis of the bottle greater than or equal to 10°, for example 30°. Such a shape contributes to giving the bottle good resistance to axial compression.

[0031] The mold cavity of the finishing mold may have a substantially flat bottom. By "substantially flat," it is understood that the shape of the bottom of the bottle allows it to rest vertically when placed on a horizontal flat surface.

[0032] The glass is preferably a soda-lime glass.

[0033] The invention also relates to a glass bottle, in particular obtained by the process according to the invention, having a capacity greater than or equal to 100 mL, a parameter value L less than or equal to 0.7, a substantially flat base, a body preferably without rotational symmetry, and a neck having a raised feature for attaching a closure and / or dispensing means. This raised feature is preferably an annular ridge.

[0034] The invention further relates to a packaging device comprising a bottle according to the invention. This packaging device may include a closure and / or dispensing means mounted on the neck of the bottle. This closure and / or dispensing means may include a collar fixed to the neck, for example, snapped onto it, and a sealing and / or dispensing element mounted on the collar or held in the neck by means of it. The collar may be made of plastic or metal. The sealing element may be a hinged lid or a screw or snap-on cap. The dispensing element may be a pump, a pipette, or a valve, among others.

[0035] The device may contain a cosmetic, skincare, or makeup composition, for example a lotion, an oil or a serum, or even a perfume. Brief description of the drawings

[0036] The invention will be better understood upon reading the detailed description that follows, a non-limiting example of its implementation, and upon examination of the accompanying drawing, in which:

[0037] [Fig-1] [Fig.1], previously described, illustrates a manufacturing process according to the art prior,

[0038] [Fig.2] [Fig.2] illustrates different curves showing the weight as a function of the capacity for various values ​​of the parameter L,

[0039] [Fig.3] [Fig.3] illustrates different stages of an example of a manufacturing process according to the invention,

[0040] [Fig.4] [Fig.4] represents an example of a conditioning device made with a bottle according to the invention,

[0041] [Fig.5] [Fig.5] is an elevation view of the bottle in [Fig.4],

[0042] [Fig.6] [Fig.6] is a side view along VI of [Fig.5], and

[0043] [Fig.7] [Fig.7] is a top view along VII of [Fig.5]. Description of the implementation methods

[0044] Fig. 3 schematically illustrates steps in an example of a manufacturing process for a glass bottle according to the invention.

[0045] This manufacturing process can begin by providing a roughing mold 11 in step A and by depositing a drop of molten glass 1 in this mold in step B.

[0046] The roughing mold 11 may belong to a carousel of a vertical rotary machine and includes a removable upper part 14.

[0047] The roughing mold 11 may include a removable bottom 1 la and be cooled prior to closing the bottom 1 la by projecting or flowing water onto its inner wall, as schematically illustrated.

[0048] In step C a punch 13 presses the drop into the mold 11 to form a parison 15. The pressing by the punch forces the glass to be in contact with the upper part 14 of the mold 11.

[0049] The parison 15 is then transported to step D by the upper part 14 of the mold 11, which serves as a holding part, to a finishing station.

[0050] During this transport, the parison 15 is suspended from the support part 14 and can stretch under the effect of its weight, to take its final shape.

[0051] Upon arrival at the finishing station, at step E, a finishing mold 17 cooled by water spray is closed on the parison at step F. This mold 17 comprises, for example, two lateral parts 17a and a bottom 17b.

[0052] The retaining part 14 forms the upper part of the finishing mold 17.

[0053] A gas, for example compressed air, is injected into the parison 15 in step G, to form the body of the flask 20.

[0054] The bottle 20 can then be extracted from the mold 17, and released by the retaining part 14. The latter can be made with movable parts that can move apart from each other.

[0055] Bottle 20 is for example as illustrated in figures 4 to 7.

[0056] It comprises a body 24 surmounted by a neck 23.

[0057] The retaining part 14 has an internal surface allowing the formation of a hooking relief 21 on the neck of the bottle, for example in the form of an annular ridge.

[0058] The retaining part 14 can be made in accordance with the teaching of US2018 / 0072603A1 while being modified to preferably form an annular bead, but as an alternative to screw threads or other reliefs.

[0059] During the blowing of the parison in step G, the parison 15 is fixed in rotation relative to the mold 17, the latter having in the illustrated example an internal surface 80 not symmetric of revolution corresponding to the shape to be given to the body 24. In a variant not illustrated, the internal surface 80 is symmetric of revolution, in which case the parison can be driven in rotation during the blowing.

[0060] The manufacturing process may include additional conventional steps such as annealing.

[0061] In the illustrated example, the body 24 of the bottle 20 has a polygonal cross-section, with, for example, facets 124a and 124b in the center of the front and rear faces, and facets 126a, 126b, 128a and 128b, which are less wide, on the sides.

[0062] The facets 124a, 126a and 128a extend from the base of the shoulders 27 of the bottle, obliquely downwards and outwards, to an edge 29 extending perpendicularly to the longitudinal axis X of the bottle, and defining the greatest width W and depth l of the body 24 of the bottle.

[0063] The facets 124b, 126b and 128b extend obliquely inwards and downwards, from edge 29 towards bottom 30.

[0064] The width 5 of the body at the base of the shoulders 27 is less than the depth l of the bottle.

[0065] The shoulders 27 may have a slope going from the base of the neck 23 to the facets 124a, 126a and 128a, which makes an angle p with the perpendicular to the longitudinal axis X, of at least 20°, for example 30° as illustrated.

[0066] The glass can receive various treatments known to improve its resistance, where appropriate.

[0067] The bottom 30 of the bottle is substantially flat, ensuring optimal stability.

