FR2772730A1 - DEVICE FOR PACKAGING AND TRANSPORTING LIQUID OR POWDER PRODUCTS - Google Patents

Abstract

The invention relates to a device for packaging and transporting liquid or powdered products of the type comprising, on the one hand, an internal container (1) intended to contain said product and provided with an evacuation orifice (10). closable and, on the other hand, a rigid outer shell (2) enclosing said container (1), characterized in that said shell (2) consists of two parts (21, 22) assembled in a removable manner and lockable in view respectively to allow the extraction of the container (1) and to ensure its protection; one of the two parts (21) being provided with a recess (20) intended to cooperate with the orifice (10) of the container (1) to allow the distribution of the product.

Description

The present invention relates to a device for

  packaging and transport of liquid or powder products.

  More precisely, the invention applies to classified products

  hazardous substances by the regulations in force.

  The packaging intended for the transport of these dangerous products requires special approvals, which most often impose very strict physical properties with, in particular, severe requirements as regards mechanical strength and resistance to chemical attack. These packaging are only very rarely recovered or recycled

  due to their contamination by the packaged products.

  The packaging, transport and sale of these dangerous products are currently carried out either in waste packaging, therefore involving the landfilling of large quantities of plastics, or in packaging called shuttles (jerry cans or drums) requiring systematic washing before brand new packaging. However, this preliminary washing is incompatible with certain products such as those based on hydrocarbons, unless 100% perfect drying is guaranteed, which

  makes recycling operations complex and expensive.

  Large-capacity packaging (greater than 10 liters) is also present on the consumer product market. However, they do not follow any particular treatment in the chain of

waste recovery.

  The aim of the present invention is to solve the technical problems linked to the prior art by notably reducing the quantities

  of plastics landfilled.

  This object is achieved according to the invention by means of a device for packaging and transporting liquid or powder products of the type comprising, on the one hand, an internal container intended to contain said product and provided with an orifice. closable evacuation and, on the other hand, a rigid external shell containing said container, characterized in that said shell consists of two parts assembled in a removable and lockable manner in order respectively to allow the extraction of the container and to ensure its protection; one of the two parts being provided with a recess intended to cooperate with

  the orifice of the container to allow the distribution of the product.

  According to an advantageous characteristic, the external shape of said container at least partially matches the internal shape of said shell so as to avoid, after assembly of the two parts,

  relative movement of the container and the shell.

  According to another characteristic, said container is provided with a rigid neck at the end of which is formed the discharge orifice, and which

  protrudes outside through the hull recess.

  Preferably, said neck comprises a ring intended to be inserted into the recess of the shell and the lateral periphery of which is provided with at least one facet coming into contact with an edge of the recess whose complementary profile makes it possible to ensure the blocking

in rotation of said neck.

  According to a particular embodiment, said neck comprises a collar provided with an axial retaining face coming to bear externally on the edge of the recess of said shell for

  keep the container neck outside.

  According to a first variant, said axial retaining face is carried by at least one radial fin flexible downwards and integral with

  the periphery of said collar.

  Preferably, said retaining face is carried by four

  two-by-two diametrically opposite radial fins.

  According to another variant, said retaining face is carried by an elastically deformable torus mounted around the neck between the collar and

the ring.

  According to yet another characteristic, the two parts are assembled in a removable and lockable manner by means of a connection system produced on at least two opposite faces of the parts of the shell and comprising an axis intended to be engaged in aligned sections of duct formed, parallel to the joint plane, at the ends of at least two teeth carried respectively by the edges

  joined of each of said parts.

  According to a first variant, the end edge of said teeth carries lugs intended to be introduced into cavities

  complementary made on the joined edge of the opposite part.

  According to a second variant, the ends of said teeth where said conduit is formed are made with an extra thickness of the interior wall. According to a third variant, the connection system comprises three teeth, two of which are carried by the contiguous edge of one of the parts, being separated by a cutout in which the

  third tooth carried by the joined edge of the other part.

  Preferably, the longitudinal ends of the duct of the connection system are provided with an eyelet to facilitate the introduction and the extraction of the axis engaged with radial tightening in

said housing.

  According to a preferred embodiment, the two parts of the shell are joined in a joint plane which is substantially parallel to the base plane of said shell, thereby defining a part

  upper and lower part.

