JPH0518275Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a packaging bag made of synthetic resin film that is used to house an article and seal the package by suctioning and deaerating the internal air. The purpose of the present invention is to provide a packaging bag which can be sealed by heat welding at the opening of the bag and which can be easily vacuum packed by providing a check valve ventilation pipe at the adhesive edge where the film constituting the bag wall is heat welded. It is something to do.

[Conventional technology]

Food, textile products, mechanical parts, and other items are stored in a bag made of synthetic resin film that has gas barrier and heat-welding properties, and the air inside the bag is sucked and degassed, and the bag opening is heat-pressed and vacuum sealed. In order to prevent deterioration of the stored items, packaging them, or even enclosing oxygen absorbers, rust preventives, desiccants, insecticides and sterilizers, etc., or filling vacuum packaging bags with inert gas, etc. Measures for preventive conservation have traditionally been very common.

[The problem that the idea aims to solve]

The bag made of synthetic resin film used for the vacuum packaging described above has a large opening for inserting the article, and after storing the article, the air inside the bag is sucked and degassed through the opening, and the bag wall film is wrapped around the article. A means for sealing the opening edge by thermocompression while in close contact with the surface is adopted, and therefore, it has a suction nozzle that meets the bag opening conditions and a thermocompression sealing member that cooperates with the suction nozzle. Vacuum packaging machines are used, but they are mechanically complex and expensive, and are difficult to adapt to variations in the dimensional conditions of the stored articles, making them difficult to adopt for small-scale production or household use.

[Means to solve the problem]

In order to solve the above-mentioned problems of the conventional vacuum packaging means, the present invention has been developed to improve the structure of the bag wall so that the air inside the bag can be easily degassed after the opening edge of the packaging bag for inserting an article is sealed by thermocompression. By providing a check valve ventilation pipe in the part, a packaging bag that can be easily vacuum packed using a household iron or a vacuum cleaner is obtained.
In this case, the check valve ventilation pipe has a structure that can prevent the deterioration of the non-return sealing effect even if the bag wall is deformed or wrinkled during vacuum packaging, so that a stable vacuum packaging state can be maintained for a long period of time. It is.

That is, the present invention provides a flat bag made of a synthetic resin film having an opening edge for inserting an article that can be sealed by heat welding and a heat-welded adhesive edge, and a part of the adhesive edge of the flat bag between opposing films. It consists of a check valve ventilation pipe that communicates between the inside and outside of a flat bag that is inserted into the bag and whose outer surface is airtightly heat-bonded. a flat cylindrical body with heat-welded edges on both sides, the both sides of which are adhered to the heat-welded edges within a ventilation passage between the open end protruding into the flat bag and the welded portion of the flat bag; A first film valve body whose rear edge opposite to the open end is adhered to one synthetic resin film surface and whose front edge near the open end is a free end, and a ventilation path from the first film valve body. A second film valve body is provided, which is shifted in position in the direction, and has both sides adhered to the heat-welded edges, its trailing edge adhered to the other synthetic resin film surface, and its leading edge serving as a free end. The gist of the present invention is a vacuum packaging bag equipped with a check valve and ventilation pipe.

In the above, the flat bag is made of a single film of a heat-fusible synthetic resin such as polyethylene, polyvinyl chloride, or ethylene-vinyl acetate copolymer resin, or a film of these heat-fusible synthetic resins with heat resistance, strength, etc.
Bags are made using a multilayer film laminated with nylon, which has excellent gas barrier properties, and synthetic resin films such as polyvinylidene chloride.The bag making method involves stacking two square films on three sides. Can be heat-sealed and sealed by known means such as using the edges as an adhesive edge, or folding a rectangular film and using its two edges as an adhesive edge, or using one open edge of a tubular film as an adhesive edge. A flat bag having an opening edge for inserting articles can be obtained.

