US20030037519A1

US20030037519A1 - Bag for vacuum sealing with a suction nozzle, suction nozzle and bag for vacuum sealing

Info

Publication number: US20030037519A1
Application number: US10/216,181
Authority: US
Inventors: Akira Ishizaki
Original assignee: Ishizaki Shizai Co Ltd
Current assignee: Ishizaki Shizai Co Ltd
Priority date: 2001-08-27
Filing date: 2002-08-12
Publication date: 2003-02-27
Also published as: CN1401290A; KR20030019087A; JP2003072855A

Abstract

A bag for vacuum sealing from which air is sucked up by a suction nozzle which is connected to a suction pipe or a suction horse of a vacuum cleaner. This bag has a small bag for air suction, and the suction nozzle is inserted in this small bag. The small bag is made of two resin films and is opened and closed by a zipper composed of a protrusion and a groove. The suction nozzle has a rear connecting portion with a check valve inside and a front portion with a suction hole, and the rear portion is to be connected to a vacuum cleaner. The rear connecting portion stands upward. The front portion is spatular and has a suction hole which opens downward. The outer circumference of the front portion where the suction hole is provided is almost equal to the inner circumference of the portion of the small bag where the suction nozzle is inserted.

Description

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a bag for vacuum sealing which is used for vacuum packaging of bedding, voluminous clothing or the like, a suction nozzle which is to be connected to a vacuum cleaner or the like to suck air from the interior of the bag and a combination of the bag and the suction nozzle.

2. Description of the Related Art

Various kinds of bags for vacuum sealing with resin check valves for containing bedding, voluminous clothing or the like have been provided. In the meantime, suction nozzles have been provided as attachments to the bags. Such a suction nozzle is connected to a vacuum cleaner or the like and inserted into the check valve of the bag, and when the vacuum cleaner is turned on, air is extracted from the interior of the bag.

Such a conventional bag for vacuum sealing has a disadvantage that because the check valve, which is made of resin and accordingly is hard, sticks out of the bag body, the check valve is an obstacle, and when a number of such bags are stacked, the check valve may cause a damage to other bags.

There is also a problem in the combination of the bag and the suction nozzle. When the vacuum cleaner stops, air flows backward from the pipe or horse of the vacuum cleaner to the bag. In order to avoid this trouble, the user tries to take the suction nozzle out of the check valve of the bag while operating the vacuum cleaner; at this time, however, a suction hole at the tip of of the suction nozzle comes in contact with the check valve and/or the bag and suck these up. Moreover, it is likely that the suction nozzle may come off the vacuum cleaner when the suction nozzle is taken out of the check valve. Further, because a gap is made between the tip of the suction nozzle and the check valve, air may be flow backward into the bag through this gap.

SUMMARY OF THE INVENTION

An object of the present invention is to provide a bag for vacuum sealing which is provided with a suction nozzle which securely prevents a backward flow of air into the bag.

Another object of the present invention is to provide a bag for vacuum sealing which securely prevents an air flow thereto.

Another object of the present invention is to provide a bag for vacuum sealing which is provided with a small bag for air suction which can be closed securely and easily.

Another object of the present invention is to provide a bag for vacuum sealing which is provided with a small bag for air suction, in which a connecting portion between the bag and the small bag can be formed easily.

Another object of the present invention is to provide a suction nozzle which does not easily come off from a sucking device such as a vacuum cleaner.

Another object of the present invention is to provide a suction nozzle which securely prevents a backward flow of air.

Another object of the present invention is to provide a suction nozzle which prevents a backward flow of air into a bag for vacuum sealing when the suction nozzle is taken out of the bag after the completion of a sucking operation.

Another object of the present invention is to provide a suction nozzle which is easy to handle.

In order to attain the objects, according to a first aspect of the present invention, a bag for vacuum sealing provided with a suction nozzle comprises: a bag comprising: a bag body which is made of a first resin film with a hole in a part, and a small bag for air suction which is made of a second resin film, which is fused with an inner surface of the first resin film of the bag body at the position where the hole is made in the first resin film, which has a connecting portion for connecting the hole to an interior of the bag body and which has a zipper comprising a protrusion and a groove; and a suction nozzle which comprises a rear portion which is to be connected to a vacuum sucking device, and a front portion which has a suction hole and which can be inserted in the small bag for air suction, wherein a backward flow preventive is provided in the suction nozzle, the backward flow preventive permitting an air flow from the suction hole to the rear portion while preventing an air flow from the rear portion to the suction hole.

