JPH03503517A - flexible container - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] flexible container The present invention is a substantially cylindrical tube made of a hose-like fabric, consisting of a body and two ends. a shaped support portion and a flexible support portion contained within and in contact with the support portion; A container consisting of a film and a valve for filling or discharging the contents of the container are provided in the front. It consists of an inner cover in the center of the end, and the fabric of the supporting part is folded around the valve. Relating to flexible containers that are folded to form at least two fabric layers on the supporting portion. do.

Flexible containers of this type are conventionally known. Usually they are 500 to 15 It is made in the size of 00 liters and can be used for liquid chemicals, adhesives, wine, juice, etc. What kind of transportation is it being used for? The container is usually placed on a pallet with its central axis aligned with the pallet. It is placed perpendicular to the top. It is possible to rent out containers because they are for disposable use. It is made from thin and inexpensive film. The supporting part is supposed to bear all the stress. Therefore, appropriate strength is required.

The support part is made of hose, which is folded around the ring at the end of the container. As such, the support portion typically consists of two overlapping layers. preferable The material is synthetic fiber fabric. The material is squeezed at the end of the container, so the end of the container The depth of such wrinkles or folds is limited to the body of the container. It becomes larger towards the central axis.

If the container is subjected to an internal load that exceeds the strength of the supporting part, for example due to an impact, In most cases, the end of the container is often the first to fail. According to research results, Inside the holding part, the warp threads running in the longitudinal direction of the container break first; The thread passing through the bottom of the pleat, that is, closest to the center line of the container. Ru. This means that the distance between the rings of such a warp thread is far apart, and the length of the warp thread that passes through the It is based on the fact that it is smaller than thread. In other words, the warp threads are short to some extent. It is.

Another problem with the formation of folds is that during peak shock internal loads, By pushing the inner film into the folds of the inner layer of the supporting part The film is torn.

It is an object of the present invention to provide a flexible container with improved edge strength. be. The container has a leveling screw in between the fabric layers of the support portion at the end of the container. It is characterized by having a leveling course.

Sandwich one layer, which we will call the leveling course, between the supporting layers. This improves the edge strength more than expected, but the improvement effect depends on the number of layers in the container. The improvement effect is considerably greater than that normally expected to be obtained by increasing It is. The reason for this is not necessarily clear, but the following considerations suggest that I'm there, but I can't resist. The distribution of folds in the supporting part is towards the center of the container in the inner layer There is now always an outward bent part of the outer layer immediately before an inward bent part. It turned out that death! Second, when a sudden internal load is applied, the internal The warp threads at the direction bending section move outward a relatively long distance to form the outward bending section. It is possible to reach the bottom.

This movement stretches the warp threads, causing them to fold outward. It is common for the material to break by the time it reaches the bottom of the bend. support layer If there is a leveling course in between, the warp threads will move into the outward bent part like this. By preventing the yarn from moving, it reduces the peak load on the yarn. Ru.

From a practical standpoint, this also applies to films rented out.

The pleats in the inner layer of the supporting part cannot extend to the outward folds of the outer layer; Since the shock only reaches the middle surface of the supporting part, it occurs at the peak of the shock. The folds are not as deep as they would be without them and therefore there is no risk of tearing the film. The risk is smaller than in known containers. In this way, between the layers of the support part; The layer will exert a leveling effect on the supporting part.

This favorable effect of the leveling course is particularly large because its rigidity is This is the case when the fabric is larger than the minute fabric. In this case, the leveling course is have a stiffness and density greater than that of the material, such as preferably a density of about 2009/ Preferably, it is made of textile.

The simplest shape for the leveling course is approximately the same diameter as the end of the valve. l: A circular piece of material with a hole. It is loose between the layers of the supporting part It was found that the effect is best when it is sandwiched.

Hereinafter, an example of a preferred embodiment of the container of the present invention will be further explained based on the accompanying drawings. Explain in detail. In the figures, Fig. 1 is a partially cutaway side view of the container of the present invention, and Fig. 2 is a main view of the container of the present invention. Figure 3 is a detailed axial sectional view of the main parts of the invention container, and a detailed enlarged view along the peripheral line near the upper valve. It is a large sectional view.