The check valve ventilation pipe was developed by one of the inventors jointly with another inventor, and was previously filed in 1986.
It has the same structure as the non-return film valve of No. 174869 (see Utility Model Application Publication No. 174869-85770),
When two rectangular films made of heat-fusible synthetic resin such as polyethylene are overlapped and heat-welded on both longitudinal sides to form a flat cylindrical body, the width of the rectangular film is preliminarily applied to an area close to the short side of one of the rectangular films. A rectangular piece of a heat-fusible film such as polyethylene film having the same width as the first film valve body is overlapped with the rectangular film, and the edge farthest from the short edge of the rectangular film is glued.
On the opposing surface of the other rectangular film that is superimposed on this, a rectangular piece similar to the above, which will become the second film valve, is glued with its rear edge at a position that is not overlapped with the rectangular piece that will become the first film valve. And part 2
A rectangular film is placed between two rectangular films, and the edges of both sides of the two rectangular films are heat-welded and adhered at the same time to both longitudinal sides of the rectangular film. Two film valve bodies each having a front edge of a square piece serving as a free end toward one open end of the valve body are spaced apart from each other in a flat cylindrical body to form a check valve ventilation pipe. .

The above-mentioned check valve vent pipe is inserted between opposing films of a part of the adhesive edge of the flat bag body, and its outer surface is heat-welded airtightly. In order to prevent the air passages from being sealed, it is necessary to previously form a coating layer of, for example, cellulose-based paint, which inhibits thermal welding, on one side of the rectangular film facing each other.

This check valve ventilation pipe must have a flat ventilation path width and length that can form an opening cross section through which an intake nozzle such as a vacuum cleaner can be easily inserted into the internal ventilation path. It is.

[Effect]

The vacuum packaging bag with a check valve vent pipe of the present invention having the above-mentioned structure stores an article in the flat bag body, and then heat-pressure seals the opening edge for inserting the article with an iron or the like. Later, by inserting an air supply nozzle such as a vacuum cleaner into the ventilation path of the check valve ventilation pipe to evacuate the internal air, the bag wall film is moved inside the bag while the internal atmospheric pressure and external pressure are balanced. The bag wall is brought into close contact with the outer surface of the stored item, and as degassing continues, the internal atmosphere becomes depressurized, and the differential pressure of the air pressure becomes compressive pressure, compressing the item. If the article is compressively deformed elastically, its volume will be reduced and the internal atmosphere will be in a reduced pressure state according to the suction pressure.At this point, by pulling out the suction nozzle, the check valve can be opened. At the part of the trachea that protrudes into the bag, the bag wall film compresses the flat air passageway due to the external pressure, creating a sufficient sealing effect, especially in the part where the first and second film valve bodies are interposed inside. This prevents outside air from entering.

Vacuum packaging bags containing the above-mentioned items may have irregularly deformed parts such as wrinkles or folds on the bag wall film surface depending on the shape of the item, so partial deformation of the check valve ventilation pipe should also be avoided. However, this can be sufficiently prevented by arranging the two film valve bodies separately.

In addition, the vacuum packaging bag with a check valve vent pipe of the present invention can also be used for packaging filled with inert gas, and in this case, after performing the vacuum packaging method described above, By inserting the gas injection nozzle and pulling out the injection nozzle to create an inert gas pressurized atmosphere inside the bag, the gas pressure inside the bag compresses the portion of the check valve vent pipe that exists inside the bag, creating a sealing effect. Even if the internal gas enters the vent pipe, the first and second film valve bodies alternately adhere to the wall of the other vent passage, creating a flow prevention effect and preventing the gas from flowing out. It can completely prevent leakage.

〔Example〕

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

Figure 1 is a partially cutaway plan view of the bag wall film, Figure 2 is an enlarged plan view of the bag wall film where the check valve vent pipe is attached, and Figure 3 is the reverse of Figure 2. FIG. 2 is an enlarged cross-sectional view of a main part of the stop valve ventilation pipe.

In the drawing, A is a flat bag, in which two heat-adhesive synthetic resin films 11 and 12 are superimposed and three peripheral edges are welded under heat and pressure to form an adhesive edge 2, and one edge is an opening edge 1. This is what I did.