Because the backward flow preventive provided in the suction nozzle prevents a backward flow of air and because the small bag in which the suction nozzle is inserted is provided with a zipper composed of a protrusion and a groove, by closing the zipper after taking the suction nozzle out of the small bag, an air flow into the bag can be securely prevented.

If an indication which indicates the position and the direction where the suction nozzle is inserted is printed on the small bag for air suction, the convenience will be improved.

According to a second aspect of the present invention; a bag for vacuum sealing comprises: a bag body which is made of a first resin film with a hole in a part; and a small bag for air suction which is made of a second resin film, which is fused with an inner surface of the first resin film of the bag body at the position where the hole is made in the first resin film, which has a connecting portion for connecting the hole to an interior of the bag body and which has a zipper comprising a protrusion and a groove.

In the bag for vacuum sealing, because of the zipper, an air flow into the bag after air suction can be securely prevented. The zipper is preferably not more than 100 mm long. In this case, the zipper never winds, and the user can securely engage the protrusion and the groove with each other from one end to the other end merely by pushing the center of the zipper.

The hole of the bag body may be made by making a slit in the first resin film to form a door. Making a slit is a simple process which does not cause any rubbish. Also, by making a slit to form a door in the small bag for air suction and by fusing this door of the small bag with the door of the bag body, it is possible to open and close these doors together.

The connecting portion of the small bag for air suction can be formed by carrying out a fusion preventing treatment toward the second resin film. The small bag for air suction is fused with the first resin film of the bag body, and in order to prevent the connecting portion of the small bag from fusing with the first resin film at this time, the fusion preventing treatment is carried out on this portion.

A third aspect of the present invention provides a suction nozzle which is to be inserted in a small bag for air suction provided in a bag for vacuum sealing while being connected to a vacuum sucking device so as to suck air from the bag for vacuum sealing, and the suction nozzle comprises: a rear portion which is to be connected to a vacuum sucking device, and a front portion which has a suction hole and which can be inserted in the small bag for air suction, wherein a backward flow preventive is provided in the suction nozzle, the backward flow preventive permitting an air flow from the suction hole to the rear portion while preventing an air flow from the rear portion to the suction hole.

In the suction nozzle, a backward flow of air can be securely prevented by the backward flow preventive. In the suction nozzle, the rear portion preferably stands upward at an angle of not less than 20 degrees. For example, after the suction nozzle was used while being connected to a suction pipe or a suction horse of a vacuum cleaner, when a force is applied in a direction to take the suction nozzle out of the small bag for air suction, the nozzle take-out direction is not parallel to the direction of a force to disconnect the rear portion of the suction nozzle from the suction pipe or the suction horse, and the suction nozzle is not detached from the suction pipe or the suction horse easily.

The suction nozzle may have a flange around the circumference of the rear portion. When the rear portion is inserted in a horse or a pipe of a vacuum cleaner, the edge of the horse or pipe is pushed against the flange tightly, and excess air suction can be prevented.

In the suction nozzle, also, the outer circumference of the front portion where the suction hole is made is preferably almost equal to the inner circumference of the portion of the small bag for air suction with a minimum width. In this case, when the suction nozzle is pulled out of the small bag after the completion of air suction, there is almost no space between the front portion of the nozzle and the inner surface of the small bag, and a backward flow of air from this portion can be minimized.

