MXPA05008602A

MXPA05008602A - Container, method and apparatus for making the same.

Info

Publication number: MXPA05008602A
Application number: MXPA05008602A
Authority: MX
Inventors: Charles Jonathan Britton
Original assignee: Charles Jonathan Britton
Priority date: 2003-02-12
Filing date: 2004-02-12
Publication date: 2006-05-04
Also published as: CN1842408A; WO2004071745A1; GB2398267A; EP1601519A1; BRPI0407389A; CA2516099A1; US20060226158A1; GB2398267B; GB0303174D0

Abstract

A container (1) having a body and a rim (3) defining an opening for the container, the container being made of a material such as PET or PEN, is manufactured in a two-stage process. The first stage comprises injection moulding a preform (15) which has a rim (3) formed at its mouth and a continuous body-forming portion (32) extending across the preform from the inner periphery (19) of the rim, the rim having an outwardly-directed extent and including a downwardly-extending portion (21) spaced outwardly from the inner periphery and an outwardly-extending portion (5,6,29) located outwardly of the downwardly -extending portion. In the second stage the preform is placed in a moulding cavity (56) of a blow moulding apparatus (7) at an elevated temperature with the preform being located by means of the rim (3). The body-forming portion expands in the cavity to form the container side wall (20) and bottom wall (2). The upper region (18)of the side wall contacts the downwardly-extending portion (21) of the rim such as to form a box section (25). The side wall (20) has at its upper side region a step (23) above which the diameter of the cavity is substantially equal to or approaches the diameter of the downwardly-extending portion (21) of the rim. Below the step (23) the diameter is less than the diameter of the inner periphery of the rim and tapers therefrom inward downwardly to the bottom wall (2) at an acute angle, whereby the containers can internest.

Description

CONTAINER, METHOD AND MANUFACTURING DEVICE OF THE SAME BACKGROUND OF THE INVENTION The present invention is concerned with containers molded from plastic materials and with a method and apparatus for manufacturing such containers. The invention is particularly suitable for the manufacture of containers of the nature of cans or pots, preferably with caps from polyethylene terephthalate, although it is not limited to such manufacture. PET is particularly suitable for storing solvent-based content, but it is a difficult material to use in manufacturing. It has been appreciated that it would be desirable to produce PET containers that use a minimum of plastic material and are still strong enough for normal use, that occupy a minimum of space when empty, to transport them and are still easy to handle and use individually. When equipped with a lid, the containers should be easily stacked and easy to open. Such containers could be manufactured in a variety of sizes, particularly in the range of 250 ml to 5 liters or half pint to one gallon. The international patent application of the present inventors WO 97/98101 describes a method of manufacturing a container using a process of two Ref .: 166372 stages. In the first stage an embryo vessel is formed by injection molding. In this step, the rim is formed essentially completely, but the body is not yet formed and instead the walls of the embryo vessel take the form of a central tube extending inward from the inner periphery of the rim. Then the embryo container is transferred to a blow molding machine and the walls are expanded outward to form the body of the container. The international patent application of the present inventors WO 00/46118 describes a container with a more complex flange construction. Other proposals of the prior art for the manufacture of containers include the Japanese published patent application Sho-57-77439 (US patent 4,367,821 issued to Holt) and international patent application WO 99/28196 (US patent 2,271,158 issued to Koda).

BRIEF DESCRIPTION OF THE INVENTION The invention in its various aspects is defined in the independent claims hereinafter, to which reference can now be made. Advantageous aspects are summarized in the dependent claims.

