JP6130713B2 - Bag for containing liquid products that generate gas - Google Patents

Description

  The invention relates to a bag for containing a gas-generating liquid product, in particular yeast for breadmaking.

  In the following description, reference is made in particular to yeast, but it will be understood that the present invention is applicable to any liquid or pasty product that generates gas during storage.

  Yeast is in a liquid state at the manufacturing stage and then dehydrated for transformation into a powdery or solid mass, often on the market. In the use phase, the yeast returns to the liquid state again.

  In recent years, there is a tendency to produce and package yeast in liquid form. This is because it is advantageous from a practical and economic viewpoint that the step of transforming from a liquid state to a solid state at the time of production and the step of transforming from a solid state to a liquid state at the time of use disappears.

A problem in storing liquid yeast is that a significant amount of gas, especially CO _2, is generated, ranging from 1 to 3 liters per day for a 10/20 liter package.

  Therefore, the bag on the one hand has a high gas permeability and on the other hand needs to be strong enough to support the weight of the contents. Such bags usually have a capacity of 10/20 liters.

To meet these requirements, “double wall” bags have been proposed. That is, it is composed of a very thin thickness (30 to 50 μm), a low mechanical strength and a polyethylene-based inner membrane, and a nylon-based laminate, showing high permeability to CO ₂ , and 80 to 150 μm. And an outer membrane suitable for providing the bag with the required mechanical strength.

  The outer membrane is not permeable, but has a plurality of small holes for the release of gas that permeates the inner membrane.

  The bag shaped in this way is placed inside a cardboard box so as to constitute a so-called bag-in-box package that is easy to operate.

  Bags of the type described above are unsatisfactory due to the lack of release of gas that tends to inflate the bag despite having a perforated outer membrane. .

  This is because when a bag filled with liquid yeast is placed in a cardboard box, the bag will become familiar with the box, and at a location far from the empty upper space of the bag, the outer surface of the bag and the inner side of the box This is because a contact with pressure occurs between the walls.

  Due to the pressure contact, strong adhesion occurs between the inner membrane of the bag and the outer membrane of the plastic, which actually closes the holes provided in the outer membrane and thus prevents gas release. This gas tends to accumulate at the top of the bag, where the gas is difficult to discharge because the perforated surface of the outer membrane that is not in contact with the inner wall of the storage box is small.

US Patent Application Publication No. 2009/239432 (published on Sep. 24, 2009) German Utility Model No. 20 2006 011976 (published on October 19, 2006) US Patent Application Publication No. 2008/116098 (published May 22, 2008) International Publication No. 98/46498 (released October 22, 1998)

  The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art.

  More particularly, it is an object of the present invention to provide a bag for liquid yeast that allows complete and rapid degassing of the product contained therein.

  Another object of the present invention is to provide a bag that is simple and economical to manufacture.

  The bag according to the invention has the features of the attached independent claim 1.

  Advantageous embodiments of the invention are described in the dependent claims.

In essence, the bag according to the present invention is:
It is a so-called double wall type bag,
It has a polyethylene-based highly permeable inner membrane and an outer membrane for reinforcement,
The outer membrane is a non-woven fabric of polyethylene-based fibers and can be sealed to the inner membrane.

Advantageously, the fibers of the outer membrane nonwoven are constituted by a mixture of polypropylene and polyethylene (PP / PE) having a weight of 60 to 85 g / m ² .

  Further features of the present invention will become more apparent from the following detailed description, which refers to one of the embodiments by way of non-limiting example only illustrated in the accompanying drawings.

  The present invention has the specific effect that gas generated by the liquid product contained in the bag can be completely and quickly released by simple and economical means.

It is a schematic plan view of the bag which concerns on embodiment of this invention. It is an expanded sectional view along line II-II of FIG. It is a schematic perspective view of the bag of FIG.

  Referring to the drawings, a bag according to the present invention is a bag for containing a liquid product that generates gas, particularly yeast, and is indicated by member number 1.

  The bag 1 comprises two opposing surfaces 2 that run parallel to the outer end 4 and are joined together with a surrounding heat-sealed wire 3.

