U.S. patent application number 13/856737 was filed with the patent office on 2013-10-24 for bag for the containing of liquid products emanating gas, in particular yeast.
This patent application is currently assigned to Goglio S.P.A.. The applicant listed for this patent is GOGLIO S.P.A.. Invention is credited to Giorgio BOTTINI, Luca FANTONI, Franco GOGLIO.
Application Number | 20130279830 13/856737 |
Document ID | / |
Family ID | 46051760 |
Filed Date | 2013-10-24 |
United States Patent
Application |
20130279830 |
Kind Code |
A1 |
GOGLIO; Franco ; et
al. |
October 24, 2013 |
BAG FOR THE CONTAINING OF LIQUID PRODUCTS EMANATING GAS, IN
PARTICULAR YEAST
Abstract
Bag for containing liquid products which produce gas, in
particular yeast, of the double wall type, including two opposite
faces (2) joined one to the other along a perimeter heat-sealing
line (3) and a spout (7) for filling/delivering the liquid product
placed on one of these faces (2), the double wall of the bag
including a polyethylene-based inner film (5) with high
permeability and a reinforcing outer film (6), wherein the outer
film (6) is made of a polyethylene-based nonwoven fabric.
Inventors: |
GOGLIO; Franco; (Milano,
IT) ; BOTTINI; Giorgio; (Gallarate (Varese), IT)
; FANTONI; Luca; (Induno Olona (Varese), IT) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
GOGLIO S.P.A. |
Milano |
|
IT |
|
|
Assignee: |
Goglio S.P.A.
Milano
IT
|
Family ID: |
46051760 |
Appl. No.: |
13/856737 |
Filed: |
April 4, 2013 |
Current U.S.
Class: |
383/109 |
Current CPC
Class: |
B65D 33/01 20130101;
B65D 75/5877 20130101; B65D 31/04 20130101; B65D 85/72
20130101 |
Class at
Publication: |
383/109 |
International
Class: |
B65D 85/72 20060101
B65D085/72 |
Foreign Application Data
Date |
Code |
Application Number |
Apr 18, 2012 |
IT |
MI2012A 000647 |
Claims
1. Bag for containing liquid products which produce gas, in
particular yeast, of the double wall type, comprising two opposite
faces (2) joined one to the other along a perimeter heat-sealing
line (3) and a spout (7) for filling/delivering the liquid product
placed on one of these faces (2), the double wall of the bag
comprising a polyethylene-based inner film (5) with high
permeability and a reinforcing outer film (6), characterised in
that said outer film (6) is made of a polyethylene-based nonwoven
fabric.
2. Bag according to claim 1, characterised in that said nonwoven
fabric is a mixture of polypropylene and polyethylene (PP/PE).
3. Bag according to claim 1, characterised in that said nonwoven
fabric of the outer film (6) has a weight of 60-85 g/m .sup.2.
4. Bag according to claim 1, characterised in that said inner film
(5) is a coextruded LLDPE of 30 .mu.m and 28 g/m.sup.2.
Description
FIELD OF THE INVENTION
[0001] The object of the present invention is a bag for the
containing of liquid products which emanate gas, in particular
yeasts for bread making
BACKGROUND OF THE INVENTION
[0002] In the following description specific reference will be made
to yeast, but it is to be understood that the invention can be
applied to any liquid or paste product which during storage
emanates gas.
[0003] Yeast, in the phase of production, is always in the liquid
state and, for the placing on the market, in the majority of cases,
is subsequently dehydrated in order to transform it into powder or
into the form of solid cakes. In the phase of use the yeast has
once again to be returned to the liquid form.
[0004] In recent times there has been the tendency to produce and
package the yeast directly in liquid form which is advantageous
from practical and economic standpoints in that the phases of
transformation from the liquid state to the solid state during
production and vice versa during use are eliminated.
[0005] The problem in the storage of the liquid yeast is that it
emanates a considerable quantity of gas, in particular CO.sub.2, up
to 1/3 litres a day for a package of 10/20 litres.
[0006] Bags are therefore necessary which on the one hand are
highly permeable to the gases and on the other hand have adequate
toughness for sustaining the weight of the content, these bags
normally having a capacity of 10/20 litres.
[0007] In order to meet these needs "double wall" bags have
therefore been proposed, i.e. having a polyethylene-based inner
film highly permeable to CO.sub.2, with very thin thickness (30-50
.mu.m) and therefore with little mechanical strength, and an outer
film constituted by a nylon-based laminate, with thickness of
80-150 .mu.m, suitable for conferring the necessary mechanical
strength to the bag.
[0008] The outer film, which is not permeable, has a plurality of
small holes to allow the release of the gases which permeate
through the inner film.
[0009] The bag shaped in this way is placed inside a cardboard box
in such a way as to constitute a so-called bag-in-box packaging
which can easily be manipulated.
[0010] The bags of the aforementioned type have not proved to be
satisfactory in that despite the providing of the perforated outer
film an unsatisfactory release of the gases which tend to inflate
the bag has been noted.
