ES2297803T3 - BOTTLE MANUFACTURED IN PLASTIC MATERIAL WITH REINFORCED FUND. - Google Patents

Abstract

During the forming stage of the bottle in the special mould parts, first linear ribs (2), in relief outwards, parallel with each other, symmetrically arranged and with a curved external profile (102), are obtained on the bottom (301), raised and with the form of a spherical cap of the bottle itself, these ribs being, for example, five in number, or in another preferably odd number, in such a way that one of these is located on the centreline of the bottom of the bottle and these ribs are oriented perpendicularly compared with the ideal vertical plane on which the crushed part (101') of the top sprue (101) of the bottle lies. During the same forming stage as that of said first ribs (2), perpendicularly to these and at least on the centreline of the bottle's bottom, at least one second rib (3) is obtained, adjacent to and aligned with the bottom sprue of the bottle itself and which is composed of a bottom part (103) in contact with the bottom of the bottle, which intersects with and is fixed to said first ribs (2) and which protrudes with short sections (103') from the outer ones of the first ribs (2) themselves, and this second rib (3) comprises on said bottom part (103) and along the entire length, a median ridge (203) with limited thickness, with stiffening and heat dispersion functions. The bottom support edge (401', 401") of the bottle itself, which is connected externally with appropriate rounding to the contiguous side wall (701', 701"), is connected internally with the raised and arched bottom (301', 301") of the bottle itself, with an inclined edge (901', 901 ") whose generatrix forms an angle (±, ±', ±") between 90° and 40°, and between about 53° and 48° in particular, with the horizontal.

Description

Bottle made of plastic material with bottom reinforced.

The invention relates to a manufactured bottle in plastic material with a reinforced bottom, produced using the Blowing technique of an initial blank or "parisón" extruded or coextruded of high density polyethylene (HDPE) or other appropriate and particularly suitable material for the sterile packaging of liquids for food products, or for other uses where sterile packaging conditions are required, for example, for the packaging of liquids for cosmetic uses, Pharmacists or similar.

It is known as making these bottles, providing your bottom with a lowered and properly shaped concave with reinforcement ribs, in order to guarantee the deformability of the bottom of the bottle, both during the phase of manufacturing as in the phase of use, when the own bottle is loaded with the weight of the packaged product and is subjected to the vibrations and mechanical stresses that are generated during the various phases of transport: see the patent USA-A-3 403 804. In technology known problems have been seen with the tightness of the bottom of the bottles, due to the long-term appearance of small cracks in the area where said reinforcing nerves join the bottom of the bottle and problems have also been found deformation of the lower side part of the same bottle during the final phases of the thermoforming process of the bottle itself by blowing, as specified below. The The intention of the invention is to overcome these drawbacks of the known technology with the solutions indicated in the attached claims, whose characteristics and advantages will be made evident from the following description made by reference to the figures on the five pages of attached drawings, in which:

- Figure 1 is a side elevation view, of a bottle according to the invention;

- Figure 2 is a bottom plan view of the bottle in question;

- Figure 3 illustrates the background details of the bottle seen according to section (III-III) of the figure 2;

- Figure 3 shows, on a larger scale, one of the transverse nerves of the bottom of the bottle, surrounded by the circle indicated by (K1) in figure 3;

- Figure 4 illustrates other background details of the bottle, seen according to section (IV-IV) of the figure 2;

- Figure 4a shows, on a larger scale, one of the transverse nerves of the bottom of the bottle, surrounded by the circle indicated by (K2) in Figure 4;

- Figure 5 shows a side elevation of the part of the bottom of a bottle of the known type;

- Figure 6 shows the improved background and with a rounded plane of a container with a body with a section round, as in the solution of figure 2, or with a section polygonal and rounded as in the example in question;

- Figures 7 and 8 show details additional bottom of the container, as in figure 6, seen from agreement with the respective sections (VII-VII) and (VIII-VIII);

- Figure 9 shows the improved background and with a oval plane of a container with a body that also has a oval section;

- Figures 10 and 11 show details additional bottom of the container as in figure 9, seen from according to the respective sections (X-X) and (XI-XI).