  According to other characteristics, the contiguous edges facing said parts comprise on at least one face of the shell,

complementary slots.

  Furthermore, the vertical section of the shell wall at the contiguous edges facing said parts is made, at least locally, of tenons and / or mortises ensuring an assembly

flush with said parts.

  Preferably, the inner flank of the studs is higher than the

outer flank.

  According to one embodiment, the upper face of the shell

has at least one handle.

  According to a specific variant, the upper face of the shell is provided with three handles, the central handle being offset from

to the two side handles.

  According to another variant, the underside of the shell comprises, for stacking, at least two oblong cavities and an at least partially cylindrical cavity adapted to receive respectively the handles and the neck of the container of a device of the

same type.

  According to yet another variant, the underside of the shell has a cavity opening onto one of the lateral faces and intended for manual gripping, in particular in order to facilitate emptying of the container. According to a particular embodiment, the container has an upper face inclined downward from the discharge orifice and coming to lean against an internal wedging surface integral with one

parts of the hull.

  According to a first variant, said internal wedging surface is carried by a partition substantially parallel to the upper face of the container. According to a second variant, said internal wedging surface is

  materialized by the ends of vertical ribs.

  According to a third variant, said internal wedging surface is carried by a box produced by molding or possibly added

as an insert.

  An advantageous arrangement consists in that one of the lateral faces of the shell is provided with at least one light making it possible to

  view the level of the product in the container.

  According to a preferred embodiment, the body of said container is made of a flexible plastic material with a deformable wall of small thickness while its neck is stiffened by a

  greater wall thickness.

  The device of the invention consists of two main elements consisting respectively of a disposable light container which is easily and economically recyclable and a protective shell

  rigid, immediately reusable and without special treatment.

  The container can be filled by the neck with the product to be packaged, being already placed in the shell, the two parts being

previously assembled.

  The empty container is extracted from the shell by releasing the locking device to at least partially separate the two parts and

  clear enough space for its passage.

  The shell provides physical protection for the container by offering mechanical resistance to external aggressions or stresses (shocks, wear from friction, UV). Good resistance of the shell is obtained by the use of appropriate plastics $ as well as by the possible production of reinforcement ribs

most exposed places.

  The container has thinned walls and is flexible enough to be substantially deformable. It ensures, in addition to its function of container, a double chemical protection, by preserving, on the one hand, the product of any deterioration and by isolating it, on the other hand, from the external packaging formed by the shell. So the packaging is reusable without

  risk of contamination and may undergo recycling at end of life.

  The shell forms a protective envelope consisting of two at least partially separable parts which are assembled by means

  a locking connection system possibly forming a hinge.

  The complete separation of the two parts involves the extraction of the pin-forming axis using specific tools. So this envelope

  cannot be opened by the ordinary consumer.

  Indeed, the axis has a diameter slightly greater than the inside diameter of the conduit, which ensures a retention by radial tightening. In these conditions, a significant effort is necessary to

  insert and remove the axle from its housing.

  In addition, to minimize the risk of buckling at the connection between the two parts of the hull, small pins

  ensure cohesion between the parts constituting the hinge.

  The neck of the container has a ring intended to be inserted into the recess of the shell, and which is provided with at least one planar facet forming an anti-rotation blocking means during the operations of

  screwing and unscrewing the shutter member of the discharge orifice.

  The contours of this ring are therefore adapted to those of

  the recess which preferably define a parallelogram.

  The container neck is held through the recess and outside the shell by means of an axial retaining face, the

  larger dimension is greater than the diameter of the recess.

  This face is carried by an element capable of deforming elastically or of being retracted by bending in one direction for

  allow the passage and the establishment of the neck in the recess.

  The mounting of the neck is facilitated when on the edge of the recess, the wall of the shell is also made flexible by being

  thinned or presenting a beveled profile.

  The device of the invention can be used in a mode of packaging and transport by shuttles, that is to say by recovering the shell once rid of the empty container which is discarded or recycled, and by returning it to the sender for a new use. The shell is thus reusable for a period of approximately five years, at the end of which it can be easily recycled because its material

  constitutive has never been in contact with the products.

  The light container has a lower cost than traditional containers which are more rigid and which are therefore necessarily manufactured with larger quantities of material. The original shape and structure of the device of the invention make it particularly ergonomic and allow a

  stable stacking on several levels.