  As shown in the accompanying drawings, the bag 1 is drawn in a rectangular shape that is most easily formed, but it is obvious that any other shape may be used.

  The bag 1 is of the so-called double wall type, that is, each of the two opposing surfaces 2 of the bag 1 has two membranes, namely an inner membrane 5 and an outer membrane 6 for reinforcement, The opposing surfaces 2 are separated from each other and are connected to each other only at the surrounding heat-sealed line 3.

  A spout 7 for filling and discharging the liquid product is attached to one of the two opposing surfaces 2 of the bag 1. The spout 7 has a circular base flange 8 sealed inside the corresponding facing surface 2, and the spout 7 protrudes from a hole formed in the facing surface 2 and is covered by a lid 9. Closed.

Intimal 5 of a double-walled bag 1, the gas, in particular, with respect to CO _2, has a high permeability. CO ₂ is produced in large quantities by the yeast in the bag and exceeds 50 liters / m ² (50 l / m ² day atm) per day per atmosphere. The inner membrane 5 is a polyethylene base, for example a coextruded LLDPE (linear low density polyethylene) base, with a very thin thickness in order to be able to achieve the high permeability values mentioned above. (About 30 μm) and a weight of 28 g / m ² .

  Such an inner membrane 5 is very fragile by itself and is therefore easily broken.

  Therefore, the outer membrane 6 is assigned the role of giving the bag robustness and avoiding easy tearing.

According to the invention, the outer membrane 6 is made of a non-woven fabric of fibers composed of a mixture of polypropylene and polyethylene (PP / PE) with a weight of 60 to 85 g / m ² .

  Due to the presence of polyethylene in the mixture constituting the nonwoven fibers, the operation of the surrounding heat sealing line 3 with respect to the inner membrane 5 is permitted, and the heat sealing of the base flange 8 of the spout 7 is likewise permitted. .

  By manufacturing the outer membrane 6 of PP / PE nonwoven fabric, the disadvantage caused by adhesion between the inner membrane 5 and the outer membrane 6 when the bag 1 is inserted into a storage box (bag-in-box), usually a cardboard box, is eliminated. It becomes possible to do.

In fact, since the nonwoven fabric according to the present invention has larger wrinkles than the plastic film with holes in the prior art, the adhesion between the films is prevented, and the gas, especially to facilitate the release of CO _2.

From the above, it can be seen that the advantage of the present application is that the CO ₂ gas generated by the liquid product contained in the bag 1 can be completely and quickly released by simple and economical means.

  Of course, the present invention is not limited to the specific embodiments shown so far in the accompanying drawings, but instead is within the scope of the invention as defined by the appended claims, to the extent conceivable to those skilled in the art. Numerous detailed changes can be made without departing from.

  The present invention can be used for any liquid or pasty product that generates gas during storage.

DESCRIPTION OF SYMBOLS 1 Bag 2 Opposite surface 3 Heat sealing line 4 Outer end 5 Inner membrane 6 Outer membrane 7 Spout 8 Base flange 9 Lid

Claims (6)

A double wall type bag for containing a gas generating liquid product,
The bag is attached to one of the two opposing surfaces (2) joined together along the surrounding heat sealing line (3) and the opposing surface (2) to fill the liquid product and A spout (7) for discharging,
The double wall of the bag comprises a polyethylene-based permeable inner membrane (5) and an outer membrane (6) for reinforcement;
The bag characterized in that the outer membrane (6) is made of only a nonwoven fabric which is a mixture of polypropylene and polyethylene (PP / PE) . Bag of claim 1, wherein the weight of the nonwoven fabric of the outer layer (6) is to no 60 85g / m ^2. The bag according to claim 1, characterized in that the inner membrane (5) is coextruded LLDPE (linear low density polyethylene) of 30 µm, 28 g / m ² . The bag according to any one of claims 1 to 3, wherein the liquid product generates gas during storage. The bag according to any one of claims 1 to 4, wherein the gas is carbon dioxide. The bag according to any one of claims 1 to 5, wherein the liquid product is yeast.

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