The bottle (1), illustrated in Figure 1, has been manufactured using known thermoforming technology by blowing, starting from a parison of HDPE formed, by example, from several coextruded layers, arranged vertically with its own longitudinal axis, which in the phase proper is enclosed between two symmetric parts and complementary to a mold that defines the negative of the shape of the future bottle with its internal cavities and that, with its own means, close the opposite ends of the parisón with a closure complete bottom end intended to form the bottom of the bottle and with a partial closure of the upper end, to allow the passage of a needle connected to a circuit that, in the phase adequate, blows air under pressure in the parisón, forcing itself parisón to swell and adhere to the interior walls of the Two parts of the mold to adopt the established shape of the bottle (one). When, as in the case in question, the bottle is intended to sterile packaging of food products, cosmetics or another type, said blowing operation uses sterilized air. TO continuation of the training phase, the two parts of the mold, and the bottle still connected to the blowing needle It is usually tested for its tightness and to any other quality feature, and below is removed from the needle and transferred to the process of elimination of the lower wash residue. If the bottles have been blown using sterile air, only said air is removed from the blowing needle when its upper wash (101) has been crushed and hermetically sealed in the intermediate zone (101 '), and then having created a vacuum in the bottles themselves capable of compensating the future increase in pressure produced by the residual heat in the plastic material that constitutes the bottles themselves. Mouth The top of the bottles will be opened during the next phase of product filling, carried out in an environment with an atmosphere controlled. In this phase, the entire part is eliminated top of the bottle indicated in figure 1 by the line of strokes and by (101) and, after filling, the bottle is closed tightly with a screw cap, not shown in the drawings, threaded to the mouth (201) with external thread of the bottle itself. Be understand that the shape and dimensions of the bottle can be different from those illustrated in figure 1.

The bottles (1) in question have a bottom (301) with a slight recess and in the shape of a spherical cap, and said two parts of a mold that form the bottle have parts lower, each of which defines the shape of the fund (301) and that can scroll vertically compared to each one of the upper parts of the mold, with the logical consequence that these moving parts are generally raised in the phase Initial closure of the two parts of the mold. When has Once the bottle has been formed, the two parts are opened of the mold with a slight horizontal displacement separating each other, so that your moving parts of the fund remain freed from contact with the lower laundry and may descend to leave the notch formed by the bottom of the bottle, then of which said two parts of the mold complete the phase of opening to allow the extraction of the bottle.

During the bottle formation phase in said parts of the mold, linear ribs (2) are obtained in the bottom (301) of the bottle itself, embossed outwards (Figures 2 and 3), parallel to each other and arranged so symmetric, and being, for example, in number of five or in another number, preferably odd, such that one of these nerves is located in the center line of the bottom of the bottle and that these nerves are oriented perpendicularly in comparison with the ideal vertical plane on which the crushed part rests (101 ') of the upper wash (101) of the bottle and, for consequently, oriented with its longitudinal axis therein direction that the relative horizontal approach movement and separation of the two main parts of the mold between which The bottle has formed. The nerves (2) have a profile transverse and curved exterior (102), with a radius of curvature appropriate and the nerves themselves are connected to the lower face from the bottom (301) with a line (202) appropriately in the form of radius, as illustrated in detail in figure 3a, with the object to prevent such cracking phenomena from occurring during the cooling phase of the material of which they are composed. The nerves (2) have an intermediate section with substantially sides parallels and a substantially constant depth, and end with progressively tapered ends and with a depth decreasing, therefore with a pointed shape, located at the appropriate distance from the perimeter part (401) with which the Bottom of the bottle is intended to come into contact with a support surface.