Further, the front portion of the suction nozzle is preferably spatular so that the small bag for air suction can be maintained planar. In this case, when the spatular front portion is pulled out of the bag for vacuum sealing while being nipped between the outer resin film of the bag for vacuum sealing and the item contained in the bag, the small bag can be maintained planar, and it is less likely that air flows back in the bag through the space in the resin film of the small bag.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other objects and features of the present invention will be apparent from the following description with reference to the accompanying drawings, in which: [0027]
FIGS. 1[0028] a and 1 b show a first embodiment of a bag for vacuum sealing according to the present invention, FIG. 1a being a plan view and FIG. 1b being a section view;
FIGS. 2[0029] a and 2 b show an exemplary small bag for air suction which is provided in the bag for vacuum sealing of the first embodiment, FIG. 2a being a plan view and FIG. 2b being a sectional view;
FIG. 3 is a sectional view of a zipper provided in the small bag for air suction; [0030]
FIGS. 4[0031] a and 4 b show a second embodiment of a bag for vacuum sealing according to the present invention, FIG. 4a being a plan view and FIG. 4b being a sectional view;
FIGS. 5[0032] a and 5 b show a second exemplary small bag for air suction which is provided in the bag for vacuum sealing of the second embodiment, FIG. 5a being a plan view and FIG. 5b being a sectional view;
FIGS. 6[0033] a, 6 b and 6 c show a first embodiment of a suction nozzle according to the present invention, FIG. 6a being a front view, FIG. 6b being a bottom view and FIG. 6c being a side view;
FIGS. 7[0034] a, 7 b and 7 c show segments of the suction nozzle shown by FIGS. 6a, 6 b and 6 c, FIG. 7a being a front view, FIG. 7b being a bottom view and FIG. 7c being a sectional view cut along the line A-A;
FIGS. 8[0035] a and 8 b show a check valve provided in the suction nozzle shown by FIGS. 6a, 6 b and 6 c, FIG. 8a being a plan view and FIG. 8b being a side view;
FIG. 9 is an illustration which shows the usage of the suction nozzle shown by FIGS. 6[0036] a, 6 b and 6 c;
FIGS. 10[0037] a and 10 b show a second embodiment of a suction nozzle according to the present invention, FIG. 10a being a perspective view seen from below and FIG. 10b being a perspective view seen from above;
FIGS. 11[0038] a, 11 b and 11 c show a third embodiment of a suction nozzle according to the present invention, FIG. 11a being a plan view, FIG, 11 b being a front view and FIG. 11c being a bottom view;
FIG. 12 is a side view of the suction nozzle shown by FIGS. 11[0039] a, 11 b and 11 c;
FIG. 13 is a sectional view of the suction nozzle shown by FIG. 11[0040] c cut along the line G-G;
FIGS. 14[0041] a and 14 b are sectional views of segments of the suction nozzle shown by FIGS. 11a, 11 b and 11 c;
FIGS. 15[0042] a and 15 b are front views of the segments shown by FIGS. 14a and 14 b;
FIG. 16 is a sectional view of a connecting portion of the suction nozzle shown by FIGS. 11[0043] a, 11 b and 11 c; and
FIGS. 17[0044] a and 17 b show a check valve provided in the suction nozzle shown by FIGS. 11a, 11 b and 11 c, FIG. 17a being a plan view and FIG. 17b being a side view.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Some embodiments of a bag for vacuum sealing provided with a suction nozzle, a suction nozzle and a bag for vacuum sealing will be described with reference to the accompanying drawings. [0045]

First Embodiment of Bag for Vacuum Sealing and First Example of Small Bag; See FIG. 1 Through FIG. 3

