JPH01182256A - Sealed bag made of synthetic resin - Google Patents

Abstract

PURPOSE:To maintain sealing efficiency of a packed object in a bag while making the folded part of a doubly folded tube stick tightly to the bag, by arranging a holding piece made of a synthetic resin film on the outer surface of the bag, which is located on the upper surface of the folded part of a tube located outside the bag and presses the tube to the outer surface of the bag. CONSTITUTION:At the butted part between an upper half 5 and a lower half 6 of a synthetic resin film 2, a tube 8 is placed in such a manner that the lower half is placed inside of a bag 1, and the upper half is placed outside of the bag 1. The outer surface of the tube 8 and the inner surface of the butted part have been thermally fusion-welded. The lower half and the upper half of this tube 8 are folded in two; and the tube 8, which is located inside of the bag 1, is partially fusion-welded by heat to the inner surface of a lower half 6 of the plastic film 2 on the outer surface side. In the meantime the tube 8, which is located outside of the bag 1, is pressed by a holding piece 9 to maintain the doubly folded state. Therefore, when a packing object is packed in the bag 1, the bag 1 swells out; and the holding piece 9 presses firmly on the folded part of the tube 8. So the inner surfaces of the tube 8, which is located outside of the bag 1, stick together tightly; and the sealing efficiency of the bag 1 is improved.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a sealed bag made of synthetic resin.

[Conventional technology and its problems] In recent years, sealed bags made of synthetic resins such as polyethylene have been used for transporting liquids such as juice and ink, or for air cushioning.
Widely used for air pillows, water pillows, etc.

Conventionally, in this type of sealed bag, a filling port made of synthetic resin is attached to the bag body, and after filling the bag with liquid or gas through this filling port, the filling port is closed with a camp to close the bag body. It is supposed to be sealed.

However, since the sealed bag with the above structure has a synthetic resin filling port and cap protruding from the bag body, the filling port and cap get in the way when the sealed bag is used as an air cushion or air pillow. There's a problem.

In addition, in the case of a sealed bag with the above structure, it is necessary to fit the camp into the filling port each time after filling with liquid or gas.
There is a problem that workability is poor.

Furthermore, there is also the problem that the filling material leaks from the filling port when the camp is fitted into the filling port.

Therefore, the present invention aims to provide a sealed bag made of synthetic resin that has a structure in which the filling material does not leak from the filling port even if a cap is not fitted to the filling port, and the filling port does not get in the way. .

[Means for solving problems]

The hermetic bag of the present invention has an upper part made by folding in half a tube made of synthetic resin film, which is flatly stacked on top of a bag body formed of a synthetic resin film and having a sealing property, so that the inner surfaces are in close contact with each other. is located outside the bag, and the folded lower part is located inside the bag, and the tube is located on the upper surface side of the folded part of the tube located outside the bag. The present invention is characterized in that a presser piece made of a synthetic resin film is provided on the outer surface of the bag for pressing the tube against the outer surface of the bag.

[Effect]

The tube provided in the bag body is folded in half, and the upper part is located outside the bag body, and the lower part is located inside the bag body, so it is possible to fill the bag body with liquid or gas. In such cases, lift the upper part of the tube located outside the bag so that the tube folded in half is on a straight line, and insert a hose, etc. for supplying liquid or gas into the tube. When supplied, liquid or gas is filled into the bag through the tube.

After this, when the bag is filled with liquid or gas, when the hose inserted into the tube is pulled out and the tube is folded back in half, the internal pressure inside the bag has increased due to the filling. The tubes located inside the bag are stacked flat so that their inner surfaces are in close contact with each other, especially the folded parts that are folded in half, which prevents the material filled inside the bag from leaking outward through the tube. The airtightness is maintained.

Furthermore, a presser piece is provided on the top side of the tube pulled out to the outside of the bag, so when the bag is filled with material, the bag expands, and the presser piece holds the tube inside the bag. It is strongly pressed against the outer surface, and as a result, the inner surface of the tube located on the outside of the bag also comes into close contact, improving the sealing performance of the bag. Moreover, if the tube drawn out of the bag is folded and placed under the presser piece, the bag can be completely sealed.

〔Example〕

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

A first embodiment of the invention is shown in FIGS. 1-4.

The bag 1 is formed by overlapping a rectangular synthetic resin film 2 on the front side and a synthetic resin film 3 on the back side and heat-sealing the peripheral edges thereof. Reference numeral 4 indicates a heat-sealed portion on the periphery. As the material of the synthetic resin films 2.3 on the front side and the back side, for example, polyethylene, vinyl chloride, etc. can be used. Also,
The synthetic resin films 2.3 on the front side and the back side may each be used by overlapping two or more synthetic resin films.

The synthetic resin film 2 on the front side of the bag 1 has an upper half 5
and a lower half 6, and the abutting portions of the upper half 5 and the lower half 6 are heat-sealed to each other so that the ends are located outside the bag 1, leaving a required range of ends. A presser piece 9 for pressing a tube 8, which will be described later, is formed on the end side of the heat-sealed portion 7.

The tube 8 is formed by overlapping two elongated rectangular synthetic resin films and heat-sealing both sides of the films so that the inner surfaces are in close contact with each other. The material of the synthetic resin film forming this tube 8 is the same as that of the bag body 1.