B is a check valve ventilation pipe made of a synthetic resin film made of the same material as above, and the inside is made by overlapping two rectangular synthetic resin films 21 and 22 with heat-welded edges 23 and 24 on both longitudinal sides. A flat cylindrical body is used as a ventilation passage 31, and inside the ventilation passage 31 in a range close to one opening end 30, both sides are adhered to the heat-welded edges 23, 24, and a rear part on the opposite side of the opening end 30 is attached. A first film valve body 40 whose edge 41 is bonded to one side of the synthetic resin film 22 and whose front edge 42 near the opening end 30 is a free end; Shift your position,
A second film valve body 50 is formed, with both sides adhered to the heat-welded edges 23 and 24, a trailing edge 51 adhered to the surface of the other synthetic resin film 21, and a leading edge serving as a free end. It is something that

This check valve ventilation pipe B is interposed between the overlapping edges of the synthetic resin films 11 and 12 during bag making of the flat bag body A, and forms a bonded portion 20 at the same time as the bonded edge 2. At this time, the area on the open end 30 side of the check valve ventilation pipe B having the first and second film valve bodies 40 and 50 is inside the flat bag body A, and the other open end 31 The product of the present invention can be obtained in a state in which the parts protrude outward.

In addition, 35 is an adhesion inhibitor coated on the inner surface of one synthetic resin film 21 so that the ventilation path 32 is maintained by heat pressure when forming the adhesive part 20 on the bag wall of the check valve ventilation pipe B. This is the agent layer.

This vacuum packaging bag with a check valve ventilation pipe can easily vacuum pack an article due to the above-mentioned function, and when taking out the stored article, the heat-welded opening edge 1 is cut off, but the remaining bag is removed. The body can be used as a vacuum packaging bag again.

FIG. 4 is a plan view showing another embodiment, in which a flat bag A is formed by folding a rectangular synthetic resin film at the edges 3.
A check valve ventilation pipe B is provided at a position close to the bent edge 3 of one of the adhesive edges 2, and the opposite edge of the bent edge 3 is an open edge 1. FIG. 5 is a plan view showing still another embodiment, in which a synthetic resin film tube is compressed by forming fold lines 4 on the tube wall film,
A check valve ventilation pipe B is inserted into one opening edge to form an adhesive edge 2, and the opposite edge is an opening edge 1. In both cases, vacuum packaging is carried out in the same way as in the previous embodiment. It is something that can be done.

[Effects of the invention] As mentioned above, the vacuum packaging bag with a check valve vent pipe of the present invention has the opening edge for inserting an article and the mounting position of the check valve vent pipe separated from each other, so that the opening after containing the article The edges can be easily and reliably sealed, the air inside the bag under which goods are stored can be easily expelled, and the ventilation pipe can be stably sealed, and its structure It also has excellent practical effects, such as being simple and easy to manufacture.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway plan view, FIG. 2 is an enlarged plan view with a partially cutaway portion of the check valve vent pipe attachment part, and FIG. 3 is a partially cutaway plan view. FIG. 2 is an enlarged side view of the main part taken along the line, and FIGS. 4 and 5 are plan views showing different embodiments. A...Flat bag body, B...Check valve ventilation pipe, 1...
Opening edge, 2... Adhesive edge, 3... Folded edge, 4... Folded edge, 11, 12... Synthetic resin film, 20...
... Adhesive part, 21, 22 ... Synthetic resin film, 2
3, 24... heat welded edge, 30, 31... open end,
32...Air passage, 40...First film valve body,
41... Trailing edge, 42... Leading edge, 50... Second film valve body, 51... Trailing edge, 52... Leading edge.

Claims (1)

[Scope of utility model registration request] A flat bag body A made of a synthetic resin film having an opening edge 1 for inserting an article that can be sealed by heat welding and a heat welded adhesive edge 2, and a part of the facing film of the adhesive edge 2 of the flat bag body A. It consists of a check valve ventilation pipe B that communicates between the inside and outside of the flat bag body A, which is inserted and whose outer surface is heat-welded airtightly, and the check valve ventilation pipe B is made of two rectangular synthetic resin films 21 and 22. It is a flat cylindrical body with heat-welded edges 23 and 24 on both longitudinal sides, and an open end 30 protruding into the flat bag body A.
and the adhesive part 20 of the flat bag body A, both sides are adhered to the heat-welded edges 23 and 24,
A first film valve body 40 whose rear edge 41 on the opposite side of the open end 30 is adhered to one synthetic resin film 22 surface, and whose front edge 42 near the open end 30 is a free end, and the first film. The position is shifted from the valve body 40 in the direction of the air passage, and the heat welded edges 23,
24, the rear edge 51 is adhered to the other synthetic resin film 21 surface, and the front edge 52 is a free end. Vacuum packaging bag with stop valve ventilation tube.