JPS5933822Y2 - flexible container - Google Patents

Description

[Detailed description of the invention] The present invention relates to a flexible container constructed of a sandwich-structured sheet with a plain woven fabric as the base fabric and soft plastic layers on both sides.
This improves the airtightness of the main body and at the same time improves the filling or discharging pipe connected to the main body of the container.

Flexible containers are widely used as packaging materials to streamline logistics through bulk transportation of powder and granular materials, but due to their material and structure, they cannot be expected to be airtight from the outside air.
It has the disadvantage that it cannot be used for objects whose quality changes due to contact with outside air.

Therefore, in a flexible container, it is necessary not only to ensure the airtightness of the container itself, but also to give sufficient consideration to the sealing when the filling tube or discharge tube is fastened.

Regarding such problems, first of all, regarding the airtightness of the container itself, the present applicant has already proposed U.S. Pat.
The problem is solved by a flexible container disclosed in US Pat. No. 81,888).

However, when it comes to sealing when closing the filling or discharging tube, various methods can be considered, including the clip method, which is superior in terms of workability, but it is difficult to maintain the seal completely with any of the methods. It is.

The reason for this is that conventional filling and discharging tubes are manufactured by processing sheets into a cylindrical shape, so there is a difference in level between the two ends where the front and back sides are overlapped. This is because the gap between the steps communicates with the outside air, making it impossible to ensure airtightness.

Therefore, in the present invention, the container itself is
-165040 (Utility Model Application Publication No. 56-81888), in which a soft plastic layer is provided on both sides of a plain woven fabric as a base fabric, and airtight plastic is inserted into the soft plastic layer. It is formed using a sheet with a composite structure provided with a film as an inner layer, while the filling or discharging tube is formed of a flexible sheet with airtightness. The above problem is solved by attaching the front and back surfaces on the part side and joining (welding) the back sides on the tip side.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

First, in FIGS. 1 to 4, 1 is a container main body, and this container main body 1 is made of plain woven fabric 1 as shown in FIG.
It is formed of a sheet with a composite structure in which a soft plastic layer 1b is provided on both sides of a base fabric, and an airtight plastic film is provided as an inner layer 1C inside the soft plastic layer 1b.

A cylindrical body 3 serving as a discharge pipe is connected by welding to a discharge port 2 formed at the bottom of the container body 1, and this cylindrical body 3 is made of the sheet of the composite structure similar to the container body 1. However, in this case, the presence of the base fabric tends to cause unevenness on the sheet surface, and the flexibility is also impaired, and the airtightness when sealed with a clip etc. may not necessarily be sufficient. Therefore, it is preferable to use an airtight flexible sheet having a sandwich structure in which soft plastic layers are provided on both sides of an airtight plastic film, for example.

Thus, the cylindrical body 3 is attached to the container main body 1 on the part side, that is, the part side is attached to the discharge port 2 by joining the front surface 3a and the back surface 3b as shown in FIG. It has a structure in which the back surfaces 3b are joined together as shown in FIG. Next, the lower half 4a is welded to a required width on the inside with the welding line as the end, and then the outer part 4b, whose front and back surfaces are welded, is cut off.

Further, similar welding and cutting may be performed on the portion 4C corresponding to the portion 4b.

According to the structure of the cylindrical body 3 described above, since the rear surfaces 3b of the sheets are joined to each other on the tip side of the cylindrical body 3 and no gap is created due to a step, the cylindrical body is 3, the cylindrical body 3 can be completely sealed.

On the other hand, when attaching the cylindrical body 3 to the container body 1, the front side 3a and the back side 3b of the sheet are joined, so compared to the case where the back side 3b is joined to the side when the cylindrical body 3 is attached to the container body 1. Since the gap with the discharge port 2 is small, the container can be connected to the main body 1 while maintaining airtightness by filling the gap with welding.

In this case, although the cylindrical body 3 configured as described above has no problems in terms of airtightness and flexibility, it may lack strength and require reinforcement, so an embodiment using this reinforcement method is used. This will be explained by the fifth.

First, a discharge tube 5 is connected to a discharge port 2 formed at the bottom of the container main body 1.

The discharge tube 5 is formed of a sandwich-structured sheet having soft plastic layers on both sides of a base cloth such as plain woven cloth, and a binding string 6 is attached to the tip end thereof.

A cylindrical body 7 having the same material and structure as the cylindrical body 3 described above is provided on the outside of the discharge tube 5, and the base of this cylindrical body 7 is welded to the bottom of the container main body 1. Further, a protective cover 8 is further provided on the outside of the cylindrical body 7.

According to this embodiment, after folding the discharge pipe 5 toward the discharge port 2 side of the container body 1, the tip of the cylindrical body 7 is fastened with a clip, thereby completely preventing the inside of the container body 1 from outside air. can be shut off.

The above description has been made regarding the discharge tube, but since the filling tube connected to the top of the container main body 1 has the same structure as the discharge tube, illustration and explanation thereof will be omitted.

The present invention is as described above, and the cylindrical body connected to the filling or discharging port is made of an airtight flexible sheet, and the part to be clipped has a step on the inside of the joint part. Since the container has a structure in which the back surfaces overlap each other, it has the advantage of being able to be tightly fastened with clips to ensure a complete seal, making it extremely effective as a flexible container that can protect the stored items.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention. Fig. 1 is a partially cutaway front view, Fig. 2 is a front cross-sectional view of the main body of the container, and Fig. 3 shows the opening of the cylindrical body. Partially cut away perspective view, 4th
The figure is a perspective view for explaining the manufacturing state of the cylindrical body, and FIG. 5 is a partially cutaway front view of another modification. In the figure, 1 is a main body of Concia, 2 is a filling or discharging port, and 3 is a cylindrical body.

Claims (1)

[Scope of utility model registration request] A container body is formed using a sheet with a composite structure in which a plain woven fabric is used as a base fabric, a soft plastic layer is provided on both sides, and an airtight plastic film is provided as an inner layer in the soft plastic layer. The filling or discharging port drilled in one main body is made of an airtight flexible sheet, and the container is attached to the main body by joining the front and back surfaces on the part side, and the back surfaces on the tip side. A flexible container characterized by being made up of a series of cylindrical bodies formed by