First, a first embodiment of a bag for vacuum sealing is described. FIG. 1 shows a bag [0046] 1A for vacuum sealing which is used to contain bedding, clothing or the like. This bag 1A is made of a front outer resin film 2 and a back outer resin film 3, and the bag 1A has three sealed sides (upper side, lower side and left side which are hatched in FIG. 1a). The right side in FIG. 1a is an opening 4, and at this opening 4, a conventional zipper 5 composed of a protrusion and a groove is provided.
Further, a [0047] slider 8 may be provided at the opening 4 so as to facilitate the closing of the zipper 5.
The bag [0048] 1A incorporates a small bag 10A for air suction from the interior of the bag 1A. This small bag 10A is located on the inner surface of the resin film 2 at a portion where an hole 6 is made.
As FIGS. 2[0049] a and 2 b show, the small bag 10A is formed of two resin films 11 and 12. In FIG. 2a, the outer resin film 2 of the bag 1A is not shown, and in FIG. 2b, for simplification, hatching is not made. The hatched portions in FIG. 2a are fused portions.
The [0050] resin films 11 and 12 forming the small bag 10A are fused together at both sides (the fused portions a and b shown by right-upward to left-downward hatching) and also fused with the inner surface of the outer resin film 2 (at the fused portions c, d, e and f shown by left-upward to right-downward hatching) so that air will never leak from the small bag 10A. A treatment for preventing the resin films 11 and 12 from fusing with each other is carried out at the portion e so that a connecting portion 13 between the exterior and the interior can be formed. The fusion preventing treatment can be realized easily by providing a fusion preventive layer 14 on the inner surface of the resin film 11 (or on the inner surface of the resin film 12). The fusion preventive layer 14 may be made of various materials. For example, photogravure of heat resist ink is preferred.
Another example of carrying out a fusion preventing treatment is to use a laminate film as the [0051] resin film 11 of the small bag 10A. More specifically, a laminate film which is composed of an outer film with a low fusing temperature and an inner film with a high fusing temperature is used as the resin film 11. Then, by applying a temperature which permits fusion of the outer film with the portion e but does not permit fusion of the inner film with the resin film 12, the resin films 11 and 12 do not fuse with each other at the portion e, whereby the connecting portion 13 can be formed.
A [0052] zipper 15 which comprises a protrusion and a groove is provided at a position which is an edge of the resin film 11 and a middle of the resin film 12. This zipper 15 is to ensure the airtightness of the bag 1A. As FIG. 3 shows, the zipper 15 is a conventional type which is composed of bases 16, a protrusion 17 and a groove 18, the portions 16, 17 and 18 being made integrally by extrusion molding. The zipper 5 provided in the bag 1A is also of the same type.
As the [0053] zipper 15, various types of zippers of which protrusions 17 and frooves 18 are modified in various ways, including a double type, are usable as long as they permit easy open of the hole 6 and have high sealing performance.
Further, on the surface of the [0054] resin film 12, an arrow which shows the position and direction where a suction nozzle 20A, 20B or 20C, which will be described later, is inserted is printed.

Second Embodiment of Bag for Vacuum Sealing and Second Example of Small Bag; See FIGS. 4 and 5

A second embodiment of a bag for vacuum sealing is described. As FIG. 4 shows, this [0055] bag 1B is basically of the same structure as the bag 1A. In FIG. 4, the same parts and members are provided with the same reference numerals as in FIG. 1, and description of these parts and members is omitted. This bag 1B has a slit 7 a instead of the hole 6 made in the outer resin film 2. Due to this slit 7 a, a small door 7 is formed, and behind the door 7, a small bag 10B for air suction from the interior of the bag 1B is provided.
Now, referring to FIG. 5, the structure of the [0056] small bag 10B, which is a second exemplary small bag for air suction, is described. The small bag 10B is formed by fusing two resin films 11 and 12 of identical dimensions with each other at portions a, b and c, and the small bag 10B is fused with the outer resin film 2 of the bag 1B at portions d, e, f and g so that air will not flow back into the bag 1B.
FIGS. 5[0057] a and 5 b correspond to FIGS. 2a and 2 b, respectively, in view of the method of drawing. A slit 17 a is made in the resin film 11 in such a way that the slit 17 a is located inside along the slit 7 a, and thereby, a small door 17 is formed. The small door 17 and the small door 7 of the bag 1B are fused together at a portion h, so that these doors 17 and 7 can be opened and closed together.
At the portions e and h, further, a fusion preventing treatment is carried out, and more specifically, a fusion [0058] preventive layer 14 is provided on the inner surface of the resin film 11 (or on the inner surface of the resin film 12) at the portions e and h so that a connecting portion 13 between the exterior and the interior of the bag 1B can be formed. Further, a zipper 15 which is of the type shown in FIG. 3 is provided on the resin films 11 and 12 so as to maintain the air tightness of the connecting portion 13.