Preferred embodiments of the invention are described in more detail below with reference to the figures. Preferred embodiments take the form of a container having a body and a rim defining an opening for the container, the container being made of a material that is susceptible to warping when heated. The container is manufactured in a two-stage process. The first step comprises injection molding in an injection molding apparatus of a preform, having a rim formed in its mouth and a continuous portion forming the body, which extends transversely to the preform, from the inner periphery of the rim, the flange has an outwardly directed extension and includes a downwardly extending portion spaced outwardly from the inner periphery and an outwardly extending portion located outwardly of the portion extending downward. In the second stage, the preform is placed in a molding cavity of a blow molding apparatus, at an elevated temperature, the preform is placed by means of the rim. The portion that forms the body expands in the cavity to form the side and bottom walls of the container. The upper region of the side wall is brought into contact with the portion extending down the flange, in such a manner as to form a box section. He The rest of the body forming portion comes into contact with the sides of the cavity to form the side and bottom walls of the container. In a first modality, the side wall has in its upper lateral region a narrowing lateral region, in the form of a tier, above which the diameter of the cavity is substantially equal to or approximates the diameter of the portion extending downwardly. of the flange. Below the tier, the diameter is smaller than the diameter of the inner periphery of the rim and tapers therein inwardly downward to the bottom wall, at an acute angle, whereby the containers can inter-splice. In a second embodiment, above the narrowing lateral region, the container is formed with outwardly extending ribs, the diameter of the container widens relatively rapidly in the region of the outer ribs to approximate the diameter of the extension towards down. The container is preferably provided with a lid that conforms to the top surface of the rim. The cap is sealingly engaged with the container flange and comprises two sealing elements, one on the upper part and the other on the flank or side of the portion of the cover that engages the flange. A fin can be provided on the flank of the lid to assist in the removal of the same.

BRIEF DESCRIPTION OF THE FIGURES The invention will now be described in more detail by way of example with reference to the figures, in which: Figure 1 is a side sectional view through a first container implementing the present invention; Figure 2 is a sectional detail through the rim of the container of Figure 1; Figure 3 shows three spliced containers, with the left part of the figure in section and the right side view; Figure 4 is a side sectional view through an injection molded preform used in the manufacture of the container of Figure 1; Figure 5 is a sectional view through an injection molding machine illustrating the manufacture of the preform; Figure 6 is a sectional view through an injection molding machine illustrating the initial step in forming the container from the preform; Figure 7 is a view similar to Figure 6 showing the end of the blow molding operation; Figure 8 is a sectional view similar to Figure 1 of the container of Figure 1, when equipped with a lid; Figure 9 is a sectional detail through the rim of the container and lid in Figure 8; Figure 10 is a sectional view of the lid; Figure 11 is a sectional detail of the lid rim; "Fig. 12 is a side sectional detail showing a sectional retainer having a fin extending downwardly; Fig. 13 is a side view of the fin region; Fig. 14 is a plan detail of the capped container that is shown in FIG. shows an optional rib; Figure 15 illustrates an alternative construction wherein the fin is received in a recess in the container wall; Figure 16 is a side view of a second container that complements the invention with a lid; a plan view of the lid of the container of Figure 16 and Figure 18 is a side sectional view through the container and lid of Figure 16.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES A first embodiment of the invention will now be described with reference to the figures. Figure 1 is a side sectional view through the finished container 1. The container is generally cylindrical in shape with sides 20 and a base 2. The base has a concave central portion to provide additional strength. The flange 3 of the container defining its mouth has, from its internal periphery 19, an inverted U-shaped section 4, then a V-shaped groove and finally an inverted V-shaped section 6. Thus, the rim is generally extends outwardly from the inner periphery 19. All of this is shown more clearly in Figure 2. The V-shaped slit, together with a downward extension 21 from the bottom of that slit forms a portion extending downwardly. . The upper region 22 of the side wall 20 of the container is brought into contact with this downward extension 21, to form a box section 25. This substantially increases the strength of the flange. Then, the inverted V-shaped section 6 further extends outwardly from the downward extension 21, culminating in a dependent rim 29. Approximately 15-20% of the side wall 20 of the container, is a step 26, in where the diameter of the side wall narrows abruptly. The side wall region 18 above the step is cylindrical and has a diameter that is substantially the same as the diameter of the downward extension 21. The side wall region 24 below the step is slightly smaller than the diameter of the periphery 19 of the flange and tapers from the harrow inward downward at an acute angle of 7 to 11 degrees. With this structure, the container shown in Figure 1 can be interconnected with a similar container. When it is spliced, as shown in Figure 3, the tier 23 of a container rests on the rim 3 of the container below. However, the containers are easy to separate. This arises because the flanges 29 extend apart from the side wall sections 18, allowing individual containers to be easily fastened and because the tier 23 is connected to the flange 3 of the container below and thus the containers are not they can be forced to a too strong coupling of their tapered parts. However, the containers are of relatively strong construction because of the thickness of the material that is used. The strength comes from the construction of the flange, which includes the box section 25 and the existence of the tier region 23 that gives resistance to the upper part of the side wall of the container.