During the same phase of formation of nerves (2), a nerve (3) is obtained perpendicular to the themselves and in the center line of the bottom of the bottle, which is adjacent and is aligned with the lower wash of the own bottle, and consists of a bottom (103) that is in contact with the bottom of the bottle and has a depth and a exterior width that are constant throughout its length and with about values that are equal to or slightly higher than those of intermediate sections of said nerves (2), and it crosses and is fixed to said nerves and exceeds the outer nerves (2), with short sections (103 '), as can be seen in the Figures 2 and 3. In said lower part (103), and throughout its length, the central nerve (3) comprises a central flange (203) of a limited width (A), for example, to a value of 1/3 approximately of the width (B) of the lower part (103) of the own nerve, which, seen laterally as in figure 3, It has a slightly arched profile that ends with a shape appropriate rounded at the equally rounded ends of the own lower part (103) of the central nerve. One of the functions of the flange (203) is to further strengthen the central nerve (3), while another important function is to disperse heat to ensure a fast and balanced cooling of both the nerve central (3) as of the nerves (2) perpendicular to it and structurally connected to each other.

From the detail of figure 4a you can it can be seen that the central nerve (3) has a section together substantially Y-shaped, and that is connected also at the bottom (301) of the bottle through its own part bottom (103), with an outside line (303) with a radius shape appropriate, which prevents the formation of cracks during the phase of cooling of the nerve itself (3). Connection areas (403) between part (103) and part (203) of the nerve (3) they also have appropriate radii, while the longitudinal edge (503) of the flange (203) is also appropriately rounded.

The number (4) in Figures 2, 3 and 4 indicates two small cavities sunk in the perimeter support edge of the Bottom of the bottle, aligned with the central nerve (3) mentioned previously and intended to cooperate with means that are appropriate to prevent rotation of the bottle itself during the phase in the which is closing at the top by means of the thread.

Figure 5 illustrates the bottom part of a bottle in which, according to a known construction technique, the perimeter support edge (401 ') of the bottom of the bottle itself It has a considerable width radially. This edge with a considerable width can be twisted down and lengthen the bottle in a permanent and anomalous way during the phase in which is closing and in which the void is being created in it, of so that the increase in the internal pressure itself is compensated produced by the residual heat of the thermoforming process by blown. This deformation is indicated by the dashed line. and also involves the side wall (501) of the bottle that is characterized by a large radius of curvature and a considerable height in the section included between said edge (401 ') and the first ribbed part (601) of the bottle side wall itself. Be It is intended that the invention overcome this drawback by means of solution illustrated in figures 1 to 4, according to which increases the curvature of the bottom (301) compared to the known technology, such that the width of the support edge (401) to a small part with a rounded profile and tangential to the side wall (701), which has a radius of curvature (R) smaller than that of known technology, and has a height that is also lower than that of known technology illustrated in figure 5 and ends in accordance with a part (801) of the side wall itself, which is veined by the corresponding step of widening downwards, all of which in such a way that the wall (701) realized in this way and connected to the parts (401) and (801) has a resistance to considerable torsion, both inward and outward of the bottle, completely solving these inconveniences of The known technology.

In the bottle as described, you can happen that in some conditions of use particularly extremes the area between the edge (401) and the ends of the nerves (2) and (3) can be twisted outward while the wall from the bottom (301) descends proportionally. it's possible solve this problem with an improved bottle, as will describe below with reference to figures 6 to 11. In bottles (1 ') with bottoms with a rounded plane, as in the example of figures 6, 7 and 8, the width of the support edge (401 ') is greater if compared to (401) of the solution above as in figures 1 to 3, and this to the detriment of the width of the recessed part of the bottom (301 '), which is affected by the reinforcing nerves (2) and (3), which may be less than (301) which provides the previous solution. The edge (401 ') has now radio shape, with a wide radius of curvature, with the profile of the lower side wall (701 ') of the bottle, while the inner end of the same edge (401 ') is connected so disjointed ("disjointed") to the spherical cover (301 ') at the bottom of the bottle, with a truncated cone-shaped edge (901 '), whose generatrix forms an angle (?) that measures less than 90º with with respect to the horizontal and which is preferably comprised between 40 and 60º, for example, about 48º.