  In addition, the handling and emptying of the device can

  be performed by one person.

  Finally, the wedging of the internal container is particularly effective and avoids any risk of relative displacement between the container and the shell.

  whatever the movements and the position of the device.

  The invention will be better understood on reading the description

  which follows, accompanied by the drawings in which: - Figure 1 is an exploded elevation view of an embodiment of the device of the invention; - Figures 2a and 2b show respectively front and side views of the container used in the device of the invention; - Figures 3a, 3b, 3c, 3d and 3e show respectively front, side, back, top and bottom views of an embodiment of the device of the invention with the container enclosed in the shell; - Figures 4a and 4b respectively show side and top views of a first embodiment of the container neck according to the invention; - Figures Sa and 5b respectively show side and top views of a second embodiment of the container neck according to the invention; - Figures 6a and 6b show perspective views respectively in exploded view and in the assembly position of the connection system used to assemble the two parts of the shell of the device of the invention; - Figure 7 shows a sectional view along line AA of Figure 3c, of an alternative embodiment of the device of the invention; - Figures 8a, 8b, 8c and 8d show views in partial section of different variants of arrangement of the timing means

the upper part of the container.

  The device of the invention which is represented in the figures, is intended for the packaging and the transport of liquid or powder products and, more particularly, of products considered as dangerous and requiring a very protective packaging vis-à-vis

  possible chemical or mechanical attack.

  The embodiment of this device illustrated in FIG. 1 comprises, on the one hand, an internal container 1 intended to contain the product

  and, on the other hand, a rigid external shell 2 containing the container 1.

  The container 1 is provided with a closable discharge orifice 10,

  for example, by means of a threaded plug 3.

  The shell 2 consists of two complementary parts 21, 22 assembled in a removable and lockable manner in order, respectively, to allow the extraction of the container after emptying and

  ensure its protection during transport and storage.

  One of the parts 21 of the shell 2 is provided with a recess intended to cooperate with the orifice 10 of the container 1 to allow the

product distribution.

  The container 1 has an external shape in the form of a pyramid trunk facilitating the total emptying of the container, shown in FIGS. 2a and 2b which follows the internal shape of the shell 2 so as to avoid any displacement after assembly of the two parts 21, 22 relative container

1 and hull 2.

  The container 1 is provided with a rigid neck 11, possibly

  threaded, at the end of which is the discharge orifice 10.

  The neck 11 is intended to protrude outside through

  the recess 20 formed here in the upper part 21.

  The container 1 is produced by extrusion-blowing in a flexible plastic material (for example HDPE) possibly transparent. The body 12 of the container has a deformable wall, of small thickness

  while the neck is stiffened by a greater wall thickness.

  Figures 3a to 3e show the device of the invention after closing the shell 2 with the container 1 trapped between the two

parts 21.22.

  The two parts 21, 22 of the shell 2 are produced by injection molding of a plastic material (HDPE, polypropylene, etc.). They are joined here in a joint plane substantially parallel to the base plane of the shell, thus defining a so-called upper part 21 forming

  cover and a so-called lower part 22 forming a base.

  The upper face 2a of the shell 2 comprises gripping means consisting of at least one handle, and preferably three

handles 213a, 213b, 213c.

  The central handle 213b, which is used for handling by a single person, is offset backwards with respect to the two lateral handles 213a, 213c which are used for handling by two people. The recess 20 of the shell 2 is produced here on the upper face 2a in a frontal zone 21a situated here in depression relative to the

rear area level 21b.

  The handles consist of a central groove 230 bordered by two lateral flanks 231 and stiffened by transverse partitions 230a. The upper side can include a storage space for various tools such as a pouring spout or a funnel (see variant

in Figure 8d).

  One of the side faces of the shell 2, and preferably the front side face 2b, is provided with at least one light 220 making it possible to view the level of the product in the internal container 1 while one of the adjacent faces carries a identification marking (banner, label ...) fixed in a constriction 222 formed around the perimeter

  side of part 22 (see Figures 3a and 3c).

  The underside 2c of the shell 2, shown in FIG. 3e, comprises, for stacking, oblong cavities 223a, 223b, 223c adapted in number, in profile and in dimensions to receive the

  handles 213a, 213b, 213c of an identical device.