The strength can be improved by the use of vertical reinforcing ribs. Commonly eight ribs 32 may be included, spaced equidistantly around the container. The presence of such ribs is indicated by the hatching in Figures 1 and 2. The ribs may be transverse to the box section 25 and / or fill the inverted V 6. The manufacturing method of the container of Figure 1 will now be described. The manufacturing method is based on that described in the international patent application of the present inventors WO 97/19801. The shape of the flange is an additional development of the flange described in the international patent application of the present inventors WO 00/46118. Both of these requests can be referred to for details and additional variations concerning the design. The first step in the method is to form a preform 15, as shown in Figure 4. The preform has the rim 3 in its final form, with the inner periphery 19, ü inverted 4, V-shaped slit 5, extension towards down 21, inverted V 6 and flange 29. Ribs 32, if present, are also formed at this time. The wall 20 of the container body is however not formed at this time, but instead, the preform includes a continuous element 32 that forms the disc-shaped or bowl-shaped body extending transversely to the preform from the inner periphery 19 of the rim, but which is reduced in size compared to its final shape. The shape of this element 32 can be any, from approaching a flat membrane to a substantially tubular shape. In the section shown in Figure 4, the shape adopted by the element 32 is approximately one arc of a third of a circle. The preform 15 is formed by injection molding in an injection molding machine 40, as illustrated in Figure 5. The injection molding machine has two main sections, ie a lower section formed by a cavity insert 22 and a top section formed by an internal preform bolt 44 and an external preform section 46. Neck divisions 48, carried by neck divider carrier plates 50, are also provided on the carrousel of the machine 52. The plastic material is injected through an injection hole 54 in the cavity insert 42 in the center of the bottom of the preform 15. The injection molding apparatus is well known and thus a detailed description of such an apparatus need not be given herein. However, it should be noted that the flange of the preform is fully formed in this operation and adopts the required shape in the final container. The portion 32 that forms the body of the The preform depends on the inner periphery of the flange. The preform is designed in such a way that a direct vertical movement of the central mold core (preform bolt 44 and section 46) will allow the removal of the mold preform. There are no guiding or sliding notches in the construction of either the core or the cavity. The use of injection molding allows the rim to be formed with high accuracy, which is necessary for good sealing of the lid. It should be noted that, in this description, it is assumed that the preform and eventual container are in a conventional orientation, that is, with the mouth at the top and the base at the bottom. The terms "upwards" and "downwards" and their derivatives must therefore be interpreted in this sense, although in reality the orientation of the preform or container may be different from this. The preform is now moved from the injection molding machine to a blow molding machine. A blow molding machine is a type of press molding machine; a less preferred alternative would be to employ a machine that uses suction instead of blowing. The preform is transferred to the blow molding machine 7, shown in Figure 6, while still hot and flexible. If it has cooled down, then it is reheated to be flexible. The blow molding machine 7 has a cavity 56 defined on the sides by two movable mold halves 11 and 12 and at the bottom by a movable base or tip 13. The upper part of the cavity is defined by a circular upper plate 8. which carries an axially movable vertical shaft 9. The rod 9 can be folded down to the open upper part of the preform 15, in such a way that it engages the sides 10 of the preform. ? As it descends it causes mechanical downward stretching of the vessel wall. The rod 9 has a center 58 which allows compressed air to travel to the cavity above the preform through angular holes 17 near the bottom of the rod. The shank 9 also has peripheral channels 60 which allow compressed air to enter the radial channels 16 that open in the upper part of the cavity near the upper part of the side wall 20 of the container. The flange 3 is held held in the blow mold. More particularly, the V-shaped groove and the inverted V-shaped groove 6 are supported by the mold halves, although in the case of the external groove 6 only partially. The remainder of the slit 6 is fitted to a continuous metal ring 14, divided in two, such that it can subsequently lift the finished