This tube 8 is attached to the synthetic resin film 2 when forming the presser piece 9 on the synthetic resin film 2 on the front side of the bag body 1.
The tube 8 is sandwiched between the abutting portion of the upper half 5 and the lower half 6 so that the lower half of the tube 8 is located inside the bag 1 and the upper half is located outside the bag 1. The outer surface of 8 and the inner surface of the side facing portion are heat fused. The lower half and upper half of this tube 8 are folded in half, and the tube 8 located inside the bag 1 is partially heat-sealed to the inner surface of the lower half 6 of the synthetic resin film 2 on the front side. On the other hand, the tube 8 located on the outside of the bag body 1 is pressed down by a presser piece 9 to maintain the folded state.

For this purpose, both side edges of the presser piece S are heat-sealed to the surface of the synthetic resin film 2 on the front side of the bag body 1, and the presser piece 9 is folded over the surface of the bag body 1.

A core plate 10 is attached to the tip of the tube 8 located outside the bag 1 in order to facilitate folding of the tube 8.

'Next, in the fifth part and FIG. 6, a second embodiment of the present invention is shown.

In the second embodiment, the tube 8 is provided at one side edge of the bag 1, whereas the tube 8 is provided at the center of the bag 1 in the first example.

For this reason, the bag 1 is formed by folding a long rectangular synthetic resin film in half and heat-sealing both side edges and a portion near the top edge. Then, the upper edge of the bag 1 is folded back toward the front side, and the both side edges are heat-sealed to form a presser piece 9.

Since there is no fundamental difference between the first and second embodiments except for the above points, the reference numerals of the second embodiment correspond to those of the first embodiment.

Next, the operation of the sealed bag configured as described above will be explained.

First, when filling the bag 1 with liquid or gas, the tube 8 located outside the bag 1 is raised (raised and the tube 8 folded in half is stretched in a straight line). When a hose or the like for supplying liquid or gas is inserted into this tube 8 and the liquid or gas is supplied, the liquid or gas passes through the tube 8 and is filled into the bag body 1, and the bag body 1 is inflated.

After this, after the filling of liquid or gas is completed, the tube 8
When the hose inserted into the bag body 1 is removed, the tube 8 is removed from the bag body 1.
Since the outer side of the bag body 1 is pressed by the presser piece 9 on the front side of the bag body 1, it returns to the folded state. In this way, when the tube 8 is folded in half, the internal pressure inside the bag 1 is increased due to the filling, so the tubes 8 located in the bag 1 are stacked flat so that their inner surfaces are in close contact with each other. In particular, the folded part that is folded in half is in close contact with each other, so that the filling filled in the bag 1 does not leak outward through the tube 8, and the sealing property is maintained.

Furthermore, since a presser piece 9 is provided on the upper surface side of the tube 8 pulled out to the outside of the bag body 1, when the bag body 1 is filled with the filling material, the bag body 1 expands and the presser piece 9 strongly presses the folded part of the tube 8, and as a result, the inner surface of the tube 8 located on the outside of the bag body 1 also comes into close contact with the bag body 1.
Improves sealing performance. Furthermore, if the tube 8 pulled out to the outside of the bag 1 is folded and placed under the presser piece 9 as shown in FIG. 4, the bag 1 will be completely sealed.

〔Effect of the invention〕

Since the present invention is as described above, it produces the following excellent effects.

That is, the sealed bag of the present invention has a bifold-shaped tube made of synthetic resin film as a filling port, and even after inserting a hose etc. into this tube and filling it with liquid or gas, even if the hose etc. is removed, there is no leakage from the tube. The filling does not leak and maintains a tight seal.

Therefore, the filling does not leak even if the can knob is not fitted into the filling port as in the conventional case, and the filling operation can be performed extremely quickly.

Furthermore, since the filling port is formed of a tube made of synthetic resin, the filling port does not protrude from the outer surface of the bag and does not get in the way.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway side view showing a first embodiment of a sealed bag according to the present invention, FIG. 2 is a perspective view showing the same sealed bag filled with a filler and inflated, and FIG. 2 is a partially cutaway side view of FIG. 2, FIG. 4 is a partial cross-sectional view of the same, showing the tube folded and sandwiched below the presser piece, and FIG. 5 is a second embodiment of the sealed bag according to the present invention. FIG. 6 is a partially cutaway side view showing an example, and FIG. 6 is a plan view of FIG. 5. 1...Bag body, 2.3...Synthetic resin film, 8...
Tube, 9...presser piece. Patent applicant Eiwa Special Processing Co., Ltd. Agent Kama 1) Text 2 Figure 3 Figure 5 Figure 4 Figure 6

Claims (1)

[Claims] A tube made of synthetic resin film is folded in half and stacked on top of a bag made of a synthetic resin film that has airtight properties so that the inner surfaces are in close contact with each other.The upper part of the tube is placed on the outside of the bag. and the folded lower part is located inside the bag,
A presser piece made of synthetic resin film is provided on the outer surface of the bag body, and is located on the upper surface side of the folded part of the tube located on the outside of the bag body, and presses the tube against the outer surface of the bag body. A sealed bag made of synthetic resin.