  The lower face 2c also includes a cavity 25 at least partially cylindrical, adapted to receive the neck 11 of the container 1 with its closure member 3, as well as another cavity 26

  opening onto the rear side face 2d.

  The cavity 26 is adapted and intended for manual gripping of the shell 2 with a view in particular to enabling it to tilt and to perform

thus emptying the container 1.

  In the variant embodiment shown in FIG. 3e, the cavity 223b communicates with the cavity 26 and the cavity 25 opens onto

the front lateral face 2b.

  All the cavities formed on the lower face 2c of the shell are also in the form of cavities 13 on the lower face lc of the container 1 with the same positions and substantially identical dimensions (see FIGS. 2a and 2b) so as to obtain by fitting

  immobilization and setting of the container 1 on the bottom of the shell 2.

  The cavities are made both on the shell 2 and on the container 1, with a slight flare so as to facilitate nesting under the effect of the load of the container 1, as shown in dotted lines on the

Figures 3a to 3e.

  The neck 11 of the container projects outside the shell 2, through the recess 20 which is produced in the bottom plane 21a of the face

upper part 2a of part 21.

  Generally, the recess 20 is provided with at least one rectilinear edge 20a intended to cooperate with locking means in

cervical rotation 11.

  These means comprise at least one facet 112a produced on the lateral periphery of a ring 112 carried by the lower part of the neck

  11 of the container 1 and intended to be inserted into the recess 20.

  In the embodiment shown in FIGS. 4a, 4b, Sa and 5b, the ring 112 and the recess 20 are produced in the form of

  parallelograms which are squares here.

  The contact between the facet 112a and the edge 20a prohibits any

  rotation of the neck 11 in the recess 20.

  The neck 11 further comprises a flange 110 produced

above the ring 112.

  The flange 110 is provided with a face 110a ensuring the axial retention of the neck by external support on the rim 20b of the recess 20 and

  thus prohibiting any depression of the neck 11 in the shell 2.

  In the first variant, shown in FIGS. 4a and 4b, the retaining face 110a is carried by at least one and, preferably, by three or four radial fins 111. The fins 111 are integral with the

  periphery of the collar 110 and diametrically opposite two by two.

  The fins 111 are flexible only downwards, which allows the passage of the neck 11 upwards, through the recess 20 from the inside of the part 21 of the shell 2, and prevents the return of the neck 11 to

inside the hull.

  In the second variant shown in FIGS. 5a and 5b, the retaining face 110a is carried by an elastically deformable torus 30, mounted under slight tension around the neck 11 in the constriction

  located between the collar 110 and the ring 112.

  The torus 30 projects laterally beyond the ring 112 and thus forms a spacer which abuts on the outer edge 20b

  of the recess 20, under the effect of an axial thrust.

  The two parts 21, 22 of the shell 2 are assembled in a removable and lockable manner by means of a connection system, the

  principle is illustrated by Figures 6a and 6b.

  In these figures are represented wall fragments of

  upper 21 and lower 22 parts of the shell 2 to be assembled.

  The connection system comprises a pin 4 forming a pin, intended to be engaged with radial tightening in the sections of a conduit 24 parallel to the joint plane of the two parts 21, 22. Axis 4 is completed,

  preferably in a plastic material.

  The sections 24a, 24b, 24c of conduit are formed in the ends of at least two, and here of three teeth 214a, 214b, 224, carried

  respectively by the contiguous edges of each of the parts 21,22.

  In the embodiment shown, the lower edge of the upper part 21 carries two teeth 214a, 214b separated by a cutout 212 in which is housed the third tooth 224 secured to the upper edge of the lower part 22 so that the three

  sections 24a, 24b, 24c of the conduit 24 are aligned.

  To strengthen the contiguous edges and facilitate the production of the conduit 24, the ends of the teeth 214a, 214b, 224 are produced with

  an extra thickness of the inner wall of the shell 2.

  The container 1 then has a groove 14 extending on its outer lateral wall and intended to receive the extra thickness of the teeth 214a, 214b, 224 of the connection system, which ensures a wedging

  additional (see Figures 2a and 2b).

  The end edge of the teeth 214a, 214b, 224 carries lugs 211,221 intended to be introduced into complementary cavities

  220,210 made on the contiguous edge of the facing part.

