[0001] The present invention relates to a filter paper pod for compacted coffee portions
having a shape that is asymmetrical in relation to a sealing plane of a circular peripheral
zone.
State of the art
[0003] The use of filter paper pods to package portions of ground products of varying particle
size, such as ground coffee, ground barley, tea or other similar substances, is well
known in the art.
[0004] Standardized filter paper pods which have a certain degree of compacting and display
a lenticular shape that is symmetrical in relation to the plane of the flat circular
peripheral sealing zone, are likewise known. Within said flat peripheral zone the
symmetrical pods display a characteristic rounded circular edge. During actual use
of said standardized symmetrical pods, which have a certain degree of compacting,
a drawback is manifested in that water tends initially to pass along the rounded edge
rather than being forced through the central compacted part containing the product.
This has the effect of reducing the quality of the brew obtained with said standardized
symmetrical compacted pods.
[0005] In fact, along their rounded circular peripheral edge, said pods do not fit tightly
to the filter holder of the machine that makes espresso; as a result the water tends
initially to pass through the gap formed around the edge rather than through the body
of the pod.
[0006] It is thus evident that the resulting brew will have a lower quality, precisely because
of the greater presence of water that has not passed through the central part of the
standardized symmetrical pod.
[0007] Asymmetrical pods having a very soft exterior are also known; as they are not compacted,
they must be larger in size in order to be packed with the same product weight as
standardized symmetrical compacted pods.
[0008] The problem to be solved, therefore, is to produce compacted filter paper pods having
a conformation such as to prevent water from escaping, at the start of the brewing
process, into the gap formed at the edge of the pod and ensure that it is instead
forced through the central part containing product, The solution proposed by the present
invention salves all of the problems inherent in compacted filter paper pods having
a standardized symmetrical shape and makes it possible to obtain espresso coffee of
excellent quality.
[0009] The problem is solved by a paper filter pod as mentioned at the outset wherein a
central part thereof is slightly sunken in relation to said plane.
[0010] The Invention will now be explained referring to the appended drawings, which serve
solely illustrative purposes and in no way limit the scope of the invention itself.
[0011] Figure 1 shows a diametral cross-section of ar asymmetrical compacted pod whose central
part (C') is slightly concave and sunken in relation to the plane (P) of the flat
circular peripheral sealing zone (P). It should be noted that the filter paper in
the central part (C') is in contact with the underlying portion of coffee contained
inside the asymmetrical pod.
[0012] Figure 2 shows a diametral cross-section of an espresso machine. It illustrates the
initial behaviour of water during the brewing process with a standardized symmetrical
compacted pod (E).
[0013] It should be noted that, at the start of the brewing process, water tends to flow
into the gap (G) formed along the rounded peripheral edge where the edges of the top
and bottom sections of the filter holder (S; I) do not perfectly match the shape of
the pod (E).
[0014] In fact, around the peripheral edge there is a gap (G) which allows the water to
flow downward at the start of the brewing process, without passing through the body
of the pod (E). As the brewing process continues, the initial gap (G) is filled due
to the swelling of the wet pod.
[0015] This situation results in a poorer quality brew precisely because the initial water
falls to pass through the body of the symmetrical compacted pod (E).
[0016] Figure 3 shows a diametral cross-section of an espresso machine. It illustrates the
initial behaviour of water during the brewing process with an asymmetrical compacted
pod (A) whose central part (C) is coplanar with the plane (P) of the circular peripheral
sealing zone (Z).
[0017] Also warranting particular attention is the fact that the diameter (D) of the cavity
in the section (S) forming the top part of the brewing compartment is smaller than
the diameter defining the circular zone (C) inside the peripheral sealing zone (Z)
of the pod (A).
[0018] It should be noted that the upper filter holder section (S) closes to form a seal
not only with the lower section (I) of the pod brewing compartment, but also with
part of the central zone (C) of the body of the asymmetrical pod (A).
[0019] This feature prevents water from escaping, even during the initial phase of brewing,
into the gap (G) existing around the edge of the pod and forces the water through
the central part, thereby ensuring, right from the start of the process, a homogenous,
high quality brew.
[0020] Figure 4 is analogous to figure 3 and serves to highlight that a high quality brew
may also be obtained using compacted pods (A') packed with a lower product weight.
[0021] The improvement in the brewing process prevents the undesired initial flow of water
through the gap (G) and thus ensures greater uniformity of the brew, which is of good
quality.
[0022] An extended series of practical trials has demonstrated that good quality espresso
may also be obtained with compacted pods containing reduced quantities of coffee.
[0023] The figures also highlight the simplicity of producing the compacted pod of the present
industrial invention.