First Embodiment of Suction Nozzle; See FIGS. 6 Through 8

Now, a first embodiment of a suction nozzle according to the present invention is described. FIG. 6 shows the [0059] suction nozzle 20A. The suction nozzle 20A has, in the rear, a connecting portion 21 with a circular section, and this connecting portion 21 is to be inserted in a suction pipe or a suction horse of a vacuum cleaner. The suction nozzle 20A also has, in the front, a flat pipe with a suction hole 22 at an end. The connecting portion 21 stands upward at an angle θ of approximately 70 degrees.
The front end portion including the [0060] suction hole 22 is spatular and has another hole 25. This hole 25 permits the suction nozzle 20A to be hooked when it is unused. The front end portion also has a small ball section 26. This ball section 26 is, as will be described in detail later, to permit the suction nozzle 20A to come across the convex portion of the zipper 15 easily when the nozzle 20A is inserted in the small bag 10A or 10B.
The [0061] suction nozzle 20A is made of an appropriate plastic material. As FIG. 7b shows, two (right and left) segments of the suction nozzle 20A are made separately by injection molding. Then, convexities and concavities formed on the joint surfaces are engaged with each other, and the two segments are joined together.
In the connecting [0062] portion 21, a check valve 27 made of a resin film shown by FIGS. 8a and 8 b is fitted. The check valve 27 is placed on a valve seat 21 a shown in FIG. 7c in such a way that the hatched portion of the check valve 27 (see FIG. 8) is bonded to the hatched portion of the valve seat 21 a (see FIG. 7c) and that the non-bonded portion (valve flap 27 a) of the valve 27 movably rests on the valve seat 21 a. The valve flap 27 a is pivotable only in the direction of arrow x shown in FIG. 8b, and the valve 27 permits an air flow in the direction of arrow C shown in FIG. 7a while preventing an air flow in the reverse direction. Further, in order to prevent the check valve 27 from coming off the valve seat 21 a due to open/close motions thereof, cutouts 27 b are formed on both sides of the axis of pivot of the valve flap 27 a.
In the front end portion of the [0063] suction nozzle 20A, the circumference of the portion with the maximum width (the portion shown by dashed line Y in FIG. 6b) is almost equal to the minimum inner circumference of the connecting portion 13 of the small bag 10A or 10B (the dimension D of the unfused portion shown in FIGS. 2a and 5 a). Also, the circumference of the pipe portion shown by the dashed line Y′ in FIG. 6b is almost equal to the minimum inner circumference of the connecting portion 13.

Usage; See FIG. 9

Now, referring to FIG. 9, a way of extracting air from the interior of the [0064] bag 1B by use of the suction nozzle 20A is described. Further, the usage of suction nozzles 20B and 20C which will be described later is basically the same as that of the suction nozzle 20A. It is to be noted that the way of using the suction nozzle 20A described herewith is merely an example.
First, the connecting [0065] portion 21 of the suction nozzle 20A is connected to a suction pipe or a suction horse of a vacuum cleaner. The small door 7 of the bag 1B is pulled up, and simultaneously the small door 17 of the small bag 10B is also pulled up. Then, the zipper 15 is opened by applying a force to separate the resin films 11 and 12 from each other, and thereby, a hole is formed. The front end portion of the suction nozzle 20A is inserted in this hole, and at this time, the round front end of the suction nozzle 20A can come across the zipper 15 smoothly.
The [0066] suction nozzle 20A is inserted further inside the bag 1B through the small bag 10B, and when the vacuum cleaner is turned on, air is sucked from the interior of the bag 1B. When the vacuum cleaner is stopped after completion of the air suction, the check valve 27 provided in the suction nozzle 20A prevents air from flowing backward from the vacuum cleaner.
After the air suction, when the [0067] suction nozzle 20A is pulled out of the bag 1B, the spatular front end portion of the suction nozzle 20A flattens the resin films 11 and 12 of the small bag 10B, and no space is formed between the resin films 11 and 12 because the resin films 11 and 12 are nipped between the item contained in the bag 1B and the outer resin film 2. Also, since the circumferential surface of the front end portion of the suction nozzle 20A sticks to the inner surface of the small bag 10B, almost no gap is formed between the front end portion of the suction nozzle 20A and the small bag 10B. Thus, when the nozzle 20A is pulled out of the small bag 10B, a backward flow of air around the circumferential surface of the nozzle 20A can be securely prevented.
After the [0068] nozzle 20A is pulled out of the small bag 10B, the user can engage and close the zipper 15 merely by pushing it. For easy engagement of the zipper 15, preferably, the zipper 15 is not more than 100 mm long. If the zipper 15 is too long, the protrusion 17 and the groove 18 will wind, and the user must push the zipper 15 with his/her finger sliding from one end to the other end so as to securely engage the protrusion 17 and the groove 18 with each other. If the zipper 15 is short, the protrusion 17 and the groove 18 can stay straight, and the user can engage the protrusion 17 and the groove 18 with each other merely by pushing from above.
When the [0069] suction nozzle 20A is pulled out of the small bag 10B, a force is applied in the direction of arrow Z shown in FIG. 6a. The direction of a force to disconnect the suction pipe or horse of the vacuum cleaner from the connecting portion 21 of the nozzle 20A is the direction of arrow Z′. Therefore, with the force in the direction of Z, the connecting portion 21 will never be detached from the vacuum cleaner. If the uprising angle θ of the connecting portion 21 is not less than 20 degrees, this function can be fulfilled.
Further, the [0070] check valve 27 is located in the rear side of the bent portion of the nozzle 20A, that is, above the bent portion. Therefore, the check valve 27 stays in a position to close the nozzle 27 by its own weight, and a backward flow of air can be securely prevented.
Since the [0071] suction hole 22 opens downward to suck air from below, the nozzle 20A will never suck the outer resin film 2 of the bag 1B, troubles such as degradation of sucking performance and stoppage will never occur.