molding from the blow mold 7. The metal ring 14 or neck divisions, are carried on carrier plates 64 neck. Thus, the sequence is that, first, the two halves of blow mold 11, 12 close around the flexible preform 15, at an elevated temperature and the metal ring 14. The upper circular plate 14 is folded down on the mold, which is brought into contact on the outer face of the internal U-shaped groove 4. Then the stretched stem 9 is lowered to force the material 32 that goes to form the walls of the container towards the base 13 of the mold cavity 56. Simultaneously, compressed air is introduced to the hollow center 58 and the channels 60 of the stretched shank 9. Emerges from both holes 16 in the upper part and in the angular holes 17 in the background. The holes 16 in the upper part are larger than those 17 in the bottom and also closer to the source of compressed air. This causes the plastic material in the upper part of the preform to move outward, until it comes into contact with the flank of the upper blow mold cavity, covering the base of the inverted U 4 as it does so. This thus forms the larger diameter portion 18, also as the box section 25, the latter is formed by the side wall of the container that abuts against the downward extension 21 to complete the box section shape. As the compressed air continues to blow, it also emerges from the holes 17 in the lower end of the shank 9 and now forms the remainder of the container by compressing the still softened plastic material of the hard preform against the metal sides of the blow mold. This continues to be aided by the mechanical reinforcement controlled by the stretched shank 9. The fully formed container in the blow molding machine is shown in Figure 7. The shape of the mold cavity 56 is in such a way as to impart the desired shape to the walls of the container 20. Thus, the cavity 56 has a narrow side wall section or tier 66, approximately one fifth or one sixth of the side wall. Above the step 66, the diameter of the cavity is approximately the same as the downward extension 21 of the rim 3 of the preform 15, when placed in the position of the mold cavity. Below the tier 66, the diameter is smaller than the diameter of the inner periphery 19 of the flange 3 of the preform, when it is located in position in the mold cavity. Further descending through the cavity, the cavity tapers well inward at an acute angle of 7 to 11 degrees, until it reaches the bottom wall of the cavity. Once the material has cooled and solidified, the blow mold is opened and the container is removed. The container is removed by the flange 3 and this can be facilitated by mold rings that form and mate with a guide notch 28 (see Figure 2) on the outer face of the flange 3, these rings are divided by themselves in two to free the product. The container 1 is preferably equipped with a lid 26, as shown in figures 8 and 9. The lid 26 is flat transversely to the main central part, but is formed in the region of its periphery to conform to the upper surface of the rim 3 of the container 1. For this purpose, the lid 26 first has a shoulder 70 which is formed on top of the U-shaped section 4, which now forms the box section 25 and then a wedge shape which it extends downwards 27, which engages with the V-shaped slit 5. However, due to the rigid nature of the material, the two interlocking tapers between the wedge shape 27 and the V-shaped slit 5 will not retain the closure or cover 26, which due to the radial compression force of the V-shaped groove, will gradually rise outwardly from the sealing faces. Thus, as shown in Figure 9, the lid 26 is retained on the container 1 by a downwardly extending flange 72 dependent on the periphery of the lid and conforms to the upper and outer faces of the rim in the region of the inverted V-shaped groove 6. The flange 72 thus fits around the flange 29. The flange 72 further carries a retainer in the form of an inward facing rib 74 on its inner face. This inward facing rib 74 engages guide groove 28, which was formed in the injection molding machine to form a coupling seal. The internal diameter of the outer rim of the lid 72 is smaller than the external diameter of the rim 29 just above the guide groove 28. The seal is thus provided by the combination of two sealing structures at a 90 degree angle to each other. , that is to say the wedge shape 27 and the V-shaped groove 5 on the one hand and the rib 74 and the guide groove 28 on the other hand. Sectional views of the lid alone are shown in Figures 10 and 11. In order to facilitate the release and removal of the lid, a flap 35 can be provided as shown in Figures 12 to 15. As best seen in FIG. 12, the flap extends downward from the periphery of the rim 72 at selected points identified by an external rib 37. The flap articulates at 36. The curved portion below the flap is accessed by inserting the