[0011] This is due to the fact that when the bag filled with liquid
yeast is inserted in the cardboard box it adapts to the box,
causing a pressure contact between the outer surface of the bag and
the inner walls of the box, apart from the head space of the bag
which remains clear.
[0012] This pressure contact causes a strong adherence between the
inner and outer plastic films of the bag, practically clogging the
holes provided in the outer film and preventing therefore the
release of the gases, which tend to accumulate in the upper part of
the bag, where they have difficulty in exiting due to the small
perforated surface of the outer film not in contact with the inner
wall of the containing box.
SUMMARY OF THE INVENTION
[0013] The object of the invention is that of eliminating the
aforesaid disadvantages of the prior art.
[0014] More particularly an object of the invention is that of
providing a bag for liquid yeasts which allows a complete and rapid
degassing of the product contained therein.
[0015] Another object of the present invention is that of providing
such a bag which is simple and economical to manufacture.
[0016] The bag according to the invention has the features of the
annexed independent claim 1.
[0017] Advantageous embodiments of the invention are disclosed by
the dependent claims.
[0018] Substantially the bag according to the invention, of the
so-called double wall type, comprises a polyethylene-based inner
film with high permeability and a reinforcing outer film, wherein
the outer film is a nonwoven fabric of polyethylene-based fibres,
so as to be sealable to the inner film.
[0019] Conveniently the fibres of the nonwoven fabric of the outer
film are constituted by a mixture of polypropylene and polyethylene
(PP/PE), with a weight of 60-85 g/m.sup.2.
BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Further features of the invention will be made clearer by
the following detailed description, referred to one of its
embodiments purely by way of a non-limiting example illustrated in
the accompanying drawings, in which:
[0021] FIG. 1 is a schematic plan view of the bag according to the
invention;
[0022] FIG. 2 is an enlarged section view taken along line II-II of
FIG. 1;
[0023] FIG. 3 is a schematic perspective view of the bag of FIG.
1.
DETAILED DESCRIPTION OF THE INVENTION
[0024] Referring to these drawings, the bag according to the
invention, for the containing of liquid products which emanate gas,
in particular yeast, has been denoted by reference numeral 1.
[0025] It comprises two opposite faces 2, joined by means of
perimeter heat sealing 3, which runs parallel to its outer edge
4.
[0026] In the accompanying drawings the bag 1 has been illustrated
rectangular in shape, which is the simplest to make, but it is
clear that it can take on any other shape.
[0027] The bag 1 is of the so-called double wall type, in the sense
that each of its two opposite faces 2 comprises two films, an inner
one 5 and an outer one 6, separated one from the other and joined
only at said perimeter heat-sealing line 3.
[0028] On one of the two faces 2 of the bag 1 a spout 7 for
filling/delivering of the product is applied, having a circular
flange 8 sealed internally to the corresponding face 2, while the
spout 7 projects through a hole formed in this face, and is closed
by a cap 9.
[0029] The inner film 5 of the double wall of the bag is with high
permeability to gases, in particular to CO.sub.2 which is produced
in a large quantity by the yeast contained in the bag, >50
l/m.sup.2day atm. It has a base of polyethylene, for example a
coextruded LLDPE and has a very thin thickness (around 30 .mu.m)
and a weight of 28 g/m.sup.2 in order to be able to obtain the
aforesaid high values of permeability.
[0030] Such a film would alone be very fragile and therefore
subject to easy tearing.
[0031] Therefore the outer film 6 is assigned the task of
conferring toughness to the bag and avoiding easy breaking
[0032] This outer film 6, according to the invention, is a nonwoven
fabric of fibres constituted by a PP/PE mixture of 60-185
g/m.sup.2.
[0033] The presence of polyethylene in the mixture constituting the
fibres of the nonwoven fabric allows the performance of the
perimeter heat sealing 3 to the inner film 5, as well as the heat
sealing of the base 8 of the spout 7.
[0034] The manufacture of the outer film 6 in PP/PE nonwoven fabric
allows the elimination of the disadvantages due to the adherence
between the inner and outer films when the bag 1 is inserted in a
containing box (bag-in-box) normally in cardboard.
[0035] In fact the greater wrinkling of the nonwoven fabric
according to the invention, with respect to the perforated plastic
film of the prior art, prevents the adherence between the films and
allows easy release of the gas, in particular CO.sub.2, through the
nonwoven fabric of the outer film 6, which has micro holes over the
entire surface.
[0036] From what has been disclosed the advantages appear clear of
the invention which allows, with simple and economical means, the
complete and rapid release of the CO.sub.2 gas produced by the
liquid contained in the bag 1.
[0037] Naturally the invention is not limited to the particular
embodiment previously described and illustrated in the accompanying
drawings, but instead numerous detail changes can be made thereto,
within reach of the person skilled in the art, without thereby
departing from the scope of the same invention as defined in the
annexed claims.
* * * * *