Second Embodiment of Suction Nozzle; See FIG. 10

Next, a second embodiment of a suction nozzle according to the present invention is described. As FIGS. 10[0072] a and 10 b show, the suction nozzle 20B is a box type and has a plurality of suction holes 22 on its front end, bottom and both sides. The structure and the operation of the suction nozzle 20B are basically the same as those of the suction nozzle 20A.
The characteristics of the [0073] suction nozzle 20B are that the front end is rounded off and that a flange 29 is provided between the box-like body and a connecting portion 21. This flange 29 may be of a type which covers the whole circumference or may be composed of some sections separated along the circumference.
More specifically, the rounded-off front end means that the front end is rounded off with respect to the vertical direction as shown by arrow E in FIG. 10[0074] a and/or that the front end is rounded off with respect to the horizontal direction as shown by arrow F in FIG. 10a. The function of the rounded-off front end is, like the small ball section 26 of the suction nozzle 20A, to permit the suction nozzle 20B to come across the zipper 15 smoothly. In the suction nozzle 20B, it is preferred that the front end is rounded off with respect to the vertical direction.
Even if the connecting [0075] portion 21 is inserted in a horse or a pipe with an inner diameter which is larger than the outer diameter of the connecting portion 21, the edge of the horse or pipe is pushed against the flange 29, and the horse or pipe can be connected tightly to the connecting portion 21. Therefore, excess air suction can be prevented.

Third Embodiment of Suction nozzle; See FIGS. 11 Through 17

Next, a third embodiment of a suction nozzle according to the present invention is described. The [0076] suction nozzle 20C basically has the same structure and the same function as those of the suction nozzle 20A. In FIGS. 11a through 17, the same parts and members are provided with the same reference numerals as in FIGS. 6a through 9, and repeated description of these parts and members is omitted.
As FIGS. 112[0077] a, 11 band 11 c show, the suction nozzle 20C has, in the rear, a connecting portion 21 with a circular section which is to be connected to a suction pipe or a suction horse of a vacuum cleaner. The suction nozzle 20C also has, in the front, a flat pipe with a main suction hole 22 and small suction holes 23 and 24. The front end portion including the main suction hole 22 is spatular.
The [0078] suction nozzle 20C is molded of an appropriate plastic material. As FIGS. 14a, 14 b and 15 a, 15 b show, an upper portion and a lower portion are formed separately by injection molding, and these two portions are engaged and bonded together.
As FIG. 16 shows, in the connecting [0079] portion 21, a check valve 28 is provided. As FIG. 17 shows, the check valve 28 is an integral product comprising a semicircular fixed portion 28 a and a valve flap 28 b. The border 28 c between the fixed portion 28 a and the valve flap 28 b is made thinner so that the valve flap 28 b can freely pivot on the thinner portion 28 c.
The fixed portion [0080] 28 a is fitted in a groove 21 b formed in the connecting portion 21, and the valve flap 28 b is movably in contact with the inner surface of the connecting portion 21. In this state, the valve flap 28 b permits an air flow in the direction shown by arrow C while preventing an air flow in the opposite direction.
In the front end portion of the [0081] suction nozzle 20C, the outer circumference of the portion with the maximum width (shown by the dashed line Y in FIG. 11a) is almost equal to the inner circumference of the connecting portion 13 of the small bag 10A or 10B, that is, the dimension D of the unfused portion (shown by FIGS. 2a and 5 a). Also, the circumference of the pipe body shown by the dashed line Y′ in FIG. 11a is almost equal to the inner circumference of the connecting portion 13.
The sucking operation of the [0082] suction nozzle 20C is basically the same as that of the suction nozzle 20A, and in the sucking operation, the suction nozzle 20C brings the same effect as the suction nozzle 20A does.