  The cooperation between the pins 211, 221 and the cavities 220, 210 strengthens the mechanical strength of the wall of the shell 2 (in particular by reducing, in the event of heavy stacking, the risks of buckling) and

  guarantees the outcrop of the two parts 21, 22 after assembly.

  Figure 6b shows the wall fragments of the parts

  upper 21 and lower 22 after assembly.

  The assembly of the two parts 21, 22 is implemented by means of the connection system of the type described above, preferably carried out on

  at least two opposite lateral faces of the shell 2.

  The introduction of the container 1 into the lower part 22 of the shell 2 as well as its extraction can be carried out by releasing the connection system only on one of these faces. The complementary connection system then plays the role of hinge. On at least one of the other lateral faces of the shell 2 which are not provided with a connection system, the contiguous edges opposite the two parts 21,, 22 have complementary slots 215,225 as shown

in Figure 3c.

  On these lateral faces, the vertical section of the wall of the shell 2, at the contiguous edges facing the parts 21, 22, is made up, at least locally, of studs 216 and mortises 226

  to ensure a flush and rigid assembly of said parts.

  As shown in section AA in FIG. 7, the tenons 216 are preferably made on the lower edge of the upper part 21 while the mortises 226 are made on the upper edge of the

lower part 22.

  The inner flank 216a of the studs 216 is here higher than the

outer flank 216b.

  Figures 8a to 8d show different variants of

  realization of the upper part 21 of the shell 2.

  The container 1 preferably has the shape of a pyramid trunk with an upper face inclined downwards from the orifice

  outlet 10 to allow complete emptying.

  However, since the upper face 2a of the shell 2 is made up of two substantially horizontal planes 21a, 21b, an internal wedging surface is provided against which the face is supported.

the top of the container.

  In the variant of FIG. 8a, the internal surface is carried by a partition 217 substantially parallel to the upper face 1a of the container. The partition 217 is fixed for example to the internal side wall

  of the upper part 21 of the shell 2.

  In the variant of FIG. 8b, the internal surface is carried by the lower face of a box 218 produced by molding inside the upper part 21, or in the form of an insert inserted and fixed under the

side 2a.

  The box 218 is hollow or of expanded material.

  In the variant of FIG. 8c, the internal wedging surface is materialized by the ends of partitions or vertical ribs 219 fixed on the internal lateral wall and / or under the upper face 2a of the

part 21 of the hull 2.

  In another variant shown in FIG. 8d, the internal surface is carried by an inclined central zone 21c of the upper face 2a of the shell 2 delimiting, between the front plane 21a and the rear plane 21b located here at the same level, a housing for tools

or accessories.

  By way of nonlimiting example, the dimensions of an embodiment of the device of the invention are for a container of 20 liters: height of the hull: 470 cm length of the hull: 280 cm width of the hull: 240 cm average thickness of the shell wall: 3 mm average thickness of the container wall: 0.5 mm

Claims (27)