user's finger underneath of the same and pull in an upward direction, at which point the fin becomes an articulated lever. Is prevented from traveling beyond 90 degrees to the container, this is up the horizontal, through the rib 37. The further upward movement of the flap 35 causes the outer rim 72 of the lid to detach from the underside of the rim 29 of the rim. This allows removal of the lid by peeling the flange 72 from the rim 29 of the container 1. Figure 13 shows a side view and Figure 14 a top view of the region of the fin 35. An alternative arrangement is shown in Figure 15 , wherein the fin or handle 35 is larger and has a portion 38 that fits in a recess 39 near the top of the container. The flap can be configured to have an "inviolable" membrane, which usually indicates that it has previously been used to open a container. The container of Figure 1 is formed with the box section 25 with the upper inner face providing structural strength and allowing large loop stresses to be developed between the wedge shape 27 and the V-shaped groove on the container. The resistance is further aided by the tier 23 and by the taper below the tier to the bottom of the container. The container can be inter-spliced as shown in Figure 3 illustrating three inter-spliced containers. Each container is seated with its tier 23 which sits on the upper surface of the flange 3 of the container that is under it. Thus, the outer part of the tapering section can not be wedged too firmly in the internal part of the tapering section of the container underneath it. The separation of the containers is further facilitated by the fact that the outer part of the rim extends outwardly from the wall of the container, making it easy for the user to retain two containers stacked adjacent to separate them. Thus, the advantageous aspects of proper strength, splicing ability and ease of separation, while using a minimum of plastic materials, are provided by the cooperating effects of the box structure that gives resistance to the ring and the tie and taper that they give resistance to the body, whereas the tier allows one recipient to lean on the rim of another. The ease of separation is assisted by the outwardly extending portion of the rim with its peripheral rim extending downward which facilitates manual gripping on the containers for separation. The container is preferably manufactured from polyethylene terephthalate (PET), for which the process is particularly appropriate. Other thermoplastic resins can however be used, which include polyethylene naphthalate (PEN) and also PET combinations and PEN, both in crystalline and amorphous structures of these two materials. Also, other rigid plastics which include polyvinyl chloride (PVC), polycarbonate, acrylic and several polyolefins which include polypropylene and high density polyethylene and low density polyethylene. In principle, any material susceptible to deformation when heated can be used, but the method is particularly advantageous with PET etc. The containers can be formed as buckets, buckets or cans and are particularly suitable for enclosing solvent-based content for storage for long periods without loss of solvent. They can in particular be used as cans for paints and other coating materials. The container itself is manufactured as an element without the need for welds, which are expensive and can be unreliable. The containers can be formed exactly from PET, which requires blow molding to give the biaxial stretching necessary for optimum strength. Despite a reasonably narrow taper, the containers can be spliced without jamming. Finally, the container can be sealed repeatedly and can still be opened again without the need for special tools. A second embodiment of the invention is illustrated in figures 16 to 18. This embodiment is similar to first modality and so only the differences will be described. In the second embodiment, the tier 23 and the upper section 18 of the side wall of the container of the first embodiment are replaced by a strongly tapering section 80 with external ribs 82. Thus, in the region of the ribs, the diameter of The vessel widens relatively quickly to approximate the diameter of the extension downwards. The external ribs have lower horizontal peripheries, such that, when they are spliced, the ribs settle on top of the rim of the container below, again preventing the apposition from appearing. In other aspects, the container is the same as the container of the first embodiment. Although preferred embodiments of the invention have been described and illustrated, as an example, many modifications can be made to the method, apparatus and containers described. It is noted that, with regard to this date, the best method known to the applicant, to carry out the aforementioned invention, is that which is clear from the present description of the invention.