[0024] In the figures the individual details are marked as follows:
A indicates an asymmetrical compacted pod containing the same quantity of product
as a standardized symmetrical compacted pod (E).
A' indicates an asymmetrical compacted pod containing a smaller quantity of product.
C indicates the flat central part of an asymmetrical pod.
C' indicates the slightly concave part of an asymmetrical pod.
D indicates the diameter of the cavity in the upper section (S) of the filter holder.
E indicates a compacted pod having a standardized symmetrical shape.
G indicates the gap formed between the edge of the pod and the brewing compartment.
I Indicates the lower section of the pod brewing compartment.
P indicates the plane of the peripheral sealing zone of a pod.
S indicates the upper section of the pod brewing compartment.
Z is the coplanar edge of a peripherally sealed pod.
[0025] The invention naturally lends itself to different embodiments as regards both the
dimensions and structural proportions, as well as the technological choices in respect
of the materials to be used in the manufacturing process.
[0026] It is evident that the pod diameter, thickness and degree of compactness will be
adapted to market demands.
[0027] The innovative concept underlying the present invention essentially consists in the
asymmetric shape of the compacted pod and the substantial coplanarity between the
central part (C) and the plane (P) of the circular peripheral sealing zone (Z) of
the pod.
[0028] Now that the inventive combinations of the present invention have been made apparent,
anyone with average skill in the art may produce, by means of simple and obvious practical
deductions, without expending any Inventive effort, asymmetrical compacted pods reproducing
the original characteristics of the present invention as claimed below.
1. Filter paper pod (A) for compacted coffee portions having a shape that is asymmetrical
in relation to a sealing plane (P) of a circular peripheral zone (Z), characterized in that a central part (C') is slightly sunken in relation to said plane (P).
2. Filter paper pod of claim 1, characterized in that the coffee packed inside the pod does not adhere to the overlying central part (C')
of the asymmetric pod (A).
3. Filter paper pod of claim 1 or 2, characterized by having a degree of compacting calibrated so as to obtain good quality espresso coffee
with portions of lower weight than standardised symmetrical compacted pods.
4. Filter paper pod of any of claims 1 to 3, characterized by having a degree of compacting calibrated so as to obtain good quality espresso coffee
with portions of equal weight to standardised symmetrical compacted pods.
1. Filterpapierpad (A) fiir verdichtete Kaffeeportionen mit einer Form, die asymmetrisch
in Bezug auf eine Versiegelungsebene (P) einer kreisförmigen Umfangszone (Z) ist,
dadurch gekennzeichnet, dass
ein mittlerer Teil (C') in Bezug auf die Ebene (P) geringfügig eingefallen ist.
2. Filterpapierpad nach Anspruch 1,
dadurch gekennzeichnet, dass
der in dem Pad verpackte Kaffee nicht an dem darüber liegenden mittleren Teil (C')
des asymmetrischen Pads (A) haftet.
3. Filterpapierpad nach Anspruch 1 oder 2,
dadurch gekennzeichnet, dass
es einen Verdichtungsgrad aufweist, der kalibriert ist, sodass ein Espresso-Kaffee
guter Qualität mit Portionen von geringerem Gewicht als genormte symmetrische verdichtete
Pads erhalten wird.
4. Filterpapierpad nach einem der Ansprüche 1 bis 3,
dadurch gekennzeichnet, dass
es einen Verdichtungsgrad aufweist, der kalibriert ist, sodass ein Espresso-Kaffee
guter Qualität mit Portionen von gleichem Gewicht wie genormte symmetrische verdichtete
Pads erhalten wird.
1. Dosette en papier filtre (A) pour des portions de café compactées ayant une forme
qui est asymétrique par rapport à un plan de scellement (P) d'une zone périphérique
circulaire (Z),
caractérisée en ce
qu'une partie centrale (C') est légèrement affaissée par rapport au dit plan (P).
2. Dosette en papier filtre selon la revendication 1,
caractérisée en ce que
le café emballé à l'intérieur de la dosette n'adhère pas à la partie centrale recouvrante
(C') de la dosette asymétrique (A).
3. Dosette en papier filtre selon la revendication 1 ou 2,
caractérisée par le fait
qu'elle a un degré de compactage calibré de sorte à obtenir un café expresso de bonne
qualité avec des portions de poids moindre de ce des dosettes compactées symétriques
standardisées.
4. Dosette en papier filtre selon l'une quelconque des revendications 1 à 3,
caractérisée par le fait
qu'elle a un degré de compactage calibré de sorte à obtenir un café expresso de bonne
qualité avec des portions de poids égal à ce des dosettes compactées symétriques standardisées.