[0068] The total height of the bottle 20 ranges, for example, from 100 to 200 mm.

[0069] The external diameter D of the neck 23, at its upper end, outside the relief 21, goes for example from 30 to 40 mm.

[0070] The greatest width W of the bottle body, when viewed from the front as in [Fig.5], ranges for example from 35 to 100 mm.

[0071] The depth l of the bottle body, when viewed from the side as in [Fig. 6], ranges, for example, from 100 to 200 mm

[0072] The neck 23 of the bottle 20 is intended to be equipped with a closing and / or dispensing means.

[0073] This closing and / or distribution means may comprise, as schematically shown in [Fig. 4], a collar 40 fixed to the neck 23, carrying a closing or distribution member 4L

[0074] The fret 40 can be a piece of thermoplastic material having snap-fit ​​reliefs on the relief 21, or a metal piece crimped onto the neck 23.

[0075] The component 41 mounted on the fret 40 is, for example, a removable plug, which can be snapped into a distribution orifice formed with the fret 40, or fixed onto a distribution nozzle formed with the fret 40.

[0076] The component 41 can also be a pump carried by the fret 40, or a pipette.

[0077] Thanks to the manufacturing process according to the invention, the parameter L for the bottle is less than or equal to 0.7, better to 0.6, even better between 0.4 and 0.6. The wall thickness of the vial measured at the level of the body of the vial, for example in the middle of a facet 124a, may be less than 1mm, better less than or equal to 0.8mm, even better between 0.5mm and 0.8mm. Examples

[0078] A soda-lime glass bottle with the geometry illustrated in Figures 4 to 7, with a capacity of 370 mL and a weight of 96 g, and a value of parameter L of 0.5, was manufactured using the process of [Fig.3]. The values ​​of W, / and s are respectively 82mm, 57.8mm and 55mm.

[0079] Of course, the invention is not limited to the example just described.

[0080] In particular, the shape of the bottle 20 illustrated in the figures is given only as a non-limiting example, and the mold cavity of the finishing mold 17 can be made with a different shape.

[0081] The dimension ranges W and / mentioned above are valid for bottles having different shapes.

Claims

Demands

1. A method for manufacturing a glass bottle (20) comprising a body (24) surmounted by a neck (23), the neck (23) having a raised section (21) for attaching a closure and / or dispensing means (40, 41), the bottle having a ratio L given by the formula L = 0.44 * m / V, where m represents the empty weight of the bottle in g, and V the capacity in cm³ measured to the brim of the neck, less than or equal to 0.7, the method comprising the steps of: - depositing a drop of molten glass (1) into a roughing mold (11), - forming a parison (15), - opening the roughing mold (11) and transferring the parison (15) into a finishing mold (17), this transfer being carried out by retaining the neck of the parison (15) by a retaining part (14) so ​​as to allow the parison (15) to stretching during the transfer, - blowing air into the parison (15) present in the finishing mold (17) to form the bottle (20),said attachment relief (21) being formed by said retaining part (14).

2. Method according to claim 1, the body (24) having a non-symmetrical shape of revolution, the finishing mold having an internal surface (80) that is not symmetrical of revolution, the parison being immobile in rotation relative to the finishing mold during the blowing of air.

3. Method according to claim 1 or 2, the parison (15) being formed using a punch (13) in the roughing mold (11).

4. A method according to any one of claims 1 to 3, wherein the finishing mold (17) and / or the roughing mold are cooled by spraying or flowing water, in particular on their inner wall.

5. A method according to any one of the preceding claims, the capacity to the neck of the bottle (20) being between 100 and 500 mL, and preferably from 100 to 250 mL.

6. Method according to any one of the preceding claims, the cavity of the finishing mold (17) having a cross-section having symmetry with respect to a median plane.

7. Method according to any one of the preceding claims, the cavity of the finishing mold (17) having a substantially flat bottom (17b).

8. Method according to any one of the preceding claims, the wall thickness of the bottle (20) measured at the body (24) of the bottle being less than 1mm, better less than or equal to 0.8mm, even better between 0.5mm and 0.8mm.

9. A method according to any one of the preceding claims, the parameter L for the bottle being less than or equal to 0.6, more preferably between 0.4 and 0.

6.

10. A method according to any one of the preceding claims, wherein the cavity of the finishing mold (17) is configured to form the bottle with a body (24) connected to a neck (23) by shoulders (27) extending obliquely downwards at an angle (p) to the perpendicular to the longitudinal axis (X) of the bottle greater than or equal to 10°

11. IV. Method according to any one of the preceding claims, the glass being a soda-lime glass.

12. Glass bottle (11) having a capacity to the neck greater than 100 mL, a parameter value L less than or equal to 0.7, a substantially flat base (35), a body (24) preferably without rotational symmetry and a neck (23) having a relief (21) for the attachment of a closure and / or dispensing means (40, 41).

13. Bottle according to claim 12, the thickness of the wall of the bottle measured at the body of the bottle being less than 1mm, better less than or equal to 0.8mm, even better between 0.5mm and 0.8mm.

14. Bottle according to any one of claims 12 and 13, having a body (24) connected to a neck (23) by shoulders (27) extending obliquely downwards at an angle (p) with respect to the perpendicular to the longitudinal axis (X) of the bottle greater than or equal to 10°.

15. Bottle according to any one of the preceding claims, the body (24) being without rotational symmetry.

16. Packaging device comprising a bottle (20) according to any one of claims 12 to 15 and a closing and / or dispensing means (40, 41) mounted on the neck (23) of the bottle.

17. Device according to claim 16, containing a cosmetic composition.

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