Claims

CLAIMS Having described the invention as above, it is claimed as property, contained in the following claims: 1. A container having a body and a rim defining an opening for the container, the container is made of a material that is susceptible to deformation when heated, the container comprises: a rim formed in the mouth of the container, the rim has an outwardly directed extension and includes a downwardly extending portion spaced outward from the inner periphery and a portion extending outwardly , located outward from the portion that extends downward; a side wall and bottom wall of the container, the upper region of the side wall is brought into contact with the portion of the flange extending downward; characterized in that: the upper region of the side wall comes into contact with the downwardly extending portion of the rim, to form a box section, and the side wall of the vessel has in its upper side region a side wall section that is narrow, above which the diameter of the side wall is substantially equal to or approaches the diameter of the portion extending downwardly of the rim and below which the diameter is smaller than the diameter of the inner periphery of the rim and tapers therein inwardly to the bottom wall at an acute angle, whereby the containers can be inter-spliced. The container according to claim 1, characterized in that the container material comprises polyethylene terephthalate (PET), polyethylene naphthalate (PEN) or a combination of PET and PEN. 3. The recipient of. according to claim 1, characterized in that the rim has a portion extending outwards, radially beyond the portion extending downwardly. The container according to claim 3 characterized in that the outwardly extending portion has a peripheral rim to assist in the manual holding of the container, when it is spliced with another such container. The container according to claim 1, characterized in that the flange has a radially internal inverted ü-shaped section, then a V-shaped slit and finally an inverted V-shaped section. 6. The container in accordance with claim 5, characterized in that the downwardly extending portion extends downward from the V-shaped slit. 7. The container according to claim 1, characterized in that the acute angle is between 7 and 11 degrees. The container according to claim 1, characterized in that it further includes radially extending reinforcing ribs, spaced around the periphery of the container rim. The container according to claim 1, characterized in that the narrowing lateral section comprises a step, above which the side wall is of substantially constant diameter. The container according to claim 1, characterized in that, above the narrowing lateral region, the container is formed with external ribs extending outward, the diameter of the container widens relatively rapidly in the region of the containers. external ribs to approximate the diameter of the extension downwards. The container according to claim 1, characterized in that it also comprises a lid for the container, the lid conforms to the top surface of the flange. 12. The container according to claim 11, characterized in that the lid is sealingly engaged with the rim of the container and comprises two sealing elements, one on top of and the other on the side of the "" portion of the lid that is Coupling with the flange. 13. The container according to claim 11, characterized in that it includes a flap on the side of the lid to aid in the removal thereof. 14. A method of manufacturing a container having a body and a flange defining an opening for the container, the container is made of a material that is susceptible to deformation when heated, the method comprises the steps of: injection molding , in an injection molding apparatus, a preform having a flange formed in its mouth and a continuous portion forming the body, extending transversely to the preform, from the inner periphery of the flange, the flange has an extension outwardly directed and includes a downwardly extending portion, spaced outward from the inner periphery and an outwardly extending portion, located outwardly from the portion extending downwardly.; placing the preform in a mold cavity of a pressurized molding apparatus at an elevated temperature, with the preform being positioned by means of the flange and moving the portion forming the body, in the press-molding apparatus, downwards and outwards, whereby the portion that forms the body expands in the cavity, to form them. side and bottom walls of the container, the upper region of the side wall is brought into contact with the downwardly extending portion of the rim and the remainder of the body-forming portion is brought into contact with the sides of the cavity so as to forming a shape defined by the interior shape of the cavity; characterized in that: the upper region of the side wall is brought into contact with the downwardly extending portion of the flange, in such a way as to form a box section and the inside of the molding cavity, of the press molding apparatus is formed to define the side and bottom walls of the container, the cavity has in its upper lateral region a narrowing side wall section, above which the diameter of the cavity is substantially equal to or approximates the diameter of the portion extending downwardly of the flange and below which the diameter is smaller than the diameter of the inner periphery of the flange and tapering therefrom inwardly downwardly to the bottom wall at an acute angle, whereby the resulting containers they can inter-splice. 