The container illustrated in Figure 1 is a generally cylindrical cylinder made of two layers 2, 3 of synthetic fabric. A supporting part 1 of the shape and a flexible plastic part inside it and in contact with it. It consists of an inner bag 4 made of film. The torso and lower end of the supporting part are the legs. It is wrapped in an outer bag 5 which has a pocket 6 for inserting the item 7. These legs are It is fixed to a pallet 8 on which the utensils are placed. A valve 9 is provided in the center of the end. However, only the upper valve is shown in the diagram.

The support part is made of a hose-like fabric, which corresponds to the ring 10 indicating the position of the valve. By the way, it's turned around. The free diameter of this hose is They are made of the same material, so if you squeeze it at ring 10, you can choose which layer 2 or 3 at the end. Also, folds 11 will be formed. The depth of the pleats is on the center line from the body of the container. It increases continuously towards the valve located at .

In the present invention, a leveling course 1 is provided between the layers 2 and 3 of the support part at the end of the container. 2 is placed. This leveling course 12 is compared to the layer of the support part. relatively stiff, e.g. higher than the fabric of the support part, e.g. g/la" density. In the illustrated embodiment, the leveling The connecting course consists of a circular sheet approximately the same diameter as the end with a hole for the valve. It is made of The leveling course is loosely sandwiched between layers 2 and 3 of the supporting part. Because of its hardness, it does not penetrate into the folds 11 of the supporting part. Its shape is roughly the same as the main plane of the end.

FIG. 3 shows the formation of folds near the ring IO.

The warp threads, ie the threads running in the longitudinal direction of the support section, are designated by the reference numeral 13. The warp thread is Since they are all the same length, a certain warp thread bends inward in inner layer 3. If it passes through part I4, then in outer layer 2 it passes through outward bent part 15. It becomes. A flat leveling course 12 is sandwiched between both layers.

When the container is subjected to an impact, for example, and the outward pressure towards the end of the container suddenly increases. In this case, the inner bag 4 and the inner layer 3 of the support part are pressed outward. If leveling If there were no course 12, the inside part of the warp thread 13 would be folded outward at that point. It is pressed outward against the bottom of the bent portion 15, that is, the outer part of the warp thread. This may happen.

At this time, the stress on the inner part increases and fracture occurs. However, If leveling course 12 is used, the outward movement of the warp threads will stop midway on the surface of the supporting part. This limits the stress on the thread.

Below are the results of drop tests conducted on various types of containers at different drop distances. I will explain. In the table, al is at both ends according to Finnish patent 70691. Containers with axial twist in minutes and without leveling course, a2 is the same as above. Same but with a leveling course at one end, BL is a container with no axial twist at both ends and no leveling course. b2 indicates the same as above, but with a leveling course.

The depth of the folds increases closer to the pulp, so the above is different from the above. Differently, the diameter of the leveling course is made to correspond to about 2/3 of the diameter of the end. It's okay. The leveling course can be fixed to the support part or fixed to ring 10 if it is okay. The material may be different from those mentioned above. The support part is 3 There may be more than one layer.

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Claims (5)

[Claims] 1. A substantially cylindrical body made of a hose-like fabric, consisting of a body and two ends. made of a support part (1) and a flexible film placed in contact within the support part; Fill the prepared inner bag (4) and the container placed in the center of both ends of the container with the contents. , a pulp (9) for discharging, and the fabric of the supporting part (1) at least two fabric layers (2, 3) folded back against the support section; and leveling between the fabric layers (2, 3) of the supporting parts at both ends of the device. A flexible container characterized by being provided with a course (12). 2. The leveling course has higher rigidity compared to the supporting part fabric (2, 3). , preferably consisting of a fabric having a higher density of about 200 g/m2. The flexible container according to claim 1, characterized in that: 3. The leveling course (12) has a diameter approximately equal to the diameter of the end, and Claim 1, characterized in that it consists of one circular piece with a hole for flexible container. 4. The leveling course (12) is loosely sandwiched between the layers (2, 3) of the support part. The flexible container according to claim 1, characterized in that: 5. The shape of the leveling course (12) matches the main surface of the end. The flexible container according to claim 1.