  1. Device for packaging and transporting liquid or powder products of the type comprising, on the one hand, an internal container (1) intended to contain said product and provided with a closable discharge orifice (10) and, on the other hand, a rigid outer shell (2) containing said container (1), characterized in that said shell (2) consists of two parts (21,22) assembled in a removable and lockable manner in order respectively to allow the extraction of the container (1) and ensuring its protection; one of the two parts (21) being provided with a recess (20) intended to cooperate with the orifice (10) of the container (1) for   allow the distribution of the product.   2. Device according to claim 1, characterized in that the external shape of said container (1) at least partially matches the internal shape of said shell (2) so as to avoid, after assembly of the two parts, any relative displacement of the container (1) and some shell (2).   3. Device according to claim 1 or 2, characterized in that said container (1) is provided with a rigid neck (11) at the end of which is formed the discharge orifice (10), and which projects at   the exterior through the recess (20) of the shell (2).   4. Device according to claim 3, characterized in that said neck (11) comprises a ring (112) intended to be inserted in the recess (20) of the shell (2) and the lateral periphery of which is provided with less a facet (112a) coming into contact with an edge (20a) of the recess, the complementary profile of which ensures blocking in rotation of said neck (11).   5. Device according to claim 3 or 4, characterized in that said neck (11) comprises a flange (110) provided with an axial retaining face (11Oa) coming to bear externally on the flange (20b) of the recess (20) of said shell (2) to maintain the neck (11) of the container (1) outside.   6. Device according to claim 5, characterized in that said face (1 O10a) of axial retention is carried by at least one flexible radial fin (111) downwards, integral with the periphery of said flange (110).   7. Device according to claim 6, characterized in that said retaining face is carried by four radial fins (111) diametrically opposite two by two. 8. Device according to claim 5, characterized in that said retaining face (110a) is carried by a toroid (30) elastically deformable mounted around the neck (11) between the flange (110) and the ring (112).   9. Device according to one of the preceding claims,   characterized in that the two parts (21, 22) of the shell (2) are assembled in a removable and lockable manner by means of a connection system produced on at least two opposite faces of said parts and comprising an axis (4) intended to be engaged in aligned sections (24a, 24b, 24c) of conduit (24) formed, parallel to the joint plane, at the ends of at least two teeth (214a, 214b, 224) carried respectively by the contiguous edges of each of said parties (21.22).   10. Device according to claim 9, characterized in that the end edge of said teeth (214a, 214b, 224) carries lugs (211, 221) intended to be introduced into complementary cavities   (220,210) made on the contiguous edge of the facing part.   11. Device according to claim 9 or 10, characterized in that the ends of said teeth (214a, 214b, 224) o is formed said   conduit (24) are made with an extra thickness of the inner wall.   12. Device according to one of claims 9 to 11, characterized   in that the connection system comprises three teeth, two of which (214a, 214b) are carried by the joined edge of one of the parts (21) being separated by a cutout (212) in which the   third tooth (224) carried by the joined edge of the other part (22).   13. Device according to one of claims 9 to 12, characterized   in that the longitudinal ends of the conduit (24) of the connection system are provided with an eyelet (240) to facilitate the introduction and the extraction of the axis (4) engaged with radial tightening in said conduit (24).   14. Device according to one of the preceding claims,   characterized in that the two parts (21,22) of the shell (2) are joined in a joint plane which is substantially parallel to the base plane of said shell (2) thereby defining an upper part (21) and a lower part (22).   15. Device according to one of the preceding claims,   characterized in that the contiguous edges opposite said parts (21, 22) comprise, on at least one face of the shell (2), slots complementary (215,225).   16. Device according to one of the preceding claims,   characterized in that the vertical section of the shell wall (2) at the contiguous edges facing the parts (21,22) is made up at least locally of tenons (216) and / or mortises (226) ensuring a   flush assembly of said parts (21,22).   17. Device according to claim 16, characterized in that the internal flank (216a) of the pins (216) is higher than the flank exterior (216b).   18. Device according to one of the preceding claims,   characterized in that the upper face (2a) of the shell (2) comprises at minus a handful.   19. Device according to claim 17, characterized in that the upper face (2a) of the shell (2) is provided with three handles (213a, 213b, 213c), the central handle (213b) being offset from   to the two side handles (213a, 213c).   20. Device according to one of claims 18 and 19,   characterized in that the lower face (2c) of the shell (2) comprises, for stacking, at least two oblong cavities (223a, 223b, 223c) and an at least partially cylindrical cavity (25) adapted to receive respectively the handles (213a, 213b, 213c) and the neck (11) of the   container (1) of a device of the same type.   21. Device according to one of the preceding claims,   characterized in that the lower face (2c) of the shell (2) comprises a cavity (26) opening onto one of the lateral faces and intended for manual gripping with a view in particular to facilitating the emptying of the container (1).   22. Device according to one of the preceding claims,   characterized in that the container (1) has an upper face (la) inclined downwards from the discharge orifice (10) which comes to rest against an internal wedging surface integral with one of the parts (21) of the hull (2). 23. Device according to claim 22, characterized in that said internal wedging surface is carried by a partition (217)   substantially parallel to the upper face (la) of the container (1).   24. Device according to claim 22, characterized in that said internal wedging surface is materialized by the ends of vertical ribs (219).   25. Device according to claim 22, characterized in that said internal wedging surface is carried by a box (218) made   by molding or possibly added in the form of an insert.   26. Device according to one of the preceding claims,   characterized in that one of the lateral faces (2b) of the shell (2) is provided with at least one light (220) making it possible to view the   level of the product in the container (1).   27. Device according to one of the preceding claims,   characterized in that the body of said container (1) is made of a flexible plastic material with a deformable wall of small thickness while its neck (11) is stiffened by a greater wall thickness.