15. The method according to claim 14, characterized in that the container material comprises polyethylene terephthalate (PET), polyethylene naphthalate (PEN) or a combination of PET and PEN. The method according to claim 14, characterized in that the step of injection molding forms the rim with a portion extending outwardly, radially beyond the portion extending downwardly. The method according to claim 16, characterized in that the outwardly extending portion has a peripheral rim to assist in the manual holding of the container, when it is spliced with another such container. 18. The method according to claim 14, characterized in that the step of injection molding forms the rim with an inverted U-shaped section radially internal, then a V-shaped slit and finally a section, inverted V-shaped. . The method according to claim 18, characterized in that the downwardly extending portion extends downwardly from the v-shaped slit. 20. The method according to claim 14, characterized in that the acute angle is between 7 and 11 degrees . The method according to claim 14, characterized in that it further includes radially extending reinforcing ribs, spaced around the periphery of the container rim. The method according to claim 14, characterized in that the cavity of the pressure molding apparatus is formed in such a way that the narrowing lateral region comprises a tier, above which the cavity is of substantially constant diameter. 23. The method according to claim 14, characterized in that the cavity of the pressure molding apparatus is formed such that, above the narrowing lateral region, the container is formed with external ribs extending outwardly. , the diameter of the container widens relatively rapidly in the region of the external ribs to approach the diameter of the extension downwards. 24. The method according to claim 14, characterized in that the pressure molding apparatus is a blow molding apparatus. 25. The method according to claim 14, characterized in that the step of moving the portion that forms the body is aided by mechanical stretching of the portion that forms the body, in the apparatus of pressure molding. 26. The method according to claim 14, characterized in that it further comprises the step of providing a lid for the container, the lid conforms to the upper surface of the rim. 27. The method according to claim 26, characterized in that the lid is sealingly engaged with the rim of the container and comprises two sealing elements, one on the top and the other on the side of the portion of the lid that is Coupling with the flange. 28. The method according to claim 26, characterized in that it includes a flap on the side of the lid to assist in the removal thereof. 29. An apparatus for manufacturing a container having a body and a rim defining an opening for the container, the container is made of a material that is susceptible to deformation when heated, the apparatus comprises: a molding apparatus for injection, adapted to injection molding a preform, which has a flange formed in its mouth and a continuous portion forming the body, which extends transversely to the preform, from the inner periphery of the flange, the flange has an extension directed outward and includes a portion that extends downwards, spaced outwardly from the inner periphery and a portion extending outward, located outwardly from the portion extending downward; a press molding apparatus having a molding cavity; means for placing the preform in the molding cavity of the press molding apparatus at an elevated temperature, the preform is positioned by means of the rim and means, in the press molding apparatus, to move the portion forming the body towards downward and outward, whereby the portion forming the body expands in the cavity, to form the side and bottom walls of the container, the upper region of the side wall is brought into contact with the portion extending downwardly. of the flange and the rest of the portion forming the body comes into contact with the sides of the cavity to form a shape defined by the interior shape of the cavity; characterized in that: the cavity is formed in such a way that the upper region of the side wall comes into contact with the portion extending downwardly of the rim, in such a manner as to form a box section and the interior of the cavity, in the molding apparatus under pressure is formed to define the side and bottom walls of the container, the cavity has in its upper side region, a narrowing side wall section, above which the diameter of the cavity is substantially equal to or approaching the diameter of the portion extending downwardly of the flange and below which the diameter is smaller than the diameter of the inner periphery of the flange and tapers therein inwardly downwardly to the bottom wall at an acute angle, thereby which containers formed by the apparatus can be interconnected. 