Other Embodiments

The general proportion of the suction nozzle, the position(s) and the shape(s) of the suction hole(s) and the shape of the check valve can be arbitrarily designed. There may be provided two check valves in two locations. The rear portion of the suction nozzle may be integrally attached to a vacuum sucking device. The small bag for air suction may be located in any position, and not only one small bag but also two or more small bags for air suction may be provided in one bag. [0083]
As a preventive against a backward flow of air, instead of a check valve, an air shield, which can be moved to an opening position and to a closing position in response to an operation of a knob or a button by the user, may be provided in the nozzle. [0084]
Further, the bag for vacuum sealing may be formed by any of various sealing methods, and the zipper provided in the small bag for air suction may be of any type. [0085]
Although the present invention has been described in connection with the preferred embodiments above, it is to be noted that various changes and modifications are possible to those who are skilled in the art. Such changes and modifications are to be understood as being within the scope of the present invention. [0086]

Claims

What is claimed is:

1. A bag for vacuum sealing provided with a suction nozzle, comprising:

a bag comprising:

a bag body which is made of a first resin film with a hole in a part; and

a small bag for air suction which is made of a second resin film, which is fused with an inner surface of the first resin film of the bag body at the position where the hole is made in the first resin film, which has a connecting portion for connecting the hole to an interior of the bag body and which has a zipper comprising a protrusion and a groove; and

a suction nozzle comprising:

a rear portion which is to be connected to a vacuum sucking device; and

a front portion which has a suction hole and which can be inserted in the small bag for air suction;

wherein a backward flow preventive is provided in the suction nozzle, the backward flow preventive permitting an air flow from the suction hole to the rear portion while preventing an air flow from the rear portion to the suction hole.

2. A bag for vacuum sealing provided with a suction nozzle according to claim 1, wherein on the small bag for air suction, an indication which indicates a position and a direction where the suction nozzle is inserted is printed.

3. A bag for vacuum sealing provided with a suction nozzle according to claim 1, wherein an outer circumference of the front portion of the suction nozzle where the suction hole is made is almost equal to an inner circumference of a portion with a minimum width of the small bag for air suction.

4. A bag for vacuum sealing provided with a suction nozzle according to claim 1, wherein the front portion of the suction nozzle where the suction hole is made is spatular so as to flatten the small bag for air suction.

5. A bag for vacuum sealing provided with a suction nozzle according to claim 1, wherein the rear portion of the suction nozzle is to be connected to a vacuum cleaner.

6. A bag for vacuum sealing, comprising:

a bag body which is made of a first resin film with a hole in a part; and

a small bag for air suction which is made of a second resin film, which is fused with an inner surface of the first resin film of the bag body at the position where the hole is made in the first resin film, which has a connecting portion for connecting the hole to an interior of the bag body and which has a zipper comprising a protrusion and a groove.

7. A bag for vacuum sealing according to claim 6, wherein the hole of the bag body is made by making a slit in the first resin film to form a door.

8. A bag for vacuum sealing according to claim 7, wherein:

the small bag for air suction has a door which is formed by making a slit in the second resin film; and

the door of the small bag is fused with the door of the bag body.

9. A bag for vacuum sealing according to claim 6, wherein the connecting portion of the small bag for air suction is formed by carrying out a fusion preventing treatment toward the second resin film.

10. A suction nozzle which is to be inserted in a small bag for air suction provided in a bag for vacuum sealing while being connected to a vacuum sucking device so as to suck air from the bag for vacuum sealing, said suction nozzle comprising:

a rear portion which is to be connected to a vacuum suction device; and

a front portion which has a suction hole and which can be inserted in the small bag for air suction,

11. A suction nozzle according to claim 10, wherein the rear portion stands upward at an angle of not less than 20 degrees.

12. A suction nozzle according to claim 10, wherein a flange is provided so as to wholly cover an outer circumference of the rear portion.

13. A suction nozzle according to claim 10, wherein an outer circumference of the front portion where the suction hole is made is almost equal to an inner circumference of a portion with a minimum width of the small bag for air suction.

14. A suction nozzle according to claim 10, wherein the front portion where the suction hole is made is spatular.

15. A suction nozzle according to claim 10, wherein the rear portion is to be connected to a vacuum cleaner.