PLASTICS BARREL

METHODE DE FABRICATION DE BARILS EN PLASTIQUE

English Abstract

ABSTRACT
A method of forming a plastics barrel by
moulding, in which an outwardly-extending peripheral
fold or corrugation is formed in the barrel wall.
The fold is compressed while plastic so as to form
an outwardly-extending peripheral flange of
enlarged thickness.

Claims

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A container, comprising in combination a container
body including an upper wall portion having a predetermined
thickness and comprising an upwardly converging section and a
substantially upright section above the converging section and
with which the converging section is unitarily integrated; a neck
portion axially spaced from said upper wall portion and having
substantially said predetermined wall thickness; a first radially
outwardly extending flange unitarily integrated with the substan-
tially upright section of said upper wall portion of said
container and with said neck portion, said first flange having
an upper surface and an axial thickness which is equal to
substantially twice the thickness of said predetermined thickness;
a lid comprising an external circumferentially complete wall
surrounding said neck portion and including a second radially
outwardly extending flange, and an annular connecting element
operative for clamping said first and second flanges together
in the axial direction of the container.
2. A container as defined in claim 1, wherein said neck
portion has an undulated configuration in the axial direction of
the container.
3. A container as defined in claim 1, wherein said first
and second flanges are each circumferential.
4. A container as defined in claim 1, wherein said lid
further comprises an internal wall receivable within said neck
portion, and a transverse wall extending substantially normal to
said internal and external walls and interconnecting the same
to thereby form an annular channel therewith.
5. A container as defined in claim 1, wherein said neck
portion has a corrugated upper end face and further comprises an
annular sealing element receivable in said channel so as to seal-
ingly contact said neck portion when engaging the corrugated

upper end face and said lid to thereby seal the interface between
said neck portion and said lid.
6. A container as defined in claim 1, wherein said
first flange is above the substantially upright section and is
below said neck portion.

Description

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The present invention relates to a blow-mould~d p]astics
barrel.
Plastics barrels are known in which an outwardly-
extending peripheral fold is formed at a distance below the barrel
opening. This fold acts as a peripheral bead. The opening is
closed by a plastics lid which is dished to fit into the barrel
opening. The lid also has a depending skirt terminating in an
outwardly-extending flange which may be clamped to the bead by
a clamping ring.
Under vertical stacking loads of the kind which occur
when several filled barrels are stacked one upon each other the
peripheral bead is irr~egularly compressed. Consequently, the
barrel stack may topple and the lid may become unsealed.
It is known to reinforce the peripheral folds by forming
inwardly-directed bights, i.e. indentations from the outside of
the fold, uniformly distributed along the circumference of the
fold. Axial compression of the fold is thus substantially
eliminated.
A disadvantage of the indentations is that they reduce
the radial stiffness of the barrel fold, and also the parts of
the fold between the indentations hold residues after the barrel
is emptied.
Accordingly, the present invention provides a container,
comprising in combination a container body including an upper
wall portion having a predetermined thickness and comprising an
upwardly converging section and a substantially upright section
above the converging section and with which the converging
section is unitarily integrated; a neck portion axially spaced
from said upper wall portion and having substantially said
predetermined wall thickness; a first radially outwardly extending
flange unitarily integrated with the substantially upright section
of said upper wall portion of said container and with said neck
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portion, said first flange having an upper surface and an axi~l
thickness which is equal to substantially twice the thic~;ness ol
said predetermined thickness; a lid comprising an external
circumlerentially complete wall surrounding said neck portion
and including a second radially outwardly extending flange, and
an annular connecting element operative for clamping said first
and second flanges together in the axial direction of the
container.
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The invention further provides a plastics barrel
formed by the above-described method.
A~ embodiment of the invention will now be described
with reference to the accompanying drawings, wherein:
Fiyure 1 shows in longitudinal section part of the barrel
during forming of the peripheral fold,
Fiyure 2 is a similar view of ~igure 1~,
but with the fold compressed to form a flange,
and,
Figure 3 shows in longitudinal section part of the upper
end of a barrel with a lid mounted thereon.
In Figure 1 a barrel wall 1 has been blow moulded in two
mould halves 2 and 3 so as to form an outwardly-extending
peripheral fold or bead 4. ~he fold 4 is spaced from one end of the
barrel by means of a corrugated neck portion 5.
While the material of the barrel wall is still plastic, .
the two mould halves 2, 3 are moved axially towards each other
in the direction of the arrows in Figure 1 so that the fold 4 is
compressed to form an outwardly-extending flange 6 (Figure 2).
As can be seen from Figure 2, the flange has an upper peripheral
surface 7, which extends outwardly at right angles from the
longitudinal axis of the barrel, and a lower peripheral surface
8, which is inclined to the longitudinal axis of the barrel so that
the cross section of the flange 6 decreases in an outwards
direction.
The barrel wall 1 is removed from the mould and cut
along a line 9 to form an open end 10. As can be seen from
~ Figures 2 and 3 the peripheral flange 6 is considerably thicker
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than the barrel wall 1.
In Figure 3, the open end lO is closed by a lid 11,
which has a dished portion 12 fitting inside the open end lO.
The l.i.d 11 has an inner depending periphera]. skirt 13, which
contacts the inside of the neck 5. The lid 2 also has an outer
depending peripheral skirt 14, which surrounds the outside
of the neck S and terminates in an outwardly-extending peripheral
flange 15. The flange 15 is clamped to the flange 6 by means
of a clamping rlng 16. A deformable seal 17 has been inserted
between the top end of the barrel neck 5 and that part of the
lid 11 between the skirts 13, 14.
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