30. The apparatus in accordance with the claim 29, characterized in that the injection molding apparatus forms the rim with an outwardly extending portion, radially beyond the downwardly extending portion. 31. The apparatus in accordance with the claim 30, characterized in that the outwardly extending portion has a peripheral rim to assist in the manual holding of the container, when it is spliced with another such container. 32. The apparatus according to claim 29, characterized in that the injection molding apparatus forms the rim with an inverted U-shaped section radially internal, then a V-shaped slit and finally an inverted V-shaped section. 33. The apparatus according to claim 32, characterized in that the downwardly extending portion extends downwardly from the V-shaped slit. 34. The apparatus according to claim 29, characterized in that the acute angle is between 7 and 11 degrees. 35. The apparatus according to claim 29, characterized in that the injection molding apparatus is further formed to form radially extending reinforcing ribs, spaced around the periphery of the container rim. 36. The apparatus according to claim 29, characterized in that the cavity of the pressure molding apparatus is formed in such a manner that the narrowing lateral region comprises a tier, above which the cavity is of substantially constant diameter. 37. The apparatus according to claim 29, characterized in that the cavity of the pressure molding apparatus is formed in such a way that, above the narrowing lateral region, the container is formed with external ribs extending outwardly. , the diameter of the vessel widens relatively quickly in the region of the outer ribs to approximate the diameter of the extension down. 38. The apparatus according to claim 29, characterized in that the pressure molding apparatus is a blow molding apparatus. 39. The apparatus in accordance with the claim 29, characterized in that the pressure molding apparatus includes means for mechanically stretching the portion forming the body. 40. The apparatus according to claim 29, characterized in that it also comprises means for forming a lid for the container, the lid conforms to the upper surface of the rim. 41. Apparatus according to claim 20, characterized in that the lid is sealingly engaged with the rim of the container and comprises two sealing elements, one on the and the other on the side of the portion of the lid that engages with the flange. 42. The apparatus according to claim 40, characterized in that it includes a flap on the side of the lid to assist in the removal thereof. 43. A container characterized in that it is manufactured using the method according to claim 14. SUMMARY OF INVENTION A container (1) having a body and a flange (3) defining an opening for the container is described, the container is made of a material such as PET or PEN, is manufactured in a process of two stages. The first step comprises injection molding a preform (15) having a flange (3) formed in its mouth and a continuous portion (32) forming the body, extending transversely to the preform, from the inner periphery (19) of the rim, the rim has an outwardly directed extension and includes a downwardly extending portion (21) spaced outwardly from the inner periphery and an outwardly extending portion (5, 6, 29). ) located away from the portion that extends downward. In the second stage, the preform is placed in a molding cavity (56) of a blow molding apparatus (7) at an elevated temperature, the preform is placed by means of the flange (3). The portion that forms the body expands in the cavity to form the side wall (20) and bottom wall (2) of the container. The upper region (18) of the side wall comes into contact with the downwardly extending portion (21) of the flange, so as to form a box section (25). The side wall (20) has in its upper lateral region a tier (23) above which the diameter of the cavity is substantially equal to or approximates the diameter of the portion which extends downwards (21) from the flange. Below the tier 23 the diameter is smaller than the diameter of the inner periphery of the rim and tapers therein inwardly and downwardly to the bottom wall 2 at an acute angle, whereby the containers they can inter-splice.