FR2555553A1 - FLEXIBLE CONTAINER FOR TRANSPORTING FLUIDS - Google Patents

Abstract

THE INVENTION RELATES TO A CONTAINER FOR TRANSPORTING FLUIDS, INCLUDING AN OUTER BAG 4, AN INSIDE BAG 5, AND A FILLING AND DISCHARGE DEVICE 3 OF THE FLUID. IT IS EASY TO MAKE A VACUUM IN THE SPACE BETWEEN THE OUTER BAG AND THE INSIDE BAG IF THE OUTER BAG IS MANUFACTURED FROM AN AIR-PERMEABLE FABRIC.

Description

The present invention relates to a flexible container intended for the transport of

  fluids, comprising an outer bag, a separate inner bag placed inside said outer bag, and a device for filling and discharging the fluid, fixed at least to the inner bag. For the transport of liquids, such as juice, wine and oil, by boat and by truck, systems for loading the liquid into large quantities are known in the art.

  flexible containers with a capacity of approximately 5 to 20 m. By compa-

  right with rigid drums, these containers have the advantage of occupying very little space in the deflated state during transport

  back. In addition, they are light in weight.

  To fill a container consisting of an outer bag and an inner bag, the inner bag is pushed into the outer bag, after which the filling and discharging device is connected to the openings, placed directly opposite one of the other, the inner bag and the outer bag. After that, the inner bag is filled with air and, finally, the air is replaced by the liquid to be transported. If desirable, we can omit

filling with air.

  So that the thin inner bag does not tear when

  filling of the inner bag due to relative displacements

  the outer bag and the inner bag, the air in the space between the outer bag and the inner bag must be exhausted to a very large extent. So far, this has been done using small openings at the top of the outer bag. However, it has become evident that the intermediate space does not empty its air enough by means of the openings in the outer bag to allow the use, for the inner bag, of enough materials.

  thin so that the container is economically advantageous.

  The emptying of the intermediate space becomes particularly

  This is particularly difficult in the case where the container is of the type according to which the inner bag is attached to the outer bag over its entire circumference. The intermediate space therefore consists of at least two separate compartments, both of which must have

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  openings in the outer bag.

  The object of the invention is to achieve by simple means as good an evacuation as possible of the space existing between the outer bag and the inner bag, in connection with the operation of filling the inner bag with air. For this purpose, the container according to the invention is distinguished in that the outer bag consists mainly of a permeable fabric

  to the air. Since the outer bag is made of a per-

  air-permeable, air can exit the intermediate space

  all the points where an air pocket is formed between the outer bag

  laughing and the airtight inner bag.

  Despite its air permeability, the fabric can be made very durable; it is made of polypropylene yarn,

  polyethylene, polyester or polyamide.

  The following description, intended for illustration

  of the invention, aims to give a better understanding of its characteristics and advantages; it is based on the appended drawings, among which:

  FIG. 1 is a view of a container according to the invention.

  tion in the filled state; Figure 2 is a sectional view of the container; and Figure 3 shows a detail of Figure 2 at a

enlarged scale.

  The container shown in the drawing has a cylindrical shape and comprises an envelope surface 1 and two surfaces

  2. One of the terminal surfaces has an arrangement

  filling and discharging sitive 3. In a magnified detail appears

  falling above Figure 1, we see how the container wall is formed. The outer bag 4 consists of a layer of relatively thick plastic material having a high resistance, while the inner bag 5 consists

  a thin plastic film, preferably flexible.

  In the embodiment shown in the drawings, the bag

  outer 4 and inner bag 5 both have two parts

  parts in the form of a half-cylinder which are joined so

to form a complete cylinder.

  The edge zones of the inner bag 5 are welded together, for example by applying heat or ultrasound, in order to form a protruding rim 6 which extends all around the inner bag. The edge zones 7 of the outer bag 4 are folded outwards correspondingly, so that they surround the rim 6, as shown in FIG. 3, and they are sewn to each other by a seam 8, Since the seam passes through the rim, the inner bag is fixed to the outer bag at the same time as it joins the respective parts

of the outer bag.

  According to the invention, the outer bag consists of a breathable fabric of threads of artificial fibers,

  for example polypropylene, polyethylene, polyester or polyamide.

  Therefore, it is not necessary for the container to be provided with any means making it possible to empty the space existing between the outer bag and the inner bag, for example holes in the outer bag. This results in a considerable saving of work, since said intermediate space consists, in the embodiment shown, of two parts which should both be provided with holes. However, the inner bag and the outer bag can also include a greater number of parts, for example three, so that the number of holes

should be even bigger.

  Of course, those skilled in the art will be able to ima-

  giner, from the container whose description has just been

  given for illustrative purposes only and in no way limitative, various variants and modifications do not depart from the scope of the invention.

Claims (2)

R E V E N D I C A T I ONS   1. Flexible container for transporting fluids, comprising an outer bag (4), a separate inner bag (5) which is contained in said outer bag, and a device for filling and discharging (3) of the fluid, which is fixed to the less to the inner bag (5), characterized in that the outer bag (4) is substantially formed breathable fabric.   2. Container according to claim 1, characterized in that the fabric (1) is made of polypropylene, polyethylene threads, polyester or polyamide.