The number (5) indicates the closed limit line between said edge (901 ') in the form of a truncated cone and the cover (301') at the bottom of the bottle, which in this example consists of a circumference. The reinforcing ribs (2) are located with their ends almost in contact with said circumference (5) and are distributed at a mutual distance greater than that of the solution above shown in figures 1 to 3, such that their ends (103 ') protruding from the diametral nerve (3) are also a short distance from said circumference (5). In the new solution discussed in this description, the distance of separation between nerves (2) is substantially equal to the value which is obtained by dividing the diameter of the circumference (5) by the number of the nerves themselves, so that the distance between the nerves (2) located more outside compared to the areas of the circumference (5) that are close to the recesses (4) is substantially equal to the separation between the nerves themselves (2).

The improvements described with reference to Figures 6 to 8 are valid for all bottles with bodies with a rounded section or with a regular polygonal section tending to a rounded section. In the case where the bottle section (1 ') is substantially square with rounded sides and corners, as in the example of figure 6, this same section is connected to the part of the bottom comprising the edge (401 '), with a part (10) with a square plane with corners and sides properly rounded, which is inscribed in the body section of the bottle (1 ') and is rotated 90º with respect to it.

When the bottom of the bottle (1 '') has a oval plane, as in the example of figures 9 to 11, the edge of bottom support (401 '') from the bottom of the bottle itself has a profile and an external connection to the lower side wall (701``) which are very similar to those of the previous solution to the one made reference in figures 1 to 3, but in this case the edge of support (401 '') is also connected internally to the wall (301 '') of the arch-shaped bottom, in this case with a plane oval, with an inclined edge (901``) whose generatrix in coincidence with the recesses (4) forms an angle (α ') of 45 ° at 50º approximately, for example, about 48º with the horizontal (figure 10), while coinciding with the nerve ends equatorial (2), the generatrix of the same edge (901 '') forms a angle (?) of approximately 50 ° to 55 °, for example, of about 53º (figure 11) with the horizontal.

Regarding the positioning of the nerves (2) and (3) compared to the boundary line (5) of the sloping edge (901 ''), what has been stated for the solution referred to in figures 6 to 8.

Claims (15)

1. Bottle made of plastic material with reinforced bottom, produced by blowing and particularly suitable for sterile packaging of liquid food products, cosmetics or other uses, characterized in that in the phase of formation of the bottle in the special parts of the mold, in the bottom (301) raised and in the form of a spherical cap of the same bottle, first linear ribs (2) are raised in relief towards the outside, parallel to each other, arranged symmetrically with a curved outer profile (102) and oriented perpendicularly in relation to the ideal vertical plane in which the crushed part (101 ') of the upper laundry (101) of the bottle is located, while at least one second rib (3) is obtained during the same formation phase ) as said first ribs (2), perpendicular to them, and, at least, in the center line of the bottom of the bottle, this second nerve being adjacent and aligned with l to lower casting of the bottle itself and being composed of a lower part (103) in contact with the bottom of the bottle, and crossing and being fixed to said first ribs (2) and exceeding with short end sections (103 ') a the outer ribs of said first ribs (2), and this second rib (3) comprising a lower part (103) in said length and along it, a central flange (203) with a limited thickness, with increasing functions of stiffness and heat dispersion. 2. Bottle according to claim 1) in the which said flange (203) of said second central rib (3) has a thickness with a value of approximately 1/3 of the width of the lower part (103) of the nerve itself (3). 3. Bottle according to claim 1) in the which said flange (203) of said second central rib (3) has a profile slightly curved laterally and concave towards the outside, with an appropriately rounded shape at its ends, which are also rounded at the bottom (103) of the own nerve (3). 4. Bottle according to claim 1) in the which said first parallel ribs (2) are, for example, in number of five or another number, preferably odd, of such so that one of them is located in the center line of the bottom Of the bottle. 5. Bottle according to claim 1) in the which said first parallel ribs (2) have a section intermediate with sides that are substantially parallel and with a substantially constant depth, and end with a few ends progressively conical with a decreasing depth, by consequently pointed, located at the correct distance of the perimeter part (401) with which the bottom of the bottle is intended to make contact with a support surface while that said second central nerve (3) has a lower part (103) with an outer depth and width with constant values, equal to or slightly larger than those in the intermediate sections of said first parallel nerves (2). 6. Bottle according to claim 1) in the which said first parallel ribs (2) have a curved profile which is connected to the bottom face (301) of the bottom of the bottle with a line (202) appropriately in the form of radius, and the part lower (103) of said second central nerve (3) also has an appropriately curved outer profile connected to the bottom of the bottle with a line (303) appropriately in the form of a radius, all in order to prevent the formation of cracks during the cooling phase of the nerves in question. 7. Bottle according to claim 1) in the which the connection zones (403) between the bottom part (103) and the flange (203) of said second central rib (3) have a radius appropriate, while the longitudinal edge (503) of said flange (203) is also appropriately rounded. 8. Bottle according to claim 1), characterized in that it has a bottom (301) with a wide radius of curvature, such that it reduces the width of the perimeter support edge (401) of the bottom itself to a small part with a profile rounded and tangential to the side wall (701) of the bottle, which has a radius of curvature (R) of a limited value, which also has a height of a limited value and ends up coinciding with a part (801) of the side wall itself, which is ribbed by the corresponding step that widens downwards, all in such a way that said wall (701) made in this way and connected to said parts (401, 801) has a considerable torsional resistance , both inside and outside the bottle. 9. Bottle according to one or more of the preceding claims, characterized in that the lower support edge (401 ', 401'') of the bottle itself, which is connected externally with an appropriate rounded profile to the adjacent side wall (701' , 701 ''), is connected internally to the raised and arched bottom (301 ', 301'') of the bottle itself, with an inclined edge (901', 901 '') whose generatrix forms an angle (? ,? ',?') between 90º and 40º with the horizontal. 10. Bottle, according to claim 9), characterized in that in bottles with bottoms (301, 301 ') with a rounded plane and with bodies with a section that is round or of regular polygonal shape tending round, the generatrix of said inclined edge (901 ') forms an angle (?) Between 40 ° and 60 ° with the horizontal, approximately 48 °, for example. 11. Bottle according to claim 10, characterized in that in the bottomed bottles (301, 301 ') with a rounded plane, the width of the bottom support edge (401') is greater compared to the (401) of the previous solution referred to in claims 1) to 8), and this to the detriment of the width of the lowered part of the bottom (301 ') that is affected by the reinforcing ribs (2, 3), which it may be less than that provided by said previous solution. 12. Bottle according to claim 10, characterized in that in bottles with bottoms (301, 301 ') with a rounded plane, the lower support edge (401') is provided with a radius with a wide radius of curvature with the profile from the bottom side wall (701 ') of the bottle itself. 13. Bottle according to claim 12), characterized in that if the section of the bottle itself (1 ') is substantially square with rounded sides and corners, this same section is connected to the part of the bottom comprising the edge (401') of support, with a part (10) that coincides with a square plane with rounded corners and sides in an appropriate manner, which is inscribed in the section of the body of the bottle (1 ') and is rotated 90 ° in comparison with it. 14. Bottle according to claim 9, characterized in that in bottles with bottoms (301 '') with an oval plane, the lower edge (401 '') of support is connected to said bottom wall (301 '') in shape of arc, with an inclined edge (901 '') whose generatrix, in coincidence with the recesses (4), forms an angle (?) of approximately 45º to 50º, approximately 48º, for example, with the horizontal, while they coincide with the ends of the equatorial nerve (2), the generatrix of the same edge (901 '') forming an angle (?) of about 50 ° to 55 °, approximately 53 °, for example, with the horizontal. 15. Bottle, according to one or more of the claims 9) to 14), wherein the closed line (5) of the limit between said inclined edge (901 ', 901' ') and the bottom recessed in arc shape (301 ', 301' ') of the bottle itself, contact substantially with the ends of the reinforcement rib series (2) that are distributed with a separation that is substantially equal to the value obtained by dividing the width of the space circumscribed by said closed line (5) in the direction perpendicular to said nerves, by the number of nerves themselves (2), all in a way that the ends (103 ') of the same that protrude from the diametral nerve (3) are also at a reduced